Digchip : Database on electronics components
Electronics components database



 
Filter:  
  Select journal:
 
  Search word:
 
  Search author:
 

 
Pages: 01234567891011121314151617181920


Electrical and Electronics Engineering publications abstract of: 02-2011 sorted by title, page: 13
» Multichannel High-Bandwidth Coupling of Ultradense Silicon Photonic Waveguide Array to Standard-Pitch Fiber Array
Abstract:
A multichannel tapered coupler interfacing standard 250- m-pitch low-numerical-aperture (NA) polarization-maintaining fiber arrays with ultradense 20- m-pitch high-NA silicon waveguides is designed and fabricated. The coupler is based on an array of 12 dual-core glass waveguides on 250- m pitch that are tapered to a 20- m pitch, simultaneously providing both pitch and spot-size conversion. At the wide end, the inner core matches the NA and mode profile of standard single-mode fiber. When drawn and tapered, the inner core “vanishes” and the outer core, surrounded by the clad, matches the NA and mode profile of the on-chip photonic waveguide. Ultradense high-efficiency coupling to an array of Si photonic waveguides is demonstrated using a 12-channel polarization-maintaining-fiber pigtailed tapered coupler. Coupling to Si waveguides is facilitated using SiON spot-size converters integrated into the Si photonic IC to provide 2-3- m mode field diameters compatible with the tapered coupler. The tapered coupler achieves dB coupling losses to photonic waveguides. Furthermore, eight-channel coupling is shown with less than dB crosstalk between channels. Finally, a 640-Gb/s wavelength-division-multiplexing signal is coupled into four waveguides occupying 80 m of chip edge, providing 160-Gb/s per-channel bandwidths.
Autors: Doany, F. E.;Lee, B. G.;Assefa, S.;Green, W. M. J.;Yang, M.;Schow, C. L.;Jahnes, C. V.;Zhang, S.;Singer, J.;Kopp, V. I.;Kash, J. A.;Vlasov, Y. A.;
Appeared in: Journal of Lightwave Technology
Publication date: Feb 2011, volume: 29, issue:4, pages: 475 - 482
Publisher: IEEE
Full litterature document
 
» Multiconlitron: A General Piecewise Linear Classifier
Abstract:
Based on the “convexly separable” concept, we present a solid geometric theory and a new general framework to design piecewise linear classifiers for two arbitrarily complicated nonintersecting classes by using a “multiconlitron,” which is a union of multiple conlitrons that comprise a set of hyperplanes or linear functions surrounding a convex region for separating two convexly separable datasets. We propose a new iterative algorithm called the cross distance minimization algorithm (CDMA) to compute hard margin non-kernel support vector machines (SVMs) via the nearest point pair between two convex polytopes. Using CDMA, we derive two new algorithms, i.e., the support conlitron algorithm (SCA) and the support multiconlitron algorithm (SMA) to construct support conlitrons and support multiconlitrons, respectively, which are unique and can separate two classes by a maximum margin as in an SVM. Comparative experiments show that SMA can outperform linear SVM on many of the selected databases and provide similar results to radial basis function SVM on some of them, while SCA performs better than linear SVM on three out of four applicable databases. Other experiments show that SMA and SCA may be further improved to draw more potential in the new research direction of piecewise linear learning.
Autors: Yujian, L.;Bo, L.;Xinwu, Y.;Yaozong, F.;Houjun, L.;
Appeared in: IEEE Transactions on Neural Networks
Publication date: Feb 2011, volume: 22, issue:2, pages: 276 - 289
Publisher: IEEE
Full litterature document
 
» Multicore Desktop Programming with Intel Threading Building Blocks
Abstract:
The paper mentions that the Intel Threading Building Blocks is a key component of Intel Parallel Building Blocks. This widely used C++ template library helps developers achieve well-performing modular parallel programs in multiprogrammed environments.
Autors: Wooyoung Kim;Voss, M.;
Appeared in: IEEE Software
Publication date: Feb 2011, volume: 28, issue:1, pages: 23 - 31
Publisher: IEEE
Full litterature document
 
» Multicriteria Optimal Winding Scheme in HTS Transformers by Analytical Hierarchy Process
Abstract:
When designing high-temperature superconducting transformers, leakage magnetic field, ac loss, circulating current, and electromagnetic forces are important issues. These factors are accounted for by a proposed method providing initially different winding schemes, i.e., helical, cylindrical, and pancake. We pursue a versatile optimization scheme that is applicable to different winding types. The above requires advanced numerical techniques and hence simulation studies for calculating the leakage flux density and electromagnetic forces in each configuration scheme. Considering the optimization of all the aforementioned criteria (ac losses, circulating currents, and electromagnetic forces), an intelligent choice of optimal winding geometry is obtained using analytical hierarchy process optimization, which is the main motivation for this brief.
Autors: Daneshmand, S. V.;Heydari, H.;Shakeri, S.;
Appeared in: IEEE Transactions on Applied Superconductivity
Publication date: Feb 2011, volume: 21, issue:1, pages: 2 - 12
Publisher: IEEE
Full litterature document
 
» Multidimensional Filter Bank Signal Reconstruction From Multichannel Acquisition
Abstract:
We study the theory and algorithms of an optimal use of multidimensional signal reconstruction from multichannel acquisition by using a filter bank setup. Suppose that we have an -channel convolution system, referred to as analysis filters, in dimensions. Instead of taking all the data and applying multichannel deconvolution, we first reduce the collected data set by an integer uniform sampling matrix , and then search for a synthesis polyphase matrix which could perfectly reconstruct any input discrete signal. First, we determine the existence of perfect reconstruction (PR) systems for a given set of finite-impulse response (FIR) analysis filters. Second, we present an efficient algorithm to find a sampling matrix with maximum sampling rate and to find a FIR PR synthesis polyphase matrix for a given set of FIR analysis filters. Finally, once a particular FIR PR synthesis polyphase matrix is found, we can characterize all FIR PR synthesis matrices, and then find an optimal one according to design criteria including robust reconstruction in the presence of noise.
Autors: Law, K. L.;Do, M. N.;
Appeared in: IEEE Transactions on Image Processing
Publication date: Feb 2011, volume: 20, issue:2, pages: 317 - 326
Publisher: IEEE
Full litterature document
 
» Multidimensional Modulation Technique for Cascaded Multilevel Converters
Abstract:
Multilevel cascaded H-bridge converters have found industrial application in the medium-voltage high-power range. In this paper, a generalized modulation technique for this type of converter based on a multidimensional control region is presented. Using the multidimensional control region, it is shown that all previous modulation techniques are particularized versions of the proposed method. Several possible solutions to develop a specific implementation of the modulation method are addressed in order to show the potential possibilities and the flexibility of the proposed technique. In addition, a feedforward version of this technique is also introduced to determine the switching sequence and the switching times, avoiding low harmonic distortion with unbalanced dc voltages. Experimental results are shown in order to validate the proposed concepts.
Autors: Leon, J. I.;Kouro, S.;Vazquez, S.;Portillo, R.;Franquelo, L. G.;Carrasco, J. M.;Rodriguez, J.;
Appeared in: IEEE Transactions on Industrial Electronics
Publication date: Feb 2011, volume: 58, issue:2, pages: 412 - 420
Publisher: IEEE
Full litterature document
 
» Multidimensional Two-Level Multiphase Space Vector PWM Algorithm and Its Comparison With Multifrequency Space Vector PWM Method
Abstract:
A multilevel multiphase space vector pulsewidth modulation (SVPWM) algorithm has been introduced recently, in which the reference is separated into an integer part and a fractional part. The fractional part is, in essence, a two-level multiphase space vector algorithm. This paper shows that, with appropriate adaptations, the fractional part of the general space vector multilevel multiphase PWM can be applied as a stand-alone PWM method in conjunction with two-level voltage-source converters with any number of phases. Simulation results of the five- and six-phase cases are shown, and the new algorithm is compared with another recent multifrequency SVPWM algorithm, which follows the standard approach of selecting the switching vectors and calculating their application times using planes. The experimental verification is provided using a five-phase two-motor series-connected induction motor drive, supplied from a custom-designed five-phase voltage-source inverter.
Autors: Lopez, O.;Dujic, D.;Jones, M.;Freijedo, F. D.;Doval-Gandoy, J.;Levi, E.;
Appeared in: IEEE Transactions on Industrial Electronics
Publication date: Feb 2011, volume: 58, issue:2, pages: 465 - 475
Publisher: IEEE
Full litterature document
 
» Multilevel luminance control in solution processed tandem organic multistable light-emitting diode fabricated by a stamp transfer printing method
Abstract:
image

Autors:

Graphical abstract

 Graphical abstract: A solution processed tandem organic multistable light-emitting diode was developed using a stamp transfer printing method and a high on/off ratio over 1000, luminance control over 300cd/m2 and four leve
Appeared in: Organic Electronics
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Multimodule Micro Transportation System Based on Electrostatic Comb-Drive Actuator and Ratchet Mechanism
Abstract:
We present a novel multimodule micro transportation system (MTS), which can drive micro containers in straight, curved, and T-junction paths based on electrostatic comb-drive actuator and ratchet mechanism. The transported objects are micro containers, which have two pairs of driving wings and anti-reverse wings attached to a body. Their movement is like a water strider, i.e., its driving wings rotate backward to generate reaction force to push the containers forward, while the anti-reverse wings act as a ratchet mechanism to prevent the container from moving backward. By developing three basic modules, i.e., straight, turning, and T-junction modules, the different configurations of the MTS can be built from these modules conveniently. Each module consists of ratchet racks driven by electrostatic comb-drive actuators. Containers having length, width, and thickness of 500, 250, and 30 , respectively, were driven to move with a changeable velocity up to 1000 in straight, turning, and T-junction modules. The velocity of the container was proportional to the frequency of driving voltage. By utilizing silicon micromachining technology, a prototype of MTS was fabricated from silicon-on-insulator wafer with only one mask. [2010-0126]
Autors: Dao, D. V.;Pham, P. H.;Sugiyama, S.;
Appeared in: Journal of Microelectromechanical Systems
Publication date: Feb 2011, volume: 20, issue:1, pages: 140 - 149
Publisher: IEEE
Full litterature document
 
» Multiobjective Optimization of OFDM Radar Waveform for Target Detection
Abstract:
We propose a multiobjective optimization (MOO) technique to design an orthogonal-frequency-division multiplexing (OFDM) radar signal for detecting a moving target in the presence of multipath reflections. We employ an OFDM signal to increase the frequency diversity of the system, as different scattering centers of a target resonate variably at different frequencies. Moreover, the multipath propagation increases the spatial diversity by providing extra “looks” at the target. First, we develop a parametric OFDM radar model by reformulating the target-detection problem as the task of sparse-signal spectrum estimation. At a particular range cell, we exploit the sparsity of multiple paths and the knowledge of the environment to estimate the paths along which the target responses are received. Then, to estimate the sparse vector, we employ a collection of multiple small Dantzig selectors (DS) that utilizes more prior structures of the sparse vector. We use the -constrained minimal singular value ( -CMSV) of the measurement matrix to analytically evaluate the reconstruction performance and demonstrate that our decomposed DS performs better than the standard DS. In addition, we propose a constrained MOO-based algorithm to optimally design the spectral parameters of the OFDM waveform for the next coherent processing interval by simultaneously optimizing two objective functions: minimizing the upper bound on the estimation error to improve the efficiency of sparse-recovery and maximizing the squared Mahalanobis-distance to increase the performance of the underlying detection problem. We provide a few numerical examples to illustrate the performance characteristics of the sparse recovery and demonstrate the achieved performance improvement due to adaptive OFDM waveform design.
Autors: Sen, S.;Tang, G.;Nehorai, A.;
Appeared in: IEEE Transactions on Signal Processing
Publication date: Feb 2011, volume: 59, issue:2, pages: 639 - 652
Publisher: IEEE
Full litterature document
 
» Multiphase DC–DC Converters Using a Boost-Half-Bridge Cell for High-Voltage and High-Power Applications
Abstract:
In this paper, multiphase dc–dc converters are proposed for high-voltage and high-power applications. A generalized converter is configured such that the boost-half-bridge (BHB) cells and voltage doublers are connected in parallel or in series to increase the output voltage and/or the output power. In addition to reduced device voltage and current ratings by the connection, the proposed converter has the following features: high-step-up voltage gain with significantly reduced transformer turn ratio, low-input current ripple due to interleaving effect, zero-voltage switching turn-ON of switches and zero-current switching turn-OFF of diodes, no additional clamping and start-up circuits required, high-component availability and easy thermal distribution due to the use of multiple small components, and flexibility in device selection resulting in optimized design. A design guideline of determining the optimum circuit configuration for given output voltage and power level is presented. Experimental results are also provided to validate the proposed concept.
Autors: Yoon, C.;Kim, J.;Choi, S.;
Appeared in: IEEE Transactions on Power Electronics
Publication date: Feb 2011, volume: 26, issue:2, pages: 381 - 388
Publisher: IEEE
Full litterature document
 
» Multiple Functional ECG Signal is Processing for Wearable Applications of Long-Term Cardiac Monitoring
Abstract:
In this paper, an integrated electrocardiogram (ECG) signal-processing scheme is proposed. Using a systematic wavelet transform algorithm, this signal-processing scheme can realize multiple functions in real time, including baseline-drift removal, noise suppression, QRS detection, heart beat rate prediction and classification, and clean ECG reconstruction. Utilizing the novel low-cost hardware architecture, the proposed ECG signal-processing scheme is implemented in application-specific integrated circuits with 0.18 μ m CMOS technology. This ECG signal-processor chip achieves low area and power consumptions, and is highly suitable for wearable applications of long-term cardiac monitoring.
Autors: Liu, X.;Zheng, Y.;Phyu, M.;Zhao, B.;Je, M.;Yuan, X.;
Appeared in: IEEE Transactions on Biomedical Engineering
Publication date: Feb 2011, volume: 58, issue:2, pages: 380 - 389
Publisher: IEEE
Full litterature document
 
» Multiple tabu search algorithm for economic dispatch problem considering valve-point effects
Abstract:
This paper presents a multiple tabu search (MTS) algorithm to solve the economic dispatch (ED) problem by taking valve-point effects into consideration. The practical ED problem with valve-point effects is represented as a non-smooth optimization problem with equality and inequality constraints that make the problem of finding the global or near global optimum difficult. The proposed MTS algorithm is the sequential execution of individual tabu search (TS) algorithm simultaneously by only one personal microcomputer. The MTS algorithm introduces additional techniques for improvement of search process, such as initialization, adaptive searches, multiple searches, replacing and restarting process. To show its effectiveness,...
Autors: Worawat, Sa-ngiamvibool , Saravuth, Pothiya , Issarachai, Ngamroo
Appeared in: International Journal of Electrical Power & Energy Systems
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Multiple-Access Network Information-Flow and Correction Codes
Abstract:
This work considers the multiple-access multicast error-correction scenario over a packetized network with malicious edge adversaries. The network has min-cut and packets of length , and each sink demands all information from the set of sources . The capacity region is characterized for both a “side-channel” model (where sources and sinks share some random bits that are secret from the adversary) and an “omniscient” adversarial model (where no limitations on the adversary's knowledge are assumed). In the “side-channel” adversarial model, the use of a secret channel allows higher rates to be achieved compared to the “omniscient” adversarial model, and a polynomial-complexity capacity-achieving code is provided. For the “omniscient” adversarial model, two capacity-achieving constructions are given: the first is based on random subspace code design and has complexity exponential in , while the second uses a novel multiple-field-extension technique and has complexity, which is polynomial in the network size. Our code constructions are “end-to-end” in that all nodes except the sources and sinks are oblivious to the adversaries and may simply implement predesigned linear network codes (random or otherwise). Also, the sources act independently without knowledge of the data from other sources.
Autors: Dikaliotis, T. K.;Ho, T.;Jaggi, S.;Vyetrenko, S.;Yao, H.;Effros, M.;Kliewer, J.;Erez, E.;
Appeared in: IEEE Transactions on Information Theory
Publication date: Feb 2011, volume: 57, issue:2, pages: 1067 - 1079
Publisher: IEEE
Full litterature document
 
» Multiple-input multiple-output radar aperture optimisation
Abstract:
The authors describe a process for designing low-cost, light-weight antenna apertures for use in multiple-input multiple-output (MIMO) radars. In a MIMO radar system, two or more transmitters emit independent waveforms, with the resulting reflections received by an array of receivers. Recently, MIMO radar has become a subject of great interest. In part, this interest is due to the potential for MIMO techniques to reduce radar weight and cost, while maintaining performance (as compared with conventional radar approaches). However, the size of these reductions has not yet been quantified. Here, the authors describe a process for designing optimal radar apertures. This process treats the design problem as one of minimising an objective function under performance constraints. The objective function is based upon a first-order model for the relationship between cost (or weight) and performance, and is derived for systems employing active, element-digitised arrays. A systematic process for optimising the aperture's design with respect to this objective function is presented, and equations describing the optimal aperture are derived. These equations provide insight into the optimal relationship between various aperture characteristics, such as the number of transmitters, number of receivers, module power level and virtual array length.
Autors: Rabideau, D.J.;
Appeared in: IET Radar, Sonar & Navigation
Publication date: Feb 2011, volume: 5, issue:2, pages: 155 - 162
Publisher: IEEE
Full litterature document
 
» Multirate and multi-quality-of-service passive optical network based on hybrid WDM/OCDM system
Abstract:
In this article we present a new scheme to support multirate and multi-quality-of-service transmission in passive optical networks based on a hybrid wavelength-division multiplexing/ optical code-division multiplexing scheme. The idea is to use multilength variable-weight optical orthogonal codes as signature sequences of a hybrid WDM/OCDM system. To provide the requested classes of service, the code weight and code length of MLVW-OOCs are designed based on the characteristics of the requested classes of service. In order to mitigate multiple access interference, we propose to utilize a multilevel signaling technique and interference remover structure based on advanced optical logic gate elements. We show that utilizing such a technique improves the QoS of the proposed scheme.
Autors: Beyranvand, H.;Salehi, J.A.;
Appeared in: IEEE Communications Magazine
Publication date: Feb 2011, volume: 49, issue:2, pages: s39 - s44
Publisher: IEEE
Full litterature document
 
» Multiregion Image Segmentation by Parametric Kernel Graph Cuts
Abstract:
The purpose of this study is to investigate multiregion graph cut image partitioning via kernel mapping of the image data. The image data is transformed implicitly by a kernel function so that the piecewise constant model of the graph cut formulation becomes applicable. The objective function contains an original data term to evaluate the deviation of the transformed data, within each segmentation region, from the piecewise constant model, and a smoothness, boundary preserving regularization term. The method affords an effective alternative to complex modeling of the original image data while taking advantage of the computational benefits of graph cuts. Using a common kernel function, energy minimization typically consists of iterating image partitioning by graph cut iterations and evaluations of region parameters via fixed point computation. A quantitative and comparative performance assessment is carried out over a large number of experiments using synthetic grey level data as well as natural images from the Berkeley database. The effectiveness of the method is also demonstrated through a set of experiments with real images of a variety of types such as medical, synthetic aperture radar, and motion maps.
Autors: Salah, M. B.;Mitiche, A.;Ayed, I. B.;
Appeared in: IEEE Transactions on Image Processing
Publication date: Feb 2011, volume: 20, issue:2, pages: 545 - 557
Publisher: IEEE
Full litterature document
 
» Multiregion Short-Term Load Forecasting in Consideration of HI and Load/Weather Diversity
Abstract:
The ultimate goal of an electric utility is to create maximum profit while maintaining reliability and security of the power supply. The operation and control of power system is sensitive to system demand. Therefore, improvements in load-forecasting accuracy will lead to cost savings and enhance system security. Due to Taiwan's distinct climate characteristics, it is difficult to obtain satisfactory load-forecasting results by treating the whole island as a single region. In addition, weather factors, such as temperature, relative humidity, and the Heat Index (HI) (a human-perceived equivalent temperature) may also affect load-consumption patterns. This paper proposes a multiregion short-term load-forecasting methodology, taking into account the HI to improve load-forecasting accuracy in Taiwan Power Company's (Taipower's) system. The results show that adopting the HI as a parameter can effectively improve the accuracy if the temperature of the region under investigation is above 27 (80 ). By considering both the load/weather diversity and the HI, further improvements to the load forecasting for the Taipower system during summer can be achieved.
Autors: Chu, W.-C.;Chen, Y.-P.;Xu, Z.-W.;Lee, W.-J.;
Appeared in: IEEE Transactions on Industry Applications
Publication date: Feb 2011, volume: 47, issue:1, pages: 232 - 237
Publisher: IEEE
Full litterature document
 
» Multiscale Compressed Block Decomposition for Fast Direct Solution of Method of Moments Linear System
Abstract:
The multiscale compressed block decomposition algorithm (MS-CBD) is presented for highly accelerated direct (non iterative) solution of electromagnetic scattering and radiation problems with the method of moments (MoM). The algorithm is demonstrated to exhibit computational complexity and storage requirements scaling with , for electrically large objects. Several numerical examples illustrate the efficiency of the method, in particular for problems with multiple excitation vectors. The largest problem presented in this paper is the monostatic RCS of the NASA almond at 50 GHz, for one thousand incidence angles, discretized using 442,089 RWG basis functions. Being entirely algebraic, MS-CBD is independent of the Greens function of the problem.
Autors: Heldring, A.;Rius, J. M.;Tamayo, J. M.;Parr??n, J.;Ubeda, E.;
Appeared in: IEEE Transactions on Antennas and Propagation
Publication date: Feb 2011, volume: 59, issue:2, pages: 526 - 536
Publisher: IEEE
Full litterature document
 
» Multiscale Recurrence Quantification Analysis of Spatial Cardiac Vectorcardiogram Signals
Abstract:
Myocardial infarction (MI), also known as a heart attack, is a leading cause of mortality in the world. Spatial vectorcardiogram (VCG) signals are recorded on the body surface to monitor the underlying cardiac electrical activities in three orthogonal directions of the body, namely, frontal, transverse, and sagittal planes. The 3-D VCG vector loops provide a new way to study the cardiac dynamical behaviors, as opposed to the conventional time-delay reconstructed phase space from a single ECG trace. However, few, if any, previous approaches studied the relationships between cardiac disorders and recurrence patterns in VCG signals. This paper presents the recurrence quantification analysis (RQA) of VCG signals in multiple wavelet scales for the identification of cardiac disorders. The linear classification models using multiscale RQA features were shown to detect MI with an average sensitivity of 96.5% and an average specificity of 75% in the randomized classification experiments of PhysioNet Physikalisch-Technische Bundesanstalt database, which is comparable to the performance of human experts. This study is strongly indicative of potential automated MI classification algorithms for diagnostic and therapeutic purposes.
Autors: Yang, H.;
Appeared in: IEEE Transactions on Biomedical Engineering
Publication date: Feb 2011, volume: 58, issue:2, pages: 339 - 347
Publisher: IEEE
Full litterature document
 
» Multitemporal Image Change Detection Using Undecimated Discrete Wavelet Transform and Active Contours
Abstract:
In this paper, an unsupervised change detection method for satellite images is proposed. Owing to its robustness against noise, the undecimated discrete wavelet transform is exploited to obtain a multiresolution representation of the difference image, which is obtained from two satellite images acquired from the same geographical area but at different time instances. A region-based active contour model is then applied to the multiresolution representation of the difference image for segmenting the difference image into the “changed” and “unchanged” regions. The proposed change detection method has been conducted on two types of image data sets, i.e., the synthetic aperture radar images and the optical images. The change detection results are compared with several state-of-the-art techniques. The extensive simulation results clearly show that the proposed change detection method consistently yields superior performance.
Autors: Celik, T.;Ma, K-K.;
Appeared in: IEEE Transactions on Geoscience and Remote Sensing
Publication date: Feb 2011, volume: 49, issue:2, pages: 706 - 716
Publisher: IEEE
Full litterature document
 
» Multivariable Gaussian Evolving Fuzzy Modeling System
Abstract:
This paper introduces a class of evolving fuzzy rule-based system as an approach for multivariable Gaussian adaptive fuzzy modeling. The system is an evolving Takagi–Sugeno (eTS) functional fuzzy model, whose rule base can be continuously updated using a new recursive clustering algorithm based on participatory learning. The fuzzy sets of the rule antecedents are multivariable Gaussian membership functions, which have been adopted to preserve information between input variable interactions. The parameters of the membership functions are estimated by the clustering algorithm. A weighted recursive least-squares algorithm updates the parameters of the rule consequents. Experiments considering time-series forecasting and nonlinear system identification are performed to evaluate the performance of the approach proposed. The multivariable Gaussian evolving fuzzy models are compared with alternative evolving fuzzy models and classic models with fixed structures. The results suggest that multivariable Gaussian evolving fuzzy modeling is a promising approach for adaptive system modeling.
Autors: Lemos, A.;Caminhas, W.;Gomide , F.;
Appeared in: IEEE Transactions on Fuzzy Systems
Publication date: Feb 2011, volume: 19, issue:1, pages: 91 - 104
Publisher: IEEE
Full litterature document
 
» Multivariate empirical mode decomposition and application to multichannel filtering
Abstract:
 Abstract: Empirical Mode Decomposition (EMD) is an emerging topic in signal processing research, applied in various practical fields due in particular to its data-driven filter bank properties. In this paper, a novel EMD approach called X-EMD (eXtended-EMD) is proposed, which allows for a straightforward decomposition of mono- and multivariate signals without any change in the core of the algorithm. Qualitative results illustrate the good behavior of the proposed algorithm whatever the signal dimension is. Moreover, a comparative study of X-EMD with classical mono- and multivariate methods is presented and shows its competitiveness. Besides, we show that X-EMD extends the filter bank...
Autors: Julien, Fleureau , Amar, Kachenoura , Laurent, Albera , Jean-Claude, Nunes , Lotfi, Senhadji
Appeared in: Signal Processing
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Muscle Plasticity in Rat Following Spinal Transection and Chronic Intraspinal Microstimulation
Abstract:
Intraspinal microstimulation (ISMS) employs electrical stimulation of the ventral grey matter to reactivate paralyzed skeletal muscle. This work evaluated the transformations in the quadriceps muscle that occurred following complete transection and chronic stimulation with ISMS or a standard nerve cuff (NCS). Stimulation was applied for 30 days, 4 h/day. Both methods induced significant increases in time-to-peak tension (ISMS 35%, NCS 25%) and half rise-time (ISMS 39%, NCS 25%) compared to intact controls (IC). Corresponding increases in type-IIA myosin heavy chain (MHC) and decreases in type-IID MHC were noted compared to IC. These results were unexpected because ISMS recruits motor units in a near-normal physiological order while NCS recruits motor units in a reversed order. Spinal cord transection and 30 days of stimulation did not alter either recruitment profile. The slope of the force recruitment curves obtained through ISMS following transection and 30 days of stimulation was similar to that obtained in intact animals, and 3.4-fold shallower than that obtained through NCS. The transformations observed in the current work are best explained by the near maximal level of motor unit recruitment, the total daily time of activity and the tonic nature of the stimulation paradigm.
Autors: Bamford, J. A.;Putman, C. T.;Mushahwar, V. K.;
Appeared in: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Publication date: Feb 2011, volume: 19, issue:1, pages: 79 - 83
Publisher: IEEE
Full litterature document
 
» N-Skart: A Nonsequential Skewness- and Autoregression-Adjusted Batch-Means Procedure for Simulation Analysis
Abstract:
We discuss N-Skart, a nonsequential procedure designed to deliver a confidence interval (CI) for the steady-state mean of a simulation output process when the user supplies a single simulation-generated time series of arbitrary size and specifies the required coverage probability for a CI based on that data set. N-Skart is a variant of the method of batch means that exploits separate adjustments to the half-length of the CI so as to account for the effects on the distribution of the underlying Student's -statistic that arise from skewness (nonnormality) and autocorrelation of the batch means. If the sample size is sufficiently large, then N-Skart delivers not only a CI but also a point estimator for the steady-state mean that is approximately free of initialization bias. In an experimental performance evaluation involving a wide range of test processes and sample sizes, N-Skart exhibited close conformance to the user-specified CI coverage probabilities.
Autors: Tafazzoli, A.;Steiger, N. M.;Wilson, J. R.;
Appeared in: IEEE Transactions on Automatic Control
Publication date: Feb 2011, volume: 56, issue:2, pages: 254 - 264
Publisher: IEEE
Full litterature document
 
» Nanofabrication of hard X-ray optics by metal electroplating in a dry etched mechanically stable inorganic template
Abstract:
A nanofabrication process for high resolution X-ray optics and X-ray lithography masks was developed. The process is based on the plasma etching of a sacrificial hard inorganic interlayer (Si, Si3N4, SiOx or HSQ) used for pattern transfer and aspect ratio amplification. The structures are first defined on a top thin metal film by electron beam lithography and lift-off; a thin nickel layer at the bottom of the hard interlayer is used as etch stop. A base plating (Cr/Au) under the nickel serves as seed layer for the electroplating of an X-ray absorber or phase shifting material. The fabrication is completed...
Autors: Gianluca, Grenci , Alessandro, Pozzato , Alessandro, Carpentiero , Enrico, Sovernigo , Massimo, Tormen
Appeared in: Microelectronic Engineering
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Nanofin based filaments for sensor applications
Abstract:
The field of nanoelectromechanical systems (NEMS) gains in importance and interest. The combination of micromechanics and nanotechnology enables the development of innovative nanosystems. In addition to the potential high integration level these systems feature superior properties especially concerning their power consumption and sensitivity. Systems with a low mass and a high surface-area-to-volume-ratio (SAVR) allow extreme high responsiveness if the active principle of a sensor is depended on its surface. To enlarge the field of possible applications - for example regeneration of a reactive sensor surface by annealing - a heated sensor is desirable. Therefore nanofin based filaments which can be...
Autors: Klaus T., Kallis , Lars O., Keller , Christian, Küchenmeister , John T., Horstmann , J., Knoch , ...
Appeared in: Microelectronic Engineering
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Nanoimprint of ordered ferro/piezoelectric P(VDF-TrFE) nanostructures
Abstract:
The next generation of portable computing and communication devices tremendously depend on the technologies that enable the rapid manipulation, caching and high-density nonvolatile data storage. The recent development of organic electronics requires high-quality organic memory compatible with other devices, which will eventually lead to the realization of all organic electronic systems. The challenge of the organic electronics application is to find less degradative ways of fabricating ferroelectric polymer nanostructures. In this work, we applied the nanoimprint technique to fabricate ferroelectric poly (vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] copolymer line and dot nanostructures and compared the ferroelectric properties and domain formation in these two...
Autors: Jiang-Rong, Fang , Zhen-Kui, Shen , Shen, Yang , Qian, Lu , Jinxing, Li , ...
Appeared in: Microelectronic Engineering
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Nanosecond Delay Floating High Voltage Level Shifters in a 0.35 m HV-CMOS Technology
Abstract:
We present novel circuits for high-voltage digital level shifting with zero static power consumption. The conventional topology is analysed, showing the strong dependence of speed and dynamic power on circuit area. Novel techniques are shown to circumvent this and speed up the operation of the conventional level-shifter architecture by a factor of 5–10 typically and 30–190 in the worst case. In addition, these circuits use 50% less silicon area and exhibit a factor of 20–80 lower dynamic power consumption typically. Design guidelines and equations are given to make the design robust over process corners, ensuring good production yield. The circuits were fabricated in a 0.35 high-voltage CMOS process and verified. Due to power and IO speed limitation on the test chip, a special ring oscillator and divider structure was used to measure inherent circuit speed.
Autors: Moghe, Y.;Lehmann, T.;Piessens, T.;
Appeared in: IEEE Journal of Solid-State Circuits
Publication date: Feb 2011, volume: 46, issue:2, pages: 485 - 497
Publisher: IEEE
Full litterature document
 
» Nearly Diffraction-Limited Tapered Lasers at 675 nm With 1-W Output Power and Conversion Efficiencies Above 30%
Abstract:
High brightness, highly efficient tapered lasers emitting around 675 nm have been developed. The devices have a 500- -long straight section and a 1500- -long tapered section with a flare angle of 3 . At a temperature of 25 and a current of 1.5 A, the lasers emit an output power of nearly 1.2 W. The maximum conversion efficiency of 31% is reached at an output power of 1 W. The emitted beam is nearly diffraction-limited with a beam propagation ratio (second moments) of 2.2.Pub _bookmark Command="[Quick Mark]"
Autors: Sumpf, B.;Adamiec, P.;Zorn, M.;Wenzel, H.;Erbert, G.;
Appeared in: IEEE Photonics Technology Letters
Publication date: Feb 2011, volume: 23, issue:4, pages: 266 - 268
Publisher: IEEE
Full litterature document
 
» NEC Article 708
Abstract:
The National Electrical Code (NEC) has a new section that was added in 2008: Article 708 - Critical Operations Power Systems (COPs). Although NEC applies only to the United States, the methodology of evaluating risk and performing analysis applies to any type of of critical facility. This article provides an overview of the requirements listed in Article 708 and presents some existing technologies that can be used to fulfill the specific requirements listed in the section on risk management.
Autors: Arno, R.G.;Stoyas, E.;Schuerger, R.;
Appeared in: IEEE Industry Applications Magazine
Publication date: Feb 2011, volume: 17, issue:1, pages: 20 - 25
Publisher: IEEE
Full litterature document
 
» Need for secure access to medical records drives Imprivata growth
Abstract:
Imprivata has reported record growth for 2010, with 30% year-over-year bookings growth.
Autors: [No author name available]
Appeared in: Biometric Technology Today
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» NEMA NU 4-2008 Performance Measurements of Two Commercial Small-Animal PET Scanners: ClearPET and rPET-1
Abstract:
In this work, we compare two commercial positron emission tomography (PET) scanners installed at CIEMAT (Madrid, Spain): the ClearPET and the rPET-1. These systems have significant geometrical differences, such as the axial field of view (110 mm on ClearPET versus 45.6 mm on rPET-1), the configuration of the detectors (whole ring on ClearPET versus one pair of planar blocks on rPET-1) and the use of an axial shift between ClearPET detector modules. We used an assessment procedure that fulfilled the recommendations of the National Electrical Manufacturers Association (NEMA) NU 4-2008 standard. The methodology includes studies of spatial resolution, sensitivity, scatter fraction, count losses and image quality. Our experiments showed a central spatial resolution of 1.5 mm (transaxial), 3.2 mm (axial) for the ClearPET and 1.5 mm (transaxial), 1.6 mm (axial) for the rPET-1, with a small variation across the transverse axis on both scanners ( mm). The absolute sensitivity at the centre of the field of view was 4.7% for the ClearPET and 1.0% for the rPET-1. The peak noise equivalent counting rate for the mouse-sized phantom was 73.4 kcps reached at 0.51 MBq/mL on the ClearPET and 29.2 kcps at 1.35 MBq/mL on the rPET-1. The recovery coefficients measured using the image quality phantom ranged from 0.11 to 0.89 on the ClearPET and from 0.14 to 0.81 on the rPET-1. The overall performance shows that both the ClearPET and the rPET-1 systems are very suitable for preclinical research and imaging of small animals.
Autors: Canadas, M.;Embid, M.;Lage, E.;Desco, M.;Vaquero, J. J.;Perez, J. M.;
Appeared in: IEEE Transactions on Nuclear Science
Publication date: Feb 2011, volume: 58, issue:1, pages: 58 - 65
Publisher: IEEE
Full litterature document
 
» Network Coding for Computing: Cut-Set Bounds
Abstract:
The following network computing problem is considered. Source nodes in a directed acyclic network generate independent messages and a single receiver node computes a target function of the messages. The objective is to maximize the average number of times can be computed per network usage, i.e., the “computing capacity”. The network coding problem for a single-receiver network is a special case of the network computing problem in which all of the source messages must be reproduced at the receiver. For network coding with a single receiver, routing is known to achieve the capacity by achieving the network min-cut upper bound. We extend the definition of min-cut to the network computing problem and show that the min-cut is still an upper bound on the maximum achievable rate and is tight for computing (using coding) any target function in multi-edge tree networks. It is also tight for computing linear target functions in any network. We also study the bound's tightness for different classes of target functions. In particular, we give a lower bound on the computing capacity in terms of the Steiner tree packing number and a different bound for symmetric functions. We also show that for certain networks and target functions, the computing capacity can be less than an arbitrarily small fraction of the min-cut bound.
Autors: Appuswamy, R.;Franceschetti, M.;Karamchandani, N.;Zeger, K.;
Appeared in: IEEE Transactions on Information Theory
Publication date: Feb 2011, volume: 57, issue:2, pages: 1015 - 1030
Publisher: IEEE
Full litterature document
 
» Network defense gone wrong [Update]
Abstract:
Autors: Schneider, D.;
Appeared in: IEEE Spectrum
Publication date: Feb 2011, volume: 48, issue:2, pages: 11 - 12
Publisher: IEEE
Full litterature document
 
» Network Error Correction With Unequal Link Capacities
Abstract:
This paper studies the capacity of single-source single-sink noiseless networks under adversarial or arbitrary errors on no more than edges. Unlike prior papers, which assume equal capacities on all links, arbitrary link capacities are considered. Results include new upper bounds, network error-correction coding strategies, and examples of network families where our bounds are tight. An example is provided of a network where the capacity is 50% greater than the best rate that can be achieved with linear coding. While coding at the source and sink suffices in networks with equal link capacities, in networks with unequal link capacities, it is shown that intermediate nodes may have to do coding, nonlinear error detection, or error correction in order to achieve the network error-correction capacity.
Autors: Kim, S.;Ho, T.;Effros, M.;Avestimehr, A. S.;
Appeared in: IEEE Transactions on Information Theory
Publication date: Feb 2011, volume: 57, issue:2, pages: 1144 - 1164
Publisher: IEEE
Full litterature document
 
» Network Generalized Hamming Weight
Abstract:
In this work, we extend the notion of generalized Hamming weight for classical linear block codes to linear network codes by introducing the network generalized Hamming weight (NGHW) for a given network with respect to a fixed linear network code. The basic properties of NGHW are studied. We further show that NGHW can be used as a tool to characterize the security performance of a linear network code on a wiretap network. We also introduce the notion of network maximum distance separable code (NMDS code) by extending the notion of Maximum Distance Separable code in classical algebraic coding theory. We prove that NMDS codes play an important role in minimizing the information that an eavesdropper can obtain from the network.
Autors: Ngai, C.-K.;Yeung, R. W.;Zhang, Z.;
Appeared in: IEEE Transactions on Information Theory
Publication date: Feb 2011, volume: 57, issue:2, pages: 1136 - 1143
Publisher: IEEE
Full litterature document
 
» Network-Based Root of Trust for Installation
Abstract:
Administrators of large datacenters often require network installation mechanisms, such as disk cloning over the network, to manage the integrity of their machines. However, network-based installation is vulnerable to a variety of attacks, including compromised machines responding to installation requests with malware. To enable verification that running machines were installed correctly, the Network-Based Root of Trust for Installation (netROTI, for short) binds the state of a system to its installer and disk image. Evaluation results show that a netROTI installation adds about 8 seconds overhead plus 3 percent of image download time to a standard network install and thwarts many known attacks against the installation process.
Autors: Schiffman, Joshua;Moyer, Thomas;Jaeger, Trent;McDaniel, Patrick;
Appeared in: IEEE Security & Privacy
Publication date: Feb 2011, volume: 9, issue:1, pages: 40 - 48
Publisher: IEEE
Full litterature document
 
» Neural-Network Security-Boundary Constrained Optimal Power Flow
Abstract:
This paper proposes a new approach to model stability and security constraints in optimal power flow (OPF) problems based on a neural network (NN) representation of the system security boundary (SB). The novelty of this proposal is that a closed form, differentiable function derived from the system's SB is used to represent security constraints in an OPF model. The procedure involves two main steps: First, an NN representation of the SB is obtained based on back-propagation neural network (BPNN) training. Second, a differentiable mapping function extracted from the BPNN is used to directly incorporate this function as a constraint in the OPF model. This approach ensures that the operating points resulting from the OPF solution process are within a feasible and secure region, whose limits are better represented using the proposed technique compared to typical security-constrained OPF models. The effectiveness and feasibility of the proposed approach is demonstrated through the implementation, as well as testing and comparison using the IEEE two-area and 118-bus benchmark systems, of an optimal dispatch technique that guarantees system security in the context of competitive electricity markets.
Autors: Gutierrez-Martinez, V. J.;Canizares, C. A.;Fuerte-Esquivel, C. R.;Pizano-Martinez, A.;Gu, X.;
Appeared in: IEEE Transactions on Power Systems
Publication date: Feb 2011, volume: 26, issue:1, pages: 63 - 72
Publisher: IEEE
Full litterature document
 
» Neuro-adaptive motion control with velocity observer in operational space formulation
Abstract:
In this paper, a neuro-adaptive motion control with velocity observer is developed and validated in real-time experiment using a 6 DOF PUMA 560 robot. The controller is constructed for the operational space formulation, such that dynamic terms and the generalized force descriptions in this algorithm are expressed in the task space. The proposed strategy assumes no prior knowledge of the robot dynamics, and is formulated without assuming the availability of joint velocity feedback. As such, the controller takes only position feedback. This is an important feature as industrial robots are often fitted only with joint displacement sensors, not joint rate...
Autors: Dandy B., Soewandito , Denny, Oetomo , Marcelo H., Ang Jr.
Appeared in: Robotics and Computer-Integrated Manufacturing
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» New Algorithms for Navigating a Gantry Tractor Comprising a “Chorus Line” of Synchronized Modules
Abstract:
This paper presents two new algorithms for real-time calculation of the wheel angles and speeds of gantry tractor modules. In transport mode, the gantry tractor is, in a sense, a snakelike robot with passive joints and active wheels, with each module having autonomous four-wheel drive and four-wheel steering. The algorithms determine the wheel angles and speeds of each module with the prescription that the four wheels will have the same center of curvature, wheel speeds provide cooperative redundancy, and all hitching points follow the same path, thereby eliminating scuffing and minimizing off-tracking. Details of the analytical algorithm for a predetermined path were presented at the 2009 IEEE International Conference on Industrial Technology, together with a simulation for a single module. In this paper, we also present the results of a newly developed numerical algorithm which enables the gantry tractor to be steered online by an operator. We also show, by simulation, that this new numerical algorithm gives a good approximation to analytical solutions. The numerical algorithm is then used to calculate wheel angles and speeds for a three-module tractor with the results depicted graphically as functions of time.
Autors: Percy, A.;Spark, I. J.;Ibrahim, M. Y.;
Appeared in: IEEE Transactions on Industrial Electronics
Publication date: Feb 2011, volume: 58, issue:2, pages: 398 - 402
Publisher: IEEE
Full litterature document
 
» New Depletion-Mode IGZO TFT Shift Register
Abstract:
A new shift register employing bottom-gate In–Ga–Zn–O thin-film transistors (IGZO TFTs) was proposed and fabricated. Depletion-mode IGZO TFTs were successfully turned off by employing two low-voltage-level signals. The IGZO shift register exhibited a high-voltage output pulse without any distortion and a maximum clock frequency of 417 kHz. The proposed shift register would be an important building block for a depletion-mode oxide TFT display.
Autors: Kim, B.;Ryoo, C.-I.;Kim, S.-J.;Bae, J.-U.;Seo, H.-S.;Kim, C.-D.;Han, M.-K.;
Appeared in: IEEE Electron Device Letters
Publication date: Feb 2011, volume: 32, issue:2, pages: 158 - 160
Publisher: IEEE
Full litterature document
 
» New method for the fusion of complementary information from infrared and visual images for object detection
Abstract:
Visual and infrared cameras have complementary properties and using them together may increase the performance of object detection applications. Although the fusion of visual and infrared information results in a better recall rate than using only one of those domains, there is always a decrease in the precision rate whereas the infrared domain on its own always has higher precision. Thus, the fusion of these domains is meaningful only for a better recall rate, which means that more foreground pixels are detected correctly. This study presents a new computationally more efficient and simpler method for extracting the complementary information from both domains and fusing them to obtain better recall rates than those previously achieved. The method has been tested using a well-known database and a database created for the study and compared with earlier fusion methods.
Autors: Ulusoy, I.;Yuruk, H.;
Appeared in: IET Image Processing
Publication date: Feb 2011, volume: 5, issue:1, pages: 36 - 48
Publisher: IEEE
Full litterature document
 
» New Mix codes for multiple bit upsets mitigation in fault-secure memories
Abstract:
Nowadays, multibit error correction codes (MECCs) are effective approaches to mitigate multiple bit upsets (MBUs) in memories. As technology scales, combinational circuits have become more susceptible to radiation induced single event transient (SET). Therefore, transient faults in encoding and decoding circuits are more frequent than before. Firstly, this paper proposes a new MECC, which is called Mix code, to mitigate MBUs in fault-secure memories. Considering the structure characteristic of MECC, Euclidean Geometry Low Density Parity Check (EG-LDPC) codes and Hamming codes are combined in the proposed Mix codes to protect memories against MBUs with low redundancy overheads. Then, the fault-secure...
Autors: Ming, Zhu , Li Yi, Xiao , Li Li, Song , Yan Jing, Zhang , Hong Wei, Luo
Appeared in: Microelectronics Journal
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» New Printing Robot for High-Resolution Pictures on Three-Dimensional Wide Surfaces
Abstract:
A novel five-axes robot for industrial large printing applications is presented in this paper. The robot was developed in the robotics team from PRIME institute Laboratoire de Mécanique des Solides. and an international patent was deposited for this invention in 2006. It concerns large-format 3-D printing on a fixed surface, like trailer tarpaulin for example. The robot is composed of an inkjet printing block and a device to dry the ink sprayed onto the surface. Kinematics of the mechanical device with 5 DOF was studied to position and orientate the printheads onto the surface to be printed. The structure of the robot is simple with high-speed capability and printing resolution. The working principle and mechanical structure are described, and the geometrical model and surface following control of the robot are also discussed. Finally, printing results in a practical situation illustrate the efficiency of the proposed 3-D printing robot, and an analysis of how the task is carried out is provided.
Autors: Gazeau, J.-P.;Eon, A.;Zeghloul, S.;Arsicault, M.;
Appeared in: IEEE Transactions on Industrial Electronics
Publication date: Feb 2011, volume: 58, issue:2, pages: 384 - 391
Publisher: IEEE
Full litterature document
 
» New Results on Filter Design for Nonlinear Systems With Time Delay via T–S Fuzzy Models
Abstract:
This paper focuses on the problem of designing filters for nonlinear systems with time-varying delay via Takagi–Sugeno (T–S) fuzzy models. Some new results on filter design are proposed by estimating the upper bounds of the derivatives of Lyapunov functionals without ignoring some useful terms, which improve the existing ones. In addition, a sufficient condition for the existence of such an filter is established in terms of solutions to a set of linear matrix inequalities (LMIs). Finally, two examples are given to demonstrate the effectiveness of the proposed method.
Autors: Huang, S-.J.;He, X-.Q.;Zhang, N-.N.;
Appeared in: IEEE Transactions on Fuzzy Systems
Publication date: Feb 2011, volume: 19, issue:1, pages: 193 - 199
Publisher: IEEE
Full litterature document
 
» New Stability Analysis for Tuning PI Controller of Power Converters in Railway Application
Abstract:
This paper presents a mathematical dynamic model of single-phase four-quadrant (4Q) converters employed at the input stage onboard high-speed trains. A new stability analysis capable of considering the time-variant nature of the system for the correct tuning of the feedback proportional-integral (PI) controller has been implemented. In particular, the innovation regards the application of a current-controlled modulation technique instead of the traditional PWM control currently used in high power traction converters. A dedicated model of a real converter installed onboard Italian high-speed trains has also been implemented in order to simulate its behavior and validate the theoretical analysis. Finally, a scaled-down prototype has been developed.
Autors: Brenna, M.;Foiadelli, F.;Zaninelli, D.;
Appeared in: IEEE Transactions on Industrial Electronics
Publication date: Feb 2011, volume: 58, issue:2, pages: 533 - 543
Publisher: IEEE
Full litterature document
 
» New Sustain Waveform for Improving Luminous Efficacy in AC PDPs Having 200- Electrode Gap
Abstract:
In this paper, we investigate the mechanism of low efficacy of a 200- -gap structure in a high driving frequency and suggest a new driving waveform for improving the efficacy. The detailed role of the address electrode during the surface discharge is discussed by measuring the discharge current flowing to each electrode. Our observation reveals that the current flowing to the address electrode increases with driving frequency and it makes the surface discharge be weakened. A new sustain waveform with the floating time has been suggested which can enhance the surface discharge by suppressing the opposite discharge. As a result of adopting the proposed sustain waveform, the luminous efficacy has been improved to around 30% compared with the conventional sustain waveform at the driving frequency of 200 kHz.
Autors: Shin, B. J.;Min, C.-S.;Seo, J.-H.;
Appeared in: IEEE Transactions on Plasma Science
Publication date: Feb 2011, volume: 39, issue:2, pages: 695 - 699
Publisher: IEEE
Full litterature document
 
» New Trends in Chapter Development [Chapter News]
Abstract:
Autors: Magyar, P.;
Appeared in: IEEE Industry Applications Magazine
Publication date: Feb 2011, volume: 17, issue:1, pages: 84 - 86
Publisher: IEEE
Full litterature document
 
» Newly Designed ZVS Multi-Input Converter
Abstract:
A newly designed zero-voltage-switching (ZVS) multi-input converter is proposed in this paper. The converter can boost the different voltages of two power sources to a stable output voltage. An auxiliary circuit is employed for achieving turn-on ZVS of all switches in the proposed converter. According to various situations, the operational states of the proposed converter can be divided into two states, including a single-power-supply and a dual-power-supply state. In the dual-power-supply state, the input circuits connected in series together with the designed pulsewidth modulation can greatly reduce the conduction loss of the switches. In addition, the effectiveness of the designed circuit topology and the ZVS properties are verified by experimental results, and the goal of high-efficiency conversion can be obtained.
Autors: Wai, R.-J.;Lin, C.-Y.;Liaw, J.-J.;Chang, Y.-R.;
Appeared in: IEEE Transactions on Industrial Electronics
Publication date: Feb 2011, volume: 58, issue:2, pages: 555 - 566
Publisher: IEEE
Full litterature document
 
» Newproducts
Abstract:
Autors: Goldberg, R.;
Appeared in: IEEE Instrumentation & Measurement Magazine
Publication date: Feb 2011, volume: 14, issue:1, pages: 46 - 51
Publisher: IEEE
Full litterature document
 
» News and Concluding Remarks [President's Column]
Abstract:
One of last duties of the outgoing IEEE Microwave Theory and Techniques Society (MTTS) president is to represent the Society in the fall meeting of the IEEE Technical Activities Board (TAB). Usually, the fall meeting is a busy one, with IEEE Societies initiating projects with the start of the new calendar year, which also coincides with the beginning of the IEEE's fiscal year. Some initiatives take several months to materialize and often receive their final approval in the TAB fall meeting, or harvest season if one can use this metaphor. In this column, I will share with you one news item as well as thoughts from the 2010 harvest season.
Autors: El-Ghazaly, S.;
Appeared in: IEEE Microwave Magazine
Publication date: Feb 2011, volume: 12, issue:1, pages: 8 - 12
Publisher: IEEE
Full litterature document
 
» News Briefs
Abstract:
IEEE Security & Privacy news briefs cover the latest in security, privacy, and policy.
Autors: Garber, Lee;
Appeared in: IEEE Security & Privacy
Publication date: Feb 2011, volume: 9, issue:1, pages: 15 - 17
Publisher: IEEE
Full litterature document
 
» News from Japan
Abstract:
Autors: Ohki, Y.;
Appeared in: IEEE Electrical Insulation Magazine
Publication date: Feb 2011, volume: 27, issue:1, pages: 63 - 64
Publisher: IEEE
Full litterature document
 
» News in Brief
Abstract:
[No author name available]
Autors: Source: Biometric Technology Today, Volume 2011, Issue 2, February 2011, Page 4
Appeared in: Biometric Technology Today
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Next-Generation CMOS RF Power Amplifiers
Abstract:
Ten years ago, it was widely accepted conventional wisdom that wattlevel fully integrated power amplifiers (PAs) were not feasible in standard complimentary metal-oxide-semiconductor (CMOS) technology. Today, millions of such devices are commercially produced and shipped every month and are used in hundreds of millions of cellular phones across the world. Such dramatic transition from being considered an impossibility even by most optimistic academics to the obvious future direction to be followed by everyone happened through a series of demonstrations based on new architectures radically different from the known PA topologies applied over more than half a century.
Autors: Hajimiri, A.;
Appeared in: IEEE Microwave Magazine
Publication date: Feb 2011, volume: 12, issue:1, pages: 38 - 45
Publisher: IEEE
Full litterature document
 
» Next-Generation Virtual Worlds: Architecture, Status, and Directions
Abstract:
It seems likely that the Web as we know it will undergo several paradigm shifts in the coming years: its content will expand from 2D documents to also accommodate 3D virtual worlds; with new technologies like RFID and smartphones, be able to link to a place or thing (in the real or virtual world) and associate more metadata annotations with things in the real and virtual worlds to create increasingly smart semantic worlds. But to realize these promises, the virtual world and ubiquitous computing communities will need architectures that are standard enough to become pervasive and flexible enough to expand beyond the applications we have today. This article describes some of the motivations and requirements for common core architectures for virtual worlds and introduces a track of articles that aim to change the way humans interact with the Web and their world.
Autors: Thompson, C.W.;
Appeared in: IEEE Internet Computing
Publication date: Feb 2011, volume: 15, issue:1, pages: 60 - 65
Publisher: IEEE
Full litterature document
 
» NGN packet network synchronization measurement and analysis
Abstract:
As the transport of data across the network relies increasingly on Ethernet/IP methods and less on the TDM infrastructure, the need for packet methods of synchronization transport arises. Evaluation of these new packet methods of frequency and time transport requires new approaches to timing measurement and analysis. This article describes these new packet measurement techniques and introduces some of the new metrics being used for packet timing data analysis.
Autors: Cosart, L.;
Appeared in: IEEE Communications Magazine
Publication date: Feb 2011, volume: 49, issue:2, pages: 148 - 154
Publisher: IEEE
Full litterature document
 
» Noise and Nonlinearity Modeling of Active Mixers for Fast and Accurate Estimation
Abstract:
This paper presents a model of active mixers for a fast and accurate estimation of noise and nonlinearity. Based on closed-form expressions, this model estimates the noise figure, IIP3, and IIP2 of the time-varying mixer by a limited number of time-invariant circuit calculations. The model shows that the decreasing transistor output resistance, together with the low supply voltage in deep-submicrometer technologies, significantly contributes to the flicker-noise leakage. Design insights for low flicker noise are then presented. The model also shows that the slope of the LO signal has a significant effect on IIP2, while it has a little effect on IIP3. A new IP2 calibration technique using slope tuning is presented.
Autors: Cheng, W.;Annema, A. J.;Croon, J. A.;Nauta, B.;
Appeared in: IEEE Transactions on Circuits and Systems I: Regular Papers
Publication date: Feb 2011, volume: 58, issue:2, pages: 276 - 289
Publisher: IEEE
Full litterature document
 
» Noise and Recording Properties of Barium-Ferrite Particulate Media Studied by Micromagnetic Modeling
Abstract:
We study noise and recording properties of nonoriented barium-ferrite particulate media using micromagnetic modeling. The packing and orientation distribution of the barium ferrite particles are reproduced very well with our packing algorithm. The distribution of switching fields is determined from experimental hysteresis loops. Using these parameters, we perform recording simulations of periodic waveforms written at various frequencies and extract broad-band signal-to-noise ratio (BB-SNR). Comparison to experimental measurements shows very similar signal and noise characteristics, with however a 6 dB offset in BB-SNR values. Other (e.g., mechanical) noise sources would need to be included in the simulations to account for the difference. Nevertheless, the simulations prove very useful to understand and quantify how particle and media parameters contribute to the signal-to-noise ratio. For the present nonoriented particulate medium, we verify that the particle volume distribution affects the noise power according to the existing analytical expression for particulate noise. The particle anisotropy distribution is found to significantly affect the signal roll-off. The related variation in BB-SNR is found to be in good quantitative agreement with experiments. The effects of other parameters on BB-SNR, such as dipolar coupling, medium thickness, and average head-medium spacing, are also presented. An analytical slope model is proposed for nonoriented media that reproduces the simulations and experimental data very well.
Autors: Jubert, P.-O.;Biskeborn, B.;Qiu, D.;Matsumoto, A.;Noguchi, H.;Shimizu, O.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Feb 2011, volume: 47, issue:2, pages: 386 - 394
Publisher: IEEE
Full litterature document
 
» Noise Benefits in Quantizer-Array Correlation Detection and Watermark Decoding
Abstract:
Quantizer noise can improve statistical signal detection in array-based nonlinear correlators in Neyman-Pearson and maximum-likelihood (ML) detection. This holds even for infinite-variance symmetric alpha-stable channel noise and for generalized-Gaussian channel noise. Noise-enhanced correlation detection leads to noise-enhanced watermark extraction based on such nonlinear detection at the pixel or bit level. This yields a noise-based algorithm for digital watermark decoding using two new noise-benefit theorems. The first theorem gives a necessary and sufficient condition for quantizer noise to increase the detection probability of a constant signal for a fixed false-alarm probability if the channel noise is symmetric and if the sample size is large. The second theorem shows that the array must contain more than one quantizer for such a stochastic-resonance noise benefit if the symmetric channel noise is unimodal. It also shows that the noise-benefit rate improves in the small-quantizer noise limit as the number of array quantizers increases. The second theorem further shows that symmetric uniform quantizer noise gives the optimal rate for an initial noise benefit among all finite-variance symmetric scale-family noise. Two corollaries give similar results for stochastic-resonance noise benefits in ML detection of a signal sequence with known shape but unknown amplitude.
Autors: Patel, A.;Kosko, B.;
Appeared in: IEEE Transactions on Signal Processing
Publication date: Feb 2011, volume: 59, issue:2, pages: 488 - 505
Publisher: IEEE
Full litterature document
 
» Noise Characterization of Midwave Infrared InAs/GaSb Superlattice pin Photodiode
Abstract:
We report on noise characterization of a midwave infrared (MWIR) InAs/GaSb superlattice (SL) single detector. The SL structure was made of eight InAs monolayers (MLs) and eight GaSb MLs, with a total thickness of 2 (440 SL periods). This structure exhibits a cut-off wavelength of 4.8 at 77 K. Extracted from current–voltage characteristics, zero-bias resistance area product above at 80 K was measured. Noise measurements were also performed under dark conditions. The measurements reveal the absence of noise above 30 Hz. Moreover, the detector under test remains Schottky noise-limited up to a bias voltage of 200 mV typically, which confirms the quality of the MWIR SL pin photodiode.
Autors: Jaworowicz, K.;Ribet-Mohamed, I.;Cervera, C.;Rodriguez, J. B.;Christol, P.;
Appeared in: IEEE Photonics Technology Letters
Publication date: Feb 2011, volume: 23, issue:4, pages: 242 - 244
Publisher: IEEE
Full litterature document
 
» Noise gradient reduction based on morphological dual operators
Abstract:
Noise gradient is reduced while image details gradient is also reduced by a filter. For the image corrupted by impulse noise, a novel approach of noise gradient reduction is proposed based on a pair of morphological dual operators. The noise image is filtered by a pair of morphological dual operators respectively, and then the two filtered images are provided with the complementary characteristics of the noise gradient position. This feature results from the unsymmetric behaviour of the pair of morphological dual operators, and it can be applied to reduce the noise gradient effectively. This approach is presented in detail and the experimental results show that the approach not only reduces noise gradient effectively, but also maintains image details gradient. Compared with the classical morphological dual operators, the generalised morphology dual operators have smaller root mean square error on the premise of the close computation and time.
Autors: Lei, T.;Fan, Y.-Y.;
Appeared in: IET Image Processing
Publication date: Feb 2011, volume: 5, issue:1, pages: 1 - 17
Publisher: IEEE
Full litterature document
 
» Noise-induced effects in magnetization reversal and chirality control of circular array of single-domained nanomagnets
Abstract:
The effect of noise on the process of high-speed remagnetization of vortex state of a pentagonal array of five circular magnetic nanoparticles is studied by means of computer simulation of Landau–Lifshits model. The mean switching time (MST) and its standard deviation (SD) of the reversal between the counterclockwise and clockwise vorticities have been computed. It has been demonstrated that with the reversal by the pulse with sinusoidal shape, the optimal pulse duration exists, which minimizes both the MST and the SD. Besides, both MST and SD significantly depend on the angle between the reversal magnetic field and pentagon edge, and the optimal angle roughly equals 10°. Also, it is demonstrated that the optimization of the angle, duration and the amplitude of the driving field leads to significant decrease in both MST and SD. In particular, for the considered parameters, the MST can be decreased from 60 ns to 2–3 ns. Such a chain of magnetic nanoparticles can effectively be used as an element of magnetoresistive memory, and at the temperature 300 K the stable operation of the element is observed up to rather small size of nanoparticles with the radius of 20 nm.
Autors: Pankratov, A. L.;Vdovichev, S. N.;Nefedov, I. M.;Karetnikova, I. R.;
Appeared in: Journal of Applied Physics
Publication date: Feb 2011, volume: 109, issue:3, pages: 033906 - 033906-4
Publisher: IEEE
Full litterature document
 
» Non-destructive thickness characterization of Si based heterostructure by X-ray diffraction and reflectivity
Abstract:
image

Autors:

Graphical abstract

 Graphical abstract:  Highlights: ? High-resolution X-ray diffraction rocking curve (RC), X-ray reflectivity (XRR) and transmission electron microscopy (TEM) are used to characterize the Si based heterostructures. The relia
Appeared in: Solid-State Electronics
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Non-Iterative Method for Modeling Systematic Data Errors in Power System Risk Assessment
Abstract:
This paper provides a new framework for modeling uncertainty in the input data for power system risk calculations, and the error bars that this places on the results. Differently from previous work, systematic error in unit availability probabilities is considered as well as random error, and a closed-form expression is supplied for the error bars on the results. This closed-form expression reveals the relative contribution of different sources of error much more transparently than iterative methods. The new approach is demonstrated using the thermal units connected to the Great Britain transmission system. The availability probabilities used are generic type availabilities, published rounded to the nearest 5% by the system operator. Very wide error bars on the results of risk calculations result from the use of these probabilities; however, this is only revealed by modeling of the systematic error caused by the rounding. The approach is also used to investigate quantitatively the widely acknowledged view that comparing relative risks is a more robust use of simulated risk indices than stating absolute risk levels.
Autors: Dent, C. J.;Bialek, J. W.;
Appeared in: IEEE Transactions on Power Systems
Publication date: Feb 2011, volume: 26, issue:1, pages: 120 - 127
Publisher: IEEE
Full litterature document
 
» Nonisolated High Step-Up Stacked Converter Based on Boost-Integrated Isolated Converter
Abstract:
To obtain a high step-up gain with high efficiency in nonisolated applications, a high step-up technique based on isolated-type converters is introduced in this paper. By stacking the secondary side of an isolated converter in addition to its primary side, a high step-up conversion ratio and a distributed voltage stress can be achieved. Moreover, a careful choice of an isolated converter can provide zero-voltage switching, continuous input current, and reduced reverse recovery on diodes. Based on a conventional voltage-doubler-rectifier boost-integrated half-bridge converter, the derived converter satisfies all these features, which make it suitable for high step-up applications. The operational principle and characteristics of the proposed converter are presented, and verified experimentally with a 135-W, 24-V input, 250-V output prototype converter for a LED driver.
Autors: Park, K.-B.;Moon, G.-W.;Youn, M.-J.;
Appeared in: IEEE Transactions on Power Electronics
Publication date: Feb 2011, volume: 26, issue:2, pages: 577 - 587
Publisher: IEEE
Full litterature document
 
» Nonlinear current-mode controller for DC/DC boost power converters
Abstract:
A new nonlinear current-mode controller is presented for DC/DC boost power converters. This controller comprises a linear feedback of the inductor current and a nonlinear feedback of the output voltage. Experimental results demonstrate the effectiveness of the controller.
Autors: Wu, Z.;Liu, C.-H.;
Appeared in: Electronics Letters
Publication date: Feb 2011, volume: 47, issue:3, pages: 209 - 211
Publisher: IEEE
Full litterature document
 
» Nonlinear electric flow across parallel plates
Abstract:
The electric current flowing across two parallel plates that touch each other over a circular contact is calculated. The change in the physical properties due to temperature rise caused by Joule heating is taken into account so that the current is not linearly proportional to the voltage difference. The resistance is calculated and an accurate approximation for the resistance, based on minimizing the power, is presented.
Autors: Reza Haj Mohammad, Jafar , John R., Dryden
Appeared in: International Journal of Engineering Science
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Nonlinear gray-box identification using local models applied to industrial robots?
Abstract:
In this paper, we study the problem of estimating unknown parameters in nonlinear gray-box models that may be multivariable, nonlinear, unstable, and resonant at the same time. A straightforward use of time-domain predication-error methods for this type of problem easily ends up in a large and numerically stiff optimization problem. We therefore propose an identification procedure that uses intermediate local models that allow for data compression and a less complex optimization problem. The procedure is based on the estimation of the nonparametric frequency response function (FRF) in a number of operating points. The nonlinear gray-box model is linearized in the...
Autors: Erik, Wernholt , Stig, Moberg
Appeared in: Automatica
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Nonsynchronized-State Estimation of Multichannel Networked Nonlinear Systems With Multiple Packet Dropouts Via T–S Fuzzy-Affine Dynamic Models
Abstract:
This paper investigates the problem of robust state estimation for a class of multichannel networked nonlinear systems with multiple packet dropouts. The nonlinear plant is represented by Takagi–Sugeno (T–S) fuzzy-affine dynamic models with norm-bounded uncertainties, and stochastic variables with general probability distributions are adopted to characterize the data missing phenomenon in output channels. The objective is to design an admissible state estimator guaranteeing the stochastic stability of the resulting estimation-error system with a prescribed disturbance attenuation level. It is assumed that the plant premise variables, which are often the state variables or their functions, are not measurable so that the estimator implementation with state-space partition may not be synchronized with the state trajectories of the plant. Based on a piecewise-quadratic Lyapunov function combined with S -procedure and some matrix-inequality-convexifying techniques, two different approaches are developed to robust filtering design for the underlying T–S fuzzy-affine systems with unreliable communication links. All the solutions to the problem are formulated in the form of linear-matrix inequalities (LMIs). Finally, simulation examples are provided to illustrate the effectiveness of the proposed approaches.
Autors: Qiu, J.;Feng, G.;Gao , H.;
Appeared in: IEEE Transactions on Fuzzy Systems
Publication date: Feb 2011, volume: 19, issue:1, pages: 75 - 90
Publisher: IEEE
Full litterature document
 
» Normal Factor Graphs and Holographic Transformations
Abstract:
This paper stands at the intersection of two distinct lines of research. One line is “holographic algorithms,” a powerful approach introduced by Valiant for solving various counting problems in computer science; the other is “normal factor graphs,” an elegant framework proposed by Forney for representing codes defined on graphs. We introduce the notion of holographic transformations for normal factor graphs, and establish a very general theorem, called the generalized Holant theorem, which relates a normal factor graph to its holographic transformation. We show that the generalized Holant theorem on the one hand underlies the principle of holographic algorithms, and on the other hand reduces to a general duality theorem for normal factor graphs, a special case of which was first proved by Forney. In the course of our development, we formalize a new semantics for normal factor graphs, which highlights various linear algebraic properties that potentially enable the use of normal factor graphs as a linear algebraic tool.
Autors: Al-Bashabsheh, A.;Mao, Y.;
Appeared in: IEEE Transactions on Information Theory
Publication date: Feb 2011, volume: 57, issue:2, pages: 752 - 763
Publisher: IEEE
Full litterature document
 
» Novel Antenna-Integrated Photodiodes With Strained Absorbers Designed for Use as Terahertz Sources
Abstract:
We present experimental results on the performance of antenna-integrated photodiodes intended for use as photomixers to provide a tunable broadband source of terahertz (THz) radiation. In a balanced strain-absorber structure, we show that the introduction of strain has proved effective in enhancing the performance at frequencies above 500 GHz. A comparison of strained and unstrained devices confirms this claim. These structures are integrated with a range of antennas, including log periodic and slot–horn types, designed for wideband THz emission. Using the devices as photomixers for the outputs from a DFB laser and an external cavity laser in the 1550 nm telecom window, tunable emission is demonstrated over the range from 100 GHz to 1.8 THz.
Autors: Henning, I. D.;Adams, M. J.;Vaughan, M.;Abraham, T.;Sun, Y.;Dyson, A.;Moodie, D. G.;Rogers, D. C.;Cannard, P. J.;Dosanjh, S.;Skuse, M.;Firth, R. J.;
Appeared in: IEEE Journal of Selected Topics in Quantum Electronics
Publication date: Feb 2011, volume: 17, issue:1, pages: 202 - 209
Publisher: IEEE
Full litterature document
 
» Novel Attributes of a Dual Material Gate Nanoscale Tunnel Field-Effect Transistor
Abstract:
In this paper, we propose the application of a dual material gate (DMG) in a tunnel field-effect transistor (TFET) to simultaneously optimize the on-current, the off-current, and the threshold voltage and also improve the average subthreshold slope, the nature of the output characteristics, and immunity against the drain-induced barrier lowering effects. We demonstrate that, if appropriate work functions are chosen for the gate materials on the source side and the drain side, the TFET shows a significantly improved performance. We apply the technique of DMG in a strained double-gate TFET with a high- gate dielectric to show an overall improvement in the characteristics of the device, along with achieving a good on-current and an excellent average subthreshold slope. The results show that the DMG technique can be applied to TFETs with different channel materials, channel lengths, gate-oxide materials, gate-oxide thicknesses, and power supply levels to achieve significant gains in the overall device characteristics.
Autors: Saurabh, S.;Kumar, M. J.;
Appeared in: IEEE Transactions on Electron Devices
Publication date: Feb 2011, volume: 58, issue:2, pages: 404 - 410
Publisher: IEEE
Full litterature document
 
» Novel Family of Single-Stage Three-Level AC Choppers
Abstract:
The capacitor-clamped base cell is presented. Based on the base cell, a novel family of single-stage three-level (TL) ac choppers is proposed. The converters can directly transfer unsteady high ac voltage with distortion into regulated sinusoidal voltage with low THD. The circuit configuration is constituted of a TL converter, and input and output filters. The topological family includes buck, boost, buck–boost, Cuk, Sepic, and Zeta modes. In order to achieve a reliable TL ac–ac conversion, a double transient voltage feedback control strategy of output voltage and the voltage across the clamp capacitor is introduced in this paper. A prototype of a 500 VA 220 V ± 10% 50 Hz ac/180–240 V 50 Hz ac converter is presented with the experimental results to prove that the converters have four improved advantages simultaneously, including the lower voltage stress of power switches, the bidirectional power flow, the low total harmonic distortion of output voltage, and the higher input power factor.
Autors: Li, L.;Yang, J.;Zhong, Q.;
Appeared in: IEEE Transactions on Power Electronics
Publication date: Feb 2011, volume: 26, issue:2, pages: 504 - 511
Publisher: IEEE
Full litterature document
 
» Novel gold cantilever for nano-Raman spectroscopy of graphene
Abstract:
This paper presents the simultaneous topographical and tip-enhanced Raman imaging of single layer and multilayer graphene flakes. The probe tips suitable for tapping mode atomic force microscopy (AFM) and tip-enhanced Raman spectroscopy have been fabricated by flattening Au microwires. The flattened part of the probe provides a flexible cantilever suitable to work in a tapping mode as a force sensor and the electrochemically etched tip works as an optical antena. The enhancement up to 106 of the D and G band of graphene has been observed while control of the tip sample pressure produced the shift in G band wavelenght....
Autors: Valentinas, Snitka , Raul D., Rodrigues , Vitas, Lendraitis
Appeared in: Microelectronic Engineering
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Novel Sub-10-nm Gate-All-Around Si Nanowire Channel Poly-Si TFTs With Raised Source/Drain
Abstract:
We have successfully fabricated novel sub-10-nm gate-all-around Si nanowire (NW) poly-Si TFTs with raised source/drain structure (GAA RSDNW-TFTs). The Si NW dimension is about 7 12 nm. A superior smooth elliptical shape is obtained, for the first time, in the category of poly-Si NW TFTs through the use of a novel fabrication process requiring no advanced lithographic tools. The GAA RSDNW-TFTs exhibit low supply gate voltage (3 V), steep subthreshold swing 99 mV/dec, and high without hydrogen-related plasma treatments. Furthermore, the DIBL of GAA RSDNW-TFTs is well controlled. These improvements can be attributed to the 3-D gate controllability, raised S/D structure, and sub-10-nm Si NW channel. These novel GAA RSDNW-TFTs are, thus, quite suitable for system-on-panel and 3-D IC applications.
Autors: Lu, Y.-H.;Kuo, P.-Y.;Wu, Y.-H.;Chen, Y.-H.;Chao, T.-S.;
Appeared in: IEEE Electron Device Letters
Publication date: Feb 2011, volume: 32, issue:2, pages: 173 - 175
Publisher: IEEE
Full litterature document
 
» Novel Tunable Millimeter-Wave Grating-Gated Plasmonic Detectors
Abstract:
We present the development of tunable, narrow-band plasmonic millimeter wave detectors. The current generation of this class of detector monolithically integrates a 2-D plasmonic absorber and a bolometric sensor in a GaAs/AlGaAs HEMT located at the vertex of a broad-band antenna. Response and transport measurements demonstrate absorption by high-order plasmon modes sensed by the integrated bolometer and with a two order of magnitude improvement in sensitivity and noise equivalent power over prior generations of 2-D plasmonic detectors. We compare these recent results with the state of the art in millimeter and submillimeter wave-detection technology.
Autors: Dyer, G. C.;Aizin, G. R.;Reno, J. L.;Shaner, E. A.;Allen, S. S.;
Appeared in: IEEE Journal of Selected Topics in Quantum Electronics
Publication date: Feb 2011, volume: 17, issue:1, pages: 85 - 91
Publisher: IEEE
Full litterature document
 
» Novel Voltage Trajectory Control for Field-Weakening Operation of Induction Motor Drives
Abstract:
This paper proposes a new voltage trajectory control for the field-weakening operation of induction motor drives. The presented method does not require a lookup table and reduces the parameter sensitivity. Moreover, the dc-link voltage utilization can be extended such that the voltage can reach the hexagon trajectory of the space vector of the voltage. The difference between the switching period and the summation of active switching times for inverter pulsewidth modulation control is used for field-weakening control. As the summation of the active switching times is less than its switching period, constant torque is retained. In contrast, the field-weakening control is considered. Smooth and automatic transition between two field-weakening regions can be achieved by the calculated -axis current subjected to the voltage, current, and maximum pullout torque constraints. Experimental and simulation results will be presented to fully support the claims.
Autors: Lin, P.-Y.;Lai, Y.-S.;
Appeared in: IEEE Transactions on Industry Applications
Publication date: Feb 2011, volume: 47, issue:1, pages: 122 - 127
Publisher: IEEE
Full litterature document
 
» Numerical Analysis of a Rail Launcher With a Multilayered Armature
Abstract:
A new configuration of a rail launcher with a multilayered armature and a multiple system of rails is presented. The aim of the proposed launcher is to improve the current distribution on the armature by contrasting the velocity skin effect that, as known, produces a current concentration on the rear of the armature. This makes it possible to increase the total current on the armature without reaching the melting temperature anywhere. Better performance in terms of launch velocity comes as a consequence. The proposed configuration has been analyzed by using a research computer code; the main characteristics of the launcher are shown, and the most important results are reported. A comparison has been performed with a conventional rail launcher.
Autors: Musolino, A.;
Appeared in: IEEE Transactions on Plasma Science
Publication date: Feb 2011, volume: 39, issue:2, pages: 788 - 793
Publisher: IEEE
Full litterature document
 
» Numerical analysis of packetlike charge behavior in low-density polyethylene by a Gunn effectlike model
Abstract:
Under some conditions, charges may transport like an isolated packet in polyethylene. It has been demonstrated that many factors, such as applied field strength, temperature, and material itself, influence on formation and migration of space charge packet, which cause many difficulties in understanding the general mechanism of the phenomenon. In this paper, based on the analysis about the influences of charge injection, carriers’ migration, and the interaction between the free charge and trap in polyethylene on packetlike space charge behavior, a new physical model is established to give a physical description of packetlike charge behavior in low density polyethylene (LDPE). This model includes some interesting features: (1) it gives an exact calculation of charge changes in all positions of specimens; (2) the negative differential mobility mechanism of Gunn effect in semiconductor is introduced to explain the generating process of space charge packet; (3) field-induced charge detrapping model is utilized to simulate the diversity of packetlike charge packet behavior under different applied fields. By considering such a model, we simulate two kinds of positive packetlike charge behavior in LDPE from different research groups. The simulated results show well fitting with the experiment data.
Autors: Xia, Junfeng;Zhang, Yewen;Zheng, Feihu;An, Zhenlian;Lei, Qingquan;
Appeared in: Journal of Applied Physics
Publication date: Feb 2011, volume: 109, issue:3, pages: 034101 - 034101-9
Publisher: IEEE
Full litterature document
 
» Numerical failure analysis of current-confined-path current perpendicular-to-plane giant magnetoresistance spin-valve read sensors under high current density
Abstract:
Thermomigration (TM)-induced failures occurred in the current-confined-path (CCP) current perpendicular-to-the plane (CPP) giant magnetoresistance spin valve (GMR SV) read sensors with Cu nanopillar metal paths (∼5 nm in diameter) operating at a high current density (J>2×107 A/cm2) have been numerically studied to explore the magnetic and electrical stability. The Cu interdiffusion (migration) from nanopillars into adjacent magnetic layers (e.g., CoFe) due to thermally induced mass transport was found to be the main physical reason for the magnetic failures of CCP-CPP GMR SV read sensors including the change in interlayer coupling and the reduction in exchange bias field as well as MR. Furthermore, it was numerically verified that the TM-induced failures are more dominant than the electromigration-induced failures at the higher current density beyond J=6×107 A/cm2 in the CCP-CPP GMR SV read sensors. However, all the numerical calculation results demonstrated in this study clearly suggest that these undesirable electrical and magnetic failures occurred in the CCP-CPP GMR SV read sensors can be improved by tuning the path density, the purity (electrical resistivity), and the uniformity of Cu nanopillar metal paths.
Autors: Zeng, Ding Gui;Chung, Kyung-Won;Ha, Jae-Geun;Bae, Seongtae;
Appeared in: Journal of Applied Physics
Publication date: Feb 2011, volume: 109, issue:3, pages: 033901 - 033901-7
Publisher: IEEE
Full litterature document
 
» Numerical Investigation on the X-Ray Production of Aluminum-Wire-Array -Pinch Implosion
Abstract:
In this paper, the processes and mechanisms of X-ray production are discussed by numerically investigating a typical aluminum-wire-array -pinch implosion on the S-300 facility. It is shown that the line emission accounts for over 70% of the total radiation, and the continuum including free–free and free–bound transitions occupies less than 30%. In the line emission, most photons are generated from -shell transitions which take place everywhere, while high-energy -shell photons are much fewer and are mainly produced in the interior region, where the electron temperature is relatively high. Corresponding to the variation of plasma conditions in different phases of the implosion, the dominant atomic processes and radiation mechanisms show great difference. In the run-in phase, the ionization and excitation processes dominate with the increase of electron temperature, thus causing a large number of ions in excited states and, in turn, the increase of the line emission. However, the share of the line emission decreases slightly because of the strong self-absorption of lines and much weaker opacity effect on the continuum. At stagnation, the plasma is compressed to the state of high density; three-body recombination plays a key role in determining the populations of ions. Consequently, the populations of some important excited states increase rapidly, resulting in an increase of the share of line emission. After stagnation, the plasma expands, and the electron number density decreases, and the three-body recombination decreases more quickly than the radiation recombination, thus again leading to a gradual decrease in the share of line emission.
Autors: Delong, X.;Ning, D.;Cheng, N.;Shunkai, S.;Yang, Z.;Jun, H.;Chuang, X.;
Appeared in: IEEE Transactions on Plasma Science
Publication date: Feb 2011, volume: 39, issue:2, pages: 686 - 694
Publisher: IEEE
Full litterature document
 
» Numerical modeling of partially filled aircraft fuel tanks submitted to Hydrodynamic Ram
Abstract:
Hydrodynamic Ram (HRAM) is a phenomenon that occurs when a high-kinetic energy object penetrates a fluid-filled container. The projectile transfers its momentum and kinetic energy through the fluid to the surrounding structure, increasing the risk of catastrophic failure and excessive structural damage. This is of particular concern in the design of wing fuel tanks for aircraft since it has been identified as one of the important factors in aircraft vulnerability. Usually the HRAM phenomenon is analyzed considering completely filled tanks, but its effect on partially filled containers should also be taken into account due to the fact that tanks used...
Autors: D., Varas , R., Zaera , J., López-Puente
Appeared in: Aerospace Science and Technology
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Object-Oriented Parallelisation of Java Desktop Programs
Abstract:
This article explores desktop applications' structure and the threading model's limitations while examining the parallelization of a desktop application using object-oriented and GUI-aware concepts.
Autors: Giacaman, N.;Sinnen, O.;
Appeared in: IEEE Software
Publication date: Feb 2011, volume: 28, issue:1, pages: 32 - 38
Publisher: IEEE
Full litterature document
 
» Objective Functions of Online Weight Noise Injection Training Algorithms for MLPs
Abstract:
Injecting weight noise during training has been a simple strategy to improve the fault tolerance of multilayer perceptrons (MLPs) for almost two decades, and several online training algorithms have been proposed in this regard. However, there are some misconceptions about the objective functions being minimized by these algorithms. Some existing results misinterpret that the prediction error of a trained MLP affected by weight noise is equivalent to the objective function of a weight noise injection algorithm. In this brief, we would like to clarify these misconceptions. Two weight noise injection scenarios will be considered: one is based on additive weight noise injection and the other is based on multiplicative weight noise injection. To avoid the misconceptions, we use their mean updating equations to analyze the objective functions. For injecting additive weight noise during training, we show that the true objective function is identical to the prediction error of a faulty MLP whose weights are affected by additive weight noise. It consists of the conventional mean square error and a smoothing regularizer. For injecting multiplicative weight noise during training, we show that the objective function is different from the prediction error of a faulty MLP whose weights are affected by multiplicative weight noise. With our results, some existing misconceptions regarding MLP training with weight noise injection can now be resolved.
Autors: Ho, K.;Leung, C.-S.;Sum, J.;
Appeared in: IEEE Transactions on Neural Networks
Publication date: Feb 2011, volume: 22, issue:2, pages: 317 - 323
Publisher: IEEE
Full litterature document
 
» Observability analysis of electric networks considering branch impedance
Abstract:
 Research highlights: ? The effect of the X to R ratio of branches on network observability is presented. ? The effect of the impedance value of branches on network observability is investigated. ? The X to R ratio of branches has no effect on the observability of every network. ? A new method is developed to study the effect of impedance values on observability. ? A simple method is proposed for branch observability of radial networks.

Autors: This paper presents an analytical method to analyze the effect of X to R ratio as well as impedance value of branches on observability of a network based on un-decoupled formulation of state estimation (SE) and null space of matrices. The results sho
Appeared in: International Journal of Electrical Power & Energy Systems
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» Observability Forms for Switched Systems With Zeno Phenomenon or High Switching Frequency
Abstract:
This technical note deals with the observability of a class of switched systems with Zeno phenomenon or high switching frequency. Particularly, three observability forms are proposed and the observability for each form with knowledge of filtered switching signal is analyzed. Meanwhile, sufficient and necessary conditions for the existence of a diffeomorphism to transform a class of switched systems into one of such forms are presented. Examples and simulations are given at the end to highlight the theoretical results.
Autors: Yu, L.;Barbot, J.-P.;Boutat, D.;Benmerzouk, D.;
Appeared in: IEEE Transactions on Automatic Control
Publication date: Feb 2011, volume: 56, issue:2, pages: 436 - 441
Publisher: IEEE
Full litterature document
 
» Occurrence probability of lightning failure rates at substations in consideration of lightning stroke current waveforms
Abstract:
To estimate lightning stroke overvoltages exactly, the occurrence probability of lightning stroke current waveforms must be accurately evaluated. This paper firstly formulated the occurrence probability distribution of lightning stroke current waveforms, taking into account the correlation between the current amplitude and the front duration. Next, lightning overvoltages were calculated, with the current amplitude and the front duration of lightning current as statistical parameters for Gas Insulated Switchgears (GIS's) and transformers in UHV substations. While overvoltages caused by back-flashovers at GIS's are affected by the front duration of lightning current, overvoltages at transformers are relatively less dependent on the front duration. Finally the failure rate was evaluated by considering not only the current amplitude but also the front duration. These values were smaller than those evaluated from the frequency of occurrence of current amplitude alone. Further, the proposed front duration of 1.7 μs was examined.
Autors: Okabe, S.;Takami, J.;
Appeared in: IEEE Transactions on Dielectrics and Electrical Insulation
Publication date: Feb 2011, volume: 18, issue:1, pages: 221 - 231
Publisher: IEEE
Full litterature document
 
» Oestrus detection in dairy cows from activity and lying data using on-line individual models
Abstract:
 Research highlights: ? Detection of oestrus in dairy cows is reported using novel algorithms and a lying-balance indicator. ? Low-cost sensor information (step count and leg tilt) are combined to obtain efficient detection with high sensitivity (89%) and low error rate (6%). ? Algorithms are provided in the paper. ? They are fully recursive, prior training and learning are not required. ? Ground truth for oestrus is insemination that led to subsequent pregnancy. ?

Autors: Automated monitoring and detection of oestrus in dairy cows is attractive for reasons of economy in dairy farming. While high performance detection has been shown possible using high-priced progesterone measurements, detection results were less relia
Appeared in: Computers and Electronics in Agriculture
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» OFC/NFOEC 2011: Leading the way in optical communications- [Conference preview]
Abstract:
Autors: Basista, L.;
Appeared in: IEEE Communications Magazine
Publication date: Feb 2011, volume: 49, issue:2, pages: s4 - s6
Publisher: IEEE
Full litterature document
 
» Offline Impairment-Aware RWA and Regenerator Placement in Translucent Optical Networks
Abstract:
In translucent optical networks, the physical layer impairments degrading the optical signal are considered in the network planning. In this paper, we investigate the offline problem of routing and wavelength assignment (RWA) and regenerator placement (RP) in translucent networks, minimizing the lightpath blocking and regenerator equipment cost. We address two variants of the problem, which correspond to two different types of quality of transmission (QoT) estimators, called linear and nonlinear. In a nonlinear QoT, nonlinear impairments like crosstalk or cross-phase modulation, which account for the interferences from neighboring lightpaths in the network are explicitly computed. Then, the QoT estimated for a lightpath depends on the routes of other lightpaths in the network. In the linear QoT, the effects of the nonlinear impairments are overestimated and accumulated to the rest of the impairments in the QoT calculation. As a result, the QoT estimation of a lightpath solely depends on its route.
Autors: Garcia-Manrubia, B.;Pavon-Marino, P.;Aparicio-Pardo, R.;Klinkowski, M.;Careglio, D.;
Appeared in: Journal of Lightwave Technology
Publication date: Feb 2011, volume: 29, issue:3, pages: 265 - 277
Publisher: IEEE
Full litterature document
 
» On a class of generalized eigenvalue problems and equivalent eigenvalue problems that arise in systems and control theory?
Abstract:
Systems and control theory has long been a rich source of problems for the numerical linear algebra community. In many problems, conditions on analytic functions of a complex variable are usually evaluated by solving a special generalized eigenvalue problem. In this paper we develop a general framework for studying such problems. We show that for these problems, solutions can be obtained by either solving a generalized eigenvalue problem, or by solving an equivalent eigenvalue problem. A consequence of this observation is that these problems can always be solved by finding the eigenvalues of a Hamiltonian (or discrete-time counterpart) matrix, even...
Autors: Martin, Corless , Robert, Shorten
Appeared in: Automatica
Publication date: Feb 2011
Publisher: Elsevier B.V.
Full litterature document
 
» On Angle References in Long-Term Time-Domain Simulations
Abstract:
In power system dynamic models, the complex network equations and the various phasors are projected onto reference axes. After a short critical review of commonly chosen reference axes, this letter proposes to use the center-of-inertia at the previous integration time step. This approach is shown to combine the advantages of the center-of-inertia with a sparser Jacobian structure and an easier handling of network splits.
Autors: Fabozzi, D.;Van Cutsem, T.;
Appeared in: IEEE Transactions on Power Systems
Publication date: Feb 2011, volume: 26, issue:1, pages: 483 - 484
Publisher: IEEE
Full litterature document
 
» On Cell Layout-Performance Relationships in VeSFET-Based, High-Density Regular Circuits
Abstract:
In this paper, we study circuits implemented using high-density arrays composed of vertical slit field effect transistors. This layout style could dramatically increase transistor density and, therefore, reduce fabrication cost. However, its geometrical restrictions, imposed by the super-regular transistor arrangement and strictly parallel metal tracks, pose new design challenges. Our experiments reveal that very dense cell-level interconnect pattern may be responsible for unnecessary 15% increase of the circuit level, critical path delays. We demonstrate that these extra delays can be avoided by constructing appropriate cell interconnect layouts and by more flexible usage of available metal layers for intra-cell routing. To balance the performance and metal layer usage, we propose a linear programming-based technique for critical net re-routing.
Autors: Lin, Y.-W.;Marek-Sadowska, M.;Maly, W. P.;
Appeared in: IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Publication date: Feb 2011, volume: 30, issue:2, pages: 229 - 241
Publisher: IEEE
Full litterature document
 
» On Combining Computer-Aided Detection Systems
Abstract:
Computer-aided detection (CAD) is increasingly used in clinical practice and for many applications a multitude of CAD systems have been developed. In practice, CAD systems have different strengths and weaknesses and it is therefore interesting to consider their combination. In this paper, we present generic methods to combine multiple CAD systems and investigate what kind of performance increase can be expected. Experimental results are presented using data from the ANODE09 and ROC09 online CAD challenges for the detection of pulmonary nodules in computed tomography scans and red lesions in retinal images, respectively. For both applications, combination results in a large and significant increase in performance when compared to the best individual CAD system.
Autors: Niemeijer, M.;Loog, M.;Abramoff, M. D.;Viergever, M. A.;Prokop, M.;van Ginneken, B.;
Appeared in: IEEE Transactions on Medical Imaging
Publication date: Feb 2011, volume: 30, issue:2, pages: 215 - 223
Publisher: IEEE
Full litterature document
 
» On Ex Post Pricing in the Real-Time Electricity Market
Abstract:
This paper proposes a new framework in calculating the ex post prices for the spot electricity market. The proposed method finds a set of prices that are as consistent as possible with the actual outputs of resources correctly following their dispatch instructions. Two alternative consistency metrics are proposed in the paper. One measures the difference between the actual performance of an individual resource and its bid-based profit-maximizing response to the ex post prices in a perfectly competitive market. Another measures the difference between the ex post price and the price that supports the actual response of an individual resource. Compared to the existing approaches adopted in the real-time electricity markets in the U.S., the proposed method solves the ex post energy and ancillary service prices directly and simultaneously. It does not require heuristics that are hard to justify, and has a much clear definition for the pricing problem than the existing approaches do. Moreover, the proposed approach is flexible in the price control required by the market operators. Numerical examples are presented to further demonstrate the validity of this approach.
Autors: Zheng, T.;Litvinov, E.;
Appeared in: IEEE Transactions on Power Systems
Publication date: Feb 2011, volume: 26, issue:1, pages: 153 - 164
Publisher: IEEE
Full litterature document
 


Publication archives by date
    2014:   January     February     March     April     May     June     July     August     September     October     November     December    
    2013:   January     February     March     April     May     June     July     August     September     October     November     December    
    2012:   January     February     March     April     May     June     July     August     September     October     November     December    
    2011:   January     February     March     April     May     June     July     August     September     October     November     December    
    2010:   January     February     March     April     May     June     July     August     September     October     November     December    
    2009:   January     February     March     April     May     June     July     August     September     October     November     December