Digital signal processing with applications: a new and successfulapproach to undergraduate DSP education

The new approach to undergraduate digital signal processing education at Purdue is based on a simple idea: emphasize applications. Students are assumed to have a significant exposure to sampling and discrete-time signals, systems, and transforms at the junior level. In the senior course, the traditional digital signal processing topics of digital filter design, the discrete Fourier transform (DFT), radix-2 fast Fourier transforms (FFTs), and quantization are covered in the first five weeks of the semester. Coverage of these topics is augmented by treatment in the laboratory component of the course using diverse software tools and by Matlab-based homework assignments. The remainder of the course is devoted to treating the topics of speech processing and image processing in substantial depth and involves a design project. The course has been very successful in terms of increasing enrolment and outstanding student evaluations     

Current differential amplifiers: new circuits and applications

New CMOS current differential amplifiers are proposed suitable for analogue signal processing at high frequencies. They consist of simple current mirrors, which are easy to design and to implement in IC form. Low‐voltage low‐power design is feasible. Relying on these devices a number of applications are obtained, including lossy and lossless integrators, simulated inductors, active filters, and harmonic oscillators. Theoretical expressions are given for all of the proposed new circuits. The verification of the circuits is also achieved by simulation. Copyright 2001 © John Wiley & Sons, Ltd.     

A new impedance-transformation property and its applications to switching-diode Q-factor measurements

A new property of impedance transformation is presented that can be applied to semiconductor switching-diode Q factor measurements. The only parameter that must be known for the diode holder and the diode package is the efficiency of the energy transmission from the source of the signal to the semiconductor junction.     

On a family of new two-op-amp switched-capacitor biquads for high-frequency applications

This paper presents three novel biquads derived by applying the concept of so-called basic elements for switched-capacitor (SC) circuits. These biquads are without continuous feedback and comprise two op-amps. They were derived assuming a transfer function denominator of the same form as the Fleischer-Laker type E circuit. It is shown that by a simple modification of the switching arrangement, i.e. by changing the type of the basic SC element, the effect of the amplifier finite gain on the performance of SC filters can be significantly reduced. the efficiency of this approach has been established by extensive simulation studies using the dedicated symbolic analysis program SCYMBAL. Design equations and comparison with already known biquads of this type are presented. Examples are provided to demonstrate that the proposed circuits require a low total capacitance while finite-gain effects are considerably reduced.     

Transport calculationof Semiconductor Nanowires Coupled to Quantum Well Reservoirs

Semiconductor nanowires are possible candidates to replace the metal-oxide-semiconductor field-effect transistors (MOSFET) since they can act both as active devices or as device connectors. In this article, the transmission coefficients of Si and GaAs nanowires with arbitrary transport directions and cross sections are simulated in the nearest-neighbor sp³d⁵s* semi-empirical tight-binding method. The open boundary conditions (OBC) are calculated with a new scattering boundary method where a normal eigenvalue problem of reduced size is solved. Two different types of contacts are studied. In the ideal case, semi-infinite reservoirs (the source and the drain) that are the prolongation of the device are assumed. In a more realistic configuration, the active nanowire is embedded between two quantum well (QW) reservoirs. The electrical properties of the device are obtained by a non-equilibrium Green’s function (NEGF) calculation.     

UPS applications: a mill perspective

This article results from the experience of installing a number of uninterruptible power supply (UPS) systems for various projects. It attempts to describe typical applications in a pulp and paper mill, determines how to evaluate whether a UPS system should be used, and suggests some alternative approaches to the problem. There are several types of UPS configurations available. Although rotating types are extensively used, the static type is more prevalent and is the basis for most of the discussion. Many applications have potential problems with power quality and availability. Factors are listed that will help determine whether a UPS system should be installed. Typical applications in pulp and paper mills are listed and discussed. Problems from some actual installations are described and alternative approaches are examined. Power quality and availability is a design consideration that requires careful attention to achieve the desired result. It will be more important in the future as utility power systems become less reliable     

测试领域新技术的发展及应用

随着测试需求的提高,在测试领域中新的技术得到了快速的发展,追踪研究这些新技术,对于我国研制新的先进测试系统具有一定的借鉴作用。本文首先详细介绍了近年来在测试领域中出现的新技术,包括测试仪器及先进的测试总线技术,自动化测试及综合测试技术,故障诊断及综合保障技术的发展状况及其应用。着重介绍了合成仪器技术,LXI总线技术,柔性测试技术和智能测试诊断技术。最后指出测试新技术为我国测试领域的发展带来了机遇和挑战。     

Design and implementation of a new high step-up DC-DC converter for renewable applications

In this paper, a new structure for a DC-DC boost converter is proposed. The presented converter provides a high voltage transfer gain with lower duty cycle. Low current and low voltage stress on the switch, enlarged area of operating in continuous conduction mode (CCM), reduced size of the inductors, and the input filter are the main advantages of the proposed converter. The high voltage transfer gain with low number of elements has made it suitable to implement. Hence, using only one switch has made the control of the proposed converter easy. Besides, decreased switching losses and higher efficiency are obtained. The proposed structure is a combination of the Luo converter and a booster unit, which its analysis is studied in three modes, CCM, boundary conduction mode (BCM), and discontinuous conduction mode (DCM). Furthermore, in order to validate the analysis and feasibility of the proposed converter, the experimental results are developed on a low power prototype.     

Supercomputing in molecular biology: applications to sequenceanalysis

Genetic data, accumulating at a rapid pace, are ideally suited to computer analysis. These data pose problems of a magnitude that requires supercomputing. The National Cancer Institute of the US National Institutes of Health (NIH) has developed the Advanced Scientific Computing Laboratory to utilize these data for basic research of relevance to cancer and other diseases. The facility and its use for several research problems of biomedical importance are discussed below. The problems considered are sequence comparisons, nucleic acid second structure prediction, Monte Carlo tests, molecular dynamics, and drug design. Computer time in spent various areas of research is summarized.     

A new hybrid current sensor for high-voltage applications

This article presents a new hybrid electro-optic/inductive current sensor for metering and protective relaying applications. The sensor combines a Rogowski coil with a passive integrator located in the high-voltage environment. An integrated-optic Pockels cell (IOPC) having integrated electrodes provides optical isolation. Test results from 30 A to 30 kA show the sensor to be highly linear, exceeding 0.2% linearity standards. Temperature cycling tests show the ratio error to have a maximum value of 0.3% over the -30 to +70/spl deg/C range.     

Atomic force microscopy: a new way to look at chromatin

This article deals with the application of a new form of microscopy, atomic force microscopy or AFM, to the study of chromatin structure. The main advantage of AFM is that it can operate at subnanometer resolution in aqueous fluids. It has been applied successfully to study of the structural dynamics of cells and molecules. However, thus far most of the AFM work on chromatin has been limited to studies performed in ambient air environments. Even when working in ambient air, AFM offers a number of important advantages over other microscopic techniques: (1) sample preparation is simple, e.g., no stains or metal coatings need to be applied to the specimen; (2) without coatings or stains present, AFM measurements can be made directly on the natural surface of the specimen; (3) imaging can be performed in humid environments where biological specimens remain hydrated with bound water molecules; and (4) the spatial resolution of AFM is sufficient to allow clear visualization of individual nucleosomes and linker DNA     

A new MRI formulation for flow and motion applications

A rigorous reformulation of the magnetic resonance (MR) image formulation model (IFM) can use the integrally cumulative nature of MRI phase shifts for encoding and of time-of-flight travel corrections for magnitude. This approach characterizes each independent gradient element by its cumulant waveforms,K _N (t), instead of by particular time expansion in gradient moments. The lowest-order cumulant gradient that gives a simple monopolar waveform governs all resulting phase-encoding properties. Each gradient element specifically encodes one and only one motion-order variable. Phase sensitizations to higher order do not exist; they are mathematical psuedophasings. Magnetization isochromats may have arbitrarily complicated velocity history,V(t), appearing in both time-of-flight and motion phase-shift formulas. The subject's intravoxel motion subdistributions each automatically reference the correct mean time of encoding action and its encoding duration. This formulation yields very simple and generalizable IFM expressions for MRI acquired data, with no theoretical confusion regarding higher-order phase shifts and nonphased time-of-flight effects.     

Dielectric pocket double gate junctionless FET: a new MOS structure with improved subthreshold characteristics for low power VLSI applications

In this paper, we report the TCAD based simulation of a new double-gate junctionless FETs (DG-JLFETs) structure incorporating dielectric pockets (DPs) at the source and drain ends. The proposed structure not only improves the ON to OFF drain current ratio (by \({\sim }\)900 %), subthreshold swing characteristics (by \({\sim }\)12 %) and Drain Induced Barrier Lowering (DIBL) (by \({\sim }\)56 %) over the conventional DG-JLFETs (i.e. without DPs), but also provides additional flexibility of performance optimization of the device by changing the length and thickness of the DPs. Since only little work has been carried out on the performance optimization of the JLFETs, the present work is believed to be very useful for designing the low-power VLSI circuits using DP-DG JLFETs with improved performance.     

A new methodology for the identification of PD in electrical apparatus: properties and applications

Applications of a new methodology, aimed at the identification of defects occurring in insulation systems of HV apparatus and based on partial discharge (PD) measurements, are presented in this paper. This methodology relies upon the digital acquisition of a large amount of PD pulses and separates the acquired pulses into homogeneous subclasses. Signal processing tools recognize the presence of noise among the different classes. Identification of basic PD source typologies (i.e., internal, corona and surface discharges) is then achieved, resorting to fuzzy algorithms. The proposed procedure is applied to measurements performed on different HV apparatus, such as cables, transformers and rotating machines. The purpose of this paper is to show that the identification process is robust, regarding the measuring circuit, and flexible, so that it can constitute an advanced tool for condition based maintenance, guiding maintenance experts in making decisions on the condition of the insulation system under test.     

新型系列少胶粉云母带的应用

论文介绍丹阳市绝缘材料厂生产的新型系列少胶粉云母带的性能和在铁路牵引电机、高压电机、感应电机的应用情况。     

新一代可伸缩视频编码标准:背景、特征、技术及其应用

SHVC是高效视频编码(HEVC)标准的可伸缩扩展,它的最新版本于2015年上半年由ISO/IEC和ITU-T同时发布。HEVC的第1版已经支持时间可伸缩性,除此之外SHVC又进一步提供了空间、质量、位深和色域的可伸缩性,以及这些可伸缩性之间的任意组合。在实际应用中,通过对视频服务系统的环境信息进行测量和感知,相应地调整服务参数,对具有可伸缩性的码流进行传输和解码。SHVC架构设计使其可以通过使用多个单层HEVC编解码器核心而实现,此外SHVC还添加了层间参考图像处理模块。本文将着重介绍包括纹理、运动重采样和颜色映射在内的层间参考图像处理模块的有关理论和实现方案。     

上海电网新技术应用展望

随着上海高新技术企业的发展和信息化社会的建设，用户对电能质量提出了更高的要求；上海电网目前的输电走廊和变电站选址已经非常困难，电网建设也常因此受到影响；在厂网分离的条件下，电网的安全稳定运行也面临着巨大的挑战。面临这些挑战，对上海电网的技术要求也就更高了。在介绍上海电网的现状、分析电网的特点和所面临的问题基础上，从上海电网的实际和需求出发，对大容量交直流输电技术、灵活交流输电技术、信息管理技术、全寿命周期管理等新技术在上海电网中的应用前景作了展望，这些技术涵盖了电力系统的规划、建设、运行和管理等多个方面，对上海电网发展和新技术应用有指导意义。     

A fast realization of new Mersenne number transformation and its applications

The new Mersenne number transform (NMNT) can be realized by the fast Fourier transform (FFT) with power-of-two length, which results in great flexibility in real-world fixed-point computations, such as the convolution-based signal processing in the embedded device. Yet the FFT realization exists the truncation errors and in order to further reduce the computations, this paper puts forward a novel realization structure for the NMNT, where the Walsh-Hadamard transform (WHT) is employed to accelerate the NMNT computation. Moreover, we also propose the refined computing structure using the matrix decomposition and multiple constant multiplication (MCM), and then all multiplications can be replaced by the shift-addition operations without precision loss. Besides, the use of lookup table (LUT) to reduce the complexity is also discussed in our study. A typical convolution application is tested by computer simulations, while the result demonstrates that the proposed scheme produces precise computing results with reduced complexity.