Generating a PRSA with triangular symmetry

This paper presents a sequence of pseudorandom arrays with triangular symmetry. The sequence of arrays is also pseudorandom in nature, so it can be called a pseudorandom sequence of arrays, or PRSA. A circuit for the PRSA generator is given and some interesting properties of this type of PRSA are discussed. Also, some of the concepts presented in this paper are clarified with an example.     

Analysis of a PRSA generator

The pseudorandom sequence of arrays (PRSA) and a method to generate it was reported earlier by the authors. This paper presents another method to generate a PRSA. The mathematical recursion describing the PRSA and some of its properties are discussed.     

Studies of Carbides in a Rapidly Solidified High-Speed Steel

Rapid solidification by electron beam surface melting of a Mo-base high-speed steel (M7) has produced microstructural features different from those observed in the conventionally processed material. As a result of rapid solidification, the volume percent of the carbide phases formed has decreased sharply and has resulted in the formation of M₂C and M₂₃C₆ carbide phases, while in the conventionally processed material, M₆C and MC carbides were present. Microanalysis of the extracted carbides formed by electron beam melting has yielded an intriguing finding. M₂₃C₆ is found to be unusually rich in molybdenum, tungsten, and vanadium; the concentration of (Mo + W), for instance, is approximately 60 wt pct. The corresponding values for Fe and Cr are surprisingly low (6 wt pct Cr and 1 wt pct Fe). This is in marked contrast with carbides encountered in the conventionally processed high-speed steel, where Cr and Fe are the major constituents. The shift in composition of the carbide phases could be attributed to the accelerated evaporation of chromium during surface melting as compared to the evaporation of Mo, W, and V. formerly Research Associate, University of Connecticut     

Efficient Numerical Scheme for Solving Large System of Nonlinear Equations

A fifth-order family of an iterative method for solving systems of nonlinear equations and highly nonlinear boundary value problems has been developed in this paper. Convergence analysis demonstrates that the local order of convergence of the numerical method is five. The computer algebra system CAS-Maple, Mathematica, or MATLAB was the primary tool for dealing with difficult problems since it allows for the handling and manipulation of complex mathematical equations and other mathematical objects. Several numerical examples are provided to demonstrate the properties of the proposed rapidly convergent algorithms. A dynamic evaluation of the presented methods is also presented utilizing basins of attraction to analyze their convergence behavior. Aside from visualizing iterative processes, this methodology provides useful information on iterations, such as the number of diverging-converging points and the average number of iterations as a function of initial points. Solving numerous highly nonlinear boundary value problems and large nonlinear systems of equations of higher dimensions demonstrate the performance, efficiency, precision, and applicability of a newly presented technique.     

Preparation of antimicrobial sutures by preirradiation grafting of acrylonitrile onto polypropylene monofilament. II. Mechanical,physical, and thermal characteristics

Polypropylene‐g‐polyacrylonitrile sutures were prepared by graft polymerization of acrylonitrile onto polypropylene monofilament by preirradiation method. Sutures with various graft levels were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Density, Birefriengence, X‐ray Diffraction, Scanning Electron Microscopy (SEM), and Differential Scanning Calorimetry (DSC). Mechanical properties of the unmodified and grafted sutures were also evaluated. The physical characteristics of sutures were markedly affected by the graft levels. Density of the polypropylene sutures increased with an increased in the degree of grafting. The heat of fusion and heat of crystallization decreased with the increase in the degree of grafting. X‐ray diffraction also revealed decrease in crystallinity with the increase in the graft levels. Tenacity of the monofilament improved, whereas the elongation at break decreased in grafted samples. Scanning electron microscopy showed significant variation in surface morphology in the grafted samples. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1224–1229, 2004     

稻壳纤维粒径和掺量分数对水泥复合材料性能的影响

以稻壳纤维（Rice husk fiber,RHF）为增强材料,以水泥为基体,制备了RHF/水泥基复合材料。研究了粒径对RHF在水泥基体中分散性能的影响;并以RHF粒径和掺入质量比为考察因素,采用响应曲面法,以RHF/水泥基复合材料的密度、抗折强度、含水率、吸水率和导热系数为响应值,建立数学模型,对RHF/水泥基复合材料的成型工艺进行优化设计。结果表明：RHF的粒径越小,在水泥基体中分散性能越好,粒径为150 μm的RHF分散系数达到最大值,为0.981;响应曲面模型分析表明RHF的粒径为150 μm、掺入质量为水泥质量的3%时,RHF/水泥基复合材料的性能达到最优,此时RHF/水泥基复合材料的密度为1 559.26 kg/m³,抗折强度为9.38 MPa,含水率为7.05%,吸水率为16.71%,导热系数为0.50 W/（m·K）,达到了建筑行业标准JC/T 411-2007的要求。     

应用于片上网络的容错机制

本文提出了一整套容错机制来解决片上网络通信中遇到的故障.对于暂时性故障,使用端对端的硬件重传机制;时于永久性故障,使用软硬件结合的方法进行故障的检测、诊断和修复.仿真显示,该容错机制能够比较全面的对故障进行处理.本论文还对提出的容错路由器和容错网络接口进行了硬件设计,在0.13 μm工艺下,两个通信组件的面积仅0.12 mm2和0.46 mm2,相对于没有容错功能的路由器和网络接口,面积仅增加0.145 mm2.     

Cloud-based video analytics using convolutional neural networks

Object classification is a vital part of any video analytics system, which could aid in complex applications such as object monitoring and management. Traditional video analytics systems work on shallow networks and are unable to harness the power of distributed processing for training and inference. We propose a cloud-based video analytics system based on an optimally tuned convolutional neural network to classify objects from video streams. The tuning of convolutional neural network is empowered by in-memory distributed computing. The object classification is performed by comparing the target object with the prestored trained patterns, generating a set of matching scores. The matching scores greater than an empirically determined threshold reveal the classification of the target object. The proposed system proved to be robust to classification errors with an accuracy and precision of 97% and 96%, respectively, and can be used as a general-purpose video analytics system.     

An improved surveillance video forgery detection technique using sensor pattern noise and correlation of noise residues

Multimedia Tools and Applications - Digital videos have become an important aspect of our lives lately, from a personal memorable to surveillance videos which can be presented in a court as an...     

Reconfigurable Compact Wideband Circularly Polarised Dielectric Resonator Antenna for Wireless Applications

In this work, a novel compact wideband reconfigurable circularly polarised (CP) dielectric resonator antenna (DRA) is presented. The L-shaped Dielectric resonator antenna is excited by an inverted question mark shaped feed. This arrangement of feed-line helps to generate two orthogonal modes inside the DR, which makes the design circularly polarised. A thin micro-strip line placed on the defected ground plane not only helps to generate a wideband response but also assist in the positioning of the two diode switches. These switches located at the left and right of the micro-strip line helps in performing two switching operations. The novel compact design offers the reconfigurability between 2.9–3.8 GHz which can be used for different important wireless applications. For the switching operation I, the achieved impedance bandwidth is 24% while axial ratio bandwidth (ARBW) is 42%. For this switching state, the design has 100% CP performance. Similarly, the switching operation II achieves 60% impedance bandwidth and 58.88% ARBW with 76.36% CP performance. The proposed design has a maximum measured gain of 3.4 dBi and 93% radiation efficiency. The proposed design is novel in terms of compactness and performance parameters. The prototype is fabricated for the performance analysis which shows that the simulated and measured results are in close agreement.