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International Journal of Digital Content Technology and its Applications 2011年第3期5卷 219-224页

作者： Guo-Xiang, Tong Jing-zhao, Wang Yi, Li School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China Shanghai Key Laboratory of Modern Optical System Shanghai 200093 China

With the development of digital audio technology, recently, a so-called DSD(direct stream digital) coding technique becomes a hot subject of research. Now, engineers all over the world are researching on digital power amplifier and digital speaker, hoping that 1-bit stream in the form of DSD can be amplified by a digital power amplifier and then the amplified signal can be passed to a digital speaker directly so that the high-fidelity of digital audio can be achieved. In the procedure of development, the demand of high-speed is placed on the process of filtering and noise-shaping. In order to fulfill this demand, a high-speed data processing channel based on DSD is presented in this paper, the speed of data processing is enhanced effectively by using RNS FIR filter in DSP.

关键词： FIR filters

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Linear precoding for time-varying MIMO channels with low-complexity receivers

Linear precoding for time-varying MIMO channels with low-com...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Jun Tong Peter J. Schreier Steven R. Weller Louis L. Scharf School of Electrical Engineering & Computer Science University of Newcastle Australia Signal and System Theory Group Universität Paderborn Germany Department of Electrical & Computer Engineering Colorado State University USA

This paper considers linear precoding for time-varying multiple input multiple-output (MIMO) channels. We show that linear minimum mean-squared error (LMMSE) equalization based on the conjugate gradient (CG) method can result in significantly reduced complexity compared with conventional approaches. This reduction is achieved by incorporating a condition number constraint into the precoder optimization framework, which leads to clustered eigen values of the measurement covariance matrix. The cost is a small increase in MSE compared to the optimal precoder.

关键词： Complexity theory Receivers MIMO Eigenvalues and eigenfunctions Optimization Equalizers Convergence

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Prediction of hydrophobic regions effectively in transmembrane proteins using digital filter

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Journal of Biomedical science and engineering 2011年第8期4卷 562-568页

作者： Jayakishan Meher Mukesh Kumar Raval Gananath Dash Pramod Kumar Meher Department of Computer Science and Engineering Vikash College of Engineering for Women Department of Chemistry G. M. College School of Physics Sambalpur University Jyoti Vihar Department of Embedded System Institute for Infocomm Research

The hydrophobic effect is the major factor that drives a protein molecule towards folding and to a great degree the stability of protein structures. Therefore the knowledge of hydrophobic regions and its prediction is of great help in understanding the structure and function of the protein. Hence determination of membrane buried region is a computationally intensive task in bioinformatics. Several prediction methods have been reported but there are some deficiencies in prediction accuracy and adaptability of these methods. Of these proteins that are found embedded in cellular membranes, called as membrane proteins, are of particular importance because they form targets for over 60% of drugs on the market. 20-30% of all the proteins in any organism are membrane proteins. Thus transmembrane protein plays important role in the life activity of the cells. Hence prediction of membrane buried segments in transmembrane proteins is of particular importance. In this paper we have proposed signal processing algorithms based on digital filter for prediction of hydrophobic regions in the transmembrane proteins and found improved prediction efficiency than the existing methods. Hydrophobic regions are extracted by assigning physico-chemical parameter such as hydrophobicity and hydration energy index to each amino acid residue and the resulting numerical representation of the protein is subjected to digital low pass filter. The proposed method is validated on transmembrane proteins using Orientation of Proteins in Membranes (OPM) dataset with various prediction measures and found better prediction accuracy than the existing methods.

关键词： Hydrophobic Region Transmembrane Protein Wavelet Transform Physico-Chemical Parameter Digital Filter

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Energy optimal selection of access points in wireless sensor networks

Energy optimal selection of access points in wireless sensor...

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2011 5th International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing, IMIS 2011

作者： Xin, Qin Yao, Xiaolan He, Wei Universite Catholique de Louvain Department of Applied Mathematics Louvain-la-Neuve Belgium National University of Defense Technology School of Computer Science Changsha China State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Electrical Engineering Chongqing University China

ISBN: (纸本)9780769543727

In a Wireless Sensor Networks (WSN), there are normally one or several sensor nodes working as Access Points (AP), which are able to provide a relay for other sensors to an external Internet connection. Since WSNs are resource-constrained, the selection of APs is very crucial in economizing power usage. In this paper, we study the optimal selection of APs to maximize the WSN lifetime. This issue is closely related to routing protocols in WSN. We propose a new adaptive multi-path routing protocol to reduce the energy consumption and guarantee QoS requirements with respect to transmission delay. In this paper, we formulate the issues we mentioned above as a non-linear NP-hard optimization problem. Due to the high computation complexity of this problem, we proposed two polynomial-time approximation algorithms to optimally select APs in the WSN that based on the framework in [41]. Combining with our new adaptive multi-path routing protocol, our preliminary simulation results show that our schemes can save more than 20% energy compared with the existing APs selection schemes with single-path routing protocols. © 2011 IEEE.

关键词： Routing protocols

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A fine-grained technique of NBTI-aware voltage scaling and body biasing for standard cell based designs 11

A fine-grained technique of NBTI-aware voltage scaling and b...

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Asia and South Pacific Design Automation Conference

作者： Yongho Lee Taewhan Kim System LSI Samsung Electronics Company Limited South Korea School of Electrical Engineering and Computer Science Seoul National University South Korea

ISBN: (纸本)9781424475162

As the technology scales, the increase of circuit delay over time due to NBTI (negative bias temperature instability) effect is not negligible any more. It has been known that voltage scaling is an effective scheme that is able to mitigate the NBTI effect. However, a careful control of voltage scaling is required not to increase the dissipation of dynamic power significantly. On the other hand, body biasing can also be used to mitigate the NBTI effect by lowering down the threshold voltage, but its effectiveness is limited, as will be demonstrated in this work, and it increases the leakage power. This work addresses an important problem of minimizing the power consumption of circuit while controlling the NBTI induced delay increase to meet the circuit timing constraint by simultaneously utilizing the effects of voltage scaling and body biasing on both NBTI and power consumption. Precisely, we solve the problem of finding a set of supply and body biasing voltage values to apply circuit clusters on standard cell based design to minimize the total power consumption while satisfying the constraint of circuit life time, considering the NBTI induced delay factor in circuit timing computation. By a comprehensive analysis on the relations between the values of supply and body biasing voltages and the values of the resulting power consumption and NBTI induced delay, we precisely formulate the problem, and transform it into a problem of convex optimization to solve it efficiently. Through extensive experimentation using ISCAS benchmark designs, it is shown that the proposed approach to the simultaneous exploitation of supply voltage and body biasing is able to produce designs with 14% and 8% reduced energy consumption on average over the designs produced by the design time NBTI-aware guard-banding based voltage scaling and the run time NBTI-aware voltage scaling, respectively.

关键词： Delay Threshold voltage Logic gates Convex functions Voltage control Energy consumption

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Control of epidemic spreading on complex networks by local traffic dynamics

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Physical Review E 2011年第4期84卷 045101(R)-045101(R)页

作者： Han-Xin Yang Wen-Xu Wang Ying-Cheng Lai Yan-Bo Xie Bing-Hong Wang Department of Physics Fuzhou University Fuzhou 350002 China Department of Modern Physics University of Science and Technology of China Hefei 230026 China School of Electrical Computer and Energy Engineering Arizona State University Tempe Arizona 85287 USA Research Center for Complex System Science University of Shanghai for Science and Technology and Shanghai Academy of System Science Shanghai 200093 China

Despite extensive work on traffic dynamics and epidemic spreading on complex networks, the interplay between these two types of dynamical processes has not received adequate attention. We study the effect of local-routing-based traffic dynamics on epidemic spreading. For the case of unbounded node-delivery capacity, where the traffic is free of congestion, we obtain analytic and numerical results indicating that the epidemic threshold can be maximized by an optimal routing protocol. This means that epidemic spreading can be effectively controlled by local traffic dynamics. For the case of bounded delivery capacity, numerical results and qualitative arguments suggest that traffic congestion can suppress epidemic spreading. Our results provide quantitative insight into the nontrivial role of traffic dynamics associated with a local-routing scheme in the epidemic spreading.

关键词： TRAFFIC congestion computer networks PROBABILITY theory computer viruses EMAIL

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Evaluation of a new Backtrack Free path planning Algorithm for two manipulators

Evaluation of a new Backtrack Free path planning Algorithm f...

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International Conference on Research and Innovation in Information systems (ICRIIS)

作者： Md. Nazrul Islam J. Gallardo-Alvarado Shinsuke Tamura Faculty of Computer Science and Information System University Technology of Malaysia Skudai Johor Malaysia Graduate School of Engineering University of Fukui Fukui Japan

This paper describes a path planning algorithm for calculates collision free path of two manipulators in a populated environment for 2 or 3-dimensional workspace. In the algorithm, two manipulators are considered as a single composite one. A newly developed path planning algorithm BFA (Backtrack Free path planning Algorithm) enables the efficient generation of paths of this composite manipulator with many arms. BFA is an exact algorithm, i.e. the algorithm is backtrack free and resolution complete. Its computation time and memory space are proportional to the total number of arms in composite manipulators. Therefore paths can be calculated within practical and predetermined time even for manipulators with many arms, and it becomes possible to plan complicated motions of multi-arm manipulators in fully automated environments. The performance of BFA is evaluated for 2-dimensional environments. An additional advantage of this approach is that paths of individual manipulators can be calculated in parallel processing.

关键词： Manipulators Path planning Algorithm design and analysis Joints Real time systems Position measurement

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Delay modeling and estimation of a wireless based network control system

Delay modeling and estimation of a wireless based network co...

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Asian Control Conference

作者： Jianjun Bai Minyue Fu Hongye Su Institute of Cyber-System and Control University of Zhejiang Hangzhou China School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW Australia

In this paper, a wireless based network control system is considered. Poisson process models are proposed to approximate the transmission delays for both single-hop and multi-hop wireless transmissions. State estimation is done in the real wireless network and a simulated network using the Poisson process model. The estimate errors in the two cases match well, which verifies the validity of the delay model.

关键词： Delay computers Kalman filters Mathematical model Wireless networks Spread spectrum communication

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Candidate ions for active optical clock and narrow-linewidth Ion laser

Candidate ions for active optical clock and narrow-linewidth...

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全国光电子与量子电子学技术大会

作者：庄伟陈景标 Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System & Network School of Electronics Engineering & Computer Science Peking University

Since the proposal of active optical clock[1,2], a number of neutral atoms with two-level, three-level, and four-level at thermal, laser cooled and trapped configurations have been investigated recently[1-11]. The potential quantum limited linewidth of the active optical clock is narrower than mHz, and to reach this unprecedented linewidth is possible since the thermal noise of cavity mode can

关键词： Candidate ions for active optical clock and narrow-linewidth Ion laser

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Impact Dynamics of a Flying Soccer Ball with Consideration of Variable Characteristic of Coefficient of Restitution

Impact Dynamics of a Flying Soccer Ball with Consideration o...

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2011 IEEE International Conference on Robotics and Automation(2011年IEEE世界机器人与自动化大会 ICRA 2011)

作者： Jae Yeon Choi Byung-Ju Yi Younghun Kwon School of Electrical Engineering and Computer Science Hanyang UniversityKorea Department of Electronic System Engineering Hanyang UniversityKorea Department of Applied Physics Hanyang UniversityKorea

This paper deals with the impact dynamics of a soccer ball. The trajectory of the ball is decided according to its initial velocity, launch angle, and some aerodynamic effect. Specially, the initial velocity is created by an instant impulse given to the ball. The external impulse exerted on a ball by a kicking robot is a function of the robot’s geometry and dynamic parameters. Here, the coefficient of restitution (COR) is an important parameter to calculate the impulse applied to the ball when the collision is occurred. Usually, COR has been assumed a constant value. We derive an analytical model of COR for the pendulum model colliding with a soccer ball, and show that COR varies according to the velocity. The drag force is taken into account in the COR model. The velocity-dependent characteristic of COR is applied to simulation of a soccer ball traveling a long distance. It is shown that the velocity-dependent COR considerably affects the traveling distance of the flying ball.

关键词： Analytical models Force Mathematical model Trajectory Drag Velocity measurement Sports equipment

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