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Energy-Aware Loop Parallelism Maximization for Multi-core DSP Architectures

Energy-Aware Loop Parallelism Maximization for Multi-core DS...

IEEE/ACM Int'l Conference on & Int'l Conference on Cyber, Physical and Social Computing (CPSCom) Green Computing and Communications (GreenCom)

作者： Meikang Qiu Jian-Wei Niu Laurence T. Yang Xiao Qin Senlin Zhang Bin Wang Department of Electrical and Computer Engineering University of Kentucky KY USA State Key Laboratory of Software Development Environment Beihang University Beijing China Department of Computer Science Saint Francis Xavier University NS Canada Department of Computer Science and Software Engineering Aubum University Auburn AL USA Department of Systems Science and Engineering University of Zhejiang Hangzhou China Department of Computer Science and Engineering Wright State University Dayton OH USA

With the advance of semiconductor, multi-core architecture is inevitable in today's embedded system design. Nested loops are usually the most critical part in multimedia and high performance DSP (Digital Signal Processing) systems. Hence, maximizing loop parallelism is an important issue to improve the performance of a modern compiler. This paper studies how to maximize the system performance with the consideration of energy reduction for applications with multidimensional nested loops on multi-core DSP architectures. An algorithm, EALPM (Energy-Aware Loop Parallelism Maximization), is proposed in this paper. We implemented a two phase strategy. First, the strategy uses retiming and loop transformation to parallelize nested loops. Then the strategy employs a novel voltage assignment algorithm to reduce total energy consumption. The experimental results show that on average, both performance and energy-saving can be significantly improved using the EALPM algorithm.

关键词： Parallel processing Energy consumption Voltage control Optimization Algorithm design and analysis computer architecture Digital signal processing

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The 2010 2nd International Conference on Future computer and Communication(第二届未来计算机与通信国际会议 ICFCC 2010)

作者： Xiaoqiang Zhang Shilong Ma Weiping Wang Mengmeng Wang Guiliang Zhu State Key Lab of Software Development Environment Beijing University of Aeronautics and Astronautics Department of Information Engineering North China University of Water Conservancy and Electric Power

ISBN: (纸本)9781424458219;9781424458240

Secure transmission of confidential digital images has become a common interest in both research and applications. As shown in our previous studies, Mixed Image Element (MIE) encryption algorithm is a new and promising image encryption algorithm, however, its security is affected by the unreasonable choice of camouflaged images. To analyze this factor, the definitions of image integral similarity, image partial similarity and MIE classification attack, as well as their mathematic models are proposed in this paper. We analyze the influence of image integral similarity on the security of MIE encryption algorithm in detail with an example. The experimental results demonstrate that the algorithm performs best when the image integral similarity is 0.5, it gets worst when the image integral similarity approaches 0 or 1. This conclusion provides an important theoretical foundation for the practical application of MIE encryption algorithm. The influence of image partial similarity is also analyzed in detail with an example. The experiment shows how to find a true image element for a specific image with the image partial similarity. Finally, two remedial measures are given to defend the MIE classification attack, which is meaningful for completing MIE encryption algorithm.

关键词： image similarity mixed image element image encryption image retrieval attack method

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Algorithmic trading system: design and applications

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中国高等学校学术文摘·计算机科学 2009年第2期3卷 235-246页

作者： Feng WANG Keren DONG Xiaotie DENG State Key Lab of Software Engineering Wuhan UniversityWuhan 430072China Department of Computer Science City University of Hong KongKowloonHong KongChina

This paper provides an overview of research and development in algorithmic trading and discusses key issues involved in the current effort on its improvement, which would be of great value to traders and investors. Some current systems for algorithmic trading are introduced, to-gether with some illustrations of their functionalities. We then present our platform named FiSim and discuss its over-all design as well as some experimental results in user strat-egy comparisons.

关键词： algorithmic trading portfolio optimization news retrieval decision making system design

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Performance Analysis of Sub-Rating for Handoff Calls in HCN

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International Journal of Communications, Network and System sciences 2009年第1期2卷 21-29页

作者： Xiaolong WU Min HE Fei WANG Jun ZHENG Emma REGENTOVA Guoshun HAO California State University Long Beach CA USA Department of Computer Science New Mexico Institute of Mining and Technology New Mexico USA Department of EE California State University Long Beach CA USA Department of Electrical and Computer Engineering University of Nevada Las Vegas Nevada USA National Lab of Software Development Environment Beijing University of Aeronautics and Astronautics Beijing China

Hierarchical Cellular Networks (HCN) offer more efficient channel utilization and better quality of service (QoS) under the high tele-traffic condition compared to the single-tier system. One of the important measures of QoS in HCN as in any single-tier system is the handoff dropping rate. Although the existing approaches such as guard channel and queuing can reduce forced termination probability, they also result in higher new call blocking probability. The channel sub-rating strategy has found to be an effective technique to reduce the handoff force termination probability while preserving the new call blocking probability in a single-tier system. In this paper, we propose a new call admission control scheme for HCN based on the channel sub-rating. Analytic models based on 1-D Markov process in microcell and 2-D Markov process in macrocell are developed. Experimental results show that our scheme achieves lower blocking and forced termination probabilities compared to the traditional guard channel scheme. The effect of channel sub-rating on the voice quality degradation is also studied. Results demonstrate that we can establish a good balance between the forced termination probability and the voice quality degradation by varying the number of sub-ratable full-rate channels.

关键词： Sub-Rating HCN Handoff Degradation Ratio

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Towards multi-dimensional separating of NFRs in software architecture

Towards multi-dimensional separating of NFRs in software arc...

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International Conference on computer science and software engineering, CSSE 2008

作者： Zhang, Lin-Lin Ying, Shi Ni, You-Cong Wen, Jing Zhao, Kai Ye, Peng The State Key Lab of Software Engineering Wuhan University Wuhan China School of Information Science and Engineering Xinjiang University Urumqi China Department of Mathematics and Physics Anhui Institute of Architecture and Industry Hefei China College of Computer Science Wuhan University of Science and Engineering Wuhan China

ISBN: (纸本)9780769533360

software architecture design is an important stage in the whole software development lifecycle. Yet non-functional requirements (NFRs) have been afflicted architects for a long time and how to efficiently design and address them also becomes a big headache problem. This paper focuses on the NFRs in architecture and offers a preliminary insight on separating them in a multiple dimensional way. Consequently, it proposes a model named "1+X" for handling NFRs in architecture, including classifying those into 12 dimensions, and then specifying and mapping those into aspects. By this model, architects can easily analyze and handle NFRs during the architecture design for a specific system. © 2008 IEEE.

关键词： software architecture

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A generic model for multi-dimensional separation of concerns at architecture level

A generic model for multi-dimensional separation of concerns...

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2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008

作者： Zhang, Lin-Lin Ying, Shi Ni, You-Cong Wen, Jing Zhao, Kai Ye, Peng State Key Lab. of Software Engineering Wuhan University Wuhan China School of Information Science and Engineering Xinjiang University Urumqi China Department of Mathematics and Physics Anhui Institute of Architecture and Industry Hefei China College of Computer Science Wuhan University of Science and Engineering Wuhan China

ISBN: (纸本)9781424421084

software architecture design is an important stage in the whole software development lifecycle. There are so many various concerns at architecture level which relate to all kinds of stakeholders and describe the all facets of problem domain. Unfortunately, they often tangle and scatter in the components and connectors, result in the final architecture solutions uneasy to evolve and reuse. So in this paper, we propose a generic model named "1+X" which can separate the concern at architecture level along multiple dimensions. Also, we provide specification for each dimension and concerns in a dimension. This makes it possible to effectively cope with the crosscutting concerns at architecture level, encapsulate those using aspects or design decisions in the later architecture design activities. © 2008 IEEE.

关键词： software design

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Designing Security Protocols Using Novel Neural Network Model

Designing Security Protocols Using Novel Neural Network Mode...

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International Conference on Natural Computation (ICNC)

作者： Tieming Chen Rongrong Jiang College of Software Engineering Zhejiang University of Technology Hangzhou China State Key Laboratory of Software Development Environment Beihang University Beijing China Department of Computer Science and Technology Zhejiang Radio and Television University Hangzhou China

Two neural networks with the common input vector can finally synchronize their weight vectors by output- based mutual learning. It can be well utilized to negotiate secure information over a public channel. Designing security protocols based on such synchronized neural network model is quite advantageous for its low-cost and high-performance. In this paper, we at first analyze and optimize the interacting network neurl, then present a cryptography-oriented secure parity model and implement the performance simulations. As an instance, a novel key agreement protocol design scenario is finally proposed.

关键词： Neural networks Cryptography Cryptographic protocols Information security Analytical models Computational modeling computer security Programming Educational institutions software engineering

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Study on data collaboration service for collaborative virtual geographic environment

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16th International Conference on Artificial Reality and Telexistence, ICAT 2006

作者： Zhu, Jun Gong, Jianhua Qi, Hua Song, Tao State Key Laboratory of Remote Sensing Science Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing 100101 China Key Laboratory of Poyang Lake Ecological Environment and Resource Development Ministry of Education China Surveying Engineering Department Southwest Jiaotong University China GIS Lab Department of Geoinformatic Engineering Inha University Yonghyundong 253 Namgu Inchon 402-751 Korea Republic of

ISBN: (纸本)3540497765

The use of Collaborative Virtual Geographic environments (CVGE) is one of the most promising uses of virtual reality in geographic field. Data collaboration can support multi-directional sharing of data and files, allowing ideas and thoughts to be communicated interactively among users. Thus how to integrate diverse and separated data and offer more convenient and intuitive data collaboration service becomes increasingly significant for implementing collaborative work in the CVGE. In this paper, we firstly design a Grid-based CVGE service framework and discuss the data searching mechanism and accessing control. A data collaboration service was built to integrate and share system internal resources and improve collaboration work efficiency. Finally, we built a collaborative virtual environment and implemented data collaboration service in silt dams system planning on a case study area, Jiu-Yuan-Gou watershed of Loess Plateau, China. Experiment results prove that the scheme addressed in the paper is efficient and feasible. © 2006 Springer-Verlag Berlin/Heidelberg.

关键词： Virtual reality

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On designing a novel PI controller for AQM routers supporting TCP flows

On designing a novel PI controller for AQM routers supportin...

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7th Asia-Pacific Web Conference on Web Technologies Research and development - APWeb 2005

作者： Xiong, Nai-Xue He, Yan-Xiang Yang, Yan Xiao, Bin Jia, Xiaohua State Key Lab of Software Engineering Computer School of Wuhan University Wuhan Hubei 430079 China Computer Science Department Central China Normal University Wuhan 430079 China Department of Computing Hong Kong Polytechnic University Hung Horn Kowloon Hong Kong IEEE Communication Society Department of Computer Science City University of Hong Kong Kowloon Hong Kong

Active Queue Management (AQM) is an effective method to enhance congestion control, and to achieve tradeoff between link utilization and delay. The de facto standard, Random Early Detection (RED), and most of its variants use queue length as congestion indicator to trigger packet dropping. As an extension of RED, a novel AQM algorithm, called NPI-RED, is proposed in this paper. The NPI-RED is based on a novel proportional and integral controller, which not only considers the average queue length at the current time slot, but also takes into consideration the past average queue lengths within a round trip time. We provide a guideline for the selection of the feedback gains for TCP/RED system to stabilize the dynamics, make the queue length converge at a certain target and improve the network performance. We present the condition of asymptotic stability for the model in terms of the average queue length, by using a method, in which we construct a Routh table associated with the characteristic polynomial. Based on the stability condition and control gains selection method, the extensive simulation results by ns2 demonstrate that the NPI-RED algorithm outperforms than the existed AQM schemes in robustness, drop probability and stability. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Control equipment

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A field-based collaboration strategy in MADCE

A field-based collaboration strategy in MADCE

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作者： He, Yanxiang Du, Zhuomin Li, Xuhui Cooley, Donald H. He, Jing College of Computer State Key Lab of Software Engineering Wuhan University Wuhan 430072 China Department of Computer Science Utah State University Logan UT 84322-4205 United States

In this paper, we propose a field-based collaboration algorithm that can be applied to searching the local-best co-agent within field. The dynamic "field" structure of the collaborating objects limits the range of information communicating and sharing, and adjusts the load of Agents dynamically. An efficient method for Agent's collaboration in MADCE is presented, which can balance the system load, reduce the executive cost, and broaden the ability of Distributed Computing environment.

关键词： Distributed computer systems

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