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International Conference on Information Science and Digital Content technology

作者： Peng Li Lejian Liao Beijing Engineering Research Centre of High Volume Language Information Processing & Cloud Computing Applications Multi-living-agent Information System Key Laboratory and Beijing Laboratory of Intelligent Information Technology School of Computer Scienc

ISBN: (纸本)9781467312882

This paper presents a novel WQA (Web Question Answering) approach based on the combination CCG (Combinatory Categorial Grammar) and DL (Description Logic) ontology, in order to promote semantic-level accuracy through deep text understanding capabilities. We propose to take DL based semantic modeling, i.e., translating lambda-expression encoding of question meaning into DL based semantic representations. The advantage of such approach is a seamless exploitation of existing semantic resource coded as DL ontology, which is widespread in such area as the Semantic Web and conceptual modeling. The experiments are conducted with a repository of complex Chinese questions which involves the satisfaction of some object property restrictions. The experimental results show that producing the semantic representations with the combination of CCG parsing and DL reasoning is an effective approach for question understanding at semantic level, in terms of both understanding accuracy promotion and semantic resource exploitation.

关键词： Semantics Ontologies Syntactics Grammar Cognition Accuracy Semantic Web

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Battery discharge characteristics of wireless sensors in building applications

Battery discharge characteristics of wireless sensors in bui...

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IEEE International Conference on Networking, Sensing and Control

作者： Wenqi Guo William M. Healy Meng Chu Zhou Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA National Institute for Standards and Technology Gaithersburg MD USA Key Laboratory of Embedded System and Service Computing Ministry of Education University of Tongji Shanghai China ECE Department New Jersey Institute of Technology Newark NJ USA

Sensor nodes in wireless networks often use batteries as their source of energy, but replacing or recharging exhausted batteries in a deployed network can be difficult and costly. Therefore, prolonging battery life becomes a principal objective in the design of wireless sensor networks (WSNs). There is little published data that quantitatively analyze a sensor node's lifetime under different operating conditions. This paper presents several experiments to quantify the impact of key wireless sensor network design and environmental parameters on battery performance. Our testbed consists of MicaZ motes, commercial alkaline batteries, and a suite of techniques for measuring battery performance. We evaluate known parameters, such as communication distance, working channel and operating power that play key roles in battery performance. Through extensive real battery discharge measurements, we expect our results to serve as a quantitative basis for future research in designing and implementing battery-efficient sensing applications and protocols.

关键词： Batteries Wireless sensor networks Discharges (electric) Sensor phenomena and characterization Battery charge measurement Voltage measurement

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Image segmentation algorithm combining mean shift with minimum spanning tree

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2012年第3期23卷 588-594页

作者： Wang, Qian Zhang, Hua Xu, Guang-Ping Xue, Yan-Bing Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Key Laboratory of Computer Vision and System Tianjin University of Technology Tianjin 300384 China

This paper presents an image segmentation algorithm combining mean-shift with the minimum spanning tree, in order to improve the operating efficiency of the classic mean shift. The algorithm first selects a smaller spatial bandwidth, and applies the mean shift to over-segment image at a faster speed. Then, we regard the over-segmentation region as the basic unit of subsequent procedure to construct a weighted region adjacency graph, and then use the minimum spanning tree algorithm to merge over-segmentation image. The experimental results verify that this algorithm, on the premise of ensuring the quality of image segmentation, substantially increases the speed of the classic mean shift segmentation algorithm.

关键词： Image segmentation

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Asymptotic throughput for large-scale wireless networks with general node density

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Wireless Networks 2012年第5期19卷 559-575页

作者： Cheng Wang Changjun Jiang Xiang-Yang Li Yunhao Liu Department of Computer Science Tongji University Shanghai China Key Laboratory of Embedded System and Service Computing Ministry of Education Shanghai China The Tsinghua National Laboratory for Information Science and Technology (TNLIST) Department of Computer Science and Engineering Tongji University Shanghai China The Department of Computer Science Illinois Institute of Technology Chicago USA The TNLIST and School of Software Tsinghua University Beijing China CSE The Hong Kong University of Science and Technology Kowloon Hong Kong

We study the asymptotic throughput for a large-scale wireless ad hoc network consisting of n nodes under the generalized physical model. We directly compute the throughput of multicast sessions to unify the unicast and broadcast throughputs. We design two multicast schemes based on the so-called ordinary arterial road system and parallel arterial road system, respectively. Correspondingly, we derive the achievable multicast throughput by taking account of all possible cases of n s = ω(1) and 1 ≤ n d ≤ n − 1, rather than only the cases of $$n_s=\Uptheta(n)$$ as in most related works, where n s and n d denote the number of sessions and the number of destinations of each session, respectively. Furthermore, we consider the network with a general node density $$\lambda \in [1,n]$$ , while the models in most related works are either random dense network (RDN) or random extended network (REN) where the density is λ = n and λ = 1, respectively, which further enhances the generality of this work. Particularly, for the special case of our results by letting λ = 1 and $$n_s=\Uptheta(n)$$ , we show that for some regimes of n d , the multicast throughputs achieved by our schemes are better than those derived by the well-known percolation-based schemes.

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New Methodologies for Parallel Architecture

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Journal of Computer Science & technology 2011年第4期26卷 578-587页

作者：范东睿李晓维李国杰 Key Laboratory of Computer System and Architecture Institute of Computing TechnologyChinese Academy of Sciences

Moore＇s law continues to grant computer architects ever more transistors in the foreseeable future, and parallelism is the key to continued performance scaling in modern microprocessors. In this paper, the achievements in our research project, which is supported by the National Basic Research 973 Program of China, on parallel architecture, are systematically presented. The innovative approaches and techniques to solve the significant problems in parallel architecture design are smnmarized, including architecture level optimization, compiler and language-supported technologies, reliability, power-performance efficient design, test and verification challenges, and platform building. Two prototype chips, a multi-heavy-core Godson-3 and a many-light-core Godson-T, are described to demonstrate the highly scalable and reconfigurable parallel architecture designs. We also present some of our achievements appearing in ISCA, MICRO, ISSCC, HPCA, PLDI, PACT, IJCAI, Hot Chips, DATE, IEEE Trans. VLSI, IEEE Micro, IEEE Trans. Computers, etc.

关键词： architecture multi-core many-core parallelism

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Green challenges to system software in data centers

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中国计算机科学前沿 2011年第3期5卷 353-368页

作者： Yuzhong SUN Yiqiang ZHAO Ying SONG Yajun YANG Haifeng FANG Hongyong ZANG Yaqiong LI Yunwei GAO Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100190 China

With the increasing demand and the wide application of high performance commodity multi-core processors,both the quantity and scale of data centers grow dramatically and they bring heavy energy *** and engineers have applied much effort to reducing hardware energy consumption,but software is the true consumer of power and another key in making better use of *** software is critical to better energy utilization,because it is not only the manager of hardware but also the bridge and platform between applications and *** this paper,we summarize some trends that can affect the efficiency of data ***,we investigate the causes of software *** on these studies,major technical challenges and corresponding possible solutions to attain green system software in programmability,scalability,efficiency and software architecture are ***,some of our research progress on trusted energy efficient system software is briefly introduced.

关键词： green software multi-core data center power efficient system software

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Genetic Fuzzy + PI Path Tracking Control of a Nonholonomic Mobile Robot

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电子学报(英文版) 2011年第1期20卷 31-34页

作者： CAO Zhengcai ZHAO Yingtao WU Qidi College of Information Science and Technology Beijing University of Chemical Technology Beijing China The Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai China

A mobile robot is one of the well-known nonholonomic systems. The genetic fuzzy + PI path track- ing control applied to a mobile robot is presented. The pro- posed controller composes of two fuzzy + PI controllers which are employed to control the angular velocity to- gether, and one fuzzy + PI controller that is utilized to adjust the speed of mobile robot solely. Moreover, the fuzzy controller is designed to track reference path in ap- proaching phase and PI controller is operated to diminish the tracking error in stable phase. In order to obtain bet- ter tracking performance, Genetic algorithm (GA) is used to optimize controller parameters. Finally, computer sim- ulation results are given to illustrate the effectiveness of the proposed control scheme.

关键词：模糊PI控制器移动机器人机器人控制非完整系统路径跟踪遗传算法模糊控制器控制器参数

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A partially reconfigurable architecture supporting hardware threads

A partially reconfigurable architecture supporting hardware ...

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IEEE International Conference on Field-Programmable technology (FPT)

作者： Ying Wang Jian Yan Xuegong Zhou Lingli Wang Wayne Luk Chenglian Peng Jiarong Tong State Key Laboratory of ASIC and System Fudan University Shanghai China Department of Computing Imperial College London London United Kingdom School of Computer Science and Technology Fudan University Shanghai China

As a promising computing platform for stream processing, partially reconfigurable systems have shown their hardware efficiency and reconfiguration flexibility. This paper presents a partially reconfigurable architecture supporting hardware threads. It gives a unified software/hardware thread interface and high throughput point-to-point streaming structure. Dynamic computing resource allocation and streaming-based multi-threaded management are also provided at operating system level. It is easy for programmers to exploit the inherent thread, data and pipeline parallelism in a unified view of threads, enhancing hardware efficiency while improving productivity. The experimental results on a cryptography application demonstrate the feasibility and superior performance. Moreover, the parallelized AES, DES and 3DES hardware threads on field-programmable gate arrays show 1.61-4.59 times higher power efficiency than their implementations on state-of-the-art graphics processing units.

关键词： Hardware Instruction sets Computer architecture Runtime Kernel

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Damping based multi-path traffic allocation algorithm for wireless networks

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Journal of Computational Information systems 2012年第10期8卷 4169-4175页

作者： Lu, Xu Yu, Ruiguo Dong, Wenyong Lei, Ming Hao, Lianxiu School of Computer Science and Technology Tianjin University Tianjin 300072 China Computer School Wuhan University Wuhan 430079 China Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin University of Technology Tianjin 300191 China Key Laboratory of Computer Vision and System Ministry of Education Tianjin 300191 China School of Electronic Information Engineering Tianjin University Tianjin 300072 China

In physics, damping is any effect that tends to reduce the amplitude of oscillations in an oscillatory system. Inspired by this, we present a new traffic allocation algorithm for Wireless Networks in order to limit the packet delay variance. We refer to our algorithm as the damping based traffic allocation algorithm (DBTA). DBTA computes the queuing delay and queuing delay variance, configures system parameters, and finally reduces the amplitude of delay variations. We realize DBTA based on Dynamic Source Routing (DSR) protocol. Performance comparison of DBTA with DSR using Network Simulator (NS-2) simulation shows that DBTA can achieve a remarkable improvement in decreasing the packet delay variance. © 2011 by Binary Information Press.

关键词： Damping

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An architecture description language based on dynamic description logics 1

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7th IFIP International Conference on Intelligent Information Processing, IIP 2012

作者： Wang, Zhuxiao Peng, Hui Guo, Jing Zhang, Ying Wu, Kehe Xu, Huan Wang, Xiaofeng School of Control and Computer Engineering State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China Education Technology Center Beijing International Studies University Beijing 100024 China National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

ISBN: (数字)9783642328916

ISBN: (纸本)9783642328909

ADML is an architectural description language based on Dynamic Description Logic for defining and simulating the behavior of system architecture. ADML is being developed as a new formal language and/or conceptual model for representing the architectures of concurrent and distributed systems, both hardware and software. ADML embraces dynamic change as a fundamental consideration, supports a broad class of adaptive changes at the architectural level, and offers a uniform way to represent and reason about both static and dynamic aspects of systems. Because the ADML is based on the Dynamic Description Logic DDL( (D)), which can represent both dynamic semantics and static semantics under a unified logical framework, architectural ontology entailment for the ADML languages can be reduced to knowledge base satisfiability in DDL( (D)), and dynamic description logic algorithms and implementations can be used to provide reasoning services for ADML. In this article, we present the syntax of ADML, explain its underlying semantics using the Dynamic Description Logic DDL( (D)), and describe the core architecture description features of ADML. © 2012 IFIP International Federation for Information Processing.

关键词： Formal languages

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