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19th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2005

作者： Diaconescu, Roxana E. Wang, Lei Mouri, Zachary Chu, Matt California Institute of Technology Center for Advanced Computing Research University of California Irvine Department of Computer Science

ISBN: (纸本)0769523129

This paper presents the design and the implementation of a compiler and runtime infrastructure for automatic program distribution. We are building a research infrastructure that enables experimentation with various program partitioning and mapping strategies and the study of automatic distribution' s effect on resource consumption (e.g., CPU, memory, communication). Since many optimization techniques are faced with conflicting optimization targets (e.g., memory and communication), we believe that it is important to be able to study their interaction. We present a set of techniques that enable flexible resource modeling and program distribution. These are: dependence analysis, weighted graph partitioning, code and communication generation, and profiling. We have developed these ideas in the context of the Java language. We present in detail the design and implementation of each of the techniques as part of our compiler and runtime infrastructure. Then, we evaluate our design and present preliminary experimental data for each component, as well as for the entire system.

关键词： Program compilers

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Random beamforming in MIMO systems exploiting efficient multiuser diversity

Random beamforming in MIMO systems exploiting efficient mult...

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2005 IEEE 61st Vehicular Technology Conference -VTC 2005 - Spring Stockholm: Paving the Path for a Wireless Future

作者： Kim, Eun Yong Chun, Joohwan Scientific Computing Lab. Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon Korea Republic of

We propose a new random beamforming technique in forward link multiuser MIMO systems that exploits efficient multiuser diversity and spatial multiplexing gain. The common channels are allocated to more than one user simultaneously and multiple antennas at the receivers are used for interference nulling, resulting in higher throughput and reduced average waiting time. We show that the throughput of the proposed scheme outperforms the upper bound of the conventional scheme. © 2005 IEEE.

关键词： Communication channels (information theory)

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Examining design threads: Issues in Web design across student populations

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Proceedings of the Association for Information science and Technology 2006年第1期42卷

作者： Joette Stefl-Mabry Allison Druin Dania Bilal Michael Radlick Thomas Mackey Carol Doll Diane Nahl Department of Information Studies of the College of Computing and Information and School of Education University at Albany State University of New York University of Maryland College of Information Studies and Institute for Advanced Computer Studies School of Information Sciences The University of Tennessee 1345 Circle Park Knoxville TN 37996 The Not for Profit Institute for Research on Learning Technology Visions Department of Information Studies of the College of Computing and Information University at Albany State University of New York Department of Information and Computer Sciences Library and Information Science Program University of Hawai'I at Manoa

This session relates directly to this year's conference theme Sparking Synergies: Bringing Research and Practice Together as it brings together researchers from different disciplines (information science and educational technology) to discuss current issues and trends related to Web usage across student populations. “Complex design problems require more knowledge than any single person possesses” (Arias, Eden, Fischer, Gorman, and Scharff, 2000, p. 84), thus each panelist will contribute highlights of his or her current research regarding the design, information, and pedagogical, needs of specific student populations (K-12 to higher education). After the panelists have presented their findings Diane Nahl will intertwine the threads of the panelists' conversations and, with the audience's assistance, begin to weave a fabric to uncover common usability issues.

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Isothetic polygonal approximations of a 2D object on generalized grid

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1st International Conference on Pattern Recognition and Machine Intelligence, PReMI 2005

作者： Bhowmick, Partha Biswas, Arindam Bhattacharya, Bhargab B. Computer Science and Technology Department Bengal Engineering and Science University Shibpur Howrah India Advanced Computing and Microelectronics Unit Indian Statistical Institute Kolkata India

ISBN: (纸本)3540305068

Determination of an isothetic polygonal approximation of the outer or inner contour of an object is a challenging problem with numerous applications to pattern recognition and image processing. In this paper, a novel algorithm is presented for constructing the outer (or inner) tight isothetic polygon(s) containing (or filling) an arbitrarily shaped 2D object on a background grid, using a classical labeling technique, The background grid may consist of uniformly or non-uniformly spaced horizontal and vertical lines. Experimental results for both uniform and non-uniform grids of varying sizes have been reported to demonstrate the applicability and efficiency of the proposed algorithm. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Object recognition

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Mobility tolerant broadcast in mobile ad hoc networks

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6th International Workshop on Distributed computing, IWDC 2004

作者： Srimani, Pradip K Sinha, Bhabani P Department of Computer Science Clemson University ClemsonSC29634–0974 United States Advanced Computing and Microelectronics Unit Indian Statistical Institute Calcutta700108 India

ISBN: (纸本)9783540240761

A new deterministic broadcast protocol for an ad hoc network is proposed in this paper which avoids re-computation of the transmission schedule, even when the topology of the network changes due to the mobility of the nodes. The basic idea is to use a successive partitioning scheme by representing the identifier of each node (an integer) in an arbitrarily chosen radix system;the protocol then computes the specific time slots in which a particular node should transmit its message. The proposed protocol is simple, easy to implement and needs lesser broadcast time than that in [BBC99]. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Mobile ad hoc networks

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Random beamforming in MIMO systems exploiting efficient multiuser diversity

Random beamforming in MIMO systems exploiting efficient mult...

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IEEE Conference on Vehicular Technology (VTC)

作者： Eun Yong Kim Joohwan Chun Scientific Computing Laboratory Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

关键词： MIMO Array signal processing Diversity reception Base stations Receiving antennas Throughput Mobile antennas Interference Fading Transmitters

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A study of factors affecting the utility of implicit relevance feedback

A study of factors affecting the utility of implicit relevan...

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28th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2005

作者： White, Ryen W. Ruthven, Ian Jose, Joemon M. Human-Computer Interaction Laboratory Institute for Advanced Computer Studies University of Maryland College Park MD 20742 United States Department of Computer and Information Sciences University of Strathclyde Glasgow G1 1XH United Kingdom Department of Computing Science University of Glasgow Glasgow G12 8RZ United Kingdom

ISBN: (纸本)1595930345

Implicit relevance feedback (IRF) is the process by which a search system unobtrusively gathers evidence on searcher interests from their interaction with the system. IRF is a new method of gathering information on user interest and, if IRF is to be used in operational IR systems, it is important to establish when it performs well and when it performs poorly. In this paper we investigate how the use and effectiveness of IRF is affected by three factors: search task complexity, the search experience of the user and the stage in the search. Our findings suggest that all three of these factors contribute to the utility of IRF. © 2005 ACM.

关键词： Search engines

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A compiler and runtime infrastructure for automatic program distribution

A compiler and runtime infrastructure for automatic program ...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： R.E. Diaconescu Lei Wang Z. Mouri M. Chu Center for Advanced Computing Research California Institute of Technology USA Department of Computer Science University of California Irvine USA

This paper presents the design and the implementation of a compiler and runtime infrastructure for automatic program distribution. We are building a research infrastructure that enables experimentation with various program partitioning and mapping strategies and the study of automatic distribution's effect on resource consumption (e.g., CPU, memory, communication). Since many optimization techniques are faced with conflicting optimization targets (e.g., memory and communication), we believe that it is important to be able to study their interaction. We present a set of techniques that enable flexible resource modeling and program distribution. These are: dependence analysis, weighted graph partitioning, code and communication generation, and profiling. We have developed these ideas in the context of the Java language. We present in detail the design and implementation of each of the techniques as part of our compiler and runtime infrastructure. Then, we evaluate our design and present preliminary experimental data for each component, as well as for the entire system.

关键词： Program processors Runtime Application software Java Concurrent computing Distribution strategy Mobile computing Libraries Distributed computing computer science

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Outlier detection by weighted mercer-kernel based fuzzy clustering algorithm

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Iranian Journal of Electrical and computer Engineering 2005年第2期4卷 129-136页

作者： Shen, Hongbin Yang, Jie Dong, Yifei Wang, Shitong College of Computer and Information Engineering Hohai University Changzhou Jiangsu China Department of Image Processing and Pattern Recognition Jiaotong University Shanghai China School of Computer Science and Engineering University of New South Wales Australia School of Information Southern Yantze University Wuxi Jiangsu China Institute of Image Processing and Pattern Recognition Shanghai Jiaotong University China IEEE Institute of National Automation Department of Information Southern Yangtse University Polytechnic University of Hongkong Advanced Computing Research Center Bristol University United Kingdom

Outliers are data values that lie away from the general cluster of other data values. Detecting the outliers of a dataset is an important research topic for data cleaning and finding new useful knowledge in many research areas, i.e. data mining, pattern recognition, etc. In the past decades, many useful algorithms were proposed in the literature. In this paper, a new fuzzy kernel-clustering algorithm with outliers (FKCO) is presented to locate critical areas that are often represented by only a few outliers. Theoretic analysis also shows that FKCO can converge to a local minimum of the objective function. Finally, based on the information theory, a new criterion for finding outliers is also proposed. Simulations of different types of datasets demonstrate the feasibility of this new method. © 2005 JD.

关键词： Fuzzy control

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Coupling atomistic and continuum length scales in heteroepitaxial systems: Multiscale molecular-dynamics/finite-element simulations of strain relaxation in Si∕Si3N4 nanopixels

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Physical Review B 2005年第11期72卷 115338-115338页

作者： Elefterios Lidorikis Martina E. Bachlechner Rajiv K. Kalia Aiichiro Nakano Priya Vashishta Collaboratory for Advanced Computing & Simulations Department of Physics & Astronomy Department of Materials Science & Engineering and Department of Computer Science University of Southern California Los Angeles California 90089 Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 Physics Department West Virginia University Morgantown West Virginia 26506

A hybrid atomistic-continuum simulation approach has been implemented to study strain relaxation in lattice-mismatched Si∕Si3N4 nanopixels on a Si(111) substrate. We couple the molecular-dynamics (MD) and finite-element simulation approaches to provide an atomistic description near the interface and a continuum description deep into the substrate, increasing the accessible length scales and greatly reducing the computational cost. The results of the hybrid simulation are validated against full multimillion-atom MD simulations. We find that strain relaxation in Si∕Si3N4 nanopixels may occur through the formation of a network of interfacial domain boundaries reminiscent of interfacial misfit dislocations. They result from the nucleation of domains of different interfacial bonding at the free edges and corners of the nanopixel, and subsequent to their creation they propagate inwards. We follow the motion of the domain boundaries and estimate a propagation speed of about ∼2.5×103m∕s. The effects of temperature, nanopixel architecture, and film structure on strain relaxation are also investigated. We find: (i) elevated temperature increases the interfacial domain nucleation rates; (ii) a thin compliant Si layer between the film and the substrate plays a beneficial role in partially suppressing strain relaxation; and (iii) additional control over the interface morphology may be achieved by varying the film structure.

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