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检索条件"机构=Dep. Computer Architecture & Computer Technology"

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Improving communication in PGAS environments: Static and dynamic coalescing in UPC 13

Improving communication in PGAS environments: Static and dyn...

引用

27th ACM International Conference on Supercomputing, ICS 2013

作者： Alvanos, Michail Farreras, Montse Tiotto, Ettore Amaral, José Nelson Martorell, Xavier Programming Models Barcelona Supercomputer Center Barcelona Spain Department of Computer Architecture Universitat Politecnica de Catalunya Cr. Jordi Girona 1-3 08034 Barcelona Spain Static Compilation Technology IBM Toronto Laboratory Toronto ON Canada Dep. of Computing Science University of Alberta Edmonton AB Canada Barcelona Supercomputing Center Cr. Jordi Girona 29 08034 Barcelona Spain IBM Canada CAS Research Markham ON Canada

ISBN: (纸本)9781450321303

The goal of Partitioned Global Address Space (PGAS) languages is to improve programmer productivity in large scale parallel machines. However, PGAS programs may have many fine-grained shared accesses that lead to performance degradation. Manual code transformations or compiler optimizations are required to improve the performance of programs with fine-grained accesses. The downside of manual code transformations is the increased program complexity that hinders programmer productivity. On the other hand, most compiler optimizations of fine-grain accesses require knowledge of physical data mapping and the use of parallel loop constructs. This paper presents an optimization for the Unified Parallel C language that combines compile time (static) and runtime (dynamic) coalescing of shared data, without the knowledge of physical data mapping. Larger messages increase the network efficiency and static coalescing decreases the overhead of library calls. The performance evaluation uses two microbenchmarks and three benchmarks to obtain scaling and absolute performance numbers on up to 32768 cores of a Power 775 machine. Our results show that the compiler transformation results in speedups from 1.15X up to 21X compared with the baseline versions and that they achieve up to 63% the performance of the MPI versions. © 2013 ACM.

关键词： Dynamics

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Biconic semi-copulas with a given section

Biconic semi-copulas with a given section

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8th Conference of the European Society for Fuzzy Logic and technology, EUSFLAT 2013

作者： Jwaid, Tarad Baets, Bernard De Meyer, Hans De Mesiar, Radko Dept. of Mathematical Modelling Statistics and Bioinformatics Ghent University Coupure 653 B-9000 Gent Belgium Dept. of Applied Mathematics Computer Science Ghent University Krijgslaan 281 S9 B-9000 Gent Belgium Dep. of Mathematics and Descriptive Geometry Slovak University of Technology Radlinského 11 813 68 Bratislava Slovakia

ISBN: (纸本)9781629932194

Inspired by the notion of biconic semi-copulas, we introduce biconic semi-copulas with a given section. Such semi-copulas are constructed by linear interpolation on segments connecting the graph of a continuous and decreasing function to the points (0, 0) and (1, 1). Special classes of biconic semi-copulas with a given section such as biconic (quasi-)copulas with a given section are considered. Some examples are also provided © 2013. The authors-Published by Atlantis Press.

关键词： Fuzzy logic

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Swarm art with KANTS: Using an ant clustering algorithm for generating abstract paintings

Swarm art with KANTS: Using an ant clustering algorithm for ...

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1st International Conference on Complex Systems, ICCS 2012

作者： Fernandes, Carlos M. Mora, Antonio Merelo, Juan Julian Rosa, Agostinho C. Dep. of Computer Architecture and Technology University of Granada Granada Spain Technical University of Lisbon Lisbon Portugal

ISBN: (纸本)9781467347662

This paper describes an ant-based clustering algorithms and suggests its application as a swarm art conceptual tool. The algorithm, called KANTS, consists on a set of equations that model the local behavior of simple units (ants) that represent data samples. When moving on a heterogeneous 2-dimensional lattice of vectors, global behavior emerges from the local interaction between the ants, which self-organize into clusters. In this paper, KANTS is used outside a purely scientific framework. The algorithm is applied to two different types of data (sleep Electroencephalogram signals and colored photographs) for generating 2-dimensional abstract representations of those sets of data. We call the images pherogenic drawings, since they are a visual representation of the algorithm's pheromone maps. The method is contextualized within the swarm art field as well as within the authors' previous works on swarm art. © 2012 IEEE.

关键词： Clustering algorithms

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On the topology characterization of ***

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2012 IEEE 8th International Conference on Wireless and Mobile Computing, Networking and Communications, WiMob 2012

作者： Cerdà-Alabern, Llorenç Univ. Politècnica de Catalunya Computer Architecture Dep. Barcelona Spain

ISBN: (纸本)9781467314305

In this paper it is analyzed the topology of *** Wireless Community Network (WCN). WCN have emerged in recent years organized and dep.oyed by the cooperation of its own customers. WCN keep parallelisms with the construction of the Internet, and seems logical to look for common characteristics among them. More specifically, it is investigated whether there are topology patterns of ***, and to what extend they share the power-law properties that have been found to obey many topology parameters of the Internet. The paper also proposes a topology generator algorithm that it is able to reproduce specific graph properties that have been obtained for ***. © 2012 IEEE.

关键词： topology Internets Power law logical Community Networks

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A Token-based Illicit Copy Detection Method Using Complexity for a Program Exercise

A Token-based Illicit Copy Detection Method Using Complexity...

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International Conference on Broadband, Wireless Computing, Communication and Applications (BWCCA)

作者： Mai Iwamoto Shunsuke Oshima Takuo Nakashima Center for Technical and Educational Support Kumamoto National College of Technology Yatsushiro Kumamoto Japan ICT Center for Learning Support Kumamoto National College of Technology Yatsushiro Kumamoto Japan Dep. of Electronics Engineering and Computer Science Tokai University Kumamoto Japan

The conducts to copy using other person's source codes and submit as reports are regarded as a problem for program exercises of programming subjects in universities or colleges. An automatic detection algorithm to detect illicit copies is required in these educational organizations. In previous researches, these methods based on the detection standard of the token length have been proposed. These methods use the threshold simply using the character length. In these cases, miss detections occur in the case of the simple program such as the sequence of the print statement or the case that token sequences appear in the middle of a statement. This paper proposes the detection method using the program complexity and the complete token sequence. As the results of experiments, our method can improve the recall R adopting the complexity as the detection standard and the precision P adopting the complete token sequence for exercise programs submitted by students.

关键词： Cloning Complexity theory Educational institutions Syntactics Feature extraction Measurement Electronic mail

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Named entity recognition on real data: A preliminary investigation for Turkish

Named entity recognition on real data: A preliminary investi...

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International Conference on Application of Information and Communication Technologies (AICT)

作者： Gökhan Çelikkaya Dilara Torunoğlu Gülsen Eryiğit R&D Department Huawei Technologies Co. Ltd Istanbul 34768 Turkey Istanbul Technical University Institute of Science and Technology Istanbul Turkey Dep. of Computer Engineering Istanbul Technical University Istanbul Turkey

Named Entity Recognition (NER) is a well-studied area in natural language processing (NLP) and the reported results in the literature are generally very high (~>%95) for most of the languages. Today, the focus area of most practical natural language applications (i.e. web mining, sentiment analysis, machine translation) is real natural language data such as Web2.0 or speech data. Nevertheless, the NER task is rarely investigated on this type of data which differs severely from formal written text. In this paper, we present 3 new Turkish data sets from different domains (on this focused area; namely from Twitter, a Speech-to-Text Interface and a Hardware Forum) annotated specifically for NER and report our first results on them. We believe, the paper draws light to the difficulty of these new domains for NER and the possible future work.

关键词： Data models Hidden Markov models Twitter Organizations Speech Media Natural language processing

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Calculation and analysis of urban compactness using an integrated ARCGIS tool

Calculation and analysis of urban compactness using an integ...

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2011 International Conference on Future Wireless Networks and Information Systems, ICFWI 2011

作者： Chen, Min Liu, Suxia Yao, Liang Dep. of Computer Science and Technology East China Normal University Shanghai 200241 China

ISBN: (纸本)9783642273254

The form of compact city as an "urban form of sustainable development" is paid more and more attention. This paper proposes several systems of indicators based on the understanding of the connotation of compact city, including population density, land use, characteristics of road network, accessibility, residential density. It also analyzes the corresponding calculation methods. The authors develop an integrated ARCGIS tool, Compactness, built as an extension to the desktop ARCGIS software package, ARCMAP. Undertaking the study of a simulated city- NanLing City with use of the tool of Compactness analyzes the degree of urban compactness in the years of 2000 and 2005. In the end the paper concludes and prospects the measuring methods and the tool of Compactness with a discussion of the future development of urban compactness. © Springer-Verlag 2012.

关键词： Land use

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Analysis of the acoustical environment based on the signals' statistics 12

Analysis of the acoustical environment based on the signals'...

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7th Audio Mostly: A Conference on Interaction with Sound, AM 2012 - In Cooperation with ACM SIGCHI

作者： Georganti, Eleftheria Mourjopoulos, John Electrical and Computer Engineering Dep. Audio and Acoustic Technology Group University of Patras Greece

ISBN: (纸本)9781450315692

In this study, the results of the ongoing work of the authors on the topic of the analysis of the acoustical environment from reverberant signals will be presented. Initially, some theoretical aspects on the relationships of the statistical quantities of the room transfer functions and the reverberant signals will be given. Then, the way that these statistical relationships can assist acoustical scene analysis methods will be discussed. The advantage of the use of twochannel (i.e. binaural) instead of single channel signals will be underlined. Finally, the implementation details of methods for the estimation of various acoustical parameters from signals will be presented. Copyright 2012 ACM.

关键词： Architectural acoustics

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Harvesting energy mostly from acoustic signals 12

Harvesting energy mostly from acoustic signals

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7th Audio Mostly: A Conference on Interaction with Sound, AM 2012 - In Cooperation with ACM SIGCHI

作者： Papadakos, Charalampos Mourjopoulos, John Electrical and Computer Engineering Dep. Audio and Acoustic Technology Group University of Patras 26504 Greece

ISBN: (纸本)9781450315692

Nowadays, numerous daily life applications related to wireless networks, sensors, low power electronics, biomedical applications etc. demand small amount of electrical power for their operation. These applications are rapidly increasing and bringing to the fore the need for small scale electrical power generation. To this end, strong efforts are being made to exploit ambient and man made energy sources such as electromagnetic radiation including sun, infrared and RF radiation, thermal sources, mechanical stress and strain, vibrations, biochemistry etc. Acoustic signals seem to be such an alternative ambient energy source. Firstly, this work gives an overview of the proposed harvesting methods and systems derived from related patent applications during the past decade. Moreover, a first estimation of the available ambient acoustic power density is presented and then is compared to the ambient power density of the aforementioned energy sources. Copyright 2012 ACM.

关键词： Low power electronics

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Novel cloud service for improving world universities ranking

Novel cloud service for improving world universities ranking

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9th International Conference on Information technology, ITNG 2012

作者： Hsieh, Shu-Ming Lo, Suu-An Hsu, Chiun-Chieh Lin, Wei-Chao Dep. Computer Science and Information Engineering Hwa Hsia Institute of Technology Taipei Taiwan Dep. Information Management National Taiwan University of Science and Technology Taipei Taiwan

ISBN: (纸本)9780769546544

The Internet has emerged to be an effective platform for world universities to share their academic outcomes and to show their influence and contribution via constructing rich and easy-to-access web sites. At the same time, Webometrics Ranking of World Universities (WR), proposed by Centre for Scientific Information and Documentation (CSIC), ranks the world universities by the quantity of digital documents available on their web sites and the quality of the web pages measured by the incoming hyperlinks. Therefore, WR is currently recognized as an important index and opportunity for universities willing to promote themselves by the Internet technology. In this paper, we propose a novel cloud-based information providing system for Webometrics Rankings which employs web mining techniques to gather the WR indices from the Internet automatically, and provides useful information in real time for the managers of university web sites. The proposed system is dep.oyed on Microsoft Azure cloud platform in order to give up-to-data and deeper insights of the WR ranking indicators for its users. It utilizes the scalable computation and storage capability of the cloud platform to continually gather the WR index data from the Internet. The proposed system is designed with architecture suitable for cloud-based application such that the period to thoroughly update the WR ranking data is shortened from six months to be within one week. The proposed service model provides a paradigm for constructing cloud-based service of information providing applications. © 2012 IEEE.

关键词： Search engines

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