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A new method of DDB logical structure synthesis using distributed tabu search

A new method of DDB logical structure synthesis using distri...

引用

international Workshop on Soft computing applications and Knowledge Discovery 2011, SCAKD 2011 - In Conjunction with the 4th international conference on Pattern Recognition and Machine Intelligence, PReMI 2011

作者： Babkin, Eduard Karpunina, Margarita National Research University Higher School of Economics Dept. of Information Systems and Technologies Bol. Pecherskaya 25 6030155 Nizhny Novgorod Russia

In this paper we propose a parallel tabu search algorithm based on the consecutive tabu algorithm constructed by us earlier to solve the problem of the distributed database optimal logical structure synthesis. Also we provide a reader with some information about the performance of our new parallel algorithm and the quality of the solutions obtained with help of it.

关键词： Neural networks

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Data Mining on Grids

Data Mining on Grids

引用

4th international conference on Contemporary computing

作者： Chakraverty, Shampa Gupta, Ankuj Goyal, Akhil Singal, Ashish Netaji Subhas Inst Technol Dept Comp Engn New Delhi 110078 India

ISBN: (纸本)9783642226052

Data mining algorithms are widely used today for the analysis of large corporate and scientific datasets stored in databases and data archives. Industry, science and commerce fields often need to analyze very large datasets maintained over geographically distributed sites by using the computational power of distributed and parallel systems. Grid computing emerged as an important new field of distributed computing, which could support the distributed knowledge discovery applications. In this paper, we have proposed a method to perform Data Mining on Grids. the Grid has been setup using Foster and Kesselman's Globus Toolkit, which is the most widely used middleware in scientific and data intensive grid applications. For the development of data mining applications on grids we have used Weka4WS. Weka4WS is an open source framework extended from the Weka toolkit for distributed data mining on Grid, which deploys many of machine learning algorithms provided by Weka Toolkit. To evaluate the efficiency of the proposed system, a performance analysis of Weka4WS by executing distributed data mining tasks, namely clustering and classification, in grid scenario has been performed. At last, a study on the speed up obtained by doing data mining on grids is done.

关键词： Weka4WS distributed Data Mining Grid computing Classification Clustering Grid

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Mobile element path planning for gathering transit-time constrained data

Mobile element path planning for gathering transit-time cons...

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2011 12th international conference on parallel and distributed computing, applications and technologies, PDCAT 2011

作者： Almi'ani, Khaled Viglas, Anastasios Aalsalem, Mohammed Faculity of Information Technology Al Hussein Bin Talal University Maan Jordan School of Information Technologies University of Sydney NSW 2006 Australia Faculty of Computer and Information System Jazan University Saudi Arabia

ISBN: (纸本)9780769545646

In this paper we investigate the problem of gathering the data in wireless sensor network using a single Mobile Element. In particular we consider the case where the data are produced by measurements and they need to be delivered to a predefined sink within a given time interval from the time the measurement takes place. A mobile element travels the network in predefined paths, collect the data from the nodes, and deliver them to the sink by a single long-distance transmission. In this problem, the length of the mobile element path is bounded by pre-determined length. this path will visit a subset of the nodes. these selected nodes will work as caching points and will aggregate the other nodes'data. the caching point nodes are selected with the aim of reducing the energy expenditures due to multi-hop forwarding. We provide a heuristic-based solution for this problem. We evaluate the performance of our algorithm by comparing it to the optimal solution as well as the best wellknown algorithms from the literature. © 2011 IEEE.

关键词： Motion planning

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Optimization of Aircraft Wake Alleviation Schemes through an Evolution Strategy

Optimization of Aircraft Wake Alleviation Schemes through an...

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9th international conference on High Performance computing for Computational Science

作者： Chatelain, Philippe Gazzola, Mattia Kern, Stefan Koumoutsakos, Petros ETH Chair Computat Sci CH-8092 Zurich Switzerland

ISBN: (纸本)9783642193279

We investigate schemes to accelerate the decay of aircraft trailing vortices. these structures are susceptible to several instabilities that lead to their eventual destruction. We employ an Evolution Strategy to design a lift distribution and a lift perturbation scheme that minimize the wake hazard as proposed in [6]. the performance of a scheme is measured as the reduction of the mean rolling moment that would be induced on a following aircraft;it is computed by means of a Direct Numerical Simulation using a parallel vortex particle code. We find a configuration and a perturbation scheme characterized by an intermediate wavelength lambda similar to 4.64, necessary to trigger medium wavelength instabilities between tail and flap vortices and subsequently amplify long wavelength modes.

关键词： Large Scale Simulations in CS&E parallel and distributed computing Numerical Algorithms for CS&E

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Dynamically accessing packet header fields at high-speed

Dynamically accessing packet header fields at high-speed

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2011 12th international conference on parallel and distributed computing, applications and technologies, PDCAT 2011

作者： Duncan, Ralph Jungck, Peder Ross, Kenneth CloudShield Technologies SAIC company Sunnyvale CA United States

ISBN: (纸本)9780769545646

A significant part of packet processing consists of detecting whether certain standard protocol headers are present, where they are located and whether they include optional information. Packet processing programs are on tight time budgets, especially to handle speeds in the gigabits per second (gbps) range. thus, high-speed mechanisms for finding and accessing headers are critical. Our approach lets users define headers as C-style structures in a highlevel language, packetC [1], and specify header locations in terms of offsets from the start of the current packet, which is treated as an array of unsigned bytes. these offsets can be expressed in terms of network layer offsets, constant values, runtime-calculated variables and combinations of all of these. this paper focuses on the principal forms these offset expressions can take and on how our FPGAs (Field Programmable Gate Arrays), compiler and interpreter collectively handle them at runtime. For simple and complex header offset scenarios we provide users with intuitive, high-level ways to describe offsets and provide effective runtime mechanisms to access header fields. © 2011 IEEE.

关键词： Network layers

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Digital Information and Communication Technology and Its applications 2011

引用

丛书名： Communications in Computer and Information Science

2011年

作者： Hocine Cherifi Jasni Mohamad Zain Eyas El-Qawasmeh

ISBN: (数字)9783642219849

ISBN: (纸本)9783642219832

this two-volume set CCIS 166 and CCIS 167constitutes the refereed proceedings of the international conference on Digital Information and Communication Technology and its applications, DICTAP 2011, held in Dijon, France, in June 2010. the 128 revised full papers presented in both volumes were carefully reviewed and selected from330 submissions. the papers are organized in topical sections on Web applications; image processing; visual interfaces and user experience; network security; ad hoc network; cloud computing; Data Compression; Software Engineering; Networking and Mobiles; distributed and parallel processing; social networks; ontology; algorithms; multimedia; e-learning; interactive environments and emergent technologies for e-learning; signal processing; information and data management.

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CHMasters: A scalable and speed-efficient metadata service in distributed file system

CHMasters: A scalable and speed-efficient metadata service i...

引用

2011 12th international conference on parallel and distributed computing, applications and technologies, PDCAT 2011

作者： Xu, Min Zhou, Junrui Zhou, Wei An, Hong Department of Computer Science and Technology University of Science and Technology Hefei 230026 China Key Laboratory of Computer System and Architecture Chinese Academy of Sciences Beijing 100080 China

ISBN: (纸本)9780769545646

distributed file system (DFS) is playing important roles of supporting large distributed data-intensive applications to meet storage needs. Typically, the design of DFS, such as GFS in Google, DMS in Cisco and TFS in Alibaba, is driven by observations of specific application workloads, internal demands and technological environment. In such systems, the metadata service is a critical factor that can affect the file system performance and availability to a great degree. Five requirements have been summarized for the metadata service: location transparent file service, smart director, efficient speed, strong scalability and friendly collaborator. In this paper, we present metadata service module called CHMasters in our DFS. Consistent hashing protocol is used to relieve potential hot spots on name servers. Files'metadata and master nodes are mapped into the same hash space by consistent hash function. And then files'metadata are scattered to master nodes by clockwise "closest" principle. Chunkserver acts as a client when report its chunks info. Only a small proportion of files'metadata will be rehashed when master nodes state change. A new scalable file mapping strategy is also proposed to map file sizes from few MB to several GB efficiently. After intensive experiments, it shows CHMasters is satisfying the above five requirements. © 2011 IEEE.

关键词： Metadata

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A Massively parallel Dense Symmetric Eigensolver with Communication Splitting Multicasting Algorithm

A Massively Parallel Dense Symmetric Eigensolver with Commun...

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9th international conference on High Performance computing for Computational Science

作者： Katagiri, Takahiro Itoh, Shoji Univ Tokyo Ctr Informat Technol Bunkyo Ku 2-11-16 Yayoi Tokyo 1138658 Japan RIKEN Adv Ctr Comp & Commun Saitama Japan

ISBN: (纸本)9783642193279

In this paper. we propose a process grid free algorithm for a massively parallel dense symmetric eigensolver with a communication splitting multicasting algorithm. In this algorithm, a tradeoff exists between speed and memory space to keep the Householder vectors. As a result of a performance evaluation with the T2K Open Supercomputer (U. Tokyo) and the RX200S5, we obtain the performance with 0.86x and 0.95x speed-downs and 1/2 memory space compared to the conventional algorithm for a square process grid. We also show a new algorithm for small-sized matrices in massively parallel processing that takes an appropriately small value of p of the process grid p x q. In this case, the execution time of inverse transformation is negligible.

关键词： parallel and distributed computing numerical algorithms for CS&E

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Advances in parallel, distributed computing 2011

引用

丛书名： Communications in Computer and Information Science

2011年

作者： Dhinaharan Nagamalai Eric Renault Murugan Dhanuskodi

ISBN: (数字)9783642240379

ISBN: (纸本)9783642240362

this book constitutes the refereed proceedings of the First international conference on Advances in parallel, distributed computing technologies and applications, PDCTA 2011, held in Tirunelveli, India, in September 2011. the 64 revised full papers were carefully reviewed and selected from over 400 submissions. Providing an excellent international forum for sharing knowledge and results in theory, methodology and applications of parallel, distributed computing the papers address all current issues in this field with special focus on algorithms and applications, computer networks, cyber trust and security, wireless networks, as well as mobile computing and bioinformatics.

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the low-cost secure sessions of access control model for distributed applications by public personal smart cards

The low-cost secure sessions of access control model for dis...

引用

2011 17th IEEE international conference on parallel and distributed Systems, ICPADS 2011

作者： Chen, Kuo-Yi Lin, Chin-Yang Hou, Ting-Wei Academia Sinica Institute of Information Science Taipei Taiwan Department of Engineering Science National Cheng Kung University Tainan Taiwan

ISBN: (纸本)9780769545769

the secure requirement of modern information systems is increasing significantly nowadays, especially in cloud computing with distributed applications. Among secure mechanisms of an organization, the access control (AC) is a foundation for modern information systems. In order to reach an effective and flexible approach of access control, the Rolebased Access Control (RBAC) models are widely deployed in organizations. Comparing with traditional discretionary access control (DAC) and mandatory access control (MAC), the userrole- subject mapping of a RBAC model provides effective permissions assignments for access control of an organization. However, the RBAC sessions could be stretched over multiple distributed servers in cloud computing. the traversed sessions between servers could be modified, monitored and attacked by modern hacker techniques, and become secure leaks in RBAC models. In order to ensure secure sessions in cloud computing, various encryption approaches are used. Among these encryption approaches, the use of digital certificates by asymmetric encryption methods could be an appropriate solution to ensure the security of RBAC sessions. However, the cost of public/private keys management and issuing an appropriate certificate tokens for each member in organizations could be very expensive. the high cost might block the deployment of secure RBAC sessions, and then reduce the secure level of organizations. In order to improve this issue, a low-cost approach of secure sessions for RBAC models is proposed in this paper. the personal smart cards can be used as a certificate tokens in RBAC models to reach effective user authentications. Moreover, each session of RBAC models, including user-role-subject assignments and contentbased accesses, can be protected by digital certificates which is generated by user own smart cards. thus the security of RBAC sessions can be improved significantly. It is worth noting that personal smart cards are issued by public departm

关键词： Authentication

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