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Using Bi-clustering Algorithm for Analyzing Online Users Activity in a Virtual Campus

Using Bi-clustering Algorithm for Analyzing Online Users Act...

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International Conference on Intelligent Networking and Collaborative systems (INCOS)

作者： Fatos Xhafa Santi Caballé Leonard Barolli Alberto Molina Rozeta Miho Department of Languages and Informatics Systems Technical University of Catalonia Spain Dept. of Languages and Informatics Systems Technical University of Catalonia Spain Department of Computer Science Multimedia & Telecommunication Open University of Catalonia Spain Dept. of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Faculty of Information Technologies Technical University of Tirana Albania Dept. of Computer Sci. Multimedia & Telecommunication Open University of Catalonia Spain Technical University of Tirana Albania

Data mining algorithms have been proved to be useful for the processing of large data sets in order to extract relevant information and knowledge. Such algorithms are also important for analyzing data collected from the users' activity users. One family of such data analysis is that of mining of log files of online applications that register the actions of online users during long periods of time. A relevant objective in this case is to study the behavior of online users and feedback the design processes of online applications to provide better usability and adaption to users' preferences. The context of this work is that of a virtual campus in which thousands of students and tutors carry out the learning and teaching activity using online applications. The information stored in log files of virtual campuses tend to be large, complex and heterogeneous in nature. Hence, their mining requires both efficient and intelligent processing and analysis of user interaction data during long-term learning activities. In this paper, we present a bi-clustering algorithm for processing large log data sets from the online daily activity of students in a real virtual campus. Our approach is useful to extract relevant knowledge about user activity such as navigation patterns, activities performed as well as to study time parameters related to such activities. The extracted information can be useful not only to students and tutors to stimulate and improve their experience when interacting with the system but also to the designers and developers of the virtual campus in order to better support the online teaching and learning.

关键词： Data mining Web sites Organizations Adaptation model Navigation Registers Context

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Formalization of UML class diagram using description logics

Formalization of UML class diagram using description logics

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International Symposium on Information Technology, ITSim

作者： Lusiana Efrizoni Teknik Informatika Wan M.N. Wan-Kadir Radziah Mohamad Teknik Informatika STMIK-AMIK Riau - Pekanbaru Riau Indonesia STMIK-AMIK Riau-Pekanbaru JI Teknik Informatika Pekanbaru Riau Indonesia Software Engineering Department Universiti Teknologi Malaysia Johor Malaysia Software Engineering Department Universiti Teknologi Malaysia Skudai Johor Malaysia Universiti Teknologi Malaysia Skudai Johor MY Software Engineering Department Faculty of Computer Science and Information Systems Universiti Teknologi Malaysia 81300 UTM Skudai Johor Malaysia

Unified Modelling Language (UML) is as a standard object-oriented modelling notation that is widely accepted and used in software development industry. In general, the UML notation is informally defined in term of natural language description (English) and Object Constraint Language (OCL) which makes difficult to formally analyzed and error-prone. In this paper, we elucidate the preliminary result on an approach to formally define UML class diagram using logic-based representation formalism. We represent how to define the UML class diagram using Description Logics (DLs).

关键词： Unified modeling language Copper Companies Syntactics

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Performance Tuning Towards a KVM-Based Low Latency Virtualization System

Performance Tuning Towards a KVM-Based Low Latency Virtualiz...

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International Conference on Information engineering and computer Science (ICIECS)

作者： Baojing Zuo Kai Chen Alei Liang Haibing Guan Jun Zhang Ruhui Ma Hongbo Yang School of Software Shanghai Jiaotong University Shanghai China School of Information Security Engineering Shanghai Jiaotong University Shanghai China Department of Computer Science and Engineering Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiaotong University Shanghai China

Utilizing virtualization technology to combine real-time operating system(RTOS)and off-the-shelf time-sharing general purpose operating system (GPOS)is attracting much more interest *** combination has the potential to provide a large application base,and to guarantee timely deterministic response to real-time applications,yet there is no convincible experimental result about its real-time *** this paper,we analyze the interrupt latency of RTOS running on Linux KVM based on some preliminary tunings,and find out System Management Interrupt (SMI) is the main factor which makes the maximum latency unideal, so we propose a method to limit the worst-case interrupt latency in an acceptable ***,we also find out that boosting priority may result in wastes of CPU resources when RTOS is not executing real-time tasks,so we design a co-scheduling mechanism to improve the CPU throughput of the GPOS system.

关键词： Linux Real time systems Kernel Tuning Throughput Hardware

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A Translation Framework for Virtual Execution Environment on CPU/GPU Architecture

A Translation Framework for Virtual Execution Environment on...

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International Symposium on Parallel Architectures, Algorithms and Programming (PAAP)

作者： Guoxing Dong Kai Chen Erzhou Zhu Yichao Zhang Zhengwei Qi Haibing Guan School of Software Shanghai Jiaotong University Shanghai China School of Information Security Engineering Shanghai Jiaotong University Shanghai China Department of Computer Science and Engineering Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiaotong University Shanghai China

GPUs are many-core processors with tremendous computational power. However, as automatic parallelization has not been realized yet, developing high-performance parallel code for GPUs is still very challenging. The paper presents a novel translation framework designed for virtual execution environment based on CPU/GPU architecture. It addresses two major challenges of taking advantage of general purpose computation on graphics processing units (GPGPU) to improve performance: no rewriting the existing source code and resolving binary compatibility issues between different GPUs. The translation framework uses semi-automatic parallelization technology to port existing code to explicitly parallel programming models. It not only offers a mapping strategy from X86 platform to CUDA programming model, but also synchronizes the execution between the CPU and the GPUs. The input to our translation framework is parallelizable part of the program within binary code. With an additional information related to the parallelizable part, the translation framework transforms the sequential code into PTX code and execute it on GPUs. Experimental results on several programs from CUDA SDK Code Samples and Parboil Benchmark Suite show that our translation framework could achieve very high performance, even up to several tens of times speedup over the X86 native version.

关键词： Graphics processing unit Registers Kernel Instruction sets Driver circuits Programming computer architecture

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TRACER: A Trace Replay Tool to Evaluate Energy-Efficiency of Mass Storage systems

TRACER: A Trace Replay Tool to Evaluate Energy-Efficiency of...

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IEEE International Conference on Cluster Computing

作者： Zhuo Liu Fei Wu Xiao Qin Changsheng Xie Jian Zhou Jianzong Wang Wuhan National Laboratory of Optoelectronics Key Laboratory of Data Storage Systems Ministry of Education of China School of Computer Science and Tech Huazhong University of Science and Technology Wuhan Hubei China Department of Computer Science and Software Engineering Aubum University Auburn AL USA

Improving energy efficiency of mass storage systems has become an important and pressing research issue in large HPC centers and data centers. New energy conservation techniques in storage systems constantly spring up; however, there is a lack of systematic and uniform way of accurately evaluating energy-efficient storage systems and objectively comparing a wide range of energy-saving techniques. This research presents a new integrated scheme, called TRACER, for evaluating energy-efficiency of mass storage systems and judging energy-saving techniques. The TRACER scheme consists of a toolkit used to measure energy efficiency of storage systems as well as performance and energy metrics. In addition, TRACER contains a novel and accurate workload-control module to acquire power varying with workload modes and I/O load intensity. The workload generator in TRACER facilitates a block-level trace replay mechanism. The main goal of the workload-control module is to select a certain percentage (e.g., anywhere from 10% to 100%) of trace entries from a real-world I/O trace file uniformly and to replay filtered trace entries to reach any level of I/O load intensity. TRACER is experimentally validated on a general RAID5 enterprise disk array. Our experiments demonstrate that energy-efficient mass storage systems can be accurately evaluated on full scales by TRACER. We applied TRACER to investigate impacts of workload modes and load intensity on energy-efficiency of storage devices. This work shows that TRACER can enable storage system developers to evaluate energy efficiency designs for storage systems.

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A Collaborative Decision Support Platform for Product Release Definition

A Collaborative Decision Support Platform for Product Releas...

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International Conference on Internet and Web Applications and Services (ICIW)

作者： Elena Tsiporkova Tom Tourwé Veselka Boeva Software Engineering and ICT group Sirris The Collective Center for the Belgian technological industry Brussels Belgium Computer Systems and Technologies Department Technical University of Sofia Plovdiv Bulgaria Research Fellow of the German Academic Exchange Service (DAAD) Max Planck Institute for Human Development Berlin Germany Computer Systems and Technologies Department Technical University of Sofia-branch Plovdiv Bulgaria

ISBN: (纸本)9781424467280;9780769540221

In this paper, we propose a collaborative decision support platform that supports the product manager in defining the contents of a product release. The platform allows interactive and collaborative decision making by facilitating the exchange of information about product features among individual autonomous stakeholders, providing reputation-enhanced collaboration, ensuring a positive collaboration atmosphere by avoiding public stakeholder ratings and reconciling individual goals with group decisions.

关键词： Collaborative software International collaboration Online Communities/Technical Collaboration Marketing and sales Web and internet services Application software software engineering computer industry Conference management Content management

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Improvement and Performance Evaluation of CAVENET: A Network Simulation Tool for Vehicular Networks

Improvement and Performance Evaluation of CAVENET: A Network...

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International Conference on Distributed Computing systems Workshop

作者： Leonard Barolli Gjergji Mino Fatos Xhafa Arjan Durresi Akio Koyama Department of Information and Communication Engineering Fukuoka Institute of Technology FIT Fukuoka Japan Graduate School of Engineering Fukuoka Institute of Technology FIT Fukuoka Japan Department of Languages and Informatics Systems Technical University of Catalonia Barcelona Spain Department of Computer and Information Science Indiana University Indianapolis IN USA Department of Informatics Graduate School of Science and Engineering Yamagata University Yonezawa Yamagata Japan

Vehicle Ad-hoc Network (VANET) is a kind of Mobile Ad-hoc Network (MANET) that establishes wireless connection between cars. In VANETs and MANETs, the topology of the network changes very often, therefore implementation of efficient routing protocols is very important problem. In MANETs, the Random Waypoint (RW) model is used as a simulation model for generating node mobility pattern. On the other hand, in VANETs, the mobility patterns of nodes is restricted along the roads, and is affected by the movement of neighbour nodes. In this paper, we present a simulation system for VANET called CAVENET (Cellular Automaton based Vehicular NETwork). In CAVENET, the mobility patterns of nodes are generated by an 1-dimensional cellular automata. We improved CAVENET and implemented some routing protocols. We investigated the performance of the implemented routing protocols by CAVENET. The simulation results have shown that DYMO protocol has better performance than AODV and OLSR protocols.

关键词： Routing protocols Vehicles Mobile ad hoc networks Mathematical model Analytical models

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engineering self-coordinating software intensive systems

Engineering self-coordinating software intensive systems

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FSE/SDP Workshop on the Future of software engineering Research, FoSER 2010

作者： Schäfer, Wilhelm Birattari, Mauro Blömer, Johannes Dorigo, Marco Engels, Gregor O'Grady, Rehan Platzner, Marco Rammig, Franz Reif, Wolfgang Trächtler, Ansgar Heinz Nixdorf Institute University of Paderborn Fürstenallee 11 Paderborn Germany Heinz Nixdorf Institute University of Paderborn Pohlweg 98 Paderborn Germany Heinz Nixdorf Institute University of Paderborn Warburger Str. 100 Paderborn Germany Department of Computer Science University of Paderborn Warburger Str. 100 Paderborn Germany Department of Control Engineering and Mechatronics University of Paderborn Pohlweg 98 Paderborn Germany IRIDIA CoDE Université Libre de Bruxelles Ave. F. Roosevelt 50 1050 Brussels Belgium Department of Software Engineering and Programming Languages University of Augsburg Universitätsstr. 6a Augsburg Germany

ISBN: (纸本)9781450304276

It my great pleasure and honor to welcome you to FoSER 2010: The FSE/SDP Workshop on the Future of software engineering Research. This workshop was organized in collaboration with and made possible by generous support from the software Design and Productivity Coordinating Group (SDP) of the U.S. National Coordination Office (NCO) for Networking and Information Technology Research and Development (NITRD), and the National Science Foundation (NSF). This one-time, international working conference has brought together top academic and industrial researchers and government research funding agency personnel from around the world to engage in an extended discussion of consequential new ideas about the future of our field. The ideas produced by this workshop will be disseminated in two forms. First, the position papers accepted by the program committee will be published in a companion to the Proceedings of FSE-18. Second, the workshop findings will be published subsequently in a special report by NITRD/SDP. The call for papers for FoSER 2010 solicited 4-page position papers with new ideas about the future of software and software-reliant systems, and the research that will be needed to meet future needs. Papers were expected to be creative and thought-provoking, and to articulate compelling new perspectives, positions, problem formulations, assumptions and approaches. The workshop did not seek, and did not accept, technical research papers or abstracts. The workshop received a total of 139 position papers. Of these, 90 papers (65%) were accepted. Each paper was reviewed by at least two members of the workshop program committee. The committee was asked to accept all papers presenting significant new ideas about how our field should move forward. Copyright 2010 ACM.

关键词： software design

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Impact of Mobile Event Movement on the Performance of Wireless Sensor Networks

Impact of Mobile Event Movement on the Performance of Wirele...

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International Conference on systems and Networks Communications (ICSNC)

作者： Tao Yang Leonard Barolli Gjergji Mino Fatos Xhafa Arjan Durresi Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Graduate School of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Languages and Informatics Systems Technical University of Catalonia Barcelona Spain Department of Computer and Information Science Indiana University-Purdue University Indianapolis Indianapolis IN USA

In this paper, we investigate how the sensor network performs in the case when the event moves with special movement path. We compare the simulation results for four scenarios: when the event is stationary, moving randomly, moving with simple 4 path and boids path. The simulation results have shown that for the case when event is moving randomly the performance is the worst in the four scenarios. The characteristic of goodput decreases with the increase of number of sensor nodes. In the case of boids model, the gooput is unstable when the Tr is lower than 10 pps. The consumed energy characteristic increases with the increase of Tr. Simulation results show that the consumed energy of random movement is the worst among four scenarios. The consumed energy of boids model is the lowest in four cases. This shows that the event movement with boids model can decrease the consumed energy in the large scale WSNs.

关键词： Biological system modeling Wireless sensor networks Simulation Robot sensing systems Routing protocols Trajectory Lattices

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An Intelligent Fuzzy-Based Cluster Head Selection System for WSNs and Its Performance Evaluation for D3N Parameter

An Intelligent Fuzzy-Based Cluster Head Selection System for...

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

作者： Hironori Ando Leonard Barolli Arjan Durresi Fatos Xhafa Akio Koyama Graduate School of Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Department of Computer and Information Science Indiana University-Purdue University Indianapolis Indianapolis IN USA Department of Languages and Informatics Systems Technical University of Catalonia Barcelona Spain Department of Informatics Yamagata University Yonezawa Yamagata Japan

Cluster formation and cluster head selection are important problems in sensor network applications and can drastically affect the network's communication energy dissipation. However, selecting of the cluster head is not easy in different environments which may have different characteristics. In our previous work, in order to deal with this problem, we proposed a power reduction algorithm for sensor networks based on fuzzy logic and number of neighbour nodes. We call this algorithm F3N. In this paper, we evaluate F3N and LEACH by some simulation results. From the simulation results, we found that the probability of a not to be a cluster head is increased with increase of number of neighbour nodes and remained battery power decrease of distance from the cluster centroid.

关键词： Simulation Clustering algorithms Mercury (metals) Manganese Fuzzy logic Wireless sensor networks Batteries

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