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检索条件"任意字段=2009 International Conference on Computer Technology and Development, ICCTD 2009"

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Social context: Supporting interaction awareness in ubiquitous environments

Social context: Supporting interaction awareness in ubiquito...

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international conference on Mobile and Ubiquitous Systems: Networking and Services (MobiQuitous)

作者： Minh H. Tran Jun Han Alan Colman Faculty of Information and Communication Technologies Swinburne University of Technology Hawthorn VIC Australia

In ubiquitous computing environments, certain entities (or actors) often need to interact with each other in achieving a joint goal in a dynamically changing context. To perform such interactions in a seamless manner, the actors need to be aware of not only their physical context (e.g. location) but also their changing relationships with respect to the particular task or goal. The latter interaction-oriented context, which we refer to as social context, has significant impacts on the way actors manage their adaptive behavior. However, very little research has focused on supporting such social context in ubiquitous environments. This paper presents our novel approach to modeling and realizing social context. Social context is modeled as a managed composition of loosely-coupled roles with their interaction relationships expressed as contracts. In addition, it is modeled from an individual actor's perspective to allow for possible differences in the actors' perception of the relationships. The social contexts of an actor are externalized from the actor itself to achieve easy management of the actors' adaptive behavior concerning interaction. A layered system architecture is introduced to realize the approach and demonstrate the development of automotive telematics systems that are physically and socially context-aware.

关键词： Context awareness Context modeling Ubiquitous computing Collaboration computer Society Contracts computer architecture Automotive engineering Telematics Pervasive computing

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Experimental Comparisons of Clonal Selection Algorithms with Different Metadynamics Strategies

Experimental Comparisons of Clonal Selection Algorithms with...

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2009 Fourth international conference on Bio-Inspired Computing:Theories and Applications(BIC-TA2009)

作者： Xingxin Pei1,2,Wenjian Luo1,2,Zhifang Li1,2,Baoliang Xu1,2 and Xufa Wang1,2 1 Nature Inspired Computation and Application Laboratory,School of computer Science and technology,University of Science and technology of China,Hefei 230027,Anhui,China 2 Anhui Key Laboratory of Software in Computing and Communication,University of Science and technology of China,Hefei 230027,China

Metadynamics is an important operator of Clonal Selection Algorithms(CSAs),which is considered as an embedded mechanism to increase the population *** the binary space,the traditional metadynamics usually adopts an equal probability to generate 0 and 1 for each bit of the ***,for some problems,such a metadynamics could not really increase the population *** this paper,four different metadynamics strategies including the traditional metadynamics strategy and three novel metadynamics strategies are tested by experiments to compare their impacts on the performance of *** experimental results demonstrate that CSAs without and with different metadynamics strategies could have different performance.

关键词： Experimental Comparisons of Clonal Selection Algorithms with Different Metadynamics Strategies CSA

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Quality prediction model of object-oriented software system using computational intelligence

Quality prediction model of object-oriented software system ...

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Workshop on Power Electronics and Intelligent Transportation System, PEITS

作者： Cong Jin Shu-Wei Jin Jun-Min Ye Qing-Guo Zhang Department of Computer Science Central China Normal University Wuhan China The School of Physics & Technology Wuhan University of China Wuhan China

Effective prediction of the fault-proneness plays a very important role in the analysis of software quality and balance of software cost, and it also is an important problem of software engineering. Importance of software quality is increasing leading to development of new sophisticated techniques, which can be used in constructing models for predicting quality attributes. In this paper, we use fuzzy c-means clustering (FCM) and radial basis function neural network (RBFNN) to construct prediction model of the fault-proneness, RBFNN is used as a classificatory, and FCM is as a cluster. Object-oriented software metrics are as input variables of fault prediction model. Experiments results confirm that designed model is very effective for predicting a class's fault-proneness, it has a high accuracy, and its implementation requires neither extra cost nor expert's knowledge. It also is automated. Therefore, proposed model was very useful in predicting software quality and classing the fault-proneness.

关键词： Object oriented modeling Predictive models Software systems Computational intelligence Software quality Costs Software engineering Fuzzy neural networks Radial basis function networks Software metrics

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Design and development of a Distributed Tabletop System Using EBITA Framework

Design and Development of a Distributed Tabletop System Usin...

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international conference on Ubiquitous Information Technologies and Applications (ICUT)

作者： Minyoung Kim Yongjoo Cho Kyoung Shin Park Department of Computer Science Sangmyung University South Korea Division of Digital Media Technology Sangmyung University South Korea Department of Multimedia Technology Dankook University South Korea

Over the past decade, tabletop systems are becoming more popular. However, prior works on tabletop system have mostly focused on supporting user interactions with digital contents on one single tabletop display, which are not easily extendable. In this paper we present a new scalable distributed tabletop system consisted of master/slave computer and tangible interfaces to provide high-resolution interactive tabletop display surfaces. Our work is to develop a tabletop system constructed with LCD panels and a cluster of low-cost commodity PCs to support a large high-resolution scalable tiled display. It also employs the tangible user interface using the infrared camera tracking and tangible blocks to support intuitive user interaction on the tabletop surface. In this research, EBITA (Environment for Building Interactive Tangible Applications) framework is developed to support various modules necessary for easy construction of any interactive high-resolution applications that run on the distributed tabletop system. This paper briefly describes the design of EBITA framework and detail implementations of the current prototype of distributed tabletop system. Then it demonstrates two applications developed using EBITA framework: 2D high-resolution image viewer and 3D block crash game.

关键词： computer displays Liquid crystal displays Master-slave computer interfaces Distributed computing Personal communication networks User interfaces Cameras Buildings Modular construction

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Exploring user's habits and virtual communities to improve IP-connectivity management

Exploring user's habits and virtual communities to improve I...

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international conference on Ultra Modern Telecommunications and Workshops (ICUMT)

作者： Roberto Rigolin Ferreira Lopes Roberto Sadao Yokoyama Bruno Yuji Lino Kimura Pravin Pawar Bert-Jan van Beijnum Edson dos Santos Moreira University of Twente Enschede Netherlands University of São Paulo Sao Paulo Brazil

A wireless connectivity island is a geographic area covered by a particular wireless ISP. Nowadays, mobile users possessing multi-homing mobile devices can have IP-connectivity almost everywhere, while being on the move. In terms of vertical handover, these users jump from a connectivity island to another that could differ by communication technology, access provider, QoS conditions and price. The mechanisms for vertical handover rely on broadcasted information or on QoS status of the wireless environment to comply with the applications requirements and user's preferences. In this paper, we propose a complementary approach to improve the accuracy and handiness of the network information typically used in the vertical handover solutions. Since the mobile users are not always on the move, we try to identify certain user states in a context-aware manner and trigger appropriated connectivity management tasks. While the user is on the move, we retrieve and store user's connectivity experiences through a route, aggregating time and location to represent a habit. Theses experiences are shared as feedback in virtual communities in order to reach potentially interested people who share similar movements. Moreover, we describe the key points of the implementation of a prototype called wireless footprinting and discuss some quantitative experiments in a testbed with mobile IPv6.

关键词： Mobile computing Power supplies Batteries Feedback computer networks Decision making Wireless LAN Web and internet services Wireless networks Standards development

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A case for P2P infrastructure for social networks - opportunities & challenges

A case for P2P infrastructure for social networks - opportun...

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Annual conference on Wireless On Demand Network Systems and Services (WONS)

作者： Sonja Buchegger Anwitaman Datta Deutsche Telekom Research and Development Laboratories Berlin Germany Centre of Advanced Information Systems School of Computer Engineering NTU Singapore Singapore

Online Social Networks like Facebook, MySpace, Xing, etc. have become extremely popular. Yet they have some limitations that we want to overcome for a next generation of social networks: privacy concerns and requirements of Internet connectivity, both of which are due to web-based applications on a central site whose owner has access to all data. To overcome these limitations, we envision a paradigm shift from client-server to a peer-to-peer infrastructure coupled with encryption so that users keep control of their data and can use the social network also locally, without Internet access. This shift gives rise to many research questions intersecting networking, security, distributed systems and social network analysis, leading to a better understanding of how technology can support social interactions. This paper is an attempt to identify the core functionalities necessary to build social networking applications and services, and the research challenges in realizing them in a decentralized setting. In the tradition of research-path defining papers in the peer-to-peer community, we highlight some challenges and opportunities for peer-to-peer in the era of social networks. We also present our own approach at realizing peer-to-peer social networks.

关键词： Social network services Peer to peer computing Privacy Cryptography Data mining Internet Probability density function

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Software Risk Management

Software Risk Management

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international conference on Information Management and Engineering, ICIME

作者： Shehnila Zardari Department of Computer Science & IT NED University of Engineering & Technology Karachi Pakistan

ISBN: (纸本)9781424437740

Building and maintaining software is a risky business. Since software permeates and controls so much of the present-day enterprise (and its products), delay, cost excess, and failure to fulfill a command, can have far-reaching consequences. A common response to such risk is to ignore it completely. We justify this as "positive approach," the heart and soul of a Can-Do management philosophy. But when real risks turn into real problems and throw our projects down in flames, we can see that our past "positive approach" was little more than repudiation. There should be a better *** the core activities, the must-be-dones of software development, is an essential but not sufficient beginning. Given that projects never run just exactly as the optimal plan, we need risk management as well. Risk management is project management for adults. It keeps your attention focused constructively on the very characteristics that, if overlooked, could lead to disastrous collapse of the project.A policy of risk aversion guides us to become more and more efficient and to avoid things that are less and less worth doing. The projects that yield real benefit are destined to be full of risk. Running away from risk will not prove to be useful instead we need to school ourselves to run toward it, but very, very *** high benefit endeavors are always risky, we have to make ways to find out the lurking risks, estimate their effect, optimize our response, and keep an eye on the changes. These are the vital skills of risk management.

关键词： Risk management Project management Risk analysis Maintenance engineering Software maintenance Costs Programming Software tools Hazards Information analysis

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Execution Anomaly Detection in Distributed Systems through Unstructured Log Analysis

Execution Anomaly Detection in Distributed Systems through U...

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IEEE international conference on Data Mining (ICDM)

作者： Qiang Fu Jian-Guang Lou Yi Wang Jiang Li Microsoft Research Asia Beijing China Department of Computer Science & Technology Beijing University of Posts and Telecommunications Beijing China

Detection of execution anomalies is very important for the maintenance, development, and performance refinement of large scale distributed systems. Execution anomalies include both work flow errors and low performance problems. People often use system logs produced by distributed systems for troubleshooting and problem diagnosis. However, manually inspecting system logs to detect anomalies is unfeasible due to the increasing scale and complexity of distributed systems. Therefore, there is a great demand for automatic anomalies detection techniques based on log analysis. In this paper, we propose an unstructured log analysis technique for anomalies detection. In the technique, we propose a novel algorithm to convert free form text messages in log files to log keys without heavily relying on application specific knowledge. The log keys correspond to the log-print statements in the source code which can provide cues of system execution behavior. After converting log messages to log keys, we learn a Finite State Automaton (FSA) from training log sequences to present the normal work flow for each system component. At the same time, a performance measurement model is learned to characterize the normal execution performance based on the log messages' timing information. With these learned models, we can automatically detect anomalies in newly input log files. Experiments on Hadoop and SILK show that the technique can effectively detect running anomalies.

关键词： Large-scale systems Learning automata Measurement Timing

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Invited Seminar

Invited Seminar

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international conference on Mobile Data Management

作者： Ling Liu Georgia Institute of Technology USA

This tutorial presents the definition, the models and the techniques of location privacy from the data privacy perspective. By reviewing and revising the state of art research in data privacy area, the presenter describes the essential concepts, the alternative models, and the suite of techniques for providing location privacy in mobile and ubiquitous data management systems. The tutorial consists of two main components. First, we will introduce location privacy threats and give an overview of the state of art research in data privacy and analyze the applicability of the existing data privacy techniques to location privacy problems. Second, we will present the various location privacy models and techniques effective in either the privacy policy based framework or the location anonymization based framework. The discussion will address a number of important issues in both data privacy and location privacy research, including the location utility and location privacy trade-offs, the need for a careful combination of policy- based location privacy mechanisms and location anonymization based privacy schemes, as well as the set of safeguards for secure transmission, use and storage of location information, reducing the risks of unauthorized disclosure of location information. The tutorial is designed to be self-contained, and gives the essential background for anyone interested in learning about the concept and models of location privacy, and the principles and techniques for design and development of a secure and customizable architecture for privacy-preserving mobile data management in mobile and pervasive information systems. This tutorial is accessible to data management administrators, mobile location based service developers, and graduate students and researchers who are interested in data management in mobile information systems, pervasive computing, and data privacy.

关键词： Seminars Data privacy Art Management information systems Mobile computing Data analysis Secure storage computer architecture Information management Pervasive computing

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The Effect of Spreading Factor on Network Lifetime and Energy Consumption Rate of Low Energy Adaptive Clustering Hierarchy (LEACH)

The Effect of Spreading Factor on Network Lifetime and Energ...

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international conference on Advances in Computing, Control, & Telecommunication Technologies (ACT)

作者： Bhaskar P. Deosarkar Narendra Singh Yadav R.P. Yadav Department of Electronics and Communication Engineering Malaviya National Institute of Technology Jaipur India

Clustering is a widely discussed as an important architecture for data centric wireless sensor networks. Low energy adaptive clustering hierarchy (LEACH), proposed in past, is used as benchmark scheme by many proposals and its performance is widely studied in the literature, over last few years. The probabilistic and randomized clusterhead selection strategy results in variable number of clusterheads during different rounds of data gathering. To avoid communication interference in different clusters the signals need to be spread which results in increased data size. The variable number of clusterheads requires spreading factor to be set corresponding to the probable maximum number of clusterheads, to avoid collisions. This increases the data size and correspondingly the amount of energy required to transmit it to the base station. This directly affect the network lifetime and energy consumption of the sensor nodes, which are treated as important performance metrics for evaluation of many of the schemes proposed, in the literature, for data gathering in such networks. To study the effect of spreading factor on these performance metrics, LEACH scheme was simulated in NS-2. With the results obtained 8 is observed as an optimum value of the spreading factor for the simulated scenario, to achieve the desired performance in terms of network lifetime and energy consumption rate which demands development of a distributed clustering scheme with exactly equal number of clusterheads, during different rounds of data gathering.

关键词： Energy consumption Wireless sensor networks Measurement Base stations computer networks Telecommunication computing Communication system control Telecommunication control Programmable control Adaptive control

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