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检索条件"机构=Dept. of Computer Science& Software Engineering"

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A Comparative Study on Differential Evolution with Other Heuristic Methods for Continuous Optimization

A Comparative Study on Differential Evolution with Other Heu...

引用

Mediterranean Conference on Control & Automation

作者： Guido Maione Antonio Punzi Kang Li Dept. of Electrical and Information Engineering Technical University of Bari ISS Innovative Software Services GmbH School of Electronics Electrical Engineering and Computer Science Queen's University of Belfast

ISBN: (纸本)9781479909964

In this paper, we describe an optimization method based on differential evolution (DE). It shows good convergence properties with few parameters. However, the appropriate selection of the parameters is a difficult task. Hence, we here analyze the performance indexes of the DE algorithm to set the control parameters. Moreover, to identify the best parameter intervals, the DE approach is first compared to two different Particle Swarm Optimization (PSO) algorithms and then to a recent adaptive genetic algorithm (DABGA). The optimization of benchmark functions shows that the DE algorithm performs better than PSO and DABGA methods.

关键词： Sociology Statistics Optimization Convergence Genetic algorithms Vectors Market research

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Visualization of movie features in collaborative filtering

Visualization of movie features in collaborative filtering

引用

12th IEEE International Conference on Intelligent software Methodologies, Tools and Techniques, SoMeT 2013

作者： Nemeth, Bottyan Takacs, Gabor Pilaszy, Istvan Tikk, Domonkos Gravity Research and Development Zrt. Bálint M. u. 64. Gyor Hungary Dept. of Mathematics and Computer Science Széchenyi István University Egyetem tér 1. Gyor Hungary Óbuda University Software Engineering Institute Bécsi út 96/b Budapest Hungary

ISBN: (纸本)9781479904211

In this paper we will describe a modification of the matrix factorization (MF) algorithm which allows visualizing the user and item characteristics. When applying MF for collaborative filtering, we get a model that represents the attributes of users and items by feature vectors. Some elements of these vectors may have understandable meaning for humans but due to the lack of internal connections between the feature vectors, these are difficult to visualize. In this paper we give a detailed description of a MF method enabling better visualization of features by arranging them into a 2D map, where via the calculation of the feature values we try to position features with similar 'meaning' close to each other. To achieve this first we define a neighborhood relation on features, then we modify the MF so that we introduce a new term in the error function which penalize the difference between the neighbor features. We show that this modification slightly decrease the accuracy of the model but we get well visualized feature maps. On the feature maps meanings can be associated with regions, and so we can provide an interesting explanation for the user why he/she was recommended the movie. Such plausible explanations may result in that users will better understand how the system works, which can also increase customer loyalty towards the service provider. © 2013 IEEE.

关键词： Collaborative filtering

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A hybrid mobility model based on social, cultural and language diversity

A hybrid mobility model based on social, cultural and langua...

引用

International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom)

作者： Lutful Karim Qusay H. Mahmoud School of Information & Communications Technology Seneca College of Applied Arts and Science Toronto ON Canada Dept. Electrical Computer and Software Engineering University of Ontario Institute of Technology Oshawa ON Canada

Human Mobility Models (HMMs) have become increasingly relevant in different application domains including networks designed for data dissemination protocols. Most existing HMMs consider the temporal and spatial features of human mobility. In addition, many recent HMMs based on social networks have begun to take into account social factors, which naturally influence the results of the HMMs. Unfortunately, these mobility models do not focus on the impact of several important social factors that can affect a person's actions, such as language, citizenship, and culture. This paper introduces a hybrid human mobility model that integrates social behavior, cultural and language factors into HMMs in order to measure their effect on human mobility, as well as temporal and spatial features. Results demonstrate the feasibility of the proposed model.

关键词： Hidden Markov models Communities Cultural differences Data models Protocols Social network services Global communication

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Of Massive Static Analysis Data

Of Massive Static Analysis Data

引用

IEEE International Conference on software Security and Reliability Companion

作者： Aurelien Delaitre Vadim Okun Elizabeth Fong Dept. of Computer Science and Electrical Engineering West Virginia University Morgantown WV 26506 USA Software and Systems Division IT Laboratory National Institute of Standards and Technology Gaithersburg MD 20899 USA

ISBN: (纸本)9781479929269

The software Assurance Metrics and Tool Evaluation (SAMATE) project at the National Institute of Standards and Technology (NIST) has organized four Static Analysis Tool Expositions (SATE). SATE is designed to advance research in static analysis tools that find security-relevant defects in source code. Briefly, participating tool makers run their tools on a set of programs. Researchers led by NIST analyze the tool outputs. The results and experiences are reported at a workshop. These expositions have accumulated large amounts of data. This collection allowed for the development and validation of practical metrics in regard to static analysis tool effectiveness and independence. In this paper, we discuss the role of the data in determining which metrics can be derived. Specifically, we detail the three characteristics test data should exhibit and explain why the data we use express each combination of two out of these three properties.

关键词： software metrics static analysis tools security weaknesses tool effectiveness tool independence

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Performance Evaluation of Stack-Protocols, Encapsulation Methods and Video Codecs for Live Video Streaming

Performance Evaluation of Stack-Protocols, Encapsulation Met...

引用

International Conference of Information and Communication Technology

作者： Afaq Iqbal Fahim Arif Nasru Minallah Dept. Computer Software Engineering Military College of Signals National University of Science and Technology Dept. Computer System Engineering University of Engineering and Technology

ISBN: (纸本)9781467349901

There are diverse factors involved in the transmission of live video over internet. These factors have direct impact on the quality of the transmitted video. The underlying protocol, encapsulation method and the choice of video codec are the, key factors involved in the transmission of video over streaming network. Up to our knowledge various studies have been performed to analyze the impact of these factors individually on the quality of video transmission however their joint impact on video transmission is not yet done. In this paper we characterize the performance of live video streaming setup, while keeping in view the effect of stack-protocol, encapsulation method and the underlying video codec on delay as the key investigating parameter. The results obtained while considering diverse video streaming setups are provided in the results section of this paper. More specifically, it was observed that stack (http, mjpeg, mjpeg) performs best and stack (mms, asf, wmv1) perform worst.

关键词： Stack Protocol Encapsulation Codec VideoLAN Client Video Streaming

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Measurement of Business Rules Specified as Reusable Components: Exploratory Study of Its Impact on the Functional Size of software Projects

Measurement of Business Rules Specified as Reusable Componen...

引用

Joint Conference of the Int'l Workshop on and International Conference on software Process and Product Measurement software Measurement

作者： Sylvie Trudel Alain Abran Computer Science Department Université du Québec à Montréal Montréal Canada Dept. of Software Engineering and Information Technologies École de Technologie Supéricurc Montréal Canada

When reusable software elements are defined in the requirements phase, this raises a number of issues for the measurement of their functional size, when a reusable element implements a business rule or a business sub process, for example. A case study is presented with project functional size measurement data to illustrate the impact of reuse on the resulting size and to determine criteria of reuse effectiveness and efficiency.

关键词： software Size measurement software measurement Organizations Productivity computer architecture

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Identifying Barriers to the Systematic Literature Review Process

Identifying Barriers to the Systematic Literature Review Pro...

引用

International Symposium on Empirical software engineering and Measurement, ESEM

作者： Jeffrey C. Carver Edgar Hassler Elis Hernandes Nicholas A. Kraft Dept. of Computer Science Univ. of Alabama Tuscaloosa AL USA Dept. of Information Systems Statistics and Management Science Univ. of Alabama Tuscaloosa AL USA LaPES - Software Engineering Research Lab Federal Univ. of São Carlos São Carlos SP Brazil

Conducting a systematic literature review (SLR) is difficult and time-consuming for an experienced researcher, and even more so for a novice graduate student. With a better understanding of the most common difficulties in the SLR process, mentors will be better prepared to guide novices through the process. This understanding will help researchers have more realistic expectations of the SLR process and will help mentors guide novices through its planning, execution, and documentation phases. Consequently, the objectives of this work are to identify the most difficult and time-consuming phases of the SLR process. Using data from two sources - 52 responses to an online survey sent to all authors of SLRs published in software engineering venues and qualitative experience reports from 8 PhD students who conducted SLRs as part of a course - we identified specific difficulties related to each phase of the SLR process. Our findings highlight the importance of planning, teamwork, and mentoring by an experienced researcher throughout the process. The paper also identifies implications for the teaching of the SLR process.

关键词： Protocols Data mining Encoding Databases Planning Quality assessment Search problems

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Real-Time Traffic Classification for Unified Communication Networks

Real-Time Traffic Classification for Unified Communication N...

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International Conference on Selected Topics in Mobile and Wireless Networking

作者： Abdelwahab M. Elnaka Qusay H. Mahmoud School of Computer Science University of Guelph Dept. of Electrical Computer and Software Engineering University of Ontario Institute of Technology

ISBN: (纸本)9781479905058

The key feature of Unified Communications (UC) lies in its ability to provide the service that the customer wants, when he wants and regardless of the device being used. At the heart of the UC architecture, which spans different layers from application layer to network, comes the Quality of Service (QoS) framework that is essential to provide adequate service to different communication session's call participates. The heterogeneity of access networks and diversity of a UC session's participants make it necessary to classify incoming traffic based on its type and the QoS requirements of the participating parties. The existence of different traffic classifications for different existing access networks raises the question of how to classify incoming traffic when it belongs to a diverse set of access networks and devices. In this paper, we investigate different classification methods currently adopted in different access networks and industry standards. We introduce a traffic classification method that should satisfy the requirements of real-time traffic that traverses most of the existing access networks. The classification method has been tested using both First In First Out (FIFO) and Weighted Fair Queuing (WFQ) schedulers to evaluate different classes performance in a shared environment with diverse QoS requirements. The results obtained showed the feasibility of our proposed classification.

关键词： UC HSPA DiffServ IntServ QoS

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HARMs: Hierarchical attack representation models for network security analysis 10

HARMs: Hierarchical attack representation models for network...

引用

10th Australian Information Security Management Conference, AISM 2012

作者： Hong, Jin Kim, Dong-Seong Dept. of Computer Science and Software Engineering University of Canterbury Christchurch New Zealand

ISBN: (纸本)9780729807029

Attack models can be used to assess network security. Purely graph based attack representation models (e.g., attack graphs) have a state-space explosion problem. Purely tree-based models (e.g., attack trees) cannot capture the path information explicitly. Moreover, the complex relationship between the host and the vulnerability information in attack models create difficulty in adjusting to changes in the network, which is impractical for modern large and dynamic network systems. To deal with these issues, we propose hierarchical attack representation models (HARMs). The main idea is to use two-layer hierarchy to separate the network topology information (in the upper layer) from the vulnerability information of each host (in the lower layer). We compare the HARMs with existing attack models (including attack graph and attack tree) in model complexity in the phase of construction, evaluation and modification.

关键词： Network security

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Redundant service removal in QoS-aware service composition

Redundant service removal in QoS-aware service composition

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2012 IEEE 19th International Conference on Web Services, ICWS 2012

作者： Chen, Min Yan, Yuhong Dept. of Computer Science and Software Engineering Concordia University Montreal QC Canada

ISBN: (纸本)9780769547527

QoS-aware service composition is the generation of a business process to fulfill functional goals and optimize the QoS criteria at the same time. People may focus on the optimization of a single QoS criterion or a set of QoS criteria. We find that though many composition algorithms can get the optimal QoS values, the solutions obtained can possibly contain redundant services, the removal of which does not worsen the QoS value of the solution. In the literatures using Web Service Challenge (WSC) open data sets, the removable services can be over 30% of the services in the solutions. This common problem has been ignored so far. The fundamental reason is that execution cost is not one of the criteria to optimize. Even in the cases when execution costs are not explicitly given for each service, we are still motivated to reduce the number of services in the final solution by assuming each service takes unit cost. In this paper, we study the redundancy removal problem to further optimize the QoS optimal solutions obtained by QoS-aware service composition algorithms. We model the redundancy removal problem as an integer programming problem. Though solvable using a standard solver, we present an algorithm to solve the problem in this specific context and it proves to have better performance than a standard integer programming solver. We also present the results of our data experiments. © 2012 IEEE.

关键词： Quality of service

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