检索结果-内蒙古大学图书馆

IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： C. Bouras K. Stamos Computer Engineering and Informatics Department University of Patras Papas Greece Research Academic Computer Technology Institute Patras Greece

In this paper the issue of the architectural organization of a bandwidth broker with respect to the distribution of functionalities among separate entities is examined. We discuss the benefits of a distributed versus a centralized architecture and study some of the most important implementations. We also present a novel design proposal that builds on our earlier work on the admission control module of a bandwidth broker and introduces it in the framework of a distributed bandwidth broker architecture. Our conclusions are supported by a series of simulated experiments that we analyze.

关键词： Bandwidth Scalability Distributed computing Diffserv networks Admission control computer architecture informatics Electronic mail Proposals Analytical models

来源：评论

学校读者我要写书评

暂无评论

Analyzing traffic across the Greek School Network

Analyzing traffic across the Greek School Network

引用

IEEE Workshop on Local and Metropolitan Area Networks (LANMAN)

作者： C. Kattirtzis E. Varvarigos K. Vlachos G. Stathakopoulos M. Paraskevas Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In this paper, we present a comprehensive traffic analysis of the Greek School Network (GSN), a wide area network designed to provide Internet access and services to about 15,000 units of primary and secondary education schools and administration offices. In our analysis, we have used measurements from the PATRAS region node obtained through the Cisco NetFlow and FlowScan tools. We have used classical analysis to obtain protocol and application traffic statistics. Our study revealed that TCP traffic is dominant in the network, while nearly 50% of the outgoing and 37% of the incoming traffic is peer-to-peer (P2P) traffic, with a further 25.6% of traffic using not registered ports and suspected to be P2P as well. Finally, we have also observed a remarkable traffic locality phenomenon in the P2P services, where more than the 90% of the traffic was heading or generated by 50 hosts

关键词： Telecommunication traffic Traffic control Peer to peer computing Wide area networks Educational institutions Access protocols Statistics IP networks Web and internet services Statistical analysis

来源：评论

学校读者我要写书评

暂无评论

Energy-aware routing in wireless ad-hoc networks

Energy-aware routing in wireless ad-hoc networks

引用

IEEE International Symposium on World of Wireless Mobile and Multimedia Networks (WoWMoM)

作者： P.C. Kokkinos C.A. Papageorgiou E.A. Varvarigos Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

We study energy efficient routing strategies for wireless ad-hoc networks. In this kind of network, energy is a scarce resource and its conservation and efficient use is a major issue. Our strategy follows the multi-cost routing approach, according to which a cost vector of various parameters is assigned to each link. The parameters of interest are the number of hops on a path, and the residual energy and transmission power of the nodes on the path. These parameters are combined in various optimization functions, corresponding to different routing algorithms, for selecting the optimal path. We evaluate the routing algorithms proposed in a number of scenarios, with respect to energy consumption, throughput and other performance parameters of interest. From the experiments conducted, we conclude that routing algorithms that take into account energy related parameters, increase the lifetime of the network, while achieving better performance than other approaches, such as minimum hop routing.

关键词： Intelligent networks Ad hoc networks Costs Energy efficiency Energy consumption Routing protocols Throughput Mobile ad hoc networks Batteries Power engineering and energy

来源：评论

学校读者我要写书评

暂无评论

Motif extraction from biological sequences: trends and contributions to other scientific fields

Motif extraction from biological sequences: trends and contr...

引用

International Conference on Information technology and Applications, ICITA

作者： K. Perdikuri A. Tsakalidis Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In this paper we present algorithms for the localization and extraction of interesting motifs from biological sequences. We are especially interested in weighted sequences, which are extensively used in molecular biology as profiles for protein families and for the representation of binding sites. It is our belief that these algorithms can also be applied to other information technology applications such as network management, data mining and signal processing.

关键词： Sequences Biological information theory Proteins Signal processing algorithms Data mining DNA Biology computing Information technology RNA Biological system modeling

来源：评论

学校读者我要写书评

暂无评论

Implementation issues of managed bandwidth service: the case of GRNET

Implementation issues of managed bandwidth service: the case...

引用

Proceedings of the Systems Communications, SENET

作者： C. Bouras P. Dimitris Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

This paper describes the design and the implementation of the managed bandwidth service (MBS) in a high speed backbone network as well as a management tool for the service. The service was designed taking advantage of features provided by the MPLS technology and also using the DiffServ architecture. So, it uses L2 MPLS VPNs to provide point to point connection and also marks the traffic in order to pass from certain priority queues (to provide guaranteed bandwidth). It also enables traffic engineering characteristics in order to provide load balancing on the network as well as fast rerouting in case of link failure. In addition we implemented a management tool for the service. The scope of this tool is to allow the users to manage their MBS requests (make a new one, edit, delete or view a request). Also the tool performs admission control and produces the necessary configuration that must be applied on the network in order to implement every service's request. This service was designed and implemented on GRNET's network.

关键词： Bandwidth computer aided software engineering technology management Spine Multiprotocol label switching computer networks computer network management engineering management Diffserv networks Telecommunication traffic

来源：评论

学校读者我要写书评

暂无评论

Personalized e-commerce recommendations

Personalized e-commerce recommendations

引用

IEEE International Conference on e-Business engineering (ICEBE)

作者： P. Markellou I. Mousourouli S. Sirmakessis A. Tsakalidis Department of Computer Engineering & Informatics University of Patras Patras Germany Research Academic Computer Technology Institute Patras Greece

Recommendation systems are special personalization tools that help users to find interesting information and services in complex online shops. Even though today's e-commerce environments have drastically evolved and now incorporate techniques from other domains and application areas such as Web mining, semantics, artificial intelligence, user modeling and profiling, etc. setting up a successful recommendation system is not a trivial or straightforward task. This paper argues that by monitoring, analyzing and understanding the behavior of customers, their demographics, opinions, preferences and history, as well as taking into consideration the specific e-shop ontology and by applying Web mining techniques, the effectiveness of produced recommendations can be significantly improved. In this way, the e-shop may upgrade users' interaction, increase its usability, convert users to buyers, retain current customers and establish long-term and loyal one-to-one relationships

关键词： Business Internet Educational technology informatics Environmental economics Web mining Navigation computer science education Systems engineering education Artificial intelligence

来源：评论

学校读者我要写书评

暂无评论

Retaining female and minority students with EMC2scholars program

Retaining female and minority students with EMC2scholars pro...

引用

2005 ASEE Annual Conference and Exposition: The Changing Landscape of engineering and technology Education in a Global World

作者： Gupta, Surendra K. Hensel, Edward C. Savakis, Andreas Tymann, Paul Narayan, Darren Rochester Institute of Technology Rochester NY United States Department of Mechanical Engineering and Materials Science and Engineering United States Department of Mechanical Engineering Department of Computer Engineering Department of Computer Science Undergraduate Research in Mathematics

This paper details our highly successful scholarship and academic support program to retain and graduate students in four academic departments: Mechanical engineering, Mathematics, computer engineering and computer Science (EMC2). The EMC2Scholars Program is supported by a 4-year grant from the National Science Foundation's CSEMS Program and matching funds from the Rochester institute of technology. The paper describes the processes for selection of scholars and renewal of scholarship, and includes data on departmental distribution, student demographics and retention. It describes programmatic elements that worked or did not work in retaining students in CSEMS degree programs. Successful EMC2program elements may be deployed elsewhere to retain female and minority students.

关键词： Education

来源：评论

学校读者我要写书评

暂无评论

Combining expert systems and adaptive hypermedia technologies in a Web based educational system

Combining expert systems and adaptive hypermedia technologie...

引用

International Conference on Advanced Learning Technologies (ICALT)

作者： I. Hatzilygeroudis C. Giannoulis C. Koutsojannis Dept of Computer Engineering & Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In this paper, we present a Web-based intelligent education system to help students in the context of an AI course. We concentrate on the adaptivity and student evaluation aspects of the system. Adaptivity refers to the capability of the system to adapt teaching to student needs, specified by the student model characteristics. Student evaluation refers to the evaluation of the knowledge level of a student, which is one of the most important characteristics, with regards to taught concepts. Adaptive hypermedia techniques, like graphical link annotation, and an intelligent technique, i.e. a rule-based expert system, are used to achieve the above goals. An evaluation of the system showed encouraging results as far as its usability and learning are concerned.

关键词： Expert systems Adaptive systems Educational technology Artificial intelligence Intelligent systems Education Delta modulation World Wide Web Navigation Samarium

来源：评论

学校读者我要写书评

暂无评论

Capturing application-domain specific patterns in a Web application: The e-learning paradigm

Capturing application-domain specific patterns in a Web appl...

引用

4th IASTED International Conference on Web-Based Education, WBE 2005

作者： Dimitrakopoulou, Dimitra Rigou, Maria Sirmakessis, Spiros Tsakalidis, Athanasios Tzimas, Giannis Research Academic Computer Technology Institute Internet and Multimedia Technologies Research Unit 61 Riga Feraiou str. GR-262 21 Patras Hellas Greece University of Patras Computer Engineering and Informatics Department GR-26504 Rio-Patras Hellas Greece Technological Educational Institution of Messolongi Nea Ktiria GR-30200 Messolongi Hellas Greece

ISBN: (纸本)0889864802

Designing and maintaining Web applications is one of the major challenges that software industry has to face. Several modeling techniques have been proposed to support this process. In this work we present a methodology for identifying design patterns within an application modelled using WebML, a modelling language for designing data-intensive Web applications. We extend the set of design patterns supported by WebML and exemplify the application of the methodology using an e-learning scenario.

关键词： E-learning

来源：评论

学校读者我要写书评

暂无评论

MAX-MIN FAIR FLOW CONTROL SENSITIVE TO PRIORITIES

引用

Journal of Interconnection Networks 2005年第2期6卷 85-114页

作者： PANAGIOTA FATOUROU MARIOS MAVRONICOLAS PAUL SPIRAKIS Department of Computer Science University of Ioannina Ioannina GR-45110 Greece Department of Computer Science University of Cyprus Nicosia CY-1678 Cyprus Department of Computer Engineering and Informatics University of Patras Patras GR-26500 Greece Research and Academic Computer Technology Institute Patras GR-26110 Greece

Flow control is the dominant technique currently used in communication networks for preventing excess traffic from flooding the network, and for handling congestion. In rate-based flow control, transmission rates of sessions are adjusted in an end-to-end manner through a sequence of operations . In this work, we present a theory of max-min fair , rate-based flow control sensitive to priorities of different sessions, as a significant extension of the classical theory of max-min fair, rate-based flow control to networks supporting applications with diverse requirements on network resources. Each individual session bears a priority function , which maps the session's priority to a transmission rate; the priority is a working abstraction of the session's priority to bandwidth access. Priority functions enable the specification of requirements on bandwidth access by distributed applications, and the formal handling of such requirements. We present priority max-min fairness , as a novel and well motivated fairness condition which requires that assigned rates correspond, through the priority functions, to priorities comprising a max-min vector. We also introduce priority bottleneck algorithms gradually update a session's rate until when its priority is restricted on a priority bottleneck edge of the network. We establish a collection of interesting combinatorial properties of priority bottleneck algorithms. Most significantly, we show that they can only converge to priority max-min fairness. As an application of our general theory, we embed priority bottleneck algorithms in the more realistic optimistic framework for rate-based flow control. The optimistic framework allows for both decreases and increases of session rates. We exploit these additionally provided semantics to prove further combinatorial properties for the termination of priority bottleneck algorithms in the optimistic framework. We use these properties to conclude the first optimistic algorithms for efficien

关键词： Flow control Max-min fairness Priority max-min fairness Priority bottleneck algorithms Convergence complexity

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：