检索结果-内蒙古大学图书馆

作者： Antonio, Athanasios Chatzigiannakis, Ioannis Kinalis, Athanasios Mylonas, Georgios Nikoletseas, Sotiris Papageorgiou, Apostolos Research Academic Computer Technology Institute Patras Greece Computer Engineering and Informatics Department University of Patras Greece

ISBN: (纸本)9781595938053

In this work we present the basic concepts in the architecture of a peer-to-peer environment for monitoring multiple wireless sensor networks, called ShareSense. ShareSense, which is currently under development, uses JXTA as a peer-to-peer substrate. We demonstrate its basic functionalities using a simple application scenario, which utilizes multiple disparate wireless sensor networks. This application scenario involves monitoring of such networks using a separate management environment and a custom application GUI, as well as using Google Earth as an additional user interface. Copyright 2007 ACM.

关键词： Distributed computer systems

来源：评论

学校读者我要写书评

暂无评论

Enhancing Ns-2 with diffserv QoS features

Enhancing Ns-2 with diffserv QoS features

引用

10th Communications and Networking Simulation Symposium, CNS 2007, Part of the 2007 Spring Simulation Multiconference, SpringSim 2007

作者： Bouras, Ch. Primpas, D. Stamos, K. Research Academic Computer Technology Institute PO Box 1122 Patras Greece Computer Engineering and Informatics Dept. Univ. of Patras GR-26500 Patras Greece

ISBN: (纸本)1565553128

In this paper, we present work that we have carried out in extending the ns-2 simulator in order to study and validate Quality of Service issues and related architectures. In the case of the DiffServ framework, simulation is valuable since an analytical approach of mechanisms and services is infeasible due to the aggregation and multiplexing of flows. This paper covers work in extending ns-2 functionality towards the direction of realistic traffic generation and a series of mechanisms defined by the DiffServ architecture. We have also extended ns-2 with the functionality of Bandwidth Brokers, which are entities for managing the resources and negotiating end to end resource reservations between domains. The Bandwidth Broker ns-2 implementation is useful for studying the related architectures and admission control procedures.

关键词： Quality of service

来源：评论

学校读者我要写书评

暂无评论

Semantic web search for e-government: The case study of intrastat

引用

Journal of Internet technology 2007年第4期8卷 457-468页

作者： Markellos, Konstantinos Sakkopoulos, Evangelos Sirmakessis, Spiros Tsakalidis, Athanasios Research Academic Computer Technology Institute Department of Computer Engineering and Informatics University of Patras Greece Department of Applied Informatics in Administration and Economics Technological Educational Institutional of Messolongi University of Patras Greece Department of Computer Engineering and Informatics University of Patras Greece Department of Applied Informatics in Administration and Economy TEI of Messolongi Data Bases and Information Systems Sector E-business and Human Computer Interaction Lab.

The field of Statistics is a conceptually rich domain where information is complex, huge in volume, and highly valuable and critical for Governmental institutes. The daily production of statistical information increases exponentially worldwide, making the processing of all this information a very difficult and time - consuming task. Therefore, efficient search, filtering and browsing techniques are needed to access and process statistical data in an effective way. We present semantically enhanced search approach to enhance e-Govemment searching services. We evaluate our proposals on the case of Intrastat, that is the method of collecting information and producing statistics on the export and import of goods between Member States of the European Union (EU), providing added - value web search services. We employ Semantic Web technologies to create an intelligent search engine based on modeling the systems' electronic catalogue using the OWL ontology language, combined with AJAX techniques for usability richness and responsiveness. We present a search tool based on these technologies, that consists of a) our novel ontology for the EU Combined Nomenclature codes serving as a knowledge base, b)a semantically enhanced search and recommendation module that improves the quality of the results and c) a "Search as you type" visualization and navigation module to provide a usable interface to be used in navigation and search.

关键词： Semantic Web

来源：评论

学校读者我要写书评

暂无评论

Promo: Novel metrics that combine hits and accessibility criteria in order to promote important content and links 07

Promo: Novel metrics that combine hits and accessibility cri...

引用

2007 Euro American Conference on Telematics and Information Systems, EATIS 2007

作者： Garofalakis, John Giannakou, John Giannakoudi, Theodoula Sakkopoulos, Evangelos Research Academic Computer Technology Institute N. Kazantzaki str. 26500 Greece University of Patras Computer Engineering Informatics Dept 26500 Patras Greece

ISBN: (纸本)9781595935984

In this work, we introduce metrics and a proposed procedure to measure the popularity of a website. We present two novel metrics, Promo and Promo(2) that take advantage of the internal link structure of a website, in order to gain important navigation information. This is indicative of the difficulty the user encounters to access a particular link and can be combined with statistics gained from the log files as a metric of popularity. The two metrics propose a different definition of the popularity of a web object in order to generate a sorted list of promotion values for a website's links. We have delivered a web tool that implements the proposed procedure in order to facilitate a site designer to manipulate his/her web server log data, receive recommendations and popularity results and finally proceed with changes in the structure or position of links. Overall, the experimental study using user-based accesses log data, has been encouraging and it has verified the effectiveness of the Promo metrics.

关键词： Websites

来源：评论

学校读者我要写书评

暂无评论

An efficient mechanism for adaptive multimedia transmission in 3G networks

An efficient mechanism for adaptive multimedia transmission ...

引用

2007 IADIS International Conference on Wireless Applications and Computing, WAC 2007, part of the 1st IADIS Multi Conference on computer Science and Information Systems, MCCSIS 2007

作者： Alexiou, Antonios Barounis, Konstantinos Bouras, Christos Research Academic Computer Technology Institute and Computer Engineering and Informatics University of Patras N. Kazantzaki str. GR Patras26500 Greece

ISBN: (纸本)9789728924409

This paper proposes a mechanism for the congestion control for video transmission over UMTS. Our scheme is applied when the mobile user experiences real time multimedia content and adopts the theory of a widely accepted rate control method in wired networks, namely equation based rate control. In this approach, the transmission rate of the multimedia data is determined as a function of the packet loss rate, the round trip time and the packet size and the server explicitly adjusts its sending rate as a function of these parameters. Through a number of simulations and experiments we validate the correctness and measure the performance and efficiency of the mechanism. The mechanism at first level is evaluated through simulations that carried out in the ns-2 simulator. At second level, in order to validate the proposed mechanism in real world traffic scenarios we perform some experiments in a commercial UMTS network. © 2007 IADIS

关键词： Video streaming

来源：评论

学校读者我要写书评

暂无评论

Challenges in cross layer adaptation for multimedia transmission

Challenges in cross layer adaptation for multimedia transmis...

引用

2007 IADIS International Conference on Telecommunications, Networks and Systems, TNS 2007, part of the 1st IADIS Multi Conference on computer Science and Information Systems, MCCSIS 2007

作者： Bouras, Christos Gkamas, Apostolos Kioumourtzis, Georgios Research Academic Computer Technology Institute Computer Engineering and Informatics Department University of Patras N. University of Patras Kazantzaki Str. Rion 26500 Greece Computer Engineering and Informatics Department University of Patras 26500 Greece

ISBN: (纸本)9789728924409

Over the last years a number of new protocols have been developed for multimedia applications in the whole OSI layer's scale. In order to support better wireless user the cross layer design paradigm has been proposed. This paper presents the challenges in design and implementation of cross layer adaptation schemes for multimedia transmission over wired and wireless networks. In addition, the paper proposes the basic aspects of a cross-layer adaptation framework for multimedia transmission over wired and wireless networks. The main concept is based on a "holistic approach" in which all layers participate to the adaptation process and make its own contributions. Finally, the proposed framework can support both wired and wireless receivers in one platform. © MCCSIS 2007 .All right reserved.

关键词： Wireless networks

来源：评论

学校读者我要写书评

暂无评论

Multicast in UMTS: Adopting TCP-Friendliness

引用

12th IFIP International Conference on Personal Wireless Communications, PWC 2007

作者： Alexiou, Antonios Bouras, Christos Papazois, Andreas Research Academic Computer Technology Institute N. Kazantzaki str. 26500 Patras Greece Computer Engineering and Informatics Department University of Patras 26500 Patras Greece

ISBN: (纸本)9780387741581

In this paper, we present a novel mechanism for the multicast congestion control over UMTS networks. The proposed mechanism is based on the well known TCP-Friendly Multicast Congestion Control (TFMCC) scheme. The key challenge in the design of the new scheme lies in improving the TFMCC mechanism to cope with the packet losses caused by either the temporary or the permanent degradation of the wireless channels. The proposed scheme introduces minor modifications in the UMTS nodes with respect to the computing power of the mobile terminals. Finally, our approach is implemented in the ns-2 network simulator and is evaluated it under various conditions.

关键词： Multicasting

来源：评论

学校读者我要写书评

暂无评论

Construction of the Corpus of Spontaneous Japanese and annotation techniques

引用

Journal of the National institute of Information and Communications technology 2007年第3期54卷 5-14页

作者： Uchimoto, Kiyotaka Isahara, Hitoshi Takanashi, Katsuya Takeuchi, Kazuhiro Nobata, Chikashi Morimoto, Ikuyo Yamada, Atsushi Computational Linguistic Group Knowledge Creating Communication Research Center Academic Center for Computing and Media Studies Kyoto University School of Computer Science University of Manchester Advanced Software Technology and Mechatronics Research Institute of Kyoto Dept. of Engineering Informatics Osaka Elmectro-Communication University School of Low and Politics Kwansei Gakuin University

This paper describes annotations for the Corpus of Spontaneous Japanese. The information we annotated to the corpus includes morphemes, clause units, dependency structures, summaries, and discourse structures. They are integrated in the form of XML. Morphological information was semi-automatically annotated to the transcribed text by reducing the human labor cost within the framework of morphological annotation that we proposed. Next, clause unites were detected based on the morphological information as basic units for our annotation. Then, dependency structures, summaries, discourse structures were annotated based on the clause units.

关键词： Information technology

来源：评论

学校读者我要写书评

暂无评论

MBMS Power Planning in Macro and Micro Cell Environments

MBMS Power Planning in Macro and Micro Cell Environments

引用

IEEE Symposium on computers and Communications (ISCC)

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Evangelos Rekkas Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Greece Research Academic Computer Technology Institute Greece and Computer Engineering and Informatics Department University of Patras Greece

Multimedia Broadcast Multicast Services (MBMS), introduced in Third Generation Partnership Project (3GPP) Release 6, is a point-to-multipoint downlink bearer service that addresses the need for the efficient usage of the expensive radio resources. Power control is one of the most important aspects in MBMS due to the fact that Node B's transmission power is a limited resource and must be shared among all MBMS users in a cell. Consequently, the analysis of transmitted power plays a fundamental role in the planning and optimization process of Universal Mobile Telecommunications System (UMTS) radio access networks. This paper investigates several factors affecting Node B's transmission power levels such as, cell deployment, propagation models, Quality of Service (QoS) requirements, users' distributions and mobility issues. Finally, different transport channels for the transmission of the multicast data over the UTRAN interfaces are considered.

关键词： Quality of service Digital multimedia broadcasting Multimedia communication Radio broadcasting Downlink Power control Power system planning Process planning 3G mobile communication Radio access networks

来源：评论

学校读者我要写书评

暂无评论

Cost Analysis of the MBMS Multicast Mode of UMTS

Cost Analysis of the MBMS Multicast Mode of UMTS

引用

IEEE Symposium on computers and Communications (ISCC)

作者： Antonios Alexiou Christos Bouras Evangelos Rekkas Research Academic Computer Technology Institute Greece and Computer Engineering and Informatics Dept University of Patras Greece

Along with the widespread deployment of the third generation cellular networks, the fast-improving capabilities of the mobile devices, content and service providers are increasingly interested in supporting multicast communications over wireless networks and in particular over universal mobile telecommunications system (UMTS). To this direction, the third generation partnership project (3 GPP) is currently standardizing the multimedia broadcast/multicast service (MBMS) framework of UMTS. In this paper, we present an overview of the MBMS multicast mode of UMTS. We analytically present the multicast mode of the MBMS and analyze its performance in terms of packet delivery cost under various network topologies, cell types and multicast users' distributions. Furthermore, for the evaluation of the scheme, we consider different transport channels for the transmission of the data over the UTRAN interfaces.

关键词： Costs 3G mobile communication Performance analysis Land mobile radio cellular systems Multicast communication Wireless networks DC generators Digital multimedia broadcasting Multimedia communication Network topology

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：