检索结果-内蒙古大学图书馆

Simulation of Agilla middleware on TOSSIM 1

Simulation of Agilla middleware on TOSSIM

1st International ICST Conference on Simulation Tools and Techniques for Communications, Networks and Systems, SIMUTools 2008

作者： Özarslan, S. Erten, Y.M. Informatics Institute Middle East Technical University Ankara06531 Turkey Computer Engineering Department University of Economics and Technology Ankara06560 Turkey

ISBN: (纸本)9789639799233

In this study, we performed a simulation of mobile agents running on Agilla middleware designed for sensor networks. The simulations are performed using TOSSIM assuming that Agilla middleware is installed on the sensor nodes which are running TinyOS operating system. We simulated different agents corresponding to various functions and measured the time it takes for these agent software to run in the simulated environment and compared these results with those obtained using actual sensor nodes. The results presented in the study show that simulations produce results comparable to real life experiments. Copyright © 2008 ICST.

关键词： Mobile agents

来源：评论

学校读者我要写书评

暂无评论

Hardware principles for the design of a stereo-matching state machine based on dynamic programming

引用

Journal of engineering Science and technology Review 2008年第1期1卷 19-24页

作者： Kalomiros, J.A. Lygouras, J. Department of Informatics and Communications School of Technological Applications Serres Institute of Education and Technology Terma Magnisias 62100 Serres Greece Section of Electronics and Information Systems Technology Department of Electrical Eng. and Computer Eng. School of Engineering Democritus University of Thrace Xanthi Greece

This paper presents basic design principles for hardware implementation of a two-pass stereo-matching algorithm based on dynamic programming. For the first-pass a state-machine is proposed for the recursive calculation of the cost-function. The state-machine works along the diagonal of a 2-D disparity space for each epipolar pair of image scan-lines. On-chip local raM stores tags that denote the minimum transition cost to every point in the disparity space among possible costs from all three neighboring points. All calculations are within a pre-determined useful disparity range. For the second pass, hardware rules are presented that produce the correct disparity per pixel, by backtracking stored cost values. Hardware stages are structured along a fully parallel pipeline, that outputs disparities in step with the input serial pixel stream at clock rate. © 2008 Kavala institute of technology.

关键词： Dynamic programming

来源：评论

学校读者我要写书评

暂无评论

Extending the functionality of RTP/RTCP implementation in network simulator (NS-2) to support TCP friendly congestion control 1

Extending the functionality of RTP/RTCP implementation in ne...

引用

1st International ICST Conference on Simulation Tools and Techniques for Communications, Networks and Systems, SIMUTools 2008

作者： Bouras, Christos Gkamas, Apostolos Kioumourtzis, Georgios Research Academic Computer Technology Institute University of Patras N. Kazantzaki Str. Rion26500 Greece University of Patras Department of Computer Engineering and Informatics Rion Patras26500 Greece

ISBN: (纸本)9789639799233

In this paper, we present a modification of the ns2 code for the RTP/RTCP protocols. The legacy RTP/RTCP code in ns2 has not yet been validated but it provides a framework of the protocol's specification for experimental use. We have modified the code by adding all the RTP/RTCP protocol's attributes that are defined in RFC 3550 and related to QoS metrics. We have also implemented additional algorithms and functions in order to enhance our modified code with TCP friendly bandwidth share behavior. Our protocol, named RTPUP ("UP" stands for the University of Patras), is offered as a package and is fully documented so that it can be used for simulations and research within the ns2 simulation environment. Copyright © 2008 ICST.

关键词： Transmission control protocol

来源：评论

学校读者我要写书评

暂无评论

Robust line planning under unknown incentives and elasticity of frequencies

Robust line planning under unknown incentives and elasticity...

引用

8th Workshop on Algorithmic Approaches for Transportation Modeling, Optimization, and Systems, ATMOS 2008

作者： Kontogiannis, Spyros Zaroliagis, Christos R.A. Computer Technology Institute Patras University Campus N. Kazantzaki Str. 26500 Patras Greece Computer Science Department University of Ioannina Ioannina Greece Department of Computer Engineering and Informatics University of Patras 26500 Patras Greece

ISBN: (纸本)9783939897071

The problem of robust line planning requests for a set of origin-destination paths (lines) along with their traffic rates (frequencies) in an underlying railway network infrastructure, which are robust to fluctuations of real-time parameters of the solution. In this work, we investigate a variant of robust line planning stemming from recent regulations in the railway sector that introduce competition and free railway markets, and set up a new application scenario: there is a (potentially large) number of line operators that have their lines fixed and operate as competing entities struggling to exploit the underlying network infrastructure via frequency requests, while the management of the infrastructure itself remains the responsibility of a single (typically governmental) entity, the network operator. The line operators are typically unwilling to reveal their true incentives. Nevertheless, the network operator would like to ensure a fair (or, socially optimal) usage of the infrastructure, e.g., by maximizing the (unknown to him) aggregate incentives of the line operators. We show that this can be accomplished in certain situations via a (possibly anonymous) incentive-compatible pricing scheme for the usage of the shared resources, that is robust against the unknown incentives and the changes in the demands of the entities. This brings up a new notion of robustness, which we call incentive-compatible robustness, that considers as robustness of the system its tolerance to the entities' unknown incentives and elasticity of demands, aiming at an eventual stabilization to an equilibrium point that is as close as possible to the social optimum.

关键词： Elasticity

来源：评论

学校读者我要写书评

暂无评论

TraILS, a Toolkit for Efficient, Realistic and Evolving Models of Mobility, Faults and Obstacles in Wireless Networks

TRAILS, a Toolkit for Efficient, Realistic and Evolving Mode...

引用

Annual Symposium on Simulation

作者： Ioannis Chatzigiannakis Athanasios Kinalis Georgios Mylonas Sotiris Nikoletseas Grigoris Prasinos Christos Zaroliagis Computer Technology Institute (CTI) Department of Computer Engineering and Informatics University of Patras Patras Greece

We present a new simulation toolkit called TraILS (Toolkit for Realism and Adaptivity In Large-scale Simulations), which extends the ns-2 simulator by adding important functionality and optimizing certain critical simulator operations. The added features provide the tools to study wireless networks of high dynamics. TraILS facilitates the implementation of advanced mobility patterns, obstacle presence and disaster scenarios, and failures injection that can dynamically change throughout the execution of the simulation. Moreover, we define a set of utilities that enhance the use of ns-2. This functionality is implemented in a simple and flexible architecture, that follows design patterns, object oriented and generic programming principles, maintaining a proper balance between reusability, extendability and ease of use. We evaluate the performance of TraILS and show that it offers significant speed-ups regarding the execution time of ns-2 in certain important, common wireless settings. Our results also show that this is achieved with minimum overhead in terms of memory usage.

关键词： Wireless networks Object oriented modeling Computational modeling Wireless sensor networks Statistics Contracts Protocols Large-scale systems Mobile ad hoc networks computer simulation

来源：评论

学校读者我要写书评

暂无评论

Design space exploration for a coarse grain accelerator

Design space exploration for a coarse grain accelerator

引用

2008 Asia and South Pacific Design Automation Conference, ASP-DAC

作者： Mehdipour, Farhad Noori, Hamid Zamani, Morteza Saheb Inoue, Koji Murakami, Kazuaki Research Institute for Information Technology Computing and Communication Center Kyushu University Fukuoka Japan Department of Informatics Graduate School of Information Science and Electrical Engineering Kyushu University Fukuoka Japan Department of IT and Computer Engineering Amirkabir University of Technology Tehran Iran

ISBN: (纸本)9781424419227

In the design process of a reconfigurable accelerator employing in an embedded system, multitude parameters may result in remarkable complexity and a large design space. Design space exploration as an alternative to the quantitative approach can be employed to find a right balance between the different design parameters. In this paper, a hybrid approach is introduced to analytically explore the design space for a coarse grain accelerator and determine a wise design point exploiting data extracted from applications, quantitatively. It also provides flexibility for taking into account new design constraints as well as new characteristics of applications. Furthermore, this approach is a methodological approach which reduces the design time and results in a point which satisfies the design goals. ©2008 IEEE.

关键词： Design

来源：评论

学校读者我要写书评

暂无评论

Evaluating a Mobile Emergency Response System

Evaluating a Mobile Emergency Response System

引用

14th International Workshop of Groupware

作者： Sapateiro, Claudio Antunes, Pedro Zurita, Gustavo Vogt, Rodrigo Baloian, Nelson Systems and Informatics Department Superior School of Technology Polytechnic Institute of Setúbal Portugal Department of Informatics Faculty of Sciences University of Lisbon Portugal Management Control and Information Systems Department Business School Universidad de Chile Chile Computer Science Department Engineering School Universidad de Chile Chile

ISBN: (纸本)9783540928300

Existing information systems often lack support to crisis and emergency situations. In such scenarios, the involved actors often engage in ad hoc collaborations necessary to understand and respond to the emerging events. We propose a collaboration model and a prototype aiming to improve the consistency and effectiveness of emergent work activities. Our approach defends the requirement to construct shared situation awareness (SA). To support SA, we developed a collaborative artifact named situation matrixes (SM), which relates different situation dimensions (SD) of the crisis/emergency scenario. A method was also developed to construct and evaluate concrete SM and SD. This method was applied in two organizations' IT service desk teams, which often have to deal with emergency situations. The target organizations found our approach very relevant in organizing their response to emergencies.

关键词： Emergency services

来源：评论

学校读者我要写书评

暂无评论

Efficient delivery of MBMS multicast traffic over HSDPA

Efficient delivery of MBMS multicast traffic over HSDPA

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 Department University of Patras Greece

Multimedia Broadcast/Multicast Service (MBMS) and High-Speed Downlink Packet Access (HSDPA) are two key technologies that constitute a significant step towards the Mobile Broadband. MBMS was introduced by the third Generation Partnership Project (3GPP) in order to support broadcast and multicast communication over wireless networks and in particular over Universal Mobile Telecommunications System (UMTS). Concurrently, HSDPA aims to ensure the transmission of high peak data rates and increase system capacity. In this paper we evaluate the performance of MBMS multicast transmission over the premier transport channel used in HSDPA, named High Speed-Downlink Shared Channel (HS-DSCH). Due to the fact that downlink transmission power is the scarcest resource in UMTS networks, the evaluation is performed through an analytical dimensioning of the MBMS downlink transmission power. Furthermore, the impacts of power allocation on MBMS capacity are investigated.

关键词： Interference Downlink Multiaccess communication Signal to noise ratio Spread spectrum communication 3G mobile communication Throughput

来源：评论

学校读者我要写书评

暂无评论

Emulating lossless, one-way signaling protocols in OBS networks with traffic prediction

Emulating lossless, one-way signaling protocols in OBS netwo...

引用

International Conference on Optical Network Design and Modeling, ONDM

作者： Demetris Monoyios Kyriakos Vlachos Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece

In this paper, we propose a new scheme for on demand reservation of capacity in OBS networks, emulating one-way signaling protocols. The proposed framework relies on the combination of a two-way reservation protocol and a burst assembly scheme with a burstification delay enforced to be the round-trip-time and which incorporates a Least Mean Square filter to predict burst length. Upon the arrival of the first packet in the burst queue, a control packet (setup message) is generated and transmitted to reserve resources, based on the prediction filter. In this way the reservation process starts/ends simultaneously with the burst assembly process. In this paper, we present the main features of the proposed scheme, evaluate its performance for both homogeneous and non-homogeneous traffic and we further propose an extension with aggressive over-provisioning of resources that can guarantee lossless operation even for extremely cases of bursty traffic.

关键词： Protocols Telecommunication traffic Assembly Optical losses Traffic control Optical buffering Filters computer networks Delay Switches

来源：评论

学校读者我要写书评

暂无评论

Power saving methods for MBMS transmissions in UTraN

Power saving methods for MBMS transmissions in UTRAN

引用

IEEE Symposium on computers and Communications (ISCC)

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

The demand for wireless multimedia communications thrives in todaypsilas consumer and corporate market. The need to evolve multimedia applications and services is at a critical point given the proliferation and integration of wireless systems. multimedia broadcast multicast services (MBMS) was introduced in third generation partnership project (3GPP) Release 6 in order to more efficiently use network and radio resources for the transmission of multimedia data, both in the core network and most importantly in the air interface of UTraN (UMTS terrestrial radio access network). However, several obstacles, regarding the high power requirements, should be overcome for the realization of MBMS. The fact that Node Bpsilas transmission power is a limited resource and must be shared among all MBMS users in a cell indicates the need for power control during MBMS transmissions. Several techniques, such as dynamic power setting and macro diversity combining, have been proposed in order to reduce the power requirements of delivering multicast traffic to MBMS users. This paper examines the efficiency of the utilization of these power saving techniques, by presenting simulation results that will reveal the amount of power that is saved.

关键词： Diversity reception Gain Switches Power demand Propagation losses 3G mobile communication Downlink

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：