检索结果-内蒙古大学图书馆

IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, DySPAN

作者： Martin B. H. Weiss Simon Delaere William H. Lehr Telecommunications Program School of Information Sciences University of Pittsburgh Pittsburgh PA USA Vrije Universiteit Brussel Belgium Laboratory for Computer Science Massachusetts Institute of Technology USA

The cognitive radio literature generally assumes that the functions required for non-cooperative secondary DSA are integrated into a single radio system. It need not be so. In this paper, we model cognitive radio functions as a value chain and explore the implications of different forms of organization of this value chain. We initially explore the consequences of separating the sensing function from other cognitive radio functions.

关键词： Chromium Cognitive radio Commercialization Communications Society Power generation economics Economic forecasting Costs TV Time division multiple access Frequency synchronization

来源：评论

学校读者我要写书评

暂无评论

A parallel architecture for Ray-Tracing

A parallel architecture for Ray-Tracing

引用

IEEE Latin American Symposium on Circuits and Systems (LASCAS)

作者： Alexandre S. Nery Nadia Nedjah Felipe M.G. França LAM - Computer Architecture and Microeletronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Department of Electronics Engineering and Telecommunications Universidade do Estado do Rio de Janeiro

Real time rendering of three-dimensional scenes in high photorealistic detail is a hard task, such as in the Ray Tracing rendering algorithm. However, parallel implementations of Ray Tracing have been enabling real time performance, as the algorithm is embarrassingly parallel. Thus, a custom parallel design in hardware is likely to achieve an acceptable performance. In this paper, we propose a hardware parallel architecture capable of dealing with the main desirable features of Ray Tracing, such as shadows and reflection effects, imposing low area cost and acceptable rendering performance.

关键词： computer architecture Interrupters computers Light sources Process control Real-time systems telecommunications

来源：评论

学校读者我要写书评

暂无评论

Enhancements to a retention program for women engineering technology students by the addition of a social support network and community building activities

Enhancements to a retention program for women engineering te...

引用

2009 ASEE Annual Conference and Exposition

作者： Dell, Elizabeth Christman, Jeanne Wolcott, Teresa Valentine, Maureen Department of Manufacturing and Mechanical Engineering Technology Rochester Institute of Technology United States Department of Electrical Computer and Telecommunications Engineering Technology Rochester Institute of Technology United States Department of Computer Engineering Technology Program WIT in the Civil Engineering Technology program RIT South Africa College of Applied Science and Technology Rochester Institute of Technology United States

This paper describes a low-cost, successful program to help retain female Engineering Technology students with the ultimate goal of increasing the number of female graduates of our Engineering Technology programs. This program was started in 2003. The programming initially focused on academic support in the form of tutoring, formation of study groups and reimbursement for academic laboratory kits. This program did improve retention, but a survey of our students found that they also desired social support and opportunities to serve the community. Since the addition of programming involving social support and community building, retention of women students in the Engineering Technology programs has improved by an average of 6% per year. In addition to improved retention, the number of students receiving a D, F or Withdrawing from the core first- and second-year courses in these programs has dropped by over 75%. © American Society for Engineering Education, 2009.

关键词： Students

来源：评论

学校读者我要写书评

暂无评论

A massively parallel hardware architecture for ray-tracing

引用

International Journal of High Performance Systems Architecture 2009年第1期2卷 26-34页

作者： Nery, A.S. Nedjah, N. França, F.M.G. Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE P.O. Box 68511 21941-972 Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering Universidade do Estado do Rio de Janeiro Rua Sao Francisco Xavier 524 Sala 5145-F Maracana 20.550-900 Rio de Janeiro RJ Brazil Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering State University of Rio de Janeiro Brazil Brazil

Real time performance of non-interactive rendering of three-dimensional scenes is usually unachievable. Ray tracing is one of the methods used for rendering such scenes. The performance achieved by a sequential software-based implementation of ray tracing is far from satisfactory. In contrast, many parallel implementations of ray tracing have been enabling real time performance, as the underlying algorithm can be massively parallelised. Thus, it is expected that a custom parallel design in hardware is likely to achieve the acceptable performance standards. In this paper, we propose a hardware architecture, which we call GridRT, capable of dealing with the main desirable features of ray tracing, such as shadows and reflections effects, imposing low requirements in terms of silicon area while achieving acceptable performance in terms of rendering time. This architecture achieves is efficient yet compact as it explores the massive parallelism offered by the intrinsic structure of the algorithm. The design exploits the usage the spatial data structure of regular grids. Copyright © 2009 Inderscience Enterprises Ltd.

关键词： Ray tracing

来源：评论

学校读者我要写书评

暂无评论

GridRT: A Massively Parallel Architecture for Ray-Tracing Using Uniform Grids

GridRT: A Massively Parallel Architecture for Ray-Tracing Us...

引用

Euromicro Symposium on Digital System Design

作者： Alexandre Solon Nery Nadia Nedjah Felipe Maia Galvão Franca Systems Engineering and Computer Science Program Universidade Federal do Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Universidade do Estado do Rio de Janeiro Brazil

In this paper, we propose an architecture, which we call GridRT, capable of dealing with the main features, such as shadows and reflections effects, of Ray Tracing used for rendering three-dimensional scenes. This architecture achieves an efficient overall performance yet using a simple and compact massively parallel design. The design exploits the usage of Xilinx ® Floating Point Operator IP Core and the spatial data structure of Regular Grids.

关键词： Parallel architectures Ray tracing Layout computer architecture Rendering (computer graphics) Optical reflection Data structures computer graphics Pipelines Pixel

来源：评论

学校读者我要写书评

暂无评论

High-performance TCAM-based IP lookup engines

High-performance TCAM-based IP lookup engines

引用

2008 IEEE INFOCOM Workshops

作者： Yu, Hui Chen, Jing Wang, Jianping Zheng, S.Q. Computer Engineering Program University of Texas at Dallas Richardson TX 75083 United States Telecommunications Engineering Program University of Texas at Dallas Richardson TX 75083 United States Department of Computer Science City University of Hong Kong Hong Kong Hong Kong Department of Computer Science University of Texas at Dallas Richardson TX 75083 United States

ISBN: (纸本)9781424422197

IP lookup is a key packet processing task in IP routers. To achieve high performance, it has been proposed to use TCAMs to implement IP-lookup accelerators. In this paper, in addition to the state-of-art MSMB-LPT scheme for TCAM-based IP lookup, M-MSMB-LPT and MSMB-LPT-I schemes are proposed and studied. Using realistic Internet packet traces, it is shown that MSMB-LPT, M-MSMB-LPT and MSMB-LPT-I schemes with different parameters constitute a solution space for constructing a wide-range of high-performance TCAM-based IP lookup engines. Under cost, performance and scalability constraints best IP lookup engine can be selected from this solution space. ©2008 IEEE.

关键词： Routers

来源：评论

学校读者我要写书评

暂无评论

Increasing DHT Data Security by Scattering Data (Invited Paper)

Increasing DHT Data Security by Scattering Data (Invited Pap...

引用

International Conference on computer Communications and Networks (ICCCN)

作者： Bryan Mills Taieb Znati Department of Computer Science Telecommunications Program University of Pittsburgh Pittsburgh PA USA Telecommunications Program University of Pittsburgh Pittsburgh PA USA

ISBN: (纸本)9781424423897

This paper describes methods for increasing the security of data being stored in a distributed hash table (DHT) which leverages the inherent properties of the DHT to provide a secure storage substrate. The methods presented are based upon a framework referred to as "scatter, conceal, and recover" (SCAR). The standard method of securing data in a DHT is to encrypt the data using symmetrical encryption before storing it in the network. SCAR provides this level of security, but also prevents any known cryptoanalisys from being performed. It does this by dividing data into multiple blocks and scattering these blocks within the DHT. The security of SCAR is provided by the property that an attacker is unable to obtain and reassemble the data blocks correctly. However, if the attacker has access to the network communication, the likelihood of a successful attack is significantly increased. This paper defines how such attacks can be executed and provides methods for ensuring data security in spite of such attacks.

关键词： Data security Scattering Secure storage Cryptography Peer to peer computing Memory Telecommunication traffic Milling machines computer science Fires

来源：评论

学校读者我要写书评

暂无评论

SCAR - Scattering, Concealing and Recovering Data within a DHT

SCAR - Scattering, Concealing and Recovering Data within a D...

引用

Annual Symposium on Simulation

作者： Bryan N. Mills Taieb F. Znati Department of Computer Science University of Pittsburgh Pittsburgh PA USA Telecommunications Program University of Pittsburgh Pittsburgh PA USA

This paper describes a secure and reliable method for storing data in a distributed hash table (DHT) leveraging the inherent properties of the DHT to provide a secure storage substrate. The framework presented is referred to as ";Scatter, Conceal, and Recover"; (SCAR). The standard method of securing data in a DHT is to encrypt the data using symmetrical encryption before storing it in the network. SCAR provides this level of security, but also prevents any known cryptoanalysis from being performed. It does this by breaking the data into smaller blocks and scattering these blocks throughout the DHT. Hence, SCAR prevents any unauthorized user from obtaining the entire encrypted data block. SCAR uses hash chains to determine the storage locations for these blocks within the DHT. To ensure storage availability, SCAR uses an erasure coding scheme to provide full data recovery given only partial block recovery. This paper first presents the SCAR framework and its associated protocols and mechanisms. The paper then discusses a prototype implementation of SCAR, and presents a simulation-based experimental study. The results show that in order for the erasure coding techniques used by SCAR to be effective, P2P nodes must sufficiently available.

关键词： Scattering Cryptography Availability Secure storage Data privacy Computational modeling Data security Peer to peer computing computer simulation Milling machines

来源：评论

学校读者我要写书评

暂无评论

Achieving compelling student comprehension of complex information structures for both on-site and on-line courses

Achieving compelling student comprehension of complex inform...

引用

2008 ASEE Annual Conference and Exposition

作者： Uhlig, Ronald Farahani, Alireza Viswanathan, Shekar Evans, Howard Sotelo, Mark National University Department of Computer Science and Information Systems School of Engineering and Technology National University Wireless Communications for the Master ot Science in Wireless Communications Program International Telecommunications Academy School of Engineering and Technology Department of Applied Engineering Lead Faculty for Engineering Management and Homeland Security and Safety Engineering Academic Computing for National University

Teaching engineering and technology subjects involves conveying understanding of abstract information structures and processes such as complex telecommunications protocols, complex mathematical concepts, and data structures. These are multidimensional and can be difficult to grasp quickly. Supported by a Hewlett-Packard (HP) Technology for Teaching grant, the School of Engineering and Technology at National University has embarked on a project to enable students to grasp these complex concepts more quickly and easily, using continuous dialog among students and instructors as the structures are first introduced and then examined from multiple perspectives through real-time interaction among students, small groups, and instructors. HP Wireless Tablet PCs are used to discuss and experiment with diagrams and processes in realtime. This allows combining lectures and problem-solving sessions into a single class session. Our hypothesis is that: 1) an in-depth learning of theory is accomplished, and 2) student engagement is enhanced. Presentation of theory by the instructor is integrated with application while the theory is still in the student's short-term memory. Students no longer have to wait for a separate session such as a recitation session to apply the concepts. This approach often takes less time. In addition to accelerating the learning process, expert instructors find this approach more rewarding as students grasp new concepts more quickly. Analysis of data captured from both students and instructors are presented to support our hypotheses, and our results are compared with similar research carried out by other universities. In addition, the level of interaction enabled by the use of HP Tablets in on-line classes is discussed. The best teaching tools available in existing on-line teaching platforms are compared with the additional tools available in on-site courses when every student has a wireless Tablet PC and specific recommendations are made to on-line teachi

关键词： Students

来源：评论

学校读者我要写书评

暂无评论

Maximizing Throughput of an Optical Opportunistic Hyperchannel Subject to QoS Constraint

Maximizing Throughput of an Optical Opportunistic Hyperchann...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global telecommunications Conference

作者： Jing Chen Jianping Wang Hui Yu S. Q. Zheng Program of Telecommunications Engineering University of Texas Dallas Richardson TX USA Department of Computer Science City University of Hong Kong Hong Kong China Computer Engineering Program University of Texas Dallas Richardson TX USA

Opportunistic hyperchannel was proposed as an improvement of light-trail to carry IP traffic over wavelength division multiplexing (WDM) optical networks given its capability of enabling high speed provisioning and accommodating multi- granularity traffic. In an opportunistic hyperchannel, the optical shutters at the start node and the end node are configured to be in OFF state and the optical shutters at the intermediate nodes can be self-adjusted to be in ON/OFF according to actual traffic. With this ability, an opportunistic hyperchannel can be dynamically divided into multiple segments, and each segment can independently accommodate a request. Thus, an opportunistic hyperchannel can amplify the system throughput. In this paper, we present a centralized dynamic scheduling protocol named prioritized maximum independent set (PMIS), and introduce a data structure called 2-dimensional priority search tree (2D-PST) that supports PMIS. With 2D-PST, one round of PMIS can be carried out in O(k . log n . log m) time to maximize the system throughput under the constraint of assuring quality of service (QoS) for opportunistic hyperchannels. The simulation results quantitatively demonstrate the effectiveness of PMIS protocol.

关键词： Throughput High speed optical techniques Quality of service Telecommunication traffic Wavelength division multiplexing Protocols WDM networks Optical fiber networks Stimulated emission Dynamic scheduling

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：