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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

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A linear algebraic approach to queueing theory

A linear algebraic approach to queueing theory

引用

Symposium on Applied Computing

作者： L.R. Lipsky A. van de Liefvoort Department of Computer Science and Engr Booth Research Center University of Connecticut Storrs CT USA Computer Science Telecommunications Program University of Missouri Kansas City Kansas City MO USA

A survey of the basic formulas of queueing theory is presented, indicating their limitations in dealing with non-exponential service time distributions and non-steady-state behavior. The authors then describe a linear algebraic formulation which is a complete procedure for dealing with non-exponential servers. The formulation is invariant to a class of similarity transformations and thus does not depend on the phases used to describe the servers. The authors show how to treat M/G/1, G/M/1 and G/G/1 queues using this formalism. Finally, they show how transient properties of queueing systems can be calculated, using the same mathematical objects which were used for analyzing their steady-state properties.< >

关键词： Queueing analysis computer science Steady-state Time measurement Distributed computing Numerical stability Cities and towns Transient analysis

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A split input sunshine switch architecture

A split input sunshine switch architecture

引用

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

作者： T. Bearly J.P. Agrawal AT and T Kansas City MO USA Computer Science Telecommunications Program University of Missouri Kansas City Kansas City MO USA

We present the split input sunshine switch, a new ATM switch architecture based on the sunshine switch, which utilizes two distinct input fabrics, primary and secondary, within a sunshine switch architecture. The primary input fabric is sized at the desired size, N/spl times/N, and the secondary switch is sized at N/z /spl times/ N/z, where z is a non-zero power of two. The introduction of the secondary input fabric allows a portion of the primary input fabric's input lines to be used to handle recirculating cells. For medium and large switch sizes, the hardware requirements of this new architecture is shown to be less than that of the original sunshine design for the same quality of service. computer simulations have been performed on the sunshine switch and the split input sunshine switch in order to select design parameters and compare performance.

关键词： Switches Asynchronous transfer mode Telecommunication switching Delay computer architecture Cities and towns Fabrics Telecommunication traffic Costs ISDN

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A zerotree stereo video encoder

A zerotree stereo video encoder

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： S. Thanapirom W.A.C. Fernando E.A. Edirisinghe Telecommunications Program Asian Institute of Technology Klong Luang Pathum Thani Thailand Department of Computer Science Loughborough University Leicestershire UK

Over the past decade, the growing interests in realistic visual communication systems have led to the rapid development of 3D visual compression techniques. A stereoscopic system is one way of simulating 3D perception. Without exploiting the high redundancy in a stereo pair, the amount of data required to store or transmit it is doubled, when compared to that for monocular images. In this paper, we present a new technique for coding stereo video sequences based on the Discrete Wavelet Transform (DWT). The proposed technique exploits Zerotree Entropy Coding (ZTE) that makes use of the wavelet block concept to achieve low bit rate stereo video coding. One of the two image streams, the main stream, is independently coded by a modified zerotree video coder and the second stream, the auxiliary stream, is predicted based on disparity compensation. The residual image of the auxiliary stream is then coded by a modified zerotree video coder. Results show that the proposed encoder can achieve 50% bandwidth reduction compared to the ZTE based monoscopic compression encoder.

关键词： Streaming media Video compression Discrete wavelet transforms Image coding Visual communication Video sequences Entropy coding Bit rate Video coding Bandwidth

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Routing strategies for fault recovery in wide area packet networks

Routing strategies for fault recovery in wide area packet ne...

引用

MILCOM, Military Communications Conference

作者： K. Balakrishnan D. Tipper D. Medhi ECE Department Clemson University Clemson SC USA Telecommunications Program University of Pittsburgh Pittsburgh PA USA Computer Science Telecommunications University of Missouri Kansas City Kanas MO USA

We present the results of a study of routing algorithms for traffic restoration after a failure in a virtual circuit packet switched wide area network. Standard routing algorithms based on minimizing the steady state network delay may not be appropriate for rerouting the calls after a failure, in view of the transient congestion. We propose alternative routing schemes to reduce the congestion. The results of a simulation study of a 10 node network comparing the performance of the different routing algorithms (i.e., minimum delay, minimum hop, load distribution on paths, load distribution on links) are presented.

关键词： Routing Intelligent networks Packet switching Steady-state Traffic control Switching circuits Circuit simulation Failure analysis Communication system traffic control Circuit testing

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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

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Pipelined Implementation of TCAM-Based Search Engines in High-Performance IP Routers

Pipelined Implementation of TCAM-Based Search Engines in Hig...

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IEEE GLOBECOM 2008 - 2008 IEEE Global telecommunications Conference

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

Search engine is a critical component in several stages of a pipeline flow in high-performance IP routers. To achieve high performance, it has been proposed to use TCAMs to implement search engines in hardware. In this paper, the state- of-art TCAM-based MSMB-LPT scheme is used as an example to show how to introduce pipelining into TCAM-based search by presenting pipelined scheme P-MSMB-LPT. It is shown that P-MSMB-LPT eliminates the unnecessary hazard that exists in the MSMB-LPT scheme, and achieves near-optimal speedup with almost no additional hardware overhead.

关键词： Search engines Pipeline processing Routing Hazards Security Throughput computer science Hardware Telecommunication computing Delay

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Hardware reuse in modern application-specific processors and accelerators

Hardware reuse in modern application-specific processors and...

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2011 14th Euromicro Conference on Digital System Design: Architectures, Methods and Tools, DSD 2011

作者： Nery, Alexandre S. Jozwiak, Lech Lindwer, Menno Cocco, Mauro Nedjah, Nadia França, Felipe M.G. LAM - Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering Universidade do Estado do Rio de Janeiro Brazil Department of Electrical Engineering - Electronic Systems Eindhoven University of Technology Netherlands Silicon Hive - Intel UMG Netherlands

ISBN: (纸本)9780769544946

Effective exploitation of the application-specific parallel patterns and computation operations through their direct implementation in hardware is the base for construction of high-quality application-specific (re-) configurable application specific instruction set processors (ASIPs) and hardware accelerators for modern highly-demanding applications. Although it receives a lot of attention from the researchers and practitioners, a very important problem of hardware reuse in ASIP and accelerator synthesis is clearly underestimated and does not get enough attention in the published research. This paper is an effect of an industry and academic collaborative research. It analyses the problem of hardware sharing, shows its high practical relevance, as well as a big influence of hardware sharing on the major circuit and system parameters, and its importance for the multi-objective optimization and tradeoff exploitation. It also demonstrates that the state-of-the-art synthesis tools do not sufficiently address this problem and gives several guidelines related to enhancement of the hardware reuse. © 2011 IEEE.

关键词： Multiobjective optimization

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Characteristic Time based Routing in Information Centric Networks

Characteristic Time based Routing in Information Centric Net...

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International Conference on Computing, Networking and Communications

作者： Bitan Bandyopadhyay Anand Seetharam Amitava Mukherjee Mrinal Kanti Naskar Department of Electronics and Telecommunications Engineering Jadavpur University Computer Science Program California State University Monterey Bay IBM India Pvt. Limited

ISBN: (纸本)9781467385800

Information centric networking (ICN) aims to transform today's Internet from a host-centric model to a content-centric one by caching content internally within the network at storage-enabled nodes. Recently, multiple routing and cache management strategies have been proposed [1]-[6] to improve the user-level performance (e.g., content-download latency) in ICN. In this paper, we propose a simple routing strategy that leverages the concept of characteristic time to improve content-download latency. Characteristic time for a content in a cache indicates the amount of time in future a recently accessed content is likely to remain in that cache. Our proposed algorithm (CTR) uses characteristic time information to forward requests to caches where the content is likely to be found. CTR augments native routing strategies (e.g., Dijkstra's algorithm), works with existing cache management policies and thus can be implemented in ICN prototypes with minimal effort. We perform exhaustive simulations using realistic Internet topologies (e.g., GEANT, WIDE, TISCALI, ROCKETFUEL [7]) and demonstrate that the CTR algorithm provides approximately 10-50% improvement in latency over state-of-the-art routing and caching management strategies for ICN for a wide range of simulation parameters.

关键词： Routing Algorithm design and analysis Approximation algorithms Data structures Prototypes Internet topology

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High-performance TCAM-based IP lookup engines

High-performance TCAM-based IP lookup engines

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IEEE Conference on computer Communications Workshops, INFOCOM Wksps

作者： Hui Yu Jing Chen Jianping Wang S.Q. Zheng Computer Engineering Program University of Texas Dallas Richardson TX USA Telecommunications Engineering Program 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 at Dallas Richardson 75083 USA

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.

关键词： Search engines Internet Routing Costs Associative memory computer science Hardware Random access memory Energy consumption Telecommunication computing

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