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20th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2006

作者： El-Moursy, Ali Garg, Rajeev Albonesi, David H. Dwarkadas, Sandhya Departments of Electrical and Computer Engineering and of Computer Science University of Rochester United States Computer Systems Laboratory Cornell University United States

ISBN: (纸本)1424400546

The industry is rapidly moving towards the adoption of Chip Multi-Processors (CMPs) of Simultaneous Multi-Threaded (SMT) cores for general purpose systems. The most prominent use of such processors, at least in the near term, will be as job servers running multiple independent threads on the different contexts of the various SMT cores. In such an environment, the co-scheduling of phases from different threads plays a significant role in the overall throughput. Less throughput is achieved when phases from different threads that conflict for particular hardware resources are scheduled together, compared with the situation where compatible phases are co-scheduled on the same SMT core. Achieving the latter requires precise per-phase hardware statistics that the scheduler can use to rapidly identify possible incompatibilities among phases of different threads, thereby avoiding the potentially high performance cost of inter-thread contention. In this paper, we devise phase co-scheduling policies for a dual-core CMP of dual-threaded SMT processors. We explore a number of approaches and find that the use of ready and in-flight instruction metrics permits effective co-scheduling of compatible phases among the four contexts. This approach significantly outperforms the worst static grouping of threads, and very closely matches the best static grouping, even outperforming it by as much as 7%. © 2006 IEEE.

关键词： Multiprocessing systems

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A closed-form analytical model for single nanoshells

A closed-form analytical model for single nanoshells

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作者： Alam, Mehboob Massoud, Yehia IEEE Electrical and Computer Engineering Department Rice University Houston TX 77005 United States Rice Automated Nanoscale Design Group Rice University Houston TX Departments of Electrical and Computer Engineering and Computer Science

In this paper, we develop an accurate analytical closed-form model for the frequency resonance and scattering characteristics of single nanoshells. Nanoshells, dielectric spheres that are coated with noble metal, posses excellent tunability of their resonance frequency as a function of the relative sizes of the core and the thickness of the shell. Consequently, nanoshells offer much improved sensitivity, specificity, and cost-effectiveness in their applications. Simulation results show that our new closed-form model matches very closely with the exact solution for typical nanoshell configurations used in near-infrared applications. © 2006 IEEE.

关键词： Nanostructured materials

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Automotive electronics: Steady growth for years to come!

Automotive electronics: Steady growth for years to come!

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ASP-DAC 2006: Asia and South Pacific design Automation Conference 2006

作者： Sangiovanni-Vincentelli, Alberto Department of Electrical Engineering and Computer Science University of California Berkeley United States Cadence Design Systems United States

No abstract available

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design of compliant MEMS grippers for micro-assembly tasks

Design of compliant MEMS grippers for micro-assembly tasks

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IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Kang, Byoung Hun Wen, John T. Department of Mechanical Design Engineering Korea Polytechnic University Kyonggi-Do South Korea Mechanical Aerospace and Nuclear Engineering Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 United States

ISBN: (纸本)9781424402588

Due to their monolithic construction and superior wear and loss properties, flexure joints have been used to reduce the mechanism size and increase the positioning accuracy. The compliance of flexure joints, however, can affect the static and dynamic characteristics of the overall mechanism. To design mechanisms containing flexure joints, we have proposed a multi-objective optimization approach to take into account the multitude of performance metrics and design constraints. A Pareto frontier is first computed, and secondary design criteria, such as sensitivity and dynamic characteristics, are then applied to select the final design. To reduce the computation load and facilitate design iteration, a lumped spring approximation, the Paros-Weisbord model, is used to characterize the flexure joints and the pseudo-rigid-body model is used as an approximate description of mechanisms. This paper presents this approach applied to the design of a micro-gripper. The performance metrics are chosen to be the manipulability of the gripper opening and the decoupling of a stiffness matrix (reflecting the remote center of compliance criterion). Different design and initial fabrication results are included.

关键词： flexure mechanism micro-gripper MEMS optimal design

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design and implementation of flexible resampling mechanism for high-speed parallel particle filters

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Journal of VLSI Signal Processing systems for Signal, Image, and Video Technology 2006年第1-2期44卷 47-62页

作者： Hong, Sangjin Chin, Shu-Shin Djurić, Petar M. Bolić, Miodrag Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University - SUNY Stony Brook NY 11794-2350 School of Information Technology and Engineering University of Ottawa Ottawa Ont. K1N 6N5 Canada

There are many applications in which particle filters outperform traditional signal processing algorithms. Some of these applications include tracking, joint detection and estimation in wireless communication, and computer vision. However, particle filters are not used in practice for these applications mainly because they cannot satisfy real-time requirements. This paper presents an efficient resampling architecture for parallel particle filtering. The proposed architecture is flexible such that it supports various modes of parallel resampling operations with up to four processing elements. The resampling algorithm is developed in order to compensate for possible error caused by finite precision quantization in the resampling step. Communication between the processing elements after resampling is identified as an implementation bottleneck, and therefore, concurrent buffering is incorporated in order to speed up communication of particles among processing elements. The flexible resampling mechanism is implemented in 0.35 μ m CMOS process and its complexity and performance are analyzed. © 2006 Springer Science + Business Media, LLC.

关键词： Digital filters

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On packet aggregation mechanisms for improving VoIP quality in mesh networks

On packet aggregation mechanisms for improving VoIP quality ...

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2006 IEEE 63rd Vehicular Technology Conference, VTC 2006-Spring

作者： Kyungtae, Kim Ganguly, Samrat Izmailov, Rauf Sangjin, Hong IP Network and Distributed Systems NEC Laboratories America Princeton NJ 08540 Mobile Systems Design Laboratory Department of Electrical and Computer Engineering State University of NY Stony Brook NY 11794

ISBN: (纸本)0780393929

Performance in multihop wireless networks is known to degrade with the number of hops for both TCP and UDP traffic. For VoIP, the wireless network presents additional challenges as the perceived quality is dependent on loss, delay and jitter. Furthermore, small size of VoIP packets aggravates network utilization of the 802.11 based wireless mesh network. In this work, we evaluate the packet aggregation algorithms to reduce VoIP protocol overhead, compare the aggregation algorithms and propose a distributed packet aggregation mechanism. The experimental results demonstrates that the proposed distributed packet aggregation algorithm improves the VoIP quality and results in significant increase in the number high quality VoIP calls supported over multihop mesh. © 2006 IEEE.

关键词： Wireless networks

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Increasing object recognition rate using reinforced segmentation

Increasing object recognition rate using reinforced segmenta...

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2006 IEEE International Conference on Image Processing, ICIP 2006

作者： Sahba, Farhang Tizhoosh, Hamid R. Salama, Magdy M. A. Systems Design Engineering Pattern Analysis and Machine Intelligence Laboratory University of Waterloo Waterloo ON Canada Electrical and Computer Engineering Pattern Analysis and Machine Intelligence Laboratory University of Waterloo 200 University Ave W Waterloo ON Canada

ISBN: (纸本)1424404819

In this paper a new approach to object extraction and recognition based on reinforcement learning is presented. We use this novel idea as a method to optimally segment the image and increase the recognition rate. The success rate is compared with a classical approach. Preliminary results demonstrate increase in recognition rate. ©2006 IEEE.

关键词： Image segmentation

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Effect of RObust Header Compression (ROHC) and packet aggregation on multi-hop wireless mesh networks

Effect of RObust Header Compression (ROHC) and packet aggreg...

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6th IEEE International Conference on computer and Information Technology, CIT 2006

作者： Jung, Sangkil Hong, Sangjin Park, Peom Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University - SUNY Stony Brook NY 11794-2350 Department of Industrial and Information Engineering Ajou University Humintec Co. Ltd. Suwon Korea Republic of

ISBN: (纸本)076952687X

This paper evaluates the behavioral effect of RObust Header Compression (ROHC) and packet aggregation in multi-hop wireless mesh networks. ROHC itself shows around 20% achieved rate improvement on a line of wireless link even if as the number of mesh router increases, total achieved rate gradually decreases. Packet aggregation cooperating with ROHC provides 4 to 10 times achieved rate improvement and results in maximum 6 times reduction of end-to-end delay. Even if the ROHC and packet aggregation gives such a promising improvement, we need to identify effect of the processing time of the two schemes on overall wireless mesh network behaviors. To do this work, we measure/use ROHC processing time from Pentium 4 and RouterBOARD 230, and apply the results into NS-2 simulations. The simulation results show high performance improvement from ROHC and packet aggregation deteriorates as a general purpose processor in a mesh router takes much time to deal with the two schemes. This result motivates a hardware design be required to speed up the processing units of the two schemes. Consequently, we propose a hardware system model for ROHC and packet aggregation by using SystemC Hardware Description Language (HDL). From the SystemC results, we conclude the proposed built-in processor design for the two schemes keeps performance improvement by enhancing the low speed processing power of general purpose processors. © 2006 IEEE.

关键词： Wireless networks

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Tracking an object in 3-D space using particle filtering based on sensor array

Tracking an object in 3-D space using particle filtering bas...

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6th IEEE International Conference on computer and Information Technology, CIT 2006

作者： Jinseok, Lee Jaechan, Lim Sangjin, Hong Park, Peom Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University - SUNY Stony Brook NY 11794-2350 Department of Industrial and Information Engineering Ajou University Humintec Co. Ltd. Suwon Korea Republic of

ISBN: (纸本)076952687X

This paper presents a formulation of particle filter for tracking an object in 3-D space. The 3-D tracking algorithm is derived based on bearings only tracking algorithm that is applied in tracking of an object in 2-D space with one angle measurement. We investigate and present the fusion process of the algorithms. The performance of the proposed algorithms are evaluated in detail. © 2006 IEEE.

关键词： Tracking (position)

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Guest Editorial price-based access control and economics of networking

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IEEE Journal on Selected Areas in Communications 2006年第5期24卷 937-938页

作者： Mazumdar, Ravi R. Courcoubetis, Costas A. Duffield, Nick Kesidis, George Odlyzko, Andrew Srikant, R. Walrand, Jean University of Waterloo Department of Electrical and Computer Engineering Waterloo Ont. N2L 3G1 Canada Athens University of Economics and Business Department of Informatics Athens 10434 Greece AT and T Laboratories Florham Park NJ 07932-0971 United States Pennsylvania State University Department of Electrical and Computer Engineering University Park PA 16802 United States University of Minnesota Digital Technology Center Minneapolis MN 55455 United States University of Illinois at Urbana-Champaign Coordinated Science Laboratory Urbana IL 61801 United States University of California at Berkeley Department of Electrical Engineering and Computer Sciences Berkeley CA 94720 United States Department of Electrical and Computer Engineering University of Waterloo Waterloo Ont. Canada Department of Electrical and Computer Engineering Purdue University West Lafayette IN United States Royal Statistical Society Canada Canada Canada Canada Network Economics and Services Group Theory Economics and Systems Laboratory Athens University of Economics and Business Athens Greece Network Management and Performance Department AT and T Laboratories-Research Florham Park NJ United States Electrical Engineering and Computer Science and Engineering Departments Pennsylvania State University University Park United States Digital Technology Center United States University of Minnesota Minneapolis United States University of Illinois Urbana-Champaign United States Department of Electrical and Computer Engineering Canada Coordinated Science Laboratory United States Department of Electrical Engineering and Computer Sciences University of California at Berkeley Berkeley United States Belgian American Education Foundation United States

No abstract available

关键词： Access control Pricing Web and internet services IP networks Optimal control Quality of service Impedance History Internet telephony Convergence

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