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Hybrid open hash tables for network processors

Hybrid open hash tables for network processors

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IEEE Workshop on High Performance Switching and Routing

作者： Qing Ye D. Parson Liang Cheng Laboratory Of Networking Group Department of Computer Science and Engineering Lehigh University Bethlehem PA USA Agere Systems Allentown PA USA

Packet classification by analyzing the traffic header information is an essential task of network processors. To efficiently store, retrieve and update information, key-based data accessing algorithms such as hashing are usually used to improve the processing performance. In this paper, we propose the hybrid open hash, a composite algorithm that combines open addressing hash tables with the temporal responsiveness of incremental garbage collection. By dynamically switching between a novel table with incremental construction via selective copying of used entries, and an aged table with incremental cleaning via emptying of deleted entries, this algorithm solves the structural problem of conventional open hashing due to remnants left by deleted keys. Thus, it increases the data accessing speed. We also implement and compare our algorithm with Brutil, the latest proposed hashing mechanism designed for real-time embedded systems, from the concurrency issue of multithreading to the performance simulation by taking the real traffic information to construct hashed keys. Our results show that hybrid open hash has better performance. Several possible enhancement approaches are also discussed to improve the performance further.

关键词： Information analysis Telecommunication traffic Information retrieval Delay Aging Cleaning Algorithm design and analysis Real time systems Embedded system Concurrent computing

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Joint Scheduling of Rate-guaranteed and Best-effort Services over a Wireless Channel

Joint Scheduling of Rate-guaranteed and Best-effort Services...

引用

IEEE Conference on Decision and Control

作者： M. Zafer E. Modiano Laboratory for Information and Decision Systems Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology USA

We address multi-user scheduling over the down-link channel in wireless data systems. Specifically, we consider a time-slotted system with a single transmitter serving multiple users. With fixed power transmission, the channel condition of a user determines the reliable rate of communication to that user in a particular time-slot. The user set consists of, (i) throughput guaranteed (QoS) users, and, (ii) best effort (BE) users. For such a system we obtain the optimal policy that serves the QoS users with minimum time-slot utilization, thereby, maximizing the remaining fraction of time-slots allocated to the BE users. We present a simple geometric visualization of the optimal policy. In the special scenario of symmetric Rayleigh fading, we obtain explicit formulas that relate the achievable throughput rate guarantee to the number of QoS users supportable and the fraction of time-slots allocated to the BE users. Finally, we compare the throughput results for the optimal policy with the random-scheduling policy and show that gains on the order of ln(N) can be achieved by exploiting multi-user diversity, where N is the number of QoS users.

关键词： Quality of service Throughput Downlink Data systems Rayleigh channels Delay Time varying systems Base stations Mobile handsets Space technology

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A service-oriented, scalable approach to grid-enabling of legacy scientific applications

A service-oriented, scalable approach to grid-enabling of le...

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IEEE International Conference on Web Services (ICWS)

作者： Vivekananthan Sanjeepan A. Matsunaga L. Zhu H. Lam J.A.B. Fortes Advanced Computing and Information Systems (ACIS) Laboratory Department of Electrical and Computer Engineering University of Florida USA

This paper describes a scalable approach to the enabling of legacy scientific applications on computing grids using a service-oriented architecture. In the context of this paper grid-enabling means turning an existing application, installed on a grid resource, into a service and generating the application-specific user interfaces to use that application through a Web portal. Scalability is achieved by providing a common abstraction for a category of applications and providing a "generic" application service to wrap those applications as services. The focus of this paper's approach is on grid-enabling "command-oriented" scientific applications. The novel aspect of the approach is that the entire process -from turning an application into a service to the user-interface generation for that application - is done automatically, without requiring coding or grid-system downtime. Portlet technology is used to dynamically generate application-specific interfaces. Further, the approach makes it possible to customize the applications for different user groups by way of simplifying, restricting or composing the functionalities of applications. The approach is useful for building grid portals on which a large number of applications need to be dynamically enabled.

关键词： Portals Grid computing Middleware Application software Turning Mesh generation Context-aware services User interfaces Information systems Laboratories

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Innovations in teaching energy systems utilizing an integrated simulation environment

Innovations in teaching energy systems utilizing an integrat...

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IEEE General Meeting Power& Energy Society

作者： O.A. Mohammed S. Liu Z. Liu N. Abed S. Ganu Department of Electrical and Computer Engineering Energy Systems Laboratory Florida International University Miami FL USA

The purpose of this presentation is to show the latest efforts by the authors in the development of integrated drive simulation environment. Furthermore, we present the utilization of these research developments into the classroom and how it can be integrated into lectures. We want to help students acquire the knowledge related to actual operations of integrated power systems, for example, the physical behavior of various electrical components, interactions of the individual components with each other during dynamic operations. We could also show component reactions to changes in system parameters or operation conditions as well as study the effects of design changes. The development of physical component modeling and the integrated coupling of these realistic physical modeling with the over all system have led to the creation of realistic practical system that is capable of simulating dynamic operations. This environment also includes hardware-in-the-loop ability along with distributed simulation in order to achieve research innovations in addition to the associated education benefits.

关键词： Technological innovation Education Circuit faults Iron Power system simulation Power system modeling Power system dynamics Pulse width modulation Inductance Transient analysis

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Adaptive statistical sampling methods for decentralized estimation and detection of localized phenomena

Adaptive statistical sampling methods for decentralized esti...

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International Symposium on Information Processing in Sensor Networks (IPSN)

作者： E.B. Ermis Venkatesh Saligrama Information Systems and Sciences Laboratory Department of Electrical and Computer Engineering Boston University Boston MA USA

Sensor networks (SNETs) for monitoring spatial phenomena has emerged as an area of significant practical interest. We focus on the important problem of detection of distributed events, sources, or abnormalities that are localized, i.e., only a small number of sensors in the vicinity of the phenomena are in the field of observation. This problem complements the standard decentralized detection problem, where noisy information about an event is measured by the entire network. For localized phenomena the main difficulty arises from the coupling of: a) noisy sensor observations that lead to local false positives/negatives; and b) limited energy, which constrains communication among sensor nodes. Together these difficulties call for reaching a decentralized statistical ordering based on limited collaboration. We are then led to the following fundamental problem: determine the most probable event locations while minimizing communication cost. Our objective in this paper is to characterize the fundamental trade offs between global performance (false alarms and miss rate) and communication cost. We develop a framework to minimize the communication cost subject to worst-case misclassification constraints by making use of the false discovery rate (FDR) concept along with an optimal local measure transformation at each sensor node. The preliminary results show that the FDR concept applied in a sensor networks context leads to significant reduction in the communication cost of the system. A very interesting implication of this work is that the detection performance of a wireless sensor network is comparable to that of a wired network of sensors.

关键词： Sampling methods Sensor phenomena and characterization Event detection Wireless sensor networks Monitoring Measurement standards Collaboration Cost function Sensor systems Context

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A Framework for Rule-Based Management of Parallel Scientific Applications

A Framework for Rule-Based Management of Parallel Scientific...

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International Conference on Autonomic Computing (ICAC)

作者： Hua Liu M. Parashar The Applied Software Systems Laboratory Department of Electrical and Computer Engineering Rutgers University Piscataway NJ USA

In this paper we present the design of the rule-based framework for the runtime management of high-performance parallel scientific applications. The framework addresses the formulation of application management behaviors as reaction rules, the injection of rules at runtime, their correct, efficient and scalable parallel enforcement, and the detection and resolution of rule conflicts. Unlike rule-based frameworks in business management and security and resource management domains, the presented framework focuses on high-performance parallel scientific applications, which require consistent and efficient management across processors and components. The framework is part of the Accord programming system (Liu et al., 2004)

关键词： Actuators Resource management Application software Software systems Laboratories Large-scale systems Computational modeling Runtime environment Environmental management Security

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Multiobjective optimization of air-core linear permanent magnet synchronous motors for improved thrust and low magnet consumption

Multiobjective optimization of air-core linear permanent mag...

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International Conference on electrical Machines and systems (ICEMS)

作者： S. Vaez-Zadeh A.H. Isfahani Advanced Motion Systems Research Laboratory Department of Electrical and Computer Engineering University of Tehran Tehran Iran

In this paper a multiobjective design optimization of an air-core linear permanent magnet synchronous motor is presented. Thrust, thrust ripple and consumed magnet volume are chosen as objectives for design optimizati... 详细信息

关键词： Permanent magnet motors Synchronous motors Magnetic flux Magnetic separation Design optimization Coils Topology Iron Maxwell equations Laboratories

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A context-sensitive and user-centric approach to developing personal assistants

A context-sensitive and user-centric approach to developing ...

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2005 AAAI Spring Symposium

作者： Des Jardins, Marie Eaton, Eric Wagstaff, Kiri University of Maryland Baltimore County Computer Science and Electrical Engineering Department 1000 Hilltop Circle Baltimore MD 21250 Jet Propulsion Laboratory Machine Learning Systems Group 4800 Oak Grove Drive Pasadena CA 91109

Several ongoing projects in the MAPLE (Multi-Agent Planning and LEarning) lab at UMBC and the Machine Learning systems Group at JPL focus on problems that we view as central to the development of persistent agents. This position paper describes our current research in this area, focusing on four topics in particular: effective use of observational and active learning, utilizing repeated behavioral contexts, clustering with annotated constraints, and learning user preferences. Copyright © 2005, American Association for Artificial Intelligence (***). All rights reserved.

关键词： Artificial intelligence

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Acoustic noise signal evaluation due to magnetostrictive effects in electrical equipment

Acoustic noise signal evaluation due to magnetostrictive eff...

引用

IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics

作者： O.A. Mohammed N.Y. Abed S. Ganu Shuo Liu Department of Electrical and Computer Engineering Energy Systems Laboratory Florida International University Miami FL USA

The inverse magnetostriction effect (IME) is investigated for noise generation, identification and evaluation in shipboard propulsion machinery applications. The finite element (FE) implementation is performed on an example drive motor in two dimensions. The FE implementation results show an increase in the forces acting on the ferromagnetic region causing more deformation in the stationary core. This deformation causes increased vibration and hence an audible noise generation. Wavelet analysis of displacement waveforms at selected points shows the involved frequency range causing noise during the operation. The results confirm the magnetostrictive origin of noise production. The importance of such information can be realized and utilized for the reduction of noise in machinery problems especially in sensitive applications.

关键词： Acoustic noise Magnetic devices Magnetostriction Magnetostrictive devices Machinery Noise generators Propulsion Finite element methods Magnetic cores Wavelet analysis

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All-optical 3R regeneration in monolithic SOA-MZI to achieve 0.4 million km fiber transmission

All-optical 3R regeneration in monolithic SOA-MZI to achieve...

引用

IEEE Photonics Conference (IPC)

作者： M. Funabashi Zuqing Zhu Zhong Pan S.J.B. Yoo L. Paraschis Department of Electrical and Computer Engineering University of California Davis CA USA Optical networking Cisco Systems Inc. San Jose CA USA

An all-optical 3R regenerator that combines reshaping in SOA-MZIs and retiming in synchronously modulated LiNbO/sub 3/ modulator is demonstrated in a fiber-recirculation loop to achieve up to 0.4 million km linear tra... 详细信息

关键词： Repeaters Optical interferometry Optical modulation Optical filters Fiber nonlinear optics Optical solitons Nonlinear optics Bit error rate Optical fiber networks Pulse modulation

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