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检索条件"任意字段=Conference on All-Optical Communication Systems: Architecture, Control and Network Issues"

共 2534 条记录，以下是1951-1960 订阅

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A fairness study of the adaptive RIO active queue management algorithm

A fairness study of the adaptive RIO active queue management...

引用

Mexican International conference on Computer Science (ENC)

作者： R. Cartas J. Orozco J. Incera D. Ros ITAM Mexicali Mexico GET/ENST Bretagne IRISA ARMOR Research Team Rennes France GET/ENST Bretagne IRISA ARMOR Research Team Cesson-Sevigne France

Active queue management (AQM) mechanisms manage queue lengths by dropping packets when congestion is building up; end-systems can then react to such losses by reducing their packet rate, hence avoiding severe congestion. They are also very useful for the differentiated forwarding of packets in the DiffServ architecture. Many studies have shown that setting the parameters of an AQM algorithm may prove difficult and error-prone, and that the performance of AQM mechanisms is very sensitive to network conditions. The adaptive RIO mechanism (A-RIO) addresses both issues. It requires a single parameter, the desired queuing delay and adjusts its internal dynamics accordingly. A-RIO has been thoroughly evaluated in terms of delay response and network utilization but no study has been conducted in order to evaluate its behaviour in terms of fairness. By way of ns-2 simulations, This work examines A-RIO's ability to fairly share the network's resources (bandwidth) between the flows contending for those resources. Using Jain's fairness index as our performance metric, we compare the bandwidth distribution among flows obtained with A-RIO and with RIO.

关键词： Quality of service Aggregates Diffserv networks Bandwidth Harmonic analysis Traffic control Tin Throughput communication system traffic control Delay

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controller-pilot data link communications (CPDLC) Build 1 value-added services

Controller-pilot data link communications (CPDLC) Build 1 va...

引用

conference on Digital Avionics systems (DASC)

作者： R. Bolczak J.C. Gonda III W.J. Saumsiegle R.A. Tornese The MITRE Corporation Center for Advanced Aviation System Development McLean Virginia USA The MITRE Corporation Center for Advanced Aviation System Development McLean Virginia

The Federal Aviation Administration's (FAAs) controller-pilot data link communications (CPDLC) Build 1 system began initial daily use (IDU) at Miami Air Route Traffic control Center (ARTCC) on October 7, 2002. CPDLC utilizes the aeronautical telecommunications network (ATN) and very high frequency digital link (VDL) mode 2 to transmit digital messages between air traffic controllers and pilots in specially equipped aircraft. In addition to the FAA and the Miami ARTCC, stakeholders include ARINC, American Airlines, Continental Airlines, Delta Airlines, Atlantic Southeast Airlines (ASA), the United States Air Force, Rockwell Collins, and Teledyne. CPDLC Build 1 consists of four basic services: transfer of communications (TOC) for directing a pilot to change the assigned voice frequency; initial contact (IC) for verification of the pilot's assigned altitude; altimeter setting (AS) for uplinking barometric pressure data, and menu text (MT) for uplinking a predefined set of text messages. These services are invoked through five message types: contact; monitor, usually combined with confirm assigned level (CAL); "independent" CAL; altimeter setting; and menu text. CPDLC Build 1 was to have been the first step in an evolution of data link capabilities that would eventually provide data link services to all centers through a series of builds intended to keep pace with similar developments in Europe. It was planned to be a limited duration, single site implementation to prove the viability of CPDLC procedures and capabilities, to be followed by the national deployment of CPDLC Build 1A. However, in April 2003, the FAA's Joint Resources Council (JRC) decided to defer CPDLC Build 1A, but directed the CPDLC team to prepare a sustainment plan for continued Build 1 operations in Miami. The sustainment plan (2003) was prepared in July 2003 and included plans for the resolution of existing operational issues and implementation of program refinements. Key among the latter included e

关键词： communication system control FAA Telecommunication control Frequency Air traffic control Costs communication system traffic control control systems Traffic control Aircraft

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A self-organized clustering algorithm for UWB ad hoc networks

A self-organized clustering algorithm for UWB ad hoc network...

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IEEE conference on Wireless communications and networking

作者： M.X. Gong S.F. Midkiff R.M. Buehrer Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

This paper describes a one-hop self-organized clustering (SOC) algorithm developed specifically for ultra-wideband (UWB) networks. Our research is motivated by the strict regulation of the transmit power of UWB devices, as imposed by U.S. Federal communications Commission (FCC). To comply with FCC power regulations and to maximize network capacity, we propose a heuristic clustering algorithm to form clusters that have the minimum total power emission subject to constraints on radio range and multiple access capacity. Simulation results show that the proposed algorithm performs better than a random selection algorithm in terms of power emission under all circumstances. Furthermore, the performance of the SOC algorithm can approach that of the k-means algorithm when an appropriate upper limit on the number of nodes in a cluster is imposed.

关键词： Clustering algorithms Ad hoc networks Peer to peer computing FCC communication system traffic control Relays Educational institutions Large-scale systems Computer architecture Ultra wideband technology

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SDMap: An Abstraction for Collecting Data over a Sensor network

SDMap: An Abstraction for Collecting Data over a Sensor Netw...

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Proceedings of the Third IASTED International conference on Wireless and optical communications

作者： Tobe, Yoshito Department of Information Systems Tokyo Denki University 2-2 Kanda-Nishiki-cho Chiyoda-Ku Tokyo 101-8457 Japan

ISBN: (纸本)0889863741

This paper presents a new model for sensor networks, Shared Distribution Map (SDMap). One challenge for sensor networks from the perspective of a network architecture is the way the recipients of sensor data handle them. Instead of a socket-type interface, we provide a two-dimensional map of data distribution that is visible to all receiving nodes. SDMap has several features: automatic elaboration of an area exhibiting a large change in data, data freshness control, and synchronization among caches. A recipient can either subscribe to a portion of the map or request for data at specific area without being aware of the underlying network. In this paper we describe the design issues for SDMap.

关键词： optical communication

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Two-tiered wireless sensor network architecture for structural health monitoring

Two-tiered wireless sensor network architecture for structur...

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Smart Structures and Materials 2003 conference

作者： Kottapalli, VA Kiremidjian, AS Lynch, JP Carryer, E Kenny, TW Law, KH Lei, Y Stanford Univ Dept Civil & Environm Engn Stanford CA 94305 USA

ISBN: (纸本)0819448621

In this paper, we make a brief study of some of the important requirements of a structural monitoring system for civil infrastructures and explain the key issues that are faced in the design of a suitable wireless monitoring strategy. Two-tiered wireless sensor network architecture is proposed as a solution to these issues and the protocol used for the communication in this network is described. The power saving strategies at various levels, from the network architecture, to communication protocol, to the sensor unit architecture are explained. A detailed analysis of the network is done and the implementation of this network in a laboratory setting is described.

关键词： structural health monitoring wireless sensor networks time division multiple access (TDMA) spread spectrum power cycling

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Feature and Performance Enhancements of Dynamic optical networks

Feature and Performance Enhancements of Dynamic Optical Netw...

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optical Fiber communication conference (OFC)

作者： Hansen, P. Photuris Piscataway NJ

The various aspects of performance enhancements of dynamic optical networks are discussed. In this regard, carrier requirements for flexible, programmable optical transport networks in the context of emerging components and sub-systems were discussed. The various carrier requirements include installation costs, bandwidth prices, network services, network performance, switching, and power control and monitoring. Modular architecture are also one of the attractive network subsystem features from a capital expenditure perspective deferring common equipment cost until the additional wavelengths are actually required.

关键词： optical communication

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Photonic MEMS based reconfigurable switch for multicast communication systems 4

Photonic MEMS based reconfigurable switch for multicast comm...

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4th National conference on Telecommunication Technology (NCTT 2003)

作者： Alam, MS Baker, AAA Univ S Alabama Dept Elect & Comp Engn Mobile AL 36608 USA

ISBN: (纸本)0780377737

Fiber-optic communication has changed the information landscape over the last two decades. It has provided the information technology revolution with the high data rate networks it needed. A severe limitation of the current fiber networks is caused by the use of electronics in switching and routing. An all-optical fiber network, where there is no need for signal convention between optics and electronic, is the answer to such a demand. In this paper we introduce a new approach to implement a transparent all-optical, non-blocking cross connect switch for routing. An all-optical fiber network, where there is no need for signal conversion between optics and electronic, is the answer to such a demand. In this paper we introduce a new approach to implement a transparent all-optical, non-blocking cross connect switch for routing optical network traffic. This approach is based on the combination of MEMS, diffractive optical elements, and optical fibers. The proposed cross-connect will be programmable to configure the network as needed. In this paper we develop MINs (using MEMS based switches as the backbone) to support multicast while reducing crosstalk and control complexity. We develop reordering algorithms and design a slot-permuter to adapt to all changes for multicast support. Finally we will verify the performance and effectiveness of our algorithms and the slot permuter through theoretical analysis and extensive simulation.

关键词： Algorithm design and analysis communication switching Micromechanical devices Multicast algorithms Multicast communication optical crosstalk optical fiber communication optical fiber networks optical switches Routing

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A policy-based approach to firewall management

引用

1st International conference on network control and Engineering for Quality of Service, Security and Mobility (Net-Con 2002)

作者： Caldeira, F Monteiro, E Polytechnic Institute of Viseu ESTV - Department of Informatics Portugal University of Coimbra Centre for Informatics and Systems (CISUC) Portugal

ISBN: (纸本)1402072686

This paper describes a policy-based approach to firewall management. The Policy-Based networking (PBN) architecture proposed by the Policy Framework Group of IETF is analysed, together with the communication protocols, policy specification languages, and the necessary information models. The paper continues with a description of an application of the PBN architecture to firewall management. The proposed architecture is presented and its implementation issues are analysed with some usage examples. The paper concludes with the evaluation of the policy-based approach to firewall management.

关键词： network security policy-based networking COPS COPS-PR SPSL

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DMD: network device driver architecture for high-performance systems 7

DMD: Network device driver architecture for high-performance...

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7th International conference on Telecommunications, ConTEL 2003

作者： Andjelic, Mario System Interconnect and Control Ericsson AB Stockholm Sweden

ISBN: (纸本)9531840520

communication pattern in cluster internetworking consists of high frequency of small messages. Overhead for this type of communication exhibited by network subsystems of standard operating systems is bottleneck, thus preventing application from full utilization of high-performance communication technologies. This paper describes behavior of standard network subsystems and describes novelty network device driver architecture, fully transparent to the rest of the system that addresses extreme performance requirement by using off-the-shelf components (Gigabit Ethernet). The result of this prototype shows significant performance gain compared with standard network subsystems. © 2003, Institute of Electrical and Electronics Engineers Inc. all rights reserved.

关键词： Dynamic mode decomposition

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Next generation network 3 to 6 dimensional cluster communication architecture 7

Next generation network 3 to 6 dimensional cluster communica...

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7th International conference on Telecommunications, ConTEL 2003

作者： Cohen, A.A. Department of Computer Science University of Bar-Ilan Israel

ISBN: (纸本)9531840520

This paper deals with the communication and architectural issues of current systems. At present, switching speeds are two slow when switching tasks between clusters of 'n' processing nodes positioned in a volume of space, on a geographical map containing one or more communication buses. The research goal was to improve the switching speed, hence enhancing the performance of Storage and Retrieval Communicating System that contains clusters of 'n' processing nodes. To improve the performance of a communicating system means reducing access time for searching, storing and retrieving knowledge of known data patterns. Unique algorithms and unique bus architectures were created for storage retrieval and communication between processing nodes. Each processing node is positioned on a geographical map bus containing complex 'network layers', comprising of multiple communicating bus connecting mini, maxi, intelligent processing nodes. The said 'network layers' are the next generation network for the Brain-like massively parallel distributed or tightly coupled computing systems. A Simulation that demonstrates the operation of the novel architecture and comparison of a novel Global Positioning System (GPS) architecture versus current ones is given. © 2003, Institute of Electrical and Electronics Engineers Inc. all rights reserved.

关键词： Clustering algorithms

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