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Location management & message delivery protocol in multi-region mobile agent computing environment

Location management & message delivery protocol in multi-reg...

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international conference on Distributed Computing systems

作者： SungJin Choi MaengSoon Baik ChongSun Hwang Department of Computer Science & Engineering Korea University Seoul South Korea

Location management and message delivery protocol is fundamental to the further development of mobile agent systems in a multiregion mobile agent computing environment in order to control mobile agents and guarantee message delivery between them. However, previous works have some problems when they are applied to a multiregion mobile agent computing environment. First, the cost of location management and message delivery is increased relatively. Second, a following problem arises. Finally, cloned mobile agents and parent & child mobile agents don't get dealt with respect to location management and message delivery. We present a HB (home-blackboard) protocol which is a new location management and message delivery protocol for mobile agents in a multiregion mobile agent computing environment. We have implemented the HB protocol. the HB protocol decreases the cost of location management and message delivery and solves the following problem with low communication cost. In addition, the HB protocol deals with the location management and message delivery of cloned and parent & child mobile agents, so that it guarantees message delivery of these mobile agents.

关键词： Environmental management Protocols Mobile agents Costs Engineering management control systems Home computing Mobile communication Distributed computing computer science

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End-to-end utilization control in distributed real-time systems

End-to-end utilization control in distributed real-time syst...

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international conference on Distributed Computing systems

作者： C. Lu X. Wang X. Koutsoukos Department of Computer Science and Engineering Washington University of Saint Louis Saint Louis MO USA Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

An increasing number of distributed real-time systems face the critical challenge of providing end-to-end quality of service (QoS) guarantees in open and unpredictable environments. In particular, such systems often need to guarantee the CPU utilization on multiple processors in order to achieve overload protection and meet end-to-end deadlines while task execution times are unpredictable. While the recently developed feedback control real-time scheduling algorithms have shown promise, they cannot handle the common end-to-end task model in distributed systems where each task is comprised of a chain of subtasks distributed on multiple processors. We present the end-to-end utilization control (EUCON) algorithm that features a distributed feedback loop that dynamically enforces desired CPU utilization bounds on multiple processors based on online performance measurements EUCON is based on a model predictive control approach that models the utilization control problem on a distributed platform as a multivariable constrained optimization problem. A multiinput-multioutput model predictive controller is designed based on a difference equation model that describes the dynamic behavior of distributed real-time systems. Both control theoretic analysis and simulations demonstrate that EUCON can provide robust utilization guarantees even when task execution times deviate from the estimation or vary significantly at run-time.

关键词： Distributed control control systems Real time systems Predictive models Quality of service Protection Feedback control Scheduling algorithm Distributed feedback devices Measurement

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Using lock-based checking protocol for efficient data broadcast in mobile environments

Using lock-based checking protocol for efficient data broadc...

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international conference on Distributed Computing systems Workshop

作者： A.C.S. Wong Kwok-Wa Lam K.K.M. Ho V.C.S. Lee Department of Computer Science City University of Hong Kong Hong Kong China

We address, the issue of reading the entire database by the broadcast transaction for data broadcasting in mobile environments. the broadcast transaction is a long-lived read-only transaction which creates significant amount of data conflicts with other concurrent update transactions. Using conventional concurrency control to handle the broadcast transaction is inadequate. Recently, some algorithms are proposed for reading the entire database. However, they suffer from late detection of data conflicts. this leads to many data entities being locked unnecessarily, reducing the availability of data. To solve this problem, an effective protocol based on a data locking approach is devised. Data conflicts can be detected at the early stage of the execution of update transactions by a set of predefined rules. As a result, the lock holding time of data entities is effectively reduced and unnecessary acquisitions of data locks are avoided. the simulation results show that the system performance can be significantly improved.

关键词： Protocols Broadcasting Transaction databases Concurrency control Testing Mobile computing System performance computer science Bandwidth Councils

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AODV routing protocol implementation design

AODV routing protocol implementation design

引用

international conference on Distributed Computing systems Workshop

作者： I.D. Chakeres E.M. Belding-Royer Department of Electrical & Computer Engineering University of California Santa Barbara USA Department of Computer Science University of California Santa Barbara USA

To date, the majority of ad hoc routing protocol research has been done using simulation only. One of the most motivating reasons to use simulation is the difficulty of creating a real implementation. In a simulator, the code is contained within a single logical component, which is clearly defined and accessible. On the other hand, creating an implementation requires use of a system with many components, including many that have little or no documentation. the implementation developer must understand not only the routing protocol, but all the system components and their complex interactions. Further, since ad hoc routing protocols are significantly different from traditional routing protocols, a new set of features must be introduced to support the routing protocol. In this paper we describe the event triggers required for AODV operation, the design possibilities and the decisions for our ad hoc on-demand distance vector (AODV) routing protocol implementation, AODV-UCSB. this paper is meant to aid researchers in developing their own on-demand ad hoc routing protocols and assist users in determining the implementation design that best fits their needs.

关键词： Routing protocols Computational modeling Operating systems computer science computer simulation Documentation Mobile ad hoc networks Logic testing Performance evaluation control system synthesis

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iPass: an incentive compatible auction scheme to enable packet forwarding service in MANET

iPass: an incentive compatible auction scheme to enable pack...

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international conference on Distributed Computing systems

作者： K. Chen K. Nahrstedt Computer Science Department University of Illinois at Urbana-Champaign Urbana Illinois U.S.A.

In a public mobile ad hoc network (MANET), users may be selfish and refuse to forward packets for other users. therefore, an incentive mechanism must be in place. We adopt the "pay for service" model of cooperation, and propose an auction-based incentive scheme (called iPass) to enable cooperative packet forwarding behavior in MANET. Each flow pays the market price of packet forwarding service to the intermediate routers. the resource allocation mechanism in our scheme is based on the generalized Vickrey auction with reserve pricing. We prove that in our scheme, user's truthful bidding of utility remains a dominant strategy, users and routers have incentive to participate in the scheme, and packet forwarding always leads to higher social welfare for the whole network. We design a signaling protocol to implement the scheme, and show that it can serve as an explicit rate-based flow control mechanism for the network. therefore, iPass is a joint solution of incentive engineering and flow control in a noncooperative MANET. Simulation results show that iPass is able to determine the auction outcome quickly, and at the same time achieve the goals of flow control.

关键词： Mobile ad hoc networks Bandwidth Incentive schemes Military computing Humans Intelligent networks computer science Waste materials Forward contracts Resource management

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A feasible region for meeting aperiodic end-to-end deadlines in resource pipelines

A feasible region for meeting aperiodic end-to-end deadlines...

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international conference on Distributed Computing systems

作者： T. Abdelzaher G. thaker P. Lardieri Department of Computer Science University of Virginia Charlottesville VA USA Advanced Technology Laboratories Inc. Cherry Hill NJ USA

this paper generalizes the notion of utilization bounds for schedulability of aperiodic tasks to the case of distributed resource systems. In the basic model, aperiodically arriving tasks are processed by multiple stages of a resource pipeline within end-to-end deadlines. the authors consider a multidimensional space in which each dimension represents the instantaneous utilization of a single stage. A feasible region is derived in this space such that all tasks meet their deadlines as long as pipeline resource consumption remains within the feasible region. the feasible region is a multidimensional extension of the single-resource utilization bound giving rise to a bounding surface in the utilization space rather than a scalar bound. Extensions of the analysis are provided to nonindependent tasks and arbitrary task graphs. We evaluate the performance of admission control using simulation, as well as demonstrate the applicability of these results to task schedulability analysis in the total ship computing environment envisioned by the US navy.

关键词： Pipelines Processor scheduling Military computing Admission control Marine vehicles Real time systems Distributed computing Resource management Aerospace electronics Jitter

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Incorporating timeliness in atomic write of shared data for distributed embedded systems

Incorporating timeliness in atomic write of shared data for ...

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international conference on Distributed Computing systems Workshop

作者： K. Ravindran A. Sabbir K.A. Kwiat Department of Computer Science City University of New York New York NY USA Information Directorate Air Force Research Laboratory Rome NY USA

In a distributed embedded system, data items may be moved from one set of functional modules to another through a common buffer that is interposed between them over a network. Here, the computation modules disseminating data should agree on what data items are written into the remote buffer, to coordinate their actions on the external environment. Furthermore, a timely effect of these actions requires enforcing deadlines on the processing of data from the remote buffer. To meet these requirements, we need a programming structure that enables a consistent view of the processing on data in the buffer by various computation modules over prescribed time intervals. Our structure allows an explicit application-level control of the asynchrony and timing of information flow between various modules. Its use is illustrated with a case study of a battlefield 'data fusion' application.

关键词： Embedded system Distributed computing conferences

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A new QoS point coordination function for multimedia wireless LANs

A new QoS point coordination function for multimedia wireles...

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international conference on Distributed Computing systems

作者： Zi-Tsan Chou Shih-Lin Wu Institute for Information Industry Taipei Taiwan Department of Computer Science and Information Engineering Chang Gung University Taoyuan Taiwan

We propose a new MAC protocol, named Q-PCF (quality-of-service PCF), which provides QoS guarantees to real-time multimedia applications for WLANs. Specifically, Q-PCF has the following attractive features. First, it supports multiple priority levels and guarantees that high-priority stations always join the polling list earlier than low-priority stations. Second, it provides fast reservation scheme such that real-time stations can get on the polling list in bounded time. third, it employs dynamic bandwidth allocation scheme to support CBR/VBR transportation and provide per-flow probabilistic performance assurances. Forth, it adopts the novel mobile-assisted admission control technique such that the access point can admit as many newly flows as possible, while not violating admitted flows' guarantees. Simulation results do confirm that Q-PCF achieves high goodput and low frame delay dropped rate. Last but not least, we believe that the Q-PCF protocol can be easily applied to the current IEEE 802.11 products without major modifications.

关键词： Wireless LAN Local area networks Delay Bandwidth computer industry computer science Media Access Protocol Quality of service Application software Channel allocation

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Roaming honeypots for mitigating service-level denial-of-service attacks

Roaming honeypots for mitigating service-level denial-of-ser...

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international conference on Distributed Computing systems

作者： S.M. Khattab C. Sangpachatanaruk D. Mosse R. Melhem T. Znati Department of Computer Science University of Pittsburgh PA USA Department of Information Science and Telecommunications University of Pittsburgh PA USA

Honeypots have been proposed to act as traps for malicious attackers. However, because of their deployment at fixed (thus detectable) locations and on machines other than the ones they are supposed to protect, honeypots can be avoided by sophisticated attacks. We propose roaming honeypots, a mechanism that allows the locations of honeypots to be unpredictable, continuously changing, and disguised within a server pool. A (continuously changing) subset of the servers is active and providing service, while the rest of the server pool is idle and acting as honeypots. We utilize our roaming honeypots scheme to mitigate the effects of service-level DoS attacks, in which many attack machines acquire service from a victim server at a high rate, against back-end servers of private services. the roaming honeypots scheme detects and filters attack traffic from outside a firewall (external attacks), and also mitigates attacks from behind a firewall (internal attacks) by dropping all connections when a server switches from acting as a honeypot into being active. through ns-2 simulations, we show the effectiveness of our roaming honeypots scheme. In particular, against external attacks, our roaming honeypots scheme provides service response time that is independent of attack load for a fixed number of attack machines.

关键词： computer crime Network servers Protection Web server Telecommunication traffic Intrusion detection computer science Information science Filters Traffic control

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Trust- and clustering-based authentication services in mobile ad hoc networks

Trust- and clustering-based authentication services in mobil...

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international conference on Distributed Computing systems Workshop

作者： E.C.H. Ngai M.R. Lyu Department of Computer Science and Engineering Chinese University of Hong Kong Sha Tin Hong Kong China

A mobile ad hoc network is a kind of wireless communication network that does not rely on a fixed infrastructure and is lack of any centralized control. these characteristics make it vulnerable to security attack, so protecting the security of the network is essential. Like many distributed systems, security in ad hoc networks widely relies on the use of key management mechanisms. However, traditional key management systems are not appropriate for them. We aim at providing a secure and distributed authentication service in ad hoc networks. We propose a secure public key authentication service based on our trust model and network model to prevent nodes from obtaining false public keys of the others when there are malicious nodes in the network. We perform an overall evaluation of our proposed approach by simulations. the experimental results indicate clear advantages of our approach in providing effective security in mobile ad hoc networks.

关键词： Authentication Intelligent networks Mobile ad hoc networks Ad hoc networks Communication system security Public key Wireless communication Protection Privacy Network servers

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