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On-line realignment of clients in networked databases

On-line realignment of clients in networked databases

引用

international conference on distributed computing Systems

作者： Je-Ho Park A. Delis Department of Computer and Information Science Polytechnic University Brooklyn NY USA

ISBN: (纸本)0769510779

Upper bounds on the scalability of client-server databases (CSDs) persist due to long delays experienced at the servers' queues. To this end, we have proposed a three-tier architecture that exploits similarities in object access behavior demonstrated by clients. Clients are statically grouped into logical clusters and object requests can be then served in an "internal to cluster" fashion. This is achieved with the introduction of an intermediate directory tier. Good client clustering yields more scalable CSD configurations as it minimizes the number of inter-cluster data accesses. We introduce the problem of client realignment in light of changing client localities and propose an online reclustering framework to address it. Online reclustering facilitates adaptive reconfiguration and redistribution of sites. The core of our proposal is a change detection approach that uses meta-data extracted from observed clients' access patterns. We evaluate the impact of employing a multi-featured change detection scheme in the three-tier CSD architecture and experimentally investigate its performance and trade-offs involved.

关键词： intelligent networks Databases Upper bound Scalability Delay Information science Computer architecture Proposals Data mining Network servers

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Adaptive approaches to relieving broadcast storms in a wireless multihop mobile ad hoc network

Adaptive approaches to relieving broadcast storms in a wirel...

引用

international conference on distributed computing Systems

作者： Yu-Chee Tseng Sze-Yao Ni En-Yu Shih Department of Computer Science and Information Engineering National Chiao Tung University Hsinchu Taiwan Department of Computer Science and Information Engineering National Central University Chungli Taiwan

ISBN: (纸本)0769510779

In a multihop mobile ad hoc network, broadcasting is an elementary operation to support many applications. In (Ni et al., 1999), it is shown that naively broadcasting by flooding may cause serious redundancy, contention, and collision in the network, which we refer to as the broadcast storm problem. Several threshold-based schemes are shown to perform better than flooding in (Ni et al., 1999). However, how to choose thresholds also poses a dilemma between reachability and efficiency under different host densities. We propose several adaptive schemes, which can dynamically adjust thresholds based on local connectivity information. Simulation results show that these adaptive schemes can offer better reachability as well as efficiency as compared to the results in (Ni et al., 1999).

关键词： Broadcasting storms intelligent networks Spread spectrum communication Mobile ad hoc networks Computer science Mobile communication Relays Routing Delay

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Shared state consistency for time-sensitive distributed applications

Shared state consistency for time-sensitive distributed appl...

引用

international conference on distributed computing Systems

作者： V. Krishnaswamy M. Ahamad M. Raynal D. Bakken Georgia Institute of Technology Atlanta GA USA IRISA/University of Rennes 1 Rennes France Washington State University Pullman WA USA

ISBN: (纸本)0769510779

distributed applications that share a dynamically changing state are increasingly being deployed in wide-area environments. Such applications must access the state in a consistent manner, but the consistency requirements vary significantly from other systems. For example, shared memory models, such as sequential consistency, focus on the ordering of operations, and the same level of consistency is provided to each process. In interactive distributed applications, the timeliness of updates becoming effective could be an extremely important consistency requirement, and it could be different across different users. We propose a system that provides both non-timed and time-sensitive read and write operations for dynamic shared state. For example, a timed read can be used by a process to read a recently written value, whereas a timed write can make a new value available to all readers within a certain amount of time. We develop a consistency model that precisely defines the semantics of timed and non-tinted read and write operations. A protocol that implements this model is also presented. We also describe an implementation and some performance measurements.

关键词： Protocols Application software Home computing Pervasive computing Delay effects

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Towards forming communities using wearable musical instruments

Towards forming communities using wearable musical instrumen...

引用

international conference on distributed computing Systems Workshop

作者： Y. Tada K. Nishimoto T. Maekawa R. Rouve K. Mase R. Nakatsu ATR Media Integration and Communications Research Laboratories Japan PRESTO Japan Science and Technology Corporation Japan Japan Advanced Institute of Science and Technology Hokuriku Japan

ISBN: (纸本)0769510809

We describe the design and applications of Costune (costume+tune), which is a novel wearable musical instrument. A Costune is not only a personal wearable musical instrument but also is equipped with wireless communications functions to communicate with other Costunes. A prototype system is also described. Music is a powerful communications medium, therefore, we designed Costune as a communications tool. Costune users can make collaborative compositions and perform ad hoc sessions with others who share similar musical tastes. Thus, Costune may foster a novel musical culture as well as support the formation of communities mediated by music.

关键词： Instruments Wireless communication Prototypes Vehicles Network servers Collaboration Wireless networks Music Acoustic scattering Skeleton

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Anonymous Gossip: improving multicast reliability in mobile ad-hoc networks

Anonymous Gossip: improving multicast reliability in mobile ...

引用

international conference on distributed computing Systems

作者： R. Chandra V. Ramasubramanian K. Birman Department of Computer Science Cornell University Ithaca NY USA

ISBN: (纸本)0769510779

In recent years, a number of applications of ad-hoc networks have been proposed. Many of them are based on the availability of a robust and reliable multicast protocol. We address the issue of reliability and propose a scalable method to improve packet delivery of multicast routing protocols and decrease the variation in the number of packets received by different nodes. The proposed protocol works in two phases. In the first phase, any suitable protocol is used to multicast a message to the group, while in the second concurrent phase, the gossip protocol tries to recover lost messages. Our proposed gossip protocol is called Anonymous Gossip (AG) since nodes need not know the other group members for gossip to be successful. This is extremely desirable for mobile nodes, that have limited resources, and where the knowledge of group membership is difficult to obtain. As a first step, anonymous gossip is implemented over MAODV without much overhead and its performance is studied. Simulations show that the packet delivery of MAODV is significantly improved and the variation in number of packets delivered is decreased.

关键词： intelligent networks Ad hoc networks Multicast protocols Peer to peer computing Routing protocols Computer network reliability Computer science Application software Availability Robustness

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Generalized role-based access control

Generalized role-based access control

引用

international conference on distributed computing Systems

作者： M.J. Moyer M. Abamad College of Computing Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0769510779

Generalized Role-Based Access Control (GRBAC) is a new paradigm for creating and maintaining rich access control policies. GRBAC leverages and extends the power of traditional role based access control (RBAC) by incorporating subject roles, object roles and environment roles into access control decisions. Subject roles are like traditional RBAC roles: they abstract the security-relevant characteristics of subjects into categories that can be used in defining a security policy. Similarly, object roles abstract the various properties of objects, such as object type (e.g., text, JPEG, executable) or sensitivity level (e.g., classified, top secret) into categories. Environment roles capture environmental information, such as time of day or system load so it can be used to mediate access control. Together, these three types of roles offer flexibility and expressive power, as well as a degree of usability not found in current access control models.

关键词： Access control Educational institutions Information security Power system security Usability Power system modeling Mechanical factors Permission

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Developing and refining an adaptive token-passing strategy

Developing and refining an adaptive token-passing strategy

引用

international conference on distributed computing Systems

作者： B. Englert L. Rudolph A. Shvartsman Department of Mathematics University of California Los Angeles Los Angeles CA USA Laboratory for ComputerScience Massachusetts Institute of Technology Cambridge MA USA Computer Science and Eng. University of Connecticut Storrs CT USA

ISBN: (纸本)0769510779

Token rotation algorithms play an important role in distributed computing, to support such activities as mutual exclusion, round-robin scheduling, group membership and group communication protocols. Ring-based protocols maximize throughput in busy systems but can incur a linear (in the number of processors) delay when a processor needs to obtain a token to perform an operation. This paper synthesizes new algorithmic techniques for improving the performance (responsiveness) of logical ring protocols. The parameterized technique presents the safety properties of ring protocols and maintains high throughput in busy systems, while reducing the delay in lightly loaded systems from a linear to a logarithmic function in the number of processors. The development in this paper is done using term rewriting systems, where our parameterized protocol is developed in a series of safety-preserving refinements of a basic specification.

关键词： Delay Throughput Safety Round robin Computer science Access protocols Scheduling algorithm Processor scheduling Ear Design optimization

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Agents and mobile handsets

Agents and mobile handsets

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international conference on distributed computing Systems Workshop

作者： M. Mahan Nokia Research Center Finland

ISBN: (纸本)0769510809

Given the mobile phone's high market penetration and strong upgrade rate, it suggests itself as a natural candidate to support, and eventually host a user's digital representative. Coupled with artificial intelligence techniques, a phone-borne digital representative takes the form of a mobile assistant. Mobile assistants can circumvent hardware constraints (CPU cycles, narrow or expensive bandwidth, small memory, and limited user interface). They can also enable a set of new services that draw on the user's personal preferences, the user's location, available services, and the mobile phone's support of short-range connectivity. Although mutually independent, both capabilities, taken together, yield a powerful, digital representation of the mobile user. This digital representation can provide an optimal user experience, i.e., maximal connection to relevant services, without information overload or expensive wireless service charges. The article addresses three topics: the emergent mobile computing environment; the characteristics of mobile assistants that enable them to operate in this environment; and proposed mobile assistant architectures which target both current and future mobile phones.

关键词： Mobile handsets Space technology Telephone sets Hardware Bandwidth User interfaces Mobile computing Computer architecture Bluetooth Communications technology

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A dynamic customization model for distributed component-based systems

A dynamic customization model for distributed component-base...

引用

international conference on distributed computing Systems Workshop

作者： E. Truyen B. Vanhaute W. Joosen P. Verbaeten B.N. Jorgensen DistriNet Dept. Computer Science K.U. Leuven Leuven Belgium Maersk Institute for Production Technology Odense Campus Denmark

ISBN: (纸本)0769510809

Support for dynamic and client-specific customization of distributed services is required in many application areas. We present a distributed service as consisting of minimal functional core, implemented as a component based system, and an unbound set of potential extensions that can be selectively integrated within this core functionality. An extension to this core may be a new service, due to new requirements of end users. Another important category of extensions we consider are non-functional services such as authentication, which typically introduce interaction refinements at the application level. Each extension is implemented us a layer of decorator-like wrappers. The novelty of this work is that the composition logic, responsible for integrating extensions into the core system, is completely separated from the code of the core system, extensions and clients as well. Clients (end users, system integrators) can customize this composition logic dynamically on a per interaction basis by attaching extension identifiers to their interactions with the core system.

关键词： Collaboration Application software Object oriented modeling Logic Software architecture Computer science distributed control Production Large-scale systems Object oriented programming

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distributed network simulations using the dynamic simulation backplane

Distributed network simulations using the dynamic simulation...

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international conference on distributed computing Systems

作者： G.F. Riley M.H. Ammar R.M. Fujimoto Donghua Xu K. Perumalla College of Computing Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0769510779

Presents an approach for creating distributed, component-based simulations of communication networks by interconnecting models of sub-networks drawn from different network simulation packages. This approach supports the rapid construction of simulations for large networks by reusing existing models and software, and fast execution using parallel discrete event simulation techniques. A dynamic simulation backplane is proposed that provides a common format and protocol for message exchange, and services for transmitting data and synchronizing heterogeneous network simulation engines. In order to achieve plug-and-play interoperability, the backplane uses existing network communication standards and dynamically negotiates among the participant simulators to define a minimal subset of required information that each simulator must supply, as well as other optional information. The backplane then automatically creates a message format that can be understood by all participating simulators and dynamically creates the content of each message by using callbacks to the simulation engines. We describe our approach to interoperability as well as an implementation of the backplane. We present results that demonstrate the proper operation of the backplane by distributing a network simulation between two different simulation packages, ns2 and GloMoSim. Performance results show that the overhead for the creation of the dynamic messages is minimal. Although this work is specific to network simulations, we believe our methodology and approach can be used to achieve interoperability in other distributed computing applications as well.

关键词： Backplanes Discrete event simulation Protocols Computational modeling Packaging Engines distributed computing Contracts Educational institutions Computer networks

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