this paper discusses the design and implementation details of MAST (Mobile Agent-based Security Tool), a new mobile agent-based network security approach. MAST has been designed to support flexible and customizable ne...
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ISBN:
(纸本)9781581138122
this paper discusses the design and implementation details of MAST (Mobile Agent-based Security Tool), a new mobile agent-based network security approach. MAST has been designed to support flexible and customizable network security tasks and training. this paper focuses on the implementation details and security aspects of MAST's components, services, and mobile-agent architecture.
Advances in spatially enabled semantic computing can provide situation aware assistance for mobile users. this intelligent and context-aware technology presents the right information at the right time, place and situa...
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ISBN:
(纸本)9781581138122
Advances in spatially enabled semantic computing can provide situation aware assistance for mobile users. this intelligent and context-aware technology presents the right information at the right time, place and situation by exploiting semantically referenced data for knowledge discovery. the system takes advantage of new metadata standards to enable semantic, user, and device adapted transactions on multimedia datasets. Information accessed in the past and the activities planned by the user, the situation dependencies (e.g. location) of these activities are used to infer future information requirements. the focus of this paper describes an application of the above functionalities for performing mobile context-aware queries and updating of a multimedia spatial database of cultural heritage artifacts concerning early 20th century Dublin. It aims to exploit current consumer trends in mobile device usage by opening new markets for the increasing number of visitors to Dublin's streets. An on-going development of this technology, the project MoCHA (Mobile Cultural Heritage Adventures), will allow the mobile cultural heritage consumer to explore a personally tailored view of Dublin's treasured artefacts, historical events and districts in an interactive and intuitive way directly on their spatially enabled PDA.
Biological literature databases continue to grow rapidly with vital information that is important for conducting sound biomedical research. As data and information space continue to grow exponentially, the need for ra...
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Biological literature databases continue to grow rapidly with vital information that is important for conducting sound biomedical research. As data and information space continue to grow exponentially, the need for rapidly surveying the published literature, synthesizing, and discovering the embedded "knowledge" is becoming critical to allow the researchers to conduct "informed" work, avoid repetition, and generate new hypotheses. Knowledge, in this case, is defined as one-to-many and many-to-many relationships among biological entities such as gene, protein, drug, disease, etc. the knowledge discovery process basically involves identification of biological object names, reference resolution, ontology and synonym discovery, and finally extracting object-object relationships. the overall goal of this work is to investigate and develop a complete knowledge base, called BioMap, using the entire MEDLINE collection of (over 12 million) bibliographic citations and author abstracts from over 4600 biomedical journals worldwide and to develop an interactive knowledge network for users to access this secondary knowledge (BioMap) along with its primary databases such as the MEDLINE. In this paper we present the organization of a distributed database system to maintain the knowledge base of BioMap and some preliminary results on biological object name identification problem based on an initial set of 30,000 MEDLINE abstracts.
the proceedings contain 195 papers from the 18th Annual symposium on appliedcomputing. the topics discussed include: implementing fuzzy expert system for intelligent buildings;image texture classification using datag...
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the proceedings contain 195 papers from the 18th Annual symposium on appliedcomputing. the topics discussed include: implementing fuzzy expert system for intelligent buildings;image texture classification using datagrams and characteristics views;enabling mobile agents to dynamically assume roles;automatic parallelism in differentiation of Fourier transforms and long time step molecular dynamics using targeted Langevin stabilization.
Adaptive query processing in large distributed systems has seen increasing importance due to the rising environmental fluctuations in a growing Internet. We describe Ginga, an adaptive query processing engine that com...
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ISBN:
(纸本)9781581136241
Adaptive query processing in large distributed systems has seen increasing importance due to the rising environmental fluctuations in a growing Internet. We describe Ginga, an adaptive query processing engine that combines proactive (compile-time) alternative query plan generation with reactive (run-time) monitoring of network delays. the core of Ginga approach is the notion of adaptation space and mechanisms for coordinating and integrating different kinds of query adaptation. An adaptation space consists of a set of adaptation triggers and a set of adaptation cases associated withthe triggers, Each adaptation case describes a specific adaptation opportunity of the query execution when changes to the runtime environment are detected. Our experimental results show that Ginga query adaptation can achieve significant performance improvements (up to 40% of response time gain) for processing distributed queries over the Internet.
To improve the performance of mobile computers, a number of broadcast based cache invalidation schemes have been proposed in the past to support object locality. However most of these schemes have focused on providing...
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ISBN:
(纸本)9781581136241
To improve the performance of mobile computers, a number of broadcast based cache invalidation schemes have been proposed in the past to support object locality. However most of these schemes have focused on providing support for client disconnection and reducing query delay. the size of invalidation reports and the effect of invalidating items cached by many clients are also important issues that must be addressed in order to provide cost-efficient cache invalidation in a mobile environment. In this paper, we propose two techniques, Validation-Invalidation Reports (VIR) and the Delayed Requests Scheme (DRS) to address these issues. VIR uses a combination of validation and invalidation reports, allowing the server to construct and broadcast smaller reports at each interval, thus improving downlink channel utilization. DRS addresses the problem where multiple clients request for the same data items. It introduces a "cool down" period after an invalidation, to reduce the number of uplink requests sent by clients. Simulation results show that compared to the original TS approach [1], the proposed schemes lower transmission cost associated with cache invalidation by between 5%-25% in the downlink channel and between 10%-40% in the uplink channel.
this talk presents three-dimensional numerical simulations of oceanic trade cumulus clouds underlying stratocumulus clouds. they use a case studied in a Global Energy and Water Experiment Cloud System Study (GCSS) mod...
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ISBN:
(纸本)9781581136241
this talk presents three-dimensional numerical simulations of oceanic trade cumulus clouds underlying stratocumulus clouds. they use a case studied in a Global Energy and Water Experiment Cloud System Study (GCSS) model intercomparison that is loosely based on observed conditions during the Atlantic Trade Cumulus Experiment (ATEX). this case study is motivated by the importance of this cloud type to global cloud radiative forcing, and their role as a feeder system for deep convection in the tropics. this study focuses on the sensitivity of the modeled cloud field to the domain size and the grid spacing. Domain widths from 6.5 to 20 kilometers and horizontal grid spacings ranging from 10 to 80 meters, with corresponding vertical grid spacing ranging from 5 to 40 m, are studied, involving domains with over 1000 gridpoints in each horizontal dimension. the combination of large domain size and small grid resolution (up to 2.5 billion grid-cells) provides an unprecedented perspective on this type of convection. this is in contrast to prior LES simulations which have often used domains a few kilometers wide. the larger domain size considered here is comparable to the grid resolution of a typical current mesoscale model (a similar resolution will soon be achieved in some global weather forecast models), and can better represent the potential horizontal variability achievable within a mesoscale grid cell. these simulations are made possible by massively parallel computations using 1.3 terabytes of memory and over 1000 processors.
this paper describes a new fault-tolerant routing algorithm for the k-ary n-cube using the concept of "probability vectors". To compute these vectors, a node determines first its faulty set, which contains a...
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ISBN:
(纸本)9781581134452
this paper describes a new fault-tolerant routing algorithm for the k-ary n-cube using the concept of "probability vectors". To compute these vectors, a node determines first its faulty set, which contains all its neighbouring nodes that are faulty or unreachable due to faulty nodes or links. Each node then calculates a probability vector, where the i-th element represents the probability that a destination node at distance i cannot be reached using a minimal path due to a faulty node or link. the probability vectors are used by all the nodes to achieve an efficient fault-tolerant routing in the network. Results from a performance analysis presented below show that the new algorithm exhibits good fault-tolerance properties in terms of the achieved percentage of reachability and routing distances.
the paper describes an experience in developing and using a system for real-time field support to archaeological excavations. the experience is made possible by using mobile computers in outdoor environments, like arc...
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ISBN:
(纸本)1581130864
the paper describes an experience in developing and using a system for real-time field support to archaeological excavations. the experience is made possible by using mobile computers in outdoor environments, like archaeological sites.
the HiMAT model is introduced for the design and development of mobile agent applications. HiMAT derives from two models for mobile agents, MA and TuCSoN. By extending and integrating these two models, HiMAT provides ...
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ISBN:
(纸本)1581130864
the HiMAT model is introduced for the design and development of mobile agent applications. HiMAT derives from two models for mobile agents, MA and TuCSoN. By extending and integrating these two models, HiMAT provides a unique, coherent framework enabling mobile agent system designers to effectively deal with topology, authentication, authorization and coordination.
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