To facilitate the mobile users on ships for communication effectively in the offshore areas at sea, this paper proposes an integrated wireless networking system that is composed of mobile ad hoc network, cellular mobi...
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作者：
Ong, D.Khaddaj, S.Faculty of Computing
Information Systems and Mathematics Kingston University London Kingston Upon Thames Surrey KT1 2EE United Kingdom
the continuous decentralisation and distribution of software, hardware, and human resources depends on a number of fundamental factors including the ability to provide desired Quality of Service (QoS) on resources ass...
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Consider mobile targets moving in a plane and their movements being monitored by a network such as a field of sensors. We develop distributed algorithms for in-network tracking and range queries for aggregated data (f...
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ISBN:
(纸本)9781450301824
Consider mobile targets moving in a plane and their movements being monitored by a network such as a field of sensors. We develop distributed algorithms for in-network tracking and range queries for aggregated data (for example returning the number of targets within any user given region). Our scheme stores the target detection information locally in the network, and answers a query by examining the perimeter of the given range. the cost of updating data about mobile targets is proportional to the target displacement. the key insight is to maintain in the sensor network a function with respect to the target detection data on the graph edges that is a differential one-form such that the integral of this one-form along any closed curve C gives the integral within the region bounded by C. the differential one-form has great flexibility making it appropriate for tracking mobile targets. the basic range query can be used to find a nearby target or any given identifiable target with cost O(d) where d is the distance to the target in question. Dynamic insertion, deletion, coverage holes and mobility of sensor nodes can be handled with only local operations, making the scheme suitable for a highly dynamic network. It is extremely robust and capable of tolerating errors in sensing and target localization. Due to limited space, we only elaborate the advantages of differential forms in tracking of mobile targets. the same routine can be applied for organizing many other types of informations, for example streaming scalar sensor data (such as temperature data field), to support efficient range queries. We demonstrate through analysis and simulations that this scheme compares favorably with existing schemes that use location services for answering aggregated range queries of target detection data.
Previous work on the use of the Teleo-Reactive technique in high level software development has shown it to be a viable approach for autonomic systems. A T-R program can recover from unexpected events without knowing ...
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this paper Presents a distributed Grid-Density based Satellite data Clustering technique, DisClus(1), which can detect clusters of arbitrary shapes and sizes over high resolution, multi-spectral satellite datasets. Qu...
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ISBN:
(纸本)9783642113215
this paper Presents a distributed Grid-Density based Satellite data Clustering technique, DisClus(1), which can detect clusters of arbitrary shapes and sizes over high resolution, multi-spectral satellite datasets. Quality of the clusters is further enhanced by incorporating a partitioning based method for the reassignment of the border pixels to the most relevant;clusters. Experimental results are presented to establish the superiority of the technique in terms of scale-up, speedup as well as cluster quality.
A new paradigm to design computer systems called evolving reconfigurable architecture (ERA) is proposed. Several holistic principles are introduced and pursued through the ERA design cycle. We show how reconfigurabili...
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We develop an online optimisation framework for self tuning of computer systems. Towards this, we first discuss suitable objective functions. We then develop an iterative technique that is robust to noisy measurements...
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ISBN:
(纸本)9783642113215
We develop an online optimisation framework for self tuning of computer systems. Towards this, we first discuss suitable objective functions. We then develop an iterative technique that is robust to noisy measurements of objective function and also requires fewer perturbations on the configuration. We essentially adapt the Nelder-Mead algorithm to work with constrained variables and also allow noisy measurements. Extensive experimental results on a queueing model and on an actual system illustrate the performance of our scheme.
Next-generation computation-intensive applications in various science and engineering fields feature large-scale computing workflows. Supporting such computing workflows and optimizing their network performance in ter...
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ISBN:
(纸本)9783642113215
Next-generation computation-intensive applications in various science and engineering fields feature large-scale computing workflows. Supporting such computing workflows and optimizing their network performance in terms of end-to-end delay or frame rate in heterogeneous network environments are critical to the success of these distributed applications that require fast response time or smooth data flow. We formulate six linear pipeline configuration problems with different mapping objectives and network constraints, and one general workflow mapping problem. We investigate the computational complexity of these problems and design optimal or heuristic algorithms with rigorous correctness proof and performance analysis. An extensive set of optimization experiments on a large number of simulated workflows and networks illustrate the superior performance of the proposed algorithms in comparison withthat of existing methods.
Social networks such as Facebook and Secondlife are popular. Wireless devices abound from affluent countries to developing countries. Social networks need wide area Internet support. Wireless interfaces offer ad hoc n...
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ISBN:
(纸本)9783642113215
Social networks such as Facebook and Secondlife are popular. Wireless devices abound from affluent countries to developing countries. Social networks need wide area Internet support. Wireless interfaces offer ad hoc networking capability, without the need for infrastructure support. Web on Demand (WoD) aims to bridge the gap between ad hoc social networks (people in close proximity with shared interests) and ad hoc networking. A key requirement for WoD is transparent connection management. this paper makes three contributions: First, an abstraction called VirtualConnection for transparent connection creation and migration, with socket-like API;second, an implementation on iPAQs (Windows Mobile) as a user level library, and proof of efficacy of using this abstraction for realizing WoD;third, evaluations to establish the performance of this abstraction. In particular, we show the performance degradation due to virtualizing the connection is negligible.
In Internet applications, Web object prefetching is a commonly used and quite effective algorithmic approach to reduce user perceived delays. While a separate concept, prefetching is closely related to caching and the...
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