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For many complex combinatorial optimization problems, obtaining good solutions quickly is of value either by itself or as part of an exact algorithm. Greedy algorithms to obtain such solutions are known for many problems. In this paper we present stochastic greedy algorithms which are perturbed versions of standard greedy algorithms, and report on experiments using learned and standard probability...
Successful rescue operations after big accidents or natural disasters require a fast and efficient overview of the overall situation. With recent advances, unmanned aerial vehicles (UAVs) are more and more a viable choice under such circumstances.With the number of employed UAVs, the problem of coordination arises as well as proper task allocation among possibly heterogeneous UAVs. This paper presents...
Context aware systems use context information to adapt their behaviour accordingly. In order to derive high level context information from low level context, such as sensor values, context reasoning methods that correlate observable context information, are necessary. Several context reasoning mechanisms have been proposed in the literature. Usually these mechanisms are centralized, leading to suboptimal...
This paper presents a middleware that aims to respond to the increasing management needs of networked sensing devices, such as remote software deployment, dynamic configuration and real-time performance monitoring and tuning. These are essential functions for building adaptable systems providing high quality of service. Furthermore, autonomic management bears particular importance for large scale...
With the increasing prevalence of large scale cloud computing environment, researchers has draw more attention about how to provide software as a service through the internet. In this paper, a novel approach named vSaaS is proposed in iVIC platform, which is the virtual computing environment for HaaS and SaaS applications. The aim of this approach is to provide the software as a service from a cloud...
This paper advocates for the introduction of performance awareness in autonomic systems. The motivation is to be able to predict the performance of a target configuration when a self-* feature is planning a system reconfiguration.We propose a global and partially automated process based on queues and queuing networks models. This process includes decomposing a distributed application into black boxes,...
This paper presents a model for the interaction between context-aware virtual agents and the environment in which they are situated. This model applies to multiagent based simulation systems dealing with human-like virtual agents in decentralized, continuous, and dynamic environments. The model supports an extensible agent perception module, allowing agents to perceive their environment through multiple...
This paper proposes an autonomous energy saving method that works on wireless sensor networks. Wireless sensor nodes are equipment for gathering information about the user's surrounding environment. An energy-efficient data gathering system is required because each node is battery powered. Our method autonomously reduces the sampling frequency for monitoring environments whose condition may vary rapidly...
The interaction between every service provider and its users is regulated by the service level agreement and customer satisfaction feedback. The former is the basis for the technical audit, while the latter subjectively validates the user perception. To accurately evaluate the feedback after service/product consumption, we will refine the user profile by considering the dynamics of the feedback. The...
Robustness and reliability are more important for future applications than today. This is outlined in this paper. The suitability of the spread-spectrum technology for future wireless applications is investigated. The spread-spectrum technology offers the RAKE receiver structure to mitigate the most harmful type of interference in a mobile application, the multipath interference. To enhance the spectral...
Although highly promising to meet the challenges of pervasive network security, self-managed protection has been little addressed in this setting. This paper adopts a policy-based management approach to the problem, and presents a policy-driven security framework called ASPF. Enforced authorization policies in a device are adapted according to the security context, both at the network and device levels...
Virtualization has become an essential technology in the data center. Virtualization improves resource utilization through server consolidation, but it also makes resource management more complex. Golondrina, an autonomic resource management system, was built to use virtual machine relocation to handle resource stress situations, that is, situations where the combined resource needs of the virtual...
Combined transport of commercial vehicles by trains is in operation between designated endpoint railway terminals on several subcontinents, e.g. Western Europe, United States and India. Up to now this requires that drivers accompany their commercial vehicles in a separate passenger car which makes this form of transport uncomfortable, inflexible and costly, resulting in that trucks on trains constitute...
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