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Multi-channel multi-radio wireless networks improve network performance by enabling more simultaneous transmissions. Among multi-channel multi-radio protocols, the hybrid multi-channel approach has been shown to be efficient in providing higher system throughput. Voice over internet protocol (VoIP) service is expected to be widely supported in wireless networks, though its capacity has not been studied...
In this paper we discuss the viability of utility-based abstractions for network management. These can be used for estimation and optimization of the network performance. We consider utilities that are determined by the application type, but also take into account changing user and provider context. These metrics incorporate technical performance characteristics, economic and personal considerations...
Packet dropping policies in delay tolerant network are mostly ignored during the years. However, it is shown that the traditional packet dropping policies can not work well in the DTN environment. In this paper we analyze the performance of the traditional packet dropping policies and proposed a new policy which drops packet according to its weight. Packet's weight is calculated using historical information...
The economiser is a critical component for efficient operation of coal-fired power stations. It consists of a large system of water-filled tubes which extract heat from the exhaust gases. When it fails, usually due to erosion causing a leak, the entire generator unit must be shut down to effect repairs. Not only are such repairs highly expensive, but the overall repair costs are significantly affected...
In this paper, we consider the problem of physical topology design (i.e., physical connectivity) for Internet backbone networks. We explore the driving forces for service providers to layout fiber links, and propose a new problem formulation that can accurately emulate the existing optical backbone networks. Unlike previous studies which mainly focused on deployment cost, our model captures the physical...
Good point set scanning-based self-learning worms can reach a stupendous propagation speed in virtue of the non-uniform vulnerable-host distribution than that of traditional worms. In order to combat self-learning worms, this paper proposes an interaction model. Using the interaction model, we obtain the basic reproduction number. The impact of different parameters of predators is studied. Simulation...
Flight delay is the root of Delay Propagation, while delay propagated within a Flight Chain. Busy hub-airport plays an important role in a Flight Chain, since the Initial Delay often happens there. To research more possible impacting factors in the Flight Chain, a busy hub-airport is chosen as the object in this research. After analyzing the complex and uncertain relationship between flight delays...
There are much collaboration and cooperation in the dynamic, multi-institutional virtual grid. Grid provides a good bridge between the resource users and the resource providers. Especially in the agent-based grid system, agents could provide services for the scheduling of applications that make grid resources better use. We have proposed a resource discovery mechanism with negotiation in grid environment...
Railway scheduling has been a significant issue in the railway industry. Over the last few years, numerous approaches and tools have been developed to compute railway scheduling. However, robust solutions are necessary to absorb short disruptions. In this paper, we present the robustness problem from the point of view of railway operators and we give some guidelines to measure robustness in timetabling...
Many mobile computing models try to solve many issues related to the mobile computing such as: mobile movement, data synchronization, embedded databases, data privacy and confidentiality, P2P dissemination models, middleware adaptability, and mobile transactions. In this paper we will focus on the last area which is the mobile transactions and a new model (The diagonal allocation grid and fixed timeout...
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