Research On Resource Management Mechanism In Open Network

With the development of computer network and communication technology, network environment has been changed from a closed network, which was comparatively static and particularly for special organizations or user groups, to an open one that can be publicly accessed and available for mass of dynamic users. Open network improves collaboration and resource sharing among entities in network. How to manage resources with the features of distributed, openness, dynamics, heterogeneity and autonomy effectively becomes one of the hot topics.Resource Management is the core component in open network. There are two major management difficulties here: one is how to fulfill functional requirements of network applications, i.e., resource management should implement the function of resource sharing, schedule various resources that user jobs demand, and therefore enhance the network's usability. The other is how to suffice the safety requirements of network applications, i.e., resource management should improve the defense against destroy from malevolent nodes, such as Sybil attack, and therefore enhance the network's reliability.Focusing on these two problems, this thesis carries out researches as follows:1. Analyze the research background, including the concept, features and applications of open network. Introduce two typical types of open network, Grid and P2P, and analyze the differences and connections between each other.2. Explain various aspects of the mechanism of resource management in open network, including resource characteristics, function and classification of resource management module, and the problems in functionality and the safety fields.3. In order to solve the QoS measurement problem when there are multiple performance objectives in grid task scheduling, a QoS measurement method is used, and a multi-QoS supported online scheduling algorithm is proposed. Experiments show that compared with traditional algorithm, this one can accommodate users and systems'requirements comprehensively, through sufficient considerations of users'multiple preferences.4. Based on the creditability of resources, a transaction model stimulating truthful report/feedback is introduced. Service creditability of resources is evaluated based on these reports, which guides users to conduct reasonable resource selection. Simulations show that, this model can regulate grid market efficiently, and reduce the transaction risk.5. To reduce the affection of Sybil attack on P2P system, a Sybil defense mechanism based on small world is proposed. Inducing the difficulty of finding Sybil group to max-flow/min-cut problem, this thesis uses crawler to find Sybil group by adopting an artificial vertex, which can effectively isolate the Sybil attacker nodes from P2P system.