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This paper analyses update ordering and its impact on the performance of a distributed replication system. We propose a model for update orderings and constraints and develop a number of algorithms for implementing different ordering constraints. A performance study is then carried out to analyse the update-ordering model. We show that our model allows the(More)
Replication is the key to providing high availability, fault tolerance, and enhanced performance in a cluster of workstations (COWs). However, building such a system remains as a dicult and challenging task, mainly due to the diculty of maintaining data consistency among replicas and the lack of easy and ecient tools supporting the development procedure.(More)
BACKGROUND This study was to investigate some new pathological genes in colorectal adenocarcinoma of human. METHODS Human colorectal adenocarcinoma tissues and normal colorectal tissues were taken and suppression subtractive hybridization (SSH) and cDNA microarray techniques were employed. From differentially expressed 86 expressed sequence tags (EST), 10(More)
Service replication is a key to providing high availability, fault tolerance and good performance in distributed systems. However, building a service replication system is a di cult and complex task. This paper describes a tool that mimics the design of the remote procedure call (RPC) system to support building distributed service replication systems. The(More)
Service replication is a key to providing high availability, fault tolerance, and good performance in distributed systems. Various replication schemes have been proposed, they are based on two streams of techniques, namely passive replication and active replication. This paper focuses on two implementation approaches of the passive primary-backup scheme,(More)
With the development of computer network, the smart of communication agents was significantly increased, more intelligent process can be done by computers. To realize this, agents need more detailed concrete message to be transferred. But what should be transferred? How to transfer necessary message to improve the receiver’s understanding capability and not(More)
This paper describes a tool that niiniics the desigti of the rettiote procediire call (RPC) system to siipport the biiilditig of replicated objects in a cliister of wwkstatiotis (COW). The tool includes an interface dejitiitioti latigiiage for describing a replica groiip, a lawgunge preprocessor arid a rirtitinie libran systetti. The paper also presetits(More)