Disk mirroring or RAID1 is a popular paradigm to achieve fault tolerance and high reliability, th... more Disk mirroring or RAID1 is a popular paradigm to achieve fault tolerance and high reliability, this paper describes four mirrored disk organizations: basic mirroring, group rotate declustering, interleaved declustering, chained declustering, then the membership function of the states is defined and the reliability of mirrored disk system is analyzed by using the reliability theory based on fuzzy state.
Reliability models for various fault tolerant computer architectures are developed. Markov model ... more Reliability models for various fault tolerant computer architectures are developed. Markov model is very useful calculating with state space by using transition probability and initial value. In practice, sometimes we can not have the exact values of lambda, mu, rho but with some uncertainty about these values. The combination fuzzy logic and Markov model method is introduced and analyzed besides
How to effectively analyze and evaluate service availability of supply chain system is a challeng... more How to effectively analyze and evaluate service availability of supply chain system is a challenging problem for investigators. In this paper, the architecture of Web-based services of multi-layer supply chain management system is interpreted elaborately at first, and then the service availability modeling and performance modeling for this system is designed and analyzed. Finally, the sensitivity analysis of responding parameters to service availability is presented. The result can help designs find right tradeoffs for achieving availability while providing acceptable levels of performance.
The RAID5x is a two-disk failure-tolerant scheme of disk array that can be moved to the distribut... more The RAID5x is a two-disk failure-tolerant scheme of disk array that can be moved to the distributed environments. This new scheme called RAID5x variation can guarantees fault tolerance both to double node and double disk failures, there are two variations based on data distribution for placing data, parity, and mirrored copies within a periodical stripe: disk clustering and disk de-clustering. Then this paper analyzed the reliability of this system by combination of fuzzy logic and Markov modeling. This reliability method is a technique for analyzing fault tolerant designs under considerable uncertainty, such as is seen in compilations of component failure rates, the presented model provides the estimation of the lower and upper boundary of RAID5x variation with a single run of the model.
E-learning started to attract a lot of attention from researchers as well as practitioners recent... more E-learning started to attract a lot of attention from researchers as well as practitioners recently. Many of the existing architectures of e-learning systems are mainly based on plain client-server or peer-to-peer architectures and are therefore suffering from drawbacks like poor scalability or complicated interchange of content. In this paper, we first present a distributed, service-oriented soft architecture for e-learning development platform based on Web services, and design the availability model for web services. Secondly, according to queuening theory, we obtain closed form equations of the availability of web services, from which sensitivity analyses are conducted in detail. Finally, the result achieved form this model can help designers of the E-learning development platform system find the right tradeoffs for achieving availability of users expected while providing acceptable levels of performance.
Many Internet applications employ 3-tier software architecture such as e-commerce system. Startin... more Many Internet applications employ 3-tier software architecture such as e-commerce system. Starting from analyze the architecture of an e-commerce development platform model based on 3-tiered Web, We present by using queuing network theory, we propose a reusable e-commerce development platform based on 3-tiered Web. Finally, we implement the MVA algorithm with the help of Matlab and test the experimental data
CRC and checksum are two error-detecting mechanisms widely used in the computer network. A novice... more CRC and checksum are two error-detecting mechanisms widely used in the computer network. A novice evaluating simulation model based on attacking these two codes is proposed and the correspondent evaluating methods are discussed. In this model, the size and content of any data packet is produced by random number generator and the changes of the packet's content is implemented by simulating natural and manual attacks. The results show that these two error-detecting codes have the strong ability against natural attacks, but no ability against manual attacks which facilitate the destruction of data authentication and data-accessing availability.
... While the previously introduced operations return with NULL in case no data was detected, the... more ... While the previously introduced operations return with NULL in case no data was detected, the blocking versions wait until some match is detected or the timeout runs out. The semantics is otherwise precisely as above. ... [2]. D. Fensel, R. Krummenacher, O. Shafiq, E. Ku¨ hn, J ...
Disk mirroring or RAID1 is a popular paradigm to achieve fault tolerance and high reliability, th... more Disk mirroring or RAID1 is a popular paradigm to achieve fault tolerance and high reliability, this paper describes four mirrored disk organizations: basic mirroring, group rotate declustering, interleaved declustering, chained declustering, then the membership function of the states is defined and the reliability of mirrored disk system is analyzed by using the reliability theory based on fuzzy state.
Reliability models for various fault tolerant computer architectures are developed. Markov model ... more Reliability models for various fault tolerant computer architectures are developed. Markov model is very useful calculating with state space by using transition probability and initial value. In practice, sometimes we can not have the exact values of lambda, mu, rho but with some uncertainty about these values. The combination fuzzy logic and Markov model method is introduced and analyzed besides
How to effectively analyze and evaluate service availability of supply chain system is a challeng... more How to effectively analyze and evaluate service availability of supply chain system is a challenging problem for investigators. In this paper, the architecture of Web-based services of multi-layer supply chain management system is interpreted elaborately at first, and then the service availability modeling and performance modeling for this system is designed and analyzed. Finally, the sensitivity analysis of responding parameters to service availability is presented. The result can help designs find right tradeoffs for achieving availability while providing acceptable levels of performance.
The RAID5x is a two-disk failure-tolerant scheme of disk array that can be moved to the distribut... more The RAID5x is a two-disk failure-tolerant scheme of disk array that can be moved to the distributed environments. This new scheme called RAID5x variation can guarantees fault tolerance both to double node and double disk failures, there are two variations based on data distribution for placing data, parity, and mirrored copies within a periodical stripe: disk clustering and disk de-clustering. Then this paper analyzed the reliability of this system by combination of fuzzy logic and Markov modeling. This reliability method is a technique for analyzing fault tolerant designs under considerable uncertainty, such as is seen in compilations of component failure rates, the presented model provides the estimation of the lower and upper boundary of RAID5x variation with a single run of the model.
E-learning started to attract a lot of attention from researchers as well as practitioners recent... more E-learning started to attract a lot of attention from researchers as well as practitioners recently. Many of the existing architectures of e-learning systems are mainly based on plain client-server or peer-to-peer architectures and are therefore suffering from drawbacks like poor scalability or complicated interchange of content. In this paper, we first present a distributed, service-oriented soft architecture for e-learning development platform based on Web services, and design the availability model for web services. Secondly, according to queuening theory, we obtain closed form equations of the availability of web services, from which sensitivity analyses are conducted in detail. Finally, the result achieved form this model can help designers of the E-learning development platform system find the right tradeoffs for achieving availability of users expected while providing acceptable levels of performance.
Many Internet applications employ 3-tier software architecture such as e-commerce system. Startin... more Many Internet applications employ 3-tier software architecture such as e-commerce system. Starting from analyze the architecture of an e-commerce development platform model based on 3-tiered Web, We present by using queuing network theory, we propose a reusable e-commerce development platform based on 3-tiered Web. Finally, we implement the MVA algorithm with the help of Matlab and test the experimental data
CRC and checksum are two error-detecting mechanisms widely used in the computer network. A novice... more CRC and checksum are two error-detecting mechanisms widely used in the computer network. A novice evaluating simulation model based on attacking these two codes is proposed and the correspondent evaluating methods are discussed. In this model, the size and content of any data packet is produced by random number generator and the changes of the packet's content is implemented by simulating natural and manual attacks. The results show that these two error-detecting codes have the strong ability against natural attacks, but no ability against manual attacks which facilitate the destruction of data authentication and data-accessing availability.
... While the previously introduced operations return with NULL in case no data was detected, the... more ... While the previously introduced operations return with NULL in case no data was detected, the blocking versions wait until some match is detected or the timeout runs out. The semantics is otherwise precisely as above. ... [2]. D. Fensel, R. Krummenacher, O. Shafiq, E. Ku¨ hn, J ...
Disk mirroring or RAID1 is a popular paradigm to achieve fault tolerance and high reliability, th... more Disk mirroring or RAID1 is a popular paradigm to achieve fault tolerance and high reliability, this paper describes four mirrored disk organizations: basic mirroring, group rotate declustering, interleaved declustering, chained declustering, then the membership function of the states is defined and the reliability of mirrored disk system is analyzed by using the reliability theory based on fuzzy state.
Reliability models for various fault tolerant computer architectures are developed. Markov model ... more Reliability models for various fault tolerant computer architectures are developed. Markov model is very useful calculating with state space by using transition probability and initial value. In practice, sometimes we can not have the exact values of lambda, mu, rho but with some uncertainty about these values. The combination fuzzy logic and Markov model method is introduced and analyzed besides
How to effectively analyze and evaluate service availability of supply chain system is a challeng... more How to effectively analyze and evaluate service availability of supply chain system is a challenging problem for investigators. In this paper, the architecture of Web-based services of multi-layer supply chain management system is interpreted elaborately at first, and then the service availability modeling and performance modeling for this system is designed and analyzed. Finally, the sensitivity analysis of responding parameters to service availability is presented. The result can help designs find right tradeoffs for achieving availability while providing acceptable levels of performance.
The RAID5x is a two-disk failure-tolerant scheme of disk array that can be moved to the distribut... more The RAID5x is a two-disk failure-tolerant scheme of disk array that can be moved to the distributed environments. This new scheme called RAID5x variation can guarantees fault tolerance both to double node and double disk failures, there are two variations based on data distribution for placing data, parity, and mirrored copies within a periodical stripe: disk clustering and disk de-clustering. Then this paper analyzed the reliability of this system by combination of fuzzy logic and Markov modeling. This reliability method is a technique for analyzing fault tolerant designs under considerable uncertainty, such as is seen in compilations of component failure rates, the presented model provides the estimation of the lower and upper boundary of RAID5x variation with a single run of the model.
E-learning started to attract a lot of attention from researchers as well as practitioners recent... more E-learning started to attract a lot of attention from researchers as well as practitioners recently. Many of the existing architectures of e-learning systems are mainly based on plain client-server or peer-to-peer architectures and are therefore suffering from drawbacks like poor scalability or complicated interchange of content. In this paper, we first present a distributed, service-oriented soft architecture for e-learning development platform based on Web services, and design the availability model for web services. Secondly, according to queuening theory, we obtain closed form equations of the availability of web services, from which sensitivity analyses are conducted in detail. Finally, the result achieved form this model can help designers of the E-learning development platform system find the right tradeoffs for achieving availability of users expected while providing acceptable levels of performance.
Many Internet applications employ 3-tier software architecture such as e-commerce system. Startin... more Many Internet applications employ 3-tier software architecture such as e-commerce system. Starting from analyze the architecture of an e-commerce development platform model based on 3-tiered Web, We present by using queuing network theory, we propose a reusable e-commerce development platform based on 3-tiered Web. Finally, we implement the MVA algorithm with the help of Matlab and test the experimental data
CRC and checksum are two error-detecting mechanisms widely used in the computer network. A novice... more CRC and checksum are two error-detecting mechanisms widely used in the computer network. A novice evaluating simulation model based on attacking these two codes is proposed and the correspondent evaluating methods are discussed. In this model, the size and content of any data packet is produced by random number generator and the changes of the packet's content is implemented by simulating natural and manual attacks. The results show that these two error-detecting codes have the strong ability against natural attacks, but no ability against manual attacks which facilitate the destruction of data authentication and data-accessing availability.
... While the previously introduced operations return with NULL in case no data was detected, the... more ... While the previously introduced operations return with NULL in case no data was detected, the blocking versions wait until some match is detected or the timeout runs out. The semantics is otherwise precisely as above. ... [2]. D. Fensel, R. Krummenacher, O. Shafiq, E. Ku¨ hn, J ...
Disk mirroring or RAID1 is a popular paradigm to achieve fault tolerance and high reliability, th... more Disk mirroring or RAID1 is a popular paradigm to achieve fault tolerance and high reliability, this paper describes four mirrored disk organizations: basic mirroring, group rotate declustering, interleaved declustering, chained declustering, then the membership function of the states is defined and the reliability of mirrored disk system is analyzed by using the reliability theory based on fuzzy state.
Reliability models for various fault tolerant computer architectures are developed. Markov model ... more Reliability models for various fault tolerant computer architectures are developed. Markov model is very useful calculating with state space by using transition probability and initial value. In practice, sometimes we can not have the exact values of lambda, mu, rho but with some uncertainty about these values. The combination fuzzy logic and Markov model method is introduced and analyzed besides
How to effectively analyze and evaluate service availability of supply chain system is a challeng... more How to effectively analyze and evaluate service availability of supply chain system is a challenging problem for investigators. In this paper, the architecture of Web-based services of multi-layer supply chain management system is interpreted elaborately at first, and then the service availability modeling and performance modeling for this system is designed and analyzed. Finally, the sensitivity analysis of responding parameters to service availability is presented. The result can help designs find right tradeoffs for achieving availability while providing acceptable levels of performance.
The RAID5x is a two-disk failure-tolerant scheme of disk array that can be moved to the distribut... more The RAID5x is a two-disk failure-tolerant scheme of disk array that can be moved to the distributed environments. This new scheme called RAID5x variation can guarantees fault tolerance both to double node and double disk failures, there are two variations based on data distribution for placing data, parity, and mirrored copies within a periodical stripe: disk clustering and disk de-clustering. Then this paper analyzed the reliability of this system by combination of fuzzy logic and Markov modeling. This reliability method is a technique for analyzing fault tolerant designs under considerable uncertainty, such as is seen in compilations of component failure rates, the presented model provides the estimation of the lower and upper boundary of RAID5x variation with a single run of the model.
E-learning started to attract a lot of attention from researchers as well as practitioners recent... more E-learning started to attract a lot of attention from researchers as well as practitioners recently. Many of the existing architectures of e-learning systems are mainly based on plain client-server or peer-to-peer architectures and are therefore suffering from drawbacks like poor scalability or complicated interchange of content. In this paper, we first present a distributed, service-oriented soft architecture for e-learning development platform based on Web services, and design the availability model for web services. Secondly, according to queuening theory, we obtain closed form equations of the availability of web services, from which sensitivity analyses are conducted in detail. Finally, the result achieved form this model can help designers of the E-learning development platform system find the right tradeoffs for achieving availability of users expected while providing acceptable levels of performance.
Many Internet applications employ 3-tier software architecture such as e-commerce system. Startin... more Many Internet applications employ 3-tier software architecture such as e-commerce system. Starting from analyze the architecture of an e-commerce development platform model based on 3-tiered Web, We present by using queuing network theory, we propose a reusable e-commerce development platform based on 3-tiered Web. Finally, we implement the MVA algorithm with the help of Matlab and test the experimental data
CRC and checksum are two error-detecting mechanisms widely used in the computer network. A novice... more CRC and checksum are two error-detecting mechanisms widely used in the computer network. A novice evaluating simulation model based on attacking these two codes is proposed and the correspondent evaluating methods are discussed. In this model, the size and content of any data packet is produced by random number generator and the changes of the packet's content is implemented by simulating natural and manual attacks. The results show that these two error-detecting codes have the strong ability against natural attacks, but no ability against manual attacks which facilitate the destruction of data authentication and data-accessing availability.
... While the previously introduced operations return with NULL in case no data was detected, the... more ... While the previously introduced operations return with NULL in case no data was detected, the blocking versions wait until some match is detected or the timeout runs out. The semantics is otherwise precisely as above. ... [2]. D. Fensel, R. Krummenacher, O. Shafiq, E. Ku¨ hn, J ...
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