A new matrix of the spectra of prompt fission neutrons for the reaction 235U(n, F) has been obtai... more A new matrix of the spectra of prompt fission neutrons for the reaction 235U(n, F) has been obtained. The evaluated spectrum of prompt fission neutrons reproduces the measured data for incident neutrons with energy from thermal to 14.7 MeV. A solution is proposed for the problem of inconsistency of the integral testing of the systems with a thermal spectrum and differential measurements of the spectra of prompt fission neutrons. The matrix obtained for the spectra of prompt neutrons for 235U(n, F) eliminates the considerable discrepancy between the differential and integral experiments. The description of the integral experiments for compositions with a fast neutron spectrum revealed the compensation effect in the multiplication factor Keff, due to the difference in the shapes of the spectra of prompt fission neutrons, the present work and known libraries. The description of systems with a thermal neutron spectrum shows that the positive shift of the computed Keff is explained by the influence of the low-energy neutrons.
For workflow-based service composition approach, the relations between the Web service QoS and en... more For workflow-based service composition approach, the relations between the Web service QoS and environments are usually not considered, so that the information about QoS for composite service selection is inaccurate. It makes the selected composite service inefficient, or even unexecutable. To address this problem, a novel service composition approach based on production QoS rules is proposed in this paper. Generally, it is very difficult to directly analyze how different kinds of environment factors influence the Web service QoS. We adopt “black-box” analysis method of optimizing composite services, discovering the knowledge such as “the QoS of one Web service will be higher in specific environments”. In our approach, the execution information of the composite service is recorded into a log first, which will be taken as the basis of the subsequent statistical analysis and data mining. Then, the timely QoS values of the Web services are estimated and the production QoS rules being used to qualitatively express the different performances of the Web service QoS in different environments are mined. At last, we employ the mined QoS knowledge of the Web services to optimize the composite service selection. Extensive experimental results show that our approach can improve the performance of selected composite services on the premise of assuring the selecting computation cost.
There are complicated correlations among atomic Web services in a composite service. Considering ... more There are complicated correlations among atomic Web services in a composite service. Considering the influence of such correlations on the quality of composite service is important to do service selection. Now, existing selection approaches don't consider this issue. Using the idea of division, a dot pattern based composite service selection approach is presented in this paper. The main idea of this approach is that according to the correlation degree of atomic services, dividing the composite service into a series of composite service dots; then regarding the dot as selecting unit to do service selection based on the quality of corresponding dot patterns. Experimental results show that our selection approach can improve the quality of the selected composite service.
A new matrix of the spectra of prompt fission neutrons for the reaction 235U(n, F) has been obtai... more A new matrix of the spectra of prompt fission neutrons for the reaction 235U(n, F) has been obtained. The evaluated spectrum of prompt fission neutrons reproduces the measured data for incident neutrons with energy from thermal to 14.7 MeV. A solution is proposed for the problem of inconsistency of the integral testing of the systems with a thermal spectrum and differential measurements of the spectra of prompt fission neutrons. The matrix obtained for the spectra of prompt neutrons for 235U(n, F) eliminates the considerable discrepancy between the differential and integral experiments. The description of the integral experiments for compositions with a fast neutron spectrum revealed the compensation effect in the multiplication factor Keff, due to the difference in the shapes of the spectra of prompt fission neutrons, the present work and known libraries. The description of systems with a thermal neutron spectrum shows that the positive shift of the computed Keff is explained by the influence of the low-energy neutrons.
For workflow-based service composition approach, the relations between the Web service QoS and en... more For workflow-based service composition approach, the relations between the Web service QoS and environments are usually not considered, so that the information about QoS for composite service selection is inaccurate. It makes the selected composite service inefficient, or even unexecutable. To address this problem, a novel service composition approach based on production QoS rules is proposed in this paper. Generally, it is very difficult to directly analyze how different kinds of environment factors influence the Web service QoS. We adopt “black-box” analysis method of optimizing composite services, discovering the knowledge such as “the QoS of one Web service will be higher in specific environments”. In our approach, the execution information of the composite service is recorded into a log first, which will be taken as the basis of the subsequent statistical analysis and data mining. Then, the timely QoS values of the Web services are estimated and the production QoS rules being used to qualitatively express the different performances of the Web service QoS in different environments are mined. At last, we employ the mined QoS knowledge of the Web services to optimize the composite service selection. Extensive experimental results show that our approach can improve the performance of selected composite services on the premise of assuring the selecting computation cost.
There are complicated correlations among atomic Web services in a composite service. Considering ... more There are complicated correlations among atomic Web services in a composite service. Considering the influence of such correlations on the quality of composite service is important to do service selection. Now, existing selection approaches don't consider this issue. Using the idea of division, a dot pattern based composite service selection approach is presented in this paper. The main idea of this approach is that according to the correlation degree of atomic services, dividing the composite service into a series of composite service dots; then regarding the dot as selecting unit to do service selection based on the quality of corresponding dot patterns. Experimental results show that our selection approach can improve the quality of the selected composite service.
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