In this paper we develop several new refinement relations of Z for multiple viewpoints oriented requirements method (MVORM). The original motivation is that we found the standard Z refinement relation is not adequate ...In this paper we develop several new refinement relations of Z for multiple viewpoints oriented requirements method (MVORM). The original motivation is that we found the standard Z refinement relation is not adequate or correct when considering specifications that have temporal relationships of operations. The concept of temporal state variables is introduced into Z. Then new implementation relations are defined and new refinement relations are deduced, mainly for temporal state variables to process temporal relationships of operations. We use state transition systems to abstract the temporal state transitions. A simple example is used to show the procedures of MVORM. Finally some directions of further work are forwarded.展开更多
Through the survey of 3 different grassland migrant villages in S Banner,the author studied the influence of ecological migration policies on migrants,and analyzed livelihood selection and adaptation of migrants in th...Through the survey of 3 different grassland migrant villages in S Banner,the author studied the influence of ecological migration policies on migrants,and analyzed livelihood selection and adaptation of migrants in the new environment.Finally,the author put forward corresponding countermeasures,including migration without forbidding grazing,turn to the secondary and tertiary industry,and return to animal husbandry.展开更多
基金Supported by Natural Science Foundation of Hubei Province (98J0 75 ) Ziqiang Technical Innovation Foundation ofWuhan Universi
文摘In this paper we develop several new refinement relations of Z for multiple viewpoints oriented requirements method (MVORM). The original motivation is that we found the standard Z refinement relation is not adequate or correct when considering specifications that have temporal relationships of operations. The concept of temporal state variables is introduced into Z. Then new implementation relations are defined and new refinement relations are deduced, mainly for temporal state variables to process temporal relationships of operations. We use state transition systems to abstract the temporal state transitions. A simple example is used to show the procedures of MVORM. Finally some directions of further work are forwarded.
基金Supported by Foundation Project of Minzu University of China
文摘Through the survey of 3 different grassland migrant villages in S Banner,the author studied the influence of ecological migration policies on migrants,and analyzed livelihood selection and adaptation of migrants in the new environment.Finally,the author put forward corresponding countermeasures,including migration without forbidding grazing,turn to the secondary and tertiary industry,and return to animal husbandry.
