A method of topology synthesis based on graph theory and mechanism combination theory was applied to the configuration design of locomotion systems of lunar exploration rovers(LER).Through topology combination of whee...A method of topology synthesis based on graph theory and mechanism combination theory was applied to the configuration design of locomotion systems of lunar exploration rovers(LER).Through topology combination of wheel structural unit,suspension unit,and connecting device unit between suspension and load platform,some new locomotion system configurations were proposed and the metrics and indexes to evaluate the performance of the new locomotion system were analyzed.Performance evaluation and comparison between two LER with locomotion systems of different configurations were analyzed.The analysis results indicate that the new locomotion system configuration has good trafficability performance.展开更多
Exhibition performance should be evaluated from different perspectives of stakeholders.The benefits of each stakeholder can not be satisfied when evaluating the exhibition performance from a single perspective or only...Exhibition performance should be evaluated from different perspectives of stakeholders.The benefits of each stakeholder can not be satisfied when evaluating the exhibition performance from a single perspective or only evaluating the economic performance of the exhibition.In this paper,the stakeholders are defined on the basis of questionnaire investigation and classified by mathematical statistical method.According to the requirements of the stakeholders,the exhibition performance appraisal indicators are extracted and simplified by factor analysis,which leads to the formation of a set of performance appraisal index system.It is an instructive attempt to work out the exhibition performance appraisal model from the perspective of stakeholders,which may provide theoretical foundation and practice instruction for exhibition performance appraisal in our country.展开更多
The framework of forest valuation accounting has been formed through the development stages of timber value calculation, forest ecosystem valuation and entire value accounting of forest resources, including the forest...The framework of forest valuation accounting has been formed through the development stages of timber value calculation, forest ecosystem valuation and entire value accounting of forest resources, including the forest values of resources in kind, environmental resources and social benefits in China. These theory and methods still face deviation of theories and methods from vague position of discipline, larger accounting results from ignoring differences between forest ecological functions and ecosystem services, and unrealistic and other problems from non-standard index system and accounting methods due to the development history and other reasons. Five suggestions are proposed to make explicit the object and purpose of the forest resource value accounting, establish universal, scientific, measurable and concise index system for value evaluation, calculate forest resources value in consideration of forest type and position, distinguish accurately the functions from benefits of the forest resources, and suit value calculation result to the practice of social economy.展开更多
基金Supported by National "863" High-Tech Program (No.2006AA04Z231)Foundation of State Key Laboratory of Robotics and Systems (No.SKLRS-200801A02)+1 种基金the College Discipline Innovation Wisdom Plan (No.B07018)Natural Science Foundation of Heilongjiang Province (No.ZJG0709)
文摘A method of topology synthesis based on graph theory and mechanism combination theory was applied to the configuration design of locomotion systems of lunar exploration rovers(LER).Through topology combination of wheel structural unit,suspension unit,and connecting device unit between suspension and load platform,some new locomotion system configurations were proposed and the metrics and indexes to evaluate the performance of the new locomotion system were analyzed.Performance evaluation and comparison between two LER with locomotion systems of different configurations were analyzed.The analysis results indicate that the new locomotion system configuration has good trafficability performance.
文摘Exhibition performance should be evaluated from different perspectives of stakeholders.The benefits of each stakeholder can not be satisfied when evaluating the exhibition performance from a single perspective or only evaluating the economic performance of the exhibition.In this paper,the stakeholders are defined on the basis of questionnaire investigation and classified by mathematical statistical method.According to the requirements of the stakeholders,the exhibition performance appraisal indicators are extracted and simplified by factor analysis,which leads to the formation of a set of performance appraisal index system.It is an instructive attempt to work out the exhibition performance appraisal model from the perspective of stakeholders,which may provide theoretical foundation and practice instruction for exhibition performance appraisal in our country.
文摘The framework of forest valuation accounting has been formed through the development stages of timber value calculation, forest ecosystem valuation and entire value accounting of forest resources, including the forest values of resources in kind, environmental resources and social benefits in China. These theory and methods still face deviation of theories and methods from vague position of discipline, larger accounting results from ignoring differences between forest ecological functions and ecosystem services, and unrealistic and other problems from non-standard index system and accounting methods due to the development history and other reasons. Five suggestions are proposed to make explicit the object and purpose of the forest resource value accounting, establish universal, scientific, measurable and concise index system for value evaluation, calculate forest resources value in consideration of forest type and position, distinguish accurately the functions from benefits of the forest resources, and suit value calculation result to the practice of social economy.
