Based on the experience and achievement of the＂China Digital Ocean＂, the classification plan for Marine data elements is made, which can be classified into five, including marine point elements, marine line elements...Based on the experience and achievement of the＂China Digital Ocean＂, the classification plan for Marine data elements is made, which can be classified into five, including marine point elements, marine line elements, marine polygon elements, marine grid elements and marine dynamic elements. In this paper, the technology of features and object-oriented method, a spatial-temporal data model is proposed, which can be applied in the large information system engineering like the ＂Digital Ocean＂, and this paper discusses the application of spatial data model, marine three-dimensional raster data model and relation data model in the building of Data Warehouse in ＂China Digital Ocean＂, and concludes the merits of these models.展开更多
The constriction factor method (CFM) is a new variation of the basic particle swarm optimization (PSO), which has relatively better convergent nature. The effects of the major parameters on CFM were systematically inv...The constriction factor method (CFM) is a new variation of the basic particle swarm optimization (PSO), which has relatively better convergent nature. The effects of the major parameters on CFM were systematically investigated based on some benchmark functions. The constriction factor, velocity constraint, and population size all have significant impact on the per- formance of CFM for PSO. The constriction factor and velocity constraint have optimal values in practical application, and im- proper choice of these factors will lead to bad results. Increasing population size can improve the solution quality, although the computing time will be longer. The characteristics of CFM parameters are described and guidelines for determining parameter values are given in this paper.展开更多
Train control systems ensure the safety of railways. This paper begins with a summary of the typical train control systems in Japan and Europe. Based on this summary, the author then raises the following question rega...Train control systems ensure the safety of railways. This paper begins with a summary of the typical train control systems in Japan and Europe. Based on this summary, the author then raises the following question regarding current train control systems： What approach should be adopted in order to enhance the functionality, safety, and reliability of train control systems and assist in commercial operations on railways？ Next, the author provides a desirable architecture that is likely to assist with the development of new train control systems based on current information and communication technologies. A new unified train control system （UTCS） is proposed that is effective in enhancing the robustness and com- petitiveness of a train control system. The ultimate architecture of the UTCS will be only composed of essential elements such as point machines and level crossing control devices in the field. Finally, a pro- cessing method of the UTCS is discussed.展开更多
This paper discussed the cost and benefit level of the marketing mix of organic vegetable cultivation. In 2011, the research assessed the effectiveness of policy of＂Go Organic 2010＂ in Semarang municipality. The obj...This paper discussed the cost and benefit level of the marketing mix of organic vegetable cultivation. In 2011, the research assessed the effectiveness of policy of＂Go Organic 2010＂ in Semarang municipality. The objectives of this work are to assess： （1] program implementations; （2） related stakeholders; C3] external and internal constrains; （4] the level of effectiveness; and （5） the efficiency on the use of production factors. Further, it aims to improve the competitiveness of the agricultural commodity through using efficient production factors, lessening the environmental damage as the use of pesticide, and promoting awareness of responsibilty among government, university, and society. Having employed interactive approach and SPSS 13.0 program, the result indicates that behavior of farming in the research area sounds to be less efficient. Further, agriculture extension agent performance in Semarang needs also to be better improved. Therefore, improvement on counselling activities is proposed to be a solution to make the performance of the extension optimum. Meanwhile, the number of extension agents is not sufficient. It is expected that the ideal number for extension--one village one extension--can be applied.展开更多
Natural environments contribute to people’s perception,preference and health restoration.Many researchers have focused either on the positive effects of overall rural environments on stress recovery or concentrated o...Natural environments contribute to people’s perception,preference and health restoration.Many researchers have focused either on the positive effects of overall rural environments on stress recovery or concentrated on the perception and preference aspects of the rural landscape,but few have integrated perception,preference and stress recovery simultaneously.This paper developed a framework which includes 11 elements and 38 element components related to Linpan,China,and distributed it online as part of a survey.As a result,a total of 324 valid questionnaires were collected.The questionnaire included demographic details,perception and preference degree for Linpan,as well as self-estimations of stress recovery.Stepwise multiple linear regression was employed,and revealed 16 significant predictors for the perception,preference and stress recovery in rural environments.In terms of elements,atmosphere and imagery were the two elements that could be best perceived,while woodland,farmland,water,residence and road were the five most important elements for the preference.Moreover,seven elements were also identified as significant predictors for stress recovery.Among the element components,tranquility as well as road and water proximity were the two significant predictors for perception,while wide visibility as well as woodland and residence blending contributed significantly to stress recovery.The five element components of woodland interior,vegetable field,stream,courtyard space and branch road each had a significantly predictive ability for preference and stress recovery.These findings extend the understanding of the perception,preference and restorative properties of rural environments through the combination of elements and element components in Linpan of Western Sichuan,helping to improve the quality and characteristics of rural external and internal environments and create health-promoting environments.展开更多
In this paper,we simulate,verify,and compare the performance of three classical geomagnetic matching aided navigation algorithms to assess their applicability to hypersonic vehicle navigation.Firstly,we introduce the ...In this paper,we simulate,verify,and compare the performance of three classical geomagnetic matching aided navigation algorithms to assess their applicability to hypersonic vehicle navigation.Firstly,we introduce the various sources of the geomagnetic field.Secondly,we describe the principles and processes of the geomagnetic contour matching(MAGCOM)algorithm,iterative closest contour point(ICCP)algorithm,and Sandia inertial magnetic aided navigation(SIMAN)algorithm.Thirdly,we discuss the principles of inertial/geomagnetic integrated navigation,and propose the state and observation equations of integrated navigation.Finally,we perform a simulation of inertial/geomagnetic integrated navigation on the hypersonic boost-glide vehicle trajectory.The simulation results indicate that the real-time performance of the SIMAN algorithm can be optimized such that the matching accuracy is higher than that of the other two algorithms.At the same time,the SIMAN algorithm can achieve better stability,and though the amount of measurement noise can be larger,it can still achieve good positioning accuracy.展开更多
文摘Based on the experience and achievement of the＂China Digital Ocean＂, the classification plan for Marine data elements is made, which can be classified into five, including marine point elements, marine line elements, marine polygon elements, marine grid elements and marine dynamic elements. In this paper, the technology of features and object-oriented method, a spatial-temporal data model is proposed, which can be applied in the large information system engineering like the ＂Digital Ocean＂, and this paper discusses the application of spatial data model, marine three-dimensional raster data model and relation data model in the building of Data Warehouse in ＂China Digital Ocean＂, and concludes the merits of these models.
基金Project (No. 20276063) supported by the National Natural Sci-ence Foundation of China
文摘The constriction factor method (CFM) is a new variation of the basic particle swarm optimization (PSO), which has relatively better convergent nature. The effects of the major parameters on CFM were systematically investigated based on some benchmark functions. The constriction factor, velocity constraint, and population size all have significant impact on the per- formance of CFM for PSO. The constriction factor and velocity constraint have optimal values in practical application, and im- proper choice of these factors will lead to bad results. Increasing population size can improve the solution quality, although the computing time will be longer. The characteristics of CFM parameters are described and guidelines for determining parameter values are given in this paper.
文摘Train control systems ensure the safety of railways. This paper begins with a summary of the typical train control systems in Japan and Europe. Based on this summary, the author then raises the following question regarding current train control systems： What approach should be adopted in order to enhance the functionality, safety, and reliability of train control systems and assist in commercial operations on railways？ Next, the author provides a desirable architecture that is likely to assist with the development of new train control systems based on current information and communication technologies. A new unified train control system （UTCS） is proposed that is effective in enhancing the robustness and com- petitiveness of a train control system. The ultimate architecture of the UTCS will be only composed of essential elements such as point machines and level crossing control devices in the field. Finally, a pro- cessing method of the UTCS is discussed.
文摘This paper discussed the cost and benefit level of the marketing mix of organic vegetable cultivation. In 2011, the research assessed the effectiveness of policy of＂Go Organic 2010＂ in Semarang municipality. The objectives of this work are to assess： （1] program implementations; （2） related stakeholders; C3] external and internal constrains; （4] the level of effectiveness; and （5） the efficiency on the use of production factors. Further, it aims to improve the competitiveness of the agricultural commodity through using efficient production factors, lessening the environmental damage as the use of pesticide, and promoting awareness of responsibilty among government, university, and society. Having employed interactive approach and SPSS 13.0 program, the result indicates that behavior of farming in the research area sounds to be less efficient. Further, agriculture extension agent performance in Semarang needs also to be better improved. Therefore, improvement on counselling activities is proposed to be a solution to make the performance of the extension optimum. Meanwhile, the number of extension agents is not sufficient. It is expected that the ideal number for extension--one village one extension--can be applied.
基金The National Natural Science Foundation of China(31870703)。
文摘Natural environments contribute to people’s perception,preference and health restoration.Many researchers have focused either on the positive effects of overall rural environments on stress recovery or concentrated on the perception and preference aspects of the rural landscape,but few have integrated perception,preference and stress recovery simultaneously.This paper developed a framework which includes 11 elements and 38 element components related to Linpan,China,and distributed it online as part of a survey.As a result,a total of 324 valid questionnaires were collected.The questionnaire included demographic details,perception and preference degree for Linpan,as well as self-estimations of stress recovery.Stepwise multiple linear regression was employed,and revealed 16 significant predictors for the perception,preference and stress recovery in rural environments.In terms of elements,atmosphere and imagery were the two elements that could be best perceived,while woodland,farmland,water,residence and road were the five most important elements for the preference.Moreover,seven elements were also identified as significant predictors for stress recovery.Among the element components,tranquility as well as road and water proximity were the two significant predictors for perception,while wide visibility as well as woodland and residence blending contributed significantly to stress recovery.The five element components of woodland interior,vegetable field,stream,courtyard space and branch road each had a significantly predictive ability for preference and stress recovery.These findings extend the understanding of the perception,preference and restorative properties of rural environments through the combination of elements and element components in Linpan of Western Sichuan,helping to improve the quality and characteristics of rural external and internal environments and create health-promoting environments.
基金supported by the Space Science and Technology Innovation Fund of China(No.2016KC020028)the Fund of China Space Science and Technology(No.2017-HT-XG)。
文摘In this paper,we simulate,verify,and compare the performance of three classical geomagnetic matching aided navigation algorithms to assess their applicability to hypersonic vehicle navigation.Firstly,we introduce the various sources of the geomagnetic field.Secondly,we describe the principles and processes of the geomagnetic contour matching(MAGCOM)algorithm,iterative closest contour point(ICCP)algorithm,and Sandia inertial magnetic aided navigation(SIMAN)algorithm.Thirdly,we discuss the principles of inertial/geomagnetic integrated navigation,and propose the state and observation equations of integrated navigation.Finally,we perform a simulation of inertial/geomagnetic integrated navigation on the hypersonic boost-glide vehicle trajectory.The simulation results indicate that the real-time performance of the SIMAN algorithm can be optimized such that the matching accuracy is higher than that of the other two algorithms.At the same time,the SIMAN algorithm can achieve better stability,and though the amount of measurement noise can be larger,it can still achieve good positioning accuracy.
