With the development of rapid-response Earth-observing techniques, the demand for reducing a requirements-tasking-effects cycle from 1 day to hours grows rapidly. For instance, a satellite user always wants to receive...With the development of rapid-response Earth-observing techniques, the demand for reducing a requirements-tasking-effects cycle from 1 day to hours grows rapidly. For instance, a satellite user always wants to receive requested data in near real-time to support their urgent mis- sions, such as dealing with wildfires, volcanoes, flooding events, etc. In this paper, we try to reduce data transmission time for achieving this goal. The new feature of a responsive satellite is that users can receive signals from it directly. Therefore, the traditional satellite control and operational tech- niques need to be improved to accommodate these changes in user needs and technical upgrading. With that in mind, a data transmission topological model is constructed. Based on this model, we can deal with the satellite data transmission problem as a multi-constraint and multi-objective path- scheduling problem. However, there are many optional data transmission paths for each target based on this model, and the shortest path is preferred. In addition, satellites represent scarce resources that must be carefully scheduled in order to satisfy as many consumer requests as possible. To efficiently balance response time and resource utilization, a K-shortest path genetic algorithm is proposed for solving the data transmission problem. Simulations and analysis show the feasibility and the adaptability of the proposed approach.展开更多
With the development of operationally responsive space（ORS） and on-board processing techniques, the end users canreceive the observation data from the ORS satellite directly. Tosatisfy the demand for reducing the re...With the development of operationally responsive space（ORS） and on-board processing techniques, the end users canreceive the observation data from the ORS satellite directly. Tosatisfy the demand for reducing the requirements-tasking-effectscycle from one day to hours, the various resources of the wholedata acquisition chain （including satellites, ground stations, dataprocessing centers, users, etc.） should be taken into an overallconsideration, and the traditional batch task planning mode shouldbe transformed into the user-oriented task planning mode. Consideringthere are many approaches for data acquisition due tothe new techniques of ORS satellite, the data acquisition chaintask planning problem for ORS satellite can be seen as the multimodalroute planning problem. Thereby, a framework is presentedusing label-constrained shortest path technique with the conflictresolution. To apply this framework to solve the ORS satellite taskplanning problem, the preprocessing and the conflict resolutionstrategies are discussed in detail. Based on the above work, theuser-oriented data acquisition chain task planning algorithm forORS satellite is proposed. The exact solution can be obtainedin polynomial time using the proposed algorithm. The simulationexperiments validate the feasibility and the adaptability of the proposedapproach.展开更多
The worldwide technology group Freudenberg has continued its good business development despite challenging economic conditions.In 2017,the global technology group with German roots boosted sales to€9.3 billion or CNY ...The worldwide technology group Freudenberg has continued its good business development despite challenging economic conditions.In 2017,the global technology group with German roots boosted sales to€9.3 billion or CNY 71,547 million.That constitutes a rise of 18.3 percent over the previous year.The future-oriented nature of the Group is evident from the fact that about one third of sales is earned with products introduced less than four years ago.Freudenberg’s business in Greater China also performed strongly,with sales growing by some 15%to CNY 8.3 billion.The rise in sales is the result of continuous investments in existing and new projects,the market success of the Group’s innovative products in China and its contribution to China’s sustainability targets.“Both operationally and strategically,2017 was a successful year for Freudenberg,”said Dr.Mohsen Sohi,CEO of the Freudenberg Group,at the press conference in Beijing.“We are well on our way to being one of the most innovative and efficient technology companies.”The Group aims to further balance its portfolio towards generating onethird of sales each in Asia,the Americas and Europe.“The Chinese market plays a key role in our existing and future operations,and our diversified and innovative portfolio caters to the demands of China’s industry,while at the same time supporting the goals of the current Five-Year Program.”Freudenberg has been supporting Chinese customers for more than 100 years.展开更多
基金supported in part by the National Natural Science Foundation of China (Nos. 61174159, 61101184)
文摘With the development of rapid-response Earth-observing techniques, the demand for reducing a requirements-tasking-effects cycle from 1 day to hours grows rapidly. For instance, a satellite user always wants to receive requested data in near real-time to support their urgent mis- sions, such as dealing with wildfires, volcanoes, flooding events, etc. In this paper, we try to reduce data transmission time for achieving this goal. The new feature of a responsive satellite is that users can receive signals from it directly. Therefore, the traditional satellite control and operational tech- niques need to be improved to accommodate these changes in user needs and technical upgrading. With that in mind, a data transmission topological model is constructed. Based on this model, we can deal with the satellite data transmission problem as a multi-constraint and multi-objective path- scheduling problem. However, there are many optional data transmission paths for each target based on this model, and the shortest path is preferred. In addition, satellites represent scarce resources that must be carefully scheduled in order to satisfy as many consumer requests as possible. To efficiently balance response time and resource utilization, a K-shortest path genetic algorithm is proposed for solving the data transmission problem. Simulations and analysis show the feasibility and the adaptability of the proposed approach.
基金supported by the National Natural Science Foundation of China(6110118461174159)
文摘With the development of operationally responsive space（ORS） and on-board processing techniques, the end users canreceive the observation data from the ORS satellite directly. Tosatisfy the demand for reducing the requirements-tasking-effectscycle from one day to hours, the various resources of the wholedata acquisition chain （including satellites, ground stations, dataprocessing centers, users, etc.） should be taken into an overallconsideration, and the traditional batch task planning mode shouldbe transformed into the user-oriented task planning mode. Consideringthere are many approaches for data acquisition due tothe new techniques of ORS satellite, the data acquisition chaintask planning problem for ORS satellite can be seen as the multimodalroute planning problem. Thereby, a framework is presentedusing label-constrained shortest path technique with the conflictresolution. To apply this framework to solve the ORS satellite taskplanning problem, the preprocessing and the conflict resolutionstrategies are discussed in detail. Based on the above work, theuser-oriented data acquisition chain task planning algorithm forORS satellite is proposed. The exact solution can be obtainedin polynomial time using the proposed algorithm. The simulationexperiments validate the feasibility and the adaptability of the proposedapproach.
文摘The worldwide technology group Freudenberg has continued its good business development despite challenging economic conditions.In 2017,the global technology group with German roots boosted sales to€9.3 billion or CNY 71,547 million.That constitutes a rise of 18.3 percent over the previous year.The future-oriented nature of the Group is evident from the fact that about one third of sales is earned with products introduced less than four years ago.Freudenberg’s business in Greater China also performed strongly,with sales growing by some 15%to CNY 8.3 billion.The rise in sales is the result of continuous investments in existing and new projects,the market success of the Group’s innovative products in China and its contribution to China’s sustainability targets.“Both operationally and strategically,2017 was a successful year for Freudenberg,”said Dr.Mohsen Sohi,CEO of the Freudenberg Group,at the press conference in Beijing.“We are well on our way to being one of the most innovative and efficient technology companies.”The Group aims to further balance its portfolio towards generating onethird of sales each in Asia,the Americas and Europe.“The Chinese market plays a key role in our existing and future operations,and our diversified and innovative portfolio caters to the demands of China’s industry,while at the same time supporting the goals of the current Five-Year Program.”Freudenberg has been supporting Chinese customers for more than 100 years.
