As low-cost and highly autonomous ocean observation platforms,underwater gliders encounter risks during their launch and recovery,especially when coordinating multi-glider deployments.This work focuses on cooperative ...As low-cost and highly autonomous ocean observation platforms,underwater gliders encounter risks during their launch and recovery,especially when coordinating multi-glider deployments.This work focuses on cooperative path planning of an underwater glider fleet with simultaneous launch and recovery to enhance the autonomy of sampling and reduce deployment risks.Specifically,the gliders collaborate to achieve sampling considering the specified routines of interest.The overall paths to be planned are divided into four rectangular parts with the same starting point,and each glider is assigned a local sampling route.A clipped-oriented line-of-sight algorithm is proposed to ensure the coverage of the desired edges.The pitch angle of the glider is selected as the optimizing parameter to coordinate the overall progress considering the susceptibility of gliders to currents and the randomness of paths produced by complex navigational strategies.Therefore,a multi-actuation deep-Q network algorithm is proposed to ensure simultaneous launch and recovery.Simulation results demonstrate the acceptable effectiveness of the proposed method.展开更多
China’s space activities began in1970.On April 24,that year Chi-na successfully launched its firstsatellite,the DFH-1,with a Chi-na-made Long March vehicle.Thiswas the prelude to China’s space ac-tivities. Up to now...China’s space activities began in1970.On April 24,that year Chi-na successfully launched its firstsatellite,the DFH-1,with a Chi-na-made Long March vehicle.Thiswas the prelude to China’s space ac-tivities. Up to now,China has developed7 versions of LM series launch ve-hicles and put them into use andlaunched 4 kinds of 38 varioussatellites with different purposes in-to different orbits,including 5 for-eign satellites:Asiasat 1 satellite ofAsiasat Corp.,LTD.,Pakistanipiggyback BADR-A scientific ex-展开更多
The first satellite jointly developed by China and France,China-France Oceanography Satellite(CFOSAT),will be launched on a LM carrier rocket in the second half of 2018 announced at a press conference jointly held by ...The first satellite jointly developed by China and France,China-France Oceanography Satellite(CFOSAT),will be launched on a LM carrier rocket in the second half of 2018 announced at a press conference jointly held by the China National Space Administration(CNSA)and French embassy in Beijing.The satellite is being tested at a Beijingbased AIT center of CNSA.CFOSAT is an oceanic satellite supported under a joint project of CNSA and the National Center for Space Studies(CNES)of France.It will carry展开更多
"The launch of the IP-Key project witnesses the commitment of both parties to further strengthen their co-operation on IP issues with a view to making a fundamental con-tribution to the innovation of their respec..."The launch of the IP-Key project witnesses the commitment of both parties to further strengthen their co-operation on IP issues with a view to making a fundamental con-tribution to the innovation of their respective economies."展开更多
China launches three more free trade zones Three new free trade zones(FTZ)began official operation on April 21 as China seeks to draw more international commerce.The new zones were established 18 months after the firs...China launches three more free trade zones Three new free trade zones(FTZ)began official operation on April 21 as China seeks to draw more international commerce.The new zones were established 18 months after the first FTZ was unveiled in the financial hub Shanghai,which was designed to help streamline the overloaded administrative approval system and encourage innovation展开更多
In his recent visit to China,Mr.Alain Vidalies,minister of state for Transport,Marine Affairs and Fisheres,attached to the Minister of Ecllogy,Sustainable Development and Energy of Trance,addressed the press conferenc...In his recent visit to China,Mr.Alain Vidalies,minister of state for Transport,Marine Affairs and Fisheres,attached to the Minister of Ecllogy,Sustainable Development and Energy of Trance,addressed the press conference in Beijing that Paris will launch a new renovation program that features a total investment of about 100 billion Euro.He welcomed Chinese companies to be involved into the investment program.展开更多
基金supported by the National Natural Science Foundation of China(No.51909252)the Fundamental Research Funds for the Central Universities(No.202061004)This work is also partly supported by the China Scholar Council.
文摘As low-cost and highly autonomous ocean observation platforms,underwater gliders encounter risks during their launch and recovery,especially when coordinating multi-glider deployments.This work focuses on cooperative path planning of an underwater glider fleet with simultaneous launch and recovery to enhance the autonomy of sampling and reduce deployment risks.Specifically,the gliders collaborate to achieve sampling considering the specified routines of interest.The overall paths to be planned are divided into four rectangular parts with the same starting point,and each glider is assigned a local sampling route.A clipped-oriented line-of-sight algorithm is proposed to ensure the coverage of the desired edges.The pitch angle of the glider is selected as the optimizing parameter to coordinate the overall progress considering the susceptibility of gliders to currents and the randomness of paths produced by complex navigational strategies.Therefore,a multi-actuation deep-Q network algorithm is proposed to ensure simultaneous launch and recovery.Simulation results demonstrate the acceptable effectiveness of the proposed method.
文摘China’s space activities began in1970.On April 24,that year Chi-na successfully launched its firstsatellite,the DFH-1,with a Chi-na-made Long March vehicle.Thiswas the prelude to China’s space ac-tivities. Up to now,China has developed7 versions of LM series launch ve-hicles and put them into use andlaunched 4 kinds of 38 varioussatellites with different purposes in-to different orbits,including 5 for-eign satellites:Asiasat 1 satellite ofAsiasat Corp.,LTD.,Pakistanipiggyback BADR-A scientific ex-
文摘The first satellite jointly developed by China and France,China-France Oceanography Satellite(CFOSAT),will be launched on a LM carrier rocket in the second half of 2018 announced at a press conference jointly held by the China National Space Administration(CNSA)and French embassy in Beijing.The satellite is being tested at a Beijingbased AIT center of CNSA.CFOSAT is an oceanic satellite supported under a joint project of CNSA and the National Center for Space Studies(CNES)of France.It will carry
文摘"The launch of the IP-Key project witnesses the commitment of both parties to further strengthen their co-operation on IP issues with a view to making a fundamental con-tribution to the innovation of their respective economies."
文摘China launches three more free trade zones Three new free trade zones(FTZ)began official operation on April 21 as China seeks to draw more international commerce.The new zones were established 18 months after the first FTZ was unveiled in the financial hub Shanghai,which was designed to help streamline the overloaded administrative approval system and encourage innovation
文摘In his recent visit to China,Mr.Alain Vidalies,minister of state for Transport,Marine Affairs and Fisheres,attached to the Minister of Ecllogy,Sustainable Development and Energy of Trance,addressed the press conference in Beijing that Paris will launch a new renovation program that features a total investment of about 100 billion Euro.He welcomed Chinese companies to be involved into the investment program.
