Recent advances in on-board radar and missile capabilities,combined with individual payload limitations,have led to increased interest in the use of unmanned combat aerial vehicles(UCAVs)for cooperative occupation dur...Recent advances in on-board radar and missile capabilities,combined with individual payload limitations,have led to increased interest in the use of unmanned combat aerial vehicles(UCAVs)for cooperative occupation during beyond-visual-range(BVR)air combat.However,prior research on occupational decision-making in BVR air combat has mostly been limited to one-on-one scenarios.As such,this study presents a practical cooperative occupation decision-making methodology for use with multiple UCAVs.The weapon engagement zone(WEZ)and combat geometry were first used to develop an advantage function for situational assessment of one-on-one engagement.An encircling advantage function was then designed to represent the cooperation of UCAVs,thereby establishing a cooperative occupation model.The corresponding objective function was derived from the one-on-one engagement advantage function and the encircling advantage function.The resulting model exhibited similarities to a mixed-integer nonlinear programming(MINLP)problem.As such,an improved discrete particle swarm optimization(DPSO)algorithm was used to identify a solution.The occupation process was then converted into a formation switching task as part of the cooperative occupation model.A series of simulations were conducted to verify occupational solutions in varying situations,including two-on-two engagement.Simulated results showed these solutions varied with initial conditions and weighting coefficients.This occupation process,based on formation switching,effectively demonstrates the viability of the proposed technique.These cooperative occupation results could provide a theoretical framework for subsequent research in cooperative BVR air combat.展开更多
Manned combat aerial vehicles （MCAVs）, and un-manned combat aerial vehicles （UCAVs） together form a cooper-ative engagement system to carry out operational mission, whichwill be a new air engagement style in the n...Manned combat aerial vehicles （MCAVs）, and un-manned combat aerial vehicles （UCAVs） together form a cooper-ative engagement system to carry out operational mission, whichwill be a new air engagement style in the near future. On the basisof analyzing the structure of the MCAV/UCAV cooperative engage-ment system, this paper divides the unique system into three hi-erarchical levels, respectively, i.e., mission level, task-cluster leveland task level. To solve the formation and adjustment problem ofthe latter two levels, three corresponding mathematical modelsare established. To solve these models, three algorithms calledquantum artificial bee colony （QABC） algorithm, greedy strategy（GS） and two-stage greedy strategy （TSGS） are proposed. Finally,a series of simulation experiments are designed to verify the effec-tiveness and superiority of the proposed algorithms.展开更多
Many digital platforms have employed free-content promotion strategies to deal with the high uncertainty levels regarding digital content products.However,the diversity of digital content products and user heterogenei...Many digital platforms have employed free-content promotion strategies to deal with the high uncertainty levels regarding digital content products.However,the diversity of digital content products and user heterogeneity in content preference may blur the impact of platform promotions across users and products.Therefore,free-content promotion strategies should be adapted to allocate marketing resources optimally and increase revenue.This study develops personal-ized free-content promotion strategies based on individual-level heterogeneous treatment effects and explores the causes of their heterogeneity,focusing on the moderating effect of user engagement-related variables.To this end,we utilize ran-dom field experimental data provided by a top Chinese e-book platform.We employ a framework that combines machine learning with econometric causal inference methods to estimate individual treatment effects and analyze their potential mechanisms.The analysis shows that,on average,free-content promotions lead to a significant increase in consumer pay-ments.However,the higher the level of user engagement,the lower the payment lift caused by promotions,as more-engaged users are more strongly affected by the cannibalization effect of free-content promotion.This study introduces a novel causal research design to help platforms improve their marketing strategies.展开更多
Since social media increasingly infiltrates the workplace,it may affect employee innovation.However,how so-cial media use(SMU)affects employee innovation performance remains controversial.Therefore,this study explores...Since social media increasingly infiltrates the workplace,it may affect employee innovation.However,how so-cial media use(SMU)affects employee innovation performance remains controversial.Therefore,this study explores the underlying mechanisms and boundary conditions in the relationship between SMU and employee innovation performance.The research model was tested through a survey of 221 Chinese employees.The results show that SMU is positively re-lated to employee innovation performance,with work engagement acting as a mediator in this relationship.Employee tra-ditionality positively moderates the positive impact of work-related SMU on work engagement,while traditionality has no moderating effect on the relationship between social-related SMU and work engagement.This study focuses on the rela-tionship between SMU and innovation performance based on conservation of resources theory,offering insights into the intrinsic mechanism by which SMU affects employee innovation.Furthermore,this study considers the moderating effect of employee traditionality based on social cognitive theory,enriching the knowledge of how traditionality influences the impacts of SMU.This study has theoretical implications for future research and practical guidance for enterprises regard-ing the proper use of social media.展开更多
日前，IBM发布了一个全新的基于云计算的社交网络软件包Lotus Live Engage，旨在提升企业与客户、合作伙伴以及供应链等环节沟通协作的能力．据报道，之前该工具的测试版本名称为Bluehouse，IBM消息和协作业务部门经理亚当斯（Darren Ad...日前，IBM发布了一个全新的基于云计算的社交网络软件包Lotus Live Engage，旨在提升企业与客户、合作伙伴以及供应链等环节沟通协作的能力．据报道，之前该工具的测试版本名称为Bluehouse，IBM消息和协作业务部门经理亚当斯（Darren Adams）称，该新产品可以为不具备资源建立专门协作服务的小企业提供帮助，此外还可以为大企业配合防火墙提供额外的安全保证．亚当斯还表示，Lotus Live Engage还可以提供无缝链接，例如用户可以在Lotus Notes上附加一个文档文件，展开更多
Since the founding of Beijing Forestry University(formerly BeijingForestry College)forty years ago it has undergone difficulties and hardshipsbut by insisting on the principle of producing both personnel and research ...Since the founding of Beijing Forestry University(formerly BeijingForestry College)forty years ago it has undergone difficulties and hardshipsbut by insisting on the principle of producing both personnel and research find-ings for the forest construction in China scientific research has been placed in amost important position. In 1952,at the beginning of the University’s establishment,all teachersand students were engaged in teaching and learning and administrative展开更多
This is the thirteenth in the series of Solar-Terrestrial Physics Symposia organized by the Scientific Committee on Solar-Terrestrial Physics(SCOSTEP)and held approximately every four years.SCOSTEP is engaged in three...This is the thirteenth in the series of Solar-Terrestrial Physics Symposia organized by the Scientific Committee on Solar-Terrestrial Physics(SCOSTEP)and held approximately every four years.SCOSTEP is engaged in three activities:long-term scientific programs,capacity building,and public outreach.The scientific programs are designed to advance our understanding of the solar terrestrial relationship using spaceand ground-based data,cutting-edge models,and theory.SCOSTEP programs are thus of interdisciplinary nature and involve scientists from all over the world.In 2013,the Climate and Weather in the展开更多
fter approved by the State Council,the Ministry of Finance issued Accounting Standards for Business Enterprises on November 30,1992,which will become effective as of July 1,1993,These standards are applicaple to all e...fter approved by the State Council,the Ministry of Finance issued Accounting Standards for Business Enterprises on November 30,1992,which will become effective as of July 1,1993,These standards are applicaple to all enterprises established within the territory of the People’s Republic of China and Chinese enterprises established outside the territory of the People’s Republic of Chian.In order to make the ASBE understood easily,especially for those accounting staff in enterprises with foreign investement,enterprises involved in foreign trade,financial institutions,Chinese enterprises estabished outside the territory of the People’s Republic of China,etc.to engage in accounting operations and those foreign investors to have a better understanting of Chinese accounting policies,here we present the ASBE in English version and Japanese version ny four issues respectively.展开更多
基金supported by the National Natural Science Foundation of China(No.61573286)the Aeronautical Science Foundation of China(No.20180753006)+2 种基金the Fundamental Research Funds for the Central Universities(3102019ZDHKY07)the Natural Science Foundation of Shaanxi Province(2020JQ-218)the Shaanxi Province Key Laboratory of Flight Control and Simulation Technology。
文摘Recent advances in on-board radar and missile capabilities,combined with individual payload limitations,have led to increased interest in the use of unmanned combat aerial vehicles(UCAVs)for cooperative occupation during beyond-visual-range(BVR)air combat.However,prior research on occupational decision-making in BVR air combat has mostly been limited to one-on-one scenarios.As such,this study presents a practical cooperative occupation decision-making methodology for use with multiple UCAVs.The weapon engagement zone(WEZ)and combat geometry were first used to develop an advantage function for situational assessment of one-on-one engagement.An encircling advantage function was then designed to represent the cooperation of UCAVs,thereby establishing a cooperative occupation model.The corresponding objective function was derived from the one-on-one engagement advantage function and the encircling advantage function.The resulting model exhibited similarities to a mixed-integer nonlinear programming(MINLP)problem.As such,an improved discrete particle swarm optimization(DPSO)algorithm was used to identify a solution.The occupation process was then converted into a formation switching task as part of the cooperative occupation model.A series of simulations were conducted to verify occupational solutions in varying situations,including two-on-two engagement.Simulated results showed these solutions varied with initial conditions and weighting coefficients.This occupation process,based on formation switching,effectively demonstrates the viability of the proposed technique.These cooperative occupation results could provide a theoretical framework for subsequent research in cooperative BVR air combat.
基金supported by the National Natural Science Foundation of China(61573017)the Doctoral Innovation Found of Air Force Engineering University(KGD08101604)
文摘Manned combat aerial vehicles （MCAVs）, and un-manned combat aerial vehicles （UCAVs） together form a cooper-ative engagement system to carry out operational mission, whichwill be a new air engagement style in the near future. On the basisof analyzing the structure of the MCAV/UCAV cooperative engage-ment system, this paper divides the unique system into three hi-erarchical levels, respectively, i.e., mission level, task-cluster leveland task level. To solve the formation and adjustment problem ofthe latter two levels, three corresponding mathematical modelsare established. To solve these models, three algorithms calledquantum artificial bee colony （QABC） algorithm, greedy strategy（GS） and two-stage greedy strategy （TSGS） are proposed. Finally,a series of simulation experiments are designed to verify the effec-tiveness and superiority of the proposed algorithms.
基金supported by the Anhui Postdoctoral Scientific Research Program Foundation(2022B579).
文摘Many digital platforms have employed free-content promotion strategies to deal with the high uncertainty levels regarding digital content products.However,the diversity of digital content products and user heterogeneity in content preference may blur the impact of platform promotions across users and products.Therefore,free-content promotion strategies should be adapted to allocate marketing resources optimally and increase revenue.This study develops personal-ized free-content promotion strategies based on individual-level heterogeneous treatment effects and explores the causes of their heterogeneity,focusing on the moderating effect of user engagement-related variables.To this end,we utilize ran-dom field experimental data provided by a top Chinese e-book platform.We employ a framework that combines machine learning with econometric causal inference methods to estimate individual treatment effects and analyze their potential mechanisms.The analysis shows that,on average,free-content promotions lead to a significant increase in consumer pay-ments.However,the higher the level of user engagement,the lower the payment lift caused by promotions,as more-engaged users are more strongly affected by the cannibalization effect of free-content promotion.This study introduces a novel causal research design to help platforms improve their marketing strategies.
基金supported by the National Natural Science Foundation of China(72332007)。
文摘Since social media increasingly infiltrates the workplace,it may affect employee innovation.However,how so-cial media use(SMU)affects employee innovation performance remains controversial.Therefore,this study explores the underlying mechanisms and boundary conditions in the relationship between SMU and employee innovation performance.The research model was tested through a survey of 221 Chinese employees.The results show that SMU is positively re-lated to employee innovation performance,with work engagement acting as a mediator in this relationship.Employee tra-ditionality positively moderates the positive impact of work-related SMU on work engagement,while traditionality has no moderating effect on the relationship between social-related SMU and work engagement.This study focuses on the rela-tionship between SMU and innovation performance based on conservation of resources theory,offering insights into the intrinsic mechanism by which SMU affects employee innovation.Furthermore,this study considers the moderating effect of employee traditionality based on social cognitive theory,enriching the knowledge of how traditionality influences the impacts of SMU.This study has theoretical implications for future research and practical guidance for enterprises regard-ing the proper use of social media.
文摘日前，IBM发布了一个全新的基于云计算的社交网络软件包Lotus Live Engage，旨在提升企业与客户、合作伙伴以及供应链等环节沟通协作的能力．据报道，之前该工具的测试版本名称为Bluehouse，IBM消息和协作业务部门经理亚当斯（Darren Adams）称，该新产品可以为不具备资源建立专门协作服务的小企业提供帮助，此外还可以为大企业配合防火墙提供额外的安全保证．亚当斯还表示，Lotus Live Engage还可以提供无缝链接，例如用户可以在Lotus Notes上附加一个文档文件，
文摘Since the founding of Beijing Forestry University(formerly BeijingForestry College)forty years ago it has undergone difficulties and hardshipsbut by insisting on the principle of producing both personnel and research find-ings for the forest construction in China scientific research has been placed in amost important position. In 1952,at the beginning of the University’s establishment,all teachersand students were engaged in teaching and learning and administrative
文摘This is the thirteenth in the series of Solar-Terrestrial Physics Symposia organized by the Scientific Committee on Solar-Terrestrial Physics(SCOSTEP)and held approximately every four years.SCOSTEP is engaged in three activities:long-term scientific programs,capacity building,and public outreach.The scientific programs are designed to advance our understanding of the solar terrestrial relationship using spaceand ground-based data,cutting-edge models,and theory.SCOSTEP programs are thus of interdisciplinary nature and involve scientists from all over the world.In 2013,the Climate and Weather in the
文摘fter approved by the State Council,the Ministry of Finance issued Accounting Standards for Business Enterprises on November 30,1992,which will become effective as of July 1,1993,These standards are applicaple to all enterprises established within the territory of the People’s Republic of China and Chinese enterprises established outside the territory of the People’s Republic of Chian.In order to make the ASBE understood easily,especially for those accounting staff in enterprises with foreign investement,enterprises involved in foreign trade,financial institutions,Chinese enterprises estabished outside the territory of the People’s Republic of China,etc.to engage in accounting operations and those foreign investors to have a better understanting of Chinese accounting policies,here we present the ASBE in English version and Japanese version ny four issues respectively.
