The paper takes reversal hexagon connecting bar mechanism which uses in colliery sump cleaner as research object, takes main performance of reversal hexagon connecting bar in loader as target and uses the idea of anti...The paper takes reversal hexagon connecting bar mechanism which uses in colliery sump cleaner as research object, takes main performance of reversal hexagon connecting bar in loader as target and uses the idea of anti request project and modern design, raises a new method of engineering design. It has proved that the method is feasibility and correct by practice.展开更多
A cross-layer design which combines adaptive modulation and coding (AMC) at the physical layer with a hybrid automatic repeat request (HARQ) protocol at the data link layer (LL) is presented, in cooperative relay syst...A cross-layer design which combines adaptive modulation and coding (AMC) at the physical layer with a hybrid automatic repeat request (HARQ) protocol at the data link layer (LL) is presented, in cooperative relay system over Nakagami-m fading channels with perfect and imperfect channel state information (CSI). In order to maximize spectral efficiency (SE) under delay and packet error rate (PER) performance constraints, a state transition model and an optimization framework with perfect CSI are presented. Then the framework is extended to cooperative relay system with imperfect CSI. The numerical results show that the scheme can achieve maximum SE while satisfying transmitting delay requirements. Compared with the imperfect CSI, the average PER with perfect CSI is much lower and the spectral efficiency is much higher.展开更多
MEMS CAD( CAD used in Micro-Electro-Mechanical System )的发展还处在一个初级阶段 ,是否能站在一个高起点上主要取决于对该领域相似问题的认识程度和对新技术的掌握程度。通过吸取传统CAD软件系统设计的经验 ,针对其中出现的几点重...MEMS CAD( CAD used in Micro-Electro-Mechanical System )的发展还处在一个初级阶段 ,是否能站在一个高起点上主要取决于对该领域相似问题的认识程度和对新技术的掌握程度。通过吸取传统CAD软件系统设计的经验 ,针对其中出现的几点重要性能 :语言无关性、平台无关性、模块的独立性、网络运用的稳定性 ,提出了构建于 CORBA( Common Object Request Broker Architecture)规范之上的分布式 MEMS展开更多
文摘The paper takes reversal hexagon connecting bar mechanism which uses in colliery sump cleaner as research object, takes main performance of reversal hexagon connecting bar in loader as target and uses the idea of anti request project and modern design, raises a new method of engineering design. It has proved that the method is feasibility and correct by practice.
基金Sponsored by the National Science and Technology Major Special Project of China (Grant No.2011ZX03003-003-02)the Natural Science Foundation of China (Grant No. 60972070)+2 种基金the Natural Science Foundation of Chongqing (Grant No. CSTC2009BA2090)the Foundation of Chongqing Educational Committee ( Grant No. KJ100514)the Special Fund of Chongqing Key Laboratory
文摘A cross-layer design which combines adaptive modulation and coding (AMC) at the physical layer with a hybrid automatic repeat request (HARQ) protocol at the data link layer (LL) is presented, in cooperative relay system over Nakagami-m fading channels with perfect and imperfect channel state information (CSI). In order to maximize spectral efficiency (SE) under delay and packet error rate (PER) performance constraints, a state transition model and an optimization framework with perfect CSI are presented. Then the framework is extended to cooperative relay system with imperfect CSI. The numerical results show that the scheme can achieve maximum SE while satisfying transmitting delay requirements. Compared with the imperfect CSI, the average PER with perfect CSI is much lower and the spectral efficiency is much higher.
文摘MEMS CAD( CAD used in Micro-Electro-Mechanical System )的发展还处在一个初级阶段 ,是否能站在一个高起点上主要取决于对该领域相似问题的认识程度和对新技术的掌握程度。通过吸取传统CAD软件系统设计的经验 ,针对其中出现的几点重要性能 :语言无关性、平台无关性、模块的独立性、网络运用的稳定性 ,提出了构建于 CORBA( Common Object Request Broker Architecture)规范之上的分布式 MEMS
