Visual Basic是一种被大家熟知和应用的数据库开发软件,它具有简单、灵活、可扩充性强等优点,具有支持Active X Data Object数据对象存取模式、支持OLE数据库和组件对象模型、针对不同的数据库可以开发完善的客户机/服务器应用程序、管...Visual Basic是一种被大家熟知和应用的数据库开发软件,它具有简单、灵活、可扩充性强等优点,具有支持Active X Data Object数据对象存取模式、支持OLE数据库和组件对象模型、针对不同的数据库可以开发完善的客户机/服务器应用程序、管理数据源和创建服务器端控件、提供Data Report Designer设计工具及可以进行ODBC开发的API函数,支持多层数据库应用程序开发等一系列优质的特征。展开更多
The space manipulator which has advantages of high dexterity and universality, is used to the space capturing usually. According to the different types of mechanical interfaces of targets, the on orbit capturing opera...The space manipulator which has advantages of high dexterity and universality, is used to the space capturing usually. According to the different types of mechanical interfaces of targets, the on orbit capturing operation includes capturing of cooperative target and capturing of uncooperative target. The performances of the famous large space manipulators named space shuttle remote manipulator system(SRMS), the space station remote manipulator system(SSRMS) and the Europe robotic arm(ERA) are reviewed and studied respectively. Moreover, the space manipulators being developed by China for space station is also surveyed. Based on the performance analysis of the large space manipulators and end-effectors, which are adapted to the construction and daily maintenance for the large space structure such as the space station, the basic requirements of large misalignment tolerance capability, soft capturing capability and hard docking capability for the end-effector of large space manipulator are proposed in this paper. According to these requirements, the capture mechanism and methods that can enable the end-effector to have the capability of misalignment tolerance and soft capturing are presented. The development trend and key technologies of the large space manipulators and the end-effectors are also reviewed.展开更多
Gene regulatory networks （GRNs） control the production of proteins in cells. It is well-known that this process is not deterministic. Numerous studies employed a non- deterministic transition structure to model thes...Gene regulatory networks （GRNs） control the production of proteins in cells. It is well-known that this process is not deterministic. Numerous studies employed a non- deterministic transition structure to model these networks. However, it is not realistic to expect state-to-state transition probabilities to remain constant throughout an organ- ism＇s lifetime. In this work, we focus on modeling GRN state transition （edge） variability using an ever-changing set of propensities. We suspect that the source of this variation is due to internal noise at the molecular level and can be modeled by introducing addi- tional stochasticity into GRN models. We employ a beta distribution, whose parameters are estimated to capture the pattern inherent in edge behavior with minimum error. Additionally, we develop a method for obtaining propensities from a pre-determined network.展开更多
文摘Visual Basic是一种被大家熟知和应用的数据库开发软件,它具有简单、灵活、可扩充性强等优点,具有支持Active X Data Object数据对象存取模式、支持OLE数据库和组件对象模型、针对不同的数据库可以开发完善的客户机/服务器应用程序、管理数据源和创建服务器端控件、提供Data Report Designer设计工具及可以进行ODBC开发的API函数,支持多层数据库应用程序开发等一系列优质的特征。
基金supported by the National Basic Research Program of China(Grant No.973-2013CB733103)State Key Laboratory of Robotics and System(HIT)(Grant No.SKLRS-2016-MF-05)
文摘The space manipulator which has advantages of high dexterity and universality, is used to the space capturing usually. According to the different types of mechanical interfaces of targets, the on orbit capturing operation includes capturing of cooperative target and capturing of uncooperative target. The performances of the famous large space manipulators named space shuttle remote manipulator system(SRMS), the space station remote manipulator system(SSRMS) and the Europe robotic arm(ERA) are reviewed and studied respectively. Moreover, the space manipulators being developed by China for space station is also surveyed. Based on the performance analysis of the large space manipulators and end-effectors, which are adapted to the construction and daily maintenance for the large space structure such as the space station, the basic requirements of large misalignment tolerance capability, soft capturing capability and hard docking capability for the end-effector of large space manipulator are proposed in this paper. According to these requirements, the capture mechanism and methods that can enable the end-effector to have the capability of misalignment tolerance and soft capturing are presented. The development trend and key technologies of the large space manipulators and the end-effectors are also reviewed.
文摘Gene regulatory networks （GRNs） control the production of proteins in cells. It is well-known that this process is not deterministic. Numerous studies employed a non- deterministic transition structure to model these networks. However, it is not realistic to expect state-to-state transition probabilities to remain constant throughout an organ- ism＇s lifetime. In this work, we focus on modeling GRN state transition （edge） variability using an ever-changing set of propensities. We suspect that the source of this variation is due to internal noise at the molecular level and can be modeled by introducing addi- tional stochasticity into GRN models. We employ a beta distribution, whose parameters are estimated to capture the pattern inherent in edge behavior with minimum error. Additionally, we develop a method for obtaining propensities from a pre-determined network.
