共查询到20条相似文献，搜索用时 156 毫秒
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杲亮 《内蒙古科技与经济》2010,(19):152-153
文章对知识社区的概念、作用及当前研究的进展作了阐述,并从成员组件、信息资源组件、行为组件、信息服务组件、实体组件和社区秩序管理组件等几方面对知识社区组件作了研究。 相似文献
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《内蒙古科技与经济》2021,(10)
分析了集团专线业务开通设备使用存在的问题,阐述了小型化PTN开通集团专线业务的几种方案,介绍了小型化PTN如何实现统计监控,以保证实现资源管理、维护管理等功能,并对小型化PTN的应用前景进行了展望。 相似文献
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高压开关设备的组合化主要基于小型化技术,最重要的目的是可以实现体积小、具成套性、可靠性高、少维护、易于安装、抗严酷环境等功能。由于对各元件和各部位都采取小型化措施以及整体的小型化布置,因此高压开关组合电器的尺寸不断减小。 相似文献
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以高度体系结构为中心的组件方法是现代软件开发的重要方法之一。开发高可靠、高稳定的动态软件系统是目前组件方法开发的重要领域。动态组件软件系统的核心是动态组件依赖关系,在基于分层业务组件方法上,提出了对动态组件依赖关系进行分析、整理、管理的一些思路、策略,为动态系统开发提供了新的可选方法。 相似文献
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激光技术是高科技的产物,其产生又推动了科学研究的深入发展,并开拓出许多新的学科领域,激光在电子工业中也得到广泛应用。 相似文献
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Yi-Feng Wang Chunqiu Zhang Keni Yang Yufei Wang Shaobo Shan Yan Yan Kenneth A Dawson Chen Wang Xing-Jie Liang 《国家科学评论(英文版)》2021,8(6)
Liposomes, especially cationic liposomes, are the most common and well-investigated nanocarriers for biomedical applications, such as drug and gene delivery. Like other types of nanomaterials, once liposomes are incubated in a biological milieu, their surface can be immediately cloaked by biological components to form a protein corona, which confers a new ‘biological identity’ and modulates downstream interactions with cells. However, it remains unclear how the protein corona affects the transportation mechanism after liposomes interact with cells. Here, we employed home-made aggregation-induced-emission-visualized nanoliposomes TR4@Lipo as a model to investigate transportation with or without the protein corona by optical imaging techniques. The results show that the protein corona can change the cellular transportation mechanism of TR4@Lipo from energy-independent membrane fusion to energy-dependent endocytosis. The protein corona also modulates the intracellular distribution of loaded cargoes. This knowledge furthers our understanding of bio-nano interactions and is important for the efficient use of cationic liposomes. 相似文献
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Xin Tao Shaochun Yuan Fan Chen Xiaoman Gao Xinli Wang Wenjuan Yu Song Liu Ziwen Huang Shangwu Chen Anlong Xu 《国家科学评论(英文版)》2020,7(2):403
The discovery of ProtoRAG in amphioxus indicated that vertebrate RAG recombinases originated from an ancient transposon. However, the sequences of ProtoRAG terminal inverted repeats (TIRs) were obviously dissimilar to the consensus sequence of mouse 12/23RSS and recombination mediated by ProtoRAG or RAG made them incompatible with each other. Thus, it is difficult to determine whether or how 12/23RSS persisted in the vertebrate RAG system that evolved from the TIRs of ancient RAG transposons. Here, we found that the activity of ProtoRAG is highly dependent on its asymmetric 5′TIR and 3′TIR, which are composed of conserved TR1 and TR5 elements and a partially conserved TRsp element of 27/31 bp to separate them. Similar to the requirements for the recombination signal sequences (RSSs) of RAG recombinase, the first CAC in TR1, the three dinucleotides in TR5 and the specific length of the partially conserved TRsp are important for the efficient recombination activity of ProtoRAG. In addition, the homologous sequences flanking the signal sequences facilitate ProtoRAG- but not RAG-mediated recombination. In addition to the diverged TIRs, two differentiated functional domains in BbRAG1L were defined to coordinate with the divergence between TIRs and RSSs. One of these is the CTT* domain, which facilitates the specific TIR recognition of the BbRAGL complex, and the other is NBD*, which is responsible for DNA binding and the protein stabilization of the BbRAGL complex. Thus, our findings reveal that the functional requirement for ProtoRAG TIRs is similar to that for RSS in RAG-mediated recombination, which not only supports the common origin of ProtoRAG TIRs and RSSs from the asymmetric TIRs of ancient RAG transposons, but also reveals the development of RAG and RAG-like machineries during chordate evolution. 相似文献
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本文提出了基于ZigBee技术的面向农作物的无线传感器网络监测系统的设计方案,其中硬件子系统包括四大部分：处理器模块、无线通信模块、传感器模块和电源模块;软件子系统涉及开发平台Tiny0S系统、CC2420驱动设计、串口和内网通信程序设计和传感器数据采集模块设计。系统具有良好的灵活性、可维护性和可扩展性,同时系统模块化、开放式的结构使系统具有良好的可移植性。 相似文献
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Document classification, with the blooming of the Internet information delivery, has become indispensable required and is expected to be disposed by an automatic text categorization. This paper presents a text categorization system to solve the multi-class categorization problem. The system consists of two modules: the processing module and the classifying module. In the first module, ICF and Uni are used as the indictors to extract the relevant terms. While the fuzzy set theory is incorporated into the OAA-SVM in the classifying module, we specifically propose an OAA-FSVM classifier to implement a multi-class classification system. The performances of OAA-SVM and OAA-FSVM are evaluated by macro-average performance index. 相似文献
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The problem considered here is the optimal scheduling of a Boolean expression on a single-processor system. We consider a Boolean expression in which each Boolean variable represents the binary outcome (or return code) of a program module. The result of the expression may be known without executing all modules (e.g. an OR-operation is terminated as soon as one of the operands returns the value 1), so that the order in which the modules are executed influences the cost involved in finding the result. The optimisation discussed here consists in finding the operand arrangement that minimizes the average execution cost. The cost of each module represents the consumption of resources such as CPU time, elapsed time, number of input-outputs, etc. The assumptions regarding the modules are: (i) No module execution is the pre-requisite for the execution of another module. (ii) At each execution, the return code and the cost of a module do not depend on the sequence of execution. (iii) Over a number of executions, the return code and the cost of a module may be statistically dependent or a deterministic function of return codes and costs of other modules.A prototype scheduler is presented, that implements a sub-optimal strategy. It stores the Boolean expression in tabular form, passes control to a module at a time, as needed for the Boolean computation, measures the cost of execution and decides empirically what operand arrangement is more advantageous. 相似文献
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为了更好地提高教师的教学水平,近年来,我国很多师范类大学非常重视对学生教学技能的培养,纷纷采用微格教学培养模式和传统教学培养模式训练师范生的教学技能。笔者对这两种模式进行了比较研究,试图从中找出师范生教学技能培养的最佳模式。 相似文献