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关键词： 分布式仿真   二层体系结构   实时性   可伸缩性  

摘要： 针对传统分布式仿真I/O体系结构的缺陷,设计了一种分布式仿真二层I/O体系结构,该结构在物理上实现了单点对多点的数据传输控制,扩展了对多路通道存取型显示设备的支持,有效降低了硬连线路的复杂程度,保证了设备显示频率,具有实时性和可伸缩性的良好特征,很好地满足了仿真平台的设计需要。

关键词： KDD   Data mining   Conceptual modelling   Structurally complex data   Time series   UML profiles  

摘要： Context: Domains where data have a complex structure requiring new approaches for knowledge discovery from data are on the increase. In such domains, the information related to each object under analysis may be composed of a very broad set of interrelated data instead of being represented by a simple attribute table. This further complicates their analysis. Objective: It is becoming more and more necessary to model data before analysis in order to assure that they are properly understood, stored and later processed. On this ground, we have proposed a UML extension that is able to represent any set of structurally complex hierarchically ordered data. Conceptually modelled data are human comprehensible and constitute the starting point for automating other data analysis tasks, such as comparing items or generating reference models. Method: The proposed notation has been applied to structurally complex data from the stabilometry field. Stabilometry is a medical discipline concerned with human balance. We have organized the model data through an implementation based on XML syntax. Results: We have applied data mining techniques to the resulting structured data for knowledge discovery. The sound results of modelling a domain with such complex and wide-ranging data confirm the utility of the approach. Conclusion: The conceptual modelling and the analysis of non-conventional data are important challenges. We have proposed a UML profile that has been tested on data from a medical domain, obtaining very satisfactory results. The notation is useful for understanding domain data and automating knowledge discovery tasks. (C) 2013 Elsevier B.V. All rights reserved.

关键词： Low-rank approximation   Total least squares   Structured matrix   Variable projection   Missing data   System identification   Reproducible research   Literate programming   noweb  

摘要： Rank deficiency of a data matrix is equivalent to the existence of an exact linear model for the data. For the purpose of linear static modeling, the matrix is unstructured and the corresponding modeling problem is an approximation of the matrix by another matrix of a lower rank. In the context of linear time-invariant dynamic models, the appropriate data matrix is Hankel and the corresponding modeling problems becomes structured low-rank approximation. Low-rank approximation has applications in: system identification;signal processing, machine learning, and computer algebra, where different types of structure and constraints occur. This paper gives an overview of recent progress in efficient local optimization algorithms for solving weighted mosaic-Hankel structured low-rank approximation problems. In addition, the data matrix may have missing elements and elements may be specified as exact. The described algorithms are implemented in a publicly available software package. Their application to system identification, approximate common divisor, and data-driven simulation problems is described in this paper and is illustrated by reproducible simulation examples. As a data modeling paradigm the low-rank approximation setting is closely related to the behavioral approach in systems and control, total least squares, errors-in-variables modeling, principal component analysis, and rank minimization. (C) 2013 Elsevier B.V. All rights reserved.

关键词： UML profile   MDA   XLink   Software engineering   Cloud computing  

摘要： Current XML editors do not provide conceptual modeling for XLink. This leads to inefficient development processes, and a low potential for reuse. To address these shortcomings, this study presents a Model Driven Architecture (MDA) approach with the UML profile to build XLink applications for various domains. This investigation demonstrates how users can use the UML profile to provide a conceptual and visual modeling for XLink applications, and automatically generate different XLink-based documents for various domains. The proposed methodology enables Web-based system developers to generate relationships between resources, and to improve software quality by adopting software engineering techniques in XML development. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.

关键词： Tendons  

摘要： Surgical reconstruction of large tendon defects is technically demanding. Tissue engineering is a new option. We produced a novel tissue engineered, collagen based, bioimplant and in vitro characterizations of the implant were investigated. In addition, we investigated role of the collagen implant on the healing of a large tendon defect model in rabbits. A two cm length of the left rabbit's Achilles tendon was transected and discarded. The injured tendons of all the rabbits were repaired by Kessler pattern to create and maintain a 2 cm tendon gap. The collagen implant was inserted in the tendon defect of the treatment group (n = 30). The defect area was left intact in the control group (n = 30). The animals were euthanized at 60 days post injury (DPI) and the macro- micro- and nano- morphologies and the biomechanical characteristics of the tendon samples were studied. Differences of P < 0.05 were considered significant. The host graft interaction was followed at various stages of tendon healing, using pilot animals. At 60 DPI, a significant increase in number, diameter and density of the collagen fibrils, number and maturity of tenoblasts and tenocytes, alignment of the collagen fibrils and maturity of the elastic fibers were seen in the treated tendons when compared to the control ones (P < 0.05). Compared to the control lesions, number of inflammatory cells, amount of peritendinous adhesions and muscle fibrosis and atrophy, were significantly lower in the treated lesions (P < 0.05). Treatment also significantly increased load to failure, tensile strength and elastic modulus of the samples as compared with the control ones. The collagen implant properly incorporated with the healing tissue and was replaced by the new tendinous structure which was superior both ultra-structurally and physically than the loose areolar connective tissue regenerated in the control lesions. The results of this study may be valuable in the clinical practice.

关键词： OPAC系统   系统原型   UML建模   系统分析   系统设计  

摘要： 为了高效地开发图书馆OPAC系统,将UML建模技术应用于OPAC系统的分析和设计中。首先提出了基于系统原型的UML系统分析和设计方法,其次通过用例建模、类建模、活动建模、交互建模和状态建模分析了系统的静态结构和动态行为,最后通过架构设计、用例包设计、类包设计、构件设计、部署设计设计了系统的技术解决方案并完成了业务模型到技术模型的映射。项目结果分析和成功实施表明提出的系统分析和设计方法是开发图书馆OPAC系统的一个有效的解决方案。

关键词： 机电一体化   控制系统   开放体系   结构设计  

摘要： 从机电一体化的发展历程可以看出,机电一体化的发展是适合时代发展要求的集成化发展过程,机电一体化控制系统的开放体系研究凭借其能够自由移植以及可交换性等优势,为机电一体化控制系统开发体系提供了更为广泛的发展空间。

关键词： electrocatalysis   hydrogen production   outer coordination sphere   peptide catalysis   synthetic enzymes  

摘要： Catalytic, peptide-containing metal complexes with a well-defined peptide structure have the potential to enhance molecular catalysts through an enzyme-like outer coordination sphere. Here, we report the synthesis and characterization of an active, peptide-based metal complex built upon the well-characterized hydrogen production catalyst [Ni((P2NPh)-N-Ph)(2)](2+) ((P2NPh)-N-Ph = 1,3,6-triphenyl-1-aza-3,6-diphosphacycloheptane). The incorporated peptide maintains its beta-hairpin structure when appended to the metal core, and the electrocatalytic activity of the peptide-based metal complex (approximate to 100,000 s(-1)) is enhanced compared to the parent complex ([Ni((P2NAPPA)-N-Ph)(2)](2+);approximate to 50,500 s(-1)). The combination of an active molecular catalyst with a structured peptide provides a scaffold that permits the incorporation of features of an enzyme-like outer-coordination sphere necessary to create molecular electrocatalysts with enhanced functionality.

关键词： 中国电力科学研究院   安全测试   宽带系统   无线宽带   信息通信系统   体系结构设计   安全防护能力   重点实验室  

摘要： 2014年1月2013至2月12日，国网信息通信分公司电力信息通信系统运行技术重点实验室开发的电力无线宽带TD-LTE230系统，通过了国网信息通信分公司和中国电力科学研究院联合组织的安全性测试测试结果表明，该系统总体安全体系结构设计完善，可有效防范伪基站和伪终端的侵入，安全防护能力满足智能电网应用要求，将为电力无线专用通信网的拓展提供更加可靠、灵活和先进的手段。