摘要：Through reviewing theories and practices of international garden heritages conservation since the 19th century and summarizing experiences of previous studies,feature maintenance and style restoration of landscape heritages were studied,and corresponding protection measures and strategies were put forward.

摘要：The sustainability of the planning and design goals of urban green land and that of its maintenance and management are mutually related and act as an organic whole. For a long time, the independence of the two is more prominent than their organic connection. This research has made preliminary considerations from three aspects. First, it concerns infusing the concept of ecology, contemplating and demonstrating space, as well as reducing the incidence of plant diseases and insect pests of urban green land. Second, the arrangement of flowers and trees for the planning and design of urban green land should comply with the biological attributes of flowers and trees to realize the organic unification of biological and scenic attributes of flowers and trees. Third, the planning and design of urban green land should attach importance to the organic unification of biological and scenic attributes of lawn grass seeds and reduce the difficulty of maintaining lawn. This research attempts to reduce the pressure of maintaining urban green land from the beginning, i.e. the planning and design of urban green land. It also tries to reduce the cost of maintenance and management to the realize planning and design goals of urban green land and the sustainability concerning its maintenance and management and arrive at the mutual unification of the planning and design as well as maintenance and management of urban green land.

摘要：Cylinder valves are the most important parts of a reciprocating compressor; their working condition affects the safety and operation of the reciprocating compressor directly. In initial design, it is dedicated to simulate the behaviour of a reciprocating compressor and peorformance of cylinder valves. For hydrogen application, it is considering carefully the real operating conditions both from the dynamic point of view and taking care of the effective condi- tions of the gas purity. The dynamic aspects of the design are related to the mechanical behaviour and to the conse- quent fatigue. The mathematical models are able to determine the ring displacement and the flow and pressure drop of the gas. Instruments are available for on-line monitoring of the reciprocating compressor. The various parts have to be repaired in time in case they have abrupt problems during the operating period. By detail design and maintenance, saving the quantities of spare parts, the reciprocating compressor of the plant can be running smoothly. Actually, the cylinder valves can be used nearly three years.

摘要：航天运输技术是体现国家航天实力的重要标志,是实现进出空间的重要基础.经过几十年的发展,一次性运载火箭技术已经相对成熟,但仍面临着高可靠、高安全、低成本、快速发射、提升运载能力等挑战.重复使用航天运输系统是指能够实现往返于宇宙空间和地球之间,或在外层空间轨道之间飞行,执行任务后可返回地面,并可以多次使用的航天运输系统,如图1所示.重复使用航天运输系统技术的发展一直是航天运输领域研究的热点和难点.通过采用重复使用设计理念和简易发射方式,能够有效缩短发射周期、提高发射灵活性,同时基于多次重复使用、费用均摊的原则,可以大幅降低发射费用,最终实现低成本自由进出空间、高效利用空间、和平开发空间.

摘要：Cloud Computing is an emerging technology for processing and storing very large amounts of data. Sometimes anomalies and defects affect part of the cloud infrastructure, resulting in a performance degradation of the cloud. This paper proposes a performance measurement framework for Cloud Computing systems, which integrates software quality concepts from ISO 25010.

摘要：Detecting well-known design patterns in object-oriented program source code can help maintainers understand the design of a program. Through the detection, the understandability, maintainability, and reusability of object-oriented programs can be improved. There are automated detection techniques;however, many existing techniques are based on static analysis and use strict conditions composed on class structure data. Hence, it is difficult for them to detect and distinguish design patterns in which the class structures are similar. Moreover, it is difficult for them to deal with diversity in design pattern applications. To solve these problems in existing techniques, we propose a design pattern detection technique using source code metrics and machine learning. Our technique judges candidates for the roles that compose design patterns by using machine learning and measurements of several metrics, and it detects design patterns by analyzing the relations between candidates. It suppresses false negatives and distinguishes patterns in which the class structures are similar. As a result of experimental evaluations with a set of programs, we confirmed that our technique is more accurate than two conventional techniques.

摘要：This work describes the retro-analysis of design of rehabilitation of existing bridge over the river Cubiculo on BR-101 in Santa Catarina, Brazil, aiming to evaluate the intervention processes. In this way, it was verified that the project adopted for strengthening of the structure was not adequate to support the evolution of the maximum load over time and the overload due to widening, and it was also verified that the changes in the load factor do not comply with the update of the Brazilian Technical Standards ABNT： NBR-7188 [1]. The retro-analysis of the bridge rehabilitation project has demonstrated fundamental importance to avoid possible design failings, accidents, and reworks. Affirming that it is essential to comply with Standards and Technical Manuals on the elaboration of the rehabilitation project of structures and in choosing the type of intervention to the existing structure.

摘要：当前的无线通信网络,通常由4级节点组成,从上到下分为:操作维护计算机(OMC)、基站控制器(BSC)、基站(BS)和移动终端(MS);OMC控制着BSC,而BSC控制着BS,BS和最末端的移动站(MS)相连;OMC控制着整个网络的运行状态,而重同步又是一种最重要的状态控制;它是BSC每隔一定的时间间隔向OMC报告网络的运行状态,这些状态包括告警(Alarm)和状态变化(State)信息,网络管理人员根据这些状态信息对全网的运行情况进行监控;从设备演变的几个版本来看,重同步的设计要求是:在基本负荷下,要在70s左右完成重同步过程;而在操作负荷下要在100s左右完成重同步过程;但这次升级后的版本在现场测试中发现重同步的时间是303s;针对这个问题,采用理论分析和实验室实际测试的方法,逐步对重同步的各个环节进行分析,最终发现了软件设计缺陷,并提出了实际的改进方案,纠正了这个设计缺陷。

摘要：以目前航空部门普遍采用的DELMIA软件为平台,介绍了虚拟维修技术在飞机维修性设计中的作用,阐述了基于DELMIA软件的交互式虚拟维修流程,以及其中的虚拟场景构建、维修仿真过程和维修性分析、评价技术。

摘要：深入分析了装备维修系统的建模要素,研究了应用Flexsim进行装备维修系统仿真的基本流程和建模方法。通过对某型通信装备维修系统的实例分析,找出了影响该维修系统运行效率的瓶颈环节,并进行了优化设置。仿真结果表明,基于Flexsim的仿真方法能够有效评价和优化装备维修系统的配置,且具有高度可视化的特点。