吐哈群艺馆院落空间的设计构思

通过对群艺馆院落空间的设计,分析了构成本建筑院落空间的两个基本要素——围合与流动。     

空间相机自准法检焦原理及数据处理方法研究

为了对空间相机实时进行检调焦 ,本文介绍了一种自准法检焦系统的原理 ,并对测量数据的处理方法进行了分析。仿真实验结果表明信号的相关处理法和质心探测法在较低的信噪比下具有很高的测量精度和重复性。     

巴蜀城池空间环境营造探讨 ——基于清代历史方志的分析研究

明清时期城市发展出现一次新的高潮,巴蜀地域在经历了长达数十载的兵燹之乱后掀起大规模的城市重建活动。在清代官方主导编修的各类地方志书中,图文并茂地记录了大量与城池营造相关的历史信息,为研究这一时期巴蜀城池空间环境营造提供了可靠的研究物料和重要佐证。通过地方志中历史舆图与文字记载的解析、梳理,从城池的选址布局、空间架构、景观塑造三方面入手,探讨清代巴蜀城池空间环境营造的典型规律和地域特征,既能丰富古代城池空间环境营造的研究视角,也能为当前的城市规划建设提供有益启示。     

城市道路交叉口空间的可识别性

城市是人们的家园,是人们心理上的依托,它的可识别性使人们产生了归属感。城市道路交叉口空司是人们城市生活的必经之处,并常常成为人们“心智地图”的重要承载点。以此为切入点,探讨了增强空间可识别性的手段,根据认识的深度,分别从“特征”、“秩序”、“意义”三个层面进行了论述。     

关于信息过滤模型的探讨

信息过滤技术已是当今信息技术研究的热点。该文主要是针对信息过滤模型的研究,介绍了布尔模型、向量空间模型和潜在语义索引三种信息过滤模型。并就其概念、方法和意义进行了分析和讨论。     

面向时间同步业务的空间信息网络拓扑聚合图模型

空间信息网络的发展呈现出节点异构和功能多样化趋势,网络节点间的时间同步是实现协同任务的重要技术基础。论文对空间信息网络的时间同步业务特性进行了分析,并提出基于多跳中继的时间同步误差模型。针对非实时时间同步业务特点,提出了钟差相对不变性概念,并基于此提出了面向时间同步业务的空间信息网络拓扑聚合图模型。不同于面向通信业务的网络拓扑模型,该模型的建立以节点时钟性能和时间比对链路性能为约束条件,反映了时间同步业务的特性和需求。针对该模型进行了空间信息网络时间同步仿真实验,实验结果表明基于该模型进行多跳中继时间同步,可以减少时间同步过程的路由筛选及建链次数,降低时间同步业务的链路资源消耗,同时可以达到更高的时间同步精度。     

基于知识的数控弯管干涉回避算法

数控弯管成形过程中的干涉问题主要是由辅助运动指令的设置引起的,为此建立了基于数控指令的回避操作的姿态空间定义。提出基于姿态空间单元分割的干涉回避算法,并在此基础上提出基于模糊逻辑规则知识的启发式搜索算法,可根据干涉状态采用启发式知识进行模糊推理,以选择最优搜索空间;设计了模糊知识的自学习机制,实现了知识库的编辑和管理。经100余件导管零件的实际生产使用,干涉检测没有发现误判和漏判,实际应用中取得了很好的效果。     

Multiple resources and their sustainable development in Urban Underground Space

Traffic congestion and ground space scarcity are increasing the need to find more space in the urban underground. The demand-driven “top-down” planning of Urban Underground Space (UUS) is common worldwide. As natural resource, the endowments of UUS are different in different regions. Consideration of UUS resource endowments, which can be called “bottom-up” thinking, should be integrated into planning. The evaluation method of UUS resource and investigation results in typical cases are being presented in the paper. It is important for urban development to utilize the underground space. Meanwhile, we should also be aware that there are multiple valuable resources in urban underground. Besides space, there are also water, energy and geo-materials. The paper will discuss how to consider these different resources in urban development. There might be conflicts between the developments of different urban underground resources. The paper investigated the interactions between these developments, revealed some serious impacts and typical conflict modes. The identification of conflicts is a basis for the coordination and synergy of these developments. For sustainable development of city, it is needed to understand and scientifically evaluate the multiple urban underground resources, then holistically plan and manage the developments. Structure and properties of urban underground geological body determine the engineering conditions of UUS and resource attributes of urban underground. Since 2003, China has been conducting pilot projects of Urban Geological Investigation (UGI) programs in some large cities. The paper will also show how to consider the influence of geological conditions in urban underground resource evaluation and UUS planning.     

Robonaut: a robot designed to work with humans in space

The Robotics Technology Branch at the NASA Johnson Space Center is developing robotic systems to assist astronauts in space. One such system, Robonaut, is a humanoid robot with the dexterity approaching that of a suited astronaut. Robonaut currently has two dexterous arms and hands, a three degree-of-freedom articulating waist, and a two degree-of-freedom neck used as a camera and sensor platform. In contrast to other space manipulator systems, Robonaut is designed to work within existing corridors and use the same tools as space walking astronauts. Robonaut is envisioned as working with astronauts, both autonomously and by teleoperation, performing a variety of tasks including, routine maintenance, setting up and breaking down worksites, assisting crew members while outside of spacecraft, and serving in a rapid response capacity.     

基于非线性预编码的多载波分层空时检测方法*

该文针对多载波分层空时方案传统检测存在误层传输效应及复杂度高的问题,提出了一种基于非线性预编码的多载波分层空时检测方法。该方法首先对反馈信道状态信息采用几何均值分解获得各子信道具有相同等效噪声增益的预编码矩阵,再在发射端多载波CDMA子载波信道间进行非线性模代数THP预编码,可以有效地消除传统分层空时检测的误层传输效应,在接收端分别采用迫零与最小均方误差准则,降低了下行接收机的复杂度。文中对该方法的性能进行分析并仿真,仿真结果表明本文所提出的方法比传统方法有效改善了系统的误码性能,并在一定程度上降低了接收机的复杂度。