摘要：In recent years, the chaos based cryptographic algorithms have suggested some new and efficient ways to develop secure image encryption techniques, but the drawbacks of small key space and weak security in one-dimensional chaotic cryptosystems are obvious. In this paper, permutation and sub- stitution methods are incorporated to present a stronger image encryption algorithm. spatial chaotic maps are used to realize the position permutation, and to confuse the relationship between the ci- pher-image and the plain-image. The experimental results demonstrate that the suggested encryption scheme of image has the advantages of large key space and high security; moreover, the distribution of grey values of the encrypted image has a random-like behavior.

摘要：In the process of unprecedented urbanization in contemporary China, a great many of Chinese cities have witnessed a rapid expansion of urban scale to different degrees. With the continuous compilation, amendment and enforcement of urban planning, the functional structure, spatial environment, street patterns and textures and even the social aspect of cities have changed conspicuously, all of which have directly happened to the spatial forms of the dimension, or even the multi-dimension of a certain city. By describing and analyzing the structure, evolution and explicit tokens of the spatial forms of cities, this thesis attempts to set up a model of factors that affect urban forms, as well as discuss the attributes, protection, adjustment and development-potential of urban land closely associated with forms. In addition, on the basis of the professional features for urban design to participate in the modeling and construction-management of desirable spatial forms of cities, the author has put forward technical measures for quantitatively appraising and analyzing the large-scaled spatial forms of cities, thus offering technical support to municipal governments and management departments of planned construction.

摘要：Patterns of spatial development and protection form a basic category of geoscience,and redesigning them is a popular subject of research in regional sustainable development that is important for ecological civilization *** authors here report a case study of Wuhan city using the circuit theory model and minimum cumulative resistance(MCR)model to rebalance its spatial protection and *** results show the following:(1)Using the density of the gross domestic product(GDP),density of population,rate of urbanization,and access to transportation as evaluation indicators,seven core areas of development in Wuhan were identified,accounting for 59%of the total number of streets,that exhibited a “circular-satellite”spatial structure.(2)According to the importance of ecosystem services,ecological sensitivity,land use type,and slope of the terrain,the resistance surface of spatial development in Wuhan had a stereoscopic spatial form of an“inverted pyramid,”with high surroundings and a low *** area of low resistance accounted for 6.64%of the total area of Wuhan.(3)Based on coupling analysis using the MCR and spatial morphological characteristics of current,nine axes of spatial development with a total area of 427.27 km2 and eight key strategic points with a total area of 40.02 km2 were *** that were prioritized for development accounted for 9.63%of Wuhan's total area.(4)By combining the characterization of the development axis with the structure of the three-level core area,we extracted the structure of spatial development of "one heart,two wings,and three belts" in *** research framework and empirical results can provide scientific guidance for the urban spatial layout,the development of regional linkages,and ecological environmental protection in China.

摘要：Private garden is one of the three major garden styles in China,the artistic achievements of which have devoted remarkable contributions to the development of global landscape *** studying the spatial layout of private gardens,the authors further analyzed three ways of landscape layouts,specifically,separated scenery,winding scenery and borrowed *** examples were taken to demonstrate the connotations and application skills of such three layouts,in order to benefit the inheritance and development of traditional Chinese garden art.

摘要：The Story of an Hour is a short story written by Kate Chopin,an American realistic novelist,at the end of the 19th *** are three spaces in the novel,the room,the house and space outside the *** one contains certain characters,actions,emotions and even *** paper tries to analyze its Feministic significance of the novel from the perspective of space narration.

摘要：多元异构的灾害灾情数据是各种灾害信息系统的基础和核心,科学高效的管理和应用这些数据尤为重要。介绍了基于Oracle spatial的技术设计与构建多元灾害信息数据库的结构框架,分析了存储数据信息的种类、属性及特点,研究了数据的存储方式。在多元异构数据统一管理的基础上,初步实现了多元灾害信息的存储、查询、绘图及显示等功能。

摘要：The spatial composition of natural environment and settlement in the Three Gorges region along the Yangtze River was analyzed from a macro perspective,which emphasized its characteristics of the interdependence among its buildings,landform and waterscape,between buildings and landscape,and integration of nature and human *** the spatial features of folk houses were analyzed,while special attention was paid to its "upward","grey",and dynamic *** courtyard-type residence and stilted building in South China were taken as examples in order to explain their exterior spatial characteristics,and the interior spatial features were analyzed from the pursuit of courtyard layout,the preference of courtyard space and the emphasis of central room *** paper exposed the builders' rational thinking about natural environment and living place conveyed through the traditional folk houses,as well as the practical value of this architectural style in the special natural environment of the Three Gorges region,and explained the artistic achievements from the integration of architecture and environment,aiming to provide references for the urban and living environment construction in this region during the "Post Three-Gorges Project Era".

摘要：论述Oracle spatial三维空间数据模型,以存储表面的方式设计了三维模型的数据库存储方案,同时引入Hibernate对象持久化技术并自行设计开发了SDO_GEOMETRY映射类,结合Java 3D实现了三维模型的可视化。结果表明构建的存储与可视化方案可行。

摘要：随着地球重力场信息多元化的发展及其应用领域越来越广,科学高效的管理和应用重力场信息数据就显得尤为重要。文中介绍了基于Oracle spatial技术设计与构建的重力场信息数据库的结构框架,分析了存储数据信息的种类、属性及特点,研究了数据的存储方式。在多元化重力场数据与基础地图数据统一管理的基础上,初步实现了多元化重力场信息的存储、查询、计算、绘图及显示等功能。

摘要：通过分析Oralce spatial 11 g空间数据的存储结构和城市地理标记语言CityGML的数据模型,给出城市三维模型数据的存储设计和实例代码,为数字城市的三维空间数据建设提供了借鉴。