Information Space and Information Process: Genesis and Evolution

In this article,the phenomenon of“information space”and its methods of study,its types,elementary structure and qualitative characteristics are discussed,the author’s definition of the concept of“information”is given,the structure of the information process,and the phases,which are the basis for the evolution of the information space and the universe of human activity,are considered.

Information space of sensor networks:Lagrangian,energy-momentum tensor,and applications

It is a challenge to investigate the interrelationship between the geometric structure and performance of sensor networks due to the increasingly complex and diverse architecture of them.This paper presents two new formulations for the information space of sensor networks,including Lagrangian and energy–momentum tensor,which are expected to integrate sensor networks target tracking and performance evaluation from a unified perspective.The proposed method presents two geometric objects to represent the dynamic state and manifold structure of the information space of sensor networks.Based on that,the authors conduct the property analysis and target tracking of sensor networks.To the best of our knowledge,it is the first time to investigate and analyze the information energy-momentum tensor of sensor networks and evaluate the performance of sensor networks in the context of target tracking.Simulations and examples confirm the competitive performance of the proposed method.

Review of space information technology

The features of information technology （IT） are discussed first. On this basis, the features of space information technology （SIT） are presented and SIT is elaborated in five categories. The popularization of SIT is an informatization process and will promote the industrialization of national economy and the modernization of industry such as agriculture. The necessity of the synthetical application of SIT is studied emphatically, and the development trend of SIT is discussed.

Interruption Tolerance Routing Strategy for Space Information Network

Frequent inter-satellite link(ISL)handovers will induce service interruption in large-scale space information networks,since traditional distributed/centralized routing strategy-based route convergence/update will consume considerable time(compared with ground networks)derived from long ISL delay and flooding between hundreds or even thousands of satellites.During the network convergence/update stage,the lack of up-to-date forwarding information may cause severe packet loss.Considering the fact that ISL handovers for close-to-earth constellation are predictable and all the ISL handover information could be stored in each satellite during the network initialization,we propose a self-update routing scheme based on open shortest path first(OSPF-SUR)to address the slow route convergence problem caused by frequent ISL handovers.First,for predictable ISL handovers,forwarding tables are updated according to locally stored ISL handover information without link state advertisement(LSA)flooding.Second,for unexpected ISL failures,flooding could be triggered to complete route convergence.In this manner,network convergence time is radically descended by avoiding unnecessary LSA flooding for predictable ISL handovers.Simulation results show that the average packet loss rate caused by ISL handovers is reduced by 90.5%and 61.3%compared with standard OSPF(with three Hello packets confirmation)and OSPF based on interface state(without three Hello packets confirmation),respectively,during a period of topology handover.And the average endto-end delay is also decreased by 47.6%,9.6%,respectively.The packet loss rate of the proposed OSPF-SUR does not change along with the increase of the frequency of topology handovers.

Design for the simulation of space based information network

Ongoing research is described that is focused upon modelling the space base information network and simulating its behaviours： simulation of spaced based communications and networking project. Its objective is to demonstrate the feasibility of producing a tool that can provide a performance evaluation of various eonstellation access techniques and routing policies. The architecture and design of the simulation system are explored. The algorithm of data routing and instrument scheduling in this project is described. Besides these, the key methodologies of simulating the inter-satellite link features in the data transmissions are also discussed. The performance of both instrument scheduling algorithm and routing schemes is evaluated and analyzed through extensive simulations under a typical scenario.

Call for Papers International Conference on Space Information Technology

Sponsored by China Academy of Space Technology （ CAST）Co-sponsored by The Second Academy of China Aerospace Science and Industry Corporation

Call for Papers International Conference on Space Information Technology

(November 2009 Beijing, China) STUDY THE TECHNOLOGY OF SPACE INFORMATION EXPLORE THE FUTURE OF HUMAN KINDSponsored by China Academy of Space Technology (CAST) Co-sponsored by The Second Academy of China Aerospace Science and

Sub-Saharan Countries in the Age of Informational Globalization： On Preservation of Cultural Identity

The paper is devoted to the problem of the development of information technologies in Sub-Saharan countries. The author comes to a conclusion that the up-to-date level of the development of information technologies in Sub-Saharan countries doesn＇t give us an opportunity to estimate the close equal integration of the region into the global information and communication space. African countries don＇t have appropriate financial and technological resources which seem to be necessary when creating the well-developed information and telecommunication infrastructure on their territory. The author argues that in order to reach the level of the development of well-developed nations African states are forced to seek the aid of Western countries which use the technological and financial dependence of their African partners as the strong instrument of preservation of their influence in the region. In current circumstances it would be very difficult for Afxican countries to create a self-reliant information society and to preserve their cultural identity in the upcoming information age.

Optimization Strategies of Urban Informal Commercial Space under Demand Orientation

Commercial behavior in towns and cities is mainly divided into formal and informal behavior.Rapid urbanization has enabled formal commerce to develop more and more perfectly in towns,basically meeting the living needs of residents. However, because of problems such as urban history and management mechanism, informal commercial behavior formed by floating stallholders and other employed people is widespread in towns. Due to the characteristics of instability, flexibility and richness,informal commerce has gradually developed into an important business to attract residents and tourists. In this paper, the general characteristics of informal commercial behavior in towns, the characteristics of the urban public space bearing this kind of commerce, and residents' demand for informal commercial space were summarized, and then the optimization strategies of this kind of public space were put forward to help towns make full use of their scattered space, create diversified commercial places, and add vitality to urban space while providing residents and tourists with daily life needs and convenience.

Efficient practical codebook-precoding MIMO scheme based on signal space diversity

A novel practical codebook-precoding multiple-input multiple-output（MIMO） system based on signal space diversity（SSD） with the minimum mean squared error（MMSE）receiver is proposed.This scheme utilizes rotation modulation and space-time-frequency component interleaving.A novel precoding matrix selection criterion to maximize the average signal to interference plus noise ratio（SINR） is also put forward for the proposed scheme,which has a larger average mutual information（AMI）.Based on the AMI- maximization criterion,the optimal rotation angles for the proposed system are also investigated.The new scheme can make full use of space-time-frequency diversity and signal space diversity,and exhibit high spectral efficiency and high reliability in fading channels.Simulation results show that the proposed scheme greatly outperforms the conventional bit- interleaved coded modulation（BICM） MIMO-orthogonal frequency division multiplexing（OFDM） scheme without SSD,which is up to4.5 dB signal-to-noise ratio（SNR） gain.

Design and Experimental Demonstration of Software Defined Space Optical Network (SDSON) Architecture Based on Cloud Platform

Space information network is used for real time acquiring, transmitting and processing the space information on the space platform, which provides significant communication services for communication, navigation positioning and science exploration. In this paper, the architecture of Software Defined Space Optical Network (SDSON) based on cloud platform is designed by means of Software Defined Optical Network (SDON) and cloud services. The new architecture combining centralized and distributed management-control mechanism is a multi-layer and multi-domain architecture with powerful computing and storage ability. Moreover, reliable service and unreliable service communication models employed in the space information network are proposed considering the characteristic of Disruption/Delay Tolerant Network (DTN). Finally, the functional verification and demonstration are performed on our optical experimental network platform.

农业信息化标准分类方法研究

针对农业信息化建设中出现的标准缺失、标准混乱、标准配套性差的问题,提出了基于三维空间模型的农业信息化标准体系,并使用国际标准分类法对标准体系中的标准进行了详细的分类与说明,进而引入农业信息化行业标准分类标签,较好地平衡了标准分类框架的稳定性和适应性,基本满足了我国农业信息化过程中对标准的规范分类与动态组织的要求。

网络学习空间变革学校教育的路径与政策保障——网络学习空间内涵与学校教育发展研究之七

文章在"网络学习空间内涵与学校教育发展"前续研究的基础上,通过归纳网络学习空间促进班级教学变革的阶段特征,梳理了网络学习空间变革学校教育的路径,并针对不同层次的网络学习空间对学校教育提出的挑战,给出了有效促进网络学习空间应用的政策建议。界定网络学习空间的定义,从动态性、进化性、聚合性、联通性和适应性等五个特征来对定义进行阐释。

信息时代的城市空间组织演变

随着信息社会的来临,城市社会经济领域和文化价值观念等出现深刻的变化,产生了所谓的新城市现象。文章分析了信息化浪潮对城市发展的影响及城市的应对策略,认为在信息技术作用下城市空间发展是趋于分散的,但在以人口为表征的物质空间走向分散的同时,城市功能空间(如控制、管理、政治、文化等)更可能趋于集中,城市空间布局也由机械的功能分区转向复合式的多中心网络状结构,这些变化对城市规划、建设和管理提出了新的要求。

实验教学中心培养大学生创新创业能力的实践与探索

华东理工大学信息技术实验教学中心秉承EHS理念以及LCS创新创业教育模式,结合自身学科特色,以电子产品设计技能训练创新教育基地为基础,积极开展以训练项目为载体的创新活动,组建了创新创业指导教师团队,大力扶持“华理创客空间”,加强各类实验室建设,为创新创业搭建优质服务平台,实施信息化建设,实现了全方位信息化开放式管理,有效提高了学生的创新创业能力。

网络学习空间平台的规划与设计——以未来教育空间站为例

网络学习空间平台是一个以教师、学生和家长为服务对象的网络化社交学习平台,能够建立优质教育资源的共建共享机制,让教师在网络上开展教学和教研活动,让学生进行个性化学习,推进教学方式与学习方式变革,实现教育的公平均衡发展。网络学习空间平台是实现"网络学习空间人人通"的重要支撑,因此规划和设计好网络学习空间平台,对我国教育信息化建设有非常重要的意义。本文参考国际空间站的设计理念,以未来教育空间站为例,详细论述了网络学习空间平台的发展构想,通过对网络学习空间平台发展目标、功能价值定位和技术定位等方面进行建设规划,进一步分析设计出网络学习空间平台横向和纵向两个方向的逻辑架构层次关系,并总结得到网络学习空间平台的建设策略。

基于共享网络空间的物理演示实验教学平台

基于教育信息化背景,利用网络服务运营商提供免费和共享信息技术服务的客观条件,提出了一种全新的物理演示实验利用方案。这一方案通过创建基于共享网络空间的物理演示实验教学平台,一方面有助于解决传统物理演示实验使用过程中所遇到的时域和地域受限问题;另一方面有助于推进传统演示实验与信息技术相融合问题,适应数字化时代,学生微课化、碎片化学习行为的需要。通过创建基于"360 Cloud+Faisco"的演示实验网络教学平台的等具体措施,对这一方案进行教学实践,为翻转课堂模式下物理演示实验的利用,提供借鉴参考。

变与不变:信息化背景下学校教育空间建设的新走向与定位

学校教育之于人的发展往往依赖于其特殊的学校教育空间。特定的教育目的、教育内容、教育方法与教育评价方式形塑特殊的学校教育空间。身处高速发展的信息社会,学校教育空间也发生着相应的变化:教育目的空间被学生个体的当下"发展"主导;教育内容空间被海量"知识"填充;教育方法空间被先进技术霸占;教育评价空间被"精准化""人性化"的评价充斥。然而,并不是所有的变化都有利于教育的发展,也并不是要改变一切。教育的发展需要使教育目的空间建设始终定位于人与社会的协调发展;教育内容空间建设既要重视应用性知识,也要注重理论性知识;教育方法空间建设应有利于师生互动与发展,而非盲目依赖技术手段;教育评价空间建设应立足于学生的发展,注意使用多种评价方式,重"留白"、去虚伪。

高职院校应用导向的“互联网+”教育信息化研究

结合教育信息化在浙江交通职业技术学院探索与实践,强化应用导向的信息化项目建设,以云计算、大数据为技术基础,与校园私有云建设、公有云互通互补,建设与应用"行之虹"学习空间,实现信息技术与教育教学的深度融合。按照"互联网+"的用户至上、专注、极致的思维,提出连接、融合、创新、增效是高职院校"互联网+"教育信息化建设的四个关键点。

城市基坑工程发展的几点看法

基坑工程的设计应该从强度控制设计向变形控制设计转变，才能满足日益严格的环境要求。同时，基坑工程的设计与施工紧密结合是基坑工程的必然趋势。本文强调基坑工程的设计参数应该通过现场反分析求得。