LBS在监外服刑中的应用

移动位置服务在未来几年内将成为移动运营商的主要增值手段,中国联通今年将在CDMA1x网络中启动gpsOne定位业务。通过分析比较各种定位技术,根据监外服刑监管系统的要求,提出采用中国联通的CDMA1x网络和gpsOne定位平台来进行数据传输和位置跟踪的监管系统整体解决方案,并在系统架构、电子镣铐的软硬件设计等方面进行了初步的探讨。     

Probabilistic and statistical relationships between number of vehicles and number of visitors at a geologic site in a National Park

The National Park Service needs to establish in all of the national parks how large the parking lots should be in order to enjoy and preserve our natural resources, for example, in the Delicate Arch in the Arches National Park. Probabilistic and statistical relationships were developed between the number of vehicles (N) at one time in the Wolfe Ranch parking lot and the number of visitors (X) at Delicate Arch 1.5 miles away in the Arches National Park, southeastern Utah. The value ofN is determined such that 30 or more visitors are at the arch only 10% of the time.     

关于建立基础测绘公益性服务机制的探讨

为更好地发挥基础测绘的公益性服务功能 ,特别是为领导决策机关和宏观管理、行政管理服务 ,需要建立基础测绘公益性服务机制 ,并完善基础地理信息数据的提供和使用政策     

美国田纳西河流域地区综合开发与城镇化

田纳西河流域地区原为美国典型的贫困地区,经过60年开发建设,1990年时已接近美国平均发展水平。通过实地调查考察,本文分析了该区综合开发与城镇化过程,及其区域城镇体系特征,指出其城镇化经验对于我国黄河上中游等内陆欠发达地区具有重要的借鉴意义。     

贵州省旅游业区位重构研究

基于王瑛、王铮(2000)提出的旅游业区位模型,在考察了贵州省旅游景观分布后,本文修正了他们的模型,并划分了旅游业区位带:风景名胜带;奇异风光带;特色资源带;差异突出的文化与自然风光带。旅游业的这种空间机构类似杜能模型,但决不是杜能现象而是新地理现象。本文强调,贵州省以舞阳河为代表的喀斯特地貌景观属于青年期,在形态结构上不同于云南以石林为代表的壮年期地貌和广西的以桂林为代表的老年期地貌,是一种新的旅游地貌资源,需要突出资源特点开展营销。根据新的区位模型,本文讨论了贵州省旅游业区位,并且提出3条建议:通过建设高速公路将原来行程9小时的路程缩为6小时的;以舞阳河风景区为中心组织特色资源区;建设航空港发展一些资源条件好的地区为旅游亚中心。     

适用于旅游地理学的一种概念模型

米切尔以反映旅游业特征的需求、供给、联系为列，目的、结构、区位三大层面为行，建立起概念矩阵模型。本文阐释这一模型，并将其具体化为旅游地理学研究体系。最后给出应用实例，指出这个模型对一些命题单一、针对性强、又很具体的旅游业可以提供一种有益的系统思维方式。     

A proposed framework for feature‐level geospatial data sharing: a case study for transportation network data

Current data sharing in the Internet environment is supported using metadata at the file level. This approach has three fundamental shortcomings. First, sharing data from different sources with different semantics, data models, and acquisition methods usually requires data conversion and/or integration like data conflation. This can be tedious and error‐prone. Second, data updated from one source cannot be automatically propagated to other related data or applications. Finally, data sharing at the file level makes it difficult to provide feature‐level data for searching, accessing, and exchanging in real time over the Internet. This paper addresses these three issues by proposing a standards‐based framework for sharing geospatial data in the transportation application domain. The proposed framework uses a standard data model—geospatial data model proposed by the Geospatial One‐Stop initiative to harmonize the semantics and data models without the use of data integration methods. It uses Geography Markup Language (GML) for geospatial data coding and feature relationship, which provides a basis to propagate the data update from one source to related other sources and applications, and to search and extract data at the feature level. The framework uses the Web Feature Service (WFS) to search, access and extract data at the feature level from distributed sources. Finally, the Scalable Vector Graphics (SVG) standard was used for data display on the Web browser. Two transportation network datasets are used in the prototype case study to implement the proposed framework. The prototype allows the user to access and extract data at the feature level on the Web from distributed sources without downloading the full data file. It shows that the proposed standards‐based feature‐level data‐sharing system is capable of sharing data without data conflation, accessing, and exchanging data in real time at the feature level. The prototype also shows that changes in one database can be automatically reflected or propagated in another related database without data downloading.     

Quality of service management framework for dynamic chaining of geographic information services

Dynamic chaining of geographic information services (geo-services) is gaining popularity as a new paradigm for evolving flexible geo-information systems and for providing on-demand access to geo-information. In dynamic chaining, disparate geo-services are discovered and composed at run time to yield more elaborate functionality and create value-added geo-information. Common approaches to service chaining discover and compose disparate geo-services based on the functional capability of individual geo-services. The primary concern of common approaches is thus the emergent behavior of the resulting composite geo-service. However, as geo-services become mundane and take on a greater and more strategic role in mission critical processes, deliverable quality of service (QoS) becomes an important concern. QoS concerns operational characteristics of a service that determine its utility in an application context. To address pertinent QoS requirements, a new approach to service chaining becomes necessary. In this paper we propose a QoS-aware chaining approach in which geo-services are discovered, composed and executed considering both functional and QoS requirements. We prescribe a QoS management framework that defines fundamental principles, concepts and mechanisms which can be applied to evolve an effective distributed computing platform for QoS-aware chaining of geo-services – the so-called geo-service infrastructure. The paper also defines an extensible QoS model for services delivered by dynamic compositions of geo-services. The process of orthophoto generation is used to demonstrate the applicability of the prescribed framework to service-oriented geographic information processing.     

提高图书馆服务质量的冷思考

分析了影响图书馆服务质量提高的实质性问题 ,认为图书馆的管理者忽视了“读者第一”的办馆宗旨 ,忽视读者抱怨以及忽视馆员素质的持续提高。并针对这些问题提出建议与对策     

试论工业区工业企业成组布局的经济效果和最佳规模的确定

分析了工业区工业企业成组布局与分散布局相比较的经济效果,并采用年费用指标作为评价成组布局经济效果的基本指标。本文还分析了工业成组布局的经济效果与工业区规模之间的关系。本文以年费用最小为目标函数,以成组布局工业区的一些主要企业(基本企业)和与其相应的具有替代关系的分散布局企业(对比企业)为变量,建立了工业成组布局经济效果及最佳规模优化模型。