地理信息产业市场规范化政策初探

首先讨论了地理信息产业市场构成、业务活动和市场链的特点,在借鉴国外地理信息产业和国内有关产业市场管理经验的基础上,分析了目前我国地理信息产业市场准入、市场监管及行业自律等方面的现状,对进一步加强我国地理信息产业市场规范化管理提出了几点政策建议。     

带地质逆断层约束数据域的Delaunay三角剖分算法研究

在石油地质勘探三维建模中,逆断层是一种普遍的地质现象,它却控制区域地质的结构和演化与油气资源相关联,而逆断层数据点三角化问题在建模中也最为复杂。本文提出了一种可解决带地质逆断层约束数据域的三角剖分通用算法,通过对逆断层制图边界拓扑结构建立与分析,引入桥接点和辅助约束边界概念,对逆断层中复杂重叠域约束数据划分子区,最后进行Delaunay三角剖分,实现了带地质逆断层约束数据域的Delaunay三角剖分并应用于油气勘探设计等领域。     

S-ALOHA协议在无线接入系统中的实现

讨论了时分多址技术在点对多点无线通信系统中的应用，分析了S—ALOHA协议的性能，给出S—ALOHA在系统中的实现。     

Improving the recreational value of Ireland's coastal resources: A contingent behavioural application

This paper measures willingness to pay (WTP) for public access to additional beach area and trail improvements to a coastal recreational site in the west of Ireland. The Contingent Behaviour model is used to measure the increased number of trips associated with improved public access using a connecting trail between two beach areas along a stretch of Irish coastline. Results show that improving access through the use of the connecting trail increases consumer surplus by €111.15 per person per annum. It is argued that in designing new regulation such as Marine Protected Areas (MPAs) for the management of Ireland's coastline, an understanding of the values the Irish public place on coastal recreational access will be important to manage the resource in a sustainable manner.     

VO-DAS Registry系统的设计与实现

为了给天文学家提供一个统一访问分布存储于世界各地数据中心的异构天文数据资源的方案,中国虚拟天文台项目组设计了虚拟天文台数据访问服务(VO-DAS)。VO-DAS支持国际虚拟天文台联盟(IVOA)制订的各项相关标准,使得它具有良好的互操作性。VO-DAS Registry系统是VO-DAS系统的重要组成部分,它为VO-DAS系统获取数据资源的元数据,从而使得VO-DAS更好的管理和应用这些数据资源。在这个过程中,此系统符合IVOA的相关标准。     

角色访问控制的综合地质数据安全模型

为了有效地管理复杂多样的地质矿产数据,提高地质矿产数据的安全性,本文对地质矿产数据进行整理和分析,提出了综合地质数据模型.在此基础上,基于角色访问控制思想设计了综合地质数据的安全模型,并在ORACIE数据库和所开发的综合地质数据库管理系统中实现了该安全模型.     

Suffering for water, suffering from water: Emotional geographies of resource access, control and conflict

This article argues that resource access, use, control, ownership and conflict are not only mediated through social relations of power, but also through emotional geographies where gendered subjectivities and embodied emotions constitute how nature-society relations are lived and experienced on a daily basis. By engaging the insights from feminist political ecology literatures and emotional geographies literatures, the article demonstrates that resource struggles and conflicts are not just material challenges but emotional ones, which are mediated through bodies, spaces and emotions. Such a focus fleshes out the complexities, entanglements and messy relations that constitute political ecologies of resources management, where practices and processes are negotiated through constructions of gender, embodiments, and emotions. Abstractions of ‘resource struggles’ and ‘resource conflicts’ are thereby grounded in embodied emotional geographies of places, peoples, and resources, enabling us to better understand the ways resources and emotions come to matter in everyday survival struggles. This framing can enrich feminist political ecology theorizations and texture our understandings of commonly-used terms such as access, use, control, conflict and struggles vis-à-vis natural resources in any context. In other words, we are better able to conceptualize and explain how and why people access, use, and struggle over resources the ways they do. A case study of drinking water contamination from Bangladesh is used to develop the theoretical arguments in contributing to existing debates in (feminist) political ecologies.     

第一次世界大战初期德国东亚驻军跨岛链作战的军事地理分析

就军事地理环境而言,当代中国在海洋方向面临的最主要威胁来自环中国岛链的封锁,研究这一限制性地理环境对准备和实施军事活动的影响与相应对策,具有重要的现实意义。第一次世界大战（简称“一战”）初期,德国东亚驻军进行了跨岛链作战的实践,但在日本海军依托岛链和优势兵力的封锁下,其战略目标未能达成,并且出现了军事地理位置上的优劣转换。本文通过对“一战”初期德国东亚驻军跨岛链作战行动的军事地理分析,尝试提出军事地理研究思路、跨学科融合路径和分析框架。本文分析认为,彼时德占青岛虽然具有良好的战略态势和强大的军事力量,但孤悬海外,且缺乏战略纵深;从宏观的区域尺度分析来看,基地与舰队间的联系被岛链分隔,腹背受敌,军事地理上的劣势凸显。但依托岛链进行封锁,需要集结大量兵力,利用对方边缘区内作战力量相对比较薄弱的有利条件,原本实力较弱的德国东亚舰队取得了重大战果,形成反转式的“核心—边缘”结构。本文为中国的海疆安全和海洋强国建设提出了5条建议。     

Distributed cache replacement method for geospatial data using spatiotemporal locality-based sequence

Specific features of tile access patterns can be applied in a cache replacement strategy to a limited distributed high-speed cache for the cloud-based networked geographic information services (NGISs), aiming to adapt to changes in the access distribution of hotspots. By taking advantage of the spatiotemporal locality, the sequential features in tile access patterns, and the cache reading performance in the burst mode, this article proposes a tile sequence replacement method, which involves structuring a Least Recently Used (LRU) stack into three portions for the different functions in cache replacement and deriving an expression for the temporal locality and popularity of the relevant tile to facilitate the replacement process. Based on the spatial characteristics of both the tiles and the cache burst mode with regard to reading data, the proposed method generates multiple tile sequences to reflect spatiotemporal locality in tile access patterns. Then, we measure the caching value by a technique based on a weighted-based method. This technique draws on the recent access popularity and low caching costs of tile sequences, with the aim of balancing the temporal and spatial localities in tile access. It ranks tile sequences in a replacement queue to adapt to the changes in accessed hotspots while reducing the replacement frequency. Experimental results show that the proposed method effectively improves the hit rate and utilization rate for a limited distributed cache while achieving satisfactory response performance and high throughput for users in an NGIS. Therefore, it can be adapted to handle numerous data access requests in NGISs in a cloud-based environment.     

Unravelling property relations around forest carbon

Market‐based interventions to Reduce Emissions from Deforestation and Forest Degradation (REDD+) enable the carbon stored in land and forests to be traded as a new and intangible form of property. Using examples from Cambodia, the Philippines and Papua New Guinea, we examine the property negotiations underpinning this new forest carbon economy. We show that the institutions and land use negotiations needed to ‘produce’ forest carbon interact recursively with existing property claims over land and forests. Even where customary rights are formally recognized (PNG, Philippines), claims to forest carbon are still complicated by ambiguities and complexities surrounding rights to forested land. Meanwhile the new value attached to forest carbon can stimulate efforts to appropriate land and forest resources associated with it, creating new power relations and property dynamics. This interplay between forest carbon and underlying contested property claims in rural forest settings creates an unstable basis for forest carbon markets and raises questions about future access to forested land.