"小高层"住区整体风貌与环境特色

“小高层”住宅(7～11层)因其特有的优势逐渐成为当今住宅发展中一种不可忽略的形式。文章从“小高层”住区的景观轮廓与空间限定、住宅形象与造型艺术及住区人与自然的关系等方面探讨了“小高层”住区整体风貌与环境特色。     

威海城市高层建筑控制研究

针对高层建筑开发给威海传统景观风貌带来的影响,借助于视觉安全格局途径,建立维护视觉感知过程的关键格局,甄别城市景观风貌保护的"底线"。从城市的天际线保护和视觉通廊保护两个方面,建立建筑高度的刚性控制框架以指导城市高层建筑的发展。     

基于 Silverlight 的二三维联动 WebGIS 的设计与实现

目前二维、三维GIS各有优劣,WebGIS也愈发追求系统效率和界面表现力,本文结合二维、三维GIS的优势,提出一种基于Silverlight的城市级别的二三维联动WebGIS方案,明显提高了WebGIS的系统效率和界面表现力,并利用ArcGIS API for Silverlight以及Skyline TerraExplorer Pro,开发了天津市静海县二三维联动地下管线信息管理系统。     

滨湖住区形态研究与实践

深入分析了目前城市滨湖地区发展中存在的主要问题,结合岳阳中航·翡翠湾规划设计实例,提出了一种基于国情较为合理的滨湖住区形态,改善了人居环境,使滨湖景观更加完美。     

城市核心区设计:新加坡的亚洲经验

通过对中心区城市设计政策和建议的分析,讨论了在一个特定的历史脉络下,一个东亚现代城市其城市核心区如何转型、如何预见其未来、如何面对全球竞争以及如何走向可持续发展目标的城市发展模式。     

Efficient and scalable continuous skyline monitoring in two-tier streaming settings

Two-tier streaming settings are a typical dynamic environment where continuous skylines represent an important semantic indicator for multiple attributes. To monitor skylines over the dynamic data in such settings, one needs to continuously update the skyline query results in order to reflect the new data values. This paper tackles the problem of continuous skyline monitoring on a central query server over dynamic data from multiple data sites. Simply sending the updates of tuple values to the server is cost-prohibitive. Therefore, we propose an approach that allows the central server to collaborate with the data sites to monitor the possible skyline changes. By doing so, the processing load is distributed over all the data sites instead of only on the central server. Furthermore, this collaborative approach minimizes the bandwidth consumption between the server and the data sites, which is often critical in a widely distributed environment such as a wide-area sensor network. We give theoretical upper bounds for the computation costs and communication costs of the proposed collaborative approach. We also conduct extensive experiments on both synthetic and real data sets. The experimental results demonstrate that our collaborative approach is efficient, scalable and well-balanced in terms of communication costs and computation costs.     

Efficient processing of probabilistic group subspace skyline queries in uncertain databases

Due to the pervasive data uncertainty in many real applications, efficient and effective query answering on uncertain data has recently gained much attention from the database community. In this paper, we propose a novel and important query in the context of uncertain databases, namely probabilistic group subspace skyline (PGSS) query, which is useful in applications like sensor data analysis. Specifically, a PGSS query retrieves those uncertain objects that are, with high confidence, not dynamically dominated by other objects, with respect to a group of query points in ad-hoc subspaces. In order to enable fast PGSS query answering, we propose effective pruning methods to reduce the PGSS search space, which are seamlessly integrated into an efficient PGSS query procedure. Furthermore, to achieve low query cost, we provide a cost model, in light of which uncertain data are pre-processed and indexed. Extensive experiments have been conducted to demonstrate the efficiency and effectiveness of our proposed approaches.     

基于MapReduce的增广动态Skyline查询处理方法

Skyline查询能够计算大规模的数据集中满足多个标准的最优解,被广泛应用于多目标决策等领域.动态skyline查询作为skyline查询的一种重要变体,其结果随着查询点的不同而动态改变,为用户在指定查询要求方面提供了更大的灵活性.然而,随着数据量的不断增加,动态skyline查询会产生大量的查询结果,忽略了查询点的维度方向性和数据的全局整体性,给用户的选择带来极大困难.因此,需要进一步优化动态skyline查询的结果集,提高全局整体性,过滤冗余数据.针对上述问题,提出一种基于MapReduce的增广动态skyline查询处理方法.该方法将原始数据按照维度信息进行分区,在多个节点并行计算动态skyline,优化传统动态skyline结果集,同时提供全局更优的结果供用户选择.在此基础上,针对用户给出某些维度的容忍度的情况,提出一种引入用户容忍度的增广动态skyline查询处理方法.该方法可以根据用户容忍度缩减增广动态skyline查询的原始数据集,很大程度上减少中间结果的比较次数,并且提高了结果集的准确度.大量实验证明,基于MapReduce的增广动态skyline查询处理方法具有更好的有效性、准确性和可用性.     

诗情画意——南京重要城市轮廓线研究解析

城市轮廓线是以建筑、树木,山峦等各种城市实体元素以天空为背景呈现出的叠加效果,具有空间识别、形象展现、文化记忆等多种功能。文章通过对南京诸多重要城市轮廓线的解读,归纳其＂山、水、城、林＂四种不同的类别,并分别针对类别特点,选取典型轮廓案例进行分析,提出未来控制与优化的措施。