基于森林景观恢复策略的庄园遗产景观设计探寻——以荷兰海德兰省巴克塞比克地区为例

庄园遗产景观是指包含花园和农业用地的历史乡村庄园集群。在气候变化、工业发展和快速城市化的背景下,庄园遗产景观正面临水生态环境失衡、空间碎片化和文化特征消失等挑战,而这些挑战只能从区域规划尺度去应对。以荷兰海德兰省巴克塞比克地区为例,在考虑地方景观异同的同时,以景观自身特性为基底,结合未来发展趋势,进一步诠释了一种旨在提升庄园遗产景观韧性的多尺度景观设计方法。发现森林砍伐为地域空间变化的主要因素之一,它对水系统与生态多样性造成了负面影响。基于在区域尺度上对庄园遗产景观历史发展的分析,森林景观恢复(FLR)作为主要设计策略,旨在从不同尺度上对“退化的”景观进行生态功能修复并提升人类福祉。这种新的空间设计方法将在不同尺度上促进文化遗产景观发展。     

城市白色用地与灰色用地规划比较研究

面对稀缺的土地资源,快速的工业化进程以及强劲的面向服务业的经济转型,弹性控制用地在土地利用规划中越来越重要.而白色用地和灰色用地同属于弹性控制用地,通过比较白色用地和灰色用地规划,得出更加适合我国土地利用规划的理论和方法,从而提高国内城市规划的可实施性,改进其对城市建设发展的引导和控制效果.     

无线视频传输中FEC与WZ联合抗误码算法研究

无线视频编码的低抗误性、无线信道带宽的有限性、无线视频业务的高需求决定了高鲁棒性的抗误算法必将成为无线视频通信的核心问题之一.基于FEC与WZ (Wyner-Ziv)两抗误工具的在不同误码率下抗误互补特性,提出了FEC与WZ联合抗误码方案.实验表明:该方案有效地综合了两者优点,提升了平均PSNR.     

一种基于高速弹性分组环的线性逼近公平算法

弹性分组环(RPR)中最关键的技术之一是环路分布式公平算法.IEEE802.17工作组制定的RPR草案中关于公平算法存在一些待完善的问题,比如在高速的网络中存在较长的收敛时间,同时对于非平衡流带来的永久性震荡现象也无法消除.本文针对上述这些问题提出了一种新的公平算法.仿真结果表明算法不仅能够消除非平衡流问题,而且能够公平地控制站点之间带宽的分配.     

Error resilient video over multimedia broadcast multicast services (MBMS)

With available data rates for mobile devices constantly increasing, services such as video broadcast and multicast are becoming feasible. A new standard called Multimedia Broadcast Multicast Services (MBMS) is being developed by 3GPP to enable new class of spectrum-efficient multimedia services. Multicast services are expected to serve a diverse user base with varying connectivity and capabilities. We analyze the problem of video error resilience in MBMS services that is critical to maintain consistent quality for end users. The existing error resilience techniques for IP multicasting are not applicable in the MBMS environment. In this paper, we present error resilience techniques that are applicable within the context of the MBMS standard. We propose an Intra Block Refresh method for MBMS services and the results show improved performance. We develop a methodology that can be applied to adapting traditional error resilience tools for the MBMS environment.     

车辆载荷作用下路基土的变形特性

通过路基土在重复荷载作用下的室内实验，研究了路基土回弹变形和累积变形随荷载轴次增长的发展规律以及各种因素对累积变形的影响。所有试验均在MTS试验系统上完成。相关研究及分析成果是发展路面力学设计方法所必备的依据之一。     

The Concept of Planned Development: A Presentation and Commentaries on the Contribution of Nathaniel Lichfield

This article and the commentaries which accompany it centres on a reflection by consultant-academic Nathaniel Lichfield on his work on planned development and the evaluation of the impacts of such development, over a career spanning the past 60 years. His work, in the UK and across the world, had a formative influence on generations of planners brought up on his texts. In this presentation, David Adams sets the context of his contribution. The heart of the article is a reflective synthesis by Lichfield on his own work from his first major contribution in 1956, to its evolution in the 1960s into the technique of the Planning Balance Sheet, and later, Community Impact Evaluation. His starting point is that there can be urban and regional planning which does not lead to physical development on the ground and there can be such development on the ground that has not been influenced by government led urban and regional planning. Neither of these is planned development. This takes place when the two are fused together in practice: the development and the government led planning. It is this simple concept, with particular emphasis on its economics, which was treated at length in the Economics of Planned Development (1956). In order to fully describe the concept, the book's contents are summarized in the first half of this article following an introduction of the background. Following the publication of the book, Lichfield's professional and academic work took him in many directions, much of which fell loosely under the ambit of the economics of planned development. His contributions were not written up as sequels to the book but rather in related books, papers and articles under an array of topics. He terms these 'the children of EPD'. They are described in the second half of the article, grouped in relation, as appropriate, to each of the main themes of the 1956 book and extensions of it. Lichfield's article is followed by three commentaries. The first, by Mike Teitz, positions his work and its later development in the changing context of the times. The second, by Barrie Needham, provides some critical thoughts on how well the concept of 'planned development' travels transnationally into different institutional contexts. The third, from consultant-planner Alan Wenban-Smith, himself working on policy evaluation in the UK, explores the practical and methodological robustness of Lichfield's concepts. Overall, the piece provides an input to reflections on the relation between state and market in the development process and on the evaluative stance the state should take to its interventions.     

Resilient readers? University students who are poor recoders but sometimes good text comprehenders.

The authors screened 194 university students to determine whether some could comprehend text well despite very poor recoding skills, measured by pseudoword reading. Most of the 17 poorest recoders had never been identified as reading disabled. We classified 6 poor recoders as "resilient readers" because their text comprehension scores were average or above, relative to the sample as a whole. They were indistinguishable from 6 matched typical readers on measures of text comprehension derived from oral-reading think-aloud protocols. There was no evidence that the resilient readers relied on superior verbal ability or working memory to compensate for poor recoding. The resilient readers were poor at spelling, reading isolated words, and reading text rapidly, but they showed adequate phonemic awareness. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

MSTP的应用与发展

多业务传送平台(MSTP)和数据设备的关系是联合组网、长期并存的关系,运营商的运维体制必须改革,不能仍将传输设备和数据设备截然分开进行建设;互连互通涉及到业务层、封装层、数据处理层、SDH承载层、SDH线路侧,运营商应重点关注;MSTP的进一步发展是加载自动交换光网络(ASON)控制平面,但要注意在支持数据业务的情况下,传送平面和控制平面在带宽调整方面的协调性;MSTP将来可能有两种转向:逐步退出传送网络的核心层或演化成为事实上的以分组交换为核心的承载网设备.     

采用弹性分组环技术的NGN承载网解决方案

首先分析了NGN的网络特性和需求,然后在阐述弹性分组环技术（RPR）特性的基础上论证了采用RPR技术承载NGN业务的可能性,最后提出了基于RPR技术的NGN承载网总体解决方案.