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基于共词分析的复杂网络研究现状分析 总被引:1,自引:0,他引:1
以CNKI总库上有关复杂网络的相关文献为数据源,在共词分析的基础上通过多维尺度分析方法和战略坐标分析方法探析复杂网络在我国的研究现状及发展趋势,为从事复杂网络研究的学者提出参考.结果表明:①复杂网络的研究可分为两类,一类是复杂网络的理论研究,另一类是复杂网络的管理和安全方面的研究,这两个研究领域联系不紧密.②复杂网络的理论研究涉及复杂网络拓扑统计性质、演化机制与稳定性等,该领域整体联系比较紧密,研究趋向成熟.复杂网络管理、安全类团内部结构松散,研究尚不成熟,但与复杂网络中其他研究结合紧密,有进一步的发展空间.③在复杂网络的理论研究方面,与复杂系统、加权网络、拓扑结构、同步、稳定性、神经网络相关的研究领域可能成为今后研究的热点领域;在复杂网络管理、安全方面,SNMP将有可能成为热点研究项目. 相似文献
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Knowledge of the forces driving and modifying ecosystems can be employed in concert with signal analysis to target the data
most likely to yield sensitivity and resilience information. One can optimize return of information per investment of resources
by targeting segments of signals that are dominated by the force of interest, coupled with scientific understanding of the
system of interest. This force analysis approach is an effective means both to design efficient new monitoring programs and
to target relevant information in large data files. We present five example applications of force analysis. Three examples
illustrate this approach for an evaluation of whether Canadian rivers might be sensitive to changes in climate. It was concluded
that Canadian rivers appear to be sensitive to changing climate. A fourth example illustrates how automated snow pillow data
may be evaluated to ascertain the sensitivity of snow accumulation to change in climate. It was concluded that snow accumulation
at the site evaluated did appear to be sensitive to changing climate. The fifth example illustrates the assessment of whether
a river recovers with the elimination of inputs of iron from an abandoned mine. It was concluded that resilience remained
unproven since the river had not as yet restabilized. The force analysis approach focuses data collection or data evaluation
on those data required to answer specific resource management questions, greatly reducing collection or consideration of data
that are not relevant to that question. This approach is potentially very cost-efficient and therefore is likely to be of
interest to hydrologists, climatologists, and environmental data managers. 相似文献
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Briassoulis H 《Environmental management》2001,27(1):1-11
Integrated analysis of land-use change in support of informed policy-making for sustainable land use at various spatial levels
makes heavy requirements for quality data. This paper aims to structure the principal methodological and practical issues
of data needs for this task. The data needs for local level analyses of land-use change are given special attention. The paper
adopts an integrated economic–environmental modeling framework and suggests the main types of data needed. Four main data
dimensions are distinguished: system of spatial reference, system of temporal reference, definitions, and data collection
procedures (sources, collection instruments and techniques, recording and retrieval systems, data format, frequency of data
collection). To evaluate the suitability of current data sets as well as to guide the collection of new ones, a scheme based
on substantive and practical criteria is employed. The former include compatibility, consistency, and reliability of data,
while the latter include availability, ease and cost of data collection/retrieval, and transferability of data. The evaluation
indicates the broad gaps in current data sets along the four main data dimensions. Based on this evaluation, the paper suggests
framework guidelines to address the main data issues identified. RID=" ID=" <SUP>1</SUP>CLAUDE: Coordinating Land Use and
Land Cover Data and Analyses in Europe. European Commission Concerted Action project (DG-XII); DAPLARCH: Data Plan Development
for Land Use and Land Cover Change Research. Program sponsored by IGBP-IHDP (LUCC and DIS). Street, Durham, North Carolina
27707, USA 相似文献
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生态行政浅析 总被引:2,自引:0,他引:2
萨础日娜 《中国环境管理干部学院学报》2008,18(3)
生态行政学是20世纪90年代兴起的一门行政学分支学科,学术界常常将其与行政生态学相混同。本文试图通过对生态行政的发展历史、理论渊源、定义、基本内涵进行阐述,使其区别于行政生态学,希望能够对生态行政学科的建立有所益处。 相似文献
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DDSC(双数据处理振动控制器)系统是美国Dactron公司90年代研制的用于振动试验控制的新型振动控制器,具有硬件可靠,指标先进,功能完善的特点,在振动控制中具有很高的实用性和性价比,本文从使用的角度对其功能和技术特点进行展开分析。 相似文献
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当前,我国矿山环境问题突出。重点分析了矿山开采环境问题的特殊性,这些特殊性包括矿业对地域区位的依赖性、破坏的大量不确定性以及不可逆性。根据特殊性,讨论了环境经济学的适用性。不确定问题转化为确定性问题或者风险问题依赖于技术层面学科(如矿山环境影响评价和矿山环境地质学等)的支撑。最后指出随着这些技术学科的发展,矿山环境问题就会更精确地纳入成本——效益分析框架,从而发挥更大的作用。 相似文献
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Gregory A. Norris 《环境质量管理》2001,10(3):59-64
Current life‐cycle assessment (LCA) methodologies rarely include economic analysis—even though this element is almost always crucial to any company's decision making. This article discusses practical tools for integrating economic considerations into LCA. © 2001 John Wiley & Sons, Inc. 相似文献
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基于ArcGIS的坡度分析 总被引:2,自引:0,他引:2
坡度对土壤侵蚀的影响最大,是水土保持工作中首先要考虑的因素之一。用传统方法计算研究区坡度组成和平均坡度的效率低、精度低;而应用ArcGIS软件的空间分析功能对研究区进行坡度分析的效率高、精度高,减少了人为主观因素的影响,为水土保持工作提供一种新技术、新方法。 相似文献
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详细、全面地阐述了废水监测工作系统应具备的基本条件和设施及各个环节之间的协调配合关系,指出了该系统管理中应注意的主要问题。 相似文献
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设备在遭遇不同程度的静电放电时,其自身的安全性和可靠性面临着巨大的考验。GB/T 17626.2-2006、GJB 1389A-2005和RTCA/DO-160F均描述了静电放电试验项目。比较分析这三个标准对该项目在试验目的、适用对象等方面的差异,可以发现这三个标准的考核要求和试验方法也不尽相同。GB/T 17626.2-2006是一项基础性标准,适用于各种电子设备;GJB 1389A-2005主要针对垂直起吊、空中加油系统以及军械分系统,考核其在装卸、运输和垂直补给过程中的安全性和可靠性;RTCA/DO-160F主要考核的是民航空运设备在经受静电脉冲后执行预期功能的能力。 相似文献
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以1979—2020年我国中央政府颁发的411份城市生活垃圾治理政策文本作为研究对象,运用共词与聚类分析方法研究了我国不同时期城市生活垃圾治理公共政策焦点的演变规律。结果发现:纵观我国城市生活垃圾治理公共政策焦点的演变轨迹,在"技术路线"、"垃圾属性"、"管理手段"、"治理结构"和"保障机制"方面发生了显著的政策主题变迁,呈现出垃圾治理朝更加绿色、更加经济方向发展的趋势。未来,应从监管体系、资源评估、财政补贴、空间布局4个方面保障生活垃圾零污染、高价值资源化治理。 相似文献