IP电话系统网守的研究与实现

IP电话系统是具有广阔发展前景的新型电信业务。研究了在H .32 3协议下 ,IP电话系统中网守所起的作用 ,探讨了具有地址映射、域管理、呼叫代理、计费功能的网守的实现方案 ,并对该网守的特点进行了分析。     

Improving road transport operations through lean thinking: a case study

Traditionally, logistics and transportation problems have been addressed through mathematical modelling, operations research, and simulation, but criticism has emerged about their effectiveness to actually address real-life problems. This paper documents a case study whereby the road transport operations of a leading Mexican brewery were improved through lean thinking and waste reduction. Two lean-based principles and tools were combined: the Seven Transportation Extended Wastes and Transportation Value Stream Mapping. Three systematic steps were proposed to facilitate the implementation of improvement. Feasibility studies conducted in this research suggested that lean thinking is an effective alternative for the improvement of road transport operations. The findings of this research could be used as guidance for transport managers to improve road transport operations. This paper also expands the limited evidence of the application of lean thinking in road transport logistics and highlights the research areas where its application has been concentrated in this sector.     

成渝地区双城经济圈建设面临的主要问题及对策——基于CiteSpace文献计量分析

成渝地区作为西部经济增长的重要引擎,在中国区域协调发展战略中占据重要地位,对其不同阶段的经济发展理论及实践进行考察具有重要现实意义。文章依托CNKI数据库1994~2019年相关文献,运用CiteSpace5.3绘制成渝地区经济发展相关研究文献的知识图谱,可视化分析相关研究的热点、变化趋势及机构空间分布特征。在新时代成渝地区双城经济圈建设上升为国家战略的背景下,分析其建设面临的主要问题,指出应重点从加强开放合作,增强内生协同发展动力和资源环境承载力,并从成渝地区经济重心变化轨迹等方面寻求应对策略。     

Citation footprints on the sands of time: An analysis of idea migrations in strategic management

We elucidate the intellectual progression of the strategic management field by examining knowledge flows to and from the Strategic Management Journal (SMJ) during the period 1980–2009. We provide a detailed mapping of the evolution of the intellectual structure of the field and identify its input‐output dependency relationships with other fields. Analysis of citation data using three analytic techniques: log‐multiplicative model, pathfinder analysis, and entropy analysis allow us to discern strategic management's influence on and engagement with other disciplines. The results show that, within the intellectual universe of strategic management, SMJ has played a central role, both as a source and storer of knowledge. We notice that, over time, there has been a decline in practitioner orientation, greater communication with finance and sociology, and increasing linkages with international business and entrepreneurship. Copyright © 2015 John Wiley & Sons, Ltd.     

无人机航空摄影在农村土地承包确权工作中的应用

无人机航空摄影以无人驾驶飞机作为空中作业平台,集合高空拍摄、遥感以及航空摄影于一体,对农村范围内的集体土地,包括属于农民集体所有的建设用地、农用地和未利用地进行航空摄影,获取准确的地形图数据,以保证农村集体土地登记确权发证工作有效进行。本文对无人机航空摄影技术在农村土地承包经营权确权登记发证工作进行简单介绍。     

知识型组织的员工忠诚度测量和提高——对某测绘局的案例分析

知识型组织的核心资产就是其掌握科学知识技术的人才。如何提高知识型员工对组织的忠诚度,使其竭诚为组织作出贡献,是一个非常现实的课题。本文以某地处西部的一个测绘局作为分析的案例,使用个人因素和组织因素,构建了一个定量测量的模型,意在依据测量指标数据,度量其员工的忠诚程度,确定在培养忠诚度方面的某些薄弱环节,针对性地提出在人才培养、激励机制、政策制定、组织结构等方面的改进意见。     

Empowering residents and improving governance in low income communities through urban greening

This paper describes the objectives, process and outcomes of three urban greening projects and how they contributed to sustainable development. The first two were conducted in low-income communities in Bangkok, Thailand, and in Badulla, Matale and Moratuwa, Sri Lanka. The lessons from these two projects were then incorporated in a post-tsunami project in Moratuwa and Matara, Sri Lanka. In addition to achieving urban greening objectives, the projects developed and validated a conceptual framework of sustainable community development (the Four-Directional Framework) using participatory action research. This framework facilitated rapid community learning and development objectives such as urban greening and consequential poverty reduction, empowerment of women, and improvements to the environment. Urban greening, incorporating urban agriculture, was an effective tool to improve the relationship between local authorities and the residents of marginalized and low-income communities and build a foundation for continuing sustainable development initiatives and city-to-city learning.     

Systemic risk,economic policy uncertainty and firm bankruptcies: Evidence from multivariate causal inference

The paper investigates causal relationships between systemic risk, economic policy uncertainty and firm bankruptcies, conditional on global volatility proxied by the VIX index, in a sample of 15 advanced and major emerging market economies during January 2008-June 2018. We test for Granger causality in time and frequency domains as well as dissect multivariate causal linkages in the dynamic complex system framework by applying a novel technique – convergent cross mapping (Sugihara et al., 2012). Based on strictly coincident results from all the three approaches, we find that systemic risk causes firm exit in Spain, while in the UK and the Netherlands bankruptcies are triggered by economic policy uncertainty. In South Korea and the USA, the VIX index causes the firm shutdown. For the rest of the countries, the causality inference provides less robust evidence. We argue that the magnitude of deleveraging by banks with respect to the private nonfinancial sector, proxied by the volatility of credit-to-GDP gaps, shapes the presence or absence of causal impact by systemic risk, economic policy uncertainty or the VIX index on bankruptcies.     

Identification and Estimation of Club Convergence Models with Spatial Dependence

This article deals with heterogeneity and spatial dependence in economic growth analysis by developing a two‐stage strategy that identifies clubs by a mapping analysis and estimates a club convergence model with spatial dependence. Since estimation of this class of convergence models in the presence of regional heterogeneity poses both identification and collinearity problems, we develop an entropy‐based estimation procedure that simultaneously takes account of ill‐posed and ill‐conditioned inference problems. The two‐step strategy is applied to assess the existence of club convergence and to estimate a two‐club spatial convergence model across Italian regions over the period 1970 to 2000.     

valuation and analysis on the tourism resources in Hami Region based on GIS mapping technology

According to the data from the national standard classification and investigation of tourism resources（GB/T 18972-2003） in Hami region,the abundance,quality and dimensional distribution of the tourism resources in Hami region were evaluated based on GIS mapping technology.The evaluation results on the tourism resources in Hami region are described as follows：there are rich tourism resources categories; the quality of tourism resources is ordinary; the resources distribute equably; the number of the historical resources is much more than the natural resources,but the 1atter still has great potential for developing.All the results of the evaluation can provide important references for strategic decision making of Hami region.