数字化成图软件在公路线形设计上的应用研究

本文试图通过对地形、地籍数字化成图软件功能的改进,包括公路线形设计、纵横断面图的绘制和设计、土石方的计算与调配,以及各种数据表格的自动输出等,实现操作轻松快捷、简单准确,满足公路设计单位的需要,提高工作效率。     

导游工作倦怠及其影响因素的调查

本文通过对导游工作倦怠的调查 ,以探讨影响导游工作倦怠的因素 ,以及工作倦怠对导游身心健康和工作满意度的影响。在分析调查结果的基础上 ,提出了降低导游工作倦怠的建议。     

Modeling time series information into option prices: An empirical evaluation of statistical projection and GARCH option pricing model

This paper compares the empirical performances of statistical projection models with those of the Black–Scholes (adapted to account for skew) and the GARCH option pricing models. Empirical analysis on S&P500 index options shows that the out-of-sample pricing and projected trading performances of the semi-parametric and nonparametric projection models are substantially better than more traditional models. Results further indicate that econometric models based on nonlinear projections of observable inputs perform better than models based on OLS projections, consistent with the notion that the true unobservable option pricing model is inherently a nonlinear function of its inputs. The econometric option models presented in this paper should prove useful and complement mainstream mathematical modeling methods in both research and practice.     

Linkage Disequilibrium Mapping of Disease Susceptibility Genes in Human Populations

The paper reviews recent work on statistical methods for using linkage disequilibrium to locate disease susceptibility genes, given a set of marker genes at known positions in the genome. The paper starts by considering a simple deterministic model for linkage disequilibrium and discusses recent attempts to elaborate it to include the effects of stochastic influences, of "drift", by the use of either Writht-Fisher models or by approaches based on the coalescence of the genealogy of the sample of disease chromosomes. Most of this first part of the paper concerns a series of diallelic markers and, in this case, the models so far proposed are hierarchical probability models for multivariate binary data. Likelihoods are intractable and most approaches to linkage disequilibrium mapping amount to marginal models for pairwise associations between individual markers and the disease susceptibility locus. Approaches to evalutation of a full likelihood require Monte Carlo methods in order to integrate over the large number of unknowns. The fact that the initial state of the stochastic process which has led to present-day allele frequencies is unknown is noted and its implications for the hierarchical probability model is discussed. Difficulties and opportunities arising as a result of more polymorphic markers and extended marker haplotypes are indicated. Connections between the hierarchical modelling approach and methods based upon identity by descent and haplotype sharing by seemingly unrelated case are explored. Finally problems resulting from unknown modes of inheritance, incomplete penetrance, and "phenocopies" are briefly reviewed.     

增强地勘测绘单位竞争力的对策思考

文章针对地勘系统测绘单位增强市场竞争力所面临的诸如改革创新推动力减弱、整体经济实力薄弱、人才结构和知识结构难以适应市场竞争等问题 ,提出六项对策 ,主要是深化改革、建立技术创新机制、营造良好的经营环境、倡导品牌经营、强化内部管理、加强企业文化建设等     

发达国家产业集群发展历程及对中国产业集群提升政策的启示

在过去的10年中,集群提升政策被广大政策制定者和研究者所鼓吹。西方国家一些成功的集群更是争相被广大发展中国家所复制和学习。但是,在全球化过程中这些集群范本发展演变趋势被忽视。另外,缺少一个广为接受的集群定义,弱化了集群提升政策制定过程当中对集群的界定。关注集群这两个＂副作用＂对中国产业集群提升政策的制定有匡正作用。     

全球气候变化背景下低碳旅游研究进展及可视化分析

低碳旅游研究是气候变化背景下旅游研究的前沿问题和关键领域。以Web of Science核心合集、CSSCI及CSCD数据库中关于低碳旅游的文献为基础,利用CiteSpace软件、Alluvial Generator程序、Excel统计功能进行国内外低碳旅游研究的可视化分析。结果表明：国外低碳旅游研究起步时间早,始于系统外部与旅游业相互作用视角,以生态环境和工程技术学科为基础,主要为了解决“碳中和”等现实问题,已形成固定的区域性合作网络;国外研究以定量研究为基本范式,其关键文献全部围绕旅游碳排放的测算,且已经形成了较完善的减碳体系。而国内低碳旅游研究与国外的快速发展时期相吻合,是从旅游业可持续发展角度开展研究,依附于旅游及经管类学科,尚未形成固定的合作网络;国内研究在概念理论的定性研究方面优于国外,但整体研究视角较为单一且未形成完整体系,其关键文献包含基础概念、理论体系、碳排放测算、影响因素分析等诸多方面。     

基于价值流图析的生产线连续流创建

针对M企业A生产线在制品积压、交付周期长等问题，通过现状价值流图分析其原因，提出在考虑改善效益大于投入成本的条件下，选择合适的自动化水平，以克服物料供应不及时、工艺特性等制约因素。从工艺流程、布局、工装等方面进行改善并绘制未来价值流图，创建生产线连续流。生产线连续流创建后，生产周期缩短了13天、搬运距离减少41m、车间面积节省约168m2、作业人数减少6人，为企业降本增效打下了坚实基础。     

A systematic mapping study on enterprise architecture mining

Enterprise architecture allows companies to deal with digital transformation through the proactive presentation and alignment of business and IT in a holistic manner. One important challenge is EA modelling since it is time-consuming (thus expensive), error-prone, and biased owing to experts’ subjective opinions. This challenge might consequently be addressed through automatic EA modelling. We conducted a systematic mapping study to classify and evaluate the research concerning EA mining proposals developed specifically for TOGAF and Archimate. After analysing results, we concluded that the research field is not sufficiently mature and further research on EA mining is necessary.     

Economic Development and South Africa: 25 Years Analysis (1994 to 2019)

Economic Development highlights the growth and progression of every nation towards prosperity, and South Africa is not an exception to this phenomenon. Present article reviews economic progression in South Africa for last 25 years of time by applying systematic literature review and bibliometric analysis (1,241 articles) on Scopus extracted database (1994 to 2019; until 06 June). Inferences evidence significant work contributed by top universities, authors, funding sources, journals and citation statistics. Noticeably, implementation of a concept solely will not fetch real situation; however, a systematic review extends good to excellent understanding of the considered research agenda. Findings reveal the contradictory inter-connectivity of Cluster 1 Economic Inequality and Poverty, Cluster 2 Developing Country and Corruption and Cluster 6 Economic Development and Economic Policy. It is very important to understand that if a nation is facing economic inequality, corruption, and poverty; how it can achieve the status of economically developed nation. Identification of Cluster 3 Industrialization and Industry 4.0, Cluster 4 Unemployment and Entrepreneurship Education and Cluster 5 Sustainable Development and Economic Growth signifies scope of improvement. Conclusively, the researcher has proposed a conceptual model to address above stated concerns.