基于Logistic回归模型的电动自行车出行特征分析

本文基于电动自行车使用者和非电动自行车使用者抽样调查数据,从居民收入、出行距离和时耗等方面采用Logistic模型进行分析,建立了基于Logistic的电动自行车出行方式选择模型,并且计算了电动自行车的出行距离和时耗曲线.本文的研究成果填补了目前自行车交通研究的一项空白,为政府机构制定相关政策提供了基础研究支持.     

Mining factors affecting taxi drivers’ incomes using GPS trajectories

Taxis provide essential transport services in urban areas. In the taxi industry, the income level remains a cause of concern for taxi drivers as well as regulators. Mining underlying factors affecting the income level will not only benefit the newcomers and low-income drivers but also assist in developing effective optimization algorithms for taxi operations. This paper intends to disclose the factors affecting incomes along with their quantitative influence by mining over 167 million GPS records from nearly 8000 taxis in Shanghai. We first identify a marked difference in drivers’ incomes and categorize drivers into three income levels accordingly. We next investigate the overall search-delivery process, thereby defining several factors that may affect the income level. We then develop a generalized multi-level ordered logit (GMOL) model to find the significant factors that influence incomes. Finally, we compute the elasticity for those significant factors and present their contributions, as well as challenge some preconceived ideas regarding how to earn high incomes.     

The use of hydrogen as a fuel for inland waterway units

Escalating apprehension about the harmful effects of widespread use of conventional fossil fuels in the marine field and in internal combustion engines in general, has led to a vast amount of efforts and the directing of large capital investment towards research and development of sustainable alternative energy sources. One of the most promising and abundant of these sources is hydrogen. Firstly, the use of current fossil fuels is. discussed focusing on the emissions and economic sides to emphasize the need for a new, cleaner and renewable fuel with particular reference to hydrogen as a suitable possible alternative. Hydrogen properties, production and storage methods are then reviewed along with its suitability from the economical point of view. Finally, a cost analysis for the use of hydrogen in internal combustion engines is carried out to illustrate the benefits of its use as a replacement for diesel. The outcome of this cost analysis shows that 98% of the capital expenditure is consumed by the equipment, and 68.3% of the total cost of the equipment is spent on the solar photovoltaic cells. The hydrogen plant is classified as a large investment project because of its high initial cost which is about 1 billion US$; but this is justified because hydrogen is produced in a totally green way. When hydrogen is used as a fuel, no harmful emissions are obtained.     

改进我国个人所得税征税对象的思考

个人所得税是一个良税，具有很强的聚财和调控功能，而我国现行的个人所得税制度却不尽合理，影响了其功能的正常发挥。笔者认为，完善个人所得税制度的关键是重新思考其征税对象，据此，本文在理论分析基础上对个人所得税的征税对象提出了改进建议。     

企业虚假确认收入的手段分析

介绍了企业在收入确认方面出现的各种不正当行为以及针对这些行为应当如何正确对待。     

筑路机械完好率、利用率、效率与其经济效益的关系探讨

目前在对道路施工企业的施工机械进行考核中,存在许多问题,这使一些机械管理人员仅仅注意机械的完好率与利用率,而忽略了机械的经济效益。本文通过对现行机械考核指标:完好率、利用率与效率的分析,指出了其先天不足,提出应建立一套新的指标即:利用率、费用率、收入率、综合效率来考核机械和评价机械管理部门的管理水平。在对新指标进行评价之后,对它们的层次作了划分,并对提高机械综合效率这一目标的实现,提出了自己的看法。     

基于空间意义的高速公路收费价格体系模型

为了满足高速公路收费管理的需要，借鉴经济学模式，通过对收费价格的浮动控制，建立基于空间意义的高速公路收费价格体系模型。对空间意义上的不同地区实行差异化价格控制，起到车辆的引导分流作用，也会使公路资源得到充分利用。     

规模经济原理与高速公路养护规模

以规模经济理论为基础 ,对高速公路养护中规模收益的存在性、相关性、变化趋势、影响因素进行了讨论 .     

企业会计新准则中所得税问题的解析

针对财政部2006年2月颁布的《企业会计准则第18号—所得税》及其在上市公司中的应用,对新旧会计准则进行了对比分析,探讨了新准则中计税基础、暂时性差异、资产负债表债务法等相关问题。     

Chebyshev Fitting Way and Error Analysis for Propeller Atlas across Four Quadrants

A Chebyshev fitting way for a propeller atlas across four quadrants is discussed. As an example, Chebyshev polynomialfitting results and its error analysis are given. Because it's difficult generally to get a propeller atlas across four quadrants,a wayis used to construct an alternative with higher accuracy based on the properties. As an application example, an alternative forthe propeller property of a Deep Submergence Vebicle across four quadrants is given practically and a simulation model of the