卫星通信网系统最优业务分布算法研究

本文给出了一种低轨星座卫星通信系统业务模型,基于这种模型,考虑到卫星功率受限,提出了基于仰角、基于线性规划以及两者相结合等三种业务分布算法,通过数值分析比较,得出混合的分布算法具有最优性能。     

浮选柱浮选金矿矿泥半工业试验研究

本文介绍了某金矿应用浮选柱浮选矿泥所进行的半工业试验过程及结果分析。通过试验及数据分析,表明了浮选柱适合该金矿浮选矿泥,并能够取得比较好的技术指标。     

A behavioural model of traffic congestion: Endogenizing speed choice, traffic safety and time losses

Conventional economic models of traffic congestion assume that the relation between traffic flow and speed is a technical one. This paper develops a behavioural model of traffic congestion, in which drivers optimize their speeds by trading off time costs, expected accident costs and fuel costs. Since the presence of other drivers affects the latter two cost components and hence the Nash equilibrium speed, a ‘behavioural’ speed-flow relationship results for which external congestion costs include expected accident costs and fuel costs, in addition to the time costs considered in the conventional model. It is demonstrated that the latter in fact even cancel in the calculation of optimal congestion tolls. The overall welfare optimum in our model is found to be off the speed-flow function, and off the average and marginal cost functions derived from it in the conventional approach. This full optimum requires tolls to be either accompanied by speed policies, or to be set as a function of speed. Using an empirically calibrated numerical simulation model, we illustrate these qualitative findings, and attempt to assess their potential empirical relevance.     

An integrated model of downtown parking and traffic congestion

This paper is the first to look at cruising for parking from an economic perspective. We present a downtown parking model that integrates traffic congestion and saturated on-street parking; the stock of cars cruising for parking adds to traffic congestion. Two major results emerge from the model, one of which is robust. The robust one is that, whether or not the amount of on-street parking is optimal, it is efficient to raise the on-street parking fee to the point where cruising for parking is eliminated without parking becoming unsaturated. The other is that, if the parking fee is fixed at a sub-optimal level, it is second-best optimal to increase the amount of curbside allocated to parking until cruising for parking is eliminated without parking becoming unsaturated     

室内VOCs治理技术进展及发展趋势

文章介绍了一些VOCs的传统治理方法及各自应用范围,并就室内甲醛等挥发性气体的治理,详细介绍了具有发展前景的技术及其改进方法的进展。     

单片机应用的广阔前景

单片机发展极为迅速,当前世界上各大芯片制造公司都推出了自己的单片机,从8位、16位到32位等,但它们各具特色,互成互补,为单片机的应用提供广阔的天地。     

单层玻璃和双层玻璃遮阳系数测定检测方法解读

围绕单层玻璃和双层玻璃的遮阳系数测定方法,对太阳光谱的分区进行分析,根据单层玻璃和双层玻璃对太阳光通过玻璃的不同特性,详细阐述了GB/T 2680-1994的遮阳系数检测公式计算步骤,同时阐述国内其他的遮阳系数检测方法。     

万科集团资本结构问题探讨

改革开放以来,我国经济迅猛发展,特别是房地产行业对经济增长和投资增长的贡献较大,在我国经济发展史上扮演着不可或缺的角色。对于房地产企业而言,资本结构在企业运营中发挥着重要作用,已逐渐成为财务研究领域的热点。论文将万科股份有限公司作为研究对象,首先简要介绍企业的基本情况,其次通过数据分析其资本结构,发现存在的问题,最后提出针对性建议,以期在一定程度上为万科集团发展助力,促进行业整体的可持续健康发展。     

Evaluating quantile-bounded and expectile-bounded interval forecasts

In many different contexts, decision-making is improved by the availability of probabilistic predictions. The accuracy of probabilistic forecasting methods can be compared using scoring functions and insight provided by calibration tests. These tests evaluate the consistency of predictions with the observations. Our main agenda in this paper is interval forecasts and their evaluation. Such forecasts are usually bounded by two quantile forecasts. However, a limitation of quantiles is that they convey no information regarding the size of potential exceedances. By contrast, the location of an expectile is dictated by the whole distribution. This prompts us to propose expectile-bounded intervals. We provide interpretation, a consistent scoring function and a calibration test. Before doing this, we reflect on the evaluation of forecasts of quantile-bounded intervals and expectiles, and suggest extensions of previously proposed calibration tests in order to guard against strategic forecasting. We illustrate ideas using day-ahead electricity price forecasting.