特征指标

This paper uses mixture density networks to forecast the time-varying conditional density values of financial time series, and puts forth a new numerical algorithm to calculate Expected Shortfall. The application in Hong Kong Hangseng index approves that Value-at-Risk at high probability levels is accurate, and that it also has good forecasting ability in fluctuation. MDNs can effectively describe the empirical distribution of returns and the volatility mechanism, and is a new model for measuring financial market risk.

基于混合密度网络模型估计金融时间序列的时变条件密度，提出采用数值模拟方法计算Expected Shortfall的新途径，对香港恒生指数的实证研究表明，VaR的预测精度在高端分位点较好，模型评估指标反映出预测效果良好，混合密度网络可以有效地描述收益的经验分布统计特征和波动规律，是一种有效的金融市场风险测量模型。

Conformal mapping method is introduced into the analysis to calculate the characteristic values of the transmission line, e.

在分析中引入了保角映射等数值方法，给出了有效介电常数εeff、特征阻抗Z、单位电容C等传输线指标随几何参数变化的计算公式。

The research of this paper is began with the analysis the geographic spatial character of the UPTN, and designs the UPTN data mode based on GIS. Then, based on the good exhibiting all kinds of topology of the UPTN, and combined with the technology evaluation standards of the UPTN, this paper builds the UPTN planning mathematic model, and puts forward the quantitative calculation of the UPTN evaluation standards based on GIS; brings forward the arithmetic of the optimal path of the UPTN based on the public traffic network storage structure; designs the bus lines grouping management model, and realizes the contradistinctive evaluation of the UPTN planning projects based on GIS.

论文研究的重点内容是从分析城市公交网络中地理空间实体的特征开始，设计基于GIS的城市公交网络数据模型，在有效表现公交网络拓扑关系的基础上，根据公交线网技术评价指标，建立基于GIS的公交线网规划的数学模型，并给出公交线网评价指标的GIS量化计算方法；提出以公交线网数据存储结构为基础的公交网络最优路径算法；设计公交线路分组管理模型，实现公交线网规划方案对比分析。

The results showed that the UV254 and organic index have a certain special correlation curve in a river with steady water quality, and the correlation between the UV254 and the organic index is higher in a river with worse water quality than in a river with better water quality.

结果表明：在特定的、水质较稳定的河流中，UV254与有机指标有特定的相关曲线，水质差的河流中两者相关性高于水质较好的河流；在分布较广、水体特征不一的湖泊水库中其相关性较差。

In the chapter 6, an overall analysis and appraisal for the reliability, function/performance and economy of RMCS is made; an integral index and its corresponding formula which takes into account the system reliability and function/performance level together is proposed; moreover, taking the economical optimality analysis into account, a criterion for appraising the overall quality of RMCS is built; finally, a case study is given.

第六章对可靠微机控制系统的可靠性、性能及经济性进行了全面的分析和综合评定，提出了反映系统可靠性与功能/性能水平的统一指标及其计算公式，引入经济最优性分析后，建立了评估系统综合质量特征的准则和方法，最后研究了一个应用实例。

Moreover, thenotion of"Cumulative Degree","Cumulative Frequency" and"Cumulative Area"is established to describe the nature of spatial and temporal accumulation.

在此基础上，论文分析了区域开发环境影响累积的机理与过程，建立了相应的概念框架，并提出了描述区域开发环境影响累积特征的指标——"累积度"、"累积频率"、"累积效应区"和"累积影响区"。

There are two decalescence peak of the composite of wheat straw-PVC, and its melting point is not clear.

应用熔点和玻璃化转变温度这两项高分子材料的重要指标对麦秸与EVA、PE、PVC之间的热反应特征进行分析，可以了解它们之间的反应状况。

The third is lubricous degree, symmetry and unsymmetry of knee and ankle joint track.

摘 要：在次最大强度下改变骑行变量坐角与坐高，结果表明：恢复阶段的曲柄角速度及膝、踝关节轨迹特征的理论论证与实际结果具有很好的一致性；参与本次实验的自行车运动员坐角不应小于72°、坐高不低于106%th的定位较为合理；初步确认了踏蹬技术的三种运动学诊断指标即提拉阶段的曲柄角速度、不同组合下踏蹬时上、下死点区域的大小，膝、踝关节中心轨迹的重叠程度、光滑程度、对称性与非对称性。

This type of description could show the density of road network, its distribution and technical grading.

这种描述既可以反映出路网密度指标的特征以及路网分布的均匀程度，又能直接反映路网技术等级的层次性。

First, select four kinds of main risks source from bigly celebrate the main risk in region source, namely the flood, drought, sand-dust weather and petroleum pollution accident, etc. According to the different a request for to habitat, study this 19 kinds of landscapes ecosystem type of the Regional induce for 7 kinds of ecosystems system: Then the marsh of bulrush, lakes and reservoirs , salt alkali wasteland, prairie, island form wood, farmland, town. The difference is proceeded by characteristic according to each type ecosystem to the analysis of four kinds of main risks source, including the certain risk all rate, delimiting the space distribute, analyzing the risk strength to the receptor etc. At proceed the revelation the different from endanger to analyze the inside, this text borrows ecosystem index number that this index sign to reflect primarily habitat the ecosystem meaning of the type of habitat the different from position, with weak an index number to show the destructibility of the habitat, from but compute each ecosystem that is lost by ecosystem system an index number.

首先，从大庆地区主要的风险源中遴选出四种主要的风险源，即洪涝、干旱、沙尘天气和石油污染等；依据不同生物类群对生境的要求，将本研究区域的19种景观生态类型归纳为7种生态系统：即芦苇沼泽、湖泡库渠、盐碱荒地、草甸草原、岛状林、农田、城镇；对四种主要风险源的进行分析，包括确定风险概率，划定空间分布，对风险受体的作用强度分析等；在进行暴露和危害分析中，本文主要借生态指数这一指标来反映不同生境类型的生态意义和地位，以脆弱度指数来体现不同生境的易损性，从而计算出各受体生态系统的生态损失度指数；由于各主要风险物质对风险受体的作用强度是不同的，对形成区域性生态风险的作用大小也有差异，因此本文采用层次分析法对主要生态风险物质进行综合评价，并把判断矩阵排序权值的合理计算问题归为—非线性化问题，并提出用基于遗传算法(GA[5])的层次分析模型进行权重分析；进行风险表征，即综合前面两个阶段的信息，对环境中风险的性质和强度以及风险评价过程中不确定性问题进行分析与描述，并划分出五级生态风险区；最后，根据划分的五级生态风险区的特征，分别提出针对各生态风险区的生态风险管理对策。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐