基于节点运动的机会网络路由算法

机会网络利用节点移动带来的接触机会传输数据,数据在节点运动过程中捎带转发,保证了节点独立性,但会给数据传输带来影响.以节点的运动特性为切入点设计了基于运动的机会网络路由算法.综合考虑数据传输、数据内容以及应用需求等因素,设计了数据转发优先级评价模型,结合节点活动区间划分方案制定数据传输规则;设计了差异化副本传输策略,在...     

Mitigating expropriation risk through vertical separation of public utilities: The case of Argentina

In 2002, Argentina devalued its currency and froze public utility rates thus breaching the guarantees granted to investors the decade before. Those guarantees had lowered investors' cost of capital by substantially reducing expropriation risk. This paper looks into the governance structure chosen by Argentina for the privatization process and potential alternatives after a decade of contract breaches. Future governance should be market-oriented, involving vertically separated companies with former public utilities voluntarily acting as operating companies or OpCos, and NetCos in charge of all network expansions under the structure of PPPs created for such purposes.     

Levels of incomplete information in group decision models – A comprehensive simulation study

We present a comprehensive computational study on the effects of providing different forms of incomplete preference information in additive group decision models. We consider different types of information on individual preferences, and on weights of the group members, and study their effects on conclusiveness, efficiency and fairness of outcomes at the group level. Furthermore, we analyze possible violations of the axiom of independence of irrelevant alternatives (IIA) as well as the impact of problem characteristics, in particular initial agreement between group members. Our results indicate that providing information in the form of a ranking of differences between consecutive alternatives comes close to providing exact cardinal preference information in several outcome dimensions. However, group decision procedures based on incomplete preference information also show a significant amount of violations of the IIA axiom.     

大数据中效用挖掘的快速单阶段算法

现有数据挖掘算法的缺点是在挖掘大数据时会出现大量候选模式,从而造成可伸缩性瓶颈,个别算法虽然不生成候选模式,但是计算代价高昂,缺乏有效剪裁,运行效率存在瓶颈.为此,提出一个全新的单阶段不生成候选模式的数据挖掘算法,其创新性有3点:一是基于前缀生长的模式枚举和基于效用上限值评估的剪裁策略;二是基于稀疏矩阵和虚拟投影的效用信息表达;三是节省存储空间的深度优先搜索方法.大量实验表明,新算法的时间效率比现有算法高5倍以上,并且内存使用量比现有算法少20％～60％,可伸缩性高.     

The choice of optimal checking strategies for error control in structural engineering

Probabilistic models are given for estimatingthe error content in a structure afte.r thre" application of a checking strategy with given efficiency. The use of these models to optimize the level of effort expended on error control is illustrated. The analysis is carried out using-a Bayesian-decisiorv-theory approach,-and an overall model for structural decision-making is described. The applicability of the approach is illustrated by an example which considers the overall checking efficiency in the building process, combined with some failure statistics and failure cost estimates. The application of the approach to specific structural members is also discussed in the paper.     

管廊隧道开挖对上覆在建深基坑影响的三维有限元分析

以沈阳某盾构法综合管廊隧道下穿在建盖挖顺做法基坑为工程实例,在对工程实测数据进行分析基础上,利用小应变硬化本构模型进行三维有限元数值模拟研究,分析了盾构隧道下穿在建基坑引发的围护结构位移、水平支撑变形和基坑内既有结构变形。研究表明,利用小应变硬化本构模型可对盾构隧道下穿在建基坑问题进行较好的模拟;盾构隧道下穿基坑将引发围护结构顶部产生差异沉降;基坑内已施工完成的结构和水平支撑将发生"两边沉降大,中间沉降小"的上凸型变形;合理设计的立柱可有效控制盾构下穿引发的水平支撑沉降。     

燃煤电站锅炉低NOx燃烧技术初探

简要介绍目前的低NOx控制技术,为今后该领域的技术应用和发展提出几点建议。     

发电侧电力市场竞价交易模式及竞价策略风险的研究

研究了各种发电侧电力市场竞价交易模式,分析了它们的特点及对应的不同情况。在“厂网分开,竞价上网”的电力市场环境下,系统的运行条件和扰动场景更加复杂和不可预测,运行可靠性高于经济性的关系已不复存在,竞争各方都希望掌握其利益在各种风险下的变化情况,以便及早采取必要的预防和规避措施,尽量避免和减少经济损失。在综合考虑竞价策略和市场风险的基础上,对影响竞价策略的因素进行了分析,采用期望收益-风险效用函数来衡量交易参与者的市场策略。