基于混合优化算法的带时间窗的车辆调度问题求解研究

论文建立了带时间窗的车辆调度问题的数学模型，并针对遗传算法在局部搜索能力方面的不足，提出将模拟退火算法与遗传算法相结合，从而构造了求解车辆调度问题的混合优化算法，并进行了实验计算。计算结果表明，用这种混合优化算法求解车辆调度问题，可以在一定程度上用模拟退火算法突跳性克服遗传算法在局部搜索能力方面的不足，从而得到质量较高的解。     

遗传算法在工程结构优化中的应用研究

首先介绍了遗传算法，接着将遗传算法与传统优化算法作了比较，然后介绍几种遗传算法改进的策略，接着通过一个简单的例子验证了遗传算法是求解全局最优解的一个有效方法，同时介绍遗传算法在实际应用中经常使用的几种改进方法，最后探讨了遗传算法与传统优化方法，BP神经网络，Hopfied神经网络，模拟退火算法，通用有限元软件的结合，以期能更好地解决复杂工程结构的优化问题。     

蚁群遗传混合算法在求解旅行商问题上的应用

针对在求解旅行商问题时,蚁群算法易陷入局部最优,而遗传算法收敛速度慢等问题,将蚁群与遗传算法相结合:把蚁群算法每次迭代的结果作为遗传算法的初始种群,并且用遗传算法寻优结果更新蚁群算法的信息素。在用遗传算法处理问题的阶段,引入了两种新的交叉算子,并且提出混合交叉算子的新思想,算法的后期使用贪心搜索和2-opt局部优化算法,成功的避免了算法过早陷入局部最优解的问题,加快了算法的收敛速度。通过仿真,本算法与其他算法进行对比,寻优路径长度明显降低,在求解效率和求解质量上都有更好的效果。     

一种求解装箱问题的混合算法

针对一维装箱问题,在考虑遗传算法早熟收敛问题和禁忌搜索算法自适应优点的基础上,将遗传算法和禁忌搜索法结合起来,提出了基于遗传和禁忌搜索的装箱优化算法,与简单遗传算法相比,该算法具有更好的收敛性能。最后通过实例验证了算法的有效性。     

基于蚁群算法在TSP问题中的仿真分析

在移动机器人路径规划TSP问题中选取蚁群算法和遗传算法的matlab仿真作为研究重点,根据算法的特点分析了蚁群算法的主要参数例如启发信息影响程度的表达因子;信息素挥发系数,蚁群中的蚂蚁数量等对TSP问题规划最优解和效率的影响,同时对比遗传算法对TSP问题的仿真分析,得出蚁群算法的效率优势和遗传算法的稳定性优势,为进一步的两种算法优势互补融合研究做铺垫。     

基于混合遗传算法的多配送中心选址问题研究

就区域配送体系的多配送中心选址问题构建确定性规划模型，相应提出混合遗传算法的求解方法。该算法结合了单亲进化遗传算法和经典遗传算法的优点，能够使部分种群择优进化的同时整体种群的解全局收敛。仿真案例表明算法能够在5％的误差限内有效、稳定的逼近全局最优解，生成的选址线路图具有实践指导价值。     

基于混沌遗传算法的虚拟维修拆卸序列规划研究

将经典遗传算法和混沌算法相融合,提出一种混沌遗传算法,该算法可以用于解决虚拟维修拆卸序列优化问题。     

基于改进遗传算法的TSP问题优化研究

旅行商问题（TSP问题）已经被证明属于NP完全问题。遗传算法是一种模拟自然界中生物的进化机制的优化策略．是一种基于群体、隐并行搜索策略，是求解TSP问题效率相当高的一种算法。因此．本文提出使用改进的遗传算法．即用个体数量控制选择策略以保证群体的多样性，用顺序交叉算子和部分路径翻转变异算子来提高算法的收敛速度．较好地解决了群体的多样性和收敛速度的矛盾。算法的分析和测试表明．该改进算法的是有效的。     

基于公交车开展物流配送的车辆路径优化问题

本文主要研究基于公交车开展物流配送的车辆路径优化问题，通过一种新型的城市物流配送模式来缓解城市拥堵、减少物流配送总成本。该配送模式分为公交车配送和配送车辆配送两层，利用公交车的剩余容量来减少运输成本。同时建立了总成本最小为目标的优化模型，并使用改进的遗传算法对模型进行求解。本文在遗传算法生成种群的过程中，采用模拟退火算法进行优化拓展解的空间，提高改进算法的全局和局部空间搜索能力。最后经实例验证，改进的遗传算法能够找到更短的行驶路线，验证了算法的有效性。     

基于粒子群优化的模糊聚类分析

基于求解实优化问题时,粒子群优化算法优于遗传算法。在基于遗传算法的模糊C均值聚类算法基础上,给出了基于粒子群的模糊C均值聚类算法,试验结果表明:该算法克服了传统的模糊C均值聚类算法的缺陷,同时在收敛速度方面明显优于基于遗传算法的模糊C均值聚类算法。     

Analysis of high dimensional multivariate stochastic volatility models

This paper is concerned with the Bayesian estimation and comparison of flexible, high dimensional multivariate time series models with time varying correlations. The model proposed and considered here combines features of the classical factor model with that of the heavy tailed univariate stochastic volatility model. A unified analysis of the model, and its special cases, is developed that encompasses estimation, filtering and model choice. The centerpieces of the estimation algorithm (which relies on MCMC methods) are: (1) a reduced blocking scheme for sampling the free elements of the loading matrix and the factors and (2) a special method for sampling the parameters of the univariate SV process. The resulting algorithm is scalable in terms of series and factors and simulation-efficient. Methods for estimating the log-likelihood function and the filtered values of the time-varying volatilities and correlations are also provided. The performance and effectiveness of the inferential methods are extensively tested using simulated data where models up to 50 dimensions and 688 parameters are fit and studied. The performance of our model, in relation to various multivariate GARCH models, is also evaluated using a real data set of weekly returns on a set of 10 international stock indices. We consider the performance along two dimensions: the ability to correctly estimate the conditional covariance matrix of future returns and the unconditional and conditional coverage of the 5% and 1% value-at-risk (VaR) measures of four pre-defined portfolios.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

The Geography of Innovation in China and India

The BRICS countries in general, and China and India in particular, are now widely regarded as the areas of the world likely to challenge the economic leadership of the United States (US) and the European Union (EU). A large part of this challenge will come from rapid technological catch‐up by China and India. Yet, despite a recent rise in interest, there is limited knowledge about how and where innovation takes place in these two leading emerging countries and to what extent the Chinese and Indian territorial systems of innovation differ from those in the EU or the US. In this article we explore the geography of innovation in China and India, concentrating on understanding key territorial‐level innovation trends by country, region and technology field, using the US and the EU as benchmarks. We find significant contrasts between the geography of innovation in China and India and that of the US and the EU. First, the degree of concentration of innovative activities in both countries is extremely high. Levels of agglomeration of innovation in the coastal provinces of China, as well as in Delhi and the South of India, significantly exceed the levels of agglomeration found in the USA and the EU. Secondly, China has witnessed a more rapid increase in the degree of concentration of innovation than India. We posit that the differences in the geography of innovation between, on the one hand, China and India and, on the other hand, between these countries and the developed world are rooted in different institutional settings, different systems of innovation and different national innovation strategies.     

关于城市本质的理论探索

文章界定了城市的本质定义.提出了城市本质构成的三大基础理论:人性理论、需要理论、环境理论;阐述了认识城市本质的理论意义和现实意义.文章认为,城市本质体现了人本主义思想,体现了人在城市发展中主导作用和不可推卸的历史使命.正确认识城市本质,将为我国科学制定城市发展战略和城市规划,合理有效地经营、建设和管理城市提供科学的理论依据.     

Institutionalization of ‘The Property Mind’

This essay discusses the idea of ‘the culture of property’ and whether it combines the economic and cultural explanations of gentrification. To explore the idea of a culture of property in the case of Singapore, it examines both what motivates Singaporeans to invest in real estate (e.g. nostalgic feelings, duty, guilt, moral economy, face, filial piety towards ancestors and a way to remember their origins as reasons for investing in properties in China), and the institutions in the property state of Singapore (e.g. the possibility of owning and selling public housing, collective sales legislation that encourages collective profitmaking and the pension system) that increase Singaporeans' appetite for property and make them watchers of the property market. Lastly, the essay discusses the consciousness of evictions and of class differences and notes the random and unfair nature of the property market. It ends with a call for further research on real estate and property development, and their role in increasing urban inequality.     

公路工程施工组织设计探析

近些年,国家对基础性建设的投入越来越大,我们的公路建设也日益增多。公路工程是一项综合性、系统性较强的工程,是集路基、路面、路线、桥涵、隧道等于一体的综合体系。随着经济社会的发展和施工工艺的不断进步,人们对公路工程的要求也更加严格。为了保证公路建设的正常施工,就需要工程设计按时按量完成。而如何处理好质量与工期的矛盾则是公路设计者面临的难题。本文对公路工程设计的重要性,步骤等进行一个分析研究。     

农电服务公司业务外委工作探究

农网企业处在电网的末端,服务对象是广大农民,它关系农村经济社会的发展和稳定,农电企业是建设社会主义新农村和和谐社会的组成部分。实施农村供电所业务委托,深化农村供电所专业化、精益化管理,加快提升服务"三农"水平,是公司深入贯彻落实科学发展观,推进"两个转变",规范农电用工(原"农电工",下同)管理,维护队伍稳定的重要举措,农村供电所业务委托试点工作取得成功,为农村供电所业务的专业化分工、社会化运作积累了实践经验,验证了农村供电所业务委托模式的科学性和可行性。推广实施农村供电所业务委托工作,将供电所有关业务委托农电业务受托公司,转变供电所管理模式,是供电公司业务组织方式的有益探索,是企业管理创新的重要内容和具体体现,本文对农电服务公司业务委托的现状、存在意义和管理改进措施进行了分析。     

浅谈贝氏体钢钢轨、辙叉、尖轨在朔黄线的应用

随着朔黄铁路运量的增加,运输压力越来越大,对线路设备质量的要求越来越高。钢轨、道岔是线路设备中最重要的环节,辙叉、尖轨又是道岔的关键部件。实践表明,贝氏体钢辙叉、尖轨、基本轨采用大大提高了道岔使用寿命,增加了安全系数,创造更多的经济效益和社会价值。     

WHAT'S TO KNOW ABOUT THE CREDIBILITY OF EMPIRICAL ECONOMICS?

The scientific credibility of economics is itself a scientific question that can be addressed with both theoretical speculations and empirical data. In this review, we examine the major parameters that are expected to affect the credibility of empirical economics: sample size, magnitude of pursued effects, number and pre‐selection of tested relationships, flexibility and lack of standardization in designs, definitions, outcomes and analyses, financial and other interests and prejudices, and the multiplicity and fragmentation of efforts. We summarize and discuss the empirical evidence on the lack of a robust reproducibility culture in economics and business research, the prevalence of potential publication and other selective reporting biases, and other failures and biases in the market of scientific information. Overall, the credibility of the economics literature is likely to be modest or even low.     

Politics in the Informalizing Metropolis: Displacement,Resettlement and Unstable Negotiations in Uncivil Ahmedabad

This article documents the displacement of Baoris, an adivasi (indigenous) community living in the city of Ahmedabad, India, and their subsequent resettlement along the city's precarious urban–rural frontier. I argue that this process signals the informalization of rights and territories, representing a political regime of governing in the remaking of the contemporary Indian metropolis. Recent actions taken by the Ahmedabad Municipal Corporation to evict Baoris from the inner city are situated within the entangled processes and politics of urban restructuring, liberalization and Hindu nationalism. The absence and erosion of democratic protections, however, has not precluded the possibility of political negotiations with the local agents of state and capital, and this article assesses the tactics that community residents have deployed in their bid to maintain claims to territory, labour and services. I end by tempering enthusiasm for the informalizing city as a site for realizing alternative forms of justice and possible democratization.