过氧乙酸杀菌剂制备工艺的优化研究

过氧乙酸不仅是一种良好的氧化剂,而且是一种广谱、高效、速效、廉价的灭菌剂,应用广泛。通过改变物料配比、反应物浓度、催化剂用量等工艺条件,优化制备过氧乙酸工艺条件。     

供应链库存优化管理模型研究

供应链库存管理是供应链管理的重要组成部分,如何设置和维持一个合理的订货量和库存水平量,以平衡存货不足带来的短缺风险和损失,以及库存过多所增加仓储成本和资金成本,成为一个企业必须回答的问题。本文从供应链整体角度出发,提出了在缺货费用很小以至于可忽略的前提下,适应供应链模式下,新的库存控制优化模型,并以简单实证加以研究。     

高职院校军事理论课教学存在问题及其优化对策研究

近些年,我国各高职院校军事理论课教学虽有显著的成绩,但是,在军事理论课教学中,仍存在一些问题需要客观正视并解决。基于此,笔者根据从事军事理论课教学经验,首先分析了高职院校军事理论课教学中存在的主要问题,然后指出了军事理论课教学优化原则,同时提出了加强高职院校军事理论课教学的优化对策,旨在提高高职院校军事理论课的教学水平。     

Diversified behavioral portfolio as an alternative to Modern Portfolio Theory

The traditional mean–variance approach has been complemented by alternative theories that use risk measures different from standard deviation of returns or involve additional distributional features of returns like skewness and kurtosis. We propose a portfolio choice model that combines different distributional characteristics of the returns in the decision-making making process, considering preferences of investors which are modeled as non-statistical uncertainties of investors using fuzzy theory. We use 20 stocks of the S&P500 from January 2013 to December 2017. We assess the obtained portfolios’ performance, and the diversified behavioral portfolios outperform than the mean–variance portfolio. This methodological proposal can be seen as a strong managerial tool to make investment portfolio decisions.     

浅析工业设备支撑体系方案优化的思路

设备承重支撑体系是一种特殊的结构形式,在我国工业项目中的应用范围越来越广,设备支撑结构体系类似于民建钢框架结构、钢框架-支撑结构体系。重型设备的支撑点主要集中在结构体系的局部楼层,导致上下楼层质量、刚度比例偏差较大,设备布置偏心,不满足抗震设防要求[1]。随着传统工业的工艺技术不断革新、新型工艺技术的发展、重型设备的出现,优化钢结构承重支撑体系势在必行。在满足承载能力和使用要求的前提下,可打破常规规则与相对不规则结构形式间的界限。依据结构专业设计条件[2]、操作楼层和承重楼层分别设计的优化思路,对降低钢材用量、节约项目成本具有现实意义。鉴于此,论文主要对现阶段工业承重体系的优缺点进行分析,提出其承重钢结构体系优化的构想和措施。     

山区高速公路施工成本控制——优化大临工程及设计方案节约施工成本

本文以承秦高速三标为背景,通过优化施工便道、临时电力、弃土场、拌和站、梁场等大临工程施工方案,优化隧道、桥梁设计方案,有效降低了施工成本,取得了较好的经济效益,对山区高速公路施工成本管理有一定的借鉴意义。     

基于物流服务供应链模式的供应商选择研究

针对物流服务供应链中集成商对功能型物流服务提供商的评估选择问题,描述了物流服务的采购流程。通过建立多目标规划的数学模型,引入最大满意度的求解方法,探讨了物流服务集成商对功能型物流服务提供商的选择与优化组合问题。最后通过对算例的分析,证明了模型的有效性和实用性。     

Determining optimal fuel delivery strategies under uncertainty

During the preparation before a hurricane makes landfall, affected individuals may be asked to evacuate. Large and small-scale evacuations can cause rapid increases in the demand for gasoline fuel. However, during a hurricane vessels carrying gas may be delayed and/or rerouted, adding to the difficulty of providing the necessary gas in affected areas. In this work, we determine alternate delivery locations and times for vessels carrying fuel that are scheduled to arrive and deliver fuel at ports impacted by an approaching hurricane. Motivated by Hurricane Irma in Florida, we develop a multi-period stochastic scheduling model that incorporates hurricane (weather) advisories, fuel delivery schedules, port storage capacities, and port docking capacities. Our model determines the best schedule based on two objectives: (1) minimize the total unmet demand at each port, and (2) minimize inequities in unmet demands among the ports. We also present a case study and a numerical experiment based on fuel delivery data from ports in Florida. Among our key findings is that port availability is the driving factor in determining feasible schedules for vessel gas deliveries. We also present a scheduling heuristic that dynamically adapts to weather advisories so as to minimize the impact of unmet demand in the affected areas.     

优化设计方案控制工程造价

工程造价控制应贯穿于项目建设的全过程,有效控制建设工程造价的重点是优化设计方案。优化设计方案主要采用设计招投标及其设计方案竞选、运用价值工程优化设计方案和设计方案的技术经济评价。     

武汉城市圈的产业一体化

随着经济全球化和区域经济一体化的不断深入,区域产业协作已经成为区域经济发展的重要环节。中国城市与区域发展的重要趋势便是以大城市为核心的城市经济圈的迅速崛起。而城市经济圈形成和发展的核心是产业一体化。文中从分析武汉城市圈产业一体化的现状及内外在动力机制,使各市应该重点发挥自身的优势产业,在良性竞争的背景下,加强分工协作,提高生产效率,促进经济发展。