Effective and equitable supply of gasoline to impacted areas in the aftermath of a natural disaster

The focus of this research is on supplying gasoline after a natural disaster. There are two aspects for this work: determination of which gas stations should be provided with generators (among those that do not have electric power) and determination of a delivery scheme that accounts for increased demand due to lack of public transportation and considerations such as equity. We develop a mixed integer program for this situation. Two case studies based on Hurricane Sandy in New Jersey are developed and solved in CPLEX. As expected, increasing equity increases cost and also tends to place generators to stations with large initial inventories. It is further observed that CPLEX can solve the largest instances of the problem for a 5% tolerance gap, indicating that the model is efficient.     

A logistics model for emergency supply of critical items in the aftermath of a disaster

This paper proposes a logistics model for delivery of prioritized items in disaster relief operations. It considers multi-items, multi-vehicles, multi-periods, soft time windows, and a split delivery strategy scenario, and is formulated as a multi-objective integer programming model. To effectively solve this model we limit the number of available tours. Two heuristic approaches are introduced for this purpose. The first approach is based on a genetic algorithm, while the second approach is developed by decomposing the original problem. We compare these two approaches via a computational study. The multi-objective problem is converted to a single-objective problem by the weighted sum method. A case study is presented to illustrate the potential applicability of our model. Also, presented is a comparison of our model with that proposed in a recent paper by Balcik et al. [6]. The results show that our proposed model outperforms theirs in terms of delivering prioritized items over several time periods.     

基于景观生态安全格局的泥石流多发城镇防灾、减灾体系构建--以昆明市东川区为例

通过对泥石流灾害形成原因及对城镇造成危害的调查分析,提出泥石流多发城镇的灾害防御应首先从土地资源的保护和利用以及景观的战略布局着手,在城市避难疏散系统的构建中统筹兼顾各类城市灾害的危害性.采取灾害测报系统及布局、生命线保障系统规划,救灾设施及布局、抗灾防灾工程建设和疏散及避难通道规划等五项工程性措施,通过防灾救灾组织指挥体系建设、救灾队伍建设、灾害应急预案的制定、防灾救灾的宣传教育和灾害政策法规建设等五项非工程性措施的支撑,从根本上达到防灾减灾的目标,构建生态安全的城市.     

建筑工程项目钢筋管理策划的应用

随着社会的不断进步,建筑业迎来了发展机遇期,传统建筑企业对工程自身的要求会逐渐增多,不但要关注施工的质量、安全、进度,而且更加关心工程施工成本。为了做好施工中的工程成本控制,就要做好前期的规划和策划,特别是对钢筋、混凝土、木料等工程主材的管理策划,再配合施工进度的推进,监督施工过程中的主材消耗,在保证工程施工进度的前提下,实现企业效益的最大化。因此,论文主要探讨了建筑工程项目钢筋管理策划的应用。