The ALGACEA-1 method for the capacitated vehicle routing problem

We base the ALGACEA-1 method on Clarke–Wright's savings estimates, using Monte Carlo techniques for node selection. This procedure controls the assigned probabilities for node selection using a bounded Entropy function. Similarly, we have discussed the parameter tuning for this method with the purpose of obtaining a good algorithm performance. Finally, some computational results are given to show the quality of the solutions provided by ALGACEA-1 in a real case and in some benchmarking instances.     

Configuration for mass customization: how to extend product configuration towards requirements and process configuration

In order to develop mass customization, many companies use configuration software to customize their products. Although many studies already exist about Product Configuration, Requirements and Process Configuration have not been studied in detail. As all these three aspects must be considered for mass customization, the aim of this paper is to show how Product Configuration, when considered as a constraint satisfaction problem, can be extended upstream towards Requirements Configuration and downstream towards Process Configuration. Product Configuration basics are first reviewed thanks to a constraint based approach, and an analysis of industrial configuration situations is done in order to clarify mass customization needs in terms of configuration. Then upstream Requirements Configuration and downstream Process Configuration are defined and generic models are proposed. It is shown that the proposed elements allow a global and consistent flow of configuration activities. A detailed example illustrates the different configuration problems and a discussion terminates the paper.     

A multiprocessor based heuristic for multi-dimensional multiple-choice knapsack problem

This paper presents a multiprocessor based heuristic algorithm for the Multi-dimensional Multiple Choice Knapsack Problem (MMKP). MMKP is a variant of the classical 0–1 knapsack problem, where items having a value and a number of resource requirements are divided into groups. Exactly one item has to be picked up from each group to achieve a maximum total value without exceeding the resource constraint of each type. MMKP has many real world applications including admission control in adaptive multimedia server system. Exact solution to this problem is NP-Hard, and hence is not feasible for real time applications like admission control. Therefore, heuristic solutions have been developed to solve the MMKP. M-HEU is one such heuristic, which solves the MMKP achieving a reasonable percentage of optimality. In this paper, we present a multiprocessor algorithm based on M-HEU, which runs in O(T/p+s(p)) time, where T is the time required by the algorithm using single processor, p is the number of processors and s(p), a function of p, is the synchronization overhead. We also present the worst-case analysis of our algorithm, the computation of the optimal number of processors as well as the lower bound of the total value that can be achieved by the heuristic.     

Social problem solving as a mediator of the stress-pain relationship among individuals with noncardiac chest pain.

Objective: The present study tested the hypothesis that social problem solving (SPS) served to mediate the relationship between preceived stress and noncardiac chest pain (NCCP). Design: Adults undergoing stress myocardial perfusion imaging (MPI) to determine the presence of underlying cardiovascular disease related to the experience of chest pain were recruited prior to stress testing to complete a series of self-report inventories. Main Outcome Measures: MPI results were used to identify individuals with NCCP (N = 166; 91 men, 75 women; mean age = 53.92 years, SD = 11.98). Measures included perceived stress, SPS, and chest pain frequency and intensity. Results: In direct tests of the mediational effects of SPS, it was found that two problem-solving dimensions, negative problem orientation and rational problem solving, each served as significant mediators of the effects of stress on both NCCP intensity and frequency. Conclusion: These results support a mediational analysis of NCCP that includes stress and SPS. As such, it identifies SPS as a potentially important clinical target to consider when developing future psychosocial-based therapy protocols for treating individuals with NCCP. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

On the inverse problem of soil profile reconstruction: a comparison of time-domain approaches

We discuss a one-dimensional inverse material profile reconstruction problem that arises in layered media underlain by a rigid bottom, when total wavefield surficial measurements are used to guide the reconstruction. To tackle the problem, we adopt the systematic framework of PDE-constrained optimization and construct an augmented misfit functional that is further endowed by a regularization scheme. We report on a comparison of spatial regularization schemes such as Tikhonov and total variation against a temporal scheme that treats the model parameters as time-dependent. We study numerically the effects of inexact initial estimates, data noise, and regularization parameter choices for all three schemes, and report inverted profiles for the modulus, and for simultaneous inversion of both the modulus and viscous damping. Our numerical experiments demonstrate comparable or superior performance of the time-dependent regularization over the Tikhonov and total variation schemes for both smooth and sharp target profiles, albeit at increased computational cost. Support for this work was provided by the US National Science Foundation under grant awards ATM-0325125 and CMS-0348484.     

焦化废水处理系统的改造及调试

黑猫焦化公司的焦化废水采用生化处理方式,因原系统工艺不合理且设施不全,致使出水质量差.改造后,系统通过水质调节、厌氧水解酸化、缺氧生物脱氮、好氧生物的硝化、泥水分离、混合反应、后混凝系统的沉淀及污泥压滤等工序逐级处理,污水得以净化,系统出水指标除氰化物外,均达到国家排放标准.COD、氨氮、酚去除率分别达到97.3%～98.6%、98%～100%、99%～100%.后混凝系统对CODcr的去除率约为30%.氰化物的去除效果有待进一步研究.     

外墙保温施工中易出现的质量问题及防治措施

为了实现节能降耗、保护环境的国策及住宅舒适性要求,总结了外墙保温施工中常见的质量问题,从材料、施工两方面分析了质量通病产生的原因,并提出了相应的防治措施,从而推动建筑节能工作的顺利进行。     

我国桥梁发展史及现存的问题

介绍了我国桥梁的发展历程和一些历史著名桥梁的相关情况,说明了我国古代桥梁建设取得的辉煌成就,分析了现在的桥梁建设取得的成就和必须正视的问题,以促进我国桥梁的发展。     

科学发展观下的建设行业安全生产工作思考

针对安全生产的重要性,介绍了山西省建设行业和建设领域的安全生产总体情况,研究了建设行业安全生产面临的形势,分析了建设领域安全生产工作中存在的六大问题,并提出了相应的建议,从而确保建设行业和领域的安全生产.     

双调度交换机组网运行的安全保障对策

随着电网的不断发展,对电力调度通信稳定性的要求越来越高.2007年,福建电力系统省调和地调等一些重要调度部门和单位,已经采用双调度交换机组网的运行方式,在避免整个调度通信系统出现瘫痪状态、减少故障恢复时间和减轻运行维护压力等方面具有重要的优势.由于双调度交换机组网运行系统较为复杂,双调度交换机组网技术仍有一些问题需要完...