Exponentially Weighted Moving Average Chart and Two‐Component Measurement Error

The two‐component measurement error (TCME) model effectively quantifies both the additive and multiplicative errors in analytical measurements. The performance of control charts in presence of TCME model has been investigated by researchers in recent past, but these studies are based on only considering fixed levels for the two‐component model parameters. In this study, we investigated the exponentially weighted moving average chart's performance in presence of TCME for varying levels of two‐component model parameters. A cost function analysis is also presented to determine the optimal number of multiple measurements and the sample size for reducing the effect of TCME. Copyright © 2015 John Wiley & Sons, Ltd.     

COMPARISON OF BRANCH AND BOUND AND ITERATIVE HEURISTIC ALGORITHMS FOR FLOOR ALLOCATION OF ACTIVITY CLUSTERS IN MULTISTOREY BUILDINGS

The paper presents a branch and bound algorithm and an iterative heuristic algorithm for the optimal location of clusters in a multistorey building. The use of cluster analysis is proposed for grouping highly related activities. The vertical layout problem is formulated mathematically. Results obtained by both the algorithms are compared. Some practical problems are solved and the cost comparison made     

反渗透海水淡化技术最新研究动态

从降低海水反渗透淡化产水成本和环境友好过程的开发两个方面探讨了国内外海水反渗透淡化技术的最新研究成果和应用情况，包括能量回收器的研究、新型工艺过程的设计、海水反渗透膜的研究和应用、用膜法预处理代替传统化学器预处理以及NF—SWRO—MSF过程集成5个部分．     

基于粒子群算法的劣化桥面铺装多目标组合维护策略优化研究

发展了维护导致的间接维护成本改进模型,基于改进的桥面铺装劣化模型推导了在组合维护策略下其状态指标评估公式,建立了多目标组合维护优化模型.使用自适应粒子群优化算法,根据寿命期内维护成本现值最小化和状态指标最大化的原则,满足性能要求和预算限制约束下,优化出寿命期内成本和性能都满足要求的维护策略.以劣化水泥混凝土桥面铺装为数...     

基于代价模型的RETE优化算法

RETE匹配算法是基于规则推理系统中的经典高效算法,但是在飞行器评估这种规则和事实数量较多的系统,推理效率并不高,因为在模式匹配中,join操作的开销与事实的平方成正比。事实和规则数量较多时,产生的中间匹配信息大大增加,增加了时间复杂度和空间复杂度,严重降低了推理效率。针对飞行器评估系统的特点,本文分析了优化RETE拓扑结构是提高推理效率的关键,然后提出了基于代价模型的RETE优化算法,该算法可以自动寻找最优的RETE拓扑结构,减少了join中间结点的数据,大大降低RETE算法的时间复杂度和空间复杂度。经实验测试,基于代价模型的RETE算法在飞行器评估系统中的运行效率较高,满足飞行器评估的需求。     

Economic production order quantity and quality

The purpose of this study is to integrate a conventional production-inventory management approach and a process-quality design approach so as to promote quality and reduce costs. Because the integration of these two approaches into a single system is conducted under the influence of a deterioration process, estimated costs of production must be modified. Only then can these various costs be presented as a total cost for the present integrated system. This total cost includes: a setup cost for production reordering and process resetting, quality-related costs stemming from the loss of product quality along with a tolerance-related production process cost and a failure cost for product defects, backorder costs for production shortage, carrying costs generated by the storing and handling of inventory, and material costs for determining the process mean. The Taguchi quality loss function is introduced to assess quality loss in the system. The decision variables include the initial setting (process mean), process tolerance, and production order quantity. These variables need to be determined simultaneously to minimise the average total cost for a cycle time. An example is presented to demonstrate the proposed approach.     

基于FIS、BPNN方法的政府投资项目投资估算方法

针对没有类似工程的新建工程项目,提出了投资估算的新方法.将新建工程项目分解为n项单位工程,然后利用反向传播神经网络从大量已完工程历史数据中"提取"类似单位工程,从非线性角度实现对具有类似项目的单位工程造价的预测;对没有类似项目的单位工程,分析其工程特征,将其区分为已知工程特征和未知工程特征,并利用已知工程特征和未知工程特征之间的经验或逻辑关系,建立模糊推理系统,使未知工程特征变为已知工程特征.根据工程特征与工程造价之间的经验或逻辑关系,建立模糊推理系统,计算得到没有类似项目的单位工程造价.     

Application of Grey System Theory in Design For Cost （DFC）

Design For Cost (DFC) is a branch of Design For X (DFX). In this paper, we defined DFC as a design method that analyzed and evaluated the product‘s life cycle cost (LCC), then modified the design to reduce the LCC. Nowadays it is a very difficult thing to obtain LCC data in China or in developing countries. Statistical methods can not be used because available LCC data are few. In order to solve this problem, we used grey system theory. Then relations of cost factors were analyzed in LCC using grey relevant methods, and a GM( 1,1 ) model between design parameters and LCC was established. Using this model, we can estimate and control LCC by changing design parameters at the beginning of the design stage.     

尺寸公差一致性验证技术的研究

现有的公差语义与由CMM测得数据的公析验证计算不一致,存在“计量危机”,从而引发了各种公差数学定义理论及验证技术的研究。本以漂移理论为基础,针对不同的公差原则,开展了尺寸公差数学定义的研究,并提出相应的一致性验证的充要条件,这对促进公差验证系统发展是有益的。     

Multiphysics design optimization model for structural walls incorporating phase-change materials

The development of energy-efficient building envelopes has been an ongoing effort in many countries owing to the pressing need to achieve energy independence. In this study numerical optimization techniques and finite element analysis provide the means to find a compromise point between adding phase-change materials (PCMs) to a concrete wall, the energy savings and the wall's structural capacity. The primary objective is to minimize the overall lifetime cost of a wall by understanding the implications of PCM layer thickness, material properties and position in the wall on the overall energy consumption. While it is difficult to manually configure a typical wall for the lowest total cost, the developed computational framework provides an automated tool for searching for the best design. The results show that successful designs can be obtained where material and energy costs can be minimized through a judicious combination of existing building materials with thermal energy storage materials.