IIE Transactions最新文献_第2页

Estimating Primary Demand for a Heterogeneous-Groups Product Category under Hierarchical Consumer Choice Model 层次消费者选择模型下异质群体产品类别的初级需求估计

IIE Transactions Pub Date : 2016-06-02 DOI: 10.1080/0740817X.2015.1078524

Haengju Lee, Y. Eun

{"title":"Estimating Primary Demand for a Heterogeneous-Groups Product Category under Hierarchical Consumer Choice Model","authors":"Haengju Lee, Y. Eun","doi":"10.1080/0740817X.2015.1078524","DOIUrl":"https://doi.org/10.1080/0740817X.2015.1078524","url":null,"abstract":"Abstract This paper discusses the estimation of primary demand (i.e., the true demand before the stockout-based substitution effect occurs) for a heterogeneous-groups product category that is sold in the department store setting, based on historical sales data, product availability, and market share information. For such products, a hierarchical consumer choice model can better represent purchasing behavior. This means that choice occurs on multiple levels: A consumer might choose a particular product group on the first level and purchase a product within that chosen group on the second level. Hence, in the present study, we used the nested multinomial logit (NMNL) choice model for the hierarchical choice and combined it with non-homogeneous Poisson arrivals over multiple periods. The expectation-maximization (EM) algorithm was applied to estimate the primary demand while treating the observed sales data as an incomplete observation of that demand. We considered the estimation problem as an optimization problem in terms of the inter-product-group heterogeneity, and this approach relieves the revenue management system of the computational burden of using a nonlinear optimization package. We subsequently tested the procedure with simulated data sets. The results confirmed that our algorithm estimates the demand parameters effectively for data sets with a high level of inter-product-group heterogeneity.","PeriodicalId":13379,"journal":{"name":"IIE Transactions","volume":"48 1","pages":"541 - 554"},"PeriodicalIF":0.0,"publicationDate":"2016-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0740817X.2015.1078524","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59752092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Reliability estimation of a system subject to condition monitoring with two dependent failure modes 具有两种相关失效模式的状态监测系统的可靠性估计

IIE Transactions Pub Date : 2016-05-26 DOI: 10.1080/0740817X.2016.1189632

A. Khaleghei, V. Makis

{"title":"Reliability estimation of a system subject to condition monitoring with two dependent failure modes","authors":"A. Khaleghei, V. Makis","doi":"10.1080/0740817X.2016.1189632","DOIUrl":"https://doi.org/10.1080/0740817X.2016.1189632","url":null,"abstract":"ABSTRACT A new competing risk model is proposed to calculate the Conditional Mean Residual Life (CMRL) and Conditional Reliability Function (CRF) of a system subject to two dependent failure modes, namely, degradation failure and catastrophic failure. The degradation process can be represented by a three-state continuous-time stochastic process having a healthy state, a warning state, and a failure state. The system is subject to condition monitoring at regular sampling times that provides partial information about the system is working state and only the failure state is observable. To model the dependency between two failure modes, it is assumed that the joint distribution of the time to catastrophic failure and sojourn time in the healthy state follow Marshal–Olkin bivariate exponential distributions. The Expectation–Maximization algorithm is developed to estimate the model's parameters and the explicit formulas for the CRF and CMRL are derived in terms of the posterior probability that the system is in the warning state. A comparison with a previously published model is provided to illustrate the effectiveness of the proposed model using real data.","PeriodicalId":13379,"journal":{"name":"IIE Transactions","volume":"48 1","pages":"1058 - 1071"},"PeriodicalIF":0.0,"publicationDate":"2016-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0740817X.2016.1189632","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59755470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 27

A novel strategy for redundant components in reliability--redundancy allocation problems 可靠性冗余组件的一种新策略——冗余分配问题

IIE Transactions Pub Date : 2016-05-26 DOI: 10.1080/0740817X.2016.1189631

Mostafa Abouei Ardakan, M. Sima, Ali Zeinal Hamadani, D. Coit

{"title":"A novel strategy for redundant components in reliability--redundancy allocation problems","authors":"Mostafa Abouei Ardakan, M. Sima, Ali Zeinal Hamadani, D. Coit","doi":"10.1080/0740817X.2016.1189631","DOIUrl":"https://doi.org/10.1080/0740817X.2016.1189631","url":null,"abstract":"ABSTRACT This article presents a new interpretation and formulation of the Reliability–Redundancy Allocation Problem (RRAP) and demonstrates that solutions to this new problem provide distinct advantages compared with traditional approaches. Using redundant components is a common method to increase the reliability of a system. In order to add the redundant components to a system or a subsystem, there are two traditional types of strategies called active and standby redundancy. Recently a new redundancy strategy, called the “mixed” strategy, has been introduced. It has been proved that in the Redundancy Allocation Problem (RAP), this new strategy has a better performance compared with active and standby strategies alone. In this article, the recently introduced mixed strategy is implemented in the RRAP, which is more complicated than the RAP, and the results of using the mixed strategy are compared with the active and standby strategies. To analyze the performance of the new approach, some benchmark problems on the RRAP are selected and the mixed strategy is used to optimize the system reliability in these situations. Finally, the reliability of benchmark problems with the mixed strategy is compared with the best results of the systems when active or standby strategies are considered. The final results show that the mixed strategy results in an improvement in the reliability of all the benchmark problems and the new strategy outperforms the active and standby strategies in RRAP.","PeriodicalId":13379,"journal":{"name":"IIE Transactions","volume":"48 1","pages":"1043 - 1057"},"PeriodicalIF":0.0,"publicationDate":"2016-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0740817X.2016.1189631","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59755255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 69

The value of demand forecast updates in managing component procurement for assembly systems 需求预测更新在装配系统部件采购管理中的价值

IIE Transactions Pub Date : 2016-05-26 DOI: 10.1080/0740817X.2016.1189630

James Cao, K. C. So

引用次数: 3

Production planning with price-dependent supply capacity 供应能力与价格相关的生产计划

IIE Transactions Pub Date : 2016-05-21 DOI: 10.1080/0740817X.2016.1189628

Z. M. Teksan, J. Geunes

引用次数: 2

Integrated storage space allocation and ship scheduling problem in bulk cargo terminals 散货码头综合存储空间分配与船舶调度问题

IIE Transactions Pub Date : 2016-05-03 DOI: 10.1080/0740817X.2015.1063791

Lixin Tang, Defeng Sun, Jiyin Liu

{"title":"Integrated storage space allocation and ship scheduling problem in bulk cargo terminals","authors":"Lixin Tang, Defeng Sun, Jiyin Liu","doi":"10.1080/0740817X.2015.1063791","DOIUrl":"https://doi.org/10.1080/0740817X.2015.1063791","url":null,"abstract":"ABSTRACT This study is motivated by the practices of large iron and steel companies that have steady and heavy demands for bulk raw materials, such as iron ore, coal, limestone, etc. These materials are usually transported to a bulk cargo terminal by ships (or to a station by trains). Once unloaded, they are moved to and stored in a bulk material stockyard, waiting for retrieval for use in production. Efficient storage space allocation and ship scheduling are critical to achieving high space utilization, low material loss, and low transportation costs. In this article, we study the integrated storage space allocation and ship scheduling problem in the bulk cargo terminal. Our problem is different from other associated problems due to the special way that the materials are transported and stored. A novel mixed-integer programming model is developed and then solved using a Benders decomposition algorithm, which is enhanced by the use of various valid inequalities, combinatorial Benders cuts, variable reduction tests, and an iterative heuristic procedure. Computational results indicate that the proposed solution method is much more efficient than the standard solution software CPLEX.","PeriodicalId":13379,"journal":{"name":"IIE Transactions","volume":"48 1","pages":"428 - 439"},"PeriodicalIF":0.0,"publicationDate":"2016-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0740817X.2015.1063791","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59751450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

The effect of buffers and work sharing on makespan improvement of small batches in assembly lines under learning effects 学习效应下缓冲和工作分担对装配线小批量完工时间改进的影响

IIE Transactions Pub Date : 2016-05-03 DOI: 10.1080/0740817X.2015.1056392

Y. Bukchin, E. Wexler

{"title":"The effect of buffers and work sharing on makespan improvement of small batches in assembly lines under learning effects","authors":"Y. Bukchin, E. Wexler","doi":"10.1080/0740817X.2015.1056392","DOIUrl":"https://doi.org/10.1080/0740817X.2015.1056392","url":null,"abstract":"Abstract The effect of workers’ learning curves on the production rate in manual assembly lines is significant when producing relatively small batches of different products. This research studies this effect and suggests applying a work-sharing mechanism among the workers to improve the makespan (time to complete the batch). The proposed mechanism suggests that adjacent cross-trained workers will help each other in order to reduce idle times caused by blockage and starvation. The effect of work sharing and buffers on the makespan is studied and compared with a baseline situation, where the line does not contain any buffers and work sharing is not applied. Several linear programming and mixed-integer linear programming formulations for makespan minimization are presented. These formulations provide optimal work allocations to stations and optimal parameters of the work-sharing mechanism. A numerical study is conducted to examine the effect of buffers and work sharing on the makespan reduction in different environment settings. Numerical results are given along with some recommendations regarding the system design and operation.","PeriodicalId":13379,"journal":{"name":"IIE Transactions","volume":"48 1","pages":"403 - 414"},"PeriodicalIF":0.0,"publicationDate":"2016-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0740817X.2015.1056392","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59750909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

A false discovery approach for scanning spatial disease clusters with arbitrary shapes 一种用于扫描任意形状空间疾病簇的错误发现方法

IIE Transactions Pub Date : 2016-04-25 DOI: 10.1080/0740817X.2015.1133940

Yanting Li, L. Shu, F. Tsung

引用次数: 1

Lévy-driven non-Gaussian Ornstein–Uhlenbeck processes for degradation-based reliability analysis 基于退化的可靠性分析的l<s:1>驱动非高斯Ornstein-Uhlenbeck过程

IIE Transactions Pub Date : 2016-04-13 DOI: 10.1080/0740817X.2016.1172743

Y. Shu, Q. Feng, E. P. Kao, Hao Liu

引用次数: 18

A new budget allocation framework for selecting top simulated designs 一种新的顶级仿真设计选择预算分配框架

IIE Transactions Pub Date : 2016-04-06 DOI: 10.1080/0740817X.2016.1156788

Siyang Gao, Weiwei Chen

引用次数: 33