Recently added articles from Omega:
Essential properties of good OR/MS professionals.(operations research and management science)(Editorial)
Feb 01, 2009; ... Operations Research is concerned with scientifically deciding how to best design and operate man-machine systems, usually under conditions requiring the allocation of scarce resources. [1, p. 1] Russ Ackoff [2, p. 3] suggested a list of "essential properties of good management", ...
Coordinated deterministic dynamic demand lot-sizing problem: a review of models and algorithms.(Formula)(Table)
Feb 01, 2009; ... <Pre> Contents 1. Introduction 2. Overview of lot-sizing problems and paper scope2.1. Deterministic static demand models2.2. Deterministic dynamic demand models 3. Coordinated uncapacitated lot-sizing problem (CULSP)3.1. Problem formulations 3.1.1 ....
Policies for knowledge refreshing in databases.(Formula)(Technical report)(Statistical table)
Feb 01, 2009; ... 1. Introduction With the wide application of information technology in organizations, especially the rapid growth of E-Business, organizations have been accumulating vast amount of data on customers, sourcing partners, competitors, and business processes. Knowledge discovery in ...
Optimal price, warranty length and production rate for free replacement policy in the static demand market.
Feb 01, 2009; ... 1. Introduction For the same class of products in the market, lower price usually tends to enhance sales volume, but leads to a decrease in the unit profit. Pricing must be based on cost to create profit; meanwhile, the price of a product should not be too high to dissuade ...
Centralized resource allocation BCC models.
Feb 01, 2009; ... 1. Introduction The centralized resource allocation BCC model (CRA-BCC) is a Data envelopment analysis (DEA)-type model that has recently been introduced by Lozano and Villa [1] and Lozano et al. [2]. With the standard radial BCC, or variable returns to scale, DEA model [3] as ...
Multi-horizon Markowitz portfolio performance appraisals: a general approach.
Feb 01, 2009; ... I. Introduction For decades, portfolio performance has been evaluated using performance measures combining information on both return and risk, such as the Sharpe measure [1], the Treynor measure [2], the Jensen measure [3], among others (see [4] for a critical discussion). ...
Increasing offensive or defensive efficiency? An analysis of Italian and Spanish football.
Feb 01, 2009; ... 1. Introduction The clubs forming the Spanish professional football league officially showed income and expenditure of more than 1200 million [euro] for the last seasons. If the direct economic impact of the league on the Spanish economy is added to the indirect impact, then the ...
Two ways to handle dependent uncertainties in multi-criteria decision problems.
Feb 01, 2009; ... 1. Introduction We consider multi-criteria group decision-making problems, where the decision makers (DMs) want to identify their most preferred alternative(s) based on uncertain or inaccurate criteria measurements. In many real-life problems, the uncertainties of the criteria ...
The loss-averse newsvendor problem.
Feb 01, 2009; ... 1. Introduction The newsvendor problem is one of the fundamental models in stochastic inventory theory [1]. The newsvendor's objective is to choose an optimal order quantity to balance his cost (or disutility) of ordering too many against his cost (or disutility) of ordering too ...
Analysis of a two-echelon inventory system with returns.
Feb 01, 2009; ... 1. Introduction Product take-back after use for disposal or recovery is recently receiving growing attention for several reasons. First of all, government legislations in many developed countries hold organizations responsible for handling their products and packaging after ...
Quantifying costs of forecast errors: a case study of the warehouse environment.
Feb 01, 2009; ... 1. Introduction Forecast accuracy is of particular importance to service organizations due to the lack of buffering mechanisms typically seen in manufacturing [1]. One such type of organization is warehouses that serve as primary links between producers and customers in the ...
A hybrid genetic algorithm/mathematical programming approach to the multi-family flowshop scheduling problem with lot streaming.
Feb 01, 2009; ... 1. Introduction The n-job, m-machine flowshop problem can be stated simply as determining the best sequence in which to process each of n jobs, all of which must be processed on m machines in order. However, the number of variations of this problem is enormous. To begin with, ...
A visual interactive approach to classical and mixed vehicle routing problems with backhauls.
Feb 01, 2009; ... 1. Introduction Transportation is generally considered as being a significant factor of economic activities in any company. The problems of appropriate usage of the vehicle fleet appear as a matter of restricted resources of the company and expectations of customers and they are ...
Efficient composite heuristics for total flowtime minimization in permutation flow shops.
Feb 01, 2009; ... I. Introduction Flow shop scheduling is an important manufacturing system widely existing in industrial environments. A flow shop can be described as n jobs being processed on m machines and each job having the same machine order [1]. There are many kinds of flow shops, such as ...
The dynamic plant layout problem: incorporating rolling horizons and forecast uncertainty.
Feb 01, 2009; ... 1. Introduction In the past two decades many researchers have investigated the dynamic plant layout problem (DPLP). The DPLP involves the design of facility layouts based on a multi-period planning horizon. During this horizon, the material handling flows between pairs of ...
Inter-city bus scheduling under variable market share and uncertain market demands.
Feb 01, 2009; ... 1. Introduction Bus scheduling is a critical activity in inter-city bus operations and is essential to a carrier's profitability, its level of service and its competitiveness in the market. There has already been some research devoted to intercity bus scheduling problems; for ...
Problem structuring methods as intervention tools: reflections from their use with multi-organisational teams.(Applications)
Feb 01, 2009; ... 1. Introduction Problem structuring methods (PSMs) are a family of 'soft' operational research methods aimed at assisting groups in tackling a complex problem area of common interest [1]. PSMs handle such problematic situations through group modelling and facilitation, with a ...
A multicriteria blockmodel for performance assessment.(Applications)
Feb 01, 2009; ... I. Introduction Organisations continually try to improve their performance. This may often be helped by emulation: by finding similar but better performing organisations and learning from them. This process was given considerable methodological impetus by the introduction of ...
Assessment of supplier performance based on product-development strategy by applying multi-granularity linguistic term sets.(Applications)(Formula)(Report)
Feb 01, 2009; ... 1. Introduction Today, the competitive advantage of a focal company heavily relies upon the performance of his suppliers. The effectiveness of selecting, coordinating, communicating and evaluating procedures of suppliers becomes an important factor in achieving business goals ....
Improving routing and scheduling decisions at a distributor of industrial gasses.(Applications)
Feb 01, 2009; ... 1. Introduction and company background In recent years, several suppliers have taken on the responsibility of managing inventories of their own products at customer sites. These vendor managed inventory (VMI) environments have several documented benefits on supply chain ...