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  • 2010-2014  (1,736)
  • 2000-2004  (119)
  • 1990-1994  (617)
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  • 1
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    Single-facility huff location problems on networks (2013)
    Springer
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    Publication Date: 2013-09-17
    Description: Huff location problems have been extensively analyzed within the field of competitive continuous location. In this work, two Huff location models on networks are addressed, by considering that users go directly to the facility or they visit the facility in their way to a destination. Since the problems are multimodal, a branch and bound algorithm is proposed, in which two different bounding strategies, based on Interval Analysis and DC optimization, are used and compared. Computational results are given for the two bounding procedures, showing that problems of rather realistic size can be solved in reasonable time.
    Print ISSN: 0254-5330
    Electronic ISSN: 1572-9338
    Topics: Mathematics , Economics
    Published by Springer
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  • 2
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    Minmax due-date assignment with a time window for acceptable lead-times (2013)
    Springer
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    Publication Date: 2013-09-21
    Description: In a standard DIF due-date assignment model, customers may consider late due-dates as unacceptable, i.e., if a due-date is assigned later than a pre-specified lead time, the supplier is penalized. This note extends this setting by adding a lower bound on the acceptable lead-time, reflecting e.g., the time needed by the customer for preparation of storage space. Thus, in addition to the standard earliness/tardiness penalties of jobs, our model contains penalties for early and tardy due-dates. The objective is of a minmax type, i.e. we try to minimize the highest (job and due-date) cost. An efficient O ( n ) solution algorithm (where n is the number of jobs) is introduced.
    Print ISSN: 0254-5330
    Electronic ISSN: 1572-9338
    Topics: Mathematics , Economics
    Published by Springer
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  • 3
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    Editorial: Stochastic models of manufacturing and service system operations (2013)
    Springer
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    Publication Date: 2013-09-21
    Print ISSN: 0254-5330
    Electronic ISSN: 1572-9338
    Topics: Mathematics , Economics
    Published by Springer
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  • 4
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    Online purchaser segmentation and promotion strategy selection: evidence from Chinese E-commerce market (2013)
    Springer
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    Publication Date: 2013-09-11
    Description: Online customer segmentation is a significant research topic of customer relationship management. Previous literatures mainly studied the differences between non-purchasers and purchasers, lacking further segmentation of online purchasers. There is still existing significant heterogeneity within purchaser-groups. This paper focuses on Chinese online purchaser segmentation based on large volume of real transaction data on Taobao.com, we firstly extracted and investigated Chinese online purchaser behavior indicators and classified them into six types by cluster analysis, these six categories are: economical purchasers, active-star purchasers, direct purchasers, high-loyalty purchasers, risk-averse purchasers and credibility-first purchasers; then we built an empirical model to estimate the sensitivity of each type of online purchasers to three mainstream promotion strategies (discount, advertising and word-of-mouth), and found that economical purchasers are the most sensitive to discount promotion; direct purchasers are the most sensitive to advertising promotion; active-star purchasers are the most sensitive to word-of-mouth promotion; finally, the implications of online purchaser classification for marketing strategies were discussed.
    Print ISSN: 0254-5330
    Electronic ISSN: 1572-9338
    Topics: Mathematics , Economics
    Published by Springer
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  • 5
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    Preprocessing for a map sectorization problem by means of mathematical programming (2013)
    Springer
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    Publication Date: 2013-09-14
    Description: The sectorization problem is a particular case of partitioning problems occurring in cartography. The aim is to partition a territory into sectors such that the statistical activity measure of each sector is as close as possible to a given target value. We model this as a problem of minimizing the maximum deviation among all the sectors between their activity measure and their target value. We propose a mathematical programming formulation for the problem, we add some valid inequalities to restrict the solution space and develop a preprocessing procedure to reduce the number of variables. Computational results on different maps highlight the strong efficiency of this reduction procedure.
    Print ISSN: 0254-5330
    Electronic ISSN: 1572-9338
    Topics: Mathematics , Economics
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  • 6
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    Heuristics for integrated optimization of catheter positioning and dwell time distribution in prostate HDR brachytherapy (2013)
    Springer
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    Publication Date: 2013-09-18
    Description: High dose-rate (HDR) brachytherapy is one kind of radiotherapy used to treat different forms of cancer, such as prostate cancer. When this treatment is used for prostate cancer, a radioactive source is moved through catheters implanted into the prostate. For each patient, a treatment plan is constructed. This plan determines for example catheter positions and dwell time distribution, that is, where to the radioactive source should stop and for how long. Mathematical optimization methods have been used to find dwell time distributions of high quality; however few optimization approaches that concern catheter positioning have been studied. In this article we present an integrated model that optimizes catheter positioning and dwell time distribution simultaneously. Our results show that integrating the catheter positioning yields a large reduction of the dwell time distribution objective value (15–94 %) and slight improvements in clinical quality measures. Since the presented model is computationally demanding to solve, we also present three heuristics: a tabu search, a variable neighbourhood search and a genetic algorithm. Of these, variable neighbourhood search is the best, and out-performs a state-of-the-art optimization software (CPLEX) and the two other heuristics.
    Print ISSN: 0254-5330
    Electronic ISSN: 1572-9338
    Topics: Mathematics , Economics
    Published by Springer
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  • 7
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    A multi-stage method for content classification and opinion mining on weblog comments (2013)
    Springer
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    Publication Date: 2013-09-18
    Description: In this paper, we illustrate how to combine supervised machine learning algorithms and unsupervised learning techniques for sentiment analysis and opinion mining purposes. To this end, we describe a multi-stage method for the automatic detection of different opinion trends. The proposal has been tested on real textual data available from comments introduced in a weblog, connected to organizational and administrative affairs in a public educational institution. The use of the described tool, given its potential impact to obtain valuable knowledge from opinion streams created by commenters, may be straightforwardly extended, for example, to the detection of opinion trends concerning policy decision making or electoral campaigns.
    Print ISSN: 0254-5330
    Electronic ISSN: 1572-9338
    Topics: Mathematics , Economics
    Published by Springer
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  • 8
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    Assortment and inventory decisions with multiple quality levels (2013)
    Springer
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    Publication Date: 2013-09-18
    Description: We consider the assortment and inventory decisions of a retailer under a locational consumer choice model where products can be differentiated both horizontally (e.g., color of a product) and vertically (e.g., quality of a product). The assortment and quantity decisions affect customer choice and, hence, the demand and sales for each product. In this paper, we investigate two different environments where product availability and assortment affect consumer choice and demand in different ways: make-to-order (MTO) and make-to-stock (MTS). In the MTO environment, customers order and purchase their most preferred product; that is, stockouts do not occur. In the MTS model, customers buy their most preferred product if it is in stock or do not buy if it is out of stock. In both environments we find conditions under which it is optimal to carry assortments of only a single quality level. In the MTS case, we show that an assortment of mixed quality levels can be optimal only within a narrow range of parameters.
    Print ISSN: 0254-5330
    Electronic ISSN: 1572-9338
    Topics: Mathematics , Economics
    Published by Springer
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  • 9
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    More results on column sufficiency property in Euclidean Jordan algebras (2013)
    Springer
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    Publication Date: 2013-09-21
    Description: A matrix M ∈ R n × n is said to be a column sufficient matrix if the solution set of LCP( M , q ) is convex for every q ∈ R n . In a recent article, Qin et al. (Optim. Lett. 3:265–276, 2009 ) studied the concept of column sufficiency property in Euclidean Jordan algebras. In this paper, we make a further study of this concept and prove numerous results relating column sufficiency with the Z and Lypaunov-like properties. We also study this property for some special linear transformations.
    Print ISSN: 0254-5330
    Electronic ISSN: 1572-9338
    Topics: Mathematics , Economics
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  • 10
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    Measuring greenhouse gas emissions for the transportation sector in Korea (2013)
    Springer
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    Publication Date: 2013-09-21
    Description: This paper presents a methodology of measuring greenhouse gas emissions (mainly CO 2 ) for the transportation sector and illustratively applies it in Korea. The transportation sector is one of the most critical sectors concerning environmental pollution and represents about 20 percent of the yearly total greenhouse gas emissions for the energy sector in Korea. In spite of the increasing importance of the transportation sector in the eco-environment, current methodologies to analyze greenhouse gas emissions use a Tier 1 method, which is the simplest type among the methodologies recommended by IPCC guidelines. For a new methodology, we consider characteristics of transportation modes and operational environments in Korea. The proposed methodology can analyze the amount of greenhouse gas emissions for each transport mode and integrate it through transportation environments. It also provides a decision-making tool for governments to make transportation polices. As a result, the Korean government can manage the transportation sector in an eco-friendly manner and improve the national eco-environment.
    Print ISSN: 0254-5330
    Electronic ISSN: 1572-9338
    Topics: Mathematics , Economics
    Published by Springer
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