Operational Research

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Why do we examine calendar anomalies only in financial markets? Month effect evidence from the Greek banking industry
Operational Research - Tập 17 - Trang 99-114 - 2015
Vasileiou Evangelos
Calendar anomalies (CAs) have been puzzling financial economists and practitioners for decades. The existence of CAs violates one of the most significant financial theories: the efficient market hypothesis (Fama in J Finance 25:383–417, 1970). Up to date most financial economists have examined the existence of CAs only in capital markets. However, as most scholars suggest, an economy’s financial s...... hiện toàn bộ
Flowshop simulator using different sampling methods
Operational Research - Tập 5 - Trang 261-272 - 2005
M. Tari, A. Dahmani
Descriptive sampling is based on a deterministic selection of the input sample values and their random permutation. Descriptive sampling refined is concerned with a block of descriptive samples of prime size. The latter reduces the sampling bias introduced by descriptive sampling and eliminates the problem of descriptive sampling related to the sample size. This paper compares the performance meas...... hiện toàn bộ
An efficient bi-objective algorithm to solve re-entrant hybrid flow shop scheduling with learning effect and setup times
Operational Research - Tập 18 Số 1 - Trang 123-158 - 2018
Seyed Mohammad Mousavi, Iraj Mahdavi, Javad Rezaeian, M. Zandieh
Cơ chế phân bổ người tị nạn: lý thuyết và ứng dụng cho Liên minh châu Âu Dịch bởi AI
Operational Research - Tập 22 - Trang 4557-4584 - 2022
Petros Xepapadeas, Ioannis Mourtos
Chúng tôi nghiên cứu một vấn đề di dời liên quan đến việc phân bổ một số lượng người tị nạn nhất định—những người có sự khác biệt về quốc gia xuất xứ và các đặc điểm như giới tính, độ tuổi hoặc trình độ học vấn—từ Hy Lạp sang các quốc gia khác trong Liên minh châu Âu, những quốc gia đã cam kết tiếp nhận một số lượng người tị nạn nhất định. Để nghiên cứu vấn đề này, chúng tôi đã phát triển một khun...... hiện toàn bộ
#phân bổ người tị nạn #phương pháp phân bổ #Liên minh châu Âu #di dời #sở thích người tị nạn
Contracting mechanism with imperfect information in a two-level supply chain
Operational Research - Tập 20 - Trang 349-368 - 2017
Asif Muzaffar, Shiming Deng, Muhammad Nasir Malik
This article investigates a two-level supply chain consisting of a single manufacturer and a retailer. The retailer’s ordering patterns are highly influenced by his risk preferences. We discuss ordering policies when the manufacturer has limited demand information and propose a production-commitment contract, which mitigates double marginalization under imperfect information. Demand distribution i...... hiện toàn bộ
On the optimal solution of budgeted influence maximization problem in social networks
Operational Research - Tập 19 - Trang 817-831 - 2017
Evren Güney
The budgeted influence maximization problem is a challenging stochastic optimization problem defined on social networks. In this problem, the objective is identifying influential individuals who can influence the maximum number of members within a limited budget. In this work an integer program that approximates the original problem is developed and solved by a sample average approximation (SAA) s...... hiện toàn bộ
Using multiobjective optimization models to establish healthy diets in Spain following Mediterranean standards
Operational Research - Tập 21 - Trang 1927-1961 - 2019
Mónica Hernández, Trinidad Gómez, Laura Delgado-Antequera, Rafael Caballero
Last reviews show how the Spanish consumption patterns have become away from the Mediterranean diet, traditionally consumed in Spain and widely supported by the nutritional expert community. Hence, the aim of this study is to explore and provide different alternatives to the current Spanish diet. The idea is to obtain a set of palatable diets fulfilling the nutritional requirements and conform the...... hiện toàn bộ
Scheduling efficiency on correlated parallel machine scheduling problems
Operational Research - - 2018
Yang-Kuei Lin
A model for introducing telemedicine to the Greek National Health Care System
Operational Research - - 2003
Prodromos Mavridis
A robust behavioral portfolio selection: model with investor attitudes and biases
Operational Research - Tập 20 - Trang 427-446 - 2017
Omid Momen, Akbar Esfahanipour, Abbas Seifi
This study develops a behavioral portfolio selection model that uses a robust estimator for expected returns in order to produce portfolios with less need to change over consecutive periods. We also consider investor attitudes toward risk through spectral risk measure as well as investor expectations on future returns by means of the Black–Litterman model, and finally, our model includes a varying...... hiện toàn bộ
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