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Internet digital content pricing and subscribers control 互联网数字内容定价与订户控制
Operations Research and Decisions Pub Date : 2023-01-01 DOI: 10.37190/ord230304
Sobhi Mejjouali, Lotfi Tadj
{"title":"Internet digital content pricing and subscribers control","authors":"Sobhi Mejjouali, Lotfi Tadj","doi":"10.37190/ord230304","DOIUrl":"https://doi.org/10.37190/ord230304","url":null,"abstract":"We use optimal control theory to determine the optimal rate of change in the subscription fee and the optimal ratio of ad space to the total web page space for a web content provider. An optimal solution is obtained using the maximum principle approach and the model predictive control approach. Numerical experiments show that it is preferable to use the first approach when the planning horizon is short and the second approach when the planning horizon is long","PeriodicalId":43244,"journal":{"name":"Operations Research and Decisions","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135599653","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: 0
Characterisation of some generalized continuous distributions by doubly truncated moments 一些广义连续分布的双截断矩表征
IF 0.4
Operations Research and Decisions Pub Date : 2023-01-01 DOI: 10.37190/ord230101
Haseeb Athar, M. Ahsanullah, Mohd. Almech Ali
{"title":"Characterisation of some generalized continuous distributions by doubly truncated moments","authors":"Haseeb Athar, M. Ahsanullah, Mohd. Almech Ali","doi":"10.37190/ord230101","DOIUrl":"https://doi.org/10.37190/ord230101","url":null,"abstract":"The characterisation of probability distribution plays an important role in statistical studies. There are various methods of characterisation available in the literature. The characterisation using truncated moments limits the observations; hence, researchers may save time and cost. In this paper, the characterisation of three general forms of continuous distributions based on doubly truncated moments has been studied. The results are given simply and explicitly. Further, the results have been applied to some well-known continuous distributions.","PeriodicalId":43244,"journal":{"name":"Operations Research and Decisions","volume":"688 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76280112","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: 0
An integrated modelling approach for an optimal location of warehouses in the defence industry organisation 国防工业组织中仓库最佳位置的集成建模方法
IF 0.4
Operations Research and Decisions Pub Date : 2023-01-01 DOI: 10.37190/ord230203
Melda Gelibolu Bayrakcı, Ö. Baykoç
{"title":"An integrated modelling approach for an optimal location of warehouses in the defence industry organisation","authors":"Melda Gelibolu Bayrakcı, Ö. Baykoç","doi":"10.37190/ord230203","DOIUrl":"https://doi.org/10.37190/ord230203","url":null,"abstract":"Countries’ defence industries are the leading indicator of their global power. The warehouse is the place where the materials are kept until the customer order arrives so that the companies are viable and can respond appropriately to internal/external customer demands. In this regard, warehouse location plays a vital role in the defence industry in terms of storage options with increased flexibility, a simplified supply chain with cost management and optimal positioning according to deployment locations. In this study, the decision on the location of warehouses for logistic support during the warranty period of military vehicles manufactured and supplied to the armed forces by a defence company was made. It is aimed to propose the best solution to a real-life problem with high complexity, containing many data and constraints. In this context, the criteria that are thought to be most relevant to this problem have been determined by taking expert opinions. Having determined the order of importance of the requirements by the analytical hierarchy process (AHP) with the Super Decisions V 2.10, their weights were included as a coefficient of the objective function in the goal programming (GP) model. As a result of solving the GP model using GAMS (general algebraic modelling system), it was decided to select the warehouses that provided the optimal results among the alternative warehouse locations in 9 different locations. Furthermore, to see the impact of changes in criterion weights, sensitivity analysis has also been included. The significance of this research lies within the integrated usage of AHP and GP in the defence industry when determining warehouse locations by the experts’ opinions. With this study, not only a solution strategy was developed, but also a basis for the warehouse location decision in the defence industry projects already signed or to be signed was given.","PeriodicalId":43244,"journal":{"name":"Operations Research and Decisions","volume":"89 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82142871","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: 0
Gold rush optimizer: A new population-based metaheuristic algorithm 淘金热优化器:一种新的基于人口的元启发式算法
IF 0.4
Operations Research and Decisions Pub Date : 2023-01-01 DOI: 10.37190/ord230108
Kamran Zolfi
{"title":"Gold rush optimizer: A new population-based metaheuristic algorithm","authors":"Kamran Zolfi","doi":"10.37190/ord230108","DOIUrl":"https://doi.org/10.37190/ord230108","url":null,"abstract":"Today’s world is characterised by competitive environments, optimal resource utilization, and cost reduction, which has resulted in an increasing role for metaheuristic algorithms in solving complex modern problems. As a result, this paper introduces the gold rush optimizer (GRO), a population-based metaheuristic algorithm that simulates how gold-seekers prospected for gold during the Gold Rush Era using three key concepts of gold prospecting: migration, collaboration, and panning. The GRO algorithm is compared to twelve well-known metaheuristic algorithms on 29 benchmark test cases to assess the proposed approach’s performance. For scientific evaluation, the Friedman and Wilcoxon signed-rank tests are used. In addition to these test cases, the GRO algorithm is evaluated using three real-world engineering problems. The results indicated that the proposed algorithm was more capable than other algorithms in proposing qualitative and competitive solutions.","PeriodicalId":43244,"journal":{"name":"Operations Research and Decisions","volume":"42 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91281367","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
An empirical analysis of Malaysian palm oil export to world major palm oil importing countries: evidence from a panel cointegration model 马来西亚棕榈油出口到世界主要棕榈油进口国的实证分析:来自面板协整模型的证据
IF 0.4
Operations Research and Decisions Pub Date : 2023-01-01 DOI: 10.37190/ord230105
Nur Ain Mohd Hassan, K. Zakaria, Kamalrudin Mohamed Salleh, Siti Mashani Ahmad
{"title":"An empirical analysis of Malaysian palm oil export to world major palm oil importing countries: evidence from a panel cointegration model","authors":"Nur Ain Mohd Hassan, K. Zakaria, Kamalrudin Mohamed Salleh, Siti Mashani Ahmad","doi":"10.37190/ord230105","DOIUrl":"https://doi.org/10.37190/ord230105","url":null,"abstract":"The paper explores the long-term causal relationships of Malaysian palm oil exports with the real effective exchange rate of the respective importing countries, palm oil consumption, vegetable oil production, and GDP growth. The study applied panel cointegration and causality approaches based on data from 10 main palm oil importing countries between 2004 and 2018. The impacts of economic growth, the effective real exchange rate, and the production of other vegetable oils by the main palm oil importing countries on Malaysian palm oil exports were found to be negative. However, palm oil consumption by the main palm oil importers was found to be a statistically significant positive determinant of Malaysian palm oil exports. This finding indicates that consumption has a direct positive effect on the demand for exports. A panel Granger causality analysis revealed a unidirectional causality between importing countries’ production of other vegetable oils and Malaysian exports of palm oil.","PeriodicalId":43244,"journal":{"name":"Operations Research and Decisions","volume":"43 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78561042","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: 0
Combining predictive distributions of electricity prices. Does minimizing the CRPS lead to optimal decisions in day-ahead bidding? 结合电价的预测分布。在日前投标中，最小化CRPS是否会导致最优决策?
Operations Research and Decisions Pub Date : 2023-01-01 DOI: 10.37190/ord230307
Weronika Nitka, Rafał Weron
{"title":"Combining predictive distributions of electricity prices. Does minimizing the CRPS lead to optimal decisions in day-ahead bidding?","authors":"Weronika Nitka, Rafał Weron","doi":"10.37190/ord230307","DOIUrl":"https://doi.org/10.37190/ord230307","url":null,"abstract":"Probabilistic price forecasting has recently gained attention in power trading because decisions based on such predictions can yield significantly higher profits than those made with point forecasts alone. At the same time, methods are being developed to combine predictive distributions, since no model is perfect and averaging generally improves forecasting performance. In this article, we address the question of whether using CRPS learning, a novel weighting technique minimizing the continuous ranked probability score (CRPS), leads to optimal decisions in day-ahead bidding. To this end, we conduct an empirical study using hourly day-ahead electricity prices from the German EPEX market. We find that increasing the diversity of an ensemble can have a positive impact on accuracy. At the same time, the higher computational cost of using CRPS learning compared to an equal-weighted aggregation of distributions is not offset by higher profits, despite significantly more accurate predictions.","PeriodicalId":43244,"journal":{"name":"Operations Research and Decisions","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135599318","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: 0
Pricing-inventory model with discrete demand and delivery orders 需求和交货订单离散的定价-库存模型
Operations Research and Decisions Pub Date : 2023-01-01 DOI: 10.37190/ord230308
Heibatolah Sadeghi, Hêriş Golpîra, Faicel Hnaien, Cosimo Magazzino
{"title":"Pricing-inventory model with discrete demand and delivery orders","authors":"Heibatolah Sadeghi, Hêriş Golpîra, Faicel Hnaien, Cosimo Magazzino","doi":"10.37190/ord230308","DOIUrl":"https://doi.org/10.37190/ord230308","url":null,"abstract":"This paper aims to develop an inventory model considering discrete demand, coordinated pricing, and multiple delivery policy in a single-buyer single-supplier production-inventory system. The shortage is not allowed and the planning horizon is considered to be infinite. The main objective of the framework is to equip the decision-maker with optimal order, pricing, and shipment quantities to maximize the total profit of the system. The results obtained from the numerical example reveal that the proposed approach with an average selling price equal to about 94% of the classical model, has resulted in an average profit increase of about 16% and an average order increase of about 34% compared to the classical approach","PeriodicalId":43244,"journal":{"name":"Operations Research and Decisions","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135599347","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: 0
Teaching assistant selection in Thailand by using an extended VIKOR based on piecewise linear approximation of fuzzy numbers 基于模糊数分段线性逼近的扩展VIKOR在泰国的助教选择
Operations Research and Decisions Pub Date : 2023-01-01 DOI: 10.37190/ord230306
Akan Narabin, Phairoj Samutrak
{"title":"Teaching assistant selection in Thailand by using an extended VIKOR based on piecewise linear approximation of fuzzy numbers","authors":"Akan Narabin, Phairoj Samutrak","doi":"10.37190/ord230306","DOIUrl":"https://doi.org/10.37190/ord230306","url":null,"abstract":"Because of the COVID-19 situation, selection for a teaching assistant position to get a TA scholarship in a university in Thailand needs to be performed online by the formed committee. Due to the online process and the limited number of scholarships offered by the university, beyond the face-to-face interview, multiple-criteria decision analysis can help to select a proper student. In this study, we use the extended VIKOR method with fuzzy numbers to help committees to select the students from the applicants. The criteria and the weights of the criteria are provided with the help of committees. Both trapezoidal and triangular linguistic variables are used to find the solution and to observe the range of the possible result. The different weights supporting the strategy of maximum group utility are varied to detect the potential alternatives. The ranking results are also compared with the one obtained from the TODIM approach to illustrate the appropriate alternative.","PeriodicalId":43244,"journal":{"name":"Operations Research and Decisions","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135599930","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: 0
Linear programming models for optimal workload and batching in pick-and-pass warehousing systems 拣传仓储系统中最优工作量和批处理的线性规划模型
Operations Research and Decisions Pub Date : 2023-01-01 DOI: 10.37190/ord230309
Grzegorz Tarczyński
{"title":"Linear programming models for optimal workload and batching in pick-and-pass warehousing systems","authors":"Grzegorz Tarczyński","doi":"10.37190/ord230309","DOIUrl":"https://doi.org/10.37190/ord230309","url":null,"abstract":"Pick-and-pass systems are a part of picker-to-parts order-picking systems and constitute a very common storage solution in cases where customer orders are usually small and need to be completed very quickly. As workers pick items in the zones connected by conveyor, their work needs to be coordinated. The paper presents MILP models that optimize the order-picking process. The first model uses information about expected demand for items to solve the storage location problem and balance the workload across zones. The task of the next model is order-batching and sequencing – two concepts are presented that meet different assumptions. The results of the exemplary tasks solved with the use of the proposed MILP models show that the total picking time of a set of orders can be reduced by about 35-45% in comparison with random policies. The paper presents an equation for the lower bound of a makespan. Recommendations about the number of zones that guarantee the required system efficiency are also introduced.","PeriodicalId":43244,"journal":{"name":"Operations Research and Decisions","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135599348","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: 0
The SEKO assignment. Efficient and fair assignment of students to multiple seminars SEKO任务。有效和公平地分配学生参加多个研讨会
Operations Research and Decisions Pub Date : 2023-01-01 DOI: 10.37190/ord230301
Tobias Hoßfeld _
{"title":"The SEKO assignment. Efficient and fair assignment of students to multiple seminars","authors":"Tobias Hoßfeld _","doi":"10.37190/ord230301","DOIUrl":"https://doi.org/10.37190/ord230301","url":null,"abstract":"Seminars are offered to students for education in various disciplines. The seminars may be limited in terms of the maximum number of participants, e.g., to have lively interactions. Due to capacity limitations, those seminars are often offered several times to serve the students’ demands. Still, some seminars are more popular than others and it may not be possible to grant access to all interested students due to capacity limitations. In this paper, a simple, but efficient random selection using key objectives (SEKO) assignment strategy is proposed which achieves the following goals: (i) efficiency by utilizing all available seminar places, (ii) satisfying all students by trying to assign at least one seminar to each student, and (iii) fairness by considering the number of assigned seminars per student. We formulate various theoretical optimization models using integer linear programming (ILP) and compare their solutions to the SEKO assignment based on a real-world data set. The real-world data set is also used as the basis for generating large data sets to investigate the scalability in terms of demand and number of seminars. Furthermore, the first-in first-out (FIFO) assignment, as a typical implementation of fair assignments in practice, is compared to SEKO in terms of utilization and fairness. The results show that the FIFO assignment suffers in real world situations regarding fairness, while the SEKO assignment is close to the optimum and scales regarding computational time in contrast to the ILP.","PeriodicalId":43244,"journal":{"name":"Operations Research and Decisions","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135599932","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: 0
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