International Transactions in Operational Research最新文献

{"title":"Combining convolution neural networks with long-short term memory layers to predict Parkinson's disease progression","authors":"Maria Frasca,&nbsp;Davide La Torre,&nbsp;Gabriella Pravettoni,&nbsp;Ilaria Cutica","doi":"10.1111/itor.13469","DOIUrl":"10.1111/itor.13469","url":null,"abstract":"<p>Parkinson's disease (PD) is a neurological condition that occurs in nearly 1% of the world's population. The disease is manifested by a sharp drop in dopamine production, resulting from the death of the related producing cells in an area of the midbrain called the substantia nigra. Early diagnosis and accurate staging of the disease are essential to apply the appropriate therapeutic approaches to slow cognitive and motor decline. At present, there is not a singular blood test or biomarker accessible for diagnosing PD or monitoring the progression of its symptoms. Clinical professionals identify the disease by assessing the symptoms, which, however, may vary from case to case, as well as their progression speed. Magnetic resonance imaging (MRIs) have been used for the past three decades to diagnose and distinguish between PD and other neurological conditions.</p><p>However, to the best of our knowledge, no neural network models have been designed to identify the disease stage. This paper aims to fill this gap. Using the “Parkinson's Progression Markers Initiative” dataset, which reports the patient's MRI and an indication of the disease stage, we developed a model to identify the level of progression. The images and the associated scores were used for training and assessing different deep learning models. Our analysis distinguished four distinct disease progression levels based on a standard scale (Hoehn and Yah scale). The final architecture consists of the cascading of a 3D-CNN network, adopted to reduce and extract the spatial characteristics of the MRI for efficient training of the successive LSTM layers, aiming at modeling the temporal dependencies among the data. Before training the model, the patient's MRI is preprocessed to correct acquisition errors by applying image registration techniques, to extract irrelevant content from the image, such as nonbrain tissue (e.g., skull, neck, fat). We also adopted template-based data augmentation techniques to obtain a balanced dataset about progression classes. Our results show that the proposed 3D-CNN + LSTM model achieves state-of-the-art results by classifying the elements with 91.90 as macro averaged OVR AUC on four classes.</p>","PeriodicalId":49176,"journal":{"name":"International Transactions in Operational Research","volume":"32 4","pages":"2159-2188"},"PeriodicalIF":3.1,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140996211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Second-order cone programming models for the unitary weighted Weber problem and for the minimum sum of the squares clustering problem","authors":"Marcella Braga de Assis Linhares,&nbsp;Renan Vicente Pinto,&nbsp;Nelson Maculan,&nbsp;Marcos Negreiros","doi":"10.1111/itor.13472","DOIUrl":"10.1111/itor.13472","url":null,"abstract":"<p>In this work, new mixed integer nonlinear optimization models are proposed for two clustering problems: the unitary weighted Weber problem and the minimum sum of squares clustering. The proposed formulations are convex quadratic models with linear and second-order cone constraints that can be efficiently solved by interior point algorithms. Their continuous relaxation is convex and differentiable. The numerical experiments show the proposed models are more efficient than some classical models for these problems known in the literature.</p>","PeriodicalId":49176,"journal":{"name":"International Transactions in Operational Research","volume":"32 2","pages":"961-972"},"PeriodicalIF":3.1,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140839127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparing QUBO models for quantum annealing: integer encodings for permutation problems","authors":"Philippe Codognet","doi":"10.1111/itor.13471","DOIUrl":"10.1111/itor.13471","url":null,"abstract":"<p>QUBO (quadratic unconstrained binary optimization) has become the modeling language for quantum annealing and quantum-inspired annealing solvers. We present different approaches in QUBO for the magic square problem and the quadratic assignment problem (QAP), which can be modeled by linear equations and a permutation constraint over integer variables. Different ways of encoding integers by Booleans in QUBO amount to models, the implementation of which could have very different performance. Experiments performed on the Fixstars Amplify Annealer Engine, a quantum-inspired annealing solver, show that, compared to the classical one-hot encoding, using unary encoding for integers performs slightly better for the QAP and much better for magic square.</p>","PeriodicalId":49176,"journal":{"name":"International Transactions in Operational Research","volume":"32 1","pages":"18-37"},"PeriodicalIF":3.1,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/itor.13471","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140839124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Special Issue on “Sharing Platforms for Sustainability: Exploring Strategies, Trade-offs, and Applications”","authors":"","doi":"10.1111/itor.13455","DOIUrl":"https://doi.org/10.1111/itor.13455","url":null,"abstract":"","PeriodicalId":49176,"journal":{"name":"International Transactions in Operational Research","volume":"31 5","pages":"3557-3558"},"PeriodicalIF":3.1,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140808030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Special issue on “Managing supply chain resilience in the digital economy era”","authors":"","doi":"10.1111/itor.13464","DOIUrl":"https://doi.org/10.1111/itor.13464","url":null,"abstract":"","PeriodicalId":49176,"journal":{"name":"International Transactions in Operational Research","volume":"31 5","pages":"3555-3556"},"PeriodicalIF":3.1,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140808029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Special issue on “Multiple criteria decision making for sustainable development goals (SDGs)”","authors":"Davide La Torre,&nbsp;Hatem Masri,&nbsp;Constantin Zopounidis","doi":"10.1111/itor.13463","DOIUrl":"https://doi.org/10.1111/itor.13463","url":null,"abstract":"","PeriodicalId":49176,"journal":{"name":"International Transactions in Operational Research","volume":"31 5","pages":"3553-3554"},"PeriodicalIF":3.1,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140808028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analytical aspects of combining holistic evaluation and decomposition elicitation for preference modeling in the FITradeoff method","authors":"Jônatas Araújo de Almeida, Eduarda Asfora Frej, Lucia Reis Peixoto Roselli, Adiel Teixeira de Almeida","doi":"10.1111/itor.13470","DOIUrl":"https://doi.org/10.1111/itor.13470","url":null,"abstract":"Combining the traditional elicitation by decomposition with holistic evaluations within a decision process with multiple criteria is a peculiar aspect of the Flexible and Interactive Tradeoff (FITradeoff) method since two paradigms in preference modeling are integrated. Even though this integration leads to significant benefits to the decision process, it brings several implications that deserve a deep and detailed analysis with regard to some analytical aspects of the mathematical modeling of the method. Integrating the information obtained by these two different protocols causes significant modifications in the space of weights that may have noteworthy impacts on the results. Hence, this paper focuses its efforts on tackling and investigating such aspects of the FITradeoff method. We analyze properties and analytical aspects of FITradeoff in depth, in order to investigate how the information of holistic judgments can be inserted into the mathematical model of FITradeoff and to determine the potential implications of such integration, such as defining preference relationships and identifying potentially optimal alternatives. In addition, a new heuristic to reduce the number of questions in the elicitation by decomposition of FITradeoff is proposed. We also address situations of inconsistencies that may arise due to the conflicting information provided by decomposition and holistic judgments, as well as ways to solve such inconsistencies.","PeriodicalId":49176,"journal":{"name":"International Transactions in Operational Research","volume":"16 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140812303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improved RBM‐based feature extraction for credit risk assessment with high dimensionality","authors":"Jianxin Zhu, Xiong Wu, Lean Yu, Jun Ji","doi":"10.1111/itor.13467","DOIUrl":"https://doi.org/10.1111/itor.13467","url":null,"abstract":"To address the high‐dimensional issues in credit risk assessment, an improved multilayer restricted Boltzmann machine (RBM) based feature extraction method is proposed. In the improved multilayer RBM methodology, the reconstruction error method is first applied to ensure the number of RBM layers to construct an optimal model and then the weighted pruning approach is used to remove redundant and irrelevant traits. For verification purposes, two real‐world credit datasets are employed to demonstrate the effectiveness of the proposed multilayer RBM methodology. The experimental results reveal that a significant improvement in credit classification performance can be obtained by the improved multilayer RBM methodology. This indicates the improved multilayer RBM model proposed in this paper can be used as a promising tool to solve the high‐dimensionality issues in credit risk evaluation.","PeriodicalId":49176,"journal":{"name":"International Transactions in Operational Research","volume":"13 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A variable neighborhood search for the median location problem with interconnected facilities","authors":"I. Lozano-Osorio,&nbsp;J. Sánchez-Oro,&nbsp;A.D. López-Sánchez,&nbsp;A. Duarte","doi":"10.1111/itor.13468","DOIUrl":"10.1111/itor.13468","url":null,"abstract":"<p>The <span></span><math>\u0000 <semantics>\u0000 <mi>p</mi>\u0000 <annotation>$p$</annotation>\u0000 </semantics></math>-median problem has been widely studied in the literature. However, there are several variants that include new constraints to the classical problem that make it more realistic. In this work, we study the variant that considers interconnected facilities, that is, the distances between each pair of facilities are less than or equal to a certain threshold <span></span><math>\u0000 <semantics>\u0000 <mi>r</mi>\u0000 <annotation>$r$</annotation>\u0000 </semantics></math>. This optimization problem, usually known as the median location problem with interconnected facilities, consists of locating a set of interconnected facilities to minimize the distance between those interconnected facilities and the demand points. The large variety of real-world applications that fit into this model makes it attractive to design an algorithm able to solve the problem efficiently. To this end, a procedure based on the variable neighborhood search methodology is designed and implemented by using problem-dependent neighborhoods. Experimental results show that our proposal is able to reach most of the optimal solutions when they are known. Additionally, it outperforms previous state-of-the-art methods in those instances where the optima are unknown. These results are further confirmed by conducting nonparametrical statistical tests.</p>","PeriodicalId":49176,"journal":{"name":"International Transactions in Operational Research","volume":"32 1","pages":"69-89"},"PeriodicalIF":3.1,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/itor.13468","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140666008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Universities’ internal governance and their efficiency: empirical evidence from Russia","authors":"Tommaso Agasisti, Aleksei Egorov, Daria Platonova, Pavel Serebrennikov","doi":"10.1111/itor.13462","DOIUrl":"https://doi.org/10.1111/itor.13462","url":null,"abstract":"This paper aims to assess the relationship between governance practices and the efficiency of universities. We use the conditional efficiency approach and a partial frontier approach (order‐m estimator) for measuring universities’ efficiency and consider three important clusters of practices: centralisation, the growth of management teams at the administrative level and incentives for staff. The specific governance practices of universities are positively associated with their efficiency, the results differ for research‐oriented and teaching‐oriented universities. The optimal strategy for research‐intensive universities would be to provide a reasonable level of autonomy and optimal investment in administrative support (administrative staff salaries), while possible recommendations for teaching‐oriented universities include centralising some functions that reduce the administrative burden on the department.","PeriodicalId":49176,"journal":{"name":"International Transactions in Operational Research","volume":"1 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140623888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}