Strategic and Tactical Crude Oil Supply Chain: Mathematical Programming Models

Crude oil industry very fast became a strategic industry. Then, optimization of the Crude Oil Supply Chain (COSC) models has created new challenges. This fact motivated me to study the COSC mathematical programming models. We start with a systematic literature review to identify promising avenues. Afterwards, we elaborate three concert models to fill identified gaps in the COSC context, which are (i) joint venture formation, (ii) integrated upstream, and (iii) environmentally conscious design

Z-Numbers-Based Approach to Hotel Service Quality Assessment

In this study, we are analyzing the possibility of using Z-numbers for measuring the service quality and decision-making for quality improvement in the hotel industry. Techniques used for these purposes are based on consumer evalu- ations - expectations and perceptions. As a rule, these evaluations are expressed in crisp numbers (Likert scale) or fuzzy estimates. However, descriptions of the respondent opinions based on crisp or fuzzy numbers formalism not in all cases are relevant. The existing methods do not take into account the degree of con- fidence of respondents in their assessments. A fuzzy approach better describes the uncertainties associated with human perceptions and expectations. Linguis- tic values are more acceptable than crisp numbers. To consider the subjective natures of both service quality estimates and confidence degree in them, the two- component Z-numbers Z = (A, B) were used. Z-numbers express more adequately the opinion of consumers. The proposed and computationally efficient approach (Z-SERVQUAL, Z-IPA) allows to determine the quality of services and iden- tify the factors that required improvement and the areas for further development. The suggested method was applied to evaluate the service quality in small and medium-sized hotels in Turkey and Azerbaijan, illustrated by the example

Model of Customer Knowledge Level of Moslem Women and Its Impact on Hijab Purchase Decisions in Surabaya Indonesia

The purpose of this study is to prevent further misunderstanding regarding hijab for Moslems in Surabaya, understanding the correct knowledge of hijab will affect hijab manufacturers to produce hijab in accordance with Islamic Shari’a. This research is causal conclusive type with quantitative approach, since it aims to test specific relations. Analytical technique used in this research is logistic regression analysis to reveal the strength of prediction on knowledge level towards hijab purchasing decision. The results that the level of customer knowledge in hijab purchase is still at the level of know-how, which is not yet at the know-why level. Customer’s buying decision of hijab is based on the quality and color of the fabric, then whether the brand is famous or not. Afterwards, customer generally gains more knowledge regarding hijab and prefer hijab that is complying Islamic Shari'a. Keywords Hijab, Moslem Women, Level of Customer Knowledge, Hijab Purchase Decisions

Mathematical Methods and Operation Research in Logistics, Project Planning, and Scheduling

In the last decade, the Industrial Revolution 4.0 brought flexible supply chains and flexible design projects to the forefront. Nevertheless, the recent pandemic, the accompanying economic problems, and the resulting supply problems have further increased the role of logistics and supply chains. Therefore, planning and scheduling procedures that can respond flexibly to changed circumstances have become more valuable both in logistics and projects. There are already several competing criteria of project and logistic process planning and scheduling that need to be reconciled. At the same time, the COVID-19 pandemic has shown that even more emphasis needs to be placed on taking potential risks into account. Flexibility and resilience are emphasized in all decision-making processes, including the scheduling of logistic processes, activities, and projects

Handbook of Mathematical Geosciences

This Open Access handbook published at the IAMG's 50th anniversary, presents a compilation of invited path-breaking research contributions by award-winning geoscientists who have been instrumental in shaping the IAMG. It contains 45 chapters that are categorized broadly into five parts (i) theory, (ii) general applications, (iii) exploration and resource estimation, (iv) reviews, and (v) reminiscences covering related topics like mathematical geosciences, mathematical morphology, geostatistics, fractals and multifractals, spatial statistics, multipoint geostatistics, compositional data analysis, informatics, geocomputation, numerical methods, and chaos theory in the geosciences

Análise da produção científica sobre o papel do escritório de projetos na gestão do conhecimento período de 2004 a 2014

Orientador : Prof. Dr. José Simão de Paula PintoDissertação (mestrado) - Universidade Federal do Paraná, Setor de Ciências Sociais Aplicadas, Programa de Pós-Graduação em Ciência, Gestão e Tecnologia da Informação. Defesa: Curitiba, 27/02/2015Inclui referênciasResumo: Analisa a produção científica referente ao período de 2004 a 2014, de artigos publicados em periódicos científicos indexados por bases indexadoras, sobre gestão do conhecimento e gestão de projetos, programas e portfólio (Grupo I) e sobre gestão do conhecimento em projetos, programas e portfólio e o escritório de gestão de projetos, programas e portfólio (Grupo II). Foi utilizado método informétrico baseado na lei de Zipf (frequência das palavras), Luhn (posicionamento das palavras de maior conteúdo semântico) e Goffman (determinação do ponto de transição) para identificar os termos que melhor descrevem o conteúdo dos dois grupos de artigos. Para caracterizar a produção científica, foram utilizados métodos bibliométricos baseado nas leis de Lotka (produtividade de autores) e Bradford (produtividade de periódicos), e cientométrico (países e instituições com maior produção e citações), com a utilização do software HistCite para as análises bibliométricas. O experimento informétrico baseado na lei de Zipf para o Grupo I identificou 237 palavras-chave as quais apresentaram 79% de compatibilidade quando comparadas às palavras-chave fornecidas pelos autores. O experimento informétrico baseado na lei de Zipf para o Grupo II identificou 8 palavras-chave as quais apresentaram 63% de compatibilidade comparadas às palavras chave fornecidas pelos autores. Para o Grupo I foram identificados 41 autores com 3 ou mais contribuições no período e para o Grupo II foi identificado 1 autor com 3 contribuições no período. Palavras-chave: Informetria. Bibliometria. Cientometria. Gestão do conhecimento. Gestão de projetos. Gestão de programas de projetos. Gestão de portfólio de projetos. Escritório de gerenciamento de projetos.Abstract: This research analyzes the scientific production of papers published in scientific journals from 2004 to 2014 and indexed by , on knowledge management and project, program and portfolio management, (referred as Group I) and on knowledge management, project, program and portfolio management, and project management office (referred as Group II). The informetric method used was based on Zipf's law (words frequency), Luhn (position of the words with higher semantic content) and Goffman (transition point) to identify terms that better describe the contents of the two groups of articles. Bibliometric methods were used in order to characterize the scientific production, were used bibliometric methods based on the laws of Lotka (author productivity) and Bradford (journal's productivity), and scientometric (countries and institutions with higher production and quotes), using the HistCite software. The Group I papers informetric experiment, based on Zipf's law, has identified 237 keywords which showed 79% compatibility compared to the keywords provided by the authors. The Group II informetric experiment, based on Zipf's law, identified 8 keywords which showed 63% compatibility compared to the keywords provided by the authors. For Group I there are 41 authors identified with 3 or more contributions in the period and the Group II was identified one author with three contributions in the period. Key-words: Informetrics. Bibliometrics. Scientometrics. Knowledge management. Project management. Project program management. Project portfolio management. Project management office