Research Paper
Scheduling
Saeideh Naderi; Mohsen Vaez-Ghasemi; farzad movahedi sobhani
Abstract
The Resource-Constrained Project Scheduling Problem (RCPSP) is a general one in scheduling which possesses various applications in production, production scheduling, project managing and other criteria. This issue has been studied since 1960 and is very complicated. In this study, the common presuppositions ...
Read More
The Resource-Constrained Project Scheduling Problem (RCPSP) is a general one in scheduling which possesses various applications in production, production scheduling, project managing and other criteria. This issue has been studied since 1960 and is very complicated. In this study, the common presuppositions and limitations regarding such problems will be investigated in addition to their reliability in modelization in order to investigate the possibility of availability of renewable resources using a new attitude. The objective of modelization of RCPSP is quantification of total costs and minimization of delays in projects. Therefore, in order to mathematically modelize RCPSP, non-linear complex integer math programming which transforms into a linear programming model using the features of exponential functions is used. In order to solve the final linear math problem, some experimental examples will be designed in different dimensions, so that the performance and efficiency of the designed model are studied. For solving problems with low dimensions , the Epsilon Constraint multi-objective optimization method is used in an exact optimization software like Lingo. In order to find out the solutions of the ones whose dimensions are high, which exact methods can not solve,the meta-heuristic algorithm called NSGA-II which is a strong one to optimize multi objective problems is used. The results of using these algorithms and the statistical analysis which shows their reliability as 95 percent , indicates that the performance is suitable for genetic algorithms. Therefore this meta-heuristic algorithm has more efficiency and more apposite performance for the recommended model compared with the software of exact optimization. Using the designed math model ,this study can result in decreasing the times of delay in projects and the costs in the scheduling problem and also increasing the reliability when activities are multi-mode.
Research Paper
Supply chain management
davod Andalib Ardakani; Mehrdad Kiani; Ali saffari darberazi; Fatemeh Zamzam; Elham Mofatehzadeh
Abstract
The purpose of this study was to design a model for identifying and ranking the factors influencing green supply chain management in the tile and ceramic industry, which is a significant industry in Iran. The study consisted of three main stages.In the first stage, a systematic review of the literature ...
Read More
The purpose of this study was to design a model for identifying and ranking the factors influencing green supply chain management in the tile and ceramic industry, which is a significant industry in Iran. The study consisted of three main stages.In the first stage, a systematic review of the literature and the Meta-synthesis method were employed to identify and categorize the factors that contribute to the success of green supply chain management. In the second stage, The factors were thoroughly examined and refined through the content validity method. As a result of these steps, a comprehensive model was developed, comprising 30 factors categorized into six dimensions: green suppliers, green technology and expertise, green human resources, green products, Green Organization and Communications, and Green regulations and Support. In the third stage, the Interval Type-2 Fuzzy Analytic Hierarchy Process (IT2FS-AHP) method was utilized to rank the dimensions and factors. Experts' opinions were gathered through a questionnaire to determine the importance of each dimension and factor. The results indicated that the dimensions of green technology and expertise, as well as Green regulations and Support, were deemed the most critical. Furthermore, factors such as "Attention to social responsibility in the organization," "Design and development of evaluation and selection systems of suppliers based on environmental criteria," and "support of operational, middle, and senior managers in implementing the green supply chain" were identified as highly influential in the success of green supply chain management. Overall, the identification and ranking of key factors in green supply chain management contribute to mitigating the adverse environmental impact of industrial activities and enhancing customer satisfaction.
Research Paper
Clustering
Mehdi Ajalli
Abstract
Classification is one of the important tasks in any work and field. Cluster analysis (CA) is one of the most important classification methods. CA is one of the widely used methods in many scientific fields. Clustering is one of the most popular data mining techniques with many applications in industry. ...
Read More
Classification is one of the important tasks in any work and field. Cluster analysis (CA) is one of the most important classification methods. CA is one of the widely used methods in many scientific fields. Clustering is one of the most popular data mining techniques with many applications in industry. Especially, in the field of human resources management, the use of predefined rules is used to determine the performance and division of employees. The main goal of the current research is to design a suitable model for allocating rewards to employees by using the combined approach of the Group Analytical Hierarchy Process (GAHP) and CA. The research method is practical in terms of purpose and descriptive-survey in terms of data collection. For this purpose, first, by designing and distributing a comparative questionnaire of indicators and completing them by the experts of Shahid Fakuri Industries' component manufacturing unit, and by using the group hierarchical analysis process model with Expert Choice software, the weight of the effective indicators in employee evaluation was calculated, then the values of the indicators for 29 employees with using the formula of the normalization function in the Excel software, it is standardized and the weight of the indicators is multiplied by the standard values of the data, and then the distance matrix and the optimal number of clusters are calculated through the Machaon software, and finally, using the discriminative clustering approach and using the K-means method, data clustering was done with SPSS and Makaon software and a suitable model was presented for allocating rewards to the workers of the parts making unit.
Research Paper
Case studies in industry and services
Saeed Rasouli Pareh Yousefian; Jaffar Barghi Mogaddam; Hamid Janani; Mohammad Rahim Najafzadeh; Afshin Roshan Milani
Abstract
In this paper, the prioritization and weighting of different methods of using renewable energy, as well as the feasibility of using renewable energy in the management of sports venues in the water and electricity industry of east Azerbaijan province, have been discussed. The D-number theory method has ...
Read More
In this paper, the prioritization and weighting of different methods of using renewable energy, as well as the feasibility of using renewable energy in the management of sports venues in the water and electricity industry of east Azerbaijan province, have been discussed. The D-number theory method has been used to prioritize different methods of using renewable energy. The results of gathering information from experts in this field, show that using solar energy with a weight of 0.5345 is the best method for producing electrical energy in sports and welfare venues. Also, the use of wind energy with a weight of 0.5183 and the use of water energy with a weight of 0.5126 are in the next ranks, respectively. The indicators used in ranking factors include total costs, energy efficiency and compatibility with environmental conditions. Based on the results of the feasibility study and the available findings, it can be seen that the total cost of using renewable energy in the sports and welfare venues of East Azerbaijan Province is equal to 10093.4 million Rials. Also, the interest return rate of the investment is equal to 19.43%. Therefore, using solar energy as a source of electricity production has technical and economic justification.
Research Paper
Supply chain management
Razieh keshavarzfard; Azam Naderi
Abstract
Approaches to the Vehicle Routing Problem (VRP) have been considered as a practical solution against increasing transportation costs in businesses. In fact, we seek to develop new methods to reduce shipping costs and at the same time maximize profits. Transportation of hazardous materials(HazMat), as ...
Read More
Approaches to the Vehicle Routing Problem (VRP) have been considered as a practical solution against increasing transportation costs in businesses. In fact, we seek to develop new methods to reduce shipping costs and at the same time maximize profits. Transportation of hazardous materials(HazMat), as one of the most complex types of transportation, has always been studied and investigated by researchers. Designers of hazardous materials logistics networks should always design the routes between the hazardous materials’ production center and each of their collection centers, while considering the restrictions related to time windows and uncertainties related to them. In addition, they should take into account vehicle capacity and mileage capacity in sub-tours to minimize total transition and pollution costs. In this research a mathematical model is presented for vehicle routing of hazardous materials, simultaneously from three perspectives (economic, sensitivity of the route and the factors which cause uncertainty in the collection and delivery of hazardous materials). Afterwards, the hybrid Genetic and Simulated Annealing algorithm is applied as an optimization method to solve the problem. Finally, several numerical examples, as well as sensitivity analysis are provided to show the efficiency of the model. The results show as the route sensitivity coefficient increases, the objective function increases. The effect of demand on the objective function is generally upward, but in some cases it is downward.
