نشریه مدیریت نوآوری و راهبردهای عملیاتی
پیاپی 4 (زمستان 1399)

In the real world, because of decreasing the related cost, the vehicles should return to the depot after serving the last customer’s location. This paper investigates the problem of the increasing service time by using the stochastic time for each tour such that the total traveling time of the vehicles is limited to a specific limit based on a defined probability.

It is proven that classic models in vehicle routing problems (VRPs) belong to the class of NP-hard ones; thus, due to its complexity using exact methods in large-scale problems, a meta-heuristic based differential evolution (DE) algorithm.

The obtained results indicate the efficiency of the proposed DE algorithm.

Originality/Value:

The total travel time is limited to a definite probability percent, and also other constraints (e.g., capacity and time distribution restrictions) are considered while the total cost of the transportation is minimized.

The main objective of this paper is to rank the executive actions of the technology roadmaps with emphasis on resources and technology acquisition.

In order to achieve this goal, firstly, literature on the role of technology, including approaches, frameworks of roadmap drawing, technology uses, and a number of technology maps that are mostly up-to-date, were reviewed. In the next step, to rank the executive actions, two technology roadmaps published by the International Energy Agency were selected. These two roadmaps are produced in 2011, with the horizon of 2050. These two roadmaps were studied and the infrastructure needed to achieve their goals was extracted. Eventually, the battery was selected as the main challenge in the resource layer and technology acquisition for ranking.

By this way, five batteries from the family of ion-lithium batteries (with six technical characteristics) were ranked by TOPSIS and PROMETHEE and for the sake of clarity, the six common electric cars on the world market have been compared and ranked.

Originality/Value:

The results of this research can be used to increase global competitiveness, used by domestic car manufacturers, as well as a guideline to determine the priorities of the executive actions need to be undertaken by Iranian firms.

The aim of this study was to develop and select a strategy for interacting with stakeholders during the project life cycle in oil projects using SWOT matrix in Excel, fuzzy tops method and a proposed mathematical model in Pars Oil and Gas Company.

For this purpose, 9 strengths, 8 weaknesses, 7 threats and 8 opportunities were presented by Swat Processing Matrix and then 15 proposed strategies using the views of a sample of 23 people available from experts in the studied projects. Then, the ranking of strategies was performed by fuzzy topsis method in Excel, and in the last step, the proposed mathematical model was solved in Gamz software and the strategy of interaction with stakeholders was determined.

Findings showed that the numerical value of internal factors was 0.124 and the numerical value of external factors was 0.003. Therefore, the strategic position of the company was in the first area and it is necessary to put aggressive strategies on the agenda of this company. Also, the ranking of strategies was done using fuzzy topsis method and the findings of solving the mathematical model to select the optimal strategy of interaction with stakeholders showed that the results of the mathematical model are different from the result of multi-criteria decision making and each strategy can relate to several conflicts Improve stakeholders.

Originality/Value:

This article adds scientific value by providing a way to identify, prioritize and determine appropriate strategies for interacting with stakeholders.

In this study, in order to measure the efficiency and productivity of companies in the cement industry of the Tehran Stock Exchange, the gray data envelopment analysis approach and the Malmquist productivity index have been used.

 For this purpose, in the first step, we identify the appropriate financial ratios for measuring efficiency, then we calculate these ratios for each financial year in the form of gray numbers (intervals). In the next step, these ratios are divided into two groups of input variables and output variables under the title of research variables. Finally, the efficiency and productivity of the studied companies for the two fiscal years 2018 and 2019 by CCR and BCC models. Its components have been estimated.

The results of this study provide a suitable framework for using uncertain information (gray) to replace definite information and thus allow more realistic results to be estimated about the performance of companies.

Originality/Value:

This study uses the Malmquist Gray Productivity Index to provide a framework for comparing productivity changes over time. This index measures the ratio of the measured efficiencies of a production unit in two different time periods.

One of the most important issues in supplying equipment and managing spare parts for power plant industries is evaluating and selecting suppliers and assigning orders to them. The aim of this study is to achieve a comprehensive model for ranking the suppliers, classification the parts, evaluation of suppliers and optimal allocation of orders.

For this purpose, in the first stage, the indicators of supplier's evaluation were determined and weight of evaluation indicators calculated by taking opinions of experts and using Group AHP and Minimum squares techniques. Prioritization and grouping of parts were done by sampling the Kraljic matrix and the priority factor of each part was determined. In the second stage, by using the Topsis technique, the rank of each supplier in terms of supplying the potential parts was determined. In the third stage, the design of a mathematical model of planning the correct number zero-one was considered. The function of the target is to maximize the value of the purchase, and include the restrictions of zero-one planning, limited budget, and management policies. GAMS software was used to solve the model.

The results show that determining the group for each part, considering the two dimensions of supply risk and the vitality of the part, provides a suitable management tool for equipment supply management and using the zero and one integer planning model, a suitable method for order allocation problems. It is in the field of spare parts and the structure and components of the objective function and constraints can be changed according to the type of organization.

Originality/Value:

The TOPSIS technique properly combines the weight of evaluation indicators and expert opinions about the suppliers of each component, and the results can be used with confidence in the design of the mathematical model.

The aim of this study was to design a new fuzzy expert system for project portfolio risk management in ongoing projects of a first mobile holding.

To do this; To identify the risks from the Dematel method developed in Excel, to evaluate and determine the most important risks from the fuzzy FMEA methods in Excel and the AHP method in Expert Choice software; And to select the optimal risk response, a proposed mathematical model is used and solved in Gamz software.

The research findings showed that there are 23 risks in the studied projects, 8 of which were of high importance and impact. Also, risk prioritization and determination of their impact level was performed using the integrated AHP-FMEA method. Findings obtained from solving and implementing the mathematical model in Gamz software also showed that the proposed model of efficiency and capability for selecting optimal risk response strategies is established.

Originality/Value:

The general findings indicate that the proposed new fuzzy expert system also has the necessary capability and efficiency to manage the portfolio risk in the study holding.

The integrated coastal zone management (ICZM) was considered the main way of solving environmental problems. In addition, there are many countries in the world that attempt in providing the human needs to coastal region services in order to the natural border of these zones. The main purpose of this paper is to identify the current situation of pollution in different coastal areas of Mazandaran province and the zoning of areas in terms of environmental pollution.

In this paper, we first deal with the conceptual framework of ICZM and study the successful examples of its implementation in different countries and compare them from different aspects. Then, in order to implement this project on the west coast of Mazandaran province, we will pay attention to the studies related to environmental pollution.

Findings show that in coastal management, all physical, ecological, social, and economic processes that interact on the coast and the sea should be identified and a certain coordinate between different users at local, national, regional, and international levels must be created. Furthermore, the successful implementation of ICZM requires more attention to the social and economic conditions of the Caspian littoral states.

Originality/Value:

In this article, we study the characteristics of the west coast of Mazandaran province based on important ecosystems and parameters such as industrial pollutants, soil type, vegetation (sea and land), wildlife, geology, marine topics (water fluctuations, wave characteristics, etc.) And we analyze the related issues. Finally, in order to implement the ICZM in the west coast of Mazandaran province, from the point of view of environmental pollution, we investigate the distribution of industrial pollutants in the use of coastal lands up to a radius of three kilometers in the Caspian Sea.