درخت حوزه‌های تخصصی

<strong>Abstract</strong> The motivation of this paper is the way in which the alternative fuel modes for public transport are analyzed. The aim is proposing a hybrid method to select the best fuel for public transport. The buses with old and new alternative fuels are considered in this paper. Several types of fuels are considered as alternative-fuel modes, e.g., conventional diesel, ultra-low-sulfur diesel fuel, bio-diesel fuel, and electric and gasoline hybrid engine. Moreover, many decision criteria categorized into performance, environmental, economical, infrastructure, technological, social, and risk are taken into consideration. The paper uses a hybrid multi-criteria decision analysis model to rank the fuel modes and/or choose the most efficient one. This hybrid method consists of rank order centroid method to assign the weights to the criteria, and additive ratio assessment technique to analyze the decision-making matrix. To demonstrate the applicability and flexibility of the model, a case study with data given by the experts from the respected fields is employed. The result presents that the liquefied propane gas (LPG) outperforms the other options in terms of the selected criteria.   <strong> </strong>

Since a major part of Iran petrochemical base products has been considered for export, it is essential and inevitable to consider international markets so as to examine the economic conditions of petrochemical development projects. The aim of the current work is to offer appropriate solutions to the facing challenges and to the development of innovation management model in the petrochemical companies producing polyethylene products and approaching new polyethylene goods. Data collection was conducted using the library and field studies; after taking these steps, 58 main indicators were considered by experts’ through screening among 130 extracted indices. Based on these indicators, a final questionnaire was designed by Likert scale and distributed. Finally, after receiving the comments of 105 managers and experts in 5 different petrochemical companies producing polyethylene on these indicators, the data were collected, and the research model was fitted using a structural equation and Smart PLS software. After fitting, 29 indices, 2 factors, and 6 dimensions were accepted for designing the model. The general dimension was composed of economic, organizational, regulatory, and supervision factors, while the specific dimension was formed of technological, technical, marketing, and systemic factors. According to the research conducted for successful innovation management, considering all the above-mentioned points is necessary in petrochemical companies producing polyethylene products. <strong><em> </em></strong>

The purpose of the current work, conducted in 2017 and 2018, is to identify andprioritize the qualitative and quantitative factors affecting human resources(HR) valuation at National Iranian Oil Company and its subsidiaries. Using asnowball sampling method, 28 experts were selected from the head of humanresources, the head of finance, and some staff members of National IranianOil Company and its subsidiaries. In order to identify the dimensions andcomponents affecting human resources valuation, a comprehensive literaturereview at international and national levels, interviews with experts, andthree stages of distribution and collection of questionnaires using the FuzzyDelphi method were performed. Then, two phases of the paired comparisonquestionnaire were developed and provided for the experts to explain andevaluate the cause-and-effect relationships between the dimensions andthe components together. The specified components and dimensions wereprioritized using the Fuzzy DEMATEL method. Using the Fuzzy Delphimethod, 15 dimensions and 101 components influencing HR valuation wereidentified at National Iranian Oil Company and its affiliated companies.According to Pareto 20-80, 20 components were identified as the factorsinfluencing human resources valuation at National Iranian Oil Company andits subsidiaries, and using the Fuzzy DEMATEL method, 15 dimensionsand 20 specified components were prioritized. According to the resultsobtained, the most important dimension and component affecting humanresources valuation at National Iranian Oil Company and its subsidiaries arejob satisfaction, motivation, and perseverance in employees’ assignments.