In previous studies, the design of the vendor managed Inventory (VMI) models was based on minimizing the total cost of the supply chain. In this paper, a new approach for designing VMI models with the aim of optimizing the Inventory turnover of the producer warehouse is developed. Based on the proposed model, our objectives are to maximize Inventory turnover along with the constraint of lack of shortage of goods in the production lines and also compliance with the minimum and maximum constraints of Inventory in the warehouse of the producer which can be simpler and more practical than minimizing the total cost of the supply chain. A hybrid algorithm based on a genetic algorithm (GA) using particle swarm optimization (PSO) is proposed in order to gain both proper global and local search abilities in the solution space for solving the new model. As a case study, implementation of the proposed model in the supply chain of Saipa Company improved the Inventory turnover, decreased Inventory level and decreased the level of replenishment by suppliers.

Improving participation in voluntary activities in Iran is important because increasing productivity among young people, given the country's young population, contributes to community sustainability. Therefore, a better understanding of volunteer motivation in Iranian youth is needed. The Volunteer Functions Inventory (VFI) for assessing volunteer motivations has good psychometric properties and is adapted to several languages, but no validated Iranian translation yet exists. The purpose of this study was to investigate the psychometric Characteristics of voluntary functions Inventory in members of Iranian Red Crescent Society. Sample size was 595 members of Youth Organization of Iranian Red Crescent Society from 31 provinces and 175 cities of Iran that were selected by multi-stage cluster sampling method and responded to voluntary functions Inventory. Data were collected using a demographic sample and voluntary functions Inventory (VFI). Confirmatory factor analysis using principal components method was used for data analysis. The results of the present study showed that the voluntary functions Inventory had validity and reliability. Also, the factor structure showed that 29 items and 6 factors well assess people's attitudes to volunteering, and the structure of this Inventory was well-fitted and confirmed all goodness of fit models. The present study provides the use of the Iranian translation of the Voluntary Functions Inventory (6 scales and 29 items) to assess volunteer motivation among young Iranian volunteers.

The purpose of this study was to investigate the relationship between customer focus and return on assets and turnover ratio of listed companies in Tehran Stock Exchange. The purpose of this study is applied and is descriptive-correlational. The population of the study consisted of listed companies in Tehran Stock Exchange who were active from 2014 to 2016. The sample size was 118 companies in total and 472 companies-year in the time range collected by systematic removal of screening technique. Research data were determined. The tools used in this study are reports published by the Stock Exchange, Exchange Monthly, and Modern Access Software, Desert & Dena and auditing reports, financial statements and the online community of Certified Public Accountants. Pearson's correlation, Pearson correlation and linear regression were analyzed. The results showed that there is a positive significant relationship between customer focus and return on assets at 95% confidence level and also a positive and significant relationship between customer focus and Inventory turnover ratio. Finally, both hypotheses were confirmed.

The Big Five Inventory (BFI) is one of the most widely used personality questionnaires, but very few studies have been conducted on its psychometric properties in Iranian population. This study was carried out with the aim of studying the psychometric properties of the BFI questionnaire. For this purpose, 390 university students in Tehran (210 girls and 180 boys) with an age range of 18 to 56 years (M = 27.52; SD = 8.79) were selected using the convenience sampling method and completed BFI and NEO-FFI questionnaires. Cronbach's alpha, multitrait-multimethod matrix, and confirmatory factor analysis were used to estimate the psychometric properties of the questionnaire. The result of the confirmatory factor analysis showed that 15 of the 44 items did not have a strong factor loading (higher than 0.40) on the corresponding factors and were therefore removed from the questionnaire. The fit indices showed that the Persian version of 29 questions (BFI-29) with 5 factors has a good fit with the data. The reliability analysis also showed that the range of Cronbach's alpha coefficients of the factors is from 0.70 to 0.79. The lowest Cronbach's alpha coefficient was related to agreeableness factor and the highest was related to conscientiousness. The findings from the multitrait-multimethod matrix showed that the BFI-29 questionnaire has good convergent and divergent validity with the NEO-FFI questionnaire. In general, based on the results of the present study, it can be said that the BFI-29 questionnaire has desirable psychometric properties and whenever a short tool for personality measurement is needed, this questionnaire can be used.

Tax is taken into consideration as one of the important factors which playsrole in economic prosperity and societies' development through gaining revenue for governments. Iran's economy has been in inflationary recession condition for years but legal authorities don't pay attention to alter expense figures appeared in Companies financial statements, Whereas, revenue figures recognized carry inflation effect. Therefore, this situation imposes more tax burden on Companies especially ones Utilizing more various forms of long term assets in their Assets structure. This study investigates the relationship between tax policy and Companies tax burden in inflationary conditions. Inventory and PPE level are used to measure tax Policy effects as independent variables. The ratio of tax expense to CFO is applied as a measure for tax burden. The data of Companies listed on TSE during 2002 to 2017 in regard to some consideration, are analyzed using GLS method (Unbalanced Panel). Results show that in Inflationary conditions, tax burden is increased when Companies acquire more PPE and inventories in the past years. In addition, lower Inventory turnover strengths the inflation effect on Inventory which cause higher tax for Companies.

Purpose: The Effect of working capital management on the firm's profitability in the companies listed on the Tehran stock exchange. Methodology: The sample of the study consisted of 125 companies that have between 2014 to 2019 were studied. In this study, the variable "net income before deducting interest and taxes to total assets" as a measure of the profitability of the variables, the period of collection of receivables, Inventory turnover period as capital management criteria in circulation in variables, firm size, sales growth, the ratio of current assets to current liabilities ratio of financial debt to total assets and operating profit were used as the control variable. Findings: The result of this study showed that there is a significant inverse relationship between the profitability of companies with receivables collection period and between the profitability of companies with Inventory turnover period significant relationship was not found. In other words, managers can reduce the period with the debt collection company to stay within reasonable limits and increase profitability. Originality/Value: it is expected that companies by used proper management of working capital take steps to increase the value of the company and thus increase the wealth of its shareholders.

To improve port function, logistic activity usage and providing this region in port hinterlands is very important. To provide this center and increase facilities from added value service, there can be a competition for his fact. Logistic parks which are placed in port hinterlands play an important role as a link to attract local and global centers with added value to support port economic development. On this paper, consideration has been taken on effectiveness zones of port logistic center and quantitative function for logistic center on each zone. This process is based on two scenarios: existence and not existence of logistic center in a port. This center has an obvious influence on the circumference, traffic and port service, and can make infrastructures to improve the service. Because of new distribution and public economy, influence of this system on transportation division can be sensible. The function of this center on economic logistic zone can be predicted and evaluated by direct and indirect influence, cost consideration and profits on service level. To provide enough potential to improve traffic level and facility development, logistic center can be a good reason. The system efficiency in road traffic decrease and local transportation and cost decrease in order to invert logistic is emphasized. This paper shows that existence of logistic center can increase port efficiency and income and decrease transportation chain costs.