درخت حوزه‌های تخصصی

The purpose of this study is to compare the impacts of momentum on stock returns of companies listed in Tehran Stock Exchange in different market conditions. For this purpose, the sample size is 120 months from 2008 to 2017. The research hypotheses are estimated using multivariate linear regression using time series method. Based on the results of the hypotheses test, the momentum in each of the market conditions, including normal, ascending and descending conditions, has a positive and direct effect on the stock returns of the companies listed in Tehran Stock Exchange, which indicates the principle of investors' insatiability in the stock exchange Tehran seeking to maximize its return on investment with a certain risk that in a downside mode of market, their insatiability exits less and faster than their momentum conditions, which is a reason for investors' loss evasion in this situation.

According to the matter of knowledge-based businesses development in economic development and job creation of the state, it is so important to identify effective strategies and factors in developing entrepreneurship, supporting commercializing and branding of knowledge-based businesses and the environment in which these businesses fare formed. The purpose of the present research is offering an entrepreneurial branding model to knowledge-based firms. This is a qualitative research with the grounded theory approach. In this research, 20 experts of marketing, branding fields and managing directors of knowledge-based firms were studied through semi structured interviews by using purposive sampling method. Interviews were continued up to reach theoretical saturation point and after analyzing extracted codes in triple coding stages, 165 primary conceptual propositions were identified from open coding, 5 categorical propositions from axial coding and 23 main factors from selective coding and then the final model were extracted. In paradigm model of grounded theory, the pivotal phenomenon of the research has been considered the entrepreneurial branding process in the knowledge-based firms of the state and the casual, demographic and intervening conditions of this phenomenon were identified after fulfilling research stages. It was also offered the results and consequences of branding in these types of institutes in the model.

The present research identifies and prioritizes the effective organizational structure components using content (theme) analysis and Delphi technique and hierarchical analysis (Case Study of Regional Electric Companies of Iran). The present study is applied  based on purpose and is exploratory-survey based on the nature and method of data collection. The statistical population of this study includes 36 experts selected from Iranian regional electricity companies. They were identified through targeted sampling. To analyze the research data, statistical software MAXQDA2012, SPSS and EXPERT CHOICE were used. Using these statistical software, in order to test research questions, Kendall test have been investigated. In the qualitative phase, we analyzed and interpreted (coding) of concepts expressed by the experts of the regional electricity companies of Iran, including open, axial and selective coding. The Delphi method was then used to localize and screen the indices obtained. In the content (theme) analysis phase, 20 factors were identified and after gathering the experts 'responses in Delphi periods, the members' concordance was assessed through SPSS software and by calculating the Kendall's coefficient of concordance for the questionnaires, and the investigation and concordance among the experts was obtained 81.9%. The results showed that 15 components were agreed upon by the experts. In the final step, the components were prioritized using the hierarchical analysis approach. The results of the hierarchical analysis showed that among the criteria, the complexity criterion was of the highest importance. The next priorities from the experts' point of view are the inhibitor or developer factors and the technology criterion.