Showing 12 results for Sarlak
Volume 12, Issue 4 (3-2013)
Abstract
This paper develops new results on the use of model predictive control to regulate the attitude of a ground station antenna. Two degree of freedom AZ-EL pedestal is considered as ground station antenna. Permanent Magnet Synchronous Motors are taken into consideration as the best choice for satisfaction of control objectives as actuators. The design is based on a two cascade controller consist of MPC and a simple feedback linearization, respectively. The proposed approach provides more smooth tracking and lower energy consumption with respect to analogous works. The model predictive controller employs integral action, resulting in zero steady-state error and load torque disturbance rejection. Realistic disturbances caused by wind and load is considered and applied to an industry-sized pedestal. The reference data of azimuth and elevation angles are chosen from a real tracking mission. The comparison of simulation results by typical PI controller, verify the effectiveness of the proposed method.
Volume 13, Issue 3 (4-2023)
Abstract
Intimacy in the organization, as a relationship or relationship through sharing work demands with others, can solve or prevent many problems. The purpose of this research was to identify the factors that promote organizational intimacy in telework conditions. The direction of the current research is developmental and its methodology is qualitative. The research approach in this study was content analysis and the unit of analysis was word and theme. Using this approach in content analysis, which was focused on words, analysis, description, description and interpretation of supporting theories and empirical texts, data were collected. Also, in this section, the research community was composed of university experts, who used the chain sampling method in the 15th interview to achieve theoretical saturation. Based on the combination of the analysis model of Sandelowski and Baros (2007) and Brown and Clark (2006), the main categories and factors of the research were identified. To evaluate the adequacy of content analysis, theoretical validity was used with the approach of receiving experts' opinions and Cohen's kappa coefficient. By reviewing and confirming the participating members in the validation process and estimating the coefficient of 0.91, the research findings had the necessary reliability and trustworthiness. According to the research findings and network model, three inclusive categories and forty one basic factors are the factors of promoting organizational intimacy. The results showed that behavioral, structural and environmental capabilities in the organization are effective in promoting organizational intimacy in remote working conditions.
Volume 14, Issue 64 (6-2016)
Abstract
The postharvest life of bottom mushroom is limited due to bacterial attack and enzymatic browning. This study was carried out in order to increasing the storability of mushroom, by antibacterial and anti-browning components. For that, the mushrooms were treated by oxalic and citric acids at concentration of 1.5 and 2.5 mM, hydrogen peroxide at concentration of 1 and 2.5%, ascorbic acid at concentration of 1.5 mM and calcium chloride at concentration of 1% as dipping for 2 min, and then treated mushrooms were packed in cellophane and stored at 4°C. Weight loss, marketability, electro leakage (EL) and bacterial colony forming unit (CFU) were measured after 8 and 16 days. According to the results, calcium chloride, ascorbic acid and hydrogen peroxide controlled browning as compared to control. However, oxalic and citric acids, despite reducing microbial load, did not show any positive effects. Calcium chloride by reducing weight loss, reducing EL and reducing bacterial load, ascorbic acid by reducing EL and reducing bacterial load and peroxide hydrogen by reducing bacterial load tended to increase postharvest life of bottom mushroom.
Volume 15, Issue 1 (1-2008)
Abstract
The current research tries to offer a conceptual model in order to create trust among people for choosing virtual universities. To this end, the conceptual model of research has been designed with nine factors. The relationship among factors tested by using statistical methods such as factor analysis and path analysis. In the end, five components were established from among the affecting factors of student trust towards these virtual universities. They are: academic reputation, administrative efficacy, size, economical factor of studying and the suitable environmental conditions for virtual universities activity. However, it was established that the role of each of these components in creating trust towards virtual universities were different from those predicted by the researchers. Also, it was established that student's willingness toward choosing virtual universities is being influenced by the trust factor.
Volume 21, Issue 3 (12-2017)
Abstract
As the goals and interests of employees wont met and satisfied through formal or informal organization structures, and they concludes that their role in organization is not recognized, they attempt to create brawl, in order to attract senior managers attentetion. The purpose of this research is to achieve a theory in identifying cause of organizational employees brawl, strategies for its management and also better understanding of the circumstances in organization and behavior change. This is a qualitative research based on data theory strategy. Semi- structural interview were used to gather data and Strauss-Corbin method used to analyze the data. Theoretical sampling has been done in managers group, which 16 interview were held with managers, faculty members and organization experts, who were experienced and had adequate knowledge about cause of such behaviors. Result obtained from interviews has led to designing organizational brawl theory in management. The model has been verified using Structural equation modeling and it was found that ten factors involved in creation of brawl in the organization.
Dr Monir Moradi, Dr Darush Hasanvand, Kaveh Derakhshani, Dr Ahmad Sarlak,
Volume 21, Issue 3 (Autumn 2021 2021)
Abstract
This research explains the impact of informal institutions (corruption control) and formal institutions (number of procedures, education and entrepreneurship training and skills, access to credit and technology absorption) on entrepreneurship development in 10 in selected Middle East and North Africa (MENA) countries, including Iran during 2005 – 2019. The type of study is descriptive. The present article estimates a panel data model by using the available data from international statistical institutes. Eviews and Stata14 software’s are used for the calculations. The results show that the if corruption control increases, the entrepreneurship will increase, since there is a positive and significant relationship between corruption control and formal institutions, and entrepreneurship development. Among the MENA countries, corruption control has the least impact on entrepreneurship in Iran and the highest impact in Qatar. Also, corruption control, training and skills and technology absorption have had great impacts on the entrepreneurship development.
Mrs. Azadeh Arab, Dr Ahmad Sarlak, Dr Mojtaba Ghiasi, Dr Maryam Sharifnezhad,
Volume 21, Issue 4 (winter 2021 2021)
Abstract
Financial development and stability and their relationship with economic growth is one of the most important and influential issues in economic growth. Therefore, economists have studied this issue by exerting different conditions. The main purpose of this study is to evaluate the impact of financial development and financial stability on Iran's economic growth using the generalized method of moments (GMM) during 1992-2019. The results show positive and meaningful effects of financial development and financial stability on economic growth. The variables of lagged economic growth, education, fixed investment and trade liberalization have positive and significant effects on economic growth, while, inflation, government expenditure and active population have negative impacts on economic growth. Therefore, considering the important role of education, it is recommended to government to invest in this sector and upgrade the production structure, make the necessary structural reforms in the capital market and banking system, direct credit and liquidity to strengthen private sector production, as well as improve the level and composition of government spending in order to increase production efficiency.
Volume 21, Issue 156 (February 2025)
Abstract
Today, the utilization of smart indicators in food packaging to monitor and detect food quality through analyzing quality data and color changes in packaging films based on the food's condition is on the rise. In this comparative study, halochromic films made of gelatin and k-carrageenan with mirabilis jalapa extract (6, 12, and 24%) and barberry extract (6, 12, and 24%) were developed and examined. Through SEM images and FTIR spectroscopy, it was observed that both types of films incorporating barberry and mirabilis jalapa extracts were uniformly dispersed in the gelatin and k-carrageenan polymer matrix, displaying notable molecular interactions like hydrogen bonding and electrostatic forces. However, films containing mirabilis jalapa extract exhibited more irregular and rough surfaces compared to those with barberry extract. Both types of films displayed good antioxidant properties and responsiveness to changes in pH and ammonia levels. Films with barberry extract demonstrated higher antioxidant activity and greater sensitivity to pH variations. The gelatin and k-carrageenan films with barberry and mirabilis jalapa extracts effectively indicated the freshness of lamb meat stored at 25°C by correlating with the presence of ammonia gases in the storage packages and pH fluctuations. Our results highlight that the structural, physical, and functional attributes of gelatin and k-carrageenan films incorporating pH-responsive extracts are significantly influenced by the extract type and concentration.
Dr Azadeh Arab, Dr Ahmad Sarlak, Dr Mojtaba Ghiasi, Dr Maryam Shariehnezhad,
Volume 22, Issue 3 (Autumn 2022 2022)
Abstract
Financial instability can lead to failure in financial markets and create macroeconomic costs. Therefore, by examining this harmful event, we can achieve conditions of economic stability and security. The main purpose of this study is to investigate the financial instability of Middle Eastern countries during the years 2000 to 2019 in a dynamic model and using a two-stage system of Generalized Method of Moments (GMM). To reach this goal, the index of instability and financial development was created on the basis of the influential variables of the banking sector and the stock market in two groups of oil exporting and non-exporting countries in the region. The estimation results show the different effects of variables on financial instability in exporting and non-exporting countries. Most countries in the region are oil exporters and the results of the estimate confirm the negative and significant impact of financial development and economic growth on financial instability. Also, in order to create a more comprehensive view, the control variables of the terms of trade, government spending and inflation have been used in the model. The first lag of financial instability and inflation variable have positive and significant effects and the terms of trade and government spending have negative and significant effects on financial instability. In oil non-exporting countries, due to less financial instability than exporting countries, the relationship between a number of variables and financial instability was not significant and different results were obtained. It is recommended that policy makers reduce financial instability by controlling prices and directing liquidity and credits to production, reforming the level and composition of government spending, and improving trade relations.
Volume 23, Issue 2 (7-2019)
Abstract
Considering the crucial position of the banking system is in the country's economic development and the competitive environment prevailing in the banking industry, designing and defining a new institutional pattern make this face on the banks to be felt. Therefore identifying the main components of the e-entrepreneurial organization dimensions and its pattern and delivering it to run on the banking system is the main aim of this paper.
The statistical society of the research has been 214 members of the managers and experts of the Refah Bank's headquarters offices in Tehran. At first the conceptual model of e-entrepreneurial organization was drown from implementation of Delphi Method. Statistical Analysis has been used in the following of identification the relationship between variables and testing 7 hypotheses considered for this study (which has been conducted through SPSS and Lisrel).
In accordance to findings of this research, if organization elements get influenced by the entrepreneurship process and the acquisition of e-readiness process, under the influence of values ruling the society and banking industry, the result will be a new face of organization which can call it “the electronic entrepreneurial organization”. Due to providing customers with new products and creating electronically values for them, EEO has more efficacy than traditional organizations.
Volume 29, Issue 1 (3-2022)
Abstract
Changing the business model of banks, entering new markets, changing the nature of traditional and classic systems to digital banking and the emergence of fintechs and startups in the banking sector on the one hand and the lack of a comprehensive view in the field of identification and Risk control, on the other, have increased the concern and risk of banks. In this paper, using the standards of the Banking Supervision Committee, the effect of intra-bank and extra-bank risk factors by data panel econometric model on capital adequacy as an indicator of bank risk management in the period 2012-2018 in listed banks (10 banks) tested and analyzed. The results of the assumptions showed that all risk indicators studied have a significant effect on the capital adequacy of banks, in addition to the risk of balance sheet structure as shown in the financial crisis of 2007-2008, also threatened by macroeconomic risk.
Volume 31, Issue 1 (Spring 2024)
Abstract
Changes in banking business model, entering new markets, switching traditional and classical systems' nature to electronic banking and entering digital banking, as well as the emergence of FinTechs and startups in the banking industry on the one hand and the lack of a comprehensive view and inclusive in the field of risk identification and control, on the other hand, increased the concern and risk of banks. What is certain is that the process and manner of change do not indicate a secure future. Therefore, the present study aims to provide a comprehensive classification of types of risks in the Iranian banking industry. The statistical sample includes the number of thirty selected experts and risk experts in the banking industry who selected by sampling method based on systematic elimination. Twenty final indicators determined for risk classification in the banking industry from among 68 extractive components obtained from literature review, obtained by repeating the Delphi method three times in 1399-1400 period. The results showed that the proposed classification of banking risk includes financial risk, operational risk, economic risk, socio-political risk, compliance risk, and knowledge and technology risk. The validating results through the Delphi technique showed that Cronbach's alpha coefficient for the third round was equal to 0.899 and indicated that all indicators were significant and valid and there was a high level of consensus among experts.
