Leadership style plays an important role on job satisfaction in educational systems. In this paper, we present a study among 180 school principals in city of Khomeinishahr, located in province of Esfahan, Iran. The study selects a sample of 123 principals and examines ten hypotheses including the effects of personality trait neuroticism, extroversion, resilience, participative, conscientiousness on job satisfaction. The study also investigates the impacts of transformational leadership style, transactional leadership style and Laissez – fair leadership style on job satisfaction. Finally, the study considers the relationship between personality trait neuroticism and transformational leadership style as well as personality trait extraversion and transformational leadership style. The study uses Pearson correlation test and verify that nine out of ten hypotheses have been confirmed and the relationship between Laissez – fair leadership style and job satisfaction is not confirmed.

Empowering employees play essential role on increasing the productivity of any business units. In this paper, we present an empirical investigation to study the impact of spiritual on empowering employees of Payame Noor university in city of Tehran, Iran. The study uses two benchmark questionnaires to examine the hypotheses of this survey. There are seven sub-hypotheses associated with this study including the relationship between empowering employees from one side and vision, friendship, faith to work, being meaningful, organizational membership, organizational commitment and performance feedback. The results of implementation of structural equation modeling confirmed all sub-hypotheses except commitment.

During the past two decades, internet has penetrated into people’s personal lives, significantly. People communicate with each other through internet facilities such as email services, social web pages, etc. Internet has influenced so much of our lives that many people get addicted and it has become a serious issue among different societies. In this study, we perform an empirical study to find the relationship of three issues of age, gender and employment status on internet addiction behavior. The survey selects 190 men and 160 women from a city of NajafAbad located in province of Esfahan, Iran and a questionnaire consists of 35 questions are distributed among them. The survey uses Chi-Square statistics to examine the effects of three mentioned factors and the results indicate that internet addiction is more among singles than married (Chi-Square=19.94). The survey also indicates that internet addition is more on men than women do (Chi-Square=6.64). However, our survey does not find any evidence to believe job employment has any impact on internet addiction.

The primary objective of this paper is to develop a comprehensive method to learn the effect of knowledge management (KM) practices on organizational performance. The balanced scorecard (BSC) is applied to materialize this comprehensiveness. In order to prevent research dispersion, the selective indicators in KM are oriented to some critical success factors influencing KM implementation. In addition, the mentioned effect is analyzed by path analysis using structural equation modeling (SEM). The results indicate that KM practices maintain some impacts on the overall performance. Finally, KM practices only influence learning and growth among dimensions of BSC, significantly. Likewise, data analysis states other significant impact among performance dimensions in terms of BSC model.

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Due to the increasing technological advances in all fields, a considerable amount of data has been collected to be processed for different purposes. Data mining is the process of determining and an-alyzing hidden information from different perspectives to obtain useful knowledge. Data mining can have many various applications, one of them is in medical diagnosis. Today, many diseases are regarded as dangerous and deadly. Heart disease, breast cancer, and diabetes are among the most dangerous ones. This paper investigates 168 articles associated with the implementation of data mining for diagnosing such diseases. The study concentrates on 85 selected papers which have received more attention between 1997 and 2018. All algorithms, data mining models, and evaluation methods are thoroughly reviewed with special consideration. The study attempts to determine the most efficient data mining methods used for medical diagnosing purposes. Also, one of the other significant results of this study is the detection of research gaps in the application of data mining in health care.

The project scheduling problem is both practically and theoretically of paramount importance. From the practical perspective, improvement of project scheduling as a critical part of project management process can lead to successful project completion and significantly decrease of the relevant costs. From the theoretical perspective, project scheduling is regarded as one of the in-teresting optimization issues, which has attracted the attention of many researchers in the area of operations research. Therefore, the project scheduling issue has been significantly evaluated over time and has been developed from various aspects. In this research, the topics related to Re-source-Constrained Project Scheduling Problem (RCPSP) are reviewed, recent developments in this field are evaluated, and the results are presented for future studies. In this regard, first, the standard problem of RCPSP is expressed and related developments are presented from four as-pects of resources, characteristics of activities, type of objective functions, and availability level of information. Following that, details about 216 articles conducted on RCPSP during 1980-2017 are expressed. At the end, in line with the statistics obtained from the evaluation of previ-ous articles, suggestions are made for the future studies in order to help the development of new issues in this area.

The condensation of several aromatic/heteroaromatic aldehydes with 2-aminothiophenol under melt reaction conditions afforded 2-arylbenzothiazoles under solvent-free conditions. The major advantages of the present method are high yields, short reaction times, and eco-friendly conditions.

An ionic liquid 1-Butyl-3-methylimidazoliumchloride[BMIm]Cl/sodium hydroxide system, was employed as a catalyst for the fast and one-pot crossed aldol-condensation of various aromatic aldehydes and cyclic ketones, to produce a variety of substituted ?,? & apos; -bis(benzylidene)-cycloalkanones under neat conditions. This process is simple, efficient and environmentally benign and proceeds in high yield and short reaction times. The ionic liquid can be recycled for subsequent reactions without any appreciable loss of efficiency.

Manufacturing facilities are systems that require adequate designing, maintenance and reservations for improvement in the future. Layouts need to be effectively designed to reduce operating to the minimum. Computer simulation is a process of investigating and analyzing the behavior of production processes for effective decision-making using computers to generate solutions that will positively impact short, and long-term planning of the Plants and save costs of real-life implementation. This study investigated a 500Kg capacity shea nut processing plant using FlexSim©. The findings from the initial model were not effective and experienced bottlenecks in workstations (Roaster and Milling) sections, poor cycle and lead times coupled with manual labor, Plant efficiency was 35.7%. However, the Improvement Layout Model was able to address these bottlenecks, the results showed the Plant efficiency increased to 83.3%, shorter lead and cycle times, improved machine utilization, and throughput capacity of the Plant. The results were an indication of conformance to the layout design developed to aid in enhancing the traditional shea nut processing that is largely dominated by traditional processing practices.

Business trades among individuals, companies, firms, enterprises, and governments are rapidly expelled from their traditional mode, which were mainly based on paper-based exchange, and are geared towards trading through information-based systems. E-commerce has opened up a new field in terms of speed, efficiency, cost savings, and the exploitation of fleeting opportunities. This paper evaluates different authentication methods for online banking in Parsian Bank, which is one of the biggest private banks in Iran. The study designs a questionnaire and distributes it among some experts to find cause and effect factors based on a multi-criteria decision making technique named Decision Making Trial And Evaluation Laboratory (DEMATEL). The study evaluates 12 criteria and divides them into two groups of cause and effect. “Use of mobile systems in authenti-cation methods”, “Authentication with fingerprint and smart card”, “Authentication with bank card and password”, and “Authentication with digital signatures and passwords” are considered as the causative group, while “Authentication with a bank card”, “Biometric authentication and disposable codes” and “Authentication with digital signature” are among the effective group.