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In recent years, the most important philosophy agreed upon by organizations has been to create both economic, social, and environmental value in the form of the concept of sustainable management. Circular economy is a new concept to account for the sustainable management. The main purpose of this study is to analyze the performance of manufacturing industries from the perspective of the circular economy components. This research was conducted in the second half of 2020. The statistical population of this study includes the food industries in Bushehr province, which due to the limited size of the population, all of them were selected as statistical sample. The data collection tool of this research is a researcher-made questionnaire whose validity was checked by face content analysis method and its reliability was checked by Cronbach's alpha method. In this research, first, by studying the theoretical foundations and empirical background, effective components in circular economics were identified. Then, using the k-means algorithm, clustering of selected food industries was performed. The results showed that the food industries are in two industrial clusters: circular and linear. Next, the species detection function was obtained. It is suggested that linear industrial cluster managers pay more attention to energy efficiency, water consumption management, and sales of recyclable materials in order to transition to a circular economy. This research is of innovative nature in terms of developing the theoretical concept of circular economy and applying it to improve the performance of the food industry.

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Aim and Introduction 
In the last decade, the design of the green supply chain network has become very important due to the increase in competition in global markets to achieve success, which requires the simultaneous commitment and cooperation of suppliers, manufacturers and distributors in the form of a network. One of the generalizable fields of the green supply chain network is the aquatic processing industry as one of the most important food industries that has paid less attention to optimize its supply chain in order to provide environmental benefits. In recent decades, the demand for food has increased more than the capacity to provide resources for it. Hence, the traditional food supply chain can no longer effectively manage demand. The increase in world population, globalization, global warming, drought and groundwater crisis in recent years have led to the loss of natural resources needed for animal husbandry and the reduction of marine reserves in Iran as well as in other Middle Eastern countries. The expansion of aquaculture farms has not only contributed to the development of sustainable food in the country, but has also been very effective in preserving endangered species. The aquaculture industry has grown significantly in recent decades. In this industry, green supply chain network design seems to be critical for aquatic processing.
Methodology
This study is a descriptive research and applied one in terms of purpose. In this research, after examining the theoretical foundations and experimental background, the network design was proposed. The aquatic supply network was designed in three levels, for four farms, three factories, and two customers. The first level includes aquaculture farms. The second level consists of models of aquatic processing factories. The third level includes customer networks. Of course, other levels of the aquaculture supply chain, i.e. retailers, can also be considered in network design. Then the appropriate mathematical model was formulated and validated with a case study. LP-metric method was used to solve this model. The GAMS software was used in this study.
Findings
In this research, the network of green aquatic management has been designed to achieve the goals of minimizing costs and carbon dioxide emissions and maximizing the capacity of units at three levels for four farms, three factories, and two customers. In this research, after drawing the network of the problem and explaining the mathematical model, it was solved using the comprehensive criterion method with p equal to 1, 2, and 3.
The value of the objective function was calculated with p equal to 0.09. By increasing the value of p, it became clear that there is no distance between the values of the objective functions and the ideal values. Then, the value of decision and binary variables was calculated. The first factory has the highest aquatic receiving capacity from the second, third and fourth farms.
Discussion and Conclusion
In order to achieve the goals with an emphasis on reducing the carbon footprint, the first factory should process the third product, the second factory should process all three types of products, and the third factory should process the second product. In this research, certainty is considered for the parameters. If the surrounding environment is very dynamic, this turbulence can increase the uncertainty of model parameters. Therefore, it is suggested to solve the research model assuming uncertainty in the parameters in other researches. In this research, the same weight has been considered for three purposes.
In this study, it is assumed that the transportation cost between nodes depends only on the distance. It is important to note that the cost of transportation between two points can be affected by various factors. Therefore, it is suggested to pay attention to these factors in other researches. Using the research model can minimize the total costs in the aquaculture network and maximize the capacity of using the components of the entire chain, bringing the environmental destruction to the lowest level. Therefore, it is suggested to use this model. One of the factors affecting the production and emission of carbon is the number of car trips. In other words, the lower the number of trips (carrying times), the lower the emissions. It is suggested managers to use a means of transportation with a higher capacity. Timely servicing of goods transport vehicles can also be effective in carbon emissions. It is recommended to periodically repair the car. In the chain under study, most of the cars were worn out and without fuel consumption reduction technology. It is suggested to replace the old vehicles carrying goods with modern and high-tech vehicles. It is recommended to use gas-fueled vehicles for transporting goods.
 

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Today, human life has become increasingly like games, not just because games have become a big part of human life, but most of the activities, systems and services are game-based. Therefore, the main challenge for organizations in the current digital age is to use skill-based game systems to enhance employee motivation and learning. The main purpose of this study was to investigate the game-based capabilities of learning management systems (LMS). This research, in terms of purpose, is in the field of applied research and in terms of method, in the form of qualitative-quantitative research. In first, a number of seven capabilities were identified by studying theoretical background and empirical background and obtaining expert opinions. The statistical population of the study includes professors as well as administrators and experts. The number of ten of them were selected as sample members. Data collection tool was a researcher-made questionnaire whose validity was confirmed by content analysis method and its reliability by Kendall's coefficient. To analyze the data was used the CRITIC-COPRAS approach. The results show that among the four types of learning management system studied, iSpring LMS received the highest score. Finally, discussion and conclusions are presented.