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The method fuzzy is one part of the fuzzy inference system that is useful for drawing conclusions or the best decision in uncertain problems. Currently, about 200 countries in the world are experiencing the Covid-19 pandemic. Various policies were carried out to overcome this. In addition to the health protocols that are always implemented, the community must also know the conditions of the area where they live so that they can anticipate any activities carried out. The method is used fuzzy to determine the risk zone for the spread of Covid-19 in North Sumatra Province based on 3 variables, namely positive cases, suspected cases, and dead cases. The data used in this study is weekly Covid-19 data from March 2021 to July 2021 for 4 selected areas, namely Medan City, Pematang Siantar City, Simalungun Regency, and Central Tapanuli Regency. All variables are represented using triangular curves and their membership functions are determined. Then the implication function of the min is used to determine the rules used. From the results of the implication function, the composition between all the rules obtained is carried out by taking the maximum rule then that value is used to modify the fuzzy area so that a new membership function is obtained. The method is used centroid to obtain a crisp or the final result is the value of the risk zone. This research also utilizes the Matlab to calculate the results. The results from the use of the Mamdani method will be compared with the real risk zone data so as to produce a 75% average percentage similarity for the data for 4 regions in North Sumatra so it can be concluded that the model made is good enough to determine the risk zone for the spread of Covid-19 in North Sumatra Province.

The Erlang distribution is a special case of the Gamma distribution with the k shape parameter and the λ rate parameter. In this study, the parameter estimation of the Erlang distribution was carried out using the Maximum Likelihood method. In maximizing the function, an implicit and non-linear form is obtained, then it is solved using the Newton Raphson algorithm. Apart from Newton Raphon, the estimation of parameters was also carried out using the Fisher Scoring algorithm. The Fisher Scoring algorithm is similar to the Newton Raphson algorithm, the difference is that Fisher Scoring uses an matrix information. The result of parameter estimation in Erlang distribution using Newton Raphson algorithm which is applied to outgoing telephone call data that generated by Matlab R2010a software cannot be done simultaneously. Therefore, the parameter assessment is carried out on the k parameter first, then followed by the λ parameter estimation and the parameter and  = 0.6886812 are obtained. Meanwhile, the parameter estimation using the Fisher Scoring algorithm produces an equation that is not different from the Newton Raphson algorithm

Food and agricultural products are perishable, so they have the potential to experience losses, both in quality and quantity during the post-harvest process and processing due to physiological changes in the form of physical, chemical and microbiological. As an effort to reduce losses during post-harvest and physiological changes, it is necessary to apply appropriate technology (appropriate technology). The application of ozone technology in the handling of fruits, vegetables and fishery products has good prospects because it is felt to be safe and effective. Ozone (O3) has the main function, namely as an oxidizer and disinfectant or a combination of these two functions. The high oxidation potential of ozone can be used to kill bacteria (sterilization process), remove color (decolorization process), remove odors (deodorization process), and decompose organic compounds (degradation process). The treatment of ozonized water in the storage of food products and agricultural products does not damage their nutritional content, because the ozone content itself will be lost by evaporation. If ozone is exposed to sunlight it will break down into oxygen compounds again. Utilization of ozone technology is widely used to reduce contamination and extend the shelf life of fresh fruit, vegetables and fishery products. This paper examines and synthesizes several research results related to the use of ozone for fruits, vegetables and other agricultural commodities during the postharvest process and handling of agricultural products.

Puskesmas as a provider of basic health services has a very important role in maintaining public health. If it functions properly, the puskesmas will be able to provide quality services for people in need. The success of puskesmas in carrying out their programs is determined by the availability of human resources (HR) that are balanced between medical personnel on one side and promotive and preventive personnel on the other. The relationship between ability, workload, work discipline, and work motivation with the performance of health workers is obtained that there is a relationship between ability, workload, work discipline, and work motivation with the performance of health workers. Research Objectives: The purpose of this study is to analyze the suitability of the main tasks and functions (tupoksi) with education and skills as well as means of supporting work. Research Methods: The author of this article uses a descriptive qualitative method that seeks to describe an object or subject of an inductive nature. Result: Inappropriate tupoksi due to limited health workers in puskesmas, especially limited skills based on the type of education. As a result, there are health workers who are in charge of programs that do not match their skills. Conclusion: The lack of health workers makes the tupoksi incompatible with the educational background of the staff in charge of the program at the Puskesmas.