The transmission of infectious disease in epidemiological models usually is based on the assumption that population within random-mixing. Although medical developments can reduce the consequences of the spread of infectious diseases, prevention of plague remains a major toehold. After a model is formulated containing the main fitur the development and transmission of infectious disease, onward to the model can be used to predict, making eradication strategies, control or prevent the spread. Modeling the spread of the disease has the potential to improve the quality of human life. The social life of humans far more complex exceed a diverse population. The transmission dynamics of infectious diseases is sensitive to patterns the interaction between the individual vulnerable (susceptible) and contracted (infectious). Human social contact very heterogeneous group. To predict the impact of this pattern against the transmission of infectious diseases, the use of epidemiological random network model, where the nodes serves individuals exposed, contracting or cured and connectedness presents contact transmission. Type the model spread (epidemic) that examined the model type is exposed, tetular exposed, and cured, or better known as a type of SIRS.

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Graph theory is part of the field of mathematics that can be applied in various other fields of science to solve problems. One of them is the problem of determining the color on the map. The map that will be colored here is a map of the Deli Serdang regency which consists of 22 sub-districts. The coloring of the map is done by first modeling it in the form of a graph. One way to determine the minimum color of a graph is to use a greedy algorithm. From the map, we get a dual graph with 22 vertices and 41 edges. Based on the greedy algorithm that has been applied, the minimum number of colors is obtained as many as four colors, namely blue, green, red, and yellow with each district directly bordering having a different color. The results of map coloring by applying the greedy algorithm are also obtained with the help of the python 3.7 programming language.

The purpose of this study was to analyze the influence of corporate identity management, internal brands, and corporate culture on employee brand support behavior. This study seeks to fill the gap from the findings of previous studies where the setting is mostly done in service companies and not in the production sector. Thus the results of this study will enrich the discussion about employee brand support behavior. The population in this study were employees of small, halal-oriented companies in East Java. While the sample was taken as many as 200 employees from six cities. Small and medium companies that participate in this research are in the fields of fruit chips, salted eggs, textiles. There are three hypotheses to be tested in this study. Data were analyzed with statistics to determine the relationship between the variables studied and exploratory factor analysis. The results showed that the majority of respondents were male of the Javanese race. The mean age was 34, mostly in middle and high school backgrounds. Furthermore, most of them are married, most of them work in general affairs and production with permanent employee status. The majority of respondents only get a monthly income of between IDR 1,000,000-2,000,000. Finally, around 50% of respondents have a working period of 1-3 years. The results showed that corporate identity management has a significant effect on employee's brand support behavior. Internal Brand has a significant effect on Employee Brand Support Behavior. Organizational culture has a significant effect on brand support behavior. Suggestions that can be conveyed in research include work culture and Islamic values that have been adhered to by employees also need to be maintained by company leaders. During their breaks and prayers, they should be given sufficient time, but it does not interfere with the company's productivity. Also, the leader must explain that the company where the employees work is a relatively new business operating so that the company has not been able to provide decent income to most of them. However, along with the growth of these MSMEs, employee salaries are expected to get better. The support showed by employees so far must be maintained and maintained so that they feel cared for by the leadership.

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