In this paper we study the effect of vaccination control, medical treatment and spraying to malaria epidemic model. Firstly the non-control malaria epidemic model is generated and the equilibrium point is determined. Afterward, the stability of equilibrium point in previous model is investigated. The research is continued by deciding the optimal control of malaria epidemic model and minimizing the cost. The results show that the control effect can reduce the subpopulation of infected human and mosquitoes.
The purpose of this study was to determine the influence of ship's seaworthiness and compensation system towards ship's crew job satisfaction at PT. Humpuss Bulk Transportation Jakarta. The populations in this study were seafarers at PT Humpuss Bulk Transportation -Jakarta. The research method used in this study was descriptive and explanatory survey methods with a sample of 20 respondents. Data analysis was performed using SPSS version 25. Based on the results of the study, the size of the contribution of ship's seaworthiness to the crew's job satisfaction at PT. Humpuss Bulk Transportation is 63.1% while the remaining 36.9% is influenced by other factors. The first hypothesis in this study examines whether the ship's seaworthiness partially affects to the job satisfaction of the crew. The results of this study indicate that the ship's seaworthiness has a positive effect on crew job satisfaction. The second hypothesis in this study examines whether the compensation system partially affects the job satisfaction of the crew. The results of this study indicate that the compensation system has a positive effect on crew job satisfaction, so the second hypothesis is accepted. The ship's seaworthiness variable and compensation system together have a positive effect on the crew's job satisfaction. The ship's seaworthiness and compensation system has a positive effect to the ship crew job satisfaction, so the third hypothesis is accepted.
Maritime workers are workers who are regulated internationally through the Maritime Labour Convention (MLC) 2006 which has been ratified by the Indonesian government through Law No. 15 of 2016. In the convention regulated aspects include health care on ships and land, social security, welfare facilities on land, access to seafarers' complaints, protection of health and safety, and accident prevention. This study aims to evaluate the application of the convention so far through the gap analysis method and index performance analysis (IPA). Gap analysis is used to get the difference between the performances and expectations of the respondents. To see the variables that need to be improved, maintained, not a priority for improvement or variables that are above expectation then used the IPA model. This research examines how seafarers' performances and expectations are related to the implementation of MLC in Indonesia, especially in the aspects of health care, social security, and welfare on board. The results show that almost all research variables suggest a gap although relatively small in value. First, it can be summarized that there are several variables that need to be improved such as Protection and health care, Hospitals on board, and complaints. These variable variables need to get attention for future improvements. There are several variables that need to be maintained such as visit a doctor, health, sick, disability, opportunity to use telephone and internet access, procedures for handling complaints, occupational health and safety (OHS), risk assessment, and safety meetings. Last, variables that are considered excessive in implementation should also get the attention that is medical publications, medical equipment, occupational health, and safety checks.
One of the indicators of economic growth in a country is that the income in a country has increased. Economic growth can be calculated from real national income. Economic Growth Medan City is one of the cities that has a fairly high level of economic growth. So this study aims to analyze the determinants of investment, interest rates, labor on economic growth in the city of Medan. The results obtained from this study are (1) the Gross Regional Domestic Product of Medan City is positively related to all explanatory variables, namely the Medan City workforce and Medan City's Gross Regional Domestic Product last year (PDRBt-1). All signs of the alleged parameters are in line with expectations, the variable that has a significant effect is the Regional Domestic Product of Medan City last year. The estimation results show that an increase in the number of Medan City workers by 10 units will encourage an increase in Gross Regional Domestic Product by 99 units per year, (2) Medan City Household Consumption is positively related to all explanatory variables namely Consumer Price Index, Gross Regional Domestic Product Medan City, Export Value and Household Consumption of Medan City last year (PRKTt-1). All signs of the estimated parameters are in line with expectations, the variables that have a significant effect are the Consumer Price Index and the Regional Domestic Product of Medan City. The estimation results show that if the Medan City Consumer Price Index is increased by 10 units, it will encourage Medan City Household Consumption by 10 units.
Adjustment during work requires extra precision. With the process of self-adjustment, work productivity can be overcome so that it does not have an impact on pressure at work. The purpose of this study was to examine the relationship between work stress and work productivity with adjustment to employees at the Bina Karya Harapan Jaya Social Institution in Balaraja. The data collection method in this study used a quantitative method using a scale which included the independent variable, namely work stress and the dependent variable in this study, namely self-adjustment. The respondents used in this study were 31 PJLP employees of the Bina Karya Harapan Jaya Social Institution in Balaraja. Sampling in the research used is saturated sampling. Measuring tool used is the scale of work stress, work productivity, adjustments were analyzed using the SPSS application version 24.0 for Windows. The results showed that there was a significant relationship between work stress and self-adjustment, obtaining a correlation rx1y = -0.175 P = 0.347; P < 0.05 ; Ho accepted. Then between work productivity and self-adjustment obtained a correlation of rx2y = 0.206 P = 0.267; P < 0.05 ; Ho accepted. From the results of this study it can be concluded that overall work stress and work productivity with self-adjustment of employees are in the high category. Then between work productivity and self-adjustment obtained a correlation of rx2y = 0.206 P = 0.267; P < 0.05 ; Ho accepted. From the results of this study it can be concluded that overall work stress and work productivity with self-adjustment of employees are in the high category. Then between work productivity and selfadjustment obtained a correlation of rx2y = 0.206 P = 0.267; P < 0.05 ; Ho accepted. From the results of this study it can be concluded that overall work stress and work productivity with self-adjustment of employees are in the high category.
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