The Analysis of SEIRS-SEI Epidemic Models on Malaria with Regard to Human Recovery Rate

This article discusses SEIRS-SEI epidemic models on malaria with regard to human recovery rate. SEIRS-SEI in this model is an abbreviation of the population class used in the model, ie Susceptible, Exposed, Infected, and Recovered populations in humans and Susceptible, Exposed, and Infected populations in mosquito. These epidemic models belong to mathematical models which clarify a phenomenon of epidemic transmission of malaria by observing the human recovery rate after being infected and susceptible. Human population falls into four classes, namely susceptible humans, exposed humans, infected humans, and recovered humans. Meanwhile, mosquito population serving as vectors of the disease is divided into three classes, including susceptible mosquitoes, exposed mosquitoes, and infected mosquitoes. Such models are termed SEIRS-SEI epidemic models. Analytical discussion covers model formation, existence and stability of equilibrium points, as well as numerical simulation to find out the influence of human recovery rate on population dynamics of both species. The results show that the fixed point without disease ( ) is stable in condition  and unstable in condition . The simulation results show that the given treatment has an influence on the dynamics of the human population and mosquitoes. If the human recovery rate from the infected state becomes susceptible to increased, then the number of infected populations of both species will decrease. As a result, the disease will not spread and within a certain time will disappear from the population

Strategi Pemasaran Program Wakaf Yayasan Hutan Wakaf Bogor

The high rate of deforestation makes the forest waqf program attractive to be developed as a support for the reforestation program. The research will identify variables that can influence waqf decision-making. Data collection used a research questionnaire with a sample of 100 people using Judgment Sampling. The analytical tool used in this research is Structural Equation Modeling (SEM) with Partial Least Square (PLS) approach. The results showed that registered buyers of forest waqf products at the Bogor Waqf Forest Foundation were dominated by millennials with single status and incomes between IDR 1,000,000 – IDR 2,000,000. Brand and customer trust affect the marketing effectiveness of trust in forest waqf products. The priorities for the marketing strategy for forest waqf products include strengthening brand image, increasing consumer confidence, conducting social activities, maintaining communication with consumers, and conducting regular data analysis and evaluation