Judul: Kelayakan usaha kapulaga (Amomum cardamomum) di desa sedayu kecamatan loano kabupaten purworejo, wilayah kph kedu selatan perum perhutani unit 1 Jawa Tengah
Abstrak: One of the medicinal plants needed by community is cardamom (Ammomum cardamomum) but relatively little in supply. It is one of the herb plants which has high economic value and good prospects. Its potential development in Indonesia is quite high, but the increasing of production do not fulfill the market demands on domestic and international yet. Regarding to this case Sedayu farmers try to optimize the using of Perhutani land through planting cardamom as sidelines plant on pine stands. The election of cardamom as sidelines plant was not without reason. Basically multicultural planting can be more profitable if those plants could maximally exploit environmental resources along growth period. The decision for conservation of monocultural pine into multicultural with cardamom are needed to be reviewed in financial aspect avoid the risk in order to of loss and analysed see the marketing prospects in Sedayu. Primary data were collected by using Purposive Sampling method. This means that each element did not get the same chance to be selected. The taken samples foe particular purpose were 40 farmers, through interviewing and observing. While method to determine the market prospects is survey, which used Snowball Sampling in respondents taking. Based on beginning of this identification would be found in the next sample units, which determining the initial sample and the next samples based on the information obtained. The results of on financial aspect analysis including NPV, Net B/C, IRR, and Payback Period, the cardamom cultivation in Sedayu were worthed to be conducted. This is indicated by the value of NPV > 0 amount of IDR 31,885,009; Net B / C> 1 is 1.3; and IRR of 22.29%, where the value is higher than interest rate (discount factor) of 13% and the payback period obtained in cardamom cultivation is 4.23 (4 years 3 months). Cardamom cultivation has good market prospects. This is caused by the demand for cardamom still relatively high. The number of requests from traders still not be fulfilled by farmers so that the value of excess demand is high.
Keyword: 

Judul: The Development Of Indonesia Cardamom Export And The Factors That Affect
Abstrak: Agricultural sub-sector in Indonesia medicinal crops are one of the advantages that have great potential to develop and affect the national economy. Cardamom is a medicinal plant, and a food stitch. Indonesia already exports cardamom to international markets and has the potential to be the world's largest spice exporter. Indonesia with good cardamom quality and large quantity, cardamom can be one of the great export commodities and can be utilized to increase the country's foreign exchange and increase farmers' income in Indonesia. The purpose of this study is to analyze the condition of cardamom development in the international market, analyze the factors affecting cardamom exports in Indonesia, and analyze the development of Indonesia's cardamom exports to international markets. This research will use multiple linear regression analysis with ordinary least square (OLS). Secondary and variable data used in this study are: (1) cardamom production volume, (2) cardamom export price, (3) rupiah real exchange rate against dolar, (4) world oil prices, (5) Indonesia GDP annual growth. All variables data used in the period from 2000 to 2019. The result of this research shows the factor of cardamoms export affected significantly by production volume and world oil prices., Agricultural sub-sector in Indonesia medicinal crops are one of the advantages that have great potential to develop and affect the national economy. Cardamom is a medicinal plant, and a food stitch. Indonesia already exports cardamom to international markets and has the potential to be the world's largest spice exporter. Indonesia with good cardamom quality and large quantity, cardamom can be one of the great export commodities and can be utilized to increase the country's foreign exchange and increase farmers' income in Indonesia. The purpose of this study is to analyze the condition of cardamom development in the international market, analyze the factors affecting cardamom exports in Indonesia, and analyze the development of Indonesia's cardamom exports to international markets. This research will use multiple linear regression analysis with ordinary least square (OLS). Secondary and variable data used in this study are: (1) cardamom production volume, (2) cardamom export price, (3) rupiah real exchange rate against dolar, (4) world oil prices, (5) Indonesia GDP annual growth. All variables data used in the period from 2000 to 2019. The result of this research shows the factor of cardamoms export affected significantly by production volume and world oil prices.
Keyword: Cardamom, Export, Medical Plants, multiple linear regression analysis, Ordinary Least Square.

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model