Judul: Pola Kemitraan antara Petani dengan UBH-KPWN dalam Usaha Hutan Rakyat Jati Unggul Nusantara di Desa Ciaruteun Ilir, Kabupaten Bogor
Abstrak: Usaha Bagi Hasil Koperasi Perumahan Wanabakti Nusantara (UBH-KPWN) is a business unit developed by the Forestry Department engaged in the farming of National Superior Teak (JUN). UBH-KPWN applies the concept of profit sharing partnership in farming activities. This partnership system is specifically made by UBH-KPWN in order to maintain the farming continuity of national superior teak (JUN). The partners of UBH-KPWN include farmers, investors, landowners and the village government. To determine the forms of partnership between UBH-KPWN and its partners (farmers, investors, landowners and the village government), it is necessary to study the feasibility and the extent of partnership, whether it is beneficial to both parties. This research was conducted from April through June 2011 in the village of Ciaruteun Ilir, Cibungbulang District, Bogor Regency. The data in this study were collected using interviews and a survey. The respondents were selected by a stratified purposive sampling method based on the land area under cultivation. The number of respondents was 60 people. The analysis of the feasibility of community forests in terms of partnership was done in two phases: (1) analysis of cost sharing and (2) partnership-level analysis by a scoring method. The partnership pattern of the community forest in Ciaruteun Ilir village is feasible for the farmers, UBH-KPWN, investors, landowners and the village
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Judul: Pola Hubungan antara Petani dan Koperasi dalam Pengusahaan Hutan di Desa Cihowe dan Desa Cogreg BP3K Kabupten Bogor
Abstrak: The aim of study is to explain participation of farmers for managing forest, to explain the pattern of relation between farmers and cooperative on forest management which is compared to the pattern of relation between farmers and middlemen, and to explain perception of farmers about the role of forest management on increase total income of farmers. The study used survey method with random sampling for respondents. Total of respondents were 33 respondents; 18 JUN farmers, 12 non-JUN farmers, and 3 respondents of cooperative. Participation of farmers to follow steps of forest management is a factor for affecting the total good trees of farmers. The pattern of relation between farmers and cooperative is single stranded. This relation is defined as single commercial relation and it is also happened between farmers and middlemen. The same relation pattern to cause the positive and negative impact differently for farmers. Perception of farmers included in the category is high (>50%). Forest mangement is able to increase the total income of farmers from wood sale with cooperative and middlemen are as wood buyers.
Keyword: single stranded., cooperative, forest management

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