Judul: Kemitraan dalam pengelolaan hutan rakyat di Koperasi Wana Lestari Menoreh, Kabupaten Kulonprogo, Daerah Istimewa Yogyakarta
Abstrak: Pengembangan hutan rakyat saat ini dilakukan melalui beberapa skema pemberdayaan, salah satunya melalui program kemitraan. Kemitraan dalam pengelolaan hutan rakyat memberikan dampak positif baik secara ekonomi maupun sosial. Tujuan penelitian ini adalah menjelaskan pengelolaan dan kemitraan hutan rakyat di Koperasi Wana Lestari Menoreh (KWLM). Responden dalam penelitian ini berjumlah 1 pengurus dan 120 petani anggota koperasi. Hasil dari penelitian ini menunjukkan bahwa dalam pengelolaan hutan rakyat pada sub sistem produksi, 22.50% petani melakukan pengaturan jarak tanam dan 72.50% petani melakukan pemeliharaan mandiri. Sub sistem pengolahan hasil, petani menjual secara langsung dalam bentuk log, 12.50% petani memanfaatan kayu sebagai bahan bangunan rumah, sedangkan penggunaan sebagai kayu bakar 13.33% petani. Sub sistem pemasaran, penjualan kayu ke tengkulak mengunakan sistem borongan dengan taksiran pohon berdiri, sedangkan penjualan ke KWLM berdasarkan kubikasinya. Selama menjadi anggota KWLM, terdapat 30.83% petani yang pernah menjual kayu ke tengkulak. Petani hutan rakyat dan KWLM melakukan kemitraan jangka panjang, yang meliputi aspek produksi dan pemasaran kayu hutan rakyat. Manfaat yang dirasakan petani yaitu mendapatkan bibit, premium price, sisa hasil usaha, pengetahuan pengelolaan hutan, persaudaraan antar petani, kemudahan menjual kayu, serta dapat kesempatan melakukan simpan pinjam
Keyword: privat forest management, partnership, Wana Lestari Menoreh Cooperative (WLMC)

Judul: Modal sosial Petani dalam pengelolaan hutan rakyat Koperasi Wana Lestari Menoreh (Desa Pagerharjo, Kabupaten Kulon Progo, D.I. Yogyakarta)
Abstrak: This study aimed to find the information about social capital elements that were owned by the private forest farmers of Wana Lestari Menoreh cooperative members. These elements of social capital comprised of trust, social networking, and social norms. The data used in this study were (1) The system of community forest management, (2) The institutional role of the cooperatives, (3) The social capital from the member of farmers. Family-based land management was an important aspect that determined the private forest management at Pagerharjo. The respondents’ trust indicated the level of an average score of 8.37 (high category). The basis of the respondents’ trust was the ability and intention of cooperative as an institution in managing and marketing wood product of the members. In addition, a cooperation between the Wana Lestari Menoreh cooperative and credit union Kharisma Taliasih could help farmers to get a creditloan with tree ownership as collateral. The social networking of respondents indicated a score in an average of 8.43 (high category). The ability of the respondent farmers to build a number of associations and social networks was shown by the existence of social relations, broadness, and openness. The mean score of social norms was 8.10 (high category). The high score of social norms was due to the relationship of trust and cooperation rules among the society to realize the forest land management.
Keyword: Bogor Agricultural University (IPB), social capital, private forest, forest cooperative institution

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