Judul: Modeling System in the Context Establishment of The Community Forest Management Unit of Sengon (Paraserianthes falcataria) (Case Studies in the Cikalong Village, Cikalong District, Tasikmalaya Regency, West Java).
Abstrak: Salah satu alternatif pemecahan masalah untuk mengatasi tekanan terhadap sumber daya hutan dan guna memenuhi kebutuhan masyarakat akan bahan baku kayu adalah dengan pembangunan hutan rakyat. Pola penanaman yang digunakan adalah sistem agroforestry. Pengelolaan hutan rakyat yang ideal memungkinkan pemiliknya menerapkan manajemen yang lebih fleksibel dan efektif dalam pengaturan hasil maupun pengawasannya. Penelitian ini bertujuan mempelajari sistem pengelolaan hutan rakyat, menyusun model unit pengelolaan dan mengidentifikasi kelayakan usaha hutan yang ada di Desa Cikalong. Penelitian ini dilaksanakan pada bulan November 2010 sampai Januari 2011 di Desa Cikalong, Kecamatan Cikalong, Kabupaten Tasikmalaya, Jawa Barat. Penelitian ini dilakukan dengan sistem wawancara dan observasi lapang menggunakan teknik purposive sampling terhadap 90 responden yang memiliki lahan hutan rakyat berdasarkan luasan lahannya. Data yang dicari dalam penelitian ini antara lain, data primer meliputi kegiatan pengelolaan hutan rakyat yang dilakukan oleh para petani. Sedangkan data sekunder berasal dari Dinas Kehutanan dan Perkebunan Kabupaten Tasikmalaya. Dalam membangun suatu model diperlukan 5 (lima) tahap yaitu identifikasi isu, tujuan dan batasan, konseptualisasi model, spesifikasi model, evaluasi model dan penggunaan model. Selanjutnya mengidentifikasi kelayakan usaha berdasarkan kriteria nilai NPV (Net Pressent Value), BCR (Benefit Cost Ratio) dan IRR (Internal Rate of Return). Sengon (Parasienthes falcataria) menjadi tanaman pokok petani hutan rakyat di Desa Cikalong. Pengelolaan hutan rakyat meliputi persiapan lahan, penyediaan bibit, penanaman dan pemeliharaan. Dalam pembentukan unit pengelolaan hutan rakyat menggunakan model yang terdiri dari 5 (lima) sub model. Daur yang digunakan dalam model ini adalah 5 tahun. Hasil simulasi model dapat menyerap tenaga kerja sebanyak 10 orang per Ha dan luasan efektif yang diperoleh sebesar 2.800 Ha. Selanjutnya untuk mengetahui kelayakan usaha hutan rakyat dilakukan perhitungan analisis finansial. Nilai NPV (Net Present Value) sebesar Rp 53.413.225.211. Nilai BCR (Benefit Cost Ratio) sebesar 1,2. Nilai IRR (Internal Rate Ratio) sebesar 32,6%.
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Judul: Sistem Pengelolaan Hutan Rakyat Jenis Sengon (Paraserianthes falcataria (L) Nielsen) di Desa Burat, Kecamatan Kepil, Kabupaten Wonosobo
Abstrak: Forest is one of renewable resources. The goal of forest management and forest utilization is to increase society welfare without aside it’s sustainable aspect. In fact, there are several things that supposed to be maximal on forest management, especially in community forest. Community forest has simple management it also has diversity on geographical place and treatment from its land holder. With several ways on developing community forest and also more intensive community forest management with sustainable ways together with support capability from community forest resources potency, exertion activity , environmental dynamics and the other factors are expected to form community forest as a certain business strategic that capable to maintain sustainable production and utilization that also put forest sustainable as priority. This research main objective is to learn community forest management and tabulate systemization of sustainable production planning of community forest at Burat Village, Kepil Sub-District, Wonosobo Regency, Central Java. Data taken in this research includes primary data from direct interview to land holder as producer, merchant, craftsman industry and timber industry. Secondary data taken from Forestry Department of Wonosobo Regency, Kepil Sub-District office, Burat Village office and internet browsing. Analysis method that use in this research are qualitative analysis for secondary data based on interview result and quantitative analysis for sengon species potency as primary data that taken based on simple sampling technique. Burat Village community forest has a simple management; it is proven by phases of utilization activity including planting, cultivation, harvesting, and marketing that haven’t follow the same pattern of management activity. This is occurring by ineffective management information that implement to all land holders at Burat community forest. There’s also misdistribution on supporting factors such as facility and infrastructure in Burat Village community forest. Institutional system and policy also cannot deliver utmost support for development of Burat Village sengon community forest management. Rotation on every sub-village is determined by range of rotation on existing condition; there are two different rotations which is 6 years rotation (Geger Jeruk and Krungsung sub village) and 7 years rotation (Burat, Kalibarong, Kalinongko, Kaliwang and Krajan sub village). Sustainability concept for every sub village that implemented 6 years rotation is range 1069 – 1118 trees/ha that can be harvest or replant, 3 years period 535 – 559 trees/ha, 1 year period 1178 – 186 trees/ha, 6 months period 89 – 93 trees/ha and for 3 months period 45 – 47 trees/ha. Sustainability concept for every sub village that implemented 7 years rotation is range 226 – 893 trees/ha that can be harvest or replant, 3 years period 97 – 383 trees/ha, 1 year period 32 – 128 trees/ha, 6 months period 16 – 64 trees/ha and for 3 months period 8 – 32 trees/ha.
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Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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