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: Sistem Pengelolaan Hutan Rakyat Jenis Sengon (Paraserianthes falcataria (L) Nielsen) di Desa Burat, Kecamatan Kepil, Kabupaten Wonosobo, Propinsi Jawa Tengah.
Abstrak: Hutan merupakan sumberdaya alam yang dalam penggunaannya dapat dipulihkan kembali (renewable). Pemanfaatan dan pengelolaan hutan bertujuan untuk meningkatkan kesejahteraan masyarakat tanpa mengabaikan aspek kelestariannya. Dalam prakteknya di lapangan masih didapatkan beberapa hal yang dirasa kurang maksimal dalam pengelolaan hutan, khususnya hutan rakyat. Karena pengelolaannya masih sederhana dan sangat bervariasi berdasarkan letak geografis dan perlakuan dari pemilik lahan. Dengan adanya beberapa cara pengembangan hutan rakyat dan dengan lebih intensifnya pengelolaan dengan cara yang lebih sustainable dengan daya dukung potensi sumberdaya hutan rakyat, kinerja pengusahaan, dinamika lingkungan dan faktor-faktor lainnya diharapkan hutan rakyat dapat menjadi suatu unit bisnis startegis yang mampu mempertahankan keberlangsungan produksi dan pengusahaanya dengan tetap memprioritaskan kelestarian hutannya.
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Judul: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix