Judul: odels of Land Cover Change using Multi Layer Perceptron and Logistic Regression Methods in Gunung Ciremai National Park
Abstrak: Taman Nasional Gunung Ciremai (TNGC) merupakan salah satu kawasan pelestarian alam yang ada di Provinsi Jawa Barat. TNGC ditunjuk sebagai taman nasional berdasarkan Surat Keputusan Menteri Kehutanan No. 424/Menhut-II/2004 tanggal 19 Oktober 2004. Sebelum ditetapkan sebagai taman nasional, kawasan hutan Gunung Ciremai merupakan hutan lindung dan hutan produksi yang dikelola oleh Perum Perhutani. Dalam pengelolaan hutan produksi, Perum Perhutani mengembangkan sistem Pengelolaan Hutan Bersama Masyarakat (PHBM). Sistem ini memperbolehkan masyarakat untuk menggarap kawasan dengan pola tumpang sari. Pengelolaan dengan sistem ini sedikit banyak mempengaruhi tutupan lahan kawasan Gunung Ciremai. Perkembangan perubahan tutupan lahan suatu wilayah dapat diketahui dengan memanfaatkan data penginderaan jauh (remote sensing) berupa citra satelit multitemporal. Perkembangan perubahan tutupan lahan sangat penting untuk diketahui, agar pola perubahan tutupan lahan dimasa datang dapat diprediksi sehingga perubahan penutupan lahan yang bersifat negatif dapat dicegah atau dikurangi. Penelitian ini bertujuan untuk mengkaji perubahan penutupan lahan secara spasial di TNGC dari tahun 2000 sampai dengan tahun 2008 dan menyusun pemodelan perubahan penutupan lahan di TNGC pada tahun 2016 dengan metode Multi-layer Perceptron (MLP) dan Logistic Regression (Logit) berdasarkan perubahan penutupan lahan tahun 2000–2008. Metode pemodelan yang digunakan dalam penelitian ini adalah MLP dan Logit. Sedangkan variabel bebas yang dapat mendorong terjadinya perubahan penutupan lahan yang digunakan dalam penelitian ini adalah kemiringan lereng, jarak dari jalan, jarak dari pemukiman, dan kepadatan penduduk. Hasil penelitian menunjukkan bahwa perubahan penutupan lahan di kawasan TNGC yang terjadi pada periode 2000–2008 adalah adanya peningkatan luas penutupan lahan terbuka sebesar 898.87 ha. Hal ini diikuti dengan penurunan luas penutupan hutan pegunungan, hutan tanaman dan semak masing-masing sebesar 79.59 ha, 11.06 ha dan 808.22 ha. Sedangkan penutupan lahan yang tidak mengalami perubahan adalah badan air, hutan dataran rendah, hutan sub alpine dan kawah. Selama periode tahun 2008–2016 sebanyak 6 penutupan lahan tidak mengalami perubahan, antara lain badan air, hutan dataran rendah, hutan pegunungan, hutan sub alpine, hutan tanaman dan kawah. Penurunan dan peningkatan luas hanya terjadi pada penutupan lahan terbuka dan semak masing-masing sebesar 1907.91 ha. Hasil validasi antara peta prediksi penutupan lahan metode pemodelan MLP dan Logit dengan peta penutupan lahan aktual tahun 2016, diperoleh nilai akurasi sangat baik dengan nilai kappa untuk MLP sebesar 0.8995 dan untuk Logit sebesar 0.8989, sehingga model dapat diaplikasikan untuk prediksi penutupan lahan pada tahun-tahun yang akan datang., Gunung Ciremai National Park (TNGC) is one of the nature conservation area in West Java Province. TNGC is designated as a national park based on Ministry of Forestry Decree no. 424 / Menhut-II / 2004 dated October 19, 2004. Before being designated as a national park, the forest area of Mount Ciremai was protected forest and production forest managed by Perum Perhutani. In the management of production forests, Perum Perhutani developed a Collaborative Forest Management (PHBM) system. This system allows people to work on areas with intercropping patterns. This system of land management affects the land cover of Mount Ciremai area. The development of land cover change of a region can be known by utilizing remote sensing data in the form of multitemporal satellite imagery. The development of land cover change is important to know, so
Keyword: Land cover change, Multi layer perceptron, Logistic Regression, Forestry, Remote sensing data, Nature conservation

Judul: Analisis perubahan penggunaan/penutupan lahan di area cagar biosfer cibodas dalam mendukung keberadaan Taman Nasional Gunung Gede Pangrango
Abstrak: An increasing number of population caused land use/land cover change in Cibodas Biosphere Reserve. One of the approach to rapidly assess land use conversion is by using remote sensing technology. Therefore, the purposes of this study are : (1) to analyze land use/land cover change in 1999 and 2011 and the factor that affecting land use/land cover changes; (2) to identify people preference about land use/land cover change that can be tolerated; (3) predicting land use/land cover allocation approach with Cellular Automata (CA) and (4) to conduct controlling scenario land use/land cover changes in the Cibodas Biosphere Reserve that can support the sustainability of Mount Gede Pangrango National Park. The result showed the form of land use in 1999 was dominated by dry field and mixed farms, amounting to 44.25% and in 2011 the dominance of dry field and mixed farms was reduced to 38.16% accompanied with an increase in settlements from 16.19% to 20.41%. Based on AHP result, land use/land cover change is caused by population growth, source of income, slope, elevation and soil type. Land use/land cover change that can be tolerated by society is changing forests into dry field and mixed farms which have a value of 0.249 or 24.9%, and from dry field and mixed farms to residential with a value of 0.206 or 20.6%. Landuse prediction in 2023 show that dry field and mixed farm is 34,34 %, forest 30.97%, settlements 23.39%, fields 11.14%, edelweis 0.08%, grass / shrub 0.05% and 0.03% of water bodies. There is three scenarios to control land use/land cover change in Cibodas Biosphere Reserve
Keyword: 

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
Keyword: