Judul: Simulation Model of Forest Land use in BKPH Parungpanjang KPH Bogor
Abstrak: Perhutani sebagai Badan Usaha Milik Negara (BUMN) di bidang kehutanan memiliki visi dan misi yaitu menjadi pengelola hutan lestari guna menghasilkan keuntungan untuk menjamin pertumbuhan perusahaan berkelanjutan. BKPH Parungpanjang memiliki Luas 5.365,24 ha yang terdiri dari 3 RPH yaitu Tenjo, Maribaya, jagabaya. Masih terdapat banyak lahan kosong di daerah BKPH Parungpanjang dengan pengelolaan yang belum optimal. Agroforestri merupakan salah satu bentuk penggunaan lahan secara multitajuk yang terdiri dari campuran pepohonan, semak dengan atau tanaman semusim. Tujuan penelitian ini yaitu untuk menganalisis dan menyusun model simulasi dalam pengelolaan potensi tegakan di BKPH Parungpanjang dengan tanaman agroforestri dan menentukan skenario terbaik yang dapat meningkatkan pendapatan perum perhutani serta masyarakat yang terlibat. Dalam penyusunan model simulasi dilakukan identifikasi isu, tujuan, dan Batasan, konseptualisasi model, spesifikasi model, evaluasi model, serta penggunaan model. Selanjutnya dilakukan analisis kelayakan usaha berdasarkan kriteria Net Present Value (NPV) dan Benefit Cost Ratio (BCR) menggunakan aplikasi Stella 9.02. Isu dan perumusan masalah yang diangkat dalam pemodelan simulasi ini yaitu untuk meningkatkan pendapatan BKPH Parungpanjang dalam memanfaatkan lahan hutan dengan mengembangkan sistem Agroforestri. Tujuan dari penyusunan model simulasi ini adalah untuk mendapatkan model simulasi terbaik berdasarkan nilai NPV dan BCR melalui skenario yang telah dibuat. Skenario terbaik untuk dapat dikelola oleh BKPH Parungpanjang yang bekerjasama dengan masyarakat sekitar hutan adalah skenario 4 yaitu perusahaan mengelola usaha HHK berupa kayu Jati Plus Perhutani ditambah dengan pengelolaan agroforestri Jambu Kristal, dan Pepaya California. Pendapatan BKPH Parungpanjang dengan skenario 4 memiliki nilai NPV tertinggi yaitu sebesar Rp 255.392.948.371 dan BCR sebesar 2,10 dengan suku bunga Bank Negara Indonesia (BNI) sebesar 8,25% selama jangka simulasi yaitu sepuluh tahun., Perhutani, as a State-Owned Enterprise (BUMN) in the forestry sector, has a vision and mission: to become a sustainable forest manager in order to generate profits and ensure sustainable company growth. BKPH Parungpanjang has an area of 5,365.24 hectares, consisting of 3 RPHs namely Tenjo, Maribaya, and Jagabaya. There are still many vacant lands in the Parungpanjang BKPH area that are managed sub-optimally. Agroforestry is a form of land use that involves a combination of trees, shrubs, and annual crops. The purpose of this research is to analyze and develop a simulation model for managing potential stands at BKPH Parungpanjang using agroforestry plants and determining the best scenario to increase the income of Perum Perhutani and the people involved. During the preparation of the simulation model, the identification of issues, objectives, and limitations, conceptualization of the model, specification of the model, evaluation of the model, and utilization of the model are carried out. Furthermore, a business feasibility analysis was conducted based on the criteria of Net Present Value (NPV) and Benefit Cost Ratio (BCR) using the Stella 9.02 application. The main issue and problem formulation in this simulation modeling is to increase the income of BKPH Parungpanjang by utilizing forest land through the development of an agroforestry system. The purpose of developing this simulation model is to obtain the best simulation model based on NPV and BCR values from the created scenarios. The best scenario to be managed by BKPH Parungpanjang in collaboration with the communities around the forest
Keyword: agroforestry, simulation model, NPV, BCR, Stella

Judul: Model Simulasi Pengelolaan Hutan di KPH Bandung Utara Perum Perhutani Unit III Provinsi Jawa Barat
Abstrak: Perum Perhutani a State-Owned Enterprises (SOEs) operating in the forestry sector, Perum Perhutani manages state assets in the form of Protected Forest (PtF), Producted Forest (PdF), or Limited Producted Forest (LPF). Kesatuan Pemangku Hutan Bandung Utara (KPH BDU) is part of Perum Perhutani and duty to manage the forests in the KPH BDU area. In managing forests, KPH BDU seeks to synergize the elements of economic, social, and environmental. However, its implementation has not been achieved economic sustainability, KPH BDU in the last three years (2009 - 2011) was a loss in the balance sheet. With the condition of the majority of forest status status is certainly achieving sustainable economic PF challenged, given the commodity Perum Perhutani generally is wood. As a business entity, KPH BDU would seek to make a surplus in its balance sheet in order to achieve economic sustainability. Various ways have been done KPH BDU in order to achieve economic sustainability, including making nonwood forest products (NTFPs) as a commodity to be managed. This study aims to create a simulation model of forest management by KPH BDU, the model simulated in order to provide the best recommendations related to the management of forest commodities in the majority of the forest area protected status. In making the necessary simulation model Stella modeling software version 9.02 and Microsoft Excel 2007, the data are analyzed for the formulation of a conceptual model is intended to obtain forest management model. Once the model is developed quantitative model specification needs to be done to put the equation into a quantitative model. Evaluation model to assess the reasonableness of the model when the parameters changed in the extreme. Certain scenarios can be created in the final process modeling is the use of the model. Based on the results of research known commodity that will provide a positive impact on the economic sustainability of northern Bandung KPH is environmental services, agro-forestry, and non-essential businesses. While commodities are negatively impacted wood and sap pine (Pinus merkusii Jungh.). The best case scenario in managing forest commodities is to use timber and nontimber forest scenario option that gives surplus on the balance sheet.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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