Judul: Pengaruh Kenaikan Harga Kedelai terhadap Profitabilitas dan Nilai Tambah Usaha Tahu Bandung Kayun-Yun di Desa Cihideung Hilir Kecamatan Ciampea Kabupaten Bogor
Abstrak: Small industries is part of SME (Small Medium Enterprise) sector that gives an important role in Indonesia’s economic development. One of small industry that potentially to be developed is soybean industries such as tofu industries. Soybean price increase that occurred in 2013 affects tofu small industrial especially Usaha tahu bandung Kayun-Yun. The purpose of this research was to analyze the effect of soybean price increase on profitability and added value of Usaha Tahu Bandung Kayun-Yun. Research location was selected with the considerations that Ciampea subdistricts is one of the all subdistricts in Bogor district that known as tofu production centers. The results showed after soybean prices increased, the total cost increased by 44 957 794 per month, sales volume is still in 6700 pieces per day, the difference in cost of production in the amount of Rp 206/piece for 4 cm tofu and Rp 254/piece for 5 cm tofu, break-even point in goods value for 4 cm tofu in the amount of 586 pieces with 175 873 rupiah IDR and for 5 cm in the amount of 330 pieces with 115 557 rupiah IDR. Profitability value showed an increase of 30.25 % for 4 cm and 29.36 % for 5 cm tofu. The result of the added value also increased by Rp 8 672/kg for 4 cm tofu and Rp 8 195/kilogram for 5 cm tofu.
Keyword: added value., profitability, Usaha tahu bandung Kayun-Yun, Soybean

Judul: Analisis Kelayakan Usaha Tahu Bandung Kayun-Yun Desa Cihideung Ilir Kecamatan Ciampea Kabupaten Bogor
Abstrak: Usaha Tahu Bandung Kayun-Yun is one of the small soybean industries that uses soybean as the main material. Soybean price increased that occured in 2013 involved the business interruption. The purpose of this research was to analyze feasibility of financial and non financial aspects. Data analysis methods used are qualitative and quantitative. Qualitative data used to analyze non financial aspects (market, technical, management and legal, social and economic, and enviromental aspects). While, quantitative data used to analyze financial aspects through four investment criteria, that is NPV, IRR, Net B/C and payback period. The value of NPV obtained at Rp 293 316 530, Net B/C obtained at 3.07, IRR obtained at 39 persen, and payback period obtained five year seven months seventeen days. The results is both of the financial and non financial aspects showed that Usaha Tahu Bandung Kayun-Yun is feasible to run, except the management aspects because the bussiness does not have financial record keeping and environmental aspects because waste water allowed to flow directly into the river so that in long impact can cause environmental pollution. Sensitivity analysis showed that soybean price increased is more sensitive variable than the decrease in number of production of tofu.
Keyword: feasibility study, Usaha Tahu Bandung Kayun-Yun, Sensitivity analysis

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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