Judul: Analisis Biaya dan Kelayakan Usaha Penggilingan Padi di Kecamatan Karanganyar, Kabupaten Pekalongan
Abstrak: Penggilingan padi adalah salah satu tahapan pascapanen yang tediri dari rangkaian beberapa proses untuk mengolah gabah menjadi beras siap konsumsi. Tujuan penelitian ini adalah untuk menganalisis biaya dan kelayakan usaha penggilingan padi, menganalisis sensitivitas biaya terhadap beberapa kondisi, dan membandingkan dua unit penggiligan padi. Analisis biaya berupa biaya tetap, biaya tidak tetap, biaya total, biaya pokok, dan titik impas. Kelayakan finansial ditentukan melalui kriteria Net Present Value (NPV), Internal Rate of Return (IRR), dan Benefit Cost Ratio. Hasil analisis menunjukkan bahwa penggilingan padi milik Bapak H. Sukadi (A) layak untuk dijalankan karena mempunyai NPV sebesar Rp 160,396,218.56, IRR sebesar 44.237%, dan B/C ratio sebesar 1.557 atau memenuhi syarat NPV > 0, IRR ≥ discount rate (7%), dan B/C ratio > 1. Penggilingan padi milik Bapak Marno (B) juga layak untuk dijalankan karena mempunyai NPV sebesar Rp 38,673,284.24, IRR sebesar 17.21%, dan B/C ratio sebesar 1.218 atau memenuhi syarat NPV > 0, IRR ≥ discount rate (7%), dan B/C ratio > 1.
Keyword: Benefit Cost Ratio, IRR, NPV, penggilingan padi

Judul: Analisis Biaya dan Kelayakan Usaha Penggilingan Padi di Kelurahan Situ Gede, Kecamatan Bogor Barat.
Abstrak: One important aspect of post-harvest handling of rice is rice milling. Although many rice milling unit, but deployment and their feasibility has not so optimal.This situation requires an evaluation and needs analysis to assess the optimum level making it feasible to operate profitably. The research objective is to create a cost analysis and feasibility of rice mills and to make sensitivity analysis on several conditions. The study was conducted for 3 months, from May 2010 until July 2010. Using Mr Kardi’s rice milling unit as an objects for the research where located at Situ Gede Village in West Bogor. Based on the calculation of the cost analysis, obtained total cost rice mill for a year is Rp. 37,033,093.194. Main cost produced per kilogram of rice at Rp. 283.8. Breakeven point values obtained for rice mills is 139.19hours / year or 35,342.784 kg of paddy / year. In addition, based on sensitivity analysis, obtained value net present value (NPV) is Rp. 168,628,529.933, the internal rate of return (IRR) is 40.11, and the gross value of B / C ratio is 1.50. Based on that results, we can conclude Kardi’s rice mill unit is feasible to run. After that, a sensitivity analysis was performed on several conditions that may occur. The selected conditions is rising diesel fuel prices, rising labor wage, and decrease the amount of annual milled. After calculating the sensitivity analysis, obtained some conditions which may cause the rice mill is not feasible to run.
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Judul: Comparison of HIV Model with and without Time Delay
Abstrak: Acquired immunodeficiency syndrome (AIDS) is the reduction of the human immune system. AIDS is caused by human immunodeficiency virus (HIV). No medicine has been found for this desease until recently. An AIDS therapy is usually performed with highly active antiretroviral therapy, namely reverse transcriptase inhibitors, protease inhibitors and combination of both. Various models have been developed to explain the immune system of patients with AIDS, namely the HIV, response and the time delay model. This paper discusses the comparison between the dynamics of the HIV virus, the dynamic response of protease inhibitors and dynamics of time delay. The dynamics model of HIV is influenced by the level of white blood cells produced and the rate of its death. Dynamics of protease inhibitors on the response and the time delay model is influenced by the death rate of infected white blood cells and the failure rate of treatment.
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