Judul: Economic Feasibility Analysis of Smallholder Dairy Farming
Abstrak: Desa Mundu, Kecamatan Tulung merupakan salah satu sentra peternakan sapi perah di Kabupaten Klaten. Keberadaan peternakan berimplikasi pada timbulnya limbah serta potensi pencemaran lingkungan akibat aktivitas peternakan. Peternakan sapi perah yang terdapat di desa ini yaitu peternakan sapi perah dengan biodigester dan tanpa biodigester. Penerapan konsep ekonomi sirkular menggunakan teknologi biodigester menghasilkan biogas, sludge, dan slurry yang meningkatkan manfaat usaha peternakan sapi perah serta dapat mengurangi timbulnya pencemaran lingkungan. Oleh karena itu, perlu dilakukan analisis kelayakan aspek non-finansial yang meliputi aspek teknis; sosial dan lingkungan; kelembagaan, institusional, manajerial; dan komersial usaha peternakan sapi perah biodigester dan non-biodigester di Desa Mundu. Analisis proyeksi kelayakan ekonomi kedua pilihan usaha ditinjau dari kriteria investasi NPV, IRR, Net B/C, dan payback period layak dijalankan. Namun, usaha peternakan sapi perah biodigester lebih unggul. Hasil analisis sensitivitas terhadap biaya perbaikan biodigester menunjukkan bahwa usaha peternakan biodigester layak dijalankan dan tidak mempengaruhi usaha secara signifikan. Analisis switching value menunjukkan penurunan harga jual susu berpengaruh sangat signifikan pada kedua pilihan usaha, sedangkan kenaikan harga konsentrat dan ampas tahu tidak berpengaruh secara signifikan terhadap keberlangsungan usaha., Mundu Village, Tulung District is one of the centers of dairy farming in Klaten Regency. The existence of farms has implications for the generation of waste and the potential for environmental pollution due to farming activities. Dairy farms in this village are dairy farms with biodigesters and without biodigesters. The application of the circular economy concept using biodigester technology produces biogas, sludge, and slurry which increases the benefits of dairy farming and can reduce the incidence of environmental pollution. Therefore, it is necessary to analyze the feasibility of non-financial aspects including technical; social and environmental; institutional, managerial; and commercial aspects of biodigester and non-biodigester dairy farming in Mundu Village. The analysis of economic feasibility projections of both business options in terms of NPV, IRR, Net B/C, and payback period investment criteria is feasible. However, the biodigester dairy farming business is superior. Sensitivity analysis of biodigester repair costs showed that biodigester farming is feasible and does not significantly affect the business. The switching value analysis shows that a decrease in the selling price of milk has a very significant effect on both business options, while an increase in the price of concentrate and tofu pulp does not significantly affect business sustainability.
Keyword: ekonomi sirkular, Switching Value, biogas, sensitivitas, slurry

Judul: Analisis Kelayakan Usahaternak Sapi Perah pada Alda Alya Dairy Farm di Kecamatan Tambun Selatan, Kabupaten Bekasi
Abstrak: The availability of national milk has not been able to meet the needs of milk, only about 21 persen in 2013. While existing market potential was quite large with the increasing number of population. Alda Alya Dairy Farm took that chance and opened dairy farming on 2007. However, the investments made in the business requires substantial capital investment and a long payback. Therefore,it was necessary to conduct research on the feasibility analysis of dairy cattle farming. The feasibility analysis of dairy farming conducted on the feasibility of financial and nonfinancial. Nonfinancial feasibility was done based on market aspects, technical aspects, management and legal aspects, and social, economic, and environmental aspects. While the financial feasibility was measured by investment criteria such as NPV, IRR, Net B/C, Gross B/C, and Payback Period. In addition, there was a switching value analysis on components of lower sales volume and an increase in feed costs. Based on the results of the analysis of both financial and nonfinancial feasibility, Alda Alya Dairy Farm is feasible to run.And based on switching value analysis Alda Alya Dairy Farm more sensitive to components of lower sales volume.
Keyword: milk., dairy cattle, farming, feasibility, investment

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
Keyword: