Judul: Rancang Bangun Aplikasi Kelayakan Usaha Produk Turunan Ubi Jalar Berbasis Android
Abstrak: Produk pertanian yang memiliki luas panen tertinggi di Kecamatan Dramaga adalah ubi jalar. Ubi jalar telah diproduksi menjadi beberapa produk turunan, yaitu muffin ubi jalar, brownies ubi jalar, dan keripik daun ubi jalar. Salah satu permasalahan yang ada adalah belum dilakukannya analisis finansial usaha oleh para pelaku usaha mikro kecil (UMK) produk turunan ubi jalar karena kurangnya pengetahuan pelaku UMK terhadap pentingnya analisis finansial usaha. Tujuan penelitian ini adalah membangun aplikasi kelayakan finansial usaha produk turunan ubi jalar berbasis Android yang dapat membantu pelaku UMK produk turunan ubi jalar dalam melakukan analisis finansial usaha. Alat dan bahan yang digunakan dalam penelitian adalah laptop, telpon seluler, Java Development Kit, Android Studio, DB Browser, Microsoft Excel, dan Google Chrome. Metode penelitian mengacu pada metode System Developmet Life Cycle yang terdiri dari investigasi sistem, analisis sistem, desain sistem aplikasi, implementasi sistem aplikasi, dan pemeliharaan sistem aplikasi. Hasil penelitian adalah sebuah aplikasi yang dapat menghitung net present value, internal rate of return, payback period, biaya pokok produksi, memberikan informasi kelayakan usaha, dan saran untuk usaha. Tingkat error aplikasi sebesar 5.09%. Kata kunci : analisis finansial, pemrograman android, produk turunan ubi jalar, usaha mikro kecil, Agricultural product that has the highest harvested area in Dramaga is sweet potato. Sweet potato has been processed into various derivative products, such as sweet potato muffin, sweet potato brownies, and sweet potato leaf chips. One of the problems is the financial analysis has not been done by the micro small entrepreneurs of sweet potato derivative products because of their lack of knowledge about the importance of financial analysis calculation. The purpose of the research is to design the business financial analysis application for sweet potato products based on Android that can help the micro small entrepreneurs of sweet potato products to do business financial analysis of their businesses. Tools and materials that used in the research are laptop, mobile phone, Java Development Kit, Android Studio, DB Browser, Microsoft Excel, and Google Chrome. The research referred to the system development life cycle which consists of system investigation, system analysis, design of application system, and system maintenance. The result of the research is an application that can calculate net present value, internal rate of return, payback period, cost of good manufactured, feasibility information, and suggestions for the business. The error rate of the application is 5.09%. Key words : android programming, derivative products of sweet potato, financial analysis, micro small enterprise
Keyword: android programming, derivative products of sweet potato, financial analysis, micro small enterprise

Judul: Analysis of Technical Production and Income from Sweet Potato Farming in Bandorasa Wetan Village, Cilimus Sub-district, Kuningan Regency
Abstrak: Desa Bandorasa Wetan merupakan salah satu produsen ubi jalar terbesar di Kabupaten Kuningan yang juga menjadi sentra pengolahan ubi jalar. Persoalan yang dihadapi petani ubi jalar dalam mengelola usahatani adalah bagaimana mengalokasikan faktor-faktor produksi secara tepat agar dapat memaksimumkan produksi sehingga akan meningkatkan pendapatan. Oleh karena itu, tujuan dari penelitian ini yaitu untuk menganalisis usahatani ubi jalar di Desa Bandorasa Wetan yang berkaitan dengan (1) faktor-faktor yang memengaruhi produktivitas (2) efisiensi produksi (3) pendapatan petani (4) hubungan efisiensi teknis dan pendapatan petani. Metode yang digunakan dalam penelitian ini adalah regresi linear berganda dengan metode Maximum Likelihood Estimation (MLE), analisis efisiensi teknis dengan metode Stochastic Frontier Analysis (SFA), analisis pendapatan dengan menggunakan R/C ratio, serta analisis hubungan efisiensi teknis dan pendapatan dengan uji Rank Spearman. Hasil penelitian menunjukkan bahwa pupuk urea, pupuk phonska, dan pupuk TSP berpengaruh positif dan signifikan terhadap produksi ubi jalar. Nilai rata-rata efisiensi teknis adalah sebesar 0,91. Pendapatan usahatani ubi jalar lebih besar dari nol dan nilai R/C ratio lebih besar dari satu. Terdapat hubungan positif dan signifikan antara nilai efisiensi teknis dan pendapatan usahatani., Bandorasa Wetan Village is one of the largest sweet potato producers in Kuningan Regency and is also a sweet potato processing center. The problem faced by sweet potato farmers in managing their farming business is how to allocate production factors appropriately in order to maximize production so that it will increase income. Therefore, the aim of this research is to analyze sweet potato farming in Bandorasa Wetan Village in relation to (1) factors that influence productivity (2) production efficiency (3) farmer income (4) the relationship between technical efficiency and farmer income. The method used in this research is multiple linear regression using the Maximum Likelihood Estimation (MLE) method, technical efficiency analysis using the Stochastic Frontier Analysis (SFA) method, income analysis using the R/C ratio, and analysis of the correlation between technical efficiency and income using Rank Spearman test. The research results showed that urea fertilizer, TSP fertilizer, and labor had a positive and significant effect on sweet potato production. The average value of technical efficiency is 0,91. Sweet potato farming income is greater than zero and the R/C ratio value is greater than one. There is a positive and significant relationship between technical efficiency values and farming income.
Keyword: correlation, production factors, productitivy, profit, stochastic frontier

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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