Judul: Pengembangan brownies kukus tepung ubi jalar(Ipomoea batatas L.) di PT.Fits Mandiri Bogor
Abstrak: Brownies adalah salah satu jenis cake yang berwarna cokelat kehitaman. Brownies ada dua macam yaitu brownies kukus dan brownies oven. Struktur brownies sama seperti cake yaitu ketika dipotong terlihat keseragaman pori renah, jika dimakan terasa lembut, lembab dan menghasilkan flavor yang baik (Sunaryo, 1985). Brownies mempunyai tekstur lebih keras daripada cake karena brownies tidak membutuhkan pengembangan gluten
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Judul: Optimalisasi Produksi Brownies Singkong pada Mr.BrownCo Bogor
Abstrak: Bogor city is one area that experiencing rapid development of UMKM . Mr.BrownCo is one of UMKM in Bogor that capture business opportunities with compared unique food product to other food business . Brownies Cassava is one kind of snack practical with excellent nutritional content and safe for consumption so make such products can provide value added to the company in addition to excellence in product diversification of raw materials . One of the goals to be achieved by the company is the optimal profit . To achieve the optimization of the profits of a company faced with the reality of limited resources. Optimal production plan obtained by using linear programming . The output of data processing by using LINDO will provide an optimal combination of products so that maximum benefit can be achieved . The output of the data processing that provide an optimal combination will be compared with the actual conditions that occur in the company and to evaluate whether the activities undertaken during this production is optimal or not . Based on the results of the optimization analysis can be seen that the rate of production of brownies in mr.BrownCo during August - November 2012 have not been optimal . This is because there are differences between the actual conditions with optimal conditions . Mr.BrownCo should produce up to optimal conditions in order to make a profit ( gross profit ) is maximum . Mr.BrownCo should set back the excess availability of resources such as raw materials , labor hours and machine hours.
Keyword: Linier Programming, Optimization, Cassava Brownies

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model