Judul: Maksimisasi Keuntungan Melalui Kombinasi Produk Olahan Pisang Cv Al Barik
Abstrak: Kapasitas bahan baku dan sumber daya terbatas yang dimiliki perusahaan menjadi kendala dalam menentukan jumlah setiap jenis produk agar dapat dimanfaatkan secara optimal untuk mendapatkan keuntungan maksimal. Penelitian ini dilakukan untuk menganalisis maksimisasi keuntungan melalui kombinasi produk olahan pisang CV Al Barik yang berada di Bantul, Yogyakarta. Metode pemrograman linier digunakan untuk menghasilkan kombinasi produk optimal berdasarkan keterbatasan sumber daya yang dimiliki perusahaan, yaitu bahan baku, jam tenaga kerja dan jam mesin produksi, dengan bantuan software LINDO untuk penentuan keuntungan maksimal. Keuntungan maksimal yang diperoleh selama dua belas periode produksi sebesar Rp391 855 700 dengan memproduksi jenis produk kerupuk pisang dan keripik bonggol pisang.
Keyword: Keuntungan Maksimal, Kombinasi Produk, Pemrograman Linier

Judul: Analisis Optimalisasi Kombinasi Produksi Tahu Mentah Di Cv Laksana Mandiri Bogor
Abstrak: Tahu menjadi salah satu makanan yang banyak digemari oleh masyarakat Indonesia. Tahu merupakan salah satu produk dari komoditas usaha kecil menengah berbahan baku kedelai yang banyak dijumpai di beberapa daerah, mulai dari perkotaan sampai di pedesaan. Tujuan dilakukannya penelitian ini antara lain untuk mengetahui alokasi sumberdaya dan faktor kendala aktual yang dimiliki oleh CV Laksana Mandiri serta menganalisa kondisi optimal untuk memaksimalkan keuntungan. Data yang digunakan yaitu data primer antara lain wawancara dan observasi langsung, sedangkan data sekunder yang digunakan meliputi gambaran umum perusahaan, penggunaan sumberdaya, data produksi dan data penjualan. Penelitian ini menggunakan linear programming dengan software Production and Operation Management (POM) for Windows 3 dan menggunakan analisis primal, dual dan sensitivitas. Hasil analisis keuntungan pada kondisi aktual dan optimal memiliki selisih cukup besar, yakni Rp18.144.000 per tahun atau dapat meningkatkan keuntungan sebesar 6,72%.
Keyword: optimalisasi, pemrograman linier, tahu

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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