Judul: Optimasi Penjadwalan Produksi Sayuran Organik (Studi Kasus di PT Kebun Sayur Segar, Bogor)
Abstrak: PT Kebun Sayur Segar merupakan salah satu produsen sayuran organik terbesar di Jabodetabek. Salah satu permasalahan yang terjadi dalam industri tanaman di perusahaan ini adalah produksi tanaman yang kurang sesuai dengan permintaan pasar. Tujuan penelitian ini adalah melakukan optimasi penjadwalan produksi sayuran organik melalui pemodelan permintaan pasar untuk komoditas caisim, pakchoy, selada, bayam, kangkung dan jagung muda. Pemodelan dilakukan dengan metode statistik deret waktu ARIMA (Autoregressive Integrated Moving Average). Model yang ditetapkan dalam penelitian ini yaitu model ARIMA (1,0,1) untuk caisim, ARIMA (1,0,0) untuk pakchoy, ARIMA (0,0,1) untuk selada, ARIMA (0,1,1) untuk bayam, ARIMA (2,1,3) untuk kangkung dan jagung muda. Model-model tersebut digunakan untuk peramalan sebagai rekomendasi perusahaan dalam merencanakan produksi satu periode tanam ke depan., PT Kebun Sayur Segar is one of the largest producer of organic vegetables in Jabodetabek. One of the problems that occur in the company is unappropriate crop production according to market demand. The purpose of this study is to optimize the production scheduling of organic vegetables through modeling the market demand for commodities caisim, pakchoy, lettuce, spinach, kale and sweet corn. Modeling is done by the statistical method of time series ARIMA (Autoregressive Integrated Moving Average). The models decided in this research are ARIMA (1,0,1) for caisim, ARIMA (1,0,0) for pakchoy, ARIMA (0,0,1) for lettuce, ARIMA (0,1,1) for the spinach, ARIMA (2,1,3) for kale and sweet corn. The models will used in forecasting as company recommendations in planning the production for the next planting period.
Keyword: ARIMA, deret waktu, PT. Kebun Sayur Segar, peramalan, sayuran organik

Judul: Hydroponic vegetable production planning at pt. Kebun sayur segar (parung farm), bogor, west java
Abstrak: Seiring meningkatnya kesadaran dan kepedulian masyarakat terhadap kesehatan, sayuran kini menjadi alternatif pilihan dalam pola konsumsi masyarakat Indonesia. Pertumbuhan konsumsi sayuran pada tahun 2008 hingga 2011 mengalami penurunan, namun pada tahun 2012 pertumbuhan bernilai positif. Hal tersebut berarti bahwa ada kecenderungan perubahan dalam tingkat konsumsi sayuran masyarakat Indonesia yang akan berimplikasi pada peramalan permintaan dan perencanaan produksi yang akan dilakukan oleh suatu perusahaan. Salah satu perusahaan yang bergerak di bidang agribisnis ialah PT. Kebun Sayur Segar (Parung Farm) yang memproduksi beberapa sayuran hidroponik, seperti bayam hijau, kangkung, romaine dan sebagainya. Berdasarkan hasil ramalan untuk lima bulan kedepan, permintaan bayam hijau berkisar antara 300 hingga 400 pak perhari, permintaan kangkung berkisar antara 220 hingga 270 pak perhari, dan permintaan romaine berkisar antara 100 hingga 148 pak perhari. Puncak permintaan ketiga komoditi terjadi pada hari-hari akhir di bulan Juli 2014, yakni tanggal 24 dan 25 Juli 2014. Jika ditarik mundur dari tanggal tersebut, maka secara umum berdasarkan karakteristik masing-masing komoditi, perencanaan produksi akan dimulai pada bulan Juni 2014 dengan memperhatikan masa N1, N2 serta N3 dari masing-masing komoditi., By increasing awareness and public awareness of the health, now vegetables is as alternative patterns of consumption in Indonesia. Vegetables consumption growth in 2008 and 2011 has decreased, but in 2012 growth is positive. This means that there is a trend of change in the rate of Indonesian society vegetables consumption which will have implications for demand forecasting and production planning will be done by a company. One of the agribusiness companies is PT. Kebun Sayur Segar (Parung Farm) which produces some hydroponic vegetables, such as green spinach, kale, romaine, and so on. Based on the results of the forecast for the next five months, demand for green spinach ranged from 300 to 400 packs per day, demand kale ranged from 220 to 270 packs per day, and romaine demand ranged from 100 to 148 packs per day. Peak demand occurs in the third commodity these days in the month end of July 2014, which is dated 24 and 25 July 2014. If pulled backwards from that date, it is generally based on the characteristics of each commodity, production planning will begin in June 2014 with regard period N1, N2 and N3 of each commodity.
Keyword: hidroponik, Parung Farm, peramalan, perencanaan produksi

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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