Judul: Analisis Pengendalian Persediaan Bahan Baku Kebab Original Pada stockist PT Kebab Turki Baba Rafi Cabang Bogor.
Abstrak: Kebab Turki Baba Rafi is one of the frenchise with high usage of raw materials. The raw materials used must always be fresh and maintained its quality to increase the order for every day. Therefore , its necessary the optimal inventories control to improve profit and efficiency cost every year. The purpose of this study is to analys the inventory control’s system in PT Kebab Turki Baba Rafi, knowing the optimal of inventory control in raws material at PT Kebab Turki Baba Rafi using analysis ABC, determines the the value of total inventory efficiency cost using Economic Order Quantity (EOQ) at PT Kebab Turki Baba Rafi. From the ABC analysis results, Original Kebab has 2 raw material with high usage value, its daging 4kg and tortilla besar (torbes). Comparison of the results of total cost of inventory, company using in savings obtained EOQ calculations Rp 208.600 per year for daging 4kg and tortilla besar has obtain the amount of savings as much as Rp 1.100 per year. Then the total saving obtained by the company as much as rp.209.700 during per year.
Keyword: Kebab Turki Baba Rafi, EOQ Methods, ABC Analysis

Judul: Analysis of Beverage Inventory Control at PT XYZ Dramaga, Bogor Regency
Abstrak: Pertumbuhan pasar teh dan boba di Indonesia sedang mengalami pertumbuhan yang cepat. Salah satu merk teh dan boba yaitu PT XYZ yang memiliki cabang di Dramaga. Saat ini cabang tersebut mengalami kendala dalam mengelola persediaan karena permintaan yang fluktuatif tiap bulannya. Fokus pada penelitian ini adalah mengelola persediaan dari Choco Lava Milo dan Mango Yakult karena permintaannya yang cukup tinggi. Tahap awal dilakukan peramalan sebagai dasar untuk mengendalikan persediaan. Perhitungan persediaan dilakukan dengan Economic Order Quantity (EOQ). Metode peramalan yang dipilih adalah trend analysis karena tingkat kesalahannya terkecil. Berdasarkan hasil EOQ, kuantitas pemesanan optimum untuk Choco Lava Milo sebanyak 241 cup dan Mango Yakult sebanyak 244 cup. Total biaya persediaan yang dikeluarkan dengan EOQ adalah Rp3.367.898 sehingga gerai dapat menghemat biaya sebesar Rp 399.664 per tahun., The growth of the tea and boba market in Indonesia is experiencing rapid growth. One of the tea and boba brands is PT XYZ which has a branch in Dramaga. Currently, the branch is experiencing problems in managing inventory due to fluctuating demand every month. The focus of this research is managing the supply of Choco Lava Milo and Mango Yakult because demand is quite high. The initial stage is forecasting as a basis for controlling inventory. Inventory calculations are carried out using Economic Order Quantity (EOQ). The forecasting method chosen is trend analysis because the error rate is the smallest. Based on the EOQ results, the optimum order quantity for Choco Lava Milo is 241 cups and Mango Yakult is 244 cups. The total inventory costs incurred with EOQ are IDR 3.367.898 so the outlet can save costs of IDR 399.664 per year.
Keyword: Demand forecasting,, inventory control, EOQ, safety stock, Reorder Point

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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