Judul: Peningkatan Produktivitas Daging Rajungan Kaleng di PT Kelola Mina Laut Cikande dengan Pareto
Abstrak: PT Kelola Mina Laut Cikande is a canned blue swimming crab meat processing company. The need to improve productivity at the factory underpins this research. Instances of productivity decline are attributed to various factors such as input variations from the miniplant, suboptimal processing, and inadequate handling of fishermen. The research methodology involves primary data collection through direct field observations, interviews with workers and management, and secondary data analysis from company reports. The Pareto method is employed to identify influential factors affecting product yield. The Pareto 80-20 approach reveals defects affecting final products at the miniplant, specifically texture, while shell and texture at the plant. Key factors influencing productivity include crab input quality, worker skills in sorting processes, and temporary storage conditions. Analysis continues with the Five Why method to uncover root causes. The study formulates strategies such as stricter monitoring of sorting activities and selecting more enclosed temporary crab storage before picking processes. Implementation of Pareto analysis-derived recommendations aims to enhance productivity, supporting sustainability and competitiveness in the global market for the company. Furthermore, it aims to contribute positively to Indonesia
Keyword: productivity, sustainability, analysis, blue swimming crab, pareto

Judul: Increasing the Efficiency of the Crab Production Process at Kelola Mina Laut Cikande Co. Using Lean Manufacturing Approach
Abstrak: PT Kelola Mina Laut (KML) merupakan perusahaan pengolah daging rajungan pasteurisasi dalam kaleng yang dalam proses produksinya melibatkan berbagai pihak mulai dari nelayan, pengepul, miniplant, plant, ekspedisi, retail, hingga akhirnya produk sampai ke konsumen akhir. Untuk meningkatkan efisiensi proses produksi, PT KML perlu meminimalkan pemborosan dalam proses produksinya, yang merupakan implementasi dari lean manufacturing. Analisis dilakukan dengan metode value stream mapping (VSM), menghasilkan peta kondisi saat ini dengan total waktu proses produksi di miniplant sekitar 11,09 jam dan 13,95 jam di plant. Analisis lebih lanjut menggunakan process activity mapping mengidentifikasi aktivitas pemborosan yang kemudian dianalisis menggunakan fishbone diagram untuk menemukan akar masalah. Solusi perbaikan dirancang berdasarkan prinsip lean 5S, yang kemudian menghasilkan future state map dengan total waktu produksi di miniplant sekitar 9,45 jam dan 12,21 jam di plant. Perbaikan tersebut meningkatkan process cycle efficiency di miniplant sebesar 6,09% dan di plant sebesar 4,96%. Dengan meminimalkan lead time, PT KML dapat memastikan produk rajungan sampai ke konsumen dengan cepat dan dalam kondisi terbaik, sehingga mempertahankan daya saing di pasar internasional., Kelola Mina Laut (KML) Co. is a company that processes pasteurized crab meat in cans whose production process involves various parties ranging from fishermen, collectors, miniplants, plants, expeditions, retailers, until finally the product reaches the final consumer. To increase the efficiency of the production process, KML Co. needs to minimize waste in its production process, which is an implementation of lean manufacturing. The analysis was carried out using the value stream mapping (VSM) method, producing a map of current conditions with a total production process time at the miniplant of around 11,09 hours and 13,95 hours at the plant. Further analysis using process activity mapping identifies waste activities which are then analyzed using a fishbone diagram to find the root of the problem. The improvement solution was designed based on lean 5S principles, which then produced a future state map with a total production time at the miniplant of around 9,45 hours and 12,21 hours at the plant. These improvements increased process cycle efficiency in the miniplant by 6,09% and in the plant by 4,96%. By minimizing lead time, KML Co. can ensure that crab products reach consumers quickly and in the best condition, thereby maintaining competitiveness in the international market.
Keyword: Lean Manufacturing, rajungan, Value Stream Mapping, Lead Time, Prinsip Lean 5S

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.
Keyword: