Judul: Analisis dan Desain Sistem Informasi Produksi dan Keamanan Pangan di PT XYZ, Analisis dan Desain Sistem Informasi Produksi dan Keamanan Pangan di PT XYZ
Abstrak: Beef consumption in Indonesia is only 34% compared to the world average. The main reason is the high price due to the long supply chain. As an importer and distributor of frozen food, PT XYZ provides meat at competitive prices. Production unit is a new unit that performs the process of cutting, milling, or repackaging to reach a broader range of consumers. The information system has not yet been formed, so it becomes an obstacle in product documentation and tracking. This study aims to analyze the production process flow, design information system components with its quality parameters, make system prototypes, implementation and evaluation system prototypes. Product definition is stable and system requirement is well-known hence, SDLC method and waterfall model are used. Black-box testing shows that the user can carry out all parts of the production information system appropriately. System implementation showed that the data access time increased from 5 minutes to 5 seconds, the data input time from 10 minutes to 4 minutes, and reports of production units that did not exist before became available. Exponential smoothing has highest accuracy compared to other forecasting method with 30.86 MSE value, 5.55 MAD value, and 90% accuracy.
Keyword: food safety, forecasting, information system

Judul: Implementation Cost Design of Meat Quality Monitoring  System Design and Smart Label at PT. XYZ
Abstrak: Distribusi daging yang efisien dan berkualitas tinggi sangat penting dalam industri pangan, namun sering menghadapi tantangan seperti kerusakan produk akibat perubahan suhu. Penelitian ini bertujuan untuk merancang dan menganalisis biaya implementasi sistem monitoring kualitas daging dan label pintar indikator temperatur di PT XYZ. Analisis ini dilakukan dengan merancang struktur biaya yang digunakan untuk menghitung harga pokok produksi per kg daging serta biaya implementasi dalam distribusi produk daging, dilakukan juga analisis sensitivitas dan validasi hasil menggunakan perangkat lunak MATLAB. Berdasarkan hasil analisis, diketahui bahwa implementasi sistem monitoring suhu dan kualitas serta label pintar indikator temperatur membutuhkan penambahan biaya sebesar 0.65% dari harga daging Rp. 120.000/kg. Analisis sensitivitas menunjukkan bahwa parameter kapasitas daging dan kenaikan biaya varibel sebesar 30% berpengaruh signifikan terhadap harga pokok produksi per kg daging. Validasi hasil menunjukkan hasil perhitungan yang sama dengan perhitungan menggunakan Ms. Excel. Implementasi sistem monitoring suhu dan kualitas serta label pintar indikator temperatur efektif dalam mengurangi permasalahan distribusi dan memberikan nilai tambah yang signifikan bagi perusahaan dalam hal pengendalian kualitas dan penghematan biaya jangka panjang., Efficient and high-quality meat distribution is essential in the food industry, but often faces challenges such as product damage due to temperature changes. This study aims to design and analyze the cost of implementing a meat quality monitoring system and temperature indicator smart label at PT XYZ. This analysis is carried out by designing a cost structure that is used to calculate the cost of production per kg of meat as well as implementation costs in the distribution of meat products, sensitivity analysis and validation of results using MATLAB software. Based on the results of the analysis, it is known that the implementation of a temperature and quality monitoring system and temperature indicator smart label requires an additional cost of 0.65% of the meat price of Rp. 120,000/kg. Sensitivity analysis shows that the meat capacity parameter and a 30% increase in variable costs have a significant effect on the cost of production per kg of meat. Validation of the results showed the same calculation results as the calculation using Ms. Excel. Meanwhile, the cost of loss due to product returns caused by temperature reaches an average of IDR 226,634,000 per month. The implementation of a temperature and quality monitoring system, along with smart labels that indicate temperature, effectively reduces distribution problems and provides significant added value to the company. This value is realized through improved quality control and long-term cost savings.
Keyword: Internet of Things (IoT), Implementation cost, Quality monitoring system, Smart label, Cost of loss return

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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