Judul: Inventory Management Analysis of Durian Monthong Palu at XYZ Co.
Abstrak: PT XYZ merupakan perusahaan distributor buah impor dan lokal salah satunya durian monthong palu. Sistem pengiriman durian menggunakan pendekatan push, dimana pengiriman dilakukan saat stok cukup untuk mengisi satu kontainer, ditambah ketidakpastian dalam jadwal dan jumlah pengiriman dari Palu. Diperlukan identifikasi dalam mengatasi masalah manajemen persediaan dan analisis yang akan membantu dalam mengembangkan strategi untuk mengelola persediaan durian monthong palu. Dalam penelitian ini menggunakan model economic order quantity (EOQ) dan perhitungan safety stock untuk menentukan jumlah pemesanan dan cadangan optimal. Menggunakan data historis yang kemudian dianalisis untuk mendapatkan pemahaman yang mendalam tentang pola permintaan dan variabilitasnya. Hasil penelitian menunjukkan bahwa idealnya perusahaan melakukan pemesanan sebanyak satu kontainer dalam sekali pemesanan atau pengiriman dengan frekuensi delapan kali pengiriman dalam setahun dan PT XYZ perlu mempersiapkan safety stock atau stok pengaman sebesar 12.262 unit. Dengan implementasi strategi yang tepat perusahaan dapat mengelola persediaan lebih baik dan mengurangi biaya operasioanl secara kesuluruhan., XYZ Co. is a distributor of imported and local fruits, including durian monthong palu. The durian delivery system uses a push approach, where shipments are made when there is enough stock to fill one container. Given the uncertainty in the schedule and quantity of shipments from Palu, it is necessary to identify and address inventory management issues and develop strategies to manage durian monthong inventory effectively. This research uses the economic order quantity (EOQ) model and safety stock calculations to determine the optimal order quantity and reserve levels. Historical data is analyzed to gain a deep understanding of demand patterns and variability. The results indicate that the ideal order quantity is one container per shipment, with a frequency of eight shipments per year. XYZ Co. also needs to prepare a safety stock of 12.262 units. By implementing the right strategies, the company can manage its inventory more effectively and reduce overall operational costs.
Keyword: safety stock, economic order quantity, Durian monthong palu, inventory management

Judul: Analisis Kinerja Rantai Pasok Durian Monthong Palu di PT XYZ
Abstrak: Durian monthong palu has captivated durian enthusiasts worldwide due to its potential and competitive business, especially for XYZ Co. as one of the distributor company in Indonesia. Despite its appeal, the special characteristics of durian monthong palu pose challenges for export markets. This study examines the supply chain of durian monthong palu and its performance score in XYZ Co. A combination of the supply chain operations reference (SCOR) model and analytical hierarchy process (AHP) method are employed in the analysis of the supply chain performance. The analysis concluded nine performance metrics along with the weight values indicating its importance level in determining the supply chain performance, and the performance scores of 89.23% or categorized as good for the packing house and 53.86% or categorized as average for XYZ Co. as the distributor. These results indicate areas for improvement in the supply chain, enabling datadriven decisions for success in the competitive durian export market., Durian monthong palu telah memikat para pecinta durian di seluruh dunia karena potensi dan peluang bisnisnya yang besar, terutama bagi PT XYZ sebagai salah satu perusahaan distributor di Indonesia. Namun, karakteristik khusus durian monthong palu menjadi tantangan tersendiri untuk pasar ekspor. Penelitian ini bertujuan untuk menganalisis rantai pasok durian monthong palu dan kinerja perusahaan XYZ Co. di dalamnya. Model supply chain operations reference (SCOR) dan metode analytical hierarchy process (AHP) digunakan untuk menganalisis kinerja rantai pasok. Analisis ini mengidentifikasi sembilan metrik kinerja beserta nilai bobotnya yang menunjukkan tingkat kepentingan tiap metrik dalam menentukan kinerja rantai pasok. Analisis pengukuran kinerja rantai pasok menunjukkan nilai kinerja sebesar 89,23% atau dapat dikategorikan sebagai baik untuk packing house dan 53,86% atau dapat dikategorikan sebagai rata-rata untuk PT XYZ sebagai distributor. Hasil ini menunjukkan adanya bagian yang perlu ditingkatkan dalam rantai pasok. Dengan demikian, PT XYZ dapat mengambil keputusan berbasis data untuk mencapai kesuksesan di pasar ekspor durian yang kompetitif.
Keyword: Durian monthong palu, analytical hierarchy process, supply chain operations reference, supply chain performance, kinerja rantai pasok

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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