Judul: Risk Analysis and Mitigation of Cheese Product Supply  chain at PT XYZ
Abstrak: Keju merupakan produk olahan susu yang memiliki berbagai manfaat, keju dapat dijadikan sebagai campuran makanan dan dapat dijadikan snack yang sehat. Keju memiliki karakteristik yang berbeda dari bahan makanan lainnya sehingga penting bagi perusahaan untuk memperhatikan risiko selama rantai pasok agar produk tetap dalam kondisi yang baik hingga konsumen akhir. Penelitian ini dilakukan untuk menganalisis kondisi situasional rantai pasok, mengidentifikasi kejadian risiko, agen risiko serta aksi mitigasi risiko. Analisis situasional menggunakan metode Food Supply chain Network (FSCN), yang dikembangkan oleh Van der Vorst. HOR (House of risk) digunakan untuk menganalisis risiko yang dilakukan pada dua titik yaitu distributor dan retailer. Pada titik distributor dan retail berturut-turut teridentifikasi kejadian risiko dan agen risiko sebanyak 15 ,11 kejadian risiko dan 23, 15 agen risiko. Terdapat empat prioritas tindakan mitigasi pada tingkat distributor dan enam aksi mitigasi risiko di tingkat retail. Menurut para pakar, tindakan yang sebaiknya dilakukan yakni mengadakan pelatihan internal secara rutin untuk meningkatkan kompetensi tenaga kerja dan melakukan evaluasi penerapan SOP., Cheese is a processed dairy product that has various benefits, cheese can be used as a food mixture and can be used as a healthy snack. Cheese has different characteristics from other food ingredients, so it is important for companies to pay attention to risks throughout the supply chain so that the product remains in good condition until the final consumer. This research was conducted to analyze supply chain situational conditions, identify risk events, risk agents and risk mitigation actions. Situational analysis uses the Food Supply chain Network (FSCN) method developed by Van der Vorst. HOR (House of risk) is used to analyze risks that are carried out at two points, namely distributors and retailers. At the distributor and retail points, 15,11 risk events and 23,15 risk agents were identified respectively. There are four priority mitigation actions at the distributor level and six risk mitigation actions at the retail level. According to experts, the best course of action is to conduct regular internal training to improve workforce competence and evaluate the implementation of SOPs.
Keyword: cheese, HOR, mitigation, risk, supply chain

Judul: Analisis Kinerja dan Risiko Rantai Pasok Susu Formula (Studi Kasus: PT Tigaraksa Satria)
Abstrak: Industri produk olahan susu memiliki potensi besar untuk dikembangkan di Indonesia. Namun demikian, baik industri pengolahan maupun distributor masih menghadapi berbagai permasalahan terkait kinerja dan risiko. Penelitian ini bertujuan untuk menganalisis kinerja, risiko, serta menentukan strategi peningkatan kinerja rantai pasok susu formula di PT Tigaraksa Satria. Penelitian ini menggunakan metode supply chain operation reference (SCOR) yang diintegrasi dengan analytical hierarchy process (AHP) untuk analisis kinerja dan metode house of risk (HOR) untuk analisis risiko. Strategi peningkatan kinerja rantai pasok dirumuskan menggunakan metode analytical networking process (ANP) berdasarkan analisis benefit, opportunity, cost, dan risk (BOCR). Hasil pengukuran kinerja menunjukkan bahwa kinerja PT Tigaraksa Satria sudah sangat baik (97,61%). Hasil analisis risiko menunjukkan terdapat 13 risk agent pada tingkat prinsipal dan 18 risk agent pada tingkat distributor. Delapan risk agent ditetapkan sebagai prioritas untuk diberikan aksi mitigasi. Terdapat 8 aksi mitigasi yang dapat diterapkan pada tingkat prinsipal dan 11 aksi pada tingkat distributor. Aksi mitigasi diurutkan berdasarkan tingkat efektivitas dan kesulitan penerapannya. Berdasarkan penilaian pakar, peningkatan koordinasi dan kerja sama antar stakeholder merupakan strategi yang memiliki pengaruh besar terhadap peningkatan kinerja rantai pasok susu formula., The dairy product industry has excellent potential to be developed in Indonesia. However, both the processing industry and distributors still face various problems related to performance and risk. This study aims to analyze the performance, risks and determine strategies for improving the performance of the infant milk formula supply chain at PT Tigaraksa Satria. This study uses the supply chain operation reference (SCOR), which is integrated with the analytical hierarchy process (AHP) for performance analysis and the house of risk (HOR) method for risk analysis. The performance improvement strategy of a supply chain is formulated using the analytical networking process (ANP) based on benefit, opportunity, cost, and risk (BOCR) analysis. The performance measurement results show that the performance of PT Tigaraksa Satria is excellent (97.61%). The results of the risk analysis identified 13 risk agents at the producer level and 18 risk agents at the distributor level. Eight risk agents are set as priorities to be given mitigation actions. Eight mitigations at the producer and 11 acts at the distributor level were proposed to reduce the risk. Mitigation actions are ranked according to the effectiveness and difficulty of implementation. Based on expert judgment, improving coordination and cooperation between stakeholders is a strategy that significantly influences the performance of the infant milk formula supply chain.
Keyword: ANP, BOCR, HOR, Infant Milk Formula, SCOR-AHP

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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