Judul: Analysis of Indonesian Cinnamon Export Competitiveness in the United State Market
Abstrak: Indonesia termasuk produsen kayu manis di pasar dunia yang bersaing dengan Sri Lanka dan Vietnam. Negara tujuan ekspor kayu manis berada pada Amerika Serikat dengan laju pertumbuhan 16,9%. Harga kayu manis Indonesia selalu mengalami peningkatan, tetapi tidak sejalan dengan volume ekspor. Penelitian ini bertujuan menganalisis daya saing, potensi, serta faktor-faktor yang memengaruhi ekspor kayu manis di pasar Amerika Serikat. Fokus penelitian komoditas kayu manis dengan kode HS 090611 (Spices; cinnamon (Cinnamomum zeylanicum Blume), neither crushed nor ground) pada periode 2016-2021, penelitian ini menggunakan metode Revealed Comparative Advantage (RCA), Export Product Dynamic (EPD), Diamond Porter’s, X-Model Potential Export Product, dan Ordinary Least Square (OLS). Hasil penelitian menunjukan Indonesia mempunyai keunggulan komparatif dan kompetitif, namun perlu mengevaluasi hasil analisis Diamond Porter’s yang menunjukan minimnya kualitas tenaga kerja, minimnya negara tujuan ekspor, kemunduran luas lahan produksi kayu manis Indonesia, minimnya teknologi terbaru, dan minimnya kegiatan industri hilir kayu manis Indonesia. Indonesia juga berada pada pasar optimis serta memiliki hubungan signifikan dengan harga kayu manis, jumlah populasi, dan nilai kurs rupiah di negara tujuan ekspor utama., Indonesia is a cinnamon producer in the world market which competes with Sri Lanka and Vietnam. Cinnamon export destination countries are in the United States with a growth rate of 16.9%. Indonesian cinnamon prices always increase, but not in line with export volume. This study aims to analyze the competitiveness, potential, and factors that influence cinnamon exports to the United States market. The focus of research on cinnamon commodities with HS code 090611 (Spices; cinnamon (Cinnamomum zeylanicum Blume), neither crushed nor ground) in the 2016-2021 period, this study uses the Revealed Comparative Advantage (RCA) method, Export Product Dynamics (EPD), Diamond Porter's , X-Model Potential Export Product, and Ordinary Least Square (OLS). The results of the study show that Indonesia has comparative and competitive advantages, but it is necessary to evaluate the results of Diamond Porter's analysis which shows the lack of quality of labor, the lack of export destination countries, the decline in the area of land for Indonesian cinnamon production, the lack of the latest technology, and the lack of Indonesian cinnamon downstream industry activities. Indonesia is also in an optimistic market and has a significant relationship with cinnamon prices, population size, and the value of the rupiah exchange rate in major export destination countries.
Keyword: Diamond Porter’s, Export Dynamic Product, Ordinary Least  Square, Revealed Comparative Advantage, X-Model Potential Export Product

Judul: Analysis of Indonesian Cinnamon Export Competitiveness in the International Market Period 2017 - 2021
Abstrak: Berdasarkan TradeMap (2022), pada periode 2017 – 2021 Indonesia adalah negara pengekspor kayu manis terbesar ke-4 di dunia. Untuk mempertahankan dan meningkatkan kinerja ekspor kayu manis Indonesia perlu diketahui faktor-faktor yang mempengaruhi nilai ekspor kayu manis. Penelitian ini bertujuan untuk menganalisis daya saing komparatif maupun kompetitif serta faktor-faktor apa saja yang mempengaruhi pertumbuhan ekspor kayu manis periode 2017 – 2021. Penelitian ini menggunakan tiga metode perhitungan yaitu Revealed Comparative Advantage (RCA), Indeks Spesialisasi Perdagangan (ISP), dan Constant Market Share (CMS). Hasil penelitian menunjukkan bahwa ekspor kayu manis memiliki keunggulan komparatif yang kuat pada ketiga jenis kode HS. Selain itu, hasil perhitungan keunggulan kompetitif pada kode HS 090619 dan kode HS 090620 berada pada tahap kematangan. Sedangkan kode HS 090611 berada pada tahap pertumbuhan. Faktor yang memberikan pengaruh positif terhadap pertumbuhan ekspor kayu manis Indonesia yaitu pertumbuhan standar dan distribusi pasar sedangkan faktor daya saing dan komposisi komoditas bernilai negatif., Based on TradeMap (2022), in the period 2017 – 2021 Indonesia is the 4th largest cinnamon exporting country in the world. To maintain and improve the performance of Indonesian cinnamon exports, it is necessary to know the factors that affect the value of cinnamon exports. This study aims to analyze comparative and competitive competitiveness as well as what factors affect the growth of cinnamon exports for the period 2017 – 2021. This study uses three calculation methods, namely Revealed Comparative Advantage (RCA), Trade Specialization Index (ISP), and Constant Market Shares (CMS). The results showed that the export of cinnamon has a strong comparative advantage in the three types of HS codes. In addition, the calculation results of competitive advantage on HS code 090619 and HS code 090620 are in the maturity stage. While the HS code 090611 is in the growth stage. Factors that have a positive influence on the growth of Indonesian cinnamon exports are standard growth and market distribution, while competitiveness and commodity composition are negative.
Keyword: Daya saing, Kayu manis

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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