Judul: Analysis of the Competitiveness of Chrysanthemum  Flowers in the Japanese Market
Abstrak: Bunga krisan merupakan salah satu komoditas florikultura yang mempunyai jumlah produksi terus meningkat. Sebagian besar bunga krisan Indonesia diekspor ke Jepang namun Indonesia hanya memenuhi 0,19% dari total ekspor bunga krisan ke Jepang. Penelitian ini bertujuan untuk (1) menganalisis keunggulan komparatif bunga krisan di pasar Jepang dan (2) mengalisis keunggulan kompetitif bunga krisan di pasar Jepang. Penelitian ini menggunakan metode Revealed Comparative Advantage untuk menganalisis keunggulan komparatif bunga krisan di Jepang dan metode Export Product Dynamic serta Diamond’s Porter untuk menganalisis keunggulan kompetitif bunga krisan di Jepang. Hasil peneltian menunjukan bahwa Indonesia tidak memiliki keunggulan komparatif, sedangkan terkait keunggulan kompetitif, ekspor bunga krisan Indonesia memiliki keunggulan kompetitif yang relatif lemah. Bunga krisan Indonesia berada pada posisi falling star serta faktor strategi, struktur, dan persaingan perusahaan menjadi keunggulan nasional untuk ekspor bunga krisan, sedangkan faktor kondisi, faktor industri terkait dan pendukung, faktor permintaan masih menjadi masalah dalam ekspor krisan Indonesia., Chrysanthemum is one of the floricultural commodities that has an increasing number of productions. Most of Indonesia's chrysanthemum flowers are exported to Japan but Indonesia only fulfills 0.19% of the total exports of chrysanthemums to Japan. This study aims to: (1) analyze the comparative advantage of chrysanthemums in the Japanese market and (2) analyze the competitive advantages of chrysanthemums in the Japanese market. This study uses the Revealed Comparative Advantage method to analyze the comparative advantage of chrysanthemums in Japan and the Export Product Dynamic and Diamond's Porter methods to analyze the competitive advantages of chrysanthemums in Japan. The results of the research show that Indonesia does not have a comparative advantage, while in terms of competitive advantage, Indonesian chrysanthemum exports have a relatively weak competitive advantage. Indonesian chrysanthemum flowers are in a falling star position and the company's strategy, structure and competition factors are a national advantage for chrysanthemum exports, while condition factors, related and supporting industry factors, demand factors are still a problem in Indonesian chrysanthemum exports.
Keyword: Diamond's Porter, EPD, International Trade, RCA, Diamond's Porter, EPD, International Trade, RCA

Judul: Analysis of Indonesian Cut Orchid Competitiveness in The South Korean Market
Abstrak: Anggrek potong merupakan salah satu komoditas florikultura yang memiliki banyak peminat di dunia terlihat dari nilai ekspor bunga anggrek potong Indonesia yang meningkat sebesar 71% pada tahun 2021. Hampir keseluruhan anggrek potong Indonesia diekspor ke Korea Selatan, namun pangsa pasar anggrek Indonesia di Korea Selatan hanya sekitar 6,22%. Tujuan dari penelitian ini adalah menganalisis keunggulan komparatif, menganalisis dinamika dan posisi daya saing bunga anggrek potong Indonesia di pasar Korea Selatan. Penelitian ini menggunakan metode Revealed Comparative Advantage (RCA) dan Market Share untuk menganalisis keunggulan komparatif dan Dynamic Revealed Comparative Advantage (DRCA) untuk menganalisis posisi dan dinamika daya saing komoditas bunga anggrek potong Indonesia. Hasil penelitian adalah anggrek potong Indonesia memiliki keunggulan komparatif sedang dan memiliki pangsa pasar yang meningkat setiap tahunnya. Namun apabila dibandingkan dengan Thailand, Indonesia tidak memiliki daya saing karena tidak memiliki keunggulan komparatif. Posisi daya saing keseluruhan ekspor anggrek potong Indonesia berada pada posisi falling star yang menyatakan bahwa pangsa pasar ekspor Indonesia mengalami peningkatan pada saat pangsa pasar ekspor dari dunia mengalami penurunan., Cut orchid is one of the floricultural commodities that has a lot of demand in the world, as can be seen from the export value of Indonesian cut orchids which increased by 71% in 2021. Almost all Indonesian cut orchids are exported to South Korea but the Indonesian orchid market share in South Korea is only around 6,22%. The purpose of this study is to analyze the comparative advantage, to analyze the dynamics and competitive position of Indonesian cut orchids in the South Korean market. This study uses Revealed Comparative Advantage (RCA) and Market Share methods to analyze comparative advantage and Dynamic Revealed Comparative Advantage (DRCA) to analyze the position and dynamics of the competitiveness of Indonesian cut orchids. The results of this study state that Indonesian cut orchids have a moderate comparative advantage and have a market share that increases every year. However, when compared with Thailand, Indonesia does not have competitiveness, so it does not have a comparative advantage. The position of the overall competitiveness of Indonesia's cut orchid exports is in a falling star position which states that Indonesia's export market share has increased while the world's export market share has decreased.
Keyword: Comparative advantage, DRCA, Falling star, Market share, RCA

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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