Judul: Global Value Chain (GVC) of Indonesian Pulp and Paper Industry: Multiregional Input-Output (MRIO) Approach
Abstrak: Global Value Chain (GVC) berperan penting bagi suatu negara, terutama untuk negara berkembang seperti Indonesia. Partisipasi dalam GVC dapat meningkatkan produktivitas dan daya saing yang mengarah pada pembangunan berkelanjutan. Indonesia merupakan produsen pulp ke-8 dan kertas ke-6 di dunia. Penelitian ini bertujuan untuk menganalisis partisipasi GVC industri pulp dan kertas Indonesia, menganalisis keterkaitan industri pulp dan kertas Indonesia terhadap sektor dan negara lain, serta menganalisis dampak peningkatan ekspor pulp dan kertas Indonesia terhadap output dan nilai tambah. Metode yang digunakan merupakan analisis keterkaitan dan analisis dampak menggunakan Tabel MRIO tahun 2022 menurut 35 sektor industri dan 63 negara. Hasil penelitian menunjukkan bahwa partisipasi industri pulp dan kertas Indonesia dalam GVC masih rendah. Industri pulp dan kertas Indonesia masih lemah baik dalam menarik pertumbuhan produksi sektor hulunya maupun dalam mendorong pertumbuhan produksi sektor hilirnya. Industri ini juga memiliki keterkaitan ke depan dengan negara lain yang didominasi oleh industri pulp dan kertas itu sendiri tetapi masih memiliki nilai yang rendah. Peningkatan ekspor pada industri pulp dan kertas Indonesia memiliki pengaruh yang besar terhadap output dan nilai tambah di industri perekonomian Indonesia., Global Value Chain (GVC) plays an important role for a country, especially for developing countries like Indonesia. Participation in GVC can increase productivity and competitiveness leading to sustainable development. Indonesia is the 8th pulp and 6th paper producer in the world. This study aims to analyze the GVC participation of the Indonesian pulp and paper industry, analyze the linkages of the Indonesian pulp and paper industry to other sectors and countries, and analyze the impact of increasing Indonesian pulp and paper exports on output and added value. The method used is a linkage analysis and impact analysis using the MRIO Table in 2022 according to 35 industrial sectors and 63 countries. The results of the study show that the participation of the Indonesian pulp and paper industry in GVC is low. The Indonesian pulp and paper industry is low both in attracting growth in its upstream sector production and in encouraging growth in its downstream sector production. This industry also has future linkages with other countries that are dominated by the pulp and paper industry itself but still have low value. Increasing exports in the Indonesian pulp and paper industry has a major impact on output and added value in the Indonesian economic industry.
Keyword: ekspor, GVC, MRIO, industri pulp dan kertas

Judul: Indonesia's Textile and Apparel Industry in Global Value Chain: Multiregional Input-Output Approach
Abstrak: Global value chain (GVC) merupakan kegiatan perekonomian yang timbul akibat globalisasi. Partisipasi suatu negara dalam GVC dapat meningkatkan ekspor di negara tersebut. Berkembangnya teknologi dan informasi melalui globalisasi mengubah gaya hidup masyarakat khususnya di bidang fesyen, tak terkecuali di negara berkembang seperti Indonesia. Sektor tekstil dan produk tekstil (TPT) Indonesia merupakan salah satu sektor yang difokuskan untuk ditingkatkan partisipasinya dalam GVC, namun kinerjanya justru menurun seiring tahun. Penelitian ini bertujuan untuk menganalisis partisipasi sektor TPT Indonesia dalam GVC serta keterkaitannya terhadap sektor-sektor di negara lain dan menganalisis dampak dari peningkatan ekspor sektor TPT Indonesia terhadap output dan nilai tambah menggunakan tabel MRIO tahun 2022. Penelitian ini menemukan bahwa keterkaitan sektor TPT Indonesia cenderung lebih tinggi ke belakang. Hal tersebut menunjukkan bahwa sektor TPT Indonesia berperan dalam GVC sebagai sektor pengguna input yang banyak berasal dari Cina dan Korea Selatan, walaupun posisinya masih rendah. Maka dari itu, input yang digunakan dari negara tersebut perlu ditingkatkan efisiensinya agar produktivitas sektor TPT Indonesia meningkat., The global value chain (GVC) are economic activities that arise from globalization. A country's participation in GVC could increase its exports. The development of information and technology through globalization has changed people's lifestyles, especially in the fashion industry, not to mention in developing countries such as Indonesia. Indonesia's textile and apparel (T&A) sector is one of the sectors focused on increasing its participation in GVC, but its performance has declined over the years. This study aims to analyze the participation of Indonesia's T&A sector in the GVC and its linkages to other sectors in different countries, as well as to analyze the impact of an increase in exports of Indonesia's T&A sector on output and value-added using the 2022 MRIO table. This study finds that the linkages of Indonesia's T&A sector tend to be higher backward. This indicates that Indonesia's T&A sector plays a role in the GVC as a user of inputs, which largely come from China and South Korea, although its position in GVC is still low. Therefore, the efficiency of inputs used from those countries needs to be improved to increase the productivity of Indonesia's T&A sector.
Keyword: Indonesia, Global Value Chain, Multiregional Input-Output, Tekstil, Textile

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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