Judul: Pengaruh Produktivitas Tenaga Kerja Terhadap Pertumbuhan Ekonomi di Negara ASEAN
Abstrak: Pertumbuhan ekonomi merupakan salah satu indikator yang sangat penting untuk melihat kinerja perekonomian suatu negara. Salah satu yang mendorong pertumbuhan ekonomi adalah produktivitas tenaga kerja. ASEAN merupakan organisasi geopolitik dan ekonomi yang ada di Asia Tenggara yang bertujuan meningkatkan pertumbuhan ekonomi, kemajuan social, dan pengembangan kebudayaan negara anggotanya. ASEAN memiliki peran penting tidak hanya letaknya yang startegis, ASEAN juga tengah berkembang pesat menjadi pusat ekonomi secara regional di dunia. Tujuan penelitian ini adalah untuk menganalisis pengaruh produktivitas tenaga kerja terhadap pertumbuhan ekonomi di negara-negara ASEAN dengan menggunakan data cross section 10 negara ASEAN dan time series waktu 10 tahun dari tahun 2010 hingga 2019. Hasil penelitian menunjukkan bahwa variabel labor productivity, foreign direct investment (FDI) dan human capital berpengaruh signifikan dan positif terhadap pertumbuhan ekonomi. Unemployment tidak signifikan terhadap pertumbuhan ekonomi di negara-negara ASEAN., Economic growth is one of the most important indicators to see the economic performance of a country. One of the factors that drive economic growth is labor productivity. ASEAN is a geopolitical and economic organization in Southeast Asia that aims to increase economic growth, social progress, and cultural development of its member countries, ASEAN is also rapidly developing into a regional economic center in the world. The purpose of this study is to analyze the effect of labor productivity on ASEAN countries using croos section data of 10 ASEAN countries and a 10 year time series from 2010 to 2019. The result show that the variables of labor productivity, foreign direct investment (FDI), and human capital have a significant and positive effect on economic growth. Unemployment is not significant to economic growth in ASEAN counstries.
Keyword: ASEAN, labor productivity, panel data, economic growth

Judul: The Effect of Labor Productivity on Economic Growth in Lower Middle Income Countries
Abstrak: Produktivitas tenaga kerja merupakan satuan yang menunjukkan kemampuan negara dalam mengelola sumber daya manusia. Efisiensi produktivitas tenaga kerja akan mendorong pertumbuhan ekonomi. Dalam lima tahun terakhir, kategori negara lower middle income mengalami perlambatan dalam tingkat pertumbuhan produktivitas tenaga kerja yang berpotensi meningkatkan ketimpangan ekonomi terhadap negara high income. Tujuan penelitian ini adalah untuk menganalisis pengaruh produktivitas tenaga kerja terhadap pertumbuhan ekonomi beserta faktor yang mempengaruhi produktivitas tenaga kerja di negara lower middle income dengan menggunakan data cross section 10 negara lower middle income dan time series tahun 2010 hingga 2019. Hasil penelitian menunjukkan labor productivity, foreign direct investment, trade openess, dan human development index berpengaruh signifikan positif terhadap pertumbuhan ekonomi. Sementara produktivitas tenaga kerja dipengaruhi secara positif dan signifikan oleh pertumbuhan sektor industri, pertumbuhan sektor jasa, serta gross fixed capital formation., One of the ways for a country to measure its ability on managing their human resources is through labor productivity. It is widely believed that an increase in labor productivity would lead to economic growth. In the last five years, the growth rate of labor productivity in lower middle income countries starts to decelerate. This could lead into an even bigger economic inequality between these countries and higher income countries. The purpose of this study is to analyze the effect of labor productivity on the economy of lower middle income countries and factors that affect labor productivity itself. Ten lower middle income countries were taken as cross section data and the time range was from 2010 to 2019. The result showed that the variables of labor productivity, foreign direct investment, trade openness, and human development index had significant and positive effect on economic growth. Meanwhile, gross fixed capital formation alongside growth of industrial and service sectors were factors that significantly increase labor productivity.
Keyword: panel data, Lower Middle Income Countries, economic growth, labor productivity

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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