Judul: Analisis Faktor-Faktor yang Memengaruhi Minat Masyarakat Memiliki Asuransi Kesehatan di Masa Pandemi Covid-19
Abstrak: Asuransi kesehatan merupakan instrumen penting untuk mengalihkan risiko kerugian akibat sakit. Munculnya pandemi menyebabkan peningkatan risiko kesehatan. Penelitian ini bertujuan untuk mengidentifikasi faktor-faktor yang membangun minat seseorang memiliki asuransi kesehatan khususnya pada saat atau setelah pandemi. Model dalam penelitian ini merupakan pengembangan Theory of Planned Behaviour yang terdiri dari attitude towards behaviour, subjective norms, dan perceived behavioural control, dengan menambahkan faktor kesehatan, ekonomi, dan Covid-19 untuk meneliti minat memiliki asuransi kesehatan. Penelitian melibatkan 207 responden dengan kriteria berusia di atas 21 tahun atau lebih dan memiliki penghasilan. Penelitian menggunakan teknik analisis structural equation modeling. Hasil penelitian menunjukkan bahwa faktor ekonomi, attitude towards behaviour, dan subjective norms memiliki pengaruh signifikan terhadap minat. Faktor yang paling memengaruhi minat adalah subjective norms atau opini pihak ketiga mengenai asuransi kesehatan., Health insurance is an important instrument for transferring the risk of loss due to illness. The emergence of a pandemic causes an increase in health risks. This study aims to identify the factors that build interest in someone having health insurance, especially during or after a pandemic. The model in this study is the development of the Theory of Planned Behaviour which consists of attitudes toward behaviour, subjective norms, and perceived behavioural control, by adding health, economic, and Covid-19 factors to examine interest in having health insurance. The research involved 207 respondents with the criteria of being over 21 years old and having an income. This research uses structural equation model analysis techniques. The results of the research show that economic factors, attitudes toward behaviour, and subjective norms have a significant effect on interest. The factor that most influence interest is subjective norms or third party opinions regarding health insurance.
Keyword: Covid-19, SEM, TPB, Health insurance, interest

Judul: Analysis of Banyumas Community Interest in Additional Health Insurance during the Covid-19 Pandemic with Structural Equation Modelling
Abstrak: Asuransi kesehatan merupakan salah satu perlindungan di masa ketidakpastian pandemi Covid-19. Kenaikan jumlah akumulasi premi asuransi kesehatan terjadi pada periode Mei 2020 hingga Mei 2021. Penelitian ini bertujuan untuk mengetahui faktorfaktor yang memengaruhi minat masyarakat Kabupaten Banyumas terhadap asuransi kesehatan tambahan selama pandemi Corona Virus Disease 2019 (Covid-19). Teori Reasoned Action Aprroach menjadi landasan untuk membangun model dalam penelitian ini. Sementara itu, Structural Equation Modeling (SEM) digunakan sebagai basis analisis untuk menduga koefisien model kausalitas antar faktor. Data yang digunakan berasal dari kuesioner 130 responden yang berdomisili di Kabupaten Banyumas, berusia 18 – 60 tahun, dan belum memiliki asuransi kesehatan selain BPJS. Hasil penelitian ini menunjukkan bahwa variabel laten kontrol perilaku (PBC) berpengaruh signifikan secara positif kepada minat masyarakat Kabupaten Banyumas terhadap asuransi kesehatan tambahan selama pandemi., Health insurance is one of the protections during the uncertainty of the covid-19 pandemic. Increase in the accumulated number of health insurance premiums occurred in period May 2020 to May 2021. This study aims to determine what factors influence the interest of the people of Banyumas Regency towards additional health insurance during the Corona Virus Disease (Covid-19) pandemic. Reasoned Action Approach theory is the basis for building the model in this research. Meanwhile, Structural Equation Modeling (SEM) is used as the basis of analysis to estimate the coefficients of the causality model between factors. The data used comes from a questionnaire of 130 respondents who are domiciled in Banyumas Regency, aged 18 – 60 years old, and do not have health insurance other than BPJS. The result of this study indicates that the latent variables of percieved behavioral control (PBC) have a significant positive effect on the interest of the people Banyumas towards additional health insurance during the pandemic.
Keyword: asuransi kesehatan, Kabupaten Banyumas, RAA, SEM, health insurance, Banyumas Regency

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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