Judul: Pengaruh Perceived Usefulness, Perceived Ease of Use, dan Perceived Risk terhadap Intention to Reuse ShopeePay pada Masa Pandemi COVID-19
Abstrak: World Health Organization telah menganjurkan kebijakan physical distancing untuk mengurangi kontak fisik, termasuk transaksi pembayaran selama masa pandemi COVID-19. Pembayaran digital merupakan salah satu alternatif untuk mengurangi risiko selama masa pandemi COVID-19. Salah satu pembayaran digital teratas selama masa pandemi COVID-19 ialah ShopeePay. Penelitian ini secara garis besar bertujuan untuk menganalisis pengaruh perceived usefulness, perceived ease of use, dan perceived risk terhadap intention to reuse ShopeePay di Jabodetabek. Responden pada penelitian ini sebanyak 492 responden. Teknik penentuan sampel dilakukan menggunakan non probability sampling dengan metode judgmental sampling. Teknik analisis data yang digunakan adalah analisis deskriptif dan SEM PLS. Hasil dari penelitian ini menunjukkan bahwa perceived usefulness, perceived ease of use, dan perceived risk memiliki pengaruh positif signifikan terhadap Intention to Reuse ShopeePay pada masa pandemi COVID-19. Kata kunci : Intention to Reuse, perceived usefulness, perceived ease of use, perceived risk, shopeepay, World Health Organization has recommended a physical distancing policy to reduce physical contact, including payment transactions during the COVID-19 pandemic. Digital payments are an alternative to reduce risk during the COVID-19 pandemic. One of the top digital payments during the COVID-19 pandemic was ShopeePay. This study broadly aims to analyze the effect of perceived usefulness, perceived ease of use, and perceived risk on the Intention to Reuse ShopeePay in Jabodetabek. Respondents in this study were 492 respondents. The sampling technique was carried out using non probability sampling with judgmental sampling method. The data analysis technique used is descriptive analysis and SEM PLS. The results of this study indicate that perceived usefulness, perceived ease of use, and perceived risk have a significant positive effect on ShopeePay's Intention to Reuse during the COVID-19 pandemic. Keywords: Intention to Reuse, perceived usefulness, perceived ease of use, perceived risk, shopeepay
Keyword: Intention to Reuse, Perceived Usefulness, Perceived Ease of Use, Perceived Risk, ShopeePay

Judul: The Influence of Ease of Use, Promotion, Financial Literacy on Intention to Reuse Shopee Paylater
Abstrak: Teknologi finansial di Indonesia merupakan salah satu teknologi yang mengalami peningkatan di era ekonomi digital sehingga mendorong masyarakat menggunakan sistem cashless payment. Salah satu jenis cashless payment adalah Paylater. Terdapat dua alasan utama yang memengaruhi masyarakat Indonesia menggunakan sistem pembayaran Paylater yaitu kemudahan dalam penggunaan dan promo yang ditawarkan. Pertumbuhan penggunaan Paylater harus diiringi oleh financial literacy yang terdiri dari financial knowledge, financial behavior, dan financial attitude. Paylater yang paling diminati masyarakat Indonesia adalah Shopee Paylater. Tujuan penelitian adalah menganalisis pengaruh kemudahan penggunaan, promosi, financial literacy terhadap minat menggunakan kembali Shopee Paylater. Penelitian ini dilakukan di wilayah Jabodetabek dengan menggunakan metode penelitian kuantitatif. Pengguna Shopee Paylater yang diteliti sebanyak 290 orang yang dipilih menggunakan teknik purposive sampling. Metode analisis data yang digunakan adalah SEM-PLS melalui software smartpls 4. Hasil penelitian menunjukkan bahwa adanya pengaruh kemudahan penggunaan, promosi, financial literacy dengan minat menggunakan kembali Shopee Paylater., Technology Financial in Indonesia is one of the technologies that has experienced an increase in the digital economy era, thus encouraging people to use a cashless payment system. One type of cashless payment is paylater. There are two main reasons that influence Indonesian people to use the paylater payment system, namely the ease of use and the promos offered. Growth in the use of paylater must be accompanied by financial literacy consisting of financial knowledge, financial behavior, and financial attitudes. The paylater that the people of Indonesia are most interested in is the shopee paylater. Thus, the purpose of this study was to analyze the effect of ease of use, promotion, and financial literacy on the intention to reuse shopee paylater. This research was conducted in the Greater Jakarta area using quantitative research methods. There were 290 research respondents who were selected using a purposive sampling technique. The data analysis method used is SEM-PLS through smartpls 4 software. The results show that ease of use, promotion, and financial literacy have a positive and significant effect on the intention to reuse shopee paylater.
Keyword: financial literacy, SEM-PLS, Shopee Paylater, teknologi finansial

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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