Judul: Analisis Live Streaming Shopping TikTok terhadap Customer Trust dan Customer Engagement serta Dampaknya pada Purchase Intention
Abstrak: Pandemi Covid-19 menyebabkan pengguna media sosial di Indonesia meningkat. Adanya peningkatan pengguna media sosial menjadikan peluang bagi pelaku usaha untuk memasarkan bisnisnya. TikTok Shop merupakan salah satu scommerce yang memudahkan para penggunanya untuk berbelanja pada aplikasi tersebut tanpa harus berganti aplikasi. Salah satu fitur yang dimiliki TikTok Shop adalah Live Streaming. Konsumen masih belum sepenuhnya percaya dengan toko online karena maraknya kasus penipuan. Oleh karena itu, penelitian ini bertujuan untuk menganalisis live streaming shopping terhadap customer trust, customer engagement, dan purchase intention terhadap masyarakat Indonesia. Metode pengambilan sampel menggunakan purposive sampling yang melibatkan 647 responden. Pengolahan data pada penelitian ini menggunakan SEM-PLS. Hasil yang didapatkan adalah live streaming shopping memiliki pengaruh positif signifikan terhadap customer trust, customer engagement, dan purchase intention.
Keyword: customer engagement, customer trust, live streaming shopping, purchase intention

Judul: Comparison of the Influence of Social Interaction and Online Trust on Purchase Intention in Social Commerce TikTok Shop and Instagram Shop
Abstrak: Globalisasi dan kemajuan teknologi menyebabkan pergeseran pola perilaku berbelanja dan berinteraksi masyarakat di Indonesia. Konsep social commerce hadir sebagai inovasi yang menggabungkan kegiatan berinteraksi dan berbelanja dalam satu tempat yang sama. Tiktok Shop dan Instagram Shop sebagai platform social commerce yang memiliki peran besar dalam industri social commerce perlu untuk meninjau keefektifan preferensi minat beli masyarakat. Penelitian ini bertujuan untuk mengkomparasi pengaruh social interaction dan online trust terhadap purchase intention pada Tiktok Shop dan Instagram Shop di Jabodetabek. Data dalam penelitian ini diperoleh melalui data primer. Analisis data yang digunakan adalah analisis deskriptif, analisis Wilcoxon Test, dan analisis SEM-PLS dengan sampel sebanyak 196 responden dengan teknik pengambilan sampel non probability sampling jenis purposive sampling. Hasil penelitian menunjukkan bahwa terdapat pengaruh social interaction dan online trust terhadap purchase intention secara positif dan signifikan serta terdapat pengaruh social interaction terhadap online trust secara positif dan signifikan. Juga ditemukan bahwa pengaruh online trust terhadap purchase intention pada Tiktok Shop lebih tinggi dibandingkan Instagram Shop sedangkan pengaruh social interaction terhadap purchase intention pada Tiktok Shop lebih rendah dibandingkan Instagram Shop., Globalization and technological advancements have led to a shift in shopping and interaction behavior patterns among Indonesian society. The concept of social commerce emerges as an innovation that combines interaction and shopping activities in one place. TikTok Shop and Instagram Shop, as prominent social commerce platforms, play a significant role in the industry and need to assess the effectiveness of consumer purchase intention preferences. This study aims to compare the influence of social interaction and online trust on purchase intention in TikTok Shop and Instagram Shop within the Greater Jakarta area. Data for this research were collected from primary sources. The data analysis employed descriptive analysis, Wilcoxon Test, and Structural Equation Modeling-Partial Least Squares (SEM-PLS) with a sample of 196 respondents, utilizing non-probability purposive sampling. The research findings indicate a positive and significant impact of social interaction and online trust on purchase intention, as well as a positive and significant impact of social interaction on online trust. Furthermore, it was found that the influence of online trust on purchase intention in Tiktok Shop is higher compared to Instagram Shop, while the influence of social interaction on purchase intention in Tiktok Shop is lower compared to Instagram Shop.
Keyword: social commerce, online trust, purchase intention, social interaction

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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