Judul: Analyzing the Influence of TikTok Strategies on Purchasing Decisions using TikTok Shop
Abstrak: Covid-19 forced almost all fulfillment of basic needs and various other activities to be diverted through digital services. Though they are now recovering, it seems that people are comfortable with the products and services provided through digital platforms, one of which is shopping through e-commerce. At this time, e-commerce competition is getting tougher in Indonesia coupled with the emergence of s-commerce. TikTok Shop as the most widely used s-commerce platform for shopping has its own way of being able to attract its consumers. The purpose of this study is to identify the characteristics of TikTok Shop consumers and analyze the influence of TikTok strategies such as live shopping, the TikTok algorithm, and the TikTok affiliate program on purchasing decisions through the TikTok Shop. The sample selection method uses a non-probability sampling method with a purposive sampling technique. The analytical method used is multiple linear regression analysis. The results show that TikTok Live Shopping, TikTok Algorithm, and the TikTok Affiliate Program have significant influences on purchasing decisions through the TikTok Shop.
Keyword: Purchasing Decision, Multiple Linear Regression, TikTok Shop, TikTok Live Shopping, TikTok Algorithm, TikTok Affiliate Program

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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