Judul: Pengaruh Viral Marketing terhadap Brand Equity dan Dampaknya pada Keputusan Pembelian Ulang (Studi Kasus Pada Media Sosial Adorable Project).
Abstrak: Pada era digital, sebagian besar perusahaan beralih untuk melakukan kegiatan bisnisnya melalui jaringan internet dengan melakukan kegiatan promosi yang memanfaatkan media sosial dan berdampak pada terjadinya viral marketing. Salah satunya adalah Adorable Project yang merupakan local brand fashion paling diminati di Indonesia. Tujuan dari penelitian ini untuk menganalisis karakteristik responden konsumen pada media sosial Adorable Project, menganalisis pengaruh viral marketing terhadap brand equity (brand awareness, brand image, perceived quality), dan menganalisis pengaruh viral marketing terhadap keputusan pembelian (current dan future repurchase). Metode analisis yang digunakan adalah analisis deskriptif dan analisis Structural Equation Modeling-Partial Least Square (SEM-PLS). Hasil penelitian menunjukkan bahwa viral marketing mempengaruhi secara signifikan terhadap seluruh variabel laten brand equity dan berpengaruh tidak langsung terhadap current purchase dan future repurchase.
Keyword: brand equity, keputusan pembelian, media sosial, viral marketing, SEM-PLS

Judul: Analysis of the Effect of Viral Phenomena on Brand Equity and  Purchase Decisions of Cosmetic Products
Abstrak: Industri kosmetik Indonesia terus mengalami pertumbuhan sehingga persaingan antar pengusaha semakin ketat. Berbagai strategi pemasaran dilakukan salah satunya dengan cara menjadi viral. Penelitian ini bertujuan menganalisis pengaruh product knowledge, group references dan social media marketing terhadap brand equity, kemudian menganalisis pengaruh brand equity produk kosmetik terhadap keputusan pembelian konsumen. Penelitian dilakukan dengan menggunakan google form yang disebar langsung kepada responden. Responden dari penelitian ini yaitu followers dari akun TikTok Scarlett berjumlah 100 orang. Analisis melalui pendekatan kuantitatif yang didukung data kualitatif dengan metode survei menggunakan analisis Partial Least Square (PLS) dan program Smart PLS for windows. Hasil penelitian ini menunjukkan bahwa pengaruh ketiga komponen viral marketing terhadap brand equity sebesar 73,4%. Pengaruh tidak langsung ketiga komponen viral marketing terhadap keputusan pembelian melalui brand equity sebesar 57,5%., The Indonesian cosmetic industry continues to experience growth, so that competition between entrepreneurs is getting tougher. Various marketing strategies made one of which is by becoming viral. This study aims to analyze the effect of product knowledge, group references, and social media marketing on brand equity. Analyze the effect of brand equity on cosmetic products on consumer purchasing decisions. The research was conducted using a google form which distributes directly to the respondents. Respondents from this study were followers of Scarlett's TikTok account total of 100 people. Analysis through a quantitative approach supported by qualitative data with a survey method using Partial Least Square (PLS) analysis and the Smart PLS program for windows. The results of this study indicate that the effect of the three viral marketing components on brand equity is 73.4%. The indirect effect of the three viral marketing components on purchasing decisions through brand equity is 57.5%.
Keyword: brand equity, group references, product knowledge, purchase decision, social media marketing

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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