Judul: Pengaruh Brand Ambassador Terhadap Brand Image Tokopedia (Studi pada Mahasiswa Fakultas Ekonomi dan Manajemen IPB).
Abstrak: Tokopedia.com merupakan perusahaan marketplace Indonesia yang menjual berbagai macam kebutuhan sehari-hari dengan berbagai merek. Tokopedia mengandalkan brand ambassador sebagai penyampai informasi produknya. Tokopedia menggandeng Isyana Sarasvati sebagai brand ambassador untuk mempertahankan eksistensinya dan meningkatkan penjualannya di dunia bisnis online. Tujuan penelitian ini menganalisis pengaruh brand ambassador terhadap brand image Tokopedia secara parsial maupun secara bersama-sama, atribut brand ambassador meliputi daya tarik dan kredibilitas. Pengambilan contoh non probablity sampling dengan metode purposive sampling pada 97 Mahasiswa Fakultas Ekonomi dan Manajemen Institut Pertanian Bogor. Metode analisis yang digunakan adalah analisis deskriptif dan regresi linear berganda yang dilengkapi dilengkapi dengan uji F dan uji t. Hasil penelitian menunjukan atribut brand ambassador berpengaruh nyata terhadap brand image Tokopedia, dengan nilai koefisien determinasi 39.8%, dan sisanya (60.2%) dijelaskan oleh faktor-faktor yang lain yang tidak diteliti.
Keyword: brand ambassador, brand image, daya tarik, kredibilitas, tokopedia

Judul: The Influence of BTS as a Brand Ambassador on Brand Image and Purchase Intention of Comsumers Tokopedia in Indonesia
Abstrak: Mewabahnya virus corona menyebabkan terjadinya perubahan yang cukup signifikan, salah satunya kegiatan belanja. Mengawali tahun 2021, Tokopedia menggandeng boysgroup Korea, Bangtan Sonyeondan (BTS) sebagai brand ambassadornya. Tokopedia merupakan perusahaan e-commerce yang terus melakukan pengembangan strategi marketing untuk mendongkrak loyalitas dan minat beli konsumennya. Tujuan dilakukan penelitian ini ialah untuk mengidentifikasi karakteristik konsumen pengguna platform Tokopedia, menganalisis pengaruh brand ambassador terhadap brand image, menganalisis pengaruh brand ambassador terhadap minat beli konsumen, serta menganalisis pengaruh brand image terhadap minat beli konsumen. Metode analisis data yang digunakan adalah analisis deskriptif dan analisis SEM-PLS. Hasil penelitian menunjukkan bahwa terdapat pengaruh antara variabel brand ambassador terhadap brand image serta variabel brand image terhadap minat beli konsumen, sedangkan antara variabel brand ambassador terhadap minat beli konsumen tidak memiliki pengaruh., The outbreak of the corona virus has caused significant changes, one of which is shopping activities. Starting 2021, Tokopedia collaborates with the Korean boy group, BTS as its brand ambassador. Tokopedia is an e-commerce company that continues to develop marketing strategies to boost consumer loyalty and buying interest. The purpose of this research is to identify consumer characteristics of users of the Tokopedia platform, analyze the influence of brand ambassadors on brand image, analyze the influence of brand ambassadors on consumer purchase intention, and analyze the influence of brand image on consumer purchase intention. The data analysis method used is descriptive analysis and SEM-PLS analysis. The results showed that there was an influence between brand ambassador variables on brand image and brand image variables on consumer purchase intention, while between brand ambassador variables on consumer purchase intention had no effect.
Keyword: Brand ambassador, Brand image, BTS, Purchase intention, Tokopedia

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.
Keyword: