Judul: Analisis Persepsi Konsumen Terhadap Keputusan Pembelian Alas Kaki Yongki Komaladi
Abstrak: Tujuan penelitian ini adalah untuk mengetahui pengaruh persepsi konsumen terhadap keputusan pembelian alas kaki Yongki Komaladi. Metode analisis yang digunakan adalah analisis regresi linier berganda. Variabel persepsi konsumen dalam penelitian adalah kualitas, harga, citra merek dan promosi penjualan. Hasil Uji F menunjukkan bahwa persepsi konsumen (kualitas, harga, citra merek dan promosi penjualan) secara simultan mempengaruhi keputusan pembelian alas kaki Yongki Komaladi. Hasil uji t menunjukkan bahwa kualitas (sig 0.366) memiliki pengaruh positif dan tidak signifikan terhadap keputusan pembelian alas kaki Yongki Komaladi. Harga (sig 0.014), citra merek (sig 0.059) dan promosi penjualan (sig 0.011) memiliki pengaruh positif dan signifikan terhadap keputusan pembelian alas kaki Yongki Komaladi.
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Judul: Analisis Pengaruh In-Store Promotion Terhadap Persepsi Keputusan Impulse Buying Pada Alas Kaki Yongki Komaladi
Abstrak: Impulse buying is the behavior of consumers who make a purchase spontaneously, without planning beforehand. The purpose of this research is to analyze the impulsive consumen behavior of footwear YK and analyzing the influence of in-store promotion on consumer impulse buying perseption decision footwear YK. In-store promotion variables in this research is the purchase with purchase, price discounts, in-store display and personal selling. The analytical method used was a cross-tabulation analysis and multiple linear regression F test results shows that in-store promotion simultaneously influence to consumer decisions of impulse buying on YK footwear. T-test results showed only the purchase with purchase which has positive and significant result toward on decision of impulse buying on Yongki Komaladi Footwear, with a value of sig 0.001 . The coefficient of determination R2 0.178, it’s means the influence exerted by the variables in-store promotion at 17.8%.
Keyword: purchase with purchase., in-store promotion, impulse buying

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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