Judul: Analisis Kepuasan dan Loyalitas Konsumen Restoran Sop Ayam Pak Min Klaten Cabang Bogor.
Abstrak: Restoran Sop Ayam Pak Min Klaten Cabang Bogor adalah salah satu restoran di Kota Bogor dengan menu makanan utama sop ayam dengan cita rasa yang khas. Tujuan dari penelitian ini adalah untuk mendeskripsikan karakteristik konsumen, proses keputusan pembelian konsumen, kepuasan konsumen, dan loyalitas konsumen. Kuesioner survei dilakukan pada bulan Agustus 2017. Metode pengambilan sampel menggunakan metode convenience sampling. Jumlah responden dalam penelitian sebanyak 100 orang. Metode yang digunakan adalah dengan menggunakan analisis deskriptif, Importance Performance Analysis (IPA), Customer Satisfaction Index (CSI), dan piramida loyalitas. Berdasarkan Indeks Kepuasan Pelanggan (CSI) Restoran Ayam Pak Min Klaten Cabang Bogor sebesar 79.13 persen dan bisa dikategorikan sangat puas. Tingkat loyalitas pelanggan Restoran Sop Ayam Pak Min Klaten Cabang Bogor berada pada tahap habitual buyer atau dapat dikatakan tingkat loyalitas konsumen yang masih rendah.
Keyword: CSI, IPA, Piramida loyalitas

Judul: Analisis Kepuasan dan Loyalitas Konsumen Restoran Ayam KQ5 Bogor, Jawa Barat
Abstrak: Ayam KQ5 restaurant is one of the restaurants in Bogor that offers chicken as its specialty with special taste. The objective of this study is to analyze the characteristics, purchasing decision process, customer satisfaction and consumer loyalty that will have implications for the marketing mix of Ayam KQ5 Restaurant. Questionnaire survey was conducted in September 2013. The sampling method used was convenience sampling. There were 100 respondents participated on this research. The methods used in this research are a descriptive analysis method, Importance Performance Analysis, Customer Satisfaction Index and pyramid loyalty. Most of the customers are 19-24 years old, live in Bogor, bachelor graduate, single, and employee with income between Rp2 000 000-Rp5 000 000 per month. Based on Customer Satisfaction Index (CSI), the index of this restaurant was 69.85 percent which is in satisfied category. Based on Importance Performance Analysis, the major priorities to be improved were price, sanitation and employees’ performance. Customer loyalty level of this restaurant was switcher buyer or not loyal customer.
Keyword: loyalty pyramid, IPA, CSI

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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