Judul: Strategi Pemasaran Restoran Sakabe Buffet Jakarta Pusat
Abstrak: Eksistensi restoran all you can eat semakin meningkat di Indonesia. Sakabe Buffet merupakan salah satu restoran all you can eat yang memiliki outlet di Pasar Baru, Jakarta Pusat. Berbagai masalah dihadapi oleh Sakabe Buffet seperti menurunnya jumlah pengunjung yang menyebabkan omzet yang didapatkan oleh restoran cenderung menurun selama beberapa bulan terakhir. Penelitian ini bertujuan untuk mengidentifikasi dan menganalisis faktor internal dan faktor eksternal yang memengaruhi restoran, sehingga dapat merumuskan alternatif dan prioritas strategi pemasaran yang dapat diterapkan oleh restoran Sakabe Buffet. Penelitian ini menggunakan metode analisis deskriptif dan analisis perumusan tiga tahap yang terdiri dari tahap masukan, tahap pencocokan, dan tahap pengambilan keputusan. Alat analisis yang digunakan pada penelitian ini adalah matriks IFE, matriks EFE, matriks IE, matriks SWOT dan matriks QSP. Hasil analisis matriks IFE menghasilkan Sakabe Buffet memiliki tujuh kekuatan dan empat kelemahan, dan pada matriks EFE menghasilkan Sakabe Buffet memiliki empat peluang dan tujuh ancaman yang dihadapi. Berdasarkan matriks IE, Sakabe Buffet memiliki kondisi lingkungan internal kuat dan eksternal yang tinggi dan berada pada sel I, yaitu posisi tumbuh dan membangun. Terdapat tujuh alternatif strategi yang dihasilkan dengan matriks SWOT dengan prioritas strategi yaitu Melakukan marketing campaign di sosial media., The existence of all you can eat restaurants is increasing in Indonesia. Sakabe Buffet is one of the all you can eat restaurants that has outlets in Pasar Baru, Central Jakarta. Sakabe Buffet has faced various problems such as the decline in the number of visitors which has caused the turnover obtained by the restaurant to tend to decline over the last few months. This study aims to identify and analyze internal and external factors that affect the restaurant, so that it can formulate alternatives and priorities for marketing strategies that can be applied by Sakabe Buffet restaurants. This research uses descriptive analysis method and three-stage formulation analysis consisting of the input stage, the matching stage, and the decision-making stage. The analytical tools used in this study are the IFE matrix, the EFE matrix, the IE matrix, the SWOT matrix and the QSP matrix. The results of the IFE matrix analysis result that Sakabe Buffet has seven strengths and four weaknesses, and the EFE matrix results in Sakabe Buffet having four opportunities and seven threats to face. Based on the IE matrix, Sakabe Buffet has high internal and external environmental conditions so that it is in cell I, which is the position to grow and build. There are seven alternative strategies produced with the SWOT matrix with strategic priorities, namely conducting marketing campaigns on social media.
Keyword: Pandemi, Pemasaran, Restoran, Sakabe, Strategi, pandemic, marketing, restaurant, strategy

Judul: Marketing Strategy for the Dapur Tahu Cafe in Padang City during the Covid-19 Pandemic
Abstrak: Dapur Tahu merupakan cafe yang menyediakan berbagai menu olahan tahu. Pada masa pandemi Covid-19, Dapur Tahu mengalami penurunan pendapatan. Tujuan dari penelitian ini untuk mengidentifikasi faktor internal dan eksternal, merumuskan alternatif strategi dan menetapkan strategi pemasaran yang diprioritaskan untuk diterapkan oleh Dapur Tahu. Metode yang digunakan dalam penelitian ini adalah analisis deskriptif dan analisis tiga tahap formulasi strategi. Alat analisis yang digunakan adalah matriks IFE, matriks EFE, matriks IE, matriks SWOT, dan matriks QSP. Hasil analisis matriks IFE menghasilkan Dapur Tahu memiliki sepuluh kekuatan dan dua kelemahan, dan pada matriks EFE menghasilkan Dapur Tahu memiliki memiliki lima peluang dan enam ancaman. Berdasarkan hasil analisis matriks IE, menunjukkan bahwa Dapur Tahu berada pada posisi tumbuh dan membangun. Analisis matriks SWOT didapatkan delapan alternatif strategi. Prioritas strategi yang dihasilkan dari QSPM adalah meningkatkan kegiatan promosi secara online dan offline. Saran untuk Dapur Tahu antara lain melakukan kegiatan promosi secara lebih gencar dari sebelumnya, memberikan pelayanan yang lebih pro pada penanganan Covid-19, mengoptimalkan penggunaan teknologi informasi dan komunikasi,dan menambah dekorasi interior., Dapur Tahu is a cafe that provides a variety of processed tofu menus. During the Covid-19 pandemic, Dapur Tahu experienced a decrease in income. The purpose of this research is to identify the internal and external factors, to formulate alternative strategies and to set prioritiezed marketing strategies which can be applied by Dapur Tahu. The methods used in this reasearch is the descriptive analysis and three stage formulation analysis. The tools of analysis that used are IFE matrix, EFE matrix, IE matrix, SWOT matrix and QSP matrix. Based on the result of the IFE matrix, Dapur Tahu have ten strengths and two weaknesses, and the EFE matrix resulted in Dapur Tahu having five opportunities and six threats. Based on the results of the IE matrix analysis, it shows that Dapur Tahu is in a position of grow and build. Through SWOT matrix analysis, six alternative strategies were found. The priority strategy is increase online and offline promotional activities. Suggestions for Dapur Tahu are to carry out promotional activities more intensively, provide more supportive service in handling Covid-19, optimize the use of information and communication technology, and add interior decorations.
Keyword: IFE, EFE, IE, SWOT, QSPM

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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