Judul: Strategi Pengembangan Usaha Keripik Cek Sam pada Era New Normal dengan Pendekatan Business Model Canvas
Abstrak: Usaha Keripik Cek Sam merupakan industri pengolahan keripik bidang pertanian di Saree, Aceh Besar. Adanya pandemi Covid-19 menyebabkan penurunan pendapatan usaha, perubahan perilaku konsumen dan kebijakan protokol kesehatan sehingga membuat kegiatan operasional usaha Keripik Cek Sam berubah. Penelitian ini bertujuan untuk: (1) Mengidentifikasi profil usaha dan memetakan usaha Keripik Cek Sam ke dalam Business Model Canvas (BMC). (2) Menganalisis potensi dan prospek pengembangan usaha Keripik Cek Sam pada era new normal. (3) Menyusun strategi pengembangan usaha Keripik Cek Sam dalam bentuk BMC. Metode yang digunakan adalah metode BMC. Hasil strategi pengembangan usaha Keripik Cek Sam dalam bentuk BMC menunjukkan bahwa adanya proposisi nilai baru untuk meningkatkan hubungan baik dengan pelanggan yaitu jaminan kualitas dan kehalalan, jaminan higienis dan sanitasi, inovasi produk yang menyehatkan, dan penggunaan layanan online sebagai saluran baru. Hal tersebut mempengaruhi aktivitas kunci dan sumber daya utama pada usaha Keripik Cek Sam. Selain itu, usaha perlu menjalin kemitraan dengan petani, jasa ekspedisi, dan marketplace untuk memperluas segmentasi pelanggan. Penerapan strategi pengembangan yang baru pada usaha Keripik Cek Sam dapat meningkatkan biaya investasi sebesar Rp63.439.000 dan biaya operasional sebesar Rp1.394.817.300 per tahun, serta meningkatkan pendapatan sebesar Rp2.705.192.000., Keripik Cek Sam business is an agricultural chip processing industry in Saree, Aceh Besar. The existence of the Covid-19 pandemic caused a decrease in business income, changes in consumer behavior and health protocol policies that made Keripik Cek Sam business operations change. The research aims to: (1) Identify business profiles and map Keripik Cek Sam business into Business Model Canvas (BMC). (2) Analyze the potential and prospects of Keripik Cek Sam business development in the new normal era. (3) Develop a Keripik Cek Sam business development strategy in the form of BMC. The method used is the BMC method. The results of Keripik Cek Sam business development strategy in the form of BMC show that there is a new value proposition to improve good relationships with customers, namely quality and halal assurance, hygienic and sanitary guarantees, healthy product innovation, and the use of online services as new channels. This affects key activities and key resources in Keripik Cek Sam business. In addition, businesses need to establish partnerships with farmers, expedition services, and marketplaces to expand customer segmentation. The implementation of the new development strategy in Keripik Cek Sam business can increase investment costs by Rp63.439.000 and operating costs by Rp1.394.817.300 per year and increase revenue by Rp2.705.192.000.
Keyword: BMC, covid-19, new normal, potential, prospect

Judul: Analysis Of Cafe Hidden Yard Coffee and Kitchen Business Operational Strategy Development in Facing the New Normal Era
Abstrak: Munculnya pandemi Covid-19 di Indonesia pada Maret 2020 memberi dampak sangat besar bagi perekonomian dan perubahan gaya hidup masyarakat. Cafe HY salah satu yang terkena dampak, sehingga diperlukan sebuah strategi pengembangan operasional bisnis dalam memasuki era New Normal. Tujuan penelitian yaitu (1) Mengidentifikasi faktor internal dan eksternal bisnis Cafe HY dalam menghadapi era New Normal; (2) Merumuskan berbagai alternatif strategi pengembangan operasional bisnis dan menganalisis strategi prioritas untuk diterapkan oleh Cafe HY dalam menghadapi era New Normal dan; (3) Merekomendasikan implementasi strategi terpilih untuk diterapkan oleh Cafe HY dalam menghadapi era New Normal. Hasil identifikasi SWOT dianalisis dengan Matriks IFE, EFE, IE, dan QSP. Matriks IFE dan EFE menunjukan Cafe HY berdasarkan kondisi lingkungan internal dan eksternalnya lemah untuk merespon tuntutan perubahan lingkungan bisnis. Terdapat tiga alternatif strategi yang diperoleh berdasarkan hasil matriks IE yang telah disesuaikan dengan hasil matriks IFE dan EFE. Rekomendasi strategi prioritas yang diperoleh dari matriks QSP yaitu memaksimalkan pemanfaatan aplikasi dan platform digital sebagai sarana transaksi serta promosi dan iklan, dengan nilai STAS 3,50., The emergence of Covid-19 pandemic in Indonesia since March 2020 has a huge impact on the economy and changes in lifestyle. Cafe HY was one of the affected, so a business operational development strategy was needed in entering New Normal era. The research objectives are (1) to identify internal and external factors of Cafe HY in facing New Normal era; (2) Formulate alternative strategies for developing business operations and prioritizing strategies to be applied by Cafe HY in facing the New Normal era and; (3) Recommend the selected strategies to be applied by Cafe HY in facing the New Normal era. The results of SWOT identification were analyzed using IFE, EFE, IE, and QSP matrix. The IFE and EFE matrices show that based on internal and external conditions, Cafe HY is weak responding to the changing demands of the business environment. There are three alternative strategies obtained based on the results of IE matrix which have been adjusted to the results of IFE and EFE matrices. The priority strategy obtained from QSP matrix are maximizing the use of digital platform as a means of transactions as well as promotions and advertisements, with a STAS value of 3.50.
Keyword: Business Operational, Development Strategy, Pandemic Covid-19, Priority Strategy

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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