Judul: Development of Back-End Knowledge Management  System Fruit Plant Cultivation Module Creating SOP and Daily Recording
Abstrak: In Indonesia, the export value of fruit has decreased due to the presence of several fruits does not meet the standard quality. PT. Agrowing has problems regarding the quality of the fruit that does not meet the standards in the modern market. So that we need a system that can assist in cultivating fruits. By implementing ICT, through a knowledge management system, users can seek, create, and store knowledge. Development system using the KMSLC method whose development focuses on the backend of the system. The existing cultivation guide knowledge is a guide for red guava cultivation that will be implemented into the system. The backend system is developed using the REST API architecture, the output of the REST API is in the form of JSON which will be used by the frontend. This study developed a core module of SOP creating and daily recording that has produced 28 API endpoints and endpoints successfully tested using the blackbox testing method., Di Indonesia nilai ekspor buah-buahan mengalami penurunan yang disebabkan karena kualitas buah yang tidak memenuhi standar. PT. Agrowing mengalami kendala mengenai kualitas buah yang tidak memenuhi standar dalam pasar modern, sehingga diperlukan sistem yang dapat membantu dalam melakukan budidaya buah-buahan. Dengan menerapkan ICT, melalui knowledge management system, pengguna dapat mencari, membuat, dan menyimpan pengetahuan. Pengembangan sistem menggunakan metode KMSLC yang pengembangannya berfokus pada bagian backend sistem. Pengetahuan panduan budidaya yang telah ada adalah panduan budidaya jambu biji merah yang akan diimplementasikan ke sistem. Backend sistem yang dikembangkan menggunakan arsitektur REST API, keluaran dari REST API adalah berbentuk JSON yang akan digunakan oleh frontend. Penelitian ini mengembangkan modul inti pembuatan sop dan pencatatan panduan yang telah menghasilkan 28 endpoint API dan telah berhasil dilakukan pengujian endpoint menggunakan metode blackbox testing.
Keyword: agrowing, backend, blackbox testing, buah-buahan, knowledge management system

Judul: Pengembangan Frontend Modul Pembuatan SOP dan Pencatatan Harian Knowledge Management System Budidaya Tanaman Buah
Abstrak: Badan Pusat Statistik mencatat bahwa jumlah ekspor buah-buahan Indonesia pada tahun 2019 mengalami penurunan hingga 27.15% dibandingkan tahun 2017. Salah satu penyebab turunnya jumlah ekspor adalah tidak terpenuhinya buah-buahan yang sesuai standar kualitas akibat minimnya pengetahuan budidaya yang dimiliki oleh petani buah. Penelitian ini membahas pengembangan knowledge management system untuk membantu pengguna untuk mengumpulkan, menyimpan, menyebarkan, dan menerapkan pengetahuan terkait budidaya dan kegiatan pascapanen. Pengembangan dilakukan secara tim dengan menggunakan metode KMS Life Cycle dan berfokus pada pengembangan sistem dari sisi frontend. Tampilan yang berhasil dibuat dalam penelitian ini adalah tampilan untuk menambah dan menampilkan SOP, membuat proyek tanam, membuat dan menampilkan laporan harian, mendaftar membership, dan dashboard. SOP yang telah dibuat oleh Admin akan diterapkan oleh Manajer kebun sebagai panduan dalam kegiatan budidaya buah., The Statistics Indonesia notes that the number of Indonesian fruit exports in 2019 decreased by 27.15% compared to what it was in 2017. One of the causes of the decline is the failure to provide fruits that meet quality standards due to the lack of knowledge owned by fruit farmers. This study discusses the development of a knowledge management system to help users discover, capture, share, and apply knowledge related to cultivation and post-harvest activities. The development of this system is carried out in a team using the KMS Life Cycle method and the development focuses on the front end side. The interface that was successfully created in this study is a page view to add and display SOPs, create planting projects, create and display daily reports, register for membership, and dashboards. The SOP that has been made by the admin will be applied by farmers as a guide in fruit cultivation activities.
Keyword: budidaya buah, frontend, KMS, KMSLC, SOP budidaya

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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