Judul: Implementation of Scrum for Development of REST API-Based Digital Cattle Registration System
Abstrak: Efektivitas manajemen dalam industri peternakan sapi diperlukan dalam mengatasi ketidakseimbangan antara kebutuhan dan produksi daging sapi di Indonesia. Salah satu permasalahan utama yang dihadapi adalah tidak adanya standarisasi sistem pencatatan ternak untuk memberikan informasi yang valid mengenai perkembangan ternak. Penelitian yang telah dilakukan oleh Basyir (2023) berhasil mengembangkan sistem registrasi bagi pendataan ternak sapi. Penelitian ini bertujuan mengembangkan sistem pencatatan ternak sapi yang lebih komprehensif dan terpusat. Penelitian ini dilakukan dengan metode Scrum, yang meliputi product backlog, sprint planning, daily scrum meeting, sprint review, dan sprint retrospective sebagai tahapannya. Sistem diuji melalui serangkaian sprint, dengan setiap sprint berfokus pada pengembangan dan penyempurnaan API untuk kategori user, cage, livestock, note, bcs, dan dashboard, serta deployment menggunakan Google Cloud Platform (GCP). Hasil pengujian blackbox testing menunjukkan semua test cases berhasil dan sesuai dengan ekspektasi. Sistem ini juga diuji menggunakan load testing dengan hasil yang baik sesuai dengan parameter yang diujikan yaitu throughput, response time, dan error rate., Management effectiveness in the cattle industry is needed to address the imbalance between beef demand and production in Indonesia. One of the main problems faced is the absence of a standardized livestock registration system to provide valid information on livestock development. Research conducted by Basyir (2023) successfully developed a registration system for cattle data collection. This research aims to develop a more comprehensive and centralized cattle recording system. This research was conducted using the Scrum method, which includes product backlog, sprint planning, daily scrum meeting, sprint review, and sprint retrospective as its stages. The system was tested through a series of sprints, with each sprint focusing on developing and refining APIs for the user, cage, livestock, note, bcs, and dashboard categories, as well as deployment using Google Cloud Platform (GCP). The results of blackbox testing showed that all test cases were successful and in line with expectations. The system was also tested using load testing with good results according to the parameters tested, namely throughput, response time, and error rate.
Keyword: Backend, scrum, YII2, REST API, sistem pencatatan ternak sapi, cattle recording system

Judul: Mobile Application for Monitoring Feed and Weight  Gain of Cattle Using Flutter
Abstrak: Sapi merupakan penyedia utama kebutuhan daging merah di Indonesia, dengan kontribusi signifikan terhadap kebutuhan gizi masyarakat. Berdasarkan data sektor pertanian, kehutanan, dan perikanan, kontribusi sapi potong mencapai 18 juta ekor dan sapi perah 582,2 ribu ekor pada tahun 2021, mengalami peningkatan dari tahun sebelumnya. Pemeliharaan ternak sapi di Indonesia sebagian besar dilakukan oleh peternak skala kecil dengan metode pencatatan yang belum terintegrasi secara digital. Oleh karena itu, diperlukan sistem pencatatan yang lebih praktis dan efisien. Penelitian ini bertujuan mengembangkan sebuah aplikasi mobile berbasis Flutter untuk memantau pakan dan kenaikan berat badan sapi. Aplikasi ini dirancang untuk mencatat data pakan dan berat badan sapi secara digital agar peternak dapat memantau secara lebih akurat. Penelitian ini menggunakan metode agile dengan framework Scrum yang melibatkan tahapan perencanaan product backlog, sprint planning, daily scrum, sprint review, dan sprint retrospective. Sistem pencatatan digital ini diharapkan dapat meningkatkan efisiensi dan efektivitas dalam pengelolaan ternak sapi., Cattle are the primary source of red meat in Indonesia, making a significant contribution to the nutritional needs of the population. According to data from the agriculture, forestry, and fisheries sectors, the contribution of beef cattle reached 18 million heads, and dairy cattle 582.2 thousand heads in 2021, showing an increase from the previous year. Livestock farming in Indonesia is mostly carried out by small-scale farmers with record-keeping methods that are not yet digitally integrated. Therefore, a more practical and efficient record-keeping system is needed. This study aims to develop a mobile application based on Flutter to monitor cattle feed and weight gain. This application is designed to digitally record cattle feed and weight data so that farmers can monitor it more accurately. This study uses the agile method with the Scrum framework, involving stages of product backlog planning, sprint planning, daily scrum, sprint review, and sprint retrospective. This digital record-keeping system is expected to improve efficiency and effectiveness in cattle management.
Keyword: aplikasi mobile, flutter, pencatatan ternak, pemantauan pakan

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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