Judul: Development of Automatic Land Assessment Features and Handling Potential Cron Job Failures in the INA Agro-GARLIC Backend Module.
Abstrak: Penelitian ini berfokus pada pengembangan fitur pada Sistem Pendukung Keputusan Spasial (SPKS) INA Agro-GARLIC untuk meningkatkan efektivitas penilaian kesesuaian lahan bawang putih di Indonesia. Dalam penelitian sebelumnya oleh Reyhan (2023), modul backend SPKS telah berhasil diimplementasikan, tetapi masih terdapat kekurangan, seperti kesulitan pengguna dalam memasukkan data syarat tumbuh secara manual dan masalah pada penanganan cron job yang dapat mempengaruhi klasifikasi lahan. Penelitian ini mengembangkan fitur otomatisasi untuk mendapatkan syarat tumbuh bawang putih, memudahkan pengguna dalam penilaian manual, serta melakukan penanganan cron job untuk mencegah kesalahan dalam klasifikasi lahan. Tahapan pada penelitian ini dibagi menjadi empat bagian yaitu identifikasi dan analisis kebutuhan pengguna, pemodelan modul backend, pengembangan modul backend, dan pengujian dan pengunggahan modul backend. Penelitian ini menghasilkan fitur penilaian lahan secara otomatis dan penanganan kegagalan cron job. Seluruh fitur yang dikembangkan telah diujikan dan diunggah pada server., This research focuses on developing features in the INA Agro-GARLIC Spatial Decision Support System (SPKS) to increase the effectiveness of assessing garlic land suitability in Indonesia. In previous research by Reyhan (2023), the SPKS backend module had been successfully implemented, but there were still shortcomings, such as difficulties for users in manually entering growth requirements data and problems with handling cron jobs which could affect land classification. This research develops an automation feature to obtain garlic growing conditions, makes it easier for users to manually assess, and handles cron jobs to prevent errors in land classification. The stages of this research are divided into four parts, namely identification and analysis of user needs, backend module modeling, backend module development, and backend module testing and uploading. This research produces an automatic land assessment feature and handling cron job failures. All features developed have been tested and uploaded to the server
Keyword: backend, garlic, cron job, INA Agro-GARLIC

Judul: Development of Frontend Module Feature on Spatial Decision Support System for Garlic Land Suitability
Abstrak: Evaluasi kesesuaian lahan untuk penanaman bawang putih sangat penting dilakukan guna meningkatkan produksi bawang putih. Penelitian ini bertujuan untuk mengembangkan modul frontend Agroecological Assessment of Land Suitability for Garlic (INA-Agro Garlic) menggunakan metode prototyping dengan beberapa tahapan, seperti komunikasi, perancangan cepat, pemodelan perancangan cepat, pembuatan prototipe, serta penyebaran dan umpan balik. Penelitian ini berhasil mengembangkan modul frontend INA-Agro Garlic yang ditandai dengan berhasilnya pengembangan fitur dashboard untuk manajemen pengguna, pengembangan peta kesesuaian lahan yang dapat menampilkan kelas kesesuaian lahan dalam bentuk marker dan poligon, serta implementasi faktor lama penyinaran sinar matahari per harinya pada penilaian kesesuaian lahan bawang putih. Pengujian sistem menggunakan metode blackbox testing telah memenuhi ekspetasi. Pengujian perhitungan kelas kesesuaian lahan dengan membandingkan hasil perhitungan kelas kesesuaian lahan secara manual dan hasil perhitungan kelas kesesuaian lahan menggunakan INA-Agro Garlic juga telah memenuhi ekspetasi., The evaluation of land suitability for garlic cultivation is crucial in order to enhance garlic production. This research aims to develop the frontend module of the Agroecological Assessment of Land Suitability for Garlic (INA-Agro Garlic) using the Prototyping method, which involves several stages such as communication, quick plan, modeling quick design, construction of prototype, and deployment, delivery, and feedback. This research successfully developed the frontend module of INA-Agro Garlic, characterized by the successful development of a dashboard feature for user management, the creation of a land suitability map that can display land suitability classes in the form of markers and polygons, and the implementation of the daily sunlight irradiation factor in garlic land suitability assessment. The system testing using black box testing method has met the expectations. The testing of land suitability class calculations by comparing the manually calculated land suitability class results with those obtained from INAAgro Garlic has also met the expectations.
Keyword: bawang putih, modul frontend, sistem pendukung keputusan spasial, frontend module, garlic, spatial decision support system

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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