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: Pengembangan Fitur pada Modul Backend Sistem Pendukung Keputusan Spasial Kesesuaian Lahan Bawang Putih
Abstrak: Permasalahan dalam meningkatkan produktivitas bawang putih adalah sulitnya menentukan lahan yang sesuai. Penelitian sebelumnya telah berhasil mengembangkan modul backend sistem pendukung keputusan spasial untuk melakukan evaluasi kesesuaian lahan bawang putih. Penelitian ini bertujuan untuk melakukan pengembangan dari modul backend pada penelitian sebelumnya. Pengembangan tersebut di antaranya melakukan pembatasan akses pada fitur penilaian kesesuaian lahan, membuat fitur-fitur yang bergantung dengan fungsi penyimpanan fail dapat digunakan, membuat data lokasi lahan pengguna dapat ditampilkan pada peta, memperbaiki penentuan titik tengah data satuan peta tanah (SPT), dan mendapatkan data lama penyinaran terbaru secara otomatis untuk daerah SPT pada data kesesuaian lahan. Tahapan pada penelitian ini yaitu identifikasi dan analisis kebutuhan, pemodelan modul backend, pengembangan modul backend, serta pengujian dan pengunggahan modul backend. Pengembangan menghasilkan 16 tabel baru yang telah dinormalisasi pada basis data. Kemudian, dihasilkan 37 Application Programming Interface baru dan 1 scheduler baru yang telah berhasil diunggah ulang dan diuji., The problem in increasing garlic productivity is the difficulty of determining suitable land. Previous study has succeeded in developing a spatial decision support system backend module to evaluate garlic land suitability. This study aims to improve the backend module developed in the previous study. These developments include restricting access to the land suitability assessment feature, making features that depend on the file storage function usable, making user-entered field location data can be shown on the map, fixing soil map unit (SMU) data midpoint determination, and getting the latest length of irradiation data automatically for SMU area on land suitability data. The stages in this study are identification and analysis of needs, backend module modeling, backend module development, and backend module testing and deployment. Development generates 16 new tables that have been normalized in the database. This study results 37 new Application Programming Interfaces and 1 new scheduler which have been successfully re-uploaded and tested.
Keyword: backend, garlic, garlic productivity, land suitability, 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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