Judul: Development of a Supporting Module for Garlic Land Suitability Assessment in the Mobile Application INA Agro-GARLIC
Abstrak: Pemerintah Indonesia memulai program perluasan penanaman bawang putih dengan mengevaluasi kesesuaian lahan karena bawang putih tidak dapat tumbuh di sembarang lahan. Beberapa peneliti berhasil mengembangkan aplikasi mobile INA Agro-GARLIC untuk mengevaluasi lahan. Penelitian ini bertujuan untuk mengembangkan fitur-fitur dan memperbaiki bug pada aplikasi mobile INA Agro- GARLIC. Metode pada penelitian ini adalah metode prototyping dengan tahapan komunikasi, perencanaan cepat, pemodelan perencanaan cepat, pengembangan prototipe, penyebaran, pengiriman, dan umpan balik. Penelitian ini berhasil memperbaiki dan menambahkan beberapa fitur dalam aplikasi mobile INA Agro- GARLIC sehingga aplikasi dapat digunakan pengguna dengan lebih mudah dan akurat untuk melakukan evaluasi kesesuaian lahan. Keberhasilan ini ditandai dengan hasil pengujian pada fitur pengisian faktor data syarat tumbuh yang telah memenuhi harapan, pengujian penilaian kelas lahan yang dihasilkan menggunakan aplikasi mobile telah sesuai dengan perhitungan manual, dan pengujian secara black box testing juga telah memenuhi harapan., The Indonesian government has initiated a program to expand garlic cultivation by evaluating land suitability because garlic cannot grow on just any land. Several researchers have successfully developed the mobile application INA Agro-GARLIC to evaluate land suitability. This research aims to develop features and fix bugs in the INA Agro-GARLIC mobile application. The method used in this research is prototyping method with stages of communication, rapid planning, rapid planning modeling, prototype development, deployment, and feedback. This research successfully fixed and added several features to the INA Agro-GARLIC mobile application so that the application can be used by users more easily and accurately to evaluate land suitability. This success is marked by the test results on the feature of filling in the data factor conditions that have met expectations, testing the land class assessment produced using mobile applications has matched manual calculations, black box testing has also met expectations.
Keyword: aplikasi mobile, bawang putih, evaluasi kesesuaian lahan, garlic, land suitability evaluation, mobile application

Judul: Pengujian Aplikasi Mobile pada Penilaian Agroekologi Kesesuaian Lahan Bawang Putih (INA AgroGARLIC) dengan Usability Testing
Abstrak: Bawang putih (Allium sativum L) merupakan jenis sayuran yang paling sering dikonsumsi oleh masyarakat Indonesia. Sayangnya, produktivitas bawang putih domestik semakin menurun ketika bawang putih impor dari China mulai masuk ke Indonesia. Saat ini pemerintah sedang berusaha untuk meningkatkan produktivitas bawang putih. Untuk membantu upaya tersebut dibentuklah Sistem Pendukung Keputusan Spasial dalam bentuk aplikasi mobile berbasis Android dengan nama INA Agro-GARLIC. Aplikasi tersebut dapat melihat kesesuaian lahan untuk ditanami bawang putih. Pada pengembangan iterasi pertama dan keduanya INA Agro-GARLIC belum melalui tahapan tes non-fungsional. Penelitian ini dilakukan dengan metode Usability Testing dan kuesioner PSSUQ (Post Study System Usability Questionnaire). Tujuan uji kebergunaan dari aplikasi ini supaya nantinya pengguna merasa terbantu dan tidak ragu untuk melakukan adopsi teknologi dengan memanfaatkan INA Agro-GARLIC. Hasil penelitian ini berupa rekomendasi perbaikan system. Rekomendasi yang diberikan yaitu memperbaiki beberapa desain tombol, diskusi kembali dengan pakar terkait penggunaan istilah dan memberikan beberapa tambahan fitur., Garlic (Allium sativum L) is the type of vegetable most often consumed by Indonesian people. Unfortunately, domestic garlic productivity continues to decline when imported garlic from China begins to enter Indonesia. Currently the government is trying to increase garlic productivity. To assist these efforts, a Spatial Decision Support System was formed in the form of an Android-based mobile application with the name INA Agro-GARLIC. This application can see the suitability of the land for planting garlic. In the development of the first and second iterations, INA Agro-GARLIC has not yet gone through the non-functional testing stage. This research was conducted using the Usability Testing method and the PSSUQ (Post Study System Usability Questionnaire) questionnaire. The aim of testing the usability of this application is so that later users will feel helped and will not hesitate to adopt technology by utilizing INA Agro-GARLIC. The results of this research are recommendations for system improvements. The recommendations given are to improve several button designs, discussing again with experts regarding the use of terms and providing several additional features.
Keyword: garlic, mobile application, PSSUQ, usability testing

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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