Judul: Design of Chili Mobile Application Prototype Based on Supply  Chain Management using Lean UX Method
Abstrak: Cabai merupakan komoditas sayuran unggulan nasional dan daerah karena memberikan keuntungan bagi para petani, baik secara biofisik, sosial maupun ekonomi. Faktor penyebab dari tingginya harga cabai adalah banyaknya permintaan cabai merah pada hari raya, dan faktor penyebab lainnya juga disebabkan dari faktor cuaca yang tidak menentu. Tujuan penelitian ini adalah menghasilkan prototipe versi mobile app dari aplikasi SCM Cabai. Penelitian ini dikembangkan dengan metode Lean UX yang terdiri dari empat tahapan. Tahap Create an Minimum Viable Product merupakan implementasi aplikasi yang menghasilkan prototipe. Pada tahap ini prototipe medium-fidelity dibuat dengan menggunakan aplikasi Figma. Tahap Run An Experiment adalah tahap pengujian prototipe aplikasi berbasis mobile dengan cara demo dan riview oleh satu orang UX desainer dan dua orang pengembang aplikasi versi web. Setelah dilakukan pengujian didapatkan nilai success rate dari tahap run an experiment yaitu sebesar 86.66 %. Terakhir, pada Feedback and Research pengujian dengan metode thinking aloud dilakukan oleh lima pengguna pelaku rantai pasok. Berdasarkan data yang didapatkan, nilai success rate pengujian pada iterasi pertama ini adalah sebesar 86 %. Hasil dari penelitian dapat disimpulkan bahwa aplikasi SCM Cabai berbasis mobile ini sangat membantu para petani dan juga pelaku rantai pasok lainnya dalam melakukan proses distribusi dan pencatatan lahan cabai., Chili is a national and regional superior vegetable commodity because it provides benefits for farmers, both biophysically, socially and economically. The factor causing the high price of chili is the large number of requests for red chili on holidays, and other contributing factors are also caused by erratic weather factors. The purpose of this study is to produce a prototype mobile app version of the Chili SCM application. This research was developed using the Lean UX method which consists of four stages. The Create an Minimum Viable Product stage is an application implementation that produces a prototype. At this stage a medium-fidelity prototype was created using the Figma application. The Run An Experiment stage is the testing phase of a mobile-based application prototype by means of a demo and review by one UX designer and two web version application developers. After testing, the success rate value from the run an experiment stage was 86.66 %. Finally, in Feedback and Research, testing using the thinking aloud method was carried out by five supply chain actors. Based on the data obtained, the success rate of the test in this first iteration is 86%. The results of the study can be concluded that this mobile-based Chili SCM application is very helpful for farmers and also other supply chain actors in carrying out the distribution and recording process of chili land
Keyword: chili, lean ux, supply chain management, user experience

Judul: Enterprise System Development for Chili Distribution Using Zachman Framework on Engineer Perspective and Technology Physics Model
Abstrak: Distribusi cabai di Indonesia perlu dikembangkan. Petani cabai saat ini melakukan pendataan hasil panen cabai secara manual hanya menggunakan blangko kertas yang mengakibatkan pendistribusian dan pengolahan data menjadi kurang praktis. Oleh karena itu perlu adanya sistem enterprise yang dapat membantu para petani pada proses distribusi informasi hasil cabai secara efisien. Pengembangan sistem enterprise ini menggunakan kerangka kerja Zachman yang berfokus pada perspektif perekayasa dan fisik teknologi. Hasil perancangan sistem berupa artefak-artefak yaitu relasi antar Entity Relationship Diagram (What), proses penggunaan sistem (How), lokasi teknologi (Where), user interface dan tanggung jawab pengguna(Who), jadwal perancangan dan penggunaan sistem (When), dan aturan pengembangan sistem (Why). Pada penelitian ini dilakukan pengembangan modul front-end sistem aplikasi berdasarkan hasil dari artefak yang terkumpul. Dengan adanya sistem ini dapat meningkatkan efisiensi pendistribusian informasi hasil cabai serta kualitas informasi yang didapat oleh para stakeholder., Chili distribution in Indonesia needs improvement. Presently, Chili farmers collect data on chili harvests manually using blank papers only which is less practical both at its distribution and data processing. Therefore, it is advisable to develop an enterprise system to help farmers in processing the distribution of information on chili products efficiently. The development of the enterprise system uses the Zachman Framework focusing on both the Engineer Perspective and Technology Physics. The results of system design are relationships between Entity Relationship Diagram (What), system use process (How), technology location (Where), user interfaces and users responsibility (Who), system design schedule and usage (When), and rules in system development (Why). In this research, the application front-end module is developed based on the results of the collected artifacts. The system can increase efficiency in the distribution of information on chili harvests and the quality of information obtained by stakeholders.
Keyword: Distribusi Cabai, Kerangka Kerja Zachman, Perspektif Perekayasa, Sistem Enterprise, Chili Distribution, Engineer Perspective, Enterprise System, Zachman Framework

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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