Judul: Development of Front-End Module System for Recording Transaction Distribution of Chili Using Blockchain Technology
Abstrak: Cabai merupakan salah satu komoditas yang mempunyai harga sangat berfluktuasi. Fluktuasi harga cabai berkontribusi terhadap terjadinya inflasi di Indonesia. Untuk memantau harga dan produksi cabai dibutuhkan sistem manajemen rantai pasok cabai melalui pemanfaatan teknologi blockchain. Oleh karena itu, dibuatlah sebuah sistem pencatatan transaksi distribusi cabai dengan menerapkan teknologi blockchain untuk mencatat semua transaksi produksi. Pengembangan sistem ini dilakukan secara tim dengan menggunakan metode pengembangan Extreme Programming. Penelitian ini berfokus pada implementasi teknologi blockchain pada pengembangan modul front end pencatatan distribusi cabai untuk setiap pengguna agar dapat memantau harga dan produksi cabai. Pengguna sistem ini merupakan aktor rantai distribusi cabai, yaitu produsen, pedagang pengepul, pedagang grosir, pedagang eceran, dan konsumen. Hasil penelitian ini adalah pembuatan tampilan aplikasi dan penggunaan teknologi blockchain pada transaksi distribusi cabai. Pada aplikasi ini, setiap aktor transaksi distribusi cabai mendapatkan transparansi harga dan informasi pasokan cabai pada setiap rantai distribusi., Chili is a commodity that has a very fluctuating price. The fluctuation of chili prices contributed to inflation in Indonesia. To monitor chili prices and production, a supply chain management system for chili is needed through the use of blockchain technology. Therefore, a system for recording chili distribution transactions was created by applying blockchain technology to record all production transactions. The development of this system is carried out in a team using the Extreme Programming development method. This research focuses on the implementation of blockchain technology in developing a front-end module for recording chili distribution for each user to monitor the price and production of chili. Users of this system are actors in the chili distribution chain, namely producers, wholesalers, wholesalers, retailers, and consumers. The results of this study are the making of application views and the use of blockchain technology in chili distribution transactions.
Keyword: Blockchain, Chili, Extreme Programming, Front end, Recording distribution transactions

Judul: Front-End Development of Blockchain Based Shallot Supply Chain System Using Prototyping Method
Abstrak: Bawang merah (Allium ascalonicum L.) merupakan komoditas hortikultura yang memiliki angka konsumsi rumah tangga tertinggi di Indonesia. Untuk menjaga kualitas dan keamanan produk maka diperlukan pemantauan pada kualitas produk pada rantai pasok bawang merah yang dimulai dari panen benih oleh penangkar hingga sampai ke tangan konsumen. Blockchain sebagai buku besar transaksi, dapat dimanfaatkan untuk melakukan pencatatan transaksi dan penelusuran transaksi pada rantai pasok. Penelitian ini bertujuan untuk mengembangkan aplikasi front-end pada sistem rantai pasok bawang merah berbasis blockchain menggunakan library ReactJS dan REST API untuk komunikasi data. Pengembangan sistem ini dilakukan secara tim dan menggunakan metode Prototyping. Hasil dari penelitian ini merupakan progressive web app yang dapat mencatat transaksi penangkar, petani, dan pengumpul pada rantai pasok dan dapat membantu konsumen dalam melakukan penelusuran pada komoditas bawang merah yang telah diuji menggunakan metode black-box. Diharapkan pada penelitian selanjutnya dapat dilakukan penelitian pada aspek user experience pada aktor rantai pasok., Shallot (Allium ascalonicum L.) is a horticultural commodity that has the highest household consumption rate in Indonesia. To maintain the quality and safety of the product, it is necessary to monitor product quality in the shallot supply chain, starting from seed harvesting by breeders to the hands of consumers. Blockchain as a transaction ledger can be used to record and trace transactions in the supply chain. This study aims to develop a front-end on the shallot supply chain blockchain system using the React JS library and REST API for data communication. The development of this system is carried out in a team using the Prototyping method. The results of this study are progressive web app that can record the transactions of shallot breeders, farmes, and collectors in the supply chain and enables consumers to conduct searches on the shallot commodity that have been tested using black-box method. It is hoped that further studies can conduct researchs on the user experience aspect of supply chain actors.
Keyword: blockchain, front-end, prototyping, shallots, supply chain

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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