Judul: Design of an Android-Based Beef Traceability System Using QR Code
Abstrak: Daging sapi merupakan makanan yang sangat digemari di Indonesia. Namun ada beberapa aktor yang menyebabkan kelangkaan daging sapi yang beredar di pasaran sehingga menyebabkan kenaikan harga pada daging sapi. Ada juga aktor yang mencampur daging sapi dengan daging asing yang tidak layak dimakan. Oleh karena itu, dibutuhkan suatu sistem yang dapat melacak dan menyimpan seluruh data dan riwayat dari rantai pasok daging sapi. Penelitian ini bertujuan membuat rancang bangun sistem ketertelusuran rantai pasok daging sapi berbasis android menggunakan QR Code untuk mencegah malapraktik dalam rantai pasok daging sapi dan menjamin asal-usul daging sapi. Sistem ini diberi nama SmartMoo. Target pengguna sistem adalah aktor-aktor penting dalam rantai pasok daging sapi, meliputi peternakan sapi, feedlot, Rumah Potong Hewan (RPH) dan pasar. Investigasi dilakukan untuk mengetahui data apa saja yang diperlukan dalam sistem yang akan dibuat, dari data tersebut bisa disusun rancangan fungsional dan rancangan struktural. Setelah itu dibuat desain tampilan yang akan ditampilkan pada layar antarmuka pengguna (user interface). Selanjutnya tahapan kodifikasi aplikasi, setelah kodifikasi dilakukan pengujian sistem. SmartMoo sudah berhasil dibuat dengan Android Studio menggunakan layanan Firebase sebagai tempat penyimpanan datanya. Setelah sistem dibuat, dilakukan pengujian terhadap penggunaan aplikasi. Pengujian aplikasi terdapat tiga kategori, yaitu: desain, informasi dan aplikasi. Nilai likert kategori desain adalah 79,71% dan untuk kategori informasi dan aplikasi memiliki nilai yang sama, yaitu 87,5%. Data sudah bisa disimpan di Firebase dan fungsi untuk membuat QR Code sudah berhasil dibuat. Setelah QR Code terpindai, sistem sudah menampilkan data yang sesuai. Tahap pengujian menunjukkan bahwa SmartMoo harus terimplementasikan namun perlu banyak pengembangan dalam segi desain dan fungsi dari sistem., Beef is a food material that is very popular in Indonesia. However, there are several actors who have caused the scarcity of beef on the market, causing an increase in the price of beef. There are also actors who mix beef with foreign meat that is not edible. Therefore, a system that can track and/or store all data and history from the beef supply chain is needed. This study aims to design an Android-based beef supply chain traceability system using a QR Code to prevent malpractice in the beef supply chain and guarantee the origin of beef. This System is named SmartMoo. The target users are important actors in the beef supply chain, those are cattle farms, feedlot, slaughterhouses and beef market players. Investigations were carried out to find out what data needs to be included in the system to be created, from this data a functional design and structural design can be compiled. After that, the display which will be displayed on the user interface screen was designed, followed with application codification stage. The final stage was the system testing. There are three categories of application testing, namely: design, information and application. SmartMoo has been successfully created with Android Studio using the Firebase service as the data repository. The Likert value for the design category is 79.71% and for the information and application categories it has the same value, which is 87.5%. The data can be saved in Firebase and the function to create the QR Code has been successfully created. After
Keyword: Android, Traceability, QR Code, Feedlot

Judul: Rancang Bangun Aplikasi Pendataan Ternak Sapi Potong Menggunakan RFID Berbasis Android
Abstrak: Usaha peternakan sapi potong terbagi atas dua sektor, yaitu usaha ternak sapi potong rakyat dan perusahaan. Sebagian besar peternakan sapi potong di Indonesia merupakan peternakan rakyat. Pola pemeliharaannya masih tradisional, serta kepemilikan jumlah ternak yang terbilang masih sedikit antara 2-3 ekor/peternak. Karena kurangnya pengawasan dan kontrol terhadap ternak, standar mutu hasil ternak menjadi salah satu permasalahan yang mempersempit lingkup pasar dari usaha ternak sapi potong rakyat. Penelitian ini bertujuan untuk merancang dan membangun aplikasi berbasis Android yang dapat dipergunakan untuk membantu para peternak tradisional untuk mencatat dan mengakses data ternak sapi potong. Pendekatan dalam tahap perancangan aplikasi menggunakan metode pengembangan System Development Life Cycle (SDLC) yang terdiri dari investigasi sistem, analisis sistem, desain sistem aplikasi, implementasi sistem aplikasi, dan pemeliharaan sistem aplikasi. Hasil dari penelitian ini adalah aplikasi yang dapat mencatat dan menyajikan data ternak sapi potong sesuai dengan EPC pada label RFID yang dimiliki., The beef cattle farming business is divided into two sectors, namely the small-scale farmers and companies. The majority of beef cattle farming in Indonesia is carried out by small-scale farmers, with traditional breeding methods and a small number of cattle per farmer, usually between 2-3 heads of cattle. Due to the lack of supervision and control over the cattle, the quality standards of the cattle become one of the problems that narrow the market scope of small-scale beef cattle farming. This research aims to design and build an Android-based application that can be used to help traditional farmers record and access data on beef cattle. The approach in the application design phase uses the System Development Life Cycle (SDLC) method, which consists of system investigation, system analysis, application system design, implementation of the application system, and maintenance of the application system. The result of this research is an application that can record and present data on beef cattle according to the Electronic Product Code (EPC) on the RFID tag that the cattle have.
Keyword: Android, EPC, RFID, Sapi Potong

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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