Judul: Design an Android Based Shallot Distribution Traceability System Using QR Code
Abstrak: Tingginya jumlah produksi bawang merah di Indonesia tidak diiringi dengan informasi yang jelas mengenai asal-usul produk selama proses distribusi. Asal-usul di sini mencakup penanaman, kualitas, jumlah, harga, penanganan yang dilakukan, dan pelaku yang bertanggung jawab selama proses distribusi sampai ke tahap akhir rantai pasok. Oleh karena itu sistem ketertelusuran (traceability) menjadi hal penting untuk dikembangkan untuk memperoleh informasi asal-usul yang jelas dari suatu produk. Penelitian ini bertujuan mengidentifikasi rantai pasok distribusi bawang merah dan membuat rancang bangun sistem ketertelusuran distribusi berbasis android dengan implementasi Quick Response (QR) Code. Metode yang digunakan dalam penelitian ini adalah System Development Life Cycle (SDLC) model waterfall. Hasil penelitian menunjukkan bahwa rantai pasok bawang merah dimulai dari petani, perantara, pedagang pengepul, pasar induk, pengecer, dan konsumen rumah tangga. Penelitian juga menghasilkan aplikasi android bernama Shobis yang dibangun menggunakan bahasa Kotlin dan layanan Firebase. Seluruh data ketertelusuran disimpan menggunakan kode unik berupa QR Code. Sistem ketertelusuran yang dibangun dapat dikelola oleh kementrian perdagangan, e-commerce, dan konsumen industri seperti UMKM. Biaya yang diperlukan untuk menjalankan sistem ini dibagi menjadi dua yaitu biaya yang dikeluarkan aktor dan organisasi meliputi biaya tetap serta biaya tidak tetap. Pengujian sistem dilakukan untuk mengetahui seluruh sistem berfungsi dengan baik. Pemeliharaan juga dilakukan untuk mengevaluasi sistem yang telah dibangun. Evaluasi dilakukan menggunakan metode System Usability Scale (SUS) dan memperoleh skor 70,48 serta percentile rank 56%., The high amount of shallot production in Indonesia is not accompanied by clear information on the origin of the product during the distribution process. This includes planting, quality, quantity, price, handling, and responsible actors during the distribution process to the final stage of the supply chain. Therefore, it is important to develop a traceability system to obtain clear information on the origin of a product. This research aims to identify the shallot distribution supply chain and design an Android-based distribution traceability system with Quick Response (QR) Code implementation. The method used in this research is the System Development Life Cycle (SDLC) waterfall model. The results showed that the shallot supply chain starts from farmers, intermediaries, collecting traders, wholesale markets, retailers, and household consumers. The research also produced an Android application called Shobis which was built using the Kotlin language and Firebase services. All traceability data is stored using a unique code in the form of a QR Code. The traceability system can be managed by the Ministry of Trade, e-commerce, and industrial consumers such as MSMEs. The costs required to run this system are divided into 2 namely, costs incurred by actors and organizations, including fixed and non-fixed costs. System testing is conducted to determine if the entire system is functioning properly. Maintenance is also carried out to evaluate the system that has been built. The evaluation was carried out using the System Usability Scale (SUS) method and obtained a score of 70.48 and a percentile rank of 56%.
Keyword: android, QR Code, SDLC, shallot, traceability

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: The Effects of Variance of Interest rate to Variance of Annuity Future Values
Abstrak: Time value of money is a concept that refers to the difference of the value of money due to time difference. The value of money for present time would not be the same as the value of money in the future. The value of money for present time is called as Present Value (PV) of the money and the value of money for future time is called Future Value (FV) of the money. Determination the value of money, for present and future time, depends on the time and rate of return. The value of money is determined by several factors such as inflation, fluctuation of interest rates, and government policy in securities and taxation. Due to fluctuation of the value of money we need a FV formulation, it is useful for knowing whether an investment can be profitable or not, and this information is useful also in budget analysis. Annuity is defined as a series of payments made for a specific period. The payment, fixed or varied, can be made at the beginning or at the end of the period. Annuity paid at the beginning of the period is called annuity-due and annuity paid at the end of the period is called immediate annuity-certain. The accumulated value of the annuity after few years later is called as a final value or a future value. Burnecki et al. (2003) have discussed about the FV of a fixed-rate annuity in which payments are made according to the arithmetic or geometric series. They have also examined FV for annuities in which payments are made according to arithmetic or geometric series with random rates of interest. This paper examines FV for annuity-due in which payments are made according to arithmetic or geometric series with interest rates as a random variable, which is normal distribution ,  . Future value formula is expressed in recursive form. FV for annuity-due which payments are made according to the arithmetic or geometric series with random rates of interest is calculated by theoretical way and simulation way. The random rates of interest is denoted as k k i  i  , where k i an independent random variable; i is a constant and k  is a random variable which has normal distribution ,  . By using the determined parameters, a sequence of random rates of interest are generated for theoretical calculation. Meanwhile for the simulation, the random rates of interest is generated 1000 times for the simulation. The generated data give mean value, variance, and standard deviation. Moreover, error of mean value, variance, and standard deviation from the theoretical and simulation results are calculated. Error calculation uses Symmetric Mean Absolute Percentage Error (SMAPE). The smaller the value of SMAPE is the more accurate the simulation. The interest rate variances are varied from 0.000036 to 0.0001 to study the relationship between variance of rates of interest and variance of future value. The theoretical and simulation results show that when the variance of random rates of interest increases, then the variance of FV increases linearly. FV of the annuity-due in
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