Judul: Design of a Monitoring System for Agricultural Cultivation Parameters in Controlled Enviroments Based on Internet of Things
Abstrak: Budidaya pertanian pada lingkungan terkendali dirancang untuk mengoptimalisasi kegiatan budidaya, pengendalian hama/penyakit, dan peningkatan produktivitas. Beberapa parameter budidaya yang dikendalikan antara lain suhu udara, kelembaban udara relatif, intensitas cahaya, suhu perakaran, dan kelembaban perakaran, yang perlu dipantau. Sistem yang memantau parameter ini diperlukan sebagai dasar pengendalian lingkungan budidaya. Penelitian ini bertujuan merancang sistem pemantauan yang mendukung pengendalian budidaya pertanian pada lingkungan terkendali (plant factory, greenhouse, dan screenhouse) berbasis Internet of Things (IoT). Metode yang digunakan dalam penelitian ini adalah System Development Life Cycle (SDLC) yang terdiri dari tahap analisis kebutuhan sistem, desain sistem, implementasi sistem, dan pengujian sistem. Hasil penelitian berupa sistem pemantauan yang mencakup konfigurasi perangkat keras, perangkat lunak, jaringan, basis data, dan manajemen pengguna dalam bentuk antarmuka pengguna. Sistem dapat diakses melalui website www.digitalfarming.my.id. Hasil pengujian fungsional menunjukkan semua perangkat berfungsi baik. Berdasarkan uji System Usability Scale (SUS), sistem layak digunakan dengan nilai SUS 79, yang artinya sistem dapat diterima pengguna dan masuk dalam kategori B atau baik., Controlled environment agriculture is designed to optimize cultivation activities, pest/disease control, and productivity enhancement. Key parameters to monitor include air temperature, relative humidity, light intensity, root temperature, and root moisture. A system to monitor these parameters is essential for controlling the cultivation environment. This study aims to design a monitoring system that supports agricultural cultivation control in controlled environments (plant factory, greenhouse, and screenhouse) based on the Internet of Things (IoT). The method used in this research is the System Development Life Cycle (SDLC), which includes system requirements analysis, system design, system implementation, and system testing. The research results include a monitoring system comprising hardware configuration, software, network, database, and user management in a user interface. The system can be accessed via the website www.digitalfarming.my.id. Functional testing results show all devices operate well. Based on the System Usability Scale (SUS), the system is feasible to use with a SUS score of 79, indicating that the system is acceptable to users and falls into the B or good category.
Keyword: internet of things, monitoring system, website, agricultural cultivation, controlled environment

Judul: Development of Microclimate Monitoring System for Multi-Greenhouse using Internet of Things
Abstrak: Suhu udara, kelembapan udara, dan intensitas cahaya merupakan parameter lingkungan mikro di dalam rumah tanaman yang berpengaruh terhadap pertumbuhan tanaman dan perlu dilakukan pemantauan. Saat ini, Internet of Things (IoT) merupakan teknologi yang mumpuni dan dapat digunakan untuk melakukan pemantauan lingkungan mikro rumah tanaman di berbagai lokasi secara langsung. Tujuan penelitian ini yaitu rancang bangun sistem pemantauan suhu nutrisi, suhu udara, kelembapan udara, dan intensitas cahaya pada berbagai rumah tanaman berbasis IoT. Penelitian ini menggunakan metode System Development Life Cycle (SDLC) yang terdiri dari: (1) analisis kebutuhan sistem, (2) desain sistem, (3) implementasi sistem, dan (4) pengujian sistem. Perangkat elektronika yang digunakan yaitu sensor DHT21, BH1750, DS18B20, dan mikrokontroler ESP32. Hasil perhitungan Root Mean Square Error (RMSE) dan Mean Absolute Percentage Error (MAPE) pada kalibrasi sensor yang rendah menunjukkan nilai eror data dari pembacaan sensor yang kecil. Desain sistem dibuat menggunakan rancangan database dan entity relationship diagram. Sistem diimplementasikan pada berbagai rumah tanaman yaitu dua greenhouse tipe standard peak dan satu plant factory. Berdasarkan hasil uji System Usability Scale (SUS), didapatkan nilai SUS 75,67 yang artinya sistem dapat diterima oleh pengguna dan termasuk kategori sistem yang baik pada kelas B. Kesimpulan dari penelitian ini yaitu sistem pemantauan lingkungan mikro pada berbagai rumah tanaman berhasil dilakukan menggunakan perangkat elektronika berbasis IoT yang dapat diakses oleh pengguna pada web server., Air temperature, air humidity, and light intensity are microclimate parameters in greenhouse that affect plant growth and must be monitored. Currently, the Internet of Things (IoT) is powerful and can be used to monitor microclimate parameters in multi-greenhouse at various locations directly. The purpose of this research is to design and develop a system for monitoring nutrient temperature, air temperature, air humidity, and light intensity in multi-greenhouse based on IoT. This research used the System Development Life Cycle (SDLC) method, which consists of: (1) system requirement analysis, (2) system design, (3) system implementation, and (4) system testing. The electronic devices used were DHT21, BH1750, DS18B20 sensors, and ESP32 microcontroller. The low values of Root Mean Square Error (RMSE) dan Mean Absolute Percentage Error (MAPE) obtained in sensor calibration indicate small data errors from sensors. The system design was made with a database design and entity relationship diagram. The system was successfully implemented in multi-greenhouse which two greenhouse standard peak type and a plant factory. Based on the results of System Usability Scale (SUS) test, the system received SUS score of 75.67, which means that system was acceptable to users and included good category in class B. The conclusion of this research was microclimate monitoring system in multi-greenhouse has been successfully implemented using electronic devices based on IoT that can be accessed by users on a web server.
Keyword: ESP32, Internet of Things, rumah tanaman, sensor lingkungan, sistem informasi

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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