Making and testing prototypes is very important in developing a product. This is very important to do to minimize errors that may occur when the product has been released to end-users. There is research that discusses problems and determines the design of solutions for ordering creative gifts using design thinking. In this research, the focus is on problem space design thinking which includes empathize, define, and ideate processes with the result of the solution design in the form of a wireframe. The wireframe is made in two versions which are then carried out A/B testing to get user views regarding the design that will be used. The design of the chosen solution can be developed to the prototype stage. The focus of this research lies in solution space design thinking, namely making prototypes based on research results in the form of wireframes and conducting testing. Prototypes are important to be made as a communication tool between developers and end-users. With a prototype, end-users can directly test it without having to wait for the final product to be released, so that they can find out existing deficiencies as early as possible. The prototype was created using the Figma application. After the prototype is successfully made, the prototype is tested using the HEART Framework which focuses on aspects of Happiness and Task Success. The target set for the two aspects of the assessment is to achieve a very high level of usability level. Tests are carried out on all users, namely owner, admin, and customer. From the test results, the reliability criterion value is 0.87, which means the level of usability reaches a very high level. In other words, what has been targeted, can be achieved in this test. For the next stage, the prototype can be developed into a finished product so that its benefits can be felt directly by end-users.
This study has developed a CNN model applied to classify the eight classes of land cover through satellite images. Early detection of deforestation has become one of the study’s objectives. Deforestation is the process of reducing natural forests for logging or converting forest land to non-forest land. The study considered two training models, a simple four hidden layer CNN compare with Alexnet architecture. The training variables such as input size, epoch, batch size, and learning rate were also investigated in this research. The Alexnet architecture produces validation accuracy over 100 epochs of 90.23% with a loss of 0.56. The best performance of the validation process with four hidden layers CNN got 95.2% accuracy and a loss of 0.17. This performance is achieved when the four hidden layer model is designed with an input size of 64 × 64, epoch 100, batch size 32, and learning rate of 0.001. It is expected that this land cover identification system can assist relevant authorities in the early detection of deforestation.
CubeSat attracts many researchers due to its low production and deployment cost. One of the application is implemented in low data rate communication or machine to machine (M2M) with IoT devices in remote areas such as islands, forests, and mountains. In this study, a CubeSat receiver for IoT communication in remote areas has been developed and realized. A LoRa SX1276 chip is used for processing passband signals captured by the antenna. The device has a amplifier gain of 20.92 dB, 390 mW power consumption, and operating frequency of 923 MHz. The developed CubeSat is expected to provide a low bit rate of 5468.750 bps for SF 7 and 292.969 for SF 12 , the receiver serves as a concentrator for monitoring devices in rural areas.
Abstrak -Keberhasilan suatu misi satelit nano sangat bergantung kepada keandalan Electrical Power System (EPS) untuk menjaga subsistem-subsistem pada satelit nano agar tetap berfungsi. Oleh karena itu, dibutuhkan sebuah pengendalian distribusi daya yang efektif. Penelitian ini menjelaskan tentang bagaimana cara pendistribusian daya listrik yang efektif dan sesuai dengan kondisi satelit nano ketika terkena sinar matahari atau ketika kondisi gelap pada saat mengorbit di luar angkasa. Untuk menjelaskan hal tersebut, dilakukan simulasi dan analisis pada perancangan modul power management EPS yang terdiri dari rangkaian boost converter LT3757 dan battery charger IC LT3652. Hasil simulasi menunjukkan bahwa pada saat kondisi terang sistem akan mencatu daya beban menggunakan daya masukan panel surya yang sebelumnya telah melewati komponen boost converter (12 Volt), sekaligus mengisi daya batere hingga terisi penuh (7,4 Volt). Namun, pada saat kondisi gelap sistem akan mencatu beban dengan daya yang dihasilkan oleh batere (7,4 Volt).Kata kunci -EPS, satelit nano, power management, boost converter, battery charger IC Abstract -The success of nanosatellite mission is depended on the reliability of the Electrical Power System (EPS) to ensure the subsystems on the nanosatellite working properly. Therefore, an effective power distribution control is required. This research will explain how to distribute electrical power effectively to the subsystems according to the condition of the nanosatellite (sunlight or eclipse). To illustrate this, a simulation and analysis of the EPS power management module design consisting the LT3757 boost converter and LT3652 battery charger were performed. From the simulation results, it will be seen that when the nanosatellite is exposed to the sun, the system will distribute the power to the load using the input power from the solar panel that has passed the boost converter component (12 Volt), while charging the battery until it's fully charger (7.4 Volt). But during the eclipse phase the system will supply the load with the power generated by the battery (7.4 Volt).
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