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All Journal ComTech: Computer, Mathematics and Engineering Applications Joined Journal (Journal of Informatics Education)
Putri Kartika Sari
Universitas Islam Indonesia, Yogyakarta
Computer Science & IT Control & Systems Engineering Education Engineering Mathematics Other

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The Improvement of Flip (2,2) Visual Cryptography Images Using Two Key Images Dewi, Ratna; Sari, Putri Kartika
ComTech: Computer, Mathematics and Engineering Applications Vol 7, No 3 (2016): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v7i3.2501

Abstract

The Flip (2, 2) Visual Cryptography (FVC) is one of the techniques used to encrypt the two secret images into two dual purpose transparencies. The two transparencies can be sent to the objective person. The first secret images can be obtained by stacking the two transparencies and the second secret images can be obtained by stacking the one transparency with the flipping other transparency. Unfortunately, the result decryption processes still have noise and the quality of decrypted secret image is not as same as original secret image. This article proposed the new algorithm to improve the quality of decryption secret image. In this process, the two secret images from decryption process were compared with the two original secret images. The different values of each pixel, which was counted from subtraction of decryption image and original secret images, will be inserted to the two key images. The experimental results of this improvement have a good similarity. The noise in decryption process can be eliminated so the two secret images reconstruction similar to the original secret images.
RANCANG BANGUN SISTEM MONITORING MUATAN BALON ATMOSFER PADA KOMPETISI MUATAN BALON ATMOSFER TAHUN 2019 LEMBAGA PENERBANGAN DAN ANTARIKSA NASIONAL (LAPAN) KABUPATEN GARUT Sari, Putri Kartika; Pratama, Afis; Rani, Handini Arga Damar
Joined Journal (Journal of Informatics Education) Vol 3 No 1 (2020): Volume 3 Nomor 1 (2020)
Publisher : Universitas Ivet

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/joined.v3i1.1097

Abstract

Tujuan penelitian ini adalah membuat suatu rancangan sistem monitoring yang dapat digunakan untuk menampilkan dan menyimpan data profil vertikal atmosfer secara real time dan efisien bagi pengguna dengan memanfaatkan alat ukur yang dibangun dari beberapa sensor. Penelitian Research and Development (R&D), dengan menggunakan metode pengembangan perangkat lunak Waterfall, yang meliputi: Communication, Planning, Modeling, Construction, dan Deployment. Sistem yang telah dirancang kemudian diuji dengan aspek usability. Subjek penelitian ini adalah pengamat parameter atmosfer atau juri utama KOMBAT 2019 yang berjumlah 3 orang, sekaligus sebagai responden pengujian usability. Hasil penelitian ini adalah (1). Sistem monitoring muatan balon atmosfer mampu mendeteksi suhu, kelembapan, tekanan udara, ketinggian dalam bentuk grafik, serta dapat mendeteksi arah angin, kecepatan angin dan juga letak lokasi dari koordinat lintang dan bujur. (2). Sistem monitoring ini telah melalui pengujian terhadap tingkat kualitas sistemnya pada aspek usability, yang memperoleh persentase sebesar 90% (sangat baik) dalam memonitoring muatan balon atmosfer.   Kata kunci: Sistem Monitoring, Muatan Balon Atmosfer, 3DR Radio Telemetry
Co-Authors Afis Pratama, Afis Handini Arga Damar Rani Ratna Dewi