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All Journal Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi) Jurnal Rekayasa Material, Manufaktur & Energi Rang Teknik Journal Ensiklopedia Education Review
Aggrivina Dwiharzandis
Dosen - Universitas Muhammadiyah Sumatera Barat
Aerospace Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Languange, Linguistic, Communication & Media

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Perancangan dan Analisis Kinerja Steganography pada MPEG SAOC Menggunakan Improved Spread Spectrum Aggrivina Dwiharzandis; Amirul Luthfi; Ikhwana Elfitri
Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi) Vol 3 No 3 (2019): Desember 2019
Publisher : Ikatan Ahli Informatika Indonesia (IAII)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (853.373 KB) | DOI: 10.29207/resti.v3i3.1356

Abstract

Object-based audio technology is important for audio reproduction because of providing the users with an ability to change the audio composition. As a result, MPEG Spatial Audio Object Coding (SAOC) as an international standard for encoding object-based audio has been widely used in many applications. However, the object-based audio transmission scheme is different than conventional audio transmission technology, so the use of steganography in MPEG SAOC needs to be further studied. In this work, a steganography technique has been developed based on Improved Spread Spectrum (ISS). There are two embedding configurations used in this study: embedding on MPEG SAOC audio objects and embedding on MPEG SAOC downmix signals. The performance of these two embedding configurations was analyzed by measuring ISS embedding capacity. As a comparison to the ISS method on channel-based audio, the ISS is also applied to Advanced Audio Coding (AAC). Based on the experiments, the embedding capacity of both proposed configurations varies depending on the bandwidth of audio signals. However, the downmix signal has a capacity of 20% higher than the audio objects. Moreover, the ISS embedding capacity on the MPEG SAOC downmix signal is similar to the embedding capacity on the AAC.
STEGANOGRAFI METODE LEAST SIGNIFICANT BIT (LSB) PADA MPEG SPATIAL AUDIO OBJECT CODING Wirda Sri Farhani; Aggrivina Dwiharzandis
Rang Teknik Journal Vol 5, No 2 (2022): Vol. 5 No. 2 Juni 2022
Publisher : Fakultas Teknik Universitas Muhammadiyah Sumatera Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (260.35 KB) | DOI: 10.31869/rtj.v5i2.3260

Abstract

Salah satu manfaat dari perkembangan audio yaitu dengan menyisipkan suatu pesan rahasia dalam media digital. Dengan menggunakan teknik steganografi, yang akan menyembunyikan pesan atau data dari pengirim ke penerima. Dengan menggunakan metoda LSB akan digabungkan dengan MPEG SAOC. Dengan menggunakan MPEG SAOC yang memiliki kemampuan mereproduksi audio multikanal, sehingga mampu dikombinasi dengan steganografi menggunakan LSB. Maka akan dihitung jumlah karakter, SNR dan ODG yang dapat ditumpangi dari beberapa audio yang sudah ditetapkan. Berdasarkan hasil pengujian, Metode Least Significant Bit (LSB) pada MPEG Spatial Audio Object Coding (SAOC) menghasilkan kualitas suara yang cukup baik karena nilai SNR masing-masing audio tersebut diatas 20 dB. Dengan semakin besarnya nilai Y maka kapasitas penampungan karakter pada setiap audio akan semakin kecil, begitu juga sebaliknya.
PENGARUH PENERAPAN MODEL PEMBELAJARAN TIPE MAKE A MATCH TERHADAP HASIL BELAJAR MATERI DASAR-DASAR SINYAL VIDEO Aggrivina Dwiharzandis
Ensiklopedia Education Review Vol 3, No 3 (2021): Volume 3 No.3 Desember 2021
Publisher : Lembaga Penelitian dan Penerbitan Hasil Penelitian Ensiklopedia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33559/eer.v3i3.1268

Abstract

Penelitian bertujuan untuk mengetahui perbedaan hasil belajar model pembelajaran kooperatif tipe Make A Match dengan model pembelajaran langsung. Pengambilan sampel menggunakan teknik probability sampling dengan simple random sampling, dimana pada kelas kontrol menerapkan model pembelajaran langsung dan kelas eksperimen menerapkan model pembelajaran kooperatif. Teknik pengumpulan data diambil dari nilai akhir hasil belajar, kemudian dianalisis untuk uji homogenitas, uji normalitas dan uji hipotesis. Dari hasil penelitian kelas eksperimen mendapatkan nilai rata-rata 85.53, sedangkan kelas kontrol mendapatkan nilai rata-rata 79.67. Hasil perhitungan hipotesis pada taraf signifikan α=0,05 didapatkan thitung> ttabel yaitu (1,940 > 1,701), karena thitung besar dari ttabel, maka hipotesis nihil (H0) ditolak dan hipotesis alternatif (Ha) diterima. Berdasarkan perhitungan persentase hasil belajar kelas eksperimen dan kelas kontrol, terdapat pengaruh hasil belajar dengan menerapakan model pembelajaran kooperatif tipe sebesar 7,35%. Ini berarti hasil belajar siswa dengan menerapkan model pembelajaran kooperatif tipe Make A Match lebih baik dibandingkan dengan model pembelajaran langsung. Kata kunci: make a match, model pembelajaran, eksperimen, kontrol, hasil belajar
Perancangan Aplikasi Berbasis Web Sebagai Alat Pendukung Keputusan Dalam Memilih Ac Hemat Energi Maimuzar .; Ruzita Sumiati; Haris .; Desmarita Leni; Aggrivina Dwiharzandis
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.16255

Abstract

The increase in global energy demand has driven the need for efficient solutions in selecting energy-efficient air conditioners (ACs). This research focuses on designing a web-based application as a decision support tool for choosing energy-efficient ACs. Energy-efficient labeled AC data is obtained from the Directorate General of New and Renewable Energy and Energy Conservation (EBTKE) website. This database is processed according to the system's requirements, where each AC brand is evenly represented to prevent dominance by a few brands. There are 11 different AC brands in this dataset, and each brand has 10 data samples. The web-based application is developed using the Python programming language with the Streamlit framework. This application allows users to compare various AC brands by considering power, annual energy consumption, efficiency value, and electricity cost. In the application design, users can select AC brands according to their needs, set the operating duration, choose the AC efficiency level, and select the inverter AC type. The application presents comparisons in the form of bar charts, making it easy for users to understand the differences in AC characteristics. The average results from the efficiency comparison of each AC brand reveal that Daikin achieves the highest efficiency at 16.36 Energy Efficiency Ratio (EER), while the GREE brand has the lowest efficiency at 5.83 EER. This application can assist consumers and industrial AC stakeholders in making decisions to choose energy-efficient ACs according to their needs.
Co-Authors Amirul Luthfi, Amirul Desmarita Leni Elfitri, Ikhwana Haris Haris Maimuzar Maimuzar Ruzita Sumiati Wirda Sri Farhani