List of Articles SNR Open Access Article Abstract Page Full-Text 1 - Investigation of Effective Parameters for Improvement of OSNR and Increasing of the Channel Capacity in Optical Communication Systems Majid Malekian Hossein Emami Mohsen Ashourian Open Access Article Abstract Page Full-Text 2 - Presenting a New Steganography Method Based on Wavelet Transform in Gray Image Vahidreza Soltaninia Saeed Talati Seyed Mahdi Khatmi Kazem Ghaffari 10.30486/mjtd.2023.1983555.1031 Open Access Article Abstract Page Full-Text 3 - Audio Signal Encryption Based on Permutation Relations and Residue Number System Fereshteh Ghanbari Adivi Mohammad Mehrnia