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All Journal Ihsan: Jurnal Pengabdian Masyarakat Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences Jurnal Ilmu Komputer dan Sistem Informasi
Gunawan Gunawan
Lecturer In Universitas Muhammadiyah Sumatera Utara, Medan
Religion Arts Humanities Computer Science & IT Economics, Econometrics & Finance Education Library & Information Science Social Sciences

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Pelatihan Fardu Kifayah Dan Muballigh Di Pimpinan Ranting Muhammadiyah Bandar Khalipah Muhammad Qorib Qorib; Gunawan Gunawan
IHSAN : JURNAL PENGABDIAN MASYARAKAT Vol 1, No 1 (2019): Jurnal Ihsan (April)
Publisher : University of Muhammadiyah Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (178.957 KB) | DOI: 10.30596/ihsan.v1i1.3296

Abstract

In this service is expected to form a concept of guidance to the Muslim community, as Muhammadiyah's next generation who can understand about fardu kifayah. As well as making a simple generation that can prosper, the values of Islam in society. In this training, participants will be able to understand and master about fardu kifayah, which can be developed in society, and teach it back to the public about the real fardhu kifayah. As well as giving birth to talented young da'i, in understanding the true religious knowledge. Therefore, in this dedication we want the future of the generation that will continue the struggle of Muhammadiyah, to educate the Muslim community, and continue the dakwah of muhammadiyah about fardu kifayah which is now a lot of deviations everywhere.
The Influence of Transformational Leadership, School Culture and Work Motivation on School Effectiveness in Junior High School in Medan Gunawan Gunawan
Budapest International Research and Critics Institute (BIRCI-Journal): Humanities and Social Sciences Vol 3, No 1 (2020): Budapest International Research and Critics Institute February
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birci.v3i1.824

Abstract

This research is a quantitative study that examines the participatory leadership model, school culture and motivation with school effectiveness with path analysis techniques. The respondents of this study were 343 teachers in Junior High Schools in Medan from 2,140 teachers in 44 State Junior High Schools. The findings of this study statistically show that simultaneously there is a positive and significant influence of transformational leadership and school culture on the work motivation of Junior High School in Medan teachers, where the effect is 5.9%. Likewise transformational leadership, school culture and work motivation have a significant and significant influence on the effectiveness of State Junior High Schools in Medan, which amounted to 13.7%.
The Implement’s Steganografi LSB dan Kriptografi AES-256 untuk Pengamanan Data Citra Digital Muhammad Haris; Dedi Irawan; Gunawan Gunawan; Mahardika Abdi Prawira Tanjung
Jurnal Ilmu Komputer dan Sistem Informasi Vol. 5 No. 2 (2025): Mei 2026
Publisher : LKP Unity Academy

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70340/jirsi.v5i2.420

Abstract

Digital data security has become a critical issue in the digital transformation era, particularly in the exchange of digital images that are vulnerable to interception and manipulation by unauthorized parties. This study aims to implement a layered data security method by combining Advanced Encryption Standard (AES) 256-bit cryptography and Least Significant Bit (LSB) steganography on PNG-format digital images. The approach used is encrypt-then-embed, where the secret message is first encrypted using AES-256 in CBC mode, then the ciphertext is embedded into the cover image pixels through LSB bit substitution. Testing was conducted on five test images with varying resolutions (256×256 to 1024×768 pixels) using Peak Signal-to-Noise Ratio (PSNR), Mean Squared Error (MSE), entropy, avalanche effect, and computation time metrics. The test results show an average PSNR of 70,58 dB and MSE of 0.11, indicating excellent visual quality of the stego images. Security analysis shows an average avalanche effect of 50.29%, approaching the ideal value of 50%, and stego image entropy approaching 7.0545 bits/pixel. The computation time for encryption and embedding processes ranges from 0,005847 to 0,006078 seconds. The combination of AES-256 and LSB has proven effective in providing layered security: AES-256 ensures data confidentiality, while LSB conceals the message existence within the image without significant visual degradation.
Co-Authors Dedi Irawan Muhammad Haris Muhammad Qorib