Vol. 21 No. 1 (2023): Spektrum Industri - April 2023

This issue contains articles from different countries South Korea, Thailand, Malaysia, Iran, and Indonesia. The authors/co-authors are from various institutions such as Universitas Pembangunan Nasional Veteran Yogyakarta, Diponegoro University, Universitas Muhammadiyah Sorong, Universitas Islam Indonesia, Politeknik ATK Yogyakarta, Balikpapan University, IST Akprind, Universitas Muria Kudus, Universitas Gadjah Mada, Pusan National University, University Teknikal Malaysia Melaka, Asian Institute of Technology, Shahid Beheshti University of Medical Sciences, Tehran University of Medical Sciences, and Mehran Education Office.