Preface International Joint Conference on Science and Technology (IJCSE) 2020 was successfully held on October 3, 2020 at Universitas Negeri Surabaya, Surabaya, Indonesia. This conference features three international conferences organized by Universitas Negeri Surabaya including the 3rd International Conference on Vocation Education and Electrical Engineering (ICVEE), the 4th Mathematics, Informatics, Science and Education International Conference (MISEIC), and the 2nd International Conference on Research and Academic Community Services (ICRACOS). The joint conference was completely conducted online using Zoom as a platform. This event was also broadcasted live via an official YouTube channel of Universitas Negeri Surabaya. Through this scientific forum, Universitas Negeri Surabaya invited scientists, education experts, practitioners, and students all over the world to share and discuss their ideas, research findings, and issues about relevant topics, as well as to build scientific networks. This event shows the the commitment of Universitas Negeri Surabaya in supporting research activities of the community.

A total of 330 papers were submitted to IJCSE 2020. The papers have various topics including electrical, electronics, telecommunication, instrumentation and control, informatics engineering, pure and applied mathematics, science and technology, computer science, and education in mathematics, science, computer science, and engineering. After subsequent reviews on the content, format, and language, 77 papers were selected to be published in this proceeding. The authors of the selected papers came from three different countries, namely Pakistan, Taiwan, and Indonesia. The rest of the papers were selected to be published elsewhere or rejected.

We would like express our best gratitude to keynote and invited speakers for their invaluable contribution and worthwhile ideas shared in the conference. We would also thank to all authors for their contribution to this proceeding as well as our reviewers for their constructive comments and suggestions to improve the quality of the presented papers. The organizing and editorial committee of IJCSE 2020 hopes that the presented papers can serve a reference for the relevant topics and you can enjoy reading this volume of the proceeding.