title: Preface: Proceedings of the 12th International Conference on Ion Sources. Jeju, Korea, 26-31 August 2007.
authors.affiliation: Department of Nuclear Engineering, Seoul National University, Seoul, Korea. yhwang@snu.ac.kr
authors.forename: Y S
authors.initials: YS
authors.lastname: Hwang
authors.forename: B H
authors.initials: BH
authors.lastname: Choi