Microsoft Word - Article 2 - Editorial.docx ACTA IMEKO December 2013, Volume 2, Number 2, 2 www.imeko.org ACTA IMEKO | www.imeko.org December 2013 | Volume 2 | Number 2 | 2 Editorial Paul Regtien Measurement Science Consultancy (MSC), Julia Culpstraat 66, 7558 JB Hengelo (OV), The Netherlands Section: EDITORIAL Citation: Paul Regtien, Editorial, Acta IMEKO, vol. 2, no. 2, article 2, December 2013, identifier: IMEKO-ACTA-02 (2013)-02-02 Editor: Paolo Carbone, University of Perugia Copyright: © 2013 IMEKO. This is an open-access article distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited Corresponding author: Paul Regtien, e-mail: paul@regtien.net This issue of Acta IMEKO comprises the second series of articles based on papers presented at the XX IMEKO World Congress, Busan, Republic of Korea, 9-12 September, 2012. This time Acta IMEKO includes the extended and updated versions of papers from TC2 (Photonics), TC11 (Metrological Infrastructures), TC18 (Measurement of Human Functions), TC21 (Mathematical Tools for Measurements) and TC22 (Vibration Measurement), illustrating the wide range of facets encompassing the field of metrology. The issue starts with five research papers on mathematical tools (TC21), followed by four papers about vibration measurements (TC22), two papers on photonics (TC2) and one article on measuring human functions (TC18). An essential aspect of metrology is the international cooperation with respect to standardization and calibration. Acta IMEKO has introduced a section on technical notes, offering a position for contributions on metrological infrastructures and other important aspects of metrology, next to the section with regular research papers. The two technical notes in this issue are about the development of metrological infrastructures (TC11). We like to thank all those who have contributed to this issue: authors, reviewers, layout editors and journal managers. Special thanks go to the Section Editors Bernhard Zagar (TC2), Mladen Borsic (TC11), Yasuharu Koike (TC18), Alistair Forbes and Franco Pavese (TC21) and Gustavo Ripper (TC22). We hope you enjoy this issue.