I uploaded the modified version of make15minSegment.py to the github https://github.com/gw-detchar/tools/blob/master/Segments/Script/. (renamed as make15minSegment_igwn.py)
The segment lists seemed to be generated properly. Summarized in https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=14838.