[1] Univ Gadjah Mada, Dept Mech & Ind Engn, Balaksumur, Indonesia
[2] Inst Teknol Bandung, Sch Elect Engn & Informat, Bandung, Indonesia
[3] Heriot Watt Univ, Ctr Logist & Sustainabil, Edinburgh Business Sch, Edinburgh, Scotland
[4] Univ Edinburgh, Edinburgh, Scotland
[5] Coventry Univ, Ctr Business Soc, Coventry, England