 
                     
                    
                            S1
                            ITB, Bandung                            - Indonesia                            
                            2002                        
                            S2
                            Toyohashi Univ. of Technology, Aichi                            - Jepang                            
                            2006                        
                            S3
                            National Univ. of Singapore, Kent Ridge                            - Singapura                            
                            2012