YUCHEN LIAN PhD candidate / guest Name Y. LIAN Telephone +31 71 527 7050 E-mail y.lian@liacs.leidenuniv.nl PhD candidate / guest Science Leiden Inst of Advanced Computer Science Work address Snellius Niels Bohrweg 1 2333 CA Leiden Room number 126 Contact +31 71 527 7050 y.lian@liacs.leidenuniv.nl