@article{weko_10410_1, author = "TOMIYASU,Masato and MORIMOTO,Keita and IGUCHI,Akito and TSUJI,Yasuhide", title = "A Study on Function-Expansion-Based Topology Optimization without Gray Area for Optimal Design of Photonic Devices", journal = "IEICE Transactions on Electronics", year = "2020", volume = "103", number = "11", pages = "560--566" }