A chat system with knock-on-the-door sound and shadow. - Keishi Suzumura; Natsuko Hikage; Yuko Murayama (Computer Supported Acitivity Coordination, 2004)

An Anshin Model for the Evaluation of the Sense of Security. - Yuko Murayama; Natsuko Hikage; Carl Hauser; Basabi Chakraborty; Norihisa Segawa (HICSS, 2006)

The Structure of the Sense of Security, Anshin. - Yuko Murayama; Natsuko Hikage; Yasuhiro Fujihara; Carl Hauser (CRITIS, 2007)

Exploratory survey on an Evaluation Model for a Sense of Security. - Natsuko Hikage; Yuko Murayama; Carl Hauser (SEC, 2007)