- Japan🇯🇵
- I was born and am living in Japan.
- Austria🇦🇹
- Innsbruck — Ubicomp 2007 (September 2007)
- Belgium🇧🇪
- Antwerpen — Visiting to BellLab@Antwerpen (February 2016)
- Canada🇨🇦
- Vancouver — HCII2017 (July 2017)
- China🇨🇳
- Beijing — UCS2009 (August 2009), UbiComp2011 (September 2011), MobiQuitous2012 (December 2012)
- Xi’an — UIC2010 (October 2010)
- Macau — PhoneCom 2012 (June 2012)
- Hangzhou — Visiting to a company’s lab. (March 2016)
- Cyprus🇨🇾
- Nicosia — SAC 2004 (March 2004)
- Pafos, Limassol, and Larnaca — after SAC 2004 (March 2004)
- Czech Republic🇨🇿
- Hradec Králové —AMIF2009 (September 2009)
- Prague — On the way to AMIF2009 (September 2009)
- Denmark🇩🇰
- Copenhagen —Wedding trip (May 2007)
- Finland🇫🇮
- Helsinki — IST Event 2007 (November 2006), Wedding trip (May 2007), Pervasive2010 (May 2010), Personal trip (December 2011), Transit from Oulu to Tokyo (August 2017)
- Oulu — Research Visit (October-December 2006, September 2007, January, March, and November 2011, September and November 2012), Persuasive 2008 (June 2008), IWSSS 2017 (August 2017)
- Rovaniemi — Personal trip (November and December 2011)
- Saariselkä and Ivalo — Personal trip (December 2011)
- France🇫🇷
- Paris —On the way to MobiSys’05@Florence (May 2015)
- Germany🇩🇪
- Munich — Pervasive 2005 (May 2005)
- Ulm — IE07 (September 2007)
- Ireland🇮🇪
- Dublin — Pervasive 2006 (May 2006)
- Italy🇮🇹
- Milan and Rome — On the way to SAC 2004 (March 2004)
- Capri Island — AVI 2012 (May 2012)
- Napori — On the way to AVI 2012 @ Capri Island (May 2012)
- Florence — MobiSys 2015 (May 2015)
- Netherlands🇳🇱
- Schipol airport — Just for transit to Helsinki (May 2010), to Milan (May 2012), to Zurich (September 2013) and to Florence (2015)
- Eindhoven — TEI’16 (February 2016)
- Norway🇳🇴
- Oslo — Wedding trip (May 2007)
- Bergen — Wedding trip (May 2007)
- Poland🇵🇱
- Warsaw — Just transit to London (September 2019)
- Singapore🇸🇬
- Singapore City — UbiComp’18 (October 2018)
- South Korea🇰🇷
- Seoul — APCHI 2008 (July 2008), Ubicomp 2008 (September 2008), ISWC2010 (October 2010), DCA2012 (December 2012), ISAAC2013 (November 2013),
- Busan — FutureTech2010 (May 2010)
- Gwangju — AFMS10 (December 2010)
- Gangeung — DCA2012 (December 2012)
- Jeju Island — Multimedia Symp. 2nd (December 2013)
- Sweden🇸🇪
- Stockholm — Wedding trip (May 2007)
- Västrås — COMPSAC 2014 (July 2014)
- Switzerland🇨🇭
- Zurich — UbiComp’13 (September 2013)
- Taiwan🇹🇼
- Taichung — SUTC 2008 (June 2008)
- Taipei — Visit to NTU (June 2008)
- Thailand🇹🇭
- Bangkok — ICT-ISPC 2012 (April 2012)
- United Kingdom🇬🇧
- London — UbiComp’19 (September 2019)
- Windermere — Lancaster-Waseda Ph.D Workshop (Septermber 2009)
- Lancaster — Visit to Lancaster Univ. (September 2009)
- Edinburgh — Visit to Univ. of Edinburgh (September 2010)
- Dundee — “East Meets West” workshop (September 2010)
- USA🇺🇸
- Spokane — ABC 2019 (May/June 2019)
- San Francisco — JavaOne 98, 2000, 2002, Business visit (November 1999, January and March 2000)
- Seattle — Ubicomp 2003 (September 2003) and Just transit to Spokane (2019)
- Santa Fe — SAC 2005 (March 2005)
- Pittsburgh — DMS2014 (August 2014)
- Las Vegas — HCII 2013 (July 2013)
- Massachusetts — Visit to MIT (September 2003), DMS 2008 (September 2008)
- Detroit — Visit to an ITS exhibition (May 2001)
- Illinois — Business visit (March 1997)
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