How to write SoPs

https://www.cs.umd.edu/grad/writing-statement-of-pupose
http://grad.berkeley.edu/admissions/apply/statement-purpose/
http://www.uni.edu/~gotera/gradapp/stmtpurpose.htm
http://alumnus.caltech.edu/~natalia/studyinus/guide/statement/link4.htm

In your SoP, describe in detail what research experience and technical skills you have as well as your research interests.

Your SoP must state what projects you would like to work on and why you want to work here. Please be specific about your research interests (simply saying “I am interested in HCI and ubiquitous computing” is not anything at all). I am generally less excited with emails or SoPs that only contain generic statements.

In addition, please share with me three accomplishments you are most proud of. They are not limited to academic papers, and anything that demonstrates your technical capabilities would work. Examples are: artwork portfolios, mobile apps you publish in a market, hackathon outcomes (not awards. I am more interested in what you built.), and any artifact you created.


From HCI: 
Tokyo: Prof. Koji Yatani http://yatani.jp/#Professional
Canada: Prof. Khai N. Truong http://www.cs.toronto.edu/~khai/#contact