When you see/hear someone speaking in public, you sometimes start considering the speaker to be charismatic all of sudden. Wait! What makes the audience get speaker's charisma? What kind of phonetic and gestural techniques are employed by charismatic speakers? Here is the link to my [Hiro's] study with Dr Tamara Rathcke at the University of Kent, UK. By referring to various sorts of academic research, Kotobaax will give you efficient and effective practices for the development of your speech and presentation skills!
You can read the paper via the website of Kotobaax (The PDF at the beginning) -> http://www.kotobaax.com/teaching.html
If you or your company (university, school, organisation etc.) would like a workshop for public speaking, don't hesitate to contact Hiro at Kotobaax. We also offer 8 to 12-week courses and one-to-one speech training.