If I describe my biggest strength in one sentence, I would say I have practical hand-on experiences in a wide range of technical fields. Also while carrying out several projects with universities for government and companies, I could have oppotunities to work with various and diverse people. Helping and being helped, they are my precious human network asset.Belows are summary of technical fields I have been involved in- Photonics: Diffraction theory, design and optimization of devices and components , Diffractive Optical Element, Computer Generated Hologram, meta-material, Laser- Optics: imaging optics, non-imaging(illumination) optics, beam shaping, various optical experiments- Plasma engineering: Chemical Vapor Deposition, Plasma parameter measurement, vacuum system- Numerical analysis: electromagnetic full vectorial 3D simulation(Finite Element Method, Finite Difference Method), optimization, imaing processing- Software: C, C++, C#, Python, dart, flutter, matlab, Windows and mobile(Android/iOS) programming- Electronics: Circuit design, artwork, manufacturing, embedded system- Firmware: C, C++, AVR, STM