Projects:
1. Microscale,
Axial-flux- Permanent Magnet Generator
à
Develop integrated microsystems that
are capable of generating electrical power and that can be driven by either
cold (i.e., pressurized) or hot (e.g., combustion products) gases
2. Micro Power Convertor à
Develop an integrated power converter
using power inductors with micromachined laminations that could meet
multi-watt conversion specifications such as micro fuel cells, micro power
generator and portable electronics
Publications:
Journal
1.
C.-H. Ji, F.
Herrault, P. Hopper, P. Smeys, P. Johnson, and M. G. Allen, “Electroplated Metal Buried
Interconnect and Through-Wafer Metal-Filled Via Technology for
High-Power Integrated Electronics,” accepted for publication in IEEE Transactions on Advanced Packaging.
2.
F. Herrault, C.-H. Ji, and M. G. Allen, “Ultraminiaturized, High-Speed, Permanent
Magnet Generators for Milliwatt-Level Power Generation,” Journal of
Microelectromechanical Systems, Vol. 17, No. 6, pp. 1376-1387, 2008. (PDF)
3.
C.-H. Ji, F.
Herrault, and M. G. Allen, “Metallic Buried Interconnect Process for Through-Wafer
Interconnection,” Journal of Micromechanics and
Microengineering, Vol. 18, 085016
(10pp), 2008. (PDF)
4.
C.-H. Ji,
K.-C. Song, M. Choi, S.-C. Kim, J.-U. Bu, and H.-J. Nam, “Electromagnetic
Two-Dimensional Scanner Using Radial Magnetic Field,” Journal of Microelectromechanical Systems, Vol. 16, No. 4, pp. 989-996, 2007. (PDF)
5.
J.-H.
Park, H.-C. Lee, Y.-H. Park, Y-D. Kim, C.-H. Ji, J. Bu, and H.-J. Nam, “A
Fully Wafer-Level Packaged RF MEMS
Switch with Low Actuation Voltage Using a Piezoelectric Actuator,” Journal
of Micromechanics and Microengineering, Vol. 16, pp. 2281-2286, 2006. (PDF)
6.
C.-H. Ji,
M. Choi, S.-C. Kim, S.-H. Lee, and J.-U. Bu, “Performance
of a Raster Scanning Laser Display System Using Diamond Shaped Frame
Supported Micromirror,” IEEE
Photonics Technology Letters, Vol. 18, No. 16, pp. 1702-1704, 2006. (PDF)
7.
C.-H. Ji, M.
Choi, S.-C. Kim, S.-H. Lee, S.-H.
Kim, Y. Yee, and J.-U. Bu, “Electrostatic Scanning Micromirror with Diaphragm Mirror Plate and Diamond Shaped Reinforcement
Frame,” Journal of Micromechanics and Microengineering, Vol. 16, pp.
1033-1039, 2006. (PDF)
8.
C.-H. Ji, Y.
Yee, J. Choi, S.-H. Kim, and J.-U. Bu, “Electromagnetic 2x2 MEMS
Optical Switch,” IEEE Journal of Selected
Topics in Quantum Electronics, Vol. 10, No. 3, pp. 545-550, 2004. (PDF)
9.
T.-S. Lim, C.-H. Ji, Y. Yee, H. Kwon, C.-H.
Oh, and J.-U. Bu, “Electrostatic MEMS Variable Optical
Attenuator with Rotating Folded Micromirror,” IEEE Journal of Selected
Topics in Quantum Electronics, Vol. 10, No. 3, pp. 558-562, 2004. (PDF)
10. C.-H. Ji and Y.-K. Kim, “Electromagnetic Micromirror Array
with Single-Crystal Silicon Mirror Plate and Aluminum Spring,” Journal of Lightwave Technology,
Vol. 21, No. 3, pp. 584-590, 2003. (PDF)
11. C.-H. Ji, Y.-K. Kim, and G.-B. Chung, “Design and
Fabrication of Electromagnetic Micromirror with Bulk Silicon Mirror Plate
and Aluminum Spring,” Japanese Journal of Applied Physics, Vol. 39, Part 1, No.
12B, pp. 7138-7141, 2000.
Conferences
1.
B. C. Yen, F.
Herrault, K. J. Hillman, M. G. Allen, F. F. Ehrich, S. Jacobson, C.-H. Ji, J. H. Lang, H. Li, Z. S.
Spakovszky, and D. R. Veazie, “Characterization of A Fully-Integrated
Permanent-Magnet Turbine Generator,” Proc.
of PowerMEMS 2008 + microEMS 2008, pp. 121-124, 2008.
2.
S.-H. Kim, C.-H. Ji, P. Galle, F. Herrault, X.
Wu, J.-H. Lee, C.-A. Choi, and M. G. Allen, “An Electromagnetic Energy
Scavenger from Direct Airflow,” Proc.
of PowerMEMS 2008 + microEMS 2008, pp. 133-136, 2008.
3.
F. Herrault, C.-H. Ji, S.-H. Kim, X. Wu, and M.
G. Allen, “A Microfluidic-Electric Package for Power MEMS Generators,” Proc.
of IEEE Micro
Electro Mechanical Systems, MEMS 2008, pp. 112-115, 2008.
4.
X. Wu, S.-H.
Kim, C.-H. Ji, and M. G. Allen,
“A Piezoelectrically-Driven High Flow Rate Axial Polymer Microvalve with
Solid Hydraulic Amplification,” Proc.
of IEEE Micro
Electro Mechanical Systems, MEMS 2008, pp. 523-526, 2008.
5.
F. Herrault, C.-H. Ji, S. Rajaraman, R. H.
Shafer, and M. G. Allen, “Electrodeposited Metal Structures in High Aspect
Ratio Cavities Using Vapor Deposited Polymer Molds and Laser
Micromachining,” Transducers ’07,
pp.513-516, 2007.
6.
F. Herrault, C.-H. Ji, R. H. Shafer, S.-H. Kim
and M. G. Allen, “Ultraminiaturized Milliwatt-Scale Permanent Magnet
Generators,” Transducers ’07,
pp.899-902, 2007.
7.
C.-H. Ji,
S.-H. Ahn, K.-C. Song, H.-K. Yoon, M. Choi, S.-C. Kim, and J.-U. Bu,
“Dual-Axis Electromagnetic Scanning Micromirror Using Radial Magnetic
Field,” Proc. of IEEE Micro
Electro Mechanical Systems, MEMS 2006, pp. 32-35, 2006.
8.
C.-H. Ji,
S.-H. Kim, Y. Yee, M. Choi, S.-C. Kim, S.-H. Lee, and J.-U. Bu, “Diamond
Shaped Frame Supported Electrostatic Scanning Micromirror,” Transducers ‘05, pp. 992-995, 2005.
9.
C.-H. Ji,
Y. Yee, J. Choi, S.-H. Kim, and J.-U. Bu, “Latchable Electromagnetic 2x2
Photonic Switch for Low Power Operation,” Proc. of IEEE/LEOS
Optical MEMS, pp. 51-52, 2003.
10. T.-S. Lim,
C.-H. Ji, C.-H. Oh, Y. Yee, and J.-U. Bu, “Electrostatic MEMS Variable Optical Attenuator with Folded
Micromirror,” Proc. of IEEE/LEOS
Optical MEMS, pp. 143-144, 2003.
11. C.-H. Ji, Y. Yee, J. Choi, H.-H. Oh, and J.-U. Bu, “Latchable
Electromagnetic 2x2 MEMS Optical Switch,” Proc. of IEEE Micro
Electro Mechanical Systems, MEMS 2003, pp. 239-242, 2003.
12. C.-H. Ji, Y. Yee, J. Choi, and J.-U. Bu, “Electromagnetic
Variable Optical Attenuator,” Proc.
of IEEE/LEOS
Optical MEMS, pp. 49-50, 2002.
13. C.-H. Ji and Y.-K. Kim, “Addressable Electromagnetic
Micromirror Array with Single Crystal Silicon Mirror Plate and Aluminum
Spring,” Proc. of IEEE/LEOS
Optical MEMS, pp. 17-18, 2001.
14. C.-H. Ji and Y.-K. Kim, “Fabrication and Experiments on
Electromagnetic Micromirror Array with Bulk Silicon Mirror Plate and
Aluminum Spring,” Transducers ‘01,
pp. 1320-1323, 2001.
15. C.-H. Ji, Y.-K. Kim, and B.-K. Choi, “Design and
Fabrication of Electromagnetic Micromirror with Bulk Silicon Mirror Plate
and Aluminum Spring,” Proc. of IEEE/LEOS
Optical MEMS, pp. 97-98, 2000.
16. C.-H. Ji and Y.-K. Kim, “Design and Fabrication of
Magnetically Driven Micromirror with Large Angular Deflection,” Microprocesses and Nanotechnology 2000
Digest of Papers, pp. 132-133, 2000.
17. C.-H. Ji and Y.-K. Kim, “Design, Fabrication, and
Experiment of Micromirror with Aluminum Pin-joints,” Proc. of MOEMS ‘99, pp. 44-48, 1999.
18. C.-H. Ji and Y.-K. Kim, “Design and Fabrication of
Micromirror Array with Hidden Joint Structures,” Proc. of SPIE, Vol. 3513,
pp. 71-77, 1998.
19. C.-H. Ji and Y.-K. Kim, “Fabrication of Micro Mirror Array
with Hidden Joint Structures,” Proc.
of IEEE 6th International Conference on Emerging Technologies
and Factory Automation, ETFA ’97,
pp. 243-247, 1997.
20. C.-H. Ji, Y.-K. Kim, and B.-K. Choi, “Novel Micro Mirror
Array with Hidden Pin and Staples,” Proc.
of International Conference on Micromechatronics for Information and
Precision Equipment, MIPE ‘97,
pp. 755-758, 1997.
Patents
1.
T.-S. Lim and
C.-H. Ji, “Scanning
Micromirror,” Korea patent 0789574, Korea patent pending, 2008-0067064
2.
C.-H. Ji,
“Shutter Apparatus for Micro Camera,” Korea patent 0775211
3.
M.-H. Ha and C.-H. Ji, “Control apparatus for
focus of the camera and its manufacture method,” Korea patent pending,
2005-0112153
4.
C.-H. Ji,
“Micro Method for Manufacturing Scanning Micromirror,” Korea patent 0706319
5.
C.-H. Ji,
“Micro-mirror Device and Micro-mirror Device Array Using the Same,” Korea
patent 0743315, “Micro-mirror Device and Array Thereof,” U. S. patent pending,
2006-508821
6.
J-H. Choi,
S.-H. Kim, C.-H. Ji, and C.-H.
Oh, “Moving Control Apparatus and Method for Camera Lens of the Portable
Terminal,” Korea patent pending, 2005-059455
7.
S.-H. Kim,
J-H. Choi, and C.-H. Ji,
“Position Detection Apparatus of Camera Lens in the Mobile Terminal,” Korea
patent pending, 2005-060002
8.
C.-H. Ji,
“MEMS Scanning Micromirror and Dual-axis Electromagnetic MEMS Scanning
Micromirror Device,” Korea patent pending, 2005-045822
9.
J-H. Choi,
S.-H. Kim, C.-H. Ji, and J.-U.
Bu, “Small Form Factor Camera Module with a Mechanical Iris and Shutter,”
Korea patent pending, 2005-035062
10. S.-H. Kim, J-H. Choi, C.-H. Ji, S.-C. Kim, and J.-U. Bu, “Small Form Factor Camera
Module with a Mechanical Iris and Shutter,” Korea patent 0760544, U. S.
patent pending, 2006-404905
11. C.-H. Ji, S.-H. Lee, and Y. Yee, “Scanning Micromirror
Package, Manufacturing Method Thereof, and Optical Scanning Device
Thereby,” Korea patent 0772039, “Scanning Micro-mirror Package, Method for
Fabricating the Same, and Optical Scanning Device Employing the Same,” U.
S. patent pending, 2006-317109
12. C.-H. Ji, J.-H. Park, M.-H. Ha, S.-H. Kim, Y. Yee, and
J.-U. Bu, “Driving Unit for Movement of Lens,“ Korea patent 0762992, “Lens
Driving Device,” U. S. patent 7412157
13. T.-S. Lim,
C.-H. Ji, and Y. Yee, “Optical Attenuator,” Korea patent pending,
2003-026464
14. C.-H. Ji, Y. Yee, and S.-H. Kim, “Micro Actuator for
Controlling the Focal Length,“ Korea patent pending, 2003-039185, “Micro
Actuator for Controlling Focal Depth,” U. S. patent 7079329
15. C.-H. Ji, Y. Yee, and J.-U. Bu, “Electrostatic Dual Axis
Micro Mirror and Manufacturing Method Thereof,” Korea patent pending,
2002-057057
16. C.-H. Ji, Y. Yee, and J.-U. Bu, “Focal Length Control
Device of Optical Recorder/Player and Fabrication Method Thereof,” Korea
patent pending, 2002-065569
17. C.-H. Ji, Y. Yee, and J.-U. Bu, “Minute Structure
Assembling Optical Fiber,” Korea patent pending, 2002-067950
18. C.-H. Ji, Y. Yee, J. Choi, and S.-H. Kim, “Electromagnetic
Actuator for Reducing the Degeneration of Image Quality in Display
Systems,” Korea patent 0595519, “Device for reducing deterioration of image
quality in display using laser,” U. S. patent 7116017
19. C.-H. Ji, Y. Yee, and S.-H. Kim, “Scanning Micro-mirror
Actuated by Electrostatic Force, Manufacturing Method Thereof and optical
Scanning Device Using the Same,” Korea patent 0619696, “Scanning Device and
Fabrication Method Thereof,” U. S. patent pending, 2005-205355
20. C.-H. Ji, Y. Yee, and S.-H. Lee, “Raster Scanning Display
System,” Korea patent 0636347, U. S. patent pending, 2005-205860
21. C.-H. Ji, Y. Yee, and S.-H, Kim, “Scanning Micro-mirror,”
Korea patent 0636348
22. C.-H. Ji, and Y. Yee, “Electromagnetic MEMS Scanning Micromirror and Optical Scanning Device
Thereby,” Korea patent 0644896, “Electromagnetic Scanning Micro-mirror and
Optical Scanning Device Using The Same,” U. S. patent 7324252
23. C.-H. Ji, “Electromagnetic Variable Focus Mirror,
Fabrication Method for the Same, and Operating Method for the Same,” Korea
patent 0657002, “Variably Focusing Mirror Driven by Electromagnetic Force
and Operating Method Thereof,” U. S. patent pending, 2006-399532
24. C.-H. Ji, and J.-U. Bu, “SAW Linear Motor, Package and
Lens Actuator Using Thereof,” Korea patent 0706317, “Surface Acoustic Wave
Linear Motor, Surface Acoustic Wave Linear Motor Package, and Lens Actuator
Adopting the Surface Acoustic Wave Linear Motor Package,” U. S. patent
pending, 2006-341222
25. J-H. Choi, S.-H. Kim, and C.-H. Ji, “Linear Actuator Using Voice Coil Motor Type
Actuation,” Korea patent 0693421
26. S.-H. Kim, J-H. Choi, and C.-H. Ji, “Piezo Actuated Linear Motor, Driving Method Thereof
and Camera Module Using the Same,” Korea patent 0693752
27. C.-H. Ji and Y. Yee, “Optical Switch,” Korea patent
0565598, Korea patent pending, 2002-065335, 2002-075488, U. S. patent
pending, 2003-688895
28. C.-H. Ji, and Y. Yee, “Variable Optical Attenuator,” Korea
patent 0587327, U. S. patent pending, 2004-892295
29. C.-H. Ji, Y. Yee, and J. Choi, “Apparatus for Controlling
Flux Using Flux-controlling Valve,” Korea patent 0512186, “Flow Control
Valve and Flow Control Valve Apparatus Using the Same,” U. S. patent
7014165
30. C.-H. Ji, Y. Yee, and J. Choi, “Flux-controlling Valve,”
Korea patent 0512185
31. C.-H. Ji, Y. Yee, and J. Choi, “Electromagnetically
Actuated Micro Valve,“ Korea patent 0510696, “Micro-actuator, Fabrication
Method Thereof, and Micro-actuating Valve,” U. S. patent 7055797
32. Y. Yee, C.-H.
Ji, J. Choi, and S.-H. Kim, “Valve for Fluidic Mass Flow Control and
Fabrication Method Thereof,” Korea patent 0504794
33. C.-H. Ji, and Y. Yee, “Variable Optical Attenuator and
Array of the Same,” Korea patent 0495533
34. C.-H. Ji, Y. Yee, T.-S. Lim, K.-C. Song, and J.-U. Bu,
“Optical Receiver and Transmitter with Integrated Variable Optical
Attenuator,” Korea patent 0492544
35. C.-H. Ji, Y. Yee, and J.-U. Bu, “Electro-magnetically
Actuated Optical Switch,” Korea patent 0447212
36. C.-H. Ji, Y.-K. Kim, and H. Choi, “Apparatus for Dividing
Optical Signal,” Korea patent 0708073
37. C.-H. Ji, Y.-K. Kim, and B.-K. Choi, “Movable Micro Mirror
for a Video Display Apparatus and Manufacturing Method Therefor,” Korea
patent 0270812
38. C.-H. Ji,
Y.-K. Kim, and B.-K. Choi, “Movable Micro Mirror for a Video Display
Apparatus,” Korea patent 0270813
10 U. S., 16 E. P. O., 7 Japan,
2 Taiwan, 6 China, 13 Korea patents pending.
6 U. S., 28 Korea patents issued as of October,
2008.
AWARDS
2006 Best Paper Award (Second Prize) – The
8th Korean MEMS Conference
2005 Prominent Researcher Award – LG
Electronics Institute of Technology
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