Location History:
- Seungnam, KR (1999)
- Kyungki-do, KR (1999)
- Kyungi-do, KR (1999)
- Kyunggi-do, KR (2000 - 2002)
- Cheonan-si, KR (2012)
Company Filing History:
7 out of 132,083 
1 out of 15 
Years Active: 1999-2012
Title: Chang-Hyun Ryu: Innovator in Semiconductor Testing and Computer Systems
Introduction
Chang-Hyun Ryu is a notable inventor based in Cheonan-si, South Korea. He has made significant contributions to the fields of semiconductor testing and computer systems, holding a total of 7 patents. His innovative work has had a lasting impact on technology and engineering.
Latest Patents
One of his latest patents is an "Apparatus to perform a non-contact test of a semiconductor package." This apparatus includes a vertical illuminator that supplies vertical illumination in the same axial direction as the measurement target. It also features a vertical image unit that captures a vertical image of the measurement target, allowing for 2-dimensional determination of information regarding the shape, size, or position of a solder ball. Additionally, an inclined illuminator provides inclined illumination from a different axial direction, and an inclined image capture unit captures a side image of the measurement target. This design enhances the testing apparatus's ability to 3-dimensionally determine the state of contact of the solder ball with the ball land, significantly increasing test reliability and yield.
Another notable patent is the "Computer system with PC cards and method of booting the same." This invention describes a computer system that includes a bootable configuration by loading a boot record from a nonvolatile memory of the PC card. When the PC card is installed in a PCMCIA adapter, the system loads the boot record from the card to memory and performs system booting. This innovation allows multiple users to load their required system environments conveniently from the PC card, enhancing user experience and system security.
Career Highlights
Chang-Hyun Ryu has worked with prominent companies such as Samsung Electronics Co., Ltd. and Intekplus Co., Ltd. His experience in these organizations has contributed to his expertise and innovative capabilities in technology.
Collaborations
Some of his notable coworkers include Ssang-Gun Lim and Dong-Hae Son. Their collaboration has likely fostered a creative environment that encourages innovation and technological advancement.
Conclusion
Chang-Hyun Ryu's contributions to semiconductor testing and computer systems exemplify his innovative spirit and technical expertise. His patents reflect a commitment to enhancing technology and improving user experiences.