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송칠영,이경형,이인세,이승우,박범진,김선아,이욱,전양 충남대학교 농업과학연구소 1996 농업과학연구 Vol.23 No.2
Herbal and woody plants were surveyed in native and aritifitial stands of experimental forest and stand within the vicinity of belongings facilities in Chungju Experimental Forest, Chungnam National University. Appearance species were classified and taken a photograph of. There were a total of 135 kinds, 60 familia, 113 genus, 123 species, 12 variatas. 49 kinds of them were herbs, 86 kinds were woody plants, and 7 kinds were evergreen trees. We try to solve the problem that species of plant could be sustained going on and be diversified.
레이저 진동 측정기를 이용한 초음파 이송 시스템의 동작특성에 관한 연구
정상화,신병수,이경형 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
In the semiconductor and the optical industry a new transport system which can replace the conventional sliding system is required. These systems are driven by magnetic field and conveyer belt. The magnetic field damages semiconductor and contact force scratches the optical lens. The ultrasonic wave driven system can solve these problem. In this paper, the vibration behavior of flexural beam in the ultrasonic transport system is verified using Laser Scanning Vibrometer. The experiments for verifying vibration are performed in three conditions such as in the maximum transport speed, in the zero speed, and in the change of transport direction.
다채널 광정렬 장치에서의 다자유도 회전 스테이지 동작 특성에 관한 연구
정상화,차경래,최석봉,김광호,박준호,이경형 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
In recent years, as the demands of VBNS(Very high speed Backbone Network Service) and VDSL(Very high-data rate Digital Subscriber Line) increase, the development of kernel parts of optical communication such as PLC(Planar Light Circuit), Coupler, WDM elements increase. The alignment and the attachment technology are very important to fabricate the optical elements for communication. In this paper, the mechanism of rotational stage, the contact sensing unit, and integrated control circuit for the optical alignment system are studied.
정상화,최석봉,차경래,김광호,박준호,이경형 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
In the semiconductor and the optical industry a new transport system which can replace the conventional sliding system is required. These systems are driven by magnetic field and conveyer belt. The magnetic field damages semiconductor and contact force scratches the optical lens. The ultrasonic wave driven system can solve these problem. In this paper, the relationship of transporting speed according to the change of flexural beam shape and the effect of transporting speed according to the change of weight and amplification voltage are verified. The vibration behavior of flexural beam in the ultrasonic transport system is experimented using Laser Scanning Vibrometer.
NiTi 형상기억합금을 이용한 차동식 액츄에이터의 동작성능 향상을 위한 연구
정상화,김현욱,차경래,송석,신병수,이경형 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
In the recent years, as the research and the development of micro and precision machinery become active, the interest of micro actuators using SMA(Shape Memory Alloy) has been increased. The dynamic characteristic analysis of SMA is necessary for actuator application and many common researches report the material characteristics of SMA sufficiently. However, the research on dynamic characteristics is very deficient. In this paper, the helical spring are fabricated with NiTi SMA wire of high resistivity. The force, response speed, temperature, and displacement are measured by digital force gauge, infrared thermometer, and laser displacement sensor so that the dynamic characteristics of this SMA is analyzed. Also, bidirectional actuator was fabricated and experimented for its performance.