초정밀 광소자 정렬 스테이지의 구동 특성에 관한 연구

정상화,차경래,김현욱,최석봉,김광호,박준호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

As the optical communication is introduced to the backbone network at first and becomes a general communication method of network, the demand of kernel parts of optical communication such as PLC(Planar Light Circuit), Coupler, and WDM(Wavelength Division Multiplexing) element increases. The alignment and the attachment technology are very important in the fabrication of optical elements. In this paper, the driving mechanism of ultra precision stage is studied with the aim of optimal design of stage. The travel and the resolution of stage are investigated. The hysteresis of the stage is generated because of PZT actuator. The hysteresis and the inverse hysteresis are modeled in X, Y, and Z-axis motion. The input data of desired displacement to the stage according to input voltage is obtained from the inverse hysteresis equation. In the result of experiments with the input data, the errors due to hysteresis are well compensated.

극초정밀 다축 스테이지의 광소자 정렬에 관한 연구

정상화,차경래,김현욱,최석봉,김광호,박준호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

In recent years, as the demands of VBNS and VDSL increase, the development of kernel parts of optical communication such as PLC(Planar Light Circuit), Coupler, and WDM elements increases. The alignment and the attachment technology are very important in the fabrication of optical elements. In this paper, the optical alignment characteristics of multi-axis ultra precision stage were studied. The alignment algorithms were studied for applying to the ultra precision multi-axis stage. The alignment algorithm is comprised of field search and peak search algorithms. The contour of optical power signals can be obtained by field search and the precise coordinate can be found out by peak search. Two kinds of alignments, such as 1ch. input vs. 1ch. output optical stack, and 1ch. input vs. 8ch. output PLC stacks were performed for investigating the alignment characteristics.

초경합금 소재 LCU_CL 코어의 초정밀 연삭 특성에 관한 연구

정상화,차경래,김현욱,이봉주 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

As the various manufacturing technology of optical glass is developed, the aspherical lenses are applied to many fields. However, It is still very difficult to manufacture glass lens because of the high cost and the short life of core. In recent years, the demands of the aspherical glass lenses increase since it is difficult to obtain the desirable performance in the plastic lens. In the glass mold lens, it has merits of high productivity and reproductivity since lens is manufactured by the only forming with high precision mold. The fabricating conditions for glass mold lens are glass surface that does not cause fusion, viscosity of 108-1013 poise for the 0.2㎛ accuracy, and viscoelasticity for the roughness less than 100 angstrom. In this thesis, ultra-precision grinding characteristics of tungsten carbide for forming the aspherical glass lens core were studied and the result of it is applied to manufacture the tungsten carbide-base core of the glass lens used to the laser scanning unit and the camera phone.

원형 플레이트 형태에 따른 초음파 부상 장치의 진동특성에 관한 연구

정상화,최석봉,차경래,김현욱,김광호,박준호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

In the semiconductor and optical industry the non-contact transportation is required for reducing the damages. The ultrasonic levitation is the solution of the problem. In this paper, the ultrasonic levitation system and 3 disk-type stator for levitation various object are proposed. The vibration modes of disks are analyzed with FEM and designed with the analysis results. The 3D vibration profiles of the disks are measured by Laser scanning vibrometer for verifying the vibration characteristics of the system. The amplitudes of the disks and the levitation heights of object are measured for evaluating the performance.

다채널 광정렬 장치에서의 다자유도 회전 스테이지 동작 특성에 관한 연구

정상화,차경래,김현욱,최석봉,김광호,박준호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 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 are studied. with the three different method and the results of them are applied to the design of the system. The performance test of resolution and travel is performed.

NITINOL을 이용한 차동식 액츄에이터의 설계에 관한 연구

정상화,김현욱,신현성,차경래,신병수 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 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.

NiTi-형상기억합금 차동식 액츄에이터의 동특성연구

정상화,김현욱,장우양,김경석,차경래,나윤철 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.2

최근 전 세계적으로 초소형 정밀 기계 기술에 관한 연구 및 개발이 활발하게 이루어지면서 형상기억합금(Shape Memory Alloy : SMA)을 이용한 초소형 액츄에이터(Micro Actuator)에 관한 관심이 증대되고 있다. 형상기억합금을 액츄에이터에 응용하기 위해서는 동적 특성의 분석이 필수적이지만 지금까지의 연구에서는 형상기억합금의 물질 및 재료적 특성은 많이 보고되고 있으나 동적 특성에 대한 연구는 매우 부족한 실정이다. 본 논문에서는 비저항(resistivity)이 큰 NiTi합금 와이어(wire)를 이용하여 나선형 스프링(helical spring)을 제작하여 디지털 힘 측정기(Digital force gauge)와 적외선 온도센서(Infrared themometer) 그리고 레이저 변위 센서(Laser displacement sensor)를 이용하여 이 NiTi 스프링의 힘의 크기와 반응속도, 온도와 변위를 측정하여 형상기억합금의 동적 특성을 분석하였다. 또한 형상기억합금을 이용하여 차동식 액츄에이터를 제작하여 그 동적 성능을 실험하였다. 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.

구간분할 바이너리 제어를 이용한 로봇핸드의 동특성에 관한 연구

정상화,차경래,김현욱,최석봉,김광호,박준호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

In recent years, as the robot technology is developed the researches on the artificial muscle actuator that enable robot to move dextrously like biological organ become active. The widely used materials for artificial muscle are the shape memory alloy and the electro active polymer. These actuators have the higher energy density than the electromechanical actuator such as motor. However, there are some drawbacks for actuator. SMA has the hysterical dynamic characteristics. In this paper the segmented binary control for reducing the hysteresis of SMA is proposed and the simulation of anthropomorphic robotic hand is performed using ADAMS.

미생물제 Mity-Gro의 포도 품질 향상 효과

정경화,상혜영,윤정희,박희승 中央大學校 食糧資源硏究所 2002 食糧資源硏究所 論文集 Vol.14 No.1

Mity-Gro는 비병원성 박테리아인 Bacillus Lateosporus를 주성분으로 하는 미생물제재로서 본 실험은 Mity-Gro가 포도 품질 향상에 미치는 효과를 알아보기 위하여 수행하였다. Mity-Gro 엽면시비는 포도과실의 착색을 증진시키는 것으로 나타났으며 유의성은 인정되지 않았으나 일부 당도향상 효과가 있는 것으로 조사되었다. 착색에 대한 처리효과는 품종간, 과방중간에 다른 것으로 조사되었다. 반면에 Mity-Gro 처리는 과실 비대에는 영향을 미치지 않으며 다른 외부요인들이 과실비대에 더 큰 영향을 미치는 것으로 나타나 Mity-Gro 처리에 의한 수량증대는 기대하기 어려웠다. 한편 멸균처리시에도 안토시아닌 증가를 통한 과실의 품질향상 효과가 인정되어 이와 관련된 다른 연구가 필요할 것으로 생각되었다. This experiment was conducted to study the effect of Mity-Gro on the improvement in the quality of Grapes. Mity-Gro is a microbial fertilizer that is made from Bacillus lateosporus, an avirulent bacteria. Applying Mity-Gro on the leaves of gapes improved in coloring of berries and had somewhat effect on increasing the sugar content. The effects of Mity-Gro on coloring between varieties and between clusters were different. In contrast, applying Mity-Gro on the leaves of grapes did not directly effect on the growth of berries, Because many unknown external factors were considered to affect on berry growth, the increase in grape quantity by applying of Mity-Gro could not be expected. However, more studies in related areas are necessary in the future since anthocyanin content of grapes was increased in the control, the treatment of sterilizing water.

혼합형 자가면역성용혈성빈혈과 동반된 Evans 증후군 1례

선길홍,윤찬영,박상곤,박경희,우정주,한경택,김진화,김영훈,정춘해,박치영 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.2

Evans syndrome is defined as a simultaneous or sequential occurrence of autoimmune hemolytic anemia and autoimmune thrombocytopenia. Autoimmune hemolytic anemia (AIHA) is usually induced by IgG warm autoantibody or cold-active IgM antibodies reacting specifically with antigens associated with a patient's RBC. AIHA is a fairly uncommon disorder, with estimates of the incidence at 1 to 3 cases per 100,000 per year. Mixed-type AIHA is a relatively uncommon form of AIHA, with studies noting the incidence of 7-8% among cases of AIHA. We experienced a patient, 46-year-old woman who was diagnosed having a very rare clinical presentation of mixed warm and cold antibody mediated Evans syndrome. She was treated with corticosteroid therapy only and has been maintaining a complete response for 15 weeks. 저자들은 혼합형의 자가면역성 용혈성 빈혈과 자가면역성 혈소판 감소증이 동시에 발생한 혼합형 Evans 증후군으로 진단하고 스테로이드 요법 후 혈액학적으로 회복된 상태로 15주가 지난 현재 steroid 5 mg/일 까지 감량한 상태에서 추적 관찰 치료중인 46세 여자 환자를 경험하였기에 문헌 고찰과 함께 보고하는 바이다.