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김동수,최혁원,신준우,문상웅,김재석,이주화.Dong Su Kim. M.D.. Hyuk Won Choi. M.D.. Joon Woo Shin. M.D.. Sang Woong Moon. M.D.. Jae Suk Kim. M.D.. Joo Wha Lee. M.D. 대한안과학회 2007 대한안과학회지 Vol.48 No.3
Purpose: There has not been any reports of Ralstonia paucula causing any ophthalmologic disease. However, we have detected Ralstonia paucula in the lens washing agents of a corneal ulcer patient wearing contact lens. Methods: A 26-years-old female patient was admitted to our hospital complaining of loss of visual acuity and hyperemia. Slit lamp biomicroscopy and smear culture was done to the anterior segment of the eye and the lens cleansing agent. The patient was treated with antibiotic eye drop and intravenous antibiotic medication. Results: The results of both smear and culture showed the presence of Ralstonia pacula and responded well to antibiotics treatment with ceftazidime.
조직플라스미노겐활성제를 이용한 유리체절제술시 제거된 내경계막의 구조
김동수,문상웅,유승영,곽형우,Dong Su Kim,Sang Woong Moon,Seung Young Yu,Ph,D,Hyung Woo Kwak,Ph,D 대한안과학회 2008 대한안과학회지 Vol.49 No.6
Purpose: This study evaluated the effect of tissue plasminogen activator (TPA) on adhesion between the internal limiting membrane and the vitreous cortex in patients with diabetic macular edema. Methods: This retrospective study included 14 eyes of 14 patients with diabetic macular edema without posterior vitreous detachment. The fourteen eyes were divided into two groups. In the first group, vitrectomy and internal limiting membrane (ILM) removal were performed after intravitreal TPA 0.1 cc (50 ug) injection the day before vitrectomy and in the second group, vitrectomy and ILM removal were performed without previous injection of TPA. We observed the ILM using electron microscopy and verified the effects of the TPA. Results: Spontaneous posterior vitreous detachment occurred in 3 of 7 eyes in the first group. Internal limiting membranes removed by vitrectomy showed a smooth surface in 4 of 7 eyes in the first group and in 1 of 7 eyes in the second group. Seven eyes of the first group and 6 eyes of the second group revealed decreased foveal thickness and increased visual acuity 90 days postoperatively. Conclusions: Preoperative intravitreal TPA injection was helpful for achieving posterior vitreous detachment and for decreasing possible postoperative complications involving in remnant vitreous cortex in patients with diabetic macular edema. J Korean Ophthalmol Soc 49(6):917-924, 2008
이택민(T.M.Lee),김동수(D.S.Kim),조정대(J.D.Jo),양정순(J.S.Yang),강태구(T.G.Kang),김광영(K.Y.Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In this paper, we present a design, fabrication and performance test of the novel DoD metal-jet injector for application to the high-density and high-temperature-melting materials. We design the gap adjustable DoD injector for controlling the size, speed and direction of the ejected metal droplets. The effect of design parameters on droplet size was analyzed. Fabricated gap adjustable injector ejects the D.I. water microdroplets whose measured volume is 7.23nl with the 4.8m/sec velocity through the 50㎛-diameter nozzle. Also the injector print the metal microdots, whose diameter is about 600㎛, on the glass at the chamber temperature of 200℃. Consequently, present novel metal-jet injector has a potential to applications for the fabrication of the low-cost fabrication of the electronic devices.
김동수(D.-S. Kim),이동원(D.-W. Lee) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
협심증, 심근 경색증 등의 관상동맥 질환을 치료하기 위하여 상용화된 스텐트 삽입술은 혈관이나 위장관, 담도 등에 침착된 혈전으로 발생한 체내 순환기의 막힘 현상으로 혈액의 흐름에 장애가 발생하였을 때, 외과적 수술을 통하지 않고 병변이 발생한 부위에 삽입하여 혈류를 정상화하는데 사용한다. 하지만 스텐트는 금속 또는 폴리머 튜브를 레이저로 가공하기 때문에 제작이 어렵고 안정적인 팽창을 위한 스트럿(Strut)의 선폭 및 두께에 따라 스텐트를 각각 제작해야 하는 한계가 존재한다. 본 연구에서는 포토리소그래피 기술을 사용하여 폴리머 및 금속 박막으로 구성되는 2D 평판에 기계적 특성을 갖는 구조를 패턴하고, 인덕터-커패시터(L-C) 공진 특성을 이용한 무선 압력센서가 집적화된 자기조립 스마트 스텐트를 제안하였다. 복잡한 형상의 스텐트의 제작은 MEMS 기반 마이크로머시닝 기술을 통하여 희생층 상부에 형성되며, 힌지와 세그먼트로 구성된 서로 다른 기하학적 구조의 상호연결을 통하여 실린더 구조로 자기조립 된다. 스트럿 상부에 형성된 인덕터는 Align Bonding 을 통하여 캐패시터와 접착 후 L-C 공진 특성을 이용한 무선 압력센서가 형성된다. 확장된 혈관의 직경을 유지하기 위하여 요구되는 압축력과 팽창력은 수정된 인장시험기를 통하여 측정되었으며, Radial Force 는 최대 ≥ 0.21 N/mm 로 우수한 기계적 특성을 갖는다. 또한 집적화된 무선 압력 센서의 인식거리 및 압력에 따른 공진 주파수 편이 측정을 통하여 선형 주파수 편이(R² > 0.96)와 약 40 kHz/mmHg의 감도를 확인하였다. 체외 테스트를 통해 첨단 의료용 스마트 스텐트 플랫폼의 가능성을 확인하였으며, 스마트폰 또는 원격장치와 연계하여 차세대 U-health 플랫폼으로 활용을 기대한다.
Micro On-Off Valve 해석에 의한 최적 설계
김동수(D. S. KIM),박상운(S. W. Park),고창섭(C. S. Koh) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Micro On-Off valves are currently recognized as the core technology in the fields of the micro fluid chip for medical applications and production lines of semi-conduct chip. Micro valves that operate by compressed air need the high-speed responsibility, repeatability, the absorbability and the uniform pressure by the poppet. In this study, Micro On-Off valves that posses the high-speed responsibility and the high rate of flow have designed and analyzed through the law of equivalent magnetic circuit and Finite Element Method (FEM) respectively. In case of poppet, Flow field characteristic was analyzed by the variation of poppet and it was able to display flow field by changing the location of the poppet. Also, we verified possibility of the design through the static and dynamic pressure and the 3D distribution curve of the force by working the front poppet.
김동수 ( D. S. Kim ),김윤조 ( Y. J. Kim ),강도수 ( D. S. Kang ),배봉열 ( B. R. Bea ),김병조 ( B. J. Kim ),강우형 ( W. H. Kang ) 대한내과학회 1971 대한내과학회지 Vol.14 No.4
A clinical study was performed in 200 cases of essential hypertension who were admitted to the Department of Internal-Medicine of 17th Army Hospital, from February 1966 to July 1970. The following results were obtained; 1) The age distributions were betwee
김동수(D. S. Kim),박재범(J. B. Park),이원희(W. H. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In the pneumatic system, pneumatic cylinder is wildly used to reciprocation and rotating movement. The uneasiness element of system is collision of piston, end-cap, head cap and tube when piston is<br/> loading. This has a short life of cylinder and is due to system destruction. We are applied to adhering with the cushion sleeve at the piston.<br/> At this pneumatic cushion cylinder, it is important to researching for cushion chamber characteristics of cushioning pressure and force. This study examines the dynamic characteristics of pneumatic cushioning cylinder and cushion sleeve desi후. At head part cushion chamber for the vertical experimental, The decisions of cushioning effect and the results of the experimental research are obtained to the followings:<br/> i ) The cushioning effects could acquire to the research, if the compressible energy is more than kinetic ones.<br/> ii) The collision of piston and head cover could acquire to the research, if the kinetic energy is more than compressible ones.<br/> iii) If the load increase to the rolling car, the cushion region pressures would increase and the dynamic force.