광반응 재료가 코팅된 단주기 광섬유격자 기반 자외선센서의 광민감도 향상 연구

김우영,김찬영,김현경,안태정,Kim, Woo Young,Kim, Chan-Young,Kim, Hyun-Kyoung,Ahn, Tae-Jung 한국광학회 2015 한국광학회지 Vol.26 No.2

This study was focused on developing an optical sensor that monitors ultraviolet (UV) light. Recently, we proposed and demonstrated a novel, highly sensitive UV sensor based on a fiber Bragg grating (FBG). To ensure that the incident UV light is focused on the FBG surface, the sensor was coated with an azobenzene polymer material that acts as a UV-induced stretchable functional material, in combination with a cylindrical focal lens. In this study we have improved the sensitivity of the sensor by employing a cylindrical focal mirror as a curved reflector, to refocus the UV light passing through the FBG. We considered the performance of several different types of reflectors and chose the optimal radius of curvature for the reflector. Compared to the UV sensor without an auxiliary device, the sensitivity of the FBG sensor with a focal lens and a curved reflector was 15 times as high. 본 논문은 자외선 광학센서 개발에 관한 것이다. 기존에 반도체 기반 자외선 센서를 대체하기 위해 개발된 단주기 광섬유격자기반 자외선 센서에 대한 측정 민감도를 향상시키기 위한 다양한 장치들을 설계하고 실험을 통해 성능을 확인하였다. 최근 연구를 통해 자외선 흡수에 따라 인장력이 유도되는 아조벤젠 폴리머 재료와 장력에 따른 광섬유격자 특성 변화를 조합하여 새로운 자외선 센서의 개념이 제시되었다. 본 연구에서는 광섬유격자 기반 자외선 센서에서 흡수하지 못하고 통과되는 자외선 잔광을 반사판을 이용해서 다시 반사시켜 센서에서 재흡수되는 원리로 센서의 민감도를 향상시켰다. 본 논문에서는 반사판의 종류를 선정하고 반사판의 곡률반경을 최적화하였다. 또한 기존의 원통형 집광렌즈를 이용한 민감도 향상 기술을 접목 시켜 아무런 장치가 없을 때와 비교해서 약 15배의 성능을 향상시키는 결과를 얻었다. 또한 외부 환경 효과를 줄이기 위한 패키지 모듈을 제작하여 적용하고 그 특성을 분석하였다.

$Br{\aa}nemark\;Novum^{(R)}$ 즉시 임플랜트 보철 수복 방법에 관한 삼차원 유한요소 분석적 연구

김우영,김영수,장경수,김창회,Kim Woo-Young,Kim Yung-Soo,Jang Kyung-Soo,Kim Chang-Whe 대한치과보철학회 2001 대한치과보철학회지 Vol.39 No.5

Since the treatment of edentulous patients with osseointegrated implant was first introduced more than 30 years ago, implant therapy has become one of the most important dental treatment modalities today. Based on the previous experience and knowledge, $Br{\aa}nemark\;Novum^{(R)}$ protocol was introduced with the concept of simplifying surgical and prosthetic technique and reducing healing time recently. This protocol recommends the installation of three 5mm wide diameter futures in anterior mandible and the prefabricated titanium bars for superstructure fabrication. This study was designed to analyze the stress distribution at fixture and superstructure area according to changes of fixture number, diameter and superstructure materials. Four 3-dimensional finite element models were fabricated. Model 1 - 5 standard fixtures (13mm long and 3.75mm in diameter) & superstructure consisted of type IV gold alloy and resin Model 2- 3 wide diameter fixtures (13mm long and 5.0mm in diameter) & superstructure consisted of type IV gold alloy and resin Model 3-3 wide diameter fixtures (13mm long and 5.0mm in diameter) & superstructure consisted of titanium and resin Model 4-3 wide diameter fixtures (13mm long and 5.0mm in diameter) & superstructure consisted of titanium and porcelain A 150N occlusal force was applied on the 1st molar of each model in 3 directions - vertical($90^{\circ}$), horizontal($0^{\circ}$) and oblique($120^{\circ}$). After analyzing the stresses and displacements, following results were obtained. 1. There were no significant difference in stress distribution among experimental models. 2. Model 2, 3, 4 showed less amount of compressive stress than that of model 1. However, tensile stress was similar. 3. Veneer material with a high modulus of elasticity demonstrated less stress accumulation in the superstructure. Within the limites of this study, $Br{\aa}nemark\;Novum^{(R)}$ protocol demonstrated comparable biomechanical properties to conventional protocol.

한의학적 치료법으로 호전된 요추 추간판 탈출증 환자의 영상의학적 변화

김우영,한상엽,김기역,공덕현,이현종,김창연,남항우,Kim, Wu-Young,Han, Sang-Yup,Kim, Ki-Yuk,Kong, Duck-Hyun,Lee, Hyun-Jong,Kim, Chang-Youn,Nam, Hang-Woo 척추신경추나의학회 2009 척추신경추나의학회지 Vol.4 No.1

Objectives: The aim of this study was to evaluate the evolution of lumbar disc herniation in patients treated with oriental medicine. Methods: 14patients(15 cases) with lumbar disc herniation proved at MRI(Magnetic resonance imaging) underwent a follow-up MRI study. Follow-up MRI was performed $4{\sim}14$months(mean 7 months) after initial MRI. Results & Conclusions: 1. 13 cases(87%) had reduction of disc herniation. 1 showed no change in amount of disc herniation. 1 had an increase in disc herniation. 2. Comparison initial MRI with follow-up MRI showed that 2 of the herniations decreased between 0% and 25%, 3 decreased between 25% and 50%, 5 decreased between 50% and 75%, 3 decreased between 75% and 100%. The size of the herniation decreased on average by 49% in 14patients(15 cases). 3. On axial images, the proportion of the cross-sectional area of the spinal canal occupied by the herniated disc was 54.41% on the average on the initial scan, 29.65% on the follow-up scan.

원가투입구조의 직접 조사에 의한 국내 건설공사비지수 개발을 위한 기초연구 - 도로시설물 중심으로 -

김우영,이준성,이영환,이복남,김윤주,Kim, Woo-Young,Yi, June-Seong,Lee, Young-Hwan,Lee, Bok-Nam,Kim, Yoon-Joo 한국건설관리학회 2006 건설관리 : 한국건설관리학회 학회지 Vol.7 No.2

한국의 건설공사비지수는 대한건설협회(이하 건협)가 1994년 이후 발표를 중단한 이후, 2004년 2월부터 정부에서 실적공사비제도와 관련하여 새롭게 공사비지수를 발표하기 시작하였다. 이 공사비지수는 한국은행(이하 한은)의 산업연관표, 생산자물가지수와 건협의 공사부문 시중노임 등 검증된 데이터를 활용하여 개발된 것이다. 기존의 통계자료만을 활용하는 것을 전제로 하였을 경우에는 이와 같은 방법이 유효할 수 있으나, 건설산업의 공사비 특성을 반영하기에는 일정한 한계가 있다. 본 논문에서는 이러한 한계를 극복하기 위하여 공사종류별로 노무비와 자재비의 투입구조를 직접적으로 조사하여, 해당 항목들의 원가변동치를 적용함으로써 건설공사비지수를 산출하는 방법을 도입하고자한다. 본 논문의 범위는 기존통계를 이용한 건설공사비지수의 문제점을 밝히고, 이를 대체할 수 있는 현실적인 대안으로서 직접조사에 의한 공사비지수 개발방법론의 타당성을 확인하는 것으로 한정한다. Korean Government started to publish Korean CCI(Construction Cost Index) again at February 2004 since CAK(Construction Association of Korea) stopped publishing it 1994. CCI is developed using the verified statistical data, that is, input-output table and producer price index by Korean Bank and labor unit cost by CAK. Though the method is available as it uses the verified statistical data, there is a limitation to reflect the characteristics of construction. For overcoming this limitation, this study suggests CCI development method investigating the input structure of labor and material cost for each type of construction project and applying the cost variations of the items.

건축교육헌장에 기초한 커뮤니티 디자인교육에 관한 연구

김우영,강태웅,소갑수,김승제,Kimm, Woo-Young,Kang, Tae-Woong,So, Kab-Soo,Kim, Seung-Je 한국교육시설학회 2012 敎育施設 Vol.19 No.2

Community design education has covered the worldview dimension of the collaborative courses for sustainability draws on the architectural expertise developed in a network of community projects and therefore case studies of design education by the collaborative project-based learning in terms of participants, students, teachers and architects, such as 'Learning By Design' for the K-12 comprehensive program in Massachusetts addresses how a local society can make its community sustainable by both design and education. To understand that community design and education can provide professional development in all levels of skills and knowledge across disciplines and opportunities for collaborative learning and problem-solving, this research consists of case studies of the community design education including social systems that assist in organizing the local educational program as well as promoting the programs with public awareness of the community. It covers the UNESCO-UIA agenda of the community design and education that is to enhance the physical environment relating to human interaction by developing innovative alternatives of existing community and contributing voluntarily to neighborhoods through design. As the community design collaborative of design professionals and users is a structural approach to assess design quality, the cases address how to set up the architectural program in order to share pro bono design service and provide high-quality design resources available for sustainable environment.

만성신부전증환자에서 부갑상선 절제술 시 수술 중 급속 부갑상선 호르몬 측정의 의의

김우영,손길수,배정원,구범환,이재복,Woo Young Kim,M,D,Gil Soo Son,M,D,Jeoung Won Bae,M,D,Bum Hwan Koo,M,D,and Jae Bok Lee,M,D 대한갑상선-내분비외과학회 2005 The Koreran journal of Endocrine Surgery Vol.5 No.2

Purpose: Intraoperative quick parathyroid hormone assay (PTH) was introduced in the parathyroid surgery since 1988 and the value in patients with primary hyperparathyroidism was well recognized in the literature. The purpose of this study was to evaluate the usefulness of intraoperative rapid PTH assay in patients with renal hyperparathyroidism by comparing intraoperative PTH results and the biochemical results at postoperative 6<SUP>th</SUP> month, including PTH values. Methods: Fifteen consecutive patients of renal hyperpara</SUP>thyroidism underwent total parathyroidectomy and immediate autotransplantation from November 2003 to February 2005. PTH levels were measured by PTH assay at the induction of anesthesia (baseline level) and in 20-minute intervals after excision of the last parathyroid gland. More than 50% drop of initial PTH level was considered as completeness of parathyroidectomy. Results: Twenty minutes after resection, PTH levels decreased by 83.7% in 14 patients and by 50.2% in one patient. Ten patients (67%) were cured but 5 patients (34%) showed high PTH levels after 6 months. The drop rate of intraoperative quick PTH level in cured patients was 92% at 26 minutes after parathyroidectomy and was significantly different from 73.3% of persistent or recurrent five patients (P=0.047). Preoperative PTH level, calcium level, alkaline phosphatase level and preoperative localization were not different in the cured and recurrent or persistent patients of renal hyperparathyroidism. Conclusion: The value of intraoperative quick PTH assayin patients of renal hyperparathyroidism was questionable. More than 92% drop of intraoperative PTH level at 26 minutes after parathyroidectomy could predict success in our study. (Korean J Endocrine Surg 2005;5:93-99)

전극 표면의 거칠기가 펜터신/전극 경계면의 전류-전압 특성에 주는 영향

김우영,전동렬,Kim, Woo-Young,Jeon, D. 한국진공학회 2011 Applied Science and Convergence Technology Vol.20 No.2

금속 전극 위에 유기물 채널을 증착하여 만드는 바닥 전극 구조의 유기물 박막 트랜지스터에서 전극 표면이 거친 정도에 따라 전하 주입이 어떻게 달라지는지 조사했다. 금 전극을 실리콘 기판에 증착하고, 가열하여 금 전극 표면을 거칠게 만들었다. 그리고 펜터신과 상부 전극으로 사용할 금 전극을 차례대로 증착하여 금 전극/펜터신/금 전극 구조를 만들었다. 펜터신 증착 초기에는 거친 금 전극 위에서 펜터신 증착핵이 더 많이 보였지만, 막이 두꺼워지면 가열되지 않은 전극과 가열로 거칠어진 전극에서 펜터신 표면 모양에 차이가 거의 없었다. 온도를 바꾸면서 측정한 전류-전압 곡선은 바닥 전극의 표면이 거칠수록 바닥계면의 전위장벽이 높음을 보여주었다. 이 현상은 금속 표면이 거칠수록 일함수가 낮아지며 펜터신과 거친 전극 표면의 경계에 전하 트랩이 더 많기 때문으로 생각된다. We investigated how the surface roughness of electrode affects the charge injection at the pentacene/Au interface. After depositing Au film on the Si substrate by sputtering, we annealed the sample to control the Au surface roughness. Pentacene and Au top electrode were subsequently deposited to complete the sample. The nucleation density of pentacene was slightly higher on the rougher Au electrode, but surface morphologies of thick pentacene films were similar on both the as-prepared and the roughened Au electrodes. The current-voltage curves obtained from the Au/pentacene/Au structure measured as a function of temperature indicated that the interface barrier was higher for the rougher Au bottom-electrode. We propose that the higher barrier was caused by the lower work function of rougher electrode surface and the higher trap density at the interface.

CO₂ 트윈 로타리 압축기의 흡입관로에서의 가스맥동 해석

김우영,안종민,김현진,조성욱,Kim, Woo-Young,Ahn, Jong-Min,Kim, Hyun-Jin,Cho, Sung-Oug 대한설비공학회 2011 설비공학 논문집 Vol.23 No.8

For a $CO_2$ one-stage twin rotary compressor, a T-shaped suction port was used to effectively supply the suction gas stream into two individual suction chambers of the twin cylinders. Suction gas pulsations were observed in the pressure sensor signals and these were simulated by using the acoustic modeling of Helmholz resonators in parallel. The module of acoustic modeling was combined to a computer simulation program for the compressor performance. Validation of the simulation program has been carried out for a bench model compressor in a compressor calorimeter. Cooling capacity and the compressor input power were reasonably well compared between the simulation and the calorimeter test. Particularly, good agreement on P-V diagram between the simulation and the test was obtained.

세라믹 메탈할라이드 램프의 아크튜브 열화현상 분석

김우영,이세일,양종경,장혁진,박대희,Kim, Woo-Young,Lee, Se-Il,Yang, Jong-Kyung,Jang, Hyeok-Jin,Park, Dae-Hee 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.12

Recently, the demand of ceramic metal halide lamp has been expanded. Therefore, the lamp with high efficiency and long lifetime are increasing and the evaluation of reliability is needed. In this paper, the degradation phenomena of ceramic metal halide lamp was studied. The lamp was tested for 3000 on/off cycles with each cycle having a duration of 20 minutes on and 20 minutes off based on the accelerated aging experiment based on "Reliability Standards RS C 0085". As result, the corrosion of arc tube and leak was appeared from reaction between inner wall of PCA and chemical elements, and distortion of electrode was resulted from difference of thermal expansion between arc tube of PCA and electrode. Also, the efficiency of lamp was decreased by the change of inner pressure, operation temperature, and driving voltage from wall blackening.

염산테트라싸이클린의 적용시간에 따른 임플란트 표면변화에 관한 주사전자현미경적 연구

김우영,이만섭,박준봉,허익,Kim, Woo-Young,Lee, Man-Sup,Park, Joon-Bong,Herr, Yeek 대한치주과학회 2002 Journal of Periodontal & Implant Science Vol.32 No.3

The present study was performed to evaluate the effect of tetracycline - HCl on the change of implant surface microstructure according to application time. Implants with pure titanium machined surface, SLA surface and $TiO_2blasted$ surface were used. Implant surface was rubbed with 5Omg/ml tetracycline - HCl solution for ${\frac}{1}{2}$ min., 1 min., $1{\frac}{1}{2}$ min., 2 min., and 3min. respectively in the test group and with no conditioning in the control group. Then, the specimens were processed for scanning electron microscopic observation. The following results were obtained. 1. In the pure titanium machined surfaces, the control specimen showed a more or less rough machined surface composed of alternating positive and negative lines corresponding to grooves and ridges. After treatment, machining line was more pronounced for the control specimens. but in general, test specimens were similar to control. 2. In the SLA surfaces, the control specimen showed that the macro roughness was achieved by large-grit sandblasting. subsequently, the acid-etching process crated the micro roughness, which thus was superimposed on the macro roughness. 3. In the SLA surfaces, irrespective of the application time of 50mg/ml tetracycline-HCl solution, in general, test specimens were similar to control. 4. In the $TiO_2blasted$ surfaces the control specimen showed the rough surface with small pits. The irregularity of the $TiO_2blasted$ surfaces with 50mg/ml tetracycline-HCl solution was lessened and the flattened areas were wider relative to the application time of tetracycline - HCl solution. In conclusion, pure titanium machined surfaces and SLA surfaces weren't changed irrespective of the application time of tetracycline-HCl solution. And the $TiO_2blasted$ surfaces conditioned with tetracycline - HCl solution began to be changed from $1{\frac}{1}{2}$ min. This results are expected to be applied to the regenerative procedures for peri-implantitis treatment.