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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.
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.
$Br{\aa}nemark\;Novum^{(R)}$ 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.
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.
갈등의 극복과 자아의 발견; 스타인벡의 소설 "에덴의 동쪽"의 주인공 갈렙(Caleb)에 근거한 연구
김우영,Kim, Wooyoung The International Promotion Agency of Culture Tech 2024 The Journal of the Convergence on Culture Technolo Vol.10 No.3
우리는 이 논문에서 존 스타인벡(John Steinbeck)의 "에덴의 동쪽(East of Eden)"에서 중요한 역할을 하고 있는 주인공 캐릭터인 Caleb Trask (또는 Cal)의 삶을 통해 얻은 교훈을 연구한 결과를 제시한다. Caleb의 삶은 자아, 타인, 그리고 사회와의 갈등을 극복하며 자아 발견의 과정에서 하나의 좋은 예를 제공해 주고 있다. 그는 여정 동안 자신의 감정을 인정하고 표현하는 법을 배우며 감정을 관리하고 이해하는 중요성을 강조한다. 욕망과 갈등에 직면하는 경우에는 지신이 생각하는 도덕적인 판단을 내려 행동하고, 윤리적 결정에 기반한 자기 결정의 중요성을 투명하게 보여주면서 자신의 진솔한 감정 표현과 수용은 감정 관리와 이해의 핵심 가치를 강조한다. 더불어 그의 이야기는 인간 관계에서 이해와 타협의 명확한 중요성을 강조한다. 우리는 이러한 주제에 대한 철저한 탐구를 제시하며, Caleb의 이야기에서 얻은 교훈이 어떻게 우리의 일상생활에 적용될 수 있는지를 고려한다. 이 논문에서 분석한 결과, 우리는 이러한 교훈을 어떻게 실제로 적용하고 실천할 수 있는지에 대한 통찰력을 얻을 것으로 기대한다. In this paper, we present the results of a study of lessons learned from the life of Caleb (Cal), a significant character in John Steinbeck's "East of Eden." His life serves as a powerful example of the process of self-discovery, overcoming conflicts with self, others, and society. He emphasizes the importance of managing and understanding your emotions, learning to acknowledge and express them throughout your journey. He makes moral judgments while confronting desires and conflicts, and transparently demonstrates the importance of self-determination based on ethical decisions, while his honest expression and acceptance of his own emotions emphasizes the core value of emotion management and understanding. Additionally, his story emphasizes the clear importance of understanding and compromise in human relationships. We present a thorough exploration of these topics and consider how the lessons from Caleb's story can be applied to our everyday lives. As a result of the analysis in this paper, we expect to gain insight into how these lessons can be applied and put into practice.
김우영,A. Gladkov,V. Kavtanyuk,선용근,C. C. Yun,J. W. Kim 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3
Polarized rare isotope (RI) beams have been designed at the Rare Isotope Science Project (RISP)for the study of the nuclear-structure, nuclear-reaction and astrophysics experiments. A powerfulmethod has been adopted for this work − the production of polarized RI beams via projectilefragmentation. The in-flight system line was designed for this purpose at the RISP by using theprojectile fragmentation method. The working principle, schematic design and experiments to beperformed at the RISP will be presented.