폴리머 결합 링 반사기를 이용한 하이브리드 집적 파장 가변 레이저

박준오,이태형,정영철,Park, Joon-Oh,Lee, Tae-Hyung,Chung, Young-Chul 한국광학회 2008 한국광학회지 Vol.19 No.3

광대역 파장 가변 레이저를 구현하기 위하여, 폴리머 결합 링 반사기를 반사형 반도체 광증폭기와 하이브리드 집적하여 광대역 파장 가변 레이저를 구현하였다. 도파로 폭과 높이의 제작 오차로 인하여 방향성 결합기의 결합 비 조합이 설계 값에서 다소 벗어나더라도 단일 피크 조건이 유지되도록 설계함으로써, 제작 수율을 높이도록 하였다. 구현한 파장 가변 레이저는 파장 가변 범위가 35 nm, 부모드 억제 비가 30 dB 이상 보임을 확인하였다. To realize a widely tunable laser diode, a polymer coupled-ring reflector is hybrid- integrated with reflective semiconductor optical amplifier. Even though ring-ring and ring-bus coupling ratios are changed by fabrication errors in waveguide width and height, they remain very close to the single peak condition, ensuring high yield in fabrication. The tuning range is observed to be about 35 nm, maintaining the side mode suppression ratio of about 30 dB.

소아에서 뇌수두증의 단락술 이후 발생한 석회화된 만성 경막하 혈종 - 증례보고 -

박준오,권택현,박윤관,정흥섭,이훈갑,서중근,Park, Juno,Kwon, Taek-Hyun,Park, Youn-Kwan,Chung, Hung-Seob,Lee, Hoon-Kap,Suh, Jung-Keun 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.7

Post-shunting subdural hemorrhages are usually small and self-limited, and they can be recognized on the routine post-operative CT examinations. However, delayed subdural bleeding may occur without any clinical symptoms or signs. Thus the hematoma remains undetected, and it can be increased in size and sometimes become calcified with time. We experienced a case of 15-year-old male with a large calcified subdural hematoma who had undergone shunt operation 10 years previously. With pertinent review of the literatures, we discuss the possible mechanism of calcification and the proper way of treatment in calcified chronic subdural hematoma.

Wide Angle BPM 을 이용한 광도파로열 격자 파장 필터의 해석

박준오,정영철,Park, Jun-O,Jeong, Yeong-Cheol 대한전자공학회 2002 電子工學會論文誌-SD (Semiconductor and devices) Vol.39 No.2

광도파로열 격자(AWG :Arrayed Waveguide Grating) 파장 필터는 전광 네트웍(All Optical Network)을 실현하는 매우 중요한 핵심 소자 중에 하나이다. 광도파로열 격자 파장 필터와 같은 광도파 소자를 해석 및 설계시 수학적인 해석이 필요하며, 가장 대표적인 방법은 BPM(Beam Propagation Method)이다. 본 논문에서는 Paraxial BPM과 Wide Angle BPM을 InP/InGaAsP/InP 광도파로열 격자 파장 필터 해석에 적용시켜 정화도의 차이를 고찰해 보았다. WA-BPM을 구현하기 위하여 저차의 Pade Approximant를 적용하였다. 광도파로열 격자 파장 필터의 SLL(Side Lobe Level)과 삽입손실(Insertion Loss)을 비교하여 분석하였다. 광도파로열 격자 파장 필터를 정확하게 해석 및 설계하기 위해서는 고차의 WA-BPM을 사용해야 함을 확인하였다. The key component to accomplish the WDM all optical network is an Arrayed Waveguide Grating(AWG) wavelength filter Numerical analysis is necessary for design and analysis of optical components like AWG wavelength filter. Beam Propagation Method(BPM) is the most widely-used method. In this paper, we analyze the difference between the paraxial BPM and the WA-BPM when they are applied to the analysis of InP/InGaAsP/InP AWG wavelength filter. The paraxial BPM is based on paraxial approximation, and the WA-BPM is based on the low order Pade approximant. The side lobe level(SLL) and insertion loss calculated from both methods are compared. The high order Pade approximant will to used to more accurate design and analysis of AWG.

전 교통 동맥 동맥류 치료의 예후인자

박준오,권택현,박윤관,정흥섭,이훈갑,서중근,Park, Juno,Kwon, Taek-Hyun,Park, Youn-Kwan,Chung, Hung-Seob,Lee, Hoon-Kap,Suh, Jung-Keun 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.5

Objective : The anterior communicating artery(ACoA) is known to be the most frequent location of intracranial aneurysms, but the complex arterial anatomy of the ACoA region makes this aneurysm among the most difficult one to treat. In the treatment of ACoA aneurysms, the direction of aneurysmal fundus is known to be very important in the surgical tactics. All ACoA aneurysms in our series were classified according to its direction, and analyzed the clinical features in order to investigate the prognostic factors influencing upon the surgical outcome. Methods : The authors reviewed 236 cases of ruptured ACoA aneurysms that were operated from 1990 to 1997, were classified according to Pia's classification. Results : The incidence rate of the ACoA aneurysm was 35.1%(236/672). Ventral group was more common than dorsal group, especially in ventro-caudal projection subgroup(36.0%). Poor preoperative clinical grade(Hunt-Hess grade IV and V) patients were more common in dorsal group(13.1%) than ventral group(2.6%). Rebleeding and intracerebral hematoma were more commonly seen in ventral group. However, vasospasm, hydrocephalus, hyponatremia, and intraventricular hemorrhage were observed more frequently in dorsal group. Worse outcome was more common in dorsal group than ventral group, especially in dorso-caudal projection subgroup. Also, poor outcome was identified in patients with intracerebral hematoma, intraventricular hemorrhage, hyponatremia, and hypertension, although statistically insignificant. In cases with the A1 dominancy, there was no difference in surgical outcome between the right and left side approach. The higher the aneurysmal neck from the planum sphenoidale, the worse outcome via pterional approach. Conclusion : It seems that the preoperative clinical grade, aneurysmal direction, and the height of aneurysmal neck, especially in the pterional approach, would be the major prognostic factors, and that intracerebral hematoma, intraventricular hemorrhage, hyponatremia, hydrocephalus and the intraoperative aneurysmal rupture would be the minor prognostic factors.

뇌간에 발생한 단발성 뇌낭미충증 - 증례보고 -

박준오,정용구,임동준,조태형,이훈갑,이기찬,서중근,Park, Juno,Chung, Young-Gu,Lim, Dong-Jun,Cho, Tae-Hyong,Lee, Hoon-Kap,Lee, Ki-Chan,Suh, Jung-Keun 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.10

Isolated brainstem invlovement of neurocysticercosis is rare. We present the clinical and radiological features of a patient with a solitary cysticercus granuloma in the brainstem confirmed by MRI and CSF ELISA test. Good response was obtained from conservative treatment, using praziquantel. We believe that patients from regions where cysticercosis is endemic, who have no systemic disease, who present with nonprogressive symptoms and signs of brainstem involvement, and display a solitary ring-enhancing mass in the brainstem measuring less than 20mm on neuroimaging may be managed conservatively.

아르누보 장신구 연구

박준오 ( Park Joono ) 경기대학교 산업디자인연구소 2002 조형논총 Vol.1 No.-

The characteristics of Art Nouveau tried to create a new art style by escaping from the past historic style. In this movement, the architecture and industrial arts have played as a central force and then Art Nouveau became a predominant style in the wide field of decorative arts including industrial art work, architecture and computer graphics now. While the typical style of the conventional architecture and industrial arts was inspired by Greece, Rome or Gothic, but Art Nouveau denied all the historic style and searched for a new expressive way by the motif of natural shapes. And they were interested in the property of each material and use various materials freely. Art Nouveau charmed people who lived under the prevailed negative climate of the city life at that period by suggesting a beautiful fantastical world, creating a particular rich style, completing craftsmanship, incorporating various materials and detail description that is inspired by organic forms like plants. The typical jeweller in the Art Nouveau is Lalique at Paris, and Josef Hoffman at Austria who designed more simple decorative pattern and showed a typical Secession jewelry. The true quality of Art Nouveau which influenced all the Europe is the futuristic mind of jewellers who pursuit new art style and motive escaping from previous tradition and history. From this point, Art Nouveau can be said as a starting point of modern decorative design.

철도교 상시계측시스템의 교정 및 교정상수 설정에 관한 연구

박준오(Joon-Oh Park),이준석(Jun S. Lee),최일윤(ll-Yoon Choi),민경주(Kyung-Ju Min) 한국철도학회 2002 철도저널 Vol.5 No.3

A health monitoring system becomes a useful tool to obtain information on long term behavior of the important railway structures such as very long span and special type bridges. The health monitoring system not only gives the direct measurement data of the railway bridges but also provides the basic data on the maintenance of the structures. Therefore, periodic calibrations of the health monitoring system will be a necessary step toward precise and accurate assessment of the railway bridges. In this study, the calibration and gauge factor readjustment process made for the health monitoring system installed in the railroad bridges is reviewed and some findings are explained in detail: specifically, the calibrators made for this purpose are illustrated and the regression processes of the calibration on long-term displacement using water level sensor, longitudinal displacement using LVDT sensor, instantaneous displacement using LVDT sensors and accelerometer are described in full length. Based on the regression results, it was found that the gauge factors need to be readjusted according to the regression equation but, since the deviation or shift is not serious so far, long-term observation on each sensor is also recommended. Future work will be concentrated on the long-term analysis of each sensor and on the database creation so that the assessment of the structures is possible

실습교과 Flipped Learning 사례연구 -‘재료와표현’교과목을 중심으로-

박준오 ( Park Joo No ) 경기대학교 산업디자인연구소 2017 조형논총 Vol.14 No.-

20세기 후반 컴퓨터의 보급과 인터넷 네트워크가 일반화된 후 온라인 러닝이 확산되고 있다. 역진행 수업, 또는 역전(逆轉)학습, 거꾸로 학습, 거꾸로 교실 등으로 불리는 Flipped Learning은 온라인과 오프라인 수업을 혼합한 Blended Learning(혼합형 학습)의 한 형태로 웹을 활용하여 학습능률을 올릴 수 있도록 하는 목적의 수업방식을 말한다. 저자는 디자인과 학생들의 전공기초 교육을 위한 입체조형 교과인‘재료와표현’을 Flipped Learning 방식으로 수업하였으며 그 사례를 통해 실습교과 Flipped Learning 적용에 대해 연구하였다. 이 교와의 편성목적은 1. 디자인관련학과 학생들의 전공 기초 공통과목으로 조형능력 향상과 재료의 특성에 따른 조형적용을 이해하게 한다. 2. 이러한 조형에 대한 이해와 조형 창출 실습과 병행하여 조형의 모티프가 되는 다양한 것들-자연, 인간, 문화 등-에 대한 폭넓은 이해와 깊이 있는 사유를 통해 조형 모티프를 다양하고 폭넓게 활용하게 한다. 3. 조형 주제를 명확히 하여 조형에 객관적인 설득력을 부여하도록 한다. 이를 위해 모티프나 콘셉트, 주제에 대한 정확한 개념을 이해시키고자 하였다. 이 수업은 경기대학교 디자인비즈 학부 소속 1학년 학생 70명이 3반으로 나뉘어 참여하였다. 연구자가 이를 통해 실현하고자 한 것은 오프라인 수업에서의 충분한 실기시간 확보, 실습내용에 대한 충분한 이해, 이론 수업에 대한 충분한 이해와 사고력 증진, 학습자의 능동적 학습 태도 고취, 협동수업을 통한 커뮤니케이션 능력 향상, 창의력 증진, 교수자가 Teaching에서 Coaching자로 변신해 수업을 보다 포괄적이고 객관적으로 관장함. 등이었으며 그 결과는 연구자가 진행하였던 과저의 수업에 비해 학습자들의 문제 해결능력의 증진이 두드러지게 향상되었다. 아울러 이를 통해 연구자는 수업에 참여한 학습자들의 내재된 능력을 새롭게 인식하게 되었다. 처음 시도한 Flipped Learning이었기에 부족한 점이 많았으며 이 수업을 바탕으로 다음 학기에 보다 정교한 구성과 충실한 준비로 성공적인 학습자 주도 학습 모델을 제시하고자 한다.

열영상카메라를 이용한 동적환경에서의 화점 및 사람 탐지

박준오(J.O. Park),김승훈(S.H. Kim) 한국정밀공학회 2018 한국정밀공학회 학술발표대회 논문집 Vol.2018 No.5월

열화상 카메라를 이용한 동적환경에서의 화점 탐지

박준오(J. O. Park),김승훈(S. H. Kim) 한국정밀공학회 2017 한국정밀공학회 학술발표대회 논문집 Vol.2017 No.5월