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.

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

판형교 장대레일화에 따른 레일축력에 관한 연구

박준오(Park Joon-Oh),홍선호(Hong Sun-Ho),전한준(Jeun Han-Joon) 대한토목학회 2000 대한토목학회 학술발표회 논문집 Vol.2000 No.4

진행성 악성종양별 맞춤 항암요법의 최신 지견 ; 진행성 대장암의 맞춤 항암요법의 최신지견

박준오 ( Joon Oh Park ) 대한내과학회 2009 대한내과학회지 Vol.77 No.1

Approximately 18,000 cases of colorectal cancer (CRC), accounting for 12.3% of all cancer types, were diagnosed in Korea during 2005. Approximately 20% of these patients were found to have metastatic CRC (mCRC), which has a 5-year survival rate of 10%, at the initial diagnosis. Oxaliplatin- and irinotecan-based combination chemotherapy with infusional 5-FU and leucovorin are currently the standard first-line therapies for mCRC. Recent studies have suggested, however, that survival outcomes can be further improved by adding biologic agents such as cetuximab and bevacizumab to the chemotherapy regimen. Novel treatment strategies involving the increasing number of therapeutic agents are being investigated to improve the efficacy, safety, and tolerability of multi-agent therapy. These strategies have included switching the therapy before progression, maintenance therapy, and chemotherapy-free intervals. Studies have found that the effectiveness of targeted therapies can be linked to the presence or absence of specific genomic changes. Consequently, identifying patients who are amenable to targeted therapy will be essential in daily practice as well as in clinical trials. In the present work, we review recent innovations in chemotherapy for mCRC with a focus on emerging data that may significantly improve both the survival and quality of life for patients with CRC. (Korean J Med 77:18-25, 2009)

철도교 상시계측시스템용 검교정기 제작 및 시험

박준오(Park Joon-Oh),이준석(Lee Jun S.),최일윤(Choi Il-Yoon) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-

Calibration of the health monitoring system is considered in this study. For this, brief introduction on the realtime monitoring system, installed in some of the Korea Highspeed Railway bridges, is made and specifications of the calibrators are outlined. Calibration method is next explained for each sensor and detailed procedures are illustrated. Calibration results will be published elsewhere and modification of the gauge factors will also be investigated in detail.

현장계측을 통한 기존선 철도 구조물 접속부의 거동분석

박준오(Park Joon-Oh),이상배(Lee Sang-Bae),홍원표(Hong Won-Pyo) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-

Korean trains pass many mountain areas, so the volume of structures like bridge and tunnel has large part of railway lines. Train speed-up naturally needs a straight line in railway, then structures are increasing, and the length of structure has more than 70% in Kyongbu high-speed railway. The stiffness of bridge and tunnel is higher than the soil in the roadbed in spite of dynamic difference in vibration and displacement. Differences in stiffness have more dynamic effects and increase the deformation and destruction in the track and roadbed. This influences passenger"s comfort and the safety of operation, and it needs more track maintenance. This study selected tunnel with ballast track, tunnel with concrete track, and structure"s approaches with short maintenance cycle in the roadbed and had track acceleration tests and track liner inspections using track master in the field. This study will measure periodically to structure"s approaches which have very fast track irregularity and analyze dynamic differences and track irregularity near structure"s approaches, so realize the cause of track irregularity of structure"s approaches and use basic data for reasonably strengthening method of structure"s approaches.

기존선 철도구조물 접속부의 보강에 대한 고찰

박준오(Park Joon-Oh),이상배(Lee Sang-Bae),김관형(Kim Kwan-Hyung) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-

Korean trains pass many mountain areas, so the volume of structures like bridge and tunnel has large part of railway lines. Train speed-up naturally needs a straight line in railway, then structures are increasing, and this influences passenger"s comfort and the safety of operation, and it needs more track maintenance. The stiffness of bridge and tunnel is higher than the soil in the roadbed in spite of dynamic difference in vibration and displacement. Differences in stiffness have more dynamic effects and increase the deformation and destruction in the track and roadbed. This study will measure periodically to structure"s approaches which have very fast track irregularity and analyze dynamic differences and track irregularity near structure"s approaches, so realize the cause of track irregularity of structure"s approaches and use basic data for reasonably strengthening method of structure"s approaches.

광대역 파장가변 이중 링 공진기 Add/Drop 필터

이동현,이태형,박준오,김수현,정영철,Lee, Dong-Hyun,Lee, Tae-Hyung,Park, Joon-Oh,Kim, Su-Hyun,Chung, Young-Chul 한국광학회 2007 한국광학회지 Vol.18 No.3

본 논문에서는 굴절률 차이가 큰 폴리머 광 도파로를 이용하여 광대역 파장가변이 가능한 이중 링 공진기 Add/Drop 필터를 제작하였다. Add/Drop 필터의 제작시 공정 오차에 둔감한 특성을 갖도록 광 결합기를 설계하였다. 코어와 클래딩의 굴절률은 1550 nm 파장 대역에서 각각 1.51, 1.378로 약 $100{\mu}m$ 정도의 곡률 반경을 가지는 곡선 도파로를 수용할 수 있다. 두 개의 링이 동시에 공진하는 파장 대역에서 Drop 특성은 이웃하는 피크 좌다 약 2.9 dB 이상 높은 특성을 보였다. 이 필터는 반사형 반도체 광증폭기 등과의 하이브리드 집적을 통하여 광대역 파장 가변 레이저 다이오드를 구현하는데 활용할 수 있을 것으로 기대된다. A widely tunable add/drop filter composed of double ring resonators is implemented with high-index-contrast polymer waveguide. To enhance the productivity, directional couplers are designed to have good fabrication tolerance. The refractive indices of the core and cladding in the 1550 nm wavelength are 1.51 and 1.378, respectively. Drop response in comparison with neighborhood peak gets enhanced by more than 2.9 dB at the wavelength where both rings resonate. This filter can be used to build widely tunable laser diode through hybrid-integration with reflective SOA.

A Study on the Necessity of Maintenance of Railway Structures based on the Integration of LCC and LCA

진남희(Jin Nam-Hee),박준오(Park Joon-Oh),박미연(Park Mi-Yun) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

철도시설물의 유지관리를 위한 전통적인 의사결정 방법은 구조물의 기술적인 측면 즉, 시설물의 안전성과 사용성 등을 만족시키는 조건하에 경제적인 측면 즉, 시설물의 생애주기 비용을 최소화하고자 하는 것이며, 생애주기 비용을 정량화하기 위한 도구로서 LCC 기법이 사용되었다. 그러나, 1990년대 후반 이후로 지구온난화 등의 피해가 부각됨에 따라 선진국들을 중심으로 시설물의 유지관리를 위한 의사결정에 환경적 측면과 사회적 측면을 추가적으로 고려하는 지속가능한 발전 개념을 도입하고 있으며, 환경 부하를 정량화하기 위한 도구로서 LCA를 적용하고 있다. 본 연구에서는 시설물의 유지관리 행위와 관련된 경제적 측면과 환경적 측면을 정량화하는 방법으로서 LCC 및 LCA의 적용 방안을 고찰하고, LCC 및 LCA 결과로부터 시설물 유지관리 최적 방안을 결정하기 위한 의사결정 기법을 제안한다. 국내의 철도시설물에 대한 유지관리 필요성이 증대되고 있으며, 철도시설물의 규모가 커서 유지관리행위에 따른 경제적 및 환경적 파급효과가 큼을 감안할 때, 본 연구에서 제안된 내용은 경제적이고 환경 친화적인 철도시설물 유지관리 방안을 선정하는데 유용한 방법론으로 활용될 것으로 사료된다.

십이지장에 발생한 고분화 편평세포암종 1예

최원석 ( Won Seok Choi ),박준오 ( Joon Oh Park ),정해원 ( Hae Won Jeong ),장태훈 ( Tae Hoon Jang ),윤원경 ( Won Kyoung Yun ),이지인 ( Ji In Lee ),박영석 ( Young Suk Park ) 대한내과학회 2008 대한내과학회지 Vol.75 No.3

십이지장의 원발성 편평세포암종은 매우 드문 종양이며 치료와 예후도 아직 잘 알려져 있지 않다. 최근 저자들은 복통을 주소로 내원한 44세 여자 환자를 복부 전산화 단층 촬영, 내시경, 전신 PET-CT 촬영을 통해 십이지장에서 발생한 원발성 편평세포암종으로 진단하였다. 환자는 수술을 하지 못하는 진행성 병변소견으로 고식적 항암치료를 시행하였으나 결국 악화소견을 보였으며, 이에 십이지장에서 발생한 편평세포암종을 문헌고찰과 함께 보고하는 바이다. Squamous cell carcinoma of the duodenum is an extremely rare neoplasm worldwide. A 44-year-old female patient was admitted to our institution for abdominal pain, and she was diagnosed with primary squamous cell carcinoma of the duodenum. The duodenal cancer was inoperable due to vascular invasion and regional lymph node metastasis. The patient was treated with palliative chemotherapy, but her disease progressed, and she was eventually referred to a local hospital for supportive care. The prognosis of squamous cell carcinoma of the duodenum is poor compared with that of usual duodenal adenocarcinoma. We report the details of this case of squamous cell carcinoma of the duodenum along with a review of the literature. (Korean J Med 75:349-353, 2008)