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박경찬 ( Park Gyeong Chan ),권중구 ( Kwon Jung Gu ),유길종 ( Yu Gil Jong ),배종석 ( Bae Jong Seog ),신재욱 ( Sin Jae Ug ),원태경 ( Won Tae Gyeong ),조규현 ( Jo Gyu Hyeon ),허성욱 ( Heo Seong Ug ),김은영 ( Kim Eun Yeong ),이창형 ( 대한소화기학회 2003 대한소화기학회지 Vol.42 No.6
There are diverse ring-like narrowings in the lower esophagus: mucosal ring, muscular ring, ring-like annular peptic stricture. Esophageal muscular ring is extremely rare and generally asymptomatic. It occurs at the proximal border of the esophageal vestibule that corresponds to the upper end of the lower esophageal sphincter. We experienced a case of lower esophageal muscular ring with a symptom of intermittent mild dysphagia for 40 years and report the findings with a review of the literature.(Korean J Gastroenterol 2003;42:539-543)
양자 교환된 리튬나오베이트를 이용한 광 픽업용 λ/2 파장판 제작
손경락,김광택,김영조,송재원,박경찬,김진용,Son, Gyeong-Rak,Kim, Gwang-Taek,Kim, Yeong-Jo,Song, Jae-Won,Park, Gyeong-Chan,Kim, Jin-Yong 대한전자공학회 2000 電子工學會論文誌-SD (Semiconductor and devices) Vol.37 No.4
본 논문에서는 리튬나오베이트 기판 상에 벤젠산으로 양자 교환 후 습식 식각하는 방법을 이용하여 청색레이저 다이오드를 광원으로 사용하고자 하는 광 픽업을 위한 λ/2 파장판을 제작하였으며 소자의 기능과 제작과정에 대해서 상세히 서술하였다. 그리고, 소자제작을 위한 최적의 조건을 실험을 통하여 확립하였다. 제작된 소자의 위상 특성은 광학계로 마하젠더 간섭계를 구성하여 파장이 632.8nm인 헬륨-네온 레이저로 측정하였다. 측정 결과 위상오차는 +5°∼6°(3% 이내)로 측정되었다. 본 연구에서 제작한 파장판은 청색 레이저 다이오드를 광원으로 사용하는 광 픽업 시스템의 해상도와 안정도를 향상시키는 유용한 소자로 응용될수 있다. In this paper, we have been fabricated λ/2 phase plates lot an optical pick-up using a blue violet laser diode by employing proton exchange and wet etching in LiNbO$_{3}$. Their functions and fabrication processes are described in detail. It is established the optimal fabrication conditions through the experimental results. The device characteristics are measured by the Mach-zender interferometer which is composed of the optical components and 632.8nm He-Ne laser. The measured phase error was +5$^{\circ}$~ -6$^{\circ}$(within 3%). This phase plate could be applied an useful device to improve the resolution and the stability of the optical pick-up which has a blue violet laser diode as an optical source.
조기 위암과 동반된 위선암과 유암종이 같이 있는 중복종양
김은영 ( Kim Eun Yeong ),박경찬 ( Park Gyeong Chan ),권중구 ( Kwon Jung Gu ) 대한소화기학회 2003 대한소화기학회지 Vol.42 No.6
Carcinoid tumors show variety of pathological features and some of them are admixed with adenocarcinoma. The carcinoma-carcinoid spectrum is a concept of classifying tumors based on the tumor mass differentiation which is composed of tissues of both endocrine and nonendocrine functions. When two types of tissues exist within one tumor intermingled with each other in a similar proportion, it is called composite tumor. On the other hand, collision tumor is characterized by the presence of two localized tissue types adjacently together. Gastric composite tumors are relatively rare. According to the reports on the Korean literature, there are several collision tumors, but only one case of gastric composite tumor has been cited. Reports of multiple synchronous or metachronous cancers have increased steadily during the last decades. Multiple gastric carcinoids or carcinoid tumors developed in association with gastric adenocarcinoma contribute to this trend. We report one case of gastric composite tumor simultaneously occurring with a early gastric adenocarcinoma with review of the literature. (Korean J Gastroenterol 2003;42:533-538)
상백피 추출물과 차나무 기름 제제가 여드름과 호기성 피부 상재균에 미치는 효과
유종엽 ( Yu Jong Yeob ),박서형 ( Park Seo Hyeong ),황인아 ( Hwang In A ),조성진 ( Jo Seong Jin ),허창훈 ( Heo Chang Hun ),윤상웅 ( Yun Sang Ung ),박경찬 ( Park Gyeong Chan ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.9
Background : The exact role of aerobic bacteria in the pathogenesis of acne remains controversial hut several reports showed (hat these microorganisms were important in the development of acne lesions and affected the severity of acne by being involved in