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흡수 계수와 흡수 계수 변화 특성에 따른 CdSe 양자 구슬 구조의 균일성 조사
황영남,신상훈,박승한,김웅,김동호,Hwang, Young-Nam,Shin, Sang-Hoon,Park, Seung-han,Kim, Ung,Kim, Dong-Ho 한국광학회 1997 한국광학회지 Vol.8 No.2
CdSe 양자 구슬 구조의 X선 회절 무늬를 조사하여 그 결정 구조가 육각 결정 구조임을 밝혔고, 선형 흡수 스펙트럼으로부터 양자 구속 효과에 의한 흡수 봉우리들이 나타남을 확인하였다. 에너지가 낮은 에너지 준위보다 높은 에너지 준위에 많은 전자-양공 짝을 만들었을 때, 낮은 에너지 준위에 대한 흡수 봉오리의 흡수 계수 변화가 작게 일어남을 관찰함으로써 띠내 전이의 선택률이 잘 지켜지고 있음을 확인하였다. 이로부터 실험에 사용된 CdSe 양자 구슬 구조가 크기 및 모양의 불규칙성으로 인한 불균일계라기 보다는 균일계로 기술되어짐을 밝혔다. The hexagonal wurtzite structure of CdSe quantum dots are investigated by X-ray diffraction experiment. The absorption peaks due to quantum confinement effect are observed in the linear absorption spectra. Absorption coefficient changes at the lowest transition are measured with pump wavelength at the lowest transition and at the next higher transition from which direct intraband transition is not allowed. The measured larger absorption changes at the lowest transition confirm that the selection rules of intraband transition resulting from quantum confinement effect are satisfied. From the experimental results, therefore, we concluded that the CdSe quantum dots can be described as homogeneous system.
황영남(Young Nam Whang),최규식(Kyu Sik Choi),김영자(Young Ja Kim),양윤모(Yoon Mo Yang),조승운(Seung Woon Cho),나정호(Jung Ho La),윤세옥(Sei Ok Yoon),이성공(Sung Kong Lee),윤영준(Young Joon Yoon),김희숙(Hee Sook Kim) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.3
Carcinoid tumors are slowly growing rare neoplasms that arise from argentaffin cells. In general, gastric carcinoids are very rare, constituting only 0.7-2.5% of all gastrointestinal carcinoids and approximately 0.3% of all gastric tumors. Gastric carcinod tumor commonly presents as a single polypoid mass and the most frequent site is the antral cavity. Clinical diagnosis is often difficult because the typical carcinoid syndrome is uncommon and nonspecific gastrointestinal symptoms are the more frequent clinical feature of this disease. Preoperative diagnosis is possible by large and deep endoscopic biopsies of the gastric wall. This paper presents a case of malignant gastric carcinoid tumor and a brief review of pertinent literature. A 52 year old female visited our medical hospital with the symptom of epigastric pain and indigestion for several months. Upper G-I series and gastrofiberscope showed malignat ulcerative lesion in the lesser curvature of the antral cavity. She had been operated under the diagnosis of gastric adenocarcinoma, but pathological findings demonstrated argyrophilic granules in tumor cell.