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InGaN/GaN 다중 양자우물 구조에서의 결정상 분리 현상 연구
이상준,김준오,김창수,노삼규,임기영,Lee, S.J.,Kim, J.O.,Kim, C.S.,Noh, S.K.,Lim, K.Y. 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.1
양자우물의 두께가 다른 4종류의 $In_xGa_{1-x}N(x=0.15)/GaN$ 다중 양자우물 구조의 PL 스펙트럼을 분석하여 InGaN에서의 결정상 분리 현상을 조사하였다. 우물폭이 1.5 nm에서 6.0 nm로 증가함에 따라, PL스펙트럼은 비대칭성이 점점 강해지는 이중 피크의 특성을 나타내었다. 곡선맞춤을 수행하여 분리한 2개의 피크를 분석하여, InGaN 우물에서의 부준위 천이에 해당하는 고에너지 피크의 세기는 줄어드는 반면, 상분리에 의하여 생성된 저에너지 피크의 강도는 점점 강해짐을 볼 수 있었다. 이것은 InGaN 우물에는 In 조성이 다소 다른 2개의 결정상이 존재하여, 우물폭 증가와 함께 InN 상분리가 강해지면서 In 조성이 큰(In-rich) InGaN 결정상이 상대적으로 증대됨을 보여 주는 결과로 해석된다. 우물 두께가 6.0 nm인 시료에서는 저에너지 영역(${\sim}2.0eV$)에서 또 하나의 피크이 관측되었는데, 이것은 GaN에서 잘 알려져 있는 결함에 기인한 황색준위(YB)와 그 근원이 같은 것으로, InN의 상분리가 임계값 이상으로 발달하여 생성된 결함과 관련된 준위인 것으로 해석된다. We have investigated photoluminescence(PL) spectra of four $In_xGa_{1-x}N(x=0.15)/GaN$ multiple quantum well(MQW) structures with different well widths in order to study a phenomenon on crystal phase separation. The asymmetic behavior of PL spectra becomes stronger with increase of the well width from 1.5 nm to 6.0 nm, which indicates dual-peak nature. Analyzing the dual-peak fit PL spectra, we have observed that the intensity of low-energy shoulder peak rapidly becomes stronger, compared to that of high-energy peak corresponding to a transition in InGaN QW. It suggests that InGaN QW has two phases with tiny different In compositions, and that In-rich(InN-like) phase forms more and more relatively than stoichiometric InGaN(x=0.15) phase by the InN phase separation mechanism as the QW width increases. PL spectrum of 6.0-nm sample shows an additional peak at low-energy lesion(${\sim}2.0\;eV$) whose energy position is almost the same as a defect band of yellow luminescence frequently observed in GaN epilayers. It may be due to a defect resulted from In deficiency formed with development of the phase separation.
김영민,이상준 濟州大學校工科大學産業技術硏究所 1996 尖端技術硏究所論文集 Vol.7 No.2
We studied a method of preprocessing for the off-line handwritten Hangul recognition. This paper propose a method that makes the input data consisted by point-data into a 8-direction regular form using the structural features of Hangul. We use the locational and structural information of each input data and fuzzy theory for 8-direction regularization. We test this method with the upper 422 handwritten Hangul that frequently occur in the plain text. As the result, we got the output data remaining the feature of input character.
이상준,정필상,임은석,윤경섭,이상훈 대한이비인후과학회 2007 대한이비인후과학회지 두경부외과학 Vol.50 No.8
Background and Objectives:The relationship betwen actinomycosis and chronic tonsillar diseases, such as chronic recurrent his study was to find out the incidence of actinomycosis in the tonsil and its clinical significance. Subjects and Method:A histologic evaluation with tonsil specimen for actinomycosis was done for 300 patients who had undergone tonsillectomy from July 2005 to February 2006. Other clinical features such as age, sex, chief complaints, tonsil size, frequency of recurent tonsillitis, and laboratory findings were also analyzed. Results:The incidence of actinomycosis in tonsil was significantly high in adult group. There was no significantly statistical diference in the rate of actinomycosis according to sex, chief complaints, tonsil size, frequency of recurrent tonsillitis, number of leukocytes, and hemoglobin. Conclusion:Actinomycosis sems to have no causal al tonsillar hypertrophy patients. (Korean J Otorhinolaryngol-Head Neck Surg 2007 ;50 :690-3)
이상준,김한호,안동환 한국농업경제학회 2005 農業經濟硏究 Vol.46 No.3
Using firm-level financial statement data, we investigated the performance of Korean food processing industry, especially focusing on the dynamics of productivity changes. Unlike the conventional production function framework, we employed a frontier function approach based on Luenberger's shortage function. The results showed that (i) productivity growth of food processing industry is attributable to technical progress rather than efficiency change; (ii) efficiency has improved after financial crisis in 1997. We also found that there exists significant differences in the pattern of productivity change among firm groups defined by firm characteristics such as SIC code, sales target, size, and ownership.
이상준,정필상,김영생,명나혜 대한이비인후과학회 2006 대한이비인후과학회지 두경부외과학 Vol.49 No.9
Actinomycosis is an uncommon disease caused by actinomyces species, which are gram-positive anaerobic bacteria with filamentousappearance. Actinomyces israelii is the most common pathogen resulting in actinomycotic infection. The infection usuallypresents 3 distinct localizations:cervicofacial, thoracic, abdomino-pelvic. Cervicofacial actinomycosis accounts for about 50%of the cases. The sulfur granule defines the pathognomic pathologic finding of actinomycosis, but it has been reported in only40% of cases. We report on a case of submandibular sialolithiasis that occurred due to antinomycosis in a 50-year old malepatient. (Korean J Otolaryngol 2006;49:949-51)