수소화된 비정질 규소와 다결정 규소 박막의 반송자 이동도

최유신,정세민,안두수,이준신 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.1

열처리는 규소 박막의 구조적, 광학적 성질뿐만 아니라 반송자 이동도 특성을 변화시킨다. 반송자 이동도는 주파수 응답 또는 시간 응답을 통해 소자의 동작에 영향을 끼친다. 본 논문은 수소화된 비정질 실리콘(a-Si:H)의 이동도 변화를 열처리 온도의 함수로써 살펴보았다. 이동도 측정에서 사용된 방법들에 대한 장단점들에 대해 검토하였다. 홀 효과와 Haynes-Shockley 방법은 a-Si:H 박막의 이동도 결정에 대한 오류를 나타내었다. TOF법은 a-Si:H에는 적용 가능하지만 높은 암전류때문에 다결정 실리콘(poly -Si)에는 적용할 수가 없다. 전도를 제한하는 공간전하, 박막 트랜지스터, 과도 전류 관찰방법등은 a-Si:H와 poly-Si의 이동도를 결정할 수 있었다. 규소 박막의 전계효과 이동도는 700℃이상의 고온처리와 RF 플라즈마 재수소화후에 20∼67㎠로 상승된 값을 얻었다. 우리는 박막 트랜지스터(TFT)와 과도 전류 관찰방법은 박막 실리콘 분석에 적당하다는 결론을 얻었다. The carrier mobility influences the device behavior through its frequency response or time response. This paper summarizes the mobility changes of the a-Si:H as a function of anneal temperature. The anneal treatment changes the carrier mobilities of thin film Si as well as optical and structural properties. The advantages and disadvantages were discussed for the employed methods in mobility measurement. Hall effect and Haynes-Shockley (HS) method exhibited some errors for a-Si:H mobility determination. A time of flight (TOF) method was attractive for the a-Si:H but not applicable for the poly-Si films because of high dark current. Space charge limited conduction (SCLC), thin film transistor (TFT), and transient current observation methods were able to determine the mobilities of a-Si:H and poly-Si films. A very high field effect mobility of 20-67㎠/V.s was observed after the high temperature anneal above 700℃, and grain boundary passivation using a RF plasma rehydrogenation. We learned that thin film transistor and transient current observation methods are suitable for the analysis of thin film Si.

迎日灣의 ECOSYSTEM 硏究 3. 水溫

尹伊鏞,朴相來,李東澈,金基台,崔銀珠,安由煥 嶺南大 海洋科學硏究所 1988 Marine Nature Vol.1 No.1

In order to observe hydrological characteristics in the Gulf of Yoeng-il, measurements of water temperature have been carried out from February to August 1983, and from August 1985 to December 1986. Surface water temperatures are closely linked to air temperature and solar-radiation for all littoral stations. Seasonal and annual variations of all horizontal stations are very similar to one another. Vertical variations of water temperatures for the stations located along the central-line of the Gulf are characteristic (and observed) as thermoclines and thermal stratification in the hottest summer-time (August). It is interesting to note that water column temperature of July and September are rather warmer than August, on account of a cold water mass coming from NE direction. For example, surface temperature in June 1982 was above 19℃, but the water below a depth of about 30m drastically drops to 4℃. It is indicative of invasion of water mass from cold current or deep sea.

A-Si:H/Cd 계면층을 이용한 a-Si:H의 결정화 연구

김도영,최유신,임동건,이준신,김홍우,이수홍 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-

We studied the crystallization of a-SiH thin film. Multi crystallized Si fillms are preferred in many applications such as FPD, solar cells, RAM, and integrated circuits. Because most of these applications require a low temperature process, we investigated a crystallization of a-SiH using a Cd layer. A metal Cd shows an eutectic point at a temperature of 321°C. THis paper present Cd layer assisted crystallization of a-SiH film for the various grain growth parameters such as anneal temperature. Cd layer thickness and anneal time.

강유전체 박막 커패시터 하부전극에 관한 연구

임동건,정세민,최유신,김도영,이준신 성균관대학교 1997 학술회의지원논문목록집 Vol.1997 No.-

We have investigated Pt and RuO₂as a bottom electrode for a device application of PZT thin film. The bottom electrodes were prepared by using an RF magnetron sputtering method. We studied some of the property influencing factors such as substrate temperature, gas flow ratem and RF power. An oxygen partial pressure from 0 to 50% was investigated. The results show that only Ru metal was grown without supplying any ‬O₂gas. Both Ru and RuO₂phases were formed for ‬O₂partial pressure between 10-40%. A pure RuO₂phasewas obtained with ‬O₂partial pressure of 50%. A substrate temperature from room temperature to 400°C was investigated with XRD for the film crystallinity examination. The substrate temperature influenced the surface morphology and the resistivity of Pt and RuO₂ as well as the film crystal structure. From the various considerations, we recommend the substrate temperature of 300°C for the bottom electrode growth. Because PZT film growth on top of bottom electrode requires a temperature process higher than 500°C, bottom electrode properties were investigated as a functiona of post anneal temperature. As post anneal temperature was increasedm the resistibity of Pt and RuO₂was decreased. However, almost no change was observed in resistibity for an anneal temperature higher than 700°C . From the studies on resistivity and surface morphology, we recommend a post anneal temperature less than 600°C.

迎日灣의 ECOSYSTEM 硏究 2. 기후적 要因 : 氣溫, 日射量, 증발량, 바람, 강우량

朴相來,金基台,崔銀珠,李東澈,安由煥,尹伊鏞 嶺南大 海洋科學硏究所 1988 Marine Nature Vol.1 No.1

In order to understand phytoplankton ecology in the Gulf of Yeong-il, climatic factors such as air-temperature, solar-radiation, evaporation, direction and strength of winds, and precipitation are studied from January 1982 to December 1985. Annual average of air-temperature during the four-years period is about 13.6C, ranging from 1.7C (January) to 26.5C (August). The maximum value of solarradiation is measured in spring (520MJm²in May), the minimun : in winter (62 MJm²in December, January or February), and the total annual value : about 4987MJm². Annual average of evaporation is about 1200mm (Maximum: 169 in May : Minimun: 56 in February), close to precipitation (about 1050mm). Annual average of strength of "North Winds" (350°-90°)is about 550m·sec for 156 frequences during 191 days, "West Winds" (170°-340°) : 511m·sec¹for 185 frequences during 148 days, and "South Winds" (100°-160°) about 61m·sec¹for frequences during 24 days. "N" winds is about 30% more violant than "W" winds, but both winds are influential in terms of water movements in the Gulf.

[PE-0057] Genetic Diversity and Genome-wide Association Study of Korean Soybean Landraces(Glycine max(L.) Merr.)

Yu-Mi Choi(Yu-Mi Choi),XiaoHan Wang(XiaoHan Wang),Hye-Myeong Yoon(Hye-Myeong Yoon),On-Sook Hur(On-Sook Hur),Na-Young Ro(Na-Young Ro),Ho-Cheol Ko(Ho-Cheol Ko),Jung-Yoon Yi(Jung-Yoon Yi) 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-

Poster Session:PS 1099 ; Gastroenterology (Gastrointestinal Tract) : A Case of Asymptomatic Perforated Appendicitis Presented as Subepithelial Sigmoid Colon Lesion during Screening Colonoscopy

( Yu Yi Choi ),( Su Jin Kim ),( Dong Ku Kang ),( Hyeong Seok Nam ),( Young Shin Shin ),( Dae Hwan Kang ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Acute appendicitis is a common disease in all age groups. Although many patients with acute appendicitis present with migrating abdominal pain, initial presentations can be atypical and nonspecifi c. Unusual manifestation can lead to diagnostic delays associated with an increased morbidity and mortality. Colonoscopic fi ndings for diagnosis of asymptomatic appendicitis include hyperemia and bulging at the appendiceal orifi ce area with surrounding mucosal edema, and drainage of pus from the appendiceal orifi ce. We report a case of asymptomatic perforated appendicitis and periappendiceal abscess presented as subepithelial sigmoid colon lesion during screening colonoscopy. Subepithelial lesion with pustular drainage and surrounded by hyperemic mucosa was seen at sigmoid colon during colonoscopy. CT revealed appendicitis and periappendiceal abscess with adjacent sigmoid colon wall thickening. The patient underwent appendectomy and fi nally diagnosed as perforated appendicitis with periappendiceal abscess.

Two cases of female hydrocele of the canal of nuck

Choi, Yu-Mi,Lee, Gyu-Min,Yi, Jung-Bin,Yoon, Kyung-Lim,Shim, Kye-Shik,Bae, Chong-Woo,Choi, Sung-Il,Kim, Hyun-Cheol The Korean Pediatric Society 2012 Clinical and Experimental Pediatrics (CEP) Vol.55 No.4

The processus vaginalis within the inguinal canal forms the canal of Nuck, which is a homolog of the processus vaginalis in women. Incomplete obliteration of the processus vaginalis causes indirect inguinal hernia or hydrocele of the canal of Nuck, a very rare condition in women. Here, we report 2 cases of hydrocele of the canal of Nuck that were diagnosed with ultrasonography in both cases and magnetic resonance imaging in 1 case to confirm the sonographic diagnosis. High ligation and hydrocelectomy were conducted in both patients. In 1 patient, 14 months later, the occurrence of contralateral inguinal hernia was suspected, but did not require surgery. The other patient had a history of surgery for left inguinal hernia 11 months before the occurrence of right hydrocele of the canal of Nuck. In both cases, the occurrence of an inguinal hernia on the contralateral side was noted.

Differences in Cotyledon Color and Harvest Period Affect the Contents of Major Isoflavones and Anthocyanins in Black Soybeans

( Yu-mi Choi ),( Hyemyeong Yoon ),( Myoung-jae Shin ),( Yoonjung Lee ),( Sukyeung Lee ),( On Sook Hur ),( Na Young Ro ),( Ho-cheol Ko ),( Jeongyoon Yi ),( Sang Hoon Lee ),( Heon-woong Kim ),( Yu Jin H 한국육종학회 2021 Plant Breeding and Biotechnology Vol.9 No.1

Several environmental and genetic factors affect the isoflavone and anthocyanin contents in soybeans. This study aimed to assess the influences of cotyledon color and harvest period on the contents of five major isoflavones and three major anthocyanins in 323 black soybean landraces grown in Korea. In all the soybeans, malonylgenistin, malonyldaidzin and cyanidin-3-O-glucoside were the foremost components. The total isoflavone (TIC) and total anthocyanin (TAC) contents were in the ranges of 491.29-1998.39 μg/g and 452.60-2789.37 mg/100 g on dry weight basis, respectively. Both the average TIC and TAC were higher in green cotyledon soybeans (1493.93 μg/g and 1656.05 mg/100 g, respectively) than in yellow cotyledon soybeans (1423.09 μg/g and 1489.30 mg/100 g, respectively). With respect to the harvest period, the average TIC was in the order of Late-October (1517.31 μg/g) > Mid-October (1454.54 μg/g) > Early-October (1340.95 μg/g). Moreover, the average TAC decreased in the order of Late-October (1765.76 mg/100 g) > Mid-October (1503.93 mg/100 g) > Early-October (1350.91 mg/100 g). In general, cotyledon color appeared to cause a significant variation on TAC (P < 0.05) but not on TIC, whereas the harvest period appeared to cause significant variations on both the TAC and TIC. Among the 323 landraces, 20 were identified to contain high TIC ( > 1800 μg/g) and TAC (> 2000 mg/100 g) in their seeds and hence, could be considered as important sources of dietary isoflavones and anthocyanins. Besides, they possibly provide a wide spectrum of options if considered during the development of improved soybean genotypes.

소화기 ; 검진 내시경 상 구불 결장의 상피하 병변으로 관찰된 충수염 1예

최유이 ( Yu Yi Choi ),김수진 ( Su Jin Kim ),강대환 ( Dae Hwan Kang ),김형욱 ( Hyung Wook Kim ),최철웅 ( Cheol Woong Choi ),오숙경 ( Sook Kyoung Oh ),신영신 ( Young Shin Shin ) 대한내과학회 2015 대한내과학회지 Vol.89 No.5

본 증례는 검진 목적의 대장내시경에서 충수돌기 개구부가 정상 소견을 보였지만, 구불결장의 점막하 병변으로 나타난 충수염의 드문 증례이다. 화농성 배액이 보이는 점막하 병변이 구불 결장에서 관찰될 때 충수염의 가능성 또한 감별진단으로 고려해 볼 수 있겠다. Acute appendicitis is common in all age groups. Although many patients with acuteappendicitis present with migrating abdominal pain, the initial presentation can be atypical and nonspecific. Unusual manifestations can lead to diagnostic delay, which is associated with increased morbidity and mortality. Colonoscopic findings suggestinga diagnosis of asymptomatic appendicitis include hyperemia and bulging at the appendiceal orifice area with surrounding mucosal edema, and drainage of pus from the appendiceal orifice. We report a case of asymptomatic perforated appendicitis and periappendiceal abscess that presented as a subepithelial sigmoid colon lesion at screening colonoscopy. On colonoscopy, a subepithelial lesion with pustular drainage surrounded by hyperemic mucosa was seen at the sigmoid colon. Computed tomography revealed appendicitis and a periappendiceal abscess with adjacent sigmoid colon wall thickening. The patient underwent an appendectomy, with a final diagnosis of a perforated appendicitis with a periappendiceal abscess. (Korean J Med 2015,89:548-552)