Cs이 흡착된 Si(111)7×7표면에 대한 RHEED연구

박종윤,이순보,이경원,안기석,강건아 성균관대학교 1991 論文集 Vol.42 No.1

Cesium-adsorbed surface structures on Si(111)7×7 were investigated at room and high temperatures(200∼700℃) by RHEED. The RHEED patterns of Si(111) 7×7 was changed to the modified 7×7 and the 1×1 patterns with increasing the deposition times of Cs at RT. It was observed that the structure of the Cs-adsorbed Si (111) 7×7 surface at saturation coverage is the 1×1 structure at RT. The ◁그림삽입▷(원문을 참조하세요) 1 and 1×1 structures appeared successively at the adsorption temperature of 300℃, 350∼400℃ and 450℃, respectively. After subsequent heating of 1×1 surface above 550℃ and of ◁그림삽입▷(원문을 참조하세요) surface above 600℃, each RHEED pattern gradually returned to the original Si(111)7×7 pattern. 상온 및 200∼700℃의 Si(111)7×7 표면에 Cs(Cesium)을 증착하였을 때 표면격자구조의 변화를 RHEED로 관측하였다. Cs 증착시 Si(111)7×7 기판의 온도가 상온인 경우, 포화 덮임률에 도달했다고 추정되는 일정 증착시간 전에는 원래의 깨끗한 Si(111)7×7 패턴과 거의 유사한 변형된(modified) Si(111)7×7-Cs 패턴이 관측되었다. 그후 포화 덮임률에서는 1×1패턴이 관측되고 증착량을 증가시켜도 패턴의 변화는 관측되지 않았다. 이 구조를 다시 annealing시키면 약 550℃부터 서서히 원래의 7×7구조로 되돌아가기 시작한다. Si(111)7×7기판의 온도를 220∼700℃로 유지하면서 Cs을 증착시킨 경우에 약 250℃까지는 상온에서와 비슷한 변형된(modified) 7×7이 관측되고 약 300℃에서는 ◁그림삽입▷(원문을 참조하세요) 350∼400℃ 정도에서는 ◁그림삽입▷(원문을 참조하세요)과 3×1이 겹쳐셔 관측되었다. 그리고 450℃ 이상에서는 1×1구조가 관측되었다. 이때 약 300℃에서 형성된 ◁그림삽입▷(원문을 참조하세요) 350℃에서 형성된 ◁그림삽입▷(원문을 참조하세요) 3+3×1 구조는 약 500℃ 정도까지 다시 annealing함에 따라 다리 1×1구조로 상전이가 일어난후, 약 600℃부터 원래의 7×7의 초격자점들이 나타나기 시작했다. 이들 결과로부터 Si(111)7×7 표면에 Cs을 증착하는 경우에는 일정한 포화 덮임률(saturation coverage)이 있는 것으로 추정되고, 이 덮임률에서 관측된 고온에서의 상전이는 증착량(증착시간)에는 무관하고 온도에만 의존함을 알 수 있었다. 또한 1×1 구조와 ◁그림삽입▷(원문을 참조하세요) 구조에 대하여 Cs의 탈착은 각각 약 550℃와 600℃에서 일어나기 시작하여 700℃에서 완전히 탈착됨을 알 수 있었다.

제2형 당뇨병 환자에서 우연히 발견된 기종성 방광염 1례

박보민,김윤정,이영태,노정현,권수경,김동준,고경수,이병두,임경호,이순희,박정현 白中央醫療院 2005 仁濟醫學 Vol.26 No.1

Emphysematous cystitis is an uncommon disease in which bacterias produce gas within the bladder wall and surrounding tissue. Patients with diabetes, neurogenic bladder and chronic urinary tract infection are predisposed to the disease. It is usually caused by E.coli and Klebsiella. Severity of illness ranges from an asymtomatic condition to life threatening cystitis. Succesful management depends on early diagnosis with correction of underlying causes, administration of appropriate antibiotics, establishment of adequate bladder drainage and surgical excision of involved tissue when required. We report a case of 52-year-old woman who did not compain of symtoms of cystitis but epigastric pain, nausea, and vomitting. Emphysematous cystitis was revealed on the abdominal X-ray series incidentally. CT scans of the pelvis showed mottled gas bubble within the bladder. After treatment, the symtoms subsided and plain abdominal film showed no evidence of gas shadow in the pelvic cavity.

조직배양에서 얻어진 쪽파의 유전적 변이체들이 보여주는 단백질과 Isozyme의 유형분석

朴敬淑,李在悅,徐奉甫 慶北大學校 1992 論文集 Vol.52 No.-

Some genetic variants of Amphihaploid, Hypoamphidiploid, Amphidiploid are regenerated from tissue culture in Allium wakegi. They were applied to investigate the effects of the chromosomal differences on the gene expression of some isozymes. The electrophoretic migration patterns of total proteins were different at the position of MW5×10^5 Dalton among the genetic variants. Three different isozymes were characterized from the migration patterns of isozymes in the discontinuous polyacrylamide gel electrophoresis. Alcohol dehydrogenase(ADH) appeared 3 bands in the gel electrophoresis corresponding to 3 isozymes, that is allozymes distributed as single isozyme in each individual. Isocitric acid dehydrogenase(ICDH) appeared 5 bands in the gel and corresponds to 5 isozymes as allozymes which distributed single isozyme in each individual. Phosphoglucoisomerase(PGI) appeared 8 bands in electrophoresis and to 8 isozymes which originated from 2 genes and distributed more than two isozumes in each individual. According to the isozume expression in the genetic variants of Allium wagegi, the amplification of chromosomal numbers can affect neither to increase the isozyme numbers and concentration nor to express heterogeneous types in the genetic variants.

항암제 AG60이 흰생쥐 위점막 상피세포의 DNA합성에 미치는 영향 : 자기방사법적연구

박경호,안의태,고정식,하상선,한영복,정영신,홍은경,유보림,김상건,이경영,강종구 대한해부학회 1999 Anatomy & Cell Biology Vol.32 No.1

K이 흡착된 Si(111)7×7표면에 대한 RHEED 연구

박종윤,이순보,이경원,안기석,신익조,강건아 성균관대학교 1990 論文集 Vol.41 No.2

상온 및 200℃∼600℃의 Si(111) 7×7 표면에 칼륨(K)을 증착하였을 때의 표면격자구조 변화를 RHEED로 관측하였다. K 증착시 Si(111)7×7 기판의 온도가 상온인 경우, 어느 일정한 증착시간(포화덮임률에 도달했다고 추정되는 증착시간)이 지난 후에는 원래의 깨끗한 Si(111)7×7 패턴과 유사한 Si(111) 7×7-K 패턴이 관측되었고, 증착시간을 증가시켜도 RHEED 패턴은 변화하지 않았다. 이것을 annealing하면 350℃까지는 RHEED 패턴에 변화가 없다가 그 이상의 온도가 되면 서서히 원래의 7×7 패턴으로 되돌아가기 시작한다. Si(111) 7×7기판의 온도를 200℃∼600℃로 유지하면서 K을 일정시간(450℃에서 3×1이 형성되는 증착시간)이상 증착시킨 경우에 250℃까지는 상온의 경우와 비슷한 형태의 변형된 7×7 패턴이 관측되고, 300℃∼550℃일때는 3×1, 550℃ 이상에서는 1×1 구조가 관측되었다. 이때 300℃∼550℃에서 형성된 Si(111) 3×1-K 구조는 450℃에서 1분 정도 annealing 하면 항상 Si(111) 1×1-K 구조로 상전이가 일어남을 관측하였다. Potassium adsorbed surface structures of Si(111) 7×7 surface at room and high temperatures(200℃∼600℃) were investigated by RHEED. Potassium adsorption on the Si(111) 7×7 surface to saturated coverage at room temperature changed the RHEED pattern of Si(111) 7×7 to Si(111) 7×7-K. Subsequent heating of the Si(111) 7×7-K surface above 350℃ results in a Si(111) 7×7 with desorbing K. The RHEED pattern of the K-adsorbed on the Si(111) 7×7 surface up to the adsorption temperature of 250℃ was the modified 7×7 pattern, quite similar to that of the Si(111) 7×7-K, observed at room temperature. The 3×1 structure was observed in the temperature of adsorption between 300℃ and 550℃. Regardless of the adsorption temperature, a phase transition always took place from the Si(111) 3×1-K structure to Si(111) 1×1-K after annealing at 450℃ over 1 minute.

Short‑Term Load Forecasting Based on Deep Neural Networks Using LSTM Layer

Bo‑Sung Kwon,Rae‑Jun Park,Kyung‑Bin Song 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4

Short-term load forecasting (STLF) is essential for power system operation. STLF based on deep neural network using LSTM layer is proposed. In order to apply the forecasting method to STLF, the input features are separated into historical and prediction data. Historical data are input to long short-term memory (LSTM) layer to model the relationships between past observed data. The outputs of the LSTM layer are incorporated with outputs of fully-connected layer in which prediction data, for instance weather information for forecasting day, are input. The optimal parameters of the proposed forecasting method are selected following several experiment. The proposed method is expected to contribute to stable power system operation by providing a precise load forecasting.

토론식 문학수업을 통한 학생인성교육 : 브레히트의 『코카서스의 백묵원』과 뒤렌마트의 『천사 바빌론에 오다』를 중심으로 "Der Kaukasische Kreidekreis" and Friedrich Durrenmatt's "Ein Engel kommt nach Babylon"

박보경 이화여자대학교 교육대학원 2002 이화교육논총 Vol.12 No.-

This paper is a study on Bertolt Brecht's "Der Kaukasische Kreidekreis" and Friedrich Du¨rrenmatt's "Ein Engel kommt nach Babylon" as a material of practical educational program of the literary works for education of human character in high school. Bertolt Brecht and Friedrich Du¨rrenmatt are among the German modern dramatists who handle criticism and a satire of modern politics and society in their own style. In the 20^th century, rapid development of science technology and that of industrial society brought about the tragic situation like the ignorance of human dignity, the use of human as slavery and the means of something. There is no exception to school education. Although we put the high value on the high technological situation given by development of science civilization and technology, the worth and the importance of human itself was gradually decreased. Moreover our special importance cannot but give stress to the acute entrance examination in our current educational environment for high school on modern materialism. Thus, there is rare chance of education of human character. It is a natural result that modern literature is in charge of role which criticize the whole field of society; social contradiction and hypocrisy, wariness for science and materialism, modern human's anxiousness and alienation, humanity loss in modern society, and etc. Hence we can expect the positive effects on improvement of lack of human character education and convince of students barren emotion point of view through a study on how to make literary work criticize society and cope with in each situation. I'm looking forward to students' reconsidering justice and truth through analysis for new law and justice by judge Azdak who appears in the confused age in "Der Kaukasische Kreidekreis". Besides, it is expected that mature opinion and thinking can be changed through discussion after careful consideration about the true meaning of nation with "Ein Engel kommt nach Babylon". After their closing a discussion of literary works, I hope that students will get the chance of human character education for themselves through suggestions on the subject of discussion and educational discussion with analysis of literary works. Furthemore, I expect that students can build up their own advanced values and erect the basis of morality.

미용관련과 재학생들의 교육과정만족도

박보경,김강련 고신대학교 보건과학연구소 2006 보건과학연구소보 Vol.16 No.-

This study was carried out to improve the curricula of the two-year college courses related to beauty-care. The survey was focused to investigate the satisfaction in their majors, educational process, and course management of beauty-care students. Various questions were asked the student groups attending at the colleges in Busan. The satisfaction to their curricula was more related to the overall satisfaction rate in the course than that with the management of the curricula. The statistical analysis and interpretation of this survey was described in detail. Consequently, the beauty-care related colleges may need to develop the diversified educational system, including the customized education for the aptitude of each student, rather than to put more efforts into the hardware part, such as the investment of facilities.

서울시내 일부 고등학교 학생들에서 학업성취도가 우울 증상에 미치는 영향

박혜숙,최경희,이보은 韓國學校保健學會 2001 韓國學校保健學會誌 Vol.14 No.2

Depression is one of the most common psychologic disorder and dealt as a major public health concern. School students have heavy school work loads and stress from various evaluations representing school performance. In this study, to examine the effect of school performance and stress on depressive symptoms, we assessed the frequency of risk factors for depressive symptoms among 2,717 high school students. From April 2001 to May 2001, using a self-reported questionnaire, we collected data on the frequency of occurrence of depressive symptoms and potential risk factors for depressive symptoms. Depressive symptoms were measured using Center Epidemiologlc Studies Depression (DES-D) index. Thirty-seven percent of high school students reported having high depressive symptoms for a week Female students had a higher prevalence of depressive symptoms than males (OR=1.44, 95% CI 1.22-1.70). In a multiple logistic regression model, we found that good perceived school performance (OR=0.43, 95% CI 0.31-0.60) had a negative association with depressive symptoms. On the contrary, we also found that stress from school performance (OR=2.03, 95% CI 1.69-2.44) associated with high depressive symptoms. In conclusion, high school students had a relatively high prevalence of depressive symptoms. Students with stress from school performance had the higher risk far depressive symptoms. Key words : Depression, risk factors, prevalence, performance, youths

집적화된 실리콘 압력센서의 출력전압 보상파라미터 추출 및 그 특성

이보나,김건년,박효덕,신상모,이경탁,김찬,권혁채,이상조,박현주 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

An integrated silicon pressure sensor has been designed, fabricated and tested. The signal conditioning circuits were designed to include calibration and temperature compensation of output voltage through trimming of diffusion and ion-implanted resistors. Before trimming of resistors, the compensation parameters such as pressure sensitivity, temperature coefficient of pressure sensitivity, temperature coefficient of piezoresistors and pressure sensitivity of piezoresistors were measured. Then offset voltage, span, and temperature coefficients of offset voltage and span were calibrated by trimming of resistors. The measured output voltage met our design specification and simulation value above room temperature. But, the measured output voltage at -30°C deviated from our design specification and simulation value because the offset voltages were found to vary randomly as a function of temperature.