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수소화 처리된 InAs/GaAs 양자점 적외선 수광소자의 전기적 특성
남형도,송진동,최원준,조운조,이정일,최정우,양해석,Nam H.D.,Song J.D.,Choi W.J.,Cho W.J.,Lee J.I.,Choe J.W.,Yang H.S. 한국진공학회 2006 Applied Science and Convergence Technology Vol.15 No.2
InGaAs/GaAs 양자 우물 내에 삽입된 InAs 양자점으로 구성된 5층의 흡수층과 $Al_{0.3}Ga_{0.7}As/GaAs$ SL (superlattice) 암전류 장벽층을 갖는 QDIP (quantum dot infrared photodetector) 구조에 대한 수소 RF 플라즈마에 의한 수소화 처리가 QDIP의 전기적. 광학적 특성에 미치는 영향에 대해 연구하였다. RF 플라즈마 수소화 처리는 양자점의 밴드구조에 영향을 미치지 않았으며 $Al_{0.3}Ga_{0.7}As/GaAs$ SL 암전류 장벽층 내의 결함 제거 및 QDIP 구조 내 결함 생성을 동시에 유도함으로써 QDIP의 전기적 특성 향상은 수소 플라즈마 처리시간의 함수임을 알았다. 20 W의 수소 RF 플라즈마를 사용했을 때, 10분간의 플라즈마 조사가 가장 좋은 전기적 특성을 제공하여 높은 암전류 때문에 원시료에서는 측정 할 수 없었던 광전류 신호를 측정 할 수 있었다. In this paper, we investigated the effect of hydrogen-plasma (H-plasma) treatment on the electrical and optical properties of a quantum dot infrared photodetector (QDIP) with a 5-stacked InAs dots in an InGaAs/GaAs well structure and $Al_{0.3}Ga_{0.7}As/GaAs$ SL (superlattice) current blocking layer. It has been observed that H-plasma treatment didn't affect the band structure of QDIP. It has been also observed that the H-plasma treatment on the QDIP not only enhance the electrical property of QDIP by curing the defect channels in $Al_{0.3}Ga_{0.7}As/GaAs$ SL but also introduce defects in QDIP structure. The H-plasma treatment for 10 min with 20 W of RF power provided the lowest dark current, which made it possible to measure the photo-current (PC) of QDIP whose PC was not detectable without the H-plasma treatment due to the high dark current.
Introduction of virtual open chamber for testing a weather modification technique in Korea
J-W Cha,K-H Chang,M-J Lee,J-Y Jeong,J-W Jung,H-Y Yang,K-L Kim,Y-C Kim,C-H Kim,K-H Nam,M-K Suk,C-K Jung,H-Y Go,J-H Chae,G-W Lee,Y-H Cho,S-H Jung,H-M Park,Y-A Oh,J-Y Jung,B-G Kim,Y-J Kim,M-H Choi,S-D Ki 한국기상학회 2009 한국기상학회 학술대회 논문집 Vol.2009 No.4
Residual Multi-dilated convolution U-Net을 이용한 다중 심장 영역 분할 알고리즘 연구
임상헌 ( Sang-heon Lim ),최한승 ( H. S. Choi ),배희진 ( S. K. Jung ),정서경 ( J. K. Jung ),정진교 ( Myung-suk Lee ),이명숙 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.1
본 연구에서는 딥 러닝을 이용하여 완전 자동화된 다중 클래스 전체 심장 분할 알고리즘을 제안하였다. 제안된 방법은 recurrent convolutional block과 residual multi-dilated block을 삽입하여 기존 U-Net을 개선한 인공신경망 모델을 사용하였다. 평가는 자동화 분석 결과와 수동 평가를 비교하였다. 그 결과 96.88%의 평균 DSC, 95.60%의 정확도, 97.00%의 recall을 얻었다. 이 실험 결과는 제안된 방법이 다양한 심장 구조에서 효과적으로 구분되어 수행되었음을 알 수 있다. 본 연구에서 제안된 알고리즘이 의사와 방사선 의사가 영상을 판독하거나 임상 결정을 내리는데 보조적 역할을 할 것을 기대한다.
SCHOTTKY PROPERTIES OF ION BEAM DEPOSITED W-Si-N REFRACTORY CONTACTS ON GaAs
Park, C. S.,Lee, J. S.,Yang, J. W.,Shim, K. H.,Lee, J. H.,Choe, Y. K.,Kang, J. Y.,Ma, D. S.,Lee, J. Y. 대한전자공학회 1989 ICVC : International Conference on VLSI and CAD Vol.1 No.1
We first tried low energy ion beam assisted deposition (IBAD) of refractory W-Si-N films onto GaAs for application to gate electrode of metal-semiconductor field effect transistors (MESFET). This ion beam technique provides lower process pressure, and less ion damage to substrates and films than conventional reactive sputter-deposition. The Schottky diode characteristics of W-Si-N contacts on GaAs and their thermal stability were investigated after annealing at 700-900℃ for 30 min. The Schottky barrier heights of W/, WN_(0 27)/, and WSi_(0 3)N_(0 4)/GaAs diodes annealed at 850 were 0.71, 0.84, and 0.76 eV respectively, which are comparable to those of the best results obtained by the conventional sputtering.
Magnetism in Ni-W textured substrates for coated conductors
Song K. J.,Park Y. M.,Yang J. S.,Kim S. W.,Ko R. K.,Kim H. S.,Ha H. S,Oh S. S.,Park C.,Joo J. H.,Kim C. J. The Korea Institute of Applied Superconductivity a 2005 한국초전도저온공학회논문지 Vol.7 No.2
The magnetic properties of a series of both annealed (biaxially textured) and as-rolled (non-textured) Ni-xW alloy tapes with compositions x = 0,1,3, and 5 at.$\%$, were studied. Characterization methods included XRD analyses to investigate the biaxial cube texturing of the annealed Ni-W alloy tapes and studies of the magnetization M for both annealed and as-rolled Ni-W alloy tapes. Both the isothermal mass magnetizations M(H) of a series of samples at different fixed temperatures and M(T) in fixed field, employing a PPMS-9 (Quantum Design), were measured. The Ni-W alloys have shown much reduced ferromagnetism as W-content x increases. Both the saturation magnetization Msat and Curie temperature Tc decrease linearly with W-content x, and both Msat and Tc go to zero at critical concentration of Xc - 9.50 at. $\%$ W.
임상실습 간호대학생의 공감능력, 의사소통능력, 심리적 소진 간의 관계
고재원,김지은,박진영,서혜영,신유진,이동민,정다은,진서정,최서원,XIE WEI,YANG JING,배성희,손지희 이화여자대학교 간호학회 2018 이화간호학회지 Vol.- No.52
Purpose: The purpose of this study was to determine the relationship among empathy ability, communication ability, and psychological burnout in nursing students on clinical practice. Method: Data was collected using questionnaires between September 20th, 2017 to January 2th, 2018. Participants of this study were 159 of grade 3 and 4 nursing students who had completed at least one semester of clinical practice experience and currently attending universities located in Seoul. Data were analyzed using percentage, average, standard deviation, t-test, one-way ANOVA, Scheffe’s test and Pearson’s correlation coefficient using the SPSS WIN 24.0 program. Results: The empathy ability was positively correlated with communication ability(r=.437, p=.000). And the communication ability was negatively correlated with psychological burnout(r=-.390, p=.000). Also the empathy ability was negatively correlated with psychological burnout(r=-217, p=.006). Conclusion: These results suggest that psychological burnout is closely related to empathy ability and communication ability. Based on these results, empathy ability and communication ability need to be increased by efficient management and intervention to decrease the degree of psychological burnout in nursing students. Also, the findings should be considered when developing plans or education programs for nursing students’ major adjustment.
Yin, Q.Q.,Chang, J.,Zuo, R.Y.,Chen, L.Y.,Chen, Q.X.,Wei, X.Y.,Guan, Q.F.,Sun, J.W.,Zheng, Q.H.,Yang, X.,Ren, G.Z. Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.2
In order to improve the availability of phytase and probiotics together, a phytase gene from Aspergillus ficuum has been expressed in Lactobacillus. In this study, the transformed Lactobacillus with phytase gene was fed to pigs to determine its effect on pig production, feed conversion and gut microbes. Forty eight, 60-day-old, castrated pigs (Duroc${\times}$Landrace${\times}$Pietrain) were assigned to 6 groups, 8 pigs for each group. Group 1 was the control, group 2 was added with chlortetracycline (500 mg/kg), group 3 was added with the transformed Lactobacillus (500 mg/kg) with 20% (w/w) of calcium monohydrogen phosphate (CMP, $CaHPO_{4}$) removed, group 4 was added with the natural Lactobacillus (500 mg/kg) with 20% (w/w) of CMP removed, group 5 was added with the transformed Lactobacillus (500 mg/kg) with 40% (w/w) of CMP removed, group 6 was added with phytase (500 mg/kg) with 40% (w/w) of CMP removed. The results showed: i) the average daily gain (ADG) was improved in groups 2, 3 and 4 (p<0.05); ii) the diarrhea rates in the groups added with Lactobacillus were lower than in the other groups (p<0.05), in which the transformed Lactobacillus had more effect on reducing digestive disease; iii) the transformed Lactobacillus was most effective in improving the digestibilities of crude protein (CP), calcium (Ca), phosphorus (P), compared with the other groups (p<0.05); iv) Lactobacillus could increase lactic acid bacterium number and ammonia concentrations, and decrease pH values and E. coli number in pig feces (p<0.05); v) the phytase activity in the feces of pigs fed with the transformed Lactobacillus was 133.32 U/g, which was higher than in group 4 (9.58 U/g, p<0.05), and was almost the same as group 6 (135.94 U/g); vi) the transformed Lactobacillus could increase serum concentrations of IgA, triglyceride, and glutamic oxaloacetic transaminase activity (p<0.05), and had no significant effect on other serum indexes (p>0.05).