Si-Schottky障壁型의 大陽電池 製作에 관한 硏究

李相潤,羅炳旭,朴德圭,李鍾德,金奎用,玄東杰,禹洪,盧景錫 慶北大學校 物理化學硏究所 1981 硏究論文集 Vol.1-2 No.-

The characteristics of these Si-schottky barrier type and Heterojunction type solar cells are as follows; 1. SnO_2/n-Si Heterojunction Solar Cells Fabricated by Spray Pyrolysis Method SnO_2 film were deposited on the (100) or (111) surface of Si single crystal by the spray pyrolysis method. The best SnO_2/n-Si solar cell has a good performance, with an open-circult voltage: Voc.=0.45V, short circuit current: Isc.=35.5㎃, fill factor: FF.=0.64, and conversion efficiency: η=10.2% under 98㎽/㎠ irradiation of AMl. The spray pyrolysis described in this paper is simple and suitable for mass production. One possibility for cost reduction lies in this method of junction fabrication, and the idea of simply deposited SnO_2/n-Si junction is, at first sight, very attractive. Hence the SnO_2/n-Si Solar Cell and the effectiveness of this method may be of great value in some future production of low-cost solar cells. 2. In_2O_3: Sn Heterojunction Solar Cells Fabricated by Spray Pyrolitic Method Highly conductive and transparent thin films of In_2O_3: Sn (ITO) are fabricated by spray pyrolytic method. The parameters of these thin films are as follows: resistivity ρ = 1.5×10 exp (-3) Ω·㎝, carrier concentration n = 7.5×10 exp (19) cm^-3, mobility μ = 55.5 ㎠/V·sec and transmission 85-90% over visible and long wave-length region. These thin films have simple cubic system with lattice constant 10.2Å. In_2O_3: Sn/n-Si heterojunction solar cells are fabricated, depositing In_2O_3: Sn (ITO) thin films on n-Si substrates with orientation(100) and resistively 2-3Ω, ㎝ by spray pyrolitic method. Under AMl sunlight simulator, the parameters of the excellent cell obtained has open-circuit voltage Voc=0.52V, short-circuit current I_sc=39.0㎃, fill factor: F.F=0.60 and conversion efficiencyη=12.1%. 3. Al/p-Si MOS Solar Cells Fabricated by Vacuum Evaporation Method Al/p-Si MOS solar cells, consisting of Al on P-tupe silicon with a thin interfacial layer of SiO_2 have been found to have good light conversion efficiency for solar radiation. The effects of the oxide layer thickness between metal and substrate were investigated. Under AMl simulated sunlight illumination the best cell has open circuit voltage Voc=0.50V, short-circuit current I_sc=26.3㎃/㎠, fill-factor FF=0.70 and conversion efficiency η=9.2%. 4. Cr-Cu/P-Si MOS Solar Cells Fabricated by Vacuum Evaporation Method Cr-Cu/p-Si MOS Solar cells, consisting of Cr-Cu on p-type silicon with a thin interfacial layer of SiO_2 have been found to have good light conversion efficiency for solar radiation. The effects of the oxide layer thickness between metal and substrate were investigated. Under AMl simulated sunlight illumination the best cell has open circuit voltage Voc=0.49V, short-circuit current I_sc=26.4㎃, fill-factor: FF=0.72 and conversion efficiency η=9.3%.

ZnS 螢光體의 結晶構造轉移에 따른 Photoluminescence 硏究

朴鍾允,李悳源,洪泰植 성균관대학교 기초과학연구소 1985 論文集 Vol.36 No.1

A comprehensive study of ZnS : [Zn] and ZnS ; [Zn] Cu phosphors has been carried out by examining spectral distribution curves of emission during excitation by ultraviolet (3650 Å). Transition from the cubic form to the hexagonal one in crystal structure of ZnS occured at 1150℃. There were maximum peaks position in luminescence spectra of cubic and hexagonal structure at about 4650 Å and 4500 Å, respectively. By doping Cu as an impurity, maximum peak positions in both case were shifted to the long wavelength. These phenomena seem to be caused by interstitial defect due to impurity.

장거리 해저 광전송망 분산보상 설계 및 구현

유재덕(Jae Duck Yoo),박홍태(Hong Tae Park),신현식(Hyun Sik Shin),김천석(Chun Suk Kim),신윤호(Yun Ho Shin) 한국전자통신학회 2006 한국전자통신학회 논문지 Vol.1 No.1

현재 국내.외 기간 통신망은 급격히 증가하는 고속 대용량 트래픽을 효율적으로 멀리 전송하기 위해 광증폭기를 이용한 파장분할다중화방식 (DWDM:Dense Wavelength Division Multiplexing) 광전송 시스템 통신망을 구축하고 있다. DWDM광전송 시스템에서 고속, 대용량 및 장거리 전송을 하기 위해서는 기존 3R 광 중계기시스템에서 크게 중요시 않았던 광 fiber의 비선형(non-linearity) 전송제약 요소를 고려하여 통신망을 설계하여야 한다. 광통신망에서 장거리 전송 시 신호펄스 파형의 왜곡을 최소화하기 위해 영분산(zero-dispersion)을 구현하여야 하지만, 영분산으로 인하여 파이버의 비선형 현상이 나타나 신호 스펙트럼 왜곡 현상이 발생하는 문제가 있다. 즉 영 분산과 파이버의 비선형 사이에 서로 상충관계를 해결하여야 고속 대용량 트랙픽을 장거리 전송할 수 있다. 본 논문에서는 DWDM 해저 광 통신망에서 고속 대용량 트래픽을 장거리 전송하기 위한 기술을 알아보고, 영분산과 파이버의 비선형 사이에 상충문제를 해결 위한 분산관리 기법을 소개하고, 실제한국-홍콩간 해저 광통신 구간에서 분산 맵 (dispersion map)을 설계 구현하였다. Currently, Most of the Backhual and Submarine s networks are being installed using DWDM and EDFA to deal with dramatically increasing internet traffic. In a conventional type optical system, the so-called 3R repeater, fiber non- linearity was not significant factor but it is one of the most important consideration when designing new DWDM network based on the EDFAs. To minimize the signal pulse distortion in long-haul optical network, Zero-dispersion fiber is indispensable but causes the fiber non-linearity. Therefore this conflicting problems should be managed to transmit a high-speed capacity traffic. In this paper, key technologies in DWDM submarine optic network were found out for a high capacity traffic and introduced the dispersion management way for solving the conflicting problems between Zero-dispersion and non-linearity. Lastly designed a dispersion map in section between Korea and Hong-kong.

高效率 시리콘 太陽電池의 硏究 : Ti/p-Si, MIS Inversion and Heterojunction Type Solar Cells Fabricated by Bacuum Evaporation and Spray Pyrolysis Methods

羅炳旭,李相潤,朴德圭,李鍾德,禹洪,盧景錫 慶北大學校 物理化學硏究所 1982 硏究論文集 Vol.3 No.-

1. Ti/p-Si Solar cell Fabricated by Vacuum Evaporation Titanium thin film was deposited on the chemically etched (100) surface of silicon single crystal by the vacuum evaporation. The interfacial oxide was grown by ramp heating. The Ti/p-Si solar cells have shown good rectification properties with the 0.78 V built-in potential and the 20 ㎂/㎠ reverse saturation current density in dark. The best cell have 0.58 V open circuit voltage, 38.0 ㎃/㎠ short circuit photocurrent density 0.64 fill factor and 13.9 % energy conversion efficiency under 100 ㎽/㎠ tungsten halogen lamp irradiation. Therefore, this solar cell is a very promising one, but the life testing is not performed yet in out laboratory. 2. Al/p-Si Solar Cell with Fine Grid and Inversion Layer The fabrication procedure and properties of MIS inversion solar cells forming a fine grating pattern of aluminium evaporated onto p-type silicon single crystal are discribed. The finest grating line width achieved in these cells described here were about 30 ㎛, and the smallest spacings were about 120 ㎛. The proper temperature for oxide growing of these cells was found to be about 450℃ for 20 minutes with oxygen flow. Under 100 ㎽/㎠ of irradiation of sunlight and using the antireflective coating of tnataliumsilicafilm spun on these cells, the short circuit photocurrent density, open circuit voltage and energy conversion efficiency were 28.0 ㎃/㎠, 0.545 V and 11 % respectively. 3. Heterojunction Type Solar Cell In_2O_3: Sn and SnO_2 films were deposited on the (100) surface of silicon single crystal by the spray pyrolysis method. The properties of these cells have good rectification with open circuit voltage, the short circuit photocurrent density, fill factor and energy conversion efficiency of 0.52V, 39.3㎃/㎠, 0.63 and 12.9 %, for In_2O_3: Sn/n-Si heterojunction solar cell and of 0.45V, 35.5 ㎃/㎠, 10.2%, for SnO_2/n-Si cell, respectively.

개에서 관찰된 모기질세포종의 증례보고

조성환,손화영,김혜성,최종윤,류시윤,박배근,윤원기,홍성혁,김덕환 충남대학교 수의과대학 동물의과학연구소 2002 動物醫科學硏究誌 Vol.10 No.-

Pilomatricoma was histopathologically diagnosed in a 2.5-year-old male Alaskan malamute. The patient was referred to Chungnam National University, Veterinary Medical Teaching Hospital with solitary, firm and well-circumscribed mass at shoulder. Grossly, the mass was dome shaped to tumor like and 10 x 8 x 5㎝ in size. Some lesions had gritty or bony consistency and was chalky when sectioned Histopathologic feature included mumerous clusters of tightly arranged, basaloid cells with evenly distributed chromatin and ghost cells were characterized by a central unstained zone. The ghost cells often become calcified and osseous metaplasia was also present.

Radiotherapy diagnostic biomarkers in radioresistant human H460 lung cancer stem-like cells

Yun, Hong Shik,Baek, Jeong-Hwa,Yim, Ji-Hye,Um, Hong-Duck,Park, Jong Kuk,Song, Jie-Young,Park, In-Chul,Kim, Jae-Sung,Lee, Su-Jae,Lee, Chang-Woo,Hwang, Sang-Gu TaylorFrancis 2016 Cancer Biology & Therapy Vol.17 No.2

<P><B>ABSTRACT</B></P><P>Tumor cell radioresistance is a major contributor to radiotherapy failure, highlighting the importance of identifying predictive biomarkers for radioresistance. In this work, we established a radioresistant H460 (RR-H460) cell line from parental radiosensitive H460 lung cancer cells by exposure to fractionated radiation. The radiation-resistant, anti-apoptotic phenotype of RR-H460 cell lines was confirmed by their enhanced clonogenic survival and increased expression of the radioresistance genes Hsp90 and Her-3. RR-H460 cells displayed characteristics of cancer stem-like cells (CSCs), including induction of the surface marker CD44 and stem cell markers Nanog, Oct4, and Sox2. RR-H460 cells also exhibited sphere formation and malignant behavior, further supporting a CSC phenotype. Using proteomic analyses, we identified 8 proteins that were up-regulated in RR-H460 CSC lines and therefore potentially involved in radioresistance and CSC-related biological processes. Notably, 4 of these—PAI-2, NOMO2, KLC4, and PLOD3—have not been previously linked to radioresistance. Depletion of these individual genes sensitized RR-H460 cells to radiotoxicity and additively enhancing radiation-induced apoptosis. Our findings suggest the possibility of integrating molecular targeted therapy with radiotherapy as a strategy for resolving the radioresistance of lung tumors.</P>

Treatment strategies using adefovir dipivoxil for individuals with lamivudine-resistant chronic hepatitis B.

Yun, Tae Jung,Jung, Jin Yong,Kim, Chang Ha,Um, Soon Ho,An, Hyonggin,Seo, Yeon Seok,Kim, Jin Dong,Yim, Hyung Joon,Keum, Bora,Kim, Yong Sik,Jeen, Yoon Tae,Lee, Hong Sik,Chun, Hoon Jai,Kim, Chang Duck,Ry WJG Press 2012 WORLD JOURNAL OF GASTROENTEROLOGY Vol.18 No.47

<P>To investigate retrospectively the long-term efficacy of various treatment strategies using adefovir dipivoxil (adefovir) in patients with lamivudine-resistant chronic hepatitis B.</P>

대량 출혈을 일으킨 원발성 위 Carcinoid 종양 1예

홍윤식,김창덕,류호상,현진해,김종웅,황일순,송태진,김혜랑 대한소화기내시경학회 1989 Clinical Endoscopy Vol.9 No.1

Carcinoid tumor of stomach continue to interest clinician because of the rarity and difficulty in diagnosis clioically with infrequent classical carcinoid syndrome. Recently, we experienced a case of gastric carcinoid with hemetemesis and melena. We feel that this case is an instructive example of the fascinating variety of entities which can result in massive upper gastrointestinal bleeding. So we present this case with s review of relevant literatures.

Rancidity Prediction of Soybean Oil by Using Near-Infrared Spectroscopy Techniques

Hong, Suk-Ju,Lee, Ah-Yeong,Han, Yun-hyeok,Park, Jongmin,So, Jung Duck,Kim, Ghiseok Korean Society for Agricultural Machinery 2018 바이오시스템공학 Vol.43 No.3

Purpose: This study evaluated the feasibility of a near-infrared spectroscopy technique for the rancidity prediction of soybean oil. Methods: A near-infrared spectroscopy technique was used to evaluate the rancidity of soybean oils which were artificially deteriorated. A soybean oil sample was collected, and the acid values were measured using titrimetric analysis. In addition, the transmission spectra of the samples were obtained for whole test periods. The prediction model for the acid value was constructed by using a partial least-squares regression (PLSR) technique and the appropriate spectrum preprocessing methods. Furthermore, optimal wavelength selection methods such as variable importance in projection (VIP) and bootstrap of beta coefficients were applied to select the most appropriate variables from the preprocessed spectra. Results: There were significantly different increases in the acid values from the sixth days onwards during the 14-day test period. In addition, it was observed that the NIR spectra that exhibited intense absorption at 1,195 nm and 1,410 nm could indicate the degradation of soybean oil. The PLSR model developed using the Savitzky-Golay $2^{nd}$ order derivative method for preprocessing exhibited the highest performance in predicting the acid value of soybean oil samples. onclusions: The study helped establish the feasibility of predicting the rancidity of the soybean oil (using its acid value) by means of a NIR spectroscopy together with optimal variable selection methods successfully. The experimental results suggested that the wavelengths of 1,150 nm and 1,450 nm, which were highly correlated with the largest absorption by the second and first overtone of the C-H, O-H stretch vibrational transition, were caused by the deterioration of soybean oil.

A New Black Soybean Cultivar, “Cheongja 3” with Green Cotyledon,Medium-late Maturity and High Anthocyanin

Hong-Tae Yun,Won-Young Han,In-Youl Baek,Doo-Chull Shin,Jong-Min Ko,Nam-Suk Kang,Chan-Sik Jung,Sea-Kwan Oh,Myoung-Gun Choung,Sung-Taeg Kang,Duck-Yong Suh,Ho-Yeong Kim,Dong-Kwan Kim,Chang-Ki Son 한국육종학회 2005 한국육종학회지 Vol.37 No.5

A new black seed coated soybean cultivar with green cotyledon, Cheongja 3 was developed at the National Institute ofCrop Science (NICS), and Yeongnam Agricultural Research Institute (YARI) in 2004. Cheongja 3 was selected from a cross)were carried out from 2000 to 2004. It has a determinate growth habit, purple flower, tawny pubescence, dark brown pod color,black seed coat, green cotyledon, ellipse seed shape, oval leaflet shape and large seed size (32.1 grams per 100 seeds), and it was7 days later in maturity than the check variety Cheongja. In seed quality such a sucrose, and a total sugar contents, isoflavone, andbeen identified to have resistance to necrotic symptom (SMV-N) of soybean mosaic virus which is the troublesome soybean dis-ease. The average yield of Cheongja 3 was 2.40 ton per hectare in the regional yield trials (RYT) carried out for three years from2002 to 2004 which was 12 percent higher than the check variety Cheongja.