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유덕연,조중열,김형주,김준영 한국반도체디스플레이기술학회 2014 반도체디스플레이기술학회지 Vol.13 No.1
ZnO is a wide bandgap (3.3 eV) semiconductor with high mobility and good optical transparency. However, off-current characteristics of ZnO thin-film transistor (TFT) need improvements. In this work we studied the variation in ZnO TFT current under different annealing conditions. Annealing usually modifies gas adsorption at grain boundaries of ZnO. When oxygen is adsorbed, electron density decreases due to strong electronegativity of the oxygen, and TFT current decreases as a result. Our experiments showed that current increased after vacuum annealing and decreased after air annealing. We explain that the change of off-current is caused by the desorption and adsorption of oxygen at the grain boundaries.
이아름,유덕균,이용희,전수민,정수한,노진성,주소연,황시원,김홍희,권성훈,정준호,YoungnimChoi 대한면역학회 2021 Immune Network Vol.21 No.5
Sjögren's syndrome (SS) is an autoimmune disease characterized by dryness of the mouth and eyes. The glandular dysfunction in SS involves not only T cell-mediated destruction of the glands but also autoantibodies against the type 3 muscarinic acetylcholine receptor or aquaporin 5 (AQP5) that interfere with the secretion process. Studies on the breakage of tolerance and induction of autoantibodies to these autoantigens could benefit SS patients. To break tolerance, we utilized a PmE-L peptide derived from the AQP5-homologous aquaporin of Prevotella melaninogenica (PmAqp) that contained both a B cell “E” epitope and a T cell epitope. Repeated subcutaneous immunization of C57BL/6 mice with the PmE-L peptide efficiently induced the production of Abs against the “E” epitope of mouse/human AQP5 (AQP5E), and we aimed to characterize the antigen specificity, the sequences of AQP5E-specific B cell receptors, and salivary gland phenotypes of these mice. Sera containing anti-AQP5E IgG not only stained mouse Aqp5 expressed in the submandibular glands but also detected PmApq and PmE-L by immunoblotting, suggesting molecular mimicry. Characterization of the AQP5E-specific autoantibodies selected from the screening of phage display Ab libraries and mapping of the B cell receptor repertoires revealed that the AQP5E-specific B cells acquired the ability to bind to the Ag through cumulative somatic hypermutation. Importantly, animals with anti-AQP5E Abs had decreased salivary flow rates without immune cell infiltration into the salivary glands. This model will be useful for investigating the role of anti-AQP5 autoantibodies in glandular dysfunction in SS and testing new therapeutics targeting autoantibody production.
조미연,손진희,김준미,김경미,박영수,김우호,정진숙,정은선,진소영,강대영,박재복,박호성,최유덕,성순희,김영배,김호근,배영경,강미선,장희진,채양석,이희은,박도윤,이연수,강윤경,장희경,홍순원,최영희,신옥란,구미진,김윤화,김광일,장세진,김희경 대한의학회 2010 Journal of Korean medical science Vol.25 No.6
Despite remarkable progress in understanding and treating gastrointestinal stromal tumors (GISTs) during the past two decades, the pathological characteristics of GISTs have not been made clear yet. Furthermore, concrete diagnostic criteria of malignant GISTs are still uncertain. We collected pathology reports of 1,227 GISTs from 38 hospitals in Korea between 2003 and 2004 and evaluated the efficacy of the NIH and AFIP classification schemes as well as the prognostic factors among pathologic findings. The incidence of GISTs in Korea is about 1.6 to 2.2 patients per 100,000. Extra-gastrointestinal GISTs (10.1%) are more common in Korea than in Western countries. In univariate analysis, gender, age, tumor location, size, mitosis, tumor necrosis, vascular and mucosal invasions, histologic type, CD34 and s-100 protein expression, and classifications by the NIH and AFIP criteria were found to be significantly correlated with patient’s survival. However, the primary tumor location, stage and classification of the AFIP criteria were prognostically significant in predicting patient’s survival in multivariate analysis. The GIST classification based on original tumor location, size, and mitosis is more efficient than the NIH criteria in predicting patient’s survival, but the mechanism still needs to be clarified through future studies.
노경연(KY Roh),김광준(KJ Kim),김유찬(YC Kim),김재남(JN Kim),손문옥(MO Son),남상익(SI Nam),최유덕(YD Choi) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.9
The acardiac anormaly is a rare complication of monozygotic twin pregnancies. It is associated with twin reversed arterial perfusion (TRAP) sequence. We experienced a case of acardiac twin prenataly diagnosed by ultrasonography, so we present this case with a brief review of the literature.
자궁외 임신에 대한 Methotrexate 치료가 차후 임신에 미치는 영향
김재남(JN Kim),오상근(SK Oh),노경연(KY Roh),김유찬(YC Kim),김광준(KJ Kim),이종민(CM Lee),최승헌(SH Choi),최유덕(YD Choi) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.9
Methotrexate is known as one of the most useful drugs in the treatment of unruptured ectopic pregnancy, But little is known on the effect of the later fecundability. So, we had clinical observation on the reproductive outcome of the 97 ectopic pregnancies after MTX treatmrnt at Gill Medical Center Hospital from the period of July 1993 to January 1997, retrospectively. The results were as follows : 1. Overall pregnancy rate was 87.6% with 85 pregnancies among 97patients, spontaneous abortion rate was 9.4%, ectopic pregnancy rate was 3.5%. 2. Overall fallopian tubal patency rate was 90.8% with 173 tubes of 97 patients. 154 tubes in 76 cases of bilateral tubal group patency rate was 92.1%. 21 tubes in 21 cases of unilateral tubal group patency rate was 81.0%. 3. In 61 patients of HSG group, 55 pregnancies was noticed with 90.2% of pregnancy rate. 4. In 24 patients of nonHSG group, 19 pregnancies was noticed with 79.2% of pregnancy rate. 5. In 68 patients of bilateral tubal group, 60 pregnancies were revealed with 88.2% pregnancy rate. 6. In 17 patients of unilateral tubal group, 14 preganacies were revealed with 82.3% pregnancy rate.
자궁외임신에 있어서 자궁내막의 조직내분비 소견에 관한 연구
김유찬(YC Kim),김재남(JN Kim),노경연(KY Roh),오상근(SK Oh),이지성(JS Lee),최승헌(SH Choi),최유덕(YD Choi) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.10
Objective: Our purpose was early detection of ectopic pregnancy using endometrial pattern changes and serum β-hCG. Methods: We had observed in 158 patients of ectopic pregnancy at the Department of Obstetrics and Gynecology, Gachon Medical college, Gil Medical Center hospital from July 1, 1993 to January 31, 1995. The patients were evaluated by the distribution of age, number of induced abortion, gestational periods, serum β-hCG, and patterns of endometrium. Results: The mean age distribution was 28.4 years old (±SD 4.83). The distributionon of the mean number of induced abortion was 1.3. The patterns of endometrium were consisted of secretory phase 39.9%, decidual reaction 24.7%, proliferative phase 16.5%, Arias-Stella reaction 13.9%, and mixed phase 5.0%. The endometrial patterns excluding decidual reaction and Arias-Stella reaction were 61.3% of which were proliferative phase, secretory phase, and mixed phase. Decidual reaction and Arias-Stella reaction were more prevalent in 5∼7 gestational age weeks, but after 8weeks they were sharply declined. And the trend of decidual change as well as Arias-Stella reaction were correlative in 5∼7 gestational age weeks. Decidual reaction and Arias-Stella reaction were more prevalent in group of β-hCG 100∼10, 000 mIU/ml. But There was no statistical significance due to wide range of deviation (unpaired student`s t-test: p>0.05). Conclusion: Additional endocrine tests, ultrasonography and diagnostic endoscopy are mandatory for early detection of ectopic pregnancy in association with endometrial biopsy because neither the decidual reatction or Arias-Stella reaction nor the proliferative phase, secretory phase, or mixed phase are not tentitive finding of the ectopic pregnancy.