뇌하수체 선종내 출혈의 임상분석

이봉훈,김오룡,김성호,배장호,최병연,조수호 대한신경외과학회 1999 Journal of Korean neurosurgical society Vol.28 No.5

공초점 레이저 주사 현미경을 이용한 법랑질 초기 우식 재광화의 정량적 분석

차승우,윤태철,박성호,이찬영,금기연 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.1

Dental Caries which has high prevalence rate, accounts for majority of dental diseases. Many treatment and preventive treatment has been developed, thereby reducing the prevalence rate, but in our country, flouridization has not spread widely yet, so prevention has not been done satisfactorily. When dental caries progresses, irreversible damage of tooth structure occurs. In initial dental caries. Demiteralized tooth structure can be remineralized, so restorative treatment is unnecessary. In the study, 20 teeth restored with composite resin without fluoride release were used and divided into two groups. Incipient dental caries were artificially made and remineralization procedure was done for 1 and 2 weeks, for each group. Changes in mineral contents aroud the margins were analysed with confocal laser scanning microscope. The results were as follow. 1.Both total fluorescence of the lesion and average fluorescence of the lesion of remineralized samples decreased compared to demineralized state. (p<0.01) 2.Confocal laser scanning microscopy can be used in quantitative analysis of mineral change. In result, confocal laser scanning microscopy can be used in quantitative analysis of mineral change and it could be used in many different fields of dentistry in the future. Key words : Confocal laser scanning microscopy. Demineralization. Remineralization, Initial dental caries

자궁경부암종에서 신생혈관 형성과 증식세포 핵항원 및 Ki-67 표지지수의 예후적 의의

박찬필,박문향,이승연 대한병리학회 1997 Journal of Pathology and Translational Medicine Vol.31 No.1

쥐치아재식 모델에서 치주인대의 처리방법에 따른 치주조직의 치유와 치근흡수에 관한 연구

권소란,금기연,이승종 대한치과보존학회 2000 Restorative Dentistry & Endodontics Vol.25 No.3

The effect of bench drying or removal of the periodontal ligament with NaOCl upon periodontal healing and root resorption after readaptation of molars was studied in rats. A total of 40 Sprague-Dawley female rats were used and fed a powdered puling rat chow diet containing 0.4% beta-aminoproprionitrile. The maxillary first molars were extracted and the periodontal ligaments were removed either by bench daring for 15 minutes or by immersion in 2.5% NaOC1 solution. The rats were sacrificed at 5, 10, and 21 days by heart infusion. In order to observe the effect of 0.5% stannous fluoride. 10-4M, 10-2M and 1M etidronate disodium on the early stage of periodontal healing. the periodontal ligament was removed Math 2.5% NaOCl followed by immersion of the molar in the respective solutions for 5 minutes. The rats were sacrificed after 10 days and the following results were obtained. 1.The removal of the periodontal ligament with 2.5% NaOCl seemed to be more effective than bench drying, since the resorption area in the NaOCl treated group showed a gradual increase whereas a decline in resorption area from 5 days to 21 days was observed in the bench dried group. 2.The application of 0.5% stannous fluoride seemed to enhance the periodontal ligament attachment and active migration of fibroblasts could be observed. 3.The application of 10-4M, 10-2M, and IM etidronate disodium led to a good periodontal ligament attachment. No evident areas of root resorption were found. 4.he use of β-APN made it possible to extract the maxillary first molar with all five roots intact.

다시마 분말을 첨가한 막장 에탄올 추출물의 항돌연변이원성 및 세포독성 효과

최승필,조미애,전윤영,이득식,함승시 동아시아식생활학회 2002 동아시아식생활학회지 Vol.12 No.1

This study was carried out to investigate antimutagenic and cytotoxic effects of Korean traditional Mackjang added with sea tangle powder. The content percentage of most of minerals among general composition increased by adding sea tangle powder. By the Ames test, the antimutagenic effect of ethanol extract of Korean traditional Mackjang added with 5% sea tangle powder was strongest, exceeding the control, 10% and 15% sea tangle additions. The ethanol extract (400 ㎍/plate) of Mackjang added with 5% sea tangle powder in the S. typhimurium TA100 strain showed inhibition rate of 95.0% against the mutagencsis induced by MNNG. The inhibition rate of ethanol extract (400 ㎍/plate) of Mackjang added with 5% sea tangle powder in the S. typhimurium TA98 and TA100 strains was 81.4% and 88,8%, respectively, against the mutagencsis induced by 4NQO. Cinder the same conditions, the suppression against B(a)P and Trp-P-1 in the TA98 and TA100 strains were 85.3% and 91.0%, and 96.5% and 92.0%. respectively. For the anticancer effects, an investigation was done on the cytotoxicity of Mackjang added with 5% sea tangle powder on the cell lines with human lung carcinoma (A549), human hepatoeellular carcinoma (HepG2), and human gastric carcinoma (KATOIII). The cytotoxicities were inhibited with increasing the extract concentration. The treatment of 1.0 ㎎/mL Mackjang added with 5% sea tangle powder showed relatively strong cytotoxicity of 61.2%, 61.8% and 66.8% against A549, KATOIII, and HepG2, respectively.

전기자동차 운전을 위한 직류타여자 전동기의 쵸퍼제어

한경희,강승욱,김용주,정연택,이승환 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-

Recently, the speed control of electric motorcar usually adapts the chopper control method by the development of power electronics and semiconductor manufacturing techniques. When the chooper control is adapted to the speed control of electric motorcar. D.C.series motor is mostly used because of the large starting torques and good control characteristics. But with respect to the economy, D.C. separately excited motor with shunt characteristics is profitable because of high adhesivesness and consumption. So, we compare the characteristics of the bilateral variable-ratio chopper controlled D.C. separately exited motor with that of the D.C. series motor theoretically and experimentally, and present the method which is able to simplify the main chopper circuit by selecting among the forward powering, forward regenerative braking, backward powering, and backward regenerative braking only by using the main chopper control signal. Also, control method is studied which has similar driving characteristics to that of the gasoline motorcar.

개에서 심실 조율부위 및 조율주기에 따른 혈역학적 변화

김희열,김재형,노태호,김종진,진승원,유기동,이만영,채장성,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.9

만성 활동성 C형 간염 환자에서 알파 인터페론 2b 투여에 의한 HCV-RNA의 소실

이경태,김연수,문희석,박기오,이엄석,김선문,양현웅,서승원,성재규,나병규,이승민,이병석,김남재,이헌영 충남대학교 의과대학 지역사회의학연구소 2001 충남의대잡지 Vol.28 No.1

Background/Aims : Interferon-alpha is the most effective agent for the treatment of chronic active hepatitis C(CAH-C). The purpose of this study are to evaluate the efficacy of alpha-interferon therapy for the CAH-C and to clarify the correlations between the biochemical and anti-viral responses. Methods : The presence of serum hepatitis C virus(HCV) with increased serum ALT(Alanine aminotransferase) activities were monitored in 18 patients with CAH-C confirmed by serologic studies and liver biopsy from July 1992 to July 1998. The patients were treated with interferon alpha 2b for 6 months and the other eight patients were selected as the control group. Results : The serum ALT levels became within normal limit in 9 of 10 patients(90%) after interferon treatment (End-of-treatment response;ETR). Sustained responses(SR) were achieved in 7 cases(70%) for follow-up period of 18 to 24 months (SR-12month). Two cases were relapsed responders who showed elevated ALT levels within 1-2 months after cessation of interferon therapy and the other case was a non-responders (NR). In all 7 sustained responders (SR), HCV-RNAs were negative at the end of the treatment. But HCV-RNA reappeared in the serum in the case of the relapsed responders during follow-up period after treatment. While none of 8 patients, control group showed normal ALT levels during 18-24 months follow-up period, and the HCV-RNA states did not change in all the control group. Conclusion : This study suggest that the 3 million units of interferon alpha 2b, T.I.W.(three times a week) for 6-month course is effective in the treatment of CAH-C, especially in younger age and shorter duration of disease. The disappearance of serum HCV-RNA is closely associated with the normalization of serum ALT levles, so that the serial measurement of HCV-RNA may be a reliable marker in the efficacy of interferon treatment and predicting relapse.

The Immunohistochemical Expression of STAT3, Bcl-xL, and MMP-2 Proteins in Colon Adenoma and Adenocarcinoma

( Seung Woo Lee ),( Young Yong Ahn ),( Yon Soo Kim ),( Sang Beum Kang ),( Soon Woo Nam ),( Dong Soo Lee ),( Hyun Yong Jeong ),( Jin Man Kim ) 대한소화기기능성질환·운동학회 2012 Gut and Liver Vol.6 No.1

Background/Aims: Signal transducers and activators of transcription (STATs) are a family of transcription factors that are activated in response to cytokines and growth factors. STAT3 activation has been implicated in modulating the activity of downstream mediators, such as Bcl-xL and matrix metalloproteinase-2 (MMP-2). The aim of this study was to investigate the immunohistochemical expression of STAT3, B-cell lymphoma-extra large (Bcl-xL), and MMP-2 proteins according to histopathological parameters in colon adenocarcinomas, including lymph node metastasis, tumor differentiation, the TNM stage and the tumor size. Methods: Immunohistochemical staining with monoclonal STAT3, Bcl-xL, and MMP-2 antibodies was performed on paraffinembedded specimens from 20 colon adenomas and 39 adenocarcinomas. Results: The expression of STAT3, Bcl-xL, and MMP-2 was increased in the adenocarcinomas as compared with the adenomas (p<0.001). STAT3 expression was stronger in tumors with a distant metastasis than in tumors without a distant metastasis (p=0.012). A larger tumor size was related to an increase in STAT3 expression (p=0.035). Conclusions: STAT3, Bcl-xL, and MMP-2 may play important roles in the tumorigenesis of colorectal carcinoma. STAT3 may be indicative of a poor prognosis due to its correlation with distant metastases and a larger tumor size. (Gut Liver 2012;6:45-51)

Avoiding student infection during a Middle East respiratory syndrome (MERS) outbreak: a single medical school experience

Seung Won Park,Hye Won Jang,Yon Ho Choe,Kyung Soo Lee,Yong Chan Ahn,Myung Jin Chung,Kyu-Sung Lee,Kyunghoon Lee,Taehee Han 한국의학교육학회 2016 Korean journal of medical education Vol.28 No.2

Purpose: In outbreaks of infectious disease, medical students are easily overlooked in the management of healthcare personnel protection although they serve in clinical clerkships in hospitals. In the early summer of 2015, Middle East respiratory syndrome (MERS) struck South Korea, and students of Sungkyunkwan University School of Medicine (SKKUSOM) were at risk of contracting the disease. The purpose of this report is to share SKKUSOM’s experience against the MERS outbreak and provide suggestions for medical schools to consider in the face of similar challenges. Methods: Through a process of reflection-on-action, we examined SKKUSOM’s efforts to avoid student infection during the MERS outbreak and derived a few practical guidelines that medical schools can adopt to ensure student safety in outbreaks of infectious disease. Results: The school leadership conducted ongoing risk assessment and developed contingency plans to balance student safety and continuity in medical education. They rearranged the clerkships to another hospital and offered distant lectures and tutorials. Five suggestions are extracted for medical schools to consider in infection outbreaks: instant cessation of clinical clerkships; rational decision making on a school closure; use of information technology; constant communication with hospitals; and open communication with faculty, staff, and students. Conclusion: Medical schools need to take the initiative and actively seek countermeasures against student infection. It is essential that medical schools keep constant communication with their index hospitals and the involved personnel. In order to assure student learning, medical schools may consider offering distant education with online technology.