실리카흄을 흔입한 고강도 콘크리트 개발

홍창우,김태경,김경진,김성환,김남윤,심도식,이정호,윤청호,백민경,원치문,박제선,이주형,정경일 강원대학교 석재복합신소재제품연구센터 1996 석재연 논문집 Vol.1 No.-

콘크리트 구조물이 대형화됨에 따라 설계단면이 증대되어 상대적으로 많은 경제적 손실을 부담하게 된다. 따라서 단면을 감소시키면서도 소요의 하중에 안전한 구조물을 건설하기 위해서는 우선적으로 구조물 건설에 기초가 되는 고품질, 고내구성의 고강도 콘크리트 개발이 절실히 요구된다 본 연구에서는 일정 시멘트비 및 혼화재 비율하에서 소요의 워커빌리티가 확보되는 고강도 콘크리트를 시간과 온도의 변화에 따라 증기 양생하여, 압축, 인장, 휨강도 뿐만 아니라 파괴특성을 실험적으로 연구하였다. 시료 제작시 시멘트 입자 사이의 공극 및 불연속 영역을 충전하여 고밀도화하기 위한 콘크리트용 혼화재로 시멘트 비표면적이 상당히 작은 초미립 분말인 실리카흄을 이용하였다. 또한 AE감수제 및 고성능 유동화제를 사용하여 혼화재의 첨가에 의하여 발생될 수 있는 워커빌리티의 감소를 방지하였다. 실험결과에 의하면 일정 양생 지속 시간하에서 온도의 증가에 따라 콘크리트의 압축, 인장 및 휨강도가 전반적으로 증가하였다. 동일하게 일정 온도하에서 양생 지속시간이 커짐에 따라 강도들이 증가됨을 알 수 있었다. 따라서 상대적으로 높은 온도와 긴 지속 양생 조건하에서 파괴에 대한 저항력이 크게 나타났다. The compressible, tensible, and flexibleresistance of the high strength concrete is analyzed by the experimentation in the present study. For the test, we cure several samples with the silica fume as a mixture being become dense the spaces between the particle of cement under the variation of both the temperature and the curing-interval. Then, the superplasticizer and the ezcon are also used to satisfy the required workability for construction. The compressible, tensible, and flexible resistances to a stress are increased as increasing the temperature and the time interval for the curing. Therefore it is concluded that the overal fractural and mechanical properties is improved by mixing the silica fume into the cement.

만성 호중구성 백혈병 1례

기장도,박치영,류보열,김태종,모성환,곽재정,문철호,박근홍,박유환,정춘해 朝鮮大學校 附設 醫學硏究所 1996 The Medical Journal of Chosun University Vol.21 No.1

Chronic neutrophilic leukemia is a very rare myeloproliferative disorder which is characterized by severe sustained mature neutrophilic leukocytosis in peripheral blood (PB), hepatosplenomegaly, elevated leukocyte alkaline phosphatase, serum uric acid. serun viatmin B 12 and the bleeding tendency despite normal platelet count and coagulation time, absence of philadelphia chromosome, and the absence of fever or underlying infection or disease sufficient to mimic a leukemoid reaction. We have experienced a 34-years-old male patient with atypical chronic neutrophilic leukemia. On admission, the leukocyte count was 56,860/uL. severe neutrophic leukocytosis with 76% neutrophils and rare immature forms on PB smear. Many neutrophils had toxic granules, and vacuoloes. Leukocyte alkaline phosphatase score was decreased. The cytogenetic study showed Philadelphia chromosome negative with normal karyotype.

요추부 유합수술 후 가동인접분절의 후기변화

김홍태,강도원,유찬훈,정재호,장세앙 대한척추외과학회 1996 대한척추외과학회지 Vol.3 No.1

The spinal fusion in a lumbar region may influence biomechanically in the remained mobile segment to take over the lost motions Therefore the stress concentration on the adjacent segments may accelerate the degenerative changes, and then various late changes could occur. The aim of this study was to evaluate the late changes occuring in the adjacent segments to lumbar fusions. A retrospective review of radiographs and medical records was undertaken for 67 consecutive patients who had undergone various fusions in the lumbar region for various pathologic conditions. Included in this study were the patients who had performed active daily livings without any significant pain or disability after fusion and followed for a minimum of five years(up to 18 years with a mean of 8.3 years). The results of this study were as follows : The instability, disc narrowing, spinal stenosis, vertebral slipping, or isthmic defect were found in the adjacent segments to fusions in the patients who were followed longer, in L4-5 segment and above segment of fusion, and in the adjacent segments where a degenerative changes existed before surgery and where the angular motion increased considerably in a few years after fusion. The symptoms of these patients were responded well with conservative theraphy and no patient needed any surgical theraphy during these follow-up periods.

보존적 치료로 호전된 요로감염에 의한 자발성 신파열

홍소현,김도연,김태오,배지윤,이신아 이화여자대학교 의과학연구소 2014 EMJ (Ewha medical journal) Vol.37 No.S

자발성 신파열은 외상 혹은 수술 등의 병력 없이 신장 피막 혹은 신장 주위 혈종이 자발적으로 발생하는 드문 질환으로, 원인으로는 요로 결석[1], 결핵, 신우신염, 신농양 같은 감염성 질환이나[2] 신장의 종양 및 신장 이식 수술 후[3], 후천성 낭성 신환[4] 등이 관련이 있다. 그 중 복막 투석 환자에서 낭성 신질환에 의한 자발성 신파열은 국내 보고가 있었으나 요로감염에 의한 자발성 피막하 혈종을 동반한 신파열은 문헌 보고가 없었다. 저자들은 요로감염으로 진단된 환자에서 피막하 혈종을 동반한 신파열 1례를 경험하였기에 문헌 고찰과 함께 보고하는 바이다.

피부단순포진 진단을 위한 Tzanck 도말, 바이러스배양 및 면역형광검사의 비교 연구

黃道憲,金永泰,金在烘 한양대학교 의과대학 1991 한양의대 학술지 Vol.11 No.1

Although Herpes Simplex Virus (HSV) infection is one of the most common infectious diseases, its two main laboratory diagnostic methods-Tzanck smear is a simple, inexpensive and rapid method, but it shows relatively low positivity. Similarly, the viralculture is the most accurate and definitive method, but it is expensive and relatively time-consuming test. There is a demand for more practical laboratory diagnostic methods for cutaneous herpes simplex infections. The purpose of this study is to examine the effectiveness of the indirect immunofluorescence (IIF) staining with monoclonal antibodies, which is suggested as a practical method. For the study, 103 patients suspected HSV infection were sampled at the Department of Dermatology in Hanyang University Hospital from March 1987 to July 1990. In the 60 specimens for Tzanck smear and viral culture, Tzanck smear was 35(58.3%) positivities, and viral culture was 56(93.3%) positivities(p〈0.05). In the 43 specimens for viral culture and IIF staining, viral culture was 40(93%) positivities and IIF staining was 37(86%) positivities(p〉0.05). In the 25 specimens, which viral culture was positivities, IIF staining showed 22(88%) positivities and Tzanck smear was 16(64%) positivities(p〈0.05). In summary, the result of Tzanck smear showed relatively high correlation to the results of IIF staining and viral culture. However, the result of IIF staining showed a significant agreement with the result of viral culture. It is suggested that the IIF staining with monoclonal antibodies is a simple, inexpensive, but accurate and relatively rapid method for the diagnosis of cutaneous HSV infections.

알루미늄 롱넥 플랜지의 냉간 성형해석

허관도,여홍태 동의대학교 산업기술개발연구소 2001 産業技術硏究誌 Vol.15 No.-

This study is concerned with the analysis of deformation to make an aluminum long-neck flange by cold extrusion and upsetting processes. The process of deformation was analysed using DEFORM(a commercial rigid-plastic FEM code) to get informations such as distributions of effective strain, metal flow and the relationship between load and punch stroke on the variation of semi-extrusion angle. The diameter ratios of a prestressed die with one stress ring have been also considered to determine the dimension of each ring. In the results, it is found that the initial extrusion load as well as the final load increases according to the increase of semi-extrusion angle. Especially, at the final extrusion stage, the increase of semi-extrusion angle makes high the effective strain near the outer surface of workpiece along the longitudinal direction, but punch stroke is decreased. In flange forming by upsetting process, the variation of semi-extrusion angle does not affect much forming load, but the increase of semi-extrusion angle reduces the region of high deformation and punch stroke. It is also found that the maximum separated distance from mandrel to workpiece is linearly decreased by increasing semi-extrusion angle. Therefore, it is possible to control the parameters such as forming load, punch stroke, and effective strain, which have effect on the manufacturing process and product quality, by changing semi-extrusion angle.

강인한 퍼지 디지털 PI+D 제어 시스템의 설계 및 구현

권태익,이재홍,김승철,설재훈,임영도 동아대학교 정보기술연구소 2001 情報通信硏究所論文誌 Vol.9 No.1

In this paper, Fuzzy Digital PI+D Controller plans for load, noise, plant change, Fuzzy Controller makes use of simple four rule and membership function, and plant used three phase Induction Motor. Characteristic of system compared from experimentation respectively the proposed Control System, Digital PID Control and Digital PI+D Control System.

口腔 및 이下部에 생기는 囊腫에 對한 臨床的 考察

鞠兌津,崔哄碩,河政道,李東薰 全南大醫大 1984 전남의대학술지 Vol.21 No.3

정신과 외래환자의 약물치료 반응과 심박동 변이의 변화 양상

이상규,이홍석,김인주,김형태,김도훈,손봉기 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.6

Objectives : The purpose of this study was to investigate the change of heart rate variability after antidepressant treatment in depressed or anxious patients. We tried to find the usefulness of heart rate variability as a predictive marker of response to pharmacological treatments in the psychiatric field. Methods : Forty-seven patients with major depression, anxiety disorder, and somatoform disorder were treated over 4 weeks with antidepressants and were then classified as responders or nonresponders according to Hamilton depression scales or CGI scores. The HRV variables were measured and compared among the responders/nonresponders and the matched normal control. Results : The responders group exhibited low heart rate, low PSI, high SDNN, RMSSD, HRV index, NN50, pNN50, LNTP, LNLF, and LNHF compared with the nonresponders after 4 weeks antidepressant treatment. However, no significant differencein HRV vanables was observed between the responders group after treatment and the nonnal control group and the responsegroup after treatment. Conclusion : These results indicate that HRV variables would are normalized after successful antidepressant treatment and it that HRV has some possible uses as a predicting marker of antidepressant response.

CMAS公法에 있어서 固定 및 回轉媒體를 利用한 染色廢水의 處理에 關한 硏究

閔庚碩,金弘泰,都仲鎬 경북대학교 산업기술연구소 1990 産業技術硏究誌 Vol.18 No.-

The purpose of the research is determination of the substrate removal efficiencies and sludge productions in complex dyeing wastewater treatment using the Fixed/Submerged Moving Media Complete Mixing Activated sludge(CMAS) process. Laboratory scale CMAS reactors were operated with the organic loading rates from 0.38 to 1.07㎏BOD/㎥/day. The sludge productions were similar in both the fixed and submerged moving media systems. During operating periods the sludge was removed periodically in fixed media system, yet not removed in submerged moving media.