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철근이 부식된 철근콘크리트 슬래브의 구조성능 평가에 대한 실험적 연구
정은철 ( Jung¸ Eun-chul ),이경언 ( Lee¸ Kyoung-un ),정란 ( Chung¸ Lan ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
With the exhaustion of river aggregate which have been used as main resource of aggregate, sea sand have been used. However sea sand without removal of salt cause corrosion of embedded. This study is aimed at providing the data for basic design data of corroded reinforced concrete by testing various corrosion level over 5% specimens.
Loop-Snare Technique을 이용한 혈관내 카테터 이물질의 경피경혈관제거술
정은철 梨花女子大學校 醫科大學 醫科學硏究所 1995 EMJ (Ewha medical journal) Vol.18 No.2
Intravascular embolization of fragments of indwelling intravascular diagnostic polyethylene catheter continues to occur. This causes many complications such as sepsis, thromboembolism, endocarditis and even perforation of cardiac chambers. The author experienced 3 cases of successful retrieval of intravascular iatrogenic catheter foreign bodies which were iocated in right pulmonary artery and inferior vena cava, using loop-snare technique. Percutaneous transluminal retrieval of catheter foreign bodies were underwent within 30minutes. There were no complications following retrieval of foreign bodies. This study suggests that the loop-snare technique is a safe and effective method for retrieval of iatrogenic foreign bodies in the great vessels.
방사선 조사와 마이크로파온열요법이 흰쥐의 간에 미치는 효과에 대한 실험적 연구
정은철 梨花女子大學校 醫科大學 醫科學硏究所 1988 EMJ (Ewha medical journal) Vol.11 No.4
Hyperthermia can enhance the radiation effect as a synergistic effect in combination of X-ray irradiation and hyperthermia. Hyperthermia sensitizes radioresistant S-Phase cells in cell cycle and inhibits cellular recovery from sublethal damage. Author fabricated 100 watt, 2450 ㎒ microwave applicator for hyperthermia, planned the methods and conditions of heating, and measured the temperature by using Agar phantom as a preliminary test. For biological examination, 90 rats were divided into 4 groups as hyperthermia, X-ray irradiation(6, 8 and 10 ㏉), X-ray irradiation with hyperthermia, and normal control groups. Histologic examination of the liver was done. The results were as followings :1) In hyperthermia group, there was mild degeneration of hepatocyte and mild degree of edema in portal tracts. 2) Mild degeneration of hepatocyte was appeared in the liver after 15 days of 6 ㏉ X-ray irradiation, and mild necrosis of hepatocyte with disarray after 60 days of 8 ㏉ irradiation. the findings were more severe in the group of 10 ㏉ irradiation. 3) In the group combined modality of irradiation plus hyperthermia, mild degneration of hepatcoyte was appeared after 15 days of 6 ㏉ irradiation, and mild necrosis of hepatocyte with disarray after 60 days of 8 ㏉ irradition. 4) The thermal enhancement ratio (TER) of the liver, which was calculated at the end point of disarray and necrosis of hepatocyte, was 1.0 in the group of combined modality.
정은철,서정수 梨花女子大學校 醫科大學 醫科學硏究所 1992 EMJ (Ewha medical journal) Vol.15 No.4
Magnetic resonance imaging(MRI) of 47 patients with surgically confirmed lumbar disk herniation at 62 levels was studied retrospectively to evaluate the significance of MRI in diagnosis of lumbar disk herniation. Prolapsed type of lumbar disk herniation is 47 cases(76% ). lumbar disk herniation at L4-L5 level is 33 cases(53 %) and posterolateral herniation is 54 cases(87%). 6 cases(10%) of lumbar disk herniation in MRI were not matched with operative findings, due to lumbar scoliosis(4 cases) and lumbarization of S1 (2 cases). Associated abnormalities are 4 cases of Schmorl's nodule and 2 cases of spondylolisthesis, MRI shows excellent sagittal image and can differentiate extruding type of lumbar disk herniation from prolapsed type. The result of the study indicates the MRI is likely to become the initial procedure of choice for evaluating patients with suspected lumbar disk herniation. If clinically incompatible with MRI findings, it is desirable that CT and/or myelography are complementary to MRI study.
정은철 梨花女子大學校 醫科大學 醫科學硏究所 1992 EMJ (Ewha medical journal) Vol.15 No.3
Hysterosalpingography is a valuable diagnostic tool in the investigation of the uterine and tubal factors of female infertility. Author evaluated the effect of different iodinated contrast agents on the fallopian tube and adnexal tissue in 16 rabbits. Lipiodol, an oil-soluble agent, was used for 4 rabbits. The following water soluble contrast agents were used for 12 rabbits: iothalamate meglumine 60%, diatrizoate sodium, and iopromide. The agents injected through the catheter placed in the fallopian tube. Fallopian tubes and peritoneal cavities were evaluated histologically. Iothalamate meglumine and diatrizoate sodium contrast agents, were associated with mild to moderate Inflammation and edema. Iopromide. which has low osmolarity, produced mild inflammation compared to ionic contrast agents. Use of oil-soluble contrast medium resulted in fibrous adhesion, moderate to marked inflammation and tissue edema in fallopian tubes andperiovarian tissues. The safety of oil-soluble contrast agents for hysterosalpingogrpahy is questioned. Therefore, contrast agents with low osmolarity are suitable for use in hysterosalpingography.
정은철 梨花女子大學校 醫科大學 醫科學硏究所 1993 EMJ (Ewha medical journal) Vol.16 No.3
Magnetic resonance(MR) is the most widely used diagnostic tool for the meniscal tears.160 images of menisci of 30 patients and 10 normal subjects were photographed with coronaland sagittal planes and with narrow and conventional wide window settings. To access thediagnostic efficacy of imaging planes and the window settings, MR images of two windowsettings with coronal and sagittal planes of menisci were interpreted by four experienced observers. Images were graded on a five-point scale to enable receiver operating characteristic (ROC)curve analysis. The ROC curves constructed from the coronal plane were similar to thoseof the sagittal images. The area of under ROC curve constructed from the narrow windowsetting was inferior to one from the wide window settings. There was no difference of diagnosticperformance between four observer to detect meniscal abnormality. This suggests that thereis no globally significant improvement in the detection of meniscal tear when narrow windowsetting are used for interpretation, and there is probable improvement when both coronal andsagittal images are used for meniscal MRI.