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- 저자 : 한병희 (검색결과 118 건)
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한병희 대한영상의학회 1998 대한영상의학회지 Vol.38 No.6
부분 위장관 역위증은 완전 역위증과는 달리 심장과 간, 비장 등 흉, 복부 장기는 모두 정상 위치에 있으면서 위장관의 위치가 좌우로 뒤바뀐 상태를 말하는데, 그 발생빈도는 완전 역위증에 비해 낮다. 저자들은 최근 급성 우상복부 통증 때문에 응급실을 찾아온 9세난 여아의 서서 찍은 복부 X선사진에서 간 부위에 공기액체층이 나타나 간농양ㅇ르 으심했었으나 위장관 바륨검사 결과 그 원인이 위장관 부분 역위증이었던 증레를 경험하였다. 드물기는 하나 급성 복증을 호소하는 환자의 복부 X선사진상 이같이 우상복부에 간농양을 의심하게 하는 공기·액체층이 나타날 경우 반드시 위장관 부분 역위증을 감별진단에 포함하여야 한다고 생각되어 여기에 보고하고자 한다. Partial situs inversus of the gastrointestinal tract is characterized by reversal of the positions of thestomach and intestine, but normal placement of thoracic viscera. Its incidence is lower than that of total situsinversus. We recently encountered a classic case of partial situs inversus which simulated clinically andradiographically a hepatic abscess in a 9-year-old girl. She visited the emergency room complaining ofright-upper-quadrant pain, with tenderness; the onset had been sudden. The posteroanterior chest and uprightabdomen showed an air-fluid level in the right subphrenic area, thus raising the possibility that an abscess waspresent. An upper gastrointesitinal series and barium follow-through study disclosed that the air-fluid level wasdue to the right gastric fun-dus and that the position of the intestines was totally reversed;the small bowel wasin the right abdomen and the ileocecal valve and colon in the left. We report this case because partial situsinversus rarely simulate clinically and radiographically a right subphrenic or hepatic abscess.
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Biphasic반응 조건하에서의 초음파가 Aryl Nitro화합물의 환원반응에 미치는 영향
한병희,백명기 충남대학교 1985 忠南科學硏究誌 Vol.12 No.1
Aryl nitro compounds were reduced to the corresponding amino compounds in high yields using sodium hydrosulfite under sonic irradiation.
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한병희,서정호,김옥화,문창현 아주대학교 1996 아주의학 Vol.1 No.2
Purpose : To evaluate the CT appearances of renal cell carcinoma and correlate them with the nuclear grading and cell type which had been reported as important long term prognosticators. Materials and Methods : Retrospective review of contrast enhanced CT scans was performed in 86 cases of palhologically confirmed renal cell carcinoma. The size, outer margin, and heterogeneity of inner texture of the tumor were evaluated by CT and the distribution of those patterns according to nuclear grade and cell type was compared. The size of the neoplasm was determined by measuring the maximum axial diameter. The shape of the outer margin was classified as sharp or indistinct. The sharply marginated tumors were subclassified as no protrusion, round protrusion, and undulated protrusion. The inner texture was classified as homogeneous solid and heterogeneous containing low density areas. Lesions of the latter type were subclassified as having focal low densities, scattered or confluent low densities, and nearly cystic appearance. Results : The size and outer margin of the tumor were closely correlated with nuclear grade(p<0.01). The tumors less than 5 ㎝ in diameter were of low nuclear grade in 28 of 31 patients. However, the tumors more than 5 ㎝ in diameter were low grade in 28 and high grade in 27 patients. There was a statistically significant difference in distribution of nuclear grading between the two groups (p=0.0002). The lesions which showed no protrusion or round protrusion with sharp margin were low grade in 26 of 28 patients. The lesions which showed undulated or indistinct margin were low grade in 30 and high grade in 28 patients. There was a statistically significant difference in distribution of nuclear grading between the two groups (p=0.0008). The extent of low densities and nuclear grade were not closely correlated(p>0.05). However, the lesions which showed homogeneous solid appearance, focal low densities, or almostly cystic appearances were low grade in 23 of 26 patients while the lesions which showed multiple or confluent low densities were low grade in 33 and high grade in 27 patients. There was a statistically significant difference in distribution of nuclear grading between the two groups(p=0.002). No difference in CT apperances of renal cell carcinoma according to cell type was found. In two patients with sarcomatoid-type lesions, the tumors were more than 5 cm in size with indistinct margin and multiple low densities, and the nuclear grading of lesions was nuclear grade 4. Conclusion : The size and outer margination of renal cell carcinoma correlated most closely with nuclear grading; heterogeneity of inner texture was also correlated. Tumor size of less than 5 cm, no protrusion or round protrusion with sharp margin, homogeneous inner texture with solid appearance, and heterogeneous inner texture with cystic appearance or focal low densities appear to be CT findings that predict low nuclear grading.
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초음파화학, 초음파가 리보스유도체 생성반응에 미치는 영향
한병희,김경만 충남대학교 자연과학연구소 1987 忠南科學硏究誌 Vol.14 No.2
The first ultrasound induced transformations of methyl 2,3-0-iso propylidene-β-D-ribofuranoside, methyl 5-0-acetyl-2,3-0-isopropylidine-β-D-ribofuranoside, methyl, 1,5-di-0-acetyl-2,3-0-isopropylidine-β-D-ribofrnaose, 1,2,3,4-tetra-0-acetyl-β-D-ribofuranose and other derivatives were studied versus those reactions with stirring conditions. We found that ultrasonic irradiation on homogeneous carbohydrate transformation were useful not only stimulation of the reaction rate but also improved yields.
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한병희,김기왕,김재곤,박태석,이수열,조민형,양종수,김정회 대한의용생체공학회 2002 의공학회지 Vol.23 No.4
시변 자계를 이용하여 비접촉적인 방법으로 신경을 자극하기 위해서는 신경자극코일에 대용량 전류 펄스를 순시적으로 인가해야만 한다. 신경자극코일에 인가하는 전류 펄스의 주파수를 증가할수록 신경자극코일에 전력을 공급하는 전력공급기의 용량이 커지게 되고 신경자극코일에 발생하는 열량도 커지는 문제가 발생한다. 본 논문에서는 이러한 문제를 완화하기 위해 새로운 형태의 신경자극코일을 제안하였다. 신경자극코일에 강자성체 구조물을 부착하여 자계 거울 효과를 내게 하면 신경자극코일의 효율이 증가하게 된다. 다양한 형태의 신경자극코일에 대해 자계 거울 효과를 유한요소법으로 분석하였고 몇 종류의 신경자극코일에 대해 실험한 결과를 제시하였다. For non-contact nerve stimulations using time varying magnetic field, high amplitude current pulses have to be applied to a magnetic nerve stimulation coil. To increase the magnetic stimulation frequency we have to increase both power supply capacity and cooling capacity of the magnetic nerve stimulator. To alleviate these problems. we propose a new magnetic nerve stimulation coil design methods. Utilizing magnetic mirror effect of a ferro-magnetic plate attached to a magnetic stimulation coil. we have improved efficiency of the stimulation coil. We have analyzed magnetic mirror effect for various kinds of stimulation coils using the finite element method, and we present experimental results obtained with several kinds of stimulation coils.
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