성인에서 발생한 간아세포종

고지호,이승룡,이은정 고신대학교(의대) 고신대학교 의과대학 학술지 2005 고신대학교 의과대학 학술지 Vol.20 No.1

Hepatoblastoma is the most frequent primary malignant liver in children under the age of 2 years, but a few case have also been reported in adults. We present herein a rare case of hepatoblastoma in a 62 year male patient.He had been suffering from a pain and a palpable lump in the left upper abdominal area. His serum alpha-fetoprotein (AFP) was elevated to 77.89 ng/mL. Abdominal computed tomography demonstrated a large, inhomogeneous low -density mass (14x11x10cm) occupying the left hepatic lobe, with some lower-density areas that showed hemorrhage and necrosis. With a suspicion of hepatocellular carcinoma of the left lobe, a left lateral segmentectomy was performed. The external surface showed a huge protruding mass and the capsule was previously ruptures. The tumor had a variegated surface composed of yellow-white friable tissue with multifocal hemorrhage. Microscopic examination revealed a mixed hepatoblastoma consisted of epithelial and mesenchymal elements.

성인에서 발생한 간아세포종

고지호,이승룡,이은정 고신대학교 의학부 2005 高神大學校 醫學部 論文集 Vol.20 No.1

Hepatoblastoma is the most frequent primary malignant liver in children under the age of 2 years, but a few case have also been reported in adults. We present herein a rare case of hepatoblastoma in a 62 year male patient. He had been suffering from a pain and a palpable lump in the left upper abdominal area. His serum alpha-fetoprotein(AFP) was elevated to 77.89 ng/mL. Abdominal computed tomography demostrated a large, inhomogeneous low-density mass(14×11×10cm) occupying the left hepatic lobe, with some lower-density areas that showed hemorrhage and necrosis. With a suspicion of hepatocellular carcinoma of the left lobe, a left lateral segmentectomy was performed. The external surface showed a huge protruding mass and the capsule was previously reptures. The tumor had a variegated surface compsoed of yellow-white friable tissue with multifocal hemorrhage. Microscopic examination revealaed a mixed hepatoblastoma consisted of epithelial and mesenchymal elements.

PWM 전력 컨버터를 이용한 배전용 무효전력 보상기 제어

고지호,김용현,김재홍,김일환 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.1

This paper presents the control method of reactive power in distribution system using PWM power converter. The PWM power converter controlled by space vector PWM method is voltage source type using IGBT switching device. Using the Park's transformation, three phase load current can be written in terms of component α and β current in a synchronously rotating reference frame. Two axis. the direct axis. α. and the quadrature axis. β, mean the active and reactive component in load current. Also. two components appear as de quantities in that frame. So it is easy to control the reactive power by controlling the d axis currents. And in accordance with the change of reactive power in load side. PWM power converter compensate the reactive power by generating the reactive current to the load side using PI control. To verify the theoretical analysis. results of computer simulation and experiment are presented to support the discussion

PWM 전력 컨버터를 이용한 배전용 무효전력 보상기 제어

고지호,김용현,김재홍,김일환 제주대학교 산업기술연구소 2000 尖端技術硏究所論文集 Vol.11 No.1

This paper presents the control method of reactive power in distribution system using PWM power converter. The PWM power converter controlled by space vector PWM method is voltage source type using IGBT switching device. Using the Park's transformation, three phase load current can be written in terms of component α and β current in a synchronously rotating reference frame. Two axis, the direct axis, α, and the quadrature axis, β, mean the active and reactive component in load current. Also, two components appear as dc quantities in that frame. So it is easy to control the reactive power by controlling the d axis currents. And in accordance with the change of reactive power in load side, PWM power converter compensate the reactive power by generating the reactive current to the load side using PI control. To verify the theoretical analysis, results of computer simulation and experiment are presented to support the discussion

생체 외에서 시행한 정량적 자기공명영상, 단일 에너지 정량적 전산화단층촬영술, 그리고 이중엑스선 골밀도측정기 사이의 연관성

고지호,허진도,정규식,오경승,이승룡,조영덕 고신대학교(의대) 고신대학교 의과대학 학술지 2004 고신대학교 의과대학 학술지 Vol.19 No.1

This study was performed to examine the correlation among quantitative magnetic resonance (QMR), single energy quantitative computed tomography (SE-QCT), and dual energy X-ray absorptiometry (DXA), and to examine the relation with bone mineral density (BMD) through in vitro experiment with pig lumbar vertebrae. The correlation among 1/T2 of QMR, SE-QCT, and DXA was investigated by measuring the pig lumbar vertebrae BMD five times each method. It was examined whether there is a significant difference in the values of 1/T2, SE-QCT, and DXA measured by changing the height (11cm, 20cm, 29cm) of water in water bath in order to make the soft tissues different in quantity. The lumbar vertebrae were placed in 0.1N sodium hydroxide (NaOH) solution for 24 hours to remove the residual soft tissue. Each values of SE-QCT before and after removal of the soft tissue were compared. Real BMD, measured after burning only the body of lumbar vertebrae for 3 hours at 1200℃, was compared to BMD with three methods. Based on the correlation analysis of 1/T2 and SE-QCT (correlation coefficient, r=-0.729 to 0.737), 1/T2 and DXA (r=-0.709 to 0.929), and SE-QCT and DXA (r=-0.878 to 0.862) after measuring BMD within the water bath, no significant correlation was observed among three methods. Also, there was no correlation between 1/T2 and SE-QCT (r=-0.587 to 0.447) measured in the outside of water bath. SE-QCT (P=0.094) and 1/T2 (P=0.012 to 0.094) measured in the inside and the outside, respectively, of the water bath were significantly different. When the height of water in the water bath was different, the change value of the BMD showed a significant difference in 1/T2 (P=0.012 to 0.403) and SE-QCT (P=0.012 to 0.527), but not in DXA (P=0.012). The values of SE-QCT measured before and after placing lumbar vertebrae in 0.1N NaHOH for 24 hours were not significantly different (P=0.3177). The BMD and 1/T2 measured after burning showed the similar changing aspect (P=0.028 to 0.106), however SE-QCT and DXA showed the different changing aspect (P<0.05). There was no correlation among QMR, SE-QCT, and DXA, however the significant relation was observed between the BMD and QMR. The value of the BMD was measured differently depending on the height of water in the water bath. Therefore, although QMR is influenced by the height of the water bath in some degree, it reflects the BMD very well.

생체 외에서 시행한 정량적 자기공명영상, 단일 에너지 정량적 전산화단층촬영술, 그리고 이중엑스선 골밀도측정기 사이의 연관성

고지호,허진도,정규식,오경승,이승룡,조영덕 고신대학교 의학부 2004 高神大學校 醫學部 論文集 Vol.19 No.1

This study was performed to examine the correlation among quantitative magnetic resonance (QMR), single energy quantitative computed tomography (SE-QCT). and dual energy X-ray absorptiometry (DXA), and to examine the relation with bone mineral density (BMD) through in vitro experiment with pig lumbar vertebrae. The correlation among 1/T2 of QMR, SE-QCT, and DXA was investigated by measuring the pig lumbar vertebrae BMD five times each method. It was examined whether there is a significant difference in the values of 1/T2, SE-QCT, and DXA measured by changing the height (11㎝, 20㎝, 29㎝) of water in water bath in order to make the soft tissues different in quantity. The lumbar vertebrae were placed in 0.1N sodium hydroxide (NaOH) solution for 24 hours to remove the residual soft tissue. Each values of SE-QCT before and after removal of the soft tissue were compared. Real BMD, measured after burning only the body of lumbar vertebrae for e hours at 1200℃, was compared to BMD with three methods. Based on the correlation analysis of 1/T2 and SE-QCT (correlation coefficient, r= -0.729 to 0.737), 1/T2 and DXA (r= -0.709 to o.929) and SE-QCT and DXA (r= -0.878 to 0.862) after measuring BMD within the water bath, no significant correlation was observed among three methods. Also, there was no correlation between 1/T2 and SE-QCT (r= -0.587 to 0.447) xeasured in the outside of water bath. SE-QCT (p=0.094) and 1/T2 (P=0.012 to 0.094) measured in the inside and the outside, respectively, of the water bath significantly different. When the height of water in the water bath was different, the change value of the BMD showed a significant different in 1/T2 (p=0.012 to 0.403) and SE-QCT (p=0.012 to 0.527), but not in DXA (P=0.012). The values of SE-QCT measured before and after placing limbar vertebrae in 0.1N NaOH for 24 hours were not significantly different (P=0.3177). The BMD showed the different changing aspect (p<0.05). There was no correlation among QMR, SE-QCT, and DXA, however the significant relation was observed between the BMD and QMR. The value of the BMD was measured differently depending on the height of water in the water bath. Therefore, although QMR is influenced by the height of the water bath in some degree, it reflects the BMD very well.

후복막강으로 파급된 침윤성 황색육아종성 신우신염 : 증례보고

고지호 고신대학교의과대학 2006 고신대학교 의과대학 학술지 Vol.21 No.2

Xanthogranulomatous pyelonephritis is an uncommon form of granulomaous inflammation characterized by destruction of the renal parenchyma and replacement by solid sheets of lipid-laden macrophages. The process is typically unilateral and maybe focal, segmental or diffuse. The classic radiographic appearance of xanthogranulomatous pyelonephritis is an enlarged nonfunctioning kidney associated with an obstructing calculus at the ureteropelvic junction. We report a case of infiltrative xanthogranulomatous pyelonephritis with extension to the retroperitoneal space.

이중엑스선 골밀도 측정기를 이용한 폐경 여성에서 호르몬 대치 요법 후의 골밀도 영향

고지호,정미희 고신대학교의과대학 2006 고신대학교 의과대학 학술지 Vol.21 No.2

Pulpose : To assess the change pattern and useful site of bone mineral density after hormone replacement therapy in postmenopause using dual energy X-ray absorptiometry. Materials and Methods : We evaluated 40 patients(22: postmenopause and 18: surgical menopause) who between June, 1999 and December 2002 underwent dual energy X-ray absorptiometry after hormone replacement therapy, except endocrine disease and drug abuse. Their ages ranged from 40 to 66(mean, 49.6) years and mean duration of hormone replacement therapy were 14.9(from 4 to 41) months. We investigated the bone mineral density effect and useful site(lumbar vertebrae, femoral neck, Ward's triangle, trochanter, femoral shaft), intraobserver variation, and interobserver variation, respectively. Results : The bone mineral density effect of lumbar vertebrae before and after hormone replacement therapy was significant correlation from 1.0658 g/cm2 to 1.1065 g/cm2(p<0.05). Other bone mineral density effects before and after hormone replacement therapy, femoral neck in 0.8717 and 0.8765, Ward's triangle in 0,6698 and 0.6798, trochanter in 0.6976 and 0.7218, shaft in 1.1305 and 1.1611, were not significant correlation. The intraobserver variations(lumbar vertebrae: 0.2% femoral neck: 1.7% ; Ward's triangle: 0.7% ; trochanter: 0.7% ; femoral shaft: 3.1%) and interobserver variations(lumbar vertebrae: 0.3% ; femoral neck: 1.9% ; Ward's triangle: 0.8% ; trochanter: 0.9% ; shaft: 3.0%) were measured. Conclusion : The bone mineral density of lumbar vertebrae using dual energy X-ray absorptiometry may be useful for the follow-up examination after hormone replacement therapy in postmenopause.

이단가스화기를 이용한 목재의 공기가스화에서 feedstock property에 따른 producer gas 조성변화

고지호,최영곤,최경구,오승진,김주식 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

본 연구는 이단 가스화기를 이용한 목재 가스화에서 feedstock인 목재의 feed rate를 변화시켜 생성되는 producer gas의 조성변화를 살펴본 연구이다. 장시간의 가스화 실험에 적합한 가스화 조건을 찾기위해 선행된 연구로 유동화매체로는 air를 사용하였고 tar cracking을 위해 상부반응기에 활성탄을 사용하였다. 후단에는 cyclone, hot-filter, condenser 등을 사용하였다.

상허사상을 통한 교육개혁 추구

고지호,박소진 건국대학교 1999 常虛思想 Vol.10 No.-