실험적 뇌탈출에 대한 연구

최운성,주정화,임창수,이훈갑,박상덕 대한신경외과학회 1983 Journal of Korean neurosurgical society Vol.12 No.2

Cerebral herniations were successfully produced in experimental animals during the expansion of intracranial balloon or laminaria. Visualizing structures deep in the brain, cat's heads were instantaneousely frozen with liquid nitrogen and were sectioned in the midline longitudinally. The cerebral herniations were assessed by measuring the distance between parts of various anatomical structures on the brain in mid-sagittal sectional plane. Transtentorial rostrocaudal herniation of the brain stem was evident and more marked in the group of bilateral parietal lesions than in the groups of frontal and temporal lesions. Infratentorial lesions produced transtentorial upward herniation of a part of anterior cerebellar vermis and downward herniation of the cerebellar tonsil through the foramen magnum. The risk of brain herniation was noted to be greater in rapid expanding lesions with balloon than the more slowly developing lesions with laminaria.

A Switched VCO-based CMOS UWB Transmitter for 3-5 GHz Radar and Communication Systems

최운성,박명철,오혁준,어윤성 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.3

A switched VCO-based UWB transmitter for 3-5 GHz is implemented using 0.18 μm CMOS technology. Using RF switch and timing control of DPGs, the uniform RF power and low power consumption are possible regardless of carrier frequency. And gate control of RF switch enables the undesired side lobe rejection sufficiently. The measured pulse width is tunable from 0.5 to 2 ns. The measured energy efficiency per pulse is 4.08% and the power consumption is 0.6 mW at 10 Mbps without the buffer amplifier.

實驗的 腦脫出에 對한 硏究

최운성,이훈갑,주정화 고려대학교 의과대학 1983 고려대 의대 잡지 Vol.20 No.1

Cerebral herniations were successfully produced in experimental animals during the expansion of intracranial balloon laminaria. Visualizing structures deep in the brain, cat's heads were instantaneousely frozen with liquid nitrogen and were sectioned in the midline longitudinally. The cerebral hernations were assessed by measuring the distance between parts various anatomical structures on the brain in mid-sagittal sectional plane. Transtentorial rostrocaudal herniation of the brain stem was evident and more marked in the group of bilateral parietal lesions than in the groups frontal and temporal lesions. Infratentouial lesions produced transtentorial upward herniation of a part of anterior cerebellar vermis and downward herniation of the cerebellar tonsil through the foramen magnum. The risk of brain heniation was noted to be greater in rapid expanding lesions with balloon than the more slowly developing lesions with laminaria.

뇌경막하 농양 1예

최운성,김종현,박경수,채진,최길수,심보성 대한신경외과학회 1975 Journal of Korean neurosurgical society Vol.4 No.1

A 20-year-old male patient was admitted to this hospital because of headache and high fever on October 10, 1974. He has insidiously developed frontal headache and high fever for these 10 days, followed by vomiting, convulsions, aphasia and motor weakness on the left extremities and subsequently fell into semicomatose state. Hemogram showed marked leukocytosis, 22500/㎣, and cerebrospinal fluid cell count revealed increased leukocyte, 1210/㎣. Simple skull Roentgenograms showed no significant abnormalities except for suspicious haziness on the left frontal sinus. Carotid angiogram showed distal shift of the anterior cerebral artery, medial displacement of the middle cerebral artery and small avascular area on the left temporo-parietal area. Brain scan showed high activities on the entier left cerebral hemisphere. On October 12, 1974 a large fronto-tempore-parietal osteoplastic craniotomy was done. Yellowish green, foul-cdored pus gushed out from the subdural space of the entier operating fields. Proteus mirabilis was isolated in pus culture. He was discharged with good recovery two months later.

터어키안 및 그 주위종양의 진단에 대한 고찰

최운성,최길수,심보성 대한신경외과학회 1974 Journal of Korean neurosurgical society Vol.3 No.2

The diagnosis of sellar and parasellar tumors have been thought as relatively easy with detailed clinical history, neurologic findings, hormonal and radiologic studies, because of their characteristic neurologic features and specific endocrine disturbances. But sometimes location, nature, size and shape of the tumors and their relationship to adjacent tissues make it difficult to be determined even with various diagnostic aids. We have experienced 89 cases of sellar and parasellar tumors, excluding aneurysm and inflammatory lesions, during the last 16 years from August, 1958 to July, 1974 at the Department of Neurosurgery, Seoul National University Hospital. Among them we have studied 54 pathologically verified cases for various diagnostic studies. The results were as follows. 1. Detailed clinical history, hormonal studies and neurologic findings were fundamental in the diagnosis. 2. Simple skull x-rays were valuable to differentiate sellar and parasellar tumors and size, shape and calcification of sella turcica were also valuable in differential diagnosis. Double floor shadow of sella turcica on exact simple lateral skull x-ray was very important to locate the tumor. 3. Bilateral carotid angiography and retrograde brachial angiography were important to differentiate the lesion, evaluate the size, extent and nature of sellar and parasellar tumors. The findings of terminal basilar artery were more important. 4. Air studies were valuable to know the extent of tumor and conray ventriculography was much valuable in differential diagnosis especially for obstructive hydrocephalic cases.

파킨슨병 환자 보행에서 눈 높이 위수준의 시각 목표에 대한 두 걸음 구두 암시의 효과

김종만,안덕현,최운성 한국전문물리치료학회 1994 한국전문물리치료학회지 Vol.1 No.1

Memory Effect를 최소화한 C-대역 내부 정합 GaAs 전력증폭기

최운성(Woon-Sung Choi),이경학(Kyung-Hak Lee),어윤성(Yun-Seong Eo) 한국전자파학회 2013 한국전자파학회논문지 Vol.24 No.11

본 논문에서는 C-대역에서 입출력 정합 회로가 패키지에 내장된 10 W급 내부 정합 증폭기 설계 및 제작을 하였다. 전력증폭기 설계에 사용한 트랜지스터로 GaAs pHEMT bare-chip을 사용하였다. 트랜지스터 패드 위치와 커패시터 크기를 고려한 와이어 본딩 해석으로 정확도 높은 설계를 하였다. 패키지와 정합 회로를 함께 EM simulation하여 패키지가 정합 회로에 미치는 영향을 해석하였다. 2-tone 측정 시 memory effect로 인해 발생되는 IMD3의 비대칭성을 줄이기 위한 memory effect 감쇄 바이어스 회로를 제안 및 설계하였다. 측정 결과, 7.1~7.8 ㎓ 대역에서 P1㏈는 39.8~40.4 ㏈m, 전력 이득은 9.7~10.4 ㏈, 효율은 33.4~38.0 %을 얻었고, 제안된 memory effect 감쇄 바이어스 회로로 IMD3(Upper)와 IMD3(Lower)차는 0.76 ㏈ 이하를 얻었다. In this paper, a C-band 10 W power amplifier with internally matched input and output matching circuit is designed and fabricated. The used power transistor for the power amplifier is GaAs pHEMT bare-chip. The wire bonding analysis considering the size of the capacitor and the position of transistor pad improves the accurate design. The matching circuit design with the package effect using EM simulation is performed. To reduce the unsymmetry of IMD3 in 2-tone measurement due to the memory effect, the bias circuit minimizing the memory effect is proposed and employed. The measured P1㏈, power gain, and power added efficiency are 39.8~40.4 ㏈m, 9.7~10.4 ㏈, and 33.4~38.0 %, respectively. Adopting the proposed bias circuit, the difference between the upper and lower IMD3 is less than 0.76 ㏈.

腦實質內血腫의 臨床的 分析

車喜中,崔雲成,高鶴鍾,沈輔星 대한신경외과학회 1975 Journal of Korean neurosurgical society Vol.4 No.2

Seventy cases of intracerebral hematomas were analysed, forty-six of spontaneous origin and remainder of traumatic one, which had been experienced in Seoul National University Hospital between March 1970 and June, 1975. The results were as follows: A. Among forty-six cases of spontaneous intracerebra1 hematomas, twenty-six cases (52%) were primary intracerebral hematomas, normotensive or hypertensive, seven aneurysmal ruptures (15%), seven arteriovenous malformations (15%), two cerebral rete mirabiles, one tumor bleeding, one leukemia, one idiopathic thrombocytopenic purpura and one due to other blood dyscrasia. 1. Among twenty-six cases of primary intracerebral hematomas, angiography was performed in all and fourteen cases were operated. The sites of hemorrhage were as follows: a. Putaminal hemorrhage: 17 cases (65%) (two cases associated with intraventricular hematoma) b. Thalamic hemorrhage: 5 cases (19%) (two cases associated with intraventricular hematoma) c. Subcortical hemorrhage: 4 cases (16%) 2. Overall mortality among twenty-six cases was forty-six per cent; operative mortality was forty-three per cent, and non-operative, fifty per cent. 3. Age, mode of onset, level of consciousness at the time of surgery and the site of hematoma were all important factors for surgical result. Surgical intervention seemed to be most favorable in patients who had verbal communication with subcortical or localized putaminal hematoma. 4. Normotensive group was worse than hypertensive one with conservative treatment, but the former was more benefited than the latter with surgery. 5. Intracerebral hematomas due to aneurysmal rupture, arteriovenous malformation and others were also influenced with above mentioned factors, but the nature of underlined disease was of prime importance. B. Among twenty-four operated cases of traumatic intracerebral hematomas: 1. Five cases(21%) showed classical lucid interval with variable duration from thirty minutes to forty-eight hours. 2. Tempora1 lobe was most frequently involved (63%). 3. Lateral blow was Predominant than axial blow, and contrecoup than coup lesion. 4. Overall mortality was twenty-nine percent. 5. Age, lucid interval, preoperative level of consciousness and associated cerebral contusion or subdural hematoma were important factors for prognosis, but the preoperative level of consciousness was of prime importance.

난치성 발작 및 뇌압상승증에 대한 Sodium Pentothal 지속정맥 점적법이 호흡에 미치는 영향

김종현,최운성,최길수,심보성,김성덕,김용락,김광우,곽일용 대한신경외과학회 1975 Journal of Korean neurosurgical society Vol.4 No.2

It has been postulated recently that Sodium Pentothal has the cerebral protective effect during hypoxia by its efficacy of decreased cerebral oxygen consumption (CMRO₂) by as much as 40 to 50 per cent. It could, potentially, improve regional or total cerebral perfusion in cases of acutely elevated intracranial pressure due to cerebrovasodilation and augmentation of cerebral blood volume, although Sodium Pentothal reduces cerebral blood flow in normal persons. Our study was designed to evaluate the effects of Sodium Pentothal on respiration, which were frequently depressed with 2.5% of Sodium Pentothal as a bolus dose. 0.2% of Sodium Pentothal was administered by continuous intravenous dripping to seven neurosurgical patients showing uncontrollable seizure and increased intracranial pressure. PH, PaCO₂, PaO₂, respiratory rate and minute ventilatory values before and after Sodium Pentothal infusion were evaluated. It was observed that the values of PaO₂ were improved with minimal changes in pH, PaCO₂, respiratory rate and minute ventilatory values.

석회침착을 일으킨 만성 뇌경막하 혈종 1예 보고 : Case report

이현재,최운성,김현집,채진,최길수,심보성 중앙대부설한국의과학연구소 1975 한국의과학 Vol.7 No.3