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제 5 번 경추에 발생한 동맥류성 골낭종- 증 례 보 고 -
최정재,염진영,김선환,고현송,송시헌,김윤 대한신경외과학회 2002 Journal of Korean neurosurgical society Vol.31 No.1
Aneurysmal bone cysts are uncommon bony lesions that usually occur in the metaphyseal region of the long bones in adolescents. Approximately 20% of the aneurysmal bone cysts occur in the spine, pre-dominantly in the lumbar region. These lesions commonly arise from the posterior elements(ex, spinous process, laminae) and occasionally invade the pedicles and the vertebral body. We experienced a case of aneurysmal bone cyst on the entire 5th cervical vertebra(vertebral body, pedicle, laminae, spinous process and transverse process). We perfomed C5 corpectomy and fusion with ORION plate and autologous bone graft on C4-5-6, and C5 total laminectomy with gross total mass removal and posterior fusion with Heid lateral plate system and autologous bone graft and wiring on C4-5-6. The patient showed good recovery. We report a rare case of aneurysmal bone cyst on the whole involved 5th cervical vertebra. Key words:Aneurysmal bone cyst;Cervical spine.
뇌동맥류 파열에 의한 지주막하 출혈 후 수두증 발생의 위험 인자에 대한 임상 연구
최정재,고현송,조준희,김선환,염진영,송시헌,김윤,Choi, Jeong-Jae,Koh, Hyeon-Song,Cho, Jun-Hee,Kim, Seon-Hwan,Youm, Jin-Young,Song, Shi-Hun,Kim, Youn 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.12
Objective : The authors analyzed the incidence, the cause and the prognosis of hydrocephalus following aneurysmal subarachnoid hemorrhage to evaluate the risk factors of hydrocephalus and to provide the proper treatment method for hydrocephalus following aneurysmal subarachnoid hemorrhage. Methods : The 505 cases of subarachnoid hemorrhage followed by aneurysmal surgery from January 1990 to May 1999, were divided into shunt group and shunt-free group and we were reviewed for the clinical status, Fisher's grade, brain CT findings and prognosis. Results : The incidence of acute hydrocephalus was 37.2% of patients and 18.9% to developed chronic hydrocephalus. Shunt surgery due to chronic hydrocephalus was required in 6.5% of patients. We found following variables were significantly related to shunt-dependent hydrocephalus : high Hunt-Hess and Fisher grade, initial CT findings of intraventricular hemorrahge, posterior circulation aneurysm, preoperative rebleeding, delayed ischemic deficits, and initial high ventricular size index. There were no statistically significant relationships between shunt-dependent hydrocephalus and patient age or sex, timing of operation. The previous hypertension was not related to shunt dependent hydrocephalus. Prognosis in shunt group showed poor result. Conclusion : The risk factors of hydrocephalus following aneurysmal subarachnoid hemorrhage are high Hunt-Hess grade, high Fisher's grade, aneurysms of posterior circulations, preoperative aneurysmal rebleeding, delayed ischemic deficits, initial CT findings of intraventricular hemorrahge and initially increased ventricular size. The patients with these factors should the carefully observed and managed accordingly due to poor prognosis related to hydrocephalus requiring shunt operation.
On the Dynamics of Traveling Phase-oscillators with Positive and Negative Couplings
최정재,최무영,윤병국 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.11
We investigate numerically the dynamics of traveling clusters in systems of phase oscillators, someof which possess positive couplings and others negative couplings. The phase distribution, speedof traveling, and average separation between clusters, as well as the order parameters for positiveand negative oscillators, are computed as the ratio of the two coupling constants and the fractionof positive oscillators are varied. The dependence of the traveling speed on these parameters isobtained and is observed to fit well with the numerical data of the systems. With the help of this,we describe the conditions for the traveling state to appear in the systems with and without aperiodic driving field.
Effects of Janus Oscillators in the Kuramoto Model with Positive and Negative Couplings
최정재,최무영,윤병국 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.6
We study the effects of Janus oscillators in a system of phase oscillators in which the coupling constants take both positive and negative values. Janus oscillators may also form a cluster when the other ones are ordered, and we calculate numerically the traveling speed of three clusters emerging in the system and average separations between them, as well as the order parameters for three groups of oscillators, as the coupling constants and the fractions of positive and Janus oscillators are varied. An expression explaining the dependence of the traveling speed on these parameters is obtained and observed to fit well the numerical data. With the help of this, we describe how Janus oscillators affect the traveling of the clusters in the system.
Interaction Effects on the Size Distribution in a Growth Model
최정재,M. Y. Choi,윤병국 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.3
We study, both analytically and numerically, the interaction effects on the skewness of the sizedistribution of elements in a growth model. We incorporate two types of global interaction into thegrowth model, and develop analytic expressions for the first few moments from which the skewnessof the size distribution is calculated. It is found that depending on the sign of coupling, interactionsmay suppress or enhance the size growth, which in turn leads to the decrease or increase of theskewness. The amount of change tends to increase with the coupling strength, rather irrespectivelyof the details of the model.
남미숙,최정재 仁川敎育大學校 初等敎育硏究所 2007 교육논총 Vol.27 No.S
본 연구는 교사의 효과적인 학급경영을 위해 수직적 개념의 장학에서 수평적 개념의 컨설팅으로 장학의 개념을 새롭게 하고자 하는 의도에서 연구되었다. 교사들은 학급 경영을 하는 데 있어서 전문가의 도움의 필요성을 절감하고 있으며 이러한 도움의 기회를 컨설팅 방법으로 접근할 수 있도록 학급경영 컨설팅 프로그램 개발에 목적을 두었다. 학급경영 컨설팅 프로그램을 개발하기 위하여 교사들의 개방형과 선택형 설문지를 통하여 요구 분석을 한 결과, 기본학습태도지도, 생활지도, 독서지도, 상담지도, 진로지도, 교실 환경조성, 그리고 학급경영의 출발점인 3월을 위하여 3월 첫 만남의 7개 영역과 34개의 하위 요소에 대하여 컨설팅을 필요로 하였다. 프로그램의 기본 틀은 서우석의 컨설팅 모형을 따라 준비, 실행, 평가 단계로 구분하였으며 각 단계별로 3-4개의 하위 절차와 내용을 구성하였다. 개발된 학급경영 컨설팅 프로그램을 적용하여 학급경영 컨설팅을 실시하였으며 본고에는 그 중에서 상담 부분의 사례를 중심으로 학급경영 컨설팅의 절차를 제시하였다.