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경추 척수병증 환자에 있어서 Phase-Contrast Cine MRI 평가의 임상적 유용성
임정환,송준혁,신규만,김성학,Lim, Jeong-Hwan,Song, Jun-Hyeok,Shin, Kyu-Man,Kim, Sung-Hak 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.12
Objective : The cerebrospinal fluid(CSF) pulsates within the craniospinal axis in response to rhythmic cerebral blood volume variation during the cardiac cycle. The aim of this study is to characterize the normal and abnormal CSF flow and its waveforms in the cervical spinal subarachnoid space. Methods : The magnetic resonance(MR) images were obtained with 1.5 T(GE Signa, GE Medical Systems, Milwaukee, USA) unit using the 2 dimensional cine PC(phase contrast) sequence with cardiac gating and gradient recalled echo imaging. This pulse sequence yielded 16 quantitative flow-encoded images per cardiac cycle. Sagittal and axial images of the cervical spinal CSF space were obtained, and target sites were analyzed for characteristic CSF flow (TR=50ms, TE=12.5-15ms). The region of interest(ROI) was 1mm 3 in volume. Twenty six persons were included in this study : 10 healthy volunteers and 16 patients with cervical myelopathy. The post-operative cine MR study were also done in five patients. Results : The normal CSF pulsation dynamics in the cervical spine showed discrete systolic and diastolic components. The CSF flow revealed a sine wave pattern, in which the systolic phase was shorter than the diastolic phase(ratio=2 : 3). The patient group revealed decreased amplitudes of the CSF flow and irregularly distored flow waves. The systolic phase was elongated in the ROI above the stenotic level, whereas the diastolic phase was lengthened below the level. In the postoperative images, the abnormal pattern and amplitude were found to be corrected. Conclusion : From these results, the authors believe that the CSF flow study provides valuable informations regarding the extent of cervical stenosis and may be useful for the surgical planning and post-operative evaluation.
결절성 경화증에 동반된 상의하 거대 세포 성상세포종의 내시경적 수술 - 증 례 보 고 -
임정환,송준혁,김명현,박향권,김성학,신규만,박동빈,Lim, Jeong-Hwan,Song, Jun-Hyeok,Kim, Myung-Hyun,Park, Hyang-Kwon,Kim, Sung-Hak,Shin, Kyu-Man,Park, Dong-Been 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.4
The authors present a rare case of subependymal giant cell astrocytoma which successfully treated with endoscopic tumor resection. A 15-year-old boy was presented with multiple episode of generalized seizure and intermittent headache for 5 years. The patient had facial adenoma sebaceum, multiple nevi on his back, and mental retardation. Cerebral MRI scans showed a round tumor located at the frontal horn of right ventricle near the foramen monro. The tumor was totally removed with endoscopic procedure and histologically confirmed as a subependymal giant cell astrocytoma. Subependymal giant cell astrocytomas can cause all the clinical problems that are associated with other types of intracranial tumor. However, surgical indication is not well standardized, because of the lack of basic knowledge about the tumor and the likelihood of surgical morbidity. We believe that endoscopic surgery, a minimally invasive technique, can circumvent the surgical disadvantage while achieving the surgical goal.
전남대학교 병원에서 2000년 이후 진단된 폐암의 임상 특성
임정환 ( Jung Hwan Lim ),반희정 ( Hee Jung Ban ),오인재 ( In Jae Oh ),김수옥 ( Soo Ok Kim ),손준광 ( Jun Gwang Son ),정종필 ( Jong Pil Jeong ),김규식 ( Kyu Sik Kim ),김유일 ( Yu Il Kim ),임성철 ( Sung Chul Lim ),김영철 ( Young Chu 대한결핵 및 호흡기학회 2006 Tuberculosis and Respiratory Diseases Vol.61 No.5
Background: Lung cancer has been the leading cause of cancer death in South Korea since 2000. This study examined the clinical characteristics of lung cancer patients diagnosed in a community hospital from the year 2000 to 2005, and compared these results with previously reported statistical data. Method: The lung cancer data in a form of an electronic medical record was downloaded from the hospital medical information system. The clinical characteristics of the 1,509 patients with lung cancer were analyzed retrospectively. Result: The mean age of the patients was 63.7 years. 82.5% and 74.5% of the patients were men and smokers, respectively. Squamous cell carcinoma (41.6%) was the most common pathology type followed by adenocarcinoma(32.3%) and small cell carcinoma(13.9%). When 604 patients who were diagnosed from 2000 to 2003 were compared with 905 patients diagnosed from 2004 to 2005, the age of patients increased significantly (61.5 years vs. 65.1 years; p<0.001) and the proportion of adenocarcinomas was significantly higher(29.3% vs. 34.4%; p=0.046). Conclusion: Among the major histology types of lung cancer, the incidence of adenocarcinoma has been increasing recently. The age of the lung cancer patients at diagnosis is getting older. This is despite the fact that the distributions of the initial anatomic stages have not changed significantly. (Tuberc Respir Dis 2006; 61: 427-432)
심현정 ( Hyun Jeong Shim ),임정환 ( Jung Hwan Lim ),이석 ( Seck Lee ),김대현 ( Dae Hyun Kim ),박강진 ( Kang Jin Park ),이세련 ( Se Ryeon Lee ),정종필 ( Jong Pil Jeong ),손준광 ( Jun Gwang Son ),김수옥 ( Soo Ok Kim ),오인재 ( In J 대한결핵 및 호흡기학회 2006 Tuberculosis and Respiratory Diseases Vol.61 No.5
Leiomyoma of the bronchus is a very rare benign tumor of the lung. Most endobronchial leiomyomas occur as secondary foci of primary uterine leiomyoma. We herein report a case with endobronchial tumor that had a different pathology from a primary resected uterine leiomyoma and was therefor considered a primary endobronchial leiomyoma. A 51-year-old woman with a history of uterine myoma presented with productive cough and fever. Bronchoscopy revealed a lightly yellow colored mass lesion that totally obstructed the orifice of the left lower lobe of the lung. The diagnosis of leiomyoma was made by histological examination of the obtained specimen. We considered the possibility of a benign metastasizing pulmonary leiomyoma. For treatment and differential diagnosis, a left lower lobe lobectomy of the lung and total hysterectomy with bilateral salphingooopherectomy were performed. The differences between lung and uterine lesions were confirmed by morphologic finding and immunohistochemical staining. The pathological diagnosis was primary endobronchial leiomyoma combined with uterine myoma. (Tuberc Respir Dis 2006; 61: 490-495)
박석주(Park, Seok-Joo),임경수(Lim, Kyeong-Soo),임정환(Lim, Jeong-Hwan) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Computational simulation has been performed to design the filtration system for Korea model IGCC demonstration plant. The filtration system for optimal design has four effective filters corresponding to the clusters composed of a group of ceramic candle filters. It was analyzed how the different entrance geometry influences the flow field and the particle behavior in the filtration system. The particle loading is minimum when the gas mixed with particles flows into the filter vessel with a shroud tube through a tangential inlet. However, the particle loading is maximum when the gas with particles enters the filter vessel through a normal inlet which a entrance tube extended from. By controling adequately both conditions of inflow, the filtration system can be operated optimally to prolong the filter life-time and to save the energy for cleaning filters.
IGCC용 세라믹캔들필터 집진장치에서의 가스 유입 및 탈진 조건에 따른 차압 특성 변화
박석주(Park, Seok-Joo),임경수(Lim, Kyeong-Soo),임정환(Lim, Jeong-Hwan) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
IGCC (석탄가스화 복합발전) 시스템 공정 중 가스화기에서 발생되는 합성가스 내에는 높은 농도의 분진들이 함유되어 있기 때문에 하부 공정들을 보호하기 위해서는 가스화기 후단에 집진장치가 필히 설치되어야 한다. 집진장치의 설계 제작 운전에 있어서 점착성 분진층 부착,분진 브리징, 필터 파손 현상 등과 같은 다양한 문제점들로 인하여 고온의 합성가스를 처리하는 데는 아직 기술적 한계들이 산재해 있는 상황이다. 이와 같은 문제점들은 필터에 부착된 분진층의 탈진성능을 향상시키거나, 필터의 열피로를 줄일 수 있도록 필터 재생을 위한 탈진의 횟수를 줄이는 방법을 통하여 해결될 수 있다. 본 연구에서는 파일롯 규모의 IGCC용 세라믹캔들필터 집진장치에서의 가스 유입 및 탈진 조건에 따른 집진장치의 차압 특성 변화를 수치해석과 실험을 통하여 분석함으로써 탈진성능을 향상시킬 수 있는 조건과 탈진 횟수를 최소화시킬 수 있는 방안을 도출하고자 하였다.