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Value of Repeat Brain Computed Tomography in Children with Traumatic Brain Injury
조호준,임용수,김진주,조진성,현성열,양혁준,이근 대한응급의학회 2015 대한응급의학회 학술대회초록집 Vol.2015 No.2
Introduction: Traumatic brain injury is the most common cause of pediatric trauma patients came to the emergency department. Without guidelines, many of these children underwent repeat brain computed tomography. The purpose of this study was to evaluate the value of repeat brain CT in children with TBI. Material & Methods: We conducted a retrospective study of TBI in children younger than 19 years of age who visited the emergency department from January 2011 to December 2012. According to the GCS and PGCS score of the patients, study population divided in three groups. Clinical data collected included age, mechanism of injury, type of TBI, and outcome. Results: A Total 83 children with TBI received repeat brain CT. There were no need for neurosurgical intervention in mild TBI (GCS 13-15) group who underwent routine repeat CT. 4 patients of mild TBI group, received repeat brain CT due to neurological deterioration, and one patient underwent neurosurgical intervention. Routine repeat CT identified 12 patients with radiographic progression. One patient underwent neurosurgical intervention based on the second brain CT finding, who belonged to the moderate TBI (GCS 9-12) group. Conclusion: Our study showed that children with mild TBI can be observed without repeat brain CT when there is no evidence of neurologic deterioration. Further study is needed for establish indication for repetition of CT scan in order to avoid unnecessary radiation exposure of children.
차량용 브레이크 코너 모듈에서 패드 접촉 면압 분포가 스퀼 현상에 미치는 영향
조호준(Hojoon Cho),이재한(Jaehan Lee),이종화(Jongwha Lee),장진희(Jinhee Jang),김인동(Indong Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Automotive disk brakes generally perform braking by means of friction between the brake disk and pads. Due to the friction, various brake noise can generate from low frequency vibration and high frequency noise. Especially, squeal noise, which generates high frequency noise of pure tone, leads to unpleasant feeling not only to driver but also pass-by people and makes warranty issue of high level. This paper is a study of pad contact pressure distribution on squeal noise phenomenon based on finite element analysis and experiment. For this, modal testing of components and assembly model in a brake corner module is performed and correlated with finite element model. Mode map of components and assembly is composed by performing modal simulation of a correlated finite element model. Operating deflection shape is obtained at squeal noise occurrence condition by using 3D laser vibrometer. Instability mode of complex eigenvalue analysis result is correlated with ODS through changing boundary conditions of FE model. Static pad pressure distributions are measured before and after squeal noise dynamo test, and are simulated in accordance with pad arc lengths of radial chamfer. The Effective pad pressure distribution is determined through analysis of pressure distribution results. Instability mode and mode map is analyzed for finding main factors of squeal noise occurrence. Finally, this paper proposes the design recommendation and complex eigenvalue analysis model using effective pressure distribution.
소아 두부외상 환자에서의 반복적인 두부 CT 검사의 유용성
조호준 ( Ho Jun Jo ),임용수 ( Yong Su Lim ),김진주 ( Jin Joo Kim ),조진성 ( Jin Seong Cho ),현성열 ( Sung Youl Hyun ),양혁준 ( Hyuk Jun Yang ),이근 ( Gun Lee ) 대한외상학회 2015 大韓外傷學會誌 Vol.28 No.3
Purpose: Traumatic brain injury (TBI) is the most common cause of pediatric trauma patients came to the emergency department. Without guidelines, many of these children underwent repeat brain computed tomography (CT). The purpose of this study was to evaluate the value of repeat brain CT in children with TBI. Methods: We conducted a retrospective study of TBI in children younger than 19 years of age who visited the emergency department (ED) from January 2011 to December 2012. According to the Glasgow Coma Scale (GCS) and Pediatric Glasgow Coma Scale score of the patients, study population divided in three groups. Clinical data collected included age, mechanism of injury, type of TBI, and outcome. Results: A Total 83 children with TBI received repeat brain CT. There were no need for neurosurgical intervention in mild TBI (GCS score 13-15) group who underwent routine repeat CT. 4 patients of mild TBI group, received repeat brain CT due to neurological deterioration, and one patient underwent neurosurgical intervention. Routine repeat CT identified 12 patients with radiographic progression. One patient underwent neurosurgical intervention based on the second brain CT finding, who belonged to the moderate TBI (GCS score 9-12) group. Conclusion: Our study showed that children with mild TBI can be observed without repeat brain CT when there is no evidence of neurologic deterioration. Further study is needed for establish indication for repetition of CT scan in order to avoid unnecessary radiation exposure of children. [ J Trauma Inj 2015; 28: 149-157 ]