• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2007.04a
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• pp.17-21
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• 2007

Ultrasonic inspection method is more profitable than X-ray radiographic inspection in cost and effect of defect detection such as debond, and it doesn't need special facilities. The method can also be a possible real time inspection with safety. This report explains the experiment and theoretical modeling analysis of the inspection methods of propellant/liner debond using ultrasonic multi-reflection in rocket motor. From the results, it is possible to detect the defect of propellant/liner debond and its signal is distinguishable with normal. And, it is approximately coincide with both experimental signal and modeling.

• 선박안전기술공단 소식
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• s.25
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• pp.5-5
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• 2008

• 선박안전기술공단 소식
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• s.26
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• pp.5-6
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• 2008

• 선박안전기술공단 소식
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• s.27
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• pp.6-6
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• 2008

• 선박안전기술공단 소식
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• s.30
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• pp.6-6
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• 2008

• Proceedings of the KSMRM Conference
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• 2001.11a
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• pp.171-171
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• 2001

목적： 뇌 자기공명영상에서 Z-score를 이용한 관류 영상과 조영전후의 감산에 의한 역동 영상의 관류 양상을 비교 관찰 하고자 한다. 대상 및 방법： 뇌 자기공명영상에서 이상 소견이 없는 젊은 환자 1명, Moya moya 환자 1, 중대뇌동맥 폐색 환자 1명, 외상후 증후군 1명, 뇌종양 1예를 대상으로 하여, 뇌의 routine 자기공명 영상과 함께 Gd-DTPA 0.1 mmol/kg를 급속 주사 후 자화율 대조 EPI 영상을 얻었다. 영상 기기는 Magnetom Vision(Siemens Medical Systems, Erlangen, Germany)이며, EPI 영상 지표들은 TR/TE는 0.8/29 msec, slice 두께 6 mm, slice 수 10, 화소수 128 $\times$ 128, FOV 215 $\times$ 215 mm, 영상획득 1 회, 1회 검사시간 1.32 초, 검사수 30 회로서, 총 검사시간은 40 초였다. 검사 후 영상처리(post processing)는 Magnetom Vision의 VB31D 자체 프로그램을 이용하였는데, 2-score를 이용한 관류영상은 조영제 유입전 영상들, 조영제 최대 유입기 영상들, 그리고 조영제 배출기 영상들 4-5 회를 각각 한 군으로 하여, Z-score 1.2에서 2.0 사이에서 여러번 반복하여 영상을 재구성하였다. 감산에 의한 역동영상은 조영제 도달 전의 영상으로부터 조영제 유입 후의 영상을 차례로 빼어서 영상을 재구성하였으며, 이들 영상을 재정리하여 각 단면의 시간 경과에 따른 관류 양상을 연속하여 관찰하였다 두 방법에 의한 영상 재구성은 각각 약 10분 정도가 소요되었다.

• Proceedings of the Korea Contents Association Conference
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• 2014.11a
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• pp.211-212
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• 2014

단일에너지 복부 검사에서 사용했던 조영제 양 대비 30%, 40%, 50%, 60%, 70%로 각각 설정하여 영상을 획득한 후 대동맥, 하대정맥, 간문맥, 간실질에 관심영역을 설정하여 조영증강정도(houns -field unit; HU)를 구하여 단일에너지에서 측정된 부위와의 값을 비교 분석하였다. 그 결과 기존대비 60%로 조영제를 설정한 군에서는 대동맥 HU : $210.80{\pm}13.609$, 하대정맥 HU : $190.40{\pm}25.215$, 간문맥 $198.40{\pm}21.232$, 간실질 HU : $119.20{\pm}7.98$로 각각 측정되었으며. 단일에너지 복부 CT 검사는 대동맥 HU : $205.40{\pm}16.426$, 하대정맥 HU : $188.20{\pm}21.476$, 간문맥 HU : $195.40{\pm}22.744$, 간실질 HU : $121.00{\pm}6.595$ 이었다. 따라서 이중에너지를 이용하여 복부 조영 CT검사를 시행할 때 조영제의 양을 60%로 설정한 후 검사하는 것이 각 장기에서의 단일에너지 조영검사시와 비슷한 조영증강정도를 획득할 수 있다.

• Fire Science and Engineering
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• v.25 no.2
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• pp.95-100
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• 2011

The ultimate purpose of this study is to improve the irrational system related to flame retardant coating performance test of field flame retardant coating articles and to secure the reliability of flame retardant coating through rational flame retardant coating test. To achieve this, the analysis was conducted on the interior finishing materials used in the interior fields and the trends of recent field flame retardant coating, based on the results of flame retardant coating performance test of field flame retardant coating articles which the first-line fire stations have recently conducted. And I attempted to present the methods of field flame retardant coating performance test suitable to current realities and the ways of improvement for securing reliability by analyzing the problems with the methods and procedures of field flame retardant coating articles and the registration system of flame retardant coating business.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• v.3 no.2
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• pp.151-159
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• 2000

Purpose: Recently, a wide application of gastrofiberscopy in the pediatric group have revealed that nodular duodenitis is not an uncommon disease in children and is suspected to be associated with H. pylori infection. The aim of this retrospective study was to investigate the clinical and histopathologic features in children with nodular duodenitis, and to assess the correlations beween both. Methods: During a period of 5 years (Jan. 1995~Dec. 1999), we investigated clinical, endoscopic and histopathologic features of 39 consecutive patients diagnosed as having nodular duodenitis at Pediatric department of Seoul Red Cross Hospital. In 35 children with nodular duodenitis endoscopic biopsy specimens were stained with Hematoxylin & Eosin and Giemsa's stain, and were graded according to the criteria outlined by Triadafilopoulos, Whitehead et al., and Prieto et al.. Statistical analyses were performed with Graph PAD InStat. Results: The prevalence rate of nodular duodenitis was 17.1% and the most frequent chief complaint was abdominal pain (69.2%). Endoscopically grade 1 was the most common (45.7%) and nodular gastritis was coexistent in 28.3%. The most common histology of the duodenum was grade 2 (54.3%), and the most common histologic score of the stomach was 2 (42.9%). H. pylori was found in the duodenum in 37.1%, and in the stomach in 31.4%. The correlation coefficient between the endoscopic grade and the histologic grade of nodular duodenitis was 0.3983 (p=0.0178). And the correlation coefficient between the histologic grade and the grade of H. pylori colonization in the duodenum was 0.5154 (p=0.0018). Conclusion: There was significant correlation between the endoscopic grade and the histologic grade of nodular duodenitis, and was also significant correlation between the histologic grade and the grade of H. pylori colonization in the duodenum. Therfore H. pylori infection should be regarded as an etiologic factor of nodular duodenitis.

• Korean Journal of Clinical Laboratory Science
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• v.52 no.4
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• pp.317-326
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• 2020

Deep blocking of consciousness alone does not prevent a reaction to severe stimuli, and copious amounts of pain medication do not guarantee unconsciousness. Therefore, anesthesia must satisfy both: the loss of consciousness as well as muscle relaxation. Muscle relaxants improve the intra-bronchial intubation, surgical field of vision, and operating conditions, while simultaneously reducing the dose of inhalation or intravenous anesthesia. Muscle relaxants are also very important for breathing management during controlled mechanical ventilation during surgery. Excessive dosage of such muscle relaxants may therefore affect neurological examinations during surgery, but an insufficient dosage will result in movement of the patient during the procedure. Hence, muscle relaxation anesthesia depth and neurophysiological monitoring during surgery are closely related. Using excessive muscle relaxants is disadvantageous, since neurophysiological examinations during surgery could be hindered, and eliminating the effects of complete muscle relaxation after surgery is challenging. In the operation of neurophysiological monitoring during the operation, the anesthesiologist administers muscle relaxant based on what standard, it is hoped that the examination will be performed more smoothly by examining the trends in the world as well as domestic and global trends in maintaining muscle relaxant.