경부 추간관절차단 후 발생한 경추 경막외 혈종

최재형,조영순,김호중 대한응급의학회 2013 대한응급의학회지 Vol.24 No.4

Facet joint nerve blocks is the most commonly utilized interventions in managing chronic spinal pain. A fluoroscopically directed facet joint nerve block for pain management may result in a rare complication of spinal epidural hematoma causing acute myelopathy. Although this complication is well-known with epidural anesthesia (where it is usually seen with impaired hemostasis), there are surprisingly few case reports of epidural hematoma after a facet joint nerve block. We report here a case of a 58-year-old man, with no evidence of coagulopathy and not taking antiplatelet medication,having a sudden onset of acute cervical myelopathy from a large cervical epidural hematoma one hour after a facet joint nerve block. Following prompt surgical evacuation of the clot, the patient made a nearly complete recovery. Spinal epidural hematoma after spinal puncture is usually associated with impaired hemostasis. However, this case illustrates that it may occur in the absence of known risk factors. The delayed onset and the absence of risk factors have implications for the use of this procedure in chronic pain management.

Glucose-sensitive amphiphilic polymers

최재형,김진철,조성민,권택관 한국고분자학회 2008 한국고분자학회 학술대회 연구논문 초록집 Vol.33 No.1

회전익 항공기 전륜착륙장치 단속거동 현상 개선연구

최재형,장민욱,이윤우,윤종진,Choi, Jae Hyung,Chang, Min Wook,Lee, Yoon-Woo,Yoon, Jong Jin 한국항공운항학회 2017 한국항공운항학회지 Vol.25 No.3

The Nose Landing Gear(NLG) of Rotary Wing Aircraft is an essential equipment in Landing System for pilot to perform a flight mission. It supports the fuselage at ground and absorbs the impact from the ground when landing, thereby, these functions sustain operational capability for pilot and crew. However, the A aircraft caused stick-slip behavior when it was stationed on the ground. Therefore, this paper summarizes pilot comment in operation which are classified by cause of occurrence and the troubleshooting process about each comment. It also describes design improvements which was derived from troubleshooting and suggests verification results of flight test.

SiAlON 원료분말제조를 위한 분무건조 과립분말의 형상과 크기에 미치는 공정변수효과

최재형,이소율,한윤수,이성민,남산,김성원,Choi, Jae-Hyeong,Lee, Soyul,Han, Yoonsoo,Lee, Sung-Min,Nahm, Sahn,Kim, Seongwon 한국재료학회 2017 한국재료학회지 Vol.27 No.12

SiAlON-based ceramics are some of the most typical ceramic materials used as cutting tools for HRSA(Heat Resistant Super-Alloys). SiAlON can be fabricated using ceramic processing, such as mixing, granulation, compaction, and sintering. Spray drying is a widely-used method for producing a granular powder of controlled morphology and size with flowability. In this study, we report a systematic investigation aimed at optimizing spherical granule morphology by controlling spray-drying parameters such as gas flow and feed rate. Before spray drying, the viscosities of the raw material slurries were also optimized with the amount of dispersant added.

Segmental Arterial Mediolysis으로 인한 신경색과 혈복강

최재형,조영순,김재우,이정원,문형준 대한응급의학회 2012 大韓應急醫學會誌 Vol.23 No.6

This article reports a patient with both a renal infarction and acute intra-abdominal hemorrhage secondary to a rare vascular disease, segmental arterial mediolysis. The patient was a 37-year-old male who presented with acute right flank pain. Abdominal and pelvic computerized tomography (CT) showed a right renal infarction. After three days, the right flank pain had diminished but left flank pain began. Visceral angiography revealed a wedge shape perfusion defect at the mid pole of the left kidney, suggesting a left renal infarction but there were no definite perfusion defects at the right kidney. After ten days, the patient complained of abdominal pain and 2 episodes of syncope. Abdominal CT revealed active bleeding from the splenic artery and a large amount of hemoperitoneum. After emergency embolization,the patient’s were stabilized. After 28 days, his condition was improved and discharged without complications. The angiographic and laboratory findings were consistent with a diagnosis of segmental arterial mediolysis involving the renal and splenic artery. This is the first case report of clinical progression related to segmental arterial mediolysis requiring emergent coil embolization.

신경학적 이상이 동반된 로타바이러스 위장관염 환아에서의 로타바이러스 유전형

최재형,김정미,김용주,오재원,김창렬,염명걸,설인준,강정옥 대한소아청소년과학회 2006 Clinical and Experimental Pediatrics (CEP) Vol.49 No.5

Purpose : This study was undertaken to determine the differences in genotypes of rotavirus and their incidence between patients with acute rotaviral enteritis who suffered neurologic complications and those who did not suffer neurologic complications. Methods : Among the 82 patients with rotaviral enteritis whose genotype was analyzed, 71 patients were not associated with neurologic complications(neurology(-) group), and eleven patients were associated with neurologic complications(neurology(+) group). Four G genotypes and four P genotypes were determined by reverse trans cription and multiplex polymerase chain reaction. Results : In the neurology(-) group, the number of G4, G3, G2 and G1 was 24(35.3 percent), 23 (33.8 percent), 17(25.0 percent) and 4(5.6 percent), respectively and the number of P6, P4, P8 and P9 was 26(36.1 percent), 23(31.9 percent), 22(30.6 percent) and 1(1.4 percent), respectively. G2P4, and G4P6 were the most frequently found com bination genotypes, respectively. In the neurology(+) group, the number of G2, G3 and G4 was 9(75.0 percent), 2(16.7 percent) and 1(8.3 percent), respectively and the number of P4, P6, P8 and P9 was 8(66.7 percent), 2(16.7 percent), 1(8.3 percent) and 1(8.3 percent), respectively. G2P4 was the most frequently found combination genotype. The incidence of each of the G2, P4 and G2P4 was significantly higher in the neurology(+) group when compared to that of each of the G2, P4, and G2P4 in the neurology(-) group. Conclusion : In the patients with acute rotavirus gastroenteritis associated with neurologic complications, the G1 genotype was not found and genotypes of the G2, P4, and G2P4 were more frequently found. 목 적 : 본 연구에서는 로타바이러스 위장관염 환아에서 신경학적 이상이 동반된 경우와 그렇지 않은 경우를 비교하여 로타바이러스 유전형의 분포와 빈도를 조사하고자 하였다.방 법 : 로타바이러스 위장관염 환아에서 로타바이러스 유전형을 밝힌 82례 중 71례는 신경학적 이상이 동반되지 않았으며 11례에서 신경학적 이상이 동반되었다. 4군의 G형과 4군의 P형이 reverse transcription, multiplex polymerase chain reaction을 통해 분석되었다.결 과 : 신경학적 이상이 동반되지 않은 군에서는 G4, G3, G2, G1형이 각각 24(35.3%), 23(33.8%), 17(25.0%), 4(5.6%)로, P6, P4, P8, P9형이 각각 26(36.1%), 23(31.9%), 22(30.6%), 1(1.4%)로 보고되었다. 또한 조합형으로 G2P4, G4P6이 가장 흔하게 관찰되었다. 신경학적 이상이 동반된 군에서는 G2, G3, G4형이 각각 9(75.0%), 2(16.7%), 1(8.3%)로, P4, P6, P8, P9형이 각각 8(66.7%), 2(16.7%), 1(8.3%), 1(8.3%)로 보고되었다. 또한 조합형으로 G2P4가 가장 흔하게 관찰되었다. 신경학적 이상이 있는 군에서 G2, P4, G2P4의 빈도는 신경학적 이상이 없는 군에 비해 그 빈도가 의미있게 높았다.

XML Parser를 활용한 최신 영화 정보 제공 연구

최재형,구민정 국제문화기술진흥원 2017 The Journal of the Convergence on Culture Technolo Vol.3 No.1

최근 스마트 폰 사용자가 늘어나면서 스마트 폰에 대한 여러 기능이 추가되고 있고 점점 더 발전되고 있으 며, 실제로도 실생활에 편리함을 위해 도움이 되는 많은 Application이 나오고 있다. 본 연구에서는 보고 싶은 영화 에 대한 정보를 뉴스 사이트 RSS로 XML 파서를 이용하여 영화와 관련된 뉴스기사를 호출하여 리스트로 출력하였 다. 본 안드로이드앱 서버는 Ubuntu로 구축하였으며, 구축한 게시판을 통해 최신 영화정보까지 제공하도록 하였으며, 원하는 정보를 클릭하면 상세정보를 제공하는 메뉴로 배치하였다. With the increase in the number of smart phone users, smart phones themselves are seeing progress in terms of available functions. Many applications, too, are being developed to increase convenience in daily life. This study issued a list of information on films that the user wishes to see, by using an XML parser to call news articles related to the films in question to the news site RSS. The Android App server was built using Ubuntu and the latest film information was provided through the board that was built. The menu was consisted in a manner so that when the information interested was clicked on, a more detailed set of information became available.

痲藥類 犯罪에 대한 規制方案

최재형 한국마약범죄학회 2000 마약범죄연구 Vol.6 No.-

전도냉각형 고온초전도 에너지저장장치의 전기적 특성

최재형,곽동순,천현권,김해종,김상현,Choi, Jae-Hyeong,Kwag, Dong-Soon,Cheon, Hyeon-Gweon,Kim, Hae-Jong,Kim, Sang-Hyun 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.2

The conduction-cooled HTS SMES is operated in cryogenic and high vacuum condition. Thus, Insulation design at cryogenic temperature and high vacuum is a key and an important element that should be established to accomplish miniaturization that is a big advantage of HTS SMES. However, the behaviors of insulators for cryogenic conditions in vacuum are virtually unknown. Therefore, we need active research and development of insulation concerning application of the conduction-cooled HTS SMES. Therefore, in this study, we experimented about insulation characteristic high vacuum and cryogenic similar to driving condition of SMES system. Also, investigated about insulation characteristic of suitable some materials to insulator for conduction-cooled HTS SMES. As this results, we possessed basis data for insulation materials selection and insulation design for development of 600 kJ class conduction-cooled HTS SMES.

Bacterial Contamination and Disinfection Status of Laryngoscopes Stored in Emergency Crash Carts

최재형,조영순,이정원,신희봉,이인경 대한예방의학회 2017 예방의학회지 Vol.50 No.3

Objectives: To identify bacterial contamination rates of laryngoscope blades and handles stored in emergency crash carts by hospital and area according to the frequency of intubation attempts. Methods: One hundred forty-eight handles and 71 blades deemed ready for patient use from two tertiary hospitals were sampled with sterile swabs using a standardized rolling technique. Samples were considered negative (not contaminated) if no colonies were present on the blood agar plate after an 18-hour incubation period. Samples were stratified by hospital and according to the frequency of intubation attempts (10 attempts per year) using the χ2-test and Fisher exact test. Results: One or more species of bacteria were isolated from 4 (5.6%) handle tops, 20 (28.2%) handles with knurled surfaces, and 27 (18.2%) blades. No significant differences were found in microbial contamination levels on the handle tops and blades between the two hospitals and two areas according to the frequency of intubation attempts. However, significant differences were found between the two hospitals and two areas in the level of microbial contamination on the handles with knurled surfaces (p<0.05). Conclusions: Protocols and policies must be reviewed to standardize procedures to clean and disinfect laryngoscope blades and handles; handles should be re-designed to eliminate points of contact with the blade; and single-use, one-piece laryngoscopes should be introduced.