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Clinical Research Article : The effect of Low fresh gas flow rate on sevoflurane consumption
( Ho Geol Ryu ),( Ji Hyun Lee ),( Kyung Ku Lee ),( Nam Su Gil ),( Chong Soo Kim ),( Sung Eun Sim ),( Sang Chul Lee ),( Seong Won Min ) 대한마취과학회 2011 Korean Journal of Anesthesiology Vol.60 No.2
Background: In an era of medical cost containment, cost-effectiveness has become a major focus in healthcare. The effect of a new policy on the use of low fresh gas flow during maintenance of general anesthesia with volatile anesthetics was evaluated. Methods: The numbers and duration of general anesthesia cases using sevoflurane 5 weeks prior to and 15 weeks after policy implementation were retrieved from the electronic medical records database. The number of sevoflurane bottles consumed was also assessed. The anesthesia hours per bottle of sevoflurane were compared before and after policy implementation. Results: The number of anesthesia hours performed per bottle of sevoflurane increased by 38.3%. The effect varied over time and tended to fade with time. Conclusions: The implementation of a low fresh gas flow rate policy effectively reduces the amount of sevoflurane consumed for the same duration of anesthesia. (Korean J Anesthesiol 2011; 60: 75-77)
압축을 적용한 Erasure Coding의 성능 측정 및 분석
김은경(Eun-Kyung Kim),심봉걸(Bong-Geol Sim),임승호(Seung-Ho Lim) 한국정보기술학회 2021 한국정보기술학회논문지 Vol.19 No.9
A parity management scheme called Erasure Coding is widely used in cloud storage and data centers to increase the stability of stored data. Erasure Coding provides high stability and space efficiency compared to the other data parity management system, however, it still takes a lot of computation time due to data encoding and decoding overhead. In addition, data cannot be recovered when a data error of more than the number of parity blocks occurs. In this paper, the data encoding efficiency is improved by mixing the erasure coding and compression. In the proposed method, the error can be recovered even if a data error greater than the number of parity blocks occurs. The compression is added to SimEDC, which is an erasure coding simulation tool developed for data center. When the compression technique was mixed with the erasure coding, it was confirmed that the data recovery performance was improved compared to the existing one.
편마비 환자에서 정량적 감각기능 검사로 측정한 온도감각역치
배하석,심은결,윤태식,이정민,김성민 이화여자대학교 의과대학 2009 EMJ (Ewha medical journal) Vol.32 No.1
Objectives:Hemiplegic patients with unilateral cerebral lesions suffer from sensory deficit as well as motor deficit. But clinical assessment of thermal sensation is one of the least reliable components of neurological examination and is difficult to quantify. Methods:We measured thermal sensory thresholds of cold sense, warm sense, cold pain and hot pain in hemiplegic patients with thermal sensory analyzer(TSA). To investigate and quantify the thermal sensory deficit of hemiplegic patients, we compared the measurements with normal con-trols, between body regions, and between hemiplegic and sound side. Results:Hemiplegic patients showed impaired thermal sensory thresholds in all modalities compared to their sound side and normal controls. Conclusion:Quantitative sensory test using thermal sensory analyzer can be useful to quantify the thermal sensory deficit and follow up the progress.
Sun Mi Kim,박은숙,Eun Geol Sim,Seong Gyu Lim 대한재활의학회 2012 Annals of Rehabilitation Medicine Vol.36 No.1
Objective To determine reliability and clinical use of two methods of migration index (MI) in CP patients with or without hip dysplasia. Method The materials included radiographs of 200 hips of children with cerebral palsy. Conventional anteroposterior radiographs of the pelvis were taken with the child in the supine position with standardized methods. Two rehabilitation doctors measured the migration index using two methods. In the classic method,the lateral margin of the acetabular roof was used as a landmark and in the modifi ed method the lateral margin of the sourcil was used as a landmark. Each rater measured the migration index at three separate times with a time interval of at least one week. Intraclass correlation (ICC) was used to test the inter- and intra-rater reliability. Results MI shows excellent intra-rater reliability in both the classic and modified methods, but the inter-rater reliability was higher in the classic method than in the modified method. When categorized according to the sourcil classifi cation, inter-rater reliability was higher in the normal sourcil type and lower in the dysplastic sourcil types. Conclusion Generally, the classic method showed higher reliability than the modifi ed method, even though the reliability of the MI measurement was relatively high with both methods. Objective To determine reliability and clinical use of two methods of migration index (MI) in CP patients with or without hip dysplasia. Method The materials included radiographs of 200 hips of children with cerebral palsy. Conventional anteroposterior radiographs of the pelvis were taken with the child in the supine position with standardized methods. Two rehabilitation doctors measured the migration index using two methods. In the classic method,the lateral margin of the acetabular roof was used as a landmark and in the modifi ed method the lateral margin of the sourcil was used as a landmark. Each rater measured the migration index at three separate times with a time interval of at least one week. Intraclass correlation (ICC) was used to test the inter- and intra-rater reliability. Results MI shows excellent intra-rater reliability in both the classic and modified methods, but the inter-rater reliability was higher in the classic method than in the modified method. When categorized according to the sourcil classifi cation, inter-rater reliability was higher in the normal sourcil type and lower in the dysplastic sourcil types. Conclusion Generally, the classic method showed higher reliability than the modifi ed method, even though the reliability of the MI measurement was relatively high with both methods.
Dong Jin Kim,나동욱,박은숙,Eun Geol Sim,Ki Jung Kim,Young Uhk Kim 대한재활의학회 2011 Annals of Rehabilitation Medicine Vol.35 No.3
Objective To investigate the reliability of inspection-based classifi cation of sagittal gait patterns in children with bilateral spastic cerebral palsy (CP). Method Video clip recordings of gait patterns and sagittal kinematic data obtained by a computerized motion analysis system from 91 patients with bilateral spastic CP were reviewed. The abnormal gait patterns were classifi ed into 4 groups using the method described by Rodda et al. Visual observation-based classifi cation (visual classifi cation) was compared with classifi cation by 3D analysis-based methods (3D classifi cation). The reliabilities of visual classifi cations made by an experienced physician and a trainee physician were analyzed. Results The consistency of inspection-based gait classifi cation using kinematic data analysis was demonstrated by an experienced physician (Kappa coeffi cient (k)=0.67, p<0.001). However, the consistency was low for the trainee physician (k=0.37, p<0.001). Group III (apparent equinus) was commonly confused with group IV (crouch gait) by the trainee physician, resulting in lower agreement for those two evaluation groups than for other patterns. Video observation showed low reliability in comparisons made between the experienced and the trainee physician (k=0.37, p<0.001). Conclusion There was substantial agreement of gait classifi cation between video observation and kinematic data analysis by the experienced physician, but not by the trainee physician. Low reliability was also demonstrated for inspection-based gait classifi cation.
소형 계수용 및 영상용 감마프로브 시스템의 설계와 성능평가
양묘근,곽철은,심용걸,김희중,최용,정준기,이명철,고창순,Yang, Myo-Geun,Kwark, Cheol-Eun,Sim, yong-Geol,Kim, Hee-Joung,Choi, Yong,Chung, Jung-Key,Lee, Myung-Chul,Koh, Chang-Soon 대한의용생체공학회 1997 의공학회지 Vol.18 No.3
As a microimaging device detecting gamma rays emitted from small lesions or tumors during operation, the intraoperative surgical probe has been proposed and is now under development. We have designed a multipurpose portable gamma prove system and evaluated the performance both for the absolute counting purpose of residual radioactivities and for the localizing capability of gamma events using the NaI(Tl) crystal and two types of photomultiplier tubes(PMTs). Counting efficiencies in the range of routine clinical use of radiation dose were measured using the assembly of single channel PMTs and 0.5 inch thick NaI(Tl) crystal of 1 inch diameter. The positioning of gamma events for imaging purpose requires the multiple channel PMTs with appropriate positioning electronics. We have designed a simple and reliable positioning circuit based on the concept of modified Anger. In preliminary experiments using the multiple channel PMT of 3 inch diameter and the dim lighth source, we were able to trace and localize the correct position with reduced positioning error by the use of two multiplier/divider chipset and simplified peripherals. The energy resolutions for the counting gamma probe measured as full width at half maximum(FWHM) for Cs-137, F-18, Tc-99m were 12%, 13%, and 36%, respectively. The spatial resolution for the imaging gamma probe measured as FWHM for green LED was 2.9 mm. The results indicate that the currently developing probe is very promising and could be very useful for many applications in nuclear medicine. Future studies will include developing collimators, improving interface hardwares, and evaluating the system with clinical data.