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송철규,이명호,김영배,Song, Chul-Gyu,Lee, Myoung-Ho,Kim, Young-Bae 대한의용생체공학회 1992 의공학회지 Vol.13 No.3
This paper deal with the acoustic cues of Pyoung-An Do dialect using linear prediction. Also, this paper descrbes a statistical comparison between standard tone speech data and Pyoung-An Do dia lects. The analysis done mainly focused on the distribution of formants and pitch periods accord to ac- cents variation. For the purpose of objective comparison, the experiments are performed by extracts for- mant LPC spectrum and pithch periods from average magnitude difference function waveforms. Summing up the results, In disyllable words (VCV pattern) , prepositioned vowels have longer phona lion time than postpositioned vowels and the intrin, iii phonation time is whore longer in the low vowels than in the high ones. The africative consonants show the mixed characteristics of the plosive and frlc ative consonants. The remarkable acoustic cues are the low frequency noise-like waves just before the 1st formants in the plosive consonants, the high frequency noise-like waves in the fricative consonants, and phonation time is not affected by the kinds of prepositioned or postpositioned vowels.
Evaluation of Clinical Effectiveness of 3D Digital Endoscopic Image
송철규,김경섭,김남균,Song, Chul-Gyu,Kim, Kyeong-Seop,Kim, Nam-Gyun The Korean Society for Digital Imaging in Medicine 2002 대한디지털의료영상학회논문지 Vol.5 No.1
본 연구의 목적은 복강경 수술환경에서 2D와 3D 내시경 비디오 영상이 수술에 미치는 영향을 평가하기 위한 연구이며, 이를 위해 3D 내시경 시스템을 구성하고 성능 평가를 수행하였다. 결과적으로 본 연구에서 제안한 3D 방식이 기존의 전자셔터 방식에 의한 3D 영상에 비해 화질과 시야각이 우수하며, 2종류의 모의 수술 실험 비교를 한 결과, 제안한 방식의 디지털 영상을 이용하는 경우가 성능이 가장 우수함을 정량적으로 확인하였다. This paper represents the design of 3D endoscopic video system in order to improve visualization and enhance the ability of the surgeon to perform delicate endoscopic surgery. Minimally invasive techniques have set new standards in all surgical may experience less post-operative discomfort, shorter hospitalization, and quicker recuperation. Finally, the aim of the present study was to determine the influence of 2D and 3D video imaging on defined tasks on a laparoscopic trainer.
송철규(Chul Gyu Song),유상훈(Sang Hun Ryu),김도훈(Do Hyun Kim) 대한전기학회 2011 전기학회논문지 Vol.60 No.6
Photoacoustics has been broadly studied in biomedicine, for both human and small animal tissues. Photoacoustics uniquely combines the absorption contrast of light or radio frequency waves with ultrasound resolution. Moreover, it is non-ionizing and non-invasive, and is the fastest growing new biomedical method, with clinical applications on the way. This paper provides a brief recap of recent developments in photoacoustics in biomedicine, from basic principles to applications. The emphasized areas include the new imaging modalities as well as translational research topics. A primary PA application in biomedicine is photoacoustic tomography (PAT). The past decade has seen fast developments in both theoretical reconstruction algorithms and innovative imaging techniques, and PAT has been implemented in imaging different tissues, from centimeter-large breast tumors to several micrometer-large single red blood cels (RBC). PAT now provides structural, functional and molecular imaging. Overall, PA techniques for biomedicine are maturing. They have been widely used to study both animal and human tissues. Recently, more and more research focuses on clinical applications. Commercialized PA systems are expected to be available in the near future, and wide clinical PA applications are foreseen.
송철규(Chul-Gyu Song),서정환(Jeong-Hwan Seo),한상형(Sang-Hyung Han),김거식(Keo-Sik Kim),안양수(Yang-Su An) 대한전기학회 2009 전기학회논문지 Vol.58 No.6
Spasticity is a velocity-dependent stretch reflex disorder of the body motor system developing after the injury of the central nervous system, in which certain muscles are continuously contracted involuntarily. Conventional methods such as the modified Ashworth scale, Spasm frequency scale, pendulum test and isokinetic dynamometer had some disadvantages: limitation in discriminating the increase of resistance, immovable and expensive device, not enough study parameters. Therefore, it is necessary to introduce clinically more useful instrument, which can produce objective data and are more convenient on spasticity measurement. Spasticity measuring methods were reviewed and a new measuring instrument was designed and introduced. The new measuring system is a portable spasticity-measurement system, which encompass various scopes of spasticity-related human signals such as electrophysiologic, kinematic and biomechanical data. Our device was designed in order to measure the joint angle, angular velocity, electromyographic signals and force. We suggest that this new system can diagnose the spasticity of the muscles, objectively.
김덕원,송철규,황수관,Kim, Deok-Won,Song, Chul-Gyu,Hwang, Soo-Kwan 대한의용생체공학회 1992 의공학회지 Vol.13 No.2
Bioelectrical Impedance method for measuring human body composition is based upon the principle that the electrical conductivity of the fat-free mass (FFM) is far greater than that of the (at. Deter- mination o( impedance was nlade in 30 healthy and obese men aged $40.9{\pm}14.7$yr (mean${\pm}$SD) and 25 healthy and obese women aged $44.0{\pm}10.2$ yr. A commercial impedance body fat analyzer was used with a four electrode arrangement that introduced a painless constant current(ImA at 50 kHz) into the body. Linear relationships were found between impudence values and FFM(r=-0.786) and between weight and FFM(r=0.837). Signigicant increases in the correlation coefficients were ob served when the predicator Hta/z was regressed against FFM(r=0.912) where Ht Is height and Z Is impedance. A linear regression equation, FFM=0.586(Htf/z) +0.317(Weight) -1.674(r=0.977), was found. The correlation coefficient of % body fat between the impedance and infrared methods was 0.898. These data Indicate that the bioelectrical impedance technique is a reliable and valld approach for the estimation of human body composition. This method Is safe, noninvasivr, prouides rapld measure menu, requires little operator skill and subject cooperation, and Os portable. Finally measurement of percent body fat was made possible using both the regression equation and a developed impedance measuring device which measures impedance between wrist and ankle.
휴대용 요역동학 검사 시 근전도 신호를 이용한 복압측정 방법
김거식(Keo-Sik Kim),송철규(Chul-Gyu Song),서정환(Jeong-Hwan Seo) 대한전자공학회 2008 電子工學會論文誌-SC (System and control) Vol.45 No.6
복압 측정을 위한 기존의 카테터 방법은 배뇨압에 영향을 줄 수 있는 많은 오차를 유발할 수 있으며 환자에게 불편함을 야기한다. 이러한 문제점을 해결하기 위해, 본 연구에서는 표면 근전도를 이용하여 비침습적으로 복압을 측정할 수 있는 새로운 방법을 개발하였다. 연구 결과, 기존 직장 카테터를 이용하여 측정된 복압과 복압측정 알고리즘을 이용하여 추정된 복압 간의 상관계수는 0.79±0.06이었으며, 두 신호간의 오차는 0.10±0.07이었다. 본 연구에서 개발된 복압추정 알고리즘을 이용하면 휴대용 요역동학 검사 시 편리하게 간접적으로 복압을 측정할 수 있을 것으로 생각된다. Conventional rectal catheters which are used for the measurement of abdominal pressure can cause erroneous result affecting detrusor pressure, and the catheter itself is not comfortable to the patients. To reduce these problems, we invented a new method for measuring abdominal pressure in non invasive manner using surface electromyography (EMG) signals of the rectus abdominis muscle. Our results showed that the correlation coefficient and root mean square error (RMSE) between the measured abdominal pressures by the conventional rectal catheters and the estimated values by our proposed algorithm were 0.79±0.06 and 0.10±0.07, respectively. These findings suggest that the surface EMG of rectus abdominis muscle might be used indirectly for more convenient measurement of abdominal pressure on ambulatory urodynamic study.