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최광현,변윤식,박상희,Choi, Kwang-Hyeon,Byun, Youn-Shik,Park, Sang-Hui 대한의용생체공학회 1984 의공학회지 Vol.5 No.2
The EMG signal can be considered as a signal source that expresses the intention of man because it is a electrical signal generated when the man contracts muscles. For proportional control of prostheses, the control signal proportional to the mousle contraction level must be estimated. Typically a foul-wave rectifier and low-pass filter are used to estimate the proportional control signal from the EMG signal. In this paper, it is proposed to use a logarithmic transformation and a linear minimum mean square error estimator. A logarithmic transformation maps the myoelectric signal into an additive control signal-plus-noise domain and the Kalman filter is used to estimate the control signal as a linear minimum mean square error estimator. The performance of this estimator is verified by the computer simulation and the estimator is applied to the EMG obtained from the biceps brachii muscle of normal subjects.
류상,노경환,최광현,김원국,이원경,김도희,양국현,Ryu, Sang,Roh, Kyung Hwan,Choi, Kwang Hyeon,Kim, Won Guk,Lee, Won Kyung,Kim, Do Hee,Yang, Kuk Hyeon 한국세라믹학회 2018 세라미스트 Vol.21 No.3
In this study, the aspherical lens for optical communications produced not with an one-step pneumatic type of external pressurization system (existed GMP process) but a constant weight of self-loaded mold put up to upper core. So the lens is molding with self-loaded weight molding and it calls Weight Molding process. In self-loaded molding process, we measured changes of center thickness molding lenses with each variable molding temperatures and time to find the effect of center of lens thickness to search key factors. As experimental results, the center thickness reach to targeted lenses step time value was changed drastically and it depends by molding temperature. If the molding temperature gets higher, the targeted lens that is reaching to the center thickness step time value was decreased. To find the effect of life improvement on mold core by imposing the self-loaded molding process we molded with GMP(Glass molding press) method and self-loaded molding method for 9,000 times and measured the lenses shape accuracy and surface roughness to evaluate the core life. As a result the self-loaded molding method core has 2,000 times longer that GMP (Glass molding press) method. If we adopt self-loaded molding method of the optical aspherical lens molding in the future, we expect that it would reduce the expense of changing the molds by molding core life improvements.
류상(Sang Ryu),노경환(Kyung Hwan Roh),최광현(Kwang Hyeon Choi),김원국(Won Guk Kim),이원경(Won Kyung Lee),김도희(Do Hee Kim),양국현(Kuk Hyeon Yang) 한국세라믹학회 2018 세라미스트 Vol.21 No.4
In this study, the aspherical lens for optical communications produced not with an one-step pneumatic type of external pressurization system (existed GMP process) but a constant weight of self-loaded mold put up to upper core. So the lens is molding with self-loaded weight molding and it calls Weight Molding process. In self-loaded molding process, we measured changes of center thickness molding lenses with each variable molding temperatures and time to find the effect of center of lens thickness to search key factors. As experimental results, the center thickness reach to targeted lenses step time value was changed drastically and it depends by molding temperature. If the molding temperature gets higher, the targeted lens that is reaching to the center thickness step time value was decreased. To find the effect of life improvement on mold core by imposing the self-loaded molding process we molded with GMP(Glass molding press) method and self-loaded molding method for 9,000 times and measured the lenses shape accuracy and surface roughness to evaluate the core life. As a result the self-loaded molding method core has 2,000 times longer that GMP (Glass molding press) method. If we adopt self-loaded molding method of the optical aspherical lens molding in the future, we expect that it would reduce the expense of changing the molds by molding core life improvements.
간동맥화학색전술 후 발생한 기종성 담낭염 및 담도 기종 1예
이승훈 ( Seung Hoon Lee ),이재광 ( Jae Kwang Lee ),박도현 ( Do Hyun Park ),진영주 ( Young Joo Jin ),심주현 ( Ju Hyun Shim ),최광현 ( Gwang Hyeon Choi ),윤다림 ( Da Lim Yoon ) 대한내과학회 2012 대한내과학회지 Vol.83 No.6
Transarterial chemoembolization (TACE) is reportedly a useful palliative treatment in patients with unresectable or recurred hepatocellular carcinoma. Post-TACE complications are common; however, acute cholecystitis after TACE is rare. We herein report a case of a 73-year-old woman who presented with emphysematous cholecystitis and pneumobilia following TACE. Computed tomography performed for evaluation of her tumor status before TACE incidentally showed gallbladder and common bile duct stones. After TACE, she complained of severe epigastric pain with a positive Murphy`s sign. Computed tomography showed emphysematous cholecystitis and pneumobilia. She was successfully treated with emergent biliary stone removal by endoscopic retrograde cholangiopancreatography. (Korean J Med 2012;83:764-770)