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Pak, Chang Sik,Chang, Lan Sook,Lee, Hobin,Jeong, Jae Hoon,Jeong, Jinwook,Yoon, Eul-Sik,Heo, Chan Yeong Korean Society of Plastic and Reconstructive Surge 2015 Archives of Plastic Surgery Vol.42 No.5
Background Facial rejuvenation can be achieved using a variety of techniques. Since minimally invasive procedures for face lifting have become popular because of their convenience and short operating time, numerous minimally invasive surgical procedures have been developed. In this study, a nonabsorbable polypropylene mesh is introduced as a new face lifting instrument, with the nasolabial fold as the main target area. In this paper, we report the efficacy and safety of a polypropylene mesh in midface rejuvenation. Methods Thirty-three subjects with moderate-to-severe nasolabial folds were enrolled from two medical institutions for a noncomparative single-sample study. A mesh was inserted above the superficial muscular aponeurotic system layer, reaching the nasolabial folds through a temporal scalp incision. After 3 weeks, the temporal end of the mesh was pulled to provide a lifting effect. Then, the mesh was fixed to the deep temporal fascia using nonabsorbable sutures. To evaluate efficacy, we compared the scores on the Wrinkle Severity Rating Scale and a visual analog scale for patient satisfaction between the baseline and 7 weeks postoperatively. In addition, we evaluated safety based on the incidence of adverse events. Results The treatment was deemed effective at improving wrinkles in 23 of 28 cases, and patient satisfaction improved significantly during the study period. There were seven cases of skin or subcutaneous tissue complications, including edema and erythema, but there were no suspected serious adverse events. Conclusions Face lifting using a nonabsorbable mesh can improve nasolabial folds without serious adverse effects. Thus, this technique is safe and effective for midface rejuvenation.
Simplified Ground-type Single-plate Electrowetting Device for Droplet Transport
Chang, Jong-Hyeon,Kim, Dong-Sik,Pak, James Jung-Ho The Korean Institute of Electrical Engineers 2011 Journal of Electrical Engineering & Technology Vol.6 No.3
The current paper describes a simpler ground-type, single-plate electrowetting configuration for droplet transport in digital microfluidics without performance degradation. The simplified fabrication process is achieved with two photolithography steps. The first step simultaneously patterns both a control electrode array and a reference electrode on a substrate. The second step patterns a dielectric layer at the top to expose the reference electrode for grounding the liquid droplet. In the experiment, a $5{\mu}m$ thick photo-imageable polyimide, with a 3.3 dielectric constant, is used as the dielectric layer. A 10 nm Teflon-AF is coated to obtain a hydrophobic surface with a high water advancing angle of $116^{\circ}$ and a small contact angle hysteresis of $5^{\circ}$. The droplet movement of 1 mM methylene blue on this simplified device is successfully demonstrated at control voltages above the required 45 V to overcome the contact angle hysteresis.
Simplified Ground-type Single-plate Electrowetting Device for Droplet Transport
Jong-Hyeon Chang,Dong-Sik Kim,James Jungho Pak 대한전기학회 2011 Journal of Electrical Engineering & Technology Vol.6 No.3
The current paper describes a simpler ground-type, single-plate electrowetting configuration for droplet transport in digital microfluidics without performance degradation. The simplified fabrication process is achieved with two photolithography steps. The first step simultaneously patterns both a control electrode array and a reference electrode on a substrate. The second step patterns a dielectric layer at the top to expose the reference electrode for grounding the liquid droplet. In the experiment, a 5 ㎛ thick photo-imageable polyimide, with a 3.3 dielectric constant, is used as the dielectric layer. A 10 ㎚ Teflon-AF is coated to obtain a hydrophobic surface with a high water advancing angle of 116° and a small contact angle hysteresis of 5°. The droplet movement of 1 mM methylene blue on this simplified device is successfully demonstrated at control voltages above the required 45 V to overcome the contact angle hysteresis.
김정식,김동희,이창희,윤의박,임성철 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.4
Experiments were performed by thermogravimetric(TG) technique for A356.2(Al-7Si-0.4Mg) aluminum alloy containing 0.4wt%Mg to examine the effect of magnesium on the oxidation kinetics in dry and moist air over the temperature range of 200∼550℃. The results of TG analysis showed that oxidation in moist air was much faster than in dry air at high temperatures above 525℃ while oxidation in both dry and moist air below 200℃ was stagnant. For the surface analysis of oxidation, the results of Auger electron spectroscopy(AES), X-ray diffraction patterns(XRD), analysis showed that only aluminum oxide was formed at relatively low temperature of 300℃ while the duplex film structure of Mg oxide/Al oxide/matrix was formed at high temperature of 550℃. MgO was a major constituent on the surface of oxide film, but the relative concentration of MgO decreased with increasing depth, while that of spinel, MgAl₂O₃ increased.
DirectShow를 이용한 디지털 오디오 효과 필터의 개발
박세형(Se-Hyoung Pak),구덕회(Duk-hoi Koo),신재호(Jaeho Shin),김영식(Yung-sik Kim),장덕호(Duk-ho Chang) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ
본 논문에서는 멀티미디어 스트림을 제어하는 표준으로 Microsoft사에서 제안한 DirectShow의 특성을 살펴보고, 디지털 오디오 효과 필터 5가지에 대한 요소를 분석하며, 분석한 자료를 토대로 파라미터 및 기본 기능을 설계한다. 이러한 설계를 바탕으로 DirectShow를 이용하여 디지털 오디오 효과 필터를 구현한다. DirectShow는 윈도 95와 윈도 NT 기반의 멀티미디어 스트림 제어를 COM으로 구현할 수 있게 한다. 따라서 구현되는 필터는 독립된 이진 파일로 만들어지며, 이러한 필터는 필터 그래프 방식을 통해 다양한 특수 효과 필터의 삽입, 삭제, 변경 등이 용이하게 된다. 이 논문에서는 구현한 오디오 효과 필터 5가지는 오디오의 기본적인 특성을 이용하는 필터로서 오디오 필터 구현을 위한 핵심 기술이 많이 이용된 필터라고 할 수 있다.
LED와 CMOS 이미지 센서 기반 간 기능 분석용 소형 광학장치
김철(Chul Kim),임창진(Chang-Jin Lim),남명현(Myung-Hyun Nam),김동식(Dong-Sik Kim),서성규(Sungkyu Seo),박정호(Jungho Pak) 대한전기학회 2012 전기학회논문지 Vol.61 No.2
This paper presents a portable and compact optical device which can conveniently be used to perform a functional analysis of human liver function. The proposed system employed red/green LEDs, as a light source, and CMOS image sensor, which is commonly used in cellular phones. With this system, several blood serum samples have been evaluated for liver functional analysis by measuring light absorption level through the blood serum samples depending on aspartate aminotransferase (AST), alanine aminotransferase (ALT), and total bilirubin concentration. The light absorption through the blood serum samples containing AST, ALT, or total bilirubin can provide their concentrations. The green light absorption is more sensitive to the concentration of AST or ALT, and the red light absorption is more sensitive to the total bilirubuin concentration. Additional calibration steps were performed by using a MATLAB program in order to eliminate the light scattering effects from the extraneous particles existing in each blood serum sample. From the blind test, three standard light intensity curves through each enzyme have been obtained and the enzyme concentration values have been compared to those obtained from a commercially available biochemistry analyzer (Toshiba 200 FR). The average percent difference in the obtained concentrations from two systems for AST, ALT, and total bilirubin concentration came out to be 7.79%, 7.98%. and 7.56%, respectively, with the adjusted coefficient of determination (R2) higher than 0.98. This system can possibly lead to a low-cost and simple system that can be used as a point-of-care (POC) system in a condition without advanced equipments.