http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
리튬/공기 이차전지용 카본미소구체/Fe<sub>3</sub>O<sub>4</sub> 나노복합체
박창성,박용준,Park, Chang Sung,Park, Yong Joon 한국전기화학회 2014 한국전기화학회지 Vol.17 No.2
본 논문에서는 리튬/공기 이차전지의 공기전극에 사용될 수 있는 카본미소구체/$Fe_3O_4$ 나노복합체의 합성과 전기화학적 특성에 대해 보고하고 있다. 산화물 촉매 중 하나인 $Fe_3O_4$의 부족한 전도성을 보완하기 위해 카본미소구체와 복합화를 시도하였고 그 결과 카본미소구체 표면에 수 nm 크기의 $Fe_3O_4$를 균일하게 분산시켜 복합화 할 수 있었다. 이와 같이 미세하게 분산된 산화물 촉매와 카본과의 결합은 촉매의 비표면적을 넓히고 카본과 촉매와의 접촉면을 넓혀 전도성을 높임으로서 높은 촉매 활성을 기대할 수 있다. 카본미소구체/$Fe_3O_4$ 나노복합체를 이용하여 만든 전극은 카본미소구체를 사용한 전극에 비해 낮은 과전압과 상대적으로 안정한 사이클 특성을 관찰할 수 있었다. In this article, we report the fabrication and characterization of carbon sphere/$Fe_3O_4$ nanocomposite for Li/air batteries. $Fe_3O_4$ nanoparticles are dispersed homogeneously on the surface of carbon spheres in an attempt to enhance the low conductivity of oxide catalyst ($Fe_3O_4$). The carbon sphere/$Fe_3O_4$ nanocomposite could offer wide surface area of $Fe_3O_4$ and increased carbon/catalyst contact area, which lead to enhanced catalytic activity. The electrode employing carbon sphere/$Fe_3O_4$ nanocomposite presented relatively low overpotential and stable cyclic performance compared with the electrode employing carbon sphere.
중학생들이 선호하는 여가활동의 유형에 따른 안전도 및 만족도의 실태
박창성,정순광 한국안전교육학회 2002 한국안전교육학회지 Vol.5 No.1
The purpose of this study is to search for the safety and satisfaction of amusement facilities and instruments according the types of recreation activities of middle school students. As the subject of this study, the population of middle school students in Seoul as of 2002 was selected, and as final sample, 203 of total 250 persons sampled using the Stratified cluster random sampling method was taken. The questionnaire of this research was prepared using that of Hwang, Seon-yeong (1987), and it was composed of 24 items as to 2 for personal characteristics, 2 for recreation activities, 5 for preferred facilities and amusement kinds and 7 for safety degree, and 7 for satisfaction degree. The questionnaire survey was conducted by the Self-administration method at the middle schools in Seoul from Dec. 1 till Dec. 20, 2001. The collected data was analyzed using the Windows SPSS/PC PC 10.0, and the average and standard deviation by each sub-factor was calculated. And safety state and satisfaction by the middle school students' individual characteristics was post-verified through the one-way ANOVA and Scheffe. Finally, safety state and satisfaction by the types of the middle school students' recreation activities was post-verified through the one-way ANOVA and Scheffe, The findings obtained based on the results of the above procedures and data analysis are as follows. 1) For safety according to the middle school students' demographic characteristics, there is no difference by gender, school year and injury experience. 2) For satisfaction according to the middle school students' demographic characteristics, there is no difference by gender, school year and difference by injury experience. 3) For injury state according to the middle school students' demographic characteristics, there is no difference by gender, but difference by school year. 4) For safety according to the types of middle school students' recreation activities, there is no difference by activity types, items of preferred events. 5) For satisfaction according to the types of middle school students' recreation activities, there is no difference by activity types, items of preferred events. 6) For injury state according to the types of middle school students' recreation activities, there is no difference by injury parts and sites.
일반 측방 두부규격 방사선사진과 측방 추부규격 전산화 방사선사진에서의 계측점의 신뢰도에 대한 비교 연구
김형돈,김기덕,박창성,Kim Hyung-Don,Kim Kee-Deog,Park Chang-Seo 대한영상치의학회 1997 Imaging Science in Dentistry Vol.27 No.1
The purpose of this study was to compare & to find out the variability of head film measurements (and marks identification) between Fuji computed radiographic cephalometry and conventional cephalometry. 28 Korean adults were selected. Lateral cephalometric FCR film and conventional cephalometric film of each subject was taken. Four investigators identified 24 cephalometric landmarks on lateral cephalometric FCR film and conventional cephalometric film. The comparable measurements between lateral cephalometric FCR film and conventional cephalometric film were statistically analysed. The results were as follows : 1. In FCR film & conventional film, coefficient of variation (C.V.) of 24 landmarks was taken horizonta1ly & vertically. There is no significant difference of rank order of landmarks in C.V. between two films. 2. In comparison of significant differences of landmarks variability between FCR film & conventional film, horizontal value of coefficient of variation, showed significant differences in four landmarks among twenty-four landmarks, but vertical value of coefficient of variation showed significant differences in sixteen landmarks among twenty-four landmarks. FCR film showed significantly less variability than conventional film in 17 subjects among 20(4+16) subjects that showed significant difference.
김영재,유영석,심원철,박창성,정재우,오용수 대한전기학회 2006 전기학회논문지C Vol.55 No.8(C)
- This paper presents the effect of driving waveform for piezoelectric bend mode inkjet printhead with optimized mechanical design. Experimental and theoretical studies on the applied driving waveform versus jetting characteristics were performed. The inkjet head has been designed to maximize the droplet velocity, minimize voltage response of the actuator and optimize the firing frequency to eject ink droplet. The head design was carried out by using mechanical simulation. The printhead has been fabricated with Si(100) and SOI wafers by MEMS process and silicon direct bonding method. To investigate how performance of the piezoelectric ceramic actuator influences on droplet diameter and droplet velocity, the method of stroboscopy was used. Also we observed the movement characteristics of PZT actuator with LDV(Laser Doppler Vibrometer) system, oscilloscope and dynamic signal analyzer. Missing nozzles caused by bubbles in chamber were monitored by their resonance frequency. Using the water based ink of viscosity of 4.8 cps and surface tension of 0.025 N/m, it is possible to eject stable droplets up to 20 kHz, 4.4 m/s and above 8 pl at the different applied driving waveforms.
金永財(Youngjae Kim),劉永錫(Youngseuck Yoo),沈原徹(Wonchul Sim),朴敞聖(Changsung Park),鄭在祐(Jaewoo Joung),吳龍洙(Yongsoo Oh) 대한전기학회 2006 전기학회논문지C Vol.55 No.8
This paper presents the effect of driving waveform for piezoelectric bend mode inkjet printhead with optimized mechanical design. Experimental and theoretical studies on the applied driving waveform versus jetting characteristics were performed. The inkjet head has been designed to maximize the droplet velocity, minimize voltage response of the actuator and optimize the firing frequency to eject ink droplet. The head design was carried out by using mechanical simulation. The printhead has been fabricated with Si(100) and SOI wafers by MEMS process and silicon direct bonding method. To investigate how performance of the piezoelectric ceramic actuator influences on droplet diameter and droplet velocity, the method of stroboscopy was used. Also we observed the movement characteristics of PZT actuator with LDV(Laser Doppler Vibrometer) system, oscilloscope and dynamic signal analyzer. Missing nozzles caused by bubbles in chamber were monitored by their resonance frequency. Using the water based ink of viscosity of 4.8 cps and surface tension of 0.025 N/m, it is possible to eject stable droplets up to 20 ㎑, 4.4 ㎧ and above 8 pl at the different applied driving waveforms.
김성진 ( Sung Chin Kim ),윤홍진 ( Hong Chin Yun ),박창성 ( Chang Sung Park ),육순재 ( Soon Jae Yuk ),오정환 ( Chung Whan Oh ) 대한내과학회 1972 대한내과학회지 Vol.15 No.5
This report describes a 40 year old male patient of tophaceous gout with renal failure. Serum uric acid was found to be the range from 8. 3 to 9. 3mg/100ml. Mlultiple tophi were found on the both ears and about the metatarsophalangeal joints of the great t