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열분해 공정을 통해 합성된 산화 코발트 나노입자의 리튬 전기화학반응성
진연호,심현우,김동완,Jin, Yun-Ho,Shim, Hyun-Woo,Kim, Dong-Wan 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.6
Nano-sized cobalt (II) oxide nanoparticles with a high crystallinity were synthesized using thermolysis of a $Co^{2+}$-oleate precursor at 310$^{\circ}C$. The phase and morphology of as-prepared cobalt oxide nanoparticles were characterized using X-ray diffraction, high-resolution transmission electron microscopy, and Brunauer-Emmett-Teller surface area measurements. The cobalt oxide nanoparticles were found to be spherical nanoclusters with an average diameter of approximately 200 nm, consisting of tiny nanocrystals (10-20 nm). Furthermore, the Li electroactivites of the cobalt oxide nanoparticles were investigated using cyclic voltammetry and galvanostatic cycling. The cobalt oxide nanoparticles could deliver high capacities over 420 mA h $g^{-1}$ at a C/5 current rate.
진연호,장대환,정항철,이기웅,Jin, Y.H.,Jang, D.H.,Jung, H.C.,Lee, K.W. 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.2
Fundamental experiences have been studied for development of pre-treatment process of Sn by-products such as solders. Dry and wet separation/recovery processes were considered by the differences of physical properties. The by-products, which are analyzed by solder metal and oxides. The metal and oxide were simply separated by dry ball-milling process for 12 hours, after that recovery metal powder might be reusable as lead or lead-free solders. In terms of wet separation process, samples were dissolved in $HNO_3+H_2O_2$ and the precipitation were analyzed by $SnO_2$. Overall efficiency of recovery might be increasing via developing simple pre-treatment process.
비정질 실리콘 산화물을 이용한 리튬망간실리콘산화물의 합성 및 전기화학적 특성 평가
진연호,이근재,강이승,정항철,홍현선,Jin, Yun-Ho,Lee, Kun-Jae,Kang, Lee-Seung,Jung, Hang-Chul,Hong, Hyun-Seon 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.3
Mass production-capable $Li_2MnSiO_4$ powder was synthesized for use as cathode material in state-of-the-art lithium-ion batteries. These batteries are main powder sources for high tech-end digital electronic equipments and electric vehicles in the near future and they must possess high specific capacity and durable charge-discharge characteristics. Amorphous silicone was quite superior to crystalline one as starting material to fabricate silicone oxide with high reactivity between precursors of sol-gel type reaction intermediates. The amorphous silicone starting material also has beneficial effect of efficiently controlling secondary phases, most notably $Li_xSiO_x$. Lastly, carbon was coated on $Li_2MnSiO_4$ powders by using sucrose to afford some improved electrical conductivity. The carbon-coated $Li_2MnSiO_4$ cathode material was further characterized using SEM, XRD, and galvanostatic charge/discharge test method for morphological and electrochemical examinations. Coin cell was subject to 1.5-4.8 V at C/20, where 74 mAh/g was observed during primary discharge cycle.
기술사레 : 국내 광산 기술을 적용한 카자흐스탄 광산 발파설계 제안
진연호 ( Yeon Ho Jin ),민형동 ( Hyung Dong Min ),정민수 ( Min Su Jeong ),박윤석 ( Yoon Suk Park ),허의행 ( Eui Haeng Heo ),( Murod Nurmatov ) 대한화약발파공학회 2014 화약발파 Vol.32 No.1
본 연구에서는 중앙아시아에 위치한 카자흐스탄을 방문하여 Kazakhmys광산을 소개하고 국내 발파 기술을 접목할 경우를 가정하여 최적의 발파 설계를 제안하고자 한다. 그 결과, 국내 발파 기술을 사용하더라도 카자흐스탄 광산에서 발생하는 화약 소모량과 천공수 등을 절감하여 최종적인 생산원가를 절감할 수 있는 발파 설계가 가능한 것을 알 수 있었다. In this study, the information achieved from the visit to Kazakhmys mine in Kazakhstan was introduced. An optimal blasting pattern designed for the mine with the application of Korean blast technology was suggested. As a result, it was found that the blast design can reduce the consumption of explosives and the number of drill holes. The blast design can reduce the overall production cost in the mine.
진연호,노영태 釜山大學校 附設 體育科學硏究所 1994 體育科學硏究所 論文集 Vol.10 No.-
The purpose if this study was to compare and analyze the physical fitness of the different sport groups in high school athletes. The subjects were 120 athletes in P high school of Physical education. The results of measurement on six factors and twelve items, the conclusions were as follows: 1. In the factor of strength, the best performed athlete groups were ju do, sprinter, and weight lifting, on the other hand, the worst were tae kwon do, long distance runner, and boxing. In the item of back strength, between the athlete groups of weight lifting and tea kwon do were shown a significant difference at the level of 5%. 2. In the factor of muscular endurance, the best performed athlete group was gymnastics, on the other hand, the worst was tae kwon do. In the item of pull-up, between the gymnastics group and the other group were significant difference at the level of 5%. 3. In the factor of power, while the best performed athlete groups were sprinter, weight lifting, and gymnastics, the worst were ju do, boxing, and archery. The athlete groups of between sprinter and weight lifting were shown a significant difference at the level of 5%. 4. In the factor of agility, the best performed athlete groups were sprinter and boxing, on the other hand, the worst were ju do, archery, and shooting. Between the athlete groups of sprinter and ju do were shown a significant difference at the level of 5%. 5. In the factor of flexibility, the best performed athlete groups were gymnastics and shooting, on the other hand, the worst were boxing and archery. And there was a significant difference between gymnastics and other athlete group at the level of 5%. 6. In the factor of balancer, while the best performed athlete group was gymnastics, the worst were ju do. But, among the athlete groups, a significant difference was not shown.
알루미늄 7075 합금의 PEO 처리 기술 및 첨가제 영향 분석
진연호(Yun-Ho Jin),양재교(Jae-Kyo Yang) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.2
In this study, we developed plasma electrolytic oxidation (PEO) process for aluminum 7075 alloy to improve the corrosion and mechanical properties. The electrolyte consists of potassium hydroxide and sodium silicate. Additionally, sodium stannate was added into the electrolyte to investigate its effect on PEO film formation. Titanium was used as the counter electrode. Plasma generation voltage reduced from 300V to 150 V by adding 4 g/L of sodium stannate. The thin oxide films were observed by SEM(Scanning Electron Microscopy)/ EDS (Energy Dispersive Spectroscopy) for quantitative and qualitative analyses. XRD (X-ray diffraction) and XRF (X-ray Fluorescences) analyses were also carried out to identify oxide layer on aluminum 7075 surface. Vicker’s hardness test was performed on the PEO-treated aluminum 7075 surface.
진연호(Yeon-Ho Jin),김은경(Eun-Kyung Kim),정병수(Byeong-Soo Jeong) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.2Ⅲ
최근의 네트웍 환경에서는 멀티미디어 서비스와 대용량의 파일을 이용하는 어플리케이션의 증가로 인해 이를 충족시킬 수 있는 저장 장치가 요구되고 있는 실정이며 이러한 저장 장치를 이용한 분산 환경의 네트웍 파일 시스템이 필수적이 되었다. 실제로 ATM, Fast switched LAN, Fibre channel 같은 고속의 네트웍 발달로 인해 분산 환경의 네트웍 파일 시스템에서 디스크를 액세스하는 속도보다 오히려 네트웍으로 연결된 원격지의 메모리를 액세스하는 것이 더 빨라졌다. 따라서 지역 디스크 캐싱 기법이 분산 환경의 네트웍 저장 시스템으로 적용되면서 전역적 메모리를 관리하는 것과 원격지간의 캐시 일관성 문제(cache consistency)를 고려하지 않을 수 없게 되었다. 본 노문에서는 분산 환경의 캐싱 기법을 살펴보고 전역적 메모리의 캐시 일관성 문제를 다루면서 이에 대한 설계방안 및 앞으로의 연구 방향을 제시한다.