http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
강성근,Youngrae Kim,김은경,김성동 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.1
The effects of heat treatment on room temperature ferromagnetism of Co-doped ZnO were investigated with a (ZnO 20Å/Co x Å)20 multilayer structure where x = 1.5, 3, 4.3, 6 and 9 Å. As the thickness of the Co sub-layer increased, the ZnO/Co multilayer changed its magnetic state from diamagnetism at Co 1.5 Å and 3 Å to weak ferromagnetism at Co 4.3 Å and strong ferromagnetism at Co 6 Å and 9 Å. The heat treatment,in a vacuum at 400°C, changed the diamagnetic property into a ferromagnetic one, resulting in room temperature ferromagnetism for all Co sub-layer thicknesses. The improvement in ferromagnetism could be ascribed to the exchange coupling between dispersed Co atoms through XRD, optical transmittance and TEM analysis.
강성근,방완근,이승헌,김창은 한국세라믹학회 1999 한국세라믹학회지 Vol.36 No.7
It is a fundamental experiment to use blast-furnace slag in solidification/stabilization process. The compressive strength and leaching test of Pb and Cr doped samples were evaluated and the effects of heavy-metal ions on the hydration of slag was investigated. Sodium silicates(5wt%) was added as alkali-activator and the effects of replacing a part of slag with flyash or gypsum was also discussed. Pb ion was solidified by encapsulation of matrix. In of slag${\pm}$gypsum binder microstructure was densified by accelerating to form AFt/AFm phase and compressive strength was improved resulting in reducing leaching amount of Pb ion. Cr ion was solidified by substituting with Al ion in aluminate product. Slag+fly ash binder improved compressive strength and decreased leaching amount of Cr ion.
방완근,김창은,강성근 연세대학교 산업기술연구소 1997 논문집 Vol.29 No.1
Iron-bearing cold bonded pellets using blast fumace slag with various activators were prepared and cured at different conditions. The specimens were evaluated by UTM analysis and compared with pellets using ordinary Portland cement. To clarify the hardening mechanism of slag binder, XRD, DTA, Calorimeter, SEM and other analyses were performed. Hydration product identifications and compressive strength measurement revealed that if activators and curing conditions were properly chosen, Cement can be replaced with slag binder in cold bonded pellet preparation.
(ZnO/Co) 다층 박막에서 ZnO층의 두께가 상온강자성 특성에 미치는 영향
강성근,김성동 한국마이크로전자및패키징학회 2018 마이크로전자 및 패키징학회지 Vol.25 No.4
Room temperature ferromagnetism of Co doped ZnO was studied using (ZnO/Co) multilayer structure, and the effects of ZnO sub-layer thickness on the RT ferromagnetism was investigated. As for the as-deposited state, the diamagnetism was observed for (ZnO 20Å/Co xÅ) while the ferromagnetism was observed for (ZnO 40Å/Co xÅ). After vacuum-annealed, both showed the RT ferromagnetism and (ZnO 40Å/Co xÅ) structure interestingly showed negative remanence magnetization behavior. UV-Vis spectrometer revealed that Co atoms were substituted with Zn in ZnO and Co cluster was not found in XPS and HRTEM EDS analysis. (ZnO/Co) 다층박막 구조를 이용하여 Co 도핑한 ZnO의 상온강자성 특성을 조사하였으며, 특히 ZnO 박막층의 두께가 (ZnO/Co) 다층박막의 상온강자성 특성에 미치는 영향을 조사하였다. ZnO 박막층의 두께가 20Å, 40Å일 때 증착상태에서는 각각 반자성과 강자성 특성을 나타내었으며 진공열처리 후에는 모두 강자성 특성을 나타내었다. 특히(ZnO 40Å/Co xÅ)는 열처리 후에 음의 잔류자화 거동을 나타내었다. UV-Vis 분석을 통해서 Co 일부가 Zn와 치환되어위치하고 있음을 확인할 수 있었으며, 열처리 전후에 대한 XPS 및 HRTEM EDS 분석에서 Co 클러스터의 형성은 관찰되지 않았다.
적과시기 및 방법이 온주밀감의 수량 및 과실품질에 미치는 영향
韓海龍,姜宗勳,姜聖根 濟州大學校亞熱帶農業硏究所 1997 亞熱帶農業硏究 Vol.14 No.-
This experiment aimed to establish adequate fruit thinning techniques by comparing and investigating fruit productivity and changes of fruit quality with thinning times and thinning methods. Satsuma mandarin(Citrus unshiua Marc.) cv. ‘Miyagawa Early was used and treatments were 11, the alternate whole branch fruit(buds) thinning(AWFBT), the partially whole tree fruit thinning(PWTFT) and the foliar spray of the chemical fruit thinning agent(FSCFTA:ethychlozate) etc. from the middle of June to early in Sept. The results were as follows ; Ⅰ. The earlier fruit-thinning times was, the higher the ratio of marketable fruit yield was, and the AWTFT and PWTFT in the middle of May, the FSCFTA and PWTFT in June were effective to increase the ratio of marketable yield in this order 2. Thinning of bud in the middle of May required about 50min. to eliminate buds from a tree, it's a big problem. In contrast, FSCFTA(ethycholzate 50mg/l + ethrel 20mg/l) required 3.1min, the shortest working hours for getting rid of buds and the AWFBT was more effective than the PWTFT because of saving the labor efforts to pick and thin fruit. 3. Thinning and FSCFTA methods could be able to harvest fruit earlier and also was good in rind color, but soluble solid and juice sac thickness which indicate the interior quality were not significant. It was thought that this is because leaf-fruit ratio at the harvesting time due to fruit thinning and FSCFTA treatments was less than 25. But in case of sugar-acid ratio, that of the AWFBT treatments showed a little more increse than that of the PWTFT. 4. The number of fruit set in following year was much more in earlier fruit thinning treatments and the AWFBT than in late thinning and PWTFT treatments, respectively. 5. From these results, it was considered that the tree bearing too many flowers in more effective to put the AWFBT at least by the end of June for increse of the ratio of marketable fruit yield, quality fruit and the prevention of the alternate bearing.
강성근,김성동 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
In order to develop electrochemical deposition machine, we investigated the effects of some key design factors on the electrochemical deposition process, for example, current density, electrode agitating and electrochemical solution circulation. Deposition rate is increased with the current density and circulation. Thickness uniformity shows rather complex behavior, that is, it is improved with slow circulation at 0.03 A/㎠ current density while at 0.04 A/㎠, faster circulation shows better thickness uniformity.