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곽윤철,조주익,신기석,박은석,함현식 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-
Abstract - Removable protective adhesives for automobiles were synthesized by the emulsion polymerization of monomers, such as n-butyl acrylate(BA), n-butyl methacrylate(BMA), acrylonitrile(AN), acrylic acid(AA) and 2-hydroxyethyl methacrylate(2-HEMA), in which AA and 2-HEMA were functional monomers. Emulsion polymerization was conducted with a semi-batch type reactor. Tensile strength, extension, peel strength, viscosity and solid content of the synthesized adhesives were measured. In addition, acid resistance, alkali resistance and smoke resistance were also examined. As a result, with 0,43 mol of BA, 0,57mol of AN and 0.14~0.21 mol of BMA, the tensile strength, extension and peel strength of the synthesized adhesives satisfied the standard of removable protective adhesives for automobiles.
심재주,신동호,최윤석,김정구,유승재 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.12
The corrosion behavior of copper in neutral aerated synthetic tap water was investigated using electrochemical methods, SEM and XPS. All potentiodynamic polarization curves showed active corrosion behavior, and the corrosion rate was more sensitive to flow velocity than Cl^(-) ion concentration and temperature. The result of potentiostatic test indicated that the current density decreased with increasing time regardless of Cl^(-) ion concentration and temperature in stagnant condition because copper compounds were formed uniformly on the surface. The EIS plot was changed from two time constants to three time constants with the formation of Cu₂O, and the charge transfer resistance (R_(ct)) was very large and increased with increasing immersion time. From all results, copper had good corrosion resistance in this potable water system.
Cr, Co, Cu, Ni와 Ca의 첨가에 따른 지하매설배관의 전기화학적 특성에 관한 연구
최윤석,신동호,심재주,김정구 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.1
Aqueous corrosion characteristics of low carbon steel with small amounts of Cr, Co, Cu, Ni and Ca, in synthetic groundwater was studied by electrochemical corrosion tests (potentiodynamic test and electrochemical impedance spectroscopy (EIS) measurements) and analytical techniques. Neither carbon steel nor newly alloyed steels showed passive behavior in this synthetic groundwater. Newly alloyed steels, containing Cr-Co, Cr-Cu-Ni and Cr-Cu-Ni-Ca showed higher corrosion resistance than carbon steel in the potentiodynamic tests. EIS measurements showed that the Nyquist plot presented two time constants. The high frequency resistance component (R_(rsut)) and low frequency resistance component (R_(et)) were affected by the alloying elements. The polarization resistance (RP= R_(et) +Ra) of steels could be clearly ranked as Cr-Cu-Ni-Ca steel >> Cr-Cu-Ni steel > Cr-Co steel > carbon steel. Results of surface analyses (XPS and EPMA) showed that Cr and Cu were concentrated in the inner region of rust. However, Co and Ni were uniformly distributed all over the rust layer. These alloying elements improved corrosion resistance of low alloy steel in synthetic groundwater. Especially, Cr-Cu-Ni-Ca steel had the lowest corrosion rate due to the inner rust film formation during the initial stage of corrosion, which suggested a potential for substituting carbon steel in soil environment (Received October 29, 2004)
인공 수돗물 분위기에서 저탄소강의 부식특성에 미치는 합금원소(Cr, Co, W, Cu, Ni, Ca)의 영향에 관한 연구
심재주,최윤석,김정구 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.9
This paper presents the corrosion behavior of the low alloy steel contained alloying elements such as Cr, Co, W, Cu, Ni and Ca in synthetic tap water using potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS), XPS and EPMA. Potentiodynamic poalrization curves indicated that all the specimens had active corrosion behavior. Corrosion rate tended to reduce as the result of the alloying. Also, EIS test results showed that the more the content of element, the larger the polarization resistance. It can be seen that these results were caused from the formation of a coherent, protective film contained alloying elements. Actually, XPS results showed that Cr, Cu, and Ca were formed as protective metal oxides at the surface of rust film under the stagnant condition. The results of EPMA indicated that Cr, Cu, and Ca were distributed densely at the inner layer of the rust film, while Co, W, and Ni were distributed at the whole layer under the flow condition. Consequently, alloying elements improved corrosion resistance of low alloy steel in synthetic tap water. Especially, Cr, Cu, Ni, and Ca-containing specimen had the lowest corrosion rate due to the inner rust film formation during the initial stage of corrosion, which suggested a potential substitute for carbon steel in potable water system.
인공 해수분위기에서 저탄소강의 부식특성에 미치는 합금원소 Cr, Co 및 W의 효과
심재주,유승재,최윤석,김정구,유장용 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.12
The aqueous corrosion characteristics of 1% Cr-steel alloyed with small amounts of Co and W, in synthetic seawater was studied by using immersion weight-loss tests, electrochemical corrosion tests (potentiodynamic test and electrochemical impedance spectroscopy (EIS) measurements) and analytical techniques. 1% Cr steels containing Co or W from 0.2 to 0.4 wt.% showed higher corrosion resistance than the 1% Cr steel in the immersion and potentiodynamic tests. EIS measurements showed that the Nyquist plot presented one time constant. Furthermore, the Co- and W-bearing steels present higher Rp values than the 1% Cr steel through all the test period. The better corrosion resistance of the Co-and W-bearing steels is attributed to protectiveness of the surface layer. The corrosion products were examined using electron probe microanalysis (EPMA) and X-ray photoelectron spectroscopy (XPS). The results of EPMA indicated that Cr was concentrated in the inner region of the rust layer, while Co and W were distributed all over the rust layer. XPS results showed that Co existed as a trivalent oxide in the rust layer and W in the rust appeared in the form of a WO₄ compound.
거대 긴장성 낭종으로 내원한 폐 Langerhans 세포 조직주증
양석철,손장원,윤호주,신동호,박성수,함시영,장세진,박용욱 한양대학교 의과대학 2000 한양의대 학술지 Vol.20 No.1
Pulmonary Langerhans cell histiocytosis is a hetergenous group of conditions of unknown etiology characterized by an abnormal proliferation of antigen presenting cell of bone marrow derivation known as Langerhans cells that invade and destroy distal bronchioles. The outcome is highly variable, ranging from rapid spontaneous resolution to irreversible respiratory failure. We describe a patient with biopsy-confirmed pulmonary Langerhans cell histiocytosis who presented with large tension cyst, treated with pneumothorax tube with Heimlich flutter valve.
정보통신시장에서 다양한 혁신상품 수용의도간 연관성에 관한 연구 : 컨버전스 서비스를 중심으로 Focused on Convergence Services
김용철,주영혁,윤석훤 정보통신정책학회 2005 정보통신정책연구 Vol.12 No.1
정보통신시장에서는 유무선통합, 통방융합 추세로 인해 다양한 혁신상품들이 출시되고 있다. 본 연구에서는 한 소비자가 갖고 있는 다양한 혁신상품의 수용의도를 파악하여, 특정 혁신상품의 수용의도에 다른 혁신상품의 수용의도가 미치는 영향을 파악하였다. 연구 결과, 통방융합 혁신상품의 수용의도에 유무선통합 혁신 상품의 수용의도가 영향을 미치는 것으로 나타났다. 이를 통해 혁신상품 목표고객 선정에 대한 전략적 시사점과 수용의도를 기반으로 한 소비자 혁신성 연구의 가능성이라는 이론적 시사점이 도출되었다. Recently, there have been so many innovative services introduced in information and communication market according to the development of ICT and the convergence of related industry. In this article, the authors examine the impact of adoptions of related innovative services on adoption of a innovative service in the view of adoption intention. Predictions are developed and tested using survey data(n=800) from professional marketing research firm. Result shows that adoption of each innovative service is significantly influenced by adoptions of other innovative services. This research has implication for targeting of innovative services strategically and measuring of consumer innovativeness practically.