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- 저자 : 曺正煥 (검색결과 506 건)
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선행운동의 負荷强度와 休息程度가 하바드스텝 側定結果에 미치는 영향
姜相兆,申範澈,曺正煥 韓國體育大學校附屬 體育科學硏究所 1984 韓國體育大學校附屬 體育科學硏究所論文集 Vol.3 No.1
The purpose of this study was yo investigate the effect of prior exercise resistance and rest perriod on Harvard Step Test. Male subjects(n=10) aged 19-23 performed prior exercise consisting of sit-ups(2min) and 1,000m run. After the prior exercise, the subjects rested for 3min, 5min,10min before staring Harvard Step Test. It was hypothesized that subjects demonstrate different performances in prior exercise, rest period on Harvard Step Test. The study design was a 2-way (prior exercise ×rest period) factorial ANOVA with repeated measures on assigned factors. The levels of assigned factors were: Prior exercise resistance and rest Period. The dependent variables was Harvard Step Test index. Statistical significant differences at the 0.5 level were found between the overall mean of the resistance level of two prior exercise, but were found between the overall means of the three rest period level. A significant interaction among prior exercise resistance level and rest period level was not found. It was concluded that the releabilitv the Harvard Step Test as physical fitness test is assured if subjects take at least 3min rest period after prior exercise of sit-ups and 1.000m run. It is necessary to standerdize the testing procedures of prior exercise in a great detail when administring Harvard Step Test.
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내식성 첨가물질로서 폴리아날린/금속(산화물) 복합체의 제조
조정환,오영주,최영주 고신대학교 자연과학연구소 2007 고신대학교 자연과학연구소 논문집 Vol.14 No.-
폴리아닐린 합성에는 아닐린 단량체에 파라-툴루엔설폰산(ρ-TSA)과 같은 유기도판트를 사용하였으며, 복합체 제조에는 산화알루미늄, 산화마그네슘 등의 금속 산화물이나 나노사이즈의 아연 분말을 사용하였다. 이렇게 제조한 복합체를 다양한 조성으로 수분산 바인더에 첨가하여 내식성 코팅 물질을 제조하였다. Aniline monomers and ρ-toluenesulfonic acid as a dopant were used to synthesize polyanilines, and metal oxides such as Aluminum oxides, Magnesium oxides, and metal powders such as Zinc and Aluminium were used to prepare polyaniline/metal(oxides) complexes. The coating materials for corrosion protection of metals were prepared by adding the complexes of various ratios into a water soluble binder.
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MECHANICAL ALLOYING 법에 의한 ZrO₂/NiCrAlY 용사용 복합분말의 제조에 관한 연구
한주철,송요승,이구현,노병호,박만호,조정환 한국항공대학교 1996 論文集 Vol.34 No.-
ZrO₂경사기능성 Thermal Barrier Coating(TBC) 내 중간 복합층의 물성을 개선하고자, Mechanical Alloying (이하 M.A.)법에 의해 Y₂O₃ stabilized ZrO₂(이하 YSZ)와 MgO stabilized ZrO₂(이하 MSZ), 그리고 NiCrAlY의 복합분말을 제조하였다. 300시간 M.A. 결과, YSZ/NiCrAly, MSZ/NiCrAlY 모두 유사한 거동을 나타내었다. XRD Peak Broadening은 일어났지만 Shifting은 발생하지않았다. 개개 분말은 NiCrAly 기지에 미세한 YSZ 혹은 MSZ Particle이 분산되어 박혀 있는 판상의 단면형상을 보인다. 분말 크기가 5∼50㎛로 불균질한 양상을 보여 분말의 송급성에 지장을 주리라 사료된다.
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TD PROCESS에 의한 VC coating층의 물성에 관한 연구
한주철,송요승,노병호,이구현,박만호,조정환 한국항공대학교 1996 論文集 Vol.34 No.-
The influence of the composition of the molten salt bath, the kind of steel, and the treat time in coating STD11(1.5% C)/STD61(0.4% C) with VC by TD process was clarified. And then wear test, hardness test were made for VC coated STD11/STD61 and hardend STD11/STD61 which were quenched and tempered, in order to observe the properties of VC coated layer and the effects of TD process. The results obtained are as follows. The thickness of VC coated layer was increased with increasing ?? content in molten salt bath, C content in steels, and the treating time. After TD process and tempering, the second layer which consist of the oxide and the remaining salt was on VC layer. The wear loss of VC coated STD11/STD61 were much lessened.
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투자대상국의 특허권 보호 정도가 우리나라 해외직접투자에 미치는 영향
조정환 한국지식재산연구원 2013 지식재산연구 Vol.8 No.4
This study investigates the effects of the patent rights protection inhost countries on outward foreign direct investment from Korea. Theexisting papers which considered the R&D intensity as technologicaladvantages explicitly did not consider the patent right regimes in hostcountries in explaining the motives of outward foreign direct investmentof Korea. To fill this gap, this paper is designed to provide whether ornot there exists the effects of patent rights protection of host countrieson Korean outward foreign direct investment. Using the data of 23 manufacturing sectors from 2007 to 2011 bygravity model it was found that stringent patent regimes have thenegative impacts on Korean outward foreign direct investment. Theresult shows that strong patent rights could increase the operating costsdue to the legal dispute regarding the infringement of patent. However,the paper found that for technology intensive sectors there exists thepositive relationship between the strong patent rights in host countriesand Korean foreign direct investment outflows. This result reveals thatthe stringent patent rights are more likely to contribute to increase theoutflows of Korean foreign direct investment in the high technologymanufacturing sectors. Therefore, we found that the patent protection regimes can beconsidered as one of the determinants of outward foreign directinvestment in manufacturing industries and, especially, technology intensive sectors. 본 논문은 투자대상국의 특허권 보호 정도가 우리나라 해외직접투자에 미치는 영향을 실증분석 하였다. 2007년부터 2011년까지 23개 제조업의 해외직접투자 자료를 이용하여 중력모형을 통해 분석한 결과, 투자대상국의 특허권 보호 정도가 강할수록 우리나라 해외직접투자에 부정적인 영향을 미치는 것으로 나타났다. 즉, 투자대상국의 특허권 보호가 강화될수록 특허권과 관련된 각종 소송비용과 영업비용이 증가하여 우리나라 해외직접투자는 감소할 가능성이 있다는사실을 나타낸다. 그러나 기술집약적인 산업의 경우 투자대상국의 특허권 보호강화는 해외직접투자를 증가시킬 수 있는 것으로 나타났다. 이러한 결과는 투자대상국의 특허권 보호 체계가 제조업 및 기술집약적 산업에 대한 해외직접투자의결정요인으로서 고려될 수 있음을 의미한다.
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Effect of load and thickness on the constrained sintering of LTCC substrates
조정환,여동훈,신효순,홍연우,남산 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.5
It is necessary to develop the technique of high integrity ceramic modules with fine patterning, via hole minimizing, and via hole aligning between the layers. The shrinkage of ceramic bodies during sintering reduces the precision of patterns, via-hole alignments, and the large formatting of the substrates. Therefore the importance of shrinkage control of ceramic substrates during sintering is being increased for fabricating high integration modules using the large and flat multilayer ceramic substrates. In this study, the x-y shrinkage of LTCC substrates was controlled to under 0.2% using alumina sacrificial layers by less-pressure assisted sintering. The laminated sheets of alumina/LTCC/alumina were sintered at 900 oC for 30 minutes in air according to a specified sintering profile. Samples with different thicknesses of LTCC sheet and the alumina layer were sintered and the sintering shrinkage of the x-y and z axis were compared with the radius of edge curvature of them. Also the radii of edge curvature of sintered samples were measured as a function of the loads in the range of zero to 1000 g/cm2.
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