http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
황산염의 침해를 받는 고강도 콘크리트의 강도특성과 물성변화
박영식,서진국,이재훈,신영식,Park, Young-Shik,Suh, Jin-Kook,Lee, Jae-Hoon,Shin, Young-Shik 한국콘크리트학회 1998 콘크리트학회지 Vol.10 No.5
화학적으로 유해한 환경에 놓인 콘크리트 구조물은 필연적으로 그 기능이 악화되므로 혼화재를 포함한 고강도 콘크리트 또는 혼화재 그 자체가 화학물질에 오염된 환경하에서 어떤 변화를 일으키는가에 대한 연구의 필요성이 점점 증대되고 있다. 따라서 본 논문에서는 건설현장에서 가장 흔히 사용되는 보통강도 콘크리트와 실리카-흄을 포함한 포틀랜드시멘트 경화체인 고강도 콘크리트가 황산염의 침해를 받는 경우에 일어나는 강도특성과 물성변화를 조사하기 위하여 담수와 함께 황산나트륨, 황산마근네슘, 황산나트륨과 황산마그네슘의 혼합용액 등 여러종류의 황산염 용액에 실리카-흄을 사용한 고강도 콘크리트, 낮은 물-시멘트 비의 고강도 콘크리트, 보통강도의 콘크리트 등의 시험체들을 270일간 침지시켜 침지시간에 따른 압축강도 변화와 실리카-흄의 첨가량에 따른 압축강도 변화, 그리고 실리카-흄의 첨가량에 따른 선형팽창량 및 중량변화등에 관한 실험을 수행하였다. 이에 대한 실험결과를 토대로 실리카-흄을 사용한 고강도 콘크리트에 황산염이 미치는 영향을 분석하여 고강도 콘크리트의 실용성을 극대화하기 위한 방안에 대하여 고찰해보았다. 그 결과 실리카-흄을 포함한 고강도 콘크리트는 황산나트륨의 침해에 대해서는 강한 저항성을 나타내지만 황산마그네슘에 대해서는 심각한 침해를 일으키는 것으로 나타났으므로 황산마그네슘에 노출될 우려가 있는 콘크리트 구조물에 고강도를 발현하기 위하여 실리카-흄을 사용하는 것은 구조적으로 큰 문제가 발생할 것으로 사료된다.
Dunaliella salina 의 광 제한 현탁 연속배양에 의한 ${\beta}$-carotene 의 생산
박영식,유호금,오상집,이현용,Park, Young-Shik,You, Ho-Keum,Ohh, Shang-Jip,Lee, Hyeon-Yong 한국미생물 · 생명공학회 1993 한국미생물·생명공학회지 Vol.21 No.4
It was proved that the cell growth followed a photo-inhibition model in light-limited turbidostat cultivation, having 1.06 (1/h) of maximum specific growth rate and 0.00094(kcal/$cm^2$/h) and 0.063 (kcal/$cm^2$/h) as half saturation and light inhibition constants, repectively. ${\beta}$-carotene production showed a growth related porcess. And the activation energy of Dunaliella salina was roughly estimated as 12.36 (kcal/mole) in employing Arrhenius relationship. It should also point out that relatively much porduction of ${\beta}$-carotene was observed at hight light intensity with yieding 1.04 (mg-carotene/g-dry cell/day) of specific product production rate while the cell growth was decreased. The optimal conditions of producing ${\beta}$-carotene in turbiodostat cultivation were as follows: $7.5{\times}10^{-3}$(kcal/$cm^2$/h)of light intensity, 2 (mM) and 50(mM) of nitrate and sodium bicarbonate concentrations and 100(ml/h) of $CO_2$ flow rate.
박영식,김현규,임서규,박경유,이현용,Park, Young-Shik,Kim, Hyun-Kyu,Lim, Seo-Kyu,Park, Kyung-You,Lee, Hyeon-Yong 한국미생물 · 생명공학회 1994 한국미생물·생명공학회지 Vol.22 No.4
8 X 10$^{6}$(viable cells/ml) of maximum cell density and 9000(IU/ml) of $\gamma$-IFN production were obtained at 55(ml/hr) of a perfusion rate by cultivating HSF cells using a moving membrane aeration bioreactor. This system proves to be an efficient culture process by maintaning 90% of viable cells during the whole cultivation periods. The metabolic molar quotient of glucose to lactate was 0.81 for overall ranges of glucose consumed while the evolution of ammonia was not linearly related to the consumption of glutamine. Low molar conversion ratio was observed in low consumptions of glutamine and high molar conversion ratio in high comsumptions. It also shows that the glutamolysis plays important role in the steady state conditions by evolving larger quantities of ammonia than lactate. At the above of 50 rpm, which is the optimum agitation speed for this bioreactor, the cell growth was severely affected while the IFN production was less decrea- sed, maintaing 1.5 X 10$^{-3}$(IU/cell/day) specific IFN production rate. The cumulatvie $\gamma$-IFN production was 7.2 X 10$^{8}$(IU) for 70 days of the cultivation, which yields 1 X 10$^{7}$ (IU/day) of IFN production rate. Therefore, a commercial production of $\gamma$-IFN by this culture process can be achievable by maintaining the above IFN productivity in a scaled-up culture system.
수종 (數種) 담수어류의 (淡水魚類) 생태와 해수적응에 관한 비교연구
박영식 ( Young Shik Park ) 한국하천호수학회 1971 생태와 환경 Vol.4 No.1·2
Ecology and acclimatization of freshwater and marine fishes, to sea water which living togeter in the pool near the watergate of sea water reservoir located at Yamoksa-ri, Maesong-myun, Whasung-gun, Kyunggi-do has been investigated from March, 1969 to October, 1970. 1. Though salinity of pool is changed to the level of that of fresh water during rainy season and raised up to the level of that of sea water during dry season, 4 species of fresh water fishes including A. latipes and 2 species of marine fishes including P. cantonnsis were living togeter in the pool. 2. In accordance with the adaptability of fishes to sea water, limit salinities for survivals of A. latipes, M. chinensis and M. oxycephalus and C. auratus are 3/5∼3.5/5, 2.5/5 ∼3/5 and 2/5∼2.5/5 sea water respectively. 3. When 4 species of fishes are transferred from fresh water to various salinities of 2/5→2.5/5→3/5→3.5/5→4/5→4.5/5→5/5 sea water successively for every 48 hours, A. latipes can be adapted to pure seawater, but M. chinensis, M. oxycephalus, and C. auratus can not be adapted to the salinity above 3.5/5 sea water. 4. When fishes of 4 species pretreated to 2/5 sea water for 48 hours are transferred from 2/5 to pure sea Water, A. latipes can be adapted to pure sea water completely. However, all of C. auratus and M. oxycephalus are died within 6 hours and M.chinensis died within 20 hours. 5. Relative adaptabilities of 4 species of freshwater fishes to sea water are as follows: A. latipes> M. chinensis> M. oxycephalus> C. auratus.
경화제를 사용하지 않은 에폭시 시멘트 모르타르의 압축강도 특성에 관한 연구
박영식(Young-Shik Park) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.4
The durable lifetime of RC structures is shortened by various reasons, which are the generation of cracks in construction and service term, the exterior deterioration according to climatic condition, the surface damage due to chloride attack and the corrosion of reinforced bars. The durability of concrete structures is nevertheless able to be increased by the method and the material of reinforcement and repair. The epoxy resin is widely used for reinforment and repair of concrete because of the superiority in mechanical property, adhesive property, abrasion resistance, impact resistance and chemical resistance. The epoxy cement mortar with hardening agent has a lot of disadvantages that are troublesome mixing work, weakened weatherability and high cost for hardening agent. In this study, the mix proportion of mortar is presented just only with epoxy resin and some admixtures, and the test result of mortar without hardening agent shows the higher strength than the mortar with hardening agent. In the mix proportion, the weight of epoxy resin must be less than 15% of the unit weight of cement, and 10% of unit weight of cement is adequate for the weight of admixtures.
송사리의 아가미 조직에 미치는 식염의 영향에 관한 연구
박영식 ( Young Shik Park ) 한국하천호수학회 1976 생태와 환경 Vol.9 No.3·4
1. Apiochilus latipes were reared in the salt solution of 17.5‰, and then removed to those of 23.3, 28.0, and 35.0‰ one after another. The changes of the opithelial cells of the gill was studied under the light and electron microscopes. 2. The number of mucous cells increased by the treament of 28.0‰ of salt, but decreased by the treatment of above 35.0‰. 3. The organelles of the epithelial cells, except the salt cells and mucous cells, were destroyed by the increasing concentration of salt. 4. The number of the tubular smooth surfaced endoplasmic reticula and mitochondria of salt cells were increased by the increase of the concentration of salt. The autolysis of the organelles in the salt cell was appeared by the long term treatment of 35.0‰ of salt. 5. Some unidentified cells, similar to the salt cells, were appeared by the salt trearment.