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실관막 모듈에서 Lix84에 의한 중금속 투과추출 제거
최대웅(Dai Woong Choi),신군섭(Kun Sub Shin) 한국환경보건학회 1999 한국환경보건학회지 Vol.25 No.1
Hollow fiber module contactor can be designed to provide a very high surface area per unit volume, which makes them very effective in comparison to conventional extraction equipment. Since the phases are separated by the membranes, the loading, flooding, and channeling constraints of conventional equipment are avoided. The optimum conditions for the change of H^+ concentration in heavy metal(Cu(II), Ni(II), Pb(II), Zn(II), Cd(II)) solution, the change of flow rate inside-outside hollow fiber membrane and the removal of heavy metal by the sort of extractant(Lix84-n-heptane, TOA-n-heptane, D2EHPA-n-heptane) were examined through perstraction of aqueous phase heavy metal from the hollow fiber module by organic extractant. Lix84 showed the best efficiency to Cu(II) extraction among a few kind of used extractant
최대웅 東義大學校 産業技術開發硏究所 1997 産業技術硏究誌 Vol.11 No.-
This study examines NI?? Liq-Liq Extraction by the microporous hollow fiber membrane, using D2EHPA as the metal extractant. After doing the experiments on the variation of H' concentration, flow rate and D2EHPA concentration which have important effects on Liq-Liq Extraction, it is known that the mass transfer increases as the flow rate and D2EHPA concentration increase when H' concentration is 10?? mol/d㎥ and for the Ni(II)-D2EHPA system, when H concentration is 10?? mol/d㎥ , kw is 12.64x10?? cm/sec.
3D 엔지니어링 설계 도구를 활용한 비정형 건축물의 외장제작 도면화 개발에 관한 연구
최정민(Choi, Jeong-Min),권순호(Kuea, Soon-Ho),고기웅(Ko, Ki-Woong),김대옥(Kim, Dai-Ock),옥종호(Ock, Jong-Ho) 한국산학기술학회 2009 한국산학기술학회 학술대회 Vol.- No.-
국내의 비정형 건축물은 현재 도입기로, 동대문디자인파크, 전곡선사박물관, 부산국제영화센터 등이 건설 계획되어지고 있지만 대부분이 실시설계 또는 착공단계에 머물고 있고, 아직까지 구체적인 시공단계에 이른 건축물이없는 실정으로 비정형외장재의 이중곡률 (Non-Uniform Rational B-Spines)을 반영한 프로토타이핑(Prototyping),패널화(Panelizing), 현장조립 시 기하학 통제기법, 시공오차 측정기법, As-Planned 도면과 As-Built 도면의 비교를통한 준공도면의 작성기법 등에 대한 준비가 절실히 필요한 상황이다. 그러나 현재 비정형 건축물의 설계는 초기계획(Concept Design) 단계에서 건축가와 구조기술자의 협업 중요성만 강조되고 있고, 건축물이 비정형화됨에 따라기하학적으로 설계 및 시공되어야 하는 건축물의 외장재에 대한 설계방법과 시공단계에서 시공품질 확보방안, 시공하자를 유발시키는 다양한 변수에 대한 대응방안 등은 아직까지도 그 중요성을 인식하지 못하고 있는 실정이다. 따라서 본 연구에서는 비정형 건축물의 설계에 사용되는 Architectural Geometry Control 도구 중 그 활용성이 부각되어 지고 있는 Bentley 사의 Generative Components를 활용하여 비정형 건축물의 이중곡률 곡면외장재의 부재생산을 위한 패널화, 제작도면 추출에 관한 연구를 수행하고자 한다.
Bae, Woong Jin,Choi, Yong Sun,Kim, Su Jin,Cho, Hyuk Jin,Hong, Sung Hoo,Kim, Sae Woong,Hwang, Tae-Kon,Kim, Dai Jin,Lee, Ji Youl The Korean Academy of Medical Sciences 2015 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.30 No.9
<P>Diabetes is related with a number of cystopathic complications. However, there have been no studies about the influence of alcohol consumption in the bladder of type 2 diabetes. Thus, we investigated the effect of moderate alcohol intake in the bladder of the Otsuka Long Evans Tokushima Fatty (OLETF) diabetic rat. The non-diabetic Long-Evans Tokushima Otsuka (LETO, n=14) and the OLETF control group (n=14) were fed an isocaloric diet; the LETO (n=14) and the OLETF ethanol group (n=14) were fed 36% ethanol 7 g/kg/day. After ten weeks, muscarinic receptors, RhoGEFs, myogenic change, and the level of oxidative stress were evaluated. Moderate alcohol intake significantly decreased excessive muscarinic receptor and Rho kinase expressions in the OLETF rats compared with the LETO rats. In addition, iNOS and collagen expression were not changed in the OLETF rats in spite of alcohol consumption. Superoxide dismutase levels, which is involved in antioxidant defense, in the LETO rats were significantly decreased after alcohol consumption, however those in the OLETF rats were similar. Moderate alcohol consumption reduces the oxidative stress, and may prevent molecular and pathologic changes of the bladder of rats with type 2 diabetes.</P>
수종(數種) 근관충전재(根管充?材)의 근관폐쇄(根管閉鎖) 효과(效果)에 관(關)한 자기(自記) 방사법적(放射法的) 연구(硏究)
최웅대,박상진,민병순,최호영,Choi, Woong-Dai,Park, Sang-Jin,Min, Byung-Soon,Choi, Ho-Young 대한치과보존학회 1989 Restorative Dentistry & Endodontics Vol.14 No.1
The purpose of this study was to evaluate and compare the sealing ability of ZOE, FR and Sealapex, as a root canal sealer. Ninety six extracted anterior or premolar human teeth with single root were instrumented by using conventional method. After instrumentation, the teeth were divided into three groups and thirty two teeth in each group were filled as follows: ZOE group: ZOE cement as a root canal sealer in combination with guttapercha cone FR group: FR root canal sealer in combination with guttapercha cone Sealapex group: Sealapex root canal sealer in combination with guttapercha cone $^{45}Ca$ in the form of calcium chloride, was employed as the tracer in this study and produce the auto-radiograph. The depth of isotope penetration into the root canal was evaluated by method by Yates and Hembree at the intervals of 1 day, 7 days, 14 days and 30 days. The following conclusions were derived from the results obtained; 1. After 1 day, ZOE group exhibited the greatest penetration degree of radioisotope (p < 0.05). 2. After 14 days, there was some difference of the radioisotope penetration between each group, but its difference was not significant statistically. 3. After 30 days Sealapex group exhibited the least penetration degree of radioisotope (p < 0.025). 4. In ZOE and Sealapex groups, there was no change of the degree of radioisotope penetration with time.