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RISS 인기검색어
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- 저자 : 이동주 ( Dong-joo Lee ) (검색결과 376 건)
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SNL-EFDC를 이용한 군산항 유사퇴적고 계산의 비교 연구
이동주 ( Dong-joo Lee ),송상현 ( Sang-hyun Song ) 한국환경기술학회 2015 한국환경기술학회지 Vol.16 No.4
본 논문은 Ziegler, Lick, and Jones에 의해 개발된 SEDZLJ라 부르는 유사역학 알고리즘이 계산되는 SNL-EFDC 모델을 이용하여 군산항의 퇴적고 계산에 관하여 연구하였다. SEDZLJ모듈은 SEDflume 이나 Annular flumes로부터 얻은 현장 침식률 및 침식 한계전단응력 자료를 직접 결합할 필요가 있다. 군산항에서는 SEDflume 자료를 구할 수 없기 때문에 Ryu와 Yim에 의한 Annular flumes 실험으로부터 얻은 현장 침식률 및 침식 한계전단응력 자료를 이용하였다. SNL-EFDC 모델이 군산항의 유사퇴적고를 계산하기 위해 적용되었고 관측된 부유사 농도와 퇴적고를 사용하여 검증되었다. 유사 퇴적고 계산에 대한 모델의 적용성은 NSEC가 0.72로 침식과 퇴적의 물리적 변화가 적절하게 재현됨이 입증되었다. 부가적으로 검증된 모델은 저면 활성층두께에 대한 매개변수 α값의 영향을 조사하기 위해 사용되었고, Lee와 Park에 의해 수행된 SEDTM을 이용한 유사이동 계산의 결과와 비교하기 위해 사용되었다. 그 결과, 매개변수 α값의 변화는 유사퇴적고 계산에 미미한 영향이 미치는 것으로 나타났다. SEDZLJ에 의한 결과를 SEDTM의 것과 비교할 때 SEDZLJ모듈이 군산항에서 SEDTM 보다 NSEC가 0.03향상 되어 토사이송 과정을 재현함이 확인되었다. This paper was studied on the sediment deposition height computation at Gunsan port using recently advanced SNL-EFDC model which the sediment dynamics algorithm was called as SEDZLJ developed by Ziegler, Lick and Jones. SEDZLJ module needs to directly incorporate site-specific erosion rate and critical shear stress data from SEDflume or Annularflumes. Here this model attempted to use site-specific erosion rate and critical shear stress data from Annular flumes experiment by Ryu and Yim instead of unavailable SEDflume data at Gunsan port. SNL-EFDC was applicated to calculate deposition height at Gunsan port and verified using observed values for suspended sediment concentration and sediment deposition height. The model applicability for sediment deposition height computation was evaluated as NSEC 0.72 and verified that it reproduced the physical variations of erosion and deposition. In addition, the verified model was used to investigate the effect of parameter “α” on the active bed layer thickness and used to compare with the result of sediment transport computation using SEDTM done by Lee and Park. As a result, it was found that the change of parameter “α” value has a negligible effect on sediment deposition height computation. As results of SEDZLJ are compared with those of SEDTM, it was identified that SEDZLJ module reproduces the sediment transport process more appropriately than SEDTM at Gunsan port with advanced NSEC 0.03.
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백금 도금된 탄소반죽 전극을 이용한 일회용 글루코오스 센서
이동주,유재현,최강,최문희,김문환,류준오,한상현,차근식,남학현,Lee Dong Joo,Yoo Jae Hyun,Cui Gang,Choi Moon Hee,Kim Moon Hwan,Ryu Joon Oh,Han Sang-Hyun,Cha Geun Sig,Nam Hakhyun 한국전기화학회 1999 한국전기화학회지 Vol.2 No.4
Carbon paste전극을 백금도금 한 후 이 전극을 사용한 일회용 전류법 glucose센서를 제작하였다. 전극에 시료용액을 가한 후, voltammetry을 이용하여 본 센서의 감응성을 연구하였다. screen printing된 carbon paste전극 표면 위에 전기도금 방법으로 도입된 백금은 센서의 분석성능과 mediator의 전기 화학적 가역성을 크게 향상시켜 준다. 제작된 센서가 $[Fe(CN)_6]^{4-/3-}$에 대한 heterogeneous rate constant는 $1.45\times10^{-2}cm{\cdot}s^{-1}$이며, 이 센서는 적용전위 0.3V vs. Ag/AgCl에서 glucose에 대한 좋은 감응성을 보여주었다. 이 때 glucose에 대한 Michaelis-Menten상수는 24.5mM이다. 일회용 glucose 스트립 센서의 분석성능을 평가하기 위하여 NOVA S.P. Ultra M analyzer와 비교실험을 수행하였다. 이 때 시료용액으로서 $80\~297 mg/dL$ 범위의 glucose를 함유하고 있는 30여 종류의 혈청을 사용하였고, 상관계수는 0.983으로서 정밀도와 정확도가 비교적 우수함을 보여주었다. Disposable, amperometric glucose sensor was constructed using platinised carbon paste electrode. The sensor response was studied by amperometry and cyclic voltammetry applying sample solutions on the strip-type electrode. Platinization of screen-printed carbon paste electrode effectively improved the electrochemical reversibility of a mediator and the analytical characteristics of the sensor. The heterogeneous rate constant for $[Fe(CN)_6]^{4-/3-}$ was $1.45\times10^{-2}cm{\cdot}s^{-1}$. An applied potential of 0.3V vs. Ag/AgCl resulted in the best selectivity for glucose. The apparent Michaelis-Menten constant for glucose on the strip sensor, $K_m^{app}$, was 24.5 mM. To evaluate the analytical performance of the glucose sensor strip, a correlation study was performed with the NOVA S.P, Ultra M analyzer for 30 serum samples containing $80\~297mg/dL$ of glucose: the correlation coefficient value was 0.983. It can be seen that the strip sensor has satisfactory precision and accuracy.
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Hellman 치령(齒齡) IVA 정상인(正常人)에 관(關)한 두부방사선학적(頭部放射線學的) 연구(硏究)
이동주,Lee, Dong Joo 대한치과교정학회 1979 대한치과교정학회지 Vol.9 No.1
This study was undertaken to establish the cephalometric standard of Hellman dental age IVA group of Korean. The subjects consisted of 40 males and 44 females with normal occlusion and aceptable profile. The results were obtained. 1) The tables of standard deviation from the measurements were made. 2) All linear measurement was greater in male than in female. 3) Female had more convex profile than male, 4) Facial convexity, upper and lower lip of esthetic line were gradually decreased with. age. 5) Upper incisor was gradually labioversioned with age.
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장경호 ( Koung-ho Jang ),박영기 ( Young-ki Park ),이동주 ( Dong-joo Lee ) 한국환경기술학회 2015 한국환경기술학회지 Vol.16 No.2
본 연구의 목적은 PCA를 사용하여 전주천의 주 수질 오염원을 평가하는데 있다. 자료는 전라북도 보건환경연구원의 1984년 ~ 1990년 동안의 총 8개 수질데이터가 이용되었다. PCA를 사용하여 3개 주성분(Highly factor, Medium factor, Less factor)을 평가하였으며, 수질항목에 대하여 HF(T-N) 50.3%, MF(SS) 17.7%, LF(COD) 13.3%로 나타났다. 수질 관측지점에 대해서는 HF(이성보) 84.3%, MF(전주천 6) 8.73%, LF(전주천 5) 4.55% 등으로 평가되었다. 수질항목, 관측지점 주성분을 직각회전기법(Varimax rotation)에 적용한 결과, 주성분의 모양이 요인축에 따라 그룹화 모양을 나타냈다. 이 모양에 의하면 주성분이 PCA에 의하여 평가되었다고 볼 수 있으며, PCA는 수질평가에 효과적인 기법이라 생각된다. The purpose of this study was to estimate the principal water quality pollution sources at the Jeon-Ju stream using PCA(Principal Component Analysis). All together, eight water quality factors (temperature, pH, DO, BOD, COD, SS, T-N, and T-P) 1984 ~ 1990 of Jeollabukdo Institude of Health & Environment Research were used by PCA and varimax factor rotation tool. The PCA assess three principal factors; relatively highly factor(HF), medium factor (MF), and less factor(LF). The result of application for water quality factors as follows. The HF(T-N) was 50.3%, MF(SS) was 17.7%, and LF(COD) was 13.3%. For water quality stations, the HF(Lee-sung bo), MF(Jeon-Ju stream 6) and LF(Jeon-Ju stream 5) were estimated to be 84.38%, 8.73% and 4.55%, respectively. The result of application for water quality factors and observing stations, the form of the principal factors shows grouping according to factors axis. According to this phenomenon, It was considered that principal component was response to results by PCA. The result of this study is demonstrated that PCA is very effective tool of analysis and interpreation for multi-water quality parameter and multi-station data sets.
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이동주 ( Dong Joo Lee ),서상수 ( Sang Su Seo ),김수경 ( Su Kyeong Kim ) 대한면역약침학회 2015 대한면역약침학회지 Vol.4 No.2
Objectives : HO-Yakchim and HN-Yakchim can improve wrinkles. However, these oil-type Yakchims show side effects such as induration or imperfect skin absorption. Therefore, a new Yakchim that can improve wrinkles without causing side effects is required. We developed a new Yakchim B (BY) for wrinkle improvement with a complex herbal extract containing Carthami Fructus, Juglandis Semen Oil, Phellodendri Cortex, Pulsatillae Radix, Sophorae Tonkinensis Radix et Rhizoma, Aucklandiae Radix, and Aquilariae Lignum and investigated the pharmacological activities of BY. Methods : The anti-oxidant effect of BY was investigated by determining its 2,2-diphenyl-1-picryl hydrazyl (DPPH) free radical scavenging activity. To investigate the anti-wrinkle activity of BY, its collagenase inhibitory activity was measured. To investigate the skin-lightening effect, the tyrosinase inhibitory activity was measured. In addition, the inhibitory effect of BY on LPS-induced nitric oxide (NO) production in RAW 264.7 cells was investigated and the cell viability of BY on RAW 264.7 cells was investigated using MTT assay. Results : B-Yakchim (10 mg/ml) showed a 52.7±1.0% DPPH radical scavenging rate and 19.4±1.3% collagenase inhibitory activity. However, B-Yakchim (1, 5, and 10 mg/ml) did not show tyrosinase inhibitory activity. B-Yakchim (1 mg/ml) inhibited LPS-induced nitric oxide (NO) production in RAW 264.7 and did not show cell toxicity in the MTT assay. Conclusions : These results suggested that BY has anti-wrinkle, anti-oxidant, and anti-inflammatory activities. These findings could facilitate the development of an anti-wrinkle Yakchim without side effects.
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