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Chung, Hyung-Keun,Kim, Woon-Hoe,Park, Jeongwon,Cho, Jinwoo,Jeong, Tae-Young,Park, Pyung-Kyu Elsevier 2015 Journal of industrial and engineering chemistry Vol.28 No.-
<P><B>Abstract</B></P> <P>The aim of this study was to investigate how basic adsorption isotherms could be applied to predict removal efficiency or required adsorbent mass under given sets of initial conditions. The intrinsic parameters of the Langmuir and Freundlich adsorption isotherms were experimentally obtained and subsequently utilized to predict removal efficiencies for other sets of initial solute concentrations, solution volumes, and adsorbent masses, or to estimate the adsorbent mass required to remove solute at a desired removal efficiency. This was accomplished by combining the isotherms with mass balance of solutes between liquid solution and solid adsorbent phases.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Modeling by combining the isotherm equations with mass balance to predict the removal efficiencies and adsorbent mass required. </LI> <LI> Contour plots of predicted removal efficiencies as functions of both initial solute concentration and adsorbent mass. </LI> </UL> </P>
우리나라 중소기업 도금공정 근로자의 크롬 및 세척제 폭로에 관한 연구
이홍근,정문식,이경희,백남원,이나루,윤충식,정희경 한국산업위생학회 1993 한국산업보건학회지 Vol.3 No.1
Worker exposures to total chromium, hexavalent chromium (VI), sulfuric acid and alkaline dust at electroplating operations and worker exposures to trichloroethylene (TCE) and methyl chloroform (MCM) at degreasing operations in eleven small industrial plants were evaluated. Appropriate local exhaust ventilation systems for both operations were designed and recommended. Results of the study are summarized as follows ; 1. Out of 134 measurements for airborne hexavalent chromium concentrations, seven were exceeding the Korean occupational health standard of 50 ㎍/㎥ and 45 were exceeding the NIOSH standard of I ㎍/㎥. With an exception of one measurement, concentrations of total chromium were below the Korean standard of 500 ㎍/㎥. 2. Worker exposures to chromium were closely related to the existing control methods at the electroplating operations. Local exhaust systems, partial coverage of the tank surface, and antifoaming agents on liquid surface were adopted as control methods. 3. With an exception of one sample, airborne concentrations of sulfuric acid and alkaline dusts were below the applicable occupational health standards. 4. Three plants indicated that airborne concentrations of TCE and MCM were exceeding the Korean standards. Other plants showed lower concentrations than the standards. It should be noted that, generally, the activities and workloads on the day of surveys were less than normal. 5. Since the most existing ventilation systems did not satisfy the ACGIH criteria, the ventilation systems should be improved. Some examples for designing appropriate ventilation systems are presented.
Tae Wan Kim,Dong Hoe Chung,Gang Seong Lee,Joon Ho Ahn,Joon Ung Lee,Min Jong Song,Won Jae Lee,Won Keun Han 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
We used the frequency-dependent response of an ITO/Alq3(60 nm)/Al device at two different bias voltages to perform an equivalent-circuit analysis of organic light-emitting diodes. The complex impedance Z of the device was measured in the frequency range of 40 Hz 1 MHz. A Cole-Cole plot showed that there were two dielectric relaxations at a bias below the turn-on voltage and one relaxation at a bias above the turn-on voltage. We were able to interpret the frequency-dependent response in terms of the equivalent-circuit model of a contact resistance Rs in series with a parallel combination of a resistance Rp and a capacitance Cp. We obtained a contact resistance Rs of around 90 , mainly from the ITO anode.
아미드 치환체를 갖는 히단토인계 화합물의 합성과 제초활성 연구
고영관(Young Kwan Ko),정근회(Keun Hoe Chung),류재욱(Jae Wook Ryu),우재춘(Jae Chun Woo),구동완(Dong Wan Koo),최정섭(Jung Sub Choi),김준영(Jun Young Kim),김태준(Kim Tae Joon),권오연(Oh Yeon Kwon),정봉진(Bong-Jin Chung),김대황(Dae-Whang 한국농약과학회 2006 농약과학회지 Vol.10 No.2
As an ongoing research program for the development of environmentally friendly new herbicide, several hydantoin derivatives 5a - 5i possessing amide subgroup were synthesized and shown to have interesting herbicidal activities exhibiting symptoms as Protoporphyrinogen IX oxidase inhibitor under postemergence upland greenhouse screening. Among derivatives tested, compound 5h showed superior herbicidal activity against upland problem weed, digitaria sanguinalis and aeschynomene indica to reference compound fluthiacet-methyl.
폐결핵환자의 폐환기기능 -제1편 폐결핵환자의 폐환기기능, 제2편 Bronchospirometry 를 이용한 좌우폐별 폐환기기능
김재원 ( Jae Won Kim ),정혜영 ( Hae Young Chung ),김광성 ( Kwang Sung Kim ),이증연 ( Jeung Yun Lee ),이정희 ( Jung Hee Lee ),오중근 ( Joong Keun Oh ),유회성 ( Hoe Sung Yoo ),오상백 ( Sang Baek Oh ) 대한결핵 및 호흡기학회 1973 Tuberculosis and Respiratory Diseases Vol.20 No.1