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崔鍾旭,鄭信敎,黃鉉周 경북대학교 산업기술연구소 1987 産業技術硏究誌 Vol.15 No.-
This study was performed to examine the drying characteristics of the potato at various drying conditions. The eqilibrium moisture content was in the range of 0.058-0.207 g/g. The critical moisture content and diffusion coefficient were in the range of 3.151-4.210 g/g, 0.622 × 10 exp (-5)㎝/sec respectively. Comparing with other food stuffs, the activation energy (6.0 ㎉/㏖) of the potato appeared low. The drying curve equation and the drying rate equation were obtained as follows: Y=4.34×e^-0.553t dy/dt= -2.40×e^-0.553t When the initial moisture content of the potato is known, this equation can be used to predict the drying rate of the potato.
알칼리 용제를 이용하여 제조한 셀룰로오스 겔의 카드뮴 흡착특성
황교정(Kyo-Jung Hwang),권구중(Gu-Joong Kwon),양지욱(Ji-Wook Yang),황원중(Won-Jung Hwang),황재현(Jae-Hyun Hwang),김대영(Dae-Young Kim) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.6
This study was carried out to investigate the characterization of cadmium adsorption by cellulose hydrogel and aerogel. Hydrogel and aerogel were made from ashless pulp dissolved in alkali hydroxide-urea aqueous solution and manufactured in film and bead types. After regeneration of cellulose, hydrogel went through the process of substitution of organic solvent and freeze-dry in order to make aerogel. SEM was used to analyze the microstructure of hydrogel and aerogel. Experiment was conducted in various concentrations and pH conditions to find out the characteristic of cadmium adsorption. After that, EDS was used to identify existence and distribution of cadmium in hydrogel and aerogel. The result from comparisons of cadmium adsorption shows that bead type aerogel has the maximum cadmium adsorption and film type hydrogel has the minimum cadmium adsorption.
전기선 폭발법에 의해 제작된 에틸렌 글리콜 기반 ZnO 나노유체의 열전도도
김현진(Hyun Jin Kim),황교식(Kyo Sik Hwang),신현교(Hyun Kyo Shin),이창규(Chang kyu Rhee),이경자(Gyung-Ja Lee),윤종호(Jong-Ho Yoon),장석필(Seok Pil Jang) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.2
본 연구에서는 에틸렌 글리콜 기반의 ZnO 나노유체의 열전도도를 비정상열선법(Transient Hot Wire Method)를 이용하여 10℃에서 50℃까지 측정하였다. 에틸렌 글리콜 기반의 ZnO 나노유체는 전기선 폭발법을 사용하여 부피비 1%, 3%, 5.5%로 제작 되었으며, 투과전자현미경(Transmission Electron Microscope, TEM)을 이용하여 제작된 에틸렌 글리콜 기반의 ZnO 나노유체의 분산·부유 특성을 확인하였다. 열전도도 측정 결과 에틸렌 글리콜 기반의 ZnO 나노유체는 부피비에 따라 향상하였으며, 5.5%의 부피비에서 최대 26.5%의 열전도도 향상을 보였다. 측정 결과는 기존의 열전도도 예측 모델인 Maxwell 및 Hasselman & Johnson model 과 비교하였다. In this paper, the thermal conductivities of ethylene glycol? based ZnO nanofluids manufactured using the pulsed wire evaporation method are experimentally measured using the transient hot wire method at temperatures in the range of 10℃ to 50℃. For this purpose, ethylene glycol?based ZnO nanofluids with 1%, 3%, and 5.5% volume fractions were manufactured using the pulsed wire evaporation method. Transmission electron microscopy (TEM) was performed to investigate the suspension stability of the ethylene glycol?based ZnO nanofluids. Based on the experimental results, the thermal conductivities of ethylene-glycol-based ZnO nanofluids increase with increasing volume fractions of ZnO nanofluids. The maximum enhancement of the thermal conductivity is 26.5% for a volume fraction of 5.5% at 22℃. Finally, the experimental results are compared with conventional models such as the Maxwell and Hasselman & Johnson models.
전기선 폭발법에 의해 제작된 에틸렌 글리콜 기반 ZnO 나노유체의 열전도도
김현진(Hyun Jin Kim),황교식(Kyo Sik Hwang),신현교(Hyun Kyo Shin),이창규(Chang Kyu Rhee),이경자(Gyung-Ja Lee),장석필(Seok Pil Jang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper, thermal conductivities of ethylene glycol-based ZnO nanofluids which are manufactured by pulsed wire evaporation method are experimentally investigated by transient hot wire method for different temperatures ranging from 10℃to 50o℃. For the purpose, ethylene glycol-based ZnO nanofluids with 1% and 5.5% volume fraction are manufactured by pulsed wire evaporation method. TEM is measured to investigate suspension stability of ethylene glycol-based ZnO nanofluids. According to the experimental results, thermal conductivities of ethylene glycol-based ZnO nanofluids are increasing as volume fraction of ZnO nanofluids is getting higher and maximum enhancement of thermal conductivity is 26.5% for volume fraction 5.5% at 22℃. Finally, experimental results are compared with conventional model such as Maxwell and Maxwell-Garnett model.
Kyo Seon Hwang,Tae Song Kim,Inho Han,Jeong Hoon Lee,Joo Hyun Noh,Jung Ho Park 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.52
We have developed a new passivation method of MEMS-based biosensors using parylene-c for application of an electrical protein mass detection system in a liquid environment. Because the adhesion property of gold for protein-protein interactions on parylene-c is poor, we performed atmospheric-plasma treatment of the parylene-c surface for adhesion enhancement. The surface properties of the treated parylene-c surfaces were investigated by measuring the contact angle, calculating the surface energy, observing the microstructure with a scanning electron microscope images, measuring the root-mean-square (RMS) roughness, and performing tape-test analysis. The surface energy increase of parylene-c due to the atmospheric-plasma treatment was demonstrated using the water-drop method with water and formamide. An atmospheric-plasma treatment for 120 seconds was benecial, resulting in a surface energy increase of gold on the parylene-c lms. The adhesion improvement of gold on the parylene-c was attributed to increased grain size and increased RMS roughness.
Isolation and Purification of Polyhydroxylated Alkaloids from Silkworm (Bombyx mori L.)
( Hyun Su Kim ),( Hyun Jung Ko ),( Yong Seak Cho ),( Jae Yeon Lee ),( Kyo Yeol Hwang ),( Jin Won Kim ),( Heui Sam Lee ),( Ik Soo Kim ),( Kang Sun Ryu ),( Young Ho Kim ),( Su Il Seong ) 한국잠사학회 2003 International Journal of Industrial Entomology Vol.7 No.2
Kyo Min Hwang,Song Eun Lee,Sungkyu Lee,Han Kyu Yoo,Hyun Jung Baek,Young Kwan Kim,Jwajin Kim,Seung Soo Yoon 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.3
In this study, we fabricated hybrid white organic light-emitting diodes (WOLEDs) based on triplet harvesting with a simple structure. All the hole transporting material and host in the emitting layer (EML) of devices utilized the same material N,N0-di-1-naphthalenyl-N,N0-diphenyl- [1,10:40,100:400,1000-quaterphenyl]-4,4000-diamine (4P-NPD), which is known to be blue fluorescent material. Simple hybrid WOLEDs were fabricated with blue fluorescent, green and red phosphorescent materials. We investigated the effect of triplet harvesting (TH) by an exciton generation zone on simple hybrid WOLEDs. The simple hybrid WOLEDs characteristically had a dominant hole mobility, so an exciton generation zone was expected in the EML. Additionally, the optimal the thickness of the hole transporting layer and electron transporting layer was fabricated a simple hybrid WOLEDs. The simple hybrid WOLED exhibits a maximum luminous efficiency of 29.3 cd/A and a maximum external quantum efficiency of 11.2%. The Commission Internationale de l0 ´Eclairage (International Commission on Illumination) coordinates were (0.45, 0.43) at about 10,000 cd/m2.
흡광 광도법에 의한 미량 텅그스텐의 분석법에 관한 연구
황교현 大田工業專門大學 1982 論文集 Vol.31 No.-
Zephiramine reacts with complex tungsten thiocyanate in to form light-yellow precitate. The precipitate is extracted with chloroform. The extract is stable for at least 5days and has absorption miximun at 405 ㎛. The mole ratio of tungsten to zephirarmina in the extracted species is 1 : 1 Beer's law holds for the chloroform extract when tungste-thiocyanate-zephiramine is extracted into 10.0 ㎖ of chloroform from 25.0 ㎖ of the sample solution containing 2×10^-6M~2×10^-5 M tungsten. Many ions except vanadate and molybdate do not interfere with the determination.
2, 2´ _dipyridylglyoxeal_bis(4,4_diphenylsemicarbazone)에 의한 닉켈(Ⅱ)의 용매추출 흡광광도법에 관한 연구
황교현 大田開放大學 1986 論文集 Vol.5 No.-
The use of 2,2'-dipyridylgIyoxal-bis (4,4-diphenylsemicarbazone) (PGPC), which was prepared by refluxing a 1:2 mixture of 2,2'-dipyridylgIyoxal and 4,4-diphenylsemicarbazone, was proposed for the spectrophotometric determination of nickel (Ⅱ) by solvent extraction. PGPC reacted with nickel (Ⅱ) to form a water-insoluble complex, which could be extracted with chloroform. The extracted solution showed an absorption maximum at 420nm. The calibration curve obeyed Beer's law over the concentration range 1㎍/10ml to 12㎍/10ml of nickel (Ⅱ) at 420 nm in the range of pH 4.5 to 10.6. The apparent molar absorption coefficient of the complex in chloroform was 5.42×10^4 d㎥ mol^(-1) cm^(-1). The combining ratio of nickel and PGPC was confirmed to be 1:2 by both the continuous variation method and elementary analysis on the isolated PGPC-nickel (Ⅱ) complex. Following procedures were recommended for the determination of nicdel (Ⅱ); The sample solution containing less than 12㎍ of nickel (Ⅱ) in a 100ml separatory funnel was adjusted to pH 4.5 to 10.6 with acetate or ammonia buffer solution, and then 5ml of 5×10^(-4)M PGPC methanol solution was added. The solution was diluted to about 60ml with water, and was shaken with 10ml chloroform for 3 min. After separation to two phases, the absorbance of the complex in chloroform phase was measured at 420 nm against the reagent blank.