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이기창,은종방,황수정 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.5
This study aimed to investigate the effects of varying mixtures of maltodextrin and corn syrup on the physicochemical characteristics and sensory evaluation results of mandarin beverage powder under different spay drying conditions including inlet air temperature and concentration of carrier agents. Higher inlet air temperatures increase in the a* value, pH, and WSI while decreasing the moisture content, L* value, b* value, vitamin C content, and bulk density. Increasing carrier agent concentration caused increases in the L* value and pH along with decreases in the moisture content, a* value, b* value, WSI, vitamin C content and bulk density. Water activity and WAI showed no significant differences among samples. Drying yield was maximized when the inlet air temperature reached 135oC and the carrier agent concentration was 35%. In sensory evaluation, as the concentration of the carrier agents increased, the taste received a higher preference rating, while the color was less preferred.
이기창,류정욱 한국유화학회 1992 한국응용과학기술학회지 Vol.9 No.2
The kinetics of the hydrolysis of indolylacrylophenone derivatives(IA) was investigated by ultraviolet spectrophotometry in 30% dioxane-H_2O at 25℃. Rate equations were obtained over a wide pH range. On the basis of rate equation, general base catalysis and Hammett's plot, the mechanism of hydrolysis to the (IA) were proposed ; Below pH 3.0, the hydrolysis of (IA) was proportional to hydronium ion concentration, between pH 4.0~9.0 neutral water molecule and hydroxide ion were added to carbon-carbon double bond and over pH 10.0 hydrolysis of (IA) was proportional to hydroxide ion concentration.
Oadiazole 유도체의 고리화 첨가반응에 의한 Pyrazole 유도체의 합성
이기창,황성규,이광일,최봉종 ( Ki Chang Lee,Sung Kwy Hwang,Kwang Ill Lee,Bong Jong Choi ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.1
The synthetic method of pyrazole was performed by 1,3-dipolar cycloaddition with dipolarophileinstead of the reaction between diazomethane and acetylene. The cycloaddition mechanism and reac-tivity of 3-phenyloxadiazole derivatives with dipolarophiles was investigated. In order to investigatethe mechanism and reactivity of this cycloaddition, the effect of substituents having various kinds ofelectron withdrawing of releasing groups were examinated. Considering the effect of substituents, anelectron withdrawing group attached at the 4-carbon position in 3-phenyloxadiazole derivatives decrease the reaction rate because of the lack of electron density on oxadiazole ring. The reaction rate of3-phenyloxadiazole derivatives with dipolarophiles were more conveniently measured using UV thanusing a volumetric analysis which was used before. From the result of this study, it was that thecycloaddition was found to be a first-order reaction depending upon the concentration of 3-phenyloxadiazole only.
Furfurylidene acetophenone 유도체에 대한 Thiourea 의 친핵성 첨가반응 메카니즘과 그 반응속도론적 연구
이기창,목갑영,오세영,류정욱 ( Ki Chang lee,Gab Young Mok,Se Young Oh,Jung Wok Ryu ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.1
Furfurylidene acetophenone derivatives were synthesis, it was measured that nucleophilic addition made use of UV at a wide pH 1.0∼13.0 range in 30% dioxane-H_2O solution, 25℃. On the basis of general base catalysis, substitutent effect, confirmation of nucleophilic addition products, it was measured the reaction rate of furfurylidene acetophenone derivatives for the pH change. It may be concluded that a part was unrelated to pH and another part was in proportion to concentration of hydroxide ion : Above pH 10.0 sulfide anion adds to the double bond(Michael type addition), a part having no concern with pH, addition reaction to double bond is initiated by addition of neutral thiourea molecule. From the result of measurement the reaction rate, nucleophilic addition of furfurylidene acetophenone derivatives confirmed to the irreversible first order, Through measurement the substituent effect, It found that reaction rate was accelerated by electron attracting group. On the basis of these findings, nucleophilic addition of thiourea for the furfurylidene acetophenone derivative was proposed a fitting mechanisms.
1,1,1-TCE , CFC-113 대체세정제를 이용한 스크린인쇄 세정연구
이기창,윤철훈,황성규,오세영,이석우,류정욱 ( Ki Chang Lee,Cheol Hun Yoon,Sung Kwy Hwang,Se young Oh,Seok Woo Lee,Jung Wok Ryu ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.2
The field of printing use to pressurization ink using screen gassamer that is called screen printing. Existing cleaning solvent using screen printing are he organic solvents including aromatic compounds carried with poisonous and stench. Besides, cleaning method of current screen printing are for the most part mixed cleaning method of dipping and polish. Using 1,1,1-TEC, CFC-113 alternative system cleaning solvent be substituted for existing cleaning solvent against screen printing ink measured the cleaning efficiency according to gravimetric analysis method and property change of gassamer according to Image Analyzer. Also, Cleaning process system carry with excellent cleaning efficiency studied which was proposed new cleaning process including ultrasonic and vibration cleaning process be substituted for existing mixed cleaning method of dipping and polish.
불완전한 잡음 예측하에서 OFDM 시간 동기화 기법의 성능 분석
이기창,윤영중,Lee, Ki-Chang,Yoon, Young-Joong 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.3C
본 논문에서는 시간 동기 추정을 위한 잡음 예측이 불완전한 경우에 직교분할 주파수 다중화 (OFDM) 시스템의 시간 동기 확률을 다중 경로 레일레이 페이딩 채널 환경에서 분석한다. 시간 동기 방식은 반복되는 CAZAC 시퀀스에 대한 상관기 구조를 가지며, 심벌간 간섭을 줄이기 위한 pre-advancement 기법을 적용한다. 시스템의 성능 평가 척도로서, 다중 경로 레일레이 채널 환경에서 유도된 동기 검파 확률을 분석한다. This paper derives and computes the detection probability of timing synchronization in an orthogonal frequency division multiplexing (OFDM) system encountered with a multipath Rayleigh fading channel and imperfect noise estimation. The timing synchronization scheme using a simple repeated constant amplitude zero auto-correlation (CAZAC) training symbol and correlation techniques is adopted. With this provision, we focus on the numerical analysis for OFDM timing synchronization scheme employing a preadvancement technique to reduce the inter-symbol interference (ISI). For measuring system performance, the detection performance derived in the considered system is presented in a multipath Rayleigh fading channel.
개에서 특발성 위 분문부 및 유문부 괄약근이완무력증 1례
이기창,신승호,김남수 한국임상수의학회 2006 한국임상수의학회지 Vol.23 No.3
A 4-month-old, intact male, Tosa with a history of a regurgitation, vomiting, and weight los for threeweeks was presented to Animal Medical Center, Chonbuk National University. In Serial plain radiographs, a severelyan obstruction of pyloric region by pyloric achalasia. An esophagram and endoscopy revealed normal peristalsis withfailure of the lower esophageal sphincter to open, supporting the diagnosis of esophageal achalasia. Megaesophaguswas observed on reradiograph and esophagram 11 days later. The clinical signs and esophageal dilation were resolvedwithout resorting to any treatment.
이기창,최성용,배남경,윤철훈,황성규 ( Ki Chang Lee,Sung Yong Choi,Nam Kyoung Bae,Cheol Hun Yoon,Sung Kwy Hwang ) 한국유화학회 1996 한국응용과학기술학회지 Vol.13 No.3
Naphthoquinone-1,2-diazide-5-sulfony[NDAS] derivatives members of quinone diazide compound that are utilizable as photosensitive polymer material were synthesized, and photoresist were prepared by mixing these derivatives with mcresol novolak(a matrix resin) at various weight ratios. Photosensitive characteristics of photoresist were studied by examining UV and IR, relative sensitivity using a Gray scale method, and SEM to analyze if they can be used as photosensitive material in printing process. Experimental results showed that, by UV, NDAS derivatives were photoconverted and developer-soluble photoresist were produced. The mixing ratio of 1:4(by mass) of NDAS+phydroxybenzophenone+sensitizer and mcresol novolak gave rise to the highest dissolution rate. In addition, photoresist obtained at this condition resulted in the most superior sensitivity and contrast.