• 방사성폐기물학회지
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• 제10권2호
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• pp.87-96
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• 2012

원자력시설 유지보수 및 해체시 다관절 매니퓰레이터 이상동작에 대한 작업자의 반응특성과 안전속도 수준을 다루고 있다. 매니퓰레이터 팔의 속도, 오류 가능성, 오류 형태와 같은 여러 가지 작업 조건에 따라 작업자의 반응시간, 고장 경보(false alarm), 실패(miss) 횟수 등에 대한 작업자의 반응 특성을 분석하였다. 매니퓰레이터 팔의 속도와 이상동작 형태는 반응시간에 영향을 주지만, 이상동작 가능성에 영향을 미치지 않았고, 두 요인 이상의 교호작용은 대체로 영향이 없었다. 매니퓰레이터 팔의 속도변화에 따른 반응시간 특성은 이상동작 형태에 따라 다르지만 대체로 약간 증가하는 추세를 보였다.

• 한국구조물진단유지관리공학회 논문집
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• 제16권5호
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• pp.59-67
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• 2012

시멘트를 생산할 때 발생하는 이산화탄소로 인하여 콘크리트를 활용하는 건설산업의 친환경성이 문제시 되어가고 있는 실정이다. 이에 본 연구에서는 석회석미분말로 시멘트를 대체하는 기술의 기초연구로서 석회석미분말을 함유한 콘크리트의 내구특성에 관하여 특성을 파악하고자 하였다. 실험변수는 석회석미분말의 시멘트 치환률을 0%에서 25%까지 5%씩 중가하였으며 동결융해 저항성, 제설염 저항성 및 알칼리-실리카반응 저항성 등의 내구특성과 기초적인 경화특성 등을 분석하였다. 석회석미분말의 사용으로 인한 동결융해저항성, 제설제염 저항성 등의 영향은 거의 없는 것으로 나타났으며 또한 알카리-실리카반응성의 억제를 위하여도 긍정적으로 검토될 수 있을 것으로 판단된다.

• 대한기계학회논문집B
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• 제21권2호
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• pp.213-223
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• 1997

Premixed flame is better than diffusion flame to accomplish a high loading combustion. Since the turbulent characteristics of unburned mixture has a great influence on the flame structure, it is general that many researchers realize a high loading combustion with strengthening turbulent intensity of unburned mixture. Because turbulent premixed flame reacts efficiently on the condition of distributed reaction region, we made high turbulent premixed flame in the doubled impingement field. We investigated turbulent characteristics of unburned mixture with increasing shear force and visualized flames with direct and Schlieren photographs. And the combustion characteristics of flame was elucidated by instantaneous temperature measurement with a thermocouple, by ion currents with a micro electrostatic probe, by radical luminescence intensity and local equivalence ratio. Extremely strong turbulent of small scale is generated by impingement of mixture, and turbulent intensity of unburned mixture increased with the mean velocity. As a result of direct photographs, visible region of flame became longer due to increasing central direction flux. But as strengthed turbulent intensity, visible region of flame turned to shorter and reaction occurred efficiently. As strengthened turbulent intensity of mixture with increasing flux of central direction, maximum fluctuating temperature region moved to radial direction and fluctuation of temperature became lower. The reason is influx of central direction which caused flame zone to move toward radial direction, to maintain flame zone stable and to make flame scale smaller.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 1998년도 추계학술발표 논문집
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• pp.172-177
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• 1998

For making high-functional illumination environment and pleasantness to human beings, it is needed to analyze optical characteristics from lightsource as well as to analyze and examine emotional characteristics which respond to optical characteristics systematically. Also, it is Possible to classify lightsource according to function and use based on optical and emotional characteristics systematically and these results can be applied to practical data for professional illumination design field. The aim of this study is to develop technique for evaluating sensibility as well as to accumulate sensibility database through measuring and evaluating emotional reaction to optical characteristics from lightsource. Final aim of this study is to develop simulation and evaluation technique for interior illumination environment, the outline of this paper : 1) operating simulator for various illumination environment 2) developing evaluation methodology for evaluating illumination environment 3) preparing sensibility index through evaluation and analysis The process of this study is as follows. 1) Developing optical evaluation item of lightsource 2) Developing emotional evaluation item of lightsource 3). Analyzing, correlation between optical evaluation item and emotional eveluation item 4) Classifying and selecting object for evaluation 5) Optical measuring and evaluating for lightsource 6) Operating Simulator for illumination environment 7) Emontional measuring and evaluating lightsource and color 8) Developing estimative formula and sensibility index of emotional reaction The results of this study are as follows. 1. Simulator is operated for various illumination environment, and it is proved to be applicable to actual environment. 2. Evaluation and Analysis Techniques is developed for emotional measurement about illumination environment. 3. Estimative formula and sensibility index are prepared, which can estimate the characteristic of lightsource and emotional reaction to interior color

• Korean Chemical Engineering Research
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• 제46권2호
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• pp.301-309
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• 2008

본 연구에서는 레졸수지 합성에서 부가반응 실험변수인 F/P 몰비, 촉매 wt% 및 반응온도가 페놀치환체에 미치는 영향을 2단 실험계획법을 사용하여 실험하고 실험 결과를 삼원변량분석법(ANOVA, SPSS)을 사용하여 해석하였다. 페놀치환체는 반응시간 300분에서 F/P 몰비가 높을수록, 반응온도가 낮을수록, 촉매량이 적을수록 증가하는 경향을 보였고 ortho 지향성이 있음을 확인하였다. 레졸형 페놀수지의 합성에서 페놀계 치환체의 해리반응과 메틸렌글리콜 형태의 포름알데하이드의 분율을 고려하는 Zavitsas류의 속도론 모델을 단순화시킨 기초반응 모델을 제시하고 Zavitsas류의 속도론 모델과 비교하였다. 기초반응 모델은 평균적으로 2.79%의 오차를 보였으며 Zavitsas류 모델의 오차인 3.27%와 비슷한 값을 보이는 것을 확인하였다. 따라서 본 논문에서 제시한 기초반응 모델은 레졸합성의 부가반응 속도론 연구에 적용 가능하다고 판단된다.

• 한국세라믹학회지
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• 제46권3호
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• pp.288-294
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• 2009

The platelet AlO(OH) nano colloids were prepared by hydrothermal reaction of the $\gamma-Al_2O_3$ obtained with dehydration of $\gamma$-AlO(OH) and dilute $CH_3COOH$ solution. In hydrothermal reaction process, reversible reaction was accompanied between $\gamma-Al_2O_3$ and AlO(OH), and hydrothermal reaction temperature, hydrothermal reaction time and $CH_3COOH$ concentration had an effect on the crystal structure, surface chemical property, surface area, pore characteristics and crystal morphology of the AlO(OH) nano colloid particles. In this study, it was investigated to the hydrothermal reaction condition of the AlO(OH) nano colloid for using catalyst support, heat resisting agent, adsorbents, binder, polishing agent and coating agent. The crystal structure, surface area, pore volume and pore size of the platelet AlO(OH) nano colloids were investigated by XRD, TEM, TG/DTA, FT-IR and $N_2$ BET method in liquid nitrogen temperature.

• 한국식품영양학회지
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• 제24권4호
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• pp.670-679
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• 2011

This study investigated the hotel buffet restaurant's service quality, emotional reaction of customer, recommendation intention, and defection intention. The survey was conducted from January 3 to February 7 in 2011, and 400 respondents were used in the data analysis. As a results of this study, the hotel buffet restaurant's service quality was classified by the interaction, outcome, and physical environment quality. The emotional reaction of hotel buffet restaurant's customer was classified by the positive and negative emotion. The all factors of hotel buffet restaurant's service quality had a positive impact on positive emotion, while it had a negative impact on negative emotion. The positive emotion reaction of hotel buffet restaurant's customer had a positive impact on the recommendation intention, while the negative emotion had a negative impact on the recommendation intention. And the negative emotion had a positive impact on the defection intention in hotel buffet restaurants. In addition, there were partially differences in the service quality and emotional reaction by general characteristics. There were significant differences in the recommendation intention by marriage status and monthly income. Therefore, the hotel buffet restaurants have to design a strategy of service for increasing customer's positive emotion and recommendation intention.

• 공업화학
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• 제8권5호
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• pp.872-879
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• 1997

암모니아와 금속염과의 기-고 반응을 이용한 화학열펌프에서 열전달 특성과 물질전달 특성을 개선하기 위하여 금속염을 팽창흑연에 반지름 방향으로 겉보기 밀도가 증가하도록 함침시켜 새로운 비균일 열전도성 반응블럭을 제조하였다. 이것은 겉보기 밀도가 반지름 방향으로 165, 222, 279, 337, $394(kg/m^3)$로 증가하도록 만든 것으로 균일 열전도성 반응블럭과 반응특성을 비교하였다. 실험결과 열전달특성은 비균일 열전도성 반응블럭이 훨씬 좋았고, 반응을 반복함에 따라 물질전달과 반응특성이 개선되었으며 반응의 재현성도 양호함을 알 수 있었다.

• 한국환경보건학회:학술대회논문집
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• 한국환경보건학회 2003년도 Challenges and Achievements in Environmental Health
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• pp.123-127
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• 2003

This experiment was performed to investigate the characteristics of sonolytic reaction as the basic data for development of the ultrasonic AOP(Advanced Oxidation Process) process from which the refractory organic compounds in aqueous solution which are not readily removed by the existing conventional wastewater treatment processes can be destructed and removed. Trichloroethylene (TCE), benzene, and 2,4-dichlorophenol(DCP) were used as the samples, and their destruction efficiency were measured in terms of experimental parameters of the initial solution concentration, initial solution pH, reaction temperature, acoustic frequencies and intensities. Results showed that the destruction efficiencies of all of the sample materials were above 80% within 120 minutes of sonolytic reaction in all reaction condition. The reaction order of these three compounds was verified as Pseudo first order. From the fore-mentioned results, it can be concluded that the refractory organic compounds could be removed by the ultrasonic irradiation with radicals, such as H$.$and OH$.$causing the high increase of pressure and temperature. Finally, it appears that the new AOP technology using ultrasonic irradiation can be applied to the treatment of refractory substances which are difficult to be decomposed by the conventional methods.

• 신재생에너지
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• 제5권2호
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• pp.9-14
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• 2009

Automobile Shredder Residue (ASR) is very appropriate in a gasification melting system. Gasification melting system, because of high reaction temperature over than $1,350^{\circ}C$, can reduce harmful materials. To use the gasification processes for hydrogen production, the high concentration of CO in syngas must be converted into hydrogen gas by using water gas shift reaction. In this study, the characteristics of shift reaction of the high temperature catalyst (KATALCO 71-5M) and the low temperature catalyst (KATALCO 83-3X) in the fixed - bed reactor has been determined by using simulation gas which is equal with the syngas composition of gasification melting process. The carbon monoxide composition has been decreased as the WGS reaction temperature has increased. And the occurrence quantity of the hydrogen and the carbon dioxide increased. When using the high temperature catalyst, the carbon monoxide conversion ratio ($1-CO_{out}/CO_{in}$) rose up to 95.8 from 55.6. Compared with average conversion ratio from the identical synthesis gas composition, the low temperature catalyst was better than the high temperature catalyst.