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이광섭,이진영,김성돈,김전수,박장현,이만승,Lee Gwang-Seop,Lee Jin-Young,Kim Sung-Don,Kim Joon-Soo,Park Jang-Hyun,Lee Man-Seung 한국자원리싸이클링학회 2004 資源 리싸이클링 Vol.13 No.2
염산용액에서 PC88A에 의한 Gd추출반응의 평형을 해석하기 위해 화학반응, 상평형, 물질수지 및 전기적중성식을 고려하였다. 본 연구의 실험조건에서 PC88A에 의한 Gd의 추출반응에 대해 다음의 반응식과 평형상수를 얻었다. $Gd^{3+}$ $+2H_2$$A_2$,$or=GdA_3$HA.or+3$ H^{+/}$ , K=3.3 Gd의 초기농도와 pH로부터 염소의 초기농도를 구하는 방법을 제시했고, Gd과 염산농도에 따른 Gd 착물의 농도분포를 구했다. 본 연구에서 구한 Gd 추출반응의 평형상수와 이온평형을 초기 추출조건에 적용하여 예측한 Gd의 분배계수와 측정값은 서로 잘 일치하였다. Solvent extraction equilibria of Gd with PC88A from chloride solutions were analyzed by considering chemical equilibria. phase equilibria, mass and charge balance equations. The following solvent extraction reaction and equilibrium constant were evaluated from the experimental data performed in this study. $Gd^{3+}$ $+2H_2$$A_2$,$or=GdA_3$HA.or+3 $H^{+}$ , K=3.3 A procedure was suggested to calculate the initial concentration of chloride ion from initial pH and initial concentration of Gd. By applying ionic equilibria, the distribution of Gd complexes with Gd and HCl concentration was obtained. The predicted distribution coefficients of Gd agreed well with the experimental results.
이광섭,이진영,김성돈,김준수,이만승,Lee Gwang-Seop,Lee Jin-Young,Kim Sung-Don,Kim Joon-Soo,Lee Man-Seung 한국자원리싸이클링학회 2004 資源 리싸이클링 Vol.13 No.4
염산용액에서 PC88A에 의한 Nd의 용매추출에 관한 연구를 하였다. 추출조건과 실험결과에 이온평형을 적용하여 Nd과 PC88A의 추출반응식 및 평형상수 값을 얻었다. $Nd_{aq}$ $^{ 3+}$ + $1.5H_2$$A_2$,org = $NdA_3$,org + 3H/sun $aq^{+}$ , K=0.25 본 연구에서 구한 Nd의 추출반응의 평형상수를 초기 추출조건에 적용하여 예측한 Nd 분배계수와 측정값은 서로 잘 일치하였다. PC88A의 비누화가 Nd의 추출 및 평형 pH 변화에 미치는 영향을 조사하였다. 비누화된 PC88A는 단위체로 추출반응에 참여하여 Nd의 추출율을 증가시켰다. 수상의 초기 pH에 대한 평형 pH의 변화는 Nd과 PC88A의 초기농도비에 크게 의존했다. Solvent extraction experiments of Nd from chloride solution were studied with PC88A. Solvent extraction reaction of Nd with PC88A and the equilibrium constant were evaluated from the extraction experimental data and extraction conditions. Nd$aq^{3+}$ + 1.5 $H_2$$A_2$,org = $NdA_3$,org + 3H/sun $aq^{+}$ , K=0.25 The predicted distribution coefficients of Nd agreed well with the experimental results. The effect of saponification of PC88A on the extraction of Nd and on the change of equilibrium pH was investigated. Saponified PC88A present as a monomer in the organic reaction and enhanced the distribution coefficient of Nd. The initial extraction conditions had a great effect on the equilibrium pH.
진교(秦?, Gentianae Macrophyllae Radix)의 품질표준화에 관한 연구
이광섭,이승재,김호현,진희억,함인혜,황완균,Lee, Kwang-Sup,Lee, Seung-Jae,Kim, Ho-Hyun,Jin, Hee-Ouk,Ham, In-Hye,Whang, Wan-Kyunn 한국생약학회 2001 생약학회지 Vol.32 No.4
The Radix of Gentiana macrophylla (Gentianaceae) has been used for dispelling wind-damp, relaxing the sinews, and clearing heat from deficiency. In order to evaluate its quality, the method for the quantitative determination of gentiopicroside as standard compound has been developed. Gentiopicroside was a major compound of Gentianae Macrophyllae Radix. It was analyzed by HPLC using 30% MeOH as a solvent system. The amount of gentiopicroside from Gentianae Macrophyllae Radix was in the range of $2.22{\pm}1.22%\;(n=18)$.
공동주택 리모델링 사례조사를 통한 수익성 영향요인 분석
이광섭,김기현,김경래,신동우,Lee, Kwang-Seob,Kim, Ki-Hyun,Kim, Kyung-Rai,Shin, Dong-Woo 한국건설관리학회 2007 건설관리 : 한국건설관리학회 학회지 Vol.8 No.2
Markets for the apartment remodeling projects will be a major portion of the construction industry in near future. However, only partial remodeling works in the apartment were done so far. This situation caused bad impact to expand the remodeling markets and less profits of the remodeling projects. In order to solve this problem, many other researches were done previously to Improve profits of the apartment remodeling projects. However, the results are too theoretical to implement them and Improve profits. In this research, profitability influence factors that are possible to improve effect of the remodeling works are selected and analyzed through several studies. Then, correlation analysis is performed between the improvement level in the remodeling projects and the numerical profitability based on actual cases. The result clearly shows that some improved remodeling items are strongly related to the profit. These results lead us to the strategy to follow for the purpose of increasing profits of the remodeling projects. 공동주택의 리모델링 사업은 장기적으로 가장 비중이 크고 중요한 리모델링 시장의 한 분야라고 할 수 있으나, 아직까지는 세대 내부 인테리어 또는 국소부위 리모델링 수준에 머무르며 수익성 향상측면과는 거리가 있는 사업으로 인식되고 있어, 리모델링 사업의 활성화 방향에 저해 요소로 작용하고 있다. 기존 연구에서는 이와 같은 문제점을 해결하기 위하여 거주자 및 전문가의 항목별 우선순위에 대한 많은 연구가 진행되었으나, 이는 사업 이후의 평가 즉, 실제 리모델링 사업 이후의 Feedback을 통한 리모델링 사업의 수익성 향상 측면의 재고라기보다는 이론적 선행연구에 그치고 있다. 이에 본 연구는 선행 연구 및 문헌조사를 통해서 리모델링 사업의 수익성에 영향을 미치는 인자 Pool을 도출하고, 다수의 실제 공동주택 리모델링 사례를 바탕으로 리모델링 부문의 개선수준과 실제적 발생 수익과의 상관분석을 통하여 각 세부요인들의 개선수준이 수익성에 미치는 상관관계를 정량적인 수치로 도출하고 결과 값을 해석하여, 이를 바탕으로 기존 리모델링 사례에 대한 문제점을 재조명함과 동시에 향후 리모델링 사업의 방향 설정에 참고가 될 수 있도록 함에 그 목적이 있다.
염화팔미토일의 기상 그라프트 반응에 의한 PVA 코팅층의 소수화 효율 분석
이광섭(Kwang-Seob Lee),이재훈(Jae-Hun Lee),이명구(Myoung-Ku Lee),류정용(Jeong-Yong Ryu) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.4
Gas grafting of cellulose with fatty acid chloride based on chromatogenic chemistry is an effective method which can provide paper with hydrophobic characteristic. In case of gas grafting with fatty acid chloride, various reaction parameters such as concentration of fatty acid chloride, reaction temperature, and reaction time are very important for the optimization of the gas grafting of cellulose. In this study the gas grafting efficiency of PVA (polyvinyl alcohol) coated paper at the various conditions was evaluated by measuring water resistance such as Cobb1,800 size and water contact angle. Also quantitative analysis was performed for determining reacted or un reacted fatty acid chloride by using ATR spectroscopy and GC. As a result, when the content of palmitoyl chloride esterified with a hydroxyl group at 1% concentration of palmitoyl chloride and 180℃ of react temperature was less than 1 g/㎡, Cobb1,800 size degree was less than 10 g/㎡. And it was found that Cobb1,800 size value, water contact angle, ratios of absorption peak of 1,735 cm<SUP>-1</SUP>/3,300 cm-1, amount of grafted fatty acid was improved with increase in concentration of palmitoyl chloride, temperature, and reaction time. And there was good correlation between GC analysis, ATR spectroscopy analysis and Cobb1,800 sizing degree for evaluation of the grafting efficiency. It should be noted that only water contact angle could not be used to evaluate the grafting efficiency.
분무방식에 의한 NFC(Nano-Fibrillated Cellulose)의 제지공정 적용 방안 탐색 연구
이광섭(Kwang Seob Lee),김창근(Chang Geun Kim),이재훈(Jae Hoon Lee),이태주(Tai Ju Lee),류정용(Jeong Yong Ryu) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.4
In recent years, it had focused on the improvement of paper properties by addition of NFC (Nano-fibrillated Cellulose). Although the addition of NFC to wet-end of papermaking process could be suggested as a new solution to improve the strength properties of paper, it was not possible to avoid the bad drainage caused by the added NFC’s chocking pores of wet web. Instead of the direct addition to wet-end, spraying of NFC to web in wire-section was tried in this study and evaluated by checking various paper properties including surface smoothness, tensile strength, folding endurance and stiffness. According to the increase of spraying amount of NFC, above mentioned paper properties were enhanced without excessive deterioration of drainage. Compared with direct introduction to wet-end, spraying could be regarded as a more proper method to enhance the surface smoothness and strength properties of paper.