• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1996년도 추계학술대회 논문집
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• pp.401-404
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• 1996

Optical absorption were performed on LB films of binary mixtures of three kinds of merocyanine dyes [DO], [DS], and [6Me-DS], where [DS] and [6Me-DS] from J-like aggregates but not [DO] in single component films. The observed optical absorption spectra of mixed films were markedly dependent on the combination of dyes. [DS]$_{1-x}$ [DO]$_{x}$ LB films show a sharp red shift J-like band peak in the while concentration range. We found the formation of J-aggregates in a mixed merocyanine dyes containing a non J-aggregate forming dye [DO], in a single component case. Further investigations on the present and other mixed dye films will be needed to clarify these points.ts.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.92-93
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• 2020

In this study, the analysis was conducted in the aspect of non-hardened concrete of Ternary Mixed Aggregates, and it was determined that flowing and amount of air increased as the mixing combinations of RS increased. However, it is difficult to see the phenomenon only as a result of increasing mixing combinations of RS, and it is thought that the influence of CS and SS also plays a large role. For later analysis, we plan to conduct research on compressive strength and shrinkage according to age, and analyze more suitable mixing combinations.

• Industrial Engineering and Management Systems
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• 제13권4호
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• pp.369-382
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• 2014

This paper introduces a new multi-product multi-period multi-objective aggregate production planning problem. The proposed problem is modeled using multi-objective mixed-integer mathematical programming. Three objective functions, including minimizing total cost, maximizing customer services level, and maximizing the quality of end-product, are considered, simultaneously. Several constraints such as quantity of production, available time, work force levels, inventory levels, backordering levels, machine capacity, warehouse space and available budget are also considered. Some parameters of the proposed model are assumed to be qualitative and modeled using fuzzy sets. Then, a fuzzy goal programming approach is proposed to solve the model. The proposed approach is applied on a real-world industrial case study of a color and resin production company called Teiph-Saipa. The approach is coded using LINGO software. The efficacy and applicability of the proposed approach are illustrated in the case study. The results of proposed approach are compared with those of the existing experimental methods used in the company. The relative dominance of the proposed approach is revealed in comparison with the experimental method. Finally, a data dictionary, including the way of gathering data for running the model, is proposed in order to facilitate the re-implementation of the model for future development and case studies.

• Journal of Microbiology and Biotechnology
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• 제20권2호
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• pp.325-331
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• 2010

Rhodococcus erythropolis amidase was expressed in Escherichia coli cells. The crude amidase in the cell-free extract was immobilized using the cross-linked enzyme aggregate (CLEA) method. The crude amidase was mixed with bovine serum albumin and then precipitated with ammonium sulfate. The resultant precipitant was subsequently cross-linked with glutaraldehyde. Scanning electron microscopy revealed that this co-CLEA had a ball-like shape with a diameter of approximately $1\;{\mu}m$. This co-CLEA evidenced hydrolytic activity toward a variety of amide substrates. The amidase co-CLEA evidenced an optimum temperature of $60^{\circ}C$ and an optimum pH of 8.0, results that were similar to those of the soluble amidase. The reaction stability of the co-CLEA was increased. That is, it was stable up to $50^{\circ}C$ and in a pH range of 5.0-12.0. Additionally, the co-CLEA could be recovered by centrifugation, and retained 96% activity after 3 repeated cycles. This amidase co-CLEA may prove useful as a substitute for soluble amidase as a biocatalyst in the pharmaceutical and chemical industries.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 춘계 학술논문 발표대회
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• pp.77-79
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• 2012

This study is to assess the differences between concrete having only one of fine aggregates such as crushed fine aggregates, sea sand and blast furnace slag in it and concrete having mixture of two kinds of those fine aggregates in it in order to find out how to deal with the lack of some aggregates. The findings are as follows. In terms of slump, the concrete containing sea sand and blast furnace slag has very low slump values while the concrete having the mixture of crushed fine aggregate and the other fine aggregates showed better workability. In terms of compressive strength, the concrete containing the mixture of two kinds of aggregates showed higher compressive strength. Accordingly, it is likely that the concrete containing the mixture of crushed fine aggregate, sea sand and blast furnace slag is better than the concrete with only one kind of fine aggregates in terms of the usability.

• 환경영향평가
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• 제22권5호
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• pp.427-437
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• 2013

Generation rate of construction wastes in Korea has occupied preponderantly in recent years. To understand chemical properties of recycled concrete aggregate (RCA), RCA samples were tested for their leaching characteristics. Leaching tests were conducted according to Korean Standard Leaching Test (KLT) and Toxicity Characteristics Leaching Procedure (TCLP) respectively. The RCA samples were characterized using X-ray fluorescence (XRF). Alkalinity of the leachate was determined using a pH meter titration method. The XRF analysis result shows that the calcium oxide (CaO) content in the RCA sample is 25.3~50.4 %. When the RCA sample was mixed with water in a batch reactor, pH in the solution was rapidly increased, and 70% of the total pH change was found in 1 hour. The TCLP showed slightly higher efficiency for leaching heavy metals than the KLT. The leaching efficiency was also higher as the particle size of RCA sample was smaller. The leaching test results suggest that RCA can be generally classified as nonhazardous waste.

• 한국건설순환자원학회논문집
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• 제4권2호
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• pp.118-124
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• 2016

본 연구는 단열성능 향상 재료의 타입별 단열콘크리트의 레올로지 특성을 분석하여 최적 유동설계 및 펌핑해석을 위한 기초자료로 활용하고자 하였다. 그 결과 경량골재 혼입시 항복응력이 큰 폭으로 감소한 것으로 나타났으며, 2 type의 경우 마이크로기포제 (MFA) + 규조토 미분말(DM)의 조합이 가장 이상적인 유동특성을 나타내었다. 또한 3 type의 경우 마이크로기포제(MFA) + 규조토 미분말(DM) + 경량골재(L)의 조합이 가장 우수한 유동특성을 나타내었다.

• 한국방재학회 논문집
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• 제9권3호
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• pp.1-7
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• 2009

순환골재를 도로의 기층재료나 보조기층용 골재로 활용하기 위하여 1980년대 초부터 미국과 유럽의 여러 나라에서 연구가 진행되었다. 우리나라에서도 1990년대 도심지 재개발 및 아파트 재건축의 증가로 건축폐기물이 다량으로 발생하여 이에 대한 대책을 마련하기 위한 방안으로 재활용 논의가 있었으나 실용화되지 못하였고 1994년 자원의 절약과 재활용 촉진에 관한 법률이 제정되어 일정 공사금액 이상의 건설사업자가 건설현장에서 배출되는 건설폐자재를 재활용화 하도록 규정한 이후에 구조물 채움재나 도로의 보조 기층재, 성토 및 복토용으로 활용되다가 최근에 포장재료로 활용하기 위한 연구가 수행되고 있다. 건설폐자재의 활용은 자원재활용과 함께 자연환경을 보호하고 부족한 골재난을 해소할 수 있으며 양질의 재료를 이용하여 포장의 공용성을 확보할 수 있어 여러 측면에서 효과적이다. 본 연구에서는 순환골재를 이용하여 자원을 재활용하고 에너지 소비를 절감 할 수 있는 상온 재생 아스팔트 혼합물 개발을 위한 연구 수행결과를 정리 하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기물성,응용부문
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• pp.128-130
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• 2001

In this study, we investigate the deposition characteristics of merocyanine dye(MD) Langmuir-Blodgett(LB) film using quartz crystal microbalance (QCM). The MD optical system mixed with fatty acid was fabricated using LB method. And their optical characteristics were investigated using UV spectroscopy. The optical behavior of MD LB film was investigated asto thermal treatment. The resonant frequency and admittance was measured during dissociation of J-aggregate of MD LB film. As a result, it has been suggested that the J-aggregate dissociation in MD LB film by thermal treatment give rise to transformation of oscillation characteristics of quartz crystal.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.549-554
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• 2002

In Powder System, SCC demands high dosage of superplasticizer and a lage amout of powder for suitable fluidity and viscosity. Okamura's method of most representative mixing design method in SCC of Powder-System is unfavorable economically because of using a large amount of powder. In addition, many ready-mixed concrete plants do not use his mix design method and procedure due to complexity for practical application. Therefore, Nan Su proposed more simple mix design method than Okamura's. It had an advantage in simplicity in practical application and required a smaller amount of powders compared with Okamura's method. This paper proposed an optimal mixture proportion of SCC with consideration of Nan Su's method. The new and modified mix design method required a smaller amount of powder than that of Nan Su's. To check the properties of SCC, considered with the requirements specified by the Japanese Society of Civil Engineering.(JSCE)