• 한국터널지하공간학회 논문집
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• 제15권2호
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• pp.149-160
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• 2013

숏크리트의 배합에 스크리닝스를 활용하는 기술이 친환경적인 측면에서 필요할것으로 분석되었다. 따라서, 스크리닝스의 재활용은 단순히 폐자재의 활용에 의미가 있는 것뿐만 아니라, 최근의 양질 모래 부족으로 인한 품질저하를 극복하는 방안이 될 수 있다. 본 연구에서는, 숏크리트용 혼합골재로서 스크리닝스의 활용성을 평가하고자 5개 지역별 스크리닝스에 대한 물리적인 특성과 스크리닝스를 혼합한 잔골재의 물리적인 특성, 그리고 숏크리트용 혼합골재의 입도분포에 미치는 영향을 분석하여 스크리닝스의 종류에 따른 최대 혼입량을 산정하였다.

• Journal of the Korean Wood Science and Technology
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• 제48권2호
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• pp.181-195
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• 2020

본 연구는 평로탄화로 이용한 성형목탄 제조과정에서 얻은 탄화된 바이오매스의 특성을 분석하였으며, 기계적 전처리 및 평로탄화로 내 위치에 따른 특성 차이를 비교하고자 하였다. 성형목탄 제조업체에서 채취된 바이오매스 1종과 탄화 바이오매스 5종의 시료를 대상으로 선별(screening) 및 분쇄(grinding)를 통해 분석시료의 입자크기 범위별로 분류한 후, 고정탄소, 회분, 휘발성 화합물, 원소 함량, 발열량을 측정하였다. 실험 결과, 평로탄화로의 위치에 따라서는 중간층의 탄화 바이오매스 발열량이 20.4 MJ/kg으로 가장 높은 연료적 특성을 나타내었다. 선별 입자 크기에 따라서는 100 mesh 이하의 탄화 바이오매스에서 회분함량이 가장 낮았고 발열량, 탄소 함량, 고정탄소 함량은 높았다. 상관관계 분석 결과 회분 함량은 발열량, 휘발성화합물, 고정탄소, 탄소 함량과 모두 음의 상관관계를 나타내어 회분 함량이 연료적 특성에 부정적인 영향을 미치는 것을 확인하였다.

• Fisheries and Aquatic Sciences
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• 제13권2호
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• pp.133-139
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• 2010

The effects of suspended solids size on culture water quality were determined in a commercial recirculating aquaculture system (RAS) for Japanese eel, Anguilla japonica. The particulate phase of the culture water was serially divided into six size fractions using 300, 200, 100, 75, 45, and 26 ${\mu}m$ pore size stainless sieves. The total, dissolved, and particulate nitrogen and phosphorus, and suspended solids for each fraction were determined. The concentration ranges in the fractions were: total nitrogen, 164-148 mg $L^{-1}$; total phosphorus, 20.4-15.5 mg $L^{-1}$; and total suspended solids, 8.1-6.1 mg $L^{-1}$. The concentration of total nitrogen and total phosphorus decreased significantly (P<0.05) with a 26 ${\mu}m$ and 200 ${\mu}m$ filter pore size, respectively. Nutrients from dissolved organic substances were much higher than from particulates. Analysis of particle size fractionation and its effects on water quality is useful to estimate removal efficiencies of a commercial effluent screening device for solid management and development of solid removal systems.

• 전기학회논문지
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• 제58권9호
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• pp.1658-1666
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• 2009

This paper proposes an approach of Mult_HPSO based on the PC cluster system to reduce or remove the stagnation on an early convergence effect of PSO, reduce an execution time and improve a search ability on an optimal solution. Hybrid PSO(HPSO) is combines the PSO(Particle Swarm Optimization) with the mutation of conventional GA(Genetic Algorithm). The conventional PSO has operated a search process in a single swarm. However, Multi_PSO operates a search process through multiple swarms, which increments diversity of expected solutions and reduces the execution time. Multiple Swarms are composed of unsynchronized PC clusters. We apply to SCED(security constrained economic dispatch) problem, a nonlinear optimization problem, which considers line flow constraints and N-1 line contingency constraints. To consider N-1 line contingency in power system, we have chosen critical line contingency through a process of Screening and Selection based on PI(performace Index). We have applied to IEEE 118 bus system for verifying a usefulness of the proposed approaches.

• 한국지하수토양환경학회지:지하수토양환경
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• 제16권1호
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• pp.71-81
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• 2011

Cause of contamination in the study area nearby Jang Hang Refinery is dust scattering in refinery stack, and soil washing treatment is one of the proper technologies for soil remediation in this area. Site conditions frequently limit the selection of a treatment process. A treatment technology may be eliminated based on the soil classification or physicochemical characteristics of soil. This study was assessed the soil washing efficiency by conducting of soil characteristic analysis in the vicinity of Jang Hang Refinery Stack within a 2 km radius. Also, it was decided about remedial range with comparative analysis of As in soil by Korean Standard Test Method before/after revision, whereupon As concentration in soil showed a increasing tendency after revision. As a result, the soil washing using the size separation of soil was determined through identifying of As species in the soil. In this site, only particle size distribution and water content of soil can provide the initial means of screening for the potential use of soil washing.

• 한국의학물리학회지:의학물리
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• 제9권1호
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• pp.37-46
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• 1998

Beta-particle energy distributions of the radionuclides in medicine are calculated for the medical physics applications. The radial component solutions of Dirac wave equations are evaluated for a point-nucleus un screened Coulomb potential. The WKB method is employed to correct the screening due to the orbital-electron cloud. Fierz interference terms are ignored. The radionuclides considered are $\^$32/P, $\^$90/Y, $\^$131/I, $\^$166/Ho, $\^$192/Ir, $\^$198/Au, $\^$153/Sm, $\^$169/Er and $\^$188/Re. A total of 9 beta-spectra for the radionuclides, currently in domestic use or potential use in the near future, are calculated with enough accuracy and presented in graphs and tables.

• 한국기계가공학회지
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• 제13권2호
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• pp.35-40
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• 2014

Wire drawing is aplastic deformation process that produces a wire with a desired diameter by pulling the end of the wire through a die. During the cold wire drawing process, the temperature between the wire and the die bearing is increased. This temperature increase causesenergy consumption increase, bad wire quality, and decreased die life. To reduce friction and avoid high temperature between the wire and the die in the cold wire drawing process, a dry lubricant with soap particles is used. It is not possible to reused the lubricant onceiron oxide is attached to the soap particlesat high pressure die. In this study, recycling technologies for wasted soap particles with processes of crushing, separation, and screening are developed. From the evaluation, the recycling efficiency was found to be 86.97%.

• 생명과학회지
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• 제13권4호
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• pp.541-550
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• 2003

본 실험에서는 C형 간염바이러스 (HCV)의 외피 단백질인 E2 당단백질에 결합하는 세포단백질들을 클로닝하기 위해 간세포 cDNA를 phage 표면에 발현시킨 phage library를 제작하였고, 12-mer peptide library와 함께 E2 단백질에 대해 panning을 실시하였다. 검색결과 세포내 신호전달과 cytoskeleton 구성에 관여하는 tensin, membrane protein band 4.1 등 세포질내 단백질과 CCR7, CKR-L2, insulin-like growth factor-1 receptor 등 세포막 단백질 등이 확인되었다. 이들 단백질들을 발현하는 phage들은 수용성 E2단백질을 이용한 결합중화반응 결과 E2 단백질에 특이적으로 결합함이 확인되었다. 사람 T 세포에서 주로 발현되는 CCR7 유전자를 PHA로 활성화된 사람 T 세포의 total RNA를 이용하여 증폭하고 클로닝하였다. 293T 세포에 transfection시켜 단백질 발현양상을 flow cytometer로 분석하여 70% 이상의 세포들이 CCR7을 발현하고 있음을 관찰하였다. 수용성 E2 단백질을 CCR7이 transfection된 세포와 mock transfection된 대조군 세포에 각각 반응시킨 결과 dose-dependent 양상으로 CCR7에 결합하였다.

• 한국가시화정보학회지
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• 제20권3호
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• pp.136-145
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• 2022

Later flow immunoassay (LFIA) is a protein analytical method based on immunoreaction. On the LFIA based protein analytical method, bioreceptor molecule plays a key role, and so a system that evaluates and manages the binding affinity of bioreceptor is needed to secure detection reliability. In this study, Lateral Flow Immunoassay based rapid Bioreceptor Screening Method (rBSM) is presented that provide a simple and quick evaluating method for the binding affinity to the target protein of the antibody as model bioreceptor. To verify this evaluation method, Virus-like particles (VLP) and anti-VLP antibodies are selected as a model norovirus, which is target protein, and the candidate bioreceptors respectively. Among the 5 different candidate antibodies, appropriate antibody could be sorted out within 30 minutes through rBSM. In addition, selected antibodies were applied to two representative LFIA based techniques, sandwich assay and competitive assay. Among these methods, sandwich assay showed more effective VLP detection method. Through applying selected antibodies and techniques to the commercialized mass production lines, an VLP detecting LFIA kit was developed with a detection limit of 10¹² copies/g of VLPs in real samples. Since this proposed method in this study could be easily transformable into other combinations with bioreceptors, it is expected that this technique would be applied to LFIA kit development system and bioreceptor quality management.

• Journal of Radiation Protection and Research
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• 제48권3호
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• pp.131-143
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• 2023

Background: This study examined the detection limit of thyroid screening monitoring conducted at the time of the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident in 2011 using a Monte Carlo simulation. Materials and Methods: We calculated the detection limit of a NaI(Tl) survey meter to measure ¹³¹I accumulation in the thyroid gland of children. Mathematical phantoms of 1- and 5-year-old children were developed in the simulation of the Particle and Heavy Ion Transport code System code. Contamination of the body surface with eight radionuclides found after the FDNPP accident was assumed to have been deposited on the neck and shoulder area. Results and Discussion: The detection limit was calculated as a function of ambient dose rate. In the case of 40 Bq/cm² contamination on the body surface of the neck, the present simulations showed that residual thyroid radioactivity corresponding to thyroid dose of 100 mSv can be detected within 21 days after intake at the ambient dose rate of 0.2 µSv/hr and within 11 days in the case of 2.0 µSv/hr. When a time constant of 10 seconds was used at the dose rate of 0.2 µSv/hr, the estimated survey meter output error was 5%. Evaluation of the effect of individual differences in the location of the thyroid gland confirmed that the measured value would decrease by approximately 6% for a height difference of ±1 cm and increase by approximately 65% for a depth of 1 cm. Conclusion: In the event of a nuclear disaster, simple measurements carried out using a NaI(Tl) scintillation survey meter remain effective for assessing ¹³¹I intake. However, it should be noted that the presence of short-half-life radioactive materials on the body surface affects the detection limit.