• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.3
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• pp.1488-1494
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• 2011

In this paper, we propose an algorithm using linear regression model that forecasts the demand of heated water in winter. To supply heated water to apartments, stores and office buildings, Korea District Heating Corp.(KDHC) operates boilers including electric power generators. In order to operate facilities generating heated water economically, it is essential to forecast daily demand of heated water with accuracy. Analysis of history data of Kangnam Branch of KDHC in 2006 and 2007 reveals that heated water supply on previous day as well as temperature are the most important factors to forecast the daily demand of heated water. When calculated by the proposed regression model, mean absolute percentage error for the demand of heated water in winter of the year 2006 through 2009 does not exceed 3.87%.

• Journal of Korean Society of Environmental Engineers
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• v.28 no.5
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• pp.487-493
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• 2006

Reductive dechlorination of chlorophenols by nickel coated iron was investigated to understand the feasibility of using Ni/Fe for the in situ remediation of contaminated groundwater. Zero Valent Iron(ZVI) was amended with Ni(II) ions to form bimetal(Ni/Fe). Dechlorination of five chlorophenol compounds and formation of intermediates were examined using Ni/Fe. Rate constant for each reaction pathway was quantified by the numerical integration of a series of differential rate equation. Experimental results showed that the sequence of hydrodechlorination rate constant was in the order of 2-CP>4-CP>2,4-DCP>2,4,6-TCP>2,6-DCP. The hydrodechlorination pathways for the conversion of each chlorophenol compound involves a full dechlorination to phenol via both concerted and stepwise mechanisms. Reaction pathways and corresponding kinetic rate constants were suggested based on the experiments and numerical simulations.

• Journal of Advanced Technology Convergence
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• v.1 no.2
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• pp.19-25
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• 2022

It is intended to evaluate the performance of the shield after manufacturing a shield with cheap and eco-friendly iron oxide and alumina instead of lead, which is a radiation shielding material. After manufacturing the shield by mixing iron oxide and alumina with gypsum, the performance is evaluated by comparing it with gypsum board and lead apron using an X-ray tube. As a result of the experiment, the shielding performance of alumina was lower than that of the gypsum board, and when 50% of alumina was contained, the shielding performance was similar to that of the gypsum board. Iron oxide became similar to the shielding performance of lead apron when it contained about 75%. A shielding material using alumina shows shielding performance similar to that of gypsum, so it is not suitable as a substitute for lead. However, since iron oxide exhibits similar shielding performance to lead, it can be used as an X-ray shielding material to replace lead in the future, so further research is needed.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.429-430
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• 2003

TiO$_2$를 이용한 휘발성 유기화합물(VOCs)의 광촉매적 제게에 관한 연구는 오염된 공기의 정화를 위한 대안적인 산화공정으로서 현재 많은 연구가 진행되어 오고 있다(A. J. Maira et al., 2001; Rosana M. Alberici and Wilson F. Jardim, 1997). 또한 가시광영역, 암반응 및 수분 등의 영향을 최소화하기 위해 금속 성분을 첨가하여 광촉매적 활성을 높이고자 여러 가지 시도들이 행해져 왔다(Akawat Sirisuk et al., 1999; John L. Falconer and Kimberley A. Magrini-Bair, 1998). (중략)

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.9
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• pp.1315-1322
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• 1993

본 연구에서는 헤어핀 공진기를 이용하여 L대역 대역통과 MIC여파기를 설계하였다. 여파기의 크기를 줄이기 위해 헤어핀 공진기 간의 결합을 일반결합 대신에 안쪽견합 또는 혼합결합을 사용할 누 있다. 안쪽결합을 사용한 4개의 공진기로 된 여파기는 일반결합 여파기 보다 크기가 20~30% 감소되었다.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05a
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• pp.163-168
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• 1998

경수로 압력용기의 취화는 주로 고속 중성자에 기인한다. 경수로 압력용기를 모의한 PCA-REPLICA실험을 해석하여 원자력 시설의 구조재로 쓰이는 철의 핵자료 검증과 MATXS/TRANSX/DANTSYS 계산체제의 유용성을 확인하고자 하였다. 라이브러리는 JEF-2.2를 이용한 KAFAX-F22가 기본 자료로 이용되었고, 이밖에 ENDF/B-Vl.1과 JENDI.-3.2의 철 핵자료도 비교 검증하였다. 계산결과는 실험오차 등을 고려하면 측정치와 근접하는 경향을 보였고, 앞으로 개발될 차폐해석용 라이브러리 검증에 유용한 자료가 될 수 있겠다.

• Proceedings of the Korean Fiber Society Conference
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• 2001.10a
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• pp.326-326
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• 2001

Epoxy/glass fiber 복합재는 높은 strength와 stiffness를 갖는 장점이 있지만 impact strained energy를 효율적으로 발산시킬 수 있는 mechanism을 가지고 있지 않기 때문에 damping 능력이 떨어진다 Impact strength와 damping 성능을 증가시키기 위해 사용되어지고 있는 방법은 형상기억 고분자를 이용한 것으로 상대적으로 높은 strength와 impact에 대한 흡수 및 발산을 가지고 있다 형상기억 고분자는 glass transition temperature(G$_{g}$) 근처에서 높은 damping 능력을 가지고 있다. (중략)

• 농업기술회보
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• v.46 no.1
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• pp.34-35
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• 2009

최근 소비자들은 먹을거리의 안전성, 건강 다이어트식품으로 겨울철 간식용뿐만 아니라 맛탕, 고구마밥, 튀김 등 요리에도 이용되고 있는 고구마를 선호한다. 그러나 고구마는 수분이 많고 저온에 노출되면 냉해를 받아 부패하게 되므로 저장관리가 까다롭다. 수확 후 저장관리를 잘한다면 수확 직후부터 이듬해 7월 중 하순, 햇고구마가 출하될 때까지 연중 공급이 가능하다.

• 한국ITS학회:학술대회논문집
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• 2010.05a
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• pp.96-97
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• 2010

• 대한핵의학회:학술대회논문집
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• 1989.06a
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• pp.120.1-120.1
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• 1989