• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.100-101
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• 2016

The fineness degree of Ordinary Portland Cement (OPC henceforth) usually used in Korea's construction sites, is designated as over 2,800㎠/g. But the higher the fineness, the surface area of hydration reaction on water increases as well, resulting in large early age strength and high-intensity; so the trend is to prefer a high degree of fineness. But from a pore-space filling perspective, fine-particled cement is not always beneficial to intensity. Therefore in this study artificial modifications were given to cement fineness to analyze the effect of various fineness changes on the liquidity, air quantity and intensity of lean mixture cement mortar. As a result, the greater the degree of fineness, the better the cement was, with fine particle+OPC having the most satisfactory results due to consecutive particle distribution.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.102-103
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• 2016

Recently on construction sites, there is increased use of concrete with large quantities of blast-furnace slag(BS) admixture replacements, for purposes of reducing CO2 created from cement, one of the ingredients of concrete. But such high-BS fineness changes can have a huge effect on the quality of mortar and concrete. Therefore in this study an experiment was conducted in which liquidity and intensity of mortar depending on an artificially-applied change in fineness degree at degree 7. The results, though subtle, were that the larger the fineness degree, liquidity increased and air quantity decreased, and compression and flexural strength increased.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.45-46
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• 2016

As coal fly ash emissions have increased due to additional constructions of domestic heat power plants, the amount of embedded reject ash (Rj henceforth) is increasing as well. Most Rj is embedded, so if it is used as an alternative admixture instead of cement, embedded quantities will decrease, leading to economic and environmentally positive effects. Therefore this study conducted an experiment to contemplate the usability of Rj ground in the Los Angeles abraser, and what effects ground Rj has on the engineering properties of high compressive strength mortar. The result was that as the number of grinding turns increased, liquidity, air quantity and intensity were improved, proving Rj a possible alternative admixture to cement.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.54-55
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• 2016

Recently in the construction industry, industrial by-product admixtures like blast-furnace slag fine particles (BS henceforth) are being used as binding material, reducing the use of cement, and measures to reduce CO₂ emissions are being examined on various levels. However, the BS being used domestically varies depending on the origin of resources, and by circulating BS that is inappropriate to the KS standard, problems are occurring in terms of changes and declines in the quality of concrete which uses it. Therefore in this study the liquid densimeter principle was used to assess various BS fineness qualities; with 100 g/L fixed, a 1,000cc mass cylinder was most appropriate for assessing the quality of cement fineness.

• 한국진공학회:학술대회논문집
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• 한국진공학회 1996년도 제10회 학술발표회 논문개요집
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• pp.21-22
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• 1996

• 소성∙가공
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• 제25권4호
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• pp.242-247
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• 2016

CFD simulation with FlowVision^® is used to evaluate the capability of cooling channel in hot press forming dies. Two different types of cooling channels, dry drilled and pocket types are considered for comparison. Two different approaches for simulating cooling channel are considered. One is single-phase velocity calculation for coolant only and the other is multiphase thermal and velocity calculation for die, blank and coolant all together. Both approaches show better cooling performance in pocket type cooling channel. Also both approaches show their own effectiveness in designing cooling channel of hot press forming dies.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2010년도 춘계학술발표논문집 2부
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• pp.1049-1052
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• 2010

생산성 및 품질혁신을 위하여 Lean 6시그마에 대한 다양한 국외 적용사례는 존재하나, 고도의 하이테크 산업이며 품질을 최우선으로 삼는 항공산업에 적용 및 평가에 대한 국내 연구사례는 거의 전무한 것이 현실이다. 본 연구에서는 린 6시그마 기법이나 사상들이 국내 항공산업 프로세스의 생산성 및 품질을 향상시키는데 과연 적합한지 판단하여, 현장적용을 사례로 적용 방법론을 제안하는데 목적이 있다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2011년도 한국컴퓨터종합학술대회논문집 Vol.38 No.1(C)
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• pp.462-465
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• 2011

웹 애플리케이션의 사용이 늘어남에 따라 자바스크립트 프로그램의 성능을 높이는 것이 중요한 문제가 되었다. 자바스크립 프로그램에 대해 별칭 분석을 수행하면 더 많은 최적화가 가능해지지만, 자비스크립트가 가지는 동적인 특성으로 인해 분석 방법을 고안하는 데 어려움이 있었다. 본 논문에서는 자바스크립트의 주요한 동적 특성을 온전하게 다루는 별칭 분석 알고리즘을 최초로 제안한다. 제안한 방법은 별칭 그래프를 생성하여 프로그램 내의 별칭 관계를 완전하게 찾아내며, 또한 실행시킬 코드가 동적으로 추가될 때마다 이전에 이루어졌던 최적화가 유효한지 검사한다. 별칭 분석 결과를 이용하여 V8 자바스크립트 엔진에서 추가적으로 최적화를 수행한 결과, 유의미한 수행 시간 감소를 확인할 수 있었다.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 2011년도 추계학술논문발표회 논문집
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• pp.518-521
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• 2011

본 논문에서는 화재 및 비화재보시 동작감지기의 정확한 위치전송이 가능하고, 화재 시 동일 회로상(Loop)의 모든 감지기가 본연의 기능을 수행할 수 있는 주소형 감지기 및 화재 시 정확한 위치확인 및 연동된 설비들의 출력상황이 확인 가능한 임베디드 내장형 주소형 수신기를 개발하였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 춘계 학술논문 발표대회
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• pp.87-88
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• 2018

The change in the degree of powder in cement is very important because it plays a major role in the reaction in the concrete. In this study, we intend to apply the principle of early estimation of concrete strength using the non-middling method previously conducted to the quality evaluation of cement powder. In other words, it is proposed to analyze the potential of Hydrometer density values and the data of temperature variation in the trust solution to propose a method of acceptance inspection. According to the experimental results, the quick evaluation of the cement distributorship will be possible if the resulting regression results are used : y = 161867.4 x₁ + 117.953 x₂ - 165437 (R = 0.9158).