• The Korean Journal of Rheology
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• v.2 no.2
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• pp.28-34
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• 1990

최근 고분자 산업의 발달과 함께 고분자 혼합공정에 대한연구와 더불어 internal 혼 합기에 대한 관심이 고조되어 왔다. 본문에서는 효율적인 로우터 고안을 위하여 수학적 모 델을 이용하는 computer aided design을 다루었다. Computer aided design 하기 위하여 고 려된 인자는 유변학적 성질, 작업조건, 로우터의 형상이었으며 고안된 혼합기의 평가는 로우 터 날에서의 응력과 순환시간을 사용하였다.

• Monthly Duck's Village
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• s.56
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• pp.60-63
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• 2008

오늘날 인류가 누리는 문명은 자연에 대한 인류의 끊임없는 도전으로 이루어진 성과이지만 인류의 능력이 지나치게 거대화되어 자연의 평형상태를 깨뜨린 것이다. 또 산업 발달로 대량의 오염물질이 자연계에 확산됨으로써 자연계뿐아니라 인류 자신에게도 직접, 간접적인 피해를 주게 되었다. 근대화의 폐해로 생긴 다양한 환경오염과 생태파괴로 인해 위협받는 우리 삶을 반성적으로 성찰하고 지속 가능한 미래를 위해, 우리 먹을거리의 생산지이자 물질순환의 핵심고리인 농업의 피해를 개선해 나가고자 하는 것이다.

• Pallet News
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• s.68
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• pp.15-26
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• 2013

본 원고는 지난 2012년 11월 12일 기술표준원 중강당에서 열린 "2012 유닛로드시스템 컨퍼런스"의 발표원고로 명지전문대학 산업시스템경영과 교수 및 한국파렛트컨테이너기술연구소 소장을 역임하고 있는 엄재균 공학박사가 발표하였습니다.

• Journal of Distribution Research
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• v.1 no.1
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• pp.331-343
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• 1996

'96년도 국내유통산업은 커다란 지각변동의 해로 예측된다. 유통시장 전면 개방으로 할인업태를 앞세운 외국 유통업체의 진출이 본격화 되면서 유통시장의 대변혁을 예고하고 있다. 특히 정보통신 시스템의 발달로 기존의 제조, 유통, 소비의 경제 순환시스템도 대전환기를 맞고 있는 실정이다. 미국이나 일본등 경제 선진국에서 보여주는 멀티미디어 및 PC통신을 이용한 기업경영의 발전이 괄목할만하며 이에 따라 제조기업이나 유통기업들이 그 대응에 절치부심한다.(중략)

• Journal of the Korean Recycled Construction Resources Institute
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• v.3 no.1
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• pp.15-21
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• 2015

Recently, attempts of replacing some of natural aggregate with mix of low quality aggregate are carried out for stable supply of aggregate. However, low quality aggregate such as recycled aggregate produced during the disposal process of construction wastes and by-product aggregate produced by industrial activities has problem of failing to comply to KS Standards. Therefore, we have compared fundamental properties of concrete by using granite crushed aggregate, recycled aggregate, blast furnace and electric arc furnace slag aggregate for effective utilization of lacking aggregate resources. As the result, slump in case of mixed use of aggregate was increased 0~10% compared to single use. Therefore, it is judged to be economically advantageous as it can expect effects in unit quantity or reduction of SP agent. Compressive strength in case of mixed use of aggregate was increased 0~10% compared to single use as it filled internal crevice of concrete with continuous particle size distribution. Accordingly, if we utilize by satisfying standard particle scope through mix of aggregate with different cause of formation in proper ratio, it was possible to confirm utility of mixed aggregate with demonstration of effects of increases of fluidity and compressive strength of concrete.

• Journal of the Korean Recycled Construction Resources Institute
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• v.6 no.1
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• pp.1-7
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• 2018

This study examined the effect of binder-to-soil ratio(B/S) and water-to-binder ratio(W/B) on the flow and compressive strength development of soil concrete using high-volume supplementary cementitious materials. As a partial replacement of ordinary portland cement, 10% by-pass dust, 40% ground granulated blast-furnace slag, and 25% circulating fluidized bed combustion fly ash were determined in the preliminary tests. Using the low-cement binder incorporated with clay soil or sandy soil, a total of 18 soil concrete mixtures was prepared. The flow of the soil concrete tended to increase with the increase in W/B and B/S, regardless of the type of soils. The compressive strength was commonly higher in sandy soil concrete than in clay soil concrete with the same mixture condition. Considering the high-workability and compressive strength development, it could be recommended for low-cement soil concrete to be mixed under the following condition: B/S of 0.35 and W/B of 175%.

• Journal of Venture Innovation
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• v.1 no.1
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• pp.29-47
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• 2018

As the radical advances of digitalization, our daily life have been fundamentally changed. As a result, the customer journey also changed as compared with previous periods. This study analyzed customer journy of digital age. First, historical trends and issues of customer journey research were analyzed. Second, Comparative analysis of customer journey of digital and previous age were conducted. No more funnel model of customer journey which assumed hierarchical and linear paths was valid. Customer journey of digital age will be non-linear and circular paths.

• Journal of the Korea Society of Computer and Information
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• v.25 no.2
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• pp.189-195
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• 2020

In this study, the inlet duct and guide vane of the gas floating absorption tower were redesigned to improve the desulfurization efficiency so that the exhaust gas can be uniformly introduced into the absorption tower. In order to reduce the sulfur oxide pollutants among the main sources of air pollutants in industrial boilers, the existing equipment is redesigned and solved. For this purpose, change the exhaust gas, the slurry and recycling the adsorbent to improve the removal efficiency of SOx component in the exhaust gas inside the gas floating absorption tower so as to uniformly contact. And the initial design value and CFD value for the pressure loss from the boiler outlet to the gas floating absorption tower outlet are verified. Also, the velocity distribution of the exhaust gas, the concentration distribution of the recycled adsorbent, the liquid slurry behavior, and the pressure loss were compared. The results confirmed that the desulfurization efficiency was improved because the pressure loss from the boiler outlet to the absorption tower outlet was reduced and the deflection of the exhaust gas was minimized.

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.5
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• pp.965-973
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• 1992

Boilers, which are considered to be one of the basic equipment in industry, consume large potion of nation's petroleum and their demand is growing everyday. In recent, the technology improvement in production of high efficiency boilers and their effective utilization is needed for design of boiler which steam condition is the large capacity of high temperature and high pressure. It is necessary that boiler control system be studied for high efficiency, high reliability and smooth operation. The control of drum pressure and water level particularly becomes an important task for greater accuracy with the avail ability of boiler operation. To achieve this aim, dynamic analysis of a boiler is accomplished by choosing a boiler as a model. Transfer function thus obtained is made a comparison of measurement with reckoning to technical design data. The results of comparison makes it possible to verify thermodynamical analysis on the dynamic behavior of the overall system.

• Journal of the Korea Society of Computer and Information
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• v.25 no.12
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• pp.299-303
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• 2020

Currently, electric furnace oxide slag is mostly used for soil or road use due to its nature. Although electric furnace oxidation slag is an industrial byproduct, not a circulating aggregate, the shortcomings of electric furnace oxidation slag are gradually being resolved due to the development of technology, and it is said that electric furnace oxidation slag is enough to be used as aggregates in light of research and technology conditions outside of Korea. However, there are difficulties in expanding construction and application, given that the current standard for electric furnace oxid slag only defines recycling purposes and does not have specific regulations. Therefore, institutional supplementation is needed to utilize oxidation slag as electricity. In this study, the laws and system related to oxidation slag by electricity are reviewed, laws related to recycled aggregate are examined, and measures for improvement are proposed.