• 한국식품과학회지
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• 제47권1호
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• pp.6-12
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• 2015

본 연구에서는 농산부산물인 배추 겉잎의 이용성을 증진시키기 위하여 배추의 불용성 식이섬유인 hemicellulose를 분획한 후 효소 처리하여 수용성 식이섬유를 함유한 가수분해물을 생산하고자 하였다. 이를 위해 다양한 pH, 온도, 기질농도 및 효소농도에서 hemicellulose 분획을 효소 처리한 후 환원당 함량을 측정한 결과, pH 5.0, $40^{\circ}C$, 효소농도 45 unit (Shearzyme plus), 21 unit Viscozyme L)의 조건으로 가수분해 했을 때 가장 높은 분해율을 나타내었다. 선정된 조건으로 72시간 가수분해하여 수율을 측정한 결과, Shearzyme plus 및 Viscozyme L 처리 시 각각 22.64%와 24.73%의 수율을 보였다. 또한 알코올 불용성 식이섬유의 겔크로마토그래피에 의한 분자량 분포를 확인한 결과, Shearzyme plus 및 Viscozyme L에 의해 생성된 식이섬유는 반응 시간이 증가함에 따라 저분자화 되는 것을 확인 할 수 있었다. 이상의 결과에서 배추 부산물 hemicellulose 분획을 효소로 가수분해함으로써 불용성 식이섬유가 저분자화 되어 수용성 식이섬유로 전환됨을 확인하였으며, 생산된 식이섬유소 함유 가수분해물은 기능성 식품 및 식품가공 분야에 다양하게 이용될 수 있을 것으로 판단된다.

• 한국융합학회논문지
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• 제8권2호
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• pp.113-120
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• 2017

본 실험에서는 전산화단층영상장비에서 패각을 이용하여 제작한 방사선 융합차폐체의 표면 방사선 감소율과 방사선 인공물 영상을 평가하고자 하였다. 방사선 융합차폐체는 실리콘, 패각, 바륨분말을 이용하여 직경 50 mm, 두께 3.5 mm의 원형 차폐체 5종 (실리콘 차폐체, 바륨 차폐체, 실리콘과 패각 혼합 차폐체, 실리콘과 바륨 혼합 차폐체, 실리콘과 패각 그리고 바륨 혼합 차폐체)을 제작하였다. 방사선발생과 획득은 4 다중채널 전산화단층영상장비를 이용하였다. 그 결과 실리콘과 패각 혼합 차폐체가 영상의 인공물 발생 없이 5.3%의 표면 방사선 감소효과가 있었다. 향후 다양한 형태를 만들 수 있는 실리콘의 장점과 패각의 재활용으로 인한 친환경적인 소재로 방사선 융합차폐체 제작에 도움을 줄 수 있으리라 기대한다.

• 공업화학
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• 제27권4호
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• pp.371-379
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• 2016

사용 후 발생되는 폐 LCD판넬용 유리의 재활용 방안을 마련하고자 별도의 전처리 없이 폐 LCD판넬을 습식분쇄함으로서 발포체 제조용 원료유리로 사용가능한 폐 붕규산유리의 회수 방법을 조사하였으며, 이렇게 회수된 폐 붕규산유리를 사용하여 발포체의 제조를 시도하였다. 입도 270 mesh 이하의 크기로 분쇄 조절된 폐 붕규산유리를 대상으로 폐 붕규산분말 100 g에 대해 발포제로서 탄소분을 0.3 중량 분율, 추가 발포조제로서 $Na_2CO_3$, $Na_2SO_4$, $CaCO_3$를 각각 1.5 중량 분율이 되도록 첨가한 원료 유리분말을 발포소성온도 $950^{\circ}C$에서 20 min간 발포를 진행함으로서 밀도가 $0.3g/cm^3$ 이하되는 발포체를 제조할 수 있었다. 또한 원료 유리에 추가적으로 $SiO_2$ 또는 $H_3BO_3$를 첨가함으로서 얻어지는 발포체에 효과적으로 개기공을 형성할 수 있었으며, 개기공의 형성은 흡음 등 새로운 기능을 가진 발포체의 제조 가능성을 보여주었다.

• 한국자원식물학회지
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• 제14권2호
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• pp.102-107
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• 2001

팽이버섯 1주기를 수확한 폐배지 톱밥을 버섯재배 용으로 재활용 할 수 있는지를 알아보고자 팽이버섯을 재배한 침엽수재 의 톱밥을 현미경적 관찰을 통해 그 분해정도와 분해양태를 파악하였다. 아울러 팽이버섯 재배에 사용된 톱밥의 수종 식별도 실시하였다. 팽이버섯 재배용으로 사용된 톱밥의 수종은 대부분 소나무속 경송류로 식별되었고 극히 일부만 미송 (Douglas-fir)톱밥이 존재하였다. 팽이버섯 1주기를 수확한 폐배지 소나무 톱밥에는 균사에 노출된 부분과 방사조직에서 균사의 밀도가 높게 나타났다. 팽이버섯균의 공격을 받은 세 포벽은 박벽화현상과 침식현상을 보였으나, 이 같은 부후양태를 보인 세포벽은 극히 일부에 지나지 않았다. 이상의 현미경 관찰결과 팽이버섯을 1주기 수확한 소나무 톱밥은 버섯재배용으로 재활용하기에 충분한 세포벽 물질을 보유하고 있는 것으로 나타났다.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 2002년도 춘계 학술발표회 논문집
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• pp.227-234
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• 2002

With the increasing environmental consideration and stricter regulations, gasification of waste is considered to be more attractive technology than conventional incineration for energy recovery as well as material recycling. The experiment for combustible waste mixed with plastic and cellulosic materials was performed in the fixed bed gasifier to investigate the gasification behavior with the operating conditions. Waste pelletized with a diameter of 2~3cm and 5cm of length was gasified at the temperature range of 1100~145$0^{\circ}C$. It was shown that the composition of H$_2$ was in the range of 30~40% and CO 15~30% depending upon oxygen/waste ratio. Casification of waste due to thermoplastic property from mixed plastic melting and thermal cracking shows a prominent difference from that of coal or coke. It was desirable to maintain the top temperature up to foot to ensure the mass transfer and uniform reaction through the packed bed. As the bed height was increased, the formation of H$_2$ and CO was increased whilst $CO_2$ decreased by the char-$CO_2$ reaction and plastic cracking. From the experimental results, the cold gas efficiency was around 61% and heating values of product gases were in the range of 2800~3200㎉/Nm3.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.479-482
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• 2008

Since late of 2000, KIER has developed a novel pyrolysis process for production of fuel oils from polymer wastes. It could have been possible due to large-scale funding of the Resource Recycling R&D Center. The target was to develop an uncatalyzed, continuous and automatic process producing oils that can be used as a fuel for small-scale industrial boilers. The process development has proceeded in three stages bench-scale unit, pilot plant and demonstration plant. As a result, the demonstration plant having capacity of 3,000 tons/year has been constructed and is currently under test operation for optimization of operation conditions. The process consisted of four parts ; feeding system, cracking reactor, refining system and others. Raw materials were pretreated via shredding and classifying to remove minerals, water, etc. There were 3 kind of products, oils(80%), gas(15%), carbonic residue(5%). The main products i.e. oils were gasoline and diesel. The calorific value of gas has been found to be about 18,000kcal/$m^3$ which is similar to petroleum gas and shows that it could be used as a process fuel. Key technologies adopted in the process are 1) Recirculation of feed for rapid melting and enhancement of fluidity for automatic control of system, 2) Tubular reactor specially-designed for heavy heat flux and prevention of coking, 3)Recirculation of heavy fraction for prevention of wax formation, and 4) continuous removal & re-reaction of sludge for high yield of main product (oil) and minimization of residue. The advantages of the process are full automation, continuous operation, no requirement of catalyst, minimization of coking and sludge problems, maximizing the product(fuel oil) yield and purity, low initial investment and operation costs and environment- friendly process. In this presentation, background of pyrolysis technology development, the details of KIER pyrolysis process flow, key technologies and the performances of the process will be discussed in detail.

• 한국토양비료학회지
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• 제47권6호
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• pp.540-546
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• 2014

Acid mine drainage sludge (AMDS) has been classified as mine waste and generally deposited in land. For this reason, studies have been conducted to examine the possibility of recycling AMDS as an amendment for heavy metal stabilization in soil. The main objective of this study was to evaluate heavy metal stabilization efficiency of AMDS comparing with the widely used lime stone. Also, optimum mixing ratio was evaluated for enhancing heavy metal stabilization. AMDS and limestone were mixed at the ratio of 0:100, 25:75, 50:50, 75:25, and 100:0 with five different heavy metal solutions ($100mg\;L^{-1}$ of $NaAsO_2$, $CdCl_2$, $CuCl_2$, $Pb(NO_3)_2$, and $ZnSO_4{\cdot}7H_2O$). The amendments were added at a rate of 3% (w/v). In order to determine the stabilization kinetics, samples were collected at different reaction time of 0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024 minutes. The heavy metal stabilization by AMDS was faster and higher than those of limestone for all examined heavy metals. While limestone showed only 20% of arsenic (As) stabilization after 1,024 minutes, 96% of As was stabilized within 1 minute by AMDS. The highest effect on the stabilization of heavy metal (loid) was observed, when the two amendments were mixed at a ratio of 1:1. These results indicated that AMDS can be effectively used for heavy metal stabilization in soil, especially for As, and the optimum mixing ratio of AMDS and lime was 1:1 at a rate of 3% (w/v).

• 한국도로학회논문집
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• 제18권4호
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• pp.29-35
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• 2016

PURPOSES : The new waste management policy of South Korea encourages the recycling of waste materials. One material being recycled currently is tire-derived fuel (TDF) ash. TDF is composed of shredded scrap tires and is used as fuel in power plants and industrials plants, resulting in TDF ash, which has a chemical composition similar to that of the fly ash produced from coal. The purpose of this study was to evaluate the properties of an asphalt concrete mix that used TDF ash as the mineral filler. METHODS : The properties of the asphalt concrete were evaluated for different mineral filler types and contents using various measurement techniques. The fundamental physical properties of the asphalt concrete specimens such as their gradation and antistripping characteristics were measured in accordance with the KS F 3501 standard. The Marshall stability test was performed to measure the maximum load that could be supported by the specimens. The wheel tracking test was used to evaluate the rutting resistance. To investigate the moisture susceptibility of the specimens, dynamic immersion and tensile strength ratio (TSR) measurements were performed. RESULTS : The test results showed that the asphalt concrete containing TDF ash satisfied all the criteria listed in the Guide for Production and Construction of Asphalt Mixtures (Ministry of Land, Infrastructure and Transport, South Korea). In addition, TDF ash exhibited better performance than that of portland cement. The Marshall stability of the asphalt concrete with TDF ash was higher than 7500 N. Further, its dynamic stability was also higher than that listed in the guide. The results of the dynamic water immersion and the TSR showed that TDF ash shows better moisture resistance than does portland cement. CONCLUSIONS : TDF ash can be effectively recycled by being used as a mineral filler in asphalt, as it exhibits desirable physical properties. The optimal TDF ash content in asphalt concrete based on this study was determined to be 5%. In future works, the research team will compare the characteristics of asphalt concrete as function of the mineral filler types.

• Composites Research
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• 제18권1호
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• pp.55-66
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• 2005

페놀 컴포지트(이하 PC라 약칭)의 실용화에 대해서, 세계에서 가장 빠르게 실용화 한 $\lceil$영국의 경우$\rfloor$에 대해서 본보고서를 포함해서 합계 7편을 보고했다. 제1$\~$2편은 런던 지하철 화재사고 대책을 중심으로 세론과 행정 측의 민첩하고 신속한 대응이 시민에게 $\lceil$검은 연기와 유독가스의 화재사고$\rfloor$를 일어나지 않도록 하는 $\lceil$안전$\rfloor$을 보장한 이야기를 2회 보고했다. 제3$\~$4편은 선박$\cdot$주정, 해상 오일리그 등 역시 $\lceil$화재가 발생하면 도피하기 어려운 장소$\rfloor$에서의 실용화 상황, 제5편은 그 응용으로써 $\lceil$건설$\rfloor$ 특히 $\lceil$건축$\rfloor$ 용도에서의 실용화에 대해서 영국사회의 노력을 서술했다. 그리고 제 6편과 본편에서는 그 실용화 과정에서, 지금까지 겪은 시행착오의 기술적인 기초 데이터의 수집과 초기 실적과정에서의 어려웠던 이야기를 서술한다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.222-222
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• 2011

Plastic product is increasing by the growth of its demand and most of refused plastics are incinerated or reclaimed. However, the refused plastic is not easily decomposed and has the environmental problem with its various toxic gas in case of incineration. Therefore, many countries such as USA, Japan, Germany and other developed industrial countries as well as Korea are interested in studying the recyclable resource of refused plastic. The macromolecular waste pyrolysis has the advantage of collecting of raw materials in high price and can at least get fuel gas or oil with high heat capacity. It also discharges low waste gas and low toxic gas including SOx, NOx and HCl heavy metals. However, pyrolyzed oil includes enough excess unsaturated hydrocarbons to form tar, which can cause the nozzle of engines to plug when pyrolyzed oil is used as fuel. Activated carbon was proven to have prominent adsorption capability among the other adsorbents that were mainly composed of carbon. This study examined the possibility of application in activated charcoal of its solid formation by analysing the feature of pyrolysis which is one of the chemical recycling methods and getting chemical analysis of the product and activated energy. Analyze the element of the oil produced by pyrolysis using GC-MS. The experiment of tar adsorption using fly-ash showed that fly-ash improved the optical intensity of pyrolyzed oil and decreased oxygen compounds in the pyrolyzed oil.