• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2023.11a
• /
• pp.115-116
• /
• 2023

In this study, it was confirmed whether kaolin can play a role as a bed materials and a role in reducing clinkers by using kaolin with a bed materials for the purpose of removing clinkers such as slagging and fouling generated in circulating fluidized bed combustion furnaces using solid fuel.

• 주류산업
• /
• v.24 no.1
• /
• pp.1-8
• /
• 2004

각종 통계 지표로 볼 때 한국경제는 지난해 3분기중 바닥을 치고 회복궤도에 접어든 것으로 판단된다. 우선 경기사이클을 나타내는 대표적 지표인 동행지수 순환변동치가 작년 7월에 바닥을 치고 다시 상승국면으로 진입한 점이다. 동행지수는 산업생산, 제조업가동률, 도소매판매, 수출액, 수입액, 비농가취업자수, 건설기성액 등 7개 지표를 하나로 묶어 실물경기 흐름을 파악하기 위해 작성하는 지표다. (중략)

• The Optical Journal
• /
• s.136
• /
• pp.42-44
• /
• 2011

부품소재산업의 발전은 산업 간 연관관계를 강화함으로써 수출과 내수 간 선순환 구조를 정착시키고, 중소기업의 발전을 통해 대기업-중소기업 간 동반성장과 일자리 창출, 내수기반의 확대에도 기여할 수 있다. 개방경제에서 일국의 국제분업 위상과 이득은 국가 간 상대적인 관계속에서 형성된다는 점에서, 개방 경제의 시각에서 본 정부의 역할은 폐쇄경제의 시각에서보다 더 크고 중요하다. 또한 경기침체기에는 부품소재에 대한 민간의 R&D투자 역량이 약화되는 경향이 있으므로 R&D투자를 위한 정부의 역할이 더욱 중요하다. 이 모두가 '부품소재특별조치법'이 연장돼야 할 이유다.

• The Journal of the Korea Contents Association
• /
• v.14 no.8
• /
• pp.431-441
• /
• 2014

In order to maximize customer's satisfaction, high-value service needs to be created by reducing service delivery errors and miscommunications. Employee's job rotation experience will help them to reduce errors and develop their career. The purpose of this study is to examine the effect of job rotation on employability and subjective career satisfaction. The results clarifies the hotel's job rotation system and examine the relationship among job rotation, employability and subjective career satisfaction. Taking samples from full-time workers in hotel, total 370 participants were used in the analysis. The SEM approach was used to analysis the data with AMOS 20.0. The results show that job rotation has a positive influence on employability and subjective career satisfaction. Moreover, employability has a partial mediation effect between job rotation and subjective career satisfaction. Therefore, the study contributes to generate theoretical and practical implications in hospitality industry.

• Journal of the Korea Concrete Institute
• /
• v.28 no.3
• /
• pp.357-363
• /
• 2016

To solve the exhaustion problem of natural aggregate which were create the high value in construction and environmental industry, recycled aggregates have considerable benefits than other materials. However, even though many researches have been conducted with recycled aggregates, building structures with recycled aggregated are rarely constructed because it has lower quality than natural aggregates have. In this study, mechanical and strain properties of recycled aggregates concrete containing steel fibers have been reviewed in order to complement performance of recycled aggregates concrete. As results, recycled aggregates concrete showed lower compressive strength and elastic modulus than plain concrete. But, recycled aggregates concrete containing steel fibers showed equivalent performance with plain concrete. In review of drying shrinkage and creep coefficient, recycled aggregates concrete containing steel fibers showed similar behavior with plain concrete in the range of 0.5 Vol.% fiber content rate by internal restraint effect, moisture transport restraint effect and strength enhancement effect of steel fiber. Therefore, it is considered that mixing steel fibers with concrete is the effective method as a active application plan for recycled aggregates.

• Journal of Korea Society of Waste Management
• /
• v.35 no.8
• /
• pp.721-730
• /
• 2018

We investigated the effects of heavy metals in cement in the last 3 years and the amount of waste in the cement manufacturing process. The result shows that the average $Cr^{6+}$ content in cement products is controlled at 10 mg/kg. Cu and Pb have lower detection tendency in white cement than in ordinary portland cement. In addition, heavy metals such as Cd show a certain level of detection regardless of the input wastes. Copper slag and phosphate gypsum are the main influencing factors on the heavy metals in cement products. In auxiliary fuels, plastics waste and wood waste are considered to affect heavy metals in cement products. Alternative raw materials are considered to be affected by the alternative raw materials managed as byproducts. In the case of supplementary fuels, auxiliary fuels managed as waste instead of auxiliary fuels managed as byproducts affect the heavy metals in cement. This study examined the input amount without considering the heavy metals in each waste. Therefore, the result may vary in different situations, and further research must be conducted to supplement the findings. However, if the heavy-metal contents in the waste are constant, it can be used as a reference material for the control of heavy metals in cement products.

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.9 no.1
• /
• pp.85-91
• /
• 2021

Aggregate waste separator with rotating separating net was designed for applying classification process of construction waste. In order to evaluate the performance of the aggregate waste separator, according to the type of waste, standardized waste samples are prepared using acrylic. The appropriate operating point was evaluated by the classification efficiency and misclassification rate of recycled aggregate according to the control frequency of the blower operating and inlet position of the separating net. The classification efficiency at the operating point of the aggregate waste separator was evaluated through flow analysis assuming recycled aggregate and waste sample as particles. As a result of the performance test, when the distance. between the conveyor belt and the inlet was 0.2m, the classification efficiency was 95%, but the misclassification rate of recycled aggregate was 2% or more, which satisfies the classification efficiency and the misclassification rate of less than 2%. The operating point was shown at a control frequency of 58Hz at a suction distance of 0.254m. As a resu lt of flow analysis, there was no misclassification of recycled aggregate. In order to redu ce constru ction waste in the existing recycled aggregate production process, adsorption system using a rotating separating net that can be operated as an installation type was built.

• Journal of the Korea Computer Industry Society
• /
• v.2 no.10
• /
• pp.1301-1308
• /
• 2001

In this paper, some interesting aspects of Grzegorczyk classes $\xi\sum{n}$, n$\geq$0 & $\sum$= { 1, 2 } of word-theoretic primitive recursive functions are observed including the classes of its corresponding predicates ($\xi\sum{n}$)* In particular, the small classes $\xi\sum{n}$($n\leq2$) are very incomparable to the corresponding small classes $\xi\sum{n}$ where $\xi\sum{n}$ is the number-theoretic Grzegorczyk classes. As one of some interesting aspects of the small classes, we show that the equivalence problem in $\xi\sum{0}$is undecidable.

• Journal of Industrial Technology
• /
• v.29 no.B
• /
• pp.89-94
• /
• 2009

The dyeing sludge is the major waste generated in Banwol & Sihwa Industrial Complex. The Purpose of this study is to develop BAT (Best available technique) for the treatment and recycling of dyeing sludge. The dyeing sludge was carbonized and the product was tested physical properties and chemical chracterizations and also analyzed chemical compositions. From the test results we expect that the products can be used as adsorbent for the removal of order in the poultry farm and cattle shed. The feasibility of other methods such as manufature of RDF and cement etc. were also studied.

• Proceedings of the Korean Nuclear Society Conference
• /
• 1995.05b
• /
• pp.1067-1074
• /
• 1995

현재 상용규모 이상의 재처리시설을 보유하고 있거나 건설중인 국가는 5개국이며, 이들의 재처리 용량은 약 5,000톤/y에 이른다. 또한 프랑스 등 5개국이 현재 총 440톤/y의 혼합핵연료 가공시설을 보유하고 있으며, 영국, 일본 등이 대규모 시설을 추가로 건설중에 있다. 재순환 산업이 성숙되어 감에 따라 2005년 경에는 전 세계적으로 누증되어 가고 있는 플루토늄 재고상황도 안정될 것이다. 앞으로 경수로가 혼합핵연료 이용의 중심 역할을 하는 가운데 고속증식로 및 신형전환로 등에의 이용도 확대될 것으로 보인다. 이제까지 총 32기의 경수로가 혼합핵연료를 사용한 실적이 있는데, 플루토늄의 수급 상황을 감안 할 때 2005년경에 가면 68기 정도의 경수로에 혼합 핵연료의 사용이 요구된다. 플루토늄 자체가 유용한 에너지원일 뿐 아니라, 이의 소진 문제도 전 세계적으로 큰 부담이 되고 있는 만큼 사용 후 핵연료사용 확대는 당연한 요구이다. 이를 위해서는 재 순환 하부구조의 확충과 함께 이에 대한 대중의 거부감을 불식시키는 한편, 각국 정부는 안정적 인허가 환경을 조성함으로써 대규모 투자를 보장할 수 있는 여건을 마련해야 할 것이다.