• Journal of the Korean Society of Propulsion Engineers
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• v.17 no.3
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• pp.56-66
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• 2013

Weight reduction of the VTHL / TSTO type of the reusable launch vehicles using RBCC engines are investigated. To predict weight and thrust of the vehicles, equations of motion are analyzed. Analysis results are compared with specifications of existing launch vehicles for validations. For the mission of inserting 2.5 ton payload to 200 km circular orbit, the case A, which uses the RBCC engine in the 1st stage shows smaller weight than the case B, which uses the RBCC engine in the 2nd stage. The weight of the case A shows only 25.8% of a existing rocket launch vehicle's weight.

• The monthly packaging world
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• s.197
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• pp.42-43
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• 2009

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.565-566
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• 2012

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.1117-1118
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• 2013

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.10a
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• pp.355-356
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• 2009

• Journal of the Korean Institute of Intelligent Systems
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• v.11 no.1
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• pp.65-69
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• 2001

본 논문에서는, 고 중량 측정 장치를 위한 적응 지능형 모니터링 시스템(Adaptive Intelligence Monitoring System ; AIMS)을 제안한다. 지능형 알고리즘으로 퍼지 알고리즘과 FNN을 적용하였으며 고 신뢰도를 가지는 적응 지능형 모니터링 네트웍 시스템의 효용성을 확인한다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.2
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• pp.168-175
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• 2022

With the recent development of nanotechnology, its application in the field of construction materials is continuously increasing. However, until now, studies on the bond characteristics of concrete and rebar for applying high-strength lightweight concrete with a compressive strength of 50 MPa and a unit weight of 16 kN/m³ to structural members are lacking. Therefore, in this paper, 81 specimens of high-strength lightweight concrete with a compressive strength of 50 MPa and a unit weight of about 16 kN/m³ were fabricated and a direct pull-out tests were performed. The design code for the bond strength of ACI-408R and the experimental results are shown to be relatively similar, and as a result of the CEB-FIP and modified CMR bond behavior models through statistical analysis, it is shown to describe well on average.

• Proceedings of the KIPE Conference
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• 2001.12a
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• pp.33-36
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• 2001

본 논문은 높은 추력비(전동기 추력/전동기 중량=N/ Kg)를 갖는 영구자석 여자 횡축형 선형 전동기(TFLM)를 가진기 엑츄에이터로 사용하여 부피와 체적을 줄이고 적은 중량이 요구되는 고출력 전동식 가진기 시스템을 유압식을 대체하여 구현하고 가변 변위 및 가변 속도가 가능한 제어 방법을 개발하여 적용하고자 한다.

• The monthly packaging world
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• s.197
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• pp.72-78
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• 2009

(주)산호수출포장은 수출용 목재상자, 철재상자 제조업체로 지난 20년간 축적된 노하우와 경험을 바탕으로 꾸준한 성장, 발전을 거듭해 온 수출포장 대표 기업이다. 특히 중량물 수출포장 부문은 약 300여개 이상의 거래사와 연간 약 130억원 이상의 매출을 유지하고 있으며 지속적인 품질 개선과 기술 개발로 ISO 9001/ISO 14001, 그리고 철재 제조 부문 3개의 특허와 2개의 실용 신안을 획득하여 국제 경쟁력과 기술력을 고루 갖추어 수출포장의 전문화에 앞장서고 있다. 본 고에서는 (주)산호수출포장의 수출용 BOX의 소재전환에 따른 구조 및 공정 개선 사례와 수출품 포장의 고정방법 개선 사례에 대하여 살펴봄으로써 중량물 및 수출 포장업계의 발전을 독려해 보고자 한다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.4
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• pp.345-352
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• 2017

Heavy weight concrete can be used in marine concrete structure to improve resistance against high wave energy. However, heavy weight aggregate, which is an indispensable material for heavy weight concrete, is difficult to be supplied in large quantities because its use is limited due to its high cost. In this work, the applicability of heavy weight by-products, copper and 3 month aged steelmaking slags, were evaluated as sources of heavy weight aggregate for marine concrete structures. Experimental results showed that copper slag was found to be a stable material for marine concrete structure. However, 3 month aged steelmaking slag showed significant expansion by $80^{\circ}$ water immersion test and ASTM C 1260 test. In addition, depth of chloride ion penetration in concrete was higher at which steelmaking slags were located. It was associated with porosity of steelmaking slag, and for this reason, steelmaking slag was not found to be suitable for marine concrete structure.