• 해양환경안전학회지
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• 제21권3호
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• pp.290-296
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• 2015

This paper presents a novel educational model of subjects of electric, electronic and control for marine engineer in accordance with STCW 2010 amendments. In accordance with STCW 2010, contents of such courses in marine engineering operations of undergraduate programs in maritime university should be updated correspondingly to new features. In order to propose the model, this paper analyses and reviews subjects on electric, electronic and control in STCW convention compared to STCW 1995. Also, in this paper, subjects of electric, electronic and control in marine engineering operations in Korea and other countries are analyzed and a new educational model is proposed. in theoretical perspective and practical perspective.

• Advances in concrete construction
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• 제16권2호
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• pp.79-89
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• 2023

The occurrence of unexpected horizontal offset in the instrument or target will result in accumulated horizontal deviation in segment alignment with traditional short-line match method. A geometry control method, the four-point method, is developed for precast segmental bridges to avoid the influences of unexpected horizontal offset. The concept of the four-point method is elucidated. Furthermore, the detailed instruments and instructions are introduced. Finally, the four-point method is validated through a practical engineering application. According to the survey data, after short-line match precast construction, the vertical deviations on both sides vary between -5 mm and 5 mm in almost all segments, and the horizontal deviations vary between -4 mm and 4 mm in all segments. Without on-site adjustment, the maximum vertical and horizontal closure gaps are 12.3 and 26.1 mm, respectively. The four-point method is suggested to alleviate the issues associated with relatively poor soil conditions in casting yard.

• 기술사
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• 제10권3호
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• pp.17-26
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• 1977

In order to obtain the most practical and economically efficient method for refining of kenaf fiber and the production possibility of bag dproucts by using kenaf, Various chemicals and conditions of treatment for refining of kenaf bark were examined. Refining by the retting method was found much beneficial in quality of fiber and in processing cost than the chemical mettled. Bag products by using kenaf bark has good quality , and for practical use, Even if the production cost is slightly more expensive than jute bag, it could be reduced by planned mass production.

• 해양환경안전학회지
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• 제18권6호
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• pp.557-562
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• 2012

승선실습교육은 해기사로서의 기본적인 소양과 기능을 연마하기 위하여 이론과 실무를 겸비하도록 하고 다양한 교육 및 훈련과정을 통해 위기상황 대처능력과 자립심을 향상시켜 선박이라는 특수한 작업환경에서 부여된 업무를 효과적으로 달성시키는데 있다. 따라서 본 연구에서는 전문적인 지식 및 리더십을 겸비한 유능한 해기사를 양성하고 승선실습교육의 목적을 달성하기 위하여 실습선 실습기관사 승선실습교육 향상 및 지도를 위한 몇 가지 개선 방안을 제안하고자 한다.

• 한국건축시공학회지
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• 제18권6호
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• pp.585-594
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• 2018

중국의 건설기업은 글로벌 건설시장에서 역할이 점점 커지고 있다. 중국 건설기업의 실적은 감리공정사를 포함한 중국 건설기술자의 능력과 자격제도에서부터 검토되어야 한다. 본 연구의 목적은 중국의 건축시공분야의 중요 자격제도인 감리공정사 자격제도의 특성을 분석하여 자격체계와 시험종목과 세부과목 등 전반적인 제도를 조사하여 특성을 분석하고 그 시사점을 도출하고자 한다. 중국의 감리공정사자격제도는 한국의 기술사 동등의 제도인 건조사 자격제도와 대비하여 별도의 시험종목과 세부과목의 구체성을 가지고 독립적인 국가자격제도로서 운영되고 있다. 이러한 감리사의 국가자격제도를 별도로 운영하는 장점은 체계적인 시험종목 및 과목의 운영과 국가제도의 권위에 있다고 판단된다. 이러한 중국의 감리공정사 관련 국가자격체계는 한국의 제도적인 개선을 모색할 때 다양한 시사점을 준다고 판단된다. 기술자격제도에 대한 중국과 한국의 상호적인 이해는 글로벌 시장에서 협력관계를 증진시킬 때 중요한 이슈가 될 수 있다.

• 한국실천공학교육학회논문지
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• 제3권1호
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• pp.32-39
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• 2011

본 연구에서는 설계교과과정 및 HRD교과과정의 체계 및 운영, 실험 실습의 운영의 개선방안을 제안한다. 구체적으로 "창의성 향상을 위한 교과과정 개선", "현장성 향상을 위한 교과과정 및 교육방법 개선", '실험 실습 교과과정 운영체계 개선"에 대한 방안을 제안한다. 특히, 경험학습에 기초한 설계교과과정과 HRD교과과정과의 통합적인 운영 가능성을 제안한다.

• Computers and Concrete
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• 제7권2호
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• pp.159-167
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• 2010

This paper demonstrates numerical techniques for complex large-scale modeling with microplane constitutive theories for reinforced high strength concrete, which for these applications, is defined to be around the 7000 psi (48 MPa) strength as frequently found in protective structural design. Applications involve highly impulsive loads, such as an explosive detonation or impact-penetration event. These capabilities were implemented into the authors' finite element code, ParaAble and the PRONTO 3D code from Sandia National Laboratories. All materials are explicitly modeled with eight-noded hexahedral elements. The concrete is modeled with a microplane constitutive theory, the reinforcing steel is modeled with the Johnson-Cook model, and the high explosive material is modeled with a JWL equation of state and a programmed burn model. Damage evolution, which can be used for erosion of elements and/or for post-analysis examination of damage, is extracted from the microplane predictions and computed by a modified Holmquist-Johnson-Cook approach that relates damage to levels of inelastic strain increment and pressure. Computation is performed with MPI on parallel processors. Several practical analyses demonstrate that large-scale analyses of this type can be reasonably run on large parallel computing systems.

• 산업기술연구
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• 제21권B호
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• pp.117-123
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• 2001

In a modern control field, a control engineer who has theoretical backgrounds with some practical knowledge is demanded. That is to say, an engineer who can understand and operate the various parts such as modeling, simulation, system analysis, signal processing, statistics, and hardware is required. In order to prove the theoretical backgrounds and operate various hardwares, a lot of experimental devices for students are designed in universities. Since the conventional experimental devices are manufactured abroad and the prices of the devices are too high, it is difficult to have. If a low cost experimental device can be developed, it will be very useful for a control engineering education. In Ibis paper, an experimental rig which has two control inputs and three sensor outputs to control the end point of a flexible beam is designed and manufactured. This rig can be used for a control field education.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 추계학술대회논문집
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• pp.523-528
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• 2002

Topology optimization is widely accepted as a conceptual design tool for the product design. Since the resulted layout of the topology optimization is a kind of digital images represented by the density distribution, the seamless process is required to transform digital images to the CAD model for the practical use. In this paper, the general process to construct a CAD model is developed to apply for topology images based on elements. The node density and the morphology technique is adopted to extract boundary contour of the shape and remove the noise of images through erosion and dilation operation. The proposed method automatically generates point data sets of the geometric model. The process is integrated with Pro/Engineer, so that the engineer in practice can directly handle with curves or surface form digital images.

• 대한기계학회논문집A
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• 제27권11호
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• pp.1925-1932
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• 2003

Topology optimization is widely accepted as a conceptual design tool for the product design. Since the resulted layout of the topology optimization is a kind of digital images represented by the density distribution, the seamless process is required to transform digital images to the CAD model for the practical use. In this paper, the general process to construct a CAD model is developed to apply for topology images based on elements. The node density and the morphology technique are adopted to extract boundary contour of the shape and remove the noise of images through erosion and dilation operation. The proposed method automatically generates point data sets of the geometric model. The process is integrated with Pro/Engineer, so that the engineer in practice can directly handle with curves or surfaces form digital images.