• Corrosion Science and Technology
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• 제5권2호
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• pp.69-76
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• 2006

Premature cracking of the epoxy coatings applied on ship's ballast tanks(BT) can lead to damage of ship's hulls. To avoid this, it's important to have clear understanding of the underlying mechanism and primary factors of the coating crack. In this study, the efforts were made to clarify the integrated effects of main factors, i.e., initial coating shrinkage, thermally induced strain, steel-structural strain and the intrinsic coating flexibility at the initial and after aging, to the early cracking phenomena of epoxy coating in the ship's ballast tank. The coating crack is caused by combination of thermal stress, structural stress, and internal stresses which is closely related to chemical structures of the coatings. On the other hand, thermal stresses and dimensional stabilities would rarely play a major role in coating crack for ballast tank coatings with rather large flexibility. Crack resistance of the coatings at early stages can be estimated roughly by measuring internal stress, FT-IR and $T_g$ value of the coatings. A new screening test method was also proposed in this study, which can be possibly related to the long-term resistance of epoxy-based paints to cracking.

• 한국기계가공학회지
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• 제11권1호
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• pp.62-67
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• 2012

Recently UV laser is widely used to process micro parts using various materials such as polymers, metals and ceramics because it has a very high intensity at the focused spot area. It is generally known that there are still some difficulties for alumina($Al_2O_3$) ceramics to directly make micro patterns like holes and lines on the surface of working material using 355nm UV laser because the alumina has a very low absorption coefficient at that wavelength. But nowadays new alumna with nano-porous holes is developed and applied to advanced micro functional parts of IT, BT and BT industries. In this paper, we are going to show the mechanism of photo-thermal ablation for nano-porous ceramics. Inside hole there is a lot of multiple reflections along the depth of hole. Experimentally we can find the micro hole drilling and micro grooving on the surface of nano-porous alumina.

• 한국생산제조학회지
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• 제19권3호
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• pp.346-352
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• 2010

Recently, the high-tech industries, such as the aerospace industry, the auto industry, and the electronics industry, are growing up considerably. Because of that, high machining accuracy and productivity of precision parts have been required. The tooling system is important part in the machining center. HSK tooling system is more suitable than BT tooling system for that of high speed machining center. It is because static stiffness and machining accuracy of HSK tooling system are higher than those of BT tooling system. In this paper, static and dynamic behavior of the HSK tooling System is analyzed according to bearing characteristics and lightweight parts. In order that, three different models of the HSK tooling system are modelled by using a 3D modeling/design program. More stable one in the models of HSK tooling system can be selected by using the FEA(Finite Element Analysis).

• 한국생산제조학회지
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• 제19권6호
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• pp.852-858
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• 2010

Recently, the high-tech industries, such as aerospace industry, auto industry, and electronics industry, are growing up considerably. Because of that, high machining accuracy and productivity of precision parts have been required. The tooling system is important part in the machining center. HSK tooling system is more suitable than BT tooling system for that of high speed machining center. It is because static stiffness and machining accuracy of HSK tooling system are higher than those of BT tooling system. In this paper, stress distribution characteristics of the HSK tooling System is analyzed according to the spindle speed. In order that, the mechanism and the force amplification principle of HSK tooling system are analyzed. The HSK tooling system is modelled by using a 3D modeling/design program. Then stress distribution characteristics of HSK tooling system are analyzed according to spindle speed by using the finite element analysis.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.46-51
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• 2002

A grinding technology is very essential to finish the surface of IT and BT industrial application parts such as wafer, optical connection part and lenses etc. However the finding machine has bead depended on imports. Especially, it is completely imported for machining high precision part relevant to domestic electric and communicational industries. The amount to import grinding machine is about $110milions. It takes about 35% of total import amount of all the machine tools. A domestic finder manufacturer is a very small-scaled bussinessman and research facilities is poor. Recently, it is increasing to demand high speed and precision grinding technology because it brings cost down and value added up. Its further study will be something related to inteligent grinding system fur value added and high precision part. It will make domestic grinding technology to its advanced country level.

• 융합보안논문지
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• 제17권2호
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• pp.153-158
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• 2017

로봇은 인간을 모방하여 외부환경을 인식하고 상황을 판단하며 자율적으로 동작하는 기계를 의미한다. 로봇은 제조용 로봇과 서비스용 로봇으로 구분하고 서비스용 로봇은 전문서비스용 로봇과 개인서비스용 로봇으로 분류된다. 최근 제조업의 생산성 경쟁 심화, 안전 이슈 부상, 저출산과 고령화 심화로 인해 로봇산업이 부상하고 있다. 최근 로봇산업은 첨단기술 분야의 복합체로 기술혁신성과 성장잠재력을 가지고 있기 때문에 각광받고 있는 산업분야이다. IT, BT 및 NT 관련 요소들이 융합되어 구현되는 기술로서 그 파급효과는 매우 커지고 있다. 사회구조와 생활패턴의 변화로 인해 생명 연장과 건강에 대한 사회적인 관심이 높아지고 있으며 의료관련 분야에 많은 관심이 모아지고 있다. 이제는 인공지능(AI) 산업이 급성장하고 있기 때문에 대 중소기업 협력 강화를 통한 글로벌 경쟁력을 확보하는 것이 우선 과제이다. 대기업의 장점인 R&D 투자능력과 마케팅 능력과 중소기업의 장점인 로봇 기술을 결합해야 하며 협력 모델 구축 및 M&A를 통해 글로벌 대기업과 경쟁력을 확보해야 한다.

• 농촌계획
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• 제12권3호
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• pp.67-80
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• 2006

The concept of RIS(Regional Innovation System) has widely been used in discourse and policy issues in Korea. But most studies of RIS concern on BT or IT industries combining with diverse regional agencies in urban areas. Some other studies were concentrated on general ideas or concept of the RIS. The purposes of this study are (1) to suggest a analytical method to select specialized industry in local autonomy, (2) to analyze the relationship between specialized industry and gross sales of agricultural products and stock farm products, (3) to analyze the relationship between gross sales of agricultural products and stock farm products and GRDP, and (4) to construct a model of RIS that fits particularly for rural areas. This study particularly accentuates that a specialized industry is more meaningful when it can raise GRDP, which eventually can give positive effect of RIS on regions.

• 기술혁신학회지
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• 제4권1호
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• pp.64-78
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• 2001

The 21st century is characterized by knowledge-based economy or society. The most important features of this knowledge society are the close relationship between science and technology, and the birth of science-based technologies or industries. Bioindustry which is the core area in this era is a representative science-based industry(SBI). In SBIs including BT(biotechnology) and ICT(information and communication technology), the creation of scientific knowledge and the ability to capitalize on that are very important. The United States leadership in research across the spectrum of science and technology is the result of the success in both achieving high level of research and capitalizing on that enabled them to grow. Capitalization is the process that transforms the results of research into practical concrete national benefits. It is such a dynamic process that cant be clearly modeled. In this study, we propose the dynamic capitalization process for innovation of SBIs in terms of the fuel and engine and analyse our potential.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2001년도 추계 학술대회논문집
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• pp.164-173
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• 2001

Advanced countries centered by National Supercomputing Center are inclined to construct Grid Infra and develop key applications in high performance computing field. They are also trying to globalize the Grid project aided by research groups in nations and continents. Computing technology and application development in Grid computing environment become indirect capital of high performance computing and information technology. Therefore, Korean government would like to participate in their Grid construction and application development actively and pursue to Grid project to develop Grid industries such as IT, BT. next five years.

• 한국산학기술학회논문지
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• 제12권5호
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• pp.2067-2077
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• 2011

최근 IT, BT, NT를 중심으로 기술간 융합이 가속화 되고, 다양한 기술이 복합적으로 활용되는 산업분야가 증가하면서 기술간 경쟁관계 분석에 대한 전략적, 정책적 필요성이 커지고 있으나 기술간 동태적 관계를 분석한 연구는 그리 많지 않다. 본 연구는 기술경쟁 관점에서 기술혁신 과정을 다룬다. 특히, 최근 정부가 우리 경제의 새로운 성장 비전으로 발표한 3대 분야 17개 신성장 동력 기술을 대상으로 하여 이들 기술들의 공진화 과정을 분석 한다. 분석을 위해서 대표적 기술혁신 자료인 특허정보를 활용하고, 동태적 경쟁확산모형으로 폭넓게 활용되고 있는 Lotka-Volterra 모형을 적용한다. 연구결과는 기술혁신 과정에 있어 3대 분야 간, 17개 신성장 동력 기술 간, 신성장 기술 내 세부기술 간 동태적 관계를 분석함으로써, 효과적인 국내 기술정책 수립과 연구개발 우선순위 선정 등의 전략적 의사결정에 활용할 수 있을 것으로 기대된다.