• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 하계학술대회 논문집
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• pp.274-277
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• 2000

SHS is recognized as an attractive process for producing high-temperature, hard materials that difficult and/or expensive to produce by conventional fabrication methods. The goal of this work is to investigate new express technology of doped Fe alloys materials. The high density, homogeneity of the components, and the low processing temperatures achieved and minimum synthesis time are all of paramount importance in fabricating Fe alloys as functional materials.

• 터널과지하공간
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• 제28권1호
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• pp.1-24
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• 2018

국내외 터널공사에서 TBM(Tunnel Boring Machine)의 적용사례가 지속적으로 증가하고 있다. 이에 따라 TBM터널은 더 어렵고 복잡한 특수지반을 대상으로 시공되는 사례가 많으며, 복잡한 지질 조건에 기인한 시공상의 어려움이 꾸준히 보고되고 있는 실정이다. 국내에서는 아직까지 특수 지반의 효율적 통과에 대한 연구가 미진한 실정이다. 이 논문에서는 특수지반을 대상으로 하는 쉴드TBM 터널공사에서의 지반조사와 시공과 관련된 사항에 대하여 고찰하였다. 국내외 특수지반을 통과한 시공 사례를 분석하여 쉴드TBM 터널의 특수지반을 11개로 분류하였고, 각각의 특수지반의 개념과 일반적인 문제점들을 정리하였다. 특히 도심지 천층부에서 빈번하게 조우하는 복합지반, 호박돌층, 단층파쇄대의 분류 기법, 지반조사기법, 그리고 해당지반에서의 고려사항들을 논의하였고, 향후 연구방향에 대하여 제안하였다. 본 논문은 특수지반에서의 TBM 시공기술 발전을 위한 기초연구로써 향후 관련 연구와 특수지반에서의 TBM 시공에 도움이 될 것으로 기대된다.

• 문화기술의 융합
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• 제7권1호
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• pp.256-263
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• 2021

본 논문은 정부 부동산 정책의 문제점과 개선방안을 연구하였다. 문재인 정부는 세금 중과로 투기 세력을 잡겠다고 하며 규제 일변도로 나아가고 있다. 공급보다는 재건축 규제나 은행 대출을 강화했고 양도소득세도 인상했다. 정부가 경제보다 정치 논리를 강조하며 대책을 시행하자 시장은 불안하고 경기는 침체에 빠지고 있다. 토지는 인구증가라든지 산업화, 도시화, 부의 증대로 인하여 문제의 악순환을 증가시켜왔다. 부동산 문제는 토지정책을 잘못 수립하면 토지가격 상승뿐만 아니라 무질서한 국토이용이 가속화되고 거래 질서의 문란이 파생된다. 또한 부동산은 한번 엎지른 물은 담기 어려울 정도로 토지문제를 회복하기 어렵다. 이것을 토지의 비가역성이라고 한다. 지가가 한번 폭등하면 다시 잡기 어렵고 무분별한 개발은 생태계의 파괴로 이어지어 되돌기가 여간 쉽지 않다. 이렇게 복잡다단한 부동산 문제을 정부 정책으로 단기간에 단시일에 벌주듯 시행해서는 안 되는 이유다. 이번 논문은 부동산정책의 문제점을 고찰하고 이에 대한 개선방안을 살펴보고자 한다.

• 공학교육연구
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• 제12권3호
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• pp.31-40
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• 2009

본 연구에서는 여성정보인의 여러 인구통계학적 속성과 더불어 여성정보인이 정보화에 대한 기술적 애로사항이 무엇이며, 이에 대한 해결책으로 IT 교육에 대한 수요 및 필요로 하는 IT 교육에 대해 살펴보고, 향후 업무와 관련된 활동에 있어 여성 정보인에게 선행되어야 할 소양이 무엇인가를 설문조사를 통해 분석하였다. 특히, 데이터마이닝 기법의 연관성분석을 사용하여 여성정보인 협회에서 제공하여야 하는 교육프로그램과 기 취업자 관점에서 후배 여성정보인이 취업 시 갖추어야 할 분야에 대한 다양한 분석을 시도하였다. 자료분석은 SAS의 데이터마이닝 툴을 사용하였다.

• Current Research on Agriculture and Life Sciences
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• 제2권
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• pp.122-138
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• 1984

Degree of difficulty in policy problems depends on a gap between present situation and desiriable situation. It is a international common sense that Agricultural policy is performed on the basis of protectionism, but yet it seems to be a hot issue in Korea, and there are many difficult problems in agricultural policies. Natural of these problems is interdependent. and a more efficient approach to these is to be systematic one. Therefore, in this paper, as a basic study to make more desirable agricultural policy, a basic structure for the systemization of goals or targets of Agricultural policy is studied. Because value judgement is much difficult matter in normative approach, basic goals of agricultural policy used in this study are selected among collective preference indicators which "are being required" or "should be required" clearly in our society (Korea), and the context of recent agricultural policies history in OCED countries is referenced to gain this goals in Agricultural policies.

• 청정기술
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• 제2권2호
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• pp.30-41
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• 1996

Air pollution problems are serious and present significant challenges to the engineering research community. EPA's engineering research programs have shifted from a primary focus on $SO_2$ and NOx pollution control to more complex and more difficult problems such as indoor air quality, air toxics, and global climate change. EPA research engineers are working closely with other research organizations in both the private sector and other federal research organizations to identify, evaluate, and develop cost-effective engineering solutions. The APPCE works closely with the EPA regulatory and regional offices to ensure that the best engineering information is utilized to formulate and implement the Agency's environmental protection program.

• Journal of Computational Design and Engineering
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• 제2권2호
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• pp.105-112
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• 2015

Product Lifecycle Management (PLM) ranges from design concepts of products to disposal. In this paper, we focus on the production planning phase in PLM, which is related to process planning and production scheduling and so on. In this study, key decisions for the creation of production plans are defined as production-planning attributes. Production-planning attributes correlate complexly in production-planning problems. Traditionally, the production-planning problem splits sub-problems based on experiences, because of the complexity. In addition, the orders in which to solve each sub-problem are determined by priorities between sub-problems. However, such approaches make solution space over-restricted and make it difficult to find a better solution. We have proposed a representation of combinations of alternatives in production-planning attributes by using Zero-Suppressed Binary Decision Diagrams. The ZDD represents only feasible combinations of alternatives that satisfy constraints in the production planning. Moreover, we have developed a solution search method that solves production-planning problems with ZDDs. In this paper, we propose an approach for managing solution candidates by ZDDs' network for addressing larger production-planning problems. The network can be created by linkages of ZDDs that express constraints in individual sub-problems and between sub-problems. The benefit of this approach is that it represents solution space, satisfying whole constraints in the production planning. This case study shows that the validity of the proposed approach.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.386-392
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• 1991

If we rely only on the conventional technology, It may be difficult to meet the recent requirments to electric power system such as further improvement of the quality of electric power supply, technology problems environmental compatibility and so on. Nowadays, power engineers much interest in applying new technology to power system industry. It is confirmed the technology of superconductivity applied components plays an important role in solving the problems of power system, because superconductors, used in suitable applications, can make electric power equipment smaller, lighter, more efficient and perhaps with better dynamic response. Two specific applications are considered here : electric machinery (Generators, Superconducting Magnetic Energy Storage, Transformer, Current limitter) and transmission line. The paper addresses the limitation of conventional technology, the technology impact & problems of superconductivity applied components to future power system from qualitative and some quantitative viewponts. The paper close with questions posed to simulate thinking on how superonductivity might be applied to power systems on a holistic basis.

• 디지털산업정보학회논문지
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• 제12권3호
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• pp.55-64
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• 2016

Recently, unmanned aerial vehicle, also known as drone is being used in variety of areas. Previously drones are used as military purposes. After unmanned technology went abroad to civil, drones are used as multipurpose such as hobby, business and other more. Even though drones are very useful in many areas, problems such as safety and personal privacy infringement raised new social issues. In this thesis it will analyze and suggest solutions to the social problems of personal privacy infringement which occurred by drone filming. This thesis will also suggest that new law of drone safety must legislate quickly. Drone is exploration of new filed. Varies of new technology help to grow drone industries. Drone is able to complete tasks which are impossible or very difficult to do. To constantly grow drone industries, people must have solutions for problems of drone. If people can figure out solutions problem of drone which introduced by this thesis, value of drone will grow even more.

• International Journal of Control, Automation, and Systems
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• 제2권3호
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• pp.263-278
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• 2004

This paper reviews dynamic programming (DP), surveys approximate solution methods for it, and considers their applicability to process control problems. Reinforcement Learning (RL) and Neuro-Dynamic Programming (NDP), which can be viewed as approximate DP techniques, are already established techniques for solving difficult multi-stage decision problems in the fields of operations research, computer science, and robotics. Owing to the significant disparity of problem formulations and objective, however, the algorithms and techniques available from these fields are not directly applicable to process control problems, and reformulations based on accurate understanding of these techniques are needed. We categorize the currently available approximate solution techniques fur dynamic programming and identify those most suitable for process control problems. Several open issues are also identified and discussed.