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In-Process합성에 의한 고기능 금속간화합물의 복합성형
한정현,박성갑,박용호,Han, Jung-Hyun,Park, Seong-Kab,Park, Yong-Ho 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.6
[ $MoSi_2$ ] alloys with Al, B or Nb were prepared by an advanced consolidation process that combined mechanical alloying with pulse discharge sintering (complex forming) to improve the mechanical properties. Their microstructure and mechanical properties were investigated. The $MoSi_2$ alloys fabricated by complex forming method showed very fine microstructure when compared with the sample sintered from commercial $MoSi_2$ powders. Alloys made from powders milled in Ar gas had fewer silica or alumina phases as compared to their counterparts sintered from powders milled in air. In densification of the sintered body, addition of B was more effective than Al or Nb. Both Victors hardness and tensile test indicated that the alloy fabricated by the complex forming method showed better properties than the sample sintered from commercial $MoSi_2$ powders. The Al added alloy sintered from the powders milled in air had the superior mechanical properties due to the suppression of $SiO_2$ and formation of fine $Al_2O_3$ particles.
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한정현 성신여자대학교 교육문제연구소 2001 교육연구 Vol.35 No.-
자본주의의 시장경제체제에 있어서 기업의 불실화의 원인이 어디에 있던 기업의 퇴출, 인수, 합병 및 합리와 조치에 있어서 제일차적 희생자는 근로자가 될 수 밖에 없다는 것이 그 동안의 경험이었다. 소위 정리해고는 기업의 구조조정이나 합리화 조치에 있어서 가장 손쉽고도 효과적인 방법이었던 것이기 때문이다. 여기서 우리는 기업의 구조조정에 있어서 정리해고라는 하는 종래의 안일한 방법보다는 한층 적극적인 고용정책이라는 새로운 길을 모색해야 할 것이다. The definition of the word, workforce reduction, means that a company cuts off or lays off the present workers in order to rearrange the personnel and to cope with economic, industrial, and technological change according to its rationalization plan. Workforce reduction is likely to be a social problem because of the mass lay-off at the same time. It is different from that of the reprimand oriented lay-off, which is very small scale and proper reason for that. Workforce reduction enforced by the company in case of its strained situation already has become one of major social problems in United States, Germany, and Japan and has been debated for a long time and already have been established legally and administratively. Recently, our country facing with the IMF crisis has witnessed that the highest records of unemployment rate in the history are renewed daily. As business environments are changed extensively, workforce reduction legislation seems to be necessary to improve the competitive power of firms. The purpose of this study is to examine the workforce reduction problem. In many industrial countries, the workforce reduction has been a frequent topic over the discussion as an important social problem and they set up a proper system for this in order to protect workers and so, it is very influential over their national economy. It is important for both the employer and the employee to interpret and apply the conditions for workforce reduction reasonably in this national economical crisis. It is natural that, three parts, the government, employer, and employee feel they are responsible for a bad effect of workforce reduction, which has to be settled by a public helping-out in many industrialized countries and this trend is common t be recognized in the world. Although the issues related to the conditions for workforce reduction are relevant to the labour law actually, the conditions for workforce reduction should be formulated conceptually with the large perspectives of employment policy, emplyment insurance, employment stabilization policy and employment training system, and should be operated under the law.
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한정현,박헌기,정문주 한국시뮬레이션학회 2001 한국시뮬레이션학회 논문지 Vol.10 No.3
Rendering of 3D terrain data in real-time is difficult because of its large scale. So, it is necessary to use level-of-detail(LOD) that uses fewer data, but makes almost similar image to the original. We present an algorithm for real-time LOD generation and rendering of 3D terrain data. The algorithm applies wavelet transform to the terrain data, and then generates quadtree based view-dependent LOD using wavelet coefficients that are the output of wavelet transform. It also uses frame-to-frame coherence and view culling for high frame rates.
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한정현 한국국어교육학회 2012 새국어교육 Vol.0 No.90
However, this meaningful performance assessment has not been fully implemented in teaching fields despite the fact that it has been adopted for over ten years. This research starts from the point of having a question about this reality. Besides the lack of institutional strategy and teachers' low acknowledgement, this question leads to another problem that the philosophical theory to support the realization of the performance assessment is ambiguous. In addition, when referring to the performance assessment in Korean education, it is not just a simple task performance, but also all the circumstances related to the assessment. Therefore, the ecological organization of performance assessment is required. The ecological strategy in Korean education emphasizes the relation between organisms and surroundings. All the factors related to the learner, "I," have an equal effect. To have the ecological organization for performance assessment, the learner should acquire practical knowledge, sustainable literacy skills, and ability to interact with circumstances. Particularly, by ecologically analyzing the classroom, which is mainly taken place for learning, and by combining with "writing" education, a specific model for ecological performance assessment will be introduced. One of the features of 2011 national curriculum is acknowledging each student's personality and level, and providing appropriate task to accomplish. The ecological performance assessment does not apply same criteria to all learners, but includes various relations with surroundings into the assessment. As a result, the ecological performance assessment could be used to provide practical help to the learners' learning process. 이 연구는 가치를 인정받은 수행평가가 7차 교육과정부터 도입된 지 십 수 년이 지난 지금도 온전하게 정착되지 못하는 이유에 대한 의구심에서 출발한다. 그리고 그것은 제도적인 지원과 교사들의 인식 부족 등 통상적인 원인 외에도 수행평가를 효과적으로 구현하기 위한 철학적 관점이 명확하지 못하다는 문제의식으로 전이되었다. 이때 국어교육의 수행평가를 바라보는 관점이라고 하는 것은 단순한 과제 수행 행위를 나타내는 것이 아니라 수행평가가 이루어지는 제반 현상 모두를 보는 안목을 말하는데, 여기에서 이른바 생태학적 구성의 필요성이 요구되는 것이다. 생태학적 국어교육은 유기체와 유기체를 둘러싼 환경과의 관계를 중요시한다. 일반적으로 교수자나 학습자가 중심이 되고 환경은 제반 요소로 작용하는 것과 달리 생태학적 측면에서 바라본다면 ‘나’를 둘러싼 모든 현상들이 대등한 위치에서 영향을 끼친다. 그런 속에서 실제적 지식, 지속가능한 문해력, 환경과의 상호교섭능력 등의 함양에 대한 가치가 발현될 수 있어야 이른바 ‘생태학적 수행평가’가 의미를 갖는다. 특히 학습자 생활의 상당 부분을 차지하고 있는 교실을 생태학적으로 분석해보고 이를 ‘쓰기’ 영역과 접목해 보는 속에서 생태학적 수행평가의 구체적인 모형을 살펴볼 수 있다. 2011 교육과정의 특징 중 하나는 학습자의 개별성과 수준을 인정하고 이에 따라 적절한 과제를 수행할 수 있도록 지도하는 것이다. 생태학적 수행평가는 모두 다 같은 기준을 적용하는 것이 아니라 환경에 따른 다양한 관계성들을 평가에 적용시킴으로써 학습자의 삶에 실질적인 도움을 주는 평가 방식으로 활용될 수 있을 것이다.
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