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분말야금 및 주조형 니켈기 초내열합금 크리프 신뢰성의 초음파 모니터링
최찬양,송진헌,오세웅,김정석,권숙인,오승탁,현창용,변재원,Choi, Chan-Yang,Song, Jin-Hun,Oh, Se-Ung,Kim, Chung-Seok,Kwun, Sook-In,Oh, Sung-Tag,Hyun, Chang-Yong,Byeon, Jai-Won 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.3
An attempt was made to evaluate creep reliability of two commercial Ni-based superalloys by using ultrasonic wave. The materials include fine-grained PM alloy fabricated by mechanical alloying and subsequent hot isostatic pressing, and IN738LC cast alloy with a grain size of a few cm. Microstructural parameters (fraction of creep cavity and size of ${\gamma}^{\prime}$ precipitates) and ultrasonic parameters (velocity, attenuation) were measured to try to find relationships between them. Ultrasonic velocity decreased with creep cavity formation in PM alloy. On the other hand, no distinct changing trend of ultrasonic velocity was observed for IN738LC alloy. Ultrasonic attenuation was found to have a linear correlation with the size of ${\gamma}^{\prime}$ precipitates and was suggested as a potential parameter for monitoring creep reliability of IN738LC alloy.
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Ball milling한 AB₂계 금속수소화물 전극의 전기화학적 특성
심종수(Jong Su Shim),오세웅(Se Ung Oh),노학(Hak Noh),최전(Jeon Choi),서찬열(Chan Yeol Seo),박충년(Choong Nyeon Park),최승준(Seung Jun Choi) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.4
The electrochemical properties of the AB₂-type (Zr-Ti-V-Ni-Cr-Co-Mn) metal hydride electrodes prepared by ball milling with AB<sub>5</sub>-type {(LM)Ni<sub>3.6</sub>Al<sub>0.4</sub>Co<sub>0.7</sub>Mn<sub>0.3</sub>}(LM : Lanthanum-rich mischmetal) alloy powder as a surface activator were investigated. By ball milling with AB<sub>5</sub> type alloy powder, the activation of AB₂ type metal hydride electrode was accelerated resulting in an increase of discharge capacity from 35% to 85% of the maximum capacity at the first cycle. As the amount of surface activator increased the activation rate increased, whereas the discharge capacity increased with 10wt% and decreased with 20wt% addition of the surface activator. When the amount of the surface activator was kept constant as 10wt%, the discharge capacity and the activation rate increased with ball milling time up to 20 hours. However beyond 20 hours of ball milling time, they decreased drastically due to the nano-crystallization or amorphorzation of the alloy powder.
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특수교육진흥법 규정의 분석과 해석 (2) : 주요 내용 및 절차 사항을 중심으로 Focusing on the Major Contents and Procedures
한현민,오세웅 국립특수교육원 2003 특수교육연구 Vol.10 No.2
본 연구는 특수교육진흥법의 규정을 체계적으로 분석·검토함으로써 그 개정의 방향을 제시하는데 목적이 있다. 본 연구에서는 1994년 특수 교육진흥법을 중심에 두고 이 법률이 특수교육에 관해 규정한 주요 내용과 절차 사항을 비판적으로 분석·검토하고, 이를 1977년 특수교육진흥법 규정과도 비교·논의하였다. 구체적으로 특수교육진흥법의 주요 규정을 특수교육의 성격과 범위(의무교육, 무상교육, 위탁교육, 공교육, 적절한 교육), 특수교육대상자의 선정과 배치(진단·평가, 심사, 선정, 배치), 특수교육대상자의 교육(개별화교육계획의 수립, 특수교육의 실시, 치료교육의 실시) 등 세 영역으로 대별하여 분석·해석한 다음, 1994년 개정 특수교육진흥법에 직·간접적인 영향을 미친 미국의 장애인교육법(IDEA: Individuals with Disabilities Education Act)과도 비교·논의하였다. 이러한 규정점토와 논의를 통해, '한국' 특수교육의 발전을 위한 법개정의 대안을 제안하였다. The present study was undertaken to systematically analyze and examine the provisions of the Special Education Promotion Law (SEPL) and ultimately to recommend the directions for the future revision of the law. The major contents and procedures regulated by the law amended in 1994 on the Korean special education were critically discussed and were compared with the law enacted in 1977. In the study, the major articles of the law were examined in terns of three important areas. First the discussion on the nature and the scope of special education included compulsory and/or free education, consigning special education to private special education institute, public education, and appropriate education. Second, the selection and placement procedures of the children with disabilities were reviewed. including diagnosis and evaluation, judgment, and selection of the children with disabilities, and their placement in the schools. Finally, the educational processes with the children with disabilities were analyzed and interpreted in the three aspects of individualized education planning, special education, and therapeutic education delivery. In addition, these contents and procedures were compared with the 1997 amendments of Individuals with Disabilities Education Act (IDEA) had directly and indirectly influenced the law revised in t994. Through these regulation examination and theoretical interpretation, the alternatives for the revision of the law were presented to further develop 'Korean' special education.
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