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유재형,김정국,이한수,서인석,김은가,Yoo, Jae-Hyung,Kim, Jung-Kuk,Lee, Han-Soo,Seo, In-Seok,Kim, Eun-Ka 한국방사성폐기물학회 2011 방사성폐기물학회지 Vol.9 No.4
사용후핵연료의 파이로처리기술에 대한 국내외 특허동향을 분석하였다. 1975-2009년에 걸쳐 한국, 미국, 일본 및 유럽연합에서 출원된 특허에 대하여 출원국별, 출원인별, 연도별 및 세부기술분야별로 구분하여 그 내용을 비교함으로써 파이로처리기술 개발 현황을 분석하였다. 그리고 주요 출원인의 세부기술별 특허활동지수로부터 특정분야의 기술개발 편중도, 분석대상 특허의 피인용횟수와 패밀리수로부터 각국의 기술 경쟁력을 조사하였다. 또 장차 파이로처리기술의 실용화에 대비하여 필수 요소기술들을 도출하고 그에 대한 현기술 수준과 기술개발동향 등을 파악하였다. Analysis of foreign and domestic patents for pyroprocessing technology of spent nuclear fuels was carried out in this study. The current status of pyroprocessing technology development in such countries as Korea, USA, Japan and EU was analyzed by classifying the patents for 1975 through 2009 according to registration country, assignee, calendar year and technology area. The major assignees' activity indices were compared in order to find out whether there is any concentrated area of technical details. Technology competitiveness of the countries was also investigated from the information of patent citation number and family size. Furthermore, some essential unit technologies required for the commercialization of pyroprocessing were derived and examined in the aspect of the state of art as well as the trend of technology development.
방사성폐기물의 화학처리공정에 사용되는 유동관식 장치의 해석 : 물질전달 수율에 미치는 매개변수들의 민감도
유재형,이병직,심준보,김응호,Yoo, Jae-Hyung,Lee, Byung-Jik,Shim, Joon-Bo,Kim, Eung-Ho 한국방사성폐기물학회 2007 방사성폐기물학회지 Vol.5 No.1
It was intended in this study to investigate the effects of various parameters on the chemical reaction or mass transfer yield in a tubular-type nuclear waste treatment equipment. Since such equipments, as a tubular reactor, multistage solvent extractor, and adsorption column, accompany chemical reaction or mass transfer along the fluid-flowing direction, mathematical modeling for each equipment was carried out first. Then their behaviors of the chemical reaction or mass transfer were predicted through computer simulations. The inherent major parameters for each equipment were chosen and their sensitivities. affecting the reaction or mass transfer yield were analyzed. For the tubular reactor, the effects of axial diffusion coefficient and reaction rate constant on the reaction yield were investigated. As for the multistage solvent extractor, the backmixing of continuous phase and the distribution coefficient between fluid and solvent were considered as the major parameters affecting the extraction yield as well as concentration profiles throughout the axial direction of the extractor. For the adsorption column, the equilibrium constant between fluid and adsorbent surface, and the overall mass transfer coefficient between the two phases were taken as the major factors that affect the adsorption rate.
고온전해분리 기술의 개요 및 기존 핵연료주기 대체 기술로서의 적합성 검토
유재형,이병직,이한수,김응호,Yoo, Jae-Hyung,Lee, Byung-Jik,Lee, Han-Soo,Kim, Eung-Ho 한국방사성폐기물학회 2007 방사성폐기물학회지 Vol.5 No.4
The technical feasibility of a pyroprocessing of PWR spent fuels to recover nuclear fuel materials, uranium and transuranic elements group(TRU), was examined in this study. Also its applicability as a new fuel cycle technology in terms of non-proliferation was investigated. First, various unit processes were combined to a pyroprocess. Then the flow aspects of such materials of issue as uranium, transuraniums, rare earth, noble metals and heat generating elements were examined on the flowsheet, which was obtained by the assumptions on the basis of various experimental results in this work or separation data collected from literatures. Consequently, the calculated results of the material balance for the whole process showed that uranium and TRU could be recovered as products by 98.0 % and 97.0 %, respectively, from a PWR spent fuel while removing the other elemental groups into radioactive wastes. On the one hand, the TRU product was found to emit a considerable amount of ${\gamma}$-ray as well as neutrons favorably contributing to the strategy of proliferation resistance.
유재형(Jae-hyeong Yoo),임도형(Do-hyeong Lim),이수목(Soo-mok Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The impeller in a turbocharger is a key component and is subject to the various loads as well as centrifugal force over 10,000rpm. The high structural reliability and stability are required to the impeller which is assembled with a rotor shaft, bearings and thrust collar. In this paper, the structural assessment of the impeller which is made of the aluminium alloy was presented. In order to confirm it, structural and dynamic evaluation using FE analyses were performed. In FE analyses, centrifugal force, thermal load, working pressure and mechanical contact between neighboring components were taken into account. Structural contribution for each loading was compar ed. Additionally, the characteristics of deformation and vibration under each loadingwere also investigated.
코로나 검체 채취 로봇을 위한 Swab Module 메커니즘 설계
유재형(J. H. Yoo),김정률(J. R. Kim),정수훈(S. H. Jung),김계리(K. R. Kim) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
최근 장기화되고 있는 신종 코로나바이러스(COVID-19)의 유행은 필연적으로 선별 진료 인력의 확충을 야기시키고 있다. 하지만 진료 인력들은 큰 업무 부담과 함께 대면 진료 시의 코로나 감염 위험성에 노출되어 있기 때문에 정상적 업무 수행에 큰 어려움을 겪고 있다. 이러한 의료인력의 부족과 대면 진료의 위험성 문제를 해결하기 위해 최근 자동화된 비대면 코로나 검체채취로봇(Sampling Robot)에 대한 연구가 활발히 이루어지고 있다. 검체채취로봇 자동화를 위해서 채취가 이루어지는 제한된 부스 공간 내에 Swab 과 Universal Transport Medium (UTM) 수집을 위한 여러 가지 Module 들이 배치되어 있어야 한다. 따라서 좁은 면적에서 Swab 을 효율적으로 배치하는 것이 중요하다. 본 연구에서는 Swab Holder 의 높낮이를 변경할 수 있는 Snap Fit 구조를 적용하여 제한된 공간에서 효율적으로 Swab을 배치할 수 있는 Swab Module 을 설계하고 제작하였다. Swab Holder 는 Swab 이 Grip 된 다음 Holder 가 스프링 메커니즘에 의해 높이가 낮아져 로봇의 다음 Grip 동작에 대한 간섭을 제거하였다. 유한요소해석과 힘 측정 실험을 통해 Swab Holder 의 Snap Fit 메커니즘의 구동이 최적화된 설계 파라미터를 선정하고 시제품을 제작하였다. Swab Module 의 시제품은 로봇 Gripper 의 직경과 끝단 길이를 고려하여 40 mm 의 간격과 40 mm 높이 단차를 주어 교차형태로 Swab 을 배열하여 400 x 85 mm 면적에서 20 개의 Swab 이 배치되도록 제작되었다. 검체 채취 로봇과 함께 배치된 부스 내에서 효율적으로 Swab 을 배치하는 것을 확인하였고, 추후에는 실제 검체 채취 로봇 시스템에 적용하고 배치 효율성과 동작성을 확인하고자 한다.
유재형(Jae-hyeong Yoo),손정호(Jung-ho Son),김응남(Eung-nam Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A piston in a medium speed diesel engine is a key component and is subject to the mechanical load over 200bar and the high thermal load. Then, the high structural reliability is required to the piston in the marine diesel engine. 2-parts piston which is assembled with a forged-steel crown and a cast iron skirt is widespread. In this paper, the availability of the monoblock-type piston which was made of the nodular cast iron was investigated. In order to confirm it, FE analyses and strength evaluation were performed. In FE analyses, the mechanical contact between neighboring components such as piston pin and connecting rod was taken into account. Additionally, the effect of the inertia force and the side force on structural behavior and strength was confirmed. The characteristics of deformation under each loading were studied.