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KURT 부지 환경에 위치한 가상의 처분 시설에서 누출되는 방사성 핵종의 이동을 Time Domain에서 해석하는 방법에 관한 연구
황영택,고낙열,최종원,조성석,Hwang, Youngtaek,Ko, Nak-Youl,Choi, Jong Won,Jo, Seong-Seock 한국방사성폐기물학회 2012 방사성폐기물학회지 Vol.10 No.4
한국원자력연구원의 지하처분연구시설인 KURT 주변의 지하수 유동 환경과 관련하여 수집 및 분석된 자료를 바탕으로, 가상의 처분장에서 누출된 방사성 핵종의 이동 현상을 시간 영역(time domain)에서 계산하였다. KURT에서 실시된 현장 시험에서 밝혀진 수리지질학적 특성을 바탕으로 지하수 유동 모의를 실시하였고, 그 결과를 통해 파악된 지하수 유동 경로를 따라 방사성 핵종이 이동하는데 걸리는 시간은 시간 영역에서 용질 이동 모의를 하는 TDRW(Time Domain Random Walk) 방식을 통해 평가하였다. 이류(advection)와 분산(dispersion) 현상 외에 방사성 핵종의 붕괴(decay), 평형 흡착(equilibrium sorption), 암반 기질로의 확산(matrix diffusion) 현상이 용질의 이동 시간에 영향을 주는 것으로 설정되었다. 모의 결과를 통해 방사성 핵종과 지하 매질의 특성에 의한 흡착 현상, 기질 확산 현상이 핵종 이동에 미치는 영향이 분석되었으며, 방사성 핵종의 연쇄 KURT 부지 환경에 위치한 가상의 처분 시설에서 누출되는 방사성 핵종의 이동을 Time Domain에서 해석하는 방법에 관한 연구 반응에 의한 영향도 평가하였다. KURT 부지 환경에서 지표로 유출될 수 있다고 계산된 방사성 핵종의 유출량은 처분장에서 누출될 수 있는 양의 $10^{-3}$배 미만이었고, 암반 기질로의 확산 및 흡착이 고려되면 그 비율이 더욱 낮아졌다. 본 연구에서 사용된 핵종 이동 모의 방법은 방사성붕괴나 흡착, 확산 등 이동 지연 현상을 고려하면서 핵종의 이동 시간을 계산할 수 있어 안전성 평가에서 요구되는 심부 지하에서의 방사성 핵종 이동 관련 자료를 작성하는데 활용될 수 있을 것이다. Based on the data observed and analyzed on a groundwater flow system in the KURT (KAERI Underground Research Tunnel) site, the transport of radionuclides, which were assumed to be released at the supposed position, was calculated on the time-domain. A groundwater pathway from the release position to the surface was identified by simulating the groundwater flow model with the hydrogeological characteristics measured from the field tests in the KURT site. The elapsed time when the radionuclides moved through the pathway is evaluated using TDRW (Time Domain Random Walk) method for simulating the transport on the time-domain. Some retention mechanisms, such as radioactive decay, equilibrium sorption, and matrix diffusion, as well as the advection-dispersion were selected as the factors to influence on the elapsed time. From the simulation results, the effects of the sorption and matrix diffusion, determined by the properties of the radionuclides and underground media, on the transport of the radionuclides were analyzed and a decay chain of the radionuclides was also examined. The radionuclide ratio of the mass discharge into the surface environment to the mass released from the supposed repository did not exceed $10^{-3}$, and it decreased when the matrix diffusion were considered. The method used in this study could be used in preparing the data on radionuclide transport for a safety assessment of a geological disposal facility because the method could evaluate the travel time of the radionuclides considering the transport retention mechanism.
황영택,오승규,한준영,장철섭,윤송남,이원,김환태,Hwang, Yeong-Taik,Oh, Seung-Kyu,Han, Jun-Young,Jang, Chul-Sup,Yun, Song-Nam,Yi, Won,Kim, Hwan-Tae 대한용접접합학회 2004 대한용접·접합학회지 Vol.22 No.2
Ultrasonic signals transmitted through adhesively bonded plates were used to evaluate parameters related to attenuation and frequency in the adhesively bonded joint. The kinds of bonding materials with a different bonding thickness of constant pressure were used. And ultrasonic diagnosis was evaluated by p-wave sensor of 10MHz. FFT has been performed to determine bond-layer parameters such as effective thickness and frequency for adhesively bonded joint of A16061 plates in comparison with measured to theoretical ratios. When variable thickness exists, the ultrasonic spectrum was changed the frequency wave. The more materials thickness and the higher the frequency, the larger shift was observed. Measured ratios for cases of bond thickness and variety bonding materials are then used to determine bond parameters. The results show that the technique can be applied to the characterization of adhesively bonded joint.
오승규(Oh Seung Kyu),황영택(Hwang Yeong Taik),장철섭(Jang chul Sub),이원(Yi Won) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This article discusses the use of pulse-echo ultrasonic testing for the inspection of adhesive bonds between Thin sheet metal bonded joints. The method is based on the ultrasonic wave analysis at the metal/adhesive interface. The physical aspects of the phenomenon, an index is defined to detect stress zone of the joint, the influence of the experimental variables(variable stress...) on the measurement is discussed. By means of a control experiment it is shown that frequency wave energy in adhesive joints was confirmed the transition by stress variation.
공학교육 인증을 위한 메카트로닉스 전공 교육과정의 개발
이정우,정연두,심병민,채경덕,한세범,황영택,Lee Jeong-Woo,Jeong Yeon-Doo,Sim Byoung-Min,Chae Kyung-Duck,Han Seh-Beom,Hwang Yeong-Taik 한국공학교육학회 2005 공학교육연구 Vol.8 No.2
이 논문은 한국공학교육인증원의 공학교육인증 요구조건을 만족시키기 위한 삼척대학교 메카트로닉스 공학전공 교육과정의 연구에 관하여 기술하였다. 국내대학과 외국대학의 메카트로닉스 공학전공의 교육과정을 수집하고 분석하였다. 이 분석결과를 이용하고, 기계공학, 전기공학, 제어공학 그리고 컴퓨터공학의 유기적인 결합을 고려한 교육과정을 제시하였다. 더불어 삼척대학교의 지정학적인 조건과 한국공학교육인증원의 인증요구조건을 반영하였다. 그 결과 학생들에게 분석적인 능력과 실무적인 자질을 개발할 수 있도록 하는 다학제간 교육과정을 개발하였다. This paper describes the development of curriculum for the division of Mechatronics in Samcheok University to meet the requirement of Accreditation Board for Engineering Education of Korea(ABEEK). The curriculum of the department of mechatronics in South Korea and overseas university is analysed and then the curriculum is developed considering the synergistic combination of mechanical engineering, electronic engineering, control engineering and computer engineering. And then the geopolitical condition of university is reflected in the curriculum. ABEEK requirements for major of engineering are also reflected. As a result, interdisciplinary curriculum that provides analytic capability and pragmatic qualification to students is developed.
오승규(SeoungKyu Oh),김종현(JongHyun Kim),장철섭(ChulSup Jang),황영택(YeongTaik Hwang),이원(Won Yi) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Application of bonding by adhesives can be found in many industries, particularly in advanced technological domains such as aeronautical and space, automobile and electronics industries. Periodic inspection with conventional ultrasonic NDE techniques is capable of indicating the presence and possible location of crack. Continuous ultrasonic attenuation monitoring has potential to supply information. This article discusses the use of pulse-echo ultrasonic testing for the inspection of adhesive bonds between metal sheets. The method is based on the measurement of the reflection coefficient at the metal/adhesive interface. By means of a control experiment it is shown that Quantitative Nondestructive Evaluation in Adhesive Joints are evaluated together with Ultrasonic Testing and Fracture Testing.
장철섭(C. S. Jang),오승규(S. K. Oh),김종현(J. H. Kim),황영택(Y. T. Hwang),이원(W. Yi) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
This article discusses the use of pulse-echo ultrasonic testing for the stress analysis of adhesive bonds between metal sheets. The method is based on the measurement of the reflection wave at the metal/adhesive interface. After describing briefly the physical aspects of the phenomenon, an index is defined to detect defective zone of the joint(both for the lack of adhesive and for insufficient adhesion); the influence of the experimental variables(variable stress...) on the measurement is discussed. By means of a control experiment it is shown that Stress Variation in Adhesive Joints are separate to be distinguished. In this paper, Quantitative Nondestructive Evaluation in Adhesive Joints are evaluated together with Ultrasonic Testing and Finite Element Method.
오승규(Oh Seung Kyu),윤송남(Yun Song Nam),황영택(Hwang Yeong Taik),장철섭(Jang Chul Sub),이원(Yi Won) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This article discusses the use of pulse-echo ultrasonic testing for the inspection of adhesive bonds between Thin sheet metal bonded joints. The method is based on the ultrasonic wave analysis at the metal/adhesive interface. The physical aspects of the phenomenon, an index is defined to detect stress zone of the joint, the influence of the experimental variables(variable stress...) on the measurement is discussed. By means of a control experiment it is shown that frequency wave energy in adhesive joints was confirmed the transition by stress variation.
김종현(JongHyoun Kim),윤송남(SongNam Yun),오승규(SeungKyu Oh),황영택(YeongTaik Hwang),정의섭(EuiSeob Jeong),이원(Won Yi) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The ultrasonic signals transmitted through adhesive bonded joint plates is used to evaluate parameters related to attenuation and frequency in the adhesive bonded joint. When variable thickness exists, the even frequencies in the ultrasonic spectrum are changed the frequency variation. The more materials thickness and the higher the frequency, the larger shift is observed. An FFT is developed to determine bond-layer parameters such as effective thickness and frequency for adhesive bonded joint AI 6061 plates in comparison with measured and theoretical ratios. Measured ratios for cases of bond thickness and variety bonding materials are then used to determine bond parameters. The results show that the technique can be applied to the characterization of adhesive bonded joint for light vehicle body.<br/>