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일반산업분야에 있어서의 초음파검사 기술 개발에 관한 연구
황영택 三陟大學校 2000 論文集 Vol.33 No.1
In recent years, ultrasonic technics has been widely applied in inductrial fields and its application range has been expanded as a result of continuous research and development. This paper is concerned with development of ultrasonic test post-processor program and two axis automatic ultrasonic system for application of industrial fields. Test results of ultrasoic test post-processor program and two axis automatic ultrasonic system has a good agreement with results of evaluation for defect detection in industrial fields. Thus the developed ultrasonic test post-processor and two axis automatic ultrasonic system in this work is very useful for application of industrial fields.
황영택 三陟大學校 2001 論文集 Vol.34 No.1
The paper is concerned with the ultrasonic characteristics in weld zone of STS304 steel and the classifiability of weld defects in weld zone by using neural network. The classification of the artificial defects in weld zone is performed using the characteristics of echodynamic pattern in ultrasonic signal. Neural network and ultrasonic technique is applied to the classification and existence domain of artificial defects such as holes and notches. Results of system A,B agree fairly well with the ultrasonic results. Thus the proposed neural network is useful for the classfication and evaluation of weld defects.
황영택 三陟大學校 2004 論文集 Vol.37 No.-
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 energy density in adhesive joints was confirmed the transition by stress variation.
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.
초음파법을 이용한 STS 304 용접부의 결함 검출에 관한 연구(Ⅰ)
황영택,이정윤 三陟大學校 1998 論文集 Vol.31 No.1
In recent years, the use of austenitic stainless steel 304 has been increased in chemical plant and nuclear power plant. This paper is concerned with the detection of weld defects in heat affected zone(HAZ) by using ultrasonic method. In order to detect defects of austenitic stainless steel 304 weld zone, ITRB(Incident angle and Time axis Reference Block) and RDRB(Refraction angle and DAC Reference Block) were worked. Ultrasonic techniques is used to detect artificial defects such as holes and notches. Echoes on ultrasonic equipment CRT agree fairly well with actual measured defects. Thus the proposed ultrasonic method in this work is useful for detect defects of austenitic stainless steel 304 weld zone.