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로타 초음파 검사에서의 초음파 평가 결함크기와 실결함 크기와의 관계
성운학,김정태,박윤식 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1
In order to evaluate the reliability of rotor forgings, it is very important to know the actual size of the defects in the rotor forgings. The determination of the defect size requires the accurate non-destructivc measurement. However, there may be some differences between the reported size with the ultrasonic non-destructive testing method and the actual size of defects. These differences may be a severe cause of errors in evaluation of rotor forgings. So, the calculated size with "Master Curve" considering safety factor, which is usually larger than the reported size, has been used in evaluation of rotor forgings. The relation between EFBH (Equivalent Flat Bottom Hole) size measured by non-destructive method and the actual size by destructive method in many rotors manufactured at Doosan was investigated. In this investigation, "Master Curve" compensating the differences between UT reported size and actual size of defects in our rotor forgings was obtainable. The applicability of this "Master Curve" as a way of calculating the actual defect sizc was also investigated. For the evaluation of rotor forgings, it is experted that this "Master Curve" may be used to determine the accurate actual size of defects.
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전운성 韓國農業政策學會 1997 농업경영정책연구 Vol.24 No.2
남베트남은 메콩델타의 대곡창지대로 알려져 있으며 동시에 불란서의 직할식민지였던 코친차이나라고 불리워지고 있는 지역이다. 남베트남에서 볼 수 있는 극단적인 토지소유의 집중과 대지주제의 형성은 주로19세기 후반 이후 불란서 식민정책과 상품경제의 고도화에 의한 것이라고 볼 수 있다.
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Virtual FRF를 이용한 채터강성 해석에 관한 연구
김성운,정낙신,이강재,양민양 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
The prediction of chatter stable region is a significant requirement for the manufacturing industry. Usually, the chatter stability lobes are obtained by measuring the frequency response function(FRF) of a machining center using impulse test or exciter test. However, these tests are not only spent much time, but also performed after machining center is manufactured. This paper presents virtual FRF using by F.E.M for the prediction of chatter stable region. The proposed method enables a designer to estimate the chatter resistance of machine tools at the early stage of design.
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농산 폐기물인 Allium속 뿌리를 이용한 Ni와 Pb 이온 제거
김성조,백승화,김운성,문광현 한국식품영양학회 1998 韓國食品營養學會誌 Vol.11 No.6
농산물의 갈무리시 발생되는 건조한 마늘, 쪽파 및 대파 뿌리 분말을 흡착제로 이용하여 수용액 중 이온 상태로 존재하는 Ni과 Pb의 흡착력을 시료의 입자별, 중금속의 농도별, 용액의 온도별, pH별로 분석하였다. 중금속 이온들은 흡착제의 입자크기가 작을수록 흡착률이 높았고, 그중 마늘뿌리가 Pb에 대해 높은 흡착력을 나타냈다. 수용액중 중금속 농도가 높을수록 중금속들이 흡착되는 양이 증가하였고, 흡착률은 흡착제와 중금속의 종류에 따라 차이가 있었다. 온도의 증가는 쪽파와 대파에서 Ni과 Pb가 감소되었다. 알칼리 조건에서 비교적 흡착이 잘 되는 중금속은 Ni이며, 중성과 산성조건에서는 Pb의 흡착량이 높았다. A batch experiment was conducted to evaluate the removal capacity of welsh onion(Allium fistulosum L.), shallot(Allium ascalonicum L.), garlic(Allium sativum L.) roots as an adsorbent for Ni and Pb in aqueous solution. One gram of the dried Allium root powder was reacted in 100ml of solution containing 10㎎ of each heavy metal and effects of metal concentration, pH, temperature, and size of adsorbent on the removal efficiency were evaluated. The results were as follows : The amount of adsorption of heavy metal ions were higher with the smaller particles size of adsorbent. Garlic root was high adsorption capacity of Pb, especially. The higher concentration of heavy metal solution was, the more amount of adsorption of heavy metals was. The adsorption ratio was differed from a kind of heavy metal. As the temperature increased, the amount of adsorption of Ni and Pb by shallot and welsh onion were decreased. The amount of adsorption of Ni was high under alkali conditions but the amount of adsorption of Pb was high under neutral and acidity condition.
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성낙운,정성희 慶星大學校 1998 論文集 Vol.19 No.1
We examine the principles of memory coherence algorithms; central- server, migration, read- replication, full-replication, adaptive algorithm, for DSM(Distributed Shared Memory ) system, An adaptive algorithm has better performance than others in DSM system. In this paper , we propose a new memory coherence algorithm that adapts dynamically one of algorithms, migration algorithm, read-many algorithm and write-many algorithm, to an adaptive algorithm according to the number of copies of a page which are occurred by the adaptive by the access patterns in application. Here, without user annotations, compiler supports, an special hardwares, All are adapted.
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남성운,이기선 충남대학교 자연과학연구소 1989 忠南科學硏究誌 Vol.16 No.1
The states of carrier traps in the vacuum-deposited n-CdTe films have been investigated by measuring and analyzing the SCL current of Al/CdTe/In Schottky diode. The observed traps were the shallow electron traps, whose energy is 0.57eV, located between the conduction band and the fermi level. The trap density has been also measured to be 4×10^18 cm^-3 which is relatively high compared with the other specimens prepared by different methods. It seems to be due to the high density of imperfections in the films created when depositing the CdTe films without the substrate heating.
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초음파 자동 검사시스템의 개발과 오버레이 용접부의 결함검사
남영현,성운학 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.6
발전 및 산업설비에 사용되는 많은 압력용기는 저합금가강을 사용하여 제작되고 있다. 압력용기의 내면은 부식이 미치는 영향을 최소화하기 위하여 오스테나이트계 스테인리스강으로 덧살용접을 하고 있으나, 용접 층간의 계면에서 발생하고 있는 박리균열은 압력용기의 신뢰성에 중요한 변수가 되고 있다. 본 연구에서는 DSP를 사용하여 오버레이 용접부를 고속으로 검사할 수 있는 C-scan 시스템을 개발하였다. 본 시스템은 신호 처리부 (오실로스코프, 펄서.리시버, 디지타이저, DSP), 스케너, 프로그램 및 위치 제어부로 구성되어 있다. 개발된 시스템을 사용하여 실제 오버레이 용접부에 대한 초음파검사를 실시한 결과 고속으로 신뢰성 높은 검사결과를 얻을 수 있었다. Many pressure vessels for power and industrial plant are fabricated from low alloy carbon steels. The inner sides of pressure vessels are commonly weld-cladded with austenitic stainless steels to minimize problems of corrosive attack. Disbonding cracks are often detected at the transition region of welding interlayer, which is serious problem to reliability of pressure vessels. We have developed C-scan system to high speed inspection of overlay weld using DSP(digital signal processor). This system consists of signal processing parts (oscilloscope, pulser/receiver, digitizer, DSP), scanner, program and position controller. The developed system has been applied to a practical ultrasonic testing in overlay Weld, and demonstrated high speed with precision
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