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X선 반가폭을 이용한 자동차 압연강의 피로수명평가에 관한 연구
장득열,조석수,김득진 三陟大學校 1998 論文集 Vol.31 No.1
In order to predict the fatigue life using X-ray diffraction techniques, in-plane bending fatigue test was carried out for SPCC steel. The relation between fatigue damage on the specimen surface and half-value breadth of X-ray diffraction lines was investigated in the process of cyclic loading. The change of half-value breadth B consisted of the three sequent except stress amplitude near fatigue limit. On the first stage, half-value breadth B decreased rapidly, on the second stage slightly, and on the third stage rapidly. B/B0-logNf relationship showed linear behavior except the early part of life. The slople of the seemed to take constant value regardless stress amplitude. On the other hand, Nf line was able to be expressed by a straight line on the B/B0-logNf relationship. Therefore, it was possible to prepose a method estimating the fatigue life fraction N/Nf using the gradient of B/B0-logNf relationship and the N? line.
평면굽힘하중을 받는 표면미소균열의 프랙탈 특성에 관한 연구
장득열,조석수,김득진 三陟大學校 1998 論文集 Vol.31 No.1
Irregular shapes and growth behavior of surface nicro-crack showed very complex and nonlinear properties and many investigators have performed theoretical analyses and experiments on them to characterize fatigue strength. They had difficulties in estimating fatigue life due to random distribution, growth and coalescence of surface micro-cracks. The straightness of crack growth along intergranular and transgranular was prevented from irregular microstructure and precipitates. Euclid geometry can't quantify shape of surface micro-crack but fractal geometry can. Therefore, it is suggested that average fractal dimension of surface micro-cracks is able to estimate fatigue life but fractal dimension of maximum surface micro0crack is not in Al 2.24-T3 alloy.
[논문]실시간 정밀 3차원 지형측량기법을 이용한 저수량산출시스템 개발
송석진,장용구,김상석,강인준 釜山大學校生産技術硏究所 2004 生産技術硏究所論文集 Vol.63 No.-
현재 고정밀도 저수량 측량에 사용되는 측량장비에는 수평위치결정방법으로 실시간 DGPS측량장비가 많이 활용되고 있고, 수심측량에는 디지털 음향측심기를 많이 사용하고 있다. 본 연구에서는 현재, 수심측량 결과처리 시 문제가 되고 있는 소프트웨어의 가격부담을 줄이고 수심측량과 내업처리에 의한 저수량산출을 통합처리 할 수 있는 국내 자체개발의 저가형 외 · 내업 일체형 저수량산출시스댐을 개발하였다.
장향동,백광균,구경림,옥선미,최진석,고은주,류성렬 한국공업화학회 2004 응용화학 Vol.8 No.2
Aflatoxin B₁ was known to have the strongest poisonous character among Aflatoxin compounds. To search the production of Aflatoxin B1 according to the change of temperature, relative humidity and incubation days, orange incubated with Aspergillus parasiticus KCCM 35078 was incubated at 20℃, 25℃, 30℃ at relative humidity 60%, 70%, 80% and for incubation time 3, 4, 5, 6, 7 days.. Production of Aflatoxin B₁ shows that the highest production appeared at 25℃ and its relative humidity 70%. The result that was quantitatively analyzed by using HPLC was 77.41ppm, and by using Fluoroscence detector was 87.87ppm. - Production of Aflatoxin B₁ shows that the lowest production appreared at 20℃ and its relative humidity 80%(HPLC), 60%(Fluoroscence detector). The result that was quantitatively analyzed by using HPLC was 4.47ppm, and by using Fluoroscence detector was 4.17ppm. The structure of Aflatoxin B₁ was identify with authentic sample by using instrumental analysis methods of GC/MS, ¹H-NMR, FT-IR respectively.
SS41불림재와 M.E.F.복합조직강의 X-선 잔류응력거동에 관한 연구
장득열,조석수,김득진 三陟大學校 1998 論文集 Vol.31 No.1
This study verified the relationship between fracture mechanics parameters ΔK, Kmax and X-ray residual stress σr for normalized SS41 steel with homogeneous crystal structure and M.E.F. dual phase steel(martensite encapsulated islands of ferrite). X-ray stress constant K was determined for the diffraction line of (211) plane using Cr-Kα radiation. K was -340.87 MPa/deg. The fatigue crack propagation test were carried out under stress ratios of 0.1 and 0.5 and X-ray diffraction technique according to crack length direction was applied to fatigue fractured surface Residual stress σr were independent on stress ratio (R=0.1, 0.5) by arrangement of ΔK. The equation of σr-ΔK was established by the experimental data. Therefore, fracture mechanics parameters could be estimated by the measurement of X-ray parameters.
X선 회절을 이용한 Al 2024-T3합금의 피로강도추정에 관한 연구
장득열,조석수,김득진 三陟大學校 1998 論文集 Vol.31 No.1
The fatigue process can be roughly divided into four stages ; cyclic hardening/softening, crack nucleation, crack propagation, and fracture. X-ray diffraction techniques can measure residual stress on the basis of the change of lattice plane spacings and half-value breadth corresponding to nonuiform strain in the constituent grains. The half-value breadth decreased with increase of number of cycles and stress range. The change of half-value breadth in crack nucleation is dependent on applied stress range. The relationship between propagation life ratio(N-Nc)/Nf and crack propagation half-value breadth ratio (Hw-Hwc)/Hwo shows strong linear behavior. Therefore, the remaining life of mechanical components can be predicted using half-value breadth ratio on crack nucleation and in process of crack propagation.
허진경,양환석,박승규,장근실,김종민 朝鮮大學校 統計硏究所 2007 統計硏究所論文誌 Vol.9 No.1
클라이언트로부터 전송되는 인증 데이터를 실시간으로 서버에서 분석하여 처리하는 시스템의 경우에는 입력되는 데이터의 양에 비례하여 서버의 부담은 증가하게 된다. 이때 서버에서는 데이터의 병목현상이 발생하게 되고, 이는 바로 전체적인 시스템의 성능을 저하시키는 결과를 초래하게 된다. 본 논문에서는 데이터 처리의 병목현상을 해결하여 시스템의 성능을 높일 뿐만 아니라, 인터넷상의 유휴 서버들을 활용할 수 있게 하기 위한 방안으로 분산처리 기술을 이용한 전처리 작업 시스템과 그 성능을 향상시키기 위한 분산 객체 활성화 시스템을 제안한다.