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A.6 : 서비스 품질 : A.6.2 ; 암검진 프로세스효율 향상과 15일 이내 미통보율 감소
김향욱 ( Hyang Ok Kim ),이난영 ( Ran Young Yi ) 한국품질경영학회 2011 한국품질경영학회 학술대회 Vol.2011 No.1
The number ofimplemented cancer screening per year of the National Cancer Screening Center was about 8,300. The cancer screening process was inefficient and a significant number of the result was notified to the customers within 15 days. In this study, the six sigma is introduced to improve there process and the problems. As a result, the monthly average cases of cancer screening are increased from 896 to 1,219. In addition, the rate of the notification within 15 days is increased from 66.1% to 98.8%. Moreover, the cancer screenings are activated through the guidelines and standardization of process of the support team. Therefore Customers` satisfaction is higher than before.
온간 ECAP 법에 의해 제조된 5083 Al 합금의 미세조직과 기계적 특성
강석봉,강효경,김향욱,Bachelard, L . 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.5
The microstructure and mechanical properties have been investigated on a commercial 5083 aluminum alloy processed by the equal-channel angular pressing (ECAP) at 473K. The microstructure of a single pass sample consisted of elongated subgrains. Increasing the number of pass led to very fine equilibrium grains having high angle grain boundaries. The 0.2% yield stress and hardness after a single pass increased greatly, and then kept constant with additional straining. On the other hand, the elongation to failure of a single pass sample decreased a little to compare with sample before ECAP, but there was no further reduction with additional straining. Recrystallization partially occurred in ECAPed 5083 aluminum alloy when annealed at 523K for 1 hr, and completely finished when annealed only at 573K for 1 hr. With increasing the number of pass, the onset temperature of recrystallization decreased and the rate of softening increased.
반복겹침 접합압연으로 제조된 A1100 알루미늄합금 판재의 기계적 특성
강석봉,진선화,김향욱 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.5
In this study, the microstructure and mechanical properties of A1100 aluminum alloy sheets manufactured by the Accumulative Roll Bonding(ARB) process were investigated. Hot rolled A1100 sheets were highly strained up to a true strain of 6.32 at room temperature by the ARB process. These sheets were recrystallized at the temperature range of 150℃ to 400℃ for 1hr. The ARB process was repeated up to 6 cycles and well bonded sheets were obtained successfully. The hardness and tensile strength of 6th ARBed specimen(true strain : 6.32) are three times higher than those of a hot rolled sheet. After recrystallization treatment at 200℃, the specimen has ultra-fine grain structures with grain size of less than 1 ㎛. In case of annealing at 300℃ for 1hr., the microstructures of the specimens consist of fully recrystallized grain structure with the grain size less than 7 ㎛.