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신진명(Jin-Myeong Shin),김광렬(Kwang-Ryul Kim),박장진(Jang-Jin Park),신설우(Seol-Woo Shin) 대한환경위생공학회 2004 대한환경위생공학회지 Vol.19 No.4
This study has been investigated to analyze the thermal stability of cesium reacted with fly ash with changing mole ratio of Cs/Al in hydrogen atmosphere. When the CsNO₃ and fly ash were reacted at 1000℃ in hydrogen atmosphere, cesium nepheline(CsAlSiO₄) phase began to emerge in addition to pollucite(CsAlSi₂O_6) phase when the cesium loading quantity was greater than 0.32(g-Cs₂O/g-fly ash). Cesium nepheline(CsAlSiO₄) phase increased with increasing cesium loading quantity. When cesium trapped on a fly ash was exposed to 1200℃ in hydrogen atmosphere, no weight loss due to the volatilization was shown until the cesium loading quantity was reached at 0.32(g-Cs₂O/g-fly ash). In the case of the cesium loading quantity of 0.48~0.74(g-Cs₂O/g-fly ash) in hydrogen atmosphere, the weight loss increased with increasing the cesium loading quantity. This is considered to be due to the cesium nepheline(CsAlSiO₄) whose vapor pressure is higher than that of pollucite(CsAlSiO_6).
신진명(Jin-Myeong Shin),박장진(Jang-Jin Park),양명승(Myung-Seung Yang) 대한환경위생공학회 2004 대한환경위생공학회지 Vol.19 No.2
Dry decontamination technique is required for maintaining nuclear material handling equipment contaminated with highly radioactive material in a hot cell. In order to determine the optimum blasting conditions of dry ice pellet blasting device, the basic experiments have been conducted on the simulated test specimens of four types of metals. The removal efficiency of test piece was evaluated by the XRF analysis and the change of the surface condition before and after blasting. The removal efficiency of cesium on loose contamination was 100% under blasting pressure; 3 ㎏/㎠, blasting distance; 10 ㎝, blasting time; 10 sec. In case of fixed contamination, the removal efficiency of cesium was almost 96% under blasting pressure; 4㎏/㎠, blasting distance; 10 ㎝, blasting time; 30 sec.
비트열 스캔을 통한 고속의 Non-Adjacent Form (NAF) 변환
황두희(Doo-Hee Hwang),신진명(Jin-Myeong Shin),최윤호(Yoon-Ho Choi) Korean Institute of Information Scientists and Eng 2017 정보과학회논문지 Vol.44 No.5
As a special form of the signed-digit representation, the NAF(non-adjacent form) minimizes the hamming weight by reducing the average density of the non-zero bits from the binary representation of the positive integer k. Due to this advantage, the NAF is used in various fields; in particular, it is actively used in cryptology. The existing NAF-conversion algorithm, however, is problematic because the conversion speed decreases when the LSB(least significant bit) frequently becomes 1 during the binary positive integer conversion process. This paper suggests a method for the improvement of the NAF-conversion speed for which the problems that occur in the existing NAF-conversion process are solved. To verify the performance improvement of the algorithm, the CPU cycle for the various inputs were measured on the ATmega128, a low-performance 8-bit microprocessor. The results of this study show that, compared with the existing algorithm, the suggested algorithm not only improved the processing speed of the major patterns by 20% or more on average, but it also reduced the NAF-conversion time by 13% or more.
회전형 휘발성 산화장치 이용 다공성 우라늄산화물 그래뉼 제조 연구
이재원 ( Jae Won Lee ),윤여완 ( Yeo Wan Yun ),신진명 ( Jin Myeong Shin ),이정원 ( Jung Won Lee ),박근일 ( Guen Il Park ),박장진 ( Jang Jin Park ) 한국공업화학회 2011 공업화학 Vol.22 No.6
회전형 휘발성 산화장치(voloxidizer)와 200 g U3O8 분말을 사용하여 초기 미세 입자층의 운동형태, 열처리 온도 및 시간, voloxidizer의 회전속도에 따른 다공성 그래뉼의 회수율과 특성을 분석하였다. 초기 미세 입자층의 운동형태에 따른 1 mm 이상의 그래뉼의 회수율은 rolling 운동 때보다 slumping 운동일 경우에 보다 높았다. 초기 미세 입자층이 rolling 운동형태인 경우에는 미세입자로부터 그래뉼이 생성됨에 따라서 slumping 운동형태로 변하며 slumping 빈도가 매우 높았다. 열처리 온도의 증가 및 10 h까지는 시간의 증가에 따라서 그래뉼의 회수율이 매우 크게 증가하였다. Slumping 운동형태를 보이는 초기 미세 입자층의 경우에 voloxidizer의 회전속도가 증가함에 따라서 그래뉼의 회수율은 81.5에서 88.7%로 증가하였으나, 그래뉼 특성 측면에서 보면 회전속도가 2 rpm인 경우에 밀도, 파쇄강도, 구형도가 가장 높았다. The fabrication characteristics of porous uranium oxide granules from U3O8 powder was investigated in terms of initial particle bed motions such as slumping and rolling, thermal treatment conditions, and rotational velocities in slumping motion using a rotary voloxidizer. With respect to the initial particle bed motion the recovery rate of granule of above 1 mm in slumping motion was higher than that in the rolling motion. Rolling motion was changed into slumping motion with high slumping frequency by formation of granules from fine particles. Recovery rate of granule significantly increased with the increas in thermal treatment temperature and time of upto 10 h. As the rotational velocity of voloxidizer in the case of the initial particle bed showing slumping motion increased, the recovery rate of granule increased from 81.5 to 88.7%. However, the rotational velocity of 2 rpm provided an effective density, crushing strength and sphericity of granules.