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고연소도 경수로 사용후핵연료의 열처리에 따른 세슘 방출거동
박근일,조광훈,이정원,박장진,양명승,송기찬,Park, Geun-Il,Cho, Kwang-Hun,Lee, Jung-Won,Park, Jang-Jin,Yang, Myung-Seung,Song, Kee-Chan 한국방사성폐기물학회 2007 방사성폐기물학회지 Vol.5 No.1
The dynamic release behavior of Cs from high burn-up spent PWR fuel was experimentally performed under the conditions of a thermal treatment process such as voloxidation and sintering conditions. In voloxidation process, influence of the oxidation and reduction atmosphere on the Cs release characteristic using fragment type of spent fuel heated up to $1,500^{\circ}C$ was compared. In sintering process, temperature history effect on Cs release behavior was evaluated using green pellet under 4% $H_2/Ar$ environment. Temperature range for complete Cs release from spent fuel fragment under voloxidation condition was about $800^{\circ}C{\sim}1,200^{\circ}C$, but that of green pellet under the reduction atmosphere was $1,100^{\circ}C{\sim}1,400^{\circ}C$. Key parameters on Cs release behavior from spent fuel was powder formation as well as the diffusion rate of Cs compound to grain boundary and fuel surface.
사용후핵연료의 연소도 변화에 따른 산화 및 OREOX 공정에서 핵분열기체 방출 특성
박근일,조광훈,이정원,박장진,양명승,송기찬,Park, Geun-Il,Cho, Kwang-Hun,Lee, Jung-Won,Park, Jang-Jin,Yang, Myung-Seung,Song, Kee-Chan 한국방사성폐기물학회 2007 방사성폐기물학회지 Vol.5 No.1
Quantitative analysis on release behavior of the $^{85}Kr\;and\;^{14}C$ fission gases from the spent fuel material during the voloxidation and OREOX process has been performed. This thermal treatment step in a remote fabrication process to fabricate the dry-processed fuel from spent fuel has been used to obtain a fine powder The fractional release percent of fission gases from spent fuel materials with burn-up ranges from 27,000 MWd/tU to 65,000 MWd/tU have been evaluated by comparing the measured data with these initial inventories calculated by ORIGEN code. The release characteristics of $^{85}Kr\;and\;^{14}C$ fission gases during the voloxidation process at $500^{\circ}C$ seem to be closely linked to the degree of conversion efficiency of $UO_2\;to\;U_3O_8$ powder, and it is thus interpreted that the release from grain-boundary would be dominated during this step. The high release fraction of the fission gas from an oxidized powder during the OREOX process would be due to increase both in the gas diffusion at a temperature of $500^{\circ}C$ in a reduction step and in U atom mobility by the reduction. Therefore, it is believed that the fission gases release inventories in the OREOX step come from the inter-grain and inter-grain on $UO_2$ matrix. It is shown that the release fraction of $^{85}Kr\;and\;^{14}C$ fission gases during the voloxidation step would be increased as fuel burn-up increases, ranging from 6 to 12%, and a residual fission gas would completely be removed during the OREOX step. It seems that more effective treatment conditions for a removal of volatile fission gas are of powder formation by the oxidation in advance than the reduction of spent fuel at the higher temperature.
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.
송주형 ( Ju Hyung Song ),예병덕 ( Byong Duk Ye ),윤용식 ( Yong Sik Yoon ),김미정 ( Mi Jung Kim ),양동훈 ( Dong Hoon Yang ),정기욱 ( Kee Wook Jung ),김경조 ( Kyung Jo Kim ),변정식 ( Jung Sik Byeon ),명승재 ( Seung Jae Myung ),양석 대한장연구학회 2011 Intestinal Research Vol.9 No.1
Ganglioneuromas of the gastrointestinal tract are rare, but have an established association with genetic disorders, such as the multiple endocrine neoplasia (MEN) syndrome (type 2b) and neurofibromatosis (type 1). However, solitary ganglioneuromas are not associated with an increased risk for MEN 2b, neurofibromatosis type 1, or any other systemic conditions. Ganglioneuromas of the gastrointestinal tract have been reported to predominantly involve the colon and rectum, and are thereby occasionally detected during colonoscopy or surgery. Although there are no characteristic symptoms of solitary ganglioneuromas, symptoms can be induced by solitary ganglioneuromas, such as abdominal pain, bleeding, or obstruction, depending on the location and size. Herein we report a case of a solitary ganglioneuroma of the ileum. A 34-year-old man sought evaluation at our hospital for anemia. The medical and family histories were benign and there was no history of genetic disorders. The evaluation for anemia revealed iron-deficiency anemia and CT enterography revealed a single mass in the ileum. Laparoscopic resection of the lesion was performed and the pathologic examination confirmed an ileal ganglioneuroma. (Intest Res 2011;9:46-50)
김광운 ( Gwang Un Kim ),예병덕 ( Byong Duk Ye ),변정식 ( Jeong Sik Byeon ),박환성 ( Hwan Sung Park ),옥태진 ( Tae Jin Ok ),양동훈 ( Dong Hoon Yang ),정기욱 ( Kee Wook Jung ),김경조 ( Kyung Jo Kim ),명승재 ( Seung Jae Myung ),양석 대한장연구학회 2011 Intestinal Research Vol.9 No.3
Background/Aims: With the growing volume of screening colonoscopies, the incidence of rectal carcinoids and the number of endoscopic resections for rectal carcinoids are also increasing. However, the prognosis including recurrence and metachronous lesions after endoscopic resection is unclear. Methods: The medical records of 255 patients who had undergone endoscopic resection for rectal carcinoids between October 1999 and April 2010 were retrospectively reviewed. Results: The number of males was 150 (58.8%), and the mean age was 54.1 years (range, 27-85 years). Mean tumor size was 6.9 mm. In total, 162 cases (63.5%) were treated with endoscopic mucosal resection and 93 (36.5%) were treated with endoscopic submucosal dissection. Although endoscopic complete resections were achieved in all cases, the histological examination showed 47 cases with a positive resection margin (18.4%) and three with lymphovascular invasion (1.2%). In the 54 patients with a free resection margin, who were followed for more than 12 months, abdominopelvic computed tomography and endoscopy did not show recurrence after a median of 30.5 and 36 months, respectively. Three patients with lymphovascular invasion did not show recurrence during follow-up period of 13, 30, and 37 months, respectively. Metachronous rectal carcinoids were detected in four patients at 23, 58, 61, and 89 months, respectively, after initial endoscopic resection, leading to a second endoscopic treatment. Conclusions: Small rectal carcinoids completely resected grossly and pathologically without lymphovascular invasion appear to have low probability of short-term recurrence. However, considering the slow growth rate of carcinoids, long-term follow-up for recurrence and metachronous carcinoids is required. (Intest Res 2011;9:217-224)
이재영,양명승 대한금속재료학회(대한금속학회) 1975 대한금속·재료학회지 Vol.13 No.2
순수 용융동 내에서의 수소의 확산계수를 unsteady-state gas liquid metal diffusion cell방법을 이용해서 구하였다. Diffusion cell은 1기압의 수소를 포함하는 알루미나관을 정지상태의 용융동내에 삽입시킴으로서 형성된다. 확산계수는 Fick의 제2법칙의 해를 변형시킨 식을 이용해서 계산하였다. 수소의 확산계수에 대한 silicon 합금 원소의 영향도 고찰하였다. 정지상태의 순수 용융동 속으로의 수소의 흡수 속도는 확산에 의해서 지배됨을 알 수 있었다. 순수 용융동 내에서의 수소의 확산계수, D_H는 1090℃에서 1205℃의 온도 범위에서는 다음과 같은 식으로 표시된다. D_H=5.028×10^(-2)=exp (-2,628±1,290/RT)㎠/sec The diffusivity of hydrogen in pure liquid copper was determined by an unsteady-state gas liquid metal diffusion cell technique. The diffusion cell was formed by immersing an alumina tube containing hydrogen gas at 1 atm. in a bath of stagnant liquid copper. Diffusivities were calculated from the appropriate solution of Fick's 2nd law. The effect of silicon, an alloying element, on the diffusion of hydrogen was also investigated. The absorption of hydrogen in stagnant pure liquid copper has been found to be diffusion controlled. The calculated diffusivities, D_H for hydrogen in pure liquid copper can be described by the equation: D_H=5.028×10^(-2)=exp(-2,628±1,290/RT)㎠/sec in the temperature range of 1,090℃-1,205℃.
박원구,김한수,이종무,양명승,손승현 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.6
In manufacturing pressurized heavy water reactor fuel bundles, bearing pads and inter-element spacers are brazed onto Zircalloy-4 cladding tube. To investigate the changes of mechanical properties of the cladding tube caused by the brazing, the phase transformation characteristics were studied under the various heat treatment conditions. The rupture characteristics of the brazed cladding tube were studied by the out-of-pile biaxial burst test and biaxial creep rupture test. The effect of brazing on the mechanical anisotropy was studied by the flow surface technique. The critical cooling rates for different structures could be determined by examining the microstructure : 0.2 ℃/s for the lenticular structure, 2 ℃/s for the parallel plate structure, and 11℃/s for the basketweave structure. The failure occurred in the brazed area under the burst deformation teat at 400℃. However, under the creep test at 400 ℃, the virgin area, i.e., cold worked and stress relieved structure, showed failure. This seems to result from activating of the different slip systems, i.e., {101 ̄0}$lt;12 ̄10$gt; in the brazed area and {l1 ̄01}$lt;112 ̄3$gt; and {112 ̄1}$lt;112 ̄3$gt; in the virgin area, as well as from the different degree of anisotropy. The tensile strength at 400℃ of the brazed area was higher than the one of the virgin area.