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Implementation of an LBE spallation target in an accelerator-driven molten salt subcritical reactor
Bak, Sang-In,Hong, Seung-Woo,Kadi, Yacine Atomic Energy Society of Japan 2017 Journal of nuclear science and technology Vol.54 No.8
<P>An accelerator-driven system (ADS) combined with a subcritical molten salt reactor (MSR) is a type of hybrid reactor originally designed to use Th/U (or U/Pu ) fuel cycles. In most accelerator-driven molten salt reactor (AD-MSR) concepts, the salt material is also used as a target for inducing spallation neutrons. Although a neutron source is an important component in the design of ADS, only a few studies have addressed the effects of the neutron spallation source in the AD-MSR. Incidentally, there is no quantitative study on how much the beam power can be reduced by installing a spallation target in a sodium chloride-based fast reactor. We studied the proton and the neutron source efficiencies of an AD-MSR with chloride fuels by considering an Lead Bismuth Eutectic (LBE) spallation target. This LBE target is found to increase the proton source efficiency significantly. The required beam power for an AD-MSR can be reduced by 33 % and 16 % for NaCl-Th/U-233 and NaCl-U/Pu fuels, respectively, relative to the AD-MSR without the LBE spallation target by keeping the same k(eff). The energy gain can be increased up to 1.5 times and 1.2 times for NaCl-Th/U-233 and NaCl-U/Pu fuels, respectively. Thus, incorporating a spallation target module in an AD-MSR can significantly reduce the burden on the accelerator.</P>
Study on a Coaxial Plasma Gun (III)
Bak, Hae-Ill,In, Sang-Ryul,Chung, Kie-Hyung,Lee, Un-Chul Korean Nuclear Society 1980 Nuclear Engineering and Technology Vol.12 No.3
A Mather type plasms gun is operated at below 1 torr with a energy storage system (4KJ, 16.5KV, 35nH) to study the conditions of the efficient plasma focus. When the $D_2$ gas filling pressure is 0.18 torr and the stored energy is 3.8KJ, the discharge current of max. 180KA is obtained and the average axial velocity of the plasma is about $7cm/\mu\textrm{s}$. This is lower than the calculated velocity with above conditions by the snow-plow model. The discrepancy is due to the currents flowing over the insulator surface. The plasma focus occurs at low pressure compared with the results obtained by Bruzzone. The reasons are such that the plasma gun employed in this experiment is large for tile stored energy and the concentration of the residual gas is comparatively high. It is confirmed by a Long counter that the neutrons are generated from the dense plasma focus.
In Eun Jin,Min Kyung Joo,Bak Sang-In,Kim Do Yoon,함철민,Shim Chungbo,Zhou Yujie,Hong Seung-Woo,Park Tae-Sun,Shin Jae Won,Bhoraskar V. N. 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.9
The cross sections of 89Y(n,3n)87m,87gY and 209Bi(n,4n)206Bi reactions at a neutron energy of 30 MeV are measured by making use of neutron beams of continuous energy spectra and a subtraction method. By impinging proton beams of 30 and 35 MeV to a thick beryllium target, neutron beams of continuous and broad energy spectra are produced and are guided to Y and Bi sample targets. The difference between the two neutron spectra generated by two neighboring proton energies is found to be peaked in a narrow energy range and thus can be regarded as quasi-monoenergetic, which can be used to extract (n,xn) cross sections. The uncertainty in the neutron fluence is reduced by analyzing the activities of aluminum and niobium reference samples placed on top of the Y and Bi samples. The use of a subtraction method by employing neutron beams of continuous energy spectra gives us the 89Y(n,3n)87m,87gY and 209Bi(n,4n)206Bi cross sections in fair agreement with the existing experimental data and nuclear data libraries.
Plasma Initiation in the KAERIT Tokamak
In, Sang-Ryul,Bak, Hae-Ill Korean Nuclear Society 1988 Nuclear Engineering and Technology Vol.20 No.4
Experiments on the hydrogen gas breakdown for plasma initiation in the KAERIT tokamak are described. The influence of the applied loop voltage, toroidal magnetic field, gas filling pressure, error magnetic field, and preionization is studied. It is concluded that the magnitude of the error field is the most important factor for successful discharge initiation. The gas breakdown voltage becomes minumum when the external compensating field most effectively corrects the net error field. Even though preionization effect is not prominent, it is exhibited more easily in the case of worse confinement. Discharge initiation conditions experimentally determined are compared with those calcuated from a theoretical model. Some other unknown physical processes maintain the operation range somewhat narrower than predicted by the present theoretical model. However, this model is adequate for the breakdown phase of tokamaks.
김인식(In-Sik Kim),김이국(Lee-Kook Kim),박재용(Jai-Yong Bak),이상우(Sang-Woo Lee),김충년(Chung-Nyun Kim),지승욱(Seung-Wook Jee) 한국조명·전기설비학회 2001 한국조명·전기설비학회 학술대회논문집 Vol.2001 No.-
In this paper, reduction characteristics of the ac flashover voltage in the horizontal air gap of sphere-sphere and needle-needle electrode system were investigated when the combustion flame was present near the high-voltage electrodes. The reduction characteristics of ac flashover voltage were discussed with the thermal ionization process, the relative air density and the deflection phenomena in the shape of flames that changed by the corona wind and coulomb‘s force. As the results of an experimental, it was found that the reduction of flashover voltages in sphere-sphere system, in comparison with the no-flame case, are 79.9[%] for k=0, 82.9[%] for k=0.5, 87.5[%] for k=1.0, 85.0[%] for h=0[cm], 40.8[%] for h=5[cm] and 28.2[%] for h=9[cm] when ac voltage is applied.
대용량 소포영상에서 관심영역 고속추출 방법에 관한 연구
박문성,박상은,김인수,김혜규,정회경,Park, Moon-Sung,Bak, Sang-Eun,Kim, In-Soo,Kim, Hye-Kyu,Jung, Hoe-Kyung 한국정보처리학회 2004 정보처리학회논문지D Vol.11 No.3
In this paper, we propose a sequence of method which extrats ROIs(Region of Interests) rapidly from the parcel image of large size. In the proposed method, original image is spilt into the small masks, and the meaningful masks, the ROIs, are extracted by two criterions sequentially The first criterion is difference of pixel value between Inner points, and the second is deviation of it. After processing, some informational ROIs-the areas of bar code, characters, label and the outline of object-are acquired. Using diagonal axis of each ROI and the feature of various 2D bar code, the area of 2D bar code can be extracted from the ROIs. From an experiment using above methods, various ROIs are extracted less than 200msec from large-size parcel image, and 2D bar code region is selected by the accuracy of 100%. 본 문은 고속으로 이송되는 컨베이어 벨트 환경에서 획득된 대용량 소포 영상에서 다양한 관심영역(ROI:Region of Interest)을 고속 추출할 수 있는 방법을 제안한다. 제안된 방법의 친 번째 단계에서는 영상을 32${\times}$32 픽셀 크기의 마스크로 나누고 그 중 내부 픽셀의 최대값과 최소값의 차이값이 최저 동적 입계값보다 큰 경우에 1차 후보로 검출한다. 두 번째 단계에서는 1차 후보 마스크를 다시 8${\times}$8크기의 서브마스크로 나누고 적셀 값의 편차(deviation)을 기준으로 최저 임계값보다 큰 마스크만 남김으로서 불필요한 영역을 제거한다. 이러한 전처리 과정을 거쳐 1차원 바코드, 2차원 바코드, 소포의 외형 경계, 레이블 및 문자와 같은 소포의 정보가 기록되어 있는 영역(ROI)을 제외한 나머지 영역을 제거한다. 후처리 과정에서는 위의 ROI 중 2차원 바코드 영역만을 추출하기 위해서 각각의 ROI에 대하여 기준축을 생성한 결과를 이용하여 각각의 영역을 검증하였다. 이와 같은 방법으로 실험한 결과 대용량 소포영상에서 약 200msec 이내에 다양한 ROI를 추출하였으며 100%의 정확도로 2차원 바코드 영역을 지정할 수 있음을 확인하였다.
Sucrose 첨가량에 따른 초당옥수수(Zea mays saccharate Sturt.) 잼의 품질 특성
박상범(Sang-Beom Park),박우현(Woo-Hyeon Park),차승현(Seung-Hyeon Cha),한인범(In-Beom Han),박세림(Se-Lim Bak),소윤섭(Yoon-Sup So),현태경(Tae Kyung Hyun),이신영(Shin-Young Lee),장금일(Keum-Il Jang) 한국식품영양과학회 2022 한국식품영양과학회지 Vol.51 No.4
초당옥수수의 활용 및 부가가치 향상을 위하여 본 연구에서는 초당옥수수 추출액에 30, 40, 50%(w/w) sucrose, 펙틴, 레몬즙을 이용한 SCJS와 동일한 조건에서 버터를 첨가한 SCJSB를 제조하여 일반성분과 품질 및 관능 특성을 비교분석하였다. 먼저 sucrose 첨가량이 증가할수록 SCJS와 SCJSB 제조를 위한 가열시간이 감소하면서 수분함량은 증가했지만, 조단백질, 조지방, 탄수화물은 감소하였으며, SCJS와 SCJSB 간 수분함량과 탄수화물은 유사하였고 조단백질과 조지방은 SCJSB가 높지만, 조회분 함량은 SCJS가 높게 측정되었다. 그리고 품질 특성으로 pH, 수율, L값 및 퍼짐성은 증가했지만, 총산도, 점도, a값, b값 및 조직감은 감소하는 경향을 나타내었으며, SCJS와 SCJSB 간에는 대부분의 품질 특성이 유사하였으나, 조직감은 SCJS가 SCJSB보다 높게 측정되었다. 관능 특성에서는 SCJSB가 SCJS보다 높은 기호도를 나타내었는데, 특히 SCJSB40이 가장 높은 기호도를 나타내었다. 결론적으로 초당옥수수를 이용한 잼의 제조가 가능함을 확인할 수 있었으며, 이와 같은 결과를 이용하여 초당옥수수의 부가가치 향상을 위한 정보와 잼 가공산업에 활용 가치 향상을 위한 기초 자료를 제공하였다고 생각된다. Super sweet corn has a high sugar content as this is not converted to starch during storage due to the shrunken-2 gene, which inhibits the activation of ADP‐glucose pyrophosphorylase. However, the quality of super sweet corn deteriorates during long-term storage because of the hardening of the peels, damage due to pests, and the fact that disease organisms are attracted by the high sugar content. To avoid quality loss during storage, super sweet corn can be stored as jam. We prepared two types of super sweet corn jam, one with sucrose (SCJS) and the other one with sucrose and butter (SCJSB), and analyzed their proximate composition, quality, and sensory characteristics. With an increase in the amount of sucrose added during preparation, the required heating time, total acidity, viscosity, a-value, b-value, texture, and contents of protein, fat, and carbohydrate decreased, while the moisture content, pH, yield, L-value, and spreadability increased. The moisture and carbohydrate contents of SCJS and SCJSB were similar. However, the protein and fat contents were higher in SCJSB, and ash content was higher in SCJS. Most quality characteristics of the two types of jam were similar, but the texture was observed to be better in SCJS. In terms of sensory characteristics, SCJSB was preferred over SCJS, and in particular, SCJSB40 prepared with 40% (w/w) sucrose based on super sweet corn extracts received the highest preference. In conclusion, we confirmed that super sweet corn can be processed into jam, thus improving its storage characteristics, and the present results could be used as a basis for the industrial production of super sweet corn jam.