• 한국해양학회지:바다
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• 제18권4호
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• pp.227-233
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• 2013

경남 통영시 민양 잘피밭에 서식하는 어류의 종조성 및 계절 변동을 조사하기 위해 2011년 5월부터 2012년 4월까지 예인망(surf net)을 이용하여 매월 어류를 채집하였다. 조사기간 동안 총 25종 3,880개체 3,145.1 g의 어류가 채집되었다. 조사기간 동안 채집된 어류는 대부분 소형어나 유어들이었고, 그 중 우점종은 1,970개체가 채집된 살망둑(Gymnogobius heptacanthus)이였으며, 그물코쥐치(Rudarius ercodes), 베도라치(Pholis nebulosa), 별망둑(Chaenogobius gulosus), 날망둑(Gymnogobius castaneus) 순으로 채집되어 총 개체수의 89.1%를 차지하였다. 잘피밭 출현 어류는 수온이 대체적으로 높은 6-9월 사이 다수의 개체가 출현하였고, 수온이 낮은 1-2월에 개체수와 종수가 적게 나타나 수온의 영향을 받고 있는 것으로 보인다. 한편, 종 다양도지수(H')는 2012년 4월이 가장 높게 나타났다.

• 한국어류학회지
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• 제36권1호
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• pp.58-67
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• 2024

이 연구는 경남 통영 민양 잘피밭의 어류상 조사를 통해 월간 출현한 어종을 알아보고 같은 지역 선행연구에서 동일한 조사도구로 수행한 결과와 비교하고자 하였다. 조사는 2021년 3월부터 2022년 2월까지 예인망(surf net)으로 채집하여 어류의 종조성을 확인하였다. 조사 기간 동안 총 8목 14과 20속 24종 8,670개체, 3,715.42 g의 어류가 채집되었다. 우점종은 날망둑, 살망둑, 별망둑, 베도라치, 그물코쥐치로 전체 개체수의 95.9%를 차지하였다. 이번 연구에서 출현한 어류는 9년 전 수행된 선행연구와 유사하게 망둑어류가 대부분이었고, 오염지표종인 주둥치가 처음 출현을 하였다.

• 한국생산제조학회지
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• 제24권1호
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• pp.43-48
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• 2015

Silver nanowire (AgNW) is a material that is increasingly being used for transparent electrodes, as a substitute for indium tin oxide (ITO), owing to its flexibility, high transmittance to sheet resistance ratio, and simple production process. This study involves manufacturing large-area organic photovoltaic cells (OPVs) deposited on AgNW electrodes. We compared the efficiency of OPVs with ITO and AgNW electrodes. The results verified that an OPV with an AgNW electrode performed better than that with an ITO electrode. Furthermore, by using the knife coating method, we successfully fabricated large-area OPVs without the loss of efficiency. Use of AgNW instead of ITO demonstrated that an OPV could be produced on various substrates by the solution process method, dropping the productions costs significantly. Additionally, by using the knife coating method, the process time and amount of wasted solution are reduced. This leads to an increase in the efficient fabrication of the OPV.

• Nuclear Engineering and Technology
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• 제53권2호
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• pp.446-454
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• 2021

Critical heat flux (CHF) has traditionally been evaluated using look-up tables or empirical correlations for nuclear power plants. However, under complex moving condition, it is necessary to reconsider the CHF characteristics since the conventional CHF prediction methods would no longer be applicable. In this paper, the additional forces caused by motions have been added to the annular film dryout (AFD) mechanistic model to investigate the effect of moving condition on CHF. Moreover, a theoretical model of the natural circulation loop with additional forces is established to reflect the natural circulation characteristics of the loop system. By coupling the system loop with the AFD mechanistic model, a CHF prediction program called NACOM for natural circulation loop under moving condition is developed. The effects of three operating conditions, namely stationary, inclination and rolling, on the CHF of the loop are then analyzed. It can be clearly seen that the moving condition has an adverse effect on the CHF in the natural circulation system. For the calculation parameters in this paper, the CHF can be reduced by 25% compared with the static value, which indicates that it is important to consider the effects of moving condition to retain adequate safety margin in subsequent thermal-hydraulic designs.

• Nuclear Engineering and Technology
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• 제53권12호
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• pp.3902-3909
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• 2021

SACOS series of subchannel analysis codes have been developed by XJTU-NuTheL for many years and are being used for the thermal-hydraulic safety analysis of various reactor cores. To achieve fine whole core pin-level analysis, the input preprocessing and parallel capabilities of the code have been developed in this study. Preprocessing is suitable for modeling rectangular and hexagonal assemblies with less error-prone input; parallelization is established based on the domain decomposition method with the hybrid of MPI and OpenMP. For domain decomposition, a more flexible method has been proposed which can determine the appropriate task division of the core domain according to the number of processors of the server. By performing the calculation time evaluation for the several PWR assembly problems, the code parallelization has been successfully verified with different number of processors. Subsequent analysis results for rectangular- and hexagonal-assembly core imply that the code can be used to model and perform pin-level core safety analysis with acceptable computational efficiency.

• 대한본초학회지
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• 제34권1호
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• pp.33-42
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• 2019

Objectives : This study aimed to be used as basic data for obtaining excellent quality of Salvia miltiorrhiza (SM) root. Methods : SM cultivated in Anhui Bozou, Henan, Shandong, Henan Wenxian, Zhejiang, Hebei, Liaoning, Shanxi, Shaanxi Shangluo, Sichuan Zhongjiang, Sichuan Minyang and Jiangsu in China were gathered and its internal morphology and physicochemical patterns were analyzed. Results : Cross-section of sang plants according to cultivated regions in China showed that cork layers consisted of cells with four to six layers, cortex width was wide, and phloem was semilunar-shaped. Although there are forms layers, yet boundary was vague. It was observed that eight to ten vascular bundles were arranged in wooden parts in all directions and as a single line of vascular was distributed nearby form layers as it nears to the center. Tanshinon IIA identified a spot in the same location with standard product near by Rf 0.9 in the test identifying TLC of SM according to cultivated areas in China. The largest amount was 0.535% identified in Shandong and the lowest amount of 0.05% in Hebei. Salvianolic acid B identified a spot in the same location with standard product near by Rf 0.7 in the test identifying TLC of SM according to cultivated areas in China. The largest amount was 2.72% identified in Liaoning and the lowest amount of 0.825% in Jiangsu. Conclusions : The results are assumed to be used as basic data for obtaining excellent quality of SM oriental medical hers and distinguishing authentic or fake herbs.

• Nuclear Engineering and Technology
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• 제53권10호
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• pp.3217-3228
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• 2021

Flow blockage of the fuel assembly in the lead-based fast reactor (LFR) may produce critical local spots, which will result in cladding failure and threaten reactor safety. In this study, the flow blockage characteristics were analyzed with the sub-channel analysis method, and the circumferentially-varied method was employed for considering the non-uniform distribution of circumferential temperature. The developed sub-channel analysis code SACOS-PB was validated by a heat transfer experiment in a blocked 19-rod bundle cooled by lead-bismuth eutectic. The deviations between the predicted coolant temperature and experimental values are within ±5%, including small and large flow blockage scenarios. And the temperature distributions of the fuel rod could be better simulated by the circumferentially-varied method for the small blockage scenario. Based on the validated code, the analysis of blockage characteristics was conducted. It could be seen from the temperature and flow distributions that a large blockage accident is more destructive compared with a small one. The sensitivity analysis shows that the closer the blockage location is to the exit, the more dangerous the accident is. Similarly, a larger blockage length will lead to a more serious case. And a higher exit temperature will be generated resulting from a higher peak coolant temperature of the blocked region. This work could provide a reference for the future design and development of the LFR.