• 한국철학논집
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• 제23호
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• pp.181-216
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• 2008

이 글에서는 민이승(閔以升) 사상 가운데 주로 1)지와 지각의 문제, 즉 심성(心性)의 구분에 관한 논의문제, 이와 관련하여 펼쳐진 2)정제두와의 양지 지각의 동이성 문제에 관한 논의 등으로 나누어 살펴본다. 민이승은 양명학자 정제두와 양명학의 시비문제를 둘러싸고 논쟁을 전개하고 있는데, 그 내용은 양명학의 중심개념인 양지와 지각의 동이문제이다. 또한 민이승은 양지와 지각 논쟁의 연장선상에서 김창협과 지(智)와 지각(知覺)의 동이문제를 둘러싸고 논쟁한다. 민이승은 정제두와의 양명학 논쟁에서 양명학의 '심즉리'설과 '지행합일'설에 대해 부정하고 있으며, 양명학의 중심개념인 양지는 천리와는 구분된 지각으로 파악하고 있다. 정제두와 양지와 지각의 관계에 대해 논쟁하고 있는 민이승은 당시 학계에서 진행되고 있었던 지와 지각의 관계에 관심을 가지게 된다. 이 결과, 민이승은 김창협과 지와 지각의 동이문제에 대해 한차례 논쟁을 벌이게 된다. 민이승과 김창협 사이에 전개된 지와 지각의 관계에 대한 논의는 지와 지각의 관계를 불상잡(不相雜)의 측면에서 보느냐 아니면 불상치의 측면에서 보느냐 하는 차이점에 있다. 김창협은 지와 지각이 서로 섞일 수 없다는 불상잡의 입장을 강조하는 데 비해, 민이승은 지와 지각의 관계를 불상리의 입장에서 양자의 연관성에 주목하고 있다. '양지와 지각의 동이문제', '지와 지각의 동이문제'라는 논쟁 주제를 중심으로 양자의 입장 차이를 살펴보고, 이러한 논쟁이 사상사적으로 어떠한 의의가 있는가 살펴보기로 한다.

• Nuclear Engineering and Technology
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• 제52권2호
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• pp.258-270
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• 2020

A new task of using the Jacobian-Free-Newton-Krylov (JFNK) method for the PWR core transient simulations involving neutronics, thermal hydraulics and mechanics is conducted. For the transient scenario of PWR, normally the Picard iteration of the coupled coarse-mesh nodal equations and parallel channel TH equations is performed to get the transient solution. In order to solve the coupled equations faster and more stable, the Newton Krylov (NK) method based on the explicit matrix was studied. However, the NK method is hard to be extended to the cases with more physics phenomenon coupled, thus the JFNK based iteration scheme is developed for the nodal method and parallel-channel TH method. The local gap conductance is sensitive to the gap width and will influence the temperature distribution in the fuel rod significantly. To further consider the local gap conductance during the transient scenario, a 1D mechanics model is coupled into the JFNK scheme to account for the fuel thermal expansion effect. To improve the efficiency, the physics-based precondition and scaling technique are developed for the JFNK iteration. Numerical tests show good convergence behavior of the iterations and demonstrate the influence of the fuel thermal expansion effect during the rod ejection problems.

• Nuclear Engineering and Technology
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• 제48권2호
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• pp.339-350
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• 2016

Based on the resonance integral (RI) tables produced by the NJOY program, the conventional subgroup method usually ignores both the resonance elastic scattering and the resonance interference effects. In this paper, on one hand, to correct the resonance elastic scattering effect, RI tables are regenerated by using the Monte Carlo code, OpenMC, which employs the Doppler broadening rejection correction method for the resonance elastic scattering. On the other hand, a fast resonance interference factor method is proposed to efficiently handle the resonance interference effect. Encouraging conclusions have been indicated by the numerical results. (1) For a hot full power pressurized water reactor fuel pin-cell, an error of about +200 percent mille could be introduced by neglecting the resonance elastic scattering effect. By contrast, the approach employed in this paper can eliminate the error. (2) The fast resonance interference factor method possesses higher precision and higher efficiency than the conventional Bondarenko iteration method. Correspondingly, if the fast resonance interference factor method proposed in this paper is employed, the $k_{inf}$ can be improved by ~100 percent mille with a speedup of about 4.56.

• Nuclear Engineering and Technology
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• 제42권1호
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• pp.47-54
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• 2010

The SuperCritical Water-cooled Reactor (SCWR) pursues high power density to reduce its capital cost. The fast spectrum SCWR, called a super fast reactor, can be designed with a higher power density than thermal spectrum SCWR. The mechanism of increasing the average power density of the super fast reactor is studied theoretically and numerically. Some key parameters affecting the average power density, including fuel pin outer diameter, fuel pitch, power peaking factor, and the fraction of seed assemblies, are analyzed and optimized to achieve a more compact core. Based on those sensitivity analyses, a compact super fast reactor is successfully designed with an average power density of 294.8 W/$cm^3$. The core characteristics are analyzed by using three-dimensional neutronics/thermal-hydraulics coupling method. Numerical results show that all of the design criteria and goals are satisfied.

• Nuclear Engineering and Technology
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• 제45권4호
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• pp.529-538
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• 2013

Scattered photons cause blurring and distortions in flash radiography, reducing the accuracy of image reconstruction significantly. The effect of the scattered photons is taken into account and an iterative deduction of the scattered photons is proposed to amend the scattering effect for image restoration. In order to deduct the scattering contribution, the flux of scattered photons is estimated as the sum of two components. The single scattered component is calculated accurately together with the uncollided flux along the characteristic ray, while the multiple scattered component is evaluated using correction coefficients pre-obtained from Monte Carlo simulations.The arbitrary geometry pretreatment and ray tracing are carried out based on the customization of AutoCAD. With the above model, an Iterative Procedure for image restORation code, IPOR, is developed. Numerical results demonstrate that the IPOR code is much more accurate than the direct reconstruction solution without scattering correction and it has a very high computational efficiency.

• 동양고전연구
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• 제67호
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• pp.327-344
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• 2017

Zhou Dunyi is regarded as a precursor of Li-Xue, which is called Neo-Confucianism. So, it could be say that Zhou Dunyi is a precursor of Song-Ming-Li-Xue. As is well known, Zhu xi is a synthesizer of Li-Xue in Song Dynasty, which is called Dao-Xue; Wang Yangming is a synthesizer of Li-Xue in Ming Dynasty, which is called Xin-Xue. Dao-Xue and Xin-Xue were engaged in an unyielding confrontation for many centuries in Asian areas. It is certain that Dao-Xue and Xin-Xue both succeed to the resources of Zhou Dunyi together, but it is not easy to confirm that the resources of Zhou Dunyi are common to both sides taking an unyielding confrontation into consideration. Usually, Zhou Dunyi is recognized as a Master of Dao-Xue rather than Xin-Xue. But in this paper, I try to give a question to this prevalent view, like this: Yang-Ming-Xin-Xue much absorbed and developed the Thought of Zhou Dunyi than Zhu-Xi-Dao-Xue did. In order to prove this assertion, I take two steps. The first is about Daotong, the second is about sincerity. In conclusion, while Wang Yangming build his own thought of moral philosophy, he fully absorbed Zhou Dunyi's thought of sincerity, and concreted his typical moral philosophy, which is Liangzhi-Xue. I could say that besides the viewpoint of Zhu xi, there is another viewpoint of Wang Yangming to understand the thought of Zhou Dunyi properly.

• 동양고전연구
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• 제34호
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• pp.363-385
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• 2009

나는 모종삼의 도덕적 형이상학을 비판하면서 숭고미에 대한 칸트의 분석을 통해 그 대안을 제시하려고 한다. (1) 모종삼의 도덕적 형이상학은 과학적 세계관과 충돌한다. (2) 칸트의 심미적 공간은 과학적 세계관과 충돌하지 않은 채 도덕적 형이상학이 요구하는 조건들을 충족시킬 수 있다. (3) 모종삼이 주장하는 맹자의 자율도덕은 도덕적 명령으로서 정언명법을 정당화하지 못한다. (4) 바로 이 점에서 칸트가 주장하는 숭고미가 중요한 역할을 한다. (5) 훈련된 숭고미에 대한 감정을 통해 자율적인 도덕 행위를 할 수 있는 가능성이 마련된다.

• Journal of Microbiology and Biotechnology
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• 제26권4호
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• pp.700-709
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• 2016

The mitogen-activated protein kinase HOG1 (high-osmolarity glycerol response pathway) plays a crucial role in the response of yeast to hyperosmotic shock. Trichosporonoides oedocephalis produces large amounts of polyols (e.g., erythritol and glycerol) in a culture medium. However, the effects of HOG1 gene knockout and environmental stress on the production of these polyols have not yet been studied. In this study, a To-HOG1 null mutation was constructed in T. oedocephalis using the loxP-Kan-loxP/Cre system as replacement of the targeted genes, and the resultant mutants showed much smaller colonies than the wild-type controls. Interestingly, compared with the wild-type strains, the results of shake-flask culture showed that To-HOG1 null mutation increased erythritol production by 1.44-fold while decreasing glycerol production by 71.23%. In addition, this study investigated the effects of citric acid stress on the T. oedocephalis HOG1 null mutants and the wild-type strain. When the supplementation of citric acid in the fermentation medium was controlled at 0.3% (w/v), the concentration of erythritol produced from the wild-type and To-HOG1 knockout mutant strains improved by 18.21% and 21.65%, respectively.

• Nuclear Engineering and Technology
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• 제55권9호
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• pp.3450-3463
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• 2023

In the two-step analysis of Pebble-Bed type High-Temperature Gas-Cooled Reactor (PB-HTGR), the lattice physics calculation for the generation of homogenized cross-sections is based on the fuel pebble. However, the randomly-dispersed fuel particles in the fuel pebble introduce double heterogeneity and randomness. Compared to the deterministic method, the Monte Carlo method which is flexible in geometry modeling provides a high-fidelity treatment. Therefore, the Monte Carlo code NECP-MCX is extended in this study to perform the lattice physics calculation of the PB-HTGR. Firstly, the capability for the simulation of randomly-dispersed media, using the explicit modeling approach, is developed in NECP-MCX. Secondly, the capability for the generation of the homogenized cross-section is also developed in NECP-MCX. Finally, simplified PB-HTGR problems are calculated by a two-step neutronics analysis tool based on Monte Carlo homogenization. For the pebble beds mixed by fuel pebble and graphite pebble, the bias is less than 100 pcm when compared to the high-fidelity model, and the bias is increased to 269 pcm for pebble bed mixed by depleted fuel pebble. Numerical results show that the Monte Carlo lattice physics calculation for the two-step analysis of PB-HTGR is feasible.

• Nuclear Engineering and Technology
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• 제55권4호
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• pp.1280-1286
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• 2023

MgF₂ as a moderator material has been extensively used in the beam shaping assembly (BSA) that plays an important role in the boron neutron capture therapy (BNCT). Regarded as important for applications, the thermal neutron scattering data of MgF₂ were calculated, based on the phonon expansion model. The structural properties of MgF₂ were researched by the VASP code based on the ab-initio methods. The PHONOPY code was employed to calculate the phonon density of states. Furthermore, the NJOY code was used to calculate the thermal neutron scattering data of MgF₂. The calculated inelastic cross sections plus absorption cross sections are in agreement with the available experimental data. The neutron transport in the BSA has been simulated by using a hybrid Monte-Carlo-Deterministic code NECP-MCX. The results indicated that compared with the calculation of the free gas model, the thermal neutron flux and epithermal neutron flux at the BSA exit port calculated by using the thermal neutron scattering data of MgF₂ were reduced by 27.7% and 8.2%, respectively.