• Nuclear Engineering and Technology
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• v.55 no.9
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• pp.3213-3228
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• 2023

As an important part of the digital reactor, the pin-by-pin wise fine coupling calculation is a research hotspot in the field of nuclear engineering in recent years. It provides more precise and realistic simulation results for reactor design, operation and safety evaluation. CORCA-K a nodal code is redeveloped as a robust pin-by-pin wise neutronics and thermal-hydraulic coupled calculation code for pressurized water reactor (PWR) core. The nodal green's function method (NGFM) is used to solve the three-dimensional space-time neutron dynamics equation, and the single-phase single channel model and one-dimensional heat conduction model are used to solve the fluid field and fuel temperature field. The mesh scale of reactor core simulation is raised from the nodal-wise to the pin-wise. It is verified by two benchmarks: NEACRP 3D PWR and PWR MOX/UO₂. The results show that: 1) the pin-by-pin wise coupling calculation system has good accuracy and can accurately simulate the key parameters in steady-state and transient coupling conditions, which is in good agreement with the reference results; 2) Compared with the nodal-wise coupling calculation, the pin-by-pin wise coupling calculation improves the fuel peak temperature, the range of power distribution is expanded, and the lower limit is reduced more.

• Journal of the Chungcheong Mathematical Society
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• v.36 no.3
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• pp.171-180
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• 2023

Investigating local dynamics requires precise control to effectively manage the subtle differences that distinguish it from global dynamics. This paper aims to study the localized perspective of the recently proposed continuum-wise expansive measures [13]. Let f : M → M be a diffeomorphism on a closed smooth manifold M and let p be a hyperbolic periodic point of f. We prove that if the homoclinic class H_f (p) of f associated to p is C¹-robustly measure continuum-wise expansive then it is hyperbolic.

• Journal of Korean Elementary Science Education
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• v.31 no.1
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• pp.1-12
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• 2012

The purpose of this study was to explore instructional objectives of 'Wise Life' based on Bloom's Revised Taxonomy of Educational Objectives. It was to extend understanding the 7th and the revised Wise Life 2007 as well. The written objectives of two curriculum of Wise Life were divided into two, the 'knowledge' dimension and the 'cognitive process' dimension based on Bloom's Revised Taxonomy of Educational Objectives. Major activity subjects presented in the 7th and the revised Wise Life 2007 were dominantly the basic inquiry activity types. It was found from this research that the 'factual' knowledge of the 'knowledge' dimension and the 'understand' of the 'cognitive process' dimension took a large proportion of the revised Wise Life 2007 objectives. The 'meta-cognitive' knowledge was increased. 'Remember' of the 'cognitive process' dimension was decreased and the high level objectives as 'analyze' and 'create', in the 'cognitive process' dimension was increased from the 7th to the revised curriculum. The 'factual' knowledge, 'conceptual' knowledge and 'metacognitive' knowledge were engaged with 'understand' and the 'procedural' knowledge were engaged with 'apply'. The 'meta- cognitive' were engaged with 'create' is the 'procedural' knowledge in the revised Wise Life 2007. 'Remember' was decreased. 'Create' was increased in the basic inquiry activities. It was analysed in zero percent of 'Observing', 'Investigating and Presenting', and 'Making'.

• Asian-Australasian Journal of Animal Sciences
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• v.2 no.3
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• pp.289-291
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• 1989

• Journal of the Chungcheong Mathematical Society
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• v.29 no.1
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• pp.151-155
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• 2016

In this paper, we show that if a continuum-wise expansive homeomorphism on a compact connected metric space is shadowing then it is topologically stable. This generalizes the main result of [4].

• Korean Journal of Mathematics
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• v.16 no.4
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• pp.537-543
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• 2008

Guan and Li [2] obtained SLLN for weighted sums of level-wise independent fuzzy random variables. In this paper, a generalization of Guan and Li [2] is obtained by using the Skorokhod metric on F(R).

• Journal of the Chungcheong Mathematical Society
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• v.36 no.2
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• pp.93-97
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• 2023

Let f : M → M be a diffeomorphism of two dimensional manifold M. If f has a homoclinic tangency associated to a hyperbolic periodic point p then there is a diffeomorphism g : M → M with C¹ close to f such that g is not continuum-wise expansive.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1406-1407
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• 2009

본 연구에서는 하드웨어적으로 제한사항이 있는 장비에서 최소한의 보안성을 제공하기 위해 XOR 방식의 Pair-wise 키값을 생성하는 간단한 보안기법을 제안한다. 제안한 보안 기법은 Random Key Predistribution 을 통하여 장비별 시간값과 고유값을 XOR 하여 서로 교환한 후, 상호 교환한 값을 다시 XOR 하여 두 장비간의 Pair-wise 키값을 생성한다. 이후, 지속적으로 변화되는 시간값으로 인해 매 통신시마다 다른 Pair-wise 키값을 사용할 수 있을 것이다. 기존의 보안알고리즘(DES, AES 등)의 연산 보다 매우 간단하고, 노드별 독특한 키 변화패턴을 통하여 키 유출이 어려우며, 장비가 캡처당하는 공격이 발생하더라도 전체 네트워크의 보안성이 저하되지 않는다는 장점을 가진다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2024.01a
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• pp.275-276
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• 2024

본 논문에서는 고객들이 쉽게 맛집을 찾고 예약할 수 있는 서비스를 제공하기 위해 웹 플랫폼인 Wait-Wise (ver.업주)와 WPMG, 하이브리드 앱인 Wait-Wise (ver.고객)과 포스시스템인 Pos-Ting이다. Wait-Wise (ver.고객)을 통해서 예약한 정보를 Pos-Ting에서 예약자명, 인원 수, 좌석, 예약번호와 같은 유요한 정보들을 업주에게 제공해주고, 업주는 Wait-Wise (ver.업주)을 통해서 매장정보, 메뉴정보, 테이블정보 저장하여 고객에게 Wait-Wise (ver.고객)을 통해서 정보를 제공하고, 관리자는 WPMG를 통해서 메뉴정보 저장하여 Pos-Ting에 정보를 제공한다. 일반 예약 어플리케이션은 예약시간만 지정할 수 있는데 반해 본 프로젝트는 예약 테이블을 지정하여 고객에 선택의 폭을 넓혀 원하는 시간과 원하는 자리에서 식사를 할 수 있게끔 본 프로젝트를 개발하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.6
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• pp.319-327
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• 2016

In this paper we investigate that most of plants and animals have the symmetric property, such as a tree or a sheep's horn. In addition, the human body is also symmetric and contains the DNA. We can see the logarithm helices in Fibonacci series and animals, and helices of plants. The sunflower has a shape of circle. A circle is circular symmetric because the shapes are same when it is shifted on the center. Einstein's spatial relativity is the relation of time and space conversion by the symmetrically generalization of time and space conversion over the spacial. The left and right helices of plants and animals are the symmetric and have element-wise inverse relationships each other. The weight of center weight Hadamard matrix is 2 and is same as the base 2 of natural logarithm. The helix matrices are symmetric and have element-wise inverses.