• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2006년도 추계 학술대회논문집
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• pp.61-65
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• 2006

This paper describes a recent development on the divergence free basis function based on a hermite stream function. The well-known cavity problem has been used to compare the accuracy and the convergence of the present method with those of a modified residual method known as one of the stabilized finite element methods. The comparison showed the present method performs better in the accuracy and convergence.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
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• pp.411-414
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• 2006

This paper describes a recent development on the divergence free basis function based on a hermite stream function. The well-known cavity problem has been used to compare the accuracy and the convergence of the present method with those of a modified residual method known as one of the stabilized finite e1ement methods. The comparison showed the present method performs better in the accuracy and convergence.

• Kyungpook Mathematical Journal
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• 제53권3호
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• pp.319-332
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• 2013

The sequence space $m(M,{\phi})^F$ of fuzzy real numbers is introduced. Some properties of this sequence space like solidness, symmetricity, convergence-free etc. are studied. We obtain some inclusion relations involving this sequence space.

• 충청수학회지
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• 제27권1호
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• pp.133-143
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• 2014

A new three-step quadraparametric family of eighth-order iterative methods free from second derivatives are proposed in this paper to find a simple root of a nonlinear equation. Convergence analysis as well as numerical experiments confirms the eighth-order convergence and asymptotic error constants.

• 한국통신학회논문지
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• 제18권6호
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• pp.815-823
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• 1993

본 논문에서는 곱셈연산이 필요치 안은 변형 비적 적응필터(MMADF : Modified Multiplication-free adaptive Filter) 알고리즘을 제안하고 수렴특성을 해석하였다. 제안한 구조는 DPCM(Differential Pulse Code Modulation)과 Sign 알고리듬을 이용한 MADF 구조에서 1차 필터를 첨가한 구조이다. 해석방법은 계수 비정렬벡터와 그 자기상관행렬의 수렴을 유도하였다. 수렴특성을 평가하기 위하여 분할등기(FSE : Fractionally Spaced Equallizer)에 적용하였으며, Sign 알고리듬, MADF 알고리듬, MMADF 알고리듬을 사용하여 정상상태오차와 수렴속도로 특성을 비교평가 하였다. MMADF 알고리듬을 FSE에 적용한 결과 안정된 수렴특성을 나타내었으며, 동일한 정상상태오차를 갖는 조건에서 시뮬레이션한 결과 기존의 Sign 및 MADF 알고리듬에 비해 신호특성 및 수렴속도가 개선 되었다.

• Journal of Microbiology and Biotechnology
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• 제31권7호
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• pp.999-1010
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• 2021

Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the environment. They are highly toxigenic and carcinogenic. Probiotic bacteria isolated from fermented foods were tested to check their ability to degrade and/or detoxify PAHs. Five probiotic bacteria with distinct morphologies were isolated from a mixture of 26 fermented foods co-cultured with benzo(a)pyrene (BaP) containing Bushnell Haas minimal broth. Among them, B. velezensis (PMC10) significantly reduced the abundance of BaP in the broth. PMC10 completely degraded BaP presented at a lower concentration in broth culture. B. velezensis also showed a clear zone of degradation on a BaP-coated Bushnell Haas agar plate. Gene expression profiling showed significant increases of PAH ring-hydroxylating dioxygenases and 4-hydroxybenzoate 3-monooxygenase genes in B. velezensis in response to BaP treatment. In addtion, both live and heat-killed B. velezensis removed BaP and naphthalene (Nap) from phosphate buffer solution. Live B. velezensis did not show any cytotoxicity to macrophage or human dermal fibroblast cells. Live-cell and cell-free supernatant of B. velezensis showed potential anti-inflammatory effects. Cell-free supernatant and extract of B. velezensis also showed free radical scavenging effects. These results highlight the prospective ability of B. velezensis to biodegrade and remove toxic PAHs from the human body and suggest that the biodegradation of BaP might be regulated by ring-hydroxylating dioxygenase-initiated metabolic pathway.

• 한국융합학회논문지
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• 제10권8호
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• pp.265-276
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• 2019

본 연구는 시각장애인 당사자관점에 기초한 베리어프리 전시감상공간 조성을 위한 사례연구이다. 연구참여자는 유의표집으로 중증시각장애인 4사례를 선정하여 심층인터뷰한 후 Yin의 사례분석방법을 활용하여 분석을 실시하였다. 분석결과 전시실 내부 접근성(3개 주제)과 몰입 가능한 전시 요구(6개 주제)에서 총 9개의 주제가 도출되었다. 연구결과를 바탕으로 다음과 같은 실천적 정책적 학문적 제언을 한다. 첫째, 시각장애인이 감상에 몰입할 수 있는 작품에 대한 정보의 질을 확보하여 제공할 필요가 있다. 둘째, 시각장애인의 문화향유권 증진을 위해 베리어프리 생활인증제가 문화예술영역에 적용될 수 있도록 정책개편을 위한 노력이 필요하다. 실천적 정책적 과제를 실현하기 위해 과학기술 인문사회 문화예술 융합연구가 활성화 되어야 할 것이다.

• Journal of information and communication convergence engineering
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• 제19권4호
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• pp.205-213
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• 2021

The properties of a scale-free network are little known; its node degree following a power-law distribution is among its few known properties. By selecting real-field scale-free networks from a network dataset and comparing them to other networks, such as random and non-scale-free networks, the topology characteristics of scale-free networks are identified. The assortative coefficient is identified as a key metric of a scale-free network. It is also identified that most scale-free networks have negative assortative coefficients. Traditional generation models of scale-free networks are evaluated based on the identified topology characteristics. Most representative models, such as BA and Holme&Kim, are not effective in generating real-field scale-free networks. A link-rewiring method is suggested that can control the assortative coefficient while preserving the node degree sequence. Our analysis reveals that it is possible to effectively reproduce the assortative coefficients of real-field scale-free networks through link-rewiring.

• 한국소음진동공학회논문집
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• 제18권6호
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• pp.674-680
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• 2008

A new meshless method for obtaining natural frequencies of arbitrarily shaped plates with the free boundary condition is introduced in the paper. In order to improve the characteristics of convergence and accuracy of the method, a special local polar coordinates system is devised and located for each of nodes distributed along the boundary of the plate of interest. In addition, a new way of decreasing the size of the system matrix that gives natural frequencies of the plate is employed to reduce the amount of numerical calculations, which is needed for computing the determinant of the system matrix. Finally the excellence of the characteristics of convergence and accuracy of the method is shown in several case studies, which indicate that natural frequencies by the proposed method are very accurate and converged swiftly to exact values as the number of boundary nodes increases.

• 융합신호처리학회논문지
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• 제11권3호
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• pp.226-231
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• 2010

본 논문에서는 희소 패리티 검사 행열로부터 생성된 생성행열을 사용하여 에러 정정능력과 높은 부호율을 갖는 DC-free 다중 모드 부호를 구성하기 위한 새로운 부호화 기법을 제안 한다. 제안된 기법은 별개의 후보 부호워드들을 생성하기 위해 고속 생성행열들을 이용한다. 복호 과정의 복잡도는 수신된 부호워드의 신드롬이 ‘0’인지 아닌지에 따라 결정된다. 만약 신드롬이 ‘0’ 인 경우 복호는 수신된 부호워드의 잉여 비트들을 삭제하여 간단히 수행되고, ‘1’인 경우에는 합곱 (sum-product) 알고리즘으로 복호가 이루어진다. 제안된 기법은 DC 성분을 억압하면서도 낮은 비트 오율을 가질 수 있다.