• Journal of the Korean Institute of Intelligent Systems
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• v.11 no.1
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• pp.70-75
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• 2001

종의 분화는 생명체의 다양성을 유지하며, 좀더 환경에 적합한 생명체를 탄생시킨다. 그래서, 자연계의 진화에 모방을 둔 진화 알고리즘은 주어진 환경에 적응하기 위해 다양성을 유지해야 한다. 본 논문에서는 이러한 종의 분화 개념을 도입한다. 개체군의 각 개체들이 돌연변이를 통하여 자손을 생성하고, 그 중 일부가 분화하여 다음 세대의 개체를 이룬다. 각 개체들은 돌연변이에 의해 결정되는 일정한 해밍 공간 내외를 탐색공간으로 하고, 분화를 통하여 유효한 탐색공간을 점차 넓혀 탐색공간 전체에 대한 효율적인 탐색을 수행한다. 돌연변이를 통한 진환 방법으로 진화 하드웨어에 적용할 경우 내부구조의 변경이 적어 빠른 탐색효과를 가질 수 있다. 제안된 알고리즘을 2개의 최적화 문제에 적용하여 그 유용성을 확인한다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.252-253
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• 2000

어류에서 정자의 형태 및 구조에 관한 연구는 진화 유연관계 추적을 위해 그들의 변이성을 토대로 행해지고 있다. 어류 정자의 형태 및 미세구조는 종간 또는 그들의 생식생태와 관련하여 그 변이가 아주 다양하다. 일반적으로 어류의 정자는 수정 장소에 따라 체외수정형(aquasperm type)과 체내수정형(introsperm type)으로 나뉘고, 이는 다시 첨체의 유무에 따라 첨체형(acrosomal type)과 무첨체형(anacrosomal type)으로 나누어진다(Jamieson, 1991). (중략)

• Proceedings of the KSLP Conference
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• 1993.12a
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• pp.15-15
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• 1993

정상 성대는 규칙척인 진동을 보이지만 병변이 있는 사람들은 진폭과 시간에 있어서 주기마다의 불규칙성을 보여준다. 이 때 각 주기마다의 시간의 불규칙성은 Jitter를 의미하며 강도의 불규칙성은 Shimmer로 표현된다. 본 연구는 우리나라 정상인 음성의 떨림을 객관적으로 조사해보고 이에 따라 병변이 있는 사람들의 음성의 떨림을 판별할 수 있는 가능성을 알아보기 위하여 저자들은 CSpeech를 이용해 정상인과 후두폴립환자의 jitter, shimmer, S R를 비교해보았다.(중략)

• Journal of the Korean Chemical Society
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• v.63 no.6
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• pp.427-434
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• 2019

The role of hydrophobic residues on protein folding reaction was studied by folding kinetics measurements in conjunction with protein engineering. The HubWA, which was derived from human ubiquitin by mutating the residues at 45 (Phe to Trp) and 26 (Val to Ala), was used as a mutational background. Fourteen hydrophobic residues were mutated to alanine. Among fourteen variants generated, only four variant proteins (V5A, I13A, V17A, and I36A) were suitable for folding study. The folding kinetics of these variants was measured by stopped-flow fluorescence spectroscopy. The folding kinetics of HubWA and V17A was observed to follow a three-state on-pathway mechanism. On the other hand, folding kinetics of V5A, I13A, and I36A was observed to follow a two-state mechanism. Based on these observations, transition of protein folding reaction from collision-diffusion mechanism to nucleation-condensation mechanism was discussed.

• Journal of Broadcast Engineering
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• v.9 no.3
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• pp.196-206
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• 2004

This paper presents an efficient joint disparity-motion estimation algorithm for stereo sequence CODEC. Disparity vectors are estimated by the left and right motion vectors and previous disparity vectors for every frame. In order to obtain more accurate disparity vectors. we include a spatial prediction Process after the feint estimation. From joint estimation and spatial prediction, we can obtain accurate disparity vectors and then Increase coding efficiency. Finally, we proposed the backward quadtree decomposition. which helps the encoder to have a more detailed disparity vector map without transmitting additional coding bits for quadtree information. We confirmed superior performance of the proposed method through computer simulation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.4C
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• pp.424-432
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• 2003

In this paper, an effective method of stereo image reconstruction through the regularized adaptive disparity estimation is proposed. Althougth the conventional adaptive disparity estimation method can sharply improve the PSNR of a reconstructed stereo image, but some problems of overlapping between the matching windows and disallocation of the matching windows can be occurred, because the matching window size changes adaptively in accordance with the magnitude of feature values. Accordingly, in thia paper, a new regularized adaptive disparity estimation technique is proposed. That is, by regularizing the estimated disparity vector with the neughboring disparity vectors, problems of the conventional adaptive disparity estimated scheme might be solved, and also the predicted stereo image can be more effectively reconstructed. From some experiments using the CCETT'S stereo image pairs of 'Man' and 'Claude', it is analyzed that the proposed disparity estimation scheme can improve PSNRs of the reconstructed images to 10.89dB, 6.13dB for 'Man' and 1.41dB, 0.81dB for 'Claude' by comparing with those of the conventional pixel-based and adaptive estimation method, respectively.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.19 no.2
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• pp.127-135
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• 1986

Each molecular weight (Mw) fraction of melanoidins prepared from a D-glucose and glycine system, i. e., Mw below 1,000, Mw between 1,000 to 5,000 and Mw above 5,000 and nondialyzable and ozone-treated melanoidins were reacted with heat-induced mutagens such as Trp-P-1, Trp-P-2, Glu-P-1, Glu-P-2 and IQ at $37^{\circ}C$ for 30 min. The inhibitory effects of the melanoidins on the mutagens increased with increasing molecular weight. The reducing ability ana antioxidative activity of melanoidins also increased in proportion to the increase in molecular weight, whereas the mutagenic inhibitory effect decreased on reduction of the melanoidins with sodium borohydride. It was also observed that a part of Trp-P-1 was adsorbed to melanoidin molecules. On modification of amino groups of these mutagens with carbonyl compounds derived through the Maillard reaction such as diacetyl and glyceraldehyde, their mutagenic activities were remarkably suppressed. Accordingly, it is speculated that the mutagenic inhibitory action of melanoidins is due to their reducing ability and antioxidative activity, and electrostatic binding and carbonyl groups of the melanoidin molecules.

• Journal of Mushroom
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• v.5 no.1
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• pp.34-38
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• 2007

The white-colored and the dark gray-colored mutants were frequently happened in cultivated areas of Pleurotus ostreatus (Wonhyeong-neutari). These caused conflicts between farmers and spawn companies. Our studies were conducted to elucidate the mechanism of mutagenesis. The results from the studies would provide valuable informations that could be used to prevent the color-related mutation, and also will be applied in breeding programs of P. ostreatus. Oyster mushroom variety, Wonhyeong-neutari, is somatic hybrid of Pleurotus and has genetic makers for arginine, ornithine, proline, riboflavine. Genetic markers analysis of monospore isolates derived from color mutants show identical tendency with that of Wonhyeong-neutari, these results indicate that color mutants were derived from Wonhyeongneutari. Twenty-one and four homokaryons were selected from the white-colored mutant MGL 2205 and gray-colored ASI 2029. All 34 F1 hybrids derived from the white-colored mutant MGL 2205 produce white-color fruiting bodies, indicating that the white color trait is heritable. In the first generation hybrids between the white-colored MGL 2205 and the gray-colored ASI 2029, all 16 hybrids produced pigmented fruiting bodies. Homokaryons isolated from the hybrid MGL 2205 X ASI 2029 were mated with homokaryon tester strains derived from MGL 2205. By these result, we could assumed that white color trait is a heritable character which is controlled by more than one recessive gene.

• Korean Journal of Food Science and Technology
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• v.27 no.6
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• pp.944-949
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• 1995

To investigate the effect of processing on the antimutagenicity of rice, antimutagenic effect of rice products including cooked rice, plain steamed rice bread(baikseolgi) and parched rice powder were observed. They showed inhibitory effects of $46%{\sim}100%$ on the frameshift mutation, whereas they showed little inhibitory effect on the base substitution mutation in the Salmonella typhimurium reversion assay. No inhibitory effect was found in the SOS chromotest. Inhibitory effect was more clearly observed on the indirect-acting mutagen than on the direct-acting mutagen. In case of the S. typhimurium reversion assay, the range of inhibition rate against the frameshift and base substitution mutation was $75%{\sim}100%$ and $66%{\sim}87%$, respectively, and was $19%{\sim}67%$ in the SOS chromotest. Antimutagenic activity of raw rice was supposed to be maintained in processed rice products.

• Korean Journal of Poultry Science
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• v.11 no.1
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• pp.27-32
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• 1984

In order to use the liquid whole eggs as an ingredients of retorted products, the provention of the green-grey discoloration of retorted liquid whole eggs by the addition of the Na$_2$EDTA was investigated. And palatability change of the retorted liquid whole eggs by the addition of Na$_2$EDTA was also investigated. The results obtained were summarized as follows: 1. More severe green-grey discoloration was occurred when higher cooking temperature and longer cooking time were used. 2. Green-grey discoloration of retorted liquid whole eggs could be prevented by the addition of about 0.015% of Na$_2$EDTA. 3. The palatability of retorted liquid whole eggs was not lowered by the addition of 0.02% of Na$_2$EDTA and green grey discoloration was not developed during the storage time of 22 days at room temperature.