MPEG 비디오 검색을 위한 통계적 framework

유영달,강대성 동아대학교 정보기술연구소 2000 情報通信硏究所論文誌 Vol.8 No.1

Recently many informations are transmitted and stored as video data, and they are on the rapid increase because of popularization of high performance computer and internet. In this paper, to retrieve video data, shots are found through analysis of video stream and the method of detection of key frame is studied. Finally users can retrieve the video efficiently. This paper suggests a new feature that is robust to object movement in a shot and is not sensitive to change of color in boundary detection of shots, and proposes the characterizing value that reflects the characteristic of kind of video (movie, drama, news, music video etc.). The key frames are pulled out from many frames by using the local minima and maxima of differential of the value. After original frame(not dc image) are reconstructed for key frame, indexing process is performed through computing parameters. Key frames that are similar to user's query image are retrieved through computing parameters. It is proved that the proposed methods are better than conventional method from experiments. The retrieval accuracy rate is so high in experiments.

세균액 및 세균단백질 추출물이 배양 세포에 미치는 영향

유영대,임미경 대한치과보존학회 2000 Restorative Dentistry & Endodontics Vol.25 No.4

Dental pulp infection is most commonly caused by extensive dental caries, and some bacterial species invade root canals; bacterial components and products are thought to be associated with the pathogenesis of periapical periodontitis. A principle driving force behind pulpal disease response appears to lie in the host immune system's to bacteria and their products. We examined the production of interleukin 1β (IL-1β) and tumor necrosis factor α(TNF-α) from human peripheral mononuclear cells, lymphocytes and monocytes stimulated by heat-killed Acitnobacillus actinomycetemcomitans (ATCC 29523), Porphyromonas gingivalis (ATCC 33277) and Prevotella intermedia (ATCC 25611), and also by their sonicated bacterial extracts(SBE), respectively. The effects of three strains of heat-killed bacteria and their SBEs on the morphology of cultured blood cell lines HL-60 (KCLB 10240) and J774A.1 (KCLB 40067) were observed under the inverted microscope. Ultrastructural changes of J774A.1 exposed to heat- killed P. intermedia and its SBE were investigated using transmission electron microscopy. Production of IL-1β was reduced in human peripheral mononuclear cells after stimulation by sonic bacterial extracts of A. actinomycetemcomitans, P. gingivalis, and P. intermedia. Heat- killed and Sonic extract of P. gingivalis inhibited the production of TNF-α in peripheral mononuclear cells. Production of TNF-α was inhibited in peripheral monocytes after stimulation by sonic extracts of A. actinomycetemcomitans, P. gingivalis, and P. intermedia. HL-60 and J 774A.1 cells showed granular degeneration after treatment with heat- killed and sonic extracts of A. actinomycetemcomitans, P. gingivalis, and P. intermedia Chromatin margination and shrinkage were observed in 774A.1 treated with heat-killed P. intermedia. Cell wall structure and organelles were destroyed and vacuoles were formed in cytoplasm in J774A.1 treated with P. intermedia sonic extract. These results suggest that A. actinomycetemcomitans, P. gingivalis and P. intermedia may have an important role in the formation and progression of pulpal diseases via both modulation of production of IL-1β and TNF-α from blood mononuclear cells and cytopathic effects.

딸기 비가림 포트 육묘 시 자묘의 유인 위치가 생육에 미치는 영향

김대영,김승유,이희수,이선이 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.2

This research was conducted to examine the effects on the growth in response to position of daughter plant of strawberry (Fragaria×ananassa)‘Seolhyang’ during the pot nursery in rain shelter. Mixture of soil mother material medium and rice hull(1:1, volume/volume) and commercial medium were used for nursery medium. Uniform daughter plants of about 2.5 expanded leaves were placed on the center and the side of pot and were investigated the growth characteristics of daughter plants after 60 days. As a result, daughter plants on the side of pot showed a tendency to increase total fresh weight, number of primary root, root weight, and crown diameter which is important characteristics of plantlet quality. Number of primary root, root weight, and crown diameter of daughter plants on the side of pot compared to those on the center of pot were increased to 3% and 11%, 7% and 41%, and 5%, respectively. As a result of analysis of root zone using the root analysis system, the total root length, root surface area and root volume of daughter plants on the side of pot compared to those on the center of pot were increased significantly. Those differences were greater in the commercial medium compared to the mixture of soil mother material medium and rice hull(1:1, volume/volume). Thus, it is expected to be improved the plantlet quality of daughter plants and increase the production ratio of high-quality plantlet when daughter plants were placed on the side of pot during the pot nursery in rain shelter.

칼라영상 압축을 위한 LEBLD을 적용한 고속벡터 양자화기 설계

유영달,강대성 東亞大學校 附設 情報通信硏究所 1999 情報通信硏究所論文誌 Vol.7 No.1

This study propess the algorithm which designs the fast and efficient codebook using PCA(Principal Component Analysis) and proposed LEBLD(Least Error Boundary Line Detection) for good compressing rate vector quantizer of color image. By applying PCA to VQ(Vector Quantization) codebooks design, the superior codebook is fast generated. We design the three separate codebooks for three color components Y, Cb and Cr to generate effective codebook by adjusting the number of node for each tristimulus values Y, Cb and Cr as the correlation among components.

강자성체에서 상전이의 수치적 모의실험

유대영,양해정,양회룡,정진,최승평,장차익 조선대학교 기초과학연구소 2001 自然科學硏究 Vol.24 No.-

It is difficult to explain the magnetic phase transition with classical physics in Curie temperature. We studied qualitatively with the well known Ising model in statistical mechanics. We simulated systems of finite size by Monte Carlo methods with Metropolis algorithm. Thus we could estimate the values of quantities such as the magnetization(m) per spin the specific heat(c) per spin the magnetic susceptibility(χ) per spin, and the mean energy per spin compare with the numerical values in infinitive size. The quantities of c, m, χ, e varied rapidly within 2.3∼2.4 temperature at J/k units. Those values show that the critical temperature can be within the range. The hysteresis loop was obtained with this model.

2019년도 2학기 신라대학교 재학생의 부산인식 설문조사 분석 : 인문사회계 학생을 대상으로

김대래, 신군재, 유영명, 장희정, 정쾌영 신라대학교 부산학연구센터 2016 부산연구 Vol.17 No.2

이 논문은 신라대학교에 재학 중인 학생들을 대상으로 부산에 대한 인식을 알아보기 위해 수행 한 설문지에 대한 분정확히 알아보기 위하여 분석에서는 부산출신자를 대상으로 하였다. 학생들과 부모의 출생연도와 연령 등에 관한 기초분석을 하고 부산의 자랑과 특성에 관한 인식을 분석 하였다. 아울러 학생들의 일석이다. 총 237부의 응답지를 받았는데 그 중에서 부산출생자 153명 을 대상으로 분석을 하였다. 부산에 관한 인식을 좀 더 상생활과 관련된 설문을 분석하였다. 분석에는 spss24를 이용하여 빈도분석과 기술통계분석 그리고 교차분석을 하였다.

ZnS_(1-x)Te_x 단결정 박막의 격자진동

최용대,남성운,유영문 목원대학교 자연과학연구소 2000 自然科學 硏究論文集 Vol.9 No.1

Hot-wall epitaxy에 의하여 GaAs (100) 기판 위에 성장된 ZnS_1-xTe_x(0<x<1) 단결정 박막의 특성이 Raman 산란을 이용하여 조사되었다. Raman 산란으로부터 측정된 장파장의 ZnTe-like의 longitudinal 광학 포논의 주파수는 성분비 x와 함께 선형으로 변하였다. ZnS_1-xTe_x 단결정 박막의 x의 함수로서 zone-center 광학 포논의 주파수는 two-mode이었고, 이 결과는 MERI 모델의 이론치와 잘 일치하였다. ZnS_1-xTe_x(0<x<1) alloys grown on (100) GaAs substrates by hot-wall epitaxy are investigated using Raman scattering. The frequencies of long wavelength ZnTe-like and ZnTe-like longitudinal optical phonons determined from Raman scattering show linear variation with the composition x. The frequency of the zone-center optical phonons as a function of x of the ZnS_1-xTe_x mixed crystal shows a typical two-mode behavior. which is in good agreement with the theoretical results from a modified random-element isodisplacement model.

2017년 하반기 신라대학교 ‘부산의 하루’ 수강생 및 재학생 대상 설문조사의 분석(Ⅰ) : 종교, 부모의 고향 그리고 부산의 발전과 미래에 대한 인식을 중심으로

김대래, 장희정, 유영명, 박희정 신라대학교 부산학연구센터 2018 부산연구 Vol.16 No.1

As a result of analyzing the questionnaire about 212 people born in Busan, non-religion was the most with 61.8%, 20.3% Buddhism, 10.4% Protestant and 6.1% Catholic. These ratios were roughly similar to those of the past. However, the proportion of Buddhism was somewhat lower than that of the past, and the proportion of Catholicism was high. Fathers’ hometown was Busan (53.3%) and Gyeongnam (29.7%). Daegu and Gyeongbuk were 4.2% and 4.7% respectively. mothers's home is Busan's 51.4%, and Gyeongnam's 25%, so Busan and Gyeongnam has an overwhelming weight. There was a positive response to the questionnaire on the development and future of Busan. It was optimistic that the questionnaire on 'what will happen to the development of Busan in 10 years' would be much better. The answer of "Yes" was much superior to the question "The future of Busan is bright." Only 13.2% of respondents said “No” to the question. However, the percentage of respondents who answered "normal" was 39.2%. Overall, respondents were still brightly looking at the future of Busan, even though they knew there were not many jobs. The responses to the questionnaire about safety and environment in Busan were mixed. While the rate of feeling safe about terrorism was not high, the risk for nuclear power plants, earthquakes and typhoons was felt to be higher. On the other hand, there were many negative perceptions in the environmental survey. Negative responses predominated in all environmental questions. Respondents were not satisfied with the air, water and cleaning of Busan. Busan's administrative and political questionnaires had many negative responses. Although respondents who were the first grade in college may have difficulty in responding to the survey, many responded to the decision, but in general, there were more negative responses in the questionnaires on politicians, administration, and public officials. Busan's traffic-related questionnaire was positive. Transportation routes, fare, and transportation. The results of the questionnaire on Busan's culture and arts, and whether Busan is a good city to live in, were positive. Students did not think that Busan's culture and arts level was low, and Busan was perceived as a beautiful and livable city. The recognition of students at Silla University is noteworthy because it is contrary to the general belief that Busan is a barren and not a good place for culture and arts. 부산출생자 212명에 대하여 설문조사를 분석한 결과 종교는 무교가 61.8%로 대부분을 점하는 가운데 불교 20.3%, 개신교 10.4%, 가톨릭 6.1%였다. 이러한 비율은 과거의 조사와 대체로 비슷하였다. 다만 불교의 비중이 과거의 조사에 비해 다소 낮았고 가톨릭의 비중은 높았다. 아빠의 고향은 부산이 53.3%, 경남이 29.7%로 압도적으로 부산/경남이 점하고 있었다. 대구/경북은 4.2%, 호남/제주는 4.7%였다. 엄마의 고향은 부산이 51.4%, 경남이 25%로 역시 부산/경남이 압도적인 비중을 점하고 있다. 부산의 발전과 미래에 대한 설문은 긍정적인 응답이 많았다. ‘10년후 부산의 발전이 어떻게 될 것인가’에 대한 설문에는 대부분 더 나아질 것이라고 응답을 하여 낙관적인 전망을 보였다. ‘부산의 미래는 밝은가’라는 설문에 대해서도 ‘그렇다’는 응답이 훨씬 우세하였다. ‘그렇지않다’는 응답은 13.2%에 불과하였다. 다만 ‘보통이다’는 응답비율이 39.2%로 상당히 높았다. 종합적으로 볼 때 응답자들은 일자리가 많이 없다는 것을 알고있음에도 불구하고 부산의 미래를 아직은 밝게 보고 있었다. 부산의 안전과 환경에 대한 설문 응답은 엇갈린 응답이 나왔다. 테러에 대해서는 안전하다고 느끼는 비율이 높았던 반면, 원전과 지진 그리고 태풍에 대해서는 그로 인한 위험을 더 크게 느끼는 것으로 나타났다. 한편 환경과 관련된 설문에서는 부정적인 인식이 많았다. 환경 관련 모든 문항에서 부정적인 응답이 우세하였다. 응답자들은 부산의 공기, 물, 청소 등이 좋지 않다고 판단 하고 있었다. 부산의 행정과 정치에 관한 설문은 부정적인 응답이 많았다. 대학 1학년이 주축인 응답자들에게는 다소 어려운 설문들일 수도 있어 판단을 유보한 응답이 많았지만 대체로 정치인과 행정 그리고 공무원 등에 관한 설문에서 모두 부정적인 응답이 더 많았다. 부산의 교통관련 설문은 긍정적이었다. 교통노선, 요금 그리고 교통수단간의 연계 등은 잘 되어 있는 것으로 인식하였다. 부산의 문화와 예술 그리고 부산이 살기좋은 도시인가 등에 관한 설문결과는 긍정적인 응답이 우세하였다. 학생들은 부산의 문화예술 수준이 낮다고 생각하지 않았으며 부산이 아름답고 살기좋은 도시로 인식하고 있었다. 이러한 신라대학교 재학생들의 인식은 일반적으로 부산이 문화예술의 불모지이고 아름답지 않다는 통념과는 반대되는 것이어서 주목된다. 이에 관해서는 좀 더 장기적으로 그리고 타대학 학생들의 설문과 비교하면서 그 의미를 이해해 보아야 할 것이다.

ATM망에서 위반 셀을 이용한 트래픽제어에 관한 연구

김대영,김장형,이유경 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.1

In this paper, we proposed priority scheduling and buffer assignment algorithm using two finite buffers and multiple threshold values as a priority cell scheduling mechanism to serve efficiently multimedia traffic in ATM networks. Multimedia traffics can be categorized into four classes based on their real time properties and loss tolerance. we analysed priority control mechanisms to achieve the cell loss rate requirements and the delay requirements of each service class using an ATM switch with output buffer. Basic concept of proposed priority control scheme is flexible to serve the four classes service using double buffers in ATM Adaptation Layer( AAL) The service classes of our concern are satisfied with the CBR(Constant Bit Rate) class and VBR(Variable Bit Rate) class. The CBR is applied to Push Out cell loss priority method and the VBR is applied PBS to method with two thresholds. The performance of the proposed method is to firstly discard the tagged cell from the UPC parameter using two threshold is better than the VBR with one threshold.

2019년 2학기 ‘부산의 하루’ 수강생의 부산인식 설문조사 분석

김대래, 유영명, 정용석 신라대학교 부산학연구센터 2019 부산연구 Vol.17 No.2

이 논문은 2019년도 2학기 신라대학교에 재학 중인 학생들을 대상으로 부산에 대한 인식을 알 아보기 위해 수행한 설문지에 대한 분석이다. 총 115부의 응답지를 받았지만 부산출생자 69명을 대상으로 분석을 하였다. 이 조사는 매년 2학기에 이루어지고 그 분석결과는 부산연구에 게재되고 있다. 이와 같은 연구는 오랜 기간에 걸쳐 누적될 때 그 의미가 더 커지리라고 생각된다.