• Ocean Systems Engineering
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• 제6권3호
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• pp.217-231
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• 2016

This paper presents a new approach for underwater image analysis using the bi-dimensional empirical mode decomposition (BEMD) technique and the phase congruency information. The BEMD algorithm, fully unsupervised, it is mainly applied to texture extraction and image filtering, which are widely recognized as a difficult and challenging machine vision problem. The phase information is the very stability feature of image. Recent developments in analysis methods on the phase congruency information have received large attention by the image researchers. In this paper, the proposed method is called the EP model that inherits the advantages of the first two algorithms, so this model is suitable for processing underwater image. Moreover, the receiver operating characteristic (ROC) curve is presented in this paper to solve the problem that the threshold is greatly affected by personal experience when underwater image edge detection is performed using the EP model. The EP images are computed using combinations of the Canny detector parameters, and the binaryzation image results are generated accordingly. The ideal EP edge feature extractive maps are estimated using correspondence threshold which is optimized by ROC analysis. The experimental results show that the proposed algorithm is able to avoid the operation error caused by manual setting of the detection threshold, and to adaptively set the image feature detection threshold. The proposed method has been proved to be accuracy and effectiveness by the underwater image processing examples.

• 가족자원경영과 정책
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• 제18권3호
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• pp.61-77
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• 2014

Purpose of this study is to draw policy implications for family resource management's strategies and leisure culture revitalization to Korean baby-boomers. This study review leisure activities characteristics of Korean baby-boomers and find their characteristics' impact on leisure economy. This research analyzed with raw data of "National Research Leisure Activities 2012" in different methods: analysis of frequency, multiple regression analysis, Correspondence Analysis, and etc. As a result, compared to all age groups in Korea, Korean baby-boomers current participation in leisure activities is low, but their expense on leisure is high. Their leisure activities are varied from different genders to their incomes. Especially, baby-boomers, who are on high income, participate in wasteful leisure activities and their consuming behavior will be the mainstream of Korean leisure economy, so economy, which is aiming for baby-boomers, will be invigorated when the economy is more concerned with use values toward time. Particularly, preparing for the retirement of baby-boomers, further researches based on integrated family policy should be considered plans and efforts on encouraging active volunteer works and participation in leisure culture revitalization of Korean baby-boomers.

• Journal of Preventive Medicine and Public Health
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• 제41권1호
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• pp.1-9
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• 2008

Objectives : This study evaluated knowledge structure and its effect factor by analysis of co-author and keyword networks in Korea's preventive medicine sector. Methods : The data was extracted from 873 papers listed in the Journal of Preventive Medicine and Public Health, and was transformed into a co-author and keyword matrix where the existence of a 'link' was judged by impact factors calculated by the weight value of the role and rate of author participation. Research achievement was dependent upon the author's status and networking index, as analyzed by neighborhood degree, multidimensional scaling, correspondence analysis, and multiple regression. Results : Co-author networks developed as randomness network in the center of a few high-productivity researchers. In particular, closeness centrality was more developed than degree centrality. Also, power law distribution was discovered in impact factor and research productivity by college affiliation. In multiple regression, the effect of the author's role was significant in both the impact factor calculated by the participatory rate and the number of listed articles. However, the number of listed articles varied by sex. Conclusions : This study shows that the small world phenomenon exists in co-author and keyword networks in a journal, as in citation networks. However, the differentiation of knowledge structure in the field of preventive medicine was relatively restricted by specialization.

• The International Journal of Costume Culture
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• 제5권1호
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• pp.58-66
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• 2002

The objectives of this study are to develope sensibility image scales for Korean traditional motifs by quantitatively measuring their images and preference and to classify them into clusters. Data were collected via a questionnaire from seven hundred twenty five Korean undergraduate students. Re experimental materials were forty eight stimuli of Korean traditional motifs with different categories, interpretation types, composition types, and application objects. The instruments consisted of 7-point polar semantic differential scales of twenty three bipolar adjectives including preference. Data were analyzed by correspondence analysis, cluster analysis, ANOVA and Duncan's multiple range test. Re major results are as follows; image scales for textile patterns and dress designs using Korean traditional motifs were constructed. The axes of sensibility image scales for both textile patterns and dress designs were defined by quality level and degree of simplicity. Second, four clusters on the scale of textile patterns and two clusters on the scale dress designs were identified. Third, in the case of textile Patterns, the preferred cluster had high-quality and classical images, while the cluster that was not preferred had a complex image. In the case of dress designs, the preferred cluster had simple and high-quality images, while the cluster that was not preferred had complex and low-quality images.

• 한국해양공학회지
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• 제27권2호
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• pp.27-32
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• 2013

A valve is a marine structure that is subjected to multiple seawater loads. Therefore, it is necessary to define the kind of loads applied to it to confirm whether the structure has sufficient strength. In this research, we aimed to find the optimal solution for the stress and deformation of valves under various loads. We first selected design variables and implement a finite element analysis according to changes in the thickness of each component of a valve based on a central composite design. Next we developed a regression model of the response surface. Using this model, we calculated the optimal objective value based on NSGA-II. Finally, to confirm the correspondence between the optimal objective value and the real FEM value, we compared the optimal result and structural analysis result to verify the performance of NSGA-II.

• Journal of Forest and Environmental Science
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• 제35권3호
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• pp.189-196
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• 2019

Plants are consumed by a myriad of organisms that compete for resources. Direct interactions among multiple plant-feeding organisms in a single host can range for each species from positive to negative. Wood-boring beetle faces a number of biotic and abiotic constraints that interfere with the good prospects from the tree. Biotic factors, including arthropod pests and diseases, and abiotic factors, such as drought and water-logging, are the major constraints affecting the species. The present study aimed to provide basic data for analyzing forest health, identify the kinds of wood-boring beetles in the central part of Korea. Our second goal was to analyze the species composition and diversity of regional communities and to examine. A total of 10,461 individual wood-boring beetles belonging to 8 families and 50 species attracted to trap trees in the pine forests were recorded during the study period on study sites. The results of the analysis of collected species showed that the community structure on all study sites was similar. Seasonal occurrences of dominant wood-boring beetles (5 species) from each study site showed the highest number of all species, except for Siphalinus gigas in May, followed by a gradual decline, and the largest number of Siphalinus gigas appeared in June. The similarity index of species composition was relatively high, ranging from 0.75 to 0.90 for each study site.

• 기술혁신학회지
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• 제18권3호
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• pp.387-415
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• 2015

본 연구에서는 표준통계분류체계 간 연계를 통해 산업 혹은 제품의 내수 시장규모를 추정하는 방법을 제안하고 실질적 활용 가능성을 타진하였다. 이를 위해 KSIC 분류로 조사된 통계청의 광업 제조업 조사 결과와 HS 분류로 조사된 무역데이터를 통계청과 UN 통계처에서 제공하는 연계표를 활용하여 연계하였다. KSIC-ISIC-HS 간 통합연계표를 이용하여 국내시장규모를 분석하는데 있어 가장 큰 문제는 분류체계 간 중복 연결 문제인데, 본 연구에서는 각 품목별 출하액과 무역액 사이에 강한 상관관계가 있음을 활용하여 출하액의 상대적인 비중을 가중치로 중복 연결된 HS 무역액을 배분하는 방법을 제시하였다. 이를 이용하면 제조업 분야의 총 125개 모든 ISIC 품목별 국내시장규모를 분석하고 이를 바탕으로 미래의 단기 시장 규모를 예측할 수 있다. 본 연구에서 제시한 방법은 ISIC 분류보다 세분화 된 품목에 대한 분석의 한계, 제조업 이외의 분야에 대한 적용 한계, 출하액 결측치로 인한 오차 등의 한계가 있으나, 내수 시장규모 정보를 가장 객관적이고 신뢰성 있으며 지속적으로 활용 가능한 데이터를 이용하여 분석 제공할 수 있는 방법을 제시한 점에 본 연구의 의의가 있다.

• 마케팅과학연구
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• 제16권3호
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• pp.125-142
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• 2006

본 연구는 경제적 부가가치를 높일 수 있는 관광자원 중에서 두드러지는 자원중의 하나인 지역축제에 관한 연구이다. 지역축제들이 적극적 이벤트로 잘 포장되어 개발될 때 관광객들이 그 지역주민과 커뮤니케이션을 공유하게 되며, 결국에는 문화적 체험을 할 수 있는 고부가가치 관광자원이 될 수 있다. 지역을 대표할 수 있는 축제인 부여 백제문화제는 제 51 회 대회가 2005 년 10월 3 일 ${\sim}$10월 5 일(3일간)간 지속적으로 개최되고 있는 커다란 지역문화제라고 할 수 있다. 전국 3 대 문화제중 하나인 백제문화제는 지역단위 행사가 아닌 전 국민이 함께 느끼고 즐기며 배울 수 있는 전국 최고의 전통문화축제를 지향하고 있다. 본 연구에서는 부여 백제문화제 방문객들에 대한 주요 선택속성 요인들을 찾아내고, 밝혀낸 선택속성 요인을 근거로 대응일치분석을 통하여 인구통계학적 특성에 따른 선호도를 살펴보고 이에 따른 방문객 유치증대에 기여하고자 한다 또한, 축제 선택속성 요인이 재방문 의사에 어떠한 영향을 미치는지를 밝혀내고, 우리나라의 대표적인 지역문화축제라고 할 수 있는 부여 백제문화제의 문제점 및 장 단점을 분석하여 향후 지역축제 개최시 보다 많은 관광객유치와 관광수입을 올릴 수 있는 개선방안을 강구하고자 한다.

• 응용통계연구
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• 제19권2호
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• pp.331-338
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• 2006

수량화 제3방법은 일본의 하야시(Hayashi)에 의해 창안된 교차표 분석 기법으로 사회조사 및 마케팅 조사 자료의 분석에서 매우 유용하다. 그러나 반응빈도가 작은 일부 범주들이 특이하게 큰 수량화 값을 갖는 경우가 있어 불안정한 과잉 해석으로 이어지기도 한다. 본 교신은 이 문제를 해결하고자 한 연구로서 수량화 제3방법을 새로 정식화하고 축소 해 (shrinkage solution)를 제안할 것이다. 그리고 실제 조사 자료에 새 방법론을 적용해 보고자 한다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.116-119
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• 2005

As to the synthetical estimation of land covering parameters or the compounded land covering classification for multi-resolution satellite data, former researches mainly adopted linear or nonlinear regression models to describe the regression relationship of land covering parameters caused by the degradation of spatial resolution, in order to improve the retrieval accuracy of global land covering parameters based on 1;he lower resolution satellite data. However, these methods can't authentically represent the complementary characteristics of spatial resolutions among different satellite data at arithmetic level. To resolve the problem above, a new compounded land covering classification method at arithmetic level for multi-resolution satellite data is proposed in this .paper. Firstly, on the basis of unsupervised clustering analysis of the higher resolution satellite data, the likelihood distribution scatterplot of each cover type is obtained according to multiple-to-single spatial correspondence between the higher and lower resolution satellite data in some local test regions, then Parzen window approach is adopted to derive the real likelihood functions from the scatterplots, and finally the likelihood functions are extended from the local test regions to the full covering area of the lower resolution satellite data and the global covering area of the lower resolution satellite is classified under the maximum likelihood rule. Some experimental results indicate that this proposed compounded method can improve the classification accuracy of large-scale lower resolution satellite data with the support of some local-area higher resolution satellite data.