• 대한원격탐사학회지
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• 제27권6호
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• pp.717-728
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• 2011

An efficient method for the unsupervised classification of high resolution imagery is suggested in this paper. It employs pixel-linking and merging based on the adjacency graph. The proposed algorithm uses the neighbor lines of 8 directions to include information in spatial proximity. Two approaches are suggested to employ neighbor lines in the linking. One is to compute the dissimilarity measure for the pixel-linking using information from the best lines with the smallest non. The other is to select the best directions for the dissimilarity measure by comparing the non-homogeneity of each line in the same direction of two adjacent pixels. The resultant partition of pixel-linking is segmented and classified by the merging based on the regional and spectral adjacency graphs. This study performed extensive experiments using simulation data and a real high resolution data of IKONOS. The experimental results show that the new approach proposed in this study is quite effective to provide segments of high quality for object-based analysis and proper land-cover map for high resolution imagery of urban area.

• Journal of Microbiology and Biotechnology
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• 제17권6호
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• pp.1041-1044
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• 2007

To assess the effects of a proton beam on oyster mushrooms (Pleurotus ostreatus), the genetic diversity and phylogenetic relationships among strains induced by a proton beam were investigated based on a clustering analysis. According to an AFLP DNA polymorphism analysis, the induced strains were divided into four groups that coincided with the dose. When applying proton-beam radiation, the dissimilarity among the induced strains increased when increasing the dose. When using more than 400 Gy, the genetic dissimilarity of the irradiated strains was 46-58%. Thus, evaluating the induced strains using the AFLP technique was effective in revealing the mutation effect of the proton beam.

• 대한수학회논문집
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• 제25권1호
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• pp.149-160
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• 2010

Among the distance based algorithms in phylogenetic tree reconstruction, the neighbor-joining algorithm has been a widely used and effective method. We propose a new algorithm which counts the number of consistent quartets for cherry picking with tie breaking. We show that the success rate of the new algorithm is almost equal to that of neighbor-joining. This gives an explanation of the qualitative nature of neighbor-joining and that of dissimilarity maps from DNA sequence data. Moreover, the new algorithm always reconstructs correct trees from quartet consistent dissimilarity maps.

• 한국디지털건축인테리어학회논문집
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• 제7권1호
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• pp.29-34
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• 2007

Purpose of this paper is find the similarity and dissimilarity of Korean, Chinese and Japanese traditional furnitures for storage. Also this paper tries to have a comparative analysis on life style, characteristics of housing space and furniture's form of three countries. The study can be summarized as follows. First, space scale and seat levels of three countries are related to furniture's height and form, so that Chinese furniture have over scale than human, and Japanese furniture have the type of box for stacking. Second, the way of heating and materials of floors are concerned with the type of furniture's legs. Third, even if these dissimilarities, the aesthetic characteristics of three countries furniture would be a data base for making design identity of East Asian modern housing furniture.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.689-690
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• 2006

Relational discriminant analysis is a way of representing an object based on the dissimilarity measures among the prototypes extracted from feature vectors instead of the vectors themselves. Thus, by appropriately selecting a few number of representatives and by defining the dissimilarity measure, in this paper we propose a method of reducing the dimensionality and getting to achieve a better classification performance in both speed and accuracy. Our experimental results demonstrate that the proposed mechanism increases the performance as compared with the conventional approaches for samples involving artificial data sets.

• 한국산업정보학회논문지
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• 제8권4호
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• pp.38-45
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• 2003

메타 휴리스틱의 한 기법인 Ant System (AS) 알고리듬을 윤곽선 검출 문제에 적용하고 그 실험 결과를 보여준다. 윤곽선의 품질을 픽셀영역간 불일치 정도, 연속성, 두께 및 길이의 관점에서 규정지었다. 적합도 함수를 윤곽선 경로비용 최소화 문제로 전환하여 최적해를 탐색하였다. 예제 영상 실험결과 기존의 다른 기법에 비해, 영상의 질에 무관하게 상대적으로 신속하게 적은 메모리를 차지하는 즉, 최소량의 픽셀로 구성된 윤곽선을 검출할 수 있었다.

• Journal of Microbiology
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• 제45권6호
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• pp.566-571
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• 2007

Bacterial lipopolysaccharide (LPS) is a potent stimulator of bone resorption in periodontitis. Co-culture systems of mouse calvaria-derived osteoblasts and bone marrow-derived preosteoclasts were used as an in vitro osteoclast differentiation. This study revealed that co-cultures using ddY or ICR mouse strain responded differently to LPS while responded equally to $1{\alpha},25(OH)_2D_3$. Thus, the different response to LPS indicates dissimilarity of two mouse stains in their capacity for generating osteoclasts while the two mouse strains share the similarity in response to $1{\alpha},25(OH)_2D_3$. To identify which cells between osteoblasts and preosteoclasts in the co-culture are responsible for the dissimilarity, the reciprocal co-cultures were performed between ddY and ICR mouse strains. The treatment of $1,25(OH)_2D_3$ to ddY/ICR (osteoblasts from ddY/preosteoclasts from ICR) and ICR/ddY reciprocal co-cultures also showed the similarity. In case of LPS treatment, the results of ddY/ICR were similar to ddY/ddY and the results of the other reciprocal co-culture, ICR/ddY combination, were consistent with those of ICR/ICR. It suggests that the dissimilarity between the two mouse strains may resident in osteoblasts but not in preosteoclasts. Therefore, the osteoblast is responsible for mouse strain-dependent osteoclastogenesis in response to LPS. Although mouse models will continue to provide insights into molecular mechanisms of osteoclastogenesis, caution should be exercised when using different mouse strains, especially ddY and ICR strains as models for osteoclast differentiation.

• 한국산학기술학회논문지
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• 제13권11호
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• pp.5114-5123
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• 2012

본 연구는 카지노기업 종사원의 직무스트레스가 소진 및 조직몰입에 어떠한 영향을 미치는지 검증하고자 실시하였다. 먼저 직무스트레스가 소진에 미치는 영향을 분석한 결과, 직무스트레스 요인 중 이질성만이 정서적 탈진에 유의한 정(+)의 영향을 미치는 것으로 나타났으며 역할모호성과 역할갈등은 정서적 탈진에 유의한 영향을 미치지 않는 것으로 나타났다. 또한 역할모호성은 개인적 성취감 결여에 부(-)의 영향을 미치는 반면 역할갈등과 이질성은 개인적 성취감 결여에 정(+)의 영향을 미치는 것으로 나타났다. 역할모호성은 비인간화에 부(-)의 영향을 미치는 반면 역할갈등과 이질성은 비인간화에 정(+)의 영향을 미치는 것으로 나타났다. 다음으로 직무스트레스가 조직몰입에 미치는 영향을 분석한 결과, 역할모호성은 정서적 몰입에 정(+)의 영향을 미치는 반면, 역할갈등과 이질성은 정서적 몰입에 부(-)의 영향을 미치는 것으로 드러났다. 한편 유지적 몰입에는 유의한 영향을 미치지 않는 것으로 나타났다. 본 연구는 카지노기업의 경쟁력과 인적자원관리의 효율성을 제고하는데 기여할 수 있을 것이다.

• Environmental Engineering Research
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• 제12권2호
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• pp.37-45
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• 2007

Phytoremediation has been used effectively for the biodegradation of oil-based contaminants, including diesel, by the stimulation of soil microbes near plant roots (rhizosphere). However, the technique has rarely been assessed for itsinfluence on soil microbial properties such as population, community structure, and diversity. In this study, the removal efficiency and characteristics of rhizobacteria for phytoremediation of diesel-contaminated soils were assessed using barnyard grass (Echinochloa crusgalli). The concentration of spiked diesel for treatments was around $6000\;mg\;kg^{-1}$. Diesel removal efficiencies reached 100% in rhizosphere soils, 76% in planted bulk soils, and 62% in unplanted bulk soils after 3weeks stabilization and 2 months growth(control, no microbial activity: 32%). The highest populations of culturable soil bacteria ($5.89{\times}10^8$ per g soil) and culturable hydrocarbon-degraders($5.65{\times}10^6$ per g soil) were found in diesel-contaminated rhizosphere soil, also yielding the highest microbial dehydrogenase. This suggests that the populations of soil bacteria, including hydrocarbon-degraders, were significantly increased by a synergistic rhizosphere + diesel effect. The diesel treatment alone resulted in negative population growth. In addition, we investigated the bacterial community structures of each soil sample based on DGGE (Denaturing Gel Gradient Electrophoresis) band patterns. Bacterial community structure was most influenced by the presence of diesel contamination (76.92% dissimilarity to the control) and by a diesel + rhizosphere treatment (65.62% dissimilarity), and least influenced by the rhizosphere treatment alone (48.15% dissimilarity). Based on the number of distinct DGGE bands, the bacterial diversity decreased with diesel treatment, but kept constant in the rhizosphere treatment. The rhizosphere thus positively influenced bacterial population density in diesel-contaminated soil, resulting in high removal efficiency of diesel.

• 한국컴퓨터정보학회논문지
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• 제27권10호
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• pp.19-28
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• 2022

본 논문에서는 실시간 고성능 다중 객체 추적을 수행하기 위해 최적의 TBD (Tracking-by-detection) 메커니즘을 결정할 수 있는 Detector Scheduler를 제안한다. Detector Scheduler는 서로 다른 프레임 간의 특징량 차이를 측정하는 것으로 검출기 실행 여부를 결정하여 전체 추적 속도를 향상한다. 하지만, Detector Scheduler의 학습에 필요한 GT (Ground Truth) 생성이 어렵기 때문에 Detector Scheduler를 추적 결과만을 통해 학습 가능한 자가 학습 방법을 제안한다. 제안된 자가 학습 방법은 프레임 간의 객체 카디널리티와 객체 외형 특징량의 비유사도가 커질 때 검출기를 실행할 수 있도록 의사 레이블을 생성하고 제안된 손실함수를 통해 Detector Scheduler를 학습한다.