• Journal of Broadcast Engineering
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• v.24 no.6
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• pp.1035-1052
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• 2019

Recently, as the demand for immersive videos increases, efficient video processing techniques for omnidirectional immersive video is actively developed by MPEG-I. While the omnidirectional video provides a larger degree of freedom for a free viewpoint, the size of the video increases significantly. Furthermore, in order to compress 6 degree-of-freedom (6 DoF) videos that support motion parallax, it is required to develop a codec to yield better coding efficiency. In this paper, we develop a 6 DoF codec using Versatile Video Coding (VVC) as the next generation video coding standard. To the authors' best knowledge, this is the first VVC-based 6 DoF video codec toward the future ISO/IEC 23090 Part 7 (Metadata for Immersive Media (Video)) MPEG-I standardization. The experiments were conducted on the seven test video sequences specified in Common Test Condition (CTC) in two operation modes of TMIV (Test Model for Immersive Media) software. It is demonstrated that the proposed codec improves coding performance around 33.8% BD-rate reduction in the MIV (Metadata for Immersive Video) mode and 30.2% BD-rate reduction in the MIV view mode as compared to the state-of-the-art TMIV reference software. We also show the performance comparisons using Immersive Video PSNR (IV-PSNR) and Mean Structural Similarity (MSSIM).

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.8 no.3
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• pp.383-387
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• 1998

The vacuum-Bridgman equipment for large size diameter (4 inch more over) crystal growth was organized simply and the $CaF_2$ single crystal which was grown in the conditions of growth rate of 2mm/hr, freezing temperature gradient of $12^{\circ}C$/cm, have analyzed to keep excellent properties. Using Mo thermal reflector of umbrella shape, it could be eliminated the formation of polycrystalline. The preferential growth direction was (111) and the calculated lattice parameter was $5.460 \AA$ by XRD peaks. The secondary phases, also, was not formed by means of powder-XRD analysis. The value of EPD is $1.4{\times}10^4 \textrm{cm}^{-2}$ and the optical quality, which is the transmittance is 91% up in UV region, is suitable for optical components of UV applications.

• Korean Journal of Environment and Ecology
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• v.32 no.6
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• pp.566-574
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• 2018

The purpose of this study was to identify the phylogenetic relationships of the plants in the Korean genus Suaeda and to find out the molecular markers that could confirm the interspecies relationships in the family tree through molecular phylogenetic studies. We used the nuclear ribosomal DNA ITS and the chloroplast DNA matK, psbA-trnH, and trnL-trnF as the molecular markers. We could not distinguish between S. japonica and S. maritima and between S. maritima and S. australis in the ITS region and could not distinguish between S. japonica and S. australis with the base sequence in the psbA-trnH and trnL-trnF region. However, we analyzed the combinations of four molecular marker regions and confirmed that each of five plant species of the genus Suaeda formed the independent line. Therefore, it is considered that combinations of molecular markers would be useful for the analysis of phylogenetic relationships in the genus Suaeda. Further investigations of the ecological and morphological characteristics would be needed to understand the phylogenetic relationship and lineage diversification in the genus Suaeda.

• Journal of Adhesion and Interface
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• v.10 no.2
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• pp.98-105
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• 2009

Poly(amic acid) was synthesized from the reaction of p-PDA/ODA and PMDA/BPDA and silane oligomer containing epoxy group was also synthesized from the reaction of tetramethylorthosilicate (TMOS) and glycidol. After hybridizing poly (amic acid) and silane oligomer, they were effectively converted into polyimide/silica hybrid films by thermal imidization process. As the silica contents in hybrid films increased, CTE values decreased from 17 ppm/K to 10 ppm/K and the tensile modulus increased, in spite of decreasing tensile strength. In addition, the peel test showed that the adhesion strength of hybrid film was enhanced from $0.43kg_f/cm$ to $1.02kg_f/cm$. Therefore, it could be concluded that the polyimide/silica hybrid film is effective to enhance adhesion strength for FCCL films.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.07a
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• pp.270-274
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• 2003

네트워크상태의 탄소나노튜브 나노선과 바나듐 옥사이드 나노선의 전압-전류 특성을 측정하고 옴성 전압전류특성과 함께 정류 다이오드 특성을 관측하였다 정류특성을 Schottky diode 관점에서 분석하였고 나노선을 이용한 다이오드의 이상지수가 10을 초과하는 큰 값을 가짐을 알았다. 2단자 전극상태에서 전류잡음 1/f 잡음형태가 관측되었다.

• Clinical and Experimental Pediatrics
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• v.50 no.2
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• pp.151-156
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• 2007

Purpose : Streptococcus pneumoniae is a major etiologic agent for pneumonia, meningitis, otitis media, and sepsis among young children. Multi-drug resistant strains have raised great concern worldwide, thus the importance of prevention with vaccines has been emphasized. However, vaccines may force the appearance of pneumococcal infections by nonvaccine serotypes. Thus, distribution of pneumococcal serotypes should be monitored to estimate vaccine efficacy. We used a new and efficient multibead assay in determining pnemococcal serotypes. Methods : From January to February 2005, 643 children were recruited from ten day care centers to isolate pneumococci from their oropharynx. Pneumococcal serotyping was performed on 62 pneumococcal isolates from 60 children by multibead assay. This immunoassay required two sets of latex particles coated with pneumococcal polysaccharides and serotype-specific antibodies. Twenty four newly developed monoclonal antibodies specific for common serotypes and a pool of polyclonal rabbit sera for some of the less common serotypes were used. Results : The most prevalent pneumococcal serotypes were serotype 6A, 19A, 19F, 23F, and 11A/D/F which accounted more than 50 precent of all the 62 pneumococcal isolates. We found that multibead assay can be performed very rapidly and objectively. Conclusion : This multibead immunoassay was very useful in serotyping clinical isolates of S. pneumoniae because it was simple, reliable and fast.

• Proceedings of the KIPE Conference
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• 2018.07a
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• pp.129-131
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• 2018

본 논문은 3레벨 태양광 PCS에서 누설전류의 분석 및 저감기법을 제안하였으며 시뮬레이션 및 실험을 통해 검증하였다. 태양전지 어레이의 기계적인 구조와 설치로 인해 태양광 모듈과 접지 간에 존재하는 기생 커패시터 성분을 고려하여 공통모드 전압관점의 등가모델을 통해 누설전류 발생 원인을 분석하였다. 100nF/kW 기준으로 1uF 기생 커패시터를 고려한 10kW급 3레벨 태양광 PCS 시뮬레이션 및 실험을 수행하였으며, 누설전류의 크기가 이상적인 SVPWM에서의 누설전류기준 27%로 감소하는 모습을 검증하였다.

• Analytical Science and Technology
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• v.29 no.3
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• pp.142-153
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• 2016

In crime scene investigation, fingerprint identification is regarded to be one of the most important techniques for personal identification. However, objective and unbiased evaluation methods that would compare the fingerprints with diverse available and developing methods are currently lacking. To develop an objective and quantitative method to improve fingerprint evaluation, a preliminary study was performed to extract useful research information from the analysis with densitometric image analysis (CP Atlas 2.0) and the Automated Fingerprint Identification System (AFIS) for the developed fingerprints on porous surfaces. First, inked fingerprints obtained by varying pressure (kg.f) and pressing time (sec.) to find optimal conditions for obtaining fingerprint samples were analyzed, because they could provide fingerprints of a relatively uniform quality. The extracted number of minutiae from the analysis with AFIS was compared with the calculated areas of friction ridge peaks from the image analysis. Inked fingerprints with a pressing pressure of 1.0 kg.f for 5 seconds provided the most visually clear fingerprints, the highest number of minutiae points, and the largest average area of the peaks of the friction ridge. In addition, the images of the developed latent fingerprints on thermal paper with the iodine fuming method were analyzed. Fingerprinting condition of 1.0 kg.f/5 sec was also found to be optimal when generating highest minutiae number and the largest average area of peaks of ridges. Additionally, when the concentration of ninhydrin solution (0.5 % vs. 5 %) was used to compare the developed latent fingerprints on print paper, the best fingerprinting condition was 2.0 kg.f/5 sec and 5 % of ninhydrin concentration. It was confirmed that the larger the average area of the peaks generated by the image analysis, the higher the number of minutiae points was found. With additional tests for fingerprint evaluation using the densitometric image analysis, this method can prove to be a new quantitative and objective assessment method for fingerprint development.

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.1894-1896
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• 2004

전력을 공급하는 변전소 등의 주요 위치에 시설되는 GIS는 사고를 미연에 방지하기 위해 여러 가지 진단방법을 이용하여 이상여부를 판별한다. 이러한 진단 방법 중 현재 국내외적으로 각광을 받고 있는 방법이 UHF센서를 이용한 부분방전 검출방법이다. 따라서, 본 논문에서는 부분방전을 발생시키기 위한 인공결함을 제작하여 GIS 내부에 삽입하고 부분 방전을 발생시켰으며, 이때 발생된 부분방전 신호를 UHF센서를 이용하여 검출하였다. 검출된 부분방전 신호는 phi-f-q 방법으로 분석 하였으며, 그 결과 발생된 파라메터를 인공신경망에 적용하여 각각의 결함에 따른 인식률에 대하여 알아보았다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.2
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• pp.147-155
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• 2016

Purpose: In this study, the relationship between the interpersonal relationships, clinical stress and satisfaction of clinical practice among nursing was examined. Method: The participants were 261. Data collected from 7 September to 18 September 2015 were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficients, and stepwise multiple regression. Result: The mean scores for the interpersonal relationship ($3.74{\pm}0.39$), stress ($3.21{\pm}0.54$), and satisfaction ($3.44{\pm}0.45$) in clinical practice were above average. Interpersonal relationships differed significantly according to year (F=3.12, p=.046), satisfaction with nursing as a major (F=15.84, p<.001), important of interpersonal relationships (F=4.76, p=.001), and academic achievement (F=3.80, p=.011). Stress in clinical practice differed significantly according to the year (F=8.05, p<.001), application motivation (F=4.55, p=.001) and satisfaction with nursing as a major (F=2.69, p=.046). Satisfaction in clinical practice differed significantly according to satisfaction with nursing as a major (F=3.24, p=.022), important of interpersonal relationships (F=3.01, p=.019), and academic achievements (F=5.24, p=.002). Significant correlations were observed between the interpersonal relationships and satisfaction in clinical practice (r=.24, p<.001). Interpersonal relationship (${\beta}=.21$, p<.001), academic achievements (${\beta}=.12$, p=.045) were factors influencing satisfaction in clinical practice. Conclusion: The interpersonal relationships need to be improved to increase nursing students' satisfaction with clinical practice