• Broadcasting and Media Magazine
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• v.24 no.3
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• pp.35-49
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• 2019

본 고에서는 혼합현실(Mixed Reality, MR) 기반의 서비스를 위한 제작과 관련된 동향과 기술에 대해서 살펴본다. MR이란 증강현실과 가상현실의 장점을 통합하고 사용자와의 인터랙션을 더욱 강화한 방식으로 정의할 수 있는데, 이를 위해 사람에 대해 실사 형태를 가지면서 360도의 전방위 관찰이 가능한 동적인 3D모델 제작기술이 가장 핵심적인 요소이다. 특히 MR 기술 중에서 최근 5G 및 6G 기술의 시대와 함께 실사 객체 및 장면에 대한 3차원 그래픽스와 영상처리 기술을 이용한 6DoF 기반의 실사 애니메이션 제작 기술에 대해서 주로 다루고자 한다. 또한 국내외 기술적 수준을 바탕으로 국내외 시장 동향에 대해서 살펴보고, MR 기술이 시장에 미치는 파급효과와 활용 분야에 대해서도 다룬다.

• Journal of Life Science
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• v.30 no.5
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• pp.443-451
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• 2020

Recently, thrombotic diseases have become rapidly more prevalent due to Westernized lifestyles and high-fat diets. In this study, the anti-thrombosis activities of the aerial parts of Sageretia thea were evaluated using ethanol extracts of the leaf (ST-L), branch (ST-B), and fruit (ST-F), and their anti-coagulation, platelet aggregation inhibition, and hemolytic toxicity were assessed. In comparison to the ST-F extract, the ST-B exhibited 6.7 times more polyphenol content, and the ST-L had 2.7 times more total flavonoid content. The ST-L and ST-B extracts showed stronger inhibitions of thrombin, prothrombin, and blood coagulation factors than aspirin, berry extracts, or commercial oriental herbs. Furthermore, ST-L and ST-B showed superior platelet aggregation-inhibitory activities than aspirin. The ST-F extract demonstrated only minor anti-thrombosis effects, and none of the extracts showed hemolysis against red blood cells up to 1 mg/ml. Phenolic acid and flavonoid analysis of the ST-L and ST-B extracts showed abundant rutin, isoquercitrin, and astragalin as the major active compounds. Further research on the anti-thrombotic activity of isoquercitrin, a rare flavonoid from quercetin, is necessary. This is the first report of isoquercitrin in Sageretia thea, and our results suggest that ST-L and ST-B extracts could therefore developed as anti-thrombosis agents.

• Pediatric Infection and Vaccine
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• v.20 no.2
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• pp.53-62
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• 2013

Purpose: The cross-protection of 7-valent pneumococcal conjugate vaccine (PCV7) against vaccine-related serotypes has been controversial. We investigated the serological properties of cross-protective antibodies against vaccine-related serotypes 6A, 6C, and 19A induced in young children aged 12-23 months after booster immunization of PCV7. Methods: IgG and IgM antibody concentrations and opsonic index (OI) against vaccine serotypes 6B and 19F and vaccine-related serotypes 6A, 6C, and 19A were measured by ELISA and opsonophagocytic killing assay (OPA) in 4 selected immunesera. The serological properties and antigenic specificity of protective antibodies were determined by IgM depletion of immunesera, OPA, and competitive OPA against serogroup 6 and 19 pneumococci. Results: Compared to pre-IgM depleted immunesera, OI of IgM-depleted immunesera against 6B and 19F decreased and OI against 6A, 6C, and 19A decreased, too. In competition OPA, free 6B and 19F polysaccharide completely inhibited the immune protection against vaccine-related serotypes 6A, 6C, and 19A as well as vaccine types 6B and 19F. Conclusions: The booster immunization of PCV7 certainly induced cross-protective antibodies against vaccine-related serotypes 6A, 6C, and 19A with both IgG and IgM isotypes. Furthermore, IgM antibodies are more highly contributed to opsonophagocytic activity against vaccine-related serotypes as well as most of vaccine types than do IgG antibodies. Further studies are needed for the more immunized sera in the children as well as adults.

• Genomics & Informatics
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• v.18 no.2
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• pp.20.1-20.4
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• 2020

Accessible negative results are relevant for researchers and clinicians not only to limit their search space but also to prevent the costly re-exploration of research hypotheses. However, most biomedical relation extraction datasets do not seek to distinguish between a false and a negative relation among two biomedical entities. Furthermore, datasets created using distant supervision techniques also have some false negative relations that constitute undocumented/ unknown relations (missing from a knowledge base). We propose to improve the distinction between these concepts, by revising a subset of the relations marked as false on the phenotype-gene relations corpus and give the first steps to automatically distinguish between the false (F), negative (N), and unknown (U) results. Our work resulted in a sample of 127 manually annotated FNU relations and a weighted-F1 of 0.5609 for their automatic distinction. This work was developed during the 6th Biomedical Linked Annotation Hackathon (BLAH6).

• 한국정보디스플레이학회:학술대회논문집
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• 2000.01a
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• pp.65-66
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• 2000

Various fluoride films on a glass substrate were prepared and characterized to provide a seed layer for crystalline Si film growth. The XRD analysis on $CaF_2/glass$ illustrated (220) preferential orientation and showed lattice mismatch less than 5 % with Si. We achieved a fluoride film with breakdown electric field of 1.27 MV/cm, leakage current density about $10^{-6}$ $A/cm^2$, and relative dielectric constant less than 5.6. This paper demonstrates microcrystalline silicon $({\mu}c-Si)$ film growth by using a $CaF_2/glass$ substrate. The ${\mu}c-Si$ films exhibited crystallization in (111) and (220) planes, grain size of $700\;{\AA}$, crystalline volume fraction over 65 %, dark- and photo-conductivity ratio of 124, activation energy of 0.49 eV, and dark conductivity less than $4{\times}10^{-7}$ S/cm.

• Journal of Veterinary Science
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• v.21 no.6
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• pp.85.1-85.6
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• 2020

A cold-adapted porcine reproductive and respiratory syndrome virus (CA-VR2332) was generated from the modified live virus strain VR2332. CA-VR2332 showed impaired growth when cultured at 37℃ with numerous mutations (^S731^F, ^E819^D, ^G975^E, and ^D1014^N) in the hypervariable region of the NSP2, in which the mutation ^S731^F might play a vital role in viral replication at 30℃. Conserved amino acid sequences of the GP5 protein suggests that CA-VR2332 is a promising candidate for producing an effective vaccine against PRRSV infection. Further studies on replication and immunogenicity in vivo are required to evaluate the properties of CA-VR2332.

• Journal of the Korean earth science society
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• v.27 no.6
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• pp.670-676
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• 2006

We present a B and V band time-series CCD photometry of ${\delta}$ Scuti type variable star HR 2707. The observation was carried out for 45 nights between November 13, 2001 and February 20, 2002 with a 40 cm telescope equipped with a 1K CCD camera at the Korea National University of Education Optical Astronomy Observatory. Through the time-series CCD photometry we obtained 3011 V band and 6562 B band CCD frames. In some of these data, the V band data obtained for seven nights in January of 2002, had been used as a part of a multi-site campaign by Lopez de Coca et al. (2003). To detect pulsational frequencies, we used Discrete Fourier Transformation (DFT) and linear least square method. We have detected eight resonable pulsational frequencies and compare to previous studies we determine $f_1,\;f_2,\;f_3,\;f_4,\;f_5$ of Lopez do Coca et al. (2003) and $f_4$ for derived from this study are real pulsational frequencies of HR 2707.

• Proceedings of the KIEE Conference
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• 1998.11c
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• pp.737-739
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• 1998

Gate insulators using various fluoride films were investigated for thin film transistor applications. Conventional oxide containing materials exhibited high interface states, high $D_{it}$ gives an increased threshold voltage and poor stability of TFT. To improve TFT performances, we must reduce interface trap charge density between Si and gate insulator. In this paper, we investigated gate insulators such as such as $CaF_2$, $SrF_2$, $MgF_2$ and $BaF_2$. These materials exhibited an improvement in lattice mismatch, difference in thermal expansion coefficient, and electrical stability MIM and MIS devices were employed for an electrical characterization and structural property examination. Among the various fluoride materials, $CaF_2$ film showed an excellent lattice mismatch of 0.737%, breakdown electric field higher than 1.7MV/cm and leakage current density of $10^{-6}A/cm^2$. This paper probes a possibility of new gate insulator material for TFT application.

• Journal of Food Hygiene and Safety
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• v.24 no.3
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• pp.189-193
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• 2009

The purpose of this study was to investigate the antimicrobial activities of natural antimicrobials (10 formulas, $F1{\sim}F10$) against yeasts in functional beverages. The growth rates of yeasts were different with the ten different natural antimicrobial formulas tested. Yeasts grew for 14 days and the antimicrobial effect was observed between 14 and 18 days. Levels of S. cerevisiae, Z. bailii, and P. membranaefaciens were reduced to the limit of detection (ND) < 10 CFU/mL) after 28 days. Resistance against the antimicrobial effect was greatest for P. membranaefaciens, which grew to a level of $0.12{\sim}1.48\;\log_{10}\;CFU$/mL after 14 days and was reduced to a level of $1.61{\sim}3.55\;\log_{10}\;CFU$/mL after 28 days. The resistance of C. albicans was also high with a growth level of $0.13{\sim}1.28\;\log_{10}\;CFU$/mL after 14 days and reduction to $1.51{\sim}5.30\;\log_{10}\;CFU$/mL after 28 days. The antimicrobial effect of F10 was strongest for P. membranaefaciens. Every treatment reduced the microbial levels to $2.68{\sim}5.62\;\log_{10}\;CFU$/mL after 6 months. F2, F4, F5, F6, and F10 reduced the C. albicans level to ND after 28 days while F1, F3, F8, and F9 reduced yeasts to the ND level after 6 months. The antimicrobial activities observed here will be useful for development of natural antimicrobials.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.3
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• pp.627-631
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• 2007

The factors affecting on sludge sedimentation are reported as F/M ratio, ingredient, composition of influent substrate, dissolved oxygen concentration, temperature, pH, filamentous bacteria and SRT. Aeration tank applying Bacillus sp. has an important role for maintaining the dominant microorganism species to make steady progress for spore growth affecting sedimentation. This research aims to investigate the affecting factor for the sedimentation in B3 system and RABC system with aeration tank applying tapered aeration. Extracellular polymeric substances(EPS), protein and carbohydrate can be produced for the extreme condition, that is down to 0.2 mg/L of dissolved oxygen in the aeration tank. This research found out the relation between the sedimentation and the EPS production, especially the ratio of protein/carbohydrate. The spore of Bacillus sp. was formed at the low DO then microorganisms produced EPS. The results showed that the production of EPS was 109.95 mgEPS/gSS at 1.6 mg/L of DO, however it was 131.77 mgEPS/gSS at 0.5 mg/L of DO. The sedimentation was affected by protein content in EPS and the ratio of protein and carbohydrate. The settleability of sludge was not affected by the ratio of protein/carbohydrate in B3 process, meanwhile settleability was affected by the ratio of it in RABC process, respectively.