• 천문학회보
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• 제43권2호
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• pp.41.3-42
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• 2018

Redshift space distortion (RSD) is known as a powerful cosmological probe. The large-scale RSD has been detected by various redshift surveys and continues to be a major target of ongoing surveys. On the other hand, the small-scale RSD, called finger-of-god (FoG) effect, also has cosmological information, because different cosmological parameters cause different halo mass functions and viriarized velocities. We define the "length" of FoG and examine its dependence on cosmological parameters using the Multiverse simulation. We also use the SDSS DR7 data to see how strong constraints current data sets could provide. It is found that the volume-limited subsample D5, consisting of ~100,000 galaxies at z~0.08, yields $\Delta \Omega_m ~ 0.02$.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2011년도 추계학술발표대회
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• pp.326-329
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• 2011

안개나 스모그 등으로 인한 영상의 왜곡에 대해 Dark Channel Prior 를 이용해 안개제거를 하면 깨끗한 결과 영상을 얻을 수 있다. 하지만 이 기법에서 전달량을 정련할 때 많은 시간이 걸리는데 계산 속도 면을 개선하기 위해 Gaussian Filter 를 사용해 정련한다. 이 때 단순한 Gaussian Filter 를 사용하게 되면 결과영상에서 후광효과가 생기게 된다. 후광효과를 줄이기 위해 본 논문에서 제안한 적응 Gaussian Filter 를 사용해 영상을 복원시킨다.

• 펄프종이기술
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• 제40권2호
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• pp.29-36
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• 2008

In order to give pulp surfaces anti-bacterial functionality and photo-catalytic deodorant ability, functional pulps was made using a surface modification method with Ag nano-colloidal solution and $TiO_2$ filler. Hygiene paper was made with the specially modified pulp, and anti-bacterial and deodorant tests were carried out. The Ag nano-colloidal solution was coated on the surface of the pulp using the high pressurized gas phase squirt through the spray nozzle mounted on the hybridization system. The surface modified functional pulp was hybridized with the optimum ratio of $TiO_2$(fine particle) to pulp(core particle) under the condition of $6,000{\sim}10,000$ rpm for $3{\sim}7$ minutes in the system. The anti-bacterial functionality of the hygiene paper was confirmed by the halo test in which the formation of the clear zone around the hygiene paper sample was observed. The inhibition growth test using MIC bioscreen C showed the inhibition growth effect of the bacteria as the reaction time was increased. The photo-catalytic effect measurement of the $TiO_2$ for 4 hours of the reaction showed $50{\sim}60%$ of decomposition rate, reaching over 60% for 5 hours of the reaction.

• Fibers and Polymers
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• 제3권3호
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• pp.97-102
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• 2002

A series of waterbome poly(urethane-urea) anionomers were prepared from isophorone diisocyanate (IPDI), polycaprolactone diol (PCL), dimethylol propionic acid (DMPA), ethylene diamine (EDA), and triethylamine (TEA), NaOH, or Cu($(COOCH_3)_2$) as neutralizing agent. This study was performed to decide the effect of neutralizing agent type on the particle size viscosity, hydrogen bonding index, adhesive strength, antistaticity, antibacterial and mechanical properties. The particle size of the dispersions decreased in the following order: TEA based samples (T-sample), NaOH based samples (N-sample), and Cu($(COOCH_3)_2$) based sample (C-sample). The viscosity of the dispersions increased in the order of C-sample, N-sample, and T-sample. Metal salt based film samples Of and C-sample) had much higher antistaticity than TEA based sample. By infrared spectroscopy, it was found that the hydrogen bonding index (or fraction) of samples decreased in the order of T-sam-pie, N-sample, and C-sample. The adhesive strength and tensile modulus/strength decreased in the order of T-sample, N-sam-pie, and C-sample. The C-sample had strong antibacterial halo, however, T- and N-samples did not

• 한국콘텐츠학회논문지
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• 제18권8호
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• pp.240-254
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• 2018

본 연구는 웹드라마 산업이 발달함에 따라 관심이 증폭되는 시점에서 웹드라마 흥행에 미치는 요인이 무엇인지에 대해 실증적으로 검증하고자 하였다. 기존 연구는 웹드라마의 현황분석이 주를 이루고 있으며 웹 드라마의 흥행에 영향을 미치는 요인에 대한 연구가 부족하였다. 따라서 본 연구는 웹드라마의 누적 조회수의 누적 랭킹을 제공하고 있는 사이트인 컨스TV를 통해 2016년 2월 1일부터 2016년 3월 1일까지의 기간에 상영된 누적순위 1위부터 100위를 대상으로 팬덤의 유무가 웹드라마 흥행에 미치는 영향에 대하여 연구 하였다. 연구 결과 팬덤은 웹드라마의 흥행에 긍정적인 영향을 주었는데, 원작(웹툰, 웹소설)이 있는 경우와 아이돌이 출연하는 경우 웹드라마 흥행에 유의미한 관계가 있는 것으로 분석되었다. 또한 팬덤이 웹드마라에 미치는 긍정적 영향은 웹드라마의 정기 구독자를 나타내는 채널구독자수를 통해서 이루어진다는 매개효과를 발견했다.

• Biomolecules & Therapeutics
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• 제4권3호
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• pp.285-290
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• 1996

This study was designed to determine the effect of newly synthesized antiulcer agent, 5-pyrrolyl-6-halo-2-(pyridyl-2-methylthio)benzimidazole derivatives (IY-81233), on various experimental ulcers and on the secretion of prostaglandin $E_2(PGE_2)$ into the gastric lumen of rat. IY-81233 was previously reported to have a strong inhibitory effect on $H^+/K^$-ATPase and on gastric acid secretion in rats. Oral administration of IY-81233 at concentrations of 0.2, 2.0, and 20 mg/kg inhibited gastric lesions and duodenal ulcer induced by indomethacin, HCI-ethanol, water-immersion stress, cysteamine, and acetic acid in a dose dependent manner. Their IC$IC_{50}$ values were 3.4, 1.4, 0.8, 1.3, and 1.2 mg/kg, respectively. These results indicate that IY-81233 is a potent antiulcer agent although it is slightly less potent than omeprazole in healing of gastritis and ulcers. The secretion of $PGE_2$ into gastric lumen was also investigated in relation to the cytoprotective effect by IY-81233 in rats. The $PGE_2$ level was not changed significantly by an oral administration of IY-81233, suggesting that IY-81233 has little effect on the gastric protection. Therefore, it can be concluded that IY-81233 exerts prominent antiulcer activity by suppressing gastric acid secretion via an inhibition of a proton pump and not by protecting the gastrointestinal mucosa against various ulcerative stimuli.

• 한국콘텐츠학회논문지
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• 제19권5호
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• pp.296-305
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• 2019

한류의 성장과 더불어 팬덤 경제의 중요성이 제기됨에 따라 한류가 가지고 있는 경쟁력을 팬덤의 관점과 더불어 고려할 필요가 있다. 특히 팬덤 현상은 자신이 선호하는 스타를 동일시하고, 팬 커뮤티니에 관련 정보를 적극적으로 획득 및 공유하는 특성을 나타내고 있다. 이에 따라 본 연구에서는 중국, 일본, 베트남 소비자들 대상으로 한국의 국가 이미지가 한류 콘텐츠 이용의도에 미치는 영향관계를 파악하고, 팬덤 동일시의 매개효과를 검정하였다. 실증분석 결과 문화 이미지, 기업 이미지, 제품 이미지는 한류 콘텐츠 이용의도에 통계적으로 유의한 영향을 미치는 것으로 나타났다. 또한, 스타 동일시와 팬 커뮤니티 동일시는 문화 이미지가 한류 콘텐츠 이용의도에 미치는 영향 관계에서 부분매개를 하는 것으로 나타났다. 본 연구 결과는 한류를 국가 이미지 향상을 위한 후광효과 관점이, 아닌 한류의 지속적인 발전을 위한 선행요인임을 검정하고, 팬덤 현상의 매개효과를 실증적으로 검정하였다는 점에서 시사점을 갖는다.

• Archives of Pharmacal Research
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• 제15권3호
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• pp.263-268
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• 1992

In order to evaluate the antimicrobial effect of 2, 3-disubstitued-1, 4-naphtoquinone derivatives we newly synthesized several 2-bromo-3-(substituted)-1, 4 naphthoquninones. Amination reaction of 2, 3-dihalo-1, 4 naphthoquinones with aryl and aliphatic amines in ethanol gave 2-halo-3-(N-alkyl or N-aryl)1, 4-naphtoquinone derivatives (1a, b-10a, b) i 60% 90%) yield. These derivatives subjected to antibacterial and antifungal activities. in vitro, against Bacilllus subtilis ATCC 6633 Candida albicans 10231 and local, Psudomonas aeruginosa NCTC10490, Staphylococcus aureus ATCC 6538p. Escherichia coli NIHJ Aspergillus niger KCTC 1231, Tricophyton mentagrophytes KCTC 6085. Among these derivatives 1b, 6b and 7a showed the potent antibacterial activities 1b, 8b and 9b have derivatives, 1b, 6b and 7a showed the potent antibacterial activities. 1b, 8b and 9b have the antifungal activities. 1b is most effective in preventing the growth of Bacillus subtilis and Psudomonas aeruginosa. Candida albicans. Aspergillus niger. Tricophyton mentagrophytes. The several of these compounds demonstrated a broad spectrum of activities in vitro.

• Molecules and Cells
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• 제38권9호
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• pp.789-795
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• 2015

A chromosome territory is composed of chromosomal subdomains. The internal structure of chromosomal subdomains provides a structural framework for many genomic activities such as replication and DNA repair, and thus is key to determining the basis of their mechanisms. However, the internal structure and regulating proteins of a chromosomal subdomain remains elusive. Previously, we showed that the chromosome territory expanded after BAF53 knockdown. Because the integrity of chromosomal subdomains is a deciding factor of the volume of a chromosome territory, we examined here the effect of BAF53 knockdown on chromosomal subdomains. We found that BAF53 knockdown led to the disintegration of histone H2B-GFP-visualized chromosomal subdomains and BrdU-labeled replication foci. In addition, the size of DNA loops measured by the maximum fluorescent halo technique increased and became irregular after BAF53 knockdown, indicating DNA loops were released from the residual nuclear structure. These data can be accounted for by the model that BAF53 is prerequisite for maintaining the structural integrity of chromosomal subdomains.

• 천문학회보
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• 제38권2호
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• pp.37.1-37.1
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• 2013

We present our study of analyzing the photometric properties of the globular cluster (GC) system which resides in the extended halo of the central bright Coma cluster galaxy NGC 4874. The core of the Coma cluster of galaxies (Abell 1656) was observed with both the HST Advanced Camera for Surveys (ACS) in the F475W (g475) and F814W (I814) and Wide Field Camera 3 IR Channel (WFC3/IR) in the F160W (H160) filters. The data analysis procedure and GC candidate selection criteria are briefly described. We investigate the interesting "tilt" features in color-magnitude diagrams for this GC system and their link to the nonlinear color-metallicity relation for GCs. The NGC 4874's GC system exhibits a bimodal distribution in the optical g475-I814 color and much more than half the GCs fall in the red side at g475-I814 ~ 1.1. This bimodality is weakened in the optical-IR I814-H160 color; the quantitative analysis on the features of both color distributions using the Gaussian Mixture Modeling code proves the bimodalities are different. Both colors, thus, cannot linearly reflect the bimodality of an underlying metallicity, supporting the suggestion that observed bimodalities in extragalactic GC colors are the metallicity-to-color projection effect.