• Title, Summary, Keyword: selective media

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Semi-selective Medium for Monitoring Colletotrichum acutatum Causing Pepper Anthracnose in the Field (고추 탄저병균Colletotrichum acutatum 의 포장 밀도 조사를 위한 반선택 배지의 확립 및 활용)

  • Kang, Beum-Kwan;Min, Ji-Young;Kim, Yun-Sik;Park, Sung-Woo;Nguyen, Van-Bach;Kim, Heung-Tae
    • Research in Plant Disease
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    • v.11 no.1
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    • pp.21-27
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    • 2005
  • It was confirmed that anthracnose pathogen, Colletotrichum acutatum, could specifically grow on PDA amended with $100\mu\textrm{g}$ /ml of ampicillin and tetracycline, and 100 $100\mu\textrm{g}$/ml of mixture with carbendazim and diethofencarb. There was a positive correlation between the number of colony enumerated on semi-selective media and the disease severity on pepper fruits caused by C. acutatum. Using semi-selective media for C. acutatum, the number of pathogen on soil and plant debris infected by anthracnose pathogen was investigated. In plant debris, the colony number of C. acutatum was more than in soil. For the identification of colony appeared on semi-selective media, 10 isolates were selected randomly. They were identified as C. acutatum through PCR using C. acutatum-specific primer.

Analyzing Public Opinion with Social Media Data during Election Periods: A Selective Literature Review

  • Kwak, Jin-ah;Cho, Sung Kyum
    • Asian Journal for Public Opinion Research
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    • v.5 no.4
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    • pp.285-301
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    • 2018
  • There have been many studies that applied a data-driven analysis method to social media data, and some have even argued that this method can replace traditional polls. However, some other studies show contradictory results. There seems to be no consensus as to the methodology of data collection and analysis. But as social media-based election research continues and the data collection and analysis methodology keep developing, we need to review the key points of the controversy and to identify ways to go forward. Although some previous studies have reviewed the strengths and weaknesses of the social media-based election studies, they focused on predictive performance and did not adequately address other studies that utilized social media to address other issues related with public opinion during elections, such as public agenda or information diffusion. This paper tries to find out what information we can get by utilizing social media data and what limitations social media data has. Also, we review the various attempts to overcome these limitations. Finally, we suggest how we can best utilize social media data in understanding public opinion during elections.

Evaluation of enrichment broth and selective media for the detection of non-O157 enterohemorrhagic Escherichia coli (Non-O157 장출혈성대장균 검출을 위한 증균배지 및 선택배지 성능 평가)

  • Lee, Da Yeon;Kim, Hee-eon;Seo, Dong Won;Cho, Yong Sun
    • Korean Journal of Food Science and Technology
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    • v.48 no.4
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    • pp.323-328
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    • 2016
  • In this study, specific and rapid enrichment and growth conditions for the most important, classic non-O157 enterohemorrhagic Escherichia coli (EHEC) serogroups were assessed. Three enrichment broth types, namely, EC medium with MUG broth, BRILA broth, and mTSB broth with novobiocin, were compared to identify the optimum enrichment broth for EHEC isolation. Four kinds of selective media, namely, ENDO agar, Chromocult agar, TBX agar, and CHROMagar$^{TM}$ STEC medium, were compared to identify the optimum one for non-O157 EHEC isolation. The results suggested that incubation in EC medium with MUG broth at $42^{\circ}C$ for 20 h is optimum for the enrichment of non-O157 EHEC. TBX agar was identified to have the highest specificity among the tested media. Consequently, a combination of complementary selective media according to serotype must be considered for comprehensive isolation of specific EHEC.

High performance OTFT using PEDOT:PSS on plastic substrate by inkjet printing

  • Lee, Myung-Won;Choi, Jae-Chul;Park, Jong-Seung;Song, Chung-Kun
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.874-876
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    • 2009
  • This is a report on fabrication and electrical characteristics of pentacene OTFT that uses conducting PEDOT/PSS as source drain electrodes. We demonstrate enhanced conductivity of PEDOT/PSS film with glycerol and optimize properties for ink jet printing. We also present the application of oxygen plasma technique in order to favor selective spreading for subsequent inkjet printing.

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An Optimal Selective Protection Scheme for Scalable Video Coding

  • Hendry, Hendry;Kim, Munchurl
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.294-295
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    • 2011
  • The fundamental problem of selective protection scheme for encoded bitstreams is to find an efficient algorithm to select the set of frames required to be encrypted that can maximize protection effect with the minimum amount of protected data is required. In this paper, we propose an optimal selective protection scheme for SVC bitstreams by protecting the best combination of frames for selective protection in the sense that the amount of data required for protection is minimized and the resulting visual quality degradation is maximized. The selection of the frames to be encrypted is done by first expressing R-Q (protection rate - visual quality) relationship with Lagragian cost model. The experimental results show that, compared to protecting SVC bitstreams layer by layer, the proposed scheme gives superior performance in terms of protection effectiveness due to its better selection of frames for protection given protection bit budgets.

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A Selective Protection Scheme for Scalable Video Coding Based on Dependency Graph Model

  • Hendry, Hendry;Kim, Munchurl
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.78-81
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    • 2010
  • In this paper, we propose an efficient and effective selective protection scheme to SVC that exploit the propagation of protection effect by protecting significant frames that can give the maximum visual quality degradation. We model SVC dependency coding structure as a directed acyclic graph which is characterized with an estimated visual quality value as the attribute at each node. The estimated visual quality is calculated by using our model based on the proportions of intra- and inter-predicted MBs, amounts of residual, and estimated visual quality of reference frames. The proposed selective protection scheme traverses the graph to find optimal protection paths that can give maximum visual quality degradation. Experimental results show that the proposed selective protection scheme reduces the required number of frames to be protected by 46.02% compared to the whole protection scheme and 27.56% compared to the layered protection scheme.

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Safety Investigation of Tap Water and Biofilm by Isolated Bacteria (수돗물과 생물막의 세균분포를 통한 안전성 조사)

  • Lee, Dong-Geun
    • Journal of Environmental Health Sciences
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    • v.30 no.3
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    • pp.207-213
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    • 2004
  • For investigation of the food safety and influence of biofilm on the bacterial quality of tap water, it was detected by selective media, and identified by API kit and MIDI system. Biofilm and effluent showed much more colonies than influent. Although there were many presumptive positive colonies, no pathogenic bacterium detected. However opportunistic pathogens, such as Pseudomonas aeruginosa and Aeromonas species, and members of family Enterobacteriaceae were detected. Compared to influent, biofilm and effluent showed more diverse bacteria. This study implies that there would be the negative influence of biofilm on the bacterial qualities of tap water.

Antecedents of News Consumers' Perceived Information Overload and News Consumption Pattern in the USA

  • Lee, Sun Kyong;Kim, Kyun Soo;Koh, Joon
    • International Journal of Contents
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    • v.12 no.3
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    • pp.1-11
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    • 2016
  • This exploratory study examines the critical factors associated with news consumers' perception of information overload and news consumption patterns. An online survey was conducted with Qualtrics panels (N = 1001). The demographics and three antecedent factors of perceived information overload were considered including the frequency of news access through multiple media platforms, level of attention to news, and interest in news. Three news consumption patterns were investigated as possible consequences of perceived information overload: news avoidance, selective exposure, and willingness to pay for news. The results of hierarchical regression analyses revealed a meaningful distinction between general and news information overload. Overall, news consumers who paid more attention to news through newer media/platforms/devices perceived higher levels of information overload, were more willing to pay for the news, and often avoided news or selectively exposed themselves to certain sources of news to manage news information overload.

Selective nitrification and denitrification in fixed bed biofilm reactors

  • Yun, Ho-Jun;An, Seung-Ho;Kim, Dong-Jin
    • 한국생물공학회:학술대회논문집
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    • pp.278-281
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    • 2001
  • A fixed bed biofilm reactor filled with ceramic media were used to remove nitrogen by selective nitrification (ammonium to nitrite). The effects of experimental conditions (nitrogen load, dissolved oxygen, nitrite ratio, C/N ratio) on denitrification were investigated. The reactor showed more than 80% average T-N removal efficiencies at T-N loading in the range of $1.1{\sim}3.3$ kg $T-N/m^3{\cdot}d$ C/N at the C/N ratio of 1. T-N removal efficiencies increased as nitrite ratio.

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