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Porous ZnO-ZnSe nanocomposites for visible light photocatalysis.
Cho, Seungho,Jang, Ji-Wook,Lee, Jae Sung,Lee, Kun-Hong RSC Pub 2012 Nanoscale Vol.4 No.6
<P>We report the synthesis of porous ZnO-ZnSe nanocomposites for use in visible light photocatalysis. Porous ZnO nanostructures were synthesized by a microwave-assisted hydrothermal reaction then converted into porous ZnO-ZnSe nanocomposites by a microwave-assisted dissolution-recrystallization process using an aqueous solution containing selenium ions. ZnO and ZnSe nanocrystallites of the nanocomposites were well-mixed (rather than forming simple core-shell (ZnO-ZnSe) structures), particularly, in the outer regions. Both ZnO and ZnSe were present at the surface and exposed to the environment. The porous ZnO-ZnSe nanocomposites showed absorption bands in the visible region as well as in the UV region. The porous ZnO-ZnSe nanocomposites had much higher activities than the porous ZnO nanostructures. Control experiments using cutoff filters revealed that the main photocatalytic activity of the synthesized nanostructures arose from photo-excitation of the semiconductor (ZnO or ZnSe) via absorption of light of an energy equal to or exceeding the band gap energy.</P>
Evaluation of the Flexural Performance and CO<sub>2</sub> Emissions of the Voided Slab
Cho, Seungho,Na, Seunguk Hindawi Limited 2018 Advances In Materials Science And Engineering Vol.2018 No.1
<P>Reinforced concrete is regarded as one of the ideal structural materials which comprises concrete with high compressive strength and reinforcing bars with high tensile strength. However, concrete has been pointed out that it consumes a large volume of energy and emits a lot of carbon dioxide during its manufacturing. In order to lower such environmental burdens of concrete structures, a number of studies and approaches have been carried out. The voided slab is also suggested as a new method to reduce the environmental burden since voided section of the slab would use less concrete compared with the normal reinforced concrete slab. However, no studies have evaluated the CO2 emissions and environmental performance of voided slabs. The purpose of this study was to evaluate the structural performance of voided slabs and empirically corroborate their environmental influence. The flexural performance test was carried out based on the variables of the depth of slab, types of the void former materials, and the hollowness ratio. In addition, comparison of the emission of CO2 was also performed by considering the hollowness ratio and types of void former materials over the normal reinforced concrete slab. The structural performance of the voided slab was similar or slightly higher than the normal reinforced concrete slab. The yield strength of specimens was increased approximately 10∼30% over the anticipated yield strength. Based on this result, it is considered that the voided slab would be sufficient to structural performance and beneficial to plane planning in buildings. In general, it is considered that the voided slab would be beneficial to both structural and environmental aspects. However, the test results in this research showed that the voided slab would emit more carbon dioxide emissions compared to the normal reinforced concrete slab. The main source of more CO2 emissions in the voided slab was the anchoring materials. In this research, wires were used to fix the void former materials to the reinforcing bars. In order for the voided slab to become a more eco-friendly and sustainable material, new anchoring methods such as use of recycled materials, new void former materials without anchoring, or other eco-friendly materials should be applied to reduce the emission of CO2.</P>
Single crystalline zinc structures synthesized spontaneously in solution
Cho, Seungho,Lee, Kun-Hong Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.33
<P>We report a method for the synthesis of Zn structures with a variety of morphologies through a spontaneous solution phase reaction without application of an electropotential under ambient conditions. We also describe, in detail, the influence of several experimental conditions on the morphology and microstructure of the Zn structures. The morphology of the Zn structures transitioned from hexagonal disks to dendritic forms as the reaction temperature was increased due to an increase in the driving force for Zn structure formation (over a temperature range from room temperature, 22 °C, to 95 °C). The size of the Zn structures was controlled by adjusting the concentration of zinc acetate dihydrate added to the reaction solution. When the concentration of zinc salt was reduced, smaller Zn structures were synthesized. Control experiments revealed that the aluminium layer, ammonia additions, and ammonia concentration were key factors for the formation of Zn metal structures. A zinc ion complex, Zn(NH<SUB>3</SUB>)<SUB>4</SUB><SUP>2+</SUP>, played a critical role in the formation of the Zn structures. Zn nanowires were synthesized in the presence of a 1.5 μm thick Al layer substrate. Based on these observations, we propose possible formation mechanisms for the spontaneous assembly of the various Zn structures.</P> <P>Graphic Abstract</P><P>Single crystalline zinc structures with a variety of morphologies were synthesized through a spontaneous solution phase reaction. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm00969e'> </P>
Seungho Cho,Junsoo Hur 위기관리 이론과 실천 2015 Crisisonomy Vol.11 No.9
Reputation is formed by the public, not by an organization or an individual. It is important to understand how people perceive a situation when a celebrity has a crisis, but members of different cultures may have different perceptions of the crisis that may require different types of crisis communication strategies. Cultural differences that led to differing perceptions between people in the U.S. and South Korea one year after the Tiger Woods’ sex scandal were investigated in this study. Results show that people in the two countries saw this crisis differently and that Tiger Woods’ involvement with charitable social activities had an influence on people’s perception about his comeback and endorsements.
The Difference between News Coverage and News Release of Political Parties During A Political Crisis
SeungHo Cho(조승호) 한국콘텐츠학회 2018 한국콘텐츠학회논문지 Vol.18 No.11
본 연구의 목적은 정치적 위기 상황에서 위기대응에 대한 언론보도와 정당의 차이를 조사하는 것이다. 과거 정치적 사례를 통해 정치적 상황, 정치적 집단의 위기대응, 언론보도를 살펴보았다. 본 연구가 살펴본 사례는 16대 대통령 선거운동에서 불법 선거자금 모금과 관련해서 두 정당(새천년민주당 vs. 한나라당)의 대응이다. 두 정당은 그들의 이미지 회복을 위한 위기대응 전략을 활용하였다. 본 연구는 위기대응메시지와 언론보도 메시지의 차이를 내용분석을 통해서 살펴보았다. 그 결과 특정 정당의 위기대응 메시지와 뉴스미디어는 차이를 보이지 않았으나, 다른 정당의 경우는 차이가 나타났다. 이러한 뉴스보도와 정당의 메시지 일치 여부는 공중의 위기평가에 중요한 영향을 미친다. 본 연구는 위기커뮤니케이션에서 조직의 위기대응 메시지와 뉴스미디어의 보도 차이의 중요성을 다뤘다는 점에서 의의를 갖는다. The purpose of this study is to explore a difference in crisis between media and parties. This research examined political crisis situation, crisis response, and media coverage using a case. Two main political parties in Korean faced the illegal fund raising case during the 16th presidential election. They used types of crisis response strategies for restoring or maintaining their reputation. This study found that a party’s crisis response was consistent with news media, but another party’s message was significantly different from news media. Such match or mismatch between a party and news media will influence on public evaluation toward a crisis response. This study has meaningful contribution in that the difference between an organizational crisis response message and news media coverage is significant.
Cho, Seungho,Jang, Ji-Wook,Hwang, Sekyu,Lee, Jae Sung,Kim, Sungjee American Chemical Society 2012 Langmuir Vol.28 No.50
<P>Gold nanoparticle (Au NP)–mixed metal oxide (MMO) nanocomposite photocatalysts for efficient self-sensitized dye degradations under visible light were prepared by an electrostatically driven self-assembly. Dihydrolipoic acid (DHLA)-capped Au NPs (building block I) were synthesized through a room temperature reaction. Their hydrodynamic size was determined as being around 4.9 nm by dynamic light scattering measurements. MMO nanoplates with lateral dimensions of 100–250 nm (building block II) were prepared by a calcination of zinc aluminum layered double hydroxides at 750 °C for 2 h in air. In a pH 7.0 aqueous solution, the DHLA-capped Au NPs had a negative zeta potential (−22 ± 3 mV); on the other hand, the MMO nanoplates had a positive zeta potential (15 ± 2 mV). Electrostatic self-assembly was achieved by stirring an aqueous solution (pH 7.0) containing DHLA-capped Au NPs and MMO nanoplates at room temperature for 1 h. The self-assembled and sequentially calcined nanocomposites exhibited the superior self-sensitized dye degradation efficiency under visible light to that of ZnO, TiO<SUB>2</SUB> (P25), or pure MMO nanoplates. The enhanced degradation efficiency could be attributed to strong coupling interactions of ZnO and ZnAl<SUB>2</SUB>O<SUB>4</SUB> phases of the MMO and the role of Au as an electron sink and mediator for formations of reactive oxidation species and as a light concentrator.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2012/langd5.2012.28.issue-50/la304303h/production/images/medium/la-2012-04303h_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la304303h'>ACS Electronic Supporting Info</A></P>
Formation of quasi-single crystalline porous ZnO nanostructures with a single large cavity
Cho, Seungho,Kim, Semi,Jung, Dae-Won,Lee, Kun-Hong Royal Society of Chemistry 2011 Nanoscale Vol.3 No.9
<P>We report a method for synthesizing quasi-single crystalline porous ZnO nanostructures containing a single large cavity. The microwave-assisted route consists of a short (about 2 min) temperature ramping stage (from room temperature to 120 °C) and a stage in which the temperature is maintained at 120 °C for 2 h. The structures produced by this route were 200–480 nm in diameter. The morphological yields of this method were very high. The temperature- and time-dependent evolution of the synthesized powders and the effects of an additive, vitamin C, were studied. Spherical amorphous/polycrystalline structures (70–170 nm in diameter), which appeared transitorily, may play a key role in the formation of the single crystalline porous hollow ZnO nanostructures. Studies and characterization of the nanostructures suggested a possible mechanism for formation of the quasi-single crystalline porous ZnO nanostructures with an interior space.</P> <P>Graphic Abstract</P><P>We report a method for synthesizing single crystalline porous ZnO nanostructures containing a single large cavity. Transitory spherical amorphous/polycrystalline particles may play a key role in the formation of these nanostructures. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1nr10609k'> </P>
The Interaction between Personality Characteristics and Mood States in Media Contents Selection
Cho, Seungho,Hur, Junsoo The Korea Contents Association 2018 International Journal of Contents Vol.14 No.4
This study was conducted to explore the relationship between personality characteristics and mood in the selection of media content. Using meta-analysis, this study analyzed past studies regarding media content selection in television program. The results of this research showed that the preference of a given media content would depend on the viewer's mood, personality characteristics and the interaction between personality characteristics and mood states. The secondary data of television programs supported the association.
Cho, Seungho,Kim, Hye-Jin,Lee, Kun-Hong Royal Society of Chemistry 2009 Chemical communications Vol.2009 No.40
<P>We report a novel method for covering a substrate with highly-oriented single crystalline hexagonal zinc structures under atmospheric pressure and room temperature without an external source of electric current, any templates or the use of epitaxial growth on the substrate.</P> <P>Graphic Abstract</P><P>We report a novel method for covering a substrate with highly-oriented single crystalline hexagonal zinc structures under atmospheric pressure and room temperature without an external source of electric current, any templates or the use of epitaxial growth on the substrate. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b911773c'> </P>