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Thermolytic dehydrogenation of cotton-structured SiO2-Ammonia borane nanocomposite
Seunghun Shin,Joon-Hyung Jin,Jihoon Jung 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.88 No.-
Thermal dehydrogenation of ammonia borane (AB) is one of the simplest methods to generate purehydrogen for hydrogen power-driven proton exchange membrane fuel cells. For AB thermolysis, it isimperative to develop a highly effective catalyst to initiate the dehydrogenation reaction at a lowtemperature and eventually achieve enhanced hydrogen production. Here, we introduce a specificallydesigned AB-SiO2 nanocomposite, which is prepared by simple mixing and pressing processes. Hydrogenevolution during thermolysis of the cotton-structured AB-SiO2 composite is initiated at around 80 C, andthe maximum H2 yield is determined to be 11.2 wt% (2.32 mole equivalents of H2). The yield is found todepend on the size and size distribution of the catalytic SiO2 particles in the hydrogen fuel composite.
Role of Online Reviews in the Local Search Context
Seunghun Shin,Zheng Xiang,Florian Zach Smart Tourism Research Center 2023 Journal of smart tourism Vol.3 No.3
This research aims to understand the role of online reviews in the local search context by examining the effects of reviews on the representation of tourism businesses on local search platforms (LSPs). By simulating tourists' local searches for restaurants on three LSPs, namely Google, Bing, and Yelp, this study examines how different ranking results are generated across the platforms and how online reviews contribute to the differences. The findings suggest that online reviews are incorporated into LSPs as ranking factors and, thus, affect tourists' decision-making by influencing the information search results in the local search context. As one of the earliest studies on local search, this study discusses how the existing knowledge about the role of online reviews in tourists' decision-making needs to be reevaluated in mobile and more dynamic environments, and offers practical implications for tourism businesses' search engine marketing.
Shin, Seunghun,Hunter, William Cannon,Chung, Namho,Koo, Chulmo The Korea Society of Management Information System 2016 Asia Pacific Journal of Information Systems Vol.26 No.2
Almost all Koreans recognize the Dolhareubang as a representative symbol of Jeju. However, as the development of online technology progressed, the image and perception of the Dolhareubang is also expected to change. Thus, this study explored the perceived images of Dolhareubang by focusing on residents in Seoul, Korea using Q methodology. The goal of this research was to evaluate this iconic representation of Jeju as an important component of the island's online tourism destination image. The Q-set was developed from existing literature and defined conceptually in terms of 'value', 'resource', 'story', and 'image'. Thirty five respondents were recruited as P set. Findings indicated four distinctive clusters that perceived the Dolhareubang differently and differences in perceptions were observed in terms of age. The examination of destination image and the exploration of the perceptions of Dolharuebang as a representative of Jeju could contribute to online destination image management or development, which is a crucial component of smart tourism.