• Solar Energy
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• v.15 no.3
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• pp.141-149
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• 1995

The tungsten oxide thin films were prepared on $s_i$ wafer by using an electron-beam evaporation technique. Thickness and structure of tungsten oxide film degraded in various electrolytes were analyzed by Rutherford backscattering spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscope. Thickness of $WO_3$ film was the most dissolved in 1M $H_2SO_4$ electrolytye. We have confirmed that the degradation of this films was accelerated by $H_2O$ in electrolytes. But the electronic structure of film degraded by electrolyte contained of glycerol was not changed as comparision with as-deposited film. The degradation may be attributed to a change of thickness and the surface morphology of the film.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.11a
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• pp.439-455
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• 2017

최근 과학기술의 사회적 역할이 강조되며, 고령화 대응 과학기술에 대한 관심도 증대하고 있다. 특히, 고령화 관련 연구를 수행해온 기존의 과학기술영역은 현대 노인들의 요구를 충족시켜주기에 한계가 있는 등 새로운 과학기술의 발전방향성을 제시하기 위한 연구의 필요성이 증대하고 있다. 하지만 우리나라의 경우 고령화 대응 R&D를 총괄할 컨트롤 주체가 부재하며, 아직까지 관련 연구가 일부 영역에 편중되어 있다. 이에 본 연구는 WoS에서 제공하는 서지정보를 이용하여 키워드 네트워크분석을 수행함으로써, 고령화 대응 과학기술 분야의 지식구조를 국가별, 기간별 비교분석하였다. 분석결과, 최근 10년간의 연구동향이 직전 10년간의 연구동향과 비교하였을 때, 과학기술의 사회적 역할을 강조하고 있는 것으로 나타났다. 또한, 일본과 독일, 그리고 우리나라 연구동향을 비교분석한 결과, 우리나라의 경우 노인의 사회적 지위 및 삶의 질 등, 그리고 과학기술의 사회적 역할에 대한 연구가 상대적으로 늦게 나타났다. 위 분석결과를 토대로 향후 우리나라의 고령화 대응 과학기술 R&D 추진 방향에 대한 시사점을 제시하였다

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.28 no.6
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• pp.484-487
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• 2002

Leiomyoma is a benign smooth muscle tumor that usually arise in the uterus, skin and gastrointestinal system. Only 2 percent are located in the head and neck. Leiomyomas of oral cavity are uncommon as only two cases have been reported in the Korean literature. The common location of oral cavity has been tongue, but other sites include buccal mucosa, lips, palate. mouth floor, and gingiva. Our patient was 30 years old female who complained of swelling and discomfort in the mouth floor. Microscopically this tumor showed bundles of intertwining spindle cells within fibrous connective tissue stroma. The nuclei were generally pale staining and blunt ended. Masson's trichrome stain was positive for muscle, and immunohistochemical study for ${\alpha}$-smooth muscle actin revealed strong positivity. It was treated by surgical excision. We experienced a case of leiomyoma of oral cavity, so we report with literature reviews

• Journal of Microbiology and Biotechnology
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• v.24 no.3
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• pp.334-336
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• 2014

A new species named Aspergillus cumulatus sp. nov. is described in Aspergillus section Aspergillus (Eurotium state). The type strain (KACC $47316^T$) of this species was isolated from rice straw used in meju fermentations in Korea, and other strains were isolated from the air in a meju fermentation room. The species is characterized by growth at a wide range of water activities and the formation of aerial hyphae on malt extract 60% sucrose agar (ME60S) that resemble a cumulus cloud. Furthermore, A. cumulatus produces yellow ascomata containing small lenticular ascospores (5.1-5.7 ${\mu}m$) with a wide furrow, low equatorial crests, and tuberculate convex surface. The species is phylogenetically distinct from the other reported Aspergillus section Aspergillus species based on multilocus sequence typing using rDNA-ITS, ${\beta}$-tubulin, calmodulin, and RNA polymerase II genes.

• Economic and Environmental Geology
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• v.31 no.3
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• pp.223-233
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• 1998

The environments in the vicinity of the Dalseong mine has been much contaminated by heavy metals related to CuW ore deposit, which is of hydrothermal pipe type mineralized by quartz monzonite in the andesitic rocks. Chalcopyrite and wolframite are major ore minerals and sphalerite, galena and others are associated. To investigate the contamination of heavy metals in plants, samples of plants and soils were analysed by ICP for Fe, Mn, Cu, Pb, Zn, Ni, Co, Cd and Cr. Most of ore-related heavy metals are anomalously high in plants and soils, which were contaminated by the development of Taehan Tungsten Mining Company. The mine produced 48,704 tons (M/T) of 4 wt.% Cu and 1,620 tons (S/T) of 70 wt.% of $WO_3$ during active mining activity from 1961 to 1971 but was closed in 1975. Wild plants growing at the mine area may be used to remove heavy metals form soils, which cause contaminations of plants, stream waters and groundwaters in the vicinity of the mine.

• Korean Journal of Chemical Engineering
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• v.35 no.12
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• pp.2365-2378
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• 2018

We investigated the correlation between vanadium surface density and VOx structure species in the selective catalytic reduction of NOx by $NH_3$. The properties of the $VOx/TiO_2$ catalysts were investigated using physicochemical measurements, including BET, XRD, Raman spectroscopy, FE-TEM, UV-visible DRS, $NH_3-TPD$, $H_2-TPR$, $O_2-On/Off$. Catalysts were prepared using the wet impregnation method by supporting 1.0-3.0 wt% vanadium on $TiO_2$ thermally treated at various calcination temperatures. Through the above analysis, we found that VOx surface density was $3.4VOx/nm^2$, and the optimal V loading amounts were 2.0-2.5 wt% and the specific surface area was $65-80m^2/g$. In addition, it was confirmed that the optimal VOx surface density and formation of vanadium structure species correlated with the reaction activity depending on the V loading amounts and the specific surface area size.

• Journal of Smart Tourism
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• v.1 no.2
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• pp.3-12
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• 2021

The interaction between technology and tourism has been a dynamic research area recently. This study aims to review the progress and development of technology in tourism research via a bibliometric analysis. We derive the source data from the Web of Science (WoS) core collection and use CiteSpace for bibliometric analysis, including countries, institutions, authors, categories, references, and keywords. The analysis results are as follows: i) The number of published articles on the role of technology in tourism has increased in recent years. ii) Technology-related articles in tourism are abundant in Tourism Management, Journal of Travel Research, and Annals of Tourism Research. iii) The countries with the most contributions are China, the US, and the UK. The most active institutions are the Hong Kong Polytechnic University, University of Central Florida, Bournemouth University, University of Queensland, and Kyung Hee University. iv) The reference analysis results identify eight extensively researched topics from the most cited papers, and the keyword burst analysis results present an emerging trend. This study identifies the effect and development of technology in tourism research. Our findings provide implications for researchers about the current research focus of technology and the future research trend of technology in the tourism field.

• International Journal of Advanced Culture Technology
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• v.10 no.4
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• pp.453-459
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• 2022

This study attempted to explore the realization and research direction of a successful metaverse environment in the future by analyzing international research trends of the metaverse using topic modeling. A total of 208 papers among WoS and ScienceDirect papers using metaverse as keywords were selected, and quantitative frequency analysis and topic modeling were performed. As a result, it was confirmed that research has rapidly increased after 2022. The main keywords of the research topics were 'second', 'life', 'learning', 'reality', 'metaverse', 'virtual', 'blockchain', 'nft', 'medical', 'avatar', etc. The topic keywords 'Second life & Education' and 'Virtual Reality & Medical' accounted for a large proportion of 57%, followed by 'Blockchain & Cryptocurrency', 'Avatar & Interaction', and 'Sensing and Device'. As a result of semantic analysis, current metaverse research is focused on application and utilization, and research on underlying technologies and devices is also active. Therefore, it is necessary to identify the commonalities and differences between domestic and foreign studies, and to study the application method considering the domestic environment. In addition, new jurisprudence research is more necessary along with predicting new problems. It is expected that the results of study will provide the right research direction for domestic researchers in the era of digital transformation and contribute to the realization of a digital society.

• Korean Journal of Veterinary Service
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• v.45 no.4
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• pp.253-262
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• 2022

The applications of artificial intelligence (AI) can provide useful solutions to animal infectious diseases and their impact on humans. The advent of AI learning algorithms and recognition technologies is especially advantageous in applied studies, including the detection, analysis, impact assessment, simulation, and prediction of environmental impacts on malignant animal epidemics. To this end, this study specifically focused on environmental pollution and animal diseases. While the number of related studies is rapidly increasing, the research trends, evolution, and collaboration in this field are not yet well-established. We analyzed the bibliographic data of 1191 articles on AI applications to environmental pollution and animal diseases during the period of 2000~2019; these articles were collected from the Web of Science (WoS). The results revealed that PR China and the United States are the leaders in research production, impact, and collaboration. Finally, we provided research directions and practical implications for the incorporation of AI applications to address environmental impacts on animal diseases.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.07a
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• pp.219-222
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• 2020

웹툰 시장의 성장에 따라, 웹툰을 주제로 다양한 연구가 진행되고 있다. 그러나 웹툰의 댓글을 분석한 연구는 특정 웹툰에 한정된 연구가 많아 일반적인 웹툰 독자의 댓글 특징을 보기에는 한계가 있다. 또한 웹툰의 흥행과 관련하여, 흥행에 성공한 웹툰과 그렇지 못한 웹툰의 독자 반응을 파악하는 연구는 부족한 실정이다. 따라서 본 연구는 웹툰의 흥행에 주목하여, 흥행의 지표를 웹툰 플랫폼 정식연재로 판단하고, 정식연재가 된 웹툰과 되지 못한 웹툰의 댓글을 비교 분석하였다. 분석 결과, 정식연재가 된 웹툰은 긍정적인 감상평 외에 2차적 저작물을 언급하고 등장인물의 이름 언급이 높았으나 정식연재가 되지 못한 웹툰은 부정적인 감상평 외에, 웹툰 요소에 대한 부정적 언급과 웹툰 장르와 다른 장르의 언급이 나타나 웹툰에 대한 독자의 불만족 요인을 파악할 수 있었다.