• Proceedings of the Korean Institute of Landscape Architecture Conference
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• 2015.03a
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• pp.44-45
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• 2015

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.7
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• pp.475-486
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• 2020

The purpose of present study is to identify the regional tourism resources using Webometric network analysis. The study focuses on Suseong area in Daegu metropolitan city. Various kinds of web-based data, for example, hit counts, online news, and public comments, were used to discover hot places and people's responses. The research question is, 'First, what is the optimum level of the search engine for suseong? Second, what is the online appearance of tourist resources in suseong? Which region is the center of tourism with high levels of emergence? Third, what are the main contents of news articles and comments related to the Suseong pond?'. The results show that the search engine optimization level in Suseong is lower than that in other areas in Daegu. In other words, tourism information and contents regarding Suseong are not highly visible on cyber space. Importantly, Suseong pond had the highest online presence. A close analysis of both online news and users' comments on Suseong pond, however, revealed the biggest concern as calling for improving public accessibility to tourism infrastructure. The findings are expected to contribute to policy development and service operation related to tourism resources in Suseong.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.544-544
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• 2017

국민경제가 성장하고 여가시간이 늘어남에 따라 도심지내 수변공간은 도시의 시민들이 일상적으로 이용하는 공간으로 개발이 증가되고 있다. 또한 봉하 내성천의 은어축제등과 같이 지역의 축제 등이 진행되는 공간으로 이용되고 있다. 이러한 친수적 목적의 수변공간의 이용은 갈수록 증가되고 있으며 이용하는 시민들의 요구도 다양화되고 있다, 현재의 수변공간은 대부분 운동, 산책 등을 할 수 있는 공간으로 활용되고 있으나, 다양한 요구에 맞추어 개발이 진행되고 있다. 본 연구에서는 현재 활용되고 있는 수변공간을 이용하는 이용자들을 대상으로 이용자들의 현황, 만족도, 요구사항 등을 설문조사하였다. 유형별로는 도심지내 하천공간인 대구의 신천과 서울의 청계천 그리고 주변의 상권과 연계되어 활용되는 대구의 수성못, 축제공간으로 활용되는 봉화의 내성천에 대해 설문조사한 것을 분석하였다. 설문조사내용으로는 이동거리, 이용시간, 연령대, 선호시설, 요구사항 등에 대해 조사하였다. 이러한 수변공간 이용자들을 대상으로 조사한 내용은 향후 시민들의 이용을 증대시킬수 있는 방향으로의 수변공간 조성에 지표로 이용될 수 있을 것으로 판단된다.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.506-506
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• 2016

수변공간을 개발하는 방향에 있어서 홍수에 안전하고 수자원의 이용기술이 발달하면서 수자원 안전성이 크게 향상되어 수변공간개발은 이용성을 증가시키는 방향으로 진행되고 있다. 대표적인 수변공간 개발인 청계천은 이제 많은 사람들이 방문하고 여가를 즐기고 휴식을 취하는 공간으로 전국적으로 유명한 관광명소가 되었다. 청계천과 같이 유명한 수변공간이 아니더라도 지역의 주거지와 가까운 곳에 하천과 수변공간들이 이미 많은 사람들이 운동, 산책, 휴식, 여가활동을 즐기는 공간으로 인간에게 다가오고 있다. 이러한 수변공간을 개발하는 데 있어 지금까지 개발의 방향을 결정하는 주체는 지자체의 담당공무원과 기술자들에 의해 개발의 방향이 결정되어 왔다. 최근들어 이수와 치수에 있어 안정성이 과거보다 크게 상향되면서 하천은 인간에게 친숙한 공간이 되고 있다. 시대의 흐름이 수변공간의 활용이 높아지고 과거와 달리 홍수방어나 수자원을 공급하는 자연 시설이 아닌 인간이 다양한 목적으로 이용이 가능한 공간으로 변해가고 있다. 이러한 공간을 개발하는데 있어 지형적, 사회문화적 특성을 반영시키고 이용도를 증진시키기 위해 이용자들의 성향을 파악하고 객관적인 지표를 개발할 필요가 있다. 본 연구에서는 대구에 위치한 대표적인 수변공간인 수성못과 신천 그리고 팔거천을 대상으로 이용자들의 설문조사를 실시하고 그 결과를 이용하여 수변공간을 개발하는 데 있어 정량적인 지표들을 제시하고자 한다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2019.10a
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• pp.157-157
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• 2019

• Journal of the Korea Institute of Building Construction
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• v.15 no.6
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• pp.607-614
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• 2015

Generally surface finishing of building is done with water paint that performs basic water repellency and resisting. When painting the exterior of the building with water paint, application method is easy and inexpensive and it has the advantage of building maintenance. But surface finishing of water paint is easy to discolored or aging due to ultraviolet light so the effect is not satisfying than expected. Therefore this study is to analyze durability of water-repellent paints mixed with water-repellents as outer surface finishing materials, and evaluate its feasibility. Color change and color different due to the accelerated time were tested, and the feasibility was evaluated based on the test results. The experimental results of color different, brightness different and chromaticity suggested that water-repellent paints mixed with water-repellents were suitable for finishing materials. Considering overall general durability performances, stable mixing ratios were 2, 5, and 8%.

• Journal of the Korean Recycled Construction Resources Institute
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• v.2 no.2
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• pp.107-114
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• 2014

The objective of this study is to evaluate the strength development of blast furnace slag concrete in response to the use of recycled aggregate as alkali activator. The influence of the amount of recycled aggregate was evaluated depending on different ratios of replacement for each RFA and RCA to NFA and NCA, respectively. The results indicated that as replacement of RFA and RCA increased, their strength exhibited to be increased. This was due to the fact that the latent hydraulic properties of blast furnace slag was activated by the alkali in recycled aggregates. However, in case of 365-days, it showed lower compressive strength than using NA(natural aggregates) which could be explained as the exhaustively use of alkali containing in RA. The specimens using RA showed about 90% of compressive strength comparing with specimens using NA.

• Journal of the Korean Institute of Gas
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• v.23 no.4
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• pp.65-73
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• 2019

A spiral steel pipe has been more used widely as a structural member as well as transport pipeline because the pipe can be manufactured continuously, consequently more economical than the conventional UOE pipe. As improved pipe manufacture technology makes spiral pipes to have high strength and to have larger diameters, the spiral pipes have been recently used as long distance transport pipeline with a large diameter and strain-based design is thus required to keep structural integrity and cost effectiveness of the spiral pipe. However, design codes of spiral pipe have not been completely established yet, and structural behaviors of a spiral pipe are not clearly understood for strain-based design. In this paper, the effects of residual stresses due to the spiral pipe manufacture process are investigated on the flexural behavior of the spiral pipe. Finite element analyses were conducted to estimate residual stresses due to the manufacturing process for the pipes which have different forming angle, thickness, and strength, respectively. After that, the results were used as initial conditions for flexural analysis of the pipe to numerically investigate its flexural behaviors.

• International Journal of Highway Engineering
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• v.13 no.3
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• pp.39-49
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• 2011

The porous pavement system is widely considered very effective in urban street because of its various benefits on safety and environment, but the pavement thickness design system has not been established yet. In porous pavement system. rainwater penetrates to the subgrade through porous pavements layers. Porous pavements are expected to reduce or alleviate the problems caused by impermeable pavement layer such as flood damage due to heavy rain in the city, drainage load, disorder in ecosystem, and heat island. However, its structural design methods in traffic roads has not been made mainly because of not being able to consider adequately the effect of rainwater on subgrade strength. In this study, structural design method of porous pavements is suggested after considering the subgrade weakness due to rainwater and numerical mechanical analysis. It is noted that elastic modulus of subgrade is reduced by 20% as subgrade moisture content is increased by 2% at optimum moisture content in the literature review. As a result of both finite element analysis and strength loss of subgrade by the existing design method, it is necessary to increase subbase thickness about 30cm in porous pavements compared with the existing traffic road pavement system. It is similar to premium thickness of structural design of porous pavements in Japan.

• Korean Journal of Soil Science and Fertilizer
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• v.45 no.2
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• pp.204-208
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• 2012

Water repellency which affects infiltration, evaporation, erosion and other water transfer mechanisms through soil has been observed under several natural conditions. Water repellency is thought to be caused by hydrophobic organic compounds, which are present as coatings on soil particles or as an interstitial matter between soil particles. This study was conducted to evaluate the characteristics of the water repellent soil and transport characteristics of trace elements within this soil. Capillary height of the water repellent soil was measured. Batch and column studies were accompanied to identify sorption and transport mechanism of trace elements such as $Cu^{2+}$, $Mn^{2+}$, $Fe^{2+}$, $Zn^{2+}$ and $Mo^{5+}$. Difference of sorption capacity between common and repellent soils was observed depended on the degree of repellency. In the column study, the desorption of trace elements and the spatial concentration distribution as a function of time were evaluated. The capillary height was in the repellency order of 0% > 15% > 40% > 70% > 100%. No water was absorbed in soil indicating >70% repellency. Using trace elements, $Fe^{2+}$ and $Mo^{5+}$ showed higher sorption capacity in the repellent soil than in non-repellent soil. The sorption performance of $Fe^{2+}$ was found to be in the repellency order of 40% > 15% > 0%. Our results found that transfer of $Mo^{5+}$ had similar sorption tendency in soils having 0%, 15% and 40% repellency at the beginning, however, the higher desorption capacity was observed as time passes in the repellent soil compared to in non-repellent soils.