• 한국환경과학회지
• /
• 제22권11호
• /
• pp.1443-1449
• /
• 2013

This was an experimental study to evaluate temperature reduction and evapotranspiration of extensive green roof. Three test cells with a dimension of $1.2(W){\times}1.2(D){\times}1.0(H)$ meters were built using 4-inch concrete blocks. Ten-centimeter concrete slab was installed on top of each cell. The first cell was control cell with no green roof installed. The second and third cells were covered with medium-leaf type Zoysiagrass (Zoysia japonica) above a layer of soil. Soil thickness on the second cell was 10cm and that on the third cell was 20cm. Air temperature, relative humidity and solar irradiance were measured using AWS (automatic weather system). Temperature on top surface and ceiling of the control cell and temperature on top surface, below soil and ceiling of green roof cells was measured. Evapotranspiration of the green roof cells were measured using weight changes. Compared with temperature difference on the control cell, temperature difference was greater on green roof cells. Between two green roof cells, the temperature difference was greater on the third cell with a thicker soil layer. Temperature differences below soil and on ceilings of green roof cells were found greater than those of the control cell. Between the green roof cells, there was no difference in the temperature reduction effects below soil and on ceilings based on substrate depth. In summary, green roof was found effective in temperature reduction due to evapotranspiration and shading effect.

• 한국지반신소재학회논문집
• /
• 제16권4호
• /
• pp.67-74
• /
• 2017

지반 공동 발생으로 인한 지반함몰 사고를 미연에 방지하기 위해서는 발생된 공동 주변 지반의 이완영역에 대한 역학적 특성 평가와 더불어 이에 상응하는 적합한 보강 대책을 신속히 수립하는 것이 필요하다. 본 논문에서는 지중 공동 주변의 이완영역 발생에 대한 메커니즘 분석을 위해 유한요소 수치해석을 실시하였다. 수치해석에서는 지중 공동과 이완영역을 모사하기 위해 강제변위법을 적용하였으며, 수치해석 결과는 실내모형실험을 수행한 기존 연구 결과를 이용하여 검증하였다. 유한요소 수치해석 결과로부터 토사 유실로 인한 공동 주변 지반의 간극비 분포 특성을 파악하였으며, 전단응력 감소 특성을 분석하여 이완영역의 범위를 정량적으로 제시하였다.

• 한국지반신소재학회논문집
• /
• 제14권4호
• /
• pp.159-165
• /
• 2015

본 연구에서는 제주도 내에서 발생되는 현무암 석분슬러지를 차수용 재료로 재활용하기 위하여 현무암 석분슬러지, 시멘트 및 모래 혹은 플라이애쉬(fly ash)를 교반하여 각 혼합비별 투수계수를 측정하였다. 측정결과 플라이애쉬가 포함된 시멘트 혼합체의 경우 플라이애쉬의 함량이 증가함에 따라 시멘트 혼합체의 투수계수는 증가하며, 시멘트 혼합체를 차수재로 활용하기 위해서는 플라이애쉬 함량이 약 8%이하로 적용되어야 한다. 한편 모래가 포함된 시멘트 혼합체의 경우 모래의 함량이 증가함에 따라 시멘트 혼합체의 투수계수는 증가하며, 시멘트 혼합체를 차수재로 활용하기 위해서는 모래의 함량이 약 40%이하로 적용되어야 한다. 플라이애쉬 혹은 모래가 혼합된 석분슬러지 시멘트 혼합체를 서로 비교한 결과 차수재로 재활용하기 위해서는 플라이애쉬를 혼합하는 것 보다는 모래를 혼합하는 것이 더 유리함을 알 수 있다.

• Journal of Forest and Environmental Science
• /
• 제36권1호
• /
• pp.47-54
• /
• 2020

A "Scenic Site" is an official heritage category legally defined as a "scenic site of outstanding artistic value with excellent scenic views." However, the subjective interpretation of the term causes several problems. This study suggested a systematic, organized process of designating a listed area as a scenic site after careful and detailed quantitative and qualitative analysis. Indicators were identified for each of the two analyses, and then scored and weighted. Quantitative indicators were distributed within 5 points for each indicator. Water, which is a natural indicator, based on distance from river boundaries. Forest landscapes were assigned in consideration of forest physiognomy and age class. Land use was allocated in consideration of land cover type and, in case of development site, '-' score was assigned. Cultural heritage conservation area, which is historical and cultural indicator, was distributed by distance within a maximum of 500 meters. Visibility, an indicator of landscape value, was assigned according to the frequency of visibility. The weight of each indicator was calculated by considering the value of each item. The weight of distribution of cultural resources is relatively high, while other items were set the same. In case of land use, however, '-' score was given according to the grade. Qualitative indicators, on the other hand, were considered terrain, landscape zone, ownership, intellectual boundary, and land category. The applicability of the proposed process and method was examined by applying the existing methods and criteria used for designating scenic spots. Opinions of subject-matter experts were incorporated in the identification of the indicators and in the result review stage. In the future, it is necessary to apply this method while designating scenic sites so as to establish an objective, scientific designation process.

• 한국주거학회논문집
• /
• 제26권1호
• /
• pp.1-10
• /
• 2015

In line with the recent public concern on the environmental issues in building industry, there has been a rise in demand for a healthy, sustainable housing environment in South Korea. In order to achieve a healthy environment in residential buildings, considerable efforts have been made in a wide range of sectors. Among others, the development of the certification schemes to promote environment-friendly planning and building construction is remarkable. In urban South Korea, recently built houses tend to be significantly high-rise, high-density buildings. Global warming has brought about drastic climate change and continued to increase the average annual temperature year by year. These changes should be well reflected on the government's implementation of the building environmental assessment system. For guidance, therefore, this study looks to the case of Hong Kong which is well known for high-density housing development and subtropical climate conditions. It compares the features of the green building certification schemes for newly developed multifamily housing in two regions, namely HK-BEAM in Hong Kong and G-SEED in South Korea. Based on the findings, it argues that the G-SEED implementor should have expanded roles in providing training programs and follow-up services in collaboration with the certification authorities. It is also argued that G-SEED professionals should be involved in the early stages of design processes, and training programs and licence systems to produce green building professionals should be developed. Finally, it points out that the assessment indicators should be more detailed and diversified.

• 한국지반공학회논문집
• /
• 제29권12호
• /
• pp.69-75
• /
• 2013

지하 매설관은 우리의 일상생활과 매우 밀접하지만 일반적으로 붕괴로 인한 피해가 발생하기 전에는 그 중요성에 둔감한 편이다. 대부분의 매설관은 도로포장체 아래에 매설되어 있어 외부하중으로는 주로 교통하중을 받는다. 본 연구에서는 이러한 교통하중을 받는 지하 매설관의 거동에 대해 살펴보았다. 지하 매설관의 거동에 영향을 미치는 인자는 여러 가지가 있지만, 본 연구에서는 매설 깊이(H)와 매설관의 직경(D)의 비를 가장 중요한 인자로 보고 연구를 수행하였다. 두 가지 경우의 매설 깊이에 대한 매설관 직경 비에 따른 매설관의 건전성을 살펴보았다. 결과를 바탕으로 매설관의 건전성을 확보할 수 있는 매설깊이를 결정할 수 있었으며, 보다 경계적인 매설관 설계를 할 수 있을 것으로 기대된다.

• 한국환경과학회지
• /
• 제29권6호
• /
• pp.683-689
• /
• 2020

According to a NASA Goddard Institute for Space Studies report, temperatures have risen by approximately 1℃ so far, based on temperatures recorded in 1880. The 2003 heatwave in Europe affected approximately 35,000 people across Europe. In this study, a cooling fog, which is used in smart cities, was designed to efficiently reduce the temperature during a heatwave and its pilot test results were interpreted. A model experiment of the cooling fog was conducted using a chamber, in which nano mist spray instruments and spray nozzles were installed. The designed cooling fog chamber model showed a temperature reduction of up to 13.8℃ for artificial pavement and up to 8.0℃ for green surfaces. However, this model was limited by constant wind speed in the experiment. Moreover, if the cooling fog is used when the wind speed is more than 3m/s in the active green zone, the temperature reduction felt by humans is expected to be even greater. As a second study, the effect of cooling fog on temperature reduction was analyzed by installing a pilot test inside the Land Housing Institute (LHI). The data gathered in this research can be useful for the study of heat reduction techniques in urban areas.

• 한국물환경학회지
• /
• 제32권6호
• /
• pp.562-569
• /
• 2016

Recently, Low Impact Development (LID) is being used in Korea to control urban runoff and nonpoint source pollution. In this study, we evaluated the reduction of surface runoff from a study area, as the effect of connecting three bioretention as LID-BMP. Surface runoff and storage volume of bioretention is estimated by the Curve Number (CN) method. In this study, the storage volume of bioretention is divided by the volume of surface runoff and precipitation which directly enters the bioretention. The ratio of captured surface runoff volume to storage volume is highly influenced by the ratio of drainage area to surface area of bioretention. The high bioretention surface area-to-drainage area ratio captures more surface runoff. The ratio of 1.2 captures 51~54% of the total surface runoff, ranging from 5-30cm of bioretention depth; a ratio of 6.2 captures 81~85%. Three connected bioretentions could therefore captures much more runoff volume, ranging from $35.8{\sim}167.3m^3$, as compared to three disconnected bioretentions at their maximum amount of precipitation with non-effluent from the connecting three bioretentions. Hence, connecting LID-BMPs could improve the removal efficiencies of surface runoff volume and nonpoint source pollution.

• 한국지역사회생활과학회지
• /
• 제23권1호
• /
• pp.17-30
• /
• 2012

This study is targeted on children's parks in Seogu, Daejeon with the goal of maximizing the usage and versatility of existing parks in the area by the survey and analysis of the general status of children's parks, land use near the parks, population, users, and traits of usage. For the purposes of this thesis this study has selected 65 of the children's parks in the Seogu District to monitor. It also focused on a number of these parks located in areas which underwent a lot of changes and needed an increase in usage and versatility. Based on the selection criteria, the four target parks, Wojeong, Meongwhack, Dosan and Wicdunjimi children's park were selected. The Survey shows that 55.9% of park visitors visited a park to 'rest and take a walk' and used 'main facilities' meaning resting facilities like pergola and benches. In the nighttime, the number of park visitors is so few because of safety problems. 50% of users were satisfied with parks. It shows that there are many respondents who want to recompose these parks as places for light exercise, resting, meeting, and as community symbols. Generally, these target parks don't reach their full potential and they also do not play their proper roles because they are hampered by the constriction of the law. These stick to an outdated idea of what a park should be like without considering the actual and practical needs of city dwellers. When it comes to the remodeling and refurbishing of these parks we have to rethink the planning process so that these parks may be more versatile and practical in order to accommodate the radical changes of users and patterns of usage.

• 한국건설순환자원학회논문집
• /
• 제7권2호
• /
• pp.78-83
• /
• 2012

터널현장의 숏크리트 시공에 사용되는 강섬유 보강 숏크리트는 강섬유의 강성이 크고 중량이 무거워 숏크리트 시공상 어려움이 있으며, 강섬유의 부식과 높은 반발률 등이 개선사항으로 요구되고 있다. 이에 본 연구에서는 강섬유 보강 숏크리트의 단점을 개선하기 위하여 폴리아미드섬유를 혼입한 숏크리트를 제안하고, 현장 적용성 평가를 위하여 시험시공 결과를 제시하였으며, 그 결과 다음과 같은 결론을 얻었다. 1) 폴리아미드섬유 보강 숏크리트의 역학적 성능은 국내의 터널관련 설계기준을 만족하며, 기존 강섬유 보강 숏크리트와 동등 수준의 역학적 성능을 나타내었다. 2) 폴리아미드섬유 보강 숏크리트는 강섬유 보강 숏크리트에 비해 시공시 반발률이 저감되어 시공성 뿐만 아니라 경제성, 품질, 친환경성 측면에서 우수한 숏크리트라 할 수 있다.