• 한국조경학회지
• /
• 제15권3호
• /
• pp.21-31
• /
• 1988

This study was executed to investigate the vegetation structure and to propose the administration planning of the Royal Ancestor's Shrine. Five sites sampled in the study area with the clumped sampling method. Pinus koraiensis community covered 27.3% and Quercus aliena community 61.5% of total forest area when considering the actual vegetation. This area of environmental impact grade 3 and 4 area covered 46.9% and it should be restored. The ecological diversity, i.e. species diversity and evenness, showed low class, and especially site 2 which was controlled the user's after 1985 showed the lowest value. Pinus koraiensis community which is a dominant species now in the study area shall be succeed to Quercus aliena community. Robinia pseudoacacia at the eastern wall shall be excluded step by step and it shall be replaced with native species gradually. Ailanthus altissima, Populus ${\times}$ albaglandulosa and Styrax japonica which had higher selection invaded conspicuously the bare land. As the administration planning of the study area, Pinus koraiensis and Styrax japonica shall be thinned out gradually and it shall be replaced with Quercus aliena and Acer palmatum.

• 한국산학기술학회논문지
• /
• 제20권1호
• /
• pp.409-418
• /
• 2019

최근 기후 변화에 의한 집중호우는 산지에서 토석류를 발생시켜 많은 피해를 양산하고 있다. 연구의 목적은 토석류 발생 가능성이 높은 산지에 사방댐을 설치하였을 경우, 사방댐의 설치 위치에 따라 공급유량의 변화에 대하여 사방댐이 받는 충격력을 평가한 것이다. 연구방법으로는 수치해석모델을 이용하였고, 수치해석 모델은 침식과 퇴적 모델을 이용하여 유한차분법을 적용하였으며, 사방댐에 영향을 주는 토석류의 충격력은 유체의 연속성을 고려하여, 질량보존법칙과 운동량 보존 법칙을 만족하는 지배 방정식을 이용하였다. 수치모의를 한 결과 토석류는 도달 초기에 충격력의 Peak가 발생하였으며, 16sec~19sec 구간에서도 토석류의 Peak가 발생하였고, 공급유량을 증가시킨 경우 이 구간에서 여러 개의 토석류 충격력의 Peak가 발생하였다. 이는 공급유량의 증대로 인해 토석류의 유하 속도를 증가시키고, 증가된 속도는 물 입자와 토사의 충돌로 인해 에너지가 증대되고 있음을 보여준다. 따라서, 산지에 연속적으로 여러 기의 사방댐을 설치하려고 할 때 각 위치에서 사방댐이 받는 충격력을 조사할 필요가 있다. 본 연구의 결과는 비탈 경사면에서 토석류 제어를 목적으로 설치되는 구조물이 받는 충격력과 사면에서 사방댐의 적정 위치를 설정하는 데 좋은 정보를 제공할 것이다.

• 대한원격탐사학회지
• /
• 제32권1호
• /
• pp.39-48
• /
• 2016

Yangon Mega City is densely populated and most urbanization area of Myanmar. Rapid urbanization is the main causes of Land Use and Land Cover (LULC) change and they impact on Land Surface Temperature (LST). The objectives of this study were to investigate on the LST with respect to LULC of Yangon Mega City. For this research, Landsat satellite images of 1996, 2006 and 2014 of Yangon Area were used. Supervised classification with the region of interest and calculated change detection. Ground check points used 348 points for accuracy assessment. The overall accuracy indicated 89.94 percent. The result of this paper, the vegetation area decreased from $1061.08sq\;km^2$ (24.5%) in 1996 to $483.53sq\;km^2$ (11.2%) in 2014 and built up area clearly increased from $485.33sq\;km^2$ (11.2%) in 1996 to $1435.72sq\;km^2$ (33.1%) in 2014. Although the land surface temperature was higher in built up area and bare land, lower value in cultivated land, vegetation and water area. The results of the image processing pointed out that land surface temperature increased from $23^{\circ}C$, $26^{\circ}C$ and $27^{\circ}C$ to $36^{\circ}C$, $42^{\circ}C$ and $43.3^{\circ}C$ for three periods. The findings of this paper revealed a notable changes of land use and land cover and land surface temperature for the future heat management of sustainable urban planning for Yangon Mega city. The relationship of regression experienced between LULC and LST can be found gradually stronger from 0.8323 in 1996, 0.8929 in 2006 and 0.9424 in 2014 respectively.

• 한국대기환경학회지
• /
• 제9권2호
• /
• pp.132-139
• /
• 1993

TCM has been used for many environmental impact assessments and many case studies in Korea. TCM was applied to urbvan areas and rolling terrains. But original TCM was developed for rural area, and this model could not reflect the characteristcs of these study sites. This paper analyzed the characteristics of TCM, and modified the algorithm of area source, and modified the vertical wind speed profile exponents and diffusion parameter to make it applicable in urban area. In the process of modification, an important error in area source calculation of original TCM program was found. So that was corrected as follows. $$ Before modification $QC = 0.79788456^*(0.5^*GRID)^**BA/(U(IA, IRUN)^*AA^*BA TCM09310$ After modification $QC = 0.79788456^*(500^*GRID)^**BA/(U(IA, IRUN)^*AA*BA) modified$ $$ Then original TCM and modified TCM-urban mode were compared, and it was found that predicted mean value by original TCM was 7 times higher than observed mean value. But mean value by modified TCM-urban mode was very similar to observed value.

• 웰빙융합연구
• /
• 제7권4호
• /
• pp.29-37
• /
• 2024

Purpose: This study aims to understand the types and amounts of greenhouse gases among substances generated when operating facilities at resource recovery facilities in Seoul and analyze their impact on the environment. Research design, data and methodology: As a research method, you can directly visit four resource recovery facilities in Seoul, investigate greenhouse gases generated when operating the facilities, and then understand the distribution of generation through the greenhouse gas calculation formula. In addition, the impact, distribution, etc. that they have regionally can be confirmed by comparing the emission source and the surrounding site boundary line through the environmental impact survey report Results: When operating resource recovery facilities, you can determine whether there is a possibility that they will actually affect the surrounding areas, especially in areas where humans reside, such as private homes and vulnerable facilities, and if so, the results can be determined. The goal of this study is to understand how much the effects of greenhouse gases contribute to climate change and what the effects are on the human body. Conclusions: he results of this study can identify the causes of negative images of the survival of resource recovery facilities and the expansion and establishment of new resource recovery facilities, and suggest eco-friendly measures such as waste export, recycling, and recycling instead of new construction on the impact on climate change.

• 국제학술발표논문집
• /
• The 1th International Conference on Construction Engineering and Project Management
• /
• pp.758-763
• /
• 2005

For international projects in general and the projects in the Gulf area in Particular, the most common cause of construction disputes and claims is construction delay. This paper will present different surveys to identify the causes of delay, the parties responsible, and how delay can be avoided. This paper will outline how these factors impact damage assessment and entitlement. Furthermore, a case study will be presented to show how the responsibility and damages due to delay are assessed and how entitlements are calculated.

• Elastomers and Composites
• /
• 제49권4호
• /
• pp.284-292
• /
• 2014

고분자 소재는 금속 소재에 비해 기계적 강도, 특히 충격강도가 매우 취약하기 때문에 이의 증대를 위해 충격보강제를 이용하는 경우가 많다. 이러한 충격강도는 충격보강제의 함량과 분포에 따라 변화한다. 본 연구에서는 충격보강제가 함유된 나일론 6 시편에 대해서 충격시험을 모사하였고 충격시편 단면에서의 응력분포를 통해 충격강도 증대원리를 관찰하였다. 시편 단면에서 충격보강제의 개수와 분포에 따른 해석을 하여 비교하였다. 충격보강제의 개수가 증가할수록 부피가 감소하는 모델의 경우 놋치 표면의 응력과 주응력의 크기가 점차 높게 나타났다. 충격보강제의 개수가 증가할수록 충격보강제 전체의 총 표면적이 증가하는 모델의 경우에는 응력과 주응력이 점차 높게 관찰되었다.

• Composites Research
• /
• 제20권4호
• /
• pp.42-50
• /
• 2007

본 논문에서는 바이모달 트램의 차체와 바닥재 구조 재료로 적용되는 2종류의 샌드위치 패널에 대한 충격 손상을 시험과 수치해석을 통해 상호 비교하였다. 적용된 시편은 $100mm{\times}100mm$의 크기를 가지며 저속충격시험기를 사용하여 4가지 경우의 충격에너지에 대해 시험하였다. 또한, 저속충격 조건에 따라 차체 적용 샌드위치 구조물의 저속 충격 특성을 유한요소해석으로 분석하기 위해 범용 외연유한요소해석 프로그램인 LS-DYNA3D를 이용하여 특성을 분석하였다. 이때 금속재와 복합재 재료의 손상모델, 그리고 직교이방성 특성을 갖는 하니컴 재료의 유효손상모델을 제시하기 위하여 기계적 특성 시험을 수행하여 물성 파라메터를 획득하였고, 시험과 해석결과 충격 하중에 대한 샌드위치 패널의 손상 영역과 깊이를 비교적 잘 예측할 수 있음을 증명하였다.

• 환경영향평가
• /
• 제22권5호
• /
• pp.491-511
• /
• 2013

In this study, three survey areas in Changnyeong, Miryang and Jinju of the confirmed the habitation of nutria and carried out the performance on the plant diet resource. From the habitat trace survey in the nutria habitat, a total of 336 trace points was shown. There were 181 trace points (54%) confirmed from St. 1 as the highest showing, followed by 52 trace points (15.4%) from St. 2, and 103 trace points (30.6)% from St. 3. The vascular plants distributed in the habitat area were a total of 182 taxonomic group with 57 families, 99 genus, 16 hybrids, and 1 race. The vascular plant living types in the habitat area are 1-year plant (Th, Th(w)) for 63class groups (34.6%), hemicryptophyte (H) for 42class groups(23.1%). plants, trees, crop plants were included. As a result of analyzing the overseas research cases on the diet plants of nutria, there are 195 taxonomic groups in a total of 39 families, 126 genus, 183 breeds, and 12 hybrids. In the study areas, feeding the plants was confirmed by the 7 taxonomic groups, aquatic plant, terrestrial From the total of 182 taxonomic groups discovered in the habitat area, 20 class groups, in 3 habitation region, 10 class groups of commonly appearing 49 class groups were shown to be the breed confirmed for diet in existing case studies, and assuming from it basis, the nutria habitating in the survey area is considered to have the supply of diverse diet resource to have flawless habitation. This is implication of having potential breeding possibility.

• Ecology and Resilient Infrastructure
• /
• 제5권1호
• /
• pp.45-53
• /
• 2018

생태네트워크는 일반적으로 핵심지역, 완충지역, 코리더 등으로 구분될 수 있으며, 특히 핵심지역이나 생태적 코리더를 연결하기 위한 완충지역은 생태 네트워크의 지속성을 보호하고 외부로부터의 충격을 완충시키는 역할을 한다. 생태적 가치 및 보호적 가치가 높은 자원과 관련된 완충지역 설정에 대한 연구 및 관련법 등을 검토한 결과, 완충지역 설정에 대한 구체적인 연구가 더 필요한 것으로 생각된다. 본 연구에서는 국내외 완충지역을 설정하기 위한 기준을 제시한 다양한 분야의 사례를 조사하고, 철도환경영향평가 결과서 및 철도건설지침을 기준으로 철도개발지에 적용할 수 있는 활용방안을 분석하여 이를 평가하기 위한 항목으로 토지피복현황, 종다양성, 희귀성, 연계성을 제안하였다. 이를 통해 철도개발지 주변의 환경생태적 가치를 검토하여 철도 건설로 인한 환경 훼손 등 영향을 저감하고자 하였다.