• 한국농공학회지
• /
• 제40권1호
• /
• pp.49-56
• /
• 1998

Ths study was peformed to evaluate the degree of degradation and safety of a small agricultural reservoir, Kosam Reservoir, in Kyungki Province. Evaluation was done by the program developed by the authors. Results of the study are as follows: 1) Although many burrows were found in downstream side of embankment and cracks were found in wall joining spillway, it appeared that degree of degradation of embankment was in good conditions. 2) Compressive strengths of concrete of crest, side channel, chute floor of spillway were in poor condition. But it appeared that overall degree of degradation of structures was in medium condition based on the criteria of the evaluation system 3) From the analysis of slope stability, safety factor of downstream slope was over 3.3 for the worst condition, such as flood and high water level and that of upstream slope was also over 3.6 for rapid drawdown. In case of earthquake, safety factors were over 2.5 for all conditions. Therefore embankment slopes of Kosam Reservoir were very stable for normal and earthquake condition. 4) As upon assumed failure of embankment of Kosam Reservoir, degree of damage was estimated to be very serious because of many loss of life and properties in the downstream area. 5) Overall grade of safety of Kosam Reservoir was in good condition. Therefore safety was considered to be "No problems" at the present time but further degradation may be proceeded partly and continuously as time goes by.e goes by.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2006년도 춘계 학술발표회 논문집
• /
• pp.51-60
• /
• 2006

At new constructing national road, a cutting slope was surveyed and gotten face mapping for three months. The slope is composed of gray phyllite and coaly slate which is the Chang-ri Formation, Okcheon system. The slope angle is 40 degree and the direction is NNE. The attitude of schistosity is $260^{\circ}/45^{\circ}$. So the slope direction is nearly parallel to the schistosity. This is the reason that the slope is very unstable. On the other hand, the very unstable slope is caused by the direction of the schistosity and the slope. First month the coaly slate was slided through the schistosity plane about 10cm. However, three months late the displacement was 2m maximum.

• 한국조경학회지
• /
• 제21권1호
• /
• pp.13-30
• /
• 1993

The purpose of this study was to present data to the landscape planning and design through analyzing correlation between visual preference of users and nonusers and the landscape of hole in golf couses. Stimulus objects were selected from the 18 holes in Tae-gu Country Club. Preference value was judged through photo simulation by 35 subjects photographed at Tee and Interpoint (IPI, IP2), and classified into three landscape types and nine landscape components from photo analysis by researcher. For test of difference between groups toward each stimulus, t-test was used, and Duncantest, Correlation analysis for finding out correlation between preference degree and the landscape of each hole. The results of this study were as follows: As a result of analysis of preference value between groups for each hole, it has been shown that there was scarcely difference with each other. Form the relation between preference degree and spacial structure of hole, the holes making up a superior preference group have been shown that the greater part of the holes had a downward slope or a gentle slope mostly and then a visible ratio of fairway was high, and had diversified scenery by a lotus pond, a solitary planting tree, the roll of a fairway, facilities for convenience, etc. The holes making up a low-ranking preference group have been shown that the greater part of the holes had upward slope or a similar slope to it and had characteries of the bad condition of lawn, the nearby factories and odors, the monotonous scenery of a fairway, an unreasonable mixing of holes, etc. From the relation between preference degree and landscape components forming hole, it has been shown that the preference degree between users and nonusers had positive correlation to the occupied ratio of space of landscape components at Tee and Approach. At Tee, it has been shown that the preference degree of two groups were related with a lawn surface of fairway negatively, a lotus pond, a sky positively, and the preference degree of nonusers was related with iron-top for electric transmission positively. At Approach, it has been shown that the preference degree of two groups were related with iron-top for electric transmission negatively, and the preference degree of nonusers was related with a building positively. From the relation between preference degree group to each hole and the occupied ratio of space of landscape types, it has been shown that the constituent ratio of a high-ranking group was 1:2.4:2.2 and a low-ranking group was 1:4.1:5.1 among vertical type, horizontal type and background at Tee, but the constituent ratio of space of a high-ranking group was similar to a low-ranking group at Approach.

• 한국태양에너지학회 논문집
• /
• 제32권5호
• /
• pp.83-93
• /
• 2012

This study is to perform the effect of urbanization in urban and suburban districts, and to identify regional characters of climate according to the analysis of slope at rise, and descent of temperature and globe temperature, correlation between seasonal temperature analysis, and calculation of degree hour. According to this study, the result is summarized as follows. (1) The average temperature, rated from high to low, consists of residential area, Daegu weather station, intracity, green belt, water-front green belt, and suburban. (2) At the rise and descent of temperature, the result of the slope change of in each point may be one of the useful indexes to be able to perform the regional unique thermal characteristic, including the seasonal urbanization. (3) Although there is a difference between the surface of the earth and ambient environment. The result of the correlation of temperature between summer and winter is that temperature slope in urban districts was higher than in suburban districts, and the difference of slope was unvaried among the four observations in the same city region. (4) To show objectively, regional thermal characteristics in urban and suburban districts, the exponentiation of winter degree hour and summer degree hours were checked. The result of the exponentiation is that the more artificial a region, the lower index.

• 터널과지하공간
• /
• 제5권4호
• /
• pp.308-317
• /
• 1995

The stability study on the rock slope where have produced failures in Boryung dam site was evaluated using the streonet analysis techniques. SMR(Slope Mass Rating) approach which is suitable for preliminary assessment of slope stability in rock was also carried out for rating rock mass. The 3-4 major discontinuity sets are distributed and all type of failure(plane, wedge and toppling failure) are presented in this slope face. The dip of slope must be lowered to friction angle(26degree), otherwise the possibility of plane and toppling faiue will always exist in this slope.

• 생물환경조절학회지
• /
• 제7권4호
• /
• pp.324-329
• /
• 1998

온실내의 일사 투과율을 해석하고자 김과이(1997, 1998)가 개발한 컴퓨터 시뮬레이션 모형을 사용하여 지붕경사각이 온실내의 직달일사 및 산란일사 투과율에 미치는 영향을 분석하였다. 국내의 서울, 전주 및 제주 지역의 10연동 유리온실을 대상으로 지붕경사각이 온실내의 직달일사 및 산란일사 투과율에 미치는 영향에 관한 결과를 요약하면 다음과 같다. 지붕경사각이 15$^{\circ}$, 20$^{\circ}$, 24.6$^{\circ}$ 일 때 산란일사 투과율은 61.3~61.7%로서 거의 일정하였으나, 30。와 35。에서는 56.8~58.6% 로 다소 작게 나타났다. 동계(12월 초순~익년 1월 하순). 춘계(2월 중순~4월 초순) 및 추계(9월 하순~ll월 초순)에 동서동 연동온실에서 직달일사 투과율은 지붕경사각의 영향을 크게 받으나, 하계(5월~8월)에서 직달일사 투과율은 지붕경사각의 영향을 크게 받지 않았다. 즉 동계의 경우 직달일사 투과율이 30$^{\circ}$와 35$^{\circ}$의 지붕경사각에서 높게 나타났으나, 춘계와 추계에서는 20$^{\circ}$의 지붕경사각에서 높게 나타났다. 20$^{\circ}$의 지붕경사각을 갖는 국내의 동서동 온실에서 위도에 따른 직달일사 투과율의 차이가 10월~익년 2월 사이에 나타났으며, 이 시기에 직달일사 투과율은 위도가 낮은 지역에서 높게 나타났다. 남북동 온실의 직달일사 투과율에 미치는 지붕경사각의 영향은 동서동 온실에 비해서 상대적으로 작게 나타났으나, 20$^{\circ}$의 지붕경사각에서 직달일사 투과율이 가장 높게 나타났다. 그러므로 국내에서 직달일사를 많이 확보할 수 있는 온실의 지붕경사각은 20。인 것으로 판단된다. 한편 연동온실의 직달일사 투과율에 미치는 영향은 위도보다 지붕경사각에서 크게 나타났다.

• 한국환경복원기술학회지
• /
• 제16권4호
• /
• pp.41-52
• /
• 2013

This study was carried out in order to analyze the succession characteristics of the slope of expressways and the results of analysis by collecting and analyzing various literatures and data from 2011 to 2012 and surveying 75 expressway slope, as follows : The construction methods applied to planting the slope of an expressway can be classified into 4 types including 3 Climber planting methods, 8 Vegetation thick-layer spray work methods, 4 Seed spray work methods, and 4 Stabilization work methods. The factors which affect the cover degree of the slope of an expressway were found to be development years, gradient, length, and azimuth. Like surrounding forest areas, the expressway slope was analyzed to begin the plant succession 20, 30, and 40 years after development, and plant succession was developed in diversity in a mixed stand forest according to surrounding forest floors. Species diversity, maximum species diversity, and the evenness of slope facing north were analyzed to be high comparing to those facing east, west, and south according to azimuth of slope. Species diversity, maximum species diversity, evenness of slope, and the plant succession of surroundings were analyzed to be high when the gradient of the slope was less than $40^{\circ}$. The dominant species which success on the slope of an expressway and its surrounding forest area included Miscanthus sinensis var. purpurascens, Zoysia japonica, Pinus thunbergii Parl, Rubus crataegifolius, Lespedeza cyrtobotrya, Amorpha fruticosa, Artemisia princeps var. orientalis, and Oenothera biennis.

• 지질공학
• /
• 제18권1호
• /
• pp.45-54
• /
• 2008

본 연구에서는 기 조사된 편마암 지역에서의 급경사지재해 발생지역 및 미발생지역에 대한 현장조사자료 및 토질시험자료를 토대로 통계적인 분석방법인 의사결정나무모형을 이용하여 급경사지재해 예측기법을 개발하였다. 편마암 지역에서의 조사된 급경사지재해 자료는 서울 및 경기지역에서 1998년 집중호우로 발생된 104개소구간이다. 이 가운데 예측모델 개발에 활용된 자료수는 결측치를 제외한 61개소로서, 급경사지재해 발생구간 34개소와 미발생구간 27개소이다. 의사결정나무모형을 이용한 통계적인 분석은 카이제곱 통계량, 지니 지수 및 엔트로피 지수를 적용하여 실시하였다. 분석결과 사면경사, 포화도 및 사면고도가 분리기준으로 선택되었으며, 엔트로피 지수를 이용한 의사결정나무모형 예측모델이 정확도가 가장 높은 것으로 나타났다. 선정된 급경사지재해 예측모델의 분리기준은 최상위부터 사면경사, 포화도 및 사면고도의 순서로 선택되었으며, 각각의 분리기준치는 사면경사의 경우 $17.9^{\circ}$, 포화도의 경우 52.1%, 사면고도의 경우 320m로 결정되었다.

• 한국농공학회논문집
• /
• 제64권4호
• /
• pp.31-43
• /
• 2022

In this study, we estimated the monthly FDSI (Flash Drought Stress Index) for assessing flash drought on South Korea using AMSR2(Advanced Microwave Scanning Radiometer 2) satellite-based soil moisture footprints. We collected the AMSR2 soil moisture and climate-land surface data from April to November 2018 for analyzing the monthly FDSI values. We confirmed that the FDSI values were high at the regions with the high temperature/evapotranspiration while the precipitation is relatively low. Especially, the regions which satisfied an onset of flash drought (FDSI≧0.71) were increased from June. Then, the most of regions suffered by flash drought during the periods (July to August) with the high temperature and evapotranspiration. Additionally, the impacts of landuse and slope degree were evaluated on the monthly FDSI changes. The forest regions that have the steep slope degree showed the relatively higher FDSI values than the others. Thus, our results indicated that the the slope degree has the relatively higher impact on the onset and increasing of flash drought compared to the others.

• Communications for Statistical Applications and Methods
• /
• 제3권1호
• /
• pp.51-59
• /
• 1996

A measure that quantifies the amount of slope retatability for the second degree Scheffe polynomial model for mixture experiments is proposed and used to compare the several mixture designs which met the symmetric momemts conditions in this article.