• Journal of the Korean Geographical Society
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• v.13
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• pp.13-19
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• 1976

본 고에서는 기후학연구의 동향을 대략 살펴보고자 한다. 우리나라 기후학연구의 시작은 해방과 한국동란의 긴 격동기를 거쳐 1960년대에 들어와서라고 할 수 있고, 본격적인 연구는 1970년대에 들어서면서라고 볼 수 있다. 연구분야에 있어서는 기후분류를 주로했던 초기단계에서 기후요소나 변동을 다루게 되었고 최근에는 기후지형, 수분수지, 기단기후, 체감기후등의 방향으로 관심이 높아졌다. 그러나 meso scale이나 micro scale의 연구가 개척되지 않고 macro scale의 기후연구에 머물러 있는 감이 있다. 60년대 후반에서 70년대 초반에 걸친 우리나라의 산업근대화나 인구의 증가, 급속한 도시화에 따라 중기후나 소기후 연구의 필요성이 높아졌고 특히 일약팽창하는 도시에 있어서의 기후환경의 연구는 현대생활에 불가피의 과제이다. 이 방면에 약간의 연구가 시작되기는 하였지만 아직도 많은 연구문제가 방치되어있다. 중.소기후의 연구에는 현재보다 훨씬 많은 관측망의 설치가 선행되어야 할 것이며 도시기후의 관측에는 관측계기나 관측에 따르는 재정적인 문제가 달려있다. 이와같은 분야의 연구는 연구 team의 문제도 있어 개인연구로서는 도저히 감당하기 어려운 분야이다. 따라서 연구기관이나 국가의 지원하에 도시기후의 공동연구가 추진되어야 할 것이다.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.9 no.1
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• pp.1-12
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• 2004

Sedimentary facies and high-resolution echo facies were analyzed to elucidate sedimentation pattern of the late Quaternary glacial-marine deposits in the northern continental margin of the South Shetland Islands. Six sedimentary facies are classified, based on grain texture and sedimentary structures in gravity cores. The high-resolution (3.5 ㎑) echo characters are classified into 6 echo facies on the basis of clarity, continuity, and shape of bottom and subbottom echoes together with seafloor topography. Distribution of the echo and sedimentary facies suggest that there was a significant change in sedimentation pattern between the Last Glacial Maximum (LGM) and subsequent glacier-retreating period. When the grounded glaciers extended to the present shelfbreak during LGM, coarse-grained subglacial tills were widespread in the shelf area, and deep troughs in the shelf were carved beneath the fast-flowing ice steam. As the glacial margin retreated landward after LGM, dense meltwater plumes released from the retreating ice-front were funneled along the glacier-carved troughs, and accumulated channel- or cannyon-fill deposits in the shelf and the upper to mid slope. At that time, slope sediments seem to have been reworked by slope failures and unsteady contour currents, and further transported by fine-grained turbidity currents along the South Shetland Trench. After the glacial retreat, sediments in the shelf and slope areas have been mainly introduced by persistent (hemi) pelagic settling, and fine-grained turbidity currents frequently occur along the axis of the South Shetland Trench.

• The Korean Journal of Quaternary Research
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• v.12 no.1
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• pp.17-30
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• 1998

연구지역인 대관령 서쪽 산지 사면은 진부에서 동쪽으로 고속도로를 따라 약 21km 떨어진 대관령까지이며 해발고도는 500∼900m 지형경사는 3.3%이다. 1989년 5월∼1992년 5 월에 진부에서 대관령 쪽으로 영동고속도로를 따라 진부(고도 544m) 간평기(고도 576m) 유 천리(고도 600m) 싸리재(고도800m) 대관령(고도 842m)등의 5개지점을 정하여 일 강수량을 측정하였다 각 고도별 일 강수량 자료를 기초로 한반도의 지상 기압배치형에 따른 대관령 서쪽 산지의 고도별 강수량 분포의 특성을 고찰하였다,. 이결과를 용약하면 다음과 같다. 총 강수일 258일을 지상 기압배치형(기압골, 저기압, 시베리아고기압, 장마전선, 고기압, 태풍, 오호츠크해고기압)에 따라 7가지 형으로 분류하였다, 이들중 기압골이 나타난 날이 113일로 제일 많고 오호츠크해고기압이 나타난 날은 8일로 가장적었다. 고도별 일평균 강수량은 태 풍이 나타났을 때 17,5∼54,4mm로 제일많았고 시베리아고기압이 나타났을 때는 5.9∼ 19.8mm로 제일 적었다, 대관령 서쪽 산지 사면에서 강수량이 제일 많은 고도는 대관령이고 제일적은 고도는 간평리이다, 태풍과 오호츠크해고기압이 출현한 경우는 고도가 증가할수록 강수량도 많아졌다. 간평리와 대관령 고도의 강수량 분포에 관한 사례분석(1989.5∼1991.12) 에서 기압골, 저기압, 장마전선등이 나타난 36일 시베리아고기압이 나타난 1일은 간평리가 대관령보다 강수량이 많았다.

• Journal of The Geomorphological Association of Korea
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• v.18 no.4
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• pp.223-233
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• 2011

The aims of this study is about distribution characteristics of tidal coastal landforms, and that changing process in the Hampyeung Bay, which has a semi-enclosed bay like basin shape without inflow of stream, the mouth of open sea is narrow and forms with wide ends toward inland sea. The source of deposits are moved materials by tidal currents and from coastal slopes. Main landform elements of study area consist of tidal flat, tidal channels, intertidal sand bar, sea cliffs, and sea terrace. Tidal flats is classified with mud flat and mixed flat by grain size composition. Mud flats have developed at the shoreline area that tidal flat is closed to the continuity of gentle slope, and mixed flat developed at the foot of the sea cliffs and sea terraces. Quaternary deposits were identified in the coastal materials sedimented by the sea-level change. According to the analysis of grain size composition during last ten years, sands and silt has increased 2% and 6% respectively, clay has been decreased by 9%. The concaved tidal flats are colonized by salt plants. Areal changes of salt plants expanded near four times from 2.4km² at the year 2001 to 9.3km² at the year 2009. During the same periods, mean grain size became coarser from 6.5φ to 4.5φ at the salt plants area.

• Journal of the Korean Institute of Intelligent Systems
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• v.24 no.5
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• pp.536-541
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• 2014

Data through meteorological radar includes ground echo, sea-clutter echo, anomalous propagation echo, clear echo and so on. Each echo is a kind of non-precipitation echoes and the characteristic of individual echoes is analyzed in order to identify with non-precipitation. Meteorological radar data is analyzed through pre-processing procedure because the data is given as big data. In this study, echo pattern classifier is designed to distinguish non-precipitation echoes from precipitation echo in meteorological radar data using RBFNNs and echo judgement module. Output performance is compared and analyzed by using both HCM clustering-based RBFNNs and FCM clustering-based RBFNNs.

• Journal of the Korean Geotechnical Society
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• v.21 no.6
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• pp.101-115
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• 2005

For the site characterization at two inland areas, Gyeongju and Hongsung, which represent geomorphic and geologic characteristics of inland region in Korea, in-situ seismic tests containing borehole drilling investigations and resonant column tests were peformed and site-specific seismic response analyses were conducted using equivalent linear as well as nonlinear scheme. The soil deposits in Korea were shallower and stiffer than those in western US, from which the site coefficients and site classification system in Korea were derived. Most sites were categorized as site classes C and D based on the mean shear wave velocity $(V_s)$ of the upper 30 m $(V_s30)$, ranging between 250 and 650 m/s. According to the acceleration response spectra determined from the site response analyses, the site coefficients specified in the current Korean seismic design guide underestimate the ground motion in the short-period band and overestimate the ground motion in mid-period band. These differences can be explained by the differences in the bedrock depth and the soil stiffness profile between Korea and western US. The site coefficients, $F_a$ for short-period and $F_v$ for mid-period, were re-evaluated and the site classification system, in which sites C and D were subdivided according to $V_s20,\;V_s15,\;and\;V_s10$ together with the existing $V_s30$ was introduced accounting for the local geologic conditions at inland region of the Korean peninsula. The proposed site classification system in this paper is still rudimentary and requires modification.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.1
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• pp.35-44
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• 2022

The V_S30 map is used as a key variable for site amplification in the ShakeMap, which predicts ground motion at any site. However, no V_S30 map considering Korean geology and geomorphology has been developed yet. To develop a proxy-based V_S30 map, we used 1,101 V_S profiles obtained from a geophysical survey and collected proxy layers of geological and topographical information for the Korean Peninsula. Then, V_S30 prediction models were developed using linear regression analysis for each geological age considering the distribution of V_S30. As a result, models depending on geomorphology were suggested per each geologic group, including Quaternary, Fill, Ocean, Mesozoic group and Precambrian. Resolution of map is doubled from that of V_S30 map by U.S. Geological Survey (USGS). Standard deviation of residual in natural log of proxy-based V_S30 map is 0.233, whereas standard deviation of slope-based USGS V_S30 map is 0.387. Therefore, the proxy-based V_S30 map developed in this study is expected to have less uncertainty and to contribute to predicting more accurately the ground motion amplitude.

• 한국노년학
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• v.40 no.4
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• pp.781-800
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• 2020

This study aims to categorize the daily time use of older adults into different types, examine the factors influencing them and the differences between them by type, and verify the effect of each type on life satisfaction. From the 6th wave of the Korea Retirement and Income Study (KeRIS), analysis was conducted on 3,963 older adults aged 65 (n=3,963). Using Latent Profile Analysis (LPA), three types of daily time use for older adults were identified: basic life maintenance type (16%), free-leisure oriented type (26%), and social activity type (58%). From the results of multinomial logistic regression analysis to identify the factors influencing each type of daily time use, it was found that the main factors influencing free-leisure oriented type, when compared with basic life maintenance type, were the presence of spouse (p<.01) and psychological health status (p<.001). The main factors influencing social activity type, when compared with basic life maintenance type, were age (p<.05), economic activity (p<.001), and chronic disease (p<.001). The life satisfaction seen during free-leisure oriented time and social activity time was higher than that during basic life maintenance time. From these findings, practical and policy proposals were suggested to improve life satisfaction of older adults during basic life maintenance time by pursuing changes in the use of that time.

• Journal of the Korean earth science society
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• v.26 no.8
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• pp.828-835
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• 2005

The purpose of this study is to clarify the landform development of fluvial terrace and the soil characteristics occurring on the terrace deposit. In order to achieve the purpose, the characteristics of soil profiles, the physic-chemical properties of soils that are developed on terrace deposits and X-ray diffraction analysis of clay were investigated. The horizon of Al in the high fluvial surface is silt clay loam of red (2YR 4/6). The soil structure is a developed granular structure. The horizon of B1 is silt clay reddish-brown (2.5YR 4/6). The soil structure is a medium subangular blocky structure. This red soil structure is made on heavy textured and compactly packed parent materials of high terrace sediments and usually has A-B-C profile. In most cases, clay accumulations in B-horizon and clay cutans on ped surfaces are observed, which mean the formation of agrillic horizon. As the result of this study, soils derived from fluvial terrace deposits on high fluvial surfaces are considered paleo-red soil which were developed by pedogenese-strong desilicification and rubefaction and strong leaching of bases- under warmer bio-climatic condition during in the old Pleistocene period.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.299-299
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• 2020

국내외 발생하는 재난 중 70% 이상이 물과 관련된 재해로 분류되며, 집중호우와 태풍으로 인한 하천범람 및 내수침수 등으로 많은 피해를 발생시키고 있다. 특히 최근 발생하는 피해 양상은 과거에 발생하지 않았던 극한 강우로 인해 돌발적으로 발생하는 경우가 빈번하게 발생하고 있어 이에 따라 사전에 예측하여 미리 대비하는 선제적인 홍수 대비 시스템이 요구되고 있다. 선제적인 홍수 대비 시스템의 구축 여부는 정확한 하천 흐름 예측을 필요로 한다. 하지만 하천의 흐름은 댐붕괴, 제방붕괴, 하천 하상의 변동 등 다양한 상황에서 급격한 흐름의 변동이 발생하며, 이는 하천 흐름 예측에 장애물로 작용하여 정확도를 떨어뜨리는 요인이 된다. 특히 국내에는 산악지형과 수공구조물에 의한 불연속 단면이 다수 존재하고 있어 그 예측 결과에 대한 정확성에 대한 요구가 더욱 부각되고 있다. 그렇기 때문에 해당 문제를 해결하기 위한 다양한 기법들이 개발되어 실무에 적용되고 있으나 어떤 기법이 국내 하천특성에 적합한지 파악할 수 없으며, 그 정확성과 안정성에 측면에서 여전히 많은 문제점을 가지고 있는 실정이다. 본 연구에서는 불연속 흐름이 빈번하게 발생하는 국내 하천 특성에 적합한 수치 기법을 확인하고자 유량보존특성을 만족하는 유한체적기법 중 국내외적으로 다수 사용되었던 기법들을 비교 및 평가하였다. 불연속 흐름의 대표적인 예제로서 'Dam-break problem'과 충격파 해석 및 홍수기와 갈수기에 따른 하천 하상의 마름/젖음에 대한 평가를 할 수 있는 Toro's Riemann problems에 적용하여 비교하였으며 그 결과 값을 정량적인 수치로 나타내었다. 이를 통해 국내 하천 특성에 적합한 수치 기법을 선정하였으며. 향후 국내하천 환경을 만족할 뿐만 아니라 하천 종사자들의 요구에도 부합한 하천흐름해석 모형의 개발 시 많은 기여가 될 것이라 판단된다.