• 대기
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• 제27권2호
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• pp.199-211
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• 2017

The cold surges over East Asia can be grouped to two types of the wave-train and the blocking. Recently, the observational study proposed new dynamical index to objectively identify cold surge types. In this study, the dynamical index is applied to the simulations of 10 climate models, which participate in the Coupled Model Intercomparison Project Phase 5 (CMIP5). Focusing on assessment of cold surge simulation, we discuss characteristic of the wave-train and blocking cold surges in the climate models. The wave-train index (WI) and the blocking index (BI) based on potential temperature anomalies at dynamical tropopause over the subarctic region, the northeast China, and the western North Pacific enable us to classify cold surges in the climate models into two types. The climate models well simulate the occurrence mechanism of the wave-train cold surges with vertical structure related to growing baroclinic wave. However, while the wave-train in the observation propagates in west-east direction across the Eurasia Continent, most of the models simulate the southeastward propagation of the wave-train originated from the Kara Sea. For the blocking cold surges, the general features in the climate models well follow those in the observation to show the dipole pattern of a barotropic high-latitude blocking and a baroclinic coastal trough, leading to the Arctic cold surges with the strong northerly wind originated from the Arctic Sea. In both of the observation and climate models, the blocking cold surges tend to be more intense and last longer compared to the wave-train type.

• 한국과학교육학회지
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• 제23권5호
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• pp.484-493
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• 2003

본 사례연구를 통하여 과학수업 관찰과 분석의 실례를 제공하려고 한다. 수업관찰과 수업 전후에 걸친 교사와의 심층 면담을 실시하였으며, 수업에 활용된 교수학습 자료들을 수집하였다. 한 과학 교사의 수업을 (1)교육과정 및 교과내용 측면, (2)교수학습 방법, (3)학습자에 대한 이해, (4)수업 분위기, (5)평가, (6)교사의 전문성 개발을 위한 노력 등의 6가지 범주에 초점을 맞추어 관찰하고 분석하였다. 본 사례연구 교사는 스스로의 수업개선을 위해 노력하고 있을 뿐만 아니라, 그의 실천적 지식을 다른 교사들과 공유하기 위하여 현직교사 연수에도 활발히 참여하고 있었다. 타당한 수업 평가틀(관찰틀)이 교사교육 및 현직 교사들의 전문성 개발에 주는 시사점도 논의되었다. 이러한 수업 평가틀은 교사들에게 고도로 숙달된 수업 실제에 대한 지향점을 제공할 것이다.

• 대기
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• 제29권2호
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• pp.183-196
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• 2019

High-quality and high-resolution meteorological information is essential to reduce damages due to disastrous weather phenomena such as flash flood, strong wind, and heat/cold waves. There are many meteorological observation stations operated by Korea Meteorological Administration (KMA) in Seoul Metropolitan Area (SMA). Nonetheless, they are still not enough to represent small-scale weather phenomena like convective storm cells due to its poor resolution, especially over urban areas with high-rise buildings and complex land use. In this study, feasibilities to use additional pre-existing networks (e.g., operated by local government and private company) are tested by investigating the effects of network density on the gridded horizontal distribution of two meteorological variables (temperature and precipitation). Two heat wave event days and two precipitation events are chosen, respectively. And the automatic weather station (AWS) networks operated by KMA, local-government, and SKTechX in Incheon area are used. It is found that as network density increases, correlation coefficients between the interpolated values with a horizontal resolution of 350 m and observed data also become large. The range of correlation coefficients with respect to the network density shows large in nighttime rather than in daytime for temperature. While, the range does not depend on the time of day, but on the precipitation type and horizontal distribution of convection cells. This study suggests that temperature and precipitation sensors should be added at points with large horizontal inhomogeneity of land use or topography to represent the horizontal features with a resolution higher than 350 m.

• 천문학회보
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• 제46권1호
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• pp.46.1-46.1
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• 2021

Hydrated asteroids get widespread attention for the evolution of water in the Solar System, especially thanks to the recent successes of the Hayabusa2 and OSIRIS-REx space missions. The target asteroids of these missions are believed to be fragments that have experienced aqueous alteration in their parent bodies [3]. Although hydrated asteroids have been studied well via spectroscopy, focusing on the 0.7 um or the 2.7 um absorption bands [2, 3, 4], polarimetric properties of these asteroids have rarely been investigated. In this study, we conducted a polarimetric observation of 18 C-complex main-belt asteroids with the 1.6-m Pirka telescope at the Nayoro Observatory of Hokkaido University, Japan. We used a polarimetric imaging mode of the Multi-Spectral Imager (MSI) with the standard Rc-band filter (the central wavelength at 0.64 um) [5]. As a result, we found that all of these hydrated asteroids indicate deep negative branches of their polarimetric profiles. Accordingly, the hydrated asteroids have the polarization minima (Pmin), whose values are significantly lower than any other taxonomic types of asteroids (including C-group asteroids). Because Pmin depends on albedo, particle size, and porosity of the surface materials [1], we suspect that hydrated asteroids are distinctive from other asteroids in terms of these physical properties. In this presentation, we introduce our polarimetric observation and findings. We discuss why hydrated asteroids indicate such low Pmin values, comparing Pmin with spectral features at 0.7 um and 2.7 um based on the observation results.

• 한국과학교육학회지
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• 제26권3호
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• pp.406-414
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• 2006

이 연구에서는 7학년 학생들의 빛의 이동경로에 대한 개념의 상황의존성을 물체의 관찰, 물체의 거울상 관찰, 거울에 비친 자신의 얼굴상 관찰이라는 세 가지 서로 다른 상황에서 연구하였다. 면담을 통해 각 상황에 대한 학생들의 반응을 조사하였으며, 세 가지 상황에 대한 학생들의 설명을 바탕으로 학생들을 네 그룹으로 나누었다. 각 그룹은 다시 개념특성에 따라 2-3개의 하위집단으로 나누었으며, 각 하위집단의 특성을 조사하였다. 연구결과 (1) 그룹 1의 학생들의 개념은 각 상황에 따라 변화하였다; (2) 그룹 2의 학생들은 C1 상황에선 과학적 개념을 나타냈지만 C2 상황에선 시선개념이나 상에 대한 오개념을 나타냈다; (3) 그룹 3의 학생들은 얼굴의 거울상에 대한 강한 오개념 때문에 과학적 개념을 포기하였다. 제언 부분에서는 이러한 연구 결과를 바탕으로 빛 단원에 대한 교수-학습방법의 개선점을 논의하였다.

• 대한원격탐사학회지
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• 제34권3호
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• pp.465-480
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• 2018

2017년 1월 20일 영동 뇌설 사례는 강수 초기 3시간 동안 20 cm 이상의 강한 강설이 낙뢰와 함께 영동 해안 지역에 나타났다. 이 연구에서는 강한 강수 기간 동안 고층 관측 자료를 이용하였고, 고층 관측 장비는 북강릉 지점의 연직바람관측장비, 라디오미터 그리고 레윈존데를 사용하였다. 북강릉과 강릉원주대학교에서 강한 강수가 나타났을 때 연직 바람과 기온의 특징을 조사한 결과는 다음과 같다: 1) 2~6 km에서 강한 북동풍 그리고 4~6 km에서 $-18^{\circ}C\;km^{-1}$ 이상의 기온 감률을 보이는 강한 대기불안정이 관측되었다. 이러한 특징은 대류운이 6 km 이상 고도까지 발달하였음을 나타낸다. 2) 1 km 이하에서 기온의 감소가 나타났으며, 이것은 북강릉 지점 AWS 지상 기온이 약 30분 동안 $4^{\circ}C$ 감소한 것과 잘 일치한다. 이러한 기온 감소는 동서 방향의 좁은 영역에서 나타나고 레이더 에코와 낙뢰 분포 영역도 동일한 위치에서 관측되었다. 이것은 중위도 저기압의 한랭전선형 강수의 특징과 유사하다. 결과적으로 영동 뇌설 사례는 한랭전선형 강수와 대류성 강수의 영향이 결합된 시스템으로 분석하였다.

• 복식
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• 제64권4호
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• pp.52-75
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• 2014

The purpose of this research is to classify the historical features of mid-to-late twentieth century Korean fashion with a focus on 'Nora Noh', who is a first generation Korean fashion designer. The specific questions of this research are as follows: how did mid-to-late twentieth century Korean fashion and the Nora Noh brand develop and what is the relationship between the two? What are the important features of Korean women's fashion design in the mid-to-late twentieth century? What are the characteristics exhibited in each decade in Korean women's fashion and Nora Noh's fashion? This paper conducted the research by focusing on the Korean fashion development as a background of simplification in the way of dressing and specific historical incident. Researchers deployed a qualitative research method providing a systematic review of the previous studies by analyzing content as well as eleven oral statement interviews and the case study of Nora Noh. The result shows that Nora Noh is one of the first generation of Korean fashion designers who led fashion trend and system in Korea. The designer also influenced Korean commercial fashion in the 1970s and American fashion trends in the 1980s.

• International Journal of Aeronautical and Space Sciences
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• 제10권1호
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• pp.91-97
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• 2009

It is undertaken systematization of results of satellite and ground observation parameters characterizing a current condition and climatic variability of two selected geographical areas. One of them covers territory of Azerbaijan and another covers a wide area of Caspian See region. Average values and mean square deviations of following values are investigated: outgoing long wave radiation during a day and night (in nebulosity and cloudless). absorbed within a day of the stream of a sunlight of the system in "a terrestrial surface-atmosphere". degree of a covering by clouds of the selected areas during a day and at night, ground temperature values of air. pressure and speed of a wind. Monthly average values of corresponding parameters create a basis of suggested investigations. It has been presented features of a time course of investigated parameters for each month and year in the whole due to the continuously observations since 1982-2000. The scientific problem consists that there are no existed models which authentically would be cover the main aspects of a realities specified changes: they are identified by economic activities. growth of the population and other features of development of a human society or internal fluctuations of biogeophysical/climatic system. Possibilities of predictability of biosphere and climate changes depend on available timely supervision. adequacy of construction of appropriate models. understanding of mechanisms of direct and feedback influences in such complicated systems.

• 한국멀티미디어학회논문지
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• 제6권4호
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• pp.698-706
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• 2003

The primary goal of surface approximation is to reduce the degree of deviation of the simplified surface from the original surface. However it is difficult to define the metric that can measure the amount of deviation quantitatively. Many of the existing studies analogize it by using the change of the scalar quantity before and after simplification. This approach makes a lot of sense in the point that the local surfaces with small scalar are relatively less important since they make a low impact on the adjacent areas and thus can be removed from the current surface. However using scalar value alone there can exist many cases that cannot compute the degree of geometric importance of local surface. Especially the perceptual geometric features providing important clues to understand an object, in our observation, are generally constructed with small scalar value. This means that the distinguishing features can be removed in the earlier stage of the simplification process. In this paper, to resolve this problem, we present various factors and their combination as the metric for calculating the deviation error by introducing the orientation of local surfaces. Experimental results indicate that the surface orientation has an important influence on measuring deviation error and the proposed combined error metric works well retaining the relatively high curvature regions on the object's surface constructed with various and complex curvatures.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2009년도 춘계 종합학술대회 논문집
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• pp.1020-1025
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• 2009

오행이론은 사람들이 객관세계에 대해 장기간 관찰하여 얻어낸 이론이다. 그 핵심적인 내용은 세상만물을 목' 화' 토' 금' 수 등 다섯 가지 물질형태로 귀납하여 상생상극(相生相克)인 상호작용을 부여한 것이다. 오행이론에는 인물의 외모 특징을 귀납한 면상학내용이 있다. 그리고 인물의 외모특징과 인물의 성격특징이 상호 대응되어 추상적인 성격을 구상화한 방법을 형성하였다. 본문은 세계적으로 유명한 애니메이션 몇 부에 대한 분석을 통하여 이러한 캐릭터의 성격특징과 조형특점을 정리한 뒤 오행이론중의 인물성격' 인물 외모와 비교하여 캐릭터디자인과 오행이론사이의 대응성을 연구하였다.