• Journal of Science Education
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• v.39 no.3
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• pp.333-342
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• 2015

The purpose of this research was to investigate the effect of physics learning through the teaching-learning strategy of phased context in introductory physics classes. The participants in the study included 35 university freshmen. The teaching-learning strategy of phased context were developed by idealizing, extending and comparing contexts which were then applied in introductory physics classes : six hour classes about straight line motion, two-dimensional motion and Newton's laws of motion. The effects of the physics learning were then analyzed by the FCI (Force Concept Inventory) and MPEX (Maryland Survey on Physics Expectation) questionnaires. The results showed that the teaching-learning strategy of phased context helped change the force concept and did not change the belief about physics learning. Finally, based on the results of the study, we discuss possible educational implications for phased context in introductory physics classes.

• Journal of Korea Water Resources Association
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• v.46 no.6
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• pp.585-596
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• 2013

The objective of this study is to evaluate the hybrid downscaling method combined Step-Wise Scaling (SWS) method with Regional Climate Model (RCM) simulation data for climate change impact study on hydrology area. The SWS method is divided by 3 categories (extreme event, dry event and the others). The extreme events, wet-dry days and the others are corrected by using regression method, quantile mapping method, mean & variance scaling method. The application and evaluation of SWS method with 3 existing and popular statistical techniques (linear scaling method, quantile mapping method and weather generator method) were performed at the 61 weather stations. At the results, the accuracy of corrected simulation data by using SWS are higher than existing 3 statistical techniques. It is expected that the usability of SWS method will grow up on climate change study when the use of RCM simulation data are increasing.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.394-394
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• 2018

최근 기후변화로 인하여 강수량 및 집중호우 발생 횟수의 증가에 따라 홍수의 발생 빈도 및 강도가 증가한다. 기후변화에 따른 미래의 강수량 예측은 2013년에 발간된 IPCC(Intergovernmental Panel on Climate Change) 5차 평가보고서 (AR5)를 활용하여 분석하고 있다. 기후변화 시나리오에 따라 기온 상승률 및 강수량의 증가량, 극한 강우사상의 발생 빈도 및 발생정도가 다르게 결정되며, 극한 강우사상으로 유발되는 홍수의 피해 정도가 홍수피해 유형별로 다르게 나타난다. 본 연구에서는 기후변화에 따른 미래의 홍수 피해 정도를 예측하기 위하여 홍수에 영향을 미치는 인자 및 홍수를 감소시키는 인자들을 활용하여 단계적 회귀모형을 이용하여 인명피해, 피해면적, 피해액, 발생빈도 등 홍수피해 유형 별로 현재 및 미래의 홍수피해정도를 예측 및 분석하였다. 홍수에 영향을 미치는 인자로 연평균강수량, 일최대강수량, 1시간최대강수량, 10분최대강수량, 호우일수, 인구밀도, 자산밀도, 도로현황, 시가화율 등을 사용하였고, 홍수 피해를 감소시키는 치수대책으로는 하천개수율, 하수도보급률, 양수량, 유수지용량 등을 사용하였다.

• The Journal of the Korea Contents Association
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• v.8 no.2
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• pp.18-26
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• 2008

This paper presents a phased visualization method of facial expression space that enables the user to control facial expression of 3D avatars by select a sequence of facial frames from the facial expression space. Our system based on this method creates the 2D facial expression space from approximately 2400 facial expression frames, which is the set of neutral expression and 11 motions. The facial expression control of 3D avatars is carried out in realtime when users navigate through facial expression space. But because facial expression space can phased expression control from radical expressions to detail expressions. So this system need phased visualization method. To phased visualization the facial expression space, this paper use fuzzy clustering. In the beginning, the system creates 11 clusters from the space of 2400 facial expressions. Every time the level of phase increases, the system doubles the number of clusters. At this time, the positions of cluster center and expression of the expression space were not equal. So, we fix the shortest expression from cluster center for cluster center. We let users use the system to control phased facial expression of 3D avatar, and evaluate the system based on the results.

• Korean Journal of Ichthyology
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• v.17 no.1
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• pp.43-48
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• 2005

We investigated physiological responses of hybrid striped bass (Morone chrysops ${\times}$ M. saxatilis) to gradual changes of salinity from 33 psu to 0 psu and from 0 psu to 33 psu in two separate trials. Gradual salinity change was not accompanied by an increase in cortisol level in the plasma however, the glucose level in the plasma increased. $Na^{+}$, $Cl^{-}$ and osmolality significantly increased with rising salinity, but they did not change with dropping salinity. The hybrid striped bass adjusted effectively without stress to the gentle change of salinity.

• Journal of the Korean Geographical Society
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• v.49 no.5
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• pp.728-746
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• 2014

The purpose of this study is to analyze the influence of the selective migration of young age group and the stage migration which has proceeded through generations, on the transition of fertility and the population growth in the rural and urban in the case of Jeollabuk-do. For this, we use O-D matrix of 20-34 age group, the distribution of that group and women of child bearing age, and vital statistics in 1970-2010. The major findings of this study are as follows. First, the outflows from their birth place are common and dominant features of 20-34 age group in each time. Second, there is the stage migration which preceding generation moved from the rural areas to the cities in Jeollabuk-do and following generation has moved from the cities to Seoul metropolitan area. Third the selective outflow migration of young age group has leaded to reduction of the childbearing population, declining birthrate, aging and natural population decline. Due to the stage migration, these depopulation processes occurred in rural area in the past, and currently it expands to the cities with about 15 years time gap. In fact, there have been the natural population decrease which annual number of deaths exceed that of births from the late 1980s in the most rural areas and in the early 2000s, such a phenomenon has been confirmed also in urban areas. Therefore, this study concludes that the stage migration through generations is one of the crucial factor to the population growth in local cities and also brings out the step-wise population decrease in settlement hierarchies.

• Land and Housing Review
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• v.7 no.3
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• pp.157-164
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• 2016

Recently, the paradigm of land development has been transformed from the joint development to the step-by-step development due to changes in socio-economic conditions. Nevertheless, the introduction of large-scale transportation facilities such as new transportation system tends to employ the joint development. Although new transportation system is eco-friendly, it occasionally fails at the beginning of the project because of high installation cost. Such phenomenon is caused by not only the system did not reflect the local characteristics but also did not respond to the step-by-step development. Accordingly, in order to introduce transportation system rationally, introducing new methods corresponding to the step-by-step development should be sought. In this study, we assumed that large-scaled land development site be achieved step-by-step development. and suggested the need for a phased introduction through benefit-cost analysis. The findings illustrated that the phased introduction shows economic efficiency with 30% increase of B/C compared to the bulk introduction. It also demonstrates that the bulk introduction under step-by-step development is more efficient than the bulk introduction under joint development.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.473-476
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• 2011

최근 3D영화의 흥행과 더불어 3D 영상제작 기술들이 높은 관심을 받고 있다. 변이 정보를 획득하기 위한, 스테레오 매칭에 관한 분야는 꾸준히 연구가 되고 있는 분야이다. 그 중에서도 지역적 방법은 구현의 용이성과 낮은 계산복잡도로 인하여 많은 연구가 진행되고 있다. 하지만 대부분의 지역적 방법들은 영상이 외부환경에 변형되었을 때의 경우를 고려하지 않고 있기 때문에, 외부환경에 의해 많이 변형된 영상에 대해서는 제대로 된 변이 정보를 추출해내지 못한다. 본 논문에서는 양쪽 영상에서 픽셀간의 차이를 이용하여 서로 대응되는 영역을 찾는 스테레오 매칭 기법을 제안한다. 제안하는 기법은 조명과 같은 외부요소에 강인한 특징을 가진다. 이 기법은 전 처리나 후처리 과정에서 부가적인 작업의 수행 없이 기법 자체만으로 외부요소에 대한 보상을 실행한다는 면에서 장점을 가진다. 다양한 영상에서 변이를 추출하는 실험 결과, 단계적 조명 변화에 대해서도 대조군 방법과 비교하여 균일한 변이 영상을 획득할 수 있었다.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.05c
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• pp.371-376
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• 2002

본 논문은 영역 분할에 기반한 스테레오 정합에 있어서, 분할영역 내부에 존재하는 단계적인 변위의 변화를 추정할 수 있는 스테레오 정합 알고리즘에 관한 것이다. 우선, 분할영역을 효과적으로 표현할 수 있는 복수의 샘플점들을 선정한 다음에 각 샘플점 주위에 인접한 영역 내부의 미소영역을 취하여 스테레오 정함을 수행한다. 이후, 획득된 각 샘플점들의 변위를 이용하여 평면의 방정식을 통해 내부 변위를 보간함으로써 연산 시간을 감축함과 동시에 영역 내부의 단계적인 변위의 변화를 추정할 순 있다. 제안된 방법에 따르면, 분할된 영역을 사용함으로써 분할영역 자체가 구속 조건이 되어 특징 기반 기법들의 단점인 변위 보간의 문제점을 해결할 수 있다. 특히, 복수의 샘플점들 간의 변위차를 이용함으로써 영상 평면에 대해 깊이 방향으로 기울어진 영역 평면에 대한 변위의 기울기를 보간할 수 있음에 기인하여 조밀한 변위 맵을 얻을 수 있었다.

• KAPE Magazine
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• no.5 s.141
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• pp.4-6
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• 2008

지난 4월 18일 농림수산식품부는 보도자료를 통해 '미국산 쇠고기 단계적 수입확대 합의'를 밝히고 이에 따른 국내 축산업 대책발표(4월 21일)를 하였다. 본고는 독자의 이해를 돕기 위해 정부가 발표한 국내 축산업 대책을 게재하고 동 기간 동안 한우등급판정 두수와 등급별 가격변화를 알아보기로 한다.