• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.05a
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• pp.38-39
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• 2015

This study reviewed slump and air content as pre-hardening characteristics depending on B/P production of amorphous steel fiber-reinforced concrete and evaluated compressive strength, flexural strength and tensile strength as post-hardening characteristics depending on B/P production of amorphous steel fiber-reinforced concrete.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.311-314
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• 2004

본 논문은 학습자의 네트워크 환경에 따라서 전송속도를 선택하여 학습할 수 있는 원격강의 시스템을 설계하였다. Windows Media의 스트리밍 대역폭을 300k, 80K, 22K로 제공함으로서 학습자의 네트워크 환경을 고려하였다. 본 시스템은 시간과 공간을 극복한 가상강의에서 학습자의 네트워크 환경을 고려함으로써 재수강의 용이성에 초점을 두고 설계하였다.

• Communications of the Korean Mathematical Society
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• v.18 no.4
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• pp.587-602
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• 2003

본 논문에서는 벡터값을 가지는 함수로 이루어진 벡터 변분 부등식들의 해집합사이의 관계, 미분 불가능한 볼록함수로 이루어진 벡터 볼록 최적화 문제의 해집합들과 볼록함수의 아래미분으로 표현된 벡터 변분부등식의 해집합들과의 관계, 제약집합이 볼록 함수로 구체적으로 주어질 때의 벡터 변분부등식의 해가 될 필요 충분조건, 섭동된 강 단조 벡터 변분부등식의 안정성 결과와 섭동된 벡터 강 볼록 최적화문제에의 적용에 대한 최근 연구 결과를 정리한다.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2003.09a
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• pp.213-220
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• 2003

고층의 강 모멘트저항골조에 대한 지진 반응을 살펴보기 위해서 동적해석을 실시하였다. 구조물은 세가지의 다른 설계절차로 의도적으로 설계하였고 그 세가지의 개념은 강도 지배설계, 강기둥-약보 지배설계, 횡변위 지배설계이다. 그렇게 설계한 구조물이 각각 질량비정형이 존재하도록 하여 힁변위, 소성힌지, 이력에너지 입력 및 요구응력에 대해서 토론하였다. 미래에 설계에의 응용을 위해서 최대 지반가속도로 표현한 두 등급의 지진 하중을 이용해서 이력에너지 입력요구 곡선을 제시하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.11
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• pp.564-572
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• 2017

This study explores lectures experienced by pre-service early childhood teachers at 'S' university who took the linked-courses in Early Childhood Education major, and examine its in-depth meaning. The 29 study participants demonstrated a mock class during the Early Childhood Teaching Method course and developed teaching materials for demonstration during the Early Childhood Teaching Material and Teaching Method course in the first semester of 2017. The researchers analyzed group-based learning journal, teaching portfolio and focus-group interview of pre-service early childhood teachers. The conclusions of this study are as follows. First, pre-service early childhood teachers found that the balanced linkage of two subjects enabled them to effectively concentrate on the course. Second, they were able to organize linked-knowledge by creating teaching materials and preparing for the course after learning from their mistakes. Third, the teachers became able to understand the importance of the experience of linked-courses in Early Childhood Education major. Fourth, they also got to understand the value of special bonds among group members. To summarize, this study suggests the necessity and importance of pre-service early childhood teachers' experience of linked-courses in Early Childhood Education major for their education course.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.1
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• pp.281-287
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• 2011

In anatomical education, cyber class has been studied as a strong strategy coincided with academic characterestics. In the present study, we investigated the correlation between self-evaluation factors, use of cyber classroom and academic achievement of health allied undergraduate students according to application of cyber class in the anatomical education. The subjects of study were totally 231 students who were majored in nursing science (n=143) and sports science (n=88) in last 3 years (2007-2009). Based on frequency of log-in, survey and grade of score, we analyzed correlation of their factors and their scores using frequency analysis, T-test and analysis of variance. Regardless of their major, most of students gave high scores in all of self-evaluation factors, convinience of cyber classroom, suitability of assignment. The frequency of log-in correlated highly with academic achievement(r=0.246, p<0.01, nursing science; r=0.234, p<0.05 sports medicine). The academic achievement also had a high correlation of 0.218(p<0.01) with the level of difficulty in nursing science students, 0.499(p<0.05) with the levels of satisfaction difficulty and interest. in sports science students. This study suggested that cyber class was very useful and would be a promising strategy in anatomical education.

• Journal of the Korean association of regional geographers
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• v.19 no.2
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• pp.259-281
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• 2013

This research aims to analyze Baekdu mountain are with it's the east flowing streams which are the issues on the old maps. Also, it will analyze the eastern flows, Tomoon river; Boongye river; Dooman river, from Baekdu mountain which have been the border settlement issues since Josun dynasty. Also, it will analyze the north-eastern flows, Heukryong river; Songhwa river; Sockpyung river; Tomoon river; Boongye river; Dooman river, from Baekdu mountain which have been the border settlement issues since Josun dynasty. The mainly issued Baekdu mountain's north-eastern flows can be classified into six different flows by the classifications, it proves that there are various Baekdu mountain north-eastern flows on the old maps. the two streams theory of Tomoon and Doman river explains the perspective of the northern expansion, and the one stream theory expresses it by stating Boongye and Sockpyung river as the same one. However, in the case of the meaning of Boongye river is Haeran river on the middle of one stream theory map, there is no region expanding perspective but the same border perspective that Korean peninsula and China match. Boongye river is expressed into four different meanings. (1) It is the same river with Sockpyung and shows the regional expanding perception. (2) It is the same river with Tomoon and the down stream of Tomoon river.(3) It expresses the current name, Haeran river. (4) It simply means the river shows the boundary.

• Journal of the Korean Society of Food Science and Nutrition
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• v.42 no.2
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• pp.255-261
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• 2013

This study investigated changes in the physicochemical characteristics and coffee flavors of coffee beans under different roasting conditions. Four different kinds of roasted coffees were analyzed using a headspace gas chromatographic technique. The moisture content and total acidity of roasted coffee decreased whereas the pH and weight loss (%) increased, as coffee beans were roasted at higher temperatures. The Hunter's color values of the roasted coffee (indicating L (lightness) and b (yellowness)) decreased as the roasting temperature of the coffee beans increased, but a (redness) value only increased with light roasting. We also noted that the color of the Arabica coffee was darker than that of the Robusta coffee. The aroma compounds, acetaldehyde, acetone, 2-methylfuran, 2-methylbutanol, 2-methylpyrazine, furfural, 2-propanone, furfuryl alcohol, 2,5-dimethylpyrazine and furfuryl acetate were mainly analyzed. A sensory evaluation of all light-roasted coffees had flavor and sourness and those of all medium-roasted coffees had heaviness and finishness.

• Journal of Korean Tunnelling and Underground Space Association
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• v.10 no.3
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• pp.269-282
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• 2008

In general, the effects of steel ribs are not considered in the numerical analysis of tunnel design. However, attempts have been increased recently to consider these effects in the analysis of shallow tunnels in soft ground, based on the fact that the steel ribs embedded in the shotcrete take a role to support some portion of the redistributed load due to excavation. In such analyses, the steel ribs can be considered in four different methods: (1) a conventional method where the steel ribs are not considered, (2) a method using the equivalent composite cross section in which the bending moment of shotcrete is not considered, (3) a method using the equivalent composite cross section in which both the compressive stress and the bending moment for the shotcrete and steel rib are considered, and (4) a method using beam elements for the shotcrete and the steel rib, respectively. These methods are adopted in the numerical analysis using FLAC 2D to investigate stresses of both the shotcrete and the steel rib. The overall results show that the analyses are more practical and economical when the effects of steel rib are considered fer the methods (2), (3), and (4). Since the results of those analyses considering steel rib capacity may be different according to the ground condition, it will be necessary to consider the appropriate method among them in accordance with design conditions.

• Economic and Environmental Geology
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• v.37 no.2
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• pp.153-171
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• 2004

This study was carried out to define the geochemical and mineralogical relationship between stream sediments and regional geology on upstream of Hahn river area. Geochemical characteristic including for major elements, trace elements and rare earth elements of the South and North Hahn river bed sediments are similar to those of acid igneous rocks which are distributed around both Hahn river basin. The chemical variation of major elements against SiO$_2$ and trace elements contents between South and North Hahn river bed sediments doesn't show the difference. REE patterns of both area show a distinct negative Eu anomaly, but total contents of rare earth elements are higher in North Hahn river sediments than South Hahn river sediments. The heavy minerals in the river bed sediments in this study area are identified as tremolite-actinolite, hematiteㆍmagnetite, common hornblende, ilmenite, garnet, epidote, rutile and sphene. In conclusion, it is elucidated that South and North Hahn river bed sediments are being originated from igneous rocks or metamorphic rocks which contains medium-high grade metamorphic minerals and components of originated from sedimentary rocks those of politic or calcareous rocks are eroded away as solution or suspended load.