• Journal of Korean Society of Coastal and Ocean Engineers
• /
• v.20 no.3
• /
• pp.310-320
• /
• 2008

Water temperature and salinity variation patterns were analysed using the CTD data measured in the Yeochari, Dongmakri and Donggeomdo intertidal zone, south of Ganghwado. Only the data during the submersion period of the measurement stations were used in this analysis. It is clearly shown that the correlation between air and water temperatures is very low and the water temperature variation shows clearly the opposite patterns as the tidal elevation increases and decreases. Whereas, the salinity change shows the similar pattern of the tidal elevation change pattern because the salinity change pattern could be described as the increasing function from the shoreline to offshore regions due to the continuous ground-water inflow in the adjacent watersheds. The salinity is increased from the submersion time to the high tide and decreased from the high tide to the exposure time.

• Journal of Korean Society of Coastal and Ocean Engineers
• /
• v.19 no.4
• /
• pp.385-398
• /
• 2007

It was analysed that spatial and temporal change patterns of general water quality constituents were measured monthly from 2002 to 2005 in Jumunjin Harbour. The measured constituents are temperature, salinity, pH, SS and DO. Concentration difference of upper lower layer for general water quality constituents was small. Temperature and DO concentration show the clear difference at temporal concentration change pattern, but SS, pH and salinity have irregular change pattern. Also, water quality improvement effect of seawater exchange facilities and sewage treatment plants is analysed quantitatively using averaged spatial and temporal data set. From this result, it is found that effect of sewage treatment plants is small and seawater exchange facilities at zone 1 and 2 is clear concentration reduction effect to be about 26% and 16%, respectively. After sewage treatment plants operation, DO concentration reduced about 10% at inner zone of Jumunjin Harbour, the other side, after seawater exchange facilities concentration DO concentration increased about 10%. DO concentration at 2005 estimated little than that of 2002, it is concluded that a yearly change of DO concentration has about 10%.

• Proceedings of the Korea Technology Innovation Society Conference
• /
• 2017.11a
• /
• pp.591-608
• /
• 2017

이 연구는 한국의 산업발전 과정에서 '기술혁신'이라는 개념이 어떻게 변화하며 사용되어 왔는지를 분석하고자 한다. 이를 위해 한국과학기술단체총연합회(이하 과총)의 기관지인 "과학과 기술" 기사에서 등장한 '기술혁신' 키워드를 중심으로 네트워크 분석을 실시하였다. "과학과 기술"은 1968년부터 지금까지 꾸준히 발간되었으며, 과학기술인 뿐만 아니라 정부부처 관계자 및 과학 분야 기자들을 대상으로 하기 때문에 한국 과학기술사회 전반의 동향을 파악하기 위한 사료로서 가치가 높다. 본 연구에서는 1968년 이후 "과학과 기술"에 실린 기사들 중 제목에 '기술혁신' 키워드가 포함된 모든 기사의 전문을 분석 대상으로 출판 이후부터 현재까지의 기간을 세 구간으로 나누어 '기술혁신'과 동시출현하는 키워드들의 변화 양상을 분석하였다. 이와 같은 분석을 통해서 이 연구는 다음과 같은 결과를 도출하였다. 첫째, 기술혁신 개념은 1970년대와 크게 다를 바 없이 지금까지도 여전히 국가 주도의 산업 발전을 위한 요소로 이해되고 있었다. 둘째, 그럼에도 불구하고 공업, 생산에 국한되어 있던 기술혁신 개념은 1980년대를 거치며 다양한 연구개발 분야 및 이해관계자들을 이어주는 키워드로 변화하였다. 본 연구는 키워드 네트워크 분석을 통해 한국 기술혁신 논의의 변화 양상을 제시하였다는데 의의가 있으며, 연구 결과는 향후 한국적 맥락을 기반으로 한 기술혁신정책의 방향성을 모색하는데 활용될 수 있을 것으로 기대된다.

• Journal of The Korean Association For Science Education
• /
• v.36 no.6
• /
• pp.835-849
• /
• 2016

The purpose of the present study is to analyze the trajectory of science core school students' STEM career motivation and to examine the relationship between the trajectory patterns and students' tracks. Longitudinal STEM career motivation data with seven constructs were collected from 256 students for five semesters and the data were analyzed by using group-based trajectory modelling analysis. In order to examine the relationship between trajectory pattern groups and the tracks, chi-square tests were conducted. Based on our findings, we found that students are likely to have similar trajectory patterns in STEM career education experience and in their perception towards STEM career value. In terms of parents' support, academic self-efficacy and STEM career motivation aspects are divided into two distinctive trajectory groups ('high' and 'low' group), while two other variables, STEM career self-efficacy and STEM career interest, are divided into three trajectory groups ('moderate declining', 'high declining', 'increasing' group). Most of the trajectory groups are shown the pattern that the level of each constructs increase until their second academic year, then after that, the patterns started going down. Moreover, there are significant relationship between track and each trajectory groups. Science track and science-core track students have similar trajectory patterns. In contrast, humanities track students have different trajectory groups in some constructs. Based on these findings, we suggest that STEM career education environment should consider various patterns of students' STEM career development.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2019.05a
• /
• pp.260-260
• /
• 2019

해안과 만나는 하천의 하구부에서는 해수의 흐름에 따른 연안토사의 이동과 유황에 따른 하천상류에서의 토사유입량에 의해 하구부가 빠르게 변화한다. 본 연구대상지인 가곡천은 유로연장이 짧고 경사가 급한 산지하천의 특징을 가지고 있어 집중호우시 토사가 하류로 빠르게 유입되어 일반하천에 비하여 하구부의 지형변화가 크게 일어난다. 가곡천 하구부는 모래사장으로 이루어져 있는 호산해수욕장과 경관적 및 자연적 가치로 인해 보존 필요성이 대두되고 있는 하중도인 솔섬이 위치해 있다. 그러나 현재 솔섬 주변 하구부 인근의 일반산업단지 건설과 고향의 강 조성사업에 따른 하도환경의 변화로 하도를 유하하는 유수의 흐름 및 침퇴적 양상의 변화를 가져와 홍수의 원활한 소통에 지장을 초래하고 있다. 또한 현장조사 및 모니터링 결과 하구 지형변화로 인해 하도안정 유지관리에도 막대한 영향을 끼치는 것으로 확인되었다. 따라서 본 연구에서는 가곡천 하구부의 하도환경 변화에 따른 수리학적 특성 및 하천형태학적인 변화를 분석하여 하도안정을 파괴하는 요인을 규명하기 위한 연구를 수행하였다. 연구방법은 가곡천 하천정비기본계획의 빈도별 홍수량, 기점홍수위를 경계조건으로 2차원 수리해석 모형인 SRH-2D모형을 이용하여 하도환경 변화 전 후의 대상구간에 대해 수리특성 및 하상변동 양상을 모의하였다. 모의결과 하도환경 변화(홍수터 및 징검여울 등의 하천시설물 조성)에 따른 수리특성변동양상과 침 퇴적지점에 대한 변동경향을 확인할 수 있었다. 본 연구의 결과는 동해안 하구부에 위피한 하천의 다양한 변화 해석시 참고자료로 활용할 수 있을 것으로 사료된다.

• Korean Journal of School Psychology
• /
• v.8 no.3
• /
• pp.379-403
• /
• 2011

This study examined coping strategies and perceived changes of the Chinese international students in South Korea. A total of 56 Chinese students participated and data was analyzed using the concept mapping method. The results showed that Chinese international students adopted developing language proficiency and using social networks as important coping strategies. They also perceived a wide range of changes including changes in the cultural and personal self. However, the perception of these coping strategies and changes differed by the length of stay. Chinese international students who stayed longer reported using specific coping strategies for mood regulation, which was distinctive from the coping strategies used by students who stayed for a shorter period of time. Students who stayed longer perceived negative changes as well as positive changes, while students who stayed for a shorter period reported predominantly positive changes. The findings indicate that university staff needs to understand and sensitively respond to the distinctive experiences of Chinese international students which vary across time.

• Economic and Environmental Geology
• /
• v.24 no.3
• /
• pp.233-244
• /
• 1991

A biotite that substantially altered to chlorite and vermiculite in hornblende gneiss from Cheonyang, Korea, has been investigated with electron microprobe analysis. The data show the general variational trends of Ti and K-leaching with increased weathering. However, the chloritization is characterized by Si- conservative reaction and relatively dramatic increase of Al-for-(Fe+Mg) octahedral substitution, whereas the vermiculitization is characterized by total Mg-conservative and Ca-enriching exchange reaction. In the initiating stage the vermiculitization proceeded in a continuous decrease of the Al-for-Si tetrahedral substitution and an increase of the Al-for-(Fe+Mg) octahedral substitution, supporting the currently accepted weathering process. But it differs in the late stage, in which AI(IV) and Fe increase significantly. Recalculations of the structural formular for vermiculite on the basis of several assumptions indicate that the oxidation of Fe is necessary for vermiculite to form the reasonable strutural formular. The relative timing of the oxidation of Fe probably occurs in the late stage, supported by the substantial increase of the Al-for-Si tetrahedral substitution.

• Journal of Climate Change Research
• /
• v.6 no.3
• /
• pp.209-221
• /
• 2015

Temperature is one of the most important factors affecting crop growth. The diurnal cycle of the scale factor [Tsc] for air temperature and the surface temperature of crop leaf and soil could be estimated by the following equation : $[Tsc]=0.5{\times}sin(X+C)+0.5$. The daily air temperature (E[Ti]) according to the E&E time [X] can be estimated by following equation using average (Tavg), maximum (Tm) and minimum (Tn) temperature : $E[Ti]=Tn+(Tm-Tn){\times}[0.5{\times}sin\;\{X+(9.646Tavg+703.65)\}+0.5]$. The crop leaf temperature in 24th June 2014 was high as the order of red pepper without mulching > red pepper with mulching > soybean under drought > soybean with irrigation > Chinese cabbage. The case in estimating crop leaf surface temperature using air temperature and soil surface temperature was lower in the deviation compared to the case using air temperature for Chinese cabbage and red pepper. These results can be utilized for the crop models as input data with estimation.

• KOREAN POULTRY JOURNAL
• /
• v.22 no.3 s.245
• /
• pp.56-63
• /
• 1990

• Korean Journal of Ecology and Environment
• /
• v.51 no.4
• /
• pp.354-364
• /
• 2018

In this study, we surveyed the fish community at the four sites(St. 1, 3, 5, 7) in Jungrang Stream from 2008 to 2016. We found 37 species grouped into nine families. There were three exotic species; Cyprinus carpio, Carassius cuvieri and Micropterus salmoides after rainfall. Dominant species was Zacco platypus (57.3%) and subdominant species was Carassius auratus(10.4%) in a community. The water quality, surveyed at the six sites(St. 1, 2, 3, 4, 5, 6), based on eight factors(Water temperature, pH, DO, BOD, SS, EC, TN and TP), largely varied depending on each site and period. Minimum values in four factors(BOD, EC, TN and TP) were observed in rainy season, indicating an ionic and nutrient dilution of stream water by precipitation. In contrast, a maximum value in SS was occurred in rainy season at St. 2 and St. 5. The precipitation, Maximum value observed in July ($497.5{\pm}297.2mm$), minimum value in January ($12.9{\pm}8.6mm$). In July and August, the precipitation was divided into before and after the rainfall season in Jungrang stream. Using cluster analysis three fish sites (St. 1, 3, 5) were identified as significantly influence 11 fish species; Hemiculter eigenmanni, Squalidus japonicus coreanus, Hemibarbus labeo, Gnathopogon strigatus, Pungtungia herzi, Rhynchocypris oxycephalus, Pseudogobio esocinus, Pseudorasbora parva, Cyprinus carpio, Carassius auratus and Zacco platypus by rainfall.