• Horticultural Science & Technology
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• v.28 no.6
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• pp.937-941
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• 2010

This study investigated the effect of global warming on full bloom date (FBD) of 'Niitaka' pear ($Pyrus$ $pyrifolia$ Nakai) tree by calculating the development stage index by hourly temperatures recorded at Pear Research Station, estimating the distribution of average FBD and the change of FBD according to temperature rising by integrating development rate at 67 locations in Korea Meteorological Administration site. Development stage index of 'Niitaka' pear tree was 0.9593 at Naju location. Differences between full bloom dates observed at Cheonan region and predictions by development stage index were 0-7 days, and matched year was 35.3%. FBDs of 67 locations were distributed from April 4 to May 28. When yearly temperature was raised 1, 2, 3, 4, and $5^{\circ}C$ at 67 locations, predicted FBD was accelerated at most of the locations. However, FBD decelerated at south coast locations from $3^{\circ}C$ rise and did not bloom at 'Gosan', 'Seogwipo', and 'Jeju' locations from $4^{\circ}C$ rise. When monthly temperature was raised 1, 3, and $5^{\circ}C$ at 67 locations, predicted FBD was the most accelerated at March temperature rise, and followed by April, February, January and December. Therefore, global warming will cause acceleration of the full bloom date at pear production areas in Korea.

• Korean Journal of Environment and Ecology
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• v.16 no.1
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• pp.46-54
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• 2002

This study was conducted to diagnose the health of street trees with physiological characters, and to figure out the relation of physiological characters and cambial electrical resistances. Ginkgo biloba, Prunes serrulata and Salix koreensis were chosen in the Cheonan City. Soils under trees were collected to analyze dehydrogenase activities, and chlorophyll content, nitrate reductase and superoxide dismutase activities were analyzed from leaves sampled at the edge of crown in July. Cambial electrical resistances were measured in May, July and September, Soils with low dehydrogenase activity reflected the level of pollution. Chlorophyll content was the lowest in the leaves of P. serrulata at the Dongseo-street. Nitrate reductase activity of Ginkgo biloba was higher than P. serruluta and Satix koreensis. Nitrate reductase activity showed higher activity in the city than control(Independence Hall and Yonam College), but superoxide dismutase activity in the city lower than control. P. serruzatu in the Dongseo-street that cambial electrical resistance increase continuously during the growing season, showed the loss of vitality Cambial electrical resistance was negatively or positively correlated with nitrate reductase($r^2$=-0.566) and superoxide dismutase activity($r^2$=0.579). It was concluded that cambial electrical resistance might be suitable for diagnosing the tree health.

• Journal of Korean Society for Geospatial Information Science
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• v.9 no.1 s.17
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• pp.49-57
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• 2001

One of the biggest problems found from the results of the various GIS-related projects which have been fulfilled by many local self-governing bodies is as follows. Many GIS projects have been undertaken without the proper review on National Standards on GIS, the information master plans for the development of the municipalities, and the GIS master plans which should be followed by the former ones with the relatively detailed implementation planning. Because these projects were to be done at most with little considerations of the formerly mentioned materials such as vision, goals, strategies, and the implementation planning, it is quite doubtful that a GIS project could play a proper role as an element in the integrated information system. As an effort to solve this problem, this paper first analyzes the types of the GIS projects done by many municipalities, proposes a recommended procedure for a life cycle of a GIS project and for a GIS master plan based on the information master plan for a municipality.

• Journal of Korea Water Resources Association
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• v.34 no.1
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• pp.3-17
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• 2001

The purpose of this study is to understand applicabilities of sediment yield estimation technique with observed data in the field accelerated by human activity. Commonly used equations such as Universal Soil Loss Equation and Transport Research Board etc. from foreign country is not validated. And analyzing affecting parameters and understanding limit of each estimation technique is not examined, either. To test the applicabilities of several models, a hot spring development site in Chunahn city, Chungnam province is selected. Sediment yield of catchment is determined using RVSLE, TRB, MUSLE, SLEMA, and Morgan & Finned method and compared to actual measurement. It is found that RUSLE and TRB are overestimated and MUSLE dives a rotatively resonable value.

• Journal of Conservation Science
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• v.12 no.1 s.15
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• pp.31-47
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• 2003

The stone implements from the Unjeonri relic sites were studied on the basis of petrology, geochemistry and archaeogeological interpretations. Magnetic susceptibility (MS) of the stone implements were mainly lest than 0.5 $(10^{-3}\;SI\;unit)$, however, stone axe of syenitic rock (2.37), stone axe of schist (0.19) and stone knife of slate (0.11) showed different from the some measured rocks of an outcrop. Geochemical evolution trend of both a stone implement and the surface rock were identical when it a normalization to use the behavior, enrichment, compatibility and incompatibility of the elements. But, some rocks of a axe (schist), a knife (slate), a arrowhead (shale) could not confirm typical occurrence and the distribution area within the Unjeonri site and a radius 10 km. In the Unjeonri site, the stone implements suggest that coexisting two types as domestic- and foreign-type lithic artifacts.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.12
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• pp.5165-5176
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• 2010

This study is an attempt to seek ways to revitalize the main streets in local city with regard to urban regeneration. It focuses on the case of Myeong-dong Fashion Street located in front of Cheonan Station, which recently lost its vitality. In order to explore causes of the decline and solutions for restore, this paper investigate the concerned urban area by approaching through three different aspects: physical and environmental aspects, social and economic aspects, historic and cultural aspects. In addition, the street visitors were surveyed on their visiting patterns, priorities and discontents about the components of street, and preferences for its restoring, etc. The investigation resulted in following findings and proposals. In physical and environmental dimension, it is needed to create legal incentives for encouraging local residents to develop their own district, and suggested to plan green space for relaxation and cultural arts space by using existing buildings, along with the expansion of public parking. In regard of social economic aspects, it is proposed to give each street specialized commercial theme. At the historic and cultural level, it is suggested to plan the pedestrian network which links the Fashion Street with surrounding historic elements.

• The Journal of the Korea Contents Association
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• v.12 no.4
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• pp.245-262
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• 2012

The purpose of this study is to find out the differences in personality traits and preparation level of the baby boomers for the old age by the demographic factors and to analyze the effect of Big 5 on preparation for the old age. The 331 questionnaires were distributed among workers born in 1955 to 1963 in the Chunan industrial complex. And the frequency analysis, factor analysis, reliability analysis, t-test, ANOVA, hierarchical regression analysis for the collected data were conducted with program SPSS 18.0 The findings are as follows. First, there is a partial difference in personality and preparation for the old age by the demographic factors. Second, extraversion, openness to experience and conscientiousness from personality have a positive effect on physical preparation for the old age while neuroticism has a negative effect on it. And there is no relationship between agreeableness and personality. Third, conscientiousness, openness to experience and extraversion have a positive effect on social preparation for the old age, but neuroticism and agreeableness do no affect it. Fourth, neuroticism,extraversion,openness to experience and conscientiousness have a positive effect on economic preparation for the old age, but agreeableness does not have any relationship with economic preparation.

• Journal of The Korean Society of Grassland and Forage Science
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• v.35 no.4
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• pp.297-302
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• 2015

This experiment was conducted to evaluate the agronomic characteristics and forage production of Italian ryegrass cultivars at three locations (Gurae, Sungju and Cheonan) from 2013 to 2014. The experiment employed a randomized complete block design with three replications. The seven cultivars used in this experiment were 'Korwinearly', 'Florida80', 'YounbongI', 'YounbongII', 'YounbongIII', 'KeimyungI' and 'KeimyungII' varieties. Italian ryegrass varieties were seeded on October 4 at Gurae, October 8 at Seongju and October 3 at Cheonan in 2013. The Italian ryegrass varieties were harvested on April 26 at Gurae and Seongju, and on April 24 at Cheonan in 2014. Although the seven cultivars had resistance to foliar diseases and insects and high winter survival, they has little lodging resistance. The heading dates for 'Younbong I', 'Younbong II' and 'Keimyung I' were earlier than for other varieties at the three locations. Dry matter (DM) content and plant height in the early maturing cultivars were higher than in other cultivars at the three locations. The fresh and DM yields of the early maturing cultivars were also higher than others at the three locations. The results of this experiment indicate that the heading date for early maturing cultivars is earlier, and the plant height is higher than for other cultivars. Early maturing cultivars had higher DM content as well as fresh and DM yields of Italian ryegrass. Therefore, early maturing cultivars should be recommended as high-yield forage in double-cropping systems because of their superior production of forage and early heading date.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2002.09a
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• pp.265-268
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• 2002

경상북도 고령군 다산면, 천안시 풍세면 삼태리 및 부여 정동ㆍ자왕 지역의 장기수위관측 데이터 및 강수, 대기압 자료의 시계열 분석을 통하여 대수층의 함양특성 및 특히, 대기압에 대한 지하수위 변화 특성을 통한 대수층의 특성(properties) 유추 가능 여부를 보고자 하였다. 하천에 인접한 자왕지구의 경우 자기상관분석에 의하면 다른 세 지역에 비해 데이터 값이 안정적이지 못하며, 대기압 변화에 대한 상관분석에서도 낮은 상관성을 나타낸다. 강수에 대한 함양 특성을 상호상관분석을 통해 해 보았으나, 강설에 의한 영향인지 대체적인 지연시간이 길게 나타났다. 차후 장기적인 데이터 수집 및 분석을 통해 좀 더 정확한 대수층 특성을 밝히고자 한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.756-760
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• 2007

삽교천 홍수예보시스템은 1999년에 개발되어 현재까지 운영되고 있으나, 개발 이후 유역특성의 변화를 반영한 모형 개선이 이루어지지 않았고, 삽교천 하구둑의 영향을 고려한 모형은 개발되어 있지 않은 실정이다. 이 지역 중에서 특히 천안/아산지역은 급격한 인구증가와 산업화 및 도시화에 의해 면적당 자산의 고도화가 증가하며, 이에 따라 홍수시 피해잠재능은 점점 증가하고 있는 상황이다. 또한, 하구둑의 영향을 고려한 모형을 개발하여 정확한 홍수예보를 위한 전산시스템의 개선자료를 제공할 필요가 있다. 따라서 삽교천 하구둑에 의한 배수영향을 고려하기 위해 FLDWAV모형을 이용하고, 삽교천 하구둑 수문조작에 따른 내수위(하류경계 조건)를 예측하는 모형을 개발하여 하구둑 운영을 고려한 연계모형을 개발하였다. 향후 설치될 우강지점에 대한 수위자료가 구축되면 예측의 정확도를 검증할 수 있으며, 홍수예보시 정확성을 높일 수 있을 것이다.