• Journal of Korean Society of Environmental Engineers
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• v.28 no.2
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• pp.117-127
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• 2006

Recently International Water Association(IWA) has proposed new performance indicators for water supply services and their successful applications are being reported continually. According to the various reports, the percentage indicators were suggested not to be used for performance comparison, especially where the targeted areas have great difference in consumption per service connection. But unfortunately in Korea the revenue water ratio, one of the percentage indicators is still being used to set up the goal of water-related administration and to compare the performances between systems. Therefore this study aimed to prove the inapplicability of the percentage indicators with nation-wide data and to suggest better performance indicators for more efficient water loss management. According to the result of the comparison of various performance indicators with conventional one, it is roved that percentage indicators ca not evaluate the performance efficiently where the local situations are significantly different. It is suggested that the better performance indicators such as real losses per service connection or ILI should be used to benchmark the performances of water suppliers on water loss management so thai the problems of water losses could be identified easily and recovered effectively.

• Korean Journal of Soil Science and Fertilizer
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• v.4 no.2
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• pp.155-159
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• 1971

1. Based upon an fertilizer experiment done in a farmer's field, with a medium maturity variety, Jinheung, (in 1969) a method of determination of nitrogen to be additionally given, at tillering and reproductive stages was studied. In this experiment, four kilograms of nitrogen per 0.1 ha was applied as basal dressing to all experimental treatments at transplanting time. 2. The application of nitrogen at the reproductive stage of paddy increased the yield remarkably and cut down the amount of nitrogen to be given at the tillering stage. The yield of paddy, 670kg/0.1 ha obtained by the application of 6.82kg N/0.1 ha at the reproductive stage far exceeded the yield, 644kg/0.1ha obtained when over 8kg N/0.1ha of N is applied at tillering stage alone. This emphasizes the importance of nitrogen top dressing at the reproductive stage. 3. As the amount of nitrogen to be given at both stages, reproductive and tillering, would be the reflection of soil fertility of the field, a correlative study between the amount of nitrogen to be given at both stages and soil analysis is suggested to be undertaken. 4. A study on the relationship between the amount of fertilizer to be given at stages different growth and yield components is suggested to be undertaken for the purpose of establishing a better fertilizer use technique.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.61 no.2
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• pp.87-91
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• 2016

Recently, rice growth and production have been influenced by climatic change worldwide. In particular, under low solar radiation and cloudy weather, rice plants show abnormal physiological responses. In this experiment, plants of the rice cultivar Samgwangbyeo grown 40% and 70% shading and natural conditions at the primordium initiation stage (PI) for 30 days and the booting stage for 10 days up to heading were compared. After shading treatments, culm lengths were significnatly longer than that in natural condition plots, and panicle lengths were shorter in the 40% and 70% shading treatment plots compared to control plots. After heading, the production of dry matter treated at the PI stage was significantly lower than that at the booting stage. SPAD values of the leaf color and N concentration of leaves treated with shading were greater than those under natural conditions. In the shading treatment, the lodging index at 20 days after heading was significantly higher than that in natural condition. For yield components, number of panicles, spikelet number per panicle, and ripened grain ratio significantly decreased with shading treatment; thus, rice yield decreased significantly. For rice quality, the protein content of the head rice treated with shading was significantly higher than that in the control plot, but the amylose content of rice treated with shading was signifiantly lower than that in rice in control plots.

• Journal of the Korean Society of Child Welfare
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• no.58
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• pp.231-262
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• 2017

South Korea has long been a culturally homogenous society, yet the increasing number of immigrants has turned the country into a multicultural society. Therefore, many empirical studies have investigated the way immigrants adapt to the Korean society and its associated factors. However, examining the overall process of migration (from family separation to reunification and cultural adaptation to the host society) that immigrant youth usually experience has been understudied. Previous empirical research and theoretical work have identified prominent factors that predict immigrant youth's mental health: experiences of family separation, living with others rather than primary caretakers during the separation, the length of residency in the host society, and family and peer support. In this respect, this exploratory and preliminary study that examined whether the experience of migration process and post-migration are related to Korean immigrant youth's mental health problems (depression, anxiety, and suicidal ideation). The result indicated that longer duration of family separation; living with relatives, siblings; and friends rather than primary caretakers during the separation; receiving less support from family and peer after migration; and a lower degree of cultural adaptation to Korean culture were associated with depression, anxiety, and suicidal ideation. Drawing upon the results, this study discussed implications for policy and practice.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.31 no.3
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• pp.375-382
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• 1986

This study was carried out to obtain the basic information for the clarification of spring growth habits mechanism of naked barleys. The isozyme patterns and activities of peroxidase in the young spike and leaf blade were analyzed during the differentiation and development of young spike. The characteristic differences between the normal and rosetted type were in c and g isozymes in young spike, and in i isozyme in the leaf blade. In the normal type, c and i isozymes disappeared at the stage of spi-kelet differentiation, g isozyme at the stage of flolet differentiation. But, in the rosetted type, those three isozymes remained in dark stained condition until the time of final sampling. Especially, those three isozymes were higher in the rosetted type than those in the normal type even at the stage of bract differentiation(BDS), just prior to the reproductive stage. The activities of peroxidase decreased slowly after BDS in the young spike and leaf blade in the normal type, While, in the rosetted type, increased linearly, and the degree of increasing was remarkable in the young spike. It was interesting that the degree of activities in young spike was higher in the rosetted type than that in the normal type even at BDS. From the above results, the remarkable differences of the isozyme patterns and activities at BDS between the normal and rosetted type were considered to be the physiological expression of the varieties concerned with the degree of spring growth habits.

• 수도
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• s.62
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• pp.39-53
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• 1993

• Aerospace Industry
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• v.39
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• pp.56-59
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• 1996

• Ingenium
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• v.1 no.2
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• pp.54-59
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• 1994

• 정보통신주요정책설명회
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• s.2007
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• pp.39-73
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• 2007

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2003.05a
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• pp.41-44
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• 2003