• Korean Journal of Environmental Agriculture
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• v.38 no.3
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• pp.154-158
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• 2019

BACKGROUND: 'Shiranuhi' mandarin is a major cultivar among all late ripening type of citrus, and is widely cultivated in Korea. However, many farmers have reported scion root problems in their orchard resulting in reduced flowering and fruiting. It is necessary that the physiology of scion-rooted 'Shiranuhi' mandarin trees is further understood. METHODS AND RESULTS: This experiment was conducted to understand the growth response and physiology of scion-rooted 'Shiranuhi' mandarin hybrids. In our study, 'Shiranuhi' mandarin trees were divided into two groups: trees without scion roots (control) and trees with scion roots. The experiment was conducted in Seogwipo of Jeju, with ten replicates for each group. Growth of trees with scion roots was more vigorous and the trees were taller than the controls. Tree height and trunk diameter of scion-rooted trees were significantly higher than those of control trees. Exposed length of rootstocks of scion-rooted trees was significantly lower (by about 2 cm) than that of control trees (8.6 cm). In terms of root nutrition, carbon contents of scion-rooted trees was significantly lower than that of control trees, but nitrogen and potassium concentrations in scion roots were significantly higher than those in control roots. CONCLUSION: Based on the results, we infer that growth of scion-rooted trees was very vigorous and the content of nitrogen in these roots was higher than that in the control tree roots. Thus, the carbon/nitrogen ratio of scion roots was significantly lower than that of the control roots.

• Journal of the Korea Convergence Society
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• v.10 no.8
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• pp.335-344
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• 2019

This study is a descriptive research to measure the awareness and attitude toward withdrawal of life-sustaining medical treatment (WLSMT) among medical and nursing students. The data collection was conducted between 8 October and 15 November 2018, and the responses of 240 students were analyzed. The analysis results are as follows. More than 95 percent of medical and nursing students said the WLSMT was necessary. The medical students answered that 'patient's will' is important and nursing student answered that 'patient and family's will' is important. The nursing student showed that "family will and decision" was more important than the medical student in deciding to discontinue life care. Based on the results of the study, continuous discussion on the development and application of education programs to form attitudes and awareness of the discontinuation of life-saving treatments based on correct values is needed for prospective medical students and nursing students.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.393-393
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• 2016

자갈하천 만곡부에서 하상의 세굴심을 파악하는 것은 하천의 수공구조물 안전설계를 위해 고려할 중요한 요소이다. 모래하천에서 만곡부의 국부세굴에 대한 연구는 활발하게 이루어지고 있으나 자갈하천 만곡부의 세굴심에 대한 연구는 부족한 실정이다. 만곡부 세굴심은 하천경사, 하상재료, 유로형태 등에 따라서 다르다. 따라서 하천 만곡부의 세굴심을 산정하기 위한 공식들은 지배적인 독립변수로 사용되고 있는 유량, 유속 또는 Froude수, 수심, 하상재료의 직경 등에 따라 분류할 수 있다. 세굴심과 단위폭당 유량의 관계는 Lacey (1930), Abbott (1963), Blench (1969), Neill (1973)의 공식이 있다. 만곡부에 접근하는 상류부에서 Froude 수와 만곡부의 세굴심의 관계는 Liu et. al (1961), Zeller (1981), Mussetter (1994)의 공식이 있다. 또한 만곡부의 수심-세굴심 또는 하상재료의 직경과 세굴심의 관계를 나타내는 공식이 USBR, USACE, FHA 등에서 사용되고 있다. 하상재료와 세굴의 관계공식은 하천 만곡부에서 세굴심은 하상재료에 따라 발생될 수 있는 최대 크기가 정해져 있다고 본 것이다. 하상재료는 하천의 유사이송능력과 유역의 유사공급능력을 반영하기 때문에 하천의 수리특성을 나타낼 수 있는 변수이나 하상재료의 평균입경 특성에 영향을 미치는 수리학적인 요인들이 너무 많고 간접적이라는 한계가 있다. 자갈하상 하천에서 Mussetter, Liu, Abbott 공식은 세굴발생에 대한 한계조건을 반영하지 못하고 대부분 세굴심을 과대 추정한다. 자갈하천에서 Zeller 및 Lacey 공식과 USACE 방법에 의한 세굴심은 적용성이 있다고 볼 수 있는 유량조건이 있다. 이같이 대부분 세굴심 공식이 모래하천에서 개발되었기 때문에 자갈하천의 만곡부 세굴심을 산정하기 위해서는 하상재료의 특성이 반영되어야 한다.

• Atmosphere
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• v.33 no.2
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• pp.275-295
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• 2023

In Korea, there are four institutions related to atmospheric science: the university's atmospheric science-related department, the Korea Meteorological Administration (KMA), the ROK Air Force Weather Group, and the Meteorological Industry Association. These four institutions have developed while maintaining a deep cooperative relationship with the Korea Meteorological Society (KMS) for the past 60 years. At the university, 6,986 bachelors, 1,595 masters, and 505 doctors, who are experts in meteorology and climate, have been accredited by 2022 at 7 universities related to atmospheric science. The KMA is carrying out national meteorological tasks to protect people's lives and property and foster the meteorological industry. The ROK Air Force Weather Group is in charge of military meteorological work, and is building an artificial intelligence and space weather support system through cooperation with universities, the KMA, and the KMS. Although the Meteorological Industry Association has a short history, its members, sales, and the number of employees are steadily increasing. The KMS greatly contributed to raising the national meteorological service to the level of advanced countries by supporting the development of universities, the KMA, the Air Force Meteorological Agency, and the Meteorological Industry Association.

• Journal of Korean Society for Geospatial Information Science
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• v.14 no.2 s.36
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• pp.89-94
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• 2006

Forest damage is a worldwide issue and specially, a forest fire involves damage to itself and causes secondary damage such as a flood etc. However, actually, clear analysis on forest fire damage can be hardly conducted due to difficulty in approaching a forest fire and quite a long period of time for analysis. To overcome such difficulty, recently, forest fire damage has been actively investigated with satellite image data, but it is also difficult to obtain satellite image data fitted to the time a forest fire occurred. In addition, it is burdensome to verify accuracy of the obtained image. Therefore, this study was attempted to look into the damaged districts from forest fires by reference to spectroradiometric characteristics of the obtained vegetation with a spectroradiometer as preliminary work to use satellite image data. To begin with, the researcher analyzed the field survey data each measured 3 months and 6 months after occurrence of a forest fire by judging the extent of the damage through visual observation and using a spectroradiometer in order to investigate any potential errors arising out of one-time visual observation. Besides, in this study, groups showing possibilities that trees might be restored to life and wither to death could be classified on the sampling points where forest fire damage is minor.