• Korean Journal of Remote Sensing
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• v.37 no.5_1
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• pp.917-926
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• 2021

Lodging rice is one of critical agro-meteorological disasters. In this study, the UAV-based multispectral imageries before and after rice lodging in rice paddy field of Jeollanamdo agricultural research and extension servicesin 2020 was analyzed. The UAV imagery on 14th Aug. includesthe paddy rice without any damage. However, 4th and 19th Sep. showed the area of rice lodging. Multispectral camera of 10 bands from 444 nm to 842 nm was used. At the area of restoration work against lodging rice, the reflectance from 531 nm to 842 nm were decreased in comparison to un-lodging rice. At the area of lodging rice, the reflectance of around 668 nm had small increases. Further, the blue and NIR (Near-Infrared) wavelength had larger. However, according to the types of lodging, the change of reflectance was different. The NDVI (Normalized Difference Vegetation Index) and NDRE (Normalized Difference Red Edge) shows dome sensitivities to lodging rice, but they were different to types of lodging. These results will be useful to make algorithm to detect the area of lodging rice using a UAV.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.9 no.3
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• pp.137-152
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• 2004

The climatological characteristics of coastal zone over the southwestern coast of Korea peninsula were investigated using the data observed by AWS (automatic weather system) and 4 buoy points. Coastal zone is climatologically defined as the region bounded by the distinct contrast of temperature gradient and wind speed across coastline. In the southwest of peninsula four cross-lines consisted of AWS aligned with each buoy were selected as Geojedo buoy line, Geomundo buoy line, Chilbaldo buoy line and Dukjukdo buoy line. Analysis on the diurnal cycle and intra-month variation, monthly mean and maximum value, the temperature gradient with distance between buoy and each station and the accumulative frequency of wind speed were applied to find out the characteristics and the range of coast zone. The maximum ranges of coastal zone vary from offshore to Sanglim (about 34 km distance from coastline) for Geojedo buoy line, to Sunchun (about 52 km) for Geo-mundo buoy line, to Jaeundo (about 27 km) for chilbaldo buoy line and to Yongin (about 65 km) for Dukjukdo buoy line. The modification of coastal zone according to synoptic flow was investigated for the onshore, off-shore and calm cases. The ranges of coastal zone are significantly changed with the distance between 65∼90 km for the case of onshore. In addition, we tried to find out the variation of the wind and temperature and the wind ratio of wind speed at ocean to land stations along Geojedo buoy line during 12∼13 Sep. 2003 affected by typhoon (MAEMI).

• Journal of the Korean Society of Environmental Restoration Technology
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• v.14 no.1
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• pp.67-76
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• 2011

도시화로 인해 도심지와 도시외곽간의 기온차가 더욱 심해지는 열섬현상은 폭염과 더불어 도시민의 쾌적한 삶을 저해하는 요소로 작용하여 이를 저감하기 위한 노력이 시행되고 있다. 도시 기온은 도시의 지형적 특성, 도시 수체의 규모와 위치 등에 의해 영향을 받고 있는 것으로 알려져 있어 도시외곽에 산림이 존재하는 도시에서는 이들 지역과 도심지와의 기온차이를 측정하여 바람길을 이용한 기후응용도시계획에 활용할 필요가 있다. 허나, 아직 국내에서는 이들 기온 차에 대한 특성을 조사한 연구가 많지 않다. 이를 위해 본 연구에서는 서울시 강남 지역을 대상으로 도심지 상업업무중심지구 두 곳(GNS, SLS)과 도시외곽 산기슭 마을 두 곳(YGD, GPT) 간의 기온 차를 2008년 4월 14일부터 2009년 4월 13일까지 1년간 관측한 자료를 대상으로 일 변동, 계절별 변동을 비교, 분석하였다. 분석결과 관측 기간 동안 YGD는 연평균기온이 GNS보다 $2.8^{\circ}C$ 낮았으며 열대야는 GNS, SLS가 16일인데 비해 GPT는 2일, YGD는 하루도 관측되지 않아 도시외곽의 산림이 도시기온 저감효과가 있음을 확인하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.74-78
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• 2009

우리 사회가 발전함에 따라 재해의 위험으로부터도 안전하게 살고자 하는 대중들의 욕구 또한 증가하고 있다. 하지만 최근의 기후변화와 이상홍수의 사례에서 볼 때 현재 우리가 처해 있는 자연재해로부터의 위협은 과거와는 상이하다는 것을 알 수 있다. 이러한 위협에 대처하기 위해서는 우리에게 노출된 재해의 특성을 평가하는 과정이 무엇보다 선행되어져야 한다. 홍수로 인한 피해는 대부분이 인명이나 재산피해가 주를 이루기 때문에 홍수위험도의 평가결과도 발생 가능한 인명이나 재산피해로 표현되는 것이 적절하다고 판단된다. 따라서 본 연구에서는 지역회귀분석을 적용하여 가능 홍수 피해금액을 추산하고, 이를 통해 각 지역별 홍수위험도를 평가하는 방법을 제안하였다. 지역회귀분석은 강우유출모형이나 확률분포모형의 매개변수들을 유역 특성인자들로 표현하기 위해 수문학 분야에서 사용되어져 왔으며 본 연구에서는 이 방법을 홍수 피해금액 추정에 응용하였다. 지역회귀방법의 절차는 먼저 계측지역에서는 홍수 피해금액과 시강우량 자료를 바탕으로 비선형회귀분석을 실시한 후 이 회귀식의 계수를 다시 해당 지역의 인문 사회 경제학적 인자들로 표현하였다. 이러한 방법을 통해 지역적 인자들이 홍수 피해에 미치는 영향을 정량적으로 분석할 수 있었으며 궁극적으로 미계측지역에서도 지역적 인자들을 통해 특정 빈도에 발생 가능한 홍수 피해금액을 추정할 수 있었다. 최종적으로 추정된 홍수 피해금액과 지역 총 자산의 비를 통해 홍수위험지도를 작성하였다. 본 연구결과를 수자원장기종합계획에서 홍수위험도 평가를 위해 사용된 홍수피해잠재능(Potential Flood Damage; PFD)과 비교해 보면 PFD에서는 각 인자들의 가중치 산정에서 전문가의 주관이 개입될 수 있다는 단점이 있었으나 과거 피해금액과의 상관관계를 분석한 본 연구에서는 이러한 단점을 극복할 수 있었다.

• Journal of Korean Society for Geospatial Information Science
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• v.11 no.3 s.26
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• pp.35-40
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• 2003

In these days, damages from localized heavy rain or typhoon are increase and people are making constant effort to work out countermeasures. Especially, by apply GIS with prompt extraction of information and objective analysis, we could demonstrate more effectively. For that reason, in this research we make the connection between rainfall-runoff model and HEC-RAS which calculate automatically and inquire out the dangerous zone easier way by describing the result with the connection between the Map Object and MFC. Most of all, this research will be very useful to forecast and prepare the disaster because it could plot plane figures, longitudinal sections and cross sections at the same time to help understand the damaged situation.

• Korean journal of applied entomology
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• v.47 no.3
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• pp.209-216
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• 2008

In order to find phenological change of butterflies due to global warming, we analyzed weekly monitoring data of butterfly at Gwangneung forest in 1958 and 2004. It was tested whether the timing of first flight and mean flight of butterflies in 2004 became earlier due to global warming compared with those in 1958 and whether the duration of flight period became longer. No significant difference was found in timing of first flight and in duration of flight period between 1958 and 2004. Furthermore, species showing delayed timing of mean flight was more abundant than species showing earlier timing of mean flight. Hence, the results do not confirm the predicted changes of phonology due to global warming. We discussed reasons on the non-apparent phenological changes despite the increase of temperature, and the problems and solutions in butterfly study on Korean butterfly fauna in utilization of butterflies as indicator for global warming.

• Korean journal of applied entomology
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• v.50 no.3
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• pp.209-214
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• 2011

Changes in insect communities are one of the best indicators of environmental changes. A survey was conducted using the Flight Interception Trap (FIT) method to check the changes of species composition and abundance of silphids at Mt. Sokrisan National Park from April to October in 2003 to 2007. A total of 9,704 individuals of six silphid species were examined by FIT. Among them, Nicrophorus quadripunctatus was the most dominant species with 8,763 (90.3%) individuals. There were only 971 (9.7%) individuals of the other five species. The seasonal abundance of silphids peaked in July and August. The annual abundance has decreased gradually since 2004. Therefore, the changing patterns of species composition and abundance of silphids checked by long-term monitoring could be used as environmental indicators which indirectly show the environmental changes of Mt. Sokrisan National Park.

• Korean journal of applied entomology
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• v.55 no.4
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• pp.359-376
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• 2016

Increase in world trade commodities along with climate change entails frequent pest insect invasions from subtropical to temperate zones. Tephritidae is one of two families in fruit flies along with Drosophilidae and consists of more than 5,000 species. Some tephritid flies in genera Anastrepha, Rhagoletis, Ceratitis, and Bactrocera are highly invasive and give serious economic damages on fruits and vegetables in temperate zones. This review focuses mainly on Bactrocera fruit flies, which have been well studied in control techniques to defend their invasion and colonization. Though various control techniques against Bactrocera fruit flies have been developed, less efforts have been paid to establish efficient integrated pest management (IPM) programs. This review introduces current control techniques of fruit flies and some successful IPM programs implemented in subtropical islands. In addition, major fruit flies infesting crops in Korea have been also reviewed in their occurrence and control programs.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.67 no.4
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• pp.242-252
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• 2022

Soybeans have various applications, and are a major source of proteins, carbohydrates, and fats. As climate warming has accelerated in recent years, this study was conducted to analyze the effect of different sowing periods on component changes in protein, amino acid, and antioxidant contents of various soybean varieties. The isoflavone content of soybeans that were sown early did not differ with the sowing period. Based on the results, only the total isoflavone content was confirmed in functional soybean cultivars such as Cheongja-5, which had blue-colored seeds; Pungsan and Sowon, which used soybean sprouts; and Jinyang, which lacked a fishy smell. There was no significant difference in the changes in protein and amino acid content in soybean cultivars with respect to the sowing time. The protein and amino acid contents in early-sown soybeans tended to be lower than that in timely sown soybeans. In most varieties, the content of proline was the highest in early-sown soybeans, confirming the presence of stress due to early sowing.

• Korean journal of applied entomology
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• v.62 no.3
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• pp.213-214
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• 2023

In a paper reporting the introduction and settlement of Anoplophora horsfieldii (Hope) into Jeju, it was found that Bactrocera dorsalis (Hendel) was misquoted as "it was introduced into the Jeju area and is currently being discovered." Fortunately, the sentence was quickly discovered and corrected to "it has the potential to be introduced to Jeju Island". Taking this as an opportunity, we would like to emphasize to researchers that it is necessary to verify very carefully when describing the domestic distribution of prohibited quarantine pests. Estimating by the cold stress index of the CLIMEX model, B. dorsalis was predicted to be unable to survive in Jeju in the winter of 2022-2023. However, in the winter of 2023, it was confirmed that the occurrence of A. horsfieldii was found to occur in the summer after overwintering at sub-zero temperatures, and it was judged to have succeeded in settling.