• Journal of the Korean Wood Science and Technology
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• v.31 no.5
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• pp.88-95
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• 2003

Five amide alkaloids were isolated from the fruits of Piper nigrum. The structures were determined as : pellitorin (I), quineensine (II), pipercide (III), retrofractamide A (IV), and piperine (V) respectively on the basis of spectrosopic data.

• 산림경영
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• s.41
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• pp.23-24
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• 1989

• Review of Korea Contents Association
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• v.12 no.2
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• pp.73-77
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• 2014

• Journal of Korean Society of Forest Science
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• v.26 no.1
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• pp.67-67
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• 1975

• Journal of Korean Society of Forest Science
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• v.26 no.1
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• pp.68-72
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• 1975

• Journal of Korean Society of Forest Science
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• v.26 no.1
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• pp.72-73
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• 1975

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.6 no.6
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• pp.79-87
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• 1985

• Korean journal of applied entomology
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• v.61 no.3
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• pp.481-496
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• 2022

In order to establish an effective pest control strategy, we investigated the occurrence of lepidopteran insects in the major trees growing in urban forests from 2019 to 2021. In total, we recorded 76 species of 14 families in Prunus spp., 40 species of eight families in Acer spp., 43 species of 10 families in Zelkova serrata, 28 species of seven families in Rhododendron spp., and 10 species of four families in Hibiscus syriacus. Among these, Hyphantria cunea and Lymantria dispar were recorded from all five tree taxa monitored. The most frequently occurring species in the different tree groups were as follows: H. cunea and Phalera flavescens in Prunus yedoensis, Epinotia ulmicola in Z. serrata, and Rehimena surusalis in H. syriacus. H. cunea also occurred in Rhododendron spp. and Acer spp., although the numbers were lower than those recorded in Prunus spp. and Z. serrata. Our results highlight the importance of focusing on the frequency of occurrence of lepidopteran insects in Prunus spp. and Z. serrata, whereas the presence of these insects in both Acer spp. and Rhododendron spp. Appears to be less problematic. From the perspective of reducing the risks to human health, our findings indicate that the application of pheromones for monitoring lepidopteran species and the use of mating disruptors would be desirable approaches that would contribute to minimizing the spraying of pesticides in urban forests.

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2001.06a
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• pp.49-52
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• 2001

산림병해충이란 곤충 중에서 인간이 산림에서 기대하는 혜택을 직ㆍ간접으로 방해하는 것이라 정의 할 수 있는데 특히 소나무재선충이 침입한 나무는 100% 고사되기 때문에 특별한 주의가 필요하다. 소나무는 우리나라의 대표적인 수종으로 1960년대 전국 산림면적의 50%이상을 차지하고 있었으나 최근 산림생태계의 변화, 각종 병해충의 만연으로 소나무 숲의 면적이 30%내로 점차 감소되고 있다.(중략)

• Journal of the Korean Association of Geographic Information Studies
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• v.25 no.4
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• pp.151-162
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• 2022

Recently, the forests in Korea have accumulated damage due to continuous forest disasters, and the need for technologies to monitor forest managements is being issued. The size of the affected area is large terrain, technologies using drones, artificial intelligence, and big data are being studied. In this study, a standard dataset were conducted to develop an algorithm that automatically detects suspicious trees damaged by forest pests using deep learning and drones. Experiments using the YOLO model among object detection algorithm models, the YOLOv4-P7 model showed the highest recall rate of 69.69% and precision of 69.15%. It was confirmed that YOLOv4-P7 should be used as an automatic detection algorithm model for trees suspected of being damaged by forest pests, considering the detection target is an ortho-image with a large image size.