• Title/Summary/Keyword: Region extension

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Occurrence status of three major insect pests in orchards in Chungbuk province from 2021 to 2022 (2021~2022년 충북지역 과수원의 주요 해충 3종 발생 현황)

  • Seongkyun Lee;Wonki Park;Song Yun;Jonghyun Ahn;Eunsol Yeon;Jongok Jeon;Juhyung Kim
    • Korean Journal of Environmental Biology
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    • v.41 no.4
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    • pp.519-529
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    • 2023

  • The occurrence of eggs and adults of Pochazia shantungensis, Lycorma delicatula, and Lymantria dispar was investigated in 11 cities in the Chungcheongbukdo region. The results showed that the overwintering eggs of P. shantungensis occurred in 24.2% of the region in 2021 and 22.1% in 2022, while adults occurred in 25.2% in 2021 and 24.3% in 2022, indicating the highest occurrence among the pests studied. The occurrence of overwintering eggs of L. delicatula was relatively low, with 2.6% of the region affected in 2021 and 1.9% in 2022. Adult L. delicatula occurred in 3.2% of the region in 2021 and 3.6% in 2022. Overwintering eggs of L. dispar occurred in 4.1% of the area in 2021 and 1.7% in 2022, showing a decreasing tendency compared to the previous year, and their occurrence was only low to middle in terms of the degree of occurrence. Adult L. dispar occurred in 4.6% of the region in 2021 and 2.7% in 2022, showing occurrences that were insignificant compared to L. delicatula. According to a survey of host preferences, both the wintering eggs and adults of P. shantungensis were found in apples and peaches between 2021 and 2022. In both 2021-2022, adult L. delicatula had a high incidence in peaches, apples, and grapes, and winter eggs were the highest in grapes. However, the incidence in apples and peaches was low. A high incidence density of L. dispar moth adults and overwintering eggs was found in apples in both 2021 and 2022.

  • https://doi.org/10.11626/KJEB.2023.41.4.519 인용 PDF

A Study on the Countermeasures of Agricultural Extension Service Agencies by Reorganization of Local Administrative System (지방행정체계 개편에 따른 농촌지도조직의 대응방안 연구)

  • Yoon, Eui-Young
    • Journal of Agricultural Extension & Community Development
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    • v.16 no.1
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    • pp.21-49
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    • 2009

  • There is a wide range of agreement for reorganization of administrative units. It is expected that regionalization of city governments and city-county consolidation would contribute to enhance efficiency of extension services and weaken citizen accessibility, responsiveness, and participation. Therefore, it is suggested that branch office of extension center should be provided to the isolated rural areas in order to maintain the appropriate level of services. Also, the relationship and linkage between the national/regional government and local extension centers should be reshaped by making current linkage system such as monthly Provincial Meeting and central-local association more effective. Establishment of agricultural database of each local region is needed to strengthen local extension center's role. Finally, extension service agency needs to consider to expand its function from the traditional extension services to a variety of 'rural issues.'

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A Study on Contact Resistance of the Nano-Scale MOSFET (Nano-Scale MOSFET 소자의 Contact Resistance에 대한 연구)

  • 이준하;이흥주
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.5 no.1
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    • pp.13-15
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    • 2004

  • The current driven in an MOSFET is limited by the intrinsic channel resistance. All the other parasitic elements in a device structure play a significant role and degrade the device performance. These other resistances need to be less than 15％ of the channel resistance. To achieve the requirements, we should investigate the methodology of separation and quantification of those resistances. In this paper, we developed the extraction method of resistances using calibrated TCAD simulation. The resistance of the extension region is also partially determined by the formation of a surface accumulation region that forms under the gate in the tail region of the extension profile. This resistance is strongly affected by the abruptness of the extension profile because the steeper the profile is, the shorter this accumulation region will be.

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ON THE CONSTRUCTION OF A SURFACE FROM DISCRETE DERIVATIVE DATA AND ITS EXTENDED SURFACE USING THE LEAST SQUARES METHOD

  • Kim, Hoi-Sub
    • Journal of applied mathematics & informatics
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    • v.4 no.2
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    • pp.387-396
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    • 1997

  • For given discrete derivative data in a rectangular re-gion we propose a method to generate an approximated surface which fits the given derivative data in the region and extends smoothly to a sufficiently large rectangular region. Such an extension in nec-essary in the generation of the surface in NC(numerical control) ma-chine.