• 식물병연구
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• 제14권1호
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• pp.76-78
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• 2008

포항지역의 부추 연작 장해를 조사하는 중 부추에서는 처음으로 뿌리혹선충의 기생이 발견하여 보고한다. 부추에 기생하는 뿌리혹선충은 Meloidogyne incognita로 동정되었다. 연작 장해지에는 뿌리혹선충, 뿌리응애(Rhizoglyphus sp.), 시들음병(Fusarium oxysporum f. sp. cepae)등이 복합적으로 발생되고 있었지만 발생 빈도와 피해 정도를 보아 연작장해의 주요 원인은 뿌리혹선충이었다.

• International Journal of Industrial Entomology and Biomaterials
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• 제6권2호
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• pp.133-138
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• 2003

Five seed kernel namely, Neem (Azadirachta indica A. Juss.), Pongamia (Pongamia glabra L. Pierre), Tamarind (Tamarindus indica L.), Mahua (Madhuca indica Gmel.) and Shikakai (Acacia cancinna De.) were tested against hatching of eggs and larval mortality of Meloidogyne incognita causing root knot disease in mulberry along with Furadan (Carbofuran) and Bionema (a bioformulation developed from Verticillium chlamydosporium) for comparison. Results revealed that highest hush-up of hatching was observed in Neem (77.40%) and Pongamia (75.99%) seed kernel extracts at 100% concentration over the check. Similarly, highest larval mortality was observed in Neem and Pongamia by 76.00% and 74.50%, respectively at 100% concentration after 72 hrs of exposure period. Pot culture studies revealed that pre-application of seed kernel powders (20 days before inoculation of nematode) found to be more effective in controlling the root knot disease than post application. In pre application of seed kernel powders, maximum reduction of root knots was observed in case of Neem seed kernel powder (54.85%) followed by Pongamia (51.9%). Similar trend was also observed in reduction of egg masses/plant and nematode population ／250 cc soil. Rest of the seed kernel extracts was found to be less effective in suppression of hatching, enhancing the larval mortality and controlling the root knot disease. However, application of Furadan and Bionema tested for the comparison were found to be more effective than seed kernel powders. The generated information seems to be useful in developing an ecofriendly integrated approach for the control of root knot nematode disease in mulberry.

• The Plant Pathology Journal
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• 제34권4호
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• pp.308-315
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• 2018

Root-knot nematodes 'Meloidogyne spp' are the most destructive group of plant parasitic nematodes causeing serious losses in vegetables crops and this damages worsened when crops grown under greenhouses conditions. In this sutdy, the distribution and characterization of root-knot nematode species collected from the Souss region of Morocco where vegetables crops intensively cultivated were determined by using both morphological and molecular tools. Out of the 110 samples collected from different greenhouses 91 (81.7%) were found to be infested with root-knot nematodes. Thirty-seven populations of root-knot nematodes were morphologically identified based on perineal patterns as well as molecularlly using species-specific primers. The obtained results indicated that Meloidogyne javanica and M. incognita were identified in 86.4% and 13.5% of the total populations, respectively. The lowest incidence of root-knot nematodes (64%) was found in Toussous, whereas the highest frequencies of 100% and 90% were detected in Taddart and Biogra, respectively. As the majority of the samples have been infested with Meloidogyne species; this indicates that there is an urgent need to provide farmers with a proper control strategy.

• 한국임상수의학회지
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• 제39권4호
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• pp.149-155
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• 2022

The aim of this study was to compare the mechanical properties of 0.6 and 0.8 mm cerclage wires with the 1.0 mm cerclage wire in the twist, single-loop, double-loop, double-wrap, and loop/twist knot methods. Six stainless steel cerclage wires of various diameters in different knot methods were tied round a customized jig mounted on a load testing machine. The initial tension, initial stiffness, and yield load were evaluated. The failure mode of each cerclage was observed. For each wire size, the double-loop, double-wrap, and loop/twist knots showed significantly greater initial stiffness, and yield load than those seen with twist and single-loop knots. The single-loop knot showed the least initial stiffness regardless of the diameter. As the cerclage wire diameter increased, the cerclage tended to show significantly greater initial stiffness, and yield load. Failure modes varied depending on the knot configurations. Single-loop knots of smaller-diameter wires less than 1 mm had similar or lower initial tension, initial stiffness, and yield load than a twist knot. Owing to the variance in mechanical properties, the clinical application of the knot type should depend on the diameter of the cerclage wire.

• 한국생활과학회지
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• 제10권2호
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• pp.189-203
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• 2001

The pulpous of this study is to investigated the kind and feature of the knots used in four categories, "living, clothing, ceremony, and decoration", after analysing and examining 42 knot remains of the folklore museum of On yang. The method were by old books and various kind's related books, history of knots and kind of knots investigated and analyze relics were actual proof investigation of real things and supplementary materials were photos, drawings, and museum's explanation used. The results are as is following ; First, a knot is twisted by two threads, formed in the process of twisting, become in equal shape, and made in symmetry. Second, In knot's names, there are sangkang, karakge, ankyongchip, jamjary, kukhwa, bol, byongary, memi, kkondiki, kong, yonbong which are easily seen in nature. Third, a knot was used in as living things in the era of the three Kingdoms, as a decoration such as Buddhism goods in Koryo. In the era of Cho sun, Because of the development of knot's kind and the variety of service, it was the target of restriction as a luxury. Fourth, as a result of investigating museum's relics, a knot was smaller than the chief object because that is a decoration. Fifth, there are 8 kinds for living and clothing which are simple knots "doramaetup, karakgemaetup, and sangtchokmaetup". Sixth, the complex knots such as kukhwamaetup, byongarymaetup, and 3bolkamkae emaetup are used on pangchang, chokja, nambawi, and chobawi. Seventh, there are 10 kinds for ceremony, the simple knots are twisted and the complex knots such as kukhwamaetp, maehwamaetup, nabimaetup, and sasaekgupoki are used. Eighth, there are 14 kinds for decoration, the simple knots such as doraemaetup, kakagemaetup, santchokmaetup, and ankyongchipmaetup and the applied knots such as kukhwamaetup, byongarymaemaetup, changkumaetup, nabimaetup, and seokssima etup are used. There are 42 knot remains in the folklore museum of On yang. Of them, there are 33 kinds in the present, 17 used. that is because only several knots have been used. Finally, to forget the knot's way, we will set up a plan to keep with it.

• Journal of the Korean Wood Science and Technology
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• 제38권3호
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• pp.170-177
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• 2010

구조용 목재부재의 성능 예측에 가장 큰 영향을 끼치는 옹이를 활용하여 유한요소 수치해석을 실시하였다. 다른 구조용 재료와 달리 목재의 경우 직교이방성을 나타내기 때문에 이를 적용하였고 옹이를 실린더 형태, 원추형 형태, 육면체 형태로 모델화 하였다. 목재 부재에 대해 실제 압축강도실험을 실시하여 그 파괴형태를 파악하고 최대강도값을 계산하였으며, 각 부재의 치수와 옹이의 크기, 위치, 개수를 반영한 수치해석 모델을 제작하여 유한요소해석을 실시하였다. 실험에서 얻어진 최대압축강도를 적용한 수치해석을 실시하여 옹이자료에 따른 각 부재의 응력분포형태를 파악하고 이를 실제 부재의 파괴형태와 비교 분석하였다. 수치해석에 소요되는 시간이나 요수 분할의 어려움, 옹이 주위의 응력 전달의 유사성 등에 기준했을 때 실린더 형태의 요소가 가장 타당하다고 판단되었다. 또한 응력 분포 모양과 변형 분포 모양을 비교한 경우 유한 요소 수치해석의 결과에서 응력이 가장 집중되는 부분과 변형이 가장 심하게 발생한 주위에서 실제 시편의 파괴나 균열이 발생함을 알 수 있었다. 이를 기초로 유한요소 수치해석법을 직교이방성과 옹이 모델링을 적절히 적용할 경우 휨응력을 받는 부재와 인장 응력을 받는 부재 등의 성능 해석에 유용한 수단으로 활용될 수 있을 것으로 판단된다.

• 한국응용곤충학회지
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• 제40권2호
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• pp.143-147
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• 2001

국내 고추 19품종을 이용하여 성주 참외 재배지역에 가장 많이 분포하고 있는 두 종의 뿌리혹선충, Meloidogyne arenaria와 M. incognita에 대한 저항성을 검정하였다. M. arenaria 에는 검사대상 고추 품종 모두가 저항성이었으며, M. incognita에는 품종별로 차이가 있었다. 즉 농우꽈리풋고추와 청옥고추는 감수성이었고, 알찬고추, 대왕고추, 진미고추, 조풍고추, 태양건고추, 한샘꽈리풋고추 등은 중간 저항성이었으며, 공공칠고추, 그린 No. 500 피만고추, 다홍건고추, 마니따고추, 신바람고추, 퍼팩토고추, 한마음고추 등은 강한 저항성으로 나타났다. 이상의 결과로 미루어 참외재배지의 뿌리혹선충 피해가 심한 포장에는 6월경 참외를 수확한 후, 공공칠고추, 그린 No. 500 피만고추, 다홍건고추, 마니따고추, 신바람고추, 퍼팩토고추, 한마음고추 등을 재배함으로서 뿌리혹선충의 밀도를 감소시킴과 동시에 고추 생산으로 부가소득도 가져을 수 있을 것이다.

• 대한기계학회논문집
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• 제18권10호
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• pp.2797-2804
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• 1994

This paper analyzes the behaviors of corrugated membrane under the cryogenic liquid pressure and thermal loading using the FEM analysis program MARC. The FEM calculations were carried out on the basis of measured data of Technigaz membrane. It is very important to know the concentration levels and distributions of stress in the corrugated membrane. A quarter of the membrane sheet in place of the whole membrane was simulated because of its geometric symmetricity. The calculated results of the concentrated stress showed that the maximum stress occurs at the knot parts and at the root corner radius of the corrugations. The FEM calculated results indicated that the ring knot membrane which was developed in this study showed uniformly distributed stress and the lowest stress levels in the cross knot area in comparison with other two membranes. These results are very important to optimize the shape and improve the safety of membrane structure.

• 한국식물병리학회지
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• 제14권6호
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• pp.603-605
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• 1998

Soil and root samples were collected form the rhizoshpere of 11 different medicinal plants to determine the incidence, density and identification of root-knot nematode species associated with medicinal herbs. About 55% of medicinal herbs examined was found to be infested with root-knot nematodes. As a result of infection casued by three root-knot nematodes, M. hapla recorded 43.3% in medicinal herba whereas M. incognita and M. arenaria showed 7.9% and 3.7%, repectively. Forsythia koreana, Hemerocalis fulva, Hibuscus mutabilis and Petasites japonicus were the most severely infested herbs whereas Acanthopanax sessilflorus was least infested. Population of the second stage younger plants. Meloidogyne hapla, M. incognita and M. arenaria were the species associated with the medicinal herbs. The most abundant nematode observed in medicinal herbs was M. hapla and followed by M. incognita and M. arenaria. M. arenaria was observed firstly on Ficus carica, one of medicinal plant.

• 수산해양기술연구
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• 제57권4호
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• pp.283-291
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• 2021

The Korean stow net is a fishing method that utilizes the changing direction of the net entrance with the tidal current. This study attempted to obtain basic data from the recent offshore stow net fisheries to improve the gear by analyzing the dynamic behavior of the nets affected by current speed and direction using computer simulations. A numerical calculation was performed at a current speed of 0.5 knot between 2.5 knot at each 0.5 knot. The time taken for the gear opening was the longest from 0.5 knot at 1,500 seconds and the shortest from 2.5 knot at 450 seconds in the simulations. In all cases, the net width and tension at net deployment gradually decreased as the current speed decreased. However, the net height tended to increase inversely proportional to the current speed. During the net rotation, the net height was maintained at all cases. The net width and tension fluctuated, but the regularity was very low. In this study, the calculated simulation data showed that the opening efficiency decreased proportional to the current speed. The opening efficiency is related to the catching efficiency; therefore, it is necessary to improve the gear to enhance its opening efficiency.