• Title/Summary/Keyword: 포장저항성

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Studies on Resistance of Sweet potato Varieties to Black Rot(Ceratocystis fimbriata E.) (고구마 품종의 흑반병 저항성에 관한 연구)

  • Park, K.Y.;Seong, R.C.;Ham, Y.S.;Chung, B.J.
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.23 no.2
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    • pp.118-125
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    • 1978
  • To find out highly resistant gene source to black rot fungus in sweetpotato varieties, a screening test was carried out with inoculated tubers and sprouts in 1976 and 1977. Fifteen varieties out of 165 and 54 varieties out of 161 were highly resistant to black rot in the tuber and sprout tests. respectively. The sprout test showed bigger variation from year to year compared to tuber test. Varieties highly resistant to black rot in both tuber and sprout tests were Suweon # 59, #81, #90, Norin #17, #23. Chilship-il cho, Sachun Jong #36, Hamkao, and Kandee.

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Insecticide Resistance Mechanism in the Spiraea Aphid, Aphis citricola (van der Goot) (조팝나무진딧물의 살충제 저항성 메카니즘에 관한 연구)

  • ;;本山直樹
    • Korean journal of applied entomology
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    • v.34 no.2
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    • pp.89-94
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    • 1995
  • Resistance mechanism of organophosphorus insecticides (OPs) in the spiraea aphid, whose populations were originated from several apple orchards where various OPs were frequently sprayed, was investigated. For Wonju population to which insecticides were not sprayed, resistance ratios (BRs) for pirimicarb, phosphamidon, and demeton S-methyl re 49, 31, and 5, respectively. However, for Yesan population to which OPs were sprayed 5 times, RRs for pirimicarb, phosphamidn, and dementon were 830, 536, and 204, respectively. The esterase activities of Wonju and Yesean populations increased by 44.5 and 92.0% compare to that of Kwagju population. R/S a values (S clone Kwangju population; R clone: Iechon opulation) for acetylcholinesterase (AChE) inhibition (${I}_{50}$) by pirimicarb and phosphamidon were 299.2 and 186.0, respectively. Our results indicate that increase of esterase activity and reduction of AChE sensitivity seemed to contribute insecticide resistance of the spiraea aphid.

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On Selection of Resistant Potato Cultivars to Common Scab(S. scabies) (감자 더뎅이병 저항성 품종 선발)

  • Hong, Soon-Yeong;Kang, Yong-Kil;Hahm, Young-Il
    • Research in Plant Disease
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    • v.10 no.2
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    • pp.135-137
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    • 2004
  • It was conducted to select the resistant potato cultivars to common scab, to replace the existing susceptible cv Dejima in Jeju island conditions both 1997 and 2001. Among cultivars, cvs Jemchip, Alpa, Atlantic and Jopung were more resistant than others in the field with both low and high incidence of the disease. Also among the existing cultivars grown in Korea, cvs Superior, Jopung and Chubaek were resistant, expecially in terms of production of marketable potatoes.

Early-Age Behavior Monitoring of Bus-Stop-Section Pavement Constructed Employing Precast Concrete Pavement Method (조립식포장 공법을 적용한 버스정거장 포장 초기 거동 추적조사)

  • Oh, Han-Jin;Kim, Seong-Min;Hwang, Ju-Hwan;Park, Won-Joo
    • International Journal of Highway Engineering
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    • v.13 no.1
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    • pp.229-237
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    • 2011
  • This study was conducted to investigate the early-age performance of precast pavements constructed by replacing existing asphalt pavements for a bus stop section in urban bus only lanes. The behavior monitoring items included the differences in the levels between asphalt and precast pavements at the entrance and exit of the precast pavement, joint widths and level differences between precast slabs, slab settlement, and skid resistance at the slab surface. The applicability of diamond grinding techniques was also investigated. The results of this study showed that the slab level, joint width, settlement, and skid resistance were not much changed as time passed, which implied that the precast pavements stably sustained vehicle loads. It was also found that employing diamond grinding could much improve the leveling between precast slabs and the surface skid resistance.

Noise reduction of Asphalt Concrete Pavement : Techniques and their performance evaluation (아스팔트 저소음 포장의 개발 및 공용성 평가)

  • Ock, Chang-Kwon;Kim, Jin-Hwan;Lee, Jong-Sup
    • International Journal of Highway Engineering
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    • v.12 no.1
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    • pp.29-37
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    • 2010
  • Porous pavements can provide road users with beneficial characteristics such as skid resistance and surface water drainage under rainy condition, and they cause less tire-road noise than conventional hot mix asphalt(HMA) pavements. However, voids of porous pavements are easily clogged by road debris at early stages, which leads to frequent maintenance works. Therefore, this study focused on the way of minimizing void clogging in porous pavements. During mixture design, the quantity of coarse aggregate has been increased to form many straight void conduits (SVCs) in porous HMAs. These SVCs were found to be effective resisting the void clogging problems. Four different porous HMAs(19mm, 13mm, 10mm, and 8mm) were developed and placed on highway roads. Their performances were validated with field tests during the past four years.

Resistance of Diamondback Moth(Plutella xylostella L.) against the Pyrethroids (피레스로이드제에 대한 배추좀나방의 포장약제저항성의 변동)

  • 송승석
    • Korean journal of applied entomology
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    • v.31 no.4
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    • pp.338-344
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    • 1992
  • This test has been carried out to clear the effectiveness of pyrethroid insecticides to the Diamond back moth, that was complained by a farmer. The results obtained are summarized as follows. Effectiveness of Pyrethroids to suceptable strain and the results of chemical anaysis on the ingredients of pyrethroikds were normal at recommended concentrations. The effect ualue of pyrethroid by which the blocks were only one time treated was 57-59%, whereas the blocks sprayed 4 consecutive times of pyrethroid didn't show any effectiveness as shown in larval increasing rate of 489-552%. Among the results of field test conducted from 1990 to 1991 at 7 area, Dae Gu area showed the highest Effectiveness as 95-98%. However, Pyong Taek area, showed the least effectiveness as 0% in effect value. The resistant population which was collected at Tae kwan Ryung area was resurrected susceptability as much as JMC, in case of Placing it in non-treatment environment, whereas the pupulation which was revealed to pyrethroids for 6 genetations showed as much as 341-544 times of resistance compared with JMC. The non-effectiveness of pyrethroids to Diamondback moth which was complainted by a certain farmer named Mr Ju, was clearly resulted by the development of insect resistance. In Korea, the resistance of Diamondback moth to pyrethroids has developed in some area, as well as the resistance of pyrethroids has developed according to the continuous use of Insecticides, and the susceptability resurrected by stopping the use of pyrethroids. The result from this test would suggest that the pyrethroid insecticides should be applied in turb with other insecticides.

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Development and applicability study of customized porcelain packaging technology using 3D printed TPU material (TPU 소재 3D 출력물을 이용한 도자기 맞춤형 포장 기술 개발 및 적용성 연구)

  • Oh Seungjun
    • Conservation Science in Museum
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    • v.31
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    • pp.39-54
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    • 2024
  • We wanted to check The feasibility of substituting the manual ceramic packaging technology with 3D digital technology using cotton pad packaging material was examined. To examine the shock absorption, vibration resistance and compression resistance of 3D packaging material printed out by using TPU material, composite vibration, and packaging compression and drop tests were conducted. As the results of the tests, the 3D packaging material displayed vibration resistance that has been improved by approximately 10~20% based on the damping ratio of the composite vibration test, compression resistance performances that are more than 5 times higher, and shock absorption performance was also improved as the packaged object was not broken in the six-sided drop test. Based on these results, it is determined that it would be possible to secure the reusability of the ceramic packaging materials and simplify packaging techniques, and to present diversity in the packaging materials and packaging technologies.

Occurrence of Botrytis cinerea Resistant to Dicarboximide Fungicides on Strawberries in Greenhouses (시설재배(施設栽培) 딸기 포장(圃場)에서 Dicarboximide 계(系) 약제저항성(藥劑抵抗性) 잿빛곰팡이병균(病菌)의 발생(發生))

  • Yu, Seung Hun;Park, Jeong Hun
    • Korean Journal of Agricultural Science
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    • v.19 no.2
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    • pp.170-178
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    • 1992
  • Isolates of Botrytis cinerea resistant to dicarboximide fungicides were collected from strawberry fields in greenhouses in spring and early summer of 1990. Five out of 9 isolates of B. cinera were resistant, which showed mycerial growth on PDA containing dicarboximide fungicides(procymidone and vinclozolin) with concentrations of 100, 400 and $1,600{\mu}g/ml$. The minimal inhibitory concentration(MIC) values of the dicaboximide-resistant isolates was more than $6,400{\mu}g/ml$, while that of the sensitive isolates was less than $6.25{\mu}g/ml$. The germination ratio of conidia of the resistant isolates on PDA containing procymidone and vincolozolin was more than 95%, while that of the sensitive was less than 15%. The procymidone-resistant isolates were also resistant to vinclozolin, showing cross-resistant between the fungicides, but cross-resistant was not observed between the dicarboximides and dichlofluanid. Resistance to benomyl was also found in all the dicarboximide resistant isolates. Occurrence frequency of dicarboximide-resistant isolates out of 223 isolates was about 40%. The resistant isolates were widely distributed throughout Korea.

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Initial Performance Evaluation of Fine-size Exposed Aggregate PCC Pavement by Experimental Construction (시험시공을 통한 소입경 골재노출 콘크리트포장의 초기 공용성 평가)

  • Kim, Young-Kyu;Choi, Don-Hwa;Lee, Seung-Woo;Kim, Hyung-Bae
    • International Journal of Highway Engineering
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    • v.12 no.1
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    • pp.87-98
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    • 2010
  • Surface of fine-size exposed aggregate Portland cement concrete pavements is consists of exposed coarse aggregate by removing upper 2~3mm mortar of concrete slab. Fine-size exposed aggregate PCC pavements have advantages of maintaining low-noise and adequate skid-resistance level during the performance period. In order to provide the successful exposed concrete aggregate pavement, uniform distribution of the coarse aggregate on pavement surface through adequate the mix design and exposing method. In this study, evaluated initial performance of fine-size exposed aggregate PCC pavement by experimental construction. And it was known that fine-size exposed aggregate concrete pavement which can reduce the noise and maintain the adequate level of skid resistance and strength.

Factors Affecting the Expression of Durable Resistance of Rice Cultivars to Blast Caused by Pyricularia grisea Sacc. 1. Selection of Durably Resistant Cultivars for Rice Blast (벼도열병에 대한 품종의 지속저항성 발현요인에 관한 연구 1. 벼도열병에 대한 지속저항성 품종 개발)

  • 라동수;오정행;류재당
    • Korean Journal Plant Pathology
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    • v.12 no.2
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    • pp.231-236
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    • 1996
  • 한국에서 재배되고 있는 벼 품종의 도열별에 대한 지속저항성 품종을 조기에 선발, 보급할 수 있는 방법을 보색하기 위하여 1985년부터 1994년까지 온실 유묘검정, 밭못자리 및 포장검정을 통하여 저항성 정도를 평가하고 재배면적과 재배기간을 참고로 하여 지속저항성 품종을 선발하였다. 도열병에 대한 저항성 품종으로는 다양한 레이스에 침해되면서 개체당 병반수 20개 이내, 밭못자리검정에서는 평균 발병정도 5이하, 본답에서의 잎도열병은 병반면적율 0.5%이하, 이삭도열병 발생은 이병수율 5% 이내로 병발생이 비교적 적은 섬진벼, 팔공벼 및 동진벼를 선발하였고, 지속저항성 품종으로는 재배기간이 10년 이상 유지되면서 재배면적은 전체재배 면적의 20% 이상을 차지하고 있는 품종 중 장기간 동안 저항성을 발현하는 동진벼를 선발하였다.

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