• Title/Summary/Keyword: silo

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Studies on the Penetration, Diffusion Ability and Effect of Insects Control Using the Methyl Bromide in the Vertical Silo (수직사이로에 있어 MB훈증제의 침투확산성 및 살충효과 시험)

  • Hah J.K.;Kim J.T.;CHO N.K.;Kim B.H.
    • Korean journal of applied entomology
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    • v.20 no.4 s.49
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    • pp.212-216
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    • 1981

  • This experiment was carried out to investigate the penetration velocity and diffusion ability of methyl bromide fumigants under the condition of natural gravity, and the effect of in control of yellow corn in the vortical silo. The results were as fallows 1. The methyl bromide remainded concentration on the surface of the vertical silo was rapidly reduced from over 100mg/l to under 20mg/l, within 2 hours after supplying methyl bromide fumigant 2. Even 3m depth place from the surface of the vertical silo filled with yellolw corn was well penetrated within 30 minutes, but its remained methyl bromide gas was reduced gradually from over 100mg/l to 30mg/l after 12 hours duration. 5. In case of 13m place tile penetration ability of methyl bromide was over 100mg/l within one hour and kept the same concentration of it for 12 hours, its remainded methyl bromide preserved over 40mg/l until 48 duration time. 4. Less methyl bromide gas was detected at the bottom place than 3m and 13m depth of the vertical silo. It showed bellow 20mg/l of methyl bromide gas only through the whole duration time. 5. Comparing to the vertical penetration velocity of mehtyl bromide gas, the horizontal diffusion ability was not so good. Therefore, remained methyl bromide gas of 3m depth at the wall side of silo was about half than that of center circle where the nearer place from the methyl bromide supplying point, and the methyl bromide gas of 13m depth placed center circle was detected about 15 to 20 times than that of wall side. 6. For the purpose of examining the mortality of methyl bromide, the testing insects (Lesser Rice weevil and confused flour beetle) placed on the surface and bottom side of the silo were killed completely after 24 hrs fumigation, and the same results showed also at the 3m, 7m and 13m depth after 48 hrs fumigation.

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회원작품

  • Korea Institute of Registered Architects
    • Korean Architects
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    • no.7 s.89
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    • pp.35-48
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    • 1976

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Application of Advanced Blast Demolition Simulation Method to the Drill and Blast Design for Demolishing Cylindrical Structures (원통형 구조물의 발파해체설계에 대한 최신 발파해체 시뮬레이션 기법의 적용)

  • Park, Hoon;Suk, Chul-Gi;Kim, Seung-Kon
    • Explosives and Blasting
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    • v.26 no.1
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    • pp.7-14
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    • 2008

  • In order to complete successfully the demolition of a silo structure by means of felling method, structural properties and the geometric design of blast mouth have to be considered. In this study, a commercial software, 3-dimensional applied element analysis (3D AEM), was used to investigate the effect of the geometrical parameters of blast mouth on the collapse behavior of the silo structure.

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Patterns between wall pressures and stresses with grain moisture on cylindrical silo

  • Kibar, Hakan
    • Structural Engineering and Mechanics
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    • v.62 no.4
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    • pp.487-496
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    • 2017

  • The focus of this study were to investigate patterns between wall pressures and stresses with grain moisture of soybean and rice varieties widespread cultivated in Turkey in order to determine needed designing parameters for structure analysis in silos at filling and discharge. In this study, the wall pressures and stresses were evaluated as a function of moisture contents in the range of 8-14% and 10-14% d.b. The pressures and von Mises stresses affected as significant by the change of grain moisture content. The main cause of pressure and stress drops is changed in bulk density. Therefore is extremely important bulk density and moisture content of the product at the structural design of the silos. 4 mm wall thickness, were determined to be safe for von Mises stresses in both soybean and rice silos is smaller than 188000 kPa.

  • https://doi.org/10.12989/sem.2017.62.4.487 인용 KSCI

DRM-FL: A Decentralized and Randomized Mechanism for Privacy Protection in Cross-Silo Federated Learning Approach (DRM-FL: Cross-Silo Federated Learning 접근법의 프라이버시 보호를 위한 분산형 랜덤화 메커니즘)

  • Firdaus, Muhammad;Latt, Cho Nwe Zin;Aguilar, Mariz;Rhee, Kyung-Hyune
    • Annual Conference of KIPS
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    • 2022.05a
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    • pp.264-267
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    • 2022

  • Recently, federated learning (FL) has increased prominence as a viable approach for enhancing user privacy and data security by allowing collaborative multi-party model learning without exchanging sensitive data. Despite this, most present FL systems still depend on a centralized aggregator to generate a global model by gathering all submitted models from users, which could expose user privacy and the risk of various threats from malicious users. To solve these issues, we suggested a safe FL framework that employs differential privacy to counter membership inference attacks during the collaborative FL model training process and empowers blockchain to replace the centralized aggregator server.

  • https://doi.org/10.3745/PKIPS.y2022m05a.264 인용 PDF