• Title/Summary/Keyword: BUB2

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Seismic Performance of Stainless Power Joints Piping System using Finite Element Analysis (압착식 조인트가 적용된 파이프라인 유한요소 해석)

  • Ju, Bu-Seog;Jeon, Bub-Gyu;Nam, Jun-Seok;Ryu, Yong-Hee;Son, Ho-Young
    • Proceedings of the Korean Society of Disaster Information Conference
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    • 2017.11a
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    • pp.145-146
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    • 2017
  • 최근 세계적으로 많은 지진이 발생하고 있으며 기상이변으로 인한 자연재해로 인해 주요 시설물들의 안전성에 관한 관심이 증가하고 있는 추세이다. 특히 비구조 요소의 경우 구조 요소보다 건설 초기 투자비용이 높아 지진이 발생하였을 때 많은 피해가 발생할 가능성이 있으며 비구조 요소의 파괴는 심각한 2차피해로 발전 될 수 있으므로 내진안전성 평가는 반드시 이루어져야 한다고 볼 수 있다. 따라서 본 연구에서는 압착식 조인트의 접촉을 고려한 수계소화설비 파이프라인의 내진성능 평가를 위한 비선형 유한요소 모델을 구축하였다.

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Additional Data Transmission Method using DTV Essential Padding Area (DTV 필수 패딩 영역을 이용한 부가 데이터 전송방법)

  • Lee, Bub ki;Han, Chan Ho
    • Journal of Korea Multimedia Society
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    • v.21 no.11
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    • pp.1237-1243
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    • 2018
  • In the HDTV video codec, conventional the padding method of DEPA(DTV essential padding area) region is aimed at minimizing the redundant information to be transmitted. This article propose a method to transmit additional data by using DEPA region. The proposed method is effective for the channel and storage because it can reduce the amount of bits while preventing deterioration of image quality by inserting binary gray image blocks into the DEPA region. Additionally this algorithm can be used in various fields because it conforms to the standards of MPEG-2, ATSC, and DVB encoders.

A Study on The Variation of Penetration According to The Shielding Gas in A1100 Aluminum Welding (A1100 알루미늄 용접에서 실드가스의 종류에 따른 용입부의 변화 연구)

  • Kim, Jin-Su;Kim, Bub-Hun;Kim, Gue-Tae;Park, Yong-Hwan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.2
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    • pp.49-54
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    • 2013
  • Recently welding of aluminum material is actively carried out to make lightweight in the fields of LNG vessels, aircraft, chemical plants, etc. To obtain high strength, hardness and elongation, elements such as manganese, zinc, silicon, etc should be added in aluminum alloy, which has been improved on the mechanical properties like precipitation hardening, age hardening, loosening, corrosion resistance acid resistance. Ar gas is used as a shielding gas of MIG welding for aluminum, also $N_2$, $O_2$, $CO_2$, $H_2$ etc can be added depending on the composition of the alloy. In this study, Ar + $O_2$, Ar, and He were used for welding, hardness, penetration status and changes in composition of penetrated parts were compared and analyzed. This made it possible to know the status and changes of the process in the penetrated parts depending on used gas throughout this study.

Study on Construction of IoT environments oneM2M standards utilizing the KETI Mobius platform and LoRa (KETI의 Mobius플랫폼과 LoRa를 활용한 oneM2M규격의 IoT 환경 구축에 관한 연구)

  • Lee, So-Haeng;Song, Bub-Sung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.10a
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    • pp.285-289
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    • 2016
  • In recent domestic new growth model based on the IoT it has been proposed by the industry and national authorities. As applied to these Internet-based IoT convergence center of the field is expected to be realized, including the improvement and increase of efficiency of various economic values. In this paper, using KETI ( Korea Electronics Technology Institute ) developed distribution being oneM2M standards-based platform from Mobius and Gateway Platforms & Cube, and low power, capable of long-range RF communication LoRa communication module is proposed to build the site applicable environment.

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AN ASSESSMENT OF UNCERTAINTY ON A LOFT L2-5 LBLOCA PCT BASED ON THE ACE-RSM APPROACH: COMPLEMENTARY WORK FOR THE OECD BEMUSE PHASE-III PROGRAM

  • Ahn, Kwang-Il;Chung, Bub-Dong;Lee, John C.
    • Nuclear Engineering and Technology
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    • v.42 no.2
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    • pp.163-174
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    • 2010
  • As pointed out in the OECD BEMUSE Program, when a high computation time is taken to obtain the relevant output values of a complex physical model (or code), the number of statistical samples that must be evaluated through it is a critical factor for the sampling-based uncertainty analysis. Two alternative methods have been utilized to avoid the problem associated with the size of these statistical samples: one is based on Wilks' formula, which is based on simple random sampling, and the other is based on the conventional nonlinear regression approach. While both approaches provide a useful means for drawing conclusions on the resultant uncertainty with a limited number of code runs, there are also some unique corresponding limitations. For example, a conclusion based on the Wilks' formula can be highly affected by the sampled values themselves, while the conventional regression approach requires an a priori estimate on the functional forms of a regression model. The main objective of this paper is to assess the feasibility of the ACE-RSM approach as a complementary method to the Wilks' formula and the conventional regression-based uncertainty analysis. This feasibility was assessed through a practical application of the ACE-RSM approach to the LOFT L2-5 LBLOCA PCT uncertainty analysis, which was implemented as a part of the OECD BEMUSE Phase III program.

A Study on Effect of Heat Treatment on Electrochemical Characteristics of Silicon-coated Graphite (실리콘이 코팅된 흑연의 열처리 효과에 따른 전기화학적 특성에 대한 연구)

  • Lee Myungro;Byun Dongjin;Jeon Bub Ju;Lee Joong Kee
    • Korean Journal of Materials Research
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    • v.15 no.1
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    • pp.66-72
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    • 2005
  • Surface modification of the silicon-coated graphite was carried out at $200^{\circ}C\~800^{\circ}C$ under hydrogen atmosphere. The silicon-coated graphites were prepared by fluidized-bed spray coating method. The components of silicon films prepared on the graphite consist of SiO, $SiO_x\;(1. The components of silicon films at $200^{\circ}C$ of heat treatment brought on the higher fraction of SiO and $SiO_x$ than that of $SiO_2$. However, inactive $SiO_2$ fraction increases with increase of the heat treatment temperature. The high content of SiO and $SiO_x$ in the silicon film on graphite leads to the higher discharge capacity in our experimental range.

A Multi-Dimensional Thermal-Hydraulic System Analysis Code, MARS 1.3.1

  • Jeong, Jae-Jun;Ha, Kwi-Seok;Chung, Bub-Dong;Lee, Won-Jae
    • Nuclear Engineering and Technology
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    • v.31 no.3
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    • pp.344-363
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    • 1999
  • A multi-dimensional thermal-hydraulic system analysis code, MARS 1.3.1, has been developed in order to have the realistic analysis capability of two-phase thermal-hydraulic transients for pressurized water reactor (PWR) plants. As the backbones for the MARS code, the RELAP5/MOD3.2.1.2 and COBRA-TF codes were adopted in order to take advantages of the very general, versatile features of RELAP5 and the realistic three-dimensional hydrodynamic module of COBRA-TF. In the MARS code, all the functional modules of the two codes were unified into a single code first. Then, the source codes were converted into the standard Fortran 90, and then they were restructured using a modular data structure based on "derived type variables" and a new "dynamic memory allocation" scheme. In addition, the Windows features were implemented to improve user friendliness. This paper presents the developmental work of the MARS version 1.3.1 including the hydrodynamic model unification, the heat structure coupling, the code restructuring and modernization, and their verifications.their verifications.

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A Study on the Deformation Characteristics of Gas Pipeline under Internal Pressure and In-Plane Bending Load (내압과 굽힘하중을 받는 가스배관의 변형특성에 관한 연구)

  • Jang, Yun-Chan;Kim, Ik-Joong;Kim, Cheol-Man;Jeon, Bub-Gyu;Chang, Sung-Jin;Kim, Young-Pyo
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.15 no.2
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    • pp.50-57
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    • 2019
  • This paper investigates deformation characteristics of gas pipeline using the in-plane bending experiment and finite element analysis of a pipe bend. The effect of the bending angle and internal pressure on the deformation characteristics is analyzed. The pipe bend used in this study is API 5L X65 (out diameter: 20 inch) material with the thickness of 11.9 mm. The maximum load, displacement at maximum load, angle and local strain of 90° pipe bend are obtained from the in-plane bending experiment. Comparison between FE results and experimental data shows overall good agreements. In addition, the deformation characteristics of 22.5° and 45° pipe bend are calculated using the finite element analysis. As a result, the effect of the bend angle on the deformation characteristics is discussed.