• Title/Summary/Keyword: commercial code

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Systems Engineering Approach to the Heat Transfer Analysis of PLUS 7 Fuel Rod Using ANSYS FEM Code

  • Park, Sang-Jun;Mutembei, Mutegi Peter;Namgung, Ihn
    • Journal of the Korean Society of Systems Engineering
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    • v.13 no.1
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    • pp.33-39
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    • 2017
  • This paper describes the system engineering approach for the heat transfer analysis of plus7 fuel rod for APR1400 using, a commercial software, ANSYS. The fuel rod is composed of fuel pellets, fill gas, end caps, plenum spring and cladding. The heat is transferred from the pellet outward by conduction through the pellet, fill gas and cladding and further by convection from the cladding surface to the coolant in the flow channel. The goal of this paper is to demonstrate the temperature and heat flux change from the fuel centerline to the cladding surface when having maximum fuel centerline temperature at 100% power. This phenomenon is modelled using the ANSYS FEM code and analyzed for steady state temperature distribution across the fuel pellet and clad and the results were compared to the standard values given in APR1400 SSAR. Specifically the applicability of commercial software in the evaluation of nuclear fuel temperature distribution has been accounted. It is note that special codes have been used for fuel rod mechanical analysis which calculates interrelated effects of temperature, pressure, cladding elastic and plastic behavior, fission gas release, and fuel densification and swelling under the time-varying irradiation conditions. To satisfactorily meet this objective we apply system engineering methodologies to formulate the process and allow for verification and validation of the results acquired. The close proximity of the results obtained validated the accuracy of the FEM analysis of the 2D axisymmetric model and 3D model. This result demonstrated the validity of commercial software instead of proprietary in-house code that is more costly to develop and maintain.

The Allocation of Risk under Sale of Goods in American Law - Focused on the Uniform Commercial Code and Cases - (미국법상 물품매매계약에서의 위험의 분배 - 통일상법전(UCC)의 규정 및 사례를 중심으로 -)

  • Kim, Young Ju
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
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    • v.58
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    • pp.59-98
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    • 2013
  • Risk of loss is a term used in the law of contracts to determine which party should bear the burden of risk for damage occurring to goods after the sale has been completed, but before delivery has occurred. Under the Uniform Commercial Code (UCC), there are four risk of loss rules, in order of application. First, it is agreement that is the agreement of the parties controls. Second, the breaching party is liable for any uninsured loss even though breach is unrelated to the problem. Hence, if the breach is the time of delivery, and the goods show up broken, then the breaching rule applies risk of loss on the seller. Third, the delivery by common carrier other than by seller is necessary: Risk of loss shifts from seller to buyer at the time that seller completes its delivery obligations; If it is a destination contract, then risk of loss is on the seller; If it is a delivery contract, then the risk of loss is on the buyer. Fourth, if the seller is a merchant, then the risk of loss shifts to the buyer upon buyer's receipt of the goods. If the buyer never takes possession, then the seller still has the risk of loss. This paper discusses problems of risk of loss under the American law. Specifically, this paper focuses on the interpretation of UCC sections and analysis of various cases. By comparing, also, UCC and Korean law, the paper proposes some implications of risk of loss issues for Korean law.

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A Study on the Necessity of Korean Standard and Code of Safety for Diving System (잠수 시스템의 국내 표준 및 안전 기준 제정 필요성에 관한 연구)

  • Park, Jong-Yeob;Kang, Sin-Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.35 no.6
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    • pp.856-860
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    • 2011
  • The standard and code of safety for diving systems include requirements in the area of diving plant, personnel qualification, diving medicine and operation. In this study the necessity of Korean standard and code of safety for diving system is suggested through the review and comparison of the diving system regulations of domestic as well as foreign governments and other private organizations. Furthermore, by reviewing the status of oversea's diving organizations the proposition was made which can lead the commercial diving sector to international cooperation.

Analysis of Propellant Feeding Sub-Systems for Liquid Rocket (SINDA/FLUINT를 활용한 발사체 추진기관 공급계 해석)

  • Cho, Nam-Kyung;Jeong, Yong-Gahp;Han, Sang-Yeop;Kim, Young-Mog
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.241-244
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    • 2006
  • The analysis of propellant feeding sub-system is performed using a commercial code SINDA/FLUINT, the comprehensive finite-difference, one-dimensional, lumped parameter tool. With the code, cryogenic helium supply system, liquid oxygen supply system, helium injection cooling system are evaluated. The code gave satisfactory estimation scheme for propulsion system characterized by cryogenic temperature and high pressure, two phase flow. This paper focuses on presenting calculation scheme of propulsion sub-system using one-dimensional code like SINDA/FLUINT.

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Technical Issues on Implementation of GPS Signal Authentication System

  • So, Hyoungmin;Jang, Jaegyu;Lee, Kihoon;Park, Junpyo
    • Journal of Positioning, Navigation, and Timing
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    • v.7 no.3
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    • pp.139-146
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    • 2018
  • In recent years, a satellite navigation signal authentication technique has been introduced to determine the spoofing of commercial C/A code using the cross-correlation mode of GPS P(Y) code received at two receivers. This paper discusses the technical considerations in the implementation and application of authentication system simulator hardware to achieve the above technique. The configuration of the simulator consists of authentication system and user receiver. The synchronization of GPS signals received at two devices, data transmission and reception, and codeless correlation of P(Y) code were implemented. The simulation test result verified that spoofing detection using P(Y) codeless correlation could be achieved.

Development on the Structural Analysis Code of the Air-Operated Valve (공기구동 밸브의 구조해석 코드개발)

  • Lee Hyun-Seung;Lee Young-Shin;Cho Taik-Dong;Ko Sung-Ho;Shin Sung-Ky;Lee Ho-Young
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2006.04a
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    • pp.575-580
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    • 2006
  • Air-operated valves are extensively used for process control and system isolation functions in nuclear power plant, where the safety is primary issue. The purpose of this study is to develop structural analysis code of various air-operated valves such as globe valve, gate valve, and butterfly valve. The thrust formula is derived for valve with the expected weak areas. The expected weak areas are referred from EPRI data. The structural stress analysis is carried out by analytical and commercial FEM code, ANSYS 8.0. The numerical results are compared together and verified on program procedures.

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Design of 5kW-class Horizontal Axis Wind Turbine using In-house Code POSEIDON (In-house 코드 POSEIDON을 이용한 5kW급 수평축 풍력발전용 로터 블레이드 형상설계)

  • Kim, Ki-Pyoung;Kim, Ill-Soo;Choi, Young-Do;Lee, Young-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.492-492
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    • 2009
  • Nowadays in Republic of Korea, there is no distinct reference for the related design technology of rotor blade of wind turbine. Therefore the optimum design and evaluation of performance is carried out with foreign commercial code softwares. This paper shows in-house code software that evaluates the aerodynamic design of wind turbine rotor blade using blade element-momentum theory (BEMT) and processes that is applied through various aerodynamics theories such as momentum theory, blade element theory, prandtl's tip loss theory and strip theory. This paper presents the results of the numerical analysis such as distribution of aerodynamic properties and performance curves using in-house code POSEIDON.

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Numerical Simulation of friction Stir Spot Welding Process with AA5083-H18 (AA5083-H18 판재의 마찰 교반 점 용접 공정에 대한 전산 해석)

  • Kim, Don-Gun;Badarinarayan, Harsha;Ryu, Ill;Kim, Ji-Hoon;Kim, Chong-Min;Okamoto, Kazutaka;Wagoner, R.H.;Chung, Kwan-Soo
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.05a
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    • pp.458-461
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    • 2009
  • Thermo-mechanical simulation of the Friction Stir Spot Welding (FSSW) processes was performed for the AA5083-H18 sheets, utilizing commercial Finite Element Method (FEM) and Finite Volume Method (FVM) which are based on Lagrangian and Eulerian formulations, respectively. The Lagrangian explicit dynamic FEM code, PAM-CRASH, and the Eulerian Computational Fluid Dynamics (CFD) FVM code, STAR-CD, were utilized to understand the effect of pin geometry on weld strength and material flow under the unsteady state condition. Using FVM code, material flow pattern near the tool boundary was analyzed to explain the weld strength difference between the weld by cylindrical pin and the weld by triangular pin, while the frictional energy concept using the FEM code had limitation to explain the weld strength difference.

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A Study on Sunshine Environment with Different Distance between Buildings (인동간격에 따른 일조환경에 대한 연구)

  • 최용석;최지혜;김용식
    • Journal of the Korean housing association
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    • v.15 no.2
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    • pp.55-62
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    • 2004
  • Apartment design in residential Area is restricted by building distance limit code. Building distance limit decreases gradually to the 0.8H(height), and residential area has 250% site area ratio by building code, so site using has become efficient. In this study, examine the relationship between present building distance limit and right of daylighting environment by computer simulation. As well, high-rise residential officetel and multipurpose residential building becomes increase in commercial non-residential area. In the domestic, residential type multipurpose building made at the business area or central business area has 400∼800% site area ratio by building code. However, at a dweller's point of view, there are much lacks of environmental consideration to provide suitable daylighting environment. And, POE: Post Occupancy Evaluation is not completed yet. In this study, however, progress architectural environment prediction, basis by right of daylighting, and examine the possibility of daylighting by architectural distance limit code in residental area and by high-rise, high-density residential building in non-residental downtown area.

Research for development of our own image processing code for neutron tomography (중성자 토모그래피를 위한 영상처리 자체코드 개발 연구)

  • Kim, Jin Man;Kim, TaeJoo;Yu, Dong In
    • Journal of the Korean Society of Visualization
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    • v.18 no.1
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    • pp.44-49
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    • 2020
  • Neutron radiography has been widely used in many research areas due to its different characteristics from X-rays. Neutron tomography is a powerful tool because it can clearly show the inside of an object that the eye cannot see. However, generally, commercial software is used for the reconstruction of neutron tomography. It means that maintenance costs are incurred and analysis is inefficient in some cases. In this respect, our own image processing code is required to reconstruct neutron images efficiently. In this study, an image processing code is developed for reconstruction of cross-sectional images from neutron radiography taken from the side of the object. Using the developed code, cross-sectional images of the sample are successfully reconstructed.