• Wind and Structures
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• 제15권3호
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• pp.209-221
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• 2012

The flutter reliability analysis of long span bridges requires use of a software tool that predicts the uncertainty in a flutter response due to uncertainties in the model formulation and input parameters. Existing flutter analysis numerical codes are not capable of dealing with stochastic uncertainty in the analysis of long span bridges. The goal of the present work is to develop a software tool (FREASB) to enable designers to efficiently and accurately conduct flutter reliability analysis of long span bridges. The FREASB interfaces an open-source Matlab toolbox for structural reliability analysis (FERUM) with a typical deterministic flutter analysis code. The paper presents a brief introduction to the generalized first-order reliability method implemented in FREASB and key steps involved in coupling it with a typical deterministic flutter analysis code. A numerical example concerning flutter reliability analysis of a long span suspension bridge with a main span of 1385 m is presented to demonstrate the application and effectiveness of the methodology and the software.

• 한국생산제조학회지
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• 제7권4호
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• pp.79-88
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• 1998

This study deals with the development of CAM system which can machine and measure any shape of mold and die by machining center and coordinate measureing machine . The overall goal of the CAM system is to achieve the mold and die machining , from digitizing through to final cutting. The hardware of the system comprises PC and machining center. CMM. There are three steps in the mold and die machining. (1) measuring of physical model by the CMM, (2) geometric modeling by the CAD system, (3) generation of NC code by the tool path compensated for tool radius. It is developed a software package, with which can conduct a micro CAM system in the PC without economical burden.

• ETRI Journal
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• 제30권6호
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• pp.799-806
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• 2008

In this paper, a new design for an error correcting code (ECC) is proposed. The design is aimed to build an ECC circuitry with minimal power consumption. The genetic algorithm equipped with the symbiotic mechanism is used to design a power-efficient ECC which provides single-error correction and double-error detection (SEC-DED). We formulate the selection of the parity check matrix into a collection of individual and specialized optimization problems and propose a symbiotic evolution method to search for an ECC with minimal power consumption. Finally, we conduct simulations to demonstrate the effectiveness of the proposed method.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1998년도 춘계학술대회 논문집
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• pp.76-81
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• 1998

The purpose of this study is the generation of B-spline surface by the 3D measurement data. The hardware of the system comprises PC and digitizing machine, machining center. There are three steps, (1) physical model measuring on the 3D laser digitizing machine, (2) B-spline surface modeling and Fairing, (3) CNC machining by the NC code. It is developed a software package, with which can conduct a micro CAM system in the PC without economical burden.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 춘계학술대회 논문집
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• pp.213-216
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• 2008

Sled test id widely used to evaluate the performance of occupant's safety system in frontal crash environment without having to conduct a full-scale crash test. Steel bar breaking system is used to generate deceleration profile which is experienced by passengers in frontal crash. In this study, deformation analyses of steel bars were conducted using a commercial FE code. Several guidelines were proposed to improve the accuracy of simulation.

• 정보과학회 논문지
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• 제45권2호
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• pp.150-156
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• 2018

소프트웨어 가시화 연구는 개발자들이 소프트웨어 시스템을 이해하고 코드 변경을 수행할 때 도움을 줄 수 있다는 점에서 중요하다. 최근 제시된 상향식 소프트웨어 가시화 도구들은 개발자가 직접 작업하는 코드 정보만을 보여주는 이점으로 개발자들의 작업에 도움을 줄 수 있다는 효과를 입증하고 있다. 하지만 이러한 도구들은 개발자가 탐색한 코드만 한정되게 보여주는 약점이 있다. 본 논문은 상향식 가시화 도구에서 연관이 되는 코드 정보를 제공하여 코드 탐색을 돕기 위하여 소프트웨어 개정 이력을 클래스 다이어그램으로 보이는 도구를 제시한다. 제시 도구는 개발자들이 커밋한 코드 정보를 한 번의 클릭으로 클래스 다이어그램으로 보여줌으로써, 개발자들의 코드 변경에 대한 빠른 이해를 돕는다. 또한 본 논문은 사례 연구를 통하여 개발자들이 수일동안 지속적인 변경 작업을 수행할 때 제시 도구가 유용할 수 있음을 보인다.

• 한국컴퓨터정보학회논문지
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• 제26권9호
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• pp.189-200
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• 2021

최근에 정보기술과 스마트폰 기술이 빠르게 발달되고 있다. 데이터가 증가함에 따라 빅데이터 시대에 도달하였다. 최근 언택트 시대가 도래함에 따라 QR코드는 우리 생활에서 밀접하게 운영되고 있다. 본 연구의 목적은 첫째, "QR Code"에 대한 선행연구를 살펴보고 분야별 키워드에 대한 분석을 실시한다. 둘째, 빅데이터 관점에서 데이터시각화를 위해 "QR Code"의 빈출키워드를 대상으로 워드클라우드 분석과 네트워크 분석을 실시한다. 셋째, "QR Code" 관련하여 향후 연구자들에게 연구방향을 제시하고자 한다. 분석결과 첫째, 연구동향을 살펴본 결과 연구가 증가추세에 있으며, 분야가 다양하게 활용되고 있음을 알 수 있었다. 둘째, 빈출 키워드 분석결과 전반적으로 유사한 결과가 도출되었으며, 분야별, 연도별에 따라 일부 차이가 있는 것으로 분석되었다. 셋째, 빈출 키워드에 따른 시각화 결과 역시 빈출 키워드 분석결과와 동일하게 분석되었다는 것을 알 수 있었다. 이론적 연구결과에 따른 실무적 시사점은 다음과 같다. 첫째, 'QR Code'를 기술적인 측면이 아닌 정보전달의 수단으로 연구될 필요가 있다. 둘째, "QR Code"는 사회 경향이나 이슈들을 반영하여 발전하고 있다는 것을 알 수 있다. 이론적 시사점과 실무적 시사점을 통해 우리는 QR 코드에 대한 방향성을 전략적으로 제공해주고자 한다.

• Nuclear Engineering and Technology
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• 제56권3호
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• pp.959-965
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• 2024

The High Temperature Test Unit (HTTU) was an experimental set-up to conduct separate and integral effects tests of the Pebble Bed Modular Reactor (PBMR) core. The annular core consisted of a randomly packed bed of uniform spheres. Natural convection tests using both nitrogen and helium, and forced convection tests using nitrogen, were conducted. The maximum material temperature achieved during forced convection testing was 1200 ℃. This paper presents the numerical analysis of the flow and temperature distribution for a forced convection test using 3D CFD as well as a 1D systems-CFD computer code. Several modelling approaches are possible, ranging from a fully explicit to a semi-implicit method that relies on correlations of their associated phenomena. For the comparison between codes, the analysis was performed using a porous media approach, where the conduction and radiative heat transfer were lumped together as an effective thermal conductivity and the convective heat transfer was correlated between the solid and gas phases. The results from both codes were validated against the experimental measurements. Favourable results were obtained, in particular by the systems-CFD code with minimal computational and time requirements.

• 한국주거학회논문집
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• 제17권1호
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• pp.145-153
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• 2006

Making of agreement with participation subjects is important process laying stress on presentation and a reasonable design guide line to form space order grant and synthetic space in Housing Complex plan. This study analyzed residing application specific character of design guide line that is presented to architects in general planning laying stress on plan only of 'Bongmu-dong town house' and design agreement of by architectural result that appear analyze. Result that analyze is as following: 1) Confer in 18 plan contents and integrate design or was adjusted. Being main conduct and unit plan and residing only in plan many negotiations accomplish. Architect who confer most Designs of 5 architects is 'Jean Michel Wilmott' and 'Shigeru Ban' 2) contents that confer much in plan main conduct and unit generation were details plan. Contents that is conferred with many architects are about door/core/rooftop be and asked a question about proper size of entrance. Negotiation about size was expose to the tribe of knowledge about element that do furniture and detail of necessary each space in life style of our country. We must present furnitures or detail element that appear by emotion of our country and detailed item of furnitures' size etc.. in guide line. It is immediate that creation of guide that architects can approach easily for lacking abroad architects of interests by code difference in each country is pressing. 3) In residing plan 4 architects of 5 architects applied similarly guide line in design. Most architects look by active support that make synthetic housing complex. and this is construed that act positively to make by unified residing. That plan of woods or landscape architecture and security of green area space are thing to approach on 'Environment-friendly mode of life residing only' that is general planning subject of 'Bongmu-dong town house'. 4) common question items of architects guide line of though is refered definitely when make out effective interests plan. So that can overcome legislation difference, countermeasure to make understood construction code of our country is pressing

• Nuclear Engineering and Technology
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• 제44권5호
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• pp.551-560
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• 2012

The Wolsong-1 (W-1) Phase-B pre-simulations were carried out in preparation for tests to be conducted for the restart of the reactor after a major refurbishment project that included replacement of the pressure tube. These pre-simulations for Wolsong-1 Phase-B differ from those in the past that were performed for the Wolsong-1,2,3,4 tests in that these tests use the WIMS/DRAGON/RFSP-IST code suite for verification of the tests and gadolinium instead of the traditional PPV/MULTICELL/RFSP code system and boron as poison in the moderator system. The use of gadolinium is deemed not to have domestically accumulated experience gained from the previous Phase-B tests. Thus, it is appropriate to conduct a study in order to gain a correct understanding and interpretation of potential differences in test results stemming from using gadolinium rather than boron. Although the calibration of the reactivity device will not be noticeably different using boron and gadolinium at a constant moderator temperature, the temperature dependency of the neutronic behavior due to the presence of gadolinium in the moderator system might be pronounced. The results of the pre-simulations using gadolinium revealed that the moderator temperature reactivity coefficients indeed showed significant differences in comparison with those with boron. In order to secure the validity of the analysis results, the newly acquired WIMS/DRAGON/RFSP-IST code suite was verified against the W-2,3,4 Phase-B test results. The results of the new code suite verifications revealed some overall improvements in accuracy; justification of the use of the code can be claimed for the validation of the W-1 Phase-B test results.