• 정보보호학회논문지
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• 제33권3호
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• pp.527-535
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• 2023

사이버 침해사고 대응 능력을 갖춘 전문가의 양성을 위해 여러 기관에서 사이버 훈련장을 구축하여 사이버 방호 전략을 갖춘 보안 전문가를 양성하고 있지만, 기존 시스템에서는 가상훈련 시스템 내 자원의 한계, 시나리오기반의 실습 콘텐츠 개발 및 운영, 비용적인 문제 등에 있어서 어려움을 겪는다. 이를 보완하기 위해 본 논문에서는 각 조직에 맞는 IT 인프라 환경에 대한 유사한 변이 환경을 제공하여 사이버 공방 훈련자가 다양한 경험을 축적할 수 있도록 하는 가상 인프라 변이 생성 프레임워크를 제안한다. 실험 및 평가를 위해 기존의 컨테이너를 IaC(Infrastructure-as-Code) 환경의 컨테이너로 전환하고 코드 내 변이할 수 있는 요소들을 데이터로 추출하여 자연어 처리 모델인 Word2Vec에 학습시켜 구성 데이터를 변이하여 새로운 코드를 생성하고 새로운 컨테이너환경을 제시한다.

• 터널과지하공간
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• 제32권2호
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• pp.144-159
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• 2022

본 연구에서는 지반의 열-수리-역학적 복합거동을 모델링하기 위한 순차적 접근법 기반의 시뮬레이터를 개발하고 적용된 연계해석 알고리즘의 계산성능을 분석하였다. 본 연구의 순차적 연계해석에서는 다공성 매질의 열 및 유체거동 분석을 위한 오픈소스 기반의 OpenGeoSys 수치코드와 역학해석을 위한 상용 소프트웨어 FLAC3D가 연동되었다. 해석해가 주어진 열-수리-역학적 복합거동 문제를 토대로 개발된 시뮬레이터에 대한 벤치마크 테스트가 수행되었다. 적용된 벤치마크 문제는 완전포화된 지반 내 점열원 작용 시 지반거동(시간에 따른 온도, 간극수압, 응력, 변형 변화)과 관계된다. 해석해와 수치해석 시뮬레이션 결과를 비교 분석하고 연계해석 시뮬레이터의 적정성을 조사하였다.

• 한국전자파학회지:전자파기술
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• 제6권1호
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• pp.66-76
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• 1995

본 논문에서는 다경로 페이딩 채널에서 DA/SSMA 시스템의 오율특성을 컴퓨터시뮬레이션을 통하여 성능분석을 하였다. 먼저 다경로 페이딩 채널을 모델링 하였으며, 채널의 특성을 알아보기 위하여 도플러 주파수와 신호의 대역폭, 시간지연 등을 변화시키면서 그때의 주파수 응답특성과 여러 형태에 대하여 살펴보았다. 그리고 모델링한 태널을 블럭코드와 콤볼루션코드로 성능을 비교하였으며 DS/SSMA 시스템에 적용하여 성능을 비교 분석하였다. 그 결과를 보면 상관기를 사용하지 않은 코딩 시스템의 수신기[5]보다 1~3[dB] 향상됨을 나타내었다.

• 대한기계학회논문집A
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• 제24권10호
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• pp.2619-2627
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• 2000

In this paper, the vibrational characteristics of a foot mount type gearbox for epicyclic gear train have been studied. The modal parameters and mode shapes of a gearbox have been computed using AN SYS code. Modal testing was carried out to verify the FEM analysis model. It has been shown that the analysis results are in good agreements with the experimental results. Harmonic analysis has been executed to verify the effect of thickness variance of gearbox housing on the modal response. Analyzing the calculated results, some guides for optimal vibration response has been deduced.

• 대한기계학회논문집
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• 제5권4호
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• pp.274-283
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• 1981

An inexpensive and very simple microcomputer-aided measurement system has been designed for on-line experiments, which perform simultaneously data acquisition, data recorditing, calculations with the data, and positioning of necessary sensors. Interfacting between the microcomputer and the data acquisition board which consists of A/D converter, analog multiplexer, and sample-and-holder, etc. has been done through IEEE-488 interface port and parallel user port both provided by the PET computer's main logic board. Data and control signals are transfered between devices without handshaking. By utilizing BASIC commands PEEK, POKE, SYS, USR which are offered by PET microcomputer, it is possible to link machine code subroutines into the main BASIC program. This facilitates ease of data transfer, programming, and speedy execution of the program. In addition, an X-Y scanning table has been concected to the system in order to automatically position measuring sensors along a pre-determined path of interest.

• Journal of applied mathematics & informatics
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• 제37권1_2호
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• pp.157-162
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• 2019

Programming tools are essential for students learning numerical analysis. It is troublesome to go to a laboratory where a computer is located after taking a lecture. Nowadays most students have mobile phones which can be used for programming practice through the Internet. PHP is a server-side scripting language designed for web development but also used as a general-purpose programming language. However, PHP has many inconveniences, such as adding a dollar symbol ($) to every varable. This paper introduces a slightly modified language, NAPHP, and a system which is designed for students to use their own mobile phone to write down the language NAPHP and run it on the web page. The system NAPHP-SYS is an educational tool that turns NAPHP into PHP, run PHP code and show the results on the web.

• 문화기술의 융합
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• 제4권3호
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• pp.221-226
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• 2018

특수목적 차량은 일반적으로 사용자의 요구에 따라 주문 제작된다. 이러한 차량들이 고장을 일으키는 경우에는 수리비용 및 시간이 많이 든다. 이러한 문제점들을 해결하고자 차량의 이상여부를 원격으로 점검하고 고장부위를 원격에서 파악하여 수리비용 및 수리 기간을 단축하고자 한다. 본 연구에서는 전기제어부의 고장부위를 자동으로 판별하고 이를 사용자의 휴대폰앱을 통하여 바로 파악하여 즉각적인 고장코드를 특장차 제조사측에 통보하여 고장수리를 빠르고 원활하게 하고자 한다. 이를 구현하기 위하여 IoT 사물인터넷의 기술을 이용하여 특수목적의 차량 분야의 현장에서 요구되는 항목에 따라 고장부위를 스스로 판단하고 기기 자체적으로 제작사측에 고장여부를 알려주는 시스템을 구축하고자 한다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 봄 학술발표회 논문집
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• pp.651-656
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• 2002

In general, the most important problem in slope stability analysis is that there is no definite way to describe the natural three-dimensional Joint network. Therefore, the many approaches were tried to anlayze the slope stability. Numerical modeling approach is one of the branch to resolve the complexity of natural system. UDEC, FLAC, and SWEDGE are widely used commercial code for the purpose on stability analysis. For the purpose on the more appropriate application of these kind of code, however, three-dimensional distribution of joint network must be identified in more explicit way. Remaining problem is to definitely describe the three dimensional network of joint and bedding, but it is almost impossible in practical sense. Three dimensional joint generation method with random number generation and the results of generation to UDEC have been applied to settle the refered problems in field site. However, this approach also has a important problem, and it is that joint network is generated only once. This problem lead to the limitation on the application to field case, in practical sense. To get rid of this limitation, Monte Carlo Simulation is proposed in this study 1) statistical analysis of input values and definition of the applied system with statistical parameter, 2) instead of the consideration of generated network as a real system, generated system is just taken as one reliable system, 3) present the design parameters, through the statistical analysis of ouput values Results of this study are not only the probability of failure, but also area of failure block, shear strength, normal strength and failure pattern, and all of these results are described in statistical parameters. The results of this study, shear strength, failure area, pattern etc, can provide the direct basement on the design, cutoff angle, support pattern, support strength and etc.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회 3차
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• pp.55-60
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• 2010

Rockfill zones in CFRD consist typically of large granular materials, usually the maximum particle size up to several meters, which makes laboratory testing to determine the mechanical properties of rockfill difficult. Commonly, the design strength of the rockfills is obtained by scaling down the original rockfill materials and performing laboratory strength tests for the reduced size materials. The objective of the present study is to investigate the effect of particle size on the shear behavior and the strength for granular materials. A series of large-scale triaxial tests was conducted on large granular materials with the maximum particle size varying from 20 to 50mm. The test results showed that overall shear behaviors were similar between the samples with different particle sizes while there were slight differences in the magnitudes of the peak shear stress between the samples. In addition, a simulation of the granular material with the max. particle size of 20mm was performed using DEM code, $PFC^{2D}$, and compared with the test results. The deviatoric stress versus strain behaviors of experimental and numerical tests were found to be matched well up to the peak stress state.

• 한국농공학회논문집
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• 제53권1호
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• pp.71-81
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• 2011

Due to increased human activities and intensive rainfall events in a watershed, soil erosion and sediment transport have been hot issues in many areas of the world. To evaluate soil erosion problems spatially and temporarily, many computer models have been developed and evaluated over the years. However, it would not be reasonable to apply the model to a watershed if topography and environment are different to some degrees. Also, source codes of these models are not always public for modification. The ArcGIS model builder provides ease-of-use interface to develop model by linking several processes and input/output data together. In addition, it would be much easier to modify/enhance the model developed by others. Thus, simple model was developed to decide soil erosion hot spot areas using ArcGIS model builder tool in this study. This tool was applied to a watershed to evaluate model performance. It was found that sediment yield was estimated to be 13.7 ton/ha/yr at the most severe soil erosion hot spot area in the study watershed. As shown in this study, the ArcGIS model builder is an efficient tool to develop simple models without professional programming abilities. The model, developed in this study, is available at http://www.EnvSys.co.kr/~sateec/toolbox for free download. This tool can be easily modified for further enhancement with simple operations within ArcGIS model builder interface. Although very simple soil erosion and sediment yield were developed using model builder and applied to study watershed for soil erosion hot spot area in this study. The approaches shown in this study provides insights for model development and code sharing for the researchers in the related areas.