• The Journal of Korean Association of Computer Education
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• v.8 no.2
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• pp.33-40
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• 2005

It has been found that the learning method based on conventional CAI(Computer Assisted Instruction) to be inadequate and inefficient as it is designed without considering the individual learning characteristics of the learners. In order to rectify and remedy the problem, the development of an ITS(Intelligent Tutoring System) that is adequately equipped with an artificial intelligence that successfully interprets the individual learning ability characteristics through accumulated individual data is in order. This study attempts to verify the individual acquisition ability and the possible error committed by learners in the process of learning in order to present the elements to be considered for designing a successful student module that enables the effective learning through the 'learner ability grouping' for learning Electronic Calculator Architecture.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.12 no.2
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• pp.45-53
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• 1998

This paper describes the development of educational and training package with Integrated graphic environment for power system analysis '||'&'||' operation. This package runs on a personal computer with interactive scheme and includes a graphic editor for modeling of power system, a database system, the various graphic illustration '||'&'||' animation modules to represent the simulation results, and the application module of the power system analysis '||'&'||' operation. The proposed package is tested on a sample system, the package will be useful for the education and training of power system analysis and operation.

• Journal of Advanced Navigation Technology
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• v.14 no.6
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• pp.874-881
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• 2010

A automatic flight control system(AFCS) of UAS needs to control its flight path along target path exactly as adjusts flight coefficient itself depending on static or dynamic changes of airplane's features such as type, size or weight. In this paper, we propose system which tunes control gain autonomously depending on change of airplane's feature in flight as adding MLM(Machine Learning Module) on AFCS. MLM is designed with Linear Regression algorithm and Reinforcement Learning and it includes EvM(Evaluation Module) which evaluates learned control gain from MLM and verified system. This system is tested on beaver FDC simulator and we present its analysed result.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.157-160
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• 2004

본 논문은 미국 차세대 디지털 케이블 방송 표준 규격인 오픈케이블($OpenCable^{TM}$)의 수신제한 모듈인 CableCard의 Physical Layer를 SystemC의 TLM(Transaction Level Modeling)과 RTL(Register-Transfer Level) 모델링 기법으로 설계하였다. 본 논문에서 설계한 CableCard의 Physical Layer는 PCMCIA Interface, Command Inteface 그리고 MPEG-2 TS Interface 로 구성된다. CableCard가 전원이 인가될 때, 카드 초기화를 위하여 동작하는 PCMCIA 인터페이스는 16 비트 PC 카드 SRAM 타입으로 2MByte Memory와 100ns access time으로 동작할 수 있게 설계하였다. PCMCIA 카드 초기화 동작이 완료된 후, CableCard의 기능을 수행하기 위하여 두 개의 논리적 인터페이스가 정의되는데 하나는 MPEG-2 TS 인터페이스이고, 다른 하나는 호스트(셋톱박스)와 모듈 사이의 명령어들을 전달하는 명령어 인터페이스(Command Interface)이다. 명령어 인터페이스(Command Interface)는 셋톱박스의 CPU와 통신하기 위한 1KByte의 Data Channel과 OOB(Out-Of-Band) 통신을 위한 4KByte의 Extended Channel 로 구성되고, 최대 20Mbits/s까지 동작한다. 그리고 MPEG-2 TS는 100Mbits/s까지 동작을 수행할 수 있게 설계하였다. 설계한 코드를 실행한 후, Cadence사의 SimVision을 통해서 타이밍 시뮬레이션을 검증하였다.

• Journal of the Korea Society of Computer and Information
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• v.28 no.9
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• pp.1-8
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• 2023

This paper presents the control strategy of Auto-leveling equipment (ALE) of Multi-function radar (MFR) for vehicle using Embedded System. MFR implements surveillance patrol missions such as surface-to-air missiles and fighters with constant rotation. ALE consists of 4 Auto-leveling modules (ALM) and retains the stability with maintaining level. The gradient of vehicle can be measured and controlled by embedded systems. This paper contributes for improvement the system design with the ALM 1 set modeling. The validity of the modeling is verified using MATLAB/Simulink.

• Journal of the Institute of Convergence Signal Processing
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• v.11 no.2
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• pp.177-182
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• 2010

The flow of a universal system-level design methodology consists of system specification, system-level hardware/software partitioning, co-design, co-verification using virtual or physical prototype, and system integration. In the developing process of a hardware component in system, the design phase has been regarded as a phase consuming lots of time and cost. However, the verification phase in which functionality of the designed component is verified has recently been considered as a much important phase. In this paper, the implementation of a verification environment which is based on SystemC infrastructure and verifies the functionality of a hardware component is described. The proposed verification system uses SystemC user-defined channel as communication interface between variables of SystemC module and registers of Verilog module. The functional verification of an UART is performed on the proposed verification system. SystemC provides class library for hardware modeling and has an advantage of being able to design a system consisting hardware and software in higher abstraction level than register transfer level. Source codes of SystemC modules are reusable with a minor adaptation on verifying functionality of another hardware component.

• Journal of the Korea Society for Simulation
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• v.18 no.4
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• pp.127-136
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• 2009

Modeling and Simulation, especially in mobile ad hoc network(MANET), are the most effective way to analyze performance or optimize system parameters without establishing real network environment. Focusing mainly on overall network behaviors in MANET concerns dynamics of network transport operations, which can efficiently be characterized with event based system states rather than execution details of protocols. We thus consider the network as a discrete event system to analyze dynamics of network transport performance. Zeigler's set-theoretic DEVS(Discrete Event Systems Specification) formalism can support specification of a discrete event system in hierarchical, modular manner. The DEVSim++ simulation environment can not only provide a rigorous modeling methodology based on the DEVS formalism but also support modelers to develop discrete event models using the hierarchical composition methodology in object-orientation. This environment however hardly supports to specify connection paths of network nodes, which are continuously altered due to mobility of nodes. This paper proposes a DEVS-based modeling and simulation methodology of enabling node mobility, and develops DEVS models for the mobile ad hoc network. We also simulate developed models with the DEVSim++ engine to verify the proposal.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.32 no.5
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• pp.333-340
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• 2019

Tests using a middle velocity propulsion impact machine (MVPIM) were performed to verify the impact resistance capability of sandwich concrete panels (SCP) in a modular liquefied natural gas (LNG) outer tank, and numerical models were constructed and analyzed. $2{\times}2m$ specimens with plain sectional characteristics and specimens including a joint section were used. A 51 kg missile was accelerated above 45 m/s and impacted to have the design code kinetic energy. Impact tests were performed twice according to the design code and once for the doubled impact speed. The numerical models for simulating impact behaviors were created by LS-DYNA. The external steel plate and filled concrete of the panel were modeled as solid elements, the studs as beam elements, and the steel plates as elasto-plastic material with fractures; the CSCM material model was used for concrete. The front plate deformations demonstrated good agreement with those of other tests. However the rear plate deformations were less. In the doubled speed test for the plain section specimen, the missile punctured both plates; however, the front plate was only fractured in the numerical analysis. The impact energy of the missile was transferred to the filled concrete in the numerical analysis.

• Journal of Energy Engineering
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• v.8 no.1
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• pp.159-165
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• 1999

복합화력 발전플랜트의 운전에서 특히 하절기의 첨두부하시에 외기온도의 상승으로 인한 가스터빈의 출력 감소를 해결하기 위한 방법으로 LNG 연료가 보유하고 있는 냉열을 이용하여 압축기로 유입되는 공기 온도를 감소시키는 냉각시스템의 개념을 개발하고자 복합화력 발전플랜트에 대한 설계점 및 외기온도 변화에 대한 탈설계점 모델링 연구를 수행하였다. 대상 프랜트는 940 MW 서인천 복합 발전플랜트 모듈의 단위 블록을 선택하였으며 발전플랜트 전용 해석코드인 GateCycle을 이용하여 가스터빈과 증기사이클의 주요 기기 들에 대한 모델을 개발하였다. 개발된 모델의 결과를 대상플랜트의 시운전결과와 비교하여 모델의 적정성을 검증하였다. 출력, 효율, 온도 및 유량 등 주요 설계인자들이 최대 ~1.3%의 상대오차 범위 안에서 만족할 만한 신뢰도를 갖는 것을 확인하였다. 탈설계점 성능해석은 본 논문과 관련한 연구의 주목적인 LNG 냉열에 의한 유입공기 냉각시스템 설계시의 경계변수인 외기온도 증가에 대한 각 사이클의 특성변화를 대상으로 하였다. 종합적으로 외기온도가 증가하면 압축기로 유입되는 공기의 양과 이에 대응하는 소요 연료량이 동시에 감소하므로 연소에 따른 가스터빈의 팽창비가 감소한다. 이로 인하여 외기온도 증가시에 가스터빈 출력감소율은 0.5%/$^{\circ}C$로서 배기가스를 이용하는 증기사이클의 출력감소율 0.2%/$^{\circ}C$에 비해 민감하므로 가스터빈 유입공기의 냉각시스템의 설계는 복합화력발전 플랜트의 효율 향상에 크게 기여할 것으로 예상된다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.07a
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• pp.220-223
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• 2010

최근 연이은 3D 영화의 성공에 힘입어 영화 산업계를 중심으로 3D 콘텐츠 생성이 늘고 있으며, 이를 가정 내에서도 즐길 수 있도록 다양한 3DTV가 출시되고 있다. 그러나 3DTV의 특성 상 3D 재생 시 밝기 저하에 따른 색 재현 문제로 인하여 입체감과 공간감을 느끼는 대신 2D에서의 화려한 색감을 만끽할 수 없게 되었다. 이에 본 논문은 3D 시청 시에도 2D에서와 같은 색감을 최대한 제공하기 위한 방법에 대해 연구하였다. 이를 위하여 3DTV를 활용하여 입력 RGB 영상에 대하여 2D와 3D 재생 시 재현되는 RGB intensity를 측정한 후 입출력에 따른 관계 모델링을 실시하였고, 모델링에 근거하여 3D 재생 시 2D 대비 보정되어야 할 색상 요소에 대한 매핑 테이블(mapping table)을 생성하였다. 생성된 매핑 테이블은 기존 3DTV 시스템의 출력부에 3D 색상 보정 모듈로써 추가하도록 하여 일반 2D 재생 시에는 입력영상이 바이패스(bypass)되도록 하고, 3D 재생 시에는 본 논문에 의한 3D 색상 보정용 매핑 테이블을 통해 색상 보정 과정을 수행하도록 하여 3D 재생 시에도 2D에서 느낄 수 있는 색감을 재현할 수 있도록 하였다.