• 문화기술의 융합
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• 제9권3호
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• pp.789-795
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• 2023

디지털 트윈은 디지털 공간에서 시뮬레이션 및 최적화함으로써 스마트팩토리 구현에 중요한 핵심 기술로 인식되고 있으며 이러한 시스템을 구현하기 위해서는 상호 운용성과 이기종 플랫폼 간 연결에 강점을 보이는 IEC62541 기반의 OPC-UA 프로토콜을 채택하고 있다. 이에 본 논문에서는 이기종 플랫폼 간 연결할 산업용 IoT 시스템을 설계 및 구현하고, IEC 62541기반으로 OPC-UA 시뮬레이터를 제안하여, 개발한 시뮬레이터를 통해 실제 제조현장의 온도, 압력, 유량 등 센서에서 수집되는 데이터를 디지털 트윈 플랫폼에 적용해 동작하는지를 제시하고, 이에 대한 성능시험 및 평가를 진행하였다. 제안한 디바이스에서 경량화된 디지털 트윈 플랫폼의 동작 성능과 OPC-UA 성능 평가를 진행하여 최적의 IEC62514기반 IIoT 시뮬레이터 시스템을 제안한다. 제안한 IIoT 시뮬레이터에서는 OPC-UA 랩핑으로 데이터를 송/수신하는 성능평가를 진행하고, 경량화된 디지털 트윈 플랫폼이 운영됨을 알 수 있다. 이 연구는 한정된 자원을 사용하는 제조 현장에서 스마트 팩토리 및 메타팩토리 구현을 위한 OPC-UA 프로토콜을 적용할 수 있으며, OPC-UA 시뮬레이터를 통해 현장에서의 시간 및 공간의 낭비를 최소화하고, 효율성을 크게 기여할 것으로 기대한다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2012년도 한국컴퓨터종합학술대회논문집 Vol.39 No.1(A)
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• pp.182-184
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• 2012

산업분야에서 이용되는 이력 데이터는 압력, 부피, 온도, 볼트, 전류, 전압 등 각종 제어기나 센서에서 발생하는 입력 정보를 일정 시간 간격으로 수집되는 데이터로, 데이터의 값이 일정하거나 값의 폭이 좁고, 많게는 수만 개의 포인트가 실시간으로 수집, 저장되어지는 대용량의 데이터라는 특징이 있다. 이러한 특성을 지닌 이력 데이터는 이력의 모든 데이터를 저장하지 않고, 전체를 대표하는 데이터의 일부만을 저장함으로써 이력 데이터의 효율적인 관리와 공간효율을 극대화시킬 수 있다. 이러한 이력 데이터를 효과적으로 관리하고, 보관하기 위해 이력 데이터 압축 알고리즘에 대한 개발과 연구가 진행 중이다. 그러나 이미 알려져 있는 이력 데이터 압축 알고리즘과 개발하고 있는 알고리즘의 성능에 대한 평가를 할 수 있는 시뮬레이터는 개인이나 소규모 집단만을 위해 만들어지거나, 공개되지 않고 있어 사용하기에 제한적이다. 이에 이력 데이터 압축 성능평가를 위한 시뮬레이터인 HDCS(Historical Data Compression Simulator)를 설계하고 구현하고자 한다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.37-40
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• 2014

Capturing the carbon dioxide emitted from coal-fired power plants will be necessary if targeted reduction in carbon emissions is to be achieved. Modelling and simulation are the base for optimal operation and control in thermal power plant and also play an important role in energy savings. This study aims to analyze the performance of supercritical coal fired power plant through steady and dynamic simulation using a commercial software gCCS. A whole power plant has been modeled and validated with design data of 500 MWe power plant, base and part load operations of the plant were also evaluated, consequently it had been proven that the simulated result had a good agreement with actual operating data. In addition, the effect of co-firng on the plant efficiency and flue gases were investigated using gCCS simulator.

• 상하수도학회지
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• 제18권1호
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• pp.5-14
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• 2004

A feasibility of using Particle Entrainment Simulator (PES) to evaluate model variables describing sediment entrainment in a river system was investigated. PES in a laboratory was utilized to simulate the sediment resuspension phenomenon in the river and the subsequent relationship between shear rate and sediment entrainment was developed. The total suspended solids (TSS) data from PES was incorporated into statistical models in an effort to describe behaviors of net particle movement in the river. PES was found to be adequate for simulating particle entrainment phenomenon in a river system. Statistical analysis was used to assess propriety of PES data for predictive purposes. The results showed good relationships between PES results and system variables, such as average stream velocity and net particle movement.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.852-856
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• 2005

This paper proposes a new design of the ECG simulator with high resolution by using small amount of memories based on discrete least square estimation equations instead of reading the stored data inside the look-up table. The experimental results have shown that the ECG simulator using discrete least square estimation equations can display the bipolar limb leads ECG signals with low PRD (percent root-mean-square difference) while taking the less amount of memories than the previous method which used the look-up table to store ECG data for ECG simulation.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.321-326
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• 1997

This paper present how VRML file format can be used for RP Technology. VRML standards provids compact and powerful interface between remote RP manufacturer in network independent environment. We have constructed integrated and network-connected server system which can share the CAD data and varios process which is STL-to-VRML translater,slicing process,slice anchor process etc. This Server system consisted in file converter between STL and VRML,CGI system which sends a generated data to VRML client or browser, slice-generator which can re-slice at varied thickness and simulator which can show and check simultaneously status between near slices with support. This system aims to the integrated simulator which supports graphic animator and FEA analysis system.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 추계학술대회논문집B
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• pp.341-346
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• 2000

A numerical simulation has been carried out for the engine cooling system. It is the important element to analysis of heat transfer process in cooling system for an automotive engine. Thus, the purpose of this simulator is to present useful information at the early stages of the design of the cooling system by enabling the development engineer to predict performance trends. This program has useful window interface for analysis of the cooling system and it is convenient for user to control data with relational database. The system was simulated and compared with experimental data. As a result, the inlet, outlet temperature of the radiator by the simulator agrees well with it. It is concluded that this simulation program is available in developing the cooling system for a new car.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.296-299
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• 2001

We developed a motion capture system to get angle data of human joints in the walking mode. The motion capture system is a pair of leg-shape device, which is composed of three links with ankle, knee and pelvis joints. The sensors for measurement of the joint angle are potentiometers. We used an A/D converter to get digital data from joint angles, and which are used to simulate and coordinate the biped-walking robot developed in our laboratory. To simulate and analyze walking motion, animation based on three-dimension motion is performed using the open inventor software.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1995년도 추계학술발표회논문집(1)
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• pp.117-122
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• 1995

An Integrated Test Facility(ITF) is a human factors experimental environment to evaluate an advanced man machine interface(MMI) design. The ITF includes a human machine simulator(HMS) comprised of a nuclear power plant function simulator, man-machine interface, experiment control station for the experiment control and design, human behavioural data measurement system, and data analysis and experiment evaluation supporting system(DAEXESS). The most important features of ITF is to secure the flexibility and expandibility of Man Machine Interlace(MMI) design to change easily the environment of experiments to accomplish the experiment's objects In this paper, we describe a development scope and characteristics of the ITF such as, hardware and software development scope and characteristics, system thermohydraulic modelling characteristics, and experiment station characteristics for the experiment variables design and control, to be used as an experiment environment for the evaluation of VDU-based control room.

• 대한임베디드공학회논문지
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• 제10권2호
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• pp.73-79
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• 2015

Dynamic culling scheme is usually implemented to handle overhead caused by rendering the massive large-scale terrain data in flight simulator. However, existing culling scheme without considering altitude is not suitable for flight simulator due to additional computational overhead. To solve this problem, in this paper, we propose hybrid approach by applying two dynamic culling schemes depending on altitude. In addition, we remove unnessary computational overhead by creating different z-map resolution when aircraft changes its altitude. The proposed scheme is implemented with open graphic library and tested with real terrain data. Through the experimental results, we can recognize the improved rendering speed about 8 to 73 percents as compared to existing scheme.