• Proceedings of the KSR Conference
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• 2006.11b
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• pp.1156-1164
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• 2006

According to Korean railway safety law and its ordinances, the Korean railway standard(KRS)s to recommend railway operators and manufacturers the regulations for safety and inter-operability of railway system were enacted in the early 2006. In order to reflect rapidly advancing railway technologies and correspond to the international railway standard led by Europe and Japan, KRSs should be confirmed and revised continuously. This paper deals with recent trends in enacting international standards by IEC and the Europe and Japan's activities for this, and presents advancement directions for KRS.

• Progress in Superconductivity and Cryogenics
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• v.14 no.4
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• pp.16-19
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• 2012

In power cables as one of the important power applications adopting HTS tapes, a good insulation should be kept at its optimum performance. As an insulation material for superconducting device applications, polypropylene laminated paper (PPLP) is now widely used instead of the conventional Kraft paper. In addition to its dielectric property, the insulation material should also possess superior mechanical property at cryogenic temperatures and operability that is necessary for the insulation winding process. This study aims to evaluate the mechanical property of the PPLP material at ambient and cryogenic temperatures. At cryogenic temperature, the failure stress of PPLP increased significantly as compared with that at ambient temperature. The failure stress at both temperatures depended upon the sample orientation to the load application.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.626-628
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• 2003

웹 지리정보시스템은 사용하기 쉬운 사용자 인터페이스를 제공함으로써 사용자들로 하여금 공간 데이터의 접근과 분석기능을 쉽게 제공한다. 그러나 이들 시스템들은 독자적인 지리 데이터로의 접근만을 허용하고 분산되어 있는 지리 데이터로 접근할 수 없다. 이는 지리 데이터의 구조와 액세스 방법 등이 서로 상이하기 때문이다. 본 논문에서는 OLE DB을 기반으로 한 분산 지리 데이터의 상호운영성에 대한 기술한다. 또한 분산 지리데이터 서버에서 전달된 데이터는 웬 기반 환경에서 효율적으로 사용되기 위하여 XML 기반의 GML로 변환되어 진다. GML 은 지리정보시스템을 위한 XML기반의 웹 언어로 본문에서는 이를 기술한다. 본 시스템은 컴포넌트 형태로 제공함으로써 구축 비용 및 다양한 사양한 요구사항을 효율적으로 충족시킬 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11a
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• pp.23-26
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• 2002

MPV(MultiPhoto/Video)는 디지털 기기 간의 상호-연동성(Inter-operability)를 향상시키고, 사용자의 컨텐츠 관리를 용이하게 하기 위해서 제안되고 있는 표준안이다. MPV에서는 사용자의 편의를 위해서 데이터 부분에 해당하는 컨텐츠를 직접 관리하지 않고 XML 포맷으로 형성되는 메타데이터(Metadata)를 통하여 관리를 하게 되는데, MPV 와 관계 없는 소프트웨어에 의해서 컨텐츠의 정보가 변경되면, 이를 바로 잡을 수 있도록 복구 알고리즘을 제안하고 있다. 하지만. 제안된 알고리즘은 속도가 매우 느리다는 단점을 가지고 있어, 본 논문에서 이의 속도 및 효율를 향상시킬 수 있는 두 가지 알고리즘을 제안한다.

• 한국정보통신설비학회:학술대회논문집
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• 2008.08a
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• pp.257-261
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• 2008

The Digital Radio Mondiale (DRM) system is a digital broadcasting standard designed for use in the LF, MF and HF bands of the broadcasting bands below 30 MHz. The system provides both superior audio quality and improved user services / operability compared with existing AM transmissions. In this paper, we propose a variable point Prime Factor FFT design method for Digital Radio Mondiale (DRM) system. Proposed method processes a various size IFFT/FFT of Robustness Mode on DRM standard efficiently by composing Radix-Prime Factor FFT Processing Unit of form similar to Radix-4 by insertion of a variable Prime Factor Twiddle Factor and Garbage data. So, we improved limitation that cannot process 112/176/256/288 FFT of each mode of DRM system with a existent Radix Processor and increase memory size and memory access time for IFFT/FFT processing by software processing in case of implementation with a existent high speed DSP.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.655-657
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• 2004

본 논문은 안전등급 제어 기 기(Programmable Logic Controller) 에서 동작하는 실시간 운영체제의 안전성을 요구사항 단계에서 평가할 수 있는 검토항목을 개발하고 HAZOP(Hazard and Operability) 을 이용하여 현재 개발중인 PLC 운영체제에 적용한 경험 을 기술한다. HAZOP은 화학공장과 같은 산업에서 안전성을 평가하기 위한 방법으로 사용했던 방법론이다. 원자력발전소에 적용하기 위해 운영체제가 갖추어야 할 안전성 요건은 NUREG-0800의 BTP-14(Branch Technical Position)의 소프트웨어 기능특성 및 공정특성에 기술되어 있다. 이러한 기능적인 특성을 정확도, 신뢰성, 타이밍/사이징, 기능성, 강인성, 보안성 항목으로 나누고 세부적인 검토리스트를 만들어 HAZOP을 적용하여 평가하였다.

• Journal of the Korea Society of Computer and Information
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• v.20 no.8
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• pp.45-52
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• 2015

To solve the problem of low inter-operability of systems and low reusability caused by not being standardized and common-shared development foundation between software developers, the government has proposed e-Government(eGov) standard framework. However, the development method based on eGov standard framework is not easy to learn and to use fluently, because it is so dissimilar the existing traditional development method. In this paper, we propose an approach for developing web applications by reusing common components of eGov standard framework, and describe about the case study of developing Can_Pro(Computer Aided Nutritional analysis program for Professionals) based on eGov standard framework. Consequently, we show improvement in productivity and reduction budget through reusability of common components and eGov standard framework.

• Journal of Korea Multimedia Society
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• v.24 no.11
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• pp.1472-1480
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• 2021

Image stacking technique is one of the key techniques for complex surface reconstruction. The process includes sample collection, image processing, algorithm editing, surface reconstruction, and finally reaching reliable conclusions. Since this experiment is based on laser scanning confocal microscope to collect the original contour information of the sample, it is necessary to briefly introduce the relevant principle and operation method of laser scanning confocal microscope. After that, the original image is collected and processed, and the data is expanded by interpolation method. Meanwhile, several methods of surface reconstruction are listed. After comparing the advantages and disadvantages of each method, one-dimensional interpolation and volume rendering are finally used to reconstruct the 3D model. The experimental results show that the final 3d surface modeling is more consistent with the appearance information of the original samples. At the same time, the algorithm is simple and easy to understand, strong operability, and can meet the requirements of surface reconstruction of different types of samples.

• Journal of Drive and Control
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• v.16 no.1
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• pp.22-28
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• 2019

This paper develops ABS braking real - time simulator to develop vehicle braking system by simulation. Recently, real-time simulation is widely used in the development of vehicles to decrease development time. In the field of electronic braking, real-time simulation is actively underway. In order to simulate electronic braking model in real time, a vehicle model, a hydraulic model, and a control S/W model are required. These models must be calculated in one platform. Therefore, in this paper, a vehicle model composed of CarSim and a hydraulic model composed of SimulationX using S/W in actual ABS controller was developed as a Simulink model base and linked with Matlab real time model. Using this real-time model, design effects of the electronic braking controller were simulated according to road surface condition to verify its operability.

• Journal of the Korean Society of Systems Engineering
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• v.16 no.2
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• pp.16-26
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• 2020

Improving operator performance in complex and time-critical situations is critical to maintain plant safety and operability. These situations require quick detection, diagnosis, and mitigation actions to recover from the root cause of failure. One of the key challenges for operators in nuclear power plants is information management and following the control procedures and instructions. Nowadays Digital Twin technology can be used for analyzing and fast detection of failures and transient situations with the recommender system to provide the operator or maintenance engineer with recommended action to be carried out. Systems engineering approach (SE) is used in developing a digital twin for the CEDM system to support operator actions when there is a misalignment in the control element assembly group. Systems engineering is introduced for identifying the requirements, operational concept, and associated verification and validation steps required in the development process. The system developed by using a machine learning algorithm with a text mining technique to extract the required actions from limiting conditions for operations (LCO) or procedures that represent certain tasks.