• Journal of the Korean Society for Precision Engineering
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• v.18 no.5
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• pp.34-41
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• 2001

More accurate and fast inspection method for mechanical parts and structure is required to guarantee the safety. Conventional methods using compliance method, eddy current method, ultrasonic wave, acoustic emission for non-destructive testing in mechanical parts and structure have been performed as the method of contact with objects to be inspected. With this reason these methods have been taken relatively much time, money, and manpower. In this study, in order to overcome these shortcomings, we used In-plane Electronic Speckle pattern Interferometry(In-plane ESPI) that was full-field measurement and noncontact method. We detected the cracks of the specimen at a real time and measured the length of the crack by using In-place ESPI system. Finally, we compared this results with conventional microscope method.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.504-506
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• 2000

대표적 분산 미들웨어인 OMG CORBA 는 이질적인 하드웨어와 소프트웨어가 다양한 매체를 통해 네트워크로 연결된 분산 컴퓨팅 환경에서 객체 지향적 시스템을 통합 기반 환경을 제공한다. 그러나 CORBA를 구현한 상용이나 연구용 제품은 CORBA 규격을 정의된 대로 지원하지 않아 OMG에서 CORBA를 통해 성취하려고 하는 중요한 목표인 상호운용성과 이식성 보장되지 못하는 결과를 야기하고 있다. 이러한 문제의 해결은 CORBA 규격 준수 여부를 시험하는 시험 도구를 필요로 한다. CORBA 규격 시험 도구는 규격에 정의된 API 등을 시험하기 위한 많은 분산 시험사례와 이들의 실행을 자동으로 제어해 줄 수 있는 실행제어기가 기본적으로 필요하다. 본 논문은 CORBA 규격 시험을 위한 분산 시험사례를 자동으로 실행시키는 분산 시험사례 제어기의 설계와 구현에 대하여 기술한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.6
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• pp.1370-1378
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• 1996

A subjective video quality assessment methods are proposed based on CCIR Rec. 500-5 for an evaluation and testing of compressed video quality and performance of video codec to be designed in accordance with the MPEG-2 MP ML specification which is adapted as a DTV standard for Korea digital DBS. Video sequence compressed in compliance with MPEG-2 MP ML encoding parameterswastested by the proposed video quality evaluation procedure. Test sequence were compressed at the bit rate 6Mbps, 7.5Mbps and 9Mbps, repectively. Test results of the 7.5Mbps bitrate showed a satisfactory picture quality at about 4.0 on the 5.0 absolute scale of ITU-R 500-5.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.66 no.7
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• pp.1155-1161
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• 2017

This study examines environmental performance of the arcing measurement module according to international standards. The module assesses the collected current performance using a computer system. The module is required to assess environmental impact resulting from electromagnetic waves, shock and temperature change during train operation. The test includes testing EMI/EMC, vibration, shock and temperature cycling for interface between trains and the arcing measurement module. The module test items were determined in compliance with the standards suggested by the International Electrotechnical Commission (IEC) and Europaische Norm (EN). This study describes the method of test, test equipment operation and how to choose relevant performance standards. The analysis and test results of environmental performance for the module based on computer system are described in this study.

• Journal of Information Processing Systems
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• v.13 no.1
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• pp.26-39
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• 2017

The need for embedded devices to be able to exchange information with each other and with data centers is essential for the advent of the Internet of Things (IoT). Several existing communication protocols are designed for small devices including the message-queue telemetry transport (MQTT) protocol or the constrained application protocol (CoAP). However, most of the existing implementations are convenient for computers or smart phones but do not consider the strict constraints and limitations with regard resource usage, portability and configuration. In this paper, we report on an industrial research and development project which focuses on the design, implementation, testing and deployment of a MQTT module. The goal of this project is to develop this module for platforms having minimal RAM, flash code memory and processing power. This software module should be fully compliant with the MQTT protocol specification, portable, and inter-operable with other software stacks. In this paper, we present our approach based on abstraction layers to the design of the MQTT module and we discuss the compliance of the implementation with the requirements set including the MISRA static analysis requirements.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.629-631
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• 1999

최근의 분산처리 기술은 이질적인 분산환경에서의 상호 운용성을 보장하는 시스템통합 기술을 중심으로 발전해 나가고 있다. 이러한 환경을 제공하는 대표적 분산 미들웨어인 OMG CORBA는 현재 많은 산업체와 연구기관에서 구현하여 상용화하거나 연구용으로 제공하고 있다. 그러나 하나의 제품에서 개발된 CORBA 응용 프로그램을 다른 제품에서 이식에 필요한 코드 수정 없이 바로 사용할 수 없는 문제점을 보이고 있어 OMG에서 CORBA를 통해 성취하려고 하는 중요한 목표인 이식성과 상호운용성을 보장하지 못하고 있다. 본 논문은 Java 언어 매핑을 지원하는 ORB를 대상으로 위 문제의 해결에 필요한 CORBA 규격 준수 시험을 수행하는 ORB 기능 시험에 대하여 기술한다.

• International Journal of Reliability and Applications
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• v.4 no.4
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• pp.157-170
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• 2003

In this paper we apply statistical reliability tools to manage and seek improvements in the strengths of medium density fiberboard (MDF). As a part of the MDF manufacturing process, the product undergoes destructive testing at various intervals to determine compliance with customer′s specifications. Workers perform these tests over sampled cross sections of the MDF panel to measure the internal bond (IB) in pounds per square inches until failure. We explore both graphically and statistically this "pressure-to-failure" of MDF. Also, we briefly comment on reducing sources of variability in the IB of MDF.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.1017-1019
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• 2010

정보화 기술이 활발하게 진행되어 가운데 지리공간정보의 기술이 부각되고 있다. 유비쿼터스 시대로 접어 들면서 세상이 모든 것들이 위치를 가지게 된다. u-city, LBS, ITS 서비스 등 지리공간 데이터의 활용은 앞으로 무궁무진하게 커질 것이다. 이로 공간정보 유통시스템도 향후의 WEB 3.0기술을 고려하는 것이 필요하게 되었으며, 사용자 중심의 서비스 시대로 접어 들면서 공간정보의 민간 유통시스템 구축이 요구되고 있다. 본 논문에서는 공간정보의 민간 유통을 위한 메타데이터 표준 및 적합성 테스트 방안을 제시하였다.

• International Journal of Highway Engineering
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• v.7 no.4 s.26
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• pp.203-210
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• 2005

The penetration and viscosity tests have been used for the evaluation of the aged asphalt binder performance change. The improved test method has been required because the conventional tests could not evaluate the viscoelastic characteristics and the real behaviour of the aged asphalt binder. The conventional test methods using a different short term aged asphalt binder were tested and the test results were expressed as the penetration index and the residual penetration. The oscillatory and rotational mode tests were performed to find out the rheological characteristics of the short term aged asphalt binder in this study. The test results showed that the change of testing frequency, the speed of the vehicle effects the complex modules and phase angles. The creep compliance and shear viscosity also showed the different test results when the short term aged asphalt binders were tested. The rheological behavior should consider when the pavement design is conducted.

• Nuclear Engineering and Technology
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• v.38 no.7
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• pp.639-656
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• 2006

In order to apply the leak before break (LBB) concept to nuclear piping systems, the dynamic strain aging effect of low carbon steel materials has to be taken into account, in compliance with the requirements of the Korean Standard Review Guide (KSRG) 3.6.3-1. For this goal, J-R tests are needed for a range of various temperatures and loading rates, including dynamic loading conditions. In the dynamic loading J-R test, the unloading compliance method can not be applied to measure the crack growth and direct current potential drop (DCPD) method; this method also has a problem defining the crack initiation point. The normalization method is known as a very useful method to determine the J-R curve under dynamic loading because it does not need additional equipment or complicated loading sequences such as electric current or unloading. This method was accepted by the American Society for Testing and Materials (ASTM) as a standard test method E1820 A15 in 2001. However, it has not yet been clearly verified yet if the normalization method is sufficiently reliable to be applied to LBB. In this study, the basic background of the J-integral, LBB and dynamic loading J-R test are explained, and the current status for dynamic loading J-R test methods are reviewed from the view point of LBB for nuclear piping. In particular, the theoretical and historical background of the normalization method which has received attention recently, is summarized. Recent studies for this method are introduced and future works are suggested that may improve the reliability of LBB for nuclear piping.