• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.40 no.1
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• pp.6-22
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• 2011

• Proceedings of the Korean Nuclear Society Conference
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• 1999.05a
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• pp.175-175
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• 1999

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.42 no.4 s.304
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• pp.35-44
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• 2005

Face recognition out of biometrics is considerable interesting due to high performance and accessibility in applications to security such as access control and banking service. Therefore, a study on the protocol of the performance test is an important issue to understand the art-of state and to show a direction in future works, in addtion to developing algorithms. We present a design criterion for the performance test protocol of face recognition system and show the result of experiment executed on identification and verification scenario based on PCA algorithm and XM2VTS DB

• Aerospace Engineering and Technology
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• v.7 no.2
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• pp.117-122
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• 2008

Acoustic test was performed to verify the ability of KSLV-I PLF acoustic protection system (Acoustic blanket) to reduce the acoustic load. The test results showed that the acoustic protection system has +3 dB safety margin compared with design requirement. This paper also illustrates the increase of insertion loss by the acoustic protection system by comparing that of the bare PLF structure.

• Composites Research
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• v.32 no.1
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• pp.78-84
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• 2019

This study focused on the prediction of the long-term performance of carbon fiber/epoxy composites using Dynamic Mechanical Analysis (DMA) and Time-Temperature Superposition (TTS). Single-frequency test, multi-frequency test, and creep TTS test were performed. A sinusoidal load of $20{\mu}m$ amplitude was applied while increasing the temperature from $-30^{\circ}C$ to $240^{\circ}C$ at $2^{\circ}C/min$ for the single-frequency test and the multi-frequency test. The frequencies applied to the multi-frequency test were 0.316, 1, 3.16, 10 and 31.6 Hz. In the creep TTS test, a stress of 15 MPa was applied for 10 minutes at every $10^{\circ}C$ from $-30^{\circ}C$ to $230^{\circ}C$. The glass transition temperature was determined by single-frequency test. The activation energy and the storage modulus curve for each temperature were obtained from glass transition temperature for each frequency by the multi-frequency test. The master curve for the reference temperature was obtained by applying the shift factor using the Arrhenius equation. Also, TTS test was used to obtain the creep compliance curves for each temperature and the master curve for the reference temperature by applying the shift factors using the manual shift technique. The master curve obtained through this process can be applied to predict the long-term performance of carbon fiber/epoxy composites for a given environmental condition.

• Fire Science and Engineering
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• v.24 no.2
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• pp.44-51
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• 2010

This study, to develop the technology of the fire resistance design of CFT structure based on fire resistance performance design, was suppose to use as basic data for performance design through a measure of temperature and deformation of the CFT specimen as parameter is the concrete compressive strength and load ratio. In accordance with KS F 2257-1 and 7, 24 MPa and 40 MPa and the load ratio of 0.9, 0.6 and 0.2 were imposed on a square column and as a result of evaluating in accordance with the fire resistance criteria, in case of 24 MPa, the fire resistance performance was improved by 73 minutes when the load ratio was reduced by 0.3. And when it comes to 40 MPa, the fire resistance was 31 minutes and 180 minutes when a load ratio was 0.6 and 0.2, respectively. As a result of evaluating fire resistant performance depending on variation of internal concrete strength, it proved that the higher the strength the lower the fire resistance.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2013.04a
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• pp.152-153
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• 2013

CO복합형 무선식 단독경보형감지기는 화재감지기에 CO센서를 장착하여 화재감지는 물론 불완전연소가스로 인한 질식방지를 위한 경보기능을 내장하고 있으며, 주택내부에 설치된 감지기 중 하나가 동작되었을 때 침실이나 거실에 설치된 모든 단독형감지기가 동시에 경보를 발할 수 있는 화재신호 무선연동기능을 보유하고 있다. 우리나라에는 현재까지 세부적인 기술기준이 정해져 있지 않기 때문에 이 논문을 통하여 CO복합형 무선식 단독경보형감지기의 성능시험기준을 미국, 일본과 비교하여 분석하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1551-1552
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• 2015

현재 태양광인버터의 안전성확보에 대한 기술기준이 IEC로부터 채택하게 됨과 동시에 독일, 일본, 미국 등 선진 각국에서는 안전성 확보용 기술기준을 적용하고 있으며, 강제(Mandatary) 규격으로 적용하고 있는 상태이다. 그러나 국내 태양광인버터분야는 인버터의 성능만 수행하고 있는 상태이며, 안전성분야는 전무한 상태이다. 따라서 본 논문에서는 성능위주의 특성에서 벗어나 사용자의 보호 및 안전성을 중심으로 CE, UL 등의 해외인증에서 요구하는 기준으로 자리를 잡아가고 있는 IEC 62109 표준화에 대한 정확한 기술기준 및 시험방법에 대해 살펴본다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.11a
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• pp.75-76
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• 2019

enhanced Loran의 핵심은 기존의 Loran 송신국들이 세계협정시(UTC(Coordinated Universal Time))와 일치된 시각을 사용함으로써 동일한 체인 내에서 뿐만 아니라 이웃 체인을 이용할 수도 있다는 것이다. 즉, 수신 가능한 모든 Loran 송신국의 신호를 수신함으로써 위치, 항법, 타이밍의 정확도를 높일 수 있다. 따라서 각 Loran 송신국들은 적절한 동기 방법을 활용하여 UTC에 동기된 Loran 신호를 생성해야 한다. 해양수산부에서는 eLoran 성능 테스트를 위해 기존의 포항, 광주 외에 추가 한 곳으로 인천지역에 시험 송신국을 구축하고 있다. 또한 포항, 광주 송신국의 로란 신호를 UTC에 동기시키는 현대화를 추진함으로써 성능 검증을 위한 eLoran 테스트 베드를 구축하고 있다. eLoran 송신국들은 UTC와의 시각동기가 반드시 필요하므로 이를 위해 테스트베드 송선국의 기준시를 생성하기 위한 시스템과 그 기준시를 UTC와의 동기시키기 위한 시스템을 개발 및 구축하였다.

• International Journal of Highway Engineering
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• v.13 no.4
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• pp.9-17
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• 2011

It is possible to set up the Roadside Barrier which is suitable for Performance Evaluation Criteria by domestic standard. But a number of section of expressway roadside have old guardrail that was installed before reform the guideline. These poor performance guardrails threaten driver's life. There is lots of difficult problem to change old guardrails that are installed 2,777km in expressway of whole road side at the same time. Especially budget problem. The purpose of study is to develop performance improvement guardrails by the minimum reinforcement. In this study, guardrail improvement method(SB1, 3, 5 grade) is developed through crash simulation using LS-DYNA 3D and vehicle crash test. And it's expected not only to decrease of collision accident but to increase safe level. Of course one thing that can't be missing is to reduce a lot of budget of guardrail change.