• Proceedings of KOSOMES biannual meeting
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• 2003.11a
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• pp.141-148
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• 2003

Yaw-checking and course-keeping ability in IMO's ship manoeuvrability standards is reviewed from the viewpoint cf sole navigation Three kinds of virtual series-ships, which have different course instability, are taken as test models. The numerical simulation on Z-test is carried out in order to examine the correlation between known manoeuvrability in spiral characteristics and various kinds of overshoot angle. Then simulator experiments are executed with series-ships in a curoed, narrow waterway by six operators(five active pilots and one ex-captain) in order to examine the correlation between known manoeuvrability and degree of manoeuvring difficulty. IMO criteria for yaw-checking and course-keeping ability are discussed and revised criteria are proposed.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.748-753
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• 2011

Generally, in the temperature and environment test of railway electronics, cold and heat resistant tests are involved. Relevant KRS standards describe "There is no problem" as acceptance criteria for function check during the temperature and environment tests. According to this requirement, testers perform some function and performance tests which are easy to perform during test procedure using temperature chamber. This paper reviews the limit of current check method for cold and heat resistant tests and proposes an alternative. An alternative is the application of data sheet. Using data sheet, the temperature of equipped components is checked whether this temperature meet acceptance criteria or not. Also, this paper suggests temperature test range guidelines comparing temperature standards for general IC component. For the example in real field, this method uses the lowest temperature and the highest temperature in major domestic cities.

• Fire Science and Engineering
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• v.33 no.5
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• pp.66-77
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• 2019

To secure the safety and improve the work efficiency of forest firefighting crews, performance evaluation criteria for safety helmets were developed in this study. Because the standards for forest firefighting safety helmets are not available in Korea, we began our study based on the standards for firefighting safety helmets used by the Korea Fire Institute (KFI). Eleven test items were selected excluding 15 other items out of the 26 test items that, through the consultation of stakeholders and the review of foreign standards, were initially included in our study. Two types of general safety helmets and one firefighting helmet were tested by applying KFI standards, and the results were compared. The general safety helmets did not meet the standards of the retention system and chin strap. Additionally, polyethylene and acrylonitrile butadiene styrene materials were found to be especially weak under heat conditions. We compared the criteria of KFI, International Standardization Organization (ISO) 16073, National Fire Prevention Association (NFPA) 1977, NFPA 1971, and British Standards European Norm (BS EN) 443, and finally selected 11 test items and their acceptance criteria suitable for the work environment of forest firefighting crews in Korea.

• TTA Journal
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• s.92
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• pp.131-137
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• 2004

TTA(한국정보통신기술협회)는 2004년 2월 17일 엔텔테크놀로지㈜(http://www.ntel21.com/) VoIP Gateway(모델명: NT-301)의 기능 및 성능 시험을 수행하여 TTA Verified 인증서(번호: TTA-V-N-04-001)를 발급하였다. 또한 2004년 3월 10일 HS 텔리안㈜(http://www.hsteliann.com/) VoIP Gateway(모델명: Telimax414)의 시험을 수행하여 TTA Verified 인증서(번호: TTA-V-N-04-003)를 발급하였다. 위의 두 장비는 FXS 포트 및 PSTN 백업 포트 그리고 이더넷 포트가 장착된 장비로서, TTA가 위의 두 장비에 대하여 수행한 시험은 기능 확인 및 성능 평가를 측정하는 것이었다. 본 고에서는 TTA가 마련한 소용량 VoIP Gateway에 대한 인증기준(TTA-V-N-03-009-CC12)을 바탕으로 위의 두 장비에 대해 수행한 기능 및 성능 시험결과를 소개한다.

• Fire Science and Engineering
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• v.28 no.2
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• pp.48-53
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• 2014

In this study, we would evaluate fire risk by domestic standard for artificial turf installed on field and roofs. Today domestic regulation for artificial turf only applies to outdoor uses and especially KS M 3888-1 has compulsion but limited to school athletic facilities. Indoor regulation complying with National Emergency Management Agency (No. 2012-35) was enacted as recommendations. Thus this study did combustion test of artificial turf installed on field. Analyzed result by 45 degree flammability test, standard was inadequate to judge the fire risk so we compared and analysed its characteristic through combustion test of flame retardant finishing carpet used as flooring. Test and assessment result of its ignitionability by 45 degree flammability test showed that carpet was satisfied with flame retardant finishing performance standard contrary to artificial turf. For this reason, by conducting cone calorimeter test, the combustion property after ignition would be analyzed and evaluated and then this study will suggest a countermeasure for strengthening standard.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.11
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• pp.7244-7249
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• 2015

In this study, in order to asses the structural performance of trapezoidal PSC girder using a socket joint system and it is possible to calculate the optimized cross-section of the web element tests were carried out for each specimens. we conducted a socket joint performance test, web bending and shear performance tests and all tests were performed at 4 point loading method. The initial crack load of socket joint specimen was significantly lower than the reference specimen but post peak behavior was no significant differences. And the length of the loop joint of the reinforcing bars had no significant effect on the maximum load. As a web shear tests, to obtain a maximum load of the specimen has a prestressing rod reinforced at tension side. As a web flexural tests, to obtain higher diagonal cracking load in specimen of reinforced using prestressing rod than reference specimen.

• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.15-16
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• 2016

본 논문에서는 케이블 결함과 위치를 검출하기 위한 SSTDR(spread spectrum domain reflectomerty) 기반의 진단 장치를 개발하였다. 개발된 진단 장치는 sstdr 기법의 검출 성능을 향상시키기 위해 시간-주파수 상관 분석을 이용하여 기준신호(reference signal)의 상관계수 최댓값 위치를 검출 한 후 기준신호를 제거하여 반사신호의 상관계수의 최댓값 위치를 검출하는 2단계 과정을 갖는다. 개발된 케이블 결함 진단 장치는 실증 시험장을 구축하고, 성능시험을 실시한 결과, ${\pm}1%$ 내 외의 오차를 갖는 것으로 확인되었다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.04a
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• pp.214-218
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• 2011

대형 여객선(크루즈선)의 절반 이상을 차지하는 거주시설(accommodation), 즉 선실은 24시간 사람이 상주하는 구역임으로 화재로부터 안전하게 보호되어야 한다. 특히 선실의 발코니에서 화재발생 시 이를 통해 인근의 객실로 화재가 급격히 확대되므로 국제해사기구 (IMO)에서는 기준에 적합한 미분무수 소화설비를 설치할 것을 강제화하고 있다. 이러한 미분무 노즐은 IMO MSC/Circ. 1268에 따라 소화성능시험을 통해 형식승인을 득해야 하는데 본 연구에서 이러한 기준에 만족하는 미분무 노즐을 개발하고자 선실 발코니에 대한 화재시험을 수행하여 두 가지 노즐 형태에 대한 소화성능을 평가하였다.

• Journal of the Society of Disaster Information
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• v.17 no.3
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• pp.487-499
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• 2021

Purpose:The purpose of the paper is to review the problems of performance enhancement of safety certification standards and to suggest directions for improvement in order to rationalize safety certification standards for future industrial development and environmental changes. Method: The problems and limitations of the safety certification system are summarized through literature review and interview with manager, and the status of safety certification standards is classified into design standards, performance standards, and detailed standards, and the status analysis is performed. In addition, by synthesizing the results of the investigation and analysis, improvements are suggested to improve the performance of the safety certification standards. Result: Through the survey, the problems and limitations of safety certification could be grouped into six categories: government-led certification system operation, standardized certification standards, long time required to improve certification, poor certification standards preparation system, and lack of reflection of industry opinions. And, as a result of analyzing the certification standards by dividing them into performance and design standards, in the case of machinery, equipment, and protection devices, the design standards were high at 69.7% and 64.9%, whereas in the case of protective equipment, the performance standards were high at 61.1%. In order to improve the performance of safety certification standards centered on design standards, it is necessary to determine the possibility of performance enhancement of the certification standards and determine the feasibility of the inspection test method. In order to improve performance, it was reviewed that it was necessary to establish a systemic foundation and infrastructure, such as strengthening the Product Liability Act, systematizing market monitoring, etc., distributing certification test tasks, and participating in the preparation of certification standards by the private sector. Conclusion: Through this study, the problems and limitations of Korea's safety certification system were summarized and the necessity for performance improvement was reviewed. Performance improvement of safety certification standards is a matter that requires preparatory work, such as legislative revision and infrastructure construction, and requires mid-to-long-term promotion. In addition, rather than improving the overall safety certification standards, the performance requirements for each item subject to certification should be reviewed and promoted, and details should be specified through additional research.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.628-631
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• 2006

Modular Construction is a method, which factory-produced units are transferred to on-site and assembled to form complete buildings. It is expected that its demand will increase gradually. Because it has some advantages such as duration reduction, movement, reuse and environmental friendliness etc. For the Modular Construction to be introduced and applied, we needs the objective and reasonable performance criteria. This study presents the acoustic performance criteria of the modular building. For this one, this paper reviews legal standard related to performance, analyzes the performance evaluation and survey on pilot projects. The presented performance criteria can be specifically asked the demand by owner in a design guideline. In addition, it makes designer and general contractor accomplish target performance. Eventually, it can improve the performance of Modular Building.