• International Journal of Highway Engineering
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• v.7 no.1 s.23
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• pp.63-71
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• 2005

Asphalt binder grading is to specify quality of asphalt binders relating to pavement performance in orderly manner, and provides the necessary information in selecting the appropriate asphalt binder for the hot mix design. For this purpose, United States has developed the PG-grading in 1995 and is implementing in practice. Recently, this American PG-grading system has been accepted as the domestic binder grading specification. However, the Asian (including Japan and China) and the most European countries are still use the traditional penetration and viscosity specification. The goal of this study lies in analysing the American PG-grading for its justification. As the result, the serious errors are found, and thus, to eliminate the errors, the more precise binder grading equation is introduced, Credibility of this study is checked by predicting the literature rut data with the equations mentioned. The prediction result are validating the claimes made in this study.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1787-1788
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• 2008

본 논문은 한국원전계측제어시스템(KNICS) 개발 사업의 일환으로 개발되는 안전등급 PLC(Programmable Logic Controller) 소프트웨어 개발 도구의 컴파일러에 대한 시험을 다룬다. 개발된 컴파일러에 대하여 외부 시스템과 연계하지 않고 내부에서 각 컴포넌트 별로 시험하는 컴포넌트 시험과 컴파일러 외부 시스템과 연계하여 시험하는 통합시험을 수행하였다. 시험 과정은 먼저 시험 계획 단계에서 시험 항목을 선정하고 각 항목 별로 사례와 시험 절차를 작성하며 이에 따라 시험을 수행한 결과를 분석하여 컴파일러의 수정 및 보완에 반영하는 것이다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2002.11a
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• pp.317-321
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• 2002

최근 Firewall, IDS와 같은 응용프로그램 수준의 보안 제품은 내부서버 자체의 취약성을 방어하지 못한다. 본 논문에서는 TCSEC C2급에 해당하는 보안성을 가지는 리눅스를 LKM(Loadable Kernel Module) 방법으로 B1급 수준의 다중등급 보안을 구현하였다, 따라서 구현된 다중등급 보안 리눅스 커널의 주요 기능을 기술하고, 시험 평가로서 강제적 접근제어, 성능 및 해킹 시험을 실시하였다. 구현된 보안 커널 기반의 리눅스 운영체제는 B1급의 요구사항을 만족하며, root의 권한 제한, DB를 이용한 실시간 감사추적, 해킹차단, 통합보안관리등의 추가적 기능을 제공한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.1
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• pp.185-191
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• 2015

This paper suggest the safety class communication board in order to design the safety network of the nuclear safety class controller. The reactor protection system use the digitized networks because from analog system to digital system. The communication board shall be provided to pass the required performance and test of the safety class in the digital network used in the nuclear safety class. Communication protocol is composed of physical layer(PHY), data link layer(MAC: Medium Access Control), the application layer in the OSI 7 layer only. The data link layer data package for the cyber security has changed. CRC32 were used for data quality and the using one way communication, not requests and not responses for receiving data, does not affect the nuclear safety system. It has been designed in accordance with requirements, design, verification and procedure for the approving the nuclear safety class. For hardware verification such as electromagnetic test, aging test, inspection, burn-in test, seismic test and environmental test in was performed. FPGA firmware to verify compliance with the life-cycle of IEEE 1074 was performed by the component testing and integration testing.

• Journal of Aerospace System Engineering
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• v.15 no.1
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• pp.95-101
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• 2021

The detection sensitivity of a Walk Through Metal Detector (WTMD) currently being developed and operated in Korea differs from one manufacturer to another, making it difficult for them to be used based on Aviation Security level. In addition, the FAA 3-GUN Test approved by the domestic aviation authority for aviation security supervision is a single test object. There is no Operational Test Piece (OTP) consisting of multiple test objects for the operation of aviation security for a WTMD. This paper, the detection sensitivity of a WTMD applied by a commercial OTP was measured and detection sensitivity standards for a WTMD were developed based on results of measurement. Furthermore, institutional plans to maintain the same detection sensitivity for domestic aviation security were made through suggestions for Korean standards OTP development methods, taking characteristics of the aviation field into consideration.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.6
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• pp.1031-1037
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• 2001

본 고에서는 요즘 전세계적으로 관심을 모으고 있는 정보통신 산업과 기술발전으로 인한 이동전화의 서비스 품질평가에 대한 방법을 정리하였다. 주요 내용으로는 이동전화 체감 통화품질 측정을 위한 시험조건 및 시험방법개선, 시험장비 기능 확인시험, 성능개선 요구 및 확인, 시험계획 수립 및 전국 측정 방법, 측정데이터 분석, 등급별 평가 등에 대한 내용으로, 특히 이동전화 품질평가 항목별 시험조건 및 시험방법, 이동전화 체감 품질 측정용 시험장비 성능/신뢰성 개선 그리고 전국 현장 측정 데이터분석 및 지역별 품질 산출, 등급별 평가 내용을 정리하였다. 또한 각 분야별 품질 평가 기술 방법에 패한 우리나라의 대응전략을 정리하여 산업체 기술개발에 많이 활용될 수 있을 것으로 사료된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.419-425
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• 2001

본 고에서는 요즘 전세계적으로 관심을 모으고 있는 정보통신 산업과 기술발전으로 인한 이동전화의 서비스 품질평가에 대한 방법을 정리하였다. 주요 내용으로는 이동전화 체감 통화품질 측정을 위한 시험 조건 및 시험방법개선, 시험장비 기능 확인시험, 성능개선 요구 및 확인, 시험계획 수립 및 전국 측정 방법, 측정데이터 분석, 등급별 평가 등에 대한 내용으로, 특히 이동전화 품질평가 항목별 시험조건 및 시험 방법, 이동전화 체감 품질 측정용 시험장비 성능/신뢰성 개선 그리고 전국 현장 측정 데이터분석 및 지역별 품질산출, 등급별 평가 내용을 정리하였다. 또한 각 분야별 품질 평가 기술 방법에 대한 우리나라의 대응전략을 정리하여 산업체 기술개발에 많이 활용될 수 있을 것으로 사료된다.

• Applied Chemistry for Engineering
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• v.35 no.3
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• pp.200-208
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• 2024

Chung's equations-IX and Chung's equation-XII were utilized to predict the fire risk and evaluate fire risk ratings for four types of wood: camphor, cherry, rubber, and elm trees. The combustion tests were conducted using a cone calorimeter test method by ISO 5660-1 standards. The fire risk and fire risk rating (FRR) were compared for Fire Risk Index-IX (FRI-IX) and Fire Risk Index-XII (FRI-XII). The results yielded Fire Performance Index-XI (FPI-XI) ranging from 0.08 to 11.48 and Fire Growth Index-XI (FGI-XI) ranging from 0.67 to 111.89. The Fire Risk Index-XII (FRI-XII), indicating fire risk rating, exhibited an increasing order of cherry (0.45): Grade A (Ranking 5) < PMMA (1): Grade A (Ranking 4) < elm (1.23): Grade A (Ranking 3) < rubber (1.56): Grade A (Ranking 2) << camphor (148.23): Grade G (Ranking 1). Additionally, the fire risk index-IX (FRI-IX) was cherry (0): Grade A (Ranking 3) ≈ rubber (0): Grade A (Ranking 3) ≈ elm tree (0): Grade A (Ranking 3) < PMMA (1): Grade A (Ranking 2) << camphor tree (66.67): Grade G (Ranking 1). In general, camphor was found to have the highest fire risk. In conclusion, although the expression of the index is different as shown based on the standards of FRI-IX and FRI-XII, predictions based on fire risk assessment of combustible materials showed similar trends.

• Proceedings of the KIEE Conference
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• 2001.04a
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• pp.63-66
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• 2001

원자력발전소는 지진과 같은 자연재해나 극한 운전조건에서 방사능물질이 외부로 누출되는 것을 방지하도록 설계 되어야한다. 따라서 이와 관련된 안전등급기기는 원전설비의 정상운전조건뿐 아니라 원전설계기준 사고조건(DBE, Design Basis Events)에서도 그 안전성 관련 기능이 검증되어야 한다. 본 연구에서는 국내 원자력 발전소의 다양한 환경조건을 만족하며 엄격한 기기검증요건에 따라 당사가 수행한 안전등급(Class 1E) 저압 유도전동기의 개발사례를 중심으로 방사능노출시험, 가속열노화해석 및 시험, 내진해석 및 시험으로 구성되는 기기검증의 절차와 방법을 제시하였다.

• Journal of Animal Science and Technology
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• v.49 no.6
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• pp.783-800
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• 2007

The current study was conducted to investigate the effect of high quality hay on the performance and carcass characteristics of Hanwoo steers. Twenty(20) Hanwoo(7 months old) were allocated into either Control(rice straw fed) or Treatment(timothy hay and rice straw fed) group(10 animals per group) and fed for 710 days until the animals reached at 30 months old. Concentrates were fed according to the feeding program composed with three(3) phases; growing, fattening, and finishing period. For the overall feeding period, final body weights were 761.3 and 799.6kg for the Control and Treatment groups, respectively, showing 38.3kg heavier body weight in Treatment group. ADG were 0.79 and 0.84kg for Control Treatment groups, respectively. These results might be because of the intake of high quality hay during growing phase and the effects persisted until the end of the experiment. Feed intake tended to be higher in Treatment group whereas feed conversion did not show significant difference between groups. Cold carcass weights were 451.0 and 475.3kg for Control and Treatment, There were no significant difference between groups in both yield and quality grade. There were no remarkable differences in physico-chemical characteristics fatty acid composition of carcasses between groups. In conclusion, it would be beneficial to feed high quality hay such as timothy during growing period of Hanwoo steers to produce high quality beef with heavier live and carcass weight.