• 한국화재소방학회논문지
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• 제31권4호
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• pp.1-6
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• 2017

국내 건축물에 사용되는 내화도료는 품질시험을 통하여 내화구조로 인정받아야 사용할 수 있다. 품질시험은 내화시험 및 부가시험이며 내화도료의 부가시험 항목은 가스유해성과 부착강도이다. 이중 가스유해성의 경우 관련 KS 등에 따라 동물실험을 하며 매건 16마리의 살아있는 쥐가 희생된다. 이에 실험자는 윤리적 부담을 느끼게 되며 실험기관은 관련 법률에 따른 실험동물운영위원회 운영 등 행정적 부담을 지게 된다. 이에 연소 가스의 성분 분석을 통한 유해성 측정 등 상기 동물실험을 대체하려는 연구와 노력이 지속되고 있으나 현재까지는 동물실험이 유지되고 있다. 연소가스의 유해성 평가 시 시험체 가열에 따라 발생하는 배기온도가 측정되는데 특정 타입 내화도료에 대한 배기온도를 분석하여 유의한 초기 반응 양상을 파악할 수 있다면 동물실험 대체에 기여할 수 있을 것이라 사료된다. 이에 본 논문을 통하여 가스유해성 시험 시 쥐의 행동정지시간과 배기온도와의 관계를 파악하여 현 동물실험의 개선점을 찾아보고자 하였다.

• Animal Bioscience
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• 제35권1호
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• pp.147-152
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• 2022

Objective: This study was conducted to obtain an objective index that can be quantified and used for establishing an animal welfare certification standard in Korea. For this purpose rumen pH, ruminating time, milk yield, milk quality, and blood components of cows reared in farms feeding high forage level (90%) and farms feeding low forage level (40%) were compared. Methods: Data on rumen pH, rumination time, milk yield, milk fat ratio, milk protein ratio, and blood metabolism were collected from 12 heads from a welfare farm (forage rate 88.5%) and 13 heads from a conventional farm (forage rate 34.5%) for three days in October 2019. Results: The rumination time was longer in cattle on the welfare farm than on the conventional farm (p<0.01), but ruminal pH fluctuation was greater in the cattle on conventional farm than the welfare farm (p<0.01). Conventional farms with a high ratio of concentrated feed were higher in average daily milk yield than welfare farms, but milk fat and milk production efficiency (milk fat and milk protein corrected milk/total digestible nutrients) was higher in cattle on welfare farms. Blood test results showed a normal range for both farm types, but concentrations of total cholesterol and non-esterified fatty acid were significantly higher in cows from conventional farms with a high milk yield (p<0.01). Conclusion: The results of this study confirmed that cows on the animal welfare farm with a high percentage of grass feed had higher milk production efficiency with healthier rumen pH and blood metabolism parameters compared to those on the conventional farm.

• 대한임상검사과학회지
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• 제41권3호
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• pp.123-127
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• 2009

After a health examination, abnormal patients were classified into two groups. One needs clinical treatment immediately, while the other one needs check-up in 2~3 month after for blood tests and preventive medical study. To discover the status and importance of the follow-up study in a health program, blood test upon health examination was compared to the test from the follow-up. We examined patients of ages from 20's to 70's. Among these patients, most of them were between 40's and 50's, and in male patients the follow-up test were more freguent than female. We examined blood obtained from January 2007 to December 2008. We analyzed and compared initial and the follow up blood test. Lipid profile, liver test, thyroid function tests (TFTs), glucose fasting, and HbA1c were examined from the blood tests. We also surveyed their distribution and status. The value of the follow up blood tests was significantly decreased with the most striking differences in lipid profiles and liver test. Follow up study is able to improve life style of patients through doctor's advice in a health program. Therefore, we can conclude that the follow up blood test is also quite critical.

• 한국항행학회논문지
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• 제22권6호
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• pp.530-536
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• 2018

최근 무인항공기 드론의 활용범위와 수요가 지속적으로 증가함에 따라 무인항공기와 유인항공기 간 공역을 통합하여 운용하는 연구가 전 세계적으로 활발하게 진행되고 있다. 공역 통합을 위해서는 유인항공기에 준한 기술기준 및 인증 제도 수립이 필수적이며, 이에 따른 시험평가 방안이 제시되어야 한다. 본 논문에서는 향후 무인항공기 항법 시스템에 대한 기술기준이 수립되었을 경우, 기술기준 적합성 검증을 위한 시험방법을 제시하였다. 연구를 위해 무인항공기 임무 프로파일 및 운용환경 분석, 시험항목 도출, 시험방법 수립, 시뮬레이션 및 무인항공기를 통한 실증을 수행하였다. 시험방법으로 정적시험, 트랙이동시험, 경로비행시험이 도출되었으며, 각 시험수행 결과 시험대상 무인항공기의 항법시스템 오차는 전체 비행단계에서 95% 신뢰수준에서 약 1.4m의 위치정확도를 보임을 확인하였다.

• 한국분무공학회지
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• 제21권4호
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• pp.200-206
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• 2016

Recently, the certification procedure for exhaust emission regulation of LDV has tested with the NEDC mode in the laboratory. But the on-road exhaust emissions exceed the standard emission limits. Therefore, it is important to analyze the real-driving emissions (RDE) with a portable emissions measurement system (PEMS). In present study, the on-road emissions were measured with a PEMS and evaluated by moving averaging window (MAW) method. Also, it was compared with the $CO_2$ and $NO_x$ emissions for real-driving and test modes from euro-6 light-duty vehicles equipped with SCR and LNT systems. In results, on-road $NO_x$ emission has been 2.3-10.0 times higher than the standard $NO_x$ emission limit on NEDC mode. The reason was that the test modes did not reflect traffic and various real-driving patterns sufficiently.

• 한국분무공학회지
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• 제21권4호
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• pp.207-213
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• 2016

To protect air pollution of urban area from motor vehicles, emission limits for diesel vehicles have been dramatically lowered in short period. But recent studies have shown that on-road NOx emissions of light-duty diesel vehicles are considerably higher than the values measured with laboratory test procedures used for emission certification. To tackle with this issue, Ministry of Environment have a plan to introduce EU RDE-LDV (Real-driving Emission-Light-duty Vehicle) regulation. In this study, 4 Euro 6 diesel vehicles have been tested with the new test procedures published by EU to estimate on-road NOx emissions using PEMS (Portable Emission Measurement System). The results have shown that the requirements of EU RDE-LDV could be met in driving condition of metropolitan area for constitution of test routes and validity of test results. In analysing with Moving Averaging Window method the completeness and normality of test data were validated with the requirement. On-road NOx emissions were quite deviated as test vehicles and higher than the new limit of on-road NOx emission enforced from Sept. 2017, which means that RDE-LDV can effectively reduce NOx emission of diesel vehicles in real driving conditions of Korea.

• 신재생에너지
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• 제16권1호
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• pp.15-24
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• 2020

For mechanical load testing of wind turbines, capture matrix is constructed for various range of wind speeds according to the international standard IEC 61400-13. The conventional method wastes considerable amount of data by its invalid data policy -segment data into 10 minutes then remove invalid ones. Previously, we have suggested an alternative way to save the total amount of data to build a capture matrix, but the efficient selection of data has been still under question. The paper introduces optimization algorithms to construct capture matrix with less data. Heuristic algorithm (simple stacking and lowest frequency first), population method (particle swarm optimization) and Q-Learning accompanied with epsilon-greedy exploration are compared. All algorithms show better performance than the conventional way, where the distribution of enhancement was quite diverse. Among the algorithms, the best performance was achieved by heuristic method (lowest frequency first), and similarly by particle swarm optimization: Approximately 28% of data reduction in average and more than 40% in maximum. On the other hand, unexpectedly, the worst performance was achieved by Q-Learning, which was a promising candidate at the beginning. This study is helpful for not only wind turbine evaluation particularly the viewpoint of cost, but also understanding nature of wind speed data.

• 한국항행학회논문지
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• 제20권1호
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• pp.1-7
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• 2016

국토교통부는 2014년부터 한국형 위성보강항법시스템 (SBAS; satellite based augmentation system)인 KASS (Korea augmentation satellite system) 개발 구축 사업을 진행 중이다. KASS는 실제 운영 중 문제가 발생할 경우 인명 및 재산피해와 연결될 수 있어 시스템 개발을 위한 안전성 평가가 매우 중요하다. 안전성 평가의 핵심은 위해 식별과 심각도 판정에 따른 개발보증레벨 (DAL; design assurance level) 할당이다. 본 연구에서는 항공시스템의 안전성 평가 방법론을 제시하는 국제표준인 SAE (society of automotive engineers) ARP4761 (aerospace recommended practice)을 기반으로 KASS 및 그 하위시스템에 대해 개발보증레벨 할당을 수행한다. 이것은 전체 시스템 안전성 평가의 첫 단계이므로 향후 KASS 개발 구축 사업의 안전성 평가에 활용될 수 있다.

• 전기학회논문지P
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• 제67권2호
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• pp.75-81
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• 2018

In this paper for developing and implementing the car driver's front lane attention enhancement developed system using the car camera. The developed system automatically alarm the car driver when front cars make the dangerous situation. We use Raspberry Pi camera module V2 as car camera module, Raspberry Pi 3 board as hardware main board of implementing embedded system and develop the application library module which can be operated on the Raspberry situation. The application library module widely consist of two part, front car recognition part and dangerous situation distinguish part. Our developed system satisfy the performance test of the target system at the software test certification laboratory of TTA(Telecommunication Technology Association). We test four items as attentive car recognition ability at day and night, system performance, response time. We get the performance of developed system based on the four goal. The car driver's front lane attention enhancement system in this paper will be widely used at the ADAS(Advanced Driving Assistance System) because of the better performance and function.

• Journal of Korean Society for Atmospheric Environment
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• 제24권E1호
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• pp.24-31
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• 2008

In this study, a new PM (particulate matter) sampler was developed and fabricated to collect fine particles in the atmosphere, and laboratory and field tests were carried out to evaluate the performance of the sampler. The PM sampler, which was based on impingers, employed an aerosol condensation system as a PM magnifier to improve its collection efficiencies. Sodium chloride, ammonium sulfate and ammonium nitrate aerosols were used as test particles, because these components are rich in ambient aerosols. As a result, it was found that the collection efficiency of the novel PM sampler was very high. Thus, it is believed that the PM sampler is an effective device for sampling fine particles. In addition, it was demonstrated that this work could contribute to the collection or removal of fine particles and be applied to the semicontinuous sampling of ambient aerosols for chemical composition analysis.