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IDI 압축 착화기관에서 동물성 유지를 이용한 바이오 디젤의 연소 특성 연구
김재한(Jaehan Kim),김진홍(Jinhong Kim),김기석(Kiseok Kim),오영택(Youngtaig Oh) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Due to environmental pollution and depletion of fossil fuels, research of eco-friendly energy source that can replace the fossil fuels being actively performed. Although biodiesel by vegetable oil has been produced, the interest in the animal fats is increasing due to the food shortages and rise of grain price. In this study, we have performed for exhaust emission and combustion characteristics of indirect injection (IDI) compression ignition engine by using lard biodiesel 5-30% mixture of diesel at various engine speeds and operational conditions. We have obtained that the results of engine performance operated by lard biodiesel at various engine load and speed was slightly decreased, but brake specific energy consumption (BSEC) at using lard biodiesel below 15% was better than diesel fuels. When the mixing ratio of biodiesel increased, PM was a significantly reduced. However, NOx was a slight increase. Therefore, that the biodiesel of animal fats is available for alternative fuel of diesel engine was confirmed.
JaeHan Joo,Jae-Gwang Lee,SangWoo Kim,JaeHan Lee,June-Hee Lee,Kyung-Jae Lee 대한직업환경의학회 2020 대한직업환경의학회지 Vol.32 No.-
Background: We aimed to find the relationship between sleep duration and impaired fasting glucose according to working type in non-regular workers using the 2016 and 2017 Korean National Health And Nutrition Examination (KNHANE, 7th revision). Method: In the 1st and 2nd year (2016, 2017) of the 7th KNHANE, 16,277 people participated. Minors were excluded because this study was intended for individuals aged 19 years and older. As this study was based on wage workers, unemployment, self-employed workers, employers, unpaid family workers, and those who have insufficient answers such as unknown or no response were excluded. Regular workers were excluded because this study was intended for non-regular workers. Finally, a total of 2,168 people were included in the survey, except those who had been diagnosed with diabetes, had a fasting blood glucose level of 126 mg/dL or higher, or taking hypoglycemic agents or receiving insulin injections. To find the relationship between sleep duration and impaired fasting glucose according to work type in non-regular workers, multiple logistic regression analysis was performed by adjusting the general and occupational characteristics after stratification according to work type. All statistical analyses were performed using the SPSS software (version 26.0; SPSS Inc., Chicago, IL, USA). Results: In the case of insufficient sleep duration in irregular female workers, the odds ratio (OR) of impaired fasting glucose was statistically insignificant, but in the case of insufficient sleep duration in irregular male workers who have shift work, the odds ratio (OR) of impaired fasting glucose was significantly higher than that of sufficient sleep duration (Model 1, OR: 3.05, 95% confidence interval [CI]: 1.18–7.90; Model 2, OR: 2.81, 95% CI: 1.08–7.29). Conclusions: Our findings demonstrate that insufficient sleep duration was associated with an increase in fasting blood glucose levels in non-regular male workers working shifts. This means that non-regular workers are in desperate need for adequate sleep and health care. We hope that our study will help improve the health of non-regular workers and more systematic and prospective follow-up studies will be conducted to further improve the health of non-regular workers.
Link budget and Functional analysis of Digital simulcasting system via satellite
Kim, Jaehan 호남대학교 2001 호남대학교 학술논문집 Vol.22 No.2
본 논문에서는 디지털 위성 동시방송용 전송 시스템의 링크 해석을 수행하고 시스템을 기능적으로 분석하여, HDTV와 SDTV의 동시방송 및 데이터 방송에 적합하고 충분한 신호 레벨과 마진을 갖고 있는지를 파악하였다. 아울러 각 서브 시스템의 동작과 기능을 구조적으로 분석하여 멀티미디어 데이터의 효율적 전송 및 인터페이스의 적합성과 효율성에 대하여 연구하였다.
Kim, Choonsoo,Kim, Seonghwan,Hong, Sung Pil,Lee, Jaehan,Yoon, Jeyong The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.21
<P>Recently, two types of TiO2 nanotube arrays (NTAs) (blue- and black-colored TiO2 NTAs), which are easily fabricated by electrochemical self-doping, have gained much attention due particularly to their enhanced capacitive and oxidant-generating properties. These enhanced electrochemical properties mean that they have potential as basic materials for energy and environmental applications, such as in supercapacitors and anodes for water treatment. However, the understanding of the effect of the doping level of these TiO2 NTAs on their electrochemical properties is limited because there is no direct comparison or relevant discussion of their respective electrochemical properties under the same conditions, despite the similar surface characteristics of the TiO2 NTAs obtained by comparable electrochemical doping. Therefore, the objective of this study was to investigate the effect of the doping level of blue and black TiO2 NTAs on their electrochemical properties, including the capacitive and oxidant-generating properties. Although no significant difference in their surface properties was found using SEM, XRD and XPS, the black TiO2 NTA revealed a slightly higher doping level than the blue TiO2 NTA, which is caused by the order of the electrochemical self-doping and annealing conditions. With the different doping levels of the two TiO2 NTAs, the black TiO2 NTA showed a higher areal capacitance, indicating good capacitive properties, and better service life in oxidant-generation than that of the blue TiO2 NTA. The blue TiO2 NTA exhibited a larger oxygen evolution overpotential and higher chlorine evolution efficiency than that of the black TiO2 NTA. We report that the new knowledge on blue and black TiO2 NTAs from this study can contribute to the further development of supercapacitors and oxidant-generating anodes for water treatment.</P>