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KSAE 자작 전기자동차 트랙션 모터의 냉각 성능 개선에 관한 연구
김영찬(Young Chan KIM),이인재(In Jae LEE),박정빈(Jung Bin PARK),장유정(Yu Jeong JANG),우솔휘(Sol Hwi WOO),이슬이(Seul-li LEE),백수황(Soo-Whang BAEK),이상욱(Sang Wook LEE) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
In this study, traction motor cooling duct for KSAE jajak EV was developed and the performance was validated by real vehicle driving tests. Traction motor cooling duct was designed by using general purpose commercial CAD program SolidWorks and prototype was manufactured via 3D Printing. Flow simulations were conducted to predict cooling performance of cooling duct and it showed that the cooling duct can guide ram air to traction motor located in the backside of the jajak EV which can be helpful for the traction motor cooling. Coastdown test was performed to find the aerodynamic drag increase due to the cooling duct and it was confirmed that the drag increase can be negligible. Finally, cooling test was performed and the real results showed that the cooling duct can decrease the traction motor temperature by approximately 7 to 11 degrees during highloading driving condition with negligible increase of road-load.
전북지역 송아지 설사 유래 병원성 대장균의 병원성 인자 및 다제 내성 패턴
곽길한 ( Kil-han Kwak ),김선민 ( Seon-min Kim ),유영주 ( Yeong-ju Yu ),유정희 ( Jeong-hee Yu ),임미나 ( Mi-na Lim ),장유정 ( Yu-jeong Jang ),허진 ( Jin Hur ) 한국동물위생학회 2021 韓國家畜衛生學會誌 Vol.44 No.4
Pathogenic Escherichia coli (E. coli) is one among the most important agents of diarrhea in calves. From January to December 2021, 108 isolates from feces of calves with diarrhea were investigated for enterotoxigenic E. coli (ETEC), enteropathogenic E. coli (EPEC), shiga toxin-producing E. coli (STEC), enteroaggregative E. coli (EAEC), and enteroinvasive E. coli (EIEC) using real-time PCR. In addition, the genes for F5, F17 and F41 fimbriae were detected by PCR. The most frequently isolated pathotypes were EPEC/STEC (29 isolates), and ETEC/EPEC/STEC (29 isolates). ETEC/EPEC, and ETEC/STEC were also found in 10 isolates. EPEC, STEC, and ETEC were detected in 13, 11, and 6 respectively. EAEC, and EIEC was not detected. Antimicrobial resistance test was carried out by agar disc diffusion method with 14 antimicrobials. Among 108 pathogenic E. coli isolates, 107 isolates were resistant to at least one of 14 antibiotics used in this study, 99 (91.7%) were resistant to two or more antimicrobials, and a single remarkable isolate was resistant to 14 antimicrobials. The isolates were primarily resistant to penicillins, streptomycin, tetracycline, ceftiofur, Trimethoprim/sulfamethoxazole, Kanamycin, and Ciprofloxacin. The high rate of resistance in pathogenic E. coli, sometimes to multiple drugs, may complicate future options for treating human infections. These results may bu used for diagnosis and therpeitic purposes in calves with diarrhea.