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전동식 냉매 압축기의 베어링 내구성 확보를 위한 기구부 밸런스에 관한 연구
임종학(Jonghak Lim),도민훈(Minhun Do),이지원(Jiwon Lee),권성혁(Sunghyuk Kwon),강지훈(Jihoon Kang),정재령(Jaeryeong Jeong),이호성(Hoseong Lee),김명현(Meonghyun Kim) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
In this study, the results of the durability test of bearing according to the mass balance of the electric refrigerant compressor are confirmed. Currently, bearing damage is frequently occurring in electric refrigerant compressors. Ball bearings are vulnerable to tilting and axial loads. Therefore, it is important to set an appropriate balance. The rotating shaft of the electric refrigerant compressor adjusts the balance by changing the center of gravity of the four components. Two cases were tested for mass balance. The result was that the balance setting increased the lifespan from 800hr to more than 4000hr. The durability data of the improved electric refrigerant compressor requires further testing to the limit. After that, additional tests for mass balance in various stages are required.
이두진(Doojin Lee),이수민(Sumin Lee),김남균(Namgyun Kim),진종학(Jonghak Jin),김성규(Seongkyu Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
Redundant steering is a key technology for automated driving. The Electric Power Steering(EPS) system with fail-operational function enables either a driver or auto pilot system to make a safe stop in the rare case of a single failure. Mando developed a dual invertor system equipped with one actuator as the redundant steering system. In the case of single inverter, only 3 bus bars are needed. But the actuator needs 6 bus bars to connect the dual invertor. This means that when designing system, not only the distance from bus bar to magnetically sensitive Integrated Circuit (IC) but also the arrangement of bus bars are taken in account. In this paper, the optimized arrangement of 6 bus bars is proposed through static magnetic analysis to minimize the influence of the magnetic-sensitive IC Motor Position Sensor(MPS)bus. Frist define the design process, then analyze the magnetic field distribution based on the bus bar array combination table.
( Hyun Jeong Lee ),( Jonghak Lim ),( Junoh Peak ),( Mun-sang Ki ),( Sang-bong Lee ),( Gayong Choe ),( Jaeyun Jung ),( Hansang Jung ),( Suwon Jeon ),( Tae-sik Park ),( Soon-mi Shim ) 한국응용생명화학회(구 한국농화학회) 2020 Journal of Applied Biological Chemistry (J. Appl. Vol.63 No.2
The objective of this study was to investigate the effects of a hypodermic injectable solution comprised of an LPM LB meso solution containing Melissa officinalis L. leaf extract (LPM) on the lipogenesis in the 3T3-L1 cells line. The lipid accumulation measured by oil red o staining in the 3T3-L1 adipocytes treated with LPM, which was reduced in a dose dependent manner and showed 91.7 to 62.9% compared to control group. Its effectiveness with a 50% solution was significantly higher than the hydroxycitric acid (positive control) treatment without showing cell cytotoxicity. In a quantitative real-time PCR, it was demonstrated that the LPM treatment appeared to upregulate the mRNA expression of the adipogenesis-related genes, which included the peroxisome proliferator-activated receptor gamma (50% concentration) while down-regulating the CCAATenhancer binding protein alpha (50% concentration) and the sterol regulatory element-binding protein 1c (10, 25, and 50% concentrations). The results from the current study suggest that the LPM could be useful biomaterials that can inhibit obesity in the 3T3-L1 cells, which could possibly be by regulating the specific adipogenic gene transcription factors.