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전동식 조향시스템의 EMS 검증시험에 관한 각도-인덱스 방식의 실시간 분석 알고리즘 연구
오세룡(SeRyong Oh),최대근(DaeGeun Choi),임태서(TaeSeo Lim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Power steering system assists the driver of an automobile in steering by directing a portion of the vehicle’s power to traverse the axis of one or more of the roadwheels. There are two types of power steering systems-hydraulic and electric.(A hydraulic-electric hybrid system is also possible) A hydraulic power steering (HPS) uses hydraulic pressure supplied by an engine-driven pump to assist the motion of turning the steering wheel. Electric power steering (EPS) is more efficient than the hydraulic power steering, since the electric power steering motor only needs to provide assistance when the steering wheel is turned, whereas the hydraulic pump must run constantly. But as EPS has high power circuit to generate high torque of the motor, it has Electro-Magnetic Susceptibility(EMS) weakness characteristic. Therefore EMS characteristic of EPS system is critical point. Generally, EMS validation test is performed manually using test JIG and the result is assessed by quick-look analysis method. In the paper, new criteria(real-time analysis algorithm) and validation auto-test model about EMS validation test is suggested. Using the Degree-Index method and test JIG, the EMS validation test is performed automatically and the result is assessed by real-time analysis algorithm.
오정석(Jeongseog Oh),노동순(Dongsoon Noh),이대근(Daegeun Lee),양제복(Jebok Yang),고창복(Changbok Ko) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
The non-premixed Oxy-CH₄ flame characteristics were studied in a lab-scale slot burner for industrial furnace design. To estimate the flame stabilization, flow velocity was varied upto uF=50 ㎧ for methane gas and uOx= 100 ㎧ for oxygen gas. The flame stabilization curve showed that lifted flame region became broaden with oxygen inlet temperature (TOx) increase and slot separation width decrease. In addition, the carbon-dioxide (CO₂) dilution to oxidant debilitated the flame stabilization due to reduced oxidant concentration and chemical reaction.
Clinical Characteristics of Post-COVID-19 Persistent Cough in the Omicron Era
Kang Yu Ri,Huh Jin-Young,Oh Ji-Yoon,Lee Ji-Hyang,Lee Daegeun,Kwon Hyouk-Soo,Kim Tae-Bum,Choi Jae Chol,Cho You Sook,Chung Kian Fan,Park So-Young,Song Woo-Jung 대한천식알레르기학회 2023 Allergy, Asthma & Immunology Research Vol.15 No.3
Cough is one of the most common symptoms of acute coronavirus disease 2019, but cough may persist for weeks or months. This study aimed to examine the clinical characteristics of patients with post-coronavirus disease (COVID) persistent cough in the Omicron era. We conducted a pooled analysis comparing 3 different groups: 1) a prospective cohort of post-COVID cough (> 3 weeks; n = 55), 2) a retrospective cohort of post-COVID cough (> 3 weeks; n = 66), and 3) a prospective cohort of non-COVID chronic cough (CC) (> 8 weeks; n = 100). Cough and health status was assessed using patient-reported outcomes (PROs). Outcomes, including PROs and systemic symptoms, were longitudinally evaluated in the prospective post-COVID cough registry participants receiving usual care. A total of 121 patients with post-COVID cough and 100 with non-COVID CC were studied. Baseline cough-specific PRO scores did not significantly differ between post-COVID cough and non-COVID CC groups. There were no significant differences in chest imaging abnormality or lung function between groups. However, the proportions of patients with fractional exhaled nitric oxide (FeNO) ≥ 25 ppb were 44.7% in those with post-COVID cough and 22.7% in those with non-COVID CC, which were significantly different. In longitudinal assessment of the post-COVID registry (n = 43), cough-specific PROs, such as cough severity or Leicester Cough Questionnaire (LCQ) scores, significantly improved between visits 1 and 2 (visit interval: median 35 [interquartile range, IQR: 23–58] days). In the LCQ score, 83.3% of the patients showed improvement (change ≥ +1.3), but 7.1% had worsened (≤ −1.3). The number of systemic symptoms was median 4 (IQR: 2–7) at visit 1 but decreased to median 2 (IQR: 0–4) at visit 2. In summary, post-COVID persistent cough was similar in overall clinical characteristics to CC. Current cough guideline-based approaches may be effective in most patients with post-COVID cough. Measurement of FeNO levels may also be useful for cough management.