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김재형(Jay-Hyung Kim),한창운(Changwoon Han) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The air pressure inside an automatic transmission increases while an automobile is in operation. The pressure needs to be exhaled through an air breather to prevent critical damage to the transmission. A recommended design of the breather will release the air without leaking the transmission oil as the pressure opens and closes the air entrance. Therefore, determining the air pressure inside the transmission is mandatory for the breather design. This paper demonstrates the calculation to estimate the internal air pressure using the ideal gas law and suggests the design for the breather that can only adjust pressure without discharging the transmission fluid.
초기 류마티스 관절염에서 적혈구 침강속도, 혈청 C-반응성 단백과 방사선학적 진행의 상관관계
고재현 ( Jay Hyun Koh ),김재형 ( Jae Hyung Kim ),이창근 ( Chang Keun Lee ),전찬홍 ( Chan Hong Jeon ),서기현 ( Gi Hyeon Seo ),안홍준 ( Hong Joon Ahn ),차훈석 ( Hoon Suk Cha ),김진석 ( Jin Seok Kim ),안중모 ( Joong Mo Ahn ),고은미 ( 대한류마티스학회 1999 대한류마티스학회지 Vol.6 No.4
Objective: To investigate the clinical usefulness of serial measurement of erythrocyte sediment rate(ESR) and C-reactive protein(CRP) for monitoring the radiological progression in early rheumatoid arthritis(RA). Methods: Thirty one patients with RA according to the 1987 ACR criteria, with joint symptoms for less than one year, and who had not previously received disease modifying antirheumatic drugs(DMARDs) were assessed from Oct. 1994 to Aug. 1998 in retrospective study. Area under curve(AUC) of ESR and CRP were calculated in these patients. Joint damage in the hands was assessed by modified Sharp`s method. Results: Male to female ratio was 1: 3.4. Median age of this group was 45.8±13.2 years. Patients who had positive rheumatoid factor were 82%. Mean duration until first visit was 271.9±145.8 days. At the first clinic visit, mean ESR and CRP were 50mm/hr and 2.0mg/dL. Mean erosions and joint space narrowing score by modified Sharp`s method were 55.2 and 12.4, respectively. Correlation analysis showed that ESR AUC and CRP AUC were significantly associated with radiologic progression. Conclusions: Elevated over-time ESR and CRP provide a convenient short term correlation with radiologic outcome(i. e. erosions). Elevated over-time ESR and CRP can be used as a guide for therapy.