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스티어링 시스템 모델 단순화를 통한 진동 특성 인자 분석
정승갑(JEUNG. SEUNG KAB),서진관(SUH. JIN KAWN) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
In this paper, mathematically simplified steering system models(Ⅰ, Ⅱ, Ⅲ) are derived and proved. Model I shows the relationship between steering system support stiffness and steering system(column, wheel & shaft etc.) stiffness and model Ⅱ, Ⅲ are introduced to know vibration characteristic factor effect in the steering support stiffness.<br/> <br/>
구휘모,정승일,권동덕,김명하,정재흥,한미아,이승환,정인갑,김선일,황의창 대한비뇨기종양학회 2024 대한비뇨기종양학회지 Vol.22 No.1
Purpose: The aim of this study was to assess the effects of tyrosine kinase inhibitors (TKIs) following metastasectomy in patients with metastatic renal cell carcinoma (mRCC). Materials and Methods: A systematic search of multiple electronic databases was conducted. The inclusion criteria encompassed randomized clinical trials evaluating the use of TKIs after metastasectomy in mRCC patients. Study outcomes were relapse-free survival (RFS)/disease-free survival (DFS), overall survival (OS), and adverse events of TKIs. Results: Two studies with 197 randomized participants that compared TKIs following metastasectomy versus metastasectomy alone were identified. According to these studies, TKIs following metastasectomy may result in little to no difference in RFS/DFS (hazard ratio [HR], 1.01; 95% confidence interval [CI], 0.65–1.57; I 2 =29%; low-certainty evidence). TKIs after metastasectomy may slightly increase OS, but the CI crossed the line of no effect (HR, 0.80; 95% CI, 0.06–9.87; I2 =86%; low-certainty evidence). TKIs after metastasectomy likely resulted in a large increase in adverse events (risk ratio, 2.76; 95% CI: 1.65–4.62; I2 =not applicable; moderatecertainty evidence). Conclusions: TKIs following metastasectomy did not improve RFS/DFS, but slightly improved OS. It is likely that TKIs following metastasectomy increase adverse events compared to surgery only. The certainty of evidence ranged from moderate (signaling confidence that the reported effect size is likely close to the true effect) to low (indicating that the true effect may be substantially different from the effect estimate). The findings of this study should help to inform future guidelines and clinical decision-making at the point of care.
5절점 상당요소에 의한 굽힘문제의 정적해석 및 자유진동해석
권영두,윤태혁,정승갑,박현철,Gwon, Young-Doo,Yun, Tae-Hyeok,Jeong, Seung-Kap,Park, Hyeon-Chul 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.4
In the present study, we consider modified 5-node equivalent solid element which has smallest degree of freedom among 2-dimensional solid elements accounting bending deformation as well as extensional and shear deformations, We shall investigate static and dynamic characteristics of this element, which is very effective in thin beam, thick beam, large displacement problems, beam of variable thickness, and asymmetrically stepped beam, etc., as well as relatively simple problems of beam. The degree of freedom of this element is 10, which is smaller than 18 of 9-node element, 16 of 8-node elemtns, 12 of modified 6-node element and Q6 element. Therefore, this element is expected to broaden the effective range of application of the solid elements in the bending problems further.