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비선형 와류격자법을 이용한 작은 종횡비 날개의 고받음각 및 지면효과 후류 특성 분석
이세욱,Lee, Seawook 한국교통대학교 융복합기술연구소 2014 융ㆍ복합기술연구소 논문집 Vol.4 No.1
For the analysis of lifting surface at high angle of attack, a Nonlinear Vortex Lattice Method(NLVLM) was used. The NLVLM is intented to compute the interactions between lifting surfaces and separated vertical flow. The lifting surfaces are represented by a lattice of discrete vortex rings. And wakes are represented by families of non-lintersecting, semi-infinite vortex line segments. The image method also used to analyze the ground effect. It is found that vortex lines separated from lifting surfaces represent the separated flows successfully. Although the present method is applied for the rectangular wing and delta wing, extensions can be possible for the arbitrary lifting surfaces. The Present results show good agreement with experimental data.
응급실에 내원한 환자 중 누구에게 파상풍 항체 간이 검사를 시행할 것인가?
이세욱,신종환,송경준,김한범,홍기정 대한응급의학회 2012 대한응급의학회지 Vol.23 No.4
Purpose: Tetanus vaccine or immunoglobulin is given routinely to patients with wounds according to immunization history. Our aim is to identify prediction factors that affect tetanus antibody titer, which lead to proper application of an antibody screening test according to the factors. Methods: Subjects who visited the emergency department after injury from October 2008 to February 2010 were enrolled. The Tetanus Immunoglobulin G ELISA (Enzymelinked immunosorbent assay) method was used for analysis of serum samples. Using multivariate analysis, we identified statistically significant variables affecting the tetanus antibody titer. And we developed the Boramae Tetanus Score as a screening model. Results: A total of 1218 samples were analyzed. Significant factors affecting tetanus antibody titer were as follows: Age in the twenties, thirties, and fifties, male sex, and experience of military service. We assigned proper scores to each variable using the beta-coefficients. The area under the Receiver Operating Characteristic (ROC) curve of the scoring system was 0.807. Patients were categorized as high risk and low risk groups; 18.0% of the high risk group and 67.7% of the low risk group had serum tetanus antibody titer higher than safe antibody level (0.1 IU/mL). Conclusion: The antibody titer of the high risk group was low enough for performance of routine immunization. “In order to prevent unnecessary immunization, patients in the low risk group should undergo screening using proper tools”