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Steady-state Vibration Analysis of Modal Beam Model under Parametric Excitation
이성현,정의봉 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
This research suggests the efficient numerical scheme to analyze the time-response of steady-state vibration of modal beam model when the properties (stiffness, damping) of the model are time-varying. The piping system conveying harmonically pulsating fluid is a typical example of parametrically excited system because the properties such as stiffness and damping are time-dependent characteristics. To analyze the time-response of this system, numerical integration method of differential equations, such as the Runge-Kutta method was usually used. But this method requires extensive computational efforts to solve the time-response of time-varying systems. In this paper, the governing equation was transformed to a single degreeof-freedom model at a certain mode by using assumed-mode method. A new method to predict efficiently the steady-state response for a time-varying system was presented. The steady-state response was assumed to have the frequency of the pulsation and its multiples, and was predicted by comparing the coefficients of Taylor series expansion. The efficiency of this method was validated by the comparison with conventional numerical method of differential equations and experimental results.
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Acute ankle lateral ligament injury: an up-to-date review
이성현,Min Seok Kim 대한정형외과 스포츠의학회 2023 Arthroscopy and Orthopedic Sports Medicine Vol.10 No.1
Ankle lateral ligament injuries are common in everyday life and sports. Because most lateral ankle ligament injuries oc-cur during sports, proper diagnosis, treatment, and rehabilitation are critical to the patient’s prognosis. A physical exami-nation is necessary for determining ankle injuries. Radiographic examinations include radiography, ultrasonography, and magnetic resonance imaging (MRI), and there are differing views on these tools. The goal of treatment for acute ankle lateral ligament injuries is to prevent chronic ankle instability. Exercise and bracing are more evidenced-based rec-ommendations that should be incorporated into the rehabilitation process. A comprehensive and progressive exercise program should include range of motion, stretching, strengthening, neuromuscular, proprioceptive, and sport-specific exercises. Many systematic reviews have found insufficient evidence to support the clinical usefulness and necessity of primary surgical repair for acute lateral ankle sprains. Surgical treatment for acute lateral ankle sprain without concomi-tant pathologies is not recommended and should only be considered in cases of severe injury with large bony avulsion or frank dislocation or professional athletes with complete ligament rupture (Grade III) and severe instability.
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庾信의 대필편지 ― 「爲梁上黃侯世子與婦書」에 나타난 六朝駢文의 예술적 특징
이성현 중국어문학연구회 2018 중국어문학논집 Vol.0 No.113
This thesis is a study of historical evolvement and aesthetic feelings of parallel prose in Six Dynasties. The features in the Yu Xin’s letter in particular, lingering charm(音韻)ㆍliterary quotation(典故)ㆍantithetical parallelism(對偶), has important values. Yu Xin’s letter has been read as an erotic work, but I will do some reinterpretation on this letter. In conclusion, Yu Xin’s letter expresses the longing for his hometown, this has not yet been addressed, it is necessary to continue research on this subject.
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