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유동욱,전재천,김예림,박의준,김근태 계명대학교 의과대학 2021 계명의대학술지 Vol.40 No.2
A high body temperature, i.e. fever, is a crucial vital sign, and suggests the patient’s infection or inflammation. COVID-19 has changed the lifestyle, and led to the changes in medical use behavior of febrile patients. We investigated the change in etiologies of fever in the emergency department (ED) before and after COVID-19. The medical records of patients with fever who visited the ED of a university hospital before and after the outbreak of COVID-19 in Daegu metropolitan city, South Korea. The cause of fever and its classification were carefully decided and established by agreement through a discussion among board-certified clinicians in emergency medicine, neurology, general surgery, and internal medicine. The etiology of fever and its prevalence in ED were compared between before and after COVID-19. A total of 3,041 patients with fever (> 37.7°C) in the ED were investigated, with 1,400 men (46.0%). Their mean age was 55.88 ± 20.59, and the average number of patients with fever in ED was 8.16 ± 3.94 per a day. The most common etiology before COVID-19 was respiratory system infection (n = 535, 30.5%), followed by gastrointestinal (n = 313, 17.8%) and urinary tract infection (n = 209, 11.9%). However, after COVID-19, gastrointestinal cause became the most common (n = 247, 27.3%), followed by respiratory system (n = 126, 13.9%) and urinary tract infection (n = 102, 11.3%). There has been paradigm-shifting in fever etiology in the emergency department. It is necessary to cope with the changed fever etiology in the COVID-19 era.
유동욱,원충연 대한전자공학회 1996 전자공학회논문지-B Vol.b33 No.5
A novel resonant pulse control technique which generates high-quality sinusoidal output voltage from a resonant dc link inverter is presented for UPS applicatons. The proposed control technique limits resonant voltae overshoot without any passive or active clamp circuit, resulting in resonant pulses iwth uniform amplitude and high efficiency. The output voltage is controlled by the third order contorller iwth an inner loop of th efilter inductor current and the feedforward controller. Analysis and design of the proposed control technique are illustrated and verified on a 5kVA experimental unit.
전립선비대증 환자에서 전립선특이항원이 전립선용적을 예측할 수 있는가?
유동욱,박승철,서일영,임정식 대한비뇨의학회 2005 Investigative and Clinical Urology Vol.46 No.6
Purpose: To analyze the ability of serum prostate specific antigen(s-PSA) to predict the prostate volume by characterizing the relationship between the prostate volume and serum PSA in men with benign prostate hyperplasia. Materials and Methods: We evaluated 1,254 patients, with lower urinary tract symptoms, who had visited our hospital between Jan. 2002 and Aug. 2004. All patients with prostate cancer, prostatitis, and a history of prostatic surgery and alpha-blocker or 5-alpha reductase inhibitor medication were excluded from the study. The baseline s-PSA and prostate volume were determined using standard techniques. Pearson's correlation coefficient was used to analyze the relationship between the s-PSA and prostate volume, and a linear regression model to estimate the prostate volume. Receiver operating characteristics(ROC) curves were constructed to evaluate the ability of the s-PSA to predict cut-off values for assessing prostate enlargement. Results: The analyses included 959 patients, with mean age, baseline s-PSA and prostate volume of 68.2 years, 3.4ng/ml and 34.4ml, respectively. The s-PSA and prostate volume increased with age. The prostate volume correlated positively with s-PSA(r=0.292, p<0.01). The linear regression analyses showed that the s-PSA and prostate volume had an age-dependent linear relationship. According to the ROC curves, the optimal s-PSA cut-off values for the entire study population were 1.5ng/ml to detect a prostate volume>30ml and 2.0ng/ml to detect a prostate volume>40ml. Conclusions: The prostate volume is strongly related to the s-PSA and age in men with benign prostatic hyperplasia(BPH). Since treatment outcomes and the risk of long-term complications depend on the prostate volume, the serum PSA may sufficiently estimate prostate enlargement to be useful in therapeutic decision making in men with BPH.