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- 저자 : Jong Kyou Kwon (검색결과 12 건)
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Jong Kyou Kwon,Joo Yong Lee,Hae Do Jung,Cheol Kyu Oh,최영득,조강수 대한남성과학회 2015 The World Journal of Men's Health Vol.33 No.3
Purpose: To evaluate the association of self-reported erectile function and endothelial function using the EndoPAT device.Materials and Methods: We prospectively enrolled 76 men (age≥40 years) after obtaining a complete medical history and a self-reported questionnaire (International Index of Erectile Function-5 [IIEF-5], SEP Q2, Q3). Endothelial function was non- invasively measured with an EndoPAT 2000, recorded as the reactive hyperemia index (RHI), and analyzed according to the patients’ baseline characteristics.Results: The mean patient age and IIEF-5 score were 62.50±8.56 years and 11.20±6.36, respectively. In comparing the RHI according to erectile dysfunction (ED) risk factors, the RHI was significantly lower in older subjects (p=0.004). There was no difference in the RHI according to age, body mass index, waist circumference, obesity, smoking habit, or other comorbidities. When the subjects were divided into four groups according to the severity of ED, no statistical differences in the RHI value were found among the groups. There was no difference in IIEF-5 according to the RHI when categorized according to the normal cutoff value or quartile ranges. The second subdomain of IIEF-5 (erection firmness) was significantly correlated with the RHI value (R=0.309, p=0.007); however, this was not the case with the other IIEF-5 subdomains. Self-assessment showed a tendency toward a negative correlation with the RHI value (R=−0.202, p=0.080).Conclusions: The role of endothelial function measurement by the EndoPAT in the evaluation and management of ED patients remains inconclusive. However, further studies are needed to validate the role of endothelial function measurement, by the EndoPAT or any other device.
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권종규(Jong Kyou Kwon),오철규(Cheol Kyu Oh) 대한비뇨기종양학회 2015 대한비뇨기종양학회지 Vol.13 No.1
Laparoscopic adrenalectomy has been the standard method for resecting adrenal gland tumors. Recently, laparoscopic retroperitoneal adrenalectomy (RA) has been more popular than conventional transperitoneal laparoscopic adrenalectomy (TLA) as an alternative method. Studies comparing laparoscopic RA and TLA showed that laparoscopic RA was superior or at least comparable to TLA in operation time, blood loss, pain score, hospital stay, and return to normal activity. Conversion rates and complication rates were similar. At present, laparoscopic RA has been int the limelight procedure for patients with benign adrenal disease. However, surgeons have been reluctant to offer this operation to patients because of the concerns over inadequate working space and overall perceived higher rate of complications, laparoscopic RA is not popular in urologic field up to now. This article summarizes the latest ideas and issues on laparoscopic RA in the expanding field of laparoscopy in urology.
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정종규(Jong-kyou Jeong),윤동진(Dong-Jin Yun),권기현(Ki-Hyun Kwon),한병문(Byung-Moon Han) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
본 논문은 계통연계형 열병합발전의 동작특성을 모의하는 시뮬레이션모델에 관해 기술하고 있다. 계통연계형 열병합발전은 가스엔진, 영구자석발전기, 전력변환기로 구성되어 있는데 본 연구에서는 가스엔진은 일정출력을 공급하고 다극형 영구자석발전기에서 생산되는 400㎐ 출력을 컨버터와 인버터를 통하여 상용주파수의 교류로 전력계통과 연계하는 것으로 가정하였다. 개발된 시뮬레이션모델을 PSCAD/EMTDC를 이용하였고 전력회로는 내장모듈을 그리고 제어기는 C 프로그램으로 직접 개발하였다. 개발된 PSCAD/EMTDC 시뮬레이션모델을 이용한 다양한 시뮬레이션을 실시하여 하드웨어 시뮬레이터를 설계하였다.
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신정맥과 하대정맥의 침범이 있는 상피모양 변화를 동반하지 않은 신혈관근지방종
박상호(Sang Ho Park),권종규(Jong Kyou Kwon),장인호(In Ho Chang),김정훈(Jung Hoon Kim),임송원(Song Won Lim) 대한비뇨기종양학회 2013 대한비뇨기종양학회지 Vol.11 No.1
Tumor thrombus in renal vein or inferior vena cava is rare in patients with renal angiomyolipoma, which is a common benign neoplasm of kidney, especially without potential malignant transformation as epithelioid angiomyolipoma. A 58-year-old female who has known to have a fat containing renal mass in the right kidney, incidentally found by abdominopelvic computed tomography at 2004, was referred to the department of urology with a problem of increased size of the renal mass on computed tomography scan. In this case surgical treatment was clinically necessary due to the invasion of the renal vein and inferior vena cava. The mass and thrombi were excised successfully and the pathology results confirmed that both mass and thrombi are benign angiomyolipoma without any variant histologic differentiation. It must be concerned that vascular invasion can arise from conventional, asymptomatic, and small angiomyolipoma when the physicians decide to have conservative management with surveillance.
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자율주행 자동차용 전동회전시트 상부회전판의 핫스탬핑 성형에 관한 연구
육형섭(Hyung-sub Yook),편종권(Jong-Kweon Pyun),서창희(Chang-Hee Suh),오상균(Sang-Gyun Oh),권태하(Tae-Ha Kwon),김병기(Byung-Ki Kim),박동규(Dong-Kyou Park) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.10
Seats in autonomous vehicles must be able to rotate to fully utilize the interior space. Generally, ultra-high strength steel is used for the rotation module because it should have high strength and high rigidity. In addition, the rotating parts are difficult to form because they have complex shapes. In this study, the upper plate of the rotating module, whose complex shape makes it difficult to form, was formed by applying the hot stamping method. The drawing method and the form-drawing method, which are generally used to form components of complex shapes, were compared. We showed that the form-drawing method increased the degree of freedom of the material flow to improve the formability, thus enabling the forming of the plate. In addition, the die and blank shapes were found to be important factors in determining the success of the hot stamping. The validity of the analysis results was confirmed through forming analysis and experiments.
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영구자석동기발전기 풍력시스템의 하드웨어 시뮬레이터 개발
윤동진(Dong-Jin Yun),정종규(Jong-Kyou Jeong),양승철(Seung-Chul Yang),권기현(Gi-hyun Kwon),한병문(Byung-Moon Han) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
This paper describes development of hardware simulator for the PMSG wind power system, which was designed considering wind characteristic, blade characteristic and blade inertia compensation. The simulator generates torque and speed signals for a specific wind turbine with respect to given wind speed. This torque and speed signals are scaled down to fit the input of 2㎾ PMSG. The PMSG-side converter operates to track the maximum power point, and the grid-side inverter controls the active and reactive power supplied to the grid. The operational feasibility was verified by computer simulations with PSCAD/EMTDC, and the implementation feasibility was confirmed through experimental works with a hardware set-up.
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Daily Mean Temperature Affects Urolithiasis Presentation in Seoul: a Time-series Analysis
Lee, SeoYeon,Kim, Min-su,Kim, Jung Hoon,Kwon, Jong Kyou,Chi, Byung Hoon,Kim, Jin Wook,Chang, In Ho The Korean Academy of Medical Sciences 2016 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.31 No.5
<P>This study aimed to investigate the overall cumulative exposure-response and the lag response relationships between daily temperature and urolithiasis presentation in Seoul. Using a time-series design and distributing lag nonlinear methods, we estimated the relative risk (RR) of urolithiasis presentation associated with mean daily temperature, including the cumulative RR for a 20 days period, and RR for individual daily lag through 20 days. We analyzed data from 14,518 patients of 4 hospitals emergency department who sought medical evaluation or treatment of urolithiasis from 2005-2013 in Seoul. RR was estimated according to sex and age. Associations between mean daily temperature and urolithiasis presentation were not monotonic. Furthermore, there was variation in the exposure-response curve shapes and the strength of association at different temperatures, although in most cases RRs increased for temperatures above the 13°C reference value. The RRs for urolothiasis at 29°C vs. 13°C were 2.54 in all patients (95% confidence interval [CI]: 1.67-3.87), 2.59 in male (95% CI, 1.56-4.32), 2.42 in female (95% CI, 1.15-5.07), 3.83 in male less than 40 years old (95% CI, 1.78-8.26), and 2.47 in male between 40 and 60 years old (95% CI, 1.15-5.34). Consistent trends of increasing RR of urolithiasis presentation were observed within 5 days of high temperatures across all groups. Urolithiasis presentation increased with high temperature with higher daily mean temperatures, with the strongest associations estimated for lags of only a few days, in Seoul, a metropolitan city in Korea.</P>
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