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시간 지연이 있는 2차 시스템에 대한 안정화 제어기 설계
배상욱,양정현,권재성,최성웅,김범수 한국마린엔지니어링학회 2019 한국마린엔지니어링학회지 Vol.43 No.7
In this paper, we propose the stability conditions for a second-order time-delay system using the Lambert W function. Oscillation and non-oscillation criteria for a second-order delay differential equation were obtained by defining two functions and using their graphical properties. The stability conditions were derived based on the non-oscillation criteria. Oscillation or unstable systems can be asymptotically stabilized by static state feedback, in which the feedback gain is easily determined. Finally, the effectiveness and merits of the proposed approach were demonstrated through numerical examples. 본 연구에서는 Lambert W 함수를 이용해서 시간 지연이 있는 2차 시스템에 대한 안정화 조건을 제시한다. 2차 시간지연 시스템의 실근 존재 여부를 두 개의 함수를 정의한 후 이 함수들의 그래프 특성을 이용해서 진동 및 비진동 조건을 구한다. 비 진동 조건으로부터 안정화 조건을 구한다. 그리고 진동하거나 불안정한 시스템을 상태 궤환제어를 통해서 점근적으로 안정화 시키는 제어 이득을 쉽게 구할 수 있음을 보인다. 마지막으로, 수치 예를 통해서 제시된 방법의효과와 장점을 보인다.
배상욱,신종승,박주현,김세광,박기현,안중미 연세대학교의과대학 2004 Yonsei medical journal Vol.45 No.2
The purpose of this study was to compare the perioperative complication rates of reconstructive pelvic surgery and general gynecologic surgery, and to identify the predictive risk factors for perioperative complications in reconstructive pelvic surgery. The medical records of 148 reconstructive pelvic surgery patients and 146 general gynecologic surgery patients were reviewed, and the types of complications, along with their rates and predictive risk factors were examined. The statistical analysis included descriptive statistics and logistic regression. There was no difference in the type of complications between reconstructive pelvic surgery and general gynecologic surgery. The prevalences of perioperative complications were 34.4% in the reconstructive pelvic surgery group and 26.7% in the general gynecologic surgery group. Intraoperative blood loss (p= 0.006) and the duration of surgery (p=0.014) were independent risk factors for perioperative complications in the reconstructive pelvic surgery group. The perioperative complication rates for the patients undergoing reconstructive pelvic surgery were not higher than those of the patients undergoing general gynecologic surgery, even though more procedures were performed and a longer duration of surgery was needed in the former cases. Since the duration of surgery and the amount of blood loss are the major factors affecting the complication rate, decreasing these two factors would be the key to improving the outcomes of patients undergoing reconstructive pelvic surgery.
체외수정시술을 위한 과배란 유도결과와 혈중 Inhibin의 상관관계
배상욱,정창진,장경환,이병석,박기현,조동제,송찬호,Bai, Sang-Wook,Jung, Chang-Jin,Chang, Kyung-Hwan,Lee, Byung-Suk,Park, Ki-Hyun,Cho, Dong-Jae,Song, Chan-Ho 대한생식의학회 1996 Clinical and Experimental Reproductive Medicine Vol.23 No.3
Serum inhibin concentrations, determimed by radioimmunoassay, were measured in women undergoing pituitary suppression with Decapeptyl and subsequently ovarian stimulation with Highly Purified-Metrodin(HP-FSH) to appraise follicular development. Early follicular basal serum inhibin level correlated with the number of oocytes retrieved(r=0.89, n=8, p<0.05). The number of oocytes retrieved showed a significant correlation with serum inhibin level on the day of hCG administration(r=0.73, n=8, p<0.05). The number of mature oocytes showed a significant correlation with serum inhibin level on the day of hCG administration(r=0.73, n=8, p<0.05). These data suggest that: (1) In the early follicular phase, basal serum inhibin may be a valid index to predict ensuing follicular growth : (2) In the preovulatory phase, maximum serum inhibin may be one of the indexes of follicular development during hyperstimulation cycles.
보조 생식술 결과에 있어서 기저혈중 Inhibin-B의 예후인자로서의 유용성
배상욱,김진영,이경술,원종건,이용주,이지원,장경환,이병석,박기현,조동제,송찬호,Bai, Sang-Wook,Kim, Jin-Young,Lee, Kyung-Sool,Won, Jong-Gun,Lee, Yong-Joo,Yi, Ji-Won,Chang, Kyung-Hwan,Lee, Byung-Seok,Park, Ki-Hyun,Cho, Dong-Jae,Song, Cha 대한생식의학회 1997 Clinical and Experimental Reproductive Medicine Vol.24 No.2
This study was performed to determine if women with day 3 serum inhibin-B concentrations <45pg/ml (conversion factor to SI unit, 1.00) demonstrate a poor response to ovulation induction and assisted reproductive technology outcome to women with inhibin-B${\ge}45pg$/ml, independant of day 3 FSH, E2 and patient age. From Jan 1996 to Dec 1996, 16 volunteers patients who underwent 25 IVF cycles with luteal phase GnRH agonist suppression and HMG stimulation were allocated to the study group. We evaluated day 3 serum inhibin-B, FSH, E2, peak E2, cancellation rate per initiated cycle (%) and clinical pregnancy rate per initiated cycle (%) according to the above two groups and independent of patient age, day 3 FSH, day 3 E2 and all of above combined. Women with day 3 serum inhibin-B${\ge}45pg$/ml demonstrated higher average day 3 inhibin-B level, clinical pregnancy rate per initiated cycle ($20.3{\pm}2.5$ pg/ml vs $80.9{\pm}5.0$ pg/ml, p<0.05; 24.8% vs 8.5%, p<0.05) and lower day 3 FSH level, cancellation rate per initiated cycle ($6.9{\pm}0.3$ mIU/ml vs $8.5{\pm}0.5$ mIU/ml, p<0.05; 1.5% vs 9.0%, p<0.05). Women with day 3 serum inhibin${\ge}45pg$/ml and age<40 year demonstrated higher pregnancy rate per initiated cycle (28.2% vs 7.4%, p<0.05) and lows. day 3 FSH level, cancellation rate per initiated cycle ($6.9{\pm}0.5$ mIU/ml vs $8.2{\pm}0.7$ mIU/ml, p<0.05; 1.0% vs 9.0%, p<0.05). Women with day 3 serum inhibin${\ge}45pg$/ml and day 3 FSH<15mIU/ml demonstrated higher pregnancy rate per initiated cycle (33.5% vs 9.5%, p<0.05) and lower day 3 FSH level, cancellation rate per initiated cycle ($7.7{\pm}0.2$ mIU/ml vs $8.5{\pm}0.5$ mIU/ml, p<0.05; 1.5% vs 10.0%, p<0.05). Women with day 3 serum inhibin${\ge}45pg$/ml and day 3 E2<50pg/ml demonstrated higher pregnancy rate per initiated cycle (30.0% vs 9.5%, p<0.05) and lower cancellation rate per initiated cycle (1.5% vs 9.5%, p<0.05). Women with day 3 serum inhibin${\ge}45pg$/ml, age<40 year, day 3 FSH<15mIU/ml and day 3 E2<50pg/ml demonstrated higher pregnancy rate per initiated cycle (30.0% vs 10.8%, p<0.05) and lower day 3 FSH level, cancellation rate per initiated cycle ($6.8{\pm}0.6$ mIU/ml vs $8.4{\pm}0.9$ mIU/ml, p<0.05; 1.5% vs 7.8%, p<0.05). Therefore women with low day 3 serum inhibin-B concentrations demonstrate a poorer response to ovulation induction and are less likely to conceive a clinical pregnancy though ART relative to women with high day 3 inhibin-B and day 3 serum inhibin-B, in addition to a day 3 FSH, E2 and patient age, appears helpful in prediction in IVF-ET outcome.
성인에서 발생한 도수 정복되지 않는 급성 요골두 전방 탈구 및 골절
배상욱,최윤선,김형석,송백용 대한수부외과학회 2014 대한수부외과학회지 Vol.19 No.2
Traumatic dislocation of the radial head without fracture of the olecranon isvery rare, especially in adults. We experienced a case of irreducible radial headdislocation with fracture without involvement of ulna. Open reduction andinternal fixation was performed. During surgery, brachialis was interposedbetween capitellum and radial head, and also interposed between the fragmentsat the fracture site of the radial head. At 12 months after operation, theradial head was well reduced with normal rotation. 성인에서 척골 골절이 동반되지 않은 외상성 요골두 전방 탈구는 매우 드물게 보고되고 있다. 저자들은 29세 여자에서발생한 요골두 골절과 동반된 비관혈적 도수 정복이 되지 않는 요골두 전방 탈구 환자를 경험하였고 수술 전 자기공명영상을 통하여 요골두와 소두 사이에 상완근이 감입되어 정복을 방해하는 소견과 더불어 요골두 골절편 사이에도 상완근과 관절낭이 감입되어 있었음을 확인하였다. 감입된 연부 조직을 빼내어 관혈적 정복을 시행하였고, 12개월간 추시관찰 결과 재탈구 또는 관절운동 제한 없이 만족스러운 결과를 얻을 수 있었다.
온라인 구전특성이 구전수용을 매개로 확산에 미치는 영향에 관한 연구
배상욱 한국자료분석학회 2008 Journal of the Korean Data Analysis Society Vol.10 No.6
This paper analyzes empirically the effect of sender´s expertise, receiver's expertise and vividness of online word-of-mouth information on the word-of-mouth adoption and diffusion. The key results are as follows. First, the sender's expertise is positively associated with the word-of-mouth adoption and has the biggest effect on the word-of- mouth adoption in comparison with other variables. Second, a receiver's expertise is not significantly associated with the word-of-mouth adoption. Third, the vividness of word-of- mouth information has significantly positive effect on word-of-mouth adoption. Fourth, the word-of-mouth adoption positively affects the word-of-mouth diffusion. Finally, we suggest the implications and future studies of this research based on the empirical results. 본 연구는 온라인 환경에서 구전정보 발신자의 전문성, 구전정보 수신자의 전문성, 구전정보의 생생함이 구전정보의 수용과 확산에 미치는 영향에 대하여 실증적으로 분석하였다. 이를 위해 공분산행렬과 최대우도법을 이용하여 실증분석 결과, 첫째, 구전정보 발신자의 전문성이 구전정보 수용에 긍정적으로 유의하게 나타났으며, 다른 요인들에 비하여 가장 큰 영향을 미치는 것으로 확인되었다. 둘째, 구전정보 수신자의 전문성이 구전정보 수용에 유의하게 나타나지 않아 기각되었다. 셋째, 구전정보의 생생함은 구전정보 수용에 긍정적으로 유의하게 영향을 미치는 나타났다. 넷째, 구전정보 수용과 구전정보 확산의도간의 긍정적인 관계도 확인되었다. 마지막으로 이러한 실증분석 결과를 토대로 시사점과 향후과제에 대하여 간략하게 논의하였다.