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Hohyun Kim,Chan Yong Park,Jae Hyuk Lee,Jung Chul Kim,Chol-Kyoon Cho,Hee Jun Kim 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.88 No.4
Purpose: This study aimed to evaluate the clinical significance of Ki-67 and p53 expressions in patients with pancreatic head cancer. Methods: Between May 2008 and April 2013, immunohistochemical staining for Ki-67 and p53 was performed in 34 patients with pancreatic head cancer (ductal adenocarcinoma). All 34 patients underwent pancreaticoduodenectomy at Chonnam National University Hwasun Hospital, Hwasun, Korea. Clinical and histopathological characteristics were analyzed, relative to p53 expression. Results: Thirty (88.2%) and twenty-one (61.7%) of the 34 pancreatic head cancers exhibited positive expression of Ki-67 and p53, respectively. Patients expressing Ki-67 and p53 experienced more frequent tumor recurrences within 1 year after surgical resection (P = 0.003 and P = 0.030, respectively). However, no correlation was detected between Ki-67 and p53 expression. Ki-67 expression was correlated with pathological grade, lymph node metasatsis, and clinical stage (P < 0.05). Importantly, Ki-67 was the independent predictive factor for postoperative recurrence within 1 year in both univariable and multivariable analyses (odds ratio, 27.219; 95% confidence interval, 1.403?528.135; P = 0.029). Conclusion: The expression of Ki-67 and p53 are significantly related to early postoperative recurrence within 1 year after surgical resection in pancreatic head cancer. Especially, Ki-67 was the independent predictive factor for postoperative recurrence within 1 year. Therefore, immunohistochemical staining for Ki-67 and p53 may be applied as a predictive marker for early postoperative recurrence in pancreatic head cancer.
( Hohyun Kim ),( Jae Hun Kim ),( Gil Hwan Kim ),( Hyun-woo Sun ),( Chan Ik Park ),( Sung Jin Park ),( Chan Kyu Lee ),( Suk Kim ) 대한외상학회 2020 大韓外傷學會誌 Vol.33 No.2
Traumatic abdominal wall hernias (TAWHs) are uncommon and the incidence of this, which is rarely encountered in clinical practice, has been estimated at 1%. Furthermore, blunt transection of the entire abdominal wall musculature caused by seatbelt is a very rare complication. We report a case of adult with a complete disruption of the entire anterolateral abdominal wall muscle following the seatbelt injury. A 32-year-old male was wearing a seat belt in a high speed motor vehicle collision. Abdominal computed tomography (CT) scan revealed the complete disruption of bilateral abdominal wall musculatures including TAWH without visceral injury. However, injuries of small bowel and sigmoid colon were observed in the intra-operative field. The patient underwent the repair by primary closure of the defect with absorbable monofilament sutures. This case suggests that especially in TAWH patients, even if a CT scan is normal, clinicians should keep the possibility of bowel injury in mind, and choose a treatment based on the clinical findings.
Kim, Yunjoong,Kim, Mingu,Han, Bumku,Kim, Youdan,Shin, Hohyun The Korean Society for Aeronautical and Space Scie 2017 International Journal of Aeronautical and Space Sc Vol.18 No.2
The optimum design of an SAR (Synthetic Aperture Radar) satellite constellation is developed herein using a genetic algorithm. The performance of Earth observations using a satellite constellation can be improved by minimizing the maximum revisit time. Classical orbit design using analytic methods has limitations when addressing orbit dynamics due to various disturbances. To overcome this issue, an optimization technique based on a genetic algorithm is used. STK (Systems Tool Kit) is utilized to propagate the satellite orbit when considering external disturbances, and the maximum revisit time on the earth observation area is calculated. By minimizing the performance index using a genetic algorithm, the optimum orbit of the satellite constellation is designed. Numerical results are provided to demonstrate the performance of the proposed method.
( Hohyun Kim ),( Chan-yong Park ),( Hyun-min Cho ),( Kwang-hee Yeo ),( Jae Hun Kim ),( Byungchul Yu ),( Seung-je Go ),( Oh Sang Kwon ) 대한외상학회 2019 大韓外傷學會誌 Vol.32 No.1
Purpose: The Essential Surgical Procedures in Trauma (ESPIT) course was developed as a model to teach necessary surgical procedures to trauma physicians. Its goals are to improve knowledge, self-confidence, and technical competence. Methods: The ESPIT course consisted of five lectures and a porcine lab operative experience. The ESPIT course has been run seven times between February 2014 and April 2016. ESPIT participants completed a questionnaire to assess self-efficacy regarding essential surgical procedures in trauma before and immediately after taking the ESPIT course. Sixty-three participants who completed both pre- and post-course questionnaires on self-efficacy were enrolled in this study. Results: The overall post-ESPIT mean self-efficacy score was higher than the pre-ESPIT mean self-efficacy score (8.3±1.30 and 4.5±2.13, respectively) (p<0.001). Self-efficacy was significantly improved after the ESPIT course in general surgeons (p<0.001), thoracic and cardiovascular surgeons (p<0.001), emergency medicine doctors, and others (neurosurgeons, orthopedic surgeons) (p<0.001). The differences in self-efficacy score according to career stage (< 1 year, 1-3 years, 3-5 years, and >5 years) were also statistically significant (p<0.001). Conclusions: The data of the ESPIT participants indicated that they felt that the ESPIT course improved their self-efficacy with regard to essential surgical procedures in trauma. The ESPIT course may be an effective strategy for teaching surgical procedures, thus promoting better management of traumatic injuries.
Compensation Structure of Family Business Groups
Hohyun Kim,Seung Hun Han 한국경영학회 2016 한국경영학회 통합학술발표논문집 Vol.2016 No.8
This study examines the compensation structure in Korea, where CEO compensation has been mandated to disclose as public information since 2013, focusing on family CEOs of business group (chaebols). We find that total CEO compensation level is indifferent between chaebol and non-chaebol firms but chaebol firms provide compensation mix with less proportion of bonus. Also, while non-chaebol firms set performance-contingent CEO compensation, chaebol firms do not. Furthermore, among the chaebol firms, family CEOs receive more total compensation than non-family CEOs, but the bonus level is similar to the non-family CEOs’. Despite the high total compensation level of family CEOs, firms with family CEOs show lower profitability than industry-average. It implies rent extraction through compensation by controlling families in Korean business groups.
Compensation structure of family business groups
Hohyun Kim,Seung Hun Han 한국재무학회 2018 한국재무학회 학술대회 Vol.2018 No.05
We examine executive compensation structures with a focus on family business groups in Korea. Our results show that Korean family business groups provide 60% more total compensation to CEOs who are family members than to professional CEOs. This excessive increment is not based on performance-contingent payments, but on fixed payments. Our propensity score matching and difference-in-differences analyses robustly support these results. Further, we find that operation of internal capital markets, CEO talents, CEO stock ownership, and family board membership do not explain the excessive compensation of family CEOs in family business groups. The evidence indicates rent extraction through executive compensation in family business groups.