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Trustworthy handover in LEO satellite mobile networks
Soyi Jung,Moon-Sik Lee,Jihyung Kim,Mi-Young Yun,Joongheon Kim,Jae-Hyun Kim 한국통신학회 2022 ICT Express Vol.8 No.3
Recently, a low earth orbit (LEO) satellite network is one of major systems to provide seamless access for terrestrial network systems. In order to provide robust access, efficient handover mechanisms are essential. However, conventional mechanisms may introduce frequent handovers due to the rapid movement of satellites. To deal with this problem, this paper proposes a learning-based auction handover under the consideration of received signal strength and service time between terrestrial users and satellites. The reason why auction-based approach is utilized is that it is generally considered as trustworthy. Our experiment results verify the proposed algorithm achieves desired performance.
COVID-19 환자의 흉부 CT 진단 정확도 보장을 위한 연합학습 스케줄링 연구
정소이(Soyi Jung),김중헌(Joongheon Kim),김재현(Jae-Hyun Kim) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문에서는 COVID-19 환자의 흉부 CT 진단 정확도 보장을 위한 공평한 연합학습 스케줄링 기법에 대하여 제안한다. 제안하는 방식을 적용하면 데이터가 불균형한 상황에서도 일정 수준의 정확도를 보장함과 동시에 학습 및 통신비용을 감소시키는 장점이 있다.
( Soyi Lim ),( Chae Min Lee ),( Jong Min Park ),( Sun Young Jung ),( Kwang Beom Lee ) 대한산부인과학회 2014 Obstetrics & Gynecology Science Vol.57 No.6
ObjectiveTo evaluate correlation of preoperative anemia with clinical outcomes in patients with early stage cervical cancer who were treated with radical hysterectomy and lymph node dissection. MethodsPatients who underwent radical hysterectomy and lymph node dissection for cervical cancer from January 2001 to February 2012 were included in this study. Clinicopatholgoical factors included in univariate and multivariate analysis were age, tumor histology, FIGO (International Federation of Gyneocology and Obstetrics) stage, preoperative hemoglobin, depth of invasion, tumor size, parametrial involvement, resection margin, and lymph node status. ResultsA total of 387 patients were retrospectively analyzed in this study; 141 patients (36.4%) had preoperative anemia (hemoglobin <12 g/dL) and 16 out of 141 patients (11.3%) received blood transfusion for correction of preoperative anemia. Patients with preoperative anemia showed significant association with age <50 years, more advanced stage, non-squamous cell carcinoma histology, larger tumor size, deeper stromal invasion, and lymph node metastasis (P<0.05). Both relapse-free survival and overall survival were worse in patients with preoperative anemia in univariate analysis. In multivariate analysis, overall survival was worse in patients with preoperative anemia, but relapse-free survival was not associated with preoperative anemia. In the intergroup analysis of anemic patients for the effect of preoperative blood transfusion, preoperative anemia correction did not affect survival. ConclusionPreoperative anemia was not an independent prognostic factor for survival in patients with early cervical cancer. However, it was associated with poor prognostic factors. Further study in large population is needed.
( Soyi Lim ),( Han Jung ),( Ryoon-seon Lee ),( Yoon-jin Cho ),( Kwang-beom Lee ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Objective: To evaluate the feasibility and safety of the laparoscopic corrective surgery for patient with ureter injury after gynecologic surgery. Methods: We retrospectively evaluated thirteen patients who underwent laparoscopic corrective surgery for distal ureter injury after gynecologic surgery. We reviewed the electronic medical records of clinical variables and perioperative outcomes. Results: All patients showed distal ureteral injury after gynecologic surgery and underwent laparoscopic corrective surgery. All corrective surgery was performed gynecologists with assistance of an urologist. Median age was 48 years. Laparoscopic hysterectomy (10/13, 76.9%) was most common gynecologic procedure before ureter injury. Seven out of thirteen patients (53.8%) showed right distal ureter injury and the remaining 6 (46.2%) patient had left distal ureter injury. They had corrective surgery at an average 10 days after gynecologic surgery. Four out of thirteen patients (30.8%) underwent laparoscopic psoas hitch, 4 (30.8%) underwent laparoscopic ureter end to end anastomosis, 3 (23.1%) underwent laparoscopic ureteroneocystostomy, 1 (7.7%) underwent laparoscopic ureter end to end anastomosis and bladder repair, and one patient (7.7%) underwent laparoscopic double J stent insertion and ureter closure for ureteral laceration. Mean operation time was 183.5 minutes and estimated blood loss was 193 mL. Mean hospital stay was 10.3 days and mean time to remove Foley catheter was 10.6 days. Men time to remove ureteral stent was 57.4 days. Noe of patient showed major or minor complication during postoperative and follow-up period. Conclusion: It is safe and feasible to perform laparoscopic corrective surgery by gynecologist for ureter injury.
Kyeongrok Kim,Soyi Jung,Jae-Hyun Kim 한국통신학회 2021 ICT Express Vol.7 No.2
As the number of low Earth orbit satellites is increasing, new algorithms and high-performance computing resources are needed to handle the enormous real-time arrival data generated by satellites. Based on the requirements, this paper proposes a novel real-time adaptive speckle filtering selection algorithm for satellite synthetic aperture radar (SAR) images. The use of high-performance filters generates high-quality images whereas it introduces delays. Thus, a real-time adaptive algorithm which achieves time-average SAR image quality maximization subject to delays using Lyapunov optimization, where the delay is formulated with a queuing model. Evaluation results show that the proposed algorithm guarantees desired performance improvements.