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Lee Gahyun,Park So Yun,Park Jae Hyun,Kang Seokjin 대한소아내분비학회 2023 Apem Vol.28 No.1
Purpose: Recent reports indicate that small for gestational age (SGA) could be a risk factor for delayed thyroid stimulating hormone (dTSH) elevation in preterm infants. The development of dTSH elevation in SGA late-preterm infants with a gestational age of 34–36 weeks has been investigated in only a few studies.Methods: In the present retrospective study, 70 SGA infants and 86 sex- and gestational age-matched controls who presented with normal results on initial thyroid function testing were included.Results: SGA infants had a significantly higher prevalence of dTSH elevation (15.7% vs. 3.5%, P=0.009) compared with appropriate-for-gestational age infants. In SGA infants, the mean age at the time of dTSH was 24 days. Development of dTSH was associated with SGA and medical treatment with dopamine or furosemide. After adjusting for confounding factors, multiple logistic regression analysis showed SGA was a significant risk factor for the development of dTSH elevation (odds ratio, 23.2; 95% confidence interval, 2.27–236.91; <i>P</i>=0.008).Conclusion: SGA infants may be at risk for dTSH and clinicians could consider a second thyroid screening test around the age of 1 month.
Embarrassed Radiofrequency Catheter Ablation of Supraventricular Tachycardia in Pectus Excavatum
Gahyun Lee,Ji-Eun Ban Ewha Womans University School of Medicine 2022 EMJ (Ewha medical journal) Vol.45 No.3
A 16-year-old patient with pectus excavatum visited our hospital because of palpitation. He underwent first Nuss operations at the age of 3. When he was 13 years old, the slow-fast type atrioventricular nodal reentrant tachycardia was documented during electrophysiology study. However, the catheter ablation was not conducted because of recurrent atrial fibrillation during procedure. At that time, second Nuss operation was performed due to progressive chest wall deformity. And then, atrioventricular nodal reentrant tachycardia was successfully treated by radiofrequency catheter ablation at the higher position than usual slow pathway zone under the modified fluoroscopic view with the cranial angle although distorted right atrial geometry and radiographic obstacle of Nuss operation bar. The concern about abnormal cardiac and electrical anatomy, and the accurate and modified procedure technique are essential in patients with pectus excavatum.
에지 보정을 이용한 ORB SLAM2의 특징점 정합률 개선
이가현(Gahyun Lee),이수원(Suwon Lee),서영건(Yeong-Geon Seo) 한국디지털콘텐츠학회 2021 한국디지털콘텐츠학회논문지 Vol.22 No.1
As a field of research on image recognition, a method of extracting key feature points and matching between images is used when recognizing or analyzing objects. Feature point extraction algorithms used here include SIFT, SURF, and ORB. ORB is used in autonomous driving technology along with visual SLAM technology that generates a map and estimates the location by recognizing and analyzing the surrounding space. In the case of autonomous driving, since the drivers safety is closely related to the occurrence of accidents between vehicles, image recognition technology is very important, so position estimation should be made based on faster analysis and accurate processing. In our study, to solve the problem, we propose a method to extract many feature points from the input image through image correction and to generate a new key by modifying the key frame generation condition, thereby reducing the position estimation and matching failure rate. As a result of the experiment, the matching rate improved by 43% and the number of new key frames increased.
이충현(Lee Chunghyun),이동현(Lee Donghyun),전용인(Jeon Yongin),오준석(Oh Junsuk),김가현(Kim gahyun),조성래(Sungrae Cho) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
본 논문에서는 보안을 위한 블록 체인 기반 모바일 네트워크에서 사용되는 암호 화폐에 대하여 조사하고, 최근 연구되어 사용되는 암호 화폐의 핵심기술과 알고리즘을 분석한다. 또한, 연구된 암호 화폐의 응용 사례와 보다 실용적인 방안으로 연구 개발되는 신규 암호 화폐에 대하여 조사하여 모바일 네트워크 시스템에 접목할 수 있는 다양한 관점에서의 암호 화폐의 공헌들을 분석한다.
Baek, Gahyun,Kim, Jinsu,Lee, Seungyong,Lee, Changsoo Elsevier 2017 Bioresource technology Vol.241 No.-
<P><B>Abstract</B></P> <P>Functioning biocathodes are essential for electromethanogenesis. This study investigated the development of a biocathode from non-acclimated anaerobic sludge in an electromethanogenesis cell at a cathode potential of −0.7V (vs. standard hydrogen electrode) over four cycles of repeated batch operations. The CO<SUB>2</SUB>-to-CH<SUB>4</SUB> conversion rate increased (to 97.7%) while the length of the lag phase decreased as the number of cycles increased, suggesting that a functioning biocathode developed during the repeated subculturing cycles. CO<SUB>2</SUB>-resupply test results suggested that the biocathode catalyzed the formation of CH<SUB>4</SUB> via both direct and indirect (H<SUB>2</SUB>-mediated) electron transfer mechanisms. The biocathode archaeal community was dominated by the genus <I>Methanobacterium</I>, and most archaeal sequences (>89%) were affiliated with <I>Methanobacterium palustre</I>. The bacterial community was dominated by putative electroactive bacteria, with <I>Arcobacter</I>, which is rarely observed in biocathodes, forming the largest population. These electroactive bacteria were likely involved in electron transfer between the cathode and the methanogens.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Biocathode development during repeated electromethanogenesis cycles was monitored. </LI> <LI> A CH<SUB>4</SUB>-forming biocathode was successfully developed during the subculturing cycles. </LI> <LI> The CO<SUB>2</SUB>-to-CH<SUB>4</SUB> conversion rate increased while the lag time decreased over cycles. </LI> <LI> CH<SUB>4</SUB> was likely produced via both direct and indirect electron transfer mechanisms. </LI> <LI> <I>Methanobacterium</I> and electroactive bacteria dominated the biocathode community. </LI> </UL> </P>
김가현(Gahyun Kim),이충현(Chunghyun Lee),이정화(Jeonghwa Lee),조성래(Sungrae Cho) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문은 LEO 위성 네트워크에서 핸드오버 성능을 향상시킬 수 있는 알고리즘 연구 동향에 대해 서술한다. 강화학습, 게임이론, 네트워크 흐름에 기초한 중앙 집중 전략을 핸드오버에 적용한 연구를 통해 해당 알고리즘을 분석하였다. 또한, 해당 알고리즘을 실제로 적용한 사례를 통해 핸드오버 성능이 향상된 것을 확인하였다.