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홍석균,강수원,류재호,이희준,이용환 에스케이텔레콤 (주) 1998 Telecommunications Review Vol.8 No.4
음성 대역 모뎀은 제한된 주파수 대역폭을 최대로 활용하기 위한 고효율의 변복조 기법 사용이 요구된다. 본 논문에서는 최고 전송속도가 33.6kbps인 ITU V.34 모뎀의 구현에 대해 기술한다. V.34의 핵심 변복조 기술로는 실시간 선로 특성분석에 따른 적응적 대역 이용 알고리듬, 다차원 트렐리스 부호화 기법과 비정수 갯수의 신호점 매핑 기술, 비선형 등화기법인 flexible precoding 기법이 사용된다. 선형 등화기와 반향 제거기를 빠르게 초기화하기 위한 고속 훈련 알고리듬과 많은신호점을 가진 QAM신호에 적합한 반송파 복원기, 타이밍 복원기의 설계를 기술한다. 전체 시스템은 VLSI구현에 적합한구조로 설계하였으며, 그 중 모뎀의 송수신기는 범용 DSP를 사용하여 실장하고 디지털 전단부와 주변 로직 회로를 ASIC로제작, 실장하였으며 아날로그 전단부는 범용 소자를 사용하여 구현하였다. 디지털 전단부는 다중 포트를 지원할 수 있는 고급 기능을 갖고 있으며 아날로그 전단부는 적응 하이브리드를 구현하여 성능을 향상시켰다. 구현된 모뎀은 Rockwell, USRobotics 모뎀 등과 호환성을 유지하며 상용 모뎀과 대등한 전송 성능을 갖고 있다.
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카본블랙의 종류 및 배합제의 혼합방법에 따른 NR/HNBR 블렌드의 특성
洪錫勻,庾吉祥,金鍾石,崔相久 全北大學校 1992 論文集 Vol.34 No.-
It was studied how physical properties, heat resistance, oil resistance, ozone resistance of NR(natural rubber)/HNBR(hydrogenated acrylonitrile butadiene rubber) blends influenced by different mixing methods and various carbon black types. Of the various mixing methods, masterbatch mixing method was better than others in considering the overall stabilities of the compounds. The most important parameter which influenced on heat, oil and ozone resistance was rubber material than sorts of carbon black. The resistance for heat, oil and ozone of NR compounds were improved by blending HNBR and these effects were revealed clearly at elevated temperatures.
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시-주파수 분석법을 이용한 시각자극 유발전위에 관한 연구
홍석균,성홍모,윤영로,윤형로 대한의용생체공학회 2001 의공학회지 Vol.22 No.3
The visual evoked potentials(VEPs) is used to assist in the diagnosis of specific disorders associated with involvement of the sensory visual pathways. The P100 latency is an important parameter which is diagnosis of optic nerve disorders. There are characteristics of latency delay, wave distortion, amplitude deduction in abnormal subjects. It is difficult to diagnose in the case of producing peak at the P100 latency. In this paper, difference of pattern between normal VEPs and abnormal VEPs using the Choi-Williams distribution method is studied. We observed the relationship about time and spectrum. The result shown that normal VEPs had maximum spectral value at 20Hz~26.7Hz and abnormal VEPs had maximum spectral value at 16.7Hz~20Hz. Also normal VEPs spectrum is higher than abnormal VEPs spectrum.
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홍석균,장진영,강미주,In Woong Han,김선회 대한의학회 2012 Journal of Korean medical science Vol.27 No.4
The aim of this study was to compare the clinical outcome and cost-effectiveness of preoperative biliary drainage (BD) methods in periampullary cancer, and to suggest guidelines for selecting the appropriate preoperative BD method. Between October 2004and August 2010, 211 patients underwent pancreatoduodenectomy after preoperative BD. Clinical outcome and cost-effectiveness of the preoperative BD methods were compared based on the final drainage method used and on intention-to-treat analysis. There was no significant difference in drainage duration between percutaneous transhepatic biliary drainage (PTBD) and endoscopic BD groups (14.2 vs 16.6 days, respectively; P = 0.121) but daily diminution of serum bilirubin level was higher in the PTBD group (0.7 vs 0.6 mg/dL/day, respectively; P = 0.041). Based on intention-to-treat analysis, drainage duration was shorter (13.2 vs 16.5 days, respectively; P = 0.049), daily diminution of serum bilirubin level was higher (0.7 vs 0.6 mg/dL/day, respectively; P = 0.041). Medical care cost was lower (14.2 vs 15.7 × 103 USD, respectively; P = 0.040) in the PTBD group than in the endoscopic BD group. When selecting the preoperative BD method, practitioners should consider that PTBD is more cost-effective and safer than endoscopic BD.
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시행한 복강경 복막 투석 도관 삽입술과 개복 삽입술의 비교 연구
홍석균,김수홍,하일수,정성은,박귀원,김현영 대한내시경복강경외과학회 2011 Journal of Minimally Invasive Surgery Vol.14 No.2
Purpose: Laparoscopic continuous ambulatory peritoneal dialysis (CAPD) catheter insertion is used instead of open CAPD insertion because additional measures to prevent complications can be made without a conventional laparotomy. This study compared the early experience of laparoscopic CAPD catheter insertion with open CAPD insertion in children. Methods: Between January 2006 and May 2011, 52, 16 and 36 patients who underwent CAPD insertion, laparoscopic CAPD insertion and open CAPD insertion, respectively, for end stage renal disease at Seoul National University Children’s Hospital were enrolled in this study. The clinicopathological factors, operative factors and outcomes were analyzed by a retrospective medical record review. Results: The mean operative time of the laparoscopic group was longer than that of the open groups (78 minutes vs 60 minutesm, p value=0.079). In the laparoscopic group, 3 patients underwent closure of the processus vaginalis and the occurrence of an inguinal hernia was prevented, whereas 3 patients in the open group underwent herniorrhaphy for an inguinal hernia. The mean period of catheter use in the laparoscopic and open group was 201 and 984 days, respectively. Complications occurred more frequently in the open group than in the laparoscopic group (14 patients (38.9%) vs. 2 patients (12.5%), p value=0.059). Peritonitis (19.4%) was the most common complication, which occurred only in the open group, followed by catheter obstruction due to omental wrapping. Catheter migration occurred more frequently in the open group (20%) than the laparoscopic group (12.5%). Conclusion: These results suggest that laparoscopic CAPD catheter insertion can be a suitable method for CAPD catheter insertion in children.
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홍석균,이광웅,Kim Jae-Yoon,Lee Jaewon,Kim Jiyoung,Choi Hyun Hwa,Hong Su Young,이정무,최영록,이남준,서경석 대한이식학회 2023 Korean Journal of Transplantation Vol.37 No.3
Background: Pretransplant therapies such as rituximab and plasmapheresis have led to an increase in ABO-incompatible (ABOi) living donor liver transplantation (LDLT), thus helping to overcome organ shortages. This study evaluated the changes in anti-A/B titers and CD19 levels over time in patients undergoing ABOi LT and aimed to understand the effect of single-nucleotide polymorphisms (SNPs) in Fc gamma receptor (FcγR) on rituximab therapy. Methods: Two SNPs of FCGR2A (131H/R) and FCGR3A (158F/V) were identified. The clinical data on 44 patients who underwent ABOi LDLT between May 2019 and October 2021 at Seoul National University Hospital were reviewed retrospectively. Results: Following desensitization with rituximab and subsequent LDLT, the anti-A/B titer recovered within 1 week, but decreased thereafter. The CD19 level increased at 3 months after LT. The genotyping data for FCGR3A (158F/V) indicated that two patients had the V/V genotype, and 42 had the F/V genotype. In the genotyping data for FCGR2A (131H/R), 21 patients had the H/H genotype, three had the R/R genotype, and 20 had the H/R genotype. However, there were no significant differences in anti-A/B and CD19 levels, bacteremia rates, T cell-mediated rejection, antibody-mediated rejection, or the survival rate among the FCGR2A types. Conclusions: There were significant changes in the anti-A/B titers and CD19 levels over time in each patient after ABOi LDLT. The difference in outcomes following LT according to the FcγR SNP type for rituximab was unclear. Further studies with larger sample sizes are needed to confirm the effect of FcγR SNPs on rituximab therapy.
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