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명암값 분포를 이용한 자동화된 간과 비장의 정교한 추출
유승화(Seung Wha Yoo),성윤창(Yun Chang Sung),조준식(June Sik Cho),노승무(Seung Moo Noh),신경숙(Kyung Suk Shin),박종원(Jong Won Park) 한국정보과학회 2001 정보과학회논문지 : 시스템 및 이론 Vol.28 No.1·2
Because each organ has a gray value range of its own and its different ratio, in this study, we segmented the organ from the noise part with this gray value portion. We represented the organ with mesh images and made a template that is the rough outline of the organ. In the location searching process, that is to find the organs location, we traced not only the organ itself but also the separated organ. To represent the outline of the organ, we used the subtraction method from the binary image, so that even the tip of the organ could be represented minutely. With the proposed opening and closing methods in this paper, we reduced the runtime of the process in comparison with the existing algorithm. We computed the volume calculation from the segmented organ size and presented a clinical demonstration with the animal experiment. 각 장기는 고유한 명암값의 범위와 각 명암값에 대한 서로 다른 비율을 지니고 있으므로 제안된 연구에서는 이러한 명암값의 비율을 이용하여 장기의 영역과 노이즈를 구분할 수 있도록 하였다. 장기의 영역을 세 종류의 메쉬영상으로 표현하여 이들의 유니온 영상으로 장기의 전반적인 형태인 템플리트를 생성하였다. 템플리트 방식은 기존의 방식에서 명암값의 범위가 같은 노이즈의 제거가 어려운 단점을 해결하여 장기의 영역만을 분리할 수 있었다. 장기의 위치를 탐색하기 위한 위치탐색과정에서는 장기의 존재여부의 파악과 함께 분리된 장기까지 추적할 수 있도록 하였다. 외곽선 표현을 위해서는 템플리트로 이진영상에서 서브트랙션(subtraction)하는 방법을 사용하여 장기의 말단부위까지 세밀하게 표현하였다. 제안된 연구에서 사용된 오프닝과 클로징 방법으로 기존의 structuring element를 사용하는 방법에 비해 처리 속도를 단축시킬 수 있었다. 추출된 장기의 면적을 토대로 체적계산을 시행하였고 동물실험을 통하여 임상실험치를 제시하였다.
복부 CT 영상에서 메쉬 필터를 이용한 간과 비장의 추출에 대한 연구
유승화(Seung-Wha Yoo),성윤창(Yun-Chang Sung),유현경(Hyun-kynug Yoo),김재평(Jae-Pyung Kim),조준식(June-Sik Cho),노승무(Seung-Mu Noh),신경숙(Kyong Suk Shin),박종원(Jong-Won Park) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1B
본 논문에서는 복부 방사선 CT 영상에서 간과 비장의 추출 및 추출된 장기의 체적을 구하는 방법에 대하여 연구하였다. 이를 위하여 각 장기를 구성하는 픽셀의 명암 값에 대한 정보 및 위치에 대한 정보를 이용함에 있어서 각 CT 영상에서 간과 비장의 명암 값을 자동적으로 추정하기 위해 메쉬 필터를 이용하였으며 또한 위치 탐색선을 이용하여 분리된 장기를 정확하게 검출할 수 있도록 구현하였다. 한편 트리밍 과정으로 추출된 장기의 정확성을 향상시킬 수 있도록 하는 방법과 산출된 체적의 오차감소를 위한 방법에 대해서도 연구하였다.
관상동맥 우회술및 판막대치술환자에서 체외순환 전·후의 대퇴·요골동맥압간의 차이의 변화 비교
유은숙,방서욱,홍용우,곽영란,임현경,한승연,장정화 대한마취과학회 1997 Korean Journal of Anesthesiology Vol.32 No.2
Background : It has been known that pressure gradient(PG) between systolic radial arterial pressure(RAP) and systolic aortic pressure(AP) is often altered after cardiopulmonary bypass(CPB). In this study, we compared radial to femoral arterial pressure(FAP) difference between valve replacement(VR) group(n=189) and coronary artery bypass graft (CABG) group(n=90). Methods : With IRB approval, anesthesia management followed the standard method for cardiac surgery. Heart rate, RAP, FAP, cardiac index(CI), forearm skin temperature, hematocirt and systemic vascular resistance index(SVRI) were recorded at before-CPB, after-CPB and after sternal closure. Results : In CABG group, there was no change of PG between RAP and FAP before and after CPB. In VR group, systolic RAP was similar with FAP before CPB but the radial-femoral arterial pressure gradient was reversed with statistical significance after bypass. Compare with CAGB group, change of pressure gradient after CPB cousiderded statistical significant in valve replacement group. CI was increased and SVRI was decreased with statistical significance. Conclusion : In our study, patients in VR group who demonstrated high CI and low SVRI showed reversal of PG upon cessation of CPB. Reversal of PG at post-CPB probably partially depends on the degree of systemic vasodilation upon discontinuation of CPB. (Korean J Anesthesiol 1997; 32: 260∼266)
부등률 적용 개선을 통한 변압기의 적정용량 산정에 관한 연구
서승관(Seung-Kwan Seo),오용택(Yong-Taek Oh),김세동(Se-Dong Kim),신화영(Wha-Young Shin),유상봉(Sang-Bong Yoo),이진(Jin Lee) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.8
전력용변압기 용량을 산정하는데 있어서 수용률 및 부등률, 단위세대의 표준 부하용량은 매우 중요한 기준이다. 본 연구에서는 60[㎡] 이하의 임대아파트를 대상으로 각 수용가의 계약전력과 최근 5년 동안의 최대전력을 조사하였다. 조사된 자료의 전체 특징과 중심적인 경향을 알아 보기 위해서 평균값 등의 특징파라미터를 분석하였고, 회귀분석을 통하여 그 경향을 분석하였다. 모든 단지가 전력용변압기의 여유가 많은 것을 확인하였고, 적정용량 산정을 위한 부등률 기준을 제안하였다. This paper shows a reasonable diversity factor, that was made by the systematic and statistical way considering actual conditions, such as investigated contract power and peak power for the last 5 years of each customer for 20 Lease Apartment. In this paper, it is necessary to analyze the key features and general trend from the investigated data. It made an analysis of the feature parameters, such as average, standard deviation, median, maximum, minimun and thus it was carried out by the linear and nonlinear regression analysis. The standards of demand, diversity, and load density are necessary to create the design of a transformer capacity that is seldom presented in terms for academic study.
Han, Seung Hyeok,Lee, Sang Choel,Kang, Ea Wha,Park, Jung Kyung,Yoon, Hyang Sook,Yoo, Tae-Hyun,Choi, Kyu Hun,Han, Dae-Suk,Kang, Shin-Wook SAGE Publications 2012 Peritoneal dialysis international Vol.32 No.2
<B>♦Background</B><P> Endothelial dysfunction, which contributes to atherosclerosis and arteriosclerosis, commonly accompanies end-stage renal disease (ESRD). However, little is known about the role of residual renal function (RRF) in endothelial protection in ESRD patients. This study aimed to investigate the relationship between endothelial function and RRF in patients undergoing peritoneal dialysis (PD). </P><B>♦Methods</B><P> This was a cross-sectional study involving 72 prevalent PD patients. Demographic and clinical data were recorded and residual glomerular filtration rate (GFR), Kt/V urea, and serum concentrations of inflammatory markers were measured. Endothelial function was assessed by brachial artery endothelium-dependent vasodilation [flow-mediated dilation (FMD)] to reactive hyperemia following 5 minutes of forearm ischemia. </P><B>♦Results</B><P> In patients with FMD% above the median value (FMD @@>@@ 2.41%), residual GFR was significantly higher compared to that in patients with FMD% below the median [1.50 (0 - 9.64) vs 0.48 (0 - 3.89) mL/min/1.73 m<SUP> 2</SUP>, P = 0.026]. Correlation analyses revealed that residual GFR (p = 0.381, P = 0.001) and total Kt/V urea (γ= 0.408, P @@<@@ 0.001) were positively correlated with FMD%, whereas PD duration (γ = -0.351, P = 0.003), high-sensitivity C-reactive protein (p = -0.345, P = 0.003), pulse pressure (γ = -0.341, P = 0.003), and age (γ = -0.403, P @@<@@ 0.001) were inversely correlated with FMD%. In contrast, there was no correlation between peritoneal Kt/V urea and FMD%. In multivariate linear regression analysis adjusted for these factors, residual GFR was found to be an independent determinant of FMD% (β = 0.317, P = 0.017). </P><B>♦ Conclusion</B><P> This study shows that RRF is independently associated with endothelial dysfunction in ESRD patients on PD, suggesting that RRF may contribute to endothelial protection in these patients. </P>
심승철(Seung Cheol Shim),전재범(Jae Bum Jun),정성수(Sung Soo Jung),이인홍(In Hong Lee),배상철(Sang Cheol Bae),유대현(Dae Hyun Yoo),김성윤(Seong Yoon Kim),정화순(Wha Soon Chung),정낙은(Nak Eun Chung) 대한내과학회 1994 대한내과학회지 Vol.47 No.6
N/A Objectives : Anemia is the most common extra-articular manifestation of rheumatoid arthritis (RA). However neither the frequency of anemia in the patients of RA nor the role of erythroid abnormalities in various types of anemia have been reported previously in Korean population. Methods : To establish the frequency of anemia and the role of erythropoietin in the pathophysiology of anemia, 500 patients with RA were selected randomly from the patients who were diagnosed at Rheumatism center of Hanyang university hospital from January 1993. Results : 1) In the series of 500 RA patients, 196 patients (39.2%) had anemia, and 127 of 196 patients with anemia had mild anemia (Hb more than 10.0 g/dl), the other 69 patients (35%) had moderate to severe anemia. 2) 92 (77.3%) of 120 patients with anemia had anemia of chronic disease (ACD) and iron deficiency anemia (IDA) was observed in 26 patients (22.7%). Other types of anemia were also found: one case had vitamin B12 deficiency anemia, the other case had autoimmune hemolytic anemia. 3) 17 patients with ferritin between 20~100 ng/ml were examined bone marrow aspiration and biopsy. The results of bone marrow biopsy were identical with that of Iron index (=-0.00446×TIBC+1.22765×Log ferritin-0.07824) except one case, 4) ACD had higher value of Ritchie index, ESR, functional class than IDA (p<0.01), Serum iron had no significant differences between ACD and IDA, but TIBC and ferritin had significant differences between two groups (p<0.01). 5) Ritchie index versus Hb (r=-0.38. p<0.01)'and ESR versus Hb (r=-0.53, p<0.01) were negatively related but there were no significant differences in disease duration. 6) Serum erythropoietin was 17.27±1.3 mu/ml in ACD and 35.64±1.7 mu/ml in IDA, and there were significant differences between these two groups (p<0.01). Conclusions : Iron index is a useful method for differential diagnosis between ACD and IDA. In ACD, erythropoietin may be effective in rheumatoid arthritis with moderate to severe anemia.