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OPNET을 이용한 블루투스를 위한 Koinonia 적응형 계층 시뮬레이터 설계
양만석(Man seok Yang),홍진표(Jin pyo Hong),고재진(Jae jin Ko),민수영(Soo young Min) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅲ
본 논문에서는 무선 근거리 네트워크 (Wireless Personal Area Network : WPAN) 환경에서 Koinonia 라는 새로운 시스템을 제안하고 링크계층에 적응형 계층을 추가하여 구성 및 모델링 함으로써 2.4GHz의 ISM 무선 대역을 이용하여 근거리에 위치한 무선 기기들을 연결하고 음성정보 및 데이타를 전송하는 근거리 무선 네트워크 시스템의 시뮬레이터를 구현 함을 목적으로 하였다.
접시형 고온 태양열 화학 반응기의 열전달 및 수소생산 성능 분석
양승복(Seung-Bok Yang),고만석(Man-Seok Ko),오상준(Sang-June Oh),서태범(Tae-Beom Seo) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The purpose of this research is to develop the high performance of solar chemical reactor for producing hydrogen by methane reforming reaction with steam. Two shape of chemical reactor is suggested: first type is filled with porous material and second type is spiral type. These reactors is installed on the dish-type thermal system of Inha University, Inha Dish-1. Performance analysis of these two reactors is conducted from getting methane conversion.
블록 경계 영역 특성을 이용한 블록 부호화 영상에서의 양자화 잡음 제거
권기구,양만석,마진석,임성호,임동선,Kwon Kee-Koo,Yang Man-Seok,Ma Jin-Suk,Im Sung-Ho,Lim Dong-Sun 한국정보처리학회 2005 정보처리학회논문지B Vol.12 No.3
본 논문에서는 블록 기반으로 부호화된 영상에 대하여 블록 경계 영역 특성에 따른 적응적 필터링을 이용한 양자화 잡음 제거 알고리즘을 제안하였다 제안한 방법에서는 블록 경계에 인접한 네 개 화소들의 통계적 특성을 이용하여 각 블록 경계 영역을 평탄 부영역(smooth sub-region)과 복잡 부영역(complex sub-region)으로 분류한 후, 인접 블록간 영역 특성을 이용하여 서로 다른 블록간 필터링을 수행한다. 먼저 인접 블록 모두 평탄 부영역인 경우에는 평탄 블록 경계 영역 중 블록화 현상이 발생하지 않은 영역도 존재하기 때문에 계산량을 줄이기 위하여 평탄 영역 중 블록화 현상이 발생한 영역만을 검출하여 필터링을 수행한다. 그리고, 두 부영역이 서로 다른 부영역인 경우에 대하여서는 기존의 방법들과는 달리 실제 에지 성분을 보존하면서 블록화 현상과 에지 주위에서 발생하는 링잉 현상을 동시에 제거하기 위하여 인접 블록의 영역 특성에 따라 적응적으로 일차원 필터링을 수행한다. 두 부영역이 모두 복잡 부영역일 경우에는 블록화 현상을 제거하면서 실제 에지를 보존하기 위하여 블록화 강도 및 양자화 파라미터에 따라 블록 경계 영역의 두 화소에 대하여 필터링을 수행한다. 모의실험 결과를 통하여 제안한 방법이 객관적 화질 및 주관적 화질 측면에서 기존의 방법보다 그 성능이 우수함을 확인하였다. In this paper, we propose a novel post-filtering algorithm with low computational complexity that improves the visual quality of decoded images using block boundary classification and simple adaptive filter (SAF). At first, each block boundary is classified into smooth or complex sub-region. And for smooth-smooth sub-regions, the existence of blocking artifacts is determined using blocky strength. And simple adaptive filtering is processed in each block boundary area. The proposed method processes adaptively, that is, a nonlinear 1-D 8-tap filter is applied to smooth-smooth sub-regions with blocking artifacts, and for smooth-complex or complex-smooth sub-regions, a nonlinear 1-D variant filter is applied to block boundary pixels so as to reduce the blocking and ringing artifacts. And for complex-complex sub-regions, a nonlinear 1-D 2-tap filter is only applied to adjust two block boundary pixels so as to preserve the image details. Experimental results show that the proposed algorithm produced better results than those of conventional algorithms both subjective and objective viewpoints.
조성락(Sung Rag Cho),나산균(San Gyun Rha),문성수(Seong Soo Moon),한규호(Kyu Ho Han),박인철(In Cheol Park),김순관(Soon Kwan Kim),양만석(Man Seok Yang),허갑도(Gap Do Hur),최태룡(Tae Lyong Choi) 대한소화기학회 1991 대한소화기학회지 Vol.23 No.1
Unilobular atrophy or hypoplasia involving the hepatic lobes is not uncommon on the left side. It is distinctly uncommon on the right, where it probably represents an developmental anomaly if no other etiological factor is demonstrable. So we report a case of hypoplasia of right hepatic lobe.
조성락(Sung Rag Cho),김주호(Ju Ho Kim),한규호(Kyu Ho Han),박인철(In Cheol Park),김순관(Soon Kwan Kim),양만석(Man Seok Yang),허갑도(Gap Do Hur),최환주(Hwan Joo Choi),지정희(Jung Hee Ji) 대한소화기학회 1989 대한소화기학회지 Vol.21 No.3
This paper describes a unique case of concurrent malignant lymphoma of the colon and small intestine. Primary gastrointestinal lymphoma primarily confined to gastrointestinal tract is relatively rare disease, and the concurrent lymphoma of colon and small bowel is very rare in reported cases. We experienced of malignant lymphoma of entire ileum and colon, especially cecum. Ileum was widely involved, and colonic lumen was stricture and mucosal fold was destructed by polypoid mass and ulceration. He was expired due to ileal perforation. We report this case with a review of the literature.
연속파형 Doppler 법에 의한 폐동맥압의 비관혈적 계측
차광수(Kwang Soo Cha),전국진(Kook Jin Chun),신지애(Ji Ae Shin),이동일(Dong Il Lee),이정유(Jung Yoo Lee),이종수(Jong Soo Lee),신영우(Yung Woo Shin),신영기(Yeong Kee Shin),양만석(Man Seok Yang),권형각(Hyong Gak Kwon) 대한내과학회 1991 대한내과학회지 Vol.41 No.5
In order to assess the possibility of noninvasive estimation of pulmonary artery pressure by Doppler echocardiography, pulmonary artery pressures estimated by continuous wave Doppler echocardiography were compared with those measured by cardiac cath-eterization in 10 patients with tricuspid and pulmonary regurgitation. Doppler-determined pressure gradients were estimated from the tricuspid and pulmonary regurgitant flow velocity(V) by means of the simplified Bernoulli equation(ΔP =4v²). The results were as follows: Pressure gradients (PGs) between right ventricle and right atrium at systole measured by Doppler method and catheterization were 58.05±11.67, 59.12±13.78 mmHg, respectively, and correlated well with each other (r=0.95, p<0.01). As for pulmonary arterial systolic pressure (PASP), PGs added by assumed (5 mmHg) right atrial pressure (RAP) and by actual RAP, and catheter-measured PASP were 63.05±11.67, 63.93±11.59, 66.30±12.26mmHg, respectively, and PGs added by assumed RAP and by actual RAP correlated well with catheter-measured PASP, respectively (r=0.97, p<0.01; r=0.98, p<0.01). The PGs between pulmonary artery and right ventricle at end-diastole measured by Doppler method and catheterization were 20.48±4.35, 20.90±4.87, respectively, and correlated well with each other (r=0.97, p<0.01). As for pulmonary arterial diastolic pressure (PADP), the PGs added by assumed (5 mmHg) right ventricular end-diastolic pressure (RVEDP) and by actual RVEDP, and catheter-measured PADP were 25. 48±4.35, 26.38±4.04, 26.80±4.40mmHg, respectively, and PGs added by assumed RVEDP and by actual RVEDP correlated well with catheter-measured PADP, respectively (r=0.96, p<0.01; r=0.96, p<0.01). Doppler-determined PG between the pulmonary artery and right ventricle at early diastole and catheter-measured mean pulmonary arterial pressure were 37.30±6.31, 40.30±5.53mmHg, and correlated well with each other (r=0.81, p<0.01). In conclusion, pulmonary arterial systolic, diastolic pressure and mean pulmonary arterial pressure could be well predicted noninvasively by continuous wave Doppler echocardiography in patients with tricuspid and pulmonary regurgitation,