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Acetic acid수용액을 포함한 4성분계의 액-액평형
장윤식(Jang Yoon Sik),박동원(Park Dong Won) 동아대학교 해양자원연구소 1999 동아대학교 해양자원연구소 연구논문집 Vol.12 No.-
25℃에서 Acetic acid-water-binary solvent를 포함한 4성분 액-액추출계의 상평형에 대하여 연구하였다. methyl iso-butyl ketone(MIBK)-ethyl acetate을 혼합용매로 사용하였으며, 수용액으로부터 Acetic acid을 추출함에 있어서 혼합용매 사용의 효과를 고찰하기 위하여 각 4성분계에 대한 용해도곡선, tie-line, 분배도와 선택도를 측정하였다. 또한 실험에 의한 상평형 데이터를 UNIFAC 모델식으로 부터 계산된 값들과 비교하였으며, 4성분계 액-액평형에 대한 UNIFAC 모델의 적용 가능성을 확인하였다. We studied on the phase equilibria of quaternary liquid-liquid extraction system containing Acetic acid-water-binary solvent at 25℃. MIBK- ethyl acetate were used as binary solvents. Binodal curve, tie-line, distribution and selectivity for each quaternary system have been determined in order to investigate the effect of using binary solvent in extracting Acetic acid from aqueous solution.<BR> And these experimental equilibrium data were also compared with the values predicted by UNIFAC model. UNIFAC model was successfully used to predict quaternary liquid-liquid equilibria.
무선 센서 네트워크의 에너지 효율성을 고려한 MP-DD 라우팅 알고리즘
장윤식(Yoon-Sik Jang),박남규(Nam-Kyu Park),오충식(Chung-Sik Oh),최승권(Seung-Kwon Choi),이창조(Chang-Jo Lee),조용환(Yong-Hwan Cho) 한국컴퓨터정보학회 2009 韓國컴퓨터情報學會論文誌 Vol.14 No.7
본 논문의 무선 센서네트워크에서 사용할 수 있는 효율적인 라우팅 방법인 MP-DD (MultiPath-Direct Diffusion) 알고리즘을 제안한다. 기존의 DD(Directed Diffusion)에서는 하나의 경로만을 강화하여 사용하는 것과 달리 제안한 알고리즘은 다중 경로를 강화하면서, 해당 경로에 높여 있는 센서 노드의 남은 에너지 등급을 고려하여 에너지 레벨이 높은 경로에 따라 가중치를 부여하고, 몇 개의 다중경로를 이용하여 사용함으로써 에너지 소모를 감소시키고 동시에 네트워크에 전체적으로 에너지를 골고루 사용하게 할 수 있다. 시뮬레이션 결과에서는 이러한 센서 네트워크를 위한 단순한 라우팅 방법의 가능성을 증명하였다. This paper proposes efficient routing scheme named MP-DD(MultiPath-Direct Diffusion) which is simple enough to be applicable to the wireless sensor networks. Conventional DD uses only one optimal path, therefore it consumes more energy of specific nodes. MP-DD uses multiple path and has a information of hop upstream node in the direction of the base-station is determined which are obtainable via the process of self-organization of the network. Simulation results show the feasibility of the simple routing schemes for the sensor networks.
이승헌(Seoung Hun Lee),윤형규(Hyung Gue Yoon),송윤상(Yoon Sang Song),최문영(Moon Young Choi),김석은(Seok Eun Kim),박인석(In Seok Park),장윤식(Yoon Sik Chang),방병기(Byung Kee Bang) 대한내과학회 1994 대한내과학회지 Vol.46 No.1
Background: The Captopril test (Muller, 1986) appears to represent a simple and useful screening tool in the diagnosis of renovascular hypertension. The limitations of the sennsitivity, specificity have been reported under certain circumstances. We performed this study to evaluate the sensitivity, specificity and predictive value of the Captopril test in the diagnosis of renovascular hypertension. Methods: We calculated the sensitivity, specicity and predictive value of the Captopril test in 26patients with clinical suspicion of renovasculr hypertension. We performed the Captopril test and renal angiography in these patients. Results; 1) The Captopril test was positive in 8 patients (30.7%), in whom 26renovascular hypertension were suspected. 2) The mean value of basal and stimulated plasma renin activity were 4.55±1.74ng/ml/hr and 19.89±7.19ng/ml/hr respectively, in 8patients with positive Captopril test. The mean value of percent increase of stimulated PRA was 384±227.9% in these patients. 3) The mean value of basal and stimulated plasma renin activity were 7.27±5.29ng/hr and 8. 78±5.89ng/ ml/hr respectively, in patients with negative Captopril test. The mean value of percent increase of stimulated PRA was 34.61±30.56% in these patients. 4) In patients with postivie Captopril test, there were 4true positive (50%) and 4false positive (50%) by renal angiography. In 18patients with negative Captopril test, there was 1false negative who had abnormal angiography. 5) The sensitivity, specificity and predictive value of the Captopril test were 80%, 81% and 50% respectively. Conclusion: The Captopril test seems to have limitations of sensitivity, specificity and predictive value in the diagnosis of renovascular hypertension. The careful clinical clinical application of Captopril test and renal angiography should be considered in the diagnosis of renovascular hypertension.
신이식환자에서 B 형 및 C 형 간염의 유병율과 임상경과
양철우(Chul Woo Yang),신영신(Young Shin Sin),윤선애(Sun Ae Yoon),진동찬(Dong Chang Jin),안석주(Suk Joo Ahn),김용수(Yong Soo Kim),최의진(Euy Jin Choi),장윤식(Yoon Sik Chang),윤영석(Young Suk Yoon),방병기(Byung Kee Bang) 대한내과학회 1994 대한내과학회지 Vol.47 No.5
Objectives: To evaluate the prevalence and clinical course of HBsAg positive and anti-HCV positive renal transplant recipients. Methods: According to serologic result, we divided the patients into HBsAg positive (HBV) and anti-HCV positive (HCV) group, and evaluated the clinical course based on duration and severity of hepatic dysfunction. Mean duration of observation was 3.8 years. Results: 1) HBsAg positivity was 11.3% and anti-HCV positivity was 13.3%, respectively. Before transplantation, in HBV group, HBsAg positivity was observed in 83.5% before renal transplantation, and 16.5% patients acquired HBsAg after renal transplantation, In HCV group, anti-HCV positivity was observed 54% before transplantation and 19.6% acquired anti-HCV after renal ransplantation. 2) The prevalence of chronic hpatitis in HBV and HCV grup was not different (25.7% vs. 25.5%). Among those with chronic hepatitis in HBV group, four cases progressed to fulminant hepatic failure, one case progressed end-stage of liver cirrhosis and one case progressed to hepatocelluar carcinoma. However, in HCV group, no case showed progression of chronic hepatitis. 3) Overall mortality of HBV and HCV group 25.3% and 7.8%, respectively (p=0.001): Among twenty fatal cases in HBV group 9 cases were liver disease-related but no liver disease-related death was observed in HCV group. Conclusion: HCV as well as HBV infection is quite prevalent and implortant cause of posttransplant chronic hepatitis, and clinical course of anti-HCV-posi- tive recipients are less aggressive than HBsAg positive recipients.
최승권,장윤식,지홍일,신승수,조용환,Choi Seung kwon,Jang Yoon sik,Ji Hong il,Shin Seung soo,Cho Yong hwan 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.4A
무선 PKI에서 OCSP기법은 인증서 폐지·효력 정지 상태 파악을 실시간으로 정확하게 할 수 있는 특성이 있다. 그러나 많은 클라이언트들이 OCSP서버에 인증에 대한 서비스를 요청할 경우 OCSP서버의 부하는 증가하게 되고, 많은 갱신 정보들이 집중화될 때도 OCSP서버는 많은 부하를 갖게 된다. 이에 분산 OCSP서버 기법을 무선PKI에 적용함으로서 빠른 인증서 검증과 OCSP서버로의 트래픽 집중을 막고, 중앙 집중적인 구조의 많은 제약들을 분산된 OCSP서버로 해결하고자 한다. 시뮬레이션 실험 결과 분산 OCSP를 사용한 경우, OCSP 서버의 수가 늘어날 수록 서버의 부하감소와 인증서 검증 요청 평균 응답시간이 단축됨을 확인할 수 있었다. 또한 복수의 OCSP 서버를 제공하여 자원의 분산화가 가능하며 부수적인 효과로 장애에 대한 대비로 이중화 효과를 얻을 수 있었다. OCSP has specific characters which can suspend, close, and correct in real time. But, as more clients use the OCSP server verification, more updated information is needed, which can lead to jamming in the OCSP server. To apply this technique of Distributed OCSP server so as to reduce the certificate verification OCSP from jamming. Also, the Distributed OCSP server will solve the problems of the intensive central structure. Simulation results show that the average reply time of certificate verification request and server load are reduced in the case using distributed OCSP. In addition to this advantage, resource distribution and fault tolerance are acquired because of multiple OCSP.
저구연산뇨증에 의한 신결석과 신석회화증을 동반한 원위세관 산증 1 예
채은영(Eun Young Chae),장윤식(Yoon Sik Chang),신동일(Dong Il Shin),태현정(Hyun Jung Tae),박용범(Yong Bum Park),박선희(Sun Hee Park) 대한신장학회 2002 Kidney Research and Clinical Practice Vol.21 No.3
Renal stone and nephrocalcinosis are common clinical manifestations of type 1 renal tubular acidosis. In normal state, citrate plays the most critical role in suppressing stone formation as it combines with calcium. In type 1 RTA, increased reabsorption of citrate in proximal tubule results in low citrate excretion, which precipitates renal stone formation. We report a case of type 1 RTA accompanying renal stone and nephrocalcinosis caused by hypocitraturia. A 16-year-old male patient who had renal stone and nephrocalcinosis showed hypocitraturia. Incomplete type 1 RTA was proved as the cause of hypocitraturia by bicarbonate and ammonium loading test in the patient.