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유원상(Won Sang Yoo),우상준(Sang Joon Woo),성영주(Yong Joo Seong),김준희(Joon Hee Kim),최석구(Suck Koo Choi),전영빈(Young Bin Jeon) 대한내과학회 1991 대한내과학회지 Vol.41 No.2
N/A Thirty four patients with essential hypertension, who could successfully discontinued antihypertensive drug treatment, were analyzed to find out the clinical indices which can be used for the prediction of success and duration of the drug withdrawal. The resnets were as follows: 1) The shorter the time for the normalization of blood pressure after drug administration, the longer the duration of drug withdrawal and the lower the rate of remedication. 2) The duration of withdrawal was inversely proportional to the level of pretreatment mean arterial pressure, the duration from the beginning of drug administration to the withdrawal, and the duration from the time when the blood pressure was normalized to the time when the antihypertensive medicines were withdrawn. 3) There was no correlation between the existence of cardiac complications of hypertension and the duration of successful withdrawal. 4) The rate of remedication of antihypertensive medicines among the patients who had stopped taking the medicines was 53%. In conclusion, among the hypertensive patients, if a persons blood pressure could be normalized within 3 months after the beginning of medication, he would be a good candidate for drug withdrawal. In other cases, if the dosages of antihypertensive medicines could be tapered off at the sixth month and taking the medicines could be stopped at the 12-18th month, the duration of drug withdrawal could be 9-18 months.
유원상 ( Won Sang Yoo ),김남희 ( Nam Hee Kim ),강민호 ( Min Ho Kang ),윤세영 ( Se Young Yun ),김석배 ( Suk Bae Kim ),신정은 ( Jung Eun Shin ),박윤찬 ( Yun Chan Park ),송일한 ( Il Han Song ) 대한소화기학회 2008 대한소화기학회지 Vol.51 No.6
Spontaneous intrahepatic bleeding is a rare condition. In the absence of trauma, intrahepatic hematoma may be due to underlying liver disease. We report a case of hepatocellular carcinoma in the patient who had huge intrahepatic hematoma without definite intrahepatic tumor at the time of initial presentation. A 54-year-old man was admitted to our hospital with a sudden onset of upper abdominal pain. Initial abdominal CT scan showed huge hematoma measuring more than 13 cm in diameter in the right lobe of the liver. However, there was no enhancing lesion in the liver. Laboratory data showed high alanine aminotransferase, alpha-fetoprotein and positive HBsAg. The MRI and angiography could not also depict any mass in the liver. The patient was treated with percutaneous drainage on the intrahepatic hematoma. The cytology from drainaged blood revealed no malignant cell. After hematoma decreased, follow-up CT scan depicted an enhancing tumor in the liver. He underwent right hepatic lobectomy and histopathological examination showed hepatocellular carcinoma. (Korean J astroenterol 2008;51:385-390)
유원상(Won-Sang Yoo),강보식(Bo-Sik Kang),장지성(Ji-Seong Jang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this study, a position control algorithm being applied to a pneumatic artificial muscle driving apparatus is proposed. The position control algorithm is composed of a feedback controller and a feedforward controller. The feedback controller which feeds back position, velocity and acceleration is derived from the linear model of pneumatic artificial muscle driving apparatus. The feedforward controller is designed to improve position trajectory tracking performance. The effectiveness of the designed controller is proved by experimental results.
고혈압 환자의 순응도에 관한 연구 - 의사 개입의 성과 -
유원상(Won Sang Yoo),최석구(Suck Koo Choi),이건주(Kun Joo Rhee),이광재(Kwang Jae Yi),노승현(Seung Hyun Noh) 대한내과학회 1989 대한내과학회지 Vol.36 No.2
N/A Compliances of one hundred patients with essential hypertension treated with usual care were compared with those of another one hundred hypertensives with intervention care simply provided by the physician in charge. The results were as follows: 1) The cumulative dropout rate in the usual care group decreased by 9%, 15% and 13% in 6, 9 and 12 months respectively. 2) The intervention care involved a shorter waiting time, longer consultation time, supportive care with sympathy, educational booklets and positive follow-up by telephone and mails. 3) In the intervention care group 56% of the dropouts were because of the provider, 27% were due to the patient and 17% were because of socioeconomic ceasons. In conclusion, patient compliance will certainly be improved by positive intervention by the physician in charge, escalation of medical insurance and the personal efforts of the patient.