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서광휘(Kwang Hee Seo),정혜경(Hye Kyeong Chung),김명곤(Myeong Gon Kim),정덕수(Duck Soo Chung),성낙관(Nak Kwan Sung),김옥동(Ok Dong Kim) 대한핵의학회 1993 핵의학 분자영상 Vol.27 No.1
N/A Retrospective analysis of cholescintigraphy and ultrasonography was done in 76 patients with clinically suspected acute cholecystitis to assess the relative value of the two modalities. Excluding the patients with obstructive jaundice, the overall results of cholescintigraphy(sensitivity 100%, spectificity 95%, false positive rate 5%, false negative rate 0%, accuracy 97%) are nearly identical with or rather superior to those of the ultrasonography(sensitivity 94%, specificity 100%, false positive rate 0%, false negative rate 5%, accuracy 97%). We recommend the cholescintigraphy as the initial modality in patients with clincally suspected acute cholecystitis, and ultrasonography can be used in jaundiced patients to exclude the possibility of the false positive of cholescintigraphy.
최재호(Jae-Ho CHOI),김광용(Kwang-Yong Kim),정덕수(Duck-Soo CHUNG) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
A computational code has been developed to design an automotive cooling fan by the numerical optimization techniques coupled with a three-dimensional Navier-Stokes solver. The conjugate gradient method and the golden section method are used to determine the search direction and the step size along the direction, respectively. Concerning the constraints, exterior penalty functions are employed. The numerical optimization techniques developed obtains the final shape after sixth changes of the shape function, which gives the maximum object function defined as the increase in the pressure coefficient.
任孝宰,鄭德秀,李錫鎬 湖西大學校工業技術硏究所 1999 工業技術硏究所論文集 Vol.18 No.-
This work was conducted to study the distribution of velocity field in the inlet region of evaporator for automobile HVAC(Heating, Ventilation, and Air Conditioning). By experimental and numerical simulation method, we found out that the installation position of evaporator in cool air blowing system had optimal value. Also, the porous media assumption of evaporator in computational domain assured to valid when compared with experimental results. Finally, the diffusing scroll which proved to be very efficient and silent by experimentally.
제2형 당뇨병에서 대혈관합병증 유무에 따른 경동맥 내막-중막 두께와 죽상동맥경화증 위험인자에 대한 연구
윤현대,진명인,유성수,정덕수,이지현,손호상 대한당뇨병학회 2002 임상당뇨병 Vol.3 No.4
연구배경: 당뇨병 환자에서 대혈관합병증을 조기에 발견하여 진단을 내리는 데에는 어려움이 많은데 최근 고해상도 B-mode 초음파를 이용한 경동맥의 내막-중막 두께의 측정은 조기에 죽상동맥경화증의 정도를 반영하는데 매우 유용함이 알려져 있다. 이에 저자들은 제2형 당뇨병 환자에서 대혈관합병증의 예측에 경동맥 내막-중막 두께의 유용성을 분석하고 경동맥 내막-중막두께와 죽상동맥경화증 위험 인자와의 연관성을 알아보기 위하여 연구를 시행하였다. 방법: 본 연구는 대구가톨릭대학병원에서 추적, 경과관찰 중인 103명의 제2형 당뇨병 환자를 대상으로 대혈관합병증 (관상동맥질환, 뇌혈관질환) 의 기왕력이 있는 군과 기왕력이 없는 군으로 나누어 시행하였다. 고해상도 B-mode 초음파기기를 이용하여 경동맥 내막-중막 두께를 측정하였으며, 문진, 이학적 검사 등을 시행하여 키, 체중, 당뇨병의 유병기간, 흡연 및 고혈압의 기왕력에 대한 정보를 얻었다. 10∼12시간 금식후 정맥에서 혈액을 채취하여 지질성분 (중성지방, 총콜레스테롤, HDL-콜레스테롤, LDL-콜레스테롤, Lp(a), Apo(A), Apo(B)), 당화혈색소를 측정하고 24시간 요중 알부민과 단백질을 측정하였다. 결과: 대혈관합병증이 있는 군에서 연령, 혈압, 당화혈색소가 더 높았으며 당뇨병성 신증이 의미있게 증가되어 있었다. 또한 대혈관합병증이 있는 군에서 경동맥 내막-중막 두께의 최고치 및 평균치가 의미있게 증가되어 있었으며 경동맥 내막-중막 두께의 최고치는 대혈관합병증의 독립적인 위험인자로 분석되었다. 경동맥 내막중막의 두께와 관련된 위험인자로는 연령, 당뇨병의 이환기간, 수축기혈압, LDL-콜레스테롤이 유의한 상관관계를 보였다. 결론: 당뇨병성 대혈관합병증의 조기발견에 있어서 고해상도 B-mode 초음파로 측정한 경동맥 내막-중막 두께의 측정은 유용하며, 특히 연령이 많고, 당뇨병의 이환기간이 오래 되거나, 고혈압이나 고지혈증이 동반된 환자일수록 더욱 도움이 될 것으로 생각된다. Background: Macrovascular complications such as cardiovascular and cerebrovascular accidents are major causes of diabetes mellitus-related morbidity and mortality. However, it is difficult to diagnose such macrovascular complications before clinical symptoms are evident. In many previous studies, the measurement of carotid intima-media thickness (IMT) has been a useful, non-invasive method to detect early atherosclerotic vascular changes. Methods: We measured carotid IMT by using high resolution B-mode ultrasonography in 103 type 2 diabetes patients with and without macrovascular complications. At the same time, we analyzed the patients' characteristics including height, weight, body mass index (BMI), blood pressure, duration of diabetes, and past history of hypertension and smoking. Laboratory parameters such as HbA1c, triglyceride, total cholesterol, LDL-cholesterol, HDL-cholesterol, apolipoprotein (A), apolipoprotein (B), Lp (a) and 24-hour urine microalbumin and protein were included in this study. Results: Age, blood pressure, glycosylated hemoglobin and diabetic nephropathy were significantly increased in type 2 diabetes patients with macrovascular complications. And type 2 diabetes patients with macrovascular complications showed significantly thicker maximal and mean carotid IMT than those without macrovascular complications. Maximal carotid IMT was an independent risk factor of macrovascular complication in type 2 diabetes patients, and was positively correlated with age, duration of diabetes, systolic blood pressure and LDL-cholesterol. Conclusion: The measurement of carotid IMT by using high resolution B-mode ultrasonography is a useful method for the early detection of macrovascular complications in type 2 diabetes patients.
원발성 하지 정맥류의 성공적 치료를 위한 Duplex Scan의 역할
박성환,박기호,박기혁,이한일,주대현,정덕수,유용운,석상보 대한혈관외과학회 1999 Vascular Specialist International Vol.15 No.2
Purpose: Anatomy and morphology of superficial veins vary from patient to patient. Thorough assessment of variations is mandatory for successful treatment of primary varicose vein. Alos in complex case clinical examination alone is unable to achieve diagnostic goals. Duplex scan is a highly accurate, noninvasive technique that can provide both anatomic and physiologic information. Methods: Thirty-eight legs in 30 patients with primary varicose veins were examined clinically first then with portable doppler. Patients then underwent duplex scanning by surgical team and results of tests were compared with other clinical examinations. Results: On duplex scanning, 25 legs (66%) had saphenofemoral junction (SFJ) incompetence, 9 legs (24%) had saphenopopliteal junction (SPJ) incompetence and 4 legs (10%) had perforator incompetence. The respective sensitivity of clinical examination with portable doppler in SFJ, SPJ was 91.6%, 81.8%. Conclusion: Clinical and doppler assessment was unreliable. Routine preoperative duplex scanning is likely to reduce recurrence by identifying sites of reflux with greater accuracy.