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요석 환자에 있어서 혈중 및 요중 칼슘과 요산치 변동에 관한 연구
노용수,김홍섭,양상국,안성수 건국대학교 의과학연구소 2002 건국의과학학술지 Vol.12 No.-
Background: Urinary stone is a world-wide disease and it's prevalence is 1-12%. During the past decade, there has been an expanding research activities in the neglected problem of urolithiasis, and there has been considerable progress in physicochemical and physiologic basis for stone formation, development of improved diagnostic criteria, and formation of new regimen for treatment. Urinary stones are mainly composed of calcium and the most common metabolic abnormalities in calcium stone patients are known to be hypercalciuria and uric acid disorder, especially including hyperuricosuria, which is thought to be important factors in the formation of idiopathic calcium urolithiasis. Method: We evaluated the difference of urinary and serum calcium, uric acid levels between 54 patients with urinary stone and 35 patients of control group as 24 hr urinary metabolic study. Results: Serum and urine calcium levels and uric acid levels of stone former patients were significantly higher than those of controls. The prevalence of hypercalciuria was significantly high in stone former patients. Conclusion: We found that the serum and 24-hour urinary levels of calcium and uric acid were clearly influential factor of the stone formation.
가변시간간격을 갖는 Newmark 시간적분법의 사다리꼴법칙에 대한 안정성과 정확도
노용수,정진태,배대성,Noh, Yong-Su,Chung, Jin-Tae,Bae, Dae-Seong 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.10
Stability and accuracy for the trapezoidal rule of the Newmark time integration method are analyzed when variable time step sizes are adopted. A new analytic approach to stability and accuracy analysis is also proposed for time integration methods with variable time step sizes. The trapezoidal rule with variable time step sizes has the "actual" unconditional stability which is the same as that of the method with constant time step sizes. However, the method with variable time step sizes is first-order accurate while the method with constant time step sizes is second-order accurate. accurate.
노용수 건국대학교 의과학연구소 1999 건국의과학학술지 Vol.9 No.-
Many factors have been concerned about spontaneous passage of ureteral stones. Patients of ureteral stone ask to doctor the day of passage of ureteral stone and then doctors cannot suggest satisfiable answer. I investigated the relation between duration and many factors which concerned about spontaneous passed out ureteral stones. One hundred fifty cases of spontaneous passed out ureteral stones were evaluated during 5 years between October, 1993 and October, 1998. We investigated relation between duration of spontaneous passage and size, position, shape, margin, density, IVP findings of ureteral stones. The size and position influenced the duration of spontaneous passage of ureteral stones and other factors showed no significant difference. Small size in same position and low position in same size of ureteral stones were passed out spontaneously more early. Average duration of spontaneous passed out ureteral stone was 2.9 days in 2mm, 5.1 days in 3mm, 4.3 days in 4mm, 7.2 days in 5mm and 2.7 days in ureterovesical junction(UVJ), 4.1 days in lower ureter, 7.6 days in upper ureteral stones. This investigation suggested average duration of spontaneous passed out ureteral stones for size and position and also suggested that many other factors showed no difference in spontaneous passage of ureteral stones. With this results, we can suggest relatively accurate duration of spontaneous passge of ureteral stone.
노용수 건국대학교 의과학연구소 1995 건국의과학학술지 Vol.5 No.-
Most foreign bodies in the urinary bladder are self-intorduced through the urethra as a means of masturbation. The author have experienced 4 cases of foreign bodies in the badder which have various purposes of introducting through the urethra. They were 3 in male and 1 in female and they are as follows. Case 1:25-year-old male. A ball pen cap which was tied with two electric wires was introdced into bladder through the urethra by the prostitutes. It was removed out with the foreignbody forcep under the cystoscopy. Case 2:15-year-old girl. A pencil was introduced into the bladder through the urethra by herself from curiosity 3 years before visiting our office and large stone was formed and wrapped the pencil later. It was removed out through the suprapubic cystostomy. Case 3:50-year-old male. 5 magnets were introduced into the bladder by himself for the purpose of forceful penile erection and they were all of a lump and stone was formed between the 5 magnets. They were removed out through the suprapubic cystostomy. Case 4:37-year-old male. 74㎝ in length, 3㎜ in diameter white rubber was introduced into the bladder for the purpose of masterbation. It was removed out with the grasping forcep under the cystoscopy.