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동축류 제트에서 전기장에 의한 화염 안정성 증진에 대한 실험적 연구
원상희(Sang Hee Won),류승관(Seung Kwan Ryu),정석호(Suk Ho Chung),차민석(Min Suk Cha) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
The enhancement of flame stability in coflow jets has been investigated experimentally by observing the liftoff behaviors of nonpremixed propane and methane flames in the electric fields. The liftoff or blowoff velocities has been measured in terms of the applied AC voltages and frequency. The experimental results showed that the liftoff velocity could be extended significantly just by applying the high voltage to the central fuel nozzle both for propane and methane. AC increasing the applied voltage, the liftoff velocity increases almost linearly with the applied voltage and have its maximum value at certain applied voltage. After that, the liftoff velocity showed decrease with the applied voltage. Through the experimental observation, we found that the liftoff velocity could be correlated well with the applied voltage and frequency in the linearly increasing regime. And after having maximum in the liftoff velocity, it was observed that the liftoff velocity decreases with the applied voltage irrespective of AC frequencies. To visualize the change of flame structure with electric fields, planar laser induced fluorescence technique was adopted, and the enhancement of flame stability has been explained based on the flame structural change in electric fields.
현진해(Jin Hai Hyun),안태훈(Tae Hoon Ahn),류승관(Seung Kwan Ryu),김종웅(Jong Woong Kim),강동훈(Dong Hoon Kang) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.3
The possibility of colon cancer generating on the mucosa affected with tuberculosis has been suggested, althongh the pathogenesis of colon cancer is known to be different from that of tubercu- lous colitis. %Ve report a very rare and interesting case of colon cancer associated with tubercu]ous colitis that is considered by colonofiberscopy and postoperative specimen.
미분탄 순산소 버너의 화염 안정성 파악을 위한 실험적 연구
최종균(Chong-Gun Choi),나익환(Ik-Hwan Na),채태영(Tae Young Chae),류태우(Tae-U Yu),양원(Won Yang),강태석(Tae Seok Kang),김태형(Tae Hyung Kim),서상일(Sangil Seo),류승관(Seung Kwan Ryu) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Oxy-coal combustion is one of the key technologies for CO2 capture in coal power plants. In this study, flame stability of an oxy-puverized coal flame was investigated in two burners: a 300 ㎾ pulverized coal burner in KITECH and a 1 ㎿MW pulverized coal burner in KEPRI. Flame attachment characteristics were observed visually for air and oxy-fuel conditions, and effect of various ratios of primary and secondary oxidants was also investigated. We found that the operating conditions of oxy-PC flame should be determined more carefully than those of air-PC flame, observing characteristics of the flame attachment in various conditions. Based on the information, stable flame could be achieved for various oxygen concentrations in the oxdizer stream. However, more investigation should be performed for design of a real-scale oxy-PC burner.
류승관,현진해 대한내과학회 1990 대한내과학회지 Vol.38 No.4
Colon cleansing regimens alter the colonoscopic and histologic appearances of the human colon mucosa. To determine whether colon-cleansing methods change the colon mucosa, 94 normal subjects were studied prospectively from January. 1989 to March 1989, and the following manipulations of six different regimens were assessed at random: Normal saline 1.5 liter enema, more than four times, 14 cases; oral castor oil 100㏄ and normal saline 1.5 liter enema, 19 cases; oral castor oil 100㏄ and soapsuds 1.5 liter enema, 14 cases; oral magnesium cirtate 250㏄ and normal saline 1.5 liter enema, 16 cases; oral magnesium citrate 250㏄ and soapsuds 1.5 liter enema, 14 cases; and oral Golytely 4 liter, 125㏄ each five minutes, 17 cases. The colonoscopic musosal change rates caused by colon-cleansing regimens were as follows: Normal saline enema 0%, oral Golytely 0%, oral castor oil and normal saline enema 63.2%, oral castor and soapsuds enema 85.7%, oral Mg citrate and normal saline enema 18.7% and oral Mg citrate and soapsuds enema 85.7%. The histologic appearances of the colon mucosa after normal saline enema and oral castor were no different from those seen in humans without enema. The histologic changes after colon-cleansing regimens took place occurred mostly in the epithelial surface compartment, the lamina propria compartment and goblet cells. Oral caster made more histologic changes of the colon mucosa than those seen in oral Mg citrate, and there were more histologic changes in the soapsuds enema than in the normal saline enema. Therefore, the colonoscopic and histologic interpretations of colon mucosa in inflammatory colonic diseases need further information about colon-cleansing methods.
한국형 출혈열 환자에서 혈장 Catecholamine의 변화
정동국,최태승,김용섭,류승관,조원용,김형규,원동준 대한내과학회 1990 대한내과학회지 Vol.38 No.1
To evaluate the relationship between plasma catecholamines and the pathogenesis of acute renal failure(AFR), the plasma NE, E, Dopamine, DOPA and DOPAC were measured in 13 cases of Korean hemorrhagic fever(KHF) with renal failure and 12 normal persons as a control group by HPLC with ECD. To correlate these values with other renal functions, the blood pressure(systolic and diastolic), pulse rate, serum creatinine and creatinine clearance were measured. The results were failure as follows: 1) In 13 cases of KHF with renal failure, the plasma NE was increased in the oliguric and diuretic phases compared with the control group(p<0.05). The plasma E was also increased in the diuretic phase(p<0.05). 2) In the follow-up 7 cases, plasma E and NE were decreased in the diuretic phase(p<0.05). 3) The plasma E had a positive correlation with plasma Cr in the oliguric phase and a negative correlation with plasma Cr in the diuretic phase. The plasma NE had a positive correlation with plasma Cr in the diuretic phase. From these results, the increased synthesis of catecholamines is considered to be one of the pathogenic factors in KHF with acute renal failure. And the renal response to changes of catecholamines may be different with each phase in Korean hemorrhagic fever.
김연수,안태훈,최동섭,류승관 대한내분비학회 1988 Endocrinology and metabolism Vol.3 No.1
Patients with pure gonadal dysgenesis are phenotypic females with 46XX karyotype who have rudimentary streak gonads and remain sexually infantile, but are of normal or tall stature and lacking somatic stigmata of Turner's syndrome. We report a case of pure gonadal dysgenesis with sensorineural hearing difficulty, sporadic type.