신증후출혈열에 의한 신자연파열

전상준,소영석,노준,김철성,장대수 조선대학교 부설 의학연구소 2002 The Medical Journal of Chosun University Vol.27 No.1

Spontaneous renal rupture is relatively rare. It is usually associated with benign and malignant renal tumors, vascular diseases and inflammatory disorders. however, a few patients in whom there is no apparent underlying disease are described. Recently we experienced a case of spontaneous renal rupture secondary to HFRS (Hemorrhagic Fever with Renal Syndrom) and report with a brief literature review.

우측 사골동 및 비강에 발생한 골성 섬유종의 내시경하 절제술 1예

최영철,전은주,박용수,김춘일 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.11

태양열 집열기용 평판 히이트파이프의 전열예측

박춘근,전철호,장영석 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2

The purpose of the research is to study the prediction of heat transfer on flat heat pipe applid to solar energy collector by the numerical study. Numerical analysis was performed by finite element method for the prediction of heat transfer on flat transfer on flat heat pipe. A comparison between the experimental and the numerical results show qualitatively agreement and it was able to predict the performence of flat heat pipe collector. The Biot number, (h_(ev)l)/Ks in order to know the effect of heat transfer on flat heat pipe was show to decrease by increas of heat transfer coefficient in vapor region, and with higher conductivity of container, Ks.

正方形 DUCT內 亂流流動의 熱傳達에 관한 硏究

朴春根,全哲昊,徐海成 동아대학교 공과대학 부설 한국자원개발연구소 1983 硏究報告 Vol.7 No.2

A numeical and experimental study has been performed on heat transfer in square duct. The effects of distant P between dry solides and Reynolds number were studied numerically by Finite Element Method(F.E.M.) The experiment were studied according to F.E.M. analysis by Universal Digital Measuring system. The results of F.E.M. analysis and experimental are as follows. 1) Comparison between mumerical and experimental results showed good agreement. 2) Heat transfer increases according to decrease of the P/D ratio and increase of H/L ratio too.

스키시즌권 구매자들의 스키장별 선호도 조사

장현철,김경식,방준현,최천진,엄정식,김응준,이루지 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.2

The purpose of this study was to examine the perception and preference of skiers in a bid to provide ski resorts with useful information about successful positioning strategy. The subjects in this study were 9,722 skiers who purchased season tickets from N web site that sold ski season tickets. Their online purchasing route and page view were analyzed to find out what factors affected their purchase of ski season tickets. The findings of this study were as follows: First, 78 percent of the people investigated were make, and 22 percent were female. By age, the largest group was in their 20s(5,344 skiers), followed by those in their 30s(3,434), those in their 40s(631) and teenagers(229). Second, their page view rate with Yangji recorded highest with 24%, followed by Sungwoo Resort with 23% and Chonmasan with 13 percent. Third, by geographic area, the skiers from southern Gyeonggi province bought the largest number of tickets for the 2002/2003 season, followed by Gangweon province residents and northem Gyeonggi province dwellers. In the case of the 2003/2004 season, those from Gangweon provinece pruchased the most tickets, followed by southern Gyeonggi province dwellers and north Gyeonggi province residents.

廢CRT의 再活用 工程에서 발생한 슬러지로부터 Y의 회수

田埈美,李在天,鄭鎭己,金南澈 공주대학교 자원재활용 신소재 연구센터 2002 센터사업 성과집 Vol.- No.1

폐CRT의 재활용 공정에서 Panel 유리에 도포 된 형광체의 제거 시 발생하는 슬러지로부터 Y를 회수하는 연구를 수행하였다. HCl 및 NHO_3을 사용하여 Y를 침출하였으며 산 농도, 침출온도, 침출시간, 광액농도가 침출율에 미치는 영향을 조사하였다. 또한 침출액으로부터 Y와 Pb를 침전 법으로 회수하는 실험을 행하였다. 슬러지로부터 HCl 및 HNO_3에 의한 Y의 침출거동은 유사한 경향을 나타내었다. 광액농도를 280 g/L로 하여 90℃에서 3.0M HCl 및 HNO_3으로 침출 하였을 때 시간에 따라 Y의 침출율은 증가하다가 40분 이상에서는 각각 93%, 90%로 일정한 침출율을 나타내었다. 침출액에 H_2C_2O_4을 첨가하여 Y를 회수하였으며 Pb는 Na_2SO_4를 가하여 PbSO_4로 제거하였다. A study on the recovery of yttrium was conducted using the phosphor sludges generated in the recycling process of obsolete CRTs. Yttrium was leached by HCl and HNO_2. The leaching efficiency of yttrium was extensively investigated in terms of acid concentration, leaching temperature and time, and pulp density. Yttrium and lead was recovered from leaching solutions also by precipitation method. The leaching behavior of yttrium was similar in both acids. The leaching efficiency of yttrium for both acids increased with time at the conditions of 3.0M, 90℃, and 280 g/L of pulp density. After 40 minutes, it was saturated to 93% and 90% for HCl and HNO_3, respectively. Yttrium was recovered from leaching acid solution by the addition of H_2C_2O_4 while lead was removed as PbSO_4 by Na_2SO_4.

內部熱源을 갖는 直方體의 傳熱特性에 관한 硏究

朴春根,全哲昊,徐海成 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.2

A numerical and experimental study have been performed on the heat transfer in rectangular solid owned heat source. The effects of thermal conductivity k, heat transfer coefficient h, temperature of surrounding fluid To and the rate of heat flow Q were studied numerically by F. E. M. The experiment were studied by given rectangular solid. The results of F. E. M. and experimental are as follows. 1) The F. E. M. to calculate the temperature distribution in rectangular solid showed good agreement with experimental. 2) Thermal conductivity influenced strongly temperature distribution in the solid but heat transfer cofficient influenced only surface. 3) Temperature gradient in the solid was unconcerned by temperature of surrounding fluid and rate of heat flow but temperature in the solid changed at a fixed rate.

노인외상환자의 예후 인자

문철규,전정민,최성혁,문준동,이성우,홍윤식 大韓應急醫學會 1999 대한응급의학회지 Vol.10 No.2

Background: It has been documented that certain prognostic factors may affect the outcomes of the old aged victims by trauma. Considering that trauma is the sixth most common cause of death in people over the age of 65 years and there is a rapid growth of elderly population, it is paramount to understand the prognostic factors when dealing with geriatric trauma patients. Hypothesis and Goals: It can be hypothesized that the prognostic factors should be determined independently between populations being consisted of different races, countries, socio-economic states, cultures, or so on. Thus, the study was designed to evaluate the factors affecting the outcomes of elderly Korean trauma patients. Methods: One hundred forty six patients aged over 65 years were retrospectively reviewed, who visited the Emergency Center of Korea University from January, 1997 to June, 1998. Of 146 patients, 7 were excluded due to discharge against advice or transfer to the other hospitals. Parameters analyzed were age, sex, mechanism of injuries, body region injured, Injury Severity Score (ISS), previous medical illness, hospital morbidity, duration of hospital stay, and cost. Each patient was classified into improved or not-improved group depending on the outcomes, and young-old or old-old group depending on the age. The factors affecting the hospital stay in improved patients were analyzed in the parameters of previous medical illness, hospital morbidity, multiple injuries, ISS, and age. All statistical tests were conducted with two-tailed levels of 0.05. Results: Of 139 patients, the mean age was 74±7.1 years, mean ISS 9.3±7.26, mean hospital stay 27±27.1 days. Most commonly injured body region was the extremities due to fall from a level surface. Rate of previous illness showed 0.94 medical diseases per person and were aggravated after trauma in 39 patients (60.9%). Hospital morbidity rate was 0.46 incidents per person. There were no differences in age and duration of hospital stay between the improved and the not-improved group. Substantial differences were noted in affected body region, incidence of previous illness, and hospital morbidity between the groups (p=NS). Not-improved group had higher ISS(p<0.05). ISS, previous illness and hospital morbidity affected the duration of hospital stay in the improved group. Hospital stay was 40±25.1 days in patients with ISS over 6 while 6±8.6 days in those with ISS 5(p<0.05). Hospital stay in the improved was 26±26.9 days while 31±24.8 days in the improved old-old group (p=NS). Hospital stay in the young-old minor trauma (ISS5) patients with previous illness and hospital morbidity was 26±10.1 days while 4±7.3 days in those without previous illness and hospital morbidity (p<0.05). Conclusion: Previous medical illness and hospital morbidity, not age, are predictive of outcomes of geriatric trauma patients with respect to hospital stay. As most of the hospital morbidity was a trauma-induced aggravation of previous medical illness and hospital morbidity contributing poor outcomes can be potentially avoidable, routine aggressive care for the geriatric trauma patients with previous medical illnesses is needed.

複合 作動液을 갖는 回轉型 히트파이프의 傳熱特性

박춘근,전철호,서해성 동아대학교 공과대학 부설 한국자원개발연구소 1991 硏究報告 Vol.15 No.1

Heat transfer characteristics of internally triangler finned rotating heat pipe with the water-ethanol mixture as working fluid have been numerically and experimentally studied. The numerical and experimental results showed good agreement and when the ethanol content change, application limit of rotating heat pipe could change. By increasing rpm or vapour pressure of rotating heat pipe, heat transfer rate was increased slightly but when ethanol content increase, heat transfer rate was decreased. In case of pure ethanol for working fluid, heat transfer was about 0.8 compared with distilled water. When ethanol content was about 0.2 heat transfer rate and applicable temperature was profitably appeared. When ethanol content was about 0.2, heat transfer rate and applicable temperature difference of rotating heat pipe.

KSDeN^TM process의 영양염류 제거 특성

김도군,천상욱,김병군,서인석,박철휘,김성준,류수현 대한상하수도학회 2002 상하수도학회지 Vol.16 No.4

Intermittent aeration processes have been much of interest as an excellent alternative for nutrients removal for upgrading secondary wastewater treatment plants, with minimum modification. Also, operational flexibility of those proposes a good opportunity for newly planed plants. Here, a pilot study was conducted to evaluate the performance of a continuous flow intermittent aeration process (KSDeN^TM process). The influent was collected at the effluent channel of the grit chamber of a large sewage treatment plant. The influent characteristics with standard deviation were 243.2±170.9mg/L for TCOD_cr, 47.5 13.9mg/L for T-N, 8.4±8.3mg/L for T-P and 5.2±1.8 for C/N ratio. Effluent of 1^st sedimentation tank was 208.2±87.6mg/L for TCOD_cr, 35.0±10.3mg/L for T-N, 4.8±1.9mg/L for T-P and 6.1±2.3 for C/N ratio. The average removal efficiencies of TCOD_cr, T-N and T-P were 93.6, 77.0 and 86.4% and effluent TCOD_cr, T-N and T-P concentrations were 12.5, 9.2 and 0.7mg/L respectively, satisfying regulatory limits. Alkalinity deficiency was not observed during the oxic periods, which is one of the special features of an intermittent aeration process. The results showed higher COD, T-N and T-P removal efficiencies and stability with varying influent conditions, compared to other conventional fixed phase nutrients removal processes.