헬리컬관외 침전 및 적하 열전달 특성에 관한 연구

황승기,윤상국,김동혁,이승갑 韓國海洋大學校 附設 海洋科學技術硏究所 2001 硏究論文集 Vol.10 No.2

An experimental study is carried out to investigate the cahracteristics of heat transfer of outside helical tubes. The main heat exchanger consists of twelve curved columns with each 300mm diameter and the total length of 1.2m copper tube having an outer diameter of 19.05mm with 1.5mm thickness. Water flows down the outside of helical tube, where flow patterns are the vertical film falling flow, immerged flow, and mixed-flow which is the combination of film falling flow and immerged flow. Refrigerant 11 flows the inside of the tub countercurrently. The experimental range of inside flow rate is 1.7∼3.2ℓ/min. The results are presented as Nusselt number with corresponding Reynolds number for variety of outside and inside flow rates. The heat transfer rates of the mixed flow are 8 to 56% higher than those of film falling flow or immerged flow only. Interpretation of the results is given on the basis of physical reasoning and the correlation equations.

選好多樣性을 考慮한 버스 서비스 評價模型에 關한 硏究

김갑수,권대우,김상황 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.2

In order to overcome the weakness of previous studies an the average-based customer satisfaction, bus service evaluation technique was proposed in this study. A perceived service(i.e. perception of service quality, mobility, transfer and economy) and stated preference survey were conducted to investigate passenger’ consciousness toward bus service. The analysis results from study are as follows; The likelihood ratio of evaluation model for bus service established in mixed multinomial logit model is 0.259 and the hit ratio is 62.1 %. It was found that the ratio is far better than the model established by multinomial logit model. Standard deviations of some variables like accessing time, travel time, comfort of driving, information sign, 1ow floor bus and standing-bus have significant level of 5 %, which indicates the reflection of user' heterogeneity.

大邱市 버스專用車路의 輸送效率에 關한 硏究

김갑수,김상황,전종훈 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.2

The purpose of this study is to evaluate an efficiency through of the analysis level of service and travel speed of exclusive bus lane in Deagu Metropolitan. The analysis results from study are as follows. First, it is revealed bus lane section that suitable to a bus traffic volume standard of establishment did not have an one place over a 100vph. Such result are analyzed by a standard of establishment absence to the bus lane to take the traffic characteristic(road condition, bus traffic volume, bus user) of the area into the account. Second, average travel speed(26.6km/h) of bus lane is fast the 1.2km than bus average travel speed(25.4km/h) of common section and it is fast the 1.5km/h than car average travel speed(25.1km/h). Third, transportation efficiency of bus is analyzed 20 times of personal car and number of average borader of bus is appeared 28.1person/vehicle and personal car is 1.4person/vehicle. Forth, level of service of street is appeared to 'E, F' all sections except that relatively Taepyengro, Bongdeogro, Susengro is small traffic volume and Dalgubeoldaero is big road capacity.

大都市 駐車供給 實態分析과 駐車空間 確保方案에 關한 硏究 : 大邱市를 中心으로

김갑수,김상황 嶺南大學校 工業技術硏究所 2004 工業技術硏究所論文集 Vol.32 No.1

Motor vehicles along with the means of public transportation play an important role in helping the urban life and economic activities. Since the parking place can smooth the utilization of vehicles indirectly, they are important urban facilities. Therefore, the unbalance between parking demand and supply results in social problem affecting not only motor vehicle traffic but also entire urban activities. The purpose of this study is to suggest actual alternatives for the parking policy to solve the parking problems in daegu metropolitan. In order to achieve this purpose, analyze parking supply state and examine the cause of the parking demand. In order to solve the parking problems in the daegu, we should design the basic plan of parking place and parking policy balancing parking demand and supply that harmonized with the master plan of daegu metropolitan.

Paraquat 중독환자의 초기검사로서 sodium dithionite를 이용한 소변내 paraquat검출의 임상적 의의

윤갑준,임경수,이진웅,김영식,이부수,박덕우,김선만,이강현,황성오,안무업 대한응급의학회 1995 대한응급의학회지 Vol.6 No.1

Background : Mortality from paraquat intoxication depends upon plasma paraquat concentration. To know the severity of paraquat intoxication is important for directing therapeutic modality and predicting prognosis. Sodium dithionite test for urinary paraquat provides an easy and simple method to determine the severity of paraquat intoxication in emergency department. purpose : To determine whether the result urinary paraquat test by sodium dithionite can predict outcome in patients with paraquat intoxication in emergency department. Subjects : 48 patients(male 31, female 17, mean age 37 years) who had exposure to paraquat and presented within 24 hours after exposure. Result : Thirty five patients were positive in paraquat urine test and thirteen patients were negative. Clinical manifestations were more severe in positive patients than in negatives. Complication was much more in positives than in negatives. 28 of 35 patients(80%) in positives and 2 of 13 patients(15%) in negatives died. Conclusion : Positive test for urinary paraquat is associated with high mortality and morbidity from paraquat intoxication, and qualitative test for urinary paraquat by sodium dithionite is an useful method to determine the severity of paraquat intoxication in emergency department.

두개안면 섬유성 이형성증의 임상적 고찰

백롱민,오갑성,윤성호,백세민,황민호 大韓成形外科學會 1994 Archives of Plastic Surgery Vol.21 No.3

Fibrous dysplasia is a benign pathologic condition of bone and causes facial deformities as well as functional problems. We have managed 32 craniofacial fibrous dysplasia form March 1989 to December 1993. The most common age distribution of surgery was second decade(34%) and third decade(53%). In our patients, the desease process usually begins in childhood and progresses throughout puberty and adolescence. Treatment was aimed at preventing and correcting functional problems and achieving normal facial aesthetics. The reconstruction with other combined surgery, i.e., mandibular and maxillary osteotomies, reduction malar plasty, malar augmentation and orbit, nasal reconstruction with bone graft. Postoperative results were satisfactory in most cases. In some patients, repeated contouring(16%) surgery might produce less morbidity than a single massive resection. In evaluating the extent of the lesion, computerized tomography prooved to be a good diagnostic tool. Aethetically and functionally satisfactory surgical results were achieved by bone shaving in combination with reconstructive surgery.

축구선수의 Detraining과 Retraining이 혈청지질 및 호르몬농도에 미치는 영향

정정화,박재현,채종훈,성혜련,황지인,윤미숙,노금선,윤종관,윤영학,노순덕,정경숙,박일규,김은희,박현태,박상갑 대한스포츠의학회 1999 대한스포츠의학회지 Vol.17 No.1

The purpose of this study was to investigate the effects of detraining and retraining on serum lipid and hormones in soccer players. Subjects were seven male high-school soccer players. V˙O_2max was determined for each subjects by administering a treadmill test(initial speed: 90m/min, grade: 5%, increasing speed per 3 min: 30m/min). Serum lipid(T-C, TG, HDL-C LDL-C) and hormones(epinephrine, norepinephrine, growth hormones, cortisol) were assayed pre and post detraining in 10, 20, 30 days after retraining. The repeated ANOVA was used to determine significant differences. The 0.05 level of significance was as critical level for the study. The results of the study were as follows: 1. V˙O_2max(ml/min) were 3576.3±204.2ml/min pre detraining, 3234.1±198.9 ml/min post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/min) were 3601.4±170.9 ml/min. There were significantly(p<.05) increased in retraining periods. 2. V˙O_2max(ml/kg/min) were significantly(p<.05) decreased from 62.3±2.9 ml/kg/min to 55.9±4.7 ml/kg/min in detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/kg/min) were 62.4±3.4ml/kg/min, 62.7±2.3ml.kg/min, 67.3±7.2ml/kg/min respectively. There were significantly(p<.05) increased in retraining periods. 3. T-C were significantly (p<.05) increased from 166.6±8.5mg/dl to 175.3±10.3 mg/dl in detraining. In 10, 20, 30 days after retraining, T-C were 160.1± 3.2mg/dl, 156.7±3.7mg/dl, 140.3±9.0mg/dl. There were significantly(p<.05) decreased in retraining periods. 4. HDL-C were 61.4±6.6mg/di pre detraining, 5.3±6.6mg/dl post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, HDL-C were 56.9±7.1mg/dl, 56.4±9.2mg/dl, 57.7±9.1mg/dl respectively. There were no significant difference in retraining periods. 5. The hormones(epinephrine. norepinephrine, growth hormone, cortisol) were changed as same patterns. Epinephrine were 26.0±7.0[g/ml pre detraining, 24.6±3.2pg/ml post detraining. In 10, 20, 30 days after retraining, epinephrine were 26.9±5.6pg/ml, 30.6±6.2pg/ml, 29.4±5.6pg/ml respectively. There were no significant difference in retraining periods. In conclusion, HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were decreased, T-C, LDL-C and TG were increased in detraining. But HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were increased, T-C, LDL-C and TG were decreased in retraining.

CROSS 공법을 이용한 폐수의 생물학적 처리에 관한 연구

박광하,심재도,권영두,강동수,김인호,정태명,황갑성 7개 국립대학교 환경연구 논문집 공동발행 위원회 2003 공업기술연구 Vol.3 No.-

This study aims to develop using a continuous removal of organic and settling solid(CROSS) to increase the efficiency of aeration system for wastewater treatment. To solve many problems of the conventional activated-sludge process, authors suggested a new CROSS model in conjunction with aeration systems in 1996. This system is characterized by utilizing an intensive aeration pipe with inlets at the lower portion and outlets at the higher portion in an aeration tank. Through the experiments on CROSS process, the average removal efficiences of BOD, COD_(Mn), SS, T-N and T-P were showed 98.8%, 93.9%, 98.0%, 71.3% and 49.8%. The average DO (Dissolved-Oxygen) concentration was constantly maintained at 8.0 mg/L by the intensive aeration which was accompanied by rapid reduction of BOD. Degradation of the organic matters in sewage then continued for the whole aeration period. The process demonstrated that it was very adaptive without seeding and returning the sludge. Compared to the activated sludge system, the system was very flexible for the continuous flow treatment. This preliminary assessment showed that the porous media in CROSS reactor is viable for the sewage treatment, since the porous media under the intensive aeration achieves acceptable effluent quality.

Ni 촉매를 이용한 CO₂ 개질 반응에 있어 Support의 영향

황갑성(Kap-Sung Hwang),김영환(Young-Hwan Kim) 한국환경관리학회 2001 環境管理學會誌 Vol.7 No.2

메탄에 의한 이산화탄소의 개질에서 Mordenite를 담체로 한 니켈촉매의 전환 특성

황갑성(Kap-Sung Hwang),김영규(Young-Kyu Kim),이동규(Dong-Kyu Lee) 한국환경관리학회 2001 環境管理學會誌 Vol.7 No.2