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연속식 PCR과 BCR에서 기$cdot$액 접촉 방법 및 주입 오존 유량에 따른 페놀 폐수의 오존 처리특성
김용대,안재동,이준,Kim, Yong-Dai,Ahn, Jae-Dong,Lee, Joon 한국환경보건학회 1996 한국환경보건학회지 Vol.22 No.1
The main objectives of this research program were to study the ozonation characteristics of phenol wastewater in the continuous packed colamn reactor(PCR) and the bubble column reactor (BCR) using ozone and to provide the fundamentals of ozonizing the phenol wastewater. Among various influencing factors that affect on phenol decomposition through the oxidation by ozone, contacting method, and ozone flow rate were chosen as reaction parameters. The results were obtained from two different types of contacting methods where the countercurrent flow was more efficient than the cocurrent flow in both the phenol removal efficiency and the ozone utilization efficiency. Furthermore, PCR showed the phenol removal efficiency 1.6 to 3% higher than that of BCR in both contacting methods, as well as the ozone utilization efficiency, suggesting that the countercurrent flow is more efficient than the cocurrent flow. The phenol removal efficiency and the ozone utilization efficiency were reduced in both reactors as the influent ozone flow rate increased. Upon varing flow rate from 0.5l/min to 2.0 l/min by 0.5 l/min, the phenol removal efficiency was reduced approximately from 8.5% to 10.5% and the ozone utilization efficiency was reduced approximately from 6% to 8% in both reactors. The performance of PCR was superior to that of BCR in the aspects of phenol removal and ozone utilization efficiency.
전처리 오존에 의한 혐기성 소화반응의 효과에 관한 연구
김용대(Yong Dai Kim),안재동(Jae Dong An),박문숙(Moon Sook Park) 한국환경보건학회 1999 한국환경보건학회지 Vol.25 No.1
The characteristics of the ozone-anaerobic treatments of phenol wastewater were studied in a laboratory scale wastewater treatment system. The ozone treatment of wastewater was carried out in a batch-type reactor. The ozonizing time, initial pH of wastewater, volumetric flow rate and ozone concentration of aerating gas were maintained as 140 min, 10, 1.5ℓ/min and 30 mg/ℓ. The anaerobic reactor was maintained at a temperature of 35℃ and a hydraulic retention time of 24 hours. In the ozonation with successive anaerobic degradation, the ozonizing stage gave removal efficiencies of phenol and COD as 77% and 33%, respectively. The overall removal efficiencies of phenol and COD could be obtained over the whole treatment as 97% and 70%, respectively. However, the anaerobic degradation was ineffective and could not be used as an energy source due to producing a small amount of low calorific biogas. The intermediates formed by ozonation of phenol seemed hard to decompose in the anaerobic treatment. In conclusion, the ozonation reactor with successive anaerobic reactor is unsuitable due to losing the advantage of anaerobic treatment that is to obtain the considerable amount of fuel gas.
축차적 반응표면 분석을 통한 M&S 메타모형 구축에 관한 사례 연구
김상익 ( Sang Ik Kim ),김용대 ( Yong Dai Kim ),임용빈 ( Yong Bin Lim ),최기헌 ( Ki Heon Choi ),김정은 ( Jeong Eun Kim ) 한국품질경영학회 2012 품질경영학회지 Vol.40 No.1
In computer simulation models the output from the computer code is often deterministic, i.e., running the code twice with the same values for the input variables would give the same output. It is discussed why the response surface method with polynomial approximation for the true response function is a good approximation to the computer experiments model. A sequential strategy to find the proper reduced quadratic polynomial model is illustrated with a case study in the military war game computer simulation model.
장복현,한재덕,김용대,차영욱,조경록,조태원 ( Bog Hyun Jang,Jae Duc Han,Yong Dai Kim,Young Uk Cha,Kyung Rof Cho,Tae Won Cho ) 충북대학교 산업과학기술연구소 1995 산업과학기술연구 논문집 Vol.9 No.1
Abstract_Roman We implemented a graphic user interface(GUI) which sends and receives data between two pe- rsonal computers through RS-232C. The transmitted data are displayed at the determined loca- tion on the GUI of another computer. There can be many
BRADLEY-TERRY 모형을 이용한 2006 독일 월드컵 예측
김도현,이상인,김용대,Kim, Do-Hyun,Lee, Sang-In,Kim, Yong-Dai 한국통계학회 2007 응용통계연구 Vol.20 No.2
It is our greatest concern of Korean team to enter round of 16. The past football results are the most important data for making a prediction. And we know that the home advantage is also considerable factor and there are many unobservable factors. However, there are few matches between the participants and even not the results for some nations. To overcome this difficulty, we model the network of results and consider other factors. We predict 2006 Germany World Cup results using modified the Bradley-Terry model. 2006년 독일 월드컵 개최전, 2002년 한.일 월드컵에서와 마찬가지로 한국이 16강에 올라 갈 수 있을까 하는 것은 전 국민의 관심사였다. 이러한 의문을 통계적인 관점에서 알아보고자 객관적인 자료만을 가지고, 독일 월드컵을 예측해 보았다. 경기 결과를 예측하는데는 과거 국가 간의 경기결과가 가장 중요한 자료가 되는데, 국가간의 경기수가 매우 적고, 심지어는 2006년 독일 월드컵 본선 진출국 중, 특정 국가간의 전적이 없는 것이 사실이다. 또한 우리가 2002년 월드컵에서 4강 신화를 이루는데는 홈 이점이 작용했다는 사실은 누구도 부인하지 않을 것이며, 기타 다른 요인들이 경기결과에 영향을 미쳤을 것이다. 이러한 점을 반영하여 경기결과를 예측하기 위해서는 전 세계 국가의 경기결과를 하나의 네트워크로 형성하고, 기타 다른 요인들을 고려해야 할 것이다. 우리는 수정된 Bradley-Terry 모형을 가지고 2006년 독일 월드컵 결과를 예측해 보았다.
홍진석(Jin Seok Hong),김용대(Yong Dai Kim),김홍섭(Heung Seib Kim),송진호(Jin Ho Song),오재웅(Jae-Eung Oh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this paper an application of an active muffler system is presented for reducing exhaust noise of a heavy vehicle. For improving the signal-to-noise ratio in the process of estimating the transfer function of a secondary path, the conventional inverse modeling combined with an adaptive line enhancer was used as a control strategy. The passive muffler using a simple expansion element was combined with the active muffler system instead of the conventional passive exhaust system to reduce exhaust noise and flow restriction simultaneously. The test vehicle implemented with the combined muffler system had been driven in a stationary state and run up state respectively. The experimental results showed the reduction effects on exhaust noise at each driving state.<br/>
정병환(Jeong, Byung-Hwan),이광석(Lee, Kwang-Seok),김용대(Kim, Yong-Dai),신채호(Shin, Chae-Ho) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Soybean and rape seed are common feedstocks for biodiesel product ion in USA and Europe, respectively. On the other hand, South Eastern countries like Malaysia and Indonesia have surplus palm crops. However due to substantial amount of saturated fats in palm, the palm biodiesel has poor low temperature properties. To improve the low temperature flow properties as biodiesel, the dependence of the cold filter plugging point (CFPP) on the fatty acid compositions was examined. Two different kinds of biodiesels, palm and soybean biodiesels, were blended with the different volume ratios. And the low temperature flow properties of 0.5%, 1%, and 5% biodiesel in diesel blend fuels was tested. The decrease of CFPP was not observed for BD1 with Palm BD. Also, WDI test didn't exceed in the range of 4oC by the mixing of Palm BD upto 5% in commercial diesels.
김용대,최대우 한국지능정보시스템학회 2001 지능정보연구 Vol.7 No.1
Tree model is the most popular classification algorithm in data mining due to easy interpretation of the result. In CART(Breiman et al., 1984) and C4.5(Quinlan, 1993) which are representative of tree algorithms, the split for classification proceeds to attain the homogeneous terminal nodes with respect to the composition of levels in target variable. But, for instance, in the churn prediction modeling for CRM(Customer Relationship management), the rate of churn is generally very low although we are interested in mining the churners. Thus it is difficult to get accurate prediction model using tree model based on the traditional split rule, such as gini or deviance. Buja and Lee(1999) introduced a new split rule, one-sided purity for classifying minor interesting group. In this paper, we compared one-sided purity with traditional split rule, deviance analyzing churning vs. non-churning data of ISP company. Also reviewing the result of tree model based on one-sided purity with some simulated data, we discussed problems and researchable topics.