하모니 검색 알고리즘을 이용한 포트홀 발생 개수 예측 모형

김도완,이상염,김동호,Kim, Dowan,Lee, Sangyum,Kim, Dongho 한국건설관리학회 2014 한국건설관리학회 논문집 Vol.15 No.4

최근 급격한 기후 변화에 관련하여 아스팔트 도로의 손상이 다발적으로 발생하고 있다. 이러한 현상을 해결 및 방지하기 위해서 세계 각국에서 다양한 연구를 수행하고 있다. 이와 관련하여, 본 연구에서는 서울시에서 발생하는 포트홀 수에 대한 예측모형을 개발하였다. 예측모델을 개발함과 동시에 다양한 독립변수 중 실제 포트홀 발생에 영향을 미치는 요소를 파악하기 위해 경험적인 방법과 통계적인 방법을 활용하였다. 예측모형은 BHS (Basic Harmony Search) 알고리즘을 이용하여 결정하였으며, 기후자료와 교통량 자료 및 포트홀 발생 자료를 기반으로 예측이 이루어진다. 하모니 검색 알고리즘을 이용하여 예측모델을 결정하는 과정에서 PAR(Pitch Adjusting Rate)과 HMCR(Harmony Memory Considering Rate)의 영향을 파악하기 위해 이 값을 변화시키며 적합성을 판단하였다. 예측모델은 Training Data(2011년, 2012년 및 2013년 자료)로 인해 구성되며, 결정된 모델의 적합성을 판단하기 위해 Testing Set에 적용하도록 하였다. 기본적인 예측모델의 적합성 판단은 RMSE(Root Mean Squared Error), MAE(Mean Absolute Error), 결정계수(Coefficient of Determination)를 이용하도록 하였다. A bunch of asphalt roads have been damaged frequently in relation to the rapid climate change. To solve and prevent this type of problems, many nationalities in the world have performed various researches. In this regard, the objective of this study is to develop prediction model as to the number of potholes occurred in seoul. At the same time, we have utilized empirical and statistical approaches in order for us to identify factors which is affecting the actual occurrence. The predictive model was determinded by using BHS (Basic Harmony Search) algorithm. Prediction was based on the weather and traffic data as well as data occurrence data of porthole. To assess the influences which are PAR(Pitch Adjusting Rate) and HMCR(Harmony Memory Considering Rate), we determined suitability by changing the values. In the process of the determining a predictive model, the predictive model composed Training data (2011, 2012 and 2013yrs data). To determine the suitability of the model, we have utilized Testing Set (2009 and 2010 yrs data). The suitability of the basic prediction model has been from RMSE(Root Mean Squared Error), MAE(Mean Absolute Error) and Coefficient of determination.

기준금리 변동에 따른 은행과 저축은행의 예대마진 전략

김도완,Kim, Dowan 한국데이터전략학회 2022 Journal of information technology applications & m Vol.29 No.2

This research confirmed whether banks and saving banks increase their deposit margin under changes in the base rate. This paper has conclusions as follows. First, when the Bank of Korea changes the base rate, deposit rate variable are significant with panel analysis in the total data set and saving banks. This result implies that changes in the base rate affect deposit margin. Second, this study confirmed whether banks and saving banks maximize their deposit margin as base rate changes. As a result, when the Bank of Korea cut the base rate, the deposit margins of banks and saving banks decreased significantly. Still, their deposit margins are not statistically significant in the opposite situation. Therefore, this paper could not find evidence that banks and saving banks behave to maximize their deposit margin. Maybe, this phenomenon can appear because these financial institutions recognize this criticism.

한국형 도로포장 설계 프로그램의 소석회 사용 아스팔트 혼합물 특성 적용

김도완,이상염,문성호,Kim, Dowan,Lee, Sangyum,Mun, Sungho 한국도로학회 2015 한국도로학회논문집 Vol.17 No.4

PURPOSES : The hydrated lime-modified asphalt, which improves moisture resistance, is normally used for pavements to reduce the number of potholes. However, the method of applying the material properties of the lime-modified asphalt mixture for use in pavements is not covered in the Korean Pavement Research Program (KPRP). The objective of this research is to find a method for the design application of lime-modified asphalt's material properties to the KPRP. METHODS: The section for test design is selected in some conditions which are related to the level of design regarding Annual Average Daily Traffic (AADT). To define the application methods of hydrated lime in the KPRP, the models of fatigue, rut and international roughness index (IRI) are determined based on the M-EPDG test results from some earlier research results. Moreover, it is well known that dynamic moduli of the unmodified mixture are not different from those of the lime-modified mixture. RESULTS: The performance results of hydrated lime-modified asphalt pavement were not very much different from those of the unmodified pavement, which meant the limited design regulations regarding fatigue failure, rutting deformation and IRI. CONCLUSIONS: The KPRP uses the weather model from the data for previous 10 years. It implies that the KPRP cannot predict abnormal climate changes accurately. Hence, the predictive weather data regarding the abnormal climate changes are unreliable. Secondly, the KPRP cannot apply the moisture resistance of asphalt mixtures. Therefore, a second level of design study will have to be performed to reflect the influence of moisture. It means that the influence on pavement performance can be changed by the application of hydrated lime in asphalt mixture design.

비파괴 충격파 시험을 통한 소석회 첨가 투수성 가열 아스팔트 혼합물의 수분민감성 평가

김도완,문성호,Kim, Dowan,Mun, Sungho 한국도로학회 2015 한국도로학회논문집 Vol.17 No.4

PURPOSES: It is theoretically well known all over the world, that porous hot mixed asphalt (HMA) with hydrated Lime improves moisture and rutting resistance, and reduces pothole occurrence frequency, as well as the life cycle cost (LCC). METHODS : Addictive in the two different formations of the liquid anti-stripping Agent and powder Hydrated-Lime was applied in this investigation in order to obtain relatively clear results according to their types and conditions. Firstly, the moisture conditions were set, and applied to the porous HMA mixtures with hydrated lime (anti-stripping agent). Next, it was followed by a non-destructive test with the application of three freeze-thaw cycles, which were individually carried out thrice to compare the results of the dynamic moduli. Lastly, the hydrated lime effect related to moisture sensibility to porous HMA has been verified through the analysis of the modulus results regarding the change rate of dynamic modulus per n-cycle. RESULTS: It is clear from this investigation, that the dynamic modulus is inversely proportional to the change in temperature, as the graph representing the rigidity of the thermorheologically simple (TRS) material showed gradual decline of the dynamic modulus with the increase in temperature. CONCLUSIONS: The porous HMA mixture with the anti-stripping agent (hydrated Lime) has been found to be more moisture resistant to freezing and thawing than the normal porous HMA mixture. It is clear that the hydrated lime helps the HMA mixture to improve its fatigue resistance.

10KW급 저온수성가스 반응기 특성에 대한 연구

김도완(Dowan Kim),주현철(Hyunchul Ju),김재동(Jeadong Kim),김봉규(Bongkyu Kim),김진욱(Jinwook Kim),손성효(Seunghyo Son),박상현(Sanghyon Park),박달영(Dalyung Park) 한국신재생에너지학회 2014 한국신재생에너지학회 학술대회논문집 Vol.2014 No.11

현대제 170kV GIS DS 조작 Mechanism부 부분방전 발생에 따른 내부점검

김영수(Youngsoo Kim),문병선(Byongseon Moon),김도완(Dowan Kim),한철인(Chulin Han),김대현(Daehyun Kim),김유진(Youjin Kim),김진호(Jinho Kim),이건주(Keonjoo Lee),백동순(Dongsoon Baek),김덕기(Deokgee Kim) 대한전기학회 2022 대한전기학회 학술대회 논문집 Vol.2022 No.7

배기가스 저감을 위한 경로안내시스템의 연료소모 예측 알고리즘 구현에 관한 방법적 연구

김도완(Dowan Kim),윤주웅(Joowung Yoon),김광연(Kwangyoen Kim),김대광(Daekwang Kim),박심수(Simsoo Park) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5

Recently, the main ingredient of the greenhouse gas, CO2 and the fuel consumption rate is raised on an international problem, so the motor manufacturers are concentrated to develop the techniques about it. The techniques and fuel efficiency improvement are developed for the direct method such as the improvement of engine and the advice device of improving the driving habit. In this study the fuel consumption about the various routes that customers grasp the traffic to the destination before the driving was forecasted and the algorithm for the best route was developed. The energy efficiency map and the fuel consumption production in this algorithm are the very core. The prospect accuracy of the algorithm is confirmed by the driving test and it is confirmed that the driving route information system realizing this algorithm improves the fuel efficiency.

유동성 공급자와 KOSPI200 ETF의 가격오차 현상

김도완(Dowan Kim) 한국증권학회 2018 한국증권학회지 Vol.47 No.4

본 연구에서는 ETF(Exchange Traded Fund)라고 알려진 상장지수펀드의 시장가격과 ETF의 순자산가치인 NAV(Net Asset Value)의 차이를 비율로 계산해 ETF 시장가격이 NAV보다 저평가 혹은 고평가 되어 있는지를 확인 해보고 그 원인에 대해 분석하였다. 그 결과 세 가지 결론을 도출하였다. 첫째, ETF 시장가격은 NAV 자체를 비교했을 때 저평가 되어 있었다. 둘째, ETF 시장가격에 분배금을 고려하고 NAV에 펀드보수와 매도거래세라는 세금요소를 반영했을 때 실질적으로 고평가 되어 있었다. 셋째, 이렇게 분배금, 펀드보수, 매도거래세금을 고려한 경우 나타나는 ETF 시장가격의 고평가 현상에 대해 변동성 변수와 유동성 변수를 세분화하여 원인을 분석하였다. 그 결과 변동성 변수와 유동성 공급자 관련 변수가 유의하게 나타났는데 그 중에서 유동성 공급자의 유의성이 더 높았으며 유동성 공급자 중에서 매도 유동성이 매수 유동성 보다 높은 유의성을 가졌다. 따라서 유동성 공급자가 ETF를 실질적으로 높은 가격대에 거래를 형성하고 있어 이들의 역할에 따라 ETF의 가격오차 현상에 영향이 있음을 확인했다. 따라서 ETF 유동성 공급자에 대한 평가가 지금보다 조금 더 구체적으로 제시할 필요가 있음을 시사한다. This paper confirmed effect factors according to pricing errors between ETF (Exchange Traded Fund) and NAV (Net Asset Value). This paper reached the following three conclusions. First, when compared to NAV, ETF was undervalued. Second, ETF was overvalued if dividends, fund fees, and tax variables were considered, meaning that the price of ETF was higher than that of NAV. Third, volatility and LP (Liquidity Provider) variables can be effect factors in overvaluation of ETF. In particular, the seller in LP variables is a stronger factor than other variables. This means than an LP can set a high price for an ETF and is able to influence pricing error. Therefore, detailed evaluation of the LP should be conducted.

다수 대함유도탄에 대한 함정의 대공방어유도탄 운용기법 연구

김도완(Dowan Kim),윤중섭(Joongsup Yun),유창경(Chang-Kyung Ryoo) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.4

본 연구에서는 단일 함정에 대해 근접방어용 대공방어유도탄을 이용한 대함유도탄 방어 기법 로직을 제안한다. 방어함정은 레이더 정보를 이용해 대함유도탄 궤적을 예측하고, 예측된 궤적을 바탕으로 방어 기법 로직에 의해 교전 계획을 수립한다. 방어 기법 로직은 최대한 많은 수의 대함유도탄을 함정으로부터 최대한 먼 곳에서 요격하는 로직으로 이전 발사가 요격에 실패했을 경우에 대비하기 위함이다. 방어유도탄의 할당에 관한 결정은 통합 격추 확률과 예상 요격 지점 비교를 통해 이루어진다. 제안한 로직의 성능은 비선형 2차원 평면 시뮬레이션을 통해 검증하였다. In this paper, an efficient defense strategy of single naval ship using short range anti-air missiles against the threat of multiple anti-ship missiles is suggested. The defense logic is based on the estimated future trajectory of anti-ship missiles by using current radar information. The logic is designed to maximize the range of interception of anti-ship missiles so that the chance of interception can be increased although the prior tries turn out to be fail. Basically, the decision making for the allocation of a defense missile is achieved by comparing the total kill probability and the estimated intercepting point. Performance of the proposed logic is investigated by nonlinear planar numerical simulations.

업종별 자원효율성 분석 및 개선방안

김도완(Dowan Kim),이종수(Jongsoo Lee),배재근(Chaegun Phae) 한국환경정책학회 2020 環境政策 Vol.28 No.1