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Al 6061 합금 양극산화피막의 성장과 부식특성에 미치는 혼합 전해용액의 영향
류한웅,김용환,정우창,정원섭,Ryu, Han-Woong,Kim, Yong-Hwan,Chung, Uoo-Chang,Chung, Won-Sub 한국재료학회 2007 한국재료학회지 Vol.17 No.5
The properties of anodized films on aluminum 6061 alloy in single electrolyte of sulfuric acid and mixed electrolyte of sulfuric-boric acid and sulfuric-boric-nitric acid have been studied. Polarization tests in NaC solution were used to investigate the corrosion performance. Characteristics of film formation and surface morphology were examined by optical microscopy, FE-SEM and EDS. The results obtained have indicated that oxide films growth have been promoted by nitric acid and anodized films in mixed electrolyte have superior corrosion resistance. In case of anodic films formed in mixed electrolyte, some grooves and numerous crazings were also observed at the surface.
머신 러닝 기법을 활용한 메타버스 렌터카 가격 예측 방법의 디자인
양지석,류한웅,이지운,이지홍,박철수 한국방송∙미디어공학회 2024 방송공학회논문지 Vol.29 No.1
This paper proposes a method that utilizes machine learning techniques to predict rental car prices in the metaverse. Theprimary objective of this paper is to predict rental car prices in a metaverse environment. To achieve this goal, we introduce aprediction a method based on actual data provided by KAFLIX. Three experiments were conducted in total, employing variousmachine learning methods including regression analysis and ensemble techniques. The aim was to investigate factors influencingrental car prices, encompassing single-step forecasting, multi-step forecasting, and multi-step forecasting with application of BOHB,an optimization algorithm, to enhance the accuracy of rental car price predictions. As a result of the experiment, it was concludedthat the previous rental car price and date information play crucial roles in predicting rental car prices. Simultaneously, theeffectiveness of utilizing this information for rental car price prediction was demonstrated. In the event that the rental car businessin the metaverse undergoes a development similar to that in reality, our research results are anticipated to offer valuable insightsinto the rental car industry within this enviornment.