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1시간 호우피해 규모 예측을 위한 AI 기반의 1ST-모형 개발
이준학,이하늘,강나래,황석환,김형수,김수전,Lee, Joonhak,Lee, Haneul,Kang, Narae,Hwang, Seokhwan,Kim, Hung Soo,Kim, Soojun 한국수자원학회 2023 한국수자원학회논문집 Vol.56 No.5
In order to reduce disaster damage by localized heavy rains, floods, and urban inundation, it is important to know in advance whether natural disasters occur. Currently, heavy rain watch and heavy rain warning by the criteria of the Korea Meteorological Administration are being issued in Korea. However, since this one criterion is applied to the whole country, we can not clearly recognize heavy rain damage for a specific region in advance. Therefore, in this paper, we tried to reset the current criteria for a special weather report which considers the regional characteristics and to predict the damage caused by rainfall after 1 hour. The study area was selected as Gyeonggi-province, where has more frequent heavy rain damage than other regions. Then, the rainfall inducing disaster or hazard-triggering rainfall was set by utilizing hourly rainfall and heavy rain damage data, considering the local characteristics. The heavy rain damage prediction model was developed by a decision tree model and a random forest model, which are machine learning technique and by rainfall inducing disaster and rainfall data. In addition, long short-term memory and deep neural network models were used for predicting rainfall after 1 hour. The predicted rainfall by a developed prediction model was applied to the trained classification model and we predicted whether the rain damage after 1 hour will be occurred or not and we called this as 1ST-Model. The 1ST-Model can be used for preventing and preparing heavy rain disaster and it is judged to be of great contribution in reducing damage caused by heavy rain.
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화학적 침출법을 통한 표면 다공성 Al-Cu-Si 공정 합금 제조
이준학,김정태,임수현,박혜진,신호정,박규현,김기범,Lee, Joonhak,Kim, Jungtae,Im, Soohyun,Park, Hyejin,Shin, Hojung,Park, Kyuhyun,Qian, M.,Kim, Kibeum 한국재료학회 2013 한국재료학회지 Vol.23 No.4
Al-based alloys have recently attracted considerable interest as structural materials and light weight materials due to their excellent physical and mechanical properties. For the investigation of the potential of Al-based alloys, a surface porous $Al_{88}Cu_6Si_6$ eutectic alloy has been fabricated through a chemical leaching process. The formation and microstructure of the surface porous $Al_{88}Cu_6Si_6$ eutectic alloy have been investigated using X-ray diffraction and scanning electron microscopy. The $Al_{88}Cu_6Si_6$ eutectic alloy is composed of an ${\alpha}$-Al dendrite phase and a single eutectic phase of $Al_2Cu$ and ${\alpha}$-Al. We intended to remove only the ${\alpha}$-Al phase and then the $Al_2Cu$ phase would form a porous structure on the surface with open pores. Both acidic and alkaline aqueous chemical solutions were used with various concentrations to modify the influence on the microstructure and the overall chemical reaction was carried out for 24 hr. A homogeneous open porous structure on the surface was revealed via selective chemical leaching with a $H_2SO_4$ solution. Only the ${\alpha}$-Al phase was successfully leached while the morphology of the $Al_2Cu$ phase was maintained. The pore size was in a range of $1{\sim}5{\mu}m$ and the dealloying depth was nearly $3{\mu}m$. However, under an alkaline NaOH, aqueous solution, an inhomogeneous porous structure on the surface was formed with a 5 wt% NaOH solution and the morphology of the $Al_2Cu$ phase was not preserved. In addition, the sample that was leached by using a 7 wt% NaOH solution crumbled. Al extracted from the Al2Cu phase as ${\alpha}$-Al phase was dealloyed, and increasing concentration of NaOH strongly influenced the morphology of the $Al_2Cu$ phase and sample statement.
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부분부하시 하이칸공조기에 의한 일반건물의 합리적 습도제어
홍경수(Kyoungsu Hong),박성찬(Sungchan Park),이준학(Joonhak Lee),금종수(그림),박진석(Jinseok Park),박승상(Seungsang Park),이수양(Sooyang Lee) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
The mechanical dehumidifying process needs a lot of energy to maintain the constant indoor humidity at the partial load condition. The HyKhan air handling unit applies the hybrid dehumidification system to reuse the condenser waste heat. So, the HyKahn air handling unit can save about 30% of chilled water and 65% of power consumption, comparing with the mechanical dehumidification system.
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