http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Electrochemical Lithium Recycling System toward Renewable and Sustainable Energy Technologies
Bae, Hyuntae,Hwang, Soo Min,Seo, Inseok,Kim, Youngsik The Electrochemical Society 2016 Journal of the Electrochemical Society Vol.163 No.7
<P>A new system of lithium recycling is designed to recover Li from materials containing waste Li. This waste-to-lithium (WTL) system operates based on electrochemical reaction at room temperature using three functional sections: two cathode compartments, one for the waste materials and one for recycling the recovered Li, and one Li-harvesting anode compartment located between the two cathode compartments. By charging the system, Li ions from waste Li-containing materials are extracted and converted into Li metal in the harvesting anode compartment. The harvested Li metal can be transformed via electrochemical reactions with water into useful Li precursors such as LiOH and Li2CO3, which are commonly used Li source chemicals. The concept of the WTL system is proved using well-known cathode materials from Li ion batteries and a commercial Li ion battery pack as the waste Li-containing materials. The harvested Li metal shows a purity of similar to 99%, and the produced Li2CO3 is phase-pure without any notable secondary phase. Compared to existing Li recycling technologies, which are generally complicated, time-consuming chemical and heating processes, the WTL system is straightforward and can be operated at room temperature without using any deleterious acid chemicals, thus opening a new avenue for cost-effective, eco-friendly Li-recycling systems. (C) 2016 The Electrochemical Society. All rights reserved.</P>
Hybrid seawater desalination-carbon capture using modified seawater battery system
Bae, Hyuntae,Park, Jeong-Sun,Senthilkumar, S.T.,Hwang, Soo Min,Kim, Youngsik Elsevier 2019 Journal of Power Sources Vol.410 No.-
<P><B>Abstract</B></P> <P>The water and carbon cycles are central to the Earth's ecosystem, enabling the sustainable development of human societies. To mitigate the global issues of water shortages and climate change, we report a new electrochemical system that fulfills two functions—seawater desalination and carbon dioxide air-capture—during the charge and discharge processes. The seawater desalination-carbon capture system utilizes a seawater battery platform, consisting of three major compartments (desalination, sodium-collection, and carbon-capture), which are separated by sodium superionic conducting ceramic membranes. It is found that the concentrations of sodium ions and chloride ions in fresh seawater (total dissolved solids ≈ 34,000 ppm) are significantly decreased by the charging of the seawater desalination-carbon capture system, resulting in brackish water (total dissolved solids ≈ 7000 ppm). The discharge process induces the air-capture of ambient carbon dioxide gases through carbonation reactions, which is demonstrated by the carbon dioxide gas removal in this compartment. The hybrid system suggests a new electrochemical approach for both desalination and carbon capture.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A Hybrid-type Seawater Desalination-Carbon Capture system is demonstrated. </LI> <LI> The hybrid system uses NASICON membranes to utilize Na<SUP>+</SUP> ions from seawater. </LI> <LI> Charging of the system can remove Na<SUP>+</SUP> and Cl<SUP>−</SUP> ions from seawater. </LI> <LI> Discharging of the system can capture CO<SUB>2</SUB> via formation of carbonate precipitates. </LI> </UL> </P>
네트워크 프로세서에 적합한 개선된 AntNet기반 라우팅 최적화기법
박현태,배성일,안진호,강성호,Park Hyuntae,Bae Sung-il,Ahn Jin-Ho,Kang Sungho 대한전자공학회 2005 電子工學會論文誌-TC (Telecommunications) Vol.42 No.5
본 논문은 생태계 군집 시스템을 네트워크 기술에 응용한 적응형 라우팅 알고리즘인 AntNet을 기존의 상용 네트워크 프로세서 기반에서 최적화할 수 있도록 개선된 알고리즘을 제안하는 연구이다. 현재 사용되고 있는 네트워크 프로세서는 단순한 패킷 프로세싱만을 위해 설계되어 AntNet과 같은 복잡한 연산이 필요한 적응형 라우팅 알고리즘을 구현하는데 많은 문제점을 가지고 있다. 이를 분석하고 해결하기 위해 AntNet의 강화인자를 연산하는 부분을 중심으로 적응 성능은 유지하면서도 효율적으로 연산실행시간을 줄일 수 있는 개선된 AntNet알고리즘을 제안하였다. 이를 시뮬레이션을 통해 비교분석함으로서 제안한 개선된 AntNet알고리즘의 효용성을 검증한다. In this paper, a new modified and optimized AntNet algorithm which can be implemented efficiently onto network processor is proposed. The AntNet that mimics the activities of the social insect is an adaptive agent-based routing algorithm. This method requires a complex arithmetic calculating system. However, since network processors have simple arithmetic units for a packet processing, it is very difficult to implement the original AntNet algorithm on network processors. Therefore, the proposed AntNet algorithm is a solution of this problem by decreasing arithmetic executing cycles for calculating a reinforcement value without loss of the adaptive performance. The results of the simulations show that the proposed algorithm is more suitable and efficient than the original AntNet algorithm for commercial network processors.
( Seong Hyeon Lee ),( Ki-jin Ryu ),( Kyong Wook Yi ),( Yong Jin Kim ),( Jung Ho Shin ),( Jun Young Hur ),( Tak Kim ),( Jong Bae Seo ),( Kwang-sig Lee ),( Hyuntae Park ) 대한산부인과학회 2020 대한산부인과학회 학술대회 Vol.106 No.-
Objective: This study uses machine learning and general hospital data to analyze the determinants of womens vasomotor symptoms. Methods: Data came from Korea University Anam Hospital in Seoul, Korea, with 3298 women, aged 40-80 years, who attended their general health check from January 2010 to December 2012. Five machine learning methods were applied and compared for the prediction of vasomotor symptoms, measured by a Menopause Rating Scale. Variable importance, the effect of a variable on model performance, was used for identifying major determinants of vasomotor symptoms. Results: In terms of the mean squared error for predicting vasomotor symptoms, the random forest (0.9326) was a much better model than linear regression (12.4856) and artificial neural networks with one, two and three hidden layers (1.5576, 1.5184 and 1.5833, respectively). Based on variable importance from the random forest, the most important determinants of vasomotor symptoms were age, menopause age, thyroid stimulating hormone, monocyte and triglyceride, as well as gamma glutamyl transferase, blood urea nitrogen, cancer antigen 19-9, C-reactive protein and low-density-lipoprotein cholesterol. Indeed, the following determinants ranked within the top 20 in terms of variable importance: cancer antigen 125, total cholesterol, insulin, free thyroxine, forced vital capacity, alanine aminotransferase, forced expired volume in one second, height, homeostatic model assessment for insulin resistance and carcinoembryonic antigen. Conclusion: For preventing womens vasomotor symptoms, preventive measures would be needed regarding the thyroid function, the lipid profile, the liver function, inflammation markers, insulin resistance, the monocyte, cancer antigens and the lung function.