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Lee, So Yeong,Kim, Sung Han,Kim, Sung Min,Lee, Hyukjin,Lee, Gibaek,Park, Sung Young The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.6
<P>A novel type of zwitterionic fluorescent nanoparticles (ZFNPs) containing polysulfobetaine groups, the boron dipyrromethane (BODIPY) fluorophore and graphene oxide plates is prepared for the detection of tumor cells in response to the intra- and extracellular stimuli. The fluorescence intensities of the ZFNPs are highly influenced by temperature and pH.</P> <P>Graphic Abstract</P><P>Novel fluorescence probes, reduced graphene oxide (rGO) containing zwitterionic fluorescent nanoparticles, for effective diagnosis of cancer cells. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3nj01641b'> </P>
A Hybrid Model for Fault Diagnosis Using Model Based Approaches and Support Vector Machine
Lee, Chang Jun,Lee, Gibaek,Han, Chonghun,Yoon, and En Sup The Society of Chemical Engineers, Japan 2006 Journal of chemical engineering of Japan Vol.39 No.10
<P>The procedure followed in chemical processes can be expressed in simple terms such as the flow of events from the raw materials to the product. To obtain the best final product, chemical engineers have to consider many factors including environmental effects, stability, economic considerations, and so on. In particular, when considering the stability if the process and the purity of the product, it is very important to detect any faults in the chemical process immediately.In this paper, a hybrid fault diagnosis model based on the signed digraph (SDG) and support vector machine (SVM) is proposed. By means of the system decomposition based on SDG, the local models of each measured variable are constructed and more accurate and fast models are using an SVM, which has no loss of information and shows good performance, in order to obtain the estimated value of the variable, which is then compared with the measured value in order to diagnose the fault. To verify the performance of the proposed model, the Tennessee Eastman (TE) Process was studied and the proposed method was found to demonstrate a good diagnosis capability compared with previous statistical methods.</P>
Online Burst Detection and Location of Water Distribution Systems and Its Practical Applications
Lee, Shin Je,Lee, Gibaek,Suh, Jung Chul,Lee, Jong Min American Society of Civil Engineers 2016 Journal of water resources planning and management Vol.142 No.1
<P>A novel methodology is proposed to detect and locate bursts in water pipe networks. Conventional detection methods include a cumulative sum (CUSUM) and a wavelet transform (WT). However, the CUSUM has a problem of slow response and the WT is sensitive to signal transitions. In this work, two algorithms are integrated to effectively detect sudden pressure changes of water pipe networks. A network node matrix is also proposed to systematically represent the candidate locations of bursts. The developed burst detection and location system is validated with real field data obtained from simulated bursts by opening hydrant valves for simple and complex pipe networks and the result shows better performance than previous works. (C) 2015 American Society of Civil Engineers.</P>
Hypostatic instability of aluminum anode in acidic ionic liquid for aluminum-ion battery
Lee, Danbi,Lee, Gibaek,Tak, Yongsug IOP 2018 Nanotechnology Vol.29 No.36
<P>Aluminum-ion batteries are considered to be a promising post lithium-ion battery system in energy storage devices because aluminum is earth-abundant, has a high theoretical capacity, and is of low cost. We report on the chemical activities and stabilities of chloroaluminate anions [Al<I> <SUB>n</SUB> </I>Cl<SUB> <I>n</I>+1</SUB>]<SUP>−</SUP> with aluminum metal using a different mole ratio of AlCl<SUB>3</SUB> and 1-ethyl-3-methylimidazolium chloride. The morphological changes in the Al metal surface are investigated as a function of dipping time in electrolyte, revealing that the Al metal surface is locally attacked by chloroaluminate anions followed by the formation of a new Al oxide layer with a specific lattice plane and a craterlike surface around the cracking site. The aluminum-ion battery exhibits outstanding cycle life and capacity even at the high C-rate of 3 A g<SUP>−1</SUP>, with a high energy efficiency of 98%, regardless of the differences in the size of chloroaluminate anions.</P>
A Study on the Effect of XR Glasses on Technology Acceptance and Presence in the Blind
Gibaek Lee,Baek Sujin,Park Sohyun,Yongbeom Lee,Kyunghee Lim,Eung-Kyo Suh,Gyuri Eum,Taehyung Kim,Sujin Park 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.10
The purpose of this study is to help the visually impaired lead a quality life by studying the effect of XR glasses on technology acceptability and sense of presence for the visually impaired. This study used the Technology Acceptance Model as a theoretical framework to verify the correlation of four variables: perceived immersion, information quality, XR presence, and digital informatization level for visually impaired people. As a result of the study, there were significant differences in technology acceptability in perceived ease of use, perceived usefulness, attitude toward use, and intention to use after the experiment on the visually impaired. There was no statistically significant difference in the variables related to the sense of presence, but a positive correlation could be confirmed. Based on the results of this study, it is expected to contribute to the technological advancement of XR glasses for the visually impaired.
Lee, Gibaek,Choi, Hyeonji,Tak, Yongsug IOP 2019 Nanotechnology Vol.30 No.8
<P>In this study, the degradation of different cathode carbon supports is investigated in proton exchange membrane fuel cells (PEMFCs). A platinum catalyst is synthesized using various carbon supports, such as Vulcan XC-72, graphite nanopowder and carbon nanotube, which are evaluated based on the fabrication of membrane electrode assemblies. During the startup and shutdown of PEMFCs, the individual electrode potential can be measured <I>in situ</I> using a dynamic hydrogen electrode. The cathode potential increases instantaneously to 1.4 V in one attempt, when H<SUB>2</SUB>/air boundaries are developed on the anode side during the fuel starvation, leading to significant carbon corrosion. The corrosion rates of various carbon supports are calculated from the concentration of gases, such as CO<SUB>2</SUB>, CO and SO<SUB>2</SUB>, emitted from the cathode outlet, measured directly <I>in situ</I> by Fourier transform infrared gas analysis. The carbon nanotube-supported Pt catalyst shows the best performance against carbon corrosion during fuel starvation, compared to commercial Pt/C catalyst and other types of carbon supports.</P>