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Roll-to-Roll Laser-Printed Graphene-Graphitic Carbon Electrodes for High-Performance Supercapacitors
Kang, Sangmin,Lim, Kyungmi,Park, Hyeokjun,Park, Jong Bo,Park, Seong Chae,Cho, Sung-Pyo,Kang, Kisuk,Hong, Byung Hee American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.1
<P>Carbon electrodes including graphene and thin graphite films have been utilized for various energy and sensor applications, where the patterning of electrodes is essentially included. Laser scribing in a DVD writer and inkjet printing were used to pattern the graphene-like materials, but the size and speed of fabrication has been limited for practical applications. In this work, we devise a simple strategy to use conventional laser-printer toner materials as precursors for graphitic carbon electrodes. The toner was laser-printed on metal foils, followed by thermal annealing in hydrogen environment, finally resulting in the patterned thin graphitic carbon or graphene electrodes for supercapacitors. The electrochemical cells made of the graphene-graphitic carbon electrodes show remarkably higher energy and power performance compared to conventional supercapacitors. Furthermore, considering the simplicity and scalability of roll-to-roll (R2R) electrode patterning processes, the proposed method would enable cheaper and larger-scale synthesis and patterning of graphene-graphitic carbon electrodes for various energy applications in the future.</P> [FIG OMISSION]</BR>
Kang, Sangmin,Koo, Ja-Jung,Seo, Hongmin,Truong, Quang Trung,Park, Jong Bo,Park, Seong Chae,Jung, Youngjin,Cho, Sung-Pyo,Nam, Ki Tae,Kim, Zee Hwan,Hong, Byung Hee The Royal Society of Chemistry 2019 Journal of Materials Chemistry C Vol.7 No.33
<P>It has been reported that defects in molybdenum disulfide (MoS2) enable the hydrogen evolution reaction (HER). The most widely employed method of argon-plasma treatment for defect generation suffers from poor material stability and loss of conductivity. Here, we report a new method to synthesize highly polycrystalline molybdenum disulfide MoS2 bilayers with enhanced HER performance and material stability. This new method is based on metal organic chemical vapor deposition (MOCVD) followed by UV/ozone treatment to generate defects. The defect densities on MoS2 were identified by the increase in lifetime (∼76%) and intensity (∼15%) in photoluminescence (PL) as compared to those of pristine MoS2. Our fabrication and characterization methods can be further applied to optimize defect densities for catalytic effects in various transition metal dichalcogenide (TMDC) materials.</P>
Host Innate Immunity against Hepatitis E Virus and Viral Evasion Mechanisms
( Sangmin Kang ),( Jinjong Myoung ) 한국미생물생명공학회(구 한국산업미생물학회) 2017 Journal of microbiology and biotechnology Vol.27 No.10
Hepatitis E virus (HEV) infections cause epidemic or sporadic acute hepatitis, which are mostly self-limiting. However, viral infection in immunocompromised patients and pregnant women may result in serious consequences, such as chronic hepatitis and liver damage, mortality of the latter of which reaches up to 20-30%. Type I interferon (IFN)-induced antiviral immunity is known to be the first-line defense against virus infection. Upon HEV infection in the cell, the virus genome is recognized by pathogen recognition receptors, leading to rapid activation of intracellular signaling cascades. Expression of type I IFN triggers induction of a barrage of IFN-stimulated genes, helping the cells cope with viral infection. Interestingly, some of the HEV-encoded genes seem to be involved in disrupting signaling cascades for antiviral immune responses, and thus crippling cytokine/chemokine production. Antagonistic mechanisms of type I IFN responses by HEV have only recently begun to emerge, and in this review, we summarize known HEV evasion strategies and compare them with those of other hepatitis viruses.
Hepatitis E Virus Methyltransferase Inhibits Type I Interferon Induction by Targeting RIG-I
( Sangmin Kang ),( Changsun Choi ),( Insoo Choi ),( Kwi-nam Han ),( Seong Woon Roh ),( Jongsun Choi ),( Joseph Kwon ),( Mi-kyung Park ),( Seong-jun Kim ),( Jinjong Myoung ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.9
The type I interferons (IFNs) play a vital role in activation of innate immunity in response to viral infection. Accordingly, viruses have evolved to employ various survival strategies to evade innate immune responses induced by type I IFNs. For example, hepatitis E virus (HEV) encoded papain-like cysteine protease (PCP) has been shown to inhibit IFN activation signaling by suppressing K63-linked de-ubiquitination of retinoic acid-inducible gene I (RIG-I) and TANK-binding kinase 1 (TBK1), thus effectively inhibiting down-stream activation of IFN signaling. In the present study, we demonstrated that HEV inhibits polyinosinic-polycytidylic acid (poly(I:C))-induced IFN-β transcriptional induction. Moreover, by using reporter assay with individual HEV-encoded gene, we showed that HEV methyltransferase (MeT), a nonstructural protein, significantly decreases RIG-I-induced IFN-β induction and NF-κB signaling activities in a dose-dependent manner. Taken together, we report here that MeT, along with PCP, is responsible for the inhibition of RIG-I-induced activation of type I IFNs, expanding the list of HEV-encoded antagonists of the host innate immunity.
Lee, Sangmin,Yoon, Hwa In,Na, Jin Hee,Jeon, Sangmin,Lim, Seungho,Koo, Heebeom,Han, Sang-Soo,Kang, Sun-Woong,Park, Soon-Jung,Moon, Sung-Hwan,Park, Jae Hyung,Cho, Yong Woo,Kim, Byung-Soo,Kim, Sang Kyoon IPC Science and Technology Press 2017 Biomaterials Vol.139 No.-
<P><B>Abstract</B></P> <P>It is urgently necessary to develop reliable non-invasive stem cell imaging technology for tracking the <I>in vivo</I> fate of transplanted stem cells in living subjects. Herein, we developed a simple and well controlled stem cell imaging method through a combination of metabolic glycoengineering and bioorthogonal copper-free click chemistry. Firstly, the exogenous chemical receptors containing azide (-N<SUB>3</SUB>) groups were generated on the surfaces of stem cells through metabolic glycoengineering using metabolic precursor, tetra-acetylated <I>N</I>-azidoacetyl-<SMALL>D</SMALL>-mannosamine(Ac<SUB>4</SUB>ManNAz). Next, bicyclo[6.1.0]nonyne-modified glycol chitosan nanoparticles (BCN-CNPs) were prepared as imageable nanoparticles to deliver different imaging agents. Cy5.5, iron oxide nanoparticles and gold nanoparticles were conjugated or encapsulated to BCN-CNPs for optical, MR and CT imaging, respectively. These imageable nanoparticles bound chemical receptors on the Ac<SUB>4</SUB>ManNAz-treated stem cell surface specifically via bioorthogonal copper-free click chemistry. Then they were rapidly taken up by the cell membrane turn-over mechanism resulting in higher endocytic capacity compared non-specific uptake of nanoparticles. During <I>in vivo</I> animal test, BCN-CNP-Cy5.5-labeled stem cells could be continuously tracked by non-invasive optical imaging over 15 days. Furthermore, BCN-CNP-IRON- and BCN-CNP-GOLD-labeled stem cells could be efficiently visualized using <I>in vivo</I> MR and CT imaging demonstrating utility of our stem cell labeling method using chemical receptors. These results conclude that our method based on metabolic glycoengineering and bioorthogonal copper-free click chemistry can stably label stem cells with diverse imageable nanoparticles representing great potential as new stem cell imaging technology.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Tumor-Homing Glycol Chitosan-Based Optical/PET Dual Imaging Nanoprobe for Cancer Diagnosis
Lee, Sangmin,Kang, Sun-Woong,Ryu, Ju Hee,Na, Jin Hee,Lee, Dong-Eun,Han, Seung Jin,Kang, Choong Mo,Choe, Yearn Seong,Lee, Kyo Chul,Leary, James F.,Choi, Kuiwon,Lee, Kyung-Han,Kim, Kwangmeyung American Chemical Society 2014 Bioconjugate chemistry Vol.25 No.3
<P>Imaging techniques including computed tomography, magnetic resonance imaging, and positron emission tomography (PET) offer many potential benefits to diagnosis and treatment of cancers. Each method has its own strong and weak points. Therefore, multimodal imaging techniques have been highlighted as an alternative method for overcoming the limitations of each respective imaging method. In this study, we fabricated PET/optical activatable imaging probe based on glycol chitosan nanoparticles (CNPs) for multimodal imaging. To prepare the dual PET/optical probes based on CNPs, both <SUP>64</SUP>Cu radiolabeled DOTA complex and activatable matrix metalloproteinase (MMP)-sensitive peptide were chemically conjugated onto azide-functionalized CNPs via bio-orthogonal click chemistry, which was a reaction between azide group and dibenzyl cyclooctyne. The PET/optical activatable imaging probes were visualized by PET and optical imaging system. Biodistribution of probes and activity of MMP were successfully measured in tumor-bearing mice.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bcches/2014/bcches.2014.25.issue-3/bc500020g/production/images/medium/bc-2014-00020g_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/bc500020g'>ACS Electronic Supporting Info</A></P>
강상민(Sangmin Kang),윤마루(Maru Yoon),선우명호(Myoungho Sunwoo) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of an engine-control TCS is to regulate engine torque in order to keep driven wheel slip in a desired range. Engine torque can be regulated by a throttle valve. In this paper, the engine-control TCS based on an engine model and estimated load torque by a Luenberger observer is proposed. For this control scheme, the engine model is required for model-based controller design using sliding mode control. Engine torque controller determines throttle angle for maintaining the desired manifold pressure to generate engine torque corresponding to the desired wheel torque. Since the load torque is composed of the external sources such as friction force, drag force, mechanical losses, and others, load torque estimation is required. The simulation results in various maneuvers during slippery and split road conditions have showed the better acceleration performance and stability of the vehicle with TCS. In addition, the load torque observer has estimated real load torque by 0.1 -0.2% RMSE(root mean square error).