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Jeon, Jongho,Yang, Jiwon,Park, Jong-Moon,Han, Na-Young,Lee, Yeong-Bae,Lee, Hookeun Elsevier 2018 Journal of chromatography. B, Analytical technolog Vol.1092 No.-
<P><B>Abstract</B></P> <P>Advanced glycation end products (AGEs) are known to play a leading part in the pathogenesis of human diseases, such as diabetes, Alzheimer's disease, lateral sclerosis, and atherosclerosis. It is for this reason that research on AGEs is crucial and large-scale studies are needed for the treatment of diseases. The aim of this study was to develop a reproducible method to analyze Amadori compounds using an automated enrichment protocol for high-throughput analysis of clinical samples. The developed method enabled the enrichment of Amadori compounds simultaneously from 96 samples, and it was applied to the discovery of biomarkers in AGEs related diseases. In this study, ten human serum samples were processed using automated filter-aided sample preparation (aFASP) in a 96-well filter plate, and the eluted peptide mixtures were enriched by Affinity Cellufine PB in a fritted 96-well filter plate using a liquid handling robotic system. The eluted glycated peptides were analyzed by a liquid chromatography-tandem mass spectrometry (LC-MS/MS) system. A total of 982 unique glycated peptides, corresponding to 524 unique glycated proteins, were identified from the analysis of ten human samples. The advantages and potentials of the automated sample preparation system were demonstrated through label free quantification of the glycated peptides.</P>
Jeon, Jongho,Choi, Mi Hee 대한방사성의약품학회 2015 Journal of radiopharmaceuticals and molecular prob Vol.1 No.1
Herein we present the synthesis of $^{68}Ga$-labeled gold nanoparticles for in vivo PET imaging. A novel chelator DTPA-Cys was easily prepared from diethylenetriaminepentaacetic dianhydride in high yield. The ${\alpha}_v{\beta}_3$ integrin receptor targeted gold nanoparticle probe was synthesized by using DTPA-Cys, polyethylene glycol and cRGD peptide. $^{68}Ga$ labeling of cRGD conjugated gold nanoparticle was carried out at $40^{\circ}C$ for 30 min. Observed radiochemical yield was more than 75% as determined by radio-TLC and the probe was purified by centrifugation. In vitro stability test showed that 90% of $^{68}Ga$-labeled gold nanoparticle probe was stable in FBS for 1 h. Those results demonstrated that $^{68}Ga$-labeled gold nanoparticle could be used as a potentially useful probe for specific tumor imaging.
Functional nanomaterial-based amplified bio-detection strategies
Jeon, Jongho,Lim, Dong-Kwon,Nam, Jwa-Min Royal Society of Chemistry 2009 Journal of materials chemistry Vol.19 No.15
<P>In the development of bio-detection assays that could be useful in a variety of applications such as medical diagnostic and biowarfare agent detection, improving assay sensitivity might be the foremost important task. To address this assay sensitivity issue, researchers have synthesized highly functional nanomaterials and used their structures and functions to amplify detection signals often without using enzymatic amplification that is essential in the polymerase chain reaction (PCR). Here, we review various amplification methods that facilitate ultrahigh assay sensitivity using functional nanomaterials. We describe the basic principles, advantages, limitations and perspectives of amplified bio-detection strategies based on optical, electrical, magnetic or mechanical properties of nanomaterials.</P> <P>Graphic Abstract</P><P>We review recent advances and applications of functional nanomaterial-based amplification strategies in bio-detection assays. Enzymatic and non-enzymatic amplification strategies using various nanomaterials' structures and properties are summarized, and basic principles, advantages, limitations and perspectives of these amplification strategies are discussed. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b816690k'> </P>
Jongho Jeon,So-Hee Kim,Jong Hyup Lee,Joon Seok Oh,Doh Yeon Park,김영규 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.5
The OsO4-catalyzed dihydroxylations of a monosubstituted allylic amine and γ-amino-α,β-unsaturated (E)-esters with bulky alkyl groups showed a high anti-selectivity. Since the acyclic conformation of N-acyloxy protected allylic amines was efficiently controlled by a bulky t-Bu or OBO ester group, the anti diastereoselectivity of >12.5:1 was obtained without applying a chiral reagent. The synthetic utility of the present method was demonstrated by a stereoselective and efficient synthesis of an α-glucosidase inhibitor 15 from commercially available N-Cbz-L-serine 6 in 11 steps and 31% yield.
Jeon, Yongseok,Jung, Jongho,Kim, Dongwoo,Kim, Sunjae,Kim, Yongchan Elsevier 2017 APPLIED ENERGY Vol.205 No.-
<P>The objective of this study was to investigate the effects of ejector geometries on the performance of an ejector expansion air conditioner (EEAC) considering the cooling seasonal performance factor (CSPF). The performance of the EEAC using R410A was measured and analyzed by varying the compressor speed, outdoor-bin temperature, operating pressures, nozzle-throat diameter, and mixing-section diameter. The EEAC in the medium capacity mode exhibited maximum coefficient of performance (COP) improvement, i.e., 7.5%, over the baseline (conventional) cycle. The optimum mixing-section diameter was determined to be 9 mm based on the CSPF. In addition, the optimum mixing-section diameter increased with an increase in the annual average outdoor temperature. The CSPF of the EEAC with the optimized mixing-section diameter improved in the range of 16.0-20.3% over the baseline cycle depending on the climatic conditions.</P>
Construction of a Thermal Vacuum Chamber for Environment Test of Triple CubeSat Mission TRIO-CINEMA
Jeon, Jeheon,Lee, Seongwhan,Yoon, Seyoung,Seon, Jongho,Jin, Ho,Lee, Donghun,Lin, Robert P. 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.4
TRiplet Ionospheric Observatory-CubeSat for Ion, Neutron, Electron & MAgnetic fields (TRIO-CINEMA) is a CubeSat with 3.14 kg in weight and 3-U (10 x 10 x 30 cm) in size, jointly developed by Kyung Hee University and UC Berkeley to measure magnetic fields of near Earth space and detect plasma particles. When a satellite is launched into orbit, it encounters ultrahighvacuum and extreme temperature. To verify the operation and survivability of the satellite in such an extreme space environment, experimental tests are conducted on the ground using thermal vacuum chamber. This paper describes the temperature control device and monitoring system suitable for CubeSat test environment using the thermal vacuum chamber of the School of Space Research, Kyung Hee University. To build the chamber, we use a general purpose thermal analysis program and NX 6.0 TMG program. We carry out thermal vacuum tests on the two flight models developed by Kyung Hee University based on the thermal model of the TRIO-CINEMA satellite. It is expected from this experiment that proper operation of the satellite in the space environment will be achieved.
A Preliminary Study on Precision Image Guidance for Electrode Placement in an EEG Study
Jeon, Sangseo,Chien, Jongho,Song, Chanho,Hong, Jaesung Springer-Verlag 2018 Brain topography Vol.31 No.2
<P>Conventional methods for positioning electroencephalography electrodes according to the international 10/20 system are based on the manual identification of the principal 10/20 landmarks via visual inspection and palpation, inducing intersession variations in their determined locations due to structural ambiguity or poor visibility. To address the variation issue, we propose an image guidance system for precision electrode placement. Following the electrode placement according to the 10/20 system, affixed electrodes are laser-scanned together with the facial surface. For subsequent procedures, the laser scan is conducted likewise after positioning the electrodes in an arbitrary manner, and following the measurement of fiducial electrode locations, frame matching is performed to determine a transformation from the coordinate frame of the position tracker to that of the laser-scanned image. Finally, by registering the intra-procedural scan of the facial surface to the reference scan, the current tracking data of the electrodes can be visualized relative to the reference goal positions without manually measuring the four principal landmarks for each trial. The experimental results confirmed that use of the electrode navigation system significantly improved the electrode placement precision compared to the conventional 10/20 system (p < 0.005). The proposed system showed the possibility of precise image-guided electrode placement as an alternative to the conventional manual 10/20 system.</P>