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- 저자 : Yeonho jeong (검색결과 43 건)
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Yeonho Jeong,Jong-Woo Kim,Cheon-Yong Lim,Dong-Kwan Kim,Jae-Il Baek,Gun-Woo Moon 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The phase-shifted full bridge (PSFB) converter is widely used in the middle and high power applications such as a server power system. However, due to the newly required trend for high light-load efficiency, the PSFB converter has a limitation for light-load efficiency because of a large circulating current, core losses of the transformer and inductors, and the insufficiency ZVS energy of lagging-leg switches. To achieve high light-load efficiency in PSFB converter, the circulating current in the freewheeling mode and the core loss should be reduced. Therefore, this paper proposes the strategic control scheme employing the control scheme of the two-switch forward (TSF) converter. In addition, by applying the additional one gate signal and the expanded dead-time, the switching loss can be significantly reduced. To verify the proposed method, the prototype converter with 750W (12V/62.5A) is built and tested.
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Jeong, Yeonho,Kim, Jae-Kuk,Lee, Jae-Bum,Moon, Gun-Woo IEEE 2017 IEEE TRANSACTIONS ON POWER ELECTRONICS - Vol.32 No.10
<P>A new asymmetric half-bridge (HB) resonant converter for dc/dc power system with a wide range of low input voltage is proposed in this paper. The proposed converter is easily derived based on the switch integration technique, merging a buck-boost, which is the same with the active-clamp forward's primary circuit, and the HB LLC resonant converter. By adopting the buck-boost circuit in front of the HB LLC resonant converter, higher input voltage of LLC resonant converter stage can be achieved. As a result, the primary conduction loss can be significantly reduced. In addition, to cover wide input voltage range, an asymmetric pulse width modulation control is applied. It can mitigate the design limitation for a high efficiency. Moreover, the proposed converter can achieve not only the small conduction loss and the optimal design for high efficiency, but also high power density and low cost due to the switch integration technique. The validity of the proposed converter is confirmed by the experimental results of a prototype converter with 36-72 V-DC input and 300 W (12 V/25 A) output.</P>
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Three-Dimensional Reduced-Symmetry of Colloidal Plasmonic Nanoparticles
Jeong, Eunhye,Kim, Kihoon,Choi, Inhee,Jeong, Sunil,Park, Younggeun,Lee, Hyunjoo,Kim, Soo Hong,Lee, Luke P.,Choi, Yeonho,Kang, Taewook American Chemical Society 2012 NANO LETTERS Vol.12 No.5
<P>Owing to their novel optical properties, three-dimensional plasmonic nanostructures with reduced symmetry such as a nanocrescent and a nanocup have attracted considerable current interest in biophotonic imaging and sensing. However, their practical applications have been still limited since the colloidal synthesis of such structures that allows, in principle, for in vivo application and large-scale production has not been explored yet. To date, these structures have been fabricated only on two-dimensional substrates using micro/nanofabrication techniques. Here we demonstrate an innovative way of breaking symmetry of colloidal plasmonic nanoparticles. Our strategy exploits the direct overgrowth of Au on a hybrid colloidal dimer consisting of Au and polystyrene (PS) nanoparticles without the self-nucleation of Au in an aqueous solution. Upon the overgrowth reaction, the steric crowding of PS leads to morphological evolution of the Au part in the dimer ranging from half-shell, nanocrescent to nanoshell associated with the appearance of the second plasmon absorption band in near IR. Surface-enhanced Raman scattering signal is obtained directly from the symmetry-broken nanoparticles solution as an example showing the viability of the present approach. We believe our concept represents an important step toward a wide range of biophotonic applications for optical nanoplasmonics such as targeting, sensing/imaging, gene delivery, and optical gene regulations.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-5/nl300435j/production/images/medium/nl-2012-00435j_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl300435j'>ACS Electronic Supporting Info</A></P>
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Jeong, Yeonho,Kim, Jae-Kuk,Moon, Gun-Woo Institute of Electrical and Electronics Engineers 2018 IEEE transactions on industrial electronics Vol.65 No.3
<P>A bridgeless dual boost rectifier is proposed to achieve a soft switching for power factor correction circuit. Based on the conventional bridgeless dual boost rectifier, an auxiliary circuit is employed in the proposed converter to perform zero-voltage switching of the main switches and zero-current switching of the auxiliary switches. As a result, switching losses can be significantly reduced. In addition, the design guideline for the optimized turn-on time of the auxiliary switches is presented to minimize the additional conduction loss in the auxiliary circuit. The validity of the proposed converter is confirmed by the experimental results of a prototype converter with 100–240 <TEX>$V_{{\text{AC}}}$</TEX> universal-line input and 800-W (400 V/2 A) output.</P>
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Jeong Min Gyu,Zhou Kai,Park Soyeon,An HyeongJeon,Kwon Yonghoon,Chang Yeonho,Kim Do-Hyeon,Ryu Sung Ho 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-
Various repertoires of membrane protein interactions determine cellular responses to diverse environments around cells dynamically in space and time. Current assays, however, have limitations in unraveling these interactions in the physiological states in a living cell due to the lack of capability to probe the transient nature of these interactions on the crowded membrane. Here, we present a simple and robust assay that enables the investigation of transient protein interactions in living cells by using the single-molecule diffusional mobility shift assay (smDIMSA). Utilizing smDIMSA, we uncovered the interaction profile of EGFR with various membrane proteins and demonstrated the promiscuity of these interactions depending on the cancer cell line. The transient interaction profile obtained by smDIMSA will provide critical information to comprehend the crosstalk among various receptors on the plasma membrane.
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Improved resolution in single-molecule localization microscopy using QD-PAINT
Chang Yeonho,Kim Do-Hyeon,Zhou Kai,Jeong Min Gyu,Park Soyeon,Kwon Yonghoon,Hong Triet Minh,Noh Jungeun,Ryu Sung Ho 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-
Single-molecule localization microscopy (SMLM) has allowed the observation of various molecular structures in cells beyond the diffraction limit using organic dyes. In principle, the SMLM resolution depends on the precision of photoswitching fluorophore localization, which is inversely correlated with the square root of the number of photons released from the individual fluorophores. Thus, increasing the photon number by using highly bright fluorophores, such as quantum dots (QDs), can theoretically fundamentally overcome the current resolution limit of SMLM. However, the use of QDs in SMLM has been challenging because QDs have no photoswitching property, which is essential for SMLM, and they exhibit nonspecificity and multivalency, which complicate their use in fluorescence imaging. Here, we present a method to utilize QDs in SMLM to surpass the resolution limit of the current SMLM utilizing organic dyes. We confer monovalency, specificity, and photoswitchability on QDs by steric exclusion via passivation and ligand exchange with ptDNA, PEG, and casein as well as by DNA point accumulation for imaging in nanoscale topography (DNA-PAINT) via automatic thermally driven hybridization between target-bound docking and dye-bound complementary imager strands. QDs are made monovalent and photoswitchable to enable SMLM and show substantially better photophysical properties than Cy3, with higher fluorescence intensity and an improved resolution factor. QD-PAINT displays improved spatial resolution with a narrower full width at half maximum (FWHM) than DNA-PAINT with Cy3. In summary, QD-PAINT shows great promise as a next-generation SMLM method for overcoming the limited resolution of the current SMLM.
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Characteristics of Floating Photovoltaic Power Generation Based on Probability Statistics
Hansang Jeong,Jaeho Choi,Hohyun Lee,Yeonho Ok 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In order to analyze the accurate power generation characteristics of the floating photovoltaic (PV) system, the same 2.5kW PV systems are installed on the surface of Dam water and the near ground, and the performance is compared. The output characteristics of the floating PV power generation according to the change of water temperature is analyzed by using the probability statistical technique in detail, and it is verified that the low temperature of the floating PV system module is caused by the cooling effect of water surface. From the comparative study between them, it is confirmed that the floating PV module temperature is lower than that of land based PV, so that the efficiency of the floating PV power generation is higher than that of the grounding PV power generation.
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Bacterial Contamination Conditions in Ambulances and their Equipment in South Korea
( Tae Oh Jeong ),( In Sool Yoo ),( Yeonho You ),( Kye Chul Kwon ) 대한응급의학회 2012 대한응급의학회지 Vol.23 No.1
Purpose: Many patients in South Korea are brought to hospitals by ambulance. As such, bacterial contamination within the ambulance and their critical or semi-critical equipment may be dangerous, especially for immunocompromised patients. No previous studies have examined the distribution patterns of pathogenic bacteria in ambulances or the bacterial contamination rate associated with riding in an ambulance in South Korea. The purpose of this study was to determine the distribution of pathogenic bacteria species in ambulances, and to investigate the bacterial contamination rate associated with ambulances and their equipment, in South Korea. Methods: Thirty ambulances (17 from private facilities and 13 from regional emergency centers) were enlisted for this study. We took 955 swabs and isolated the resulting bacteria. We surveyed the intervals between cleaning and disinfecting of the ambulances and their equipment. We compared the distributional of the bacterial species, following Spaulding`s classification, between critical equipment (CE), semi-critical equipment (SCE) and non-critical equipment (NCE) in the ambulances, using the chi-square test. Results: The ambulances were cleaned and disinfected every 5 and 8 days, respectively. The equipment was cleaned and disinfected once every 22 and 30 days, respectively. Of the 955 swabs, 159 (16.6%) were found to be contaminated by bacteria. Fourteen pathogenic bacteria were isolated from the CE and SCE, but no methicillinresistant or vancomycin-resistant bacteria were found. Conclusion: Approximately 16.6% of the ambulances and their equipment were contaminated by bacteria, and pathogenic bacteria were found on both CE and SCE. Consequently, in South Korea, we find a risk associated with the hazard presented by bacterial contamination in ambulance CE and SCE.
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