Wireless Power Transfer for Electric Vehicles Charging Based on Hybrid Topology Switching With a Single Inverter

Yafei Chen,Hailong Zhang,Dong-Hee Kim,Sung-Jun Park,Seong-Mi Park 한국산업융합학회 2020 한국산업융합학회 논문집 Vol.23 No.2

In wireless power transfer (WPT) system, the conventional compensation topologies only can provide a constant current (CC) or constant voltage (CV) output under their resonant conditions. It is difficult to meet the CC and CV hybrid charging requirements without any other schemes. In this study, a switching hybrid topology (SHT) is proposed for CC and CV electric vehicle (EV) battery charging. By utilizing an additional capacitor and two AC switches (ACSs), a double-side LCC (DS-LCC) and an inductor and double capacitors-series (LCC-S) topologies are combined. According to the specified CC and CV charging profile, the CC and CV charging modes can be flexibly converted by the two additional ACSs. In addition, zero phase angle (ZPA) also can be achieved in both charging modes. In this method, because the operating frequency is fixed, without using PWM control, and only a small number of devices are added, it has the benefits of low-cost, easy-controllability and high efficiency. A 3.3-kW experimental prototype is configured to verify the proposed switching hybrid charger. The maximum DC efficiencies (at 3.3-kW) of the proposed SHT is 92.58%.

Wireless Power Transfer for Electric Vehicles Charging Based on Hybrid Topology Switching With a Single Inverter

Chen, Yafei,Zhang, Hailong,Kim, Dong-Hee,Park, Sung-Jun,Park, Seong-Mi The Korean Society of Industry Convergence 2020 한국산업융합학회 논문집 Vol.23 No.2

In wireless power transfer (WPT) system, the conventional compensation topologies only can provide a constant current (CC) or constant voltage (CV) output under their resonant conditions. It is difficult to meet the CC and CV hybrid charging requirements without any other schemes. In this study, a switching hybrid topology (SHT) is proposed for CC and CV electric vehicle (EV) battery charging. By utilizing an additional capacitor and two AC switches (ACSs), a double-side LCC (DS-LCC) and an inductor and double capacitors-series (LCC-S) topologies are combined. According to the specified CC and CV charging profile, the CC and CV charging modes can be flexibly converted by the two additional ACSs. In addition, zero phase angle (ZPA) also can be achieved in both charging modes. In this method, because the operating frequency is fixed, without using PWM control, and only a small number of devices are added, it has the benefits of low-cost, easy-controllability and high efficiency. A 3.3-kW experimental prototype is configured to verify the proposed switching hybrid charger. The maximum DC efficiencies (at 3.3-kW) of the proposed SHT is 92.58%.

Evaluation of 관-Amyloid Peptides Fibrillation Induced by Nanomaterials Based on Molecular Dynamics and Surface Plasmon Resonance.

Hou, Yafei,Li, Pengfei,Zhou, Hongjian,Zhu, Xiaoli,Chen, Haifeng,Lee, Jaebeom,Koh, Kwangnak,Shen, Zhongming,Chen, Hongxia American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.2

<P>This report investigated the effect of carbon nanomaterials, single-wall carbon nanotube (SWCNT) and graphene oxide, on fibrillation of 관-amyloid 40 (A관40) based on surface plasmon resonance (SPR) and molecular dynamics (MD). MD simulations are carried out in order to reveal the molecular mechanisms of the interaction between nanomaterials and A관40. The strong interaction between A관40 and nanomaterials is related to Van der Waals forces and the Coulomb force, inducing delicate manipulation of the main bonding energy for fibrillation of A관40. The interaction energy between the A관 peptide and graphene is higher than that of SWCNT. Experimental results show both carbon nanomaterials enhance the appearance of a critical nucleus for nucleation of peptide fibrils. Graphene is more beneficial to assist the nucleation process than SWCNT. Combination of SPR and molecular dynamics could be a high-throughput method to screen protein fibrillation.</P>

Bidirectional DC-DC Converter Based on Quasi-Sepic for Battery Charging System

Hailong Zhang,Yafei Chen,Dong-Hee Kim,Sung-Jun Park,Seong-Mi Park 한국산업융합학회 2020 한국산업융합학회 논문집 Vol.23 No.2

In order to satisfy the voltage levels of the low voltage battery side and high voltage DC bus, a high voltage gain with bidirectional operation is required. In this system, the cost effectiveness of the design is a critical factor; therefore, the system should be designed using a small number of components. This paper propose a novel bidirectional converter composed with a quasi-sepic and switched-indictor network. The proposed converter consists a small number of components with a high voltage gain ratio. Detailed analysis are made with respect to the operating mode, number of components, voltage and current ripple and efficiency. To verify performance of the proposed converter, simulation was performed is this paper. The simulation results are shown to verify the feasibility and performance of the proposed bidirectional converter.

Bidirectional DC-DC Converter Based on Quasi-Sepic for Battery Charging System

Zhang, Hailong,Chen, Yafei,Kim, Dong-Hee,Park, Sung-Jun,Park, Seong-Mi The Korean Society of Industry Convergence 2020 한국산업융합학회 논문집 Vol.23 No.2

In order to satisfy the voltage levels of the low voltage battery side and high voltage DC bus, a high voltage gain with bidirectional operation is required. In this system, the cost effectiveness of the design is a critical factor; therefore, the system should be designed using a small number of components. This paper propose a novel bidirectional converter composed with a quasi-sepic and switched-indictor network. The proposed converter consists a small number of components with a high voltage gain ratio. Detailed analysis are made with respect to the operating mode, number of components, voltage and current ripple and efficiency. To verify performance of the proposed converter, simulation was performed is this paper. The simulation results are shown to verify the feasibility and performance of the proposed bidirectional converter.

Transformerless Bidirectional DC-DC Converter for Battery Storage System with High Voltage Gain

Hailong Zhang,Yafei Chen,Chang-Su Shin,Sung-Jun Park,Dong-Hee Kim 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

Bidirectional DC-DC converters with wide voltage conversion ratio are essential in energy storage systems. In these systems (ESS), cost effective design is important factor, therefore, it needs to be designed with small numbers of component. This paper proposes a family of high voltage gain bidirectional converter based on the integration of Boost converter with Ćuk, SEPIC, BUCK-BOOST converters respectively. Detail comparisons are progressed in terms of operating mode, numbers of component, and efficiency. The experiment results are carried to verify the proposed converter family. The results show that converter I present the highest efficiency in boost mode (92%) and in buck mode (92.2%).

The Effect of Carbon Nanomaterials on Senescence of Cut Flowers in Carnation (Dianthus caryophyllus L.)

Di Zhang,Xiaotong Chen,Jiangyuan Sheng,Yafei Zhang,Xiaohui Shen,Li Ren 한국원예학회 2021 원예과학기술지 Vol.39 No.3

Carbon nanomaterials (CNMs) have remarkable chemical, physical, electrical, and structural properties and favorable biocompatibility. This study used carnation (Dianthus caryophyllus L.) cut flowers as a model to evaluate the protective effects of 3 kinds of CNMs (single-walled carbon nanotubes [SWCNT], graphene quantum dots [GQD], and fullerenes [C60]) on the antioxidant activity and senescence of plant cells. We found that 1 mg·L<SUP>-1</SUP> C60 and 25 mg·L<SUP>-1</SUP> GQD extended the vase life (VL) of carnation by approximately 10%. SWCNT cannot be absorbed and transported by plant vascular tissue, and higher concentrations of SWCNT can block vascular tissue, leading to decreased VL. Physiological tests have shown that the The malondialdehyde (MDA) and hydroxyl radical (OH·) levels significantly decreased after the GQD and C60 treatments, and the main factors that cause cell damage changed from H₂O₂ to OH·. The in vitro Fenton reaction and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging assay indicated that both C60 and GQD may inhibit OH· generation by approximately 10% to 15%, and GQD had higher DPPH free radical scavenging activity. Accordingly, a suitable concentration of C60 and GQD can influence reactive oxygen species metabolism and downstream biological events, including the cell redox state, the antioxidant system, and membrane lipid peroxidation, effectively delaying senescence and abscission of plant tissue.

Abnormal Crowd Motion Detection with Hidden Conditional Random Fields Model

Dongping Zhang,Kaihang Xu,Yafei Lu,Chen Pan,Huailiang Peng 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.10

Crowd motion analysis in public places is an important research subject in the monitoring field. This paper proposes an approach for detecting abnormal crowd motion using Hidden Conditional Random Fields Model (HCRF). This approach derives variations of motion patterns from direction distribution of the crowd motion obtained by the optical flow and these variations are encoded with HCRF to allow for the detection of abnormal crowd motion. Modeling the temporal neighborhood relations in a video sequence based on HCRF can incorporate hidden states and label the video depending on long range observations. The experimental results show that this proposed algorithm can achieve better results than HMM and CRF.

Visualization of Multicolored in vivo Organelle Markers for Co-Localization Studies in Oryza sativa

Dangol, Sarmina,Singh, Raksha,Chen, Yafei,Jwa, Nam-Soo Korean Society for Molecular and Cellular Biology 2017 Molecules and cells Vol.40 No.11

Eukaryotic cells consist of a complex network of thousands of proteins present in different organelles where organelle-specific cellular processes occur. Identification of the subcellular localization of a protein is important for understanding its potential biochemical functions. In the post-genomic era, localization of unknown proteins is achieved using multiple tools including a fluorescent-tagged protein approach. Several fluorescent-tagged protein organelle markers have been introduced into dicot plants, but its use is still limited in monocot plants. Here, we generated a set of multicolored organelle markers (fluorescent-tagged proteins) based on well-established targeting sequences. We used a series of pGWBs binary vectors to ameliorate localization and co-localization experiments using monocot plants. We constructed different fluorescent-tagged markers to visualize rice cell organelles, i.e., nucleus, plastids, mitochondria, peroxisomes, golgi body, endoplasmic reticulum, plasma membrane, and tonoplast, with four different fluorescent proteins (FPs) (G3GFP, mRFP, YFP, and CFP). Visualization of FP-tagged markers in their respective compartments has been reported for dicot and monocot plants. The comparative localization of the nucleus marker with a nucleus localizing sequence, and the similar, characteristic morphology of mCherry-tagged Arabidopsis organelle markers and our generated organelle markers in onion cells, provide further evidence for the correct subcellular localization of the Oryza sativa (rice) organelle marker. The set of eight different rice organelle markers with four different FPs provides a valuable resource for determining the subcellular localization of newly identified proteins, conducting co-localization assays, and generating stable transgenic localization in monocot plants.

Visualization of Multicolored in vivo Organelle Markers for Co-Localization Studies in Oryza sativa

Sarmina Dangol,Raksha Singh,Yafei Chen,좌남수 한국분자세포생물학회 2017 Molecules and cells Vol.40 No.11

Eukaryotic cells consist of a complex network of thousands of proteins present in different organelles where organelle-specific cellular processes occur. Identification of the subcellular localization of a protein is important for understanding its potential biochemical functions. In the post-genomic era, localization of unknown proteins is achieved using multiple tools including a fluorescent-tagged protein approach. Several fluorescent-tagged protein organelle markers have been introduced into dicot plants, but its use is still limited in mon-ocot plants. Here, we generated a set of multicolored organelle markers (fluorescent-tagged proteins) based on well-established targeting sequences. We used a series of pGWBs binary vectors to ameliorate localization and co-localization experiments using monocot plants. We constructed different fluorescent-tagged markers to visualize rice cell organelles, i.e., nucleus, plastids, mitochondria, peroxisomes, golgi body, endoplasmic reticulum, plasma membrane, and tonoplast, with four different fluorescent proteins (FPs) (G3GFP, mRFP, YFP, and CFP). Visualization of FP-tagged markers in their respective compartments has been reported for dicot and monocot plants. The comparative localization of the nucleus marker with a nucleus localizing sequence, and the similar, characteristic morphology of mCherry-tagged Arabidopsis organelle markers and our gen-erated organelle markers in onion cells, provide further evidence for the correct subcellular localization of the Oryza sativa (rice) organelle marker. The set of eight different rice organelle markers with four different FPs provides a valuable resource for determining the subcellular localization of newly identified proteins, conducting co-localization assays, and generating stable transgenic localization in monocot plants.