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New Single-Phase Power Converter Topology for Frequency Changing of AC Voltage
Jou, Hurng-Liahng,Wu, Jinn-Chang,Wu, Kuen-Der,Huang, Ting-Feng,Wei, Szu-Hsiang The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.3
This paper proposes a new single-phase power converter topology for changing the frequency of AC voltage. The proposed single-phase frequency converter (SFC) includes a T-type multi-level power converter (TMPC), a frequency decoupling transformer (FDT) and a digital signal processor (DSP). The TMPC can convert a 60 Hz AC voltage to a DC voltage and then convert the DC voltage to a 50 Hz AC voltage. Therefore, the output currents of the two T-type power switch arms have 50 Hz and 60 Hz components. The FDT is used to decouple the 50 Hz and 60 Hz components. The salient feature of the proposed SFC is that only one power electronic converter stage is used since the functions of the AC-DC and DC-AC power conversions are integrated into the TMPC. Therefore, the proposed SFC can simplify both the power circuit and the control circuit. In order to verify the functions of the proposed SFC, a hardware prototype is established. Experimental results verify that the performance of the proposed SFC is as expected.
New Single-Phase Power Converter Topology for Frequency Changing of AC Voltage
Hurng-Liahng Jou,Jinn-Chang Wu,Kuen-Der Wu,Ting-Feng Huang,Szu-Hsiang Wei 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.3
This paper proposes a new single-phase power converter topology for changing the frequency of AC voltage. The proposed single-phase frequency converter (SFC) includes a T-type multi-level power converter (TMPC), a frequency decoupling transformer (FDT) and a digital signal processor (DSP). The TMPC can convert a 60 Hz AC voltage to a DC voltage and then convert the DC voltage to a 50 Hz AC voltage. Therefore, the output currents of the two T-type power switch arms have 50 Hz and 60 Hz components. The FDT is used to decouple the 50 Hz and 60 Hz components. The salient feature of the proposed SFC is that only one power electronic converter stage is used since the functions of the AC-DC and DC-AC power conversions are integrated into the TMPC. Therefore, the proposed SFC can simplify both the power circuit and the control circuit. In order to verify the functions of the proposed SFC, a hardware prototype is established. Experimental results verify that the performance of the proposed SFC is as expected.
Aggregation mechanism of fine fly ash particles in uniform magnetic field
Chang-Sui Zhao,Yong-Wang Li,Xin Wu,Duan-Feng Lu,Song Han 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.2
of fly ash particles with size range of 0.023-9.314m in a uniform magnetic field was inves-tigated for removing them. A binary collision-aggregation model evaluating particle aggregation coefficient was devel-oped. Based on the model, particle removal efficiency was calculated by solving the General Dynamic Equation. Thecomparison was done between the calculated and experimental data. The modeling aggregation coefficient shows thatthe aggregation coefficient increases with particle size, and the bigger the size difference between two particles is, thehigher than those of the smaller and bigger ones. The effect of the magnetic flux density on total particle removal effi-ciency is similar to that on aggregation coefficient. Before particles are saturatedly magnetized, their total removal effi-ciency increases with an increase in the magnetic flux density. Higher removal efficiency can also be caused by pro-longing the particle residence time in the magnetic field or increasing their mass concentration. The particle numbermedian diameter decreases with an increase in the total removal efficiency. Calculation results are found to coincideessentially with the experimental data.
Wu, Ying,Gao, He,Li, Huaixing,Tabara, Yasuharu,Nakatochi, Masahiro,Chiu, Yen-Feng,Park, Eun Jung,Wen, Wanqing,Adair, Linda S.,Borja, Judith B.,Cai, Qiuyin,Chang, Yi-Cheng,Chen, Peng,Croteau-Chonka, Da Oxford University Press 2014 Human Molecular Genetics Vol.23 No.4
<P>Blood levels of adiponectin, an adipocyte-secreted protein correlated with metabolic and cardiovascular risks, are highly heritable. Genome-wide association (GWA) studies for adiponectin levels have identified 14 loci harboring variants associated with blood levels of adiponectin. To identify novel adiponectin-associated loci, particularly those of importance in East Asians, we conducted a meta-analysis of GWA studies for adiponectin in 7827 individuals, followed by two stages of replications in 4298 and 5954 additional individuals. We identified a novel adiponectin-associated locus on chromosome 10 near <I>WDR11-FGFR2</I> (<I>P</I> = 3.0 × 10<SUP>−14</SUP>) and provided suggestive evidence for a locus on chromosome 12 near <I>OR8S1-LALBA</I> (<I>P</I> = 1.2 × 10<SUP>−7</SUP>). Of the adiponectin-associated loci previously described, we confirmed the association at <I>CDH13</I> (<I>P</I> = 6.8 × 10<SUP>−165</SUP>), <I>ADIPOQ</I> (<I>P</I> = 1.8 × 10<SUP>−22</SUP>), <I>PEPD</I> (<I>P</I> = 3.6 × 10<SUP>−12</SUP>), <I>CMIP</I> (<I>P</I> = 2.1 × 10<SUP>−10</SUP>), <I>ZNF664</I> (<I>P</I> = 2.3 × 10<SUP>−7</SUP>) and <I>GPR109A</I> (<I>P</I> = 7.4 × 10<SUP>−6</SUP>). Conditional analysis at <I>ADIPOQ</I> revealed a second signal with suggestive evidence of association only after conditioning on the lead SNP (<I>P</I><SUB>initial</SUB> = 0.020; <I>P</I><SUB>conditional</SUB> = 7.0 × 10<SUP>−7</SUP>). We further confirmed the independence of two pairs of closely located loci (<2 Mb) on chromosome 16 at <I>CMIP</I> and <I>CDH13</I>, and on chromosome 12 at <I>GPR109A</I> and <I>ZNF664</I>. In addition, the newly identified signal near <I>WDR11-FGFR2</I> exhibited evidence of association with triglycerides (<I>P</I> = 3.3 × 10<SUP>−4</SUP>), high density lipoprotein cholesterol (HDL-C, <I>P</I> = 4.9 × 10<SUP>−4</SUP>) and body mass index (BMI)-adjusted waist–hip ratio (<I>P</I> = 9.8 × 10<SUP>−3</SUP>). These findings improve our knowledge of the genetic basis of adiponectin variation, demonstrate the shared allelic architecture for adiponectin with lipids and central obesity and motivate further studies of underlying mechanisms.</P>
Wu, Xue-Chang,Chen, Wei-Feng,Qian, Chao-Dong,Li, Ou,Li, Ping,Wen, Yan-Ping The Microbiological Society of Korea 2007 The journal of microbiology Vol.45 No.6
A new antagonistic strain of actinomycete, designated AP19-2, was isolated from the feces of giant pandas inhabiting the Foping National Nature Reserve in China. Cultural characteristic studies strongly suggested that this strain is a member of the genus Streptomyces. The nucleotide sequence of the 16S rRNA gene of strain AP19-2 evidenced profound similarity (97-99 %) with other Streptomyces strains. Two pure active molecules were isolated from a fermentation broth of Streptomyces sp. strain AP19-2 via extraction, concentration, silica gel G column chromatography, and HPLC. The chemical structures of the two related compounds (referred to as chromomycin $A_2$ and chromomycin $A_3$) were established on the basis of their Infrared spectra (IR), High Resolution Electrospray Ionization Mass Spectrometry (HR-ESI-MS), and Nuclear Magnetic Resonance (NMR) data, and by comparison with published data.
Iterative Symbol Decoding of Variable-Length Codes with Convolutional Codes
Wu, Hung-Tsai,Wu, Chun-Feng,Chang, Wen-Whei The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.1
In this paper, we present a symbol-level iterative source-channel decoding (ISCD) algorithm for reliable transmission of variable-length codes (VLCs). Firstly, an improved source a posteriori probability (APP) decoding approach is proposed for packetized variable-length encoded Markov sources. Also proposed is a recursive implementation based on a three-dimensional joint trellis for symbol decoding of binary convolutional codes. APP channel decoding on this joint trellis is realized by modification of the Bahl-Cocke-Jelinek-Raviv algorithm and adaptation to the non-stationary VLC trellis. Simulation results indicate that the proposed ISCD scheme allows to exchange between its constituent decoders the symbol-level extrinsic information and achieves high robustness against channel noises.