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Hwang, Karam,Chung, Jong-Duk,Lee, Kibeom,Tak, Junyoung,Suh, In-Soo The Korean Society for Railway 2014 International Journal of Railway Vol.7 No.3
Subway systems have been a proved method of public transport and are widely used in major cities around the world. However, the time and cost it takes to construct such systems are very high, as it requires underground tunnels. Cities in various countries have implemented monorail systems as public railway transport as it can be more economical and quicker compared to subway systems in terms of construction. In addition, it provides more convenience towards the public as it is not affected to traffic, and also provides an aerial view of the city. However, the overall construction cost for monorail systems is still significantly high, and as a possible solution to further reduce the overall cost, implementation of ground-level stations and wireless power transfer technology has been proposed in this paper. A concept application layout of ground-level stations and wireless power transfer systems has been discussed, using the Daegu monorail Line 3 system as a simulation base. The expected cost for monorail systems implementing ground-level stations and/or wireless power transfer technology has been estimated based on literature survey, and was compared with the current construction cost of Daegu monorail system. Based on comparison, it has shown that implementation of ground-level stations are the most economical, and can be easily implemented for either starting or expanding the monorail line. Implementation of wireless power transfer technology is also economical, but is more feasible when starting a new monorail line as it requires components which will alter the configuration of the train and infrastructure.
Hwang, Karam,Cho, Jaeyong,Park, Jaehyoung,Har, Dongsoo,Ahn, Seungyoung IEEE 2019 IEEE transactions on intelligent transportation sy Vol.20 No.1
<P>Wireless power transfer (WPT) is being developed to supply electric power to electric trains, using a source coil in/on the railway track and a pick-up coil on the train. A number of benefits can be obtained by eliminating the catenary and pantograph currently used for railway electric power supply. However, the WPT employs coils, and the electromagnetic field generated by the WPT can interfere with conventional train detection methods, such as track circuits and RFID, installed on the tracks. Train position information is critical for railway operation, especially for high speed trains. This paper proposes a novel system which provides train position information using a source coil segment. It consists of onboard sensor coils, ferrite blocks designed using specific position information, and a detector. The proposed system can be implemented using the source coil and load coil of the WPT. Information about the train’s relative position is obtained by the detection of ferrite blocks distributed within the source coil segment. The train position information provided by the ferrite components is detected by onboard sensor coils and a detector. The proposed ferrite position identification (FPID) system provides accurate train position information and is not affected by WPT electromagnetic interference. The operating principles of the FPID system are presented in detail. The performance of the proposed FPID system was measured by simulations and experiments.</P>
Pickup Coil Counter for Detecting the Presence of Trains Operated by Wireless Power Transfer
Hwang, Karam,Kim, Dongwook,Har, Dongsoo,Ahn, Seungyoung IEEE 2017 IEEE SENSORS JOURNAL Vol.17 No.22
<P>An axle counter is a popularly used device for detecting passing trains. They detect train wheels by the change of the magnetic field, made by the train wheels, in a receiving coil. Wireless power transfer (WPT) systems are used to deliver tractive power to electric trains by magnetic resonance. They consist of a pickup coil onboard the train, a supply coil on the track, and related trackside electronic circuits. When a WPT system is proximate to an axle counter, the magnetic field of the WPT can produce significant electromagnetic interference, significantly affecting the performance of the axle counter. Since the WPT system is an emerging power supply system for future railways, an alternative device for detecting trains is considered necessary. A novel device called the pickup coil counter (PCC) is proposed for this purpose. Unlike the axle counter, which detects the train's wheels, the PCC detects the WPT pickup coil onboard the train using a sensor coil wound around the WPT supply coil on the track and a detection circuit in trackside equipment. The operating concept of the PCC is explained. Its detection performance was evaluated by 3-D FEM simulation and experiment, and the results are presented.</P>
Kim, Karam,Hwang, Sae Mi,Kim, Sung Min,Park, Sung Woo,Jung, Yunjae,Chung, Il Yup 한국조명·전기설비학회 2017 한국조명·전기설비학회 학술대회논문집 Vol. No.
<P>Neutrophils and eosinophils, 2 prominent granulocytes, are commonly derived from myelocytic progenitors through successive stages in the bone marrow. Our previous genome-wide transcriptomic data unexpectedly showed that genes encoding a multitude of neutrophil primary granule proteins (NPGPs) were markedly downregulated during the end period of eosinophilic terminal differentiation when cord blood (CB) cluster of differentiation (CD) 34<SUP>+</SUP> cells were induced to differentiate toward the eosinophil lineage during a 24-day culture period. Accordingly, this study aimed to examine whether NPGP genes were expressed on the way to eosinophil terminal differentiation stage and to compare their expression kinetics with that of genes encoding eosinophil-specific granule proteins (ESGPs). Transcripts of all NPGP genes examined, including proteinase 3, myeloperoxidase, cathepsin G (<I>CTSG</I>), and neutrophil elastase, reached a peak at day 12 and sharply declined thereafter, while transcript of ESGP genes including major basic protein 1 (<I>MBP1</I>) attained maximum expression at days 18 or 24. Growth factor independent 1 (<I>GFI1</I>) and CCAAT/enhancer-binding protein α (<I>C/EBPA</I>), transactivators for the NPGP genes, were expressed immediately before the NPGP genes, whereas expression of <I>C/EBPA</I>, <I>GATA1</I>, and <I>GATA2</I> kinetically paralleled that of eosinophil granule protein genes. The expression kinetics of NPGPs and ESGPs were duplicated upon differentiation of the eosinophilic leukemia cell line (EoL-1) immature eosinophilic cells. Importantly, confocal image analysis showed that CTSG was strongly coexpressed with MBP1 in differentiating CB eosinophils at days 12 and 18 and became barely detectable at day 24 and beyond. Our results suggest for the first time the presence of an immature stage where eosinophils coexpress NPGPs and ESGPs before final maturation.</P>
극단적 에너지절감형 초절전 미래 반도체소자 기술 개발 연구
조가람(Karam Cho),고은아(Eunah Ko),김소영(Soyeong Kim),박윤희(Yunhee Park),홍성은(Seongeun Hong),임지현(Jihyun Lim),이유진(Yujin Lee),황윤정(Yun Jeong Hwang),신창환(Changhwan Shin) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.11
A negative capacitor is fabricated using poly(vinylidene fluoride-trifluoroethylene) copolymer and connected in series to an a-IZO TFT (amorphous-InZnO thin film transistor). It is experimentally demonstrated that the negative capacitance of the negative capacitor can achieve super steep switching in the a-IZO TFT (i.e., a subthreshold slope from 342 mV/decade to 221 mV/decade (forward voltage sweep) and 209 mV/decade (reverse voltage sweep) at room-temperature.
An Improved 100 GHz Equivalent Circuit Model of a Through Silicon Via With Substrate Current Loop
Kibeom Kim,Karam Hwang,Seungyoung Ahn IEEE 2016 IEEE microwave and wireless components letters Vol.26 No.6
<P>This letter presents a new wideband equivalent circuit model for through silicon via (TSV) with consideration of the effective substrate current loop in silicon substrate and proximity effect on the currents in the TSV. The proposed model can accurately predict the electrical performance of the TSV at wide frequency range. The proposed model correlates well up to 100 GHz when compared to the full-wave electromagnetic simulation.</P>