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Wu, Yiyan,Zhao, Zhenglin,Yang, Yupeng,Yang, Xudong,Jang, Eun Young,Schilaty, Nathan D,Hedges, David M,Kim, Sang Chan,Cho, Il Je,Zhao, Rongjie Chinese Medical Assn 2014 Chinese medical journal : CMJ Vol.127 No.10
<P>We previously demonstrated that the aqueous extract of the Schizandra chinensis fruit (AESC) ameliorated Cd-induced depletion of monoamine neurotransmitters in the brain through antioxidant activity. In the present study, we investigated the effect of AESC on anxiety-like behavior and the levels of norepinephrine and 3-methoxy-4-hydroxy-phenylglycol (a metabolite of norepinephrine) in different brain regions during ethanol withdrawal in rats.</P>
Comparison of ATSC 8-VSB and DVB-T COFDM DTTB Systems
김진업,오길남,Yiyan Wu 에스케이텔레콤 (주) 1998 Telecommunications Review Vol.8 No.2
This paper compares the performances of the ATSC 8-VSB and the DVB-T COFDM modulation systems for DTTB (Digital Television Terrestrial Broadcasting). A general system level comparison is presented first, followed by the comparison of the most recent laboratory test results. Then a calculated performance comparison of 8-VSB and COFDM based on 6MHz channel spacing is provided. Finally, a short performance and implementation analysis for the two modulation systems under different network infrastructures is presented.
Layered-Division Multiplexing: An Enabling Technology for Multicast/Broadcast Service Delivery in 5G
Zhang, Liang,Wu, Yiyan,Li, Wei,Salehian, Khalil,Lafleche, Sebastien,Wang, Xianbin,Park, Sung Ik,Kim, Heung Mook,Lee, Jae-young,Hur, Namho,Angueira, Pablo,Montalban, Jon Institute of Electrical and Electronics Engineers 2018 IEEE communications magazine Vol.56 No.3
<P>Future 5G systems will include a point-to-multipoint (P2MP) transmission mode to achieve high capacity and high spectrum efficiency for multiple use cases, such as IoT, lifeline communications, and broadcast-type services. Layered-division-multiplexing (LDM) is a novel non-orthogonal multiplexing technology recently adopted by the next generation digital TV broadcast system, ATSC 3.0, which is capable of providing significant capacity improvement when delivering multiple broadcast services simultaneously. This article explores the application of LDM as an enabling technology for 5G to achieve high-efficiency P2MP transmission and to deliver more diversified broadcast-type services using the mobile broadband infrastructure. The potential advantages that can be offered by LDM are demonstrated by capacity analysis and computer simulations. Coverage studies show that a 5G P2MP subsystem with LDM can deliver high-quality broadcast services using the broadband infrastructure. Finally, some general guidelines on the receiver implementation are presented to minimize the hardware complexity of consumer devices.</P>
Zhang, Liang,Wu, Yiyan,Li, Wei,Rong, Bo,Salehian, Khalil,Lafleche, Sebastien,Wang, Xianbin,Park, Sung Ik,Kim, Heung Mook,Lee, Jae-young,Hur, Namho,Angueira, Pablo,Montalban, Jon Institute of Electrical and Electronics Engineers 2019 IEEE wireless communications Vol.26 No.2
<P>LDM, a non-orthogonal multiplexing technology, is one of the main innovations in ATSC 3.0, a next generation terrestrial TV broadcast system. This article gives a general overview of the LDM technology, its current applications in the ATSC 3.0 system, and its cost in terms of the required additional complexity. The transmission capacity benefit offered by LDM is explained by theoretical analysis and demonstrated by simulation results. An efficient implementation scheme is described with less than 15 percent complexity increase. New service coverage paradigms enabled by LDM are presented. Finally, more future innovative applications of LDM, along with their benefits and challenges, are introduced. These include using LDM for wireless in-band backhaul, combining LDM with scalable video coding, and the application of LDM in other future broadcasting and 4G/5G broadband systems.</P>
Mingjin Zhang,Yiyan Dai,Bo Hu,Xu Xin,Lianhuo Wu,Yongle Li 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.9
Bridges in mountainous areas are indispensable nodes in transportation networks, and wind resistance capabilities have become a controlling factor of long-span bridges built in mountain areas. Therefore, it is necessary to study the characteristics of wind fields under complex terrain. An improved inlet boundary by fitting the boundary curve was proposed in this study. The inlet fluctuating wind field was generated by the Correlation Improved Random Flow Generation method (CIRFG). The results of the numerical simulations show that the fluctuating wind input generated by CIRFG tallies with the target wind field, which proves the reliability of the proposed method. The method of fitting boundary curves to give inlet wind speed profiles can achieve non-uniform wind profile inputs. The results show the wind direction of the gorge varies significantly by height. The wind speed at the summit will accelerate affected by the terrain. Also influenced by the terrain, the turbulence intensity profiles in the simulated area show an S-shape. The transverse wind and angle of attack are uneven along the main girder, especially near slopes. The conclusions obtained in the study can provide references for the wind resistance of bridges built in mountainous areas.
Sung Ik Park,Yiyan Wu,Heung Mook Kim,Namho Hur,Jeongchang Kim [Institute of Electrical and Electronics Engineers 2014 IEEE transactions on broadcasting Vol.60 No.2
<P>This paper proposes a class of raptor-like rate compatible low-density parity check (LDPC) codes for the cloud transmission (CTxN) system. The proposed LDPC codes have lengths of 16,200 and 64,800 which are the same as those of DVB T2/S2 LDPC codes so that the CTxn system can easily be combined with the DVB-T2/S2 system for a second layer service. As the proposed LDPC codes are optimized at low coding rate range (R <;1/2), their performance is not only close to the Shannon limit, but also better than the DVB-T2/S2 LDPC codes. Moreover, the proposed LDPC codes have raptor code's property so that they can be decoded with a punctured codeword at the receiver for power saving and less latency under high signal-to-noise ratio regions.</P>
Sung Ik Park,Yiyan Wu,Heung Mook Kim,Sunhyoung Kwon,Liang Zhang,Namho Hur,Jeongchang Kim [Institute of Electrical and Electronics Engineers 2015 IEEE transactions on broadcasting Vol.61 No.1
<P>In this paper, we propose a two dimensional (2-D) code based on a vertical low-density parity check (LDPC) code and a horizontal Reed-Solomon code for the cloud transmission system. The proposed 2-D code shows superior performance under fading channels due to its inherent block-type interleaving feature. Furthermore, the proposed 2-D code can be adaptively decoded to reduce decoding latency and complexity because the vertical LDPC code has raptor-like rate-compatible feature.</P>
Signal Cancellation Techniques for RF Watermark Detection in an ATSC Mobile DTV System
Bo Rong,Sung Ik Park,Yiyan Wu,Heung Mook Kim,Jeongchang Kim,Gagnon, G.,Xianbin Wang IEEE 2011 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY Vol.60 No.8
<P>The popularity of Advanced Television System Committee (ATSC) mobile digital television (DTV) [mobile/handheld (M/H)] cultivates a fast growing demand on transmitter identification (TxID) in a mobile environment. The ATSC A/110 standard addresses this need with a TxID system using a radio-frequency (RF) watermark. This paper studies the use of DTV signal cancellation techniques in RF watermark detection. In particular, we develop two schemes, namely, decision feedback convolution and decision feedback equalizer (DFE) decision-directed (DD) error, to meet different application scenarios. The first scheme is designed for static and slow-fading channels, whereas the second scheme is designed for dynamic and fast-fading channels. We have conducted computer simulation on TxID over various channel conditions to evaluate the performance of our schemes. Numerical results show that DTV signal cancellation can significantly boost the signal-to-noise (SNR) level of RF watermark and thus reinforce TxID in a mobile environment.</P>
Korean Red Ginseng attenuates anxiety-like behavior during ethanol withdrawal in rats
Zhao, ZhengLin,Kim, Young Woo,Wu, YiYan,Zhang, Jie,Lee, Ju-Hee,Li, XiaoHua,Cho, Il Je,Park, Sang Mi,Jung, Dae Hwa,Yang, Chae Ha,Kim, Sang Chan,Zhao, RongJie The Korean Society of Ginseng 2014 Journal of Ginseng Research Vol.38 No.4
Background: Korean Red Ginseng (KRG) is known to have antianxiety properties. This study was conducted to investigate the anxiolytic effects of KRG extract (KRGE) during ethanol withdrawal (EW) and the involvement of the mesoamygdaloid dopamine (DA) system in it. Methods: Rats were treated with 3 g/kg/d of ethanol for 28 d, and subjected to 3 d of withdrawal. During EW, KRGE (20 mg/kg/d or 60 mg/kg/d, p.o.) was given to rats once/d for 3 d. Thirty min after the final dose of KRGE, anxiety-like behavior was evaluated in an elevated plus maze (EPM), and plasma corticosterone (CORT) levels were determined by a radioimmunoassay (RIA). In addition, concentrations of DA and 3,4-dihydroxyphenylacetic acid (DOPAC) in the central nucleus of the amygdala (CeA) were also measured by high performance liquid chromatography (HPLC). Results: The EPM test and RIA revealed KRGE inhibited anxiety-like behavior and the over secretion of plasma CORT during EW. Furthermore, the behavioral effect was blocked by a selective DA D2 receptor (D2R) antagonist (eticlopride) but not by a selective DA D1 receptor (D1R) antagonist (SCH23390). HPLC analyses showed KRGE reversed EW-induced decreases of DA and DOPAC in a dose-dependent way. Additionally, Western blotting and real-time polymerase chain reaction (PCR) assays showed that KRGE prevented the EW-induced reductions in tyrosine hydroxylase (TH) protein expression in the CeA and TH mRNA expression in the ventral tegmental area (VTA). Conclusion: These results suggest that KRGE has anxiolytic effects during EW by improving the mesoamygdaloid DA system.