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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>
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.
Zhiyou Zhou,Yiyan Luo,Shuaiying Peng,Qinghua Zhang,Zhi Li,Hanguang Li 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.2
To obtain native strains to efficiently use puerariae slag (PS) hydrolysate and resistant butanol toxicity, a self-designed isolation method was adopted. With this effort, the strain YBS3 was obtained. Based on 16S rDNA comparison, the strain YBS3 was identified as Clostridium beijerinckii. The feasibility of using PS hydrolysate as substrate to produce butanol was evaluated. A significant phase shift delay was encountered in acetonebutanol- ethanol (ABE) fermentation process, and then leaded to low production and productivity of butanol. However, when the C/N ratio regulation strategy was performed at mid-logarithmic phase, the problem of the phase shift delay was smoothly solved and the yield and productivity of butanol was improved. Specifically, the final production and productivity of butanol were 9.75 ± 0.14 g/L and 0.18 g/(L·h), respectively, which was 46.40% and 125.00% higher than without C/N ratio regulation. This study confirms that the accelerating phase shift is a convenient but effective approach, thereby is a promising technology for improving ABE fermentation performance.
Changlong Yin,Yiyan Wang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4
Oxidic unsupported Ni-Mo-W catalysts were chosen to elucidate the effect of sulfidation conditions on the catalytic performance. The catalysts were sulfided in situ by using dimethyl sulfide as sulfiding agent. The relationships between the time needed for sulfidation and the sulfiding conditions were studied by GC-analysis method. Straight-run gas oil with high sulfur and nitrogen content was used to evaluate the hydrotreating performance. The oxidic catalyst precursors and sulfided catalysts were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). With increasing sulfiding liquid hourly space velocity (LHSV) of the sulfiding agent, the reaction time necessary for the sulfidation decreased, while the activity of the catalyst increased significantly. The higher catalytic activity might be due to the MoS2/WS2 slabs with shorter length and higher stacking number, which might contribute to the catalyst with more active sites. Sulfiding at 330 oC took the longest sulfidation time, while the catalytic activity was also the highest after sulfiding at this temperature. Furthermore, within a certain range, the sulfidation pressure had no evident effect on the catalytic behavior or activity. The purpose of this work was to provide a basis for actual production and a reference for further research.
Experimental and analytical study on continuous GFRP concrete decks with steel bars
Zhaojie Tong,Yiyan Chen,Qiao Huang,Xiaodong Song,Bingqing Luo,Xiang Xu 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.6
A hybrid bridge deck is proposed, which includes steel bars, concrete and glass-fiber-reinforced-polymer (GFRP) plates with channel sections. The steel bar in the negative moment region can increase the flexural stiffness, improve the ductility, and reduce the GFRP ratio. Three continuous decks with different steel bar ratios and a simply supported deck were fabricated and tested to study the mechanical performance. The failure mode, deflection, strain distribution, cracks and support reaction were tested and discussed. The steel bar improves the mechanical performance of continuous decks, and a theoretical method is proposed to predict the deformation and the shear capacity. The experimental results show that all specimens failed with shear failure in the positive moment region. The increase of steel bar ratio in the negative moment region can achieve an enhancement in the flexural stiffness and reduce the deflection without increasing GFRP. Moreover, the continuous deck can achieve a yield load, and the negative moment can be carried by GFRP plates after the steel bar yields. Finally, a nonlinear analytical method for the deflection calculation was proposed and verified, with considering the moment redistribution, non-cracked sections and nonlinearity of material. In addition, a simplified calculation method was proposed to predict the shear capacity of GFRP-concrete decks.
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.
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>
Temperature monitoring and analysis of a long-span cable-stayed bridge during construction period
Mei, Xiudao,Lu, Yiyan,Shi, Jing Techno-Press 2021 Structural monitoring and maintenance Vol.8 No.2
The temperature induced response of long-span cable-stayed bridge in cantilever state is significant, which is of great interest to study the temperature characteristics during construction period. A method of analyzing the eigenvalue and its extremum of daily temperature based on cubic spline function (CSF) is proposed. By setting the fixed time interval reasonably, introducing variable time interval and extracting nodes at the MinMax of daily temperature, the obtained CSF can approach the measured temperature curve with high accuracy. Based on CSF, the temperature characteristics at three levels of measuring point, section and component are analyzed in turn. The temperature monitoring data of a cable-stayed bridge with main span of 938 m and side span of steel-concrete composited box girder (CBG) during construction are analyzed. The results show that the temperature variation of steel box girder is remarkable; the steel beam of CBG is similar to steel box girder before composited, and it turns stable after composited; the influence of PE color on cable temperature is notable than that of the cable specification; as blue PE cable, the temperature difference of cable vs pylon and cable vs CBG exceed 17℃ and 13℃.
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>