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( Zhiyong Liu ),( Yinghua Wang ),( Lizhong Song ),( Yinyin Wang ),( Fusheng Dai ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.1
In this paper, we propose a joint adaptive combining and variable tap-length multiuser detector (MUD) for amplify-and-forward (AF) underwater acoustic cooperative interleave-division multiple access (IDMA) communication system. The proposed MUD jointly realizes tap-length adjustment, adaptive combining, and multiuser detection. In contrast to the existing methods, the proposed detector can adaptively combine the received signals from different nodes at destination, and does not need the assumption that full and perfect channel state information (CSI) of all the links at the receiver is known. Moreover, the proposed detector can adaptively adjust the tap coefficient vector and tap-length of each branch according to the specific channel profile of each branch. Simulation results validate the feasibility and show the advantages of the proposed detector against existing counterparts.
Robust Optimal Trajectory Design by Integrating Genetic Algorithm with Min-Max Method
Jianmei Song,Xianxiang Chen,Zhiyong Liu,Jing Zhang 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.5
A robust optimal trajectory design method is proposed in this paper. Genetic Algorithm (GA) is employed to optimize the whole trajectory to improve the terminal attack performance. To enhance the robustness of the trajectory to disturbances, the min-max method is integrated into the GA optimization process. The proposed approach is carefully illustrated with the robust optimization de-sign of the trajectory for a portable short-range top-attack (PSRTA) missile. The H∞ robust gain-scheduled technique is used to design the attitude tracking autopilot to facilitate the trajectory design. The damp feedback loop of the weakly-damped missile body is innovatively treated as the Linear Pa-rameter Varying system (the controlled plant), which is good for practical use. The proposed robust op-timal trajectory design method and the H∞ robust gain-scheduled attitude tracking autopilot are demonstrated to be effective from the whole trajectory simulation results of the PSRTA missile, which also exhibit high applicability for practical engineering problems.
Shumei Song,Tianlin Yang,Yanqing Xin,Lili Jiang,Yanhui Li,Zhiyong Pang,Maoshui Lv,Shenghao Han 한국물리학회 2010 Current Applied Physics Vol.10 No.2
The GZO/Ag/GZO sandwich films were deposited on glass substrates by RF magnetron sputtering of Gadoped ZnO (GZO) and ion-beam sputtering of Ag at room temperature. The effect of GZO thickness and annealing temperature on the structural, electrical and optical properties of these sandwich films was investigated. The microstructures of the films were studied by X-ray diffraction (XRD). X-ray diffraction measurements indicate that the GZO layers in the sandwich films are polycrystalline with the ZnO hexagonal structure and have a preferred orientation with the c-axis perpendicular to the substrates. For the sandwich film with upper and under GZO thickness of 40 and 30 nm, respectively, it owns the maximum figure of merit of 5.3 × 10-2 Ω-1 with a resistivity of 5.6 × 10-5 Ω cm and an average transmittance of 90.7%. The electrical property of the sandwich films is improved by post annealing in vacuum. Comparing with the as-deposited sandwich film, the film annealed in vacuum has a remarkable 42.8% decrease in resistivity. The sandwich film annealed at the temperature of 350 ℃ in vacuum shows a sheet resistance of 5 Ω/sq and a transmittance of 92.7%, and the figure of merit achieved is 9.3 × 10-2 Ω-1.
Lai Nar Tung,Senchuan Song,Kin Tak Chan,Mei Yuk Choi,Ho Yu Lam,Chung Man Chan,Zhiyong Chen,Hector K. Wang,Hoi Ting Leung,Simon Law,Yanmin Huang,Huacan Song,Nikki P. Lee 대한암학회 2018 Cancer Research and Treatment Vol.50 No.4
Purpose Tumor xenograft model is an indispensable animal cancer model. In esophageal squamous cell carcinoma (ESCC) research, orthotopic tumor xenograft model establishes tumor xenograft in the animal esophagus, which allows the study of tumorigenesis in its native microenvironment. Materials and Methods In this study, we described two simple and reproducible methods to develop tumor xenograft at the cervical or the abdominal esophagus in nude mice by direct injection of ESCC cells in the esophageal wall. Results In comparing these two methods, the cervical one presented with more clinically relevant features, i.e., esophageal stricture, body weight loss and poor survival. In addition, the derived tumor xenografts accompanied a rapid growth rate and a high tendency to invade into the surrounding structures. This model was subsequently used to study the anti-tumor effect of curcumin, which is known for its potential therapeutic effects in various diseases including cancers, and its analogue SSC-5. SSC-5 was selected among the eight newly synthesized curcumin analogues based on its superior anti-tumor effect demonstrated in an MTT cell proliferation assay and its effects on apoptosis induction and cell cycle arrest in cultured ESCC cells. Treatment of orthotopic tumor-bearing mice with SSC-5 resulted in an inhibition in tumor growth and invasion. Conclusion Taken together, we have established a clinically relevant orthotopic tumor xenograft model that can serve as a preclinical tool for screening new anti-tumor compounds, e.g., SSC-5, in ESCC.
Xu Xu,Jia Song,Ke Wang,YingChun Gu,Feng Luo,XiaoHai Tang,Ping Xie,ZhiYong Qian 한국고분자학회 2013 Macromolecular Research Vol.21 No.8
In this paper, a novel biodegradable and pH/thermo-sensitive hydrogel based on poly(ε-caprolactone),methoxyl poly(ethylene glycol), methylacrylic acid and N-isopropylacrylamide was prepared by UV-initiated free radical polymerization. The hydrogels were characterized by Fourier transforms infrared ray. The thermal responsibility was investigated with the help of differential scanning calorimetry. Swelling behavior in aqueous medium with different pH value was studied in detail. When the pH value of the aqueous medium was increased from 1.2 to 7.2,the swelling ratio of the hydrogels increased accordingly. The morphology was observed by scanning electron microscopy, and the hydrolytic degradation behavior in different aqueous media (pH 1.2 and pH 7.2) was also investigated in detail. The prepared biodegradable pH/thermo-sensitive hydrogel based on poly(ε-caprolactone), methoxyl poly(ethylene glycol), methylacrylic acid and N-isopropylacrylamide hold great promise in the development of a smart drug delivery system.
( Yueheng Mao ),( Bin Song ),( Zhiyong Zhang ),( Wenhou Yang ),( Yu Lan ) 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.5
In recent years, the rapid development of social networks has led to a rapid increase in the amount of information available on the Internet, which contains a large amount of sensitive information related to pornography, politics, and terrorism. In the aspect of sensitive image detection, the existing machine learning algorithms are confronted with problems such as large model size, long training time, and slow detection speed when auditing and supervising. In order to detect sensitive images more accurately and quickly, this paper proposes a multi-classification sensitive image detection method based on lightweight Convolutional Neural Network. On the basis of the EfficientNet model, this method combines the Ghost Module idea of the GhostNet model and adds the SE channel attention mechanism in the Ghost Module for feature extraction training. The experimental results on the sensitive image data set constructed in this paper show that the accuracy of the proposed method in sensitive information detection is 94.46% higher than that of the similar methods. Then, the model is pruned through an ablation experiment, and the activation function is replaced by Hard-Swish, which reduces the parameters of the original model by 54.67%. Under the condition of ensuring accuracy, the detection time of a single image is reduced from 8.88ms to 6.37ms. The results of the experiment demonstrate that the method put forward has successfully enhanced the precision of identifying multi-class sensitive images, significantly decreased the number of parameters in the model, and achieved higher accuracy than comparable algorithms while using a more lightweight model design.
Yang, Jie,Gao, Yan,Kim, Jeoung Woo,He, Yujian,Song, Rui,Ahn, Chi Won,Tang, Zhiyong Royal Society of Chemistry 2010 Physical chemistry chemical physics Vol.12 No.38
<P>A partial cation exchange reaction between CdTe nanoparticles and Bi<SUP>3+</SUP> ions gives rise to spontaneous formation of two-dimensional Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets. The average size and thickness of the nanosheets are around 200 and 6.9 nm, respectively. Both CdTe and Bi<SUB>2</SUB>Te<SUB>3</SUB>, which are there as the form of nanoparticles with average sizes of 3.4 nm, are found to be homogenously distributed in the nanosheets. The Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets are further integrated into a pellet by using spark plasma sintering for optimizing thermoelectric performance. Compared with the bulk n-type Bi<SUB>2</SUB>Te<SUB>3</SUB>, the pellets composed of Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets exhibit a considerably low thermal conductivity, 0.63 W m<SUP>−1</SUP> K<SUP>−1</SUP>, and a slightly high Seebeck coefficient, −182.2 μV K<SUP>−1</SUP>, at room temperature.</P> <P>Graphic Abstract</P><P>Two-dimensional Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets are prepared through a self-reorganization strategy, and they show a rather high thermoelectrical performance. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cp00079e'> </P>
Dong Xie,Jiexiong Ding,Fumin Liu,Zhong Jiang,Li Du,Wei Wang,Zhiyong Song 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
The complex surface machining quality is related to the capacity of the control system, servo drive and mechanical transmission infive-axis CNC machining. The unsuitable parameters result in surface contour errors and other processing abnormal phenomena such astool marks and corrugated surface. In this paper a twisted ruled surface in flank milling is analyzed. The construction features of surfaceand the tool path characteristic of the specimen are listed. The surface cutting velocity is deduced considering the constraints of the acceleration,jerk and other control parameters and the smoothness is modeled. The individual tracking error acquired from servo feed systemmodel is converted to the contour error by homogeneous transformation matrix and Frenet frame, and abnormal tool marks in flank millingare suggested. The cutting experiments conform to simulation; the effect of the dynamic indicators of the CNC machine tool is exploredby the abnormal marks on the machined parts. This approach provides a support for designing specimens and investigating machinetool dynamics performance in working accuracy test.
Guoling Wu,Zhongjie Yang,Tianlin Zhang,Yali Sun,Chang Long,Yaru Song,Shengbin Lei,Zhiyong Tang 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.8
As an environmentally friendly oxidant, H2O2 is widely utilized in various fields; however, its production methods remain limited to the chemical anthraquinone process. Alternatively, electrocatalytic oxygen reduction possesses numerous notable advantages (e.g., cost-effectiveness, small-scale, and distributed nature). As electrocatalytic oxygen reduction has been widely investigated in the fields of fuel cells and metal-air batteries, the mechanism of the 2e?-ORR pathway for producing H2O2 is not sufficiently clear. Herein, we explore the effect of the cobalt (Co) coordination environment on the electrochemical production of H2O2. The detailed investigation on N-, P-, and S-coordinated Co catalysts (Co1N1N3, Co1P1N3, and Co1S1N3) demonstrates that changing the coordination environment evidently affects the H2O2 selectivity, and the S-coordinated Co exhibits the best catalytic performance. This finding would lead to the design and selection of catalysts at atomic level for producing H2O2 via electrocatalytic oxygen reduction.