VIRTUAL REALITY CITYSCAPE NAVIGATION ENABLED BY KINECT SENSING TECHNOLOGY

Zhang yiwei,Xueshihao,Kim sehwa 한국디자인학회 2015 한국디자인학회 학술발표대회 논문집 Vol.2015 No.10

An exchange bias observed in Tb/Cr/FeCo trilayers with ultrathin Cr layer at low temperature

Sun Li,Li Xiaoyan,Zhang Yiwei,Song Hengbo,Zhang Wen,Kou Zhaoxia,Zhang Dong,Liu Xiaoying,Fei Hongyang,Pan Mengmei,Zhao Zhibin,Zhai Ya 한국물리학회 2022 Current Applied Physics Vol.44 No.-

Positive exchange bias field (He) is observed in Tb/Cr (tCr)/FeCo trilayers at 5 K without cooling field, and negative He for Tb/FeCo bilayer. The negative He of Tb/FeCo implies the FM coupling at the interface due to Co and Fe dominate in the magnetization of the ferrimagnetic interlayer alloy of FeCo and Tb. With the inserting of Cr layer, this situation is broken, and the positive He implies the antiferromagnetic interlayer coupling. A peak of He = 6.0 mT for trilayers with tCr = 1.5 nm is corresponding to the minimum value of coercivity as a function of tCr at 5 K, which is used to study the effect of the cooling field (Hfc) on He as a function of temperature. It is found that Hfc of 100 mT triggers He from positive to negative at T ≤ 15 K. The magnetoresistance results also confirm the coexistence of multiple MR mechanisms in these trilayers.

Research on outlier detection algorithm for express logistics

Zhang, Yan,Li, Zheyi,Wen, Jiefeng,Ma, Yiwei,Kwon, Oh-kyoung North-Holland Pub. Co 2017 Computers in industry Vol.92 No.-

<P><B>Abstract</B></P> <P>To detect the problems of time delay, path error and destination error in express logistics process effectively, a novel outlier detection algorithm for express logistics is proposed in this paper. To test the detection results, the express logistics system operating model is built to test the detection results. Experiment results show that the proposed algorithm is well applied to the express logistics data with multi-attribute characteristics, and can work well in detecting the abnormal conditions of express logistics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> According to the characteristics and operation principle of joint distribution mode, constructing a virtual simulation system of the logistics operation model and simulating the operation process of the entire logistics activities of logistics orders from generation to the terminal distribution in joint distribution. </LI> <LI> To establish extraction method of the logistics distribution data feature based on the time, number, level, position coordinates and the urban point dependent relation, the method of describing the distribution characteristics accurately and effectively. </LI> <LI> According to the characteristics of joint distribution, put forward a kind of abnormal state detection and evaluation algorithm of logistics distribution, and identify the abnormal distribution of common delivery delay in delivery time, delivery path error, destination error (not the destination) and accurately in joint distribution. </LI> </UL> </P>

Polymorphism of Estrogen Receptor Genes and Its Interactions With Neurodevelopmental Genes in Attention Deficit Hyperactivity Disorder Among Chinese Han Descent

Yiwei Lin,Haimei Li,Jing Zhang,Ziqi Yang,Yi Zhou,Lu Liu,Qiujin Qian 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.8

Objective Attention deficit hyperactivity disorder (ADHD) is a polygenic neurodevelopmental disorder with significant gender differences. The sexual dimorphism of ADHD may be associated with estrogen acting through estrogen receptors (ESR). This study investigates the impact of <i>ESR</i> gene polymorphism and its interactions with neurodevelopmental genes on ADHD susceptibility.Methods The study compared genotyping data of single nucleotide polymorphisms in <i>ESR1</i> and <i>ESR2</i> in 1,035 ADHD cases and 962 controls. The gene-gene interactions between <i>ESR</i> genes and three neurodevelopmental genes (brain-derived neurotrophic factor [<i>BDNF</i>], synaptosomal-associated protein of 25 kDa gene [<i>SNAP25</i>], and cadherin-13 [<i>CDH13<i></i></i>]) in ADHD were investigated using generalized multifactor dimensionality reduction and verified by logistic regression analysis.Results The G allele of rs960070/<i>ESR2</i> (empirical p=0.0076) and the A allele of rs8017441/<i>ESR2</i> (empirical p=0.0426) were found significantly higher in ADHD cases than in the controls but not in male or female subgroups. Though no difference was found in all subjects or females, the A allele of rs9340817/<i>ESR1</i> (empirical p=0.0344) was found significantly higher in ADHD cases than controls in males. We also found genetic interaction models between <i>ESR2</i> gene, neurodevelopmental genes and ADHD susceptibility in males (<i>ESR2</i> rs960070/<i>BDNF</i> rs6265/<i>BDNF</i> rs2049046/<i>SNAP25</i> rs362987/<i>CDH13</i> rs6565113) and females (<i>ESR2<i></i></i> rs960070/<i>BDNF<i></i></i> rs6265/<i>BDNF</i> rs2049046) separately, though it was negative in overall subjects.Conclusion The <i>ESR</i> gene polymorphism associates with ADHD among Chinese Han children, with interactions between <i>ESR<i></i></i> genes and neurodevelopmental genes potentially influencing the susceptibility of ADHD.

Theoretical Study on the Adsorption and Decomposition of Methanol over the PtCrCu (111) Surface

Yiwei Wang,Laicai Li,Xiaoqin Zhang,Jun Du,Jianmin Guo 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.9

The density functional theory (DFT) and self-consistent periodic calculation were used to investigate methanol adsorption on the PtCrCu (111) surface. The adsorption energies, equilibrium geometries and vibration frequencies of thirteen type’s methanol adsorption models on the PtCrCu (111) surface were predicted and the favorite adsorption model for methanol is the fcc-Pt2Cr. The strong anti-poisoning ability of the optimal adsorption model fcc-Pt2Cr has been found when the catalysts resistance to carbon monoxide (CO) was explored. Furthermore, after doping of Cr and Cu atoms in Pt-based catalysts energy band has been broadened and the original peak of the d-orbital for atom Pt which was close to the Fermi level disappears, these phenomena can explain why this new ternary alloy catalyst for the enhancement of electrocatalytic activity to some extent. The rate-determining step of possible decomposition pathway was investigated with transition state searching and the calculation results show that the activation barrier of O-H bond breaking with PtCrCu (111) ternary alloy catalyst is lower than that of O-H bond breaking without catalyzer in gas phase.

Strength, deformation and failure behavior of bolted rock-like specimen with multiple cracks under uniaxial compression by particle flow simulation

Wendong Yang,Yiwei Li,Ling Wang,Kaicheng Zhang,Zhicheng Gong 한국지질과학협의회 2023 Geosciences Journal Vol.27 No.6

Most of the rock mass in nature contains a large number of joints, faults and other defects, which make the rock mass have the characteristics of discontinuity and anisotropy, and easily lead to instability and failure of rock engineering. A great quantity of engineering practices show that the bolt has a significant supporting effect on jointed rock mass. Therefore, it is of great significance to study the deformation and failure characteristics of jointed rock mass and the crack arrest effect of bolt for the safety and stability of engineering. A reasonable numerical model of bolted rock samples with non-persistent joints is established by using a three-dimensional Particle Flow Code (PFC) based on the laboratory rock specimens, and the uniaxial compression numerical test is carried out. The results indicate that (1) the numerical simulation results are in good agreement with the laboratory test results, and the variation trend of strength is basically consistent; (2) the different joint angles and anchorage angles result in variations in the mechanical properties of bolted specimens with non-persistent joints; (3) the joint angle has a significant effect on the failure mode of the specimen; (4) the existence of bolts can effectively limit the initiation and propagation process of micro-cracks, and greatly improve the mechanical properties of the specimen containing non-persistent joints.

Traditional Dual Growing Rods With 2 Different Apical Control Techniques in the Treatment of Early-Onset Scoliosis

Shengru Wang,Yiwei Zhao,Guanfeng Lin,You Du,Yang Yang,Jianguo Zhang 대한척추신경외과학회 2023 Neurospine Vol.20 No.3

Objective: Based on traditional dual growing rods (TDGR), apical control techniques (ACTs) were introduced as adjuvant procedures to improve deformity correction at the apex segment in the treatment of early-onset scoliosis (EOS). We aimed to explore whether TDGR+ ACTs have different indications, attain more deformity correction, have negative effects on spinal growth, and have different complications. Methods: Between 2004 and 2019, a retrospective study of EOS patients treated with TDGR with or without ACTs was conducted and divided into 3 groups: TDGR group; hybrid technique (HT) group: Vertebrectomy/hemivertebrectomy with short fusion and TDGR; ACPS group: apical convex control pedicle screws (ACPS) and TDGR. Demographic, radiographic parameters, clinical outcomes, complications, and revisions were analyzed and compared. Results: Seventy-eight EOS patients were enrolled. The preoperative main curve was the largest in the HT group. ACPS group had the smallest residual curve (19° ± 8.9°) and apical vertebral translation (12.0 ± 9.0 mm) at the latest follow-up, followed by the HT group (30° ± 17.4°, 22.1 ± 13.4 mm) and TDGR group (30° ± 13.2°, 32.8 ± 17.1 mm). ACPS group had the largest T1–12 height and T1–S1 height after index surgery. Complications and revisions in the ACTs groups was lower than the TDGR group. Scoliosis Research Society-22 self-image questionnaire was superior in the ACPS group. Conclusion: According to our intermediate results, TDGR+ACTs could improve correction ability of apex deformity. ACTs had little deleterious effects on spinal height during the lengthening procedures, with a lower complication rate than TDGR. TDGR+ACTs might be a supplemental option for suitable EOS patients.

Deposit Insurance and the 2008-2009 Global Financial Crisis

Iftekhar Hasan,Yiwei Fang,Liuling Liu,Gaiyan Zhang 예금보험공사 2017 金融安定硏究 Vol.18 No.1

Our paper revisits benefits and costs of explicit deposit insurance and examines the role of deposit insurance during the 2008-2009 financial crisis period. The crisis provides an ideal setting to test whether DI achieved its intended purpose. We investigate whether DI influences banks’ ability to retain deposits, interbank market liquidity, loans granted to the industrial sectors, and fund flows across countries, in addition to the risk taking behavior, the usual focus of most studies in the literature. We find supportive evidence that deposit insurance help banks retain deposits and alleviate declines in the amount of corporate loans. It also has positive externalities in the sense that corporate loan spreads have a smaller increase when the country has explicit deposit insurance. Finally, deposit insurance mitigates the global bank’s ‘flight-to-home’ effect. The paper goes beyond examining the mere presence of a deposit insurance and investigates the role of specific deposit insurance designs, including whether DI has risk-based insurance premium, coinsurance, full coverage, ‘risk-minimizing’ arrangements, dual funding sources, and was established by government or not. Indeed, the effects are more pronounced for certain design features.

Frequency-Code Domain Contention in Multi-antenna Multicarrier Wireless Networks

Lv, Shaohe,Zhang, Yiwei,Li, Wen,Lu, Yong,Dong, Xuan,Wang, Xiaodong,Zhou, Xingming The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.2

Coordination among users is an inevitable but time-consuming operation in wireless networks. It severely limit the system performance when the data rate is high. We present FC-MAC, a novel MAC protocol that can complete a contention within one contention slot over a joint frequency-code domain. When a node takes part in the contention, it generates randomly a contention vector (CV), which is a binary sequence of length equal to the number of available orthogonal frequency division multiplexing (OFDM) subcarriers. In FC-MAC, different user is assigned with a distinct signature (i.e., PN sequence). A node sends the signature at specific subcarriers and uses the sequence of the ON/OFF states of all subcarriers to indicate the chosen CV. Meanwhile, every node uses the redundant antennas to detect the CVs of other nodes. The node with the minimum CV becomes the winner. The experimental results show that, the collision probability of FC-MAC is as low as 0.05% when the network has 100 nodes. In comparison with IEEE 802.11, contention time is reduced by 50-80% and the throughput gain is up to 200%.

Research on preprocessing of winding trajectory of composite type IV pressure vessel based on robot

Jiazhong Xu,Yiwei Xu,Yunfei Gu,Xiaobing Zhang,Hao Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12

Herein, a smooth preprocessing method of robotic end-effector trajectory, based on Nurbs curve is proposed for obtaining the complete and stable envelope trajectory of the robot. Initially, the winding pattern of pressure vessel based on non-geodesic is deduced, followed by positioning of yarn point based on doffing point distribution and preprocessing of the trajectory through Nurbs curve. Variation trend and stationarity of velocity and acceleration in carriage and cross-carriage directions in Cartesian coordinate system are analyzed. Finally, the winding experiment of type Ⅳ pressure vessel is wound with the robotic winding workstation. Results show that the fiber winding can be carried out stably by the end of the robot. The realtime movement curve of the robot is consistent with the simulation curve, and the pressure liner is completely covered without yarn sliding and overhead problems, verifying the feasibility of the as-reported preprocessing method.