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An Opinion Leaders Detecting Algorithm in Multi-relationship Online Social Networks
Weihua Zhang,Gengxin Sun,Sheng Bin 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.5
Opinion leaders in online social networks are important for a lot of applications in various fields such as public opinion propagation, marketing management, administrative science and even politics. There are often many kinds of relationships in an online social network. Detecting and identifying opinion leaders depending on any one kind of relationship is all accurate. In this paper, node importance analysis in multi-relationship online social network was proposed based on signaling spreading, and considering the characteristics of multiple relationships which would interrelate with each other. Through node importance, a novel opinion leaders detecting algorithm is proposed and approved to be efficient by experiments described in the paper.
M-ary Bi-orthogonal Modulation UWB with Narrowband Interference Suppression Capability
Weihua Zhang,Hanbing Shen,Jong Ok Joo,곽경섭 한국전자통신연구원 2008 ETRI Journal Vol.30 No.1
An M-ary bi-orthogonal modulation scheme for ultra-wideband (UWB) systems capable of narrowband interference (NBI) suppression is proposed in this letter. We utilize a set of bi-orthogonal pulse series to achieve NBI suppression. Through analysis and simulation, we verify that the proposed scheme can suppress NBIs effectively.
Impulse Series for UWB-Based Cognitive Radio System
Weihua Zhang,Hanbing Shen,Zhiquan Bai,곽경섭 한국전자통신연구원 2007 ETRI Journal Vol.29 No.4
In this letter, we propose an impulse series for an ultra-wideband-based cognitive radio system which can utilize the spectrum dynamically by controlling the impulse positions and thus reduce the system complexity.
Experimental nonlinear vibrations of an MRE sandwich plate
Zhang, Jiawei,Yildirim, Tanju,Alici, Gursel,Zhang, Shiwu,Li, Weihua Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.1
The nonlinear vibration analysis of a magneto-rheological elastomer (MRE) sandwich plate is conducted experimentally. Experiments have been performed in order to construct the frequency-response curves in the vicinity of the fundamental natural frequency of an MRE sandwich plate (plate A) in either the absence or presence of a localised external magnetic field at 3 different geometrical locations, for both small and medium magnetic fields. Furthermore, experiments have also been conducted on a pure aluminium plate (plate B) with an equal thickness to the MRE sandwich plate (plate A) in order to examine the influence of the MRE layer on the nonlinear dynamics of the system. An electrodynamic shaker was used to directly force each system and the displacement at the centre of the plate was measured. Meanwhile, permanent magnets were used to apply a localised magnetic field for the experiments where the MRE sandwich plate was subject to an external magnetic field. It was observed all the MRE systems displayed strong hardening-type nonlinear behaviour, however, with increasing magnetic field this behaviour transitioned to a weak hardening-type nonlinearity.
A Novel Task Communication and Scheduling Algorithm for NoC-based MPSoC
Weihua Zhang,Gengxin Sun,Sheng Bin 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.10
With the high performance demand, recent embedded systems are mostly based on NoC (Network-on-Chip) architectures, which would bring complex on-chip communication and scheduling problems. In this paper, a novel task scheduling algorithm which statically schedules both communication transactions and computation tasks onto heterogeneous NoC architectures under real-time constraints is presented. Our algorithm is capable of assigning tasks onto different processing elements (PE) automatically and scheduling their execution. We map tasks onto an 8× 8 NoC-based MPSoC to show that our scheduling algorithm leads to reduction in the total execution time, energy consumption. Experimental results show that for a multimedia application, more than 40% energy savings have been observed compared to the schedules generated by a standard scheduler.
Improved Delay-Locked Loop in a UWB Impulse Radio Time-Hopping Spread-Spectrum System
Weihua Zhang,곽경섭,Hanbing Shen 한국전자통신연구원 2007 ETRI Journal Vol.29 No.6
As ultra-wideband impulse radio (UWB-IR) uses shortduration impulse signals of nanoseconds, even a small number of timing errors can cause a detrimental effect on system performance. A delay-locked loop (DLL) is proposed to synchronize and reduce timing errors. The design of the DLL is vital for UWB systems. In this paper, an improved DLL is introduced to a UWB-IR timehopping spread-spectrum system. Instead of using only two central correlator branches as in a conventional DLL, the proposed system uses two additional correlator branches with different delay parameters and different weight parameters. The performance of the proposed schemes with the optimal parameters is compared with that of traditional schemes through simulation: the proposed four-branch DLLs achieves less tracking jitter or a longer mean time to lose lock (MTLL) than the conventional two-branch DLLs if proper parameters are chosen.
Zhang, Xiaodong,Tao, Qiangqiang,Shang, Jinnan,Xu, Yiliang,Zhang, Liang,Ma, Yingchun,Zhu, Weihua,Yang, Min,Ding, Yueyun,Yin, Zongjun Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.4
Objective: Apoptosis of ovarian granulosa cells (GCs) affects mammalian follicular development and fecundity. This study aimed to explore the regulatory relationship between microRNA-26a (miR-26a) and the 3β-hydroxysteroid-Δ24-reductase gene (DHCR24) gene in porcine follicular granular cells (pGCs), and to provide empirical data for the development of methods to improve the reproductive capacity of pigs. Methods: The pGCs were transfected with miR-26a mimic, miR-26a inhibitor and DHCR24-siRNA in vitro. The cell apoptosis rate of pGCs was detected by the flow cytometry. The secretion levels of estradiol (E2) and progesterone (P) in pGCs were detected by enzyme-linked immunosorbent assay. Double luciferase validation system was used to detect the binding sites between miR-26a and DHCR24 3'-UTR region. Qualitative real-time polymerase chain reaction and Western blotting were used to verify the DHCR24 mRNA and protein expression in pGCs, respectively, after transfecting with miR-26a mimic and miR-26a inhibitor. Results: Results showed that enhancement of miR-26a promoted apoptosis, and inhibited E2 and P secretion in pGCs. Meanwhile, inhibition of DHCR24 also upregulated the Caspase-3 expression, reduced the BCL-2 expression, promoted pGCs apoptosis, and inhibited E2 and P secretion in pGCs. There were the binding sites of miR-26a located within DHCR24 3'-UTR. Up-regulation of miR-26a inhibited DHCR24 mRNA and protein expression in pGCs. Conclusion: This study demonstrates that miR-26a can promote cell apoptosis and inhibit E2 and P secretion by inhibiting the expression of DHCR24 in pGCs.
Facile, Efficient Liquid Exfoliated Cyanoethylated Cellulose Nanofibrils and Their Application
Weihua Zhang,Mingjie Li,Chunlin Xu,Chaoxu Li 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Traditionally, cellulose nanofibers are difficult to disperse in organic solvent and redisperse after drying, and thereby limit their practical applications. Herein, we develop a new, convenient, scalable and energy efficient method for producing cyanoethylated cellulose nanofibers. Through the synergy of mechanical and chemical reaction processes, the produced cyanoethylated cellulose nanofibers are ca. 3 nm wide and several hundred to 1000 nanometers long. Particularly, compared with common TEMPO oxidized cellulose nanofibrils, they show improved hydrophobicity and redispersibility in different organic solvent. In addition, these dispersed CCNFs also exhibit greater potential to construct high-performance structural materials, e.g., transparent ductile nanopapers with large elongation up to 18% and toughness as high as 16.5 MJ/m³.