An OVSF Code Based Routing Protocol for Clustered Wireless Sensor Networks

Yangyang Wang,Xiaoling Wu,Jin Wang,Weiping Liu,Weimin Zheng 보안공학연구지원센터 2012 International Journal of Future Generation Communi Vol.5 No.3

Research on Magnetic Field of Multistage Counter Roll Magnetorheological Fluid Transmission Device

Xiangfan Wu,Yangyang Guo,Zuzhi Tian,Fangwei Xie,Yujie Tang 한국자기학회 2022 Journal of Magnetics Vol.27 No.2

Aiming to solve the problem of magnetorheological transmission heat dissipation, a novel magnetorheological fluid transmission device is designed, and the torque of the device is analyzed. Based on electromagnetic theory, the magnetic circuit of the device is designed. The finite element method is used to simulate the magnetic field of the measurement device. Results show that the working magnetic induction can reach 0.5 T when the current is 1.6 A, which can meet design requirements. The magnetic induction intensity in the working space increases with the increase of the excitation current and permeability of the magnetic conductive material; decreases with the increase of the size of the working space; and increases with the increase of the size of the magnetic ring. The magnetic induction intensity in the working area is DT4C, 20 steel, and 45 steel from strong to weak. The experimental results are consistent with the simulation.

M-DOF dynamic model for load sharing behavior analysis of PGT

Huimin Dong,Yangyang Wu,Delun Wang,Shaoping Bai 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.3

A Multi-degree-of-freedom (M-DOF) nonlinear dynamic model for n-pinion Planetary gear train (PGT) is presented in this paper to investigate load sharing behavior of planet gears. In this dynamic model, manufacturing and assembly errors, elastic deformation and time-varying mesh stiffness are considered. Two sets of elastic compatibility equations are proposed to describe compatibility relationship between displacements, errors and elastic deformations. By means of Ishikawa formula, time-varying mesh stiffness of the gear pair is determined. The dynamic motion equations are solved with Runge-Kutta numerical integral method, which yields the displacements and deformations of each component. With the model, dynamic load sharing behavior of planet gears is evaluated. An example of 3-pinion PGT dynamic modeling is included, for which the influence of floating sun gear and adding flexible planet pin on the load sharing characteristics is analyzed.

Anti-inflammation compounds from the seedpods of Pongamia pinnata (L.) Pierre guided by the bioactivity and UPLCHRESIMS

Hong Guo,Zisong Bai,Yangyang Xu,Xueqin Wu,Ning Li,Yan Zhu,Xiaoming Wang,Peng Zhang 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.7

Pongamia pinnata (Linn.) Pierre has anti-inflammatory activity and could significantly decrease serum tumor necrosis factor-a and IL-10 in arthritic rats. Previous research indicated the typical chemical constituent in P. pinnata is furanoflavone. Guided by anti-inflammatory active assay and UPLC-HRESIMS chromatography, 22 compounds were isolated from the ethanol extract of P. pinnata seedpods. One novel furanoflavone, 40-hydroxypinnatin, was elucidated by HRESIMS, 1D- and 2D-NMR spectra. The 21 known compounds, including 9 furanoflavone, were identified by comparing their NMR data with the previous data in reference. In the known compounds, 5 were isolated for the first time from the species. The anti-inflammatory activities were assayed by assessing LPS-induced NO production in BV-2 cells. 12 compounds can inhibit the production of NO without cytotoxicity at concentration of 50 lM. Among them, compounds 4 can significantly inhibit the production of NO, with the IC50 value of 31.36 lM.

Population-Stratified Analysis of Bone Mineral Density Distribution in Cervical and Lumbar Vertebrae of Chinese from Quantitative Computed Tomography

Yong Zhang,Zhuang Zhou,Cheng’ai Wu,Danhui Zhao,Chao Wang,Xiaoguang Cheng,Wei Cai,Ling Wang,Yangyang Duanmu,Chenxin Zhang,Wei Tian 대한영상의학회 2016 Korean Journal of Radiology Vol.17 No.5

Objective: To investigate the bone mineral density (BMD) of cervical vertebrae in a population-stratified manner and correlate with that of the lumbar vertebrae. Materials and Methods: Five hundred and ninety-eight healthy volunteers (254 males, 344 females), ranging from 20 to 64 years of age, were recruited for volumetric BMD (vBMD) measurements by quantitative computed tomography. Basic information (age, height, weight, waistline, and hipline), and vBMD of the cervical and lumbar vertebrae (C2–7 and L2–4) were recorded. Comparisons among sex, age groups and different levels of vertebrae were analyzed using analysis of variance. Linear regression was performed for relevance of different vertebral levels. Results: The vBMD of cervical and lumbar vertebrae was higher in females than males in each age group. The vBMD of the cervical and lumbar vertebrae in males and the vBMD of lumbar vertebrae in females decreased with aging. In each age group, the vBMD of the cervical vertebrae was higher than that of the lumbar vertebrae with gradual decreases from C2 to C7 except for C3; moreover, the vBMD of C6 and C7 was significantly different from that of C2–5. Correlations of vBMD among different cervical vertebrae (females: r = 0.62–0.94; males: r = 0.63–0.94) and lumbar vertebrae (males: r = 0.93–0.98; females: r = 0.82–0.97) were statistically significant at each age group. Conclusion: The present study provided normative data of cervical vertebrae in an age- and sex-stratified manner. Sex differences in vBMD prominently vary with age, which can be helpful to design a more comprehensive pre-operative surgical plan.

Recent trends in therapeutic strategies for repairing endometrial tissue in intrauterine adhesion

Junyan Ma,Hong Zhan,Wen Li,Liqi Zhang,Feng Yun,Ruijin Wu,Jun Lin,Yangyang Li 한국생체재료학회 2021 생체재료학회지 Vol.25 No.4

Intrauterine adhesion (IUA) is a common gynaecological disease that develops from infection or trauma. IUA disease may seriously affect the physical and mental health of women of childbearing age, which may lead to symptoms such as hypomenorrhea or infertility. Presently, hysteroscopic transcervical resection of adhesion (TCRA) is the principal therapy for IUAs, although its function in preventing the recurrence of adhesion and preserving fertility is limited. Pharmaceuticals such as hormones and vasoactive agents and the placement of nondegradable stents are the most common postoperative adjuvant therapy methods. However, the repair of injured endometrium is relatively restricted due to the different anatomical structures of the endometrium. Recently, the treatment outcome of IUAs has improved with the advancement of hysteroscopic techniques. In particular, the application of bioactive scaffolds combined with tissue engineering technology has proven to have high therapeutic potential or endometrial repair in IUA treatment. Herein, this review has summarized past therapeutic strategies, including postoperative adjuvant therapy, cell or therapeutic molecular delivery therapy methods and bioactive scaffoldbased tissue engineering methods. Therefore, this review presented the recent therapeutic strategies for repairing endometrium treatment and pointed out the issues of clinical concern to provide alternative methods for the management of IUAs.

Event-trigger-based Fault-tolerant Control of Uncertain Non-affine Systems with Predefined Performance

Yang Yang,Yuwei Zhang,Zijin Wang,Xuefeng Si,Jinran Wu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2

Fault-tolerant control (FTC) of a non-affine system with uncertainties is one of critical issues in nonlinear control. In this paper, in the presence of unknown actuator failures, an event-trigger-based FTC scheme is proposed for such a nonlinear system with predefined performance. For actuator failures, a compensation mechanism is designed to alleviate their impacts. By utilizing a predefined performance function, higher tracking accuracy can be obtained. Meanwhile, an event-triggered mechanism with a time-varying threshold, depending on tracking error, reduces the number of communications for a controller-to-actuator channel. An adaptive event-triggered function is then proposed with the compensation mechanism to improve the self-adjusting ability of the triggered function. Also, extended state observers and tracking differentiators are utilized to reconstruct unknown dynamics of the system and to simplify high-order derivation of virtual control laws, respectively. The stability of the closed-loop system is analyzed by input-to-state practically stability. Finally, two simulation results are supplied to verify the effectiveness of the proposed control method.

Formation of Protein Bodies and the Response to Nitrogen in Different Positions During Wheat Endosperm Development

Yang Yang,Xinyu Chen,Liping Ran,Yunfei Wu,Xurun Yu,Zhaodi Dong,Fei Xiong 한국식물학회 2019 Journal of Plant Biology Vol.62 No.4

The development of protein bodies (PBs) determinesthe processing properties of wheat (Triticum aestivum L.). Ithas been known that nitrogen uptake has a strong impact ongrain protein concentration. However, the differences of theformation of PB in different developmental stages anddifferent positions in wheat endosperm are still controversial. To solve these issues, PBs formation in different wheatendosperm parts and the response to nitrogen were investigatedusing light, transmission electron microscopes in presentstudy. The main results were as follows. (1) Proteins mainlyformed PBs via the Golgi apparatus in the vacuole at theearly stage of wheat endosperm development. After 7 dayspost anthesis, most proteins were derived from the roughendoplasmic reticulum. (2) The morphology of PBs was diverseamong different endosperm parts. Compared with the centralendosperm, the PBs in sub-aleurone cells were abundant andlarge. (3) More abundant endoplasmic reticulum, Golgi andmitochondrion were observed at the early stage after nitrogentreatment. Nitrogen also increased the accumulation of PBsat the later stage. (4) The sub-aleurone region cells of theendosperm presented more significant responses to nitrogenthan the central endosperm.

Effects of Ga-doping on the microstructure and magnetic properties of MnBi alloys

Yang, Yang,Kim, Jong-Woo,Si, Ping-Zhan,Qian, Hui-Dong,Shin, Yongho,Wang, Xinyou,Park, Jihoon,Li, Oi Lun,Wu, Qiong,Ge, Hongliang,Choi, Chul-Jin Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.769 No.-

<P><B>Abstract</B></P> <P>The low temperature phase Mn<SUB>55</SUB>Bi<SUB>45-<I>x</I> </SUB>Ga<SUB> <I>x</I> </SUB> (<I>x</I> = 0, 1, 3, 5, and 10) alloys were prepared by induction melting process with subsequent low temperature annealing. The effects of Ga-doping on the crystal structure and magnetic properties of the alloys were systematically studied. The room temperature coercivities of Mn<SUB>55</SUB>Bi<SUB>45-<I>x</I> </SUB>Ga<SUB> <I>x</I> </SUB> after ball milling increased from 1.43 T for <I>x</I> = 0 to 1.66 T for <I>x</I> = 5, while the saturation magnetization decreased from 60.7 Am<SUP>2</SUP>/kg (<I>x</I> = 0) to 45.1 Am<SUP>2</SUP>/kg (<I>x</I> = 5). The maximum energy product (<I>BH</I>)<SUB>max</SUB> of Mn<SUB>55</SUB>Bi<SUB>44</SUB>Ga powders reached 7.87 MGOe. The Curie temperature of the Mn<SUB>55</SUB>Bi<SUB>45-<I>x</I> </SUB>Ga<SUB> <I>x</I> </SUB> alloys increased from 633 K to 658 K with increasing Ga concentration in the range of 0 ≤ <I>x</I> ≤ 5.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effects of doping Ga on the microstructural and magnetic properties of MnBi alloy. </LI> <LI> The MnBi-Ga powders are achieved by surfactant assisted high energy ball milling. </LI> <LI> The maximum energy produce (<I>BH</I>)<SUB>max</SUB> shows 7.87 MGOe for Mn<SUB>55</SUB>Bi<SUB>44</SUB>Ga sample. </LI> <LI> The coercivity of Mn<SUB>55</SUB>Bi<SUB>40</SUB>Ga<SUB>5</SUB> after ball milling reached 1.66 T at room temperature. </LI> <LI> The elevated curie temperature (<I>T</I> <SUB>c</SUB>) by doping Ga makes it a possible candidate for high temperature applications. </LI> </UL> </P>

The effect of Ga-doping on the structure and magnetic properties of MnBi

Yang Yang,Qiong Wu,Pengyue Zhang,Hongliang Ge,Jong-Woo Kim,Chul-Jin Choi 한국자기학회 2017 한국자기학회 학술연구발표회 논문개요집 Vol.2017 No.11