Suppression of Mechanical Resonance Using Torque Disturbance Observer for Two-Inertia System with Backlash

Ming Yang,Weilong Zheng,Kaixuan Yang,Dianguo Xu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

In servo system, elastic component in transmission can produce mechanical resonance. The existence of backlash will aggravate the damage of resonance. According to dead-zone model, two-mass elastic system with backlash is established. The conclusion that the existence of backlash decreases the elastic coefficient of shaft equivalently and its quantitative relation are researched. This paper proposes a torque disturbance observer to realize the suppression of mechanical resonance with limiting control for shaft torque amplitude. The observer can decrease ratio of inertia equivalently in the case of no identification of backlash value. It has a compensation result that system is changed to a rigid system with single moment of inertia. In addition, this compensation algorithm is independent with parameters and configuration of speed controller. Simulations and experiments demonstrate the effectiveness of this torque disturbance observer.

Fluorine-doped porous carbon-decorated Fe₃O₄-FeF₂ composite versus LiNi_0.5Mn_1.5O₄ towards a full battery with robust capability

Ming, Hai,Ming, Jun,Kwak, Won-Jin,Yang, Wenjing,Zhou, Qun,Zheng, Junwei,Sun, Yang-Kook Elsevier 2015 ELECTROCHIMICA ACTA Vol.169 No.-

<P><B>Abstract</B></P> <P>A new fluorine-doped porous carbon-decorated Fe<SUB>3</SUB>O<SUB>4</SUB>-FeF<SUB>2</SUB> composite, referred to as Fe<SUB>3</SUB>O<SUB>4</SUB>-FeF<SUB>2</SUB>@CF<SUB>x</SUB>, was prepared for the first time. The formation mechanism is discussed, and a new concept of introducing double layers of FeF<SUB>2</SUB> and CF<SUB>x</SUB> into the oxide-based anode is presented for lithium ion batteries. Varying the amount of fluorine precursor, derivatives of Fe<SUB>3</SUB>O<SUB>4</SUB>@CF<SUB>x</SUB> and FeF<SUB>2</SUB>@CF<SUB>x</SUB> were further obtained, allowing an original analysis of their electrochemical behaviors. As-prepared Fe<SUB>3</SUB>O<SUB>4</SUB>-FeF<SUB>2</SUB>@CF<SUB>x</SUB> can deliver a high capacity of 718mAhg<SUP>−1</SUP> at 50mAg<SUP>−1</SUP>. Under a hash rate of 1600mAg<SUP>−1</SUP>, the capacity of Fe<SUB>3</SUB>O<SUB>4</SUB>-FeF<SUB>2</SUB>@CF<SUB>x</SUB> (around 338mAhg<SUP>−1</SUP>) is higher than that (200mAhg<SUP>−1</SUP>) of FeF<SUB>2</SUB>@CF<SUB>x</SUB>. Further, its capacity retention of 97% over 100 cycles is much better than the 59.4% observed for Fe<SUB>3</SUB>O<SUB>4</SUB>@CF<SUB>x</SUB>. The positive effect of the CF<SUB>x</SUB> layer on the electronic conductivity and ionic diffusion ability was confirmed. The role of FeF<SUB>2</SUB> in the stabilization of the structure of CF<SUB>x</SUB> and Fe<SUB>3</SUB>O<SUB>4</SUB> is also discussed. Further, a new battery composed of Fe<SUB>3</SUB>O<SUB>4</SUB>-FeF<SUB>2</SUB>@CF<SUB>x</SUB>/LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> with a robust rate capability was assembled and delivered a reversible capacity of 565mAhg<SUP>−1</SUP> (<I>vs.</I> anode) at 100mAg<SUP>−1</SUP> with a high potential of 3.3V and a capacity retention of 81.5% over 50 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new anode of fluorine-doped porous Fe<SUB>3</SUB>O<SUB>4</SUB>-FeF<SUB>2</SUB>@CF<SUB>x</SUB> composite is readily prepared. </LI> <LI> The CF<SUB>x</SUB> layer enhances the conductivity of Fe<SUB>3</SUB>O<SUB>4</SUB> and ensures a fast Li<SUP>+</SUP> diffusion. </LI> <LI> The FeF<SUB>2</SUB> can stabilize the structure of Fe<SUB>3</SUB>O<SUB>4</SUB> during the (dis) charge process. </LI> <LI> The Fe<SUB>3</SUB>O<SUB>4</SUB>-FeF<SUB>2</SUB>@CF<SUB>x</SUB> can deliver a high capacity with a robust rate capability. </LI> <LI> A full cell of Fe<SUB>3</SUB>O<SUB>4</SUB>-FeF<SUB>2</SUB>@CF<SUB>x</SUB>/LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> with high performance is assembled. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A new anode of fluorine doped porous Fe<SUB>3</SUB>O<SUB>4</SUB>-FeF<SUB>2</SUB>@CF<SUB>x</SUB> composite with double layers of FeF<SUB>2</SUB> and CF<SUB>x</SUB> was presented for the first time, and a high rate capability was obtained in lithium ion battery. Besides, a new full battery of Fe<SUB>3</SUB>O<SUB>4</SUB>-FeF<SUB>2</SUB>@CF<SUB>x</SUB>/LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> with a high capacity of 565mAhg<SUP>−1</SUP> (<I>vs</I>. anode) at the current density of 100mAg<SUP>−1</SUP> was successfully introduced. It demonstrated a robust rate capability, high operating potential of 3.3V and fine cycle ability over 50 cycles with capacity retention of 81.5%.</P> <P>[DISPLAY OMISSION]</P>

Multivariate Analysis of the Prognosis of 37 Chondrosarcoma Patients

Yang, Zheng-Ming,Tao, Hui-Min,Ye, Zhao-Ming,Li, Wei-Xu,Lin, Nong,Yang, Di-Sheng Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.4

Objective: The current study aimedto screen for possible factors which affect prognosis of chondrosarcoma. Methods: Thirty seven cases were selected and analyzed statistically. The patients received surgical treatment at our hospital between December 2005 and March 2008. All of them had complete follow-up data. The survival rates were calculated by univariate analysis using the Kaplan-Meier method and tested by Log-rank. ${\chi}^2$ or Fisher exact tests were carried out for the numeration data. The significant indexes after univariate analysis were then analyzed by multivariate analysis using COX regression model. Based on the literature, factors of gender, age, disease course, tumor location, Enneking grades, surgical approaches, distant metastasis and local recurrence were examined. Results: Univariate analysis showed that there were significant differences in Enneking grades, surgical approaches and distant metastasis related to the patients' 3-year survival rate after surgery (P<0.001). No significant difference was not found in gender, age, disease course, tumor location or local recurrence (P>0.05). Multivariate analysis showed that Enneking grade (P=0.007) and surgical approaches (P=0.010) were independent factors affecting the prognosis of chondrosarcoma, but distant metastasis was not (P=0.942). Conclusion: Enneking grades, surgical approaches and distant metastasis are risk factors for prognosis of chondrosarcoma, among which the former two are independent factors.

Genome-wide association study reveals genetic loci and candidate genes for average daily gain in Duroc pigs

Quan, Jianping,Ding, Rongrong,Wang, Xingwang,Yang, Ming,Yang, Yang,Zheng, Enqin,Gu, Ting,Cai, Gengyuan,Wu, Zhenfang,Liu, Dewu,Yang, Jie Asian Australasian Association of Animal Productio 2018 Animal Bioscience Vol.31 No.4

Objective: Average daily gain (ADG) is an important target trait of pig breeding programs. We aimed to identify single nucleotide polymorphisms (SNPs) and genomic regions that are associated with ADG in the Duroc pig population. Methods: We performed a genome-wide association study involving 390 Duroc boars and by using the PorcineSNP60K Beadchip and two linear models. Results: After quality control, we detected 3,5971 SNPs, which included seven SNPs that are significantly associated with the ADG of pigs. We identified six quantitative trait loci (QTL) regions for ADG. These QTLs included four previously reported QTLs on Sus scrofa chromosome (SSC) 1, SSC5, SSC9, and SSC13, as well as two novel QTLs on SSC6 and SSC16. In addition, we selected six candidate genes (general transcription factor 3C polypeptide 5, high mobility group AT-hook 2, nicotinamide phosphoribosyltransferase, oligodendrocyte transcription factor 1, pleckstrin homology and RhoGEF domain containing G4B, and ENSSSCG00000031548) associated with ADG on the basis of their physiological roles and positional information. These candidate genes are involved in skeletal muscle cell differentiation, diet-induced obesity, and nervous system development. Conclusion: This study contributes to the identification of the casual mutation that underlies QTLs associated with ADG and to future pig breeding programs based on marker-assisted selection. Further studies are needed to elucidate the role of the identified candidate genes in the physiological processes involved in ADG regulation.

Letters to the Editor : Decreased Serum Level of Interferon-γ in Patients with Pityriasis Rosea

( Ming Zeng ),( Shi Xiang Zhao ),( Ling Hua Liu ),( Xian Bo Zuo ),( Xiao Dong Zheng ),( Tao Li ),( Min Zhang ),( Pei Guang Wang ),( Sen Yang ) 대한피부과학회 2014 Annals of Dermatology Vol.26 No.4

Dysregulated Fatty Acid Metabolism in Hepatocellular Carcinoma

( Ming-da Wang ),( Jun Han ),( Hao Xing ),( Han Zhang ),( Zheng Wang ),( Zhen-li Li ),( Liang Lei ),( Chao Li ),( Feng Shen ),( Tian Yang ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1

Aims: Studies are urgently needed on it molecular pathogenesis and biological characteristics of hepatocellular carcinoma (HCC). Dysregulation of fatty acid (FA) metabolism, in which aberrant activation of oncogenic signaling pathways alters the expression and activity of lipid-metabolizing enzymes, is an emerging hallmark of cancer cells, and it may be involved in HCC development and progression. Methods: We summarize the characteristics of FA metabolism in HCC, focusing on the pathways of FA synthesis, oxidation, uptake and transport. We also provide a brief review of the relationship between NAFLD and HCC development. Results: The current review summarizes the dysregulated FA metabolism in HCC and pathways through which this dysregulation may regulate HCC survival and growth. Aberrant activation of oncogenic signaling pathways regulates the expression and activity of lipid-metabolizing enzymes, thus reprogramming FA metabolism to promote HCC development and progression. Intracellular FAs are required for biosynthesis of most biological membrane lipids and signaling molecules, and are also used to provide energy to support HCCs survival and proliferation, when necessary, through β-oxidation process. HCC cells can employ appropriate metabolic pathways as different situation demands. Intrahepatic cholangiocarcinoma (ICC) and HCC exhibits differential requirement for de novo lipogenesis and distinct response to therapeutic approaches focusing on inhibition of exogenous FA uptake. Non-alcoholic fatty liver disease related obesity and diabetes have increasingly emerged as two major factors responsible for the rise in prevalent of HCC. Conclusions: Our understanding of dysregulated FA metabolism and associated signaling pathways may contribute to the development of novel and efficient anti-tumor approaches for patients with HCC.

Voluntary running depreciates the requirement of Ca²⁺-stimulated cAMP signaling in synaptic potentiation and memory formation

Zheng, Fei,Zhang, Ming,Ding, Qi,Sethna, Ferzin,Yan, Lily,Moon, Changjong,Yang, Miyoung,Wang, Hongbing Cold Spring Harbor Laboratory Press 2016 Learning & Memory Vol.23 No.8

<P>Mental health and cognitive functions are influenced by both genetic and environmental factors. Although having active lifestyle with physical exercise improves learning and memory, how it interacts with the specific key molecular regulators of synaptic plasticity is largely unknown. Here, we examined the effects of voluntary running on long-term potentiation (LTP) and memory formation in mice lacking type 1 adenylyl cyclase (AC1), a neurospecific synaptic enzyme that contributes to Ca2+-stimulated cAMP production. Following 1 mo of voluntary running-wheel exercise, the impaired LTP and object recognition memory in AC1 knockout (KO) mice were significantly attenuated. Running up-regulated exon II mRNA level of BDNF (brain-derived neurotrophic factor), though it failed to increase exon I and IV mRNAs in the hippocampus of AC1 KO mice. Intrahippocampal infusion of recombinant BDNF was sufficient to rescue LTP and object recognition memory defects in AC1 KO mice. Therefore, voluntary running and exogenous BDNF application overcome the defective Ca2+-stimulated cAMP signaling. Our results also demonstrate that alteration in Ca2+-stimulated cAMP can affect the molecular outcome of physical exercise.</P>

Safeguarding Decentralized Wireless Networks Using Full-Duplex Jamming Receivers

Zheng, Tong-Xing,Wang, Hui-Ming,Yang, Qian,Lee, Moon Ho IEEE 2017 IEEE Transactions on Wireless Communications Vol.16 No.1

<P>In this paper, we study the benefits of full-duplex (FD) receiver jamming in enhancing the physical-layer security of a two-tier decentralized wireless network with each tier deployed with a large number of pairs of a single-antenna transmitter and a multi-antenna receiver. In the underlying tier, the transmitter sends unclassified information and the receiver works in the half-duplex (HD) mode receiving the desired signal. In the overlaid tier, the transmitter delivers confidential information in the presence of randomly located eavesdroppers, and the receiver works in the FD mode radiating jamming signals to confuse eavesdroppers and receiving the desired signal simultaneously. We provide a comprehensive performance analysis and network design under a stochastic geometry framework. Specifically, we consider the scenarios where each FD receiver uses single-and multi-antenna jamming, and analyze the connection probability and the secrecy outage probability of a typical FD receiver by deriving accurate expressions and more tractable approximations for the two probabilities. We also determine the optimal deployment density of the FD-mode tier to maximize the network-wide secrecy throughput subject to constraints including the given dual probabilities and the network-wide throughput of the HD-mode tier. Numerical results are demonstrated to verify our theoretical findings, and show that the network-wide secrecy throughput is significantly improved by properly deploying the FD-mode tier.</P>

The binder effect on an oxide-based anode in lithium and sodium-ion battery applications: the fastest way to ultrahigh performance

Ming, Jun,Ming, Hai,Kwak, Won-Jin,Shin, Changdae,Zheng, Junwei,Sun, Yang-Kook The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.87

<P>A positive effect of the polyacrylic acid (PAA)–carboxymethyl cellulose (CMC) binder to enhance the performance of an oxide-based anode was reported in batteries. A series of super high capacity and cycling ability oxide powders rarely achieved before was obtained, particularly most of them without any specific carbon modification and/or morphology control.</P> <P>Graphic Abstract</P><P>A positive effect of the polyacrylic acid–carboxymethyl cellulose binder to enhance the performance of an oxide-based anode was reported in batteries. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc02657h'> </P>

Wireless Powered Asynchronous Backscatter Networks With Sporadic Short Packets: Performance Analysis and Optimization

Yang, Qian,Wang, Hui-Ming,Zheng, Tong-Xing,Han, Zhu,Lee, Moon Ho IEEE 2018 IEEE Internet of things journal Vol.5 No.2

<P>In the fifth generation era, the pervasive applications of Internet of Things and massive machine-type communications have initiated increasing research interests on the backscatter wireless powered communication (B-WPC) technique due to its ultrahigh energy efficiency and low cost. The ubiquitous B-WPC network is characterized by nodes with dynamic spatial positions and sporadic short packets, of which the performance has not been fully investigated. In this paper, we give a comprehensive analysis of a multiantenna B-WPC network with sporadic short packets under a stochastic geometry framework. By exploiting a time-space Poisson point process model, the behavior of the network is well captured in a decentralized and asynchronous transmission way. We then analyze the energy and information outage performance in the energy harvest and backscatter modulation phases of the backscatter network, respectively. The optimal transmission slot length and division are obtained by maximizing the network-wide spatial throughput. Moreover, we find an interesting result that there exists the optimal tradeoff between the durations of the energy harvest and backscatter modulation phases for spatial throughput maximization. Numerical results are demonstrated to verify our analytical findings and show that this tradeoff region gets shrunk when the outage constraints become more stringent.</P>