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Zhensheng Fu,Xiangyi Hu,Jianhua Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1
Ye’s nonlinear cumulative damage model has been widely used in engineering because of its simple mathematical form and clear physical meaning. However, it does not consider the interaction between two different loads, so its prediction accuracy has large room for improvement. In this paper, the k-th power of load ratio is introduced into Ye’s model to reflect the influence of the interaction between two different loads on fatigue damage during the damage evolution process, and a generalized expression of the model is obtained. Based on this generalized expression, a new fatigue life prediction method is proposed. The proposed method is validated by comparison with existing versions based on the experimental data of typical engineering materials under two-level and multilevel loads. The results show that the prediction method proposed here can well reflect the load interaction effect, and compared with other models, this method has a more accurate prediction effect on the fatigue life of four materials.
Zhu, Jianhua,Fu, Xinmiao,Koo, Yoon Duck,Zhu, Jian-Kang,Jenney Jr., Francis E.,Adams, Michael W. W.,Zhu, Yanmei,Shi, Huazhong,Yun, Dae-Jin,Hasegawa, Paul M.,Bressan, Ray A. American Society for Microbiology 2007 Molecular and cellular biology Vol.27 No.14
<B>ABSTRACT</B><P>The myristoylated calcium sensor SOS3 and its interacting protein kinase, SOS2, play critical regulatory roles in salt tolerance. Mutations in either of these proteins render <I>Arabidopsis thaliana</I> plants hypersensitive to salt stress. We report here the isolation and characterization of a mutant called <I>enh1-1</I> that enhances the salt sensitivity of <I>sos3-1</I> and also causes increased salt sensitivity by itself. <I>ENH1</I> encodes a chloroplast-localized protein with a PDZ domain at the N-terminal region and a rubredoxin domain in the C-terminal part. Rubredoxins are known to be involved in the reduction of superoxide in some anaerobic bacteria. The <I>enh1-1</I> mutation causes enhanced accumulation of reactive oxygen species (ROS), particularly under salt stress. ROS also accumulate to higher levels in <I>sos2-1</I> but not in <I>sos3-1</I> mutants. The <I>enh1-1</I> mutation does not enhance <I>sos2-1</I> phenotypes. Also, <I>enh1-1</I> and <I>sos2-1</I> mutants, but not <I>sos3-1</I> mutants, show increased sensitivity to oxidative stress. These results indicate that ENH1 functions in the detoxification of reactive oxygen species resulting from salt stress by participating in a new salt tolerance pathway that may involve SOS2 but not SOS3.</P>
Yixin Dou,Jianhua Fu,Zhihao Wang 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.9
The reconstruction of a volatility based on a Black-Scholes option pricing model is ill-posed. In order to overcome the ill-posedness, a homotopy perturbation inversion method is designed to solve the inverse problem. The proposed method is a modified version of the Landweber method. The reconstruction of a volatility is a nonlinear problem which is needed to be linearized. Hence, numerical experiments consist of the reconstruction of a policy parameter based on a Todaro model which is a linear inverse problem and the reconstruction of a volatility based on a Black-Scholes option pricing model in order to test the performance of the proposed method. Numerical examples show that the proposed method is more accurate and faster than the Landweber method.
An Optimal ODAM-Based Broadcast Algorithm for Vehicular Ad-Hoc Networks
( Weifeng Sun ),( Feng Xia ),( Jianhua Ma ),( Tong Fu ),( Yu Sun ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.12
Broadcast routing has become an important research field for vehicular ad-hoc networks (VANETs) recently. However, the packet delivery rate is generally low in existing VANET broadcast routing protocols. Therefore, the design of an appropriate broadcast protocol based on the features of VANET has become a crucial part of the development of VANET. This paper analyzes the disadvantage of existing broadcast routing protocols in VANETs, and proposes an improved algorithm (namely ODAM-C) based on the ODAM (Optimized Dissemination of Alarm Messages) protocol. The ODAM-C algorithm improves the packet delivery rate by two mechanisms based on the forwarding features of ODAM. The first distance-based mechanism reduces the possibility of packet loss by considering the angles between source nodes, forwarding nodes and receiving nodes. The second mechanism increases the redundancy of forwarding nodes to guarantee the packet success delivery ratio. We show by analysis and simulations that the proposed algorithm can improve packet delivery rate for vehicular networks compared against two widely-used existing protocols.
Gu Yan,Sun Jianhua,Fu Xiuwei 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
Given the importance of synchronization in chaotic systems, this paper presents a new approach to achieve this goal. Simultaneous consideration of time-varying delays, disturbances, uncertainties, and nonlinear terms in a fractional order chaotic system poses a fundamental challenge for achieving the synchronization goal and this paper presents a novel complex approach resulting from neural network and sliding mode approaches to overcome it. The Chebyshev neural network has been used to estimate the delayed nonlinear functions as well as the uncertain parts of the fractional order chaotic system, and the robust sliding mode technique has been considered to ensure stability against the effects of multiple inconveniences. Finally, simulation and comparison in MATLAB environment confirms the efficiency and ability of the proposed scheme in achieving the goal of robust synchronization despite the uncertainty, variable time delay, disturbance and nonlinear terms.
Jun Li,Chuanxin Huang,Yi-Zhou Fu,Jianhua Zhang,Xue-Yin Jiang,Zhi-Lin Zhang 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.1
Amorphous LaZnSnO thin films with different La doping concentrationare prepared by a combustion solution process and theelectrical performances of thin film transistors (TFTs) areinvestigated. The influence of La content on the structure, oxygenvacancies, optical and electrical performance of LaZnSnO thinfilms are investigated. At an appropriate amount of La doping(15 mol.%), LaZnSnO-TFT shows a superior electrical performanceincluding a mobility of 4.2 cm2/V s, a subthreshold swing of 0.50 V/decade and an on/off current ratio of 1.9 × 107. The highperformance LaZnSnO-TFT is attributed to the better interfacebetween SiO2 and LaZnSnO channel layer and the suppression ofoxygen vacancies by optimizing La content. It suggests that Ladoping can be a useful technique for fabricating high performancesolution-processed oxide TFTs.
Ling Fan,Zhao Chen,Wenbin Fu,Nenggui Xu,Jianhua Liu,Aiping Lu,Ziping Li,Shengyong Su,Taixiang Wu,Aihua Ou 사단법인약침학회 2016 Journal of Acupuncture & Meridian Studies Vol.9 No.5
This study aims to investigate the molecular mechanisms of acupuncture in the remission of depression. A depressive disorder model was induced by exposing Sprague–Dawley rats to chronic unpredictable stress. The rats were divided into five groups: healthy (blank group) and stressed rats (model group), and stressed rats treated with acupuncture (acupuncture group), riluzole (riluzole group), acupuncture combined with botulinum toxin A (BTX-A) injection (acupuncture+BTX-A group) or riluzole combined with BTX-A injection (riluzole+BTX-A group). Behavioral analysis showed significant differences in sucrose consumption, weight, and horizontal or vertical movements between the model and both the riluzole and acupuncture groups. No obvious differences between the riluzole+BTX-A and acupuncture+BTX-A groups were found. Moreover, no significance differences in glutamate content in the hippocampus were found among the riluzole+BTX-A, acupuncture+BTX-A and model groups (p>0.05). Western blots and reverse transcription polymerase chain reactions were employed to detect protein and mRNA expressions of VGLUT2, SNAP25, VAMP1, VAMP2, VAMP7, and syntaxin1; no obvious differences among the riluzole+BTX-A, acupuncture+BTX-A and model groups were found. These data suggest that soluble N-ethylmaleimide-sensitive factor attachment receptor proteins are involved in the remission of depression in rats treated with acupuncture.
Shrestha, Rajiv Prasad,Qiao, Jian Min,Shen, Fu Guo,Bista, Krishna Bahadur,Zhao, Zhong Nan,Yang, Jianhua The Korean Neurosurgical Society 2014 Journal of Korean neurosurgical society Vol.56 No.5
Objective : To assess the effect of bone marrow mononuclear cells (BMMNCs) transplantation in the expression of nuclear factor-${\kappa}B$ (NF-${\kappa}B$) in spinal cord injury (SCI) in rats. Methods : BMMNCs were isolated from tibia and femur by a density gradient centrifugation. After establishment of acute transection SCI, rats were divided into experiment (BMMNCs), experiment control (0.1 M PBS infused) and sham surgery groups (laminectomy without any SCI). Locomotor function was assessed weekly for 5 weeks post-injury using BBB locomotor score and urinary bladder function daily for 4 weeks post-injury. Activity of NF-${\kappa}B$ in spinal cord was assessed by immunohistochemistry and reverse transcriptase polymerase chain reaction. Results : At each time point post-injury, sham surgery group had significantly higher Basso, Beattie, Bresnahan locomotor and urinary bladder function scores than experiment and experiment control group (p<0.05). At subsequent time interval there were gradual improvement in both experiment and experiment control group, but experiment group had higher score in comparison to experiment control group (p<0.05). Comparisons were also made for expression of activated NF-${\kappa}B$ positive cells and level of NF-${\kappa}B$ messenger RNA in spinal cord at various time points between the groups. Activated NF-${\kappa}B$ immunoreactivity and level of NF-${\kappa}B$ mRNA expression were significantly higher in control group in comparison to experiment and sham surgery group (p<0.05). Conclusion : BMMNCs transplantation attenuates the expression of NF-${\kappa}B$ in injured spinal cord tissue and thus helps in recovery of neurological function in rat models with SCI.