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( Peng Zeng ),( Xiaoping Sun ),( Tianbin Li ),( Tianlong Zhang ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Due to large uncertainties embedded in the geotechnical parameters, dynamic numerical model can hardly be applied to directly provide an accurate prediction for landslide run-out distance. Therefore, it is important to quantify these uncertainties to improve the reliability of the prediction. In this study, a probabilistic method is proposed to assess the exceedance probability of landslide run-out distance using a depth-averaged model encoded in Massflow and a response surface method (RSM)-based reliability method. Two rheological parameters (i.e., the friction angle and the pore pressure ratio) are considered as random variables. The limit state function (LSF) is established based on a given threshold value of the run-out distance (e.g., the distance from a building to the landslide). The RSM is then adopted to establish an approximation to the original LSF. Finally, the first-order and the second-order reliability method (FORM/SORM) are conducted based on the RSM to calculate the probability of the run-out distance exceeding the given threshold value. The Shenzhen landslide occurred in 2015 is employed to illustrate the performance of the proposed method. Results show that our proposed method can successfully assess the exceedance probability of run-out distance with acceptable computational errors; and it significantly improves the computational efficiency compared with the direct Monte Carlo simulation. Moreover, SORM produces more accurate results than FORM, which implies that the LSF is somewhat highly nonlinear. In general, this study presents a practical procedure to enhance the probabilistic run-out prediction of landslides, and also provides a key information for quantitative landslide risk assessment.
Xi Zeng,Shi-ming Ji,Ming-sheng Jin,Da-peng Tan,Jue-hui Li,Wen-tao Zeng 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
In order to improve material removal rate of laser hardening workpiece and also make machining tool suitable for free-form surface,a new method based on the softness consolidation abrasives (SCA) is put forward, which means the abrasives are consolidated onthe outer layer of pneumatic wheel to achieve the softness-machining. Binder selecting test shows that acidic silicone is proved tosuit for consolidating particles in cutting process. Combined with robot, the machining system has been established. The machiningeffects of SCA are investigated when it faces with workpiece of different hardness. According to the Preston predicted model, thesimulation results of stress and velocity are proven by analysis of average roughness in the contact region. The contrastive machiningexperimental results show that SCA can supply high cutting stress for material removal and fit for freeform surface’s machining byself-adjustment of flexible body.
Peng Nong,Yue Pan,Qinpeng Dong,Dafu Zeng,Mingzhao Xu,Xiang Wang,Jiaming Wang,Lian Deng,Xiuli Chen,Huanfu Zhou 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.1
NaNbO 3 -based lead-free ceramics are gaining widespread interest in recent years due to their environmental friendlinessand low density, which can meet the needs of future advanced pulse power electronics for low cost, miniaturization andintegration. However, a reversible phase transition of FE-AFE at room temperature for pure NaNbO 3 ceramic will producea large residual polarization, resulting in a low energy storage capacity. In this work, the ternary system (1- x )(0.92NaNbO 3 -0.08Bi(M g0.5 Ti 0.5 )O 3 )- x CaTiO 3 was designed by introducing the linear material CaTiO 3 doped into (0.92NaNbO 3 -0.08Bi(Mg 0.5 Ti 0.5 )O 3 ) ceramics to enhance the disorder of A/B sites in the system. The introduce of CaTiO 3 could optimizethe relaxation characteristics of the ceramics, refi ne the grain size to improve the breakdown fi eld strength( E b ), which enhancethe energy storage properties to W rec = 5.71 J/cm 3 and η = 85.7% at 475 kV/cm. Additionally, the 0.8(0.92NN-0.08BMT)-0.2CT ceramic achieves both temperature (20–160 °C) and frequency (5 Hz -120 Hz) stability, while also obtains excellentcharge/discharge performance( C D = 607.22 A/cm 2 , P D = 48.58 MW/cm 3 , t 0.9 = 28 ns), which indicates the great potentialapplication in pulsed power capacities.
Subspace Identification for Fractional Order Hammerstein Systems Based on Instrumental Variables
Zeng Liao,Zhuting Zhu,Shu Liang,Cheng Peng,Yong Wang 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.5
This paper focuses on time-domain identification issues of multi-input multi-output (MIMO) fractional order Hammerstein systems which are the extension of traditional Hammerstein type models by allowing linear part to be fractional order systems. The principal component analysis (PCA) method in subspace family is extended to identify coefficient matrixes of fractional order systems. Singular value decomposition (SVD) is utilized to estimate the unknown parameters of nonlinear part of system directly. A proper instrumental variable is chosen to eliminate the bias of identification results. Numerical simulation validates the proposed method.
Peng Youyuan,Zeng Xiuya,Lian Mingjian,Wang Yanfeng 대한독성 유전단백체 학회 2022 Molecular & cellular toxicology Vol.18 No.3
Background FXYD3, as a regulator of ion transporting membrane protein, plays a key role in the progression of various cancers. It is reported that FXYD3 is overexpressed in pancreatic cancer, but the molecular mechanism of FXYD3 regulating pancreatic cancer is not well illustrated. Objective The aim of this work was to study the role of FXYD3 in pancreatic cancer and the underlying mechanism. Results The expression of FXYD3 was aberrantly high in pancreatic cancer tissues and cells compared to the controls. High expression of FXYD3 was associated with the patient’s poor prognosis and promoted the proliferation, migration, and invasion of pancreatic cancer cells. Furthermore, FXYD3 expression was positively correlated with the activation of cGMP-PKG signaling pathway, and FXYD3 could enhance cGMP content. Conclusion Our study speculated that FXYD3 was likely to activate the cGMP-PKG signaling pathway to promote tumor proliferative activity. These findings contribute to understanding the role of FXYD3 in the development of pancreatic cancer and provide new therapeutic targets for its treatment.
Zeng Weizhu,Zheng Zhaoyong,Zhang Cuiping,Zhou Peng 한국해양과학기술원 2023 Ocean science journal Vol.58 No.2
To understand the spatial distribution and vertical evolution of sediments in the Pearl River Estuary in recent decades, two sediment cores (80 cm long) from the western and eastern areas of the outer Lingdingyang Bay (LDB) were analyzed in terms of grain size (GZs) and organic matter content. The results showed that the sediment profiles of the two cores could be divided into two time sections with clear changes in grain size. The core in the western region showed a coarse-to-fine trend from the lower to the upper section, whereas that in the eastern region showed a fine-to-coarse trend. Parametric correlations of the cores suggest that different sediment sources and hydrodynamic environments resulted in opposite sediment trends in the two cores. Based on some reported sedimentation rates, the GZs of the western and eastern cores responded well to changes in the average annual fluvial sediment load and tidal range in the western and eastern areas of the LDB, respectively. The increase in grain size and decrease in sorting value in the upper section of the two cores can provide evidence of a strengthened tidal current in recent years. Our results can provide a baseline for future studies on the responses of marine environment to anthropogenic activities in the Guangdong-Hong Kong-Macao Greater Bay Area.
Guitao Zeng,Weibin Chen,Juanhong Li,Peng Wu,Bin Huang,Dazhuan Wu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
Mixed-flow pumps have been widely used in water jet propulsion field. To ensure reliability and operation efficiency, it is necessary to investigate the characteristics of hydraulic excitation force during transient operations. In this paper, the radial force of a water jet mixed-flow pump during rapid startup period was investigated numerically based on improved delayed detached eddy simulation (IDDES) and siding mesh method, the external characteristics were verified by test results. The spatial-temporal evolution of radial force was analyzed. The radial force during rapid startup presents transient and delay phenomenon, which shows disparity compared with quasi-steady state. The flow analysis and blade strip analysis show inlet recirculation significantly affects the radial force’s evolution, the radial force is quite different from blade root to tip and the blade tip contributes most to the radial force delay phenomenon. By applying boundary vorticity flux (BVF) theory and separation vortex formation diagnosis, separation regions caused by the dissipation of inlet recirculation were effectively identified and the change trend is in line with the change of radial force, which explains how inlet recirculation results the delay of radial force on blade tip strip and the whole impeller blade.
A Method for Aggregating Intuitionistic Linguistic Information under Confidence Levels
Wuzhen Peng,Shouzhen Zeng 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.1
In this paper we study a new method base on confidence levels for aggregating intuitionistic linguistic information. A new intuitionistic linguistic aggregation operator called the confidence intuitionistic linguistic ordered weighted averaging (CILOWA) operator is developed. Some of the CILOWA’s main properties and different families are also studied. Moreover, a practical method based on the CILOWA operator for multi-criteria decision making with intuitionistic linguistic information is presented. Finally, an illustrative example demonstrates the practicality and effectiveness of the proposed method.
H<SUB>∞</SUB> Filtering for Descriptor Systems
Yue-Peng Chen,Zu-De Zhou,Chun-Nian Zeng,Qing-Ling Zhang 대한전기학회 2006 International Journal of Control, Automation, and Vol.4 No.6
The paper is concerned with H∞ filtering for descriptor systems. A necessary and sufficient condition is established in terms of linear matrix inequalities (LMIs) for the existence of normal filters such that the error systems are admissible and the transfer function from the disturbance to the filtering error output satisfies a prescribed H∞-norm bound constraint. When these LMIs are feasible, an explicit parameterization expression of all desired normal filter is given. All these results are yielded without decomposing the original descriptor systems, which makes the filter design procedure simple and direct. Finally, a numerical example is derived to demonstrate the applicability of the proposed approach.