Generalized extreme learning machine acting on a metric space

Zhao, Jianwei,Park, Dong Sun,Lee, Joonwhoan,Cao, Feilong Springer-Verlag 2012 SOFT COMPUTING Vol.16 No.9

Mode-dependent H∞ Filtering for Time-varying Delays Neutral Jump Systems Based on FWM Technique

Guowei Zhao,Guangming Zhuang,Jianwei Xia,Wei Sun,Junsheng Zhao,Minsong Zhang 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.6

This paper is concerned with the problem of mode dependent H∞ filter for uncertainty Markovian jump system with neutral delay and retarded time-varying delay. By using free weight matrix (FWM) technique, the stability conditions of delay dependent are obtained under the framework of Lyapunov stability theory. Based on those result, the delay dependent conditions for full order and mode dependent Markovian jump linear filters are gained, which are expressed by Linear matrix inequalities (LMIs). Finally, a numerical example and a PEEC practical example are employed to prove the validity of the results.

Analysis of the Current Situation and Hot Spots of Music Education Research in Elementary Schools in China

赵薇(Wei Zhao),赵敬霞(JingXia Zhao),佘建位(JianWei She) Korea Institute for Humanities and Social Sciences 2023 Journal of Global Arts Studies (JGAS) Vol.1 No.1

[Background] Music education, as one of the crucial artistic courses in school education, constitutes an integral part of students' comprehensive development. The relevant studies on perception, along with the promulgation and implementation of the 2022 edition of China's “Compulsory Education Art Curriculum Standards”, have laid a new foundation for the upcoming round of transformative restructuring in music education classrooms. [Objective] The objective of this study is to analyze relevant academic journal literature on elementary school music education during the first two rounds of curriculum reforms in China (2002-2012-2022). This analysis aims to reveal the research status and hotspots in this field over the past two decades, providing cognitive support for the upcoming round of curriculum reforms. [Method] Literature retrieval was conducted on the China National Knowledge Infrastructure (CNKI) database, and CiteSpace visualization analysis software was utilized. Employing quantitative and visual methods, an exploration and analysis of high-frequency terms, high-centrality terms, and salient terms in 2363 articles were conducted, presenting the structure and evolutionary trends in the research field. [Results] It was found that over the past 20 years, research themes in Chinese elementary school music education have gradually evolved. Early studies primarily focused on pedagogical methods in primary school music classrooms, music education, and music teachers. In recent years, emerging research topics encompass core competencies, presentation activities, and music literacy. [Conclusion] The findings indicate that the hotspots in research on Chinese elementary school music education align closely with the directions of contemporary curriculum reforms. Achievements predominantly converge on specific classroom teaching objectives, but the research focus on classroom teaching content varies across different stages of curriculum reform. This panoramic view provides essential reference for future practitioners and researchers in elementary music education, while offering crucial data support for decision-makers. Clarifying the trajectory of existing research achievements during the forthcoming curriculum reform process will facilitate the sustainable development of both elementary music education and the quality of classroom teaching in China. 【背景】音乐教育作为学校教育的重要艺术课程之一,是学生全面发展的组成部分。对领略的相关研究及中国2022 年版《义务教育艺术课程标准》的颁布实施,为新一轮音乐教育的课堂变革奠定了新的基础。【目的】对中国前两轮课程改革期间(2002 年-2012 年-2022 年)的初等学校音乐教育研究的相关学术期刊文献进行分析,揭示近20 年来该领域的研究现状和热点,可以为新一轮的课程改革提供认知支持。【方法】在中国知网数据库进行文献检索,借助CiteSpace 可视化分析软件,通过计量统计方法和可视化方法,对2363 篇文献的高频词、高中心性词和突显性词等进行探索和分析,呈现了研究领域的结构和演化趋势。【结果】发现,在过去20 年里,中国初等学校音乐教育的研究主题逐步演变。早期研究主要关注小学音乐课堂的教学方法、音乐教育与音乐教师。而近年来,新兴研究议题涉及核心素养、展示活动、音乐素养等方面。【结论】表明,中国初等学校音乐教育研究热点内容紧随时代的课程改革方向,成果聚集于具体的课堂教学目标,但在不同的课改阶段对课堂教学内容的研究关注各有所侧重。这一全景图为未来初等音乐教育的实践者和研究者提供了重要的参考,同时为决策者提供了数据支持。为新一轮的课程改革理清已有研究成果脉络,有助于推进中国初等音乐教育和课堂教学质量的可持续发展。

Design and Characteristic Measurement of 8000 mm Large Aperture Integrating Sphere

Zhao Zhang,Zhi Wan,Xiansheng Li,Hongxing Liu,Jingxu Sun,Zexun Liu,Yamin Wang,Jianwei Ren,Jianyue Ren 한국광학회 2016 Current Optics and Photonics Vol.20 No.4

Integrating spheres play a central role in the radiometric calibration of remote sensors. With thedevelopment of the wide field of view (FOV) remote sensors, aperture diameters of remote sensors arebecoming larger and larger. To satisfy the radiometric calibration requirements of full FOV and fullaperture, an 8000mm diameter large aperture integrating sphere uniform source with a variable exit portwas designed and manufactured. This integrating sphere will be used for pre-launch test and radiometriccalibration of remote satellites. In this paper, optical theories were used to design the output spectralradiance. The LightTools software based on ray-tracing simulation method was used to determine the bestcombination and distribution of inner light sources. A spectral experiment was made to verify the spectralradiance design. To reduce the influence of longtime power-on, a new characteristic measurement methodwas developed to obtain the radiation characteristic of the integrating sphere, which could greatly improvethe measuring efficiency. This method could also be applied to measure other large aperture uniformsources. The obtained results indicate that the spatial uniformity is 98.35%, and the angular uniformityat center position is 98.78%.

Dynamic Analysis of Slab Track with Crack Considering Rail Corrugation

Jianwei Yang,Peishan Liu,Xiaohui Wang,Yue Zhao,Fu Liu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.12

To investigate the dynamic response of ballastless slab track with crack in the rail corrugation area under the load of urban rail vehicle, this study establishes a vertical coupling dynamic model of the vehicle-rail-slab track, considering crack and rail corrugation. The exact closed-form solution of the vibration mode of the Euler Bernoulli beam with crack is introduced. Furthermore, a finite element model of the slab track is developed, and the vertical dynamic model's fastening force is applied to the slab track at the rail corrugation frequency to calculate the surface compressive stress of the slab track. The results indicate that, under rail corrugation conditions of varying magnitudes, the presence of crack induces higher vertical acceleration amplitudes in the slab track at low frequencies. As the wave depth increases, the acceleration of the slab track at the crack gradually intensifies. Moreover, with an increasing wavelength, the corresponding frequency to the acceleration amplitude of the slab track at the crack gradually decreases. Notably, when the wave depth is 0.2 mm and the wavelength is 50 mm, the axle load transfer rate exhibits the greatest increase. These research findings offer valuable insights for the maintenance of urban rail transit slab track systems.

Multi-factor Evolution for Large-scale Multi-objective Cloud Task Scheduling

Tianhao Zhao,Linjie Wu,Di Wu,Jianwei Li,Zhihua Cui 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.4

Scheduling user-submitted cloud tasks to the appropriate virtual machine (VM) in cloud computing is critical for cloud providers. However, as the demand for cloud resources from user tasks continues to grow, current evolutionary algorithms (EAs) cannot satisfy the optimal solution of large-scale cloud task scheduling problems. In this paper, we first construct a large-scale multi-objective cloud task problem considering the time and cost functions. Second, a multi-objective optimization algorithm based on multi-factor optimization (MFO) is proposed to solve the established problem. This algorithm solves by decomposing the large-scale optimization problem into multiple optimization subproblems. This reduces the computational burden of the algorithm. Later, the introduction of the MFO strategy provides the algorithm with a parallel evolutionary paradigm for multiple subpopulations of implicit knowledge transfer. Finally, simulation experiments and comparisons are performed on a large-scale task scheduling test set on the CloudSim platform. Experimental results show that our algorithm can obtain the best scheduling solution while maintaining good results of the objective function compared with other optimization algorithms.

Nondestructive Early Detection of Bruising in Pear Fruit Using Optical Coherence Tomography

Yang Zhou,Jianwei Mao,Di Wu,Tiebing Liu,Yun Zhao,Wujie Zhou,Zhengwei Chen,Fangni Chen 한국원예학회 2019 원예과학기술지 Vol.37 No.1

Pear fruit is susceptible to mechanical injury during harvesting, packaging, and transportation. Optical coherence tomography (OCT) can provide information concerning chemical and microstructural changes of fruit tissues. Therefore, using OCT to evaluate fruit quality is of great significance. In this study, OCT was used for early detection of subtle bruise symptoms underneath the pear peel. First, the signal intensity versus depth in relation to the OCT images of fruit tissue was determined, which was derived from the values of the OCT signal slope (OCTSS) and 1/e light penetration depth (D1/e). Furthermore, shaping (α) and scaling (β) indices were estimated by fitting a gamma distribution function to the signal intensity profile. After mechanical injury, OCTSS, α, and β decreased and the D1/e value increased. Distribution analysis of the relationship between α versus β served as an effective method to identify tissue bruising at an early stage. In conclusion, the results suggest that OCTSS, D1/e, and the α versus β distribution are closely correlated with bruise injury in pear fruit tissues. Thus, OCT is a promising technology for early and nondestructive bruise detection.

Event-triggered Extended Dissipative Control for Networked Singular Systems

Meiyu Li,Jianwei Xia,Junsheng Zhao,Huasheng Zhang,Hao Shen 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1

In this paper, an event-triggered extended dissipative control problem for networked singular systems isinvestigated, where the extended dissipativity analysis unifies the H∞ performance, L2 −L∞ performance, passivity,(Q,S,R)-dissipativity in one framework. Under the event-triggered scheme, the closed-loop system is modeled asa time-delay system. Some sufficient conditions for extended dissipativity are developed and presented in terms oflinear matrix inequalities (LMIs). Then the design of the state feedback controller becomes a matter of solving aset of LMIs. Finally, a numerical example is provided to illustrate the effectiveness of the proposed method.

Nonlinear modeling of flat-plate structures using grid beam elements

Ying Tian,Jianwei Chen,Aly Said,Jian Zhao 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.10 No.5

This paper presents a simplified grid beam model for simulating the nonlinear response of reinforced concrete flat-plate structures. The beam elements are defined with nonlinear behavior for bending moment and torsion. The flexural stiffness and torsional strength of the beam elements are defined based on experimental data to implicitly account for slab two-way bending effects. A failure criterion that considers the interaction between the punching strength and slab flexural behavior is incorporated in the model. The effects of bond-slip of slab reinforcement on connection stiffness are examined. The proposed grid beam model is validated by simulating large-scale tests of slab-column connections subjected to concentric gravity loading and unbalanced moment. This study also determines the critical parameters for a hysteretic model used to simulate flat-plates subjected to cyclic lateral loading.

Few-Layered MoS2 Nanostructures for Highly Efficient Visible Light Photocatalysis

Dan Li,Jianwei Li,Caiqin Han,Xinsheng Zhao,Haipeng Chu,Wenyan Lei,Xinjuan Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.10

Few-layered MoS2 nanostructures were successfully synthesized by a simple hydrothermal method without the addition of any catalysts or surfactants. Their morphology, structure and photocatalytic activity were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, electrochemical impedance spectra and UV-Vis absorption spectroscopy, respectively. These results show that the MoS2 nanostructures synthesized at 180℃ exhibit an optimal visible light photocatalytic activity (99%) in the degradation of Rhodamine B owing to the relatively easier adsorption of pollutants, higher visible light absorption and lower electron–hole pair recombination.