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Liang Dai,Weifeng Lü,Mi Lin 대한전자공학회 2020 Journal of semiconductor technology and science Vol.20 No.4
This study compares junctionless (JL) and inversion-mode (IM) dual-metal gate (DMG) nanowire transistors in terms of their performance fluctuations caused by work-function variation (WFV) through computer-aided-design simulation, To the best of our knowledge, this is the first of such an investigation. From the variability of the performance parameters, including the threshold voltage (VTH), transconductance (gm), saturation current (Isat), and subthreshold slope (SS), we observe that IM devices have stronger immunity to WFV than JL devices in terms of VTH and SS, whereas JL devices perform better in terms of Isat and gm from the relative fluctuation perspective. Moreover, the impact of WFV is found to become more severe as the ratio of the metal gate near the source to the entire metal gate decreases. In summary, our study can serve as a reference for optimizing the distribution of the two metals in the design of JL and IM DMG nanowire transistors.
Dai Liang,Derudder Ben,Cao Zhan,Ji Yufan 서울시립대학교 도시과학연구원 2023 도시과학국제저널 Vol.27 No.3
Drawing on data on scientific co-publications derived from the Web of Science for the periods 2002–2006 and 2012–2016, we construct and analyse a key element of China's intercity knowledge networks (CIKNs): scientific collaboration networks. Employing network-analytical and exponential random graph modelling techniques, we examine the evolving structures and driving mechanisms underlying these CIKNs. Our results show that the density of the CIKNs has significantly increased over time. CIKN flows are dense in the Southeastern but sparse in the Northwestern part of China, with the Hu Line acting as a clearly visible border. As the dominant knowledge centre, Beijing is involved in scientific collaboration networks throughout the country, with the diamond-shaped structure anchored by Beijing-Shanghai-Guangzhou-Chengdu becoming evident. We find that preferential attachment and transitivity are significant endogenous processes driving scientific collaboration, while a city's administrative level and R&D investment are the strongest exogenous factors. The impact of GDP and geographical proximity is limited, with institutional proximity being the most sizable of the well-known suite of proximity effects.
Dai, Hong-Liang,Rao, Yan-Ni Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.1
An analytical method is presented to investigate electromagnetothermoelastic behaviors of a hollow sphere composed of functionally graded piezoelectric material (FGPM), placed in a uniform magnetic field, subjected to electric, thermal and mechanical loads. For the case that material properties obey an identical power law in the radial direction of the FGPM hollow sphere, exact solutions for electric displacement, stresses, electric potential and perturbation of magnetic field vector in the FGPM hollow sphere are determined by using the infinitesimal theory of electromagnetothermoelasticity. Some useful discussion and numerical examples are presented to show the significant influence of material inhomogeneity. The aim of this research is to understand the effect of composition on electromagnetothermoelastic stresses and to design optimum FGPM hollow spheres.
Thermoviscoelastic dynamic response for a composite material thin narrow strip
Hong-Liang Dai,Li-Li Qi,Hai-Bo Liu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2
Based on von Karman nonlinear strain-displacement relationships and classical thin plate theory, a list of nonlinear dynamic equilibriumequations for a viscoelastic composite material thin narrow strip under thermal and mechanic loads are deduced. According to thematerial constitutive relationship and the relaxation modulus in the form of the Prony series, combing with the Newmark method and theNewton-cotes integration method, a new numerical algorithm for direct solving the whole problem in the time domain is established. Byapplying this numerical algorithm, the viscoelastic composite material thin narrow strip as the research subject is analyzed systematically,and its rich dynamical behaviors are revealed comprehensively. To verify the accuracy of the present work, a comparison is made withpreviously published results. Finally, the viscoelastic composite material thin narrow strip under harmonic excitation load and impactload are discussed in detail, and many valuable thermoviscoelastic dynamic characteristics are revealed.
Investigation of mechanical behavior for a rotating FGM circular disk with a variable angular speed
Ting Dai,Hong-Liang Dai 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9
In this paper, the displacement and stress distribution in a rotating FGM (Functionally graded material) circular disk with a variableangular speed are studied. The modulus of elasticity and mass density of the circular disk are assumed to vary along its radius and relateto the volume fraction of the materials, while the Poisson’s ratio remains to be a constant. The motion equations of the FGM rotatingcircular disk are simplified into boundary value problems of ordinary differential equation, which are solved by Runge-Kutta method,and the whole problem is solved by utilizing shooting method. Numerical results show that the functionally graded index, angular speedsand geometric shape all have significant effect on the mechanical behaviors of the rotating FGM circular disk. The results of this studymay be useful for other investigations of a rotating FGM circular disk.
Jia-Liang Dai(다이지아리앙),Seung-Teck Oh(오승택),Jung-Ho Ahn(안정호),Ho-Jun Lee(이호준),Chang-Seong Jin(진창성),Ju Lee(이주) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7
This paper presents the novel Maximum Power Point Tracking (MPPT) algorithm for a solar Photovoltaic (PV) to maintain the system uptime, in case of rapi-dly changing illumination condition. Although the Microcontroller Unit (MCU) with appropriate of MPPT algorithm are favored because of their flexibility and compatibility[1], but under the aforementioned conditions, preserving the operation of the motor still requires high efficiency and high stability. Simultaneously, in the conventional systems, batteries are used to perform two essential functions: power buffer and energy storage bank[2]. But it will also increase the cost, we focus on the MPPT algorithm with speed control instead of the batteries in this paper.
Hong-Liang Dai,Yan-Ni Rao 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.1
An analytical method is presented to investigate electromagnetothermoelastic behaviors of a hollow sphere composed of functionally graded piezoelectric material (FGPM), placed in a uniform magnetic field, subjected to electric, thermal and mechanical loads. For the case that material properties obey an identical power law in the radial direction of the FGPM hollow sphere, exact solutions for electric displacement, stresses, electric potential and perturbation of magnetic field vector in the FGPM hollow sphere are determined by using the infinitesimal theory of electromagnetothermoelasticity. Some useful discussion and numerical examples are presented to show the significant influence of material inhomogeneity. The aim of this research is to understand the effect of composition on electromagnetothermoelastic stresses and to design optimum FGPM hollow spheres.
Liang, Weizheng,Gao, Min,Lu, Chang,Zhang, Zhi,Chan, Cheuk Ho,Zhuge, Lanjian,Dai, Jiyan,Yang, Hao,Chen, Chonglin,Park, Bae Ho,Jia, Quanxi,Lin, Yuan American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.9
<P>Vanadium dioxide (VO<SUB>2</SUB>) is a strong-correlated metal-oxide with a sharp metal-insulator transition (MIT) for a range of applications. However, synthesizing epitaxial VO<SUB>2</SUB> films with desired properties has been a challenge because of the difficulty in controlling the oxygen stoichiometry of VO<SUB><I>x</I></SUB>, where <I>x</I> can be in the range of 1 < <I>x</I> < 2.5 and V has multiple valence states. Herein, a unique moisture-assisted chemical solution approach has been developed to successfully manipulate the oxygen stoichiometry, to significantly broaden the growth window, and to significantly enhance the MIT performance of VO<SUB>2</SUB> films. The obvious broadening of the growth window of stoichiometric VO<SUB>2</SUB> thin films, from 4 to 36 °C, is ascribed to a self-adjusted process for oxygen partial pressure at different temperatures by introducing moisture. A resistance change as large as 4 orders of magnitude has been achieved in VO<SUB>2</SUB> thin films with a sharp transition width of less than 1 °C. The much enhanced MIT properties can be attributed to the higher and more uniform oxygen stoichiometry. This technique is not only scientifically interesting but also technologically important for fabricating wafer-scaled VO<SUB>2</SUB> films with uniform properties for practical device applications.</P> [FIG OMISSION]</BR>