Dong Liu

State Grid Corporation of China (China)

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Zhe Chen

Aalborg University

Yanbo Wang

Aalborg University

Fujin Deng

Southeast University

Wenbin Yuan

Xidian University

Qi Zhang

China University of Mining and Technology

Jiahui Wu

Aalborg University

Mei Su

Central South University

Chuan Xie

University of Electronic Science and Technology of China

Guo Xu

Central South University

Longze Kou

State Grid Corporation of China (China)

Cooperative Institutions

Chinese Academy of Sciences

Shanghai Jiao Tong University

State Grid Corporation of China (China)

Tsinghua University

Central South University

North China Electric Power University

Wuhan University

Zhejiang University

University of Chinese Academy of Sciences

China Southern Power Grid (China)

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Profitability in Asset Pricing Models for Chinese Equities 1996-2016

Journal of Economics and Public Finance (2018)

Dong Liu

<p><em>I follow Novy Marx (2011, 2013) to investigate and compare firms’ gross profit, operating leverage as predictors of returns for a cross-section of traded Chinese equities spanning from1996-2016. I use portfolio tests and Fama-MacBeth regressions, find that gross-profit-to-market-capitalization ratios significantly predict returns on sampled stocks. I also find that sorting portfolios by gross profitability and size outperforms in the Chinese market. Hence, I create a Market-Profitability-Size model that captures profitability and size premium among returns of sampled stocks. Based on Gibbons-Ross-Shanken test and economic value, I demonstrate that my enhanced model outperforms Fama-French multiple-factor model in isolating influences on equity returns.</em></p>

Market capitalization

Value premium

Capitalization

10.22158/jepf.v4n2p118

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Accelerating HMMer on FPGAs using systolic array based architecture

Sun Yan-teng Peng Li Guochang Gu Yuan Wen Yuan Liu

HMMer is a widely-used bioinformatics software package that uses profile HMMs (Hidden Markov Models) to model the primary structure consensus of a family of protein or nucleic acid sequences. However, with the rapid growth of both sequence and model databases, it is more and more time-consuming to run HMMer on traditional computer architecture. In this paper, the computation kernel of HMMer, P7Viterbi, is selected to be accelerated by FPGA. There is an infrequent feedback loop in P7Viterbi to update the value of beginning state (B state), which limits further parallelization. Previous work either ignored the feedback loop or serialized the process, leading to loss of either precision or efficiency. Our proposed syslolic array based architecture with a parallel data providing unit can exploit maximum parallelism of the full version of P7Viterbi. The proposed architecture speculatively runs with fully parallelism assuming that the feedback loop does not take place. If the rare feedback case actually occurs, a rollback mechanism is used to ensure correctness. Results show that by using Xilinx Virtex-5 110T FPGA, the proposed architecture with 20 PEs can achieve about a 56.8 times speedup compared with that of Intel Core2 Duo 2.33 GHz CPU.

Speedup

Rollback

Kernel (algebra)

Nested loop join

Viterbi algorithm

10.1109/ipdps.2009.5160927

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Citations (16)

A Robust Voltage Sensorless Droop Control Strategy of Microgrid Against Parameters Perturbation

Wenbin Yuan Yanbo Wang Dong Liu Fujin Deng Zhe Chen

This paper presents a robust voltage sensorless droop control strategy of microgrid to implement the power sharing control of paralleled inverters in microgrids without using the direct voltage measurement. The virtual flux (VF) algorithm is first proposed to estimate the output voltage of inverters without using voltage measurement. Then, the effect of inductor nonlinearity on voltage estimation is analyzed and mitigated by establishing inductor model considering soft-saturation characteristic. Furthermore, the robust voltage sensorless droop control strategy is developed to implement the power control based on the proposed voltage estimation in power control loop and voltage control loop. Simulation results show that the proposed droop control strategy is able to perform desirable control performance without using voltage measurement even if the parameters perturbation happens, which thus improves system reliability and reduces the hardware cost of microgrid.

Microgrid

10.1109/ipemc-ecceasia48364.2020.9367900

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Citations (1)

Supplementary material to "Water clarity annual dynamics (1984–2018) dataset across China derived from Landsat images in Google Earth Engine"

Hui Tao Kaishan Song Ge Liu Qiang Wang Zhidan Wen

CLARITY

Dynamics

10.5194/essd-2021-227-supplement

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Coupled‐line trans‐directional coupler with arbitrary power divisions for equal complex termination impedances

IET Microwaves Antennas & Propagation (2018)

Hongmei Liu Chenhui Xun Shaojun Fang Zhongbao Wang Dong Liu

In the study, a coupled line trans‐directional (CL‐TRD) coupler that allows for equal complex termination impedances with arbitrary power divisions is presented. It is composed of two pairs of coupled lines with an overall electrical length of 90°, two types of shunt capacitors and three pairs of short‐circuited stubs. By adjusting the electrical length of each short‐circuited stub, as well as the values of the shunt capacitors, arbitrary equal complex termination impedances and power divisions are achieved. Moreover, since capacitors are shunted between the coupled lines, the proposed CL‐TRD coupler has an inherent feature of dc blocking. Design equations for the CL‐TRD were derived using even–odd mode decomposition analysis. To validate the theory, several numerical examples extracted from the design procedure were listed. Eventually, two prototypes of the proposed CL‐TRD coupler are fabricated, and experiments are carried out. The measured results indicate that the coupler is able to realise arbitrary power divisions for equal complex termination impedance with good matching and isolation.

Line (geometry)

10.1049/iet-map.2018.5432

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Citations (6)

An LLC-DAB Bidirectional DCX Converter With Wide Load Range ZVS and Reduced Switch Count

IEEE Transactions on Power Electronics (2021)

Yuefeng Liao Guo Xu Tao Peng Yao Sun Dong Liu

An LLC-DAB bidirectional converter with reduced switch count as a DC-DC transformer (DCX) is proposed in this paper. It can achieve voltage regulation, full load range zero voltage switching (ZVS) for eight main switches and wide load range ZVS for four auxiliary switches, with consideration of the switch junction capacitors under different power direction.A small portion of total power is transferred through an auxiliary DAB circuit with the purpose of achieving voltage regulation and bidirectional power conversion; The main power are transferred through LLC circuit with easy PWM modulation scheme and high conversion efficiency. Different from the existing LLC-DAB DCX structure, the two secondary side transformer outputs are in parallel, and connected to the same full-bridge circuit. In this way, the auxiliary DAB circuit can not only adjust the output voltage, but also can inject current into the secondary side to help achieving ZVS of switches without synchronous rectifier (SR) circuit. The converter operation principle is analyzed under different power directions, and ZVS is analyzed with the consideration of all the switch junction capacitors. Based on these analysis, the design consideration are introduced. Finally, a 2 kW prototype is built up to verify the effectiveness of the proposed solution.

Rectifier (neural networks)

10.1109/tpel.2021.3105828

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Citations (18)

Non-Hermitian state control beyond conventional adiabatic theorem

Dong Liu

Non-Hermitian quantum systems, often characterized by gain and loss terms, have recently been developed, offering a new dimension for quantum state control by expanding the Hermitian Hamiltonian into the non-Hermitian regime. In this thesis, we aim to explore approaches for state control with non-Hermiticity that go beyond the conventional adiabatic theorem. Specifically, on the one hand, we focus on achieving state control through nonadiabatic transitions (NATs) near an exceptional point (EP, a non-Hermitian degeneracy), which arise from the competition between interband coupling and complex dynamic phase factors. Unlike NATs in Hermitian systems, which are typically triggered by strong interband coupling with rapidly varying parameters, these transitions are more robust, having no re...[ Read more ]

Hamiltonian (control theory)

Avoided crossing

10.14711/thesis-991013340440003412

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Advanced sensorless power control strategy of renewable microgrids for reliability enhancement

Applied Energy (2019)

Ping Liu Yanbo Wang Jie Li Dong Liu

Microgrid

10.1016/j.apenergy.2019.113850

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Citations (8)

Identification method of cascading failure in high-proportion renewable energy systems based on deep learning

Energy Reports (2021)

Yuhong Zhu Xiaoming Liu Bo Chen Donglei Sun Dong Liu

A high proportion of new energy sources are connected to the grid, which not only alleviates the energy shortage, but also brings hidden dangers to the safe and stable operation of the grid. Aiming at the inadequate consideration of uncertainty caused by new energy sources such as wind power being connected to the grid, a method for identifying voltage-dominant cascading fault types is proposed. A voltage-dominant fault analysis model in the sense of probability is established. Based on the fault data, the nonlinear mapping relationship between the initial fault and the fault propagation characteristics is established through the neural network. Finally, the effectiveness of the method proposed in this paper is verified in the IEEE39-bus system, and the simulation results show that the method proposed in this paper can effectively identify the fault types of high-proportion new energy systems.

Identification

Economic shortage

Cascading failure

10.1016/j.egyr.2021.11.022

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Citations (7)

Study on Forming and Evolving Mechanism of Innovation Dynamics in China's LICs: From a Industrial Technology Track Perspective

Contemporary Finance and Economics (2007)

Dong Liu

The lack of ITT and the low cycling deadlock is a key factor responsible for the insufficiency of innovation dynamics and the weak industrial upgrading in China's LICs.Under the condition of modulation,the competitive advantage of LICs is reflected in the monopoly and control of ITT.Through establishing a 3-force model and decomposing primary factors,the paper elaborates on the key factors determining the formulation and evolvement of the ITT mechanism of Chain's LICs in such areas as institution,technology,industries and opening to global industrial chain during the transition period.The paper points out that the business network of the core enterprises has an important role to play in promoting the formulation and evolvement of the ITT mechanism in Chain's LICs.Finally,the paper introduces three platforms which can be used for the practical purpose of promoting the formulation and evolvement of the ITT in the traditional local LICs of China,including innovation transferring,intermediary technology transfer and technology diffusing.

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