A Study of China’s Regional Development Policy Trends and Income Inequality

Hu, PengFei,정홍열 원광대학교 한중관계연구원 2022 韓中關係硏究 Vol.8 No.2

Since the implementation of policy pertaining to reform and opening-up in 1978, the Chinese economy has achieved rapid growth. However, behind this rapid growth, there has emerged a phenomenon of income inequality among different regions in China. This phenomenon has become increasingly prominent and aroused concerns. This paper investigates into the development, changing trend, and degree of income inequality in the different regions (provinces) of China based on certain panel data drawn between 1952 and 2019. The second part of this paper analyzes the evolution of the Chinese regional development policies since the founding moment of new China. The third part of this paper studies the problems and methods emerging from existing researches. The fourth part of this paper conducts empirical analysis with respect to the outcome of income inequality which exists among the different regions of China. The fifth part of this paper tries to explain the overall change that takes place with respect to the regional income inequality based on the preceding inferences. This change comes about through influence of regional policy initiated by the Chinese government. Finally, this paper proposes some countermeasures amid the reduction of income inequality among the different regions of China so as to prevent it from expanding.

An Empirical Study on Environmental Kuznets Curve in China

Hu, PengFei,정홍열,Princess Shahida Haque 중국지역학회 2022 중국지역연구 Vol.9 No.1

For economic growth and environmental pollution, we often only pay attention to the one-way effect of the economy on pollution but ignore the reverse effect of pollution on growth, which makes the form of Environmental Kuznets Curve diverse. In order to comprehensively investigate the two-way impact and dynamic relationship between them, based on the panel data of provinces and cities in China from 2000 to 2019, this paper first uses the three-stage least squares (3LSL) estimation simultaneous equations model to investigate the shape of China's Environmental Kuznets environmental curve, and the influence of pollution emission control variables on pollution emission and the output effect of three environmental pollution indicators are analyzed, then uses the state-space model to analyze further the dynamic correlation between economic growth and environmental pollution. Industrial pollution emission is closely related to industrial development, which plays a crucial role in China’s macroeconomic development. Therefore, this paper selects three indicators: industrial wastewater discharge, industrial sulfur dioxide discharge, and industrial solid waste to reflect the degree of environmental pollution. The empirical results show that the relationship between industrial wastewater discharge, industrial sulfur dioxide discharge, industrial solid waste production, and per capita GDP conforms to the Environmental Kuznets inverted U-curve. With economic growth and income level improvement, the environmental quality tends to deteriorate in the initial development stage. When the economy develops to a certain level, the state of environmental deterioration peaks, and then the environmental quality tends to improve. The direction and degree of the impact of various pollutants on economic growth are different. the two-way dynamic impact relationship between economic growth and environmental pollution is studied based on the state-space model. The empirical results show that there is a dynamic correlation between economic growth and environmental pollution. Especially after 2012, the elasticity of pollution to economic growth tends to be stable, while the elasticity of economic growth to pollution is increasing, indicating that China's pollutant control has achieved good results in recent years. The coordination between environmental protection and economic growth has been enhanced.

Development and Testing of a 10 kV 1.5 kA Mobile DC De-Icer based on Modular Multilevel Converter with STATCOM Function

Pengfei Hu,Yiqiao Liang,Yi Du,Renming Bi,Chonglin Rao,Yang Han 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

This paper introduces the development of a de-icer based on a full-bridge modular multilevel converter (FMMC). The FMMC can generate a wide range of DC voltages owing to its modularity, scalability, and redundancy, which makes it suitable for ice-melting applications. First, operating principles and voltage ranges are analyzed when FMMC is applied as a mobile de-icer. Second, two new startup strategies, constant modulation index and constant power startup strategies, are proposed. Third, the main control strategies of the de-icer are proposed. Fourth, a novel rated-current zero-power test scheme is proposed to simplify test conditions. Finally, a 10 kV 1.5 kA mobile MMC de-icer is designed and built, and experiments are carried out to validate the proposed startup, control strategies, and rated-current zero-power test scheme.

Development and Testing of a 10 kV 1.5 kA Mobile DC De-Icer based on Modular Multilevel Converter with STATCOM Function

Hu, Pengfei,Liang, Yiqiao,Du, Yi,Bi, Renming,Rao, Chonglin,Han, Yang The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

This paper introduces the development of a de-icer based on a full-bridge modular multilevel converter (FMMC). The FMMC can generate a wide range of DC voltages owing to its modularity, scalability, and redundancy, which makes it suitable for ice-melting applications. First, operating principles and voltage ranges are analyzed when FMMC is applied as a mobile de-icer. Second, two new startup strategies, constant modulation index and constant power startup strategies, are proposed. Third, the main control strategies of the de-icer are proposed. Fourth, a novel rated-current zero-power test scheme is proposed to simplify test conditions. Finally, a 10 kV 1.5 kA mobile MMC de-icer is designed and built, and experiments are carried out to validate the proposed startup, control strategies, and rated-current zero-power test scheme.

An improved design of inserted tooth finishing hob for involute gears

Hu Yong,Xiang Mingjun,Qiu Xing,Song Pengfei,Song Jingan,Peng Fuhua 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8

Gear hobs are widely used to machine involute gears. However, using Archimedes worm as a base worm of the gear hob, which iscommon used in industry, leads to the generating of theoretical error of the gears. Even though this error can be eliminated by using theaccurate involute base worm or be greatly reduced by complicated modification of the shape of cutting edges, the manufacturing cost isvery high. Reported in this paper is an improved design of inserted tooth finishing hob for involute gears on a conventional hobbing machineaiming to eliminate this error in an economical way. For that purpose, both descriptive-geometry-based method and mathematicalanalyzing are employed to illustrate the major parameters of the base worm and the formation and parameters of the inserted tooth finishinghob. In addition, an approximating formation of the flank for the convenience of grinding the inserted tooth finishing hob is proposedand the errors that this substitution arc surface is discussed. Ultimately, the other advantages of this inserted finishing hob are demonstrated.

High-efficiency removal of phenol and coking wastewater via photocatalysis-Fenton synergy over a Fe-g-C3N4 graphene hydrogel 3D structure

Jinshan Hu,Pengfei Zhang,Jifang Cui,Weijia An,Li Liu,Yinghua Liang,Qingbin Yang,Hongjun Yang,Wenquan Cui 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-

To achieve rapid separation of electron-hole pairs and improve photocatalytic degradation activity, theFe-g-C3N4 reduced graphene hydrogel (rGH/Fe-g-C3N4) with a 3D network structure was fabricated viathe hydrothermal method. Using visible light irradiation, H2O2 was added to form a photocatalysis-Fenton synergy system. The results showed that the synergistic degradation rate constant of 10% rGH/Feg-C3N4 was 52% higher than that of the multiphase Fenton reaction and 1.5 times higher than that of theFe-g-C3N4. In the seventh cycle, the catalytic efficiency was still as high as 86.9%. Based on the optimizedconditions from phenol degradation, the system was further applied to coking wastewater treatment,and the degradation efficiency of TOC and COD in 60 min reached 66.3% and 68.1%, respectively. Such highand stable degradation performance was ascribed to the synergy effect of photocatalysis and Fenton. Because of the photogenerated electrons not only can promote the Fe3+/Fe2+ cycle, accelerate thedecomposition of H2O2, but also can quickly transfer to graphene and directly decompose H2O2 to formOH. Thus, a large amount ofOH were generated through the two different channels, which greatlyimprove the degradation efficiency. Furthermore, rGH/Fe-g-C3N4 can be regenerated usingfilters withoutthe need for additional complicated processing. This work provides an effective strategy for the deeptreatment of industrial wastewater.

Numerical Study on Temperature Distribution of High-strength Concrete-filled Steel Tubes Subjected to a Fire

Ying Hu,Pengfei Zhao,Bo Yang,Guoxin Dai 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.4

High-strength concrete-filled steel tube (CFST) columns offer a number of benefits and are widely used in high-rise building construction. This paper presents a brand new thermal modeling approach in comparison with tremendous test data for the heat transfer analysis. A heat transfer model has been developed to predict the thermal response of high-strength CFST columns under standard fire conditions with consideration of a number of parameters: steel and furnace emissivity, thermal interface conductance and concrete strength. The verified numerical models discussed the variation of emissivity of steel surfaces and thermal interface conductance in fire. It can be concluded that the influence of emissivity and thermal interface conductance is considerable in the numerical analysis. It is also demonstrated that thermal behavior of high-strength CFST columns subjected to fire during heating and cooling stages, and providing the guidance on predicting thermal response of high-strength concrete-filled steel tube columns.

Influence of temperature on the carbonization context, oxidation properties and mechanism of a porous biomorphic carbon template

Pengzhao Gao,Pengfei Hu,Wenxiang Wang,Weiwei Gong 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.3

A porous biomorphic carbon template (BCT) was prepared using a carbonized native aspen under an Ar atmosphere. Microstructural properties of the BCT were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Non-isothermal oxidation properties and the mechanism of the BCT formation were studied by thermogravimetric analysis (TGA). Experimental results show that microstructure of the BCT exhibits a honeycomb interconnected porous network and double-peaked distribution of pore diameters. The BCT phase belongs to amorphous carbon, with an increase of the carbonization temperature, the (002) peak of the XRD spectrum becomes stronger, the interplanar spacing decrease, and the structure of BCT slowly evolved towards that of ideal graphite. The non-isothermal oxidation process of BCT is controlled by a chemical reaction and gas diffusion together, and the two stages have different influences on the whole reaction rate with an increase of the conversion (a). The corresponding activation energy (E a) is also calculated.

Integrate Advantage of Geographic Routing and Reactive Mechanism for Aeronautical Ad Hoc Networks

Xiaoheng Tan,Xiaonan Hu,Pengfei Qu,Zhengnan Zhu,Yan Zhang 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.7

Large scale range and high dynamic topology are the two major features of Aeronautical Ad Hoc Networks (AANETs), which present severe challenges to provide efficient and reliable data packet delivery in aviation communication networks. Geographic routing has been studied as an attractive option for routing in aeronautical networks due to its simplicity and scalability. However there are still some problems such as low packet delivery ratio and less reliability for long dynamic links. In this paper, we improve the greedy forwarding strategy and start with the idea of integrating reactive routing mechanism with geographic routing protocol, referred to as IRG (Improved Reactive and Geographic) routing protocol. Variety simulations have been performed to evaluate the performance of the proposed routing protocol, and the results show that it can increase the packet delivery ratio efficiently.

Thickness effect on the stability of unipolar resistance switching in tin ferrite thin films

Guodong Gong,Changjin Wu,Pengfei Hu,Ying Li,Namic Kwon,Chunli Liu 한국물리학회 2016 Current Applied Physics Vol.16 No.9

We report the reproducible unipolar resistance switching behavior in Pt/SnFe2O4/Pt structures. The amorphous SnFe2O4 thin film was spin-coated on the Pt/TiO2/SiO2/Si substrate by a sol-gel method. The current-voltage characterization showed that as the spin coating cycles increased, the resistive switching (RS) characteristics became stable, and an excellent RS performance showing uniform set voltage distribution, stable resistance of both low resistance and high resistance states, and narrow reset current distribution can be obtained in SFO films with a thickness about 220 nm. Based on the conducting filament model, the variation of the RS behavior was ascribed to the increase of the electroforming voltage in the thicker films, which consequently induced more oxygen vacancies to participate in the RS process. Our results indicated that the electroforming voltage performs a significant role in the RS properties of the amorphous SnFe2O4 and the optimized RS behavior through the regulation of preparation process can be used for the resistance random access memory applications.