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Social stratification and housing wealth inequality in transitional urban China
Chengdong Yi,Yuyao Li,Yourong Wang,Haiyuan Wan 서울시립대학교 도시과학연구원 2021 도시과학국제저널 Vol.25 No.1
As the Chinese economy continues to transform, housing wealth has gradually become the single largest asset in most urban households. At the same time, housing wealth inequality has worsened, and housing stratification has become a major form of social stratification in the country. However, there is no empirical evidence of temporal changes in housing wealth inequality and their implications on social stratification. Pooling three waves of survey data from the 1995, 2008, and 2013 iterations of the Chinese Household Income Project, we present a dynamic image of housing wealth inequality in urban China. The results suggest that housing wealth inequality decreased initially and increased later. To further illustrate how housing wealth is stratified by social groups, we conducted regression analyses and structural tests, which revealed three main results: the education level of the household head has an increasingly positive impact on housing wealth inequality; a household head with superior occupational status generally has an advantage in terms of possession of housing wealth with no evidence that this advantage diminishes during the transitional period; and income has a significant, positive impact on housing wealth, and this effect exhibited an increasing trend over time. These results imply that the temporal changes in housing wealth inequality exacerbated the social stratification in transitional urban China.
Chengdong Yuan,Dmitrii A. Emelianov,Mikhail A. Varfolomeev,Mustafa Abaas 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
The combustion behavior of aromatics (p-quaterphenyl, thioxanthone, pyrene) and their interaction withn-alkane (tetracosane) were investigated by high-pressure differential scanning calorimetry (HP-DSC). Tetracosane only showed low-temperature oxidation (LTO), while p-quaterphenyl and thioxanthone onlyshowed high-temperature oxidation (HTO). Pyrene exhibited a unique middle-high temperatureoxidation (M-HTO). Tetracosane significantly promoted the HTO of p-quaterphenyl and thioxanthone,and shifted their HTO into lower temperatures. While p-quaterphenyl and thioxanthone did notsignificantly affect the occurrence of the LTO of tetracosane, but they did reduce the heat release andreaction rate of the LTO of tetracosane. The co-oxidation of tetracosane and pyrene triggered an intenseinteraction that exerts a strong inhibition on the LTO of tetracosane, and induces an explosive oxidationreaction followed by a mild oxidation from 280 to 325 C. The intense interaction also significantlypromoted the HTO of the pyrene. In general, the interaction strength is in turn pyrene + tetracosane >thioxanthone + tetracosane > p-quaterphenyl + tetracosane. Due to the strong interaction between thealkane and aromatics during their co-oxidation, the additivity of heat release in both LTO and HTO cannotbe applied in terms of reaction process as well as total heat release.
Chengdong Feng,Ming Gu 한국풍공학회 2020 Wind and Structures, An International Journal (WAS Vol.30 No.1
Modelling incompressible, neutrally stratified, barotropic, horizontally homogeneous and steady-state atmospheric boundary layer (ABL) is an important aspect in computational wind engineering (CWE) applications. The ABL flow can be viewed as a balance of the horizontal pressure gradient force, the Coriolis force and the turbulent stress divergence. While much research has focused on the increase of the wind velocity with height, the Ekman layer effects, entailing veering — the change of the wind velocity direction with height, are far less concerned in wind engineering. In this paper, a modified k-epsilon model is introduced for the ABL simulation considering wind veering. The self-sustainable method is discussed in detail including the precursor simulation, main simulation and near-ground physical quantities adjustment. Comparisons are presented among the simulation results, field measurement values and the wind profiles used in the conventional wind tunnel test. The studies show that the modified k-epsilon model simulation results are consistent with field measurement values. The self-sustainable method is effective to maintain the ABL physical quantities in an empty domain. The wind profiles used in the conventional wind tunnel test have deficiencies in the prediction of upper-level winds. The studies in this paper support future practical super high-rise buildings design in CWE.
The Syntax of Multiple-sluicing in Mandarin Chinese
Chengdong Wang,Jingquan Han 한국생성문법학회 2018 생성문법연구 Vol.28 No.4
Multiple-sluicing in Chinese falls into two types: pseudo multiple-sluicing and typical multiple-sluicing. In the former, the two simplex wh-arguments have the basic structure of ‘pro + shi ‘be’ + wh-phrase’ and are coordinated by a covert conjunction word. Typical multiple-sluicing can be found in the following three forms: the first one includes two discourse-linked wh-arguments, the second consists of two complex wh-adjuncts and the third is composed of a discourse-linked wh-argument and a complex wh-adjunct. This article argues that while no overt wh-movement is involved in the derivation of pseudo multiple-sluicing, typical multiple-sluicing does. Specifically, topic- prominent wh-phrases and focus-prominent wh-phrases move to [Spec, TopP] and [Spec, FocP] respectively, and a subsequent deletion of IP at PF derives a well-formed typical multiple-sluicing.
ChengDong Zhang,GueeSang Lee 한국콘텐츠학회 2012 International Journal of Contents Vol.8 No.1
Character segmentation is a preprocessing step in many offline handwriting recognition systems. In this paper, Chinese characters are categorized into seven different structures. In each structure, the character size with the range of variations is estimated considering typical handwritten samples. The component removal and merge criteria are presented to remove punctuation symbols or to merge small components which are part of a character. Finally, the criteria for segmenting the adjacent characters concerning each other or overlapped are proposed.
Text Location and Extraction for Business Cards Using Stroke Width Estimation
Chengdong Zhang,GueeSang Lee 한국콘텐츠학회 2012 International Journal of Contents Vol.8 No.1
Text extraction and binarization are the important pre-processing steps for text recognition. The performance of text binarization strongly related to the accuracy of recognition stage. In our proposed method, the first stage based on line detection and shape feature analysis applied to locate the position of a business card and detect the shape from the complex environment. In the second stage, several local regions contained the possible text components are separated based on the projection histogram. In each local region, the pixels grouped into several connected components based on the connected component labeling and projection histogram. Then, classify each connect component into text region and reject the non-text region based on the feature information analysis such as size of connected component and stroke width estimation.
Na Liu,Chengdong Wu,Cailian Gu 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.5
Photovoltaic power generation is clean, non-polluting, inexhaustible, but its characteristics of randomness, volatility and intermittent also produce its negative effects on power system economic, safe and reliable operation, which cannot be ignored. Storage battery in photovoltaic power generation system can not only absorb excess energy reserves, but also can stabilize the fluctuation, cut a peak to fill the valley and the stable voltage, it is very important and key part, At the same time, the energy storage capacity of the rational allocation of system not only for the photovoltaic power generation system of construction cost, also affects the performance and the service life of the system. This paper is based on the amount of solar radiation data of Liaoning area, proposed the hypothesis that PV fluctuation characteristics accord with normal distribution characteristics ,and fitted by normal distribution probability density function, verified the assumption of normal distribution, and proposed a selection strategy of energy storage power based on the normal distribution, Established mathematical model of battery energy storage capacity configuration, and regards the total power standard deviation, fluctuation of power capacity and power fluctuation rate as evaluation indicators to measure the effects of the long-term and short-term fluctuation of the storage battery on stabilizing fluctuation of photovoltaic power generation , through the examples and simulation proved that the model is correct and reasonable.
Na Liu,Chengdong Wu,Cailian Gu 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.5
The charging and discharging control and management of the energy storage battery are the key links to influence the performance and the service life of the battery in photovoltaic system. According to the inherent characteristics of power terminal of photovoltaic power generation system, this paper designs a control operation mode of a paralleling and independent controlling structure, uses charging and discharging controlled strategy by time-sharing grouped , combines the constant current charging, pulse charge and floating charge trickle charge. The main features of the integrated control strategy method is capable of more efficient utilization intensity of solar radiation, more reasonable control of charging storage energy system. According to the improvement of the structural design of the existing project 100KW photovoltaic engineering power system, and observation and analysis about a large amount of data, the charging effect is obviously improved compared with the former system.
( Chunhe Shi ),( Chengdong Wu ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.5
In order to judge that whether the vehicles in different images which are captured by surveillance cameras represent the same vehicle or not, we proposed a novel vehicle face recognition algorithm based on improved Nonnegative Matrix Factorization (NMF), different from traditional vehicle recognition algorithms, there are fewer effective features in vehicle face image than in whole vehicle image in general, which brings certain difficulty to recognition. The innovations mainly include the following two aspects: 1) we proposed a novel idea that the vehicle type can be determined by a few key regions of the vehicle face such as logo, grille and so on; 2) Through adding weight, sparseness and classification property constraints to the NMF model, we can acquire the effective feature bases that represent the key regions of vehicle face image. Experimental results show that the proposed algorithm not only achieve a high correct recognition rate, but also has a strong robustness to some non-cooperative factors such as illumination variation.