Assessment of Projected Climate Change on Soil Organic Carbon and Crop Yield Based on The Recent 20 Yrs Fertilization Applications in the Loess Plateau, China

Haixin Chen,Ying Zhao,Hao Feng,Benhua Sun 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Epidemiological Factors of Stroke: A Survey of the Current Status in China

Haixin Sun,Xinying Zou,Liping Liu 대한뇌졸중학회 2013 Journal of stroke Vol.15 No.2

Stroke is the leading cause of death in China and confers a huge burden and effort on patients and health professionals. China has the world’s largest population and has been experiencing a rapid economic development. In this article, we review the current status of stroke epidemiological features and risk factors, and the recently ongoing stroke epidemiological survey in China. Epidemiological studies suggested that stroke incidence increases with age and that the elderly population is expected to increase over time in China. Stroke mortality increased gradually from 1990 to 2000 but declined since the beginning of the 21st century, probably related to better control of vascular risk factors and the advances in acute stroke care. The Chinese lifestyle has changed rapidly during the past 3 decades. Moreover, China is a big country with substantial geographic disparities. The geographical variation and chronological trend of vascular risk factors may determine changes in the prevalence and subtypes of stroke in China. In this review, the current Chinese researches on the critical management of stroke and the potential direction and support of the Chinese government are discussed.

Research on Online Sports Metadata Extraction System based on Video Processing Technology

Haixin Yao,Jinmei Shao 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.12

ports video metadata extraction system based on the content of basic goal use an automated or semi-automated interactive means to obtain video data as complete features and attributes for efficient retrieval mechanism. For fast access to video information needed, sports video ornamental create conditions. Firstly, video-based layered metadata description model, we discuss the structure of the video processing technology, and an increase in the time domain and airspace video object motion information on this basis. Low-level visual features for video and high-level semantic features presents a particular field of video information for video implicit hierarchical division method. Video automated visual feature extraction, semantic feature places marked attracted achieve human-computer interaction. Focus on the sports information descriptors and visual content descriptors, descriptor structure video. Video data based on hierarchical structure model and video features standard video content description model.

‘반(半)도시화’ 중국농민공들의 난제 및 시민화에 필요한 입법

황해흠 ( Huang Haixin ),조동제 ( Cho Dong-je ) 경상대학교 법학연구소 2021 法學硏究 Vol.29 No.1

중국에서 개혁개방 정책을 실시한 이후, 많은 수의 농민공은 도시에 진출하게 되었고, 그들은 중국사회의 도시화 및 공업화 발전 그리고 현대화 건설을 위해 크나큰 공헌을 하였다. 하지만 현재 농민공은 도시의 시민도 아니고 진정한 농민도 아닌 ‘반(半)도시화’라는 난감한 처지에 처해져 있다. 이들은 지역과 직업의 변화만 있을 뿐, 사회적 신분은 여전히 농민으로 되어 있으며, 국민으로서의 마땅한 대우를 누리지 못하고 있다. 또한 이들은 현대도시의 행동양식과 가치적 이념이 제대로 형성되지 않은 채 시종일관으로 도시로 부터 방치되어 있다. 중국 농민공 문제는 수억 명의 농민공 및 가족들의 권익과 밀접하게 관계되는 문제이면서 경제이익, 사회권익, 정치권력 및 문화융합 등 종합적인 문제도 내포하고 있다. 본 논문은 중국의 현실에 근거하여, 중국 특유의 농촌인구 유동 과정과 중국 농민공의 실생활 현황에 대한 고찰을 통해 제도적 원인, 농민공의 자체적 원인과 사회적 원인 등 3가지를 분석 및 고찰하여 ‘반(半)도시화’가 형성된 원인에 대하여 설명하는데 있다. 또한 농민공의 취업, 사회적 보장과 공공서비스, 문화와 정치생활 등에 있어서의 현재 ‘반(半)도시화’로 직면하고 있는 난제에 대해서도 분석하고 있다. 기존의 연구 결과에 의하면 농민공이 시민화하는 과정에서 가장 큰 영향을 미치는 요인은 도시와 농촌의 이원적 체제이다. 이러한 이원적 체제가 초래한 결과인 이원적 토지, 호적, 취업, 사회보장 등에 있어서의 제도적 미비와 불공정함이 농민공의 시민화 과정에서 주요한 장애로 여겨지고 있다. 그러므로 이에 관련된 연구를 통하여 농민공의 ‘반(半)도시화’에 놓인 어려움을 해결하는데 있으며, 동시에 농민공의 시민화를 실현하는데 그 취지를 두고 있다. Since China implemented reform and opening-up policy, large quantities of migrant workers have entered into the cities, and they have made great contribution to China’s urbanization, industrialization and modernization. But they are in the embarrassed condition of half-urbanization between city and countryside. They only changed the region and occupation, social identity is still the farmers. They can’t enjoy the national treatment, also did not form the behavior and value concept of modern city, always on the edge of the city. The problem of Chinese migrant workers is closely related to the rights and interests of hundreds of millions migrant workers and their families, and also includes comprehensive problems such as economic benefits, social rights, political power and cultural convergence. This article from the reality of China, through the investigation on the rural population flow and living situation of migrant workers in China, from the three aspects of employment, social security and public services, cultural and political life, analyzes the predicament of semi urbanization, and then from the three aspects of the institutional factors, migrant workers’ own factors and social factors, analyzes the reasons for the formation of semi urbanization. The urban-rural dual system is the biggest influencing factor in the citizenization process of migrant workers. Due to the urban-rural dual system, dual land, household registration, employment, social security and other systems are the major obstacle to the citizenization of migrant workers. On the basis of research and analysis, this dissertation gives aspects of suggestions on the legal construction, to provide theoretical reference for the citizenization process of migrant workers and realize the real citizenization of migrant workers.

PREPARATION AND PROPERTY STUDIES OF Zn 3 P 2 /CALCIUM ALGINATE

JIANFANG JIANG,HAIXIN CUI,YU CAO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.2

Zn 3 P 2 is an acute and e®ective rodenticide used widely to protect grains in stores and domes-tically to kill rodents. This study aims to postpone the time of poisoning symptoms after eatingZn 3 P 2 and improve the e®ect of killing rodents. Zn 3 P 2 /calcium alginate (Zn 3 P 2 /CA) was syn-thesized through the reaction of sodium alginate and calcium chloride by the reversed-phasemicroemulsion method and then loaded with Zn 3 P 2 technical. It was characterized by X-raydi®ractometer, laser particle size analyzer, scanning electron microscope (SEM) and transmissionelectron microscopy (TEM). The drug loading capacity, slow-controlled release performances andtoxic e®ects were also investigated. The results showed that Zn 3 P 2 /CA was spherical, averageparticle size was 353.9 nm, and particle dispersion index (PDI) was 0.195. The mass ratios ofcalcium alginate and Zn 3 P 2 technical (CA/Zn 3 P 2 ) had signi¯cant impacts to drug loading ca-pacity and slow-controlled release performances of Zn 3 P 2 /CA. The palatability and e±cacy ofZn 3 P 2 /CA were signi¯cantly improved and enhanced compared with Zn 3 P 2 technical. The resultsshowed that Zn 3 P 2 /CA presented high loading e±ciency, commendable sustained-release per-formance and good environmental compatibility, and this delivery carrier may be extended toother slow-controlled release and high-e±cient pesticide formulation in future.

PSC‑PWM modulated MPC for cascaded H‑bridge power supplies

Bichen Yan,Haihong Huang,Haixin Wang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.5

In the high-power applications of cascaded H-bridge (CHB) converters, when considering the limitations of the switchingcharacteristics of the power device, the phase-shifted carrier’s pulse width modulation (PSC-PWM) is used to increase theequivalent switching frequency to improve the output quality. However, interleaved carriers make the CHB output characteristics change. Thus, the optimal performance of the traditional fixed switching frequency model predictive control (MPC) using synchronous carrier modulation is no longer applicable. Moreover, it is difficult for the traditional state-space predictive model to quickly eliminate the prediction error caused by a model mismatch in the transient response process. Therefore, parameter mismatch under high uncertainties leads to a significant decrease in the transient optimization performance. In this study, a PSC-PWM modulated MPC is proposed to replace the fixed switching frequency with PSC-PWM and to suppress the parameter mismatching in the predictive model by an adaptive observer. The CHB output voltage is regarded as a whole based on the voltage-second balanced rule within an equivalent switching period to use the adaptive observer. The CHB optimal vector duration calculated by the optimization strategy at each sampling time is implemented by the PSCPWM within an associated H-bridge carrier period. Excellent dynamic and transient performances of the reference tracking can be obtained by the proposed method at similar carrier frequencies. Finally, the tracking performances are verified by experiments conducted on a 5L-CHB.

Robust phase‑shifted model predictive control for cascaded H‑bridge power supplies using linear matrix inequality

Bichen Yan,Haihong Huang,Haixin Wang 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.9

In cascaded H-bridge (CHB) converters, each of the H-bridge carriers of the traditional modulated model predictive control (MPC) is synchronized. Therefore, the steady-state and transient performances are weak in high power applications that exhibit a low switching frequency. The traditional observer-based MPC uses estimation strategies to replace the prediction model under parametric uncertainties. However, there is no effective approach for the uncertainties in the open-loop optimal control law, which leads to a marked decrease in control performance in the presence of high uncertainties. For high power CHB converters, a robust closed-loop MPC using a linear matrix inequality is designed in this study to achieve robust current tracking. The augmented state is asymptotically decreased by the state feedback control law in the terminal elliptical invariant sets. Thus, the worst performance of the model mismatch is minimized. This study also proposes a phase-shifted modulated MPC to improve both the steady-state and transient performances. The voltage of the CHB converter is considered as a whole to implement the proposed method. The optimal duty cycle of each H-bridge, based on the piecewise strategy and voltage-second balanced rule, is implemented by a phase-shifted modulator. Better control performance with shorter response delays, faster tracking speed, and lower overshoot are achieved with a similar switching frequency. The effectiveness of the proposed method is verified by experimental results.

Master–slave modulated model predictive control to optimize current tracking for parallel cascaded H‑bridge power supplies

Bichen Yan,Haihong Huang,Haixin Wang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.1

Conventional distributed control has achieved a great deal of success in multi-parallel cascaded H-bridge (CHB) power supplies. However, conventional distributed controllers can have a seriously imbalanced output power due to a mismatch of the hardware or control parameters and form an unstable circulating current path between the CHB converters, which can lead to a couple of problems. (1) The stability and tracking performance of the branch current can become degraded. (2) The current-sharing reactor can be easily saturated. To optimize all the branch currents of multiple parallel CHB power supplies, a master–slave carrier-based model predictive control method is proposed in this paper. This control strategy can achieve an optimized current tracking performance and effective circulating current suppression. In addition, through carriers, H-bridge interleaving and branch synchronization can be easily achieved, which fixes the switching frequency. Thus, the advantages of model predictive control and interleaving can be combined. Based on the generalized branch current predictive model derived in this paper, when more than two paralleled CHB converters have different output powers, an optimized branch current response can be achieved and circulating current can be eliminated. Simulation and experimental results verify the effectiveness of the proposed method.

Sulfur fate during bituminous coal combustion in an oxy-fired circulating fluidized bed combustor

Lunbo Duan,Wu Zhou,Haixin Li,Xiaoping Chen,Changsui Zhao 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.9

To clarify the sulfur transformation behavior during oxy-fired circulating fluidized bed (CFB) combustion,experiments on SO_2 emission characteristics were carried out in a 50 kWth CFB combustor. Results show that SO_2 emission is quite dependent on the bed temperature in different atmospheres without limestone injection. With Ca/S=2.5, SO_2 emission in 21%O_2/79%CO_2 atmosphere is smaller than that in air atmosphere, but SO_2 emission decreases with the increase of O_2 concentration. The calcium forms in the ash prove the combination of calcination/carbonation and direct sulfation mechanism of limestone under oxy-combustion conditions. And the desulfurization efficiency of limestone (as deducting the self-retention efficiency from the total sulfur removal efficiency) increases from 40% to 52% as the O_2 concentration increases from 21% to 40%.

Mitochondrial-Targeted Polyethylenimine Functionalized Graphene Oxide Nanocarrier and Its Anti-Tumor Effect on Human Lung Carcinoma Cells

Mei Jin,Zhiming Liu,Wen Zhang,Haixin Dong,Fang Zhou,Jianfeng Yu,Xinpeng Wang,Zhouyi Guo 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.8

Graphene oxide nanosheet (NGO) was covalently functionalized with positively charged, branched polyethylenimine (bPEI) via an amide bond, coated with serum proteins by electrostatic interaction. Operating as a newly fashioned, multifunctional nanocarrier, the processed NGO showed promise for use in combined gene therapy, chemotherapy, photothermal therapy, bioimaging and as a biosensor of cancer cells. Our current research is focused on the systematic studies of mechanisms of cancer cellular uptake, subcellular location, cytotoxicity and the cellular exclusion of the NGO–bPEI nanocarriers. It was observed that NGO–bPEI accumulated in the mitochondria and that long-term retention of NGO–bPEI led to a decrease in mitochondrial membrane potential while levels of reactive oxygen species increased. The mitochondrial effects associated with long-term retention of NGO–bPEI have potential as a synergistic enhancer of the cytotoxic effects of anti-cancer drugs or genes in human lung carcinoma (A549) cells. This work demonstrated the utility of NGO–bPEI-based multifunctional nanocarriers while detailing the mechanism at the cellular level and providing guidance for further research in cancer therapy.