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Search Results: 1 - 10 of 104202 matches for " ChunLing Zhang "
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A QoE Assessment System in Distance Education  [PDF]
Dengyin Zhang, Yangyang Xu, Chunling Cheng
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.31011
Abstract: It is a challenging task to improve the real-time property and objectivity of the effect assessment for the distance education. This paper presents a QoE (Quality of Experience) assessment system based on the attention of online user. The system captures the video frames from two cameras periodically and synchronously, using the adaptive image binarization based on the linear average threshold for the pretreatment, then processing with edge detection and filtering in the cross-directions at the same time. System gets the position of computer screen and user eyeball. Analyzing the detection results comprehensively obtains the attention of online user by some judging conditions, and finally acquires the quality of user experience. Experimental results demonstrate the feasibility and efficiency.
The output feedback control for uncertain nonholonomic systems

Qiangde WANG,Chunling WEI,Siying ZHANG,

控制理论与应用 , 2006,
Abstract: This paper considers the problems of almost asymptotic stabilization and global asymptotic regulation (GAR) by output feedback for a class of uncertain nonholonomic systems. By combining the nonsmooth change of coordinates and output feedback domination design together, we construct a simple linear time-varying output feedback controller, which can universally stabilize a whole family of uncertain nonholonomic systems. The simulation demonstrates the effectiveness of the proposed controller.
A Spatial Database Index Method Based on Doubletree Structure
Dengyin Zhang,Hao Wu,Chunling Chen
Information Technology Journal , 2013,
Abstract: This study puts forward a new algorithm with double R-tree (DR-tree) in order to solve the issues caused by tremendous data size, namely, deepening depth of R-tree, increasingly large occupied space and low query efficiency. This study gives out the data structure, as well as the algorithm of insert, index and delete. According to the experiments, DR-tree will supply higher efficiency at the expense of slightly more occupied space. Moreover, the more the index objectives, the better retrieval performance can be delivered.
Evolution Modeling of Complex Network Dynamics
Fangfeng Zhang,Jun Liu,Chunling Zuo
Journal of Networks , 2012, DOI: 10.4304/jnw.7.3.554-561
Abstract: A class of models is examined whose primary goal is to explain network properties, especially model system with spatial information like human brain, and methods for modeling spatial system tend to get inconsistent results. With the assumption that probability of having edge depended on distance between nodes, to obtain some interesting results: the statistical properties of complex network has no difference between determined and stochastic algorithm, And get networks with a hierarchical structure.
Cast bulk glassy alloys: fabrication, alloy development and properties
Qingsheng Zhang,Chunling Qin,Akihisa Inoue
China Foundry , 2010,
Abstract: Metallic glasses represent an interesting group of materials as they possess outstanding physical, chemical and mechanical properties compared to their crystalline counterparts. Currently, with well designed compositions it is possible to cast liquid alloys into the glassy state at low critical cooling rates from 100 K s-1 to 1 K s-1 and in large critical sample sizes up to several centimeters, which significantly enhances the promise for possible applications as advanced engineering materials. This paper reviews the development of (ZrCu)-based bulk metallic glasses with large sizes by copper mold casting and their unique properties. Additionally, the ex-situ and in-situ second phases reinforced BMG composites with large plasticity are also presented.
Impact of Soft-Input on the Cost of Resources and Environment in Economic Growth  [PDF]
Chunling Pan, Jie Lü
Chinese Studies (ChnStd) , 2012, DOI: 10.4236/chnstd.2012.13004
Abstract: China’s rapid economic growth has proceeded at considerable cost of resources and environment. To find out how to reduce the cost while maintaining economic growth, we took panel data of 28 provinces from 2000 to 2009 as our samples and conducted comparative analysis on the said cost among 28 provinces. From the perspective of soft-input, we subsequently examined soft-input’s influence on the cost of re- sources and environment of in economic growth (CREIEG). Results show that: government spending on scientific research and environmental protections has a significant role in reducing energy consumption and wastewater discharge, but it has limited impact on gas emissions and solid waste emissions reduction. Moreover, financial development also has a positive role in reducing energy consumption. Finally, we propose a number of initiatives to reduce the cost of resources and environment of economic growth based on the analysis results.
The Development of China’s Service Trade in Recent Years  [PDF]
Chunling Pan, Jie Lv
Journal of Service Science and Management (JSSM) , 2013, DOI: 10.4236/jssm.2013.62020
Abstract:

Services trade is an important component of international trade. Its importance is drawing growing academic and government attention. This paper analyzes the current development of China’s service trade. For the transport and tourism are two of the more important services sector, this paper gives more detailed attention. Meanwhile, this paper analyzes the some problems faced by the development of China’s service trade.

Interaction between Soil Moisture and Air Temperature in the Mississippi River Basin  [PDF]
Chunling Tang, Dong Chen
Journal of Water Resource and Protection (JWARP) , 2017, DOI: 10.4236/jwarp.2017.910073
Abstract: Increasing air temperatures are expected to continue in the future. The relation between soil moisture and near surface air temperature is significant for climate change and climate extremes. Evaluation of the relations between soil moisture and temperature was performed by developing a quantile regression model, a wavelet coherency model, and a Mann-Kendall correlation model from 1950 to 2010 in the Mississippi River Basin. The results indicate that first, anomaly air temperature is negatively correlated to anomaly soil moisture in the upper and lower basin, and however, the correlation between them are mixed in the middle basin. The correlation is stronger at the higher quantile (90th) of the two variables. Second, anomaly soil moisture and air temperature show strong coherency in annual frequency, indicating that the two variables are interannually correlated. Third, annual air temperature is significant negatively related to soil moisture, indicating that dry (wet) soil leads to warm (cool) weather in the basin. These results have potential application to future climate change research and water resource management. Also, the strong relationship between soil moisture and air temperature at annual scale could result in improved temperature predictability.
Up-regulation and clinical relevance of novel helicase homologue DHX32 in colorectal cancer
Chunling Huang, Xianming Liang, Ruxin Huang, Zhongying Zhang
Journal of Experimental & Clinical Cancer Research , 2009, DOI: 10.1186/1756-9966-28-11
Abstract: Fluorescent mRNA differential display PCR (DD-PCR) was used to screen the genes differentially expressed in colorectal cancer tissues and their adjacent tissues. The differentially expressed genes were confirmed by real-time PCR and then their clinical relevance (such as association with tumor location and lymph gland metastasis) was further investigated.We identified by DD-PCR a novel RNA helicase, DHX32, which showed higher expression in colorectal cancer tissues than their adjacent tissues, and this result was confirmed by real time RT-PCR. In addition, we found that the level of DHX32 gene expression in colorectal cancer was significantly associated with cancer location, lymph gland metastasis, cancer nodal status, differentiation grade, and Dukes, stage.DHX32 may play an important role in the development of colorectal cancer and could serve as a novel biomarker for colorectal cancer after additional investigation.Colorectal cancer (CRC) is one of the most common causes of cancer death throughout the world. Multistage development of the disease has been associated with remarkable genetic events, mainly at the level of oncogenes and oncosuppressor genes, most notably the adenomatous polyposis coli gene (APC) [1], ras [2,3], and p53 [4]. Although great advances have been made during the last few decades in understanding the molecular biology of colorectal cancer [5], the prognosis of patients with this neoplasm has not improved in parallel. The overall five-year survival rate remains poor (40–45%) [6]. It can be assumed that several genes involved in the pathogenesis of colorectal cancer are still unknown. Therefore, further elucidation of the molecular biology of colorectal cancer may be useful to devise new methods for the diagnosis and the treatment of the disease.Several approaches have been taken to identify and compare gene expression in normal and disease states [7-11]. The differential display technique was employed in this study based on its ability to id
A meta-analysis of oxidative stress markers in schizophrenia
Ming Zhang,ZhongMing Zhao,Lin He,ChunLing Wan
Science China Life Sciences , 2010, DOI: 10.1007/s11427-010-0013-8
Abstract: Oxidative stress has been identified as a possible element in the neuropathological processes of schizophrenia (SCZ). Alteration of oxidative stress markers has been reported in SCZ studies, but with inconsistent results. To evaluate the risk of oxidative stress to schizophrenia, a meta analysis was conducted, including five markers of oxidative stress [thiobarbituric reactive substances (TBARS), nitric oxide (NO), catalase (CAT), glutathione peroxidase (GP) and superoxide dismutase (SOD)] in SCZ patients versus healthy controls. This study showed that TBARS and NO significantly increased in SCZ, while SOD activity significantly decreased in the disorganized type of SCZ patients. No significant effect size was found for the activities of GP and CAT in SCZ patients (P>0.05). Egger’s regression test observed no significant publication bias across the oxidative stress markers, but found high heterogeneities in all the 5 markers. The subgroup analysis suggested that the ethnicity, sample size of patients and sample sources may contribute to the heterogeneity of the results for TBARS, NO and SOD. The result further demonstrated the involvement of oxidative stress in the pathophysiology of schizophrenia.
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