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Search Results: 1 - 10 of 42621 matches for " Zhongmin Xu "
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An Integrated Modelling Approach Inmountainous Watershed of Heihe River Basin, Northwest China  [PDF]
Youjia Liang, Lijun Liu, Zhongmin Xu
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.53010
Abstract:

An integrated modelling approach is developed to simulate ecological economics processes of mountainous watershed of Heihe river basin, northwest China. The objectives are 1) a hydrologic unit model HLM_HMU was developed; 2) the impacts of LUCC on the hydrological processes based on different scenarios were simulated respectively; and 3) the Payment for Ecosystem Services (PES) curve of prohibition grazing is given. The hydrological results show that the observed and simulated data have a good fit, in which the Nash–Sutcliffe efficiency, balance error, and explained variance are 0.69, -0.13, and 0.62, respectively; the model can simulate the majority of peaks well; the source code of Spatial Modelling Environment (SME) needs to be deeply understood to improve the algorithms of interpolation and conflux; the PES result shows that prohibition grazing will occur completely when the price of PES reached to 17.42 yuan, and the increased amount of ecosystem services is 2.13 × 108 m3.The main purpose of this paper is to build a better understanding of developing a meaningful integrated model in the study area to solve its ecological and economic problems.

Skorohod Equation and Reflected Backward Stochastic Differential Equations
Zhongmin Qian,Mingyu Xu
Mathematics , 2011,
Abstract: By using the Skorohod equation we derive an iteration procedure which allows us to solve a class of reflected backward stochastic differential equations with non-linear resistance induced by the reflected local time. In particular, we present a new method to study the reflected BSDE proposed first by El Karoui et al. \cite{MR1434123}.
An integrated analysis approach to LUCC at regional scale: A case study in the Ganzhou District of Zhangye City, China

YouJia Liang,ZhongMin Xu,

寒旱区科学 , 2012,
Abstract:
The role of social resource of indigenous people in local ecological resource management in China: A preliminary case in Zhangye, Northwestern China

YuWen Li,ZhongMin Xu,HuaiWen Cheng,

寒旱区科学 , 2009,
Abstract: Social resources of indigenous people are valuable wealth, including the social norms, the relational network, belief, attitude as well as the social system which is accumulated from generation to generation. Those social resources are very important for local ecological resource management, which can help diffuseness and communion of skills and traditional conservation techniques for conserving and restoring the ecological sites. Social capital is one indicator of social resources, which is accepted widely. In order to investigate the role of social resources of indigenous people in local ecological resource management, the authors studied the relation between social capital of indigenous people and local ecological resource management, taking Zhangye City as an example. In this paper, social capital of indigenous people is quantified by constructing social capital index, composed of structural social capital and cognitive social capital; local ecological resource management is quantified by constructing "Grain for Green Project" performance index. Based on correlation analysis approach and logistic regression analysis approach, the authors analyzed the relation between social capital and "Grain for Green Project" performance index, as well as the relations between "Grain for Green Project" performance index and other factors such as per capita net income, medical treatment and so on. Results showed that the correlation between social capital and "Grain for Green Project" performance index was positive, the coefficient was 0.761, with P<0.01. An increase of 1 unit in social capital is associated with an increase of 1.550 units in "Grain for Green Project" performance. With factor, such as faction, per capita net income, medical treatment, increasing 1 unit, the "Grain for Green Project" performance index will increase 3.912, 1.039 and 1.005 units, respectively
Re-scale AdaBoost for Attack Detection in Collaborative Filtering Recommender Systems
Zhihai Yang,Lin Xu,Zhongmin Cai
Computer Science , 2015,
Abstract: Collaborative filtering recommender systems (CFRSs) are the key components of successful e-commerce systems. Actually, CFRSs are highly vulnerable to attacks since its openness. However, since attack size is far smaller than that of genuine users, conventional supervised learning based detection methods could be too "dull" to handle such imbalanced classification. In this paper, we improve detection performance from following two aspects. First, we extract well-designed features from user profiles based on the statistical properties of the diverse attack models, making hard classification task becomes easier to perform. Then, refer to the general idea of re-scale Boosting (RBoosting) and AdaBoost, we apply a variant of AdaBoost, called the re-scale AdaBoost (RAdaBoost) as our detection method based on extracted features. RAdaBoost is comparable to the optimal Boosting-type algorithm and can effectively improve the performance in some hard scenarios. Finally, a series of experiments on the MovieLens-100K data set are conducted to demonstrate the outperformance of RAdaBoost comparing with some classical techniques such as SVM, kNN and AdaBoost.
Rural resident household food consumption patterns in the Ganzhou district of Zhangye city: an analysis based on ELES Model
Fang Su,ZhongMin Xu,HaiYang Shang,
Fang Su
,ZhongMin Xu,HaiYang Shang

寒旱区科学 , 2009,
Abstract: Demand for food plays an important role in the adjustment of prices for agricultural products and for adjusting agricultural structure. By?using the extended linear expenditure system (ELES), we analyzed the food consumption structure of rural residents in the Ganzhou district of Zhangye city, and determined the basic food-consumption demand, the marginal propensity of consumption, the income elasticities of demand, and the own-price and cross-price elasticities of local rural residents, all of which illustrate the influencing factors on food consumption of rural residents and for forecasting the food-consumption structure. Those analyses show the following: the rural residents’ expenditure on household basic food consumption reaches about 7,050.35 Yuan; the marginal propensities of consumption of fruits and vegetables are relatively high (0.062 and 0.106, respectively), followed by meat (0.044); the demands for various foods are increasing as income increases, with the largest income elasticity of demand corresponding to fruits (1.354) and the lowest to cereal (0.310); fruits and vegetables have relatively high own-price elasticities (respectively –0.879 and –0.442), with the cereal having the lowest one (–0.184). An increase in cereal prices would greatly affect demand for other products; with the rising size of rural households, the consumption for meat is decreasing whereas it is increasing for cereal. The improvement of household education levels will lead to the increase of fruit consumption (E = 0.297), which indicates that people will pay more attention to diet and nutrition structure with the improvement of education. Further, although the amount of cereal expenditure is continually growing, the share will be declining with the increase of household income in 2006–2012. For all these reasons, therefore, the government should encourage the cultivation of economic crops and guide the development of stockbreeding to ensure the stability of cereal output. In order to attain the balance between supply and demand, it is important to rationally adjust the prices of fruits and vegetables on the basis of the stable price of cereal.
Anchor-Free Localization Method for Mobile Targets in Coal Mine Wireless Sensor Networks
Zhongmin Pei,Zhidong Deng,Shuo Xu,Xiao Xu
Sensors , 2009, DOI: 10.3390/s90402836
Abstract: Severe natural conditions and complex terrain make it difficult to apply precise localization in underground mines. In this paper, an anchor-free localization method for mobile targets is proposed based on non-metric multi-dimensional scaling (Multi-dimensional Scaling: MDS) and rank sequence. Firstly, a coal mine wireless sensor network is constructed in underground mines based on the ZigBee technology. Then a non-metric MDS algorithm is imported to estimate the reference nodes’ location. Finally, an improved sequence-based localization algorithm is presented to complete precise localization for mobile targets. The proposed method is tested through simulations with 100 nodes, outdoor experiments with 15 ZigBee physical nodes, and the experiments in the mine gas explosion laboratory with 12 ZigBee nodes. Experimental results show that our method has better localization accuracy and is more robust in underground mines.
Successful resolution of refractory chronic cough induced by gastroesophageal reflux with treatment of baclofen
Xianghuai Xu, Qiang Chen, Siwei Liang, Hanjing Lü, Zhongmin Qiu
Cough , 2012, DOI: 10.1186/1745-9974-8-8
Abstract: Gastroesophageal reflux induced cough (GERC) is a common cause of chronic cough and accounts for 5-41% of chronic cough. [1] Although proton pump inhibitors are a standard therapy for GERC, some patients do not respond to the antireflux medical treatment and remain a challenge to doctors. Here, we report three patients with GERC resistant to proton pump inhibitors but successfully treated with baclofen.A 26-year-old male patient with persistent cough for 3.5 years was referred to our respiratory clinic. He complained of cough day and night, with small amounts of viscous sputum. The accompanying symptoms included frequent clearing of the throat, occasional heartburn and acid regurgitation, but no post-nasal drip and chest pain (Table 1). The patient acknowledged a medical history of allergic rhinitis for 7 years, denied any exposure to environmental or occupational irritants, and never smoked. One year prior to the visit, he received a full diagnostic work-up in another respiratory clinic, where the results of laboratory investigations showed the normal chest radiographs and lung function, negative bronchial provocation to methacholine, positive IgE specific to dust mite and soybean in the serum, 1.5% of eosinophils in induced sputum, normal findings in fiberobronchoscope, and only submucosal edema with infiltration of scattered eosinophils and lymphocytes into airway mucosa as described by the pathologist examining the biopsy examples. A further 24-hour esophageal pH monitoring revealed an abnormal acid-reflux with a DeMeester score of 61.4 and the symptom association probability of 99%. Then, the presumptive diagnosis of GERC was established and oral omeprazole 20 mg twice a day was commenced. Three months later, his heartburn and acid regurgitation disappeared while the cough did not improve. The patient’s cough persisted despite the subsequent treatment with oral montelukast and inhaled corticosteroid.Physical examination showed no other abnormal findings except
Efficiency, Equity and Effect: a case study on virtual water consumption characteristics

HaiYang Shang,KeGong Chen,ZhongMin Xu,GarlandRenn Sam,

寒旱区科学 , 2009,
Abstract:
The Primary Study on Assessing Social Water Scarcity in China
中国社会化水资源稀缺评价

XU Zhongmin,LONG Aihua,
徐中民
,龙爱华

地理学报 , 2004,
Abstract: Based on some discussions on the relationship between environmental capital and economic development, the social adaptive capacity coined by Ohlsson has been introduced. Combined with the classification of water resource management, the authors discussed the interconnection between the natural resource reconstruction and social adaptive capacity. With a view to overcoming water resource scarcity, increased social resources as an alternative way has been emphasized. At the same time, it allows strategic decision-makers to source some effective strategies from political economy system outside the natural resources themselves. To illustrate the effect of social adaptive capacity, a new social resource water scarcity index (SWSI) is developed based on a combination of traditional hydrological indices and our actual assessment index of social adaptability as most readily available proxy for social adaptive capacity. Calculations are made for 31 provinces, 2002. The study demonstrates that the index captures the social impacts of water scarcity more accurately than earlier indices. Finally, with a general concern that traditional technical and economic options for water resource management are no longer adequate for situations of increasing water scarcity. We pinpoint that there is a need to develop policy options to stimulate adaptive processes and strengthen social resources capacity, and consider and apply alternative multidisciplinary options based on critical social resource factors.
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