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Search Results: 1 - 10 of 103734 matches for " Hong Yu Ren "
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An Integrated Intrusion Detection System by Combining SVM with AdaBoost  [PDF]
Yu Ren
Journal of Software Engineering and Applications (JSEA) , 2014, DOI: 10.4236/jsea.2014.712090
Abstract: In the Internet, computers and network equipments are threatened by malicious intrusion, which seriously affects the security of the network. Intrusion behavior has the characteristics of fast upgrade, strong concealment and randomness, so that traditional methods of intrusion detection system (IDS) are difficult to prevent the attacks effectively. In this paper, an integrated network intrusion detection algorithm by combining support vector machine (SVM) with AdaBoost was presented. The SVM is used to construct base classifiers, and the AdaBoost is used for training these learning modules and generating the final intrusion detection model by iterating to update the weight of samples and detection model, until the number of iterations or the accuracy of detection model achieves target setting. The effectiveness of the proposed IDS is evaluated using DARPA99 datasets. Accuracy, a criterion, is used to evaluate the detection performance of the proposed IDS. Experimental results show that it achieves better performance when compared with two state-of-the-art IDS.
Bis(4-dimethylamino-1-ethylpyridinium) bis(1,2-dicyanoethene-1,2-dithiolato-κ2S,S′)nickelate(II)
Shan-Shan Yu,Hong Zhou,Xiao-Ming Ren
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812008161
Abstract: The asymmetric unit of the title complex, (C9H15N2)2[Ni(C4N2S2)2], comprises one 4-dimethylamino-1-ethylpyridinium cation and one half of a [Ni(mnt)2]2 (mnt2 = maleonitriledithiolate) anion; the complete anion is generated by the application of a centre of inversion. The NiII ion is coordinated by four S atoms of two mnt2 ligands and exhibits a square-planar coordination geometry.
Electrohydromechanical analysis based on conductivity gradient in microchannel

Jiang Hong-Yuan,Ren Yu-Kun,Ao Hong-Rui,Antonio Ramos,

中国物理 B , 2008,
Abstract: Fluid manipulation is very important in lab-on-a-chip system. This paper analyzes phenomena which use the alternating current (AC) electric field to deflect and manipulate coflowing streams of two different electrolytes (with conductivity gradient) within a microfluidic channel. The basic theory of the electrohydrodynamics and simulation of the analytical model are used to explain the phenomena. The velocity induced for different voltages and conductivity gradient are computed. The results show that when the AC electrical signal is applied on the electrodes, the fluid with higher conductivity occupies a larger region of the channel and the interface of the two fluids is deflexed. It will provide some basic references for the people who want to do more study in the control of diffrent fluids with conductivity gradient in microfluidic channel.
Impact of Admission Hyperglycemia on Stroke-Associated Pneumoniain Acute Cerebral Hemorrhage: A Retrospective Observational Study  [PDF]
Tian-Hua Ren, Biao Yuan, Tie-Cheng Yang, Jian-Guo Li, Niu Chi, Qian-Wei Ren, Hong-Mei Shi, Dong-Ming Yu, Kai Shan, Li-Xia Li, Xiao-Yan Dong
Open Journal of Emergency Medicine (OJEM) , 2015, DOI: 10.4236/ojem.2015.31001
Abstract: Background: Hyperglycemia is always seen amongst acute intra-cerebral hemorrhage (ICH) and usually has been reported in literature and studied in relation to mortality and poor recovery. However, literature specific to stroke-associated pneumonia (SAP) on this topic is very small. Further, how to differentiate the predictive value of hyperglycemia with and without abnormal HbA1C in such patients is still a matter of debate and no universal consensus. We evaluated hyperglycemia as a marker for SAP in patients with ICH to assess its usefulness as a potential predictor. Materials and methods: Clinical characteristics for a sample of 551 patients with acute ICH were collected from the Beijing Tiantan Hospital of Capital Medical University, Beijing, China. Possible associated risk factors of SAP were reviewed. Hyperglycemia and HbA1C on admission were the main hypothetic predictor, SAP occurring within the first 7 days is the primary outcome. Results: The cohort study includes 551 hospitalized patients. The prevalence of hyperglycemia was 52.5% and SAP occurred in 147 (26.7%). The incidence of SAP was higher in the group with hyperglycemia than those without hyperglycemia (37.7% versus 14.5%, p < 0.01). Multivariate logistic regression analyses showed the SAP was significantly associated with hyperglycemia (OR, 2.48; 95% CI, 2.37 - 5.72), in the subgroup analysis we found hyperglycemia with normal HgbA1C level (<6.5) had been shown to be significantly associated with increased incidence of SAP (OR, 3.86; 95%CI, 2.98 - 6.72), however, hyperglycemia with high HgbA1C level (>6.5) (OR, 1.57; 95%CI, 0.81 - 3.23) had not been shown to be associated with SAP. Conclusions: In this hospital-based cohort of patients presenting with acute intra-hemorrhage, hyperglycemia on admission was associated significantly with SAP. The association was stronger for hyperglycemia with normal HgbA1C than for hyperglycemia with high HgbA1C. Hyperglycemia with normal HgbA1C might be a more sensitive predictor of early acute complication, such as SAP.
Online upgrading of organic vapors from the fast pyrolysis of biomass
LI Hong-yu,YAN Yong-jie,REN Zheng-wei,
LI Hong-yu
,YAN Yong-jie,REN Zheng-wei

燃料化学学报 , 2008,
Abstract: The online upgrading process that combined the fast pyrolysis of biomass and catalytic cracking of bio-oil was developed to produce a high quality liquid product from the biomass. The installation consisted of a fluidized bed reactor for pyrolysis and a packed bed reactor for upgrading. The proper pyrolysis processing conditions with a temperature of 500℃ and a flow rate of 4m3·h-1 were determined in advance. Under such conditions, the effects of temperature and weight hourly space velocity (WHSV) on both the liquid yields and the oil qualities of the online catalytic cracking process were investigated. The results showed that such a combined process had the superiority of increasing the liquid yield and improving the product quality over the separate processes. Furthermore, when the temperature was 500℃, with a WHSV of 3h-1, the liquid yield reached the maximum and the oxygenic compounds also decreased obviously.
Application of the homotopy analysis method to solving dissipative system

Shi Yu-Ren,Yang Hong-Juan,

物理学报 , 2010,
Abstract: We obtained a class of approximations and analytical solutions for the KdV-Burgers equation by using the homotopy analysis method (HAM). The solutions we got agree very well with the exact solutions. The results indicate that the HAM is still valid for solving a class of dissipative systems.
Crop yield and water supply in North China

YU Jing jie,REN Hong zun,

自然资源学报 , 2001,
Abstract: North China is one of the most important grain production bases of the country and plays an important role in the national food security.The present population,cultivated land and crop production all have exceeded 1/4 of the national total.The crop yield accounts for 22% of the national total crop yield in 1949 and 29.6% of that in 1998.Irrigation serves as an essential guarantee to obtain high stable crop yield in the region because the distribution of water resources is inconsistent with the regional arable land,light and heat. The water resources in North China are characterized by water shortage per capita and per unit arable land as well,uneven distribution in space and in time,and stable ground water resources.The status of water use in North China is quite serious,per capita water use amount is 315 m3 in 1997.Agriculture is the main water consumer,and the water consumption in agriculture is 5 times as much as that in industry.The conflict between water supply and demand in agriculture is becoming more and more severe.While the future water supply for agriculture will be quite unpleasant both in quantity and quality.First,there is no much water supply potential left since the water resources exploitation rate is 98.5%. Second,the agriculture water supply quota is going to decrease in the process of industrialization and urbanization in North China.Third,the water supply guarantee will be lowered resulted from frequent drought and flood,severe water pollution and extensive groundwater level decline.The water supply for agriculture can not meet the water demand to maintain and raise the crop yield in North China if there is no successive high flow years or no new water sources.Therefore,it is urgent to make a set of feasible measures in order to solve the conflict between crop production and water shortage.
Two-Pion Interferometry for the Granular Sources in Ultrarelativistic Heavy Ion Collisions at the RHIC and the LHC

ZHANG Wei-Ning,YIN Hong-Jie,REN Yan-Yu,

中国物理快报 , 2011,
A method of evaluating agricultural water supply & water demand in the north China plain

REN Hong zun,YU Jing jie,LIN Yao ming,

地理研究 , 1999,
Abstract: Contradiction between supply and demand of water resources for agricultural development is becoming more and more serious with economic development, spreading urbanization and population increase. Usually, the evaluation of water supply & water demand focuses on whether there is a balance between water supply and water demand and attempts to get this balance by unceasingly increasing water supply even including water transfer to meet water demand. Such conception is definite wrong because water resources are limited. In fact, the relationship between supply and demand is not merely a problem of water amount, but a systematic project related to society economy, environment, population, resources, science and technique. Therefore, a integrated evaluation model has been accepted to quantitatively analyze the condition of water supply and demand in this paper. First of all, the factors influencing water supply and demand are classified and considered at the first level. Each of the factors is described by using several variables, and these variables are considered at the second level. In this way an indicator system composed of the interrelated factors and variables at different levels will be formed. For each region, the function of each factor or variable can be evaluated by using a criteria system. The function of the factors or variables are weighed by using a marking system in which higher mark for a satisfactory factor or variable, vice versa. The condition of supply and demand can be estimated according to sum of the marks of the variables considered. The evaluation procedure follows: 1 to establish an indicator system for evaluating water supply and demand 2 to analyze and calculate weight for each factor and variable 3 to establish the integrated evaluation model 4 to evaluate the conditions of water supply and demand
Microwire formation based on dielectrophoresis of electroless gold plated polystyrene microspheres

Jiang Hong-Yuan,Ren Yu-Kun,Tao Ye,

中国物理 B , 2011,
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