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Search Results: 1 - 10 of 70615 matches for " YU Xing "
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Pricing European Call Currency Option Based on Fuzzy Estimators  [PDF]
Xing Yu, Hongguo Sun, Guohua Chen
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.24058
Abstract: In this paper we present an application of fuzzy estimators method to price European call currency option. We make use of fuzzy estimators for the volatility of exchange rate which based on statistical data to obtain the fuzzy pattern of G-K model. A numerical example is presented to get the -level closed intervals of the European call currency option fuzzy price.
The Optimal Portfolio Model Based on Mean-CVaR  [PDF]
Xing Yu, Hongguo Sun, Guohua Chen
Journal of Mathematical Finance (JMF) , 2011, DOI: 10.4236/jmf.2011.13017
Abstract: This paper proposed the optimal portfolio model maximizing returns and minimizing the risk expressed as CvaR under the assumption that the portfolio yield subject to heavy tail. We use fuzzy mathematics method to solve the multi-objectives model, and compare the model results to the case under the normal distribution yield assumption based on the portfolio VAR through empirical research. It is showed that our return is approximate to M-V model but risk is higher than M-V model. So it is illustrated that CVaR predicts the potential risk of the portfolio, which will help investors to cautious investment.
On the Relationship between Equality and Efficiency
Pei-xing YU
Management Science and Engineering , 2009,
Abstract: The established theory of equality and efficiency implies that the two are in an unconditional negative correlation. According to this hypothesis and by setting up a simple model, the paper aims to prove the following propositions: Even if not considering the inequality of opportunity, only unequal results will have a double-edged effect on efficiency, either positive or negative. However, the final results attained from the positive and negative functions are not always favorable for efficiency. Only when stimulating effects surpass the undermining ones, can we raise efficiency through increasing inequality index or sacrificing certain equality. Therefore, under some circumstances, the tradeoff between equality and efficiency does not exist. Key words: equality; efficiency; inequality index; the relational curve between equality and efficiency
A Research of Regional Difference in R&D Activities in GUANGDONG, PR China
Hongguo SUN,Xing YU
Progress in Applied Mathematics , 2012, DOI: 10.3968/2230
Abstract: According to the 2008 economic census yearbook in Guangdong, it explores the reasons why the development of R&D is different in different area. According to the data, it analyses the R&D activity using factor analysis and clustering analysis, the results show that R&D activity level is directly associated with the foundation and the total quantity of R&D activities, the use efficiency of R&D expenditure as well as the output ability of R&D staff. Based on the results, the countermeasures are given. Key words: R&D activity; Regional difference; Factor analysis; Clustering analysis
Phase Drifts of Sub-pulses during the 2004 Giant Flare of SGR 1806-20 and Settling of the Magnetic Fields
Yi Xing,Wenfei Yu
Physics , 2010, DOI: 10.1088/0004-637X/729/1/1
Abstract: We analyzed the observations of SGR 1806-20 performed with the \textit{Rossi X-ray Timing Explorer} (RXTE) during its 2004 giant flare. We studied the phase evolution of the sub-pulses identified in the X-ray waveform and found that the sub-pulses varied in phase with time and then gradually settled, which might indicate drifts of the emission regions in relative to the neutron star surface, or changes in the local emission geometry before the magnetic field became stable. The characteristic e-folding timescale of the phase drifts measured starting about 15 s following the initial flux spike are in the range between 37 s and 84 s. This leads to the first measurements of the characteristic timescale for the magnetic field of the neutron star to settle after a field reconfiguration during the giant flare.
A Novel Over-Current Protection Technique Applied to Peak-Current Type DC-DC Converter  [PDF]
Yu Fang, Tengfei Wei, Liang He, Yong Xie, Yan Xing
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.26045
Abstract: The change of the over-current protection point of the power switches, caused by slope compensation, is analyzed in detail. It is discovered that the peak current protecting value increases as the duty cycle decreases. As a result, the safety operation of the switches is damaged greatly. A novel solution to improve over-current protection with constant peak current limitation is proposed by inducing synchronous slope compensation into the current limit function instead of the original constant voltage. The design principle and method of the protection circuit based on a UC3846 PWM controller for the interleaved dual-forward converter is presented. Experimental results are given to verify the analysis.
Contemporary therapy of atrial fibrillation  [PDF]
Xing Sheng Yang, Jing Ping Sun, Cheuk Man Yu
World Journal of Cardiovascular Diseases (WJCD) , 2012, DOI: 10.4236/wjcd.2012.23018
Abstract: Atrial fibrillation (AF) is estimated that by 2010, approximately 2.6 million people will be affected in USA; by 2050, that number may increase to 10 million patients. Generally, rate control alone is reasonable in some AF patients, especially asymptomatic patients. Restoration and maintenance of sinus rhythm (SR) may be achieved by means of cardioversion, drugs or/ and catheter ablation. Pharmacological therapy can be useful to maintain SR and prevent tachycardia-induced cardiomyopathy. All patients with AF regardless of whether a rhythm or rate control strategy recommend anticoagulant, antiplatelet or both combined therapy for prevention of thromboembolism, except those with lone AF or contraindications. Drug selection should be based upon the absolute risk of stroke, bleeding, the relative risk and benefit for a given patient. Biventricular pacing may overcome many of the adverse hemodynamic effects associated with RV pacing alone. A target individual ectopic foci ablation within the pulmonary vein (PV) has evolved to circumferential electrical isolation of the entire PV musculature. Cavotricuspid isthmus should be considered as first-line therapy for patients with typical atrial flutter. Completely non-fluoroscopic ablation guided by Real-Time Magnetic Resonance Imaging (RTMRI) using a steerable and non-ferromagnetic catheter is a promising novel technology in interventional electrophysiology.
Survey of Stereotactic Body Radiation Oncology for Early Staged Non-Small Cell Lung Cancer in China  [PDF]
Ligang Xing, Yong Yin, Spring Kong, Jinming Yu
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2014, DOI: 10.4236/ijmpcero.2014.31009
Abstract:

Purpose: To evaluate the current status of stereotactic body radiotherapy (SBRT) for early staged non-small cell lung cancer (NSCLC) at main cancer hospitals in China. Methods and Materials: The questionnaire was sent by mail and email to 21 hospitals, which include the patient enrollment, treatment technique, dose and fractionation, quality control, disease control and side effects. Results: Nineteen hospitals responded. It was found that SBRT has been used for early staged NSCLC in most of the hospitals participating in the survey. The patient characteristics and techniques were relatively consistent, but there were many controversies regarding dose fractionation and quality control. Conclusions: SBRT for early staged NSCLC has been applied at main cancer hospitals in China. However, considerable variation exists. The establishment of clinical guidelines and standardized quality control are crucial for further improvement.

COMPARISON OF VOLATILE COMPONENTS FROM MARCHANTIA CONVOLUTA OBTAINED BY MICROWAVE EXTRACTION AND PHYTOSOL EXTRACTION
YAN,CHEN; XING YU,JIANG; XING,TONG; XIAO QING,CHEN;
Journal of the Chilean Chemical Society , 2008, DOI: 10.4067/S0717-97072008000200016
Abstract: the volatile oils from marchantía convoluta were obtained by microwave extraction (me) and phytosol extraction (pe) methods. the attained extracts were analyzed by gas chromatography with mass spectrometric detector (gc-ms). the compounds were identified according to their retention indices and mass spectra (el, 70 ev). a total of fourteen compounds were identified in me extract accounting for 80.72% of total peak area. isolongifolene (24.588%), 1, 2-benzenedicarboxylic acid, butyl cyclohexyl ester (10.768%), pyrene (9.328%) and hexadecanoic acid, ethyl ester (8.570%) were the major compounds identified from me extract. the analytical results of me extract were compared with pe method. the me extract was found to be markedly different from that of pe extract. a total of seven compounds in pe extract were identified accounting for 74.275% total peak area. 1-phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10, 10a-octahydro-1, 4a-dimethyl-7-(1-methylethyl) methyl ester were the major compounds
COMPARISON OF VOLATILE COMPONENTS FROM MARCHANTIA CONVOLUTA OBTAINED BY MICROWAVE EXTRACTION AND PHYTOSOL EXTRACTION
CHEN YAN,JIANG XING YU,TONG XING,CHEN XIAO QING
Journal of the Chilean Chemical Society , 2008,
Abstract: The volatile oils from Marchantía convoluta were obtained by microwave extraction (ME) and phytosol extraction (PE) methods. The attained extracts were analyzed by gas chromatography with mass spectrometric detector (GC-MS). The compounds were identified according to their retention indices and mass spectra (El, 70 eV). A total of fourteen compounds were identified in ME extract accounting for 80.72% of total peak area. Isolongifolene (24.588%), 1, 2-benzenedicarboxylic acid, butyl cyclohexyl ester (10.768%), pyrene (9.328%) and hexadecanoic acid, ethyl ester (8.570%) were the major compounds identified from ME extract. The analytical results of ME extract were compared with PE method. The ME extract was found to be markedly different from that of PE extract. A total of seven compounds in PE extract were identified accounting for 74.275% total peak area. 1-Phenanthrenecarboxylic acid, 1,2,3,4,4a,9,10, 10a-octahydro-1, 4a-dimethyl-7-(1-methylethyl) methyl ester were the major compounds
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