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Search Results: 1 - 10 of 86166 matches for " Yu Sun "
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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.
Area-Correlated Spectral Unmixing Based on Bayesian Nonnegative Matrix Factorization  [PDF]
Xiawei Chen, Jing Yu, Weidong Sun
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.31B009
Abstract: To solve the problem of the spatial correlation for adjacent areas in traditional spectral unmixing methods, we propose an area-correlated spectral unmixing method based on Bayesian nonnegative matrix factorization. In the proposed me-thod, the spatial correlation property between two adjacent areas is expressed by a priori probability density function, and the endmembers extracted from one of the adjacent areas are used to estimate the priori probability density func-tions of the endmembers in the current area, which works as a type of constraint in the iterative spectral unmixing process. Experimental results demonstrate the effectivity and efficiency of the proposed method both for synthetic and real hyperspectral images, and it can provide a useful tool for spatial correlation and comparation analysis between ad-jacent or similar areas.
A Simulation Study on Channel Estimation for Cooperative Communication System in Sand-dust Storm Environment  [PDF]
Xuehong Sun, Yu Cao, Jin Che
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2004
Abstract: There are many factors that influence the propagation of electromagnetic wave in the sand-dust storm environment, the scattering effect of dust particle is one of the major factors, so this paper focuses on the dust particles scattering function. The scattering of dust particles inevitably brings the multipath transmission of the signal, multipath propagation will bring the multipath fading of the signal. In this paper, we first investigate the use of AF and DF modes in a sand-dust storm environment. Secondly, we present a low-order modulation method should be used in cooperative communication system. Lastly, we evaluate the system performance for both of the moving nodes and power allocation. Experimental results validate the conclusion of theoretical derivation: the multipath fading is one of the main factors that affect the quality of signal transmission. Cooperative communication technology has good anti-fading ability, which can guarantee the signal transmission timely and correctly.
Possible Influence of Arctic Oscillation on Winter Visibility over Eastern China  [PDF]
Yu Gu, Xiaomeng Shi, Jilin Sun
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.58006
Abstract: NCEP/NCAR reanalysis data, the Arctic Oscillation (AO) index and the atmospheric visibility (Vis) data at 134 sites in eastern China (ECN) are used to investigate the possible influence of AO on the wintertime weather and Vis over ECN. A higher relative humidity (RH, compared with the normal year) is identified over ECN in the winters with a positive phase of AO, and the wind anomaly is generally inshore in the coast areas of China. All these processes are consistent with Vis degradation over ECN. On the contrary, in the winters with a negative phase of AO, a lower RH can be identified over ECN, and the wind anomaly is generally offshore, which is favorable for Vis improvement.
Effects of Curcumin on the Expression of Flotillin-1 in the Brains of APP/PS1 Double Transgenic Mice  [PDF]
Li Tang, Jieyun Sun, Yu Li
Journal of Biosciences and Medicines (JBM) , 2019, DOI: 10.4236/jbm.2019.75004
Alzheimer’s Disease (AD) is a chronic and progressive neurodegenerative disease. Flotillin-1 is a marker protein of lipid raft in nervous tissue, which is significantly increased in AD. To investigate the changes of flotillin-1 expression in the brains of APP/PS1 double transgenic mice treated with curcumin, thirty six-month-old APP/PS1 double transgenic mice were randomly divided into model group (MOD), low-dose curcumin group (LCUR) and high-dose curcumin group (HCUR). LCUR group mice and HCUR group mice were fed with curcumin (0.16 g.kg-1 and 1.0 g.kg-1, respectively) every day for 6 months. Western blot and real-time PCR were used to detect the expression of flotillin-1 in brain. Results showed that compared with MOD group, the expression of flotillin-1 protein (P < 0.05) and mRNA (P < 0.01) in brains of HCUR group were statistically decreased. Thus, high-dose curcumin may play a neuroprotective role in AD through downregulating the expression of flotillin-1 in APP/PS1 double transgenic mice.
Identification of N-Methyl Bis(2-(Alkyloxy-Alkylphosphoryloxy)Ethyl) Amines by LC-HRMS/MS  [PDF]
Huilan Yu, Shilei Liu, Daoming Sun, Chengxin Pei, Yu Xiang
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.513091
Abstract: N-Methyl bis(2-(alkyloxy-alkylphosphoryloxy)ethyl)amines, which are abbreviated as PNPs, are a series of new skeleton chemicals belonging to schedule 2.B.04 chemicals of Chemical Weapons Convention (CWC). PNPs are important markers of chemical warfare agents because they are structurally relative to both nerve agents and N-mustards. In this study, fragmentation pathways of the most characteristic fragment ions in Q-TOF mass spectrometry were proposed based on the information from accurate mass and secondary fragmentations of product ions scan experiments. Results indicated that the base ion in LC/HRMS was the quasi-molecular ion [M+H]+. In LC-HRMS/MS, it was [M+H-CnH2n+1P(O)(OH)CmH2m+1O]+ fragment ion which was formed by losing an alkyloxy alkylphosphoryloxy group from the quasi-molecular ion. The diagnostic ion m/z84.0814 was identified as [C5H10N]+, which was the group of (CH2=CH)2N+(H)CH3. PNPs have two protonated centers. One is on the N atom, the other is on the O atom (P=O). O-n-propyl PNPs generally exhibited two fragmentation pathways. Firstly, the quasi-molecular ion [M+H]+ lost a propoxy alkylphosphoryloxy group to produce
Reducing problem of multiplication operators on Bergman space
Dahai Yu,Shunhua Sun
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882530
Volatile Phenolic Derivatives and its Role in Chinese Traditional Smoke-cured Meat
Ainong Yu,Baoguo Sun
Journal of Food Technology , 2013,
Abstract: Chinese traditional smoke-cured meat (bacon, beef, mutton and chicken) was analysed with regard to its content of volatile phenolic derivatives. Volatile phenolic derivatives were trapped by adsorbing, condensing, and dissolving in organic solvent (ether and n-pentane), using the Nitrogen Purge-and-Trap (NPT) and the Nitrogen Purge-and-Steam Distillation (NPSD) method. Qualitative and quantitative characterizations of the extract were performed by means of gas chromatography-mass spectrometry and gas chromatography with a flame ionization detector, respectively. In all, 24 volatile phenolic derivatives were detected in Chinese traditional smoke-cured meat. Among all detected volatile phenolic derivatives, 12 phenol and alkylphenols, 10 methoxyphenols and 2 other phenols were detected. Phenols originated mainly from the pyrolysis of lignin when the meat was smoked. 4 phenols was new volatile phenolic derivatives in smoked food. These compounds included 5-methylguaiacol, 5-propenylguaiacol, phenol acetate and 2,6-di-tert-butyl-4-(N,N-dimethylaminomethyl)phenol. Volatile phenolic derivatives may be important not only for the odor of Chinese traditional smoke-cured meat, but also for the preservation of the smoke-cured meat and for color development.
Voice Blog: An Exploratory Study of Language Learning
Yu-Chih Sun
Language Learning and Technology , 2009,
Abstract: This study uses voice blogs as a platform for an extensive study of language learners’ speaking skills. To triangulate the findings, the study collected data by surveying the learners’ blogging processes, investigating learning strategies, and conducting retrospective interviews. The results revealed that students (a) developed a series of blogging stages, including conceptualizing, brainstorming, articulation, monitoring, and evaluating, and used a wide variety of strategies to cope with blogging-related difficulties, and (b) perceived blogging as a means of learning, self-presentation, information exchange, and social networking. Findings suggest that blogs can constitute a dynamic forum that fosters extensive practice, learning motivation, authorship, and development of learning strategies.
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