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Search Results: 1 - 10 of 130682 matches for " Qi Wang "
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Analytical Approach to Differential Equations with Piecewise Continuous Arguments via Modified Piecewise Variational Iteration Method  [PDF]
Qi Wang
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.21005

In the present article, we apply the modified piecewise variational iteration method to obtain the approximate analytical solutions of the differential equations with piecewise continuous arguments. This technique provides a sequence of functions which converges to the exact solution of the problem. Moreover, this method reduces the volume of calculations because it does not need discretization of the variables, linearization or small perturbations. The results seem to show that the method is very reliable and convenient for solving such equations.

An Overview of Functional Components of Artificial Intelligence Financial Decision Support System  [PDF]
Qi Wang
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.68009
Abstract: The development of artificial intelligence technology makes the intelligent decision-making of enterprise finance possible. Combined with the traditional enterprise financial decision support system, this paper summarizes and introduces the structure and function of the enterprise Financial Decision Support System and its subsystems under the development of artificial intelligence in detail.
Research of Intelligent Transportation System Based on the Internet of Things Frame  [PDF]
Yuqi Wang, Hui Qi
Wireless Engineering and Technology (WET) , 2012, DOI: 10.4236/wet.2012.33023
Abstract: According to city public transit problem characteristic, the main body of a paper has been submitted and has worked out one kind of based on the Internet of things frame Intelligent transportation system. That system collects data by vehicle terminal and uploads data to the server through the network and makes data visible to the consumer passing an algorithm in the server. One aspect, the consumer may inquire about public transit vehicle information by Web. On another aspect, the consumer can know public transit vehicle information by station terminal. The experiments have tested that the Intelligent transportation system can offer public transit vehicle information to many consumers with convenient way thereby this system can solve the city mass transit problem.
Erosion and sediment budget of the 2008 Wenchuan earthquake: A case study on Mianyuan River basin  [PDF]
Lijian Qi, ZhaoYin Wang, Xuzhao Wang
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.428084
Abstract: The Wenchuan Earthquake caused a large number of avalanches and landslides at different scales. It is extremely significant to evaluate the sediment in the earthquake river basins. Along the 38 km long upper Mianyuan River 196 landslides and avalanches happened during the earthquake, which have formed 25 landslide dams and quake lakes. The total volume of sediment erosion due to earthquake was about 115 million m3, which is 75 times higher than the soil erosion in normal years. Only a part of the solid material could be transported by the river water flow as suspended load and bed load. The total volume of bed load deposit in the river and the quake lakes was 1.43 million m3. Moreover the quake lakes had also trapped 0.12 million m3 suspended load. Only 0.18 million m3 of fine sediment had been drifted through the quake lakes and transported into the lower reaches of the Mianyuan River. The wide range of size distributions of sediment from earthquake erosion caused the extreme difference in the amounts of sediment erosion and transportation. Most of the sediment from earthquake erosion can be only transported for a short distance by landslides and debris flows. Less than 0.2% of the total volume of sediment from earthquake erosion may be transported into large rivers. Therefore, earthquake erosion has little effect on the sediment transportation and fluvial processes in the large rivers.
Research on Teenagers’ Static Balance Ability Based on Somatosensory Interaction  [PDF]
Qi Zhong, Xiaoyan Wang, Wei Wang
Advances in Applied Sociology (AASoci) , 2019, DOI: 10.4236/aasoci.2019.91002
Abstract: Good balance ability plays an important role in teenagers’ physical development. Establishing a comprehensive evaluation system is conducive to promote the development of teenagers’ balance ability test. In this study, based on the calculation of the center of mass, Kinect detects human body’s joints to obtain 10 basic indicators of the static balance ability, calculate the weight coefficient and the variation coefficient by the variation coefficient method and calculate the coefficient values of different tasks and indexes, finally, combine coefficient linear with weight linear sum method to obtain comprehensive evaluation index formula of static balance ability. From the test items in the text, the weight coefficient of the single foot standing with closing eyes is relatively high (29.23%), which had a greater influence on the final static balance ability assessment. In the test indicators, the weight coefficient of index in the swing speed of center of mass is relatively high (32.9%), and that in swinging of the vertical axis of center of mass is also relatively high (30.0%), taking great impact on the final test result. Finally, there is a comparison between the results of this study and experts’ evaluation result, the correlation coefficient between the two (|r| > 0.85, r < 0, p < 0.01) indicates that the two groups have a high negative correlation, and they match yet the evaluation system is more sensitive if two scores are normalized to the same interval.
Changes of endocrine and immune function in subjects of yang deficiency constitution
Zhong Xi Yi Jie He Xue Bao , 2008,
Abstract: Objective: To investigate the changes of endocrine, cyclic nucleotide and immune systems in subjects of yang deficiency constitution, and to explore the relationship among characteristics and causes of yang deficiency constitution, the physiological and biochemical parameters.Methods: Based on the diagnostic criteria for the clinical epidemiological investigation, sixty subjects of yang deficiency constitution and fifty of normal constitution were selected. Eight milliliters venous blood were taken from overnight fasted subjects at 8:00-9:00. The sera were obtained by centrifugation of the blood at the speed of 3 000 r/min for 5 minutes, and they were stored at -70 ℃ until use. The serum levels of corticosterone, cortisol, adrenocorticotrophic hormone (ACTH), cyclic adenosine monophosphate (cAMP), cyclic guanosine monophosphate (cGMP), free triiodothyronine (FT3), free thyroxine (FT4), thyrotropic-stimulating hormone (TSH), interleukin-1β and interleukin-2 were measured by enzyme-linked immunosorbent assay; the cAMP/cGMP ratio was also computed; and the differences of the above indexes were compared between the two types of subjects.Results: The serum levels of corticosterone, interleukin-1β, TSH and cAMP/cGMP ratio of yang deficiency constitution significantly increased as compared with those of normal constitution, and the serum levels of cortisol, ACTH, cGMP and FT4 of yang deficiency constitution significantly decreased in comparison with those of normal constitution.Conclusion: Subjects of yang deficiency constitution may be not only related to hypothalamic-pituitary-adrenal axis and hypothalamic-pituitary-thyroid axis, but also related to the functional disorders of cyclic nucleotide and immune systems.
Expanding Access with Satellite-Enabled Distance Education
Qi Wang
Journal of Systemics, Cybernetics and Informatics , 2006,
Abstract: Education and training became increasingly critical for citizens of every nation during the last century, and that paradigm will be no less true, throughout the 21st Century. As the world progresses fully into an information society, access to information and to a knowledge-based work force is a precondition for any country to remain competitive. Education, and increasingly distant education (DE), plays a vital role in turning human resources into knowledge workers. Information and communications technologies (ICT) have provided new ways to educate and to disseminate information that is crucial for creating these competitive, knowledge-based work forces. Modern DE, enabled by ICT-based networks and the Internet tools, offers great advantages that are leveling the global playing field, in terms of providing access and opportunities for specialized training and education. Using satellite technology in DE may be imperative to developing countries, where the majority of their populations are scattered in rural and remote areas. Where the traditional brick and mortar classrooms cannot easily reach, satellite-powered DE systems can. Through literature review and rational analysis, this paper examines how satellite-assisted DE systems expand education access.
On a shadow system of the S-K-T competition system
Qi Wang
Mathematics , 2013,
Abstract: We study a boundary value problem with an integral constraint that arises from the modelings of species competition proposed by Lou and Ni in \cite{LN2}. Through bifurcation theories, we obtain the existence of non-constant positive solutions over one-dimensional domain, which are small perturbations from the positive constant solution of the system. Moreover, we determine the stability of the bifurcating solutions. Finally, for the diffusion rate being sufficiently small, we construct infinitely many positive solutions with single transition layer, which is represented as an approximation of a step function that. The transition-layer solution can be used to model the phenomenon of species segregation through competitions.
Global solutions of a Keller--Segel system with saturated logarithmic sensitivity function
Qi Wang
Mathematics , 2013, DOI: 10.3934/cpaa.2015.14.
Abstract: We study a Keller-Segel type chemotaxis model with a modified sensitivity function in a bounded domain $\Omega\subset \mathbb{R}^N$, $N\geq2$. The global existence of classical solutions to the fully parabolic system is established provided that the ratio of the chemotactic coefficient to the motility of cells is not too large.
Boundary spikes of a Keller-Segel chemotaxis system with saturated logarithmic sensitivity
Qi Wang
Mathematics , 2013, DOI: 10.3934/dcdsb.2015.20.1231
Abstract: In this paper, we study the nonconstant positive steady states of a Keller-Segel chemotaxis system over a bounded domain $\Omega\subset \mathbb{R}^N$, $N\geq 1$. The sensitivity function is chosen to be $\phi(v)=\ln (v+c)$ where $c$ is a positive constant. For the chemical diffusion rate being small, we construct positive solutions with a boundary spike supported on a platform. Moreover, this spike approaches the most curved part of the boundary of the domain as the chemical diffusion rate shrinks to zero. We also conduct extensive numerical simulations to illustrate the formation of stable boundary and interior spikes of the system. These spiky solutions can be used to model the self--organized cell aggregation phenomenon in chemotaxis.
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