Wang H.-R.,Beijing Normal University |
Lin X.,Beijing Normal University |
Liu Q.,Beijing Normal University |
Feng Q.-L.,Beijing Institute of Education |
Liu C.-M.,Beijing Normal University
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2010
The ergodicity analysis of temperature variation is significant for medium and long-term weather forecast. The ergodicity of the month-highest temperature, month- lowest temperature, and month-average temperature in Beijing was discussed in this study. Firstly, each kind of temperature was clustered applying the systematic clustering method by taking a month as the individual. Based on this, autocorrelogram was used to eliminate the periodicity series and ADF (Advanced Dickey & Fuller) was employed to test the stationary of the rest series. And then, ergodicity analysis was carried out to the series that had passed the stationary test, including mean ergodicity and covariance ergodicity. The results obtained from the above steps show that the month-highest temperature series of June, July and August has the mean ergodicity; the lowest temperature series of April and October has the progress ergodicity. For the long period, the two kind temperature series fluctuate around the mean temperature. For the lowest temperature of April and October, the temperature of the former time unit has a relatively stable impact on the latter time unit. At the end of this work, confirmation and further dig analysis also were carried out. The study results of former researchers were validated from the perspective of ergodicity in this study.
Liang W.,Beijing Institute of Education |
Yu S.,Beijing Normal University |
Long T.,University of Tennessee at Knoxville
IET Conference Publications | Year: 2011
As an emerging mobile terminal, tablet computers have begun to enter into the educational system. For better understanding the application and people's perspectives of the new technology in K-12 schools in China, a survey was conducted to investigate tablet computer's application, user's perspectives and requirements among K-12 students, teachers and educational administrators in urban areas in China. The findings of the study showed that people still need deeper understanding of the new technology's application in K-12 education. In addition, this study stated that in order to introduce tablet computers into K-12 education, more attention should be paid to the comprehensive design of the whole educational system, including the design of the learning support system and instructional strategies, as well as the design and development of educational software and resources.
Wang H.,Beijing Normal University |
Ye L.,Peking University |
Xu X.,Beijing Normal University |
Feng Q.,Beijing Institute of Education |
And 3 more authors.
Science China Technological Sciences | Year: 2010
Surface precipitation estimation is very important in hydrologic forecast. To account for the influence of the neighbors on the precipitation of an arbitrary grid in the network, Bayesian networks and Markov random field were adopted to estimate surface precipitation. Spherical coordinates and the expectation-maximization (EM) algorithm were used for region interpolation, and for estimation of the precipitation of arbitrary point in the region. Surface precipitation estimation of seven precipitation stations in Qinghai Lake region was performed. By comparing with other surface precipitation methods such as Thiessen polygon method, distance weighted mean method and arithmetic mean method, it is shown that the proposed method can judge the relationship of precipitation among different points in the area under complicated circumstances and the simulation results are more accurate and rational. © 2010 Science in China Press and Springer Berlin Heidelberg.
Zeng W.,Beijing Normal University |
Feng Q.,Beijing Institute of Education
Proceedings - 2010 7th International Conference on Fuzzy Systems and Knowledge Discovery, FSKD 2010 | Year: 2010
In this paper, we introduce the concepts of Sh-interval valued fuzzy left ideal, Sh-interval valued fuzzy right ideal, S h-interval valued fuzzy ideal and extension principle of interval valued fuzzy set, investigate some properties and propose some theorems for homomorphic image and its inverse image on Sh-interval valued fuzzy ideal. Finally, we investigate some properties on character of S h-interval valued fuzzy left(right) ideal. ©2010 IEEE.
Liu X.,Hebei United University |
Feng Q.,Beijing Institute of Education |
Zhang Y.,Hebei United University |
Li Y.,Hebei United University
Lecture Notes in Electrical Engineering | Year: 2013
Independent College is a new school model of Higher Education in our country, how to train students to adapt to the needs of society is its urgent problem. From the practical teaching, this paper analyzes the current situation and point out the problems on Probability theory and Mathematical Statistics in Independent Colleges, and proposes a solution to optimize the teaching methods, including case teaching method, mathematical modeling, multimedia teaching, hierarchical teaching and Analogy teaching method. All this methods want to change the mode of purely mathematics teaching and guiding the students to solve statistical problems around, so as to stimulate students' interest and motivation in learning, to laying a solid foundation for the study of specialized courses. © 2013 Springer Science+Business Media.
Li H.,Tsinghua University |
Huang L.,Beijing Institute of Education |
Zhang Y.,Tsinghua University |
Ni S.,Tsinghua University
Safety Science | Year: 2016
We present novel evidence showing that people prefer searching for an exit and avoiding smoke rather than following the crowd regardless whether with intuition or deliberation when the crisis situation was activated. Intuition leads to more obvious preferences on escape judgment and decision-making than does deliberation under unconscious priming condition. People are more cautious with decision-making than judgment across two experiments. Priming method was adopted because the same primes tend to activate different associative links for different people (Cameron et al., 2012). Across two experiments, reliable and consistent evidence shows that when facing a crisis (e.g., fire), searching for an exit and avoiding smoke are preferred by people rather than following the crowd. In Experiment 1, we demonstrated that searching for an exit and avoiding smoke were judged as more helpful than following the crowd by both intuition and deliberation regardless whether the situation is simple or complex. In Experiment 2, we found that intuition has a more significant influence on judgment and decision-making than deliberation under both simple and complex situations. Our findings contribute to the crisis literature by demonstrating that people less prefer to follow the crowd when escaping from crisis situations, and that intuition is more effective under unconscious priming condition. © 2016 Elsevier Ltd
Liu J.,Nanjing University of Aeronautics and Astronautics |
Xue L.,Commercial Aircraft Corporation of China |
Liu S.-F.,Nanjing University of Aeronautics and Astronautics |
Feng Q.-L.,Beijing Institute of Education
Kongzhi yu Juece/Control and Decision | Year: 2010
For the unsure attribute weights problem of multiple attribute decision, the paper proposes the superiority index relationship between the decision-making object and the ideal object has the relation of equivalence with the probability measure of attribute value. According to minimal and maximal rules, this paper propose the measurement of attribute value based on superiority index relationship. Then following the superiority index relationship between each decision making object and overall object, the information weights are ranked and picked over. Finally, the probabilistic multi-attribute decision making problem of using attribute value as interval number is analyzed. At the same time, the characters between maximizing deviations and the algorithm proposed are compared, which shows the effectiveness of the algorithm.
Lei-Ming,Civil Aviation University of China |
Zan-Yuping,Beijing Institute of Education
IET Conference Publications | Year: 2014
FLASHGET is a well-known and typical downloading application which belongs to P2P categories. It makes sense to identify and control its protocol accurately. However, it cannot be analyzed by using conventional methods because the process of its downloading is encrypted. For cryptographic protocol, a technique based on protocol reverse engineering was proposed. This method is used by reverse analytic tools to reverse out decryption functions to obtain the structure of protocol and the meaning of encrypted field, and then interferential packages could be constructed, as well as the FLASHGET protocol could be controlled by the bypass interference. The experimental results show that this method can identify and control FLASHGET effectively. In addition, the method also provides a reference to other similar P2P downloading protocols.
Zhang Y.P.,Beijing Institute of Education |
Zhang Y.P.,Lanzhou University |
Nan Z.B.,Lanzhou University
Seed Science and Technology | Year: 2010
Water is an important resource for developing seedlings and water availability is a crucial factor in the germination stage. Elymus dahuricus is an important grass in the northern arid rangelands of China and growth and biomass under drought stress were increased by Neotyphodium endophyte infection. In this study, the effects of varying osmotic potentials on germination of six E. dahuricus populations with different endophyte infection frequencies were investigated and the activities of superoxide dismutase (SOD) and peroxidase (POD) enzymes were measured in seedlings that had germinated under varying osmotic potentials. All seeds showed reduced germination as the water availability decreased, but seeds from the Baiwangshan population (100% infection) maintained the highest level of germination. The activities of SOD and POD increased as water availability decreased in all populations, but acitivities were greatest in the Baiwangshan population. Our results supported the hypothesis that Neotyphodium endophyte infection increases germination of E. dahuricus under different osmotic potentials pressure, but the endophyte performance differs between different populations.
Jin Y.,Beijing Institute of Education |
Tao S.,China University of Technology |
Jianjun S.,China University of Technology
WIT Transactions on Information and Communication Technologies | Year: 2014
The rise of cloud computing provides a business process for dynamic optimization of the enterprise for new thinking. Its top SaaS can be used according to the different needs of users, and its flexibility provides a mechanism for on-demand customization. A genetic algorithm is a general problem-solving method. In view of the poor local search for a genetic algorithm for this problem, we introduce the simplex algorithm, a hybrid genetic algorithm to improve search efficiency of a genetic algorithm. With business objects as an optional granularity of a business process, the fitness value of the largest business object composition sequence can be chosen. Finally, we can verify this instance by using Matlab tools. © 2013 WIT Press.