Advanced Materials Research Vols. 756-759

Abstract: The coordination of two-echelons supply chain by buyback contract under the imperfect product quality and fuzzy demand environment is investigated in this paper. The mathematical models are built based on credibility theory, and the optimal parameters of buyback contract are obtained. In addition, the influence of the imperfect product rate on the parameters of buyback contract is analyzed. Finally, a numerical example is presented to demonstrate the solving processes of the models and the different effects of imperfect product rate on parameters of buyback contract and the fuzzy expected profit value of all members in supply chain.

Abstract: It is quite inadequate in providing formula retrieval function by traditional retrieval techniques used in full-text information retrieval system. The main reason is that there are many difficulties to extract the keywords of the mathematical formulas. In this paper, a detailed analysis of the structural characteristics of mathematical formulas and existing index mechanism of mathematical formula searching engine is fulfilled. Then a full-text index (named SLIndex) of mathematical formulas with B+ tree structure is designed and implemented which extracts the structured logic sub-tree feature as keywords of formulas and employs inverted index. Finally, a formula search engine model based on SLIndex is implemented in Apache 2.0 web server.

Abstract: This paper makes an introduction to the tendency of mobile internet replacing the fixed-line network. Analysis of the impact of Smart terminals on mobile internet is expounded. Network performance is degraded by huge data service traffic and signaling traffic. This paper also offers solution for the current situation

Abstract: The same scene, the infrared image and visible image fusion can concurrently take advantage of the original image information can overcome the limitations and differences of a single sensor image in terms of geometric, spectral and spatial resolution, to improve the quality of the image , which help to locate, identify and explain the physical phenomena and events. Put forward a kind of image fusion method based on wavelet transform. And for the wavelet decomposition of the frequency domain, respectively, discussed the principles of select high-frequency coefficients and low frequency coefficients, highlight the contours of parts and the weakening of the details section, fusion, image fusion has the characteristics of two or multiple images, more people or the visual characteristics of the machine, the image for further analysis and understanding, detection and identification or tracking of the target image.

Abstract: A three-stage-structured prey-predator model with multi-delays is considered. The characteristic equations and local stability of the equilibrium are analyzed, and the conditions for the positive equilibrium occurring Hopf bifurcation are obtained by applying the theorem of Hopf bifurcation. Finally, numerical examples and brief conclusion are given.

Abstract: The research tries to solve the problems related to teaching agent technology in cooperative learning system. Aiming at the fact of present learning system being unable to realize real-time intelligent teaching for students, a creative idea of teaching agent mode based on web cooperative learning system is put forward after studying the technology of student agents reasoning algorithm, learning path agent, and teacher agents. This mode may help to realize self-adaption teaching in cooperation center on digital campus. Besides, it provides new ideas or methods of internal demands for establishing web cooperative learning center. Fact shows that teaching agent can improve teaching effect and quality through individualizing the teaching materials and attracting the students.

Abstract: Sini Decoction is a traditional Chinese medicine which has a curative effect. The mode of action between small molecules and the targets were presented visually, which provided an in-depth interpretation about the pharmacodynamic material basis. It is valuable for the research and development of new drugs. Experimental results show that we can reveal the treatment mechanism of Sini Decoction in molecular level by molecular docking.

Abstract: Mobile internet as one operating system has already become very mature. But traffic billing is a hot issue among mobile complaints currently. In order to adjust the instability of mobile traffic billing system, adjustment is being made on multiple aspects of the stability to solve the problem of the variable billing system. The internet traffic billing system is stabilized through the establishment of mobile internet traffic billing system, system of mobile internet traffic accumulation and mobile internet identification system, while combining with system of reminding with text messages of mobile phone. In order to carry out the executive process, take for example the cases of the internet traffic billing system of two major communication operators in China. Analysis on the examples showed that with multiple subsystems assistance, internet traffic billing system can make more accurate calculation and system of monitoring mobile Internet will monitor the use of traffic and provide the most stable methods of billing internet traffic. The combination of multiple systems can better eliminate the errors caused by the instability of the mobile internet traffic billing system. * Chunyan Lei is the first author; Bin Huang is the correspondence author The mobile internet has become one of the main channels of accessing to external information, and more people choose handheld type to browse information. Because the related coverage of information is becoming broader and broader, the interests are related to higher extent; the requirements for data accuracy of audience is higher and higher, it is very necessary to establish internet traffic billing system that is accurate, safe and user-friendly so that the stable traffic billing system can provide the accurate process of traffic usage more stably.

Abstract: With the rapid development of the software industry in the 21st century, the traditional software is increasingly constrained by the costs and software and hardware environment. As a result, the SaaS emerged and quickly gained public acceptance. In order to use SaaS services, the users dont have to cost a lot of money to purchase entire software, only need to pay for the corresponding modules they ordered. By analysis of current oilfield software, we present a software layout mode which combines C/S and B/S model, and solve a series of problems in data storage and interaction, finally implement a SaaS framework in oilfield software industry.

Abstract: This paper proposed a robust portfolio model, using CDaR to measure portfolio risk. Due to uncertainty parameter, we constructed ellipsoidal uncertainty set as the parameters uncertainty set to maximize the portfolio return. We verified the operable of the model with numerical simulation. The result shows that the risk is higher compared to without robust case, which is helpful to cautious investment for investors.