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Two semantics, a strong semantics and a weak one, are usually adopted by time Petri nets in different application context. However, both of them are not suitable for the schedulability analysis of real-time systems. The scheduling ability of the strong semantics model is limited because of the constraints of the strong timing, whereas the weak one can not guarantee the timeliness of schedules due...
In this paper, we propose a optimization method of watermarking image based on Cort and DCT. Exploiting human visual system characteristics, our method dynamically chooses the appropriate coefficients of the intermediate frequency and watermarked locations according to different image. Experiments show that the watermarking algorithm performs well in robustness and watermarking imperceptibility.
The development of interactive television has the potential to open new possibilities for electronic commerce, linked to the broadcasting of audiovisual contents. To cater for the commercial needs of increasing customers, more and more enterprises have started to expand their business from internet to television again. Interactive television technologies which act as media of electronic commerce,...
Mobile multimedia broadcast is a result of the development of the digital TV under the trend of network convergence. In this paper, according to the requirement of authentication and authorization, the particularities of mobile multimedia broadcast are analyzed. The problems of traditional conditional access and digital right management in mobile multimedia broadcast are shown. A new scheme of authentication...
The development of information technology and electronic commerce (E-commerce) has led to great changes in the tourism industry in many countries around the world including China. Traditional tourism are faced with great opportunities and challenges because of the information revolution,. With E-commerce development, traditional tourism value chain has encountered problems and begun to reconfigurate.
This paper considers a credit default swaps (CDS) pricing under a fractal structural model, where the asset value is generated by a geometric fractional Brownian motion. In contrast to the classical structural model which is based on the geometric standard Brownian motion, the fractal one with long-dependent and self-similar behaviors matches the real asset data better. We analyze the ratio of a firm's...
The selection of Chinese rural land requisition path plays a crucial role on whether social benefits occurred by land requisition could be maximized. In this paper the dynamic optimization problem of land requisition is aimed at by the government. A dynamic analysis method is utilized through Optimal Control Theory. The dynamic optimization model is established with no budget-constraining then its...
We modeled the interpersonal influence process by cooperative game. The model implied that reducing interpersonal contact is an important way to improve current evaluating effect. In the same time, the application of university information systems provides the possibility to collect quantitative data without interpersonal contact. Then the architecture of evaluating system was proposed and implemented...
Most of current research focuses on students and how technology affects them, but less has been done to describe the role of the teachers, especially in the context of E-education. The paper is to find the way to solve the problem. This study finds that firstly, Students need their teacherspsila help both psychologically and technically in the context of E-education. Secondly, itpsilas the teacherpsilas...
It is well know that Ekeland variational principle is widely used in optimal theory, in optimal theory, mathematics on economics , management and so on. In this paper, we extend Ekeland variational principle to a random metric space, which makes it be suitable for random optimal theory. Then by using the new result we consider the existence of random approximate minimum point for a class of random...
One of the main purposes of Chinese ldquogoing outrdquo strategy is to get the access to overseas advanced technology and enhance Chinese firmpsilas technological innovation capability. As an integral part of ldquogoing outrdquo strategy, outward foreign direct investment (FDI) can facilitate technology spillover into home country through R&D resources sharing mechanism, one-way technology communication...
Based on spatial panel data models and province data of Chinese electronic communications industry in 1997-2007, this paper gets an estimate of Chinese electronic communications industrypsilas province level production fuction.We focus on the source of the fund in scientific and technological activities funding. The result shows that the source of load contributes much less output of Chinese electronic...
Co-word analysis is a typical kind of content analysis, and also it is an important content mining method. It has been widely used in medicine, chemistry, artificial intelligence, software engineering, information science and information system. By the use of SPSS software, this paper analyzes co-word of the articles on UML issued in the periodicals from year 2001 to 2008 collected by CNKI database...
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