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Photonic bandgap fiber have progressed rapidly in recent years and is of great interest for optical fiber sensors applications because of the bandgap effect, high thermos-optical coefficient and birefringence coefficient. The high temperature and stain sensitive is attractive and significant for sensors application. Optimal design themicro-structure of all-solid photonic bandgap fiber with is necessary...
Nowadays China's policy of encouraging mass entrepreneurship and innovation is widely known, a new round upsurge of pioneering enterprises has gained wide public attention. Under this background, how can we improve the graduate education quality and make the potential students stick to scientific research rather following the trend is what we should consider seriously. In this paper, we put forward...
With the rapid development of online education in China, how to improve the quality of online education has been the focus of education research. In the internet teaching practice, how do learners keep learning online? Does learning really happen during the process? This article attempts to discuss about the problem from three parts. The first part concludes the conditions in which online learning...
Lifelong learning and continuing education are the need of social development and the improvement required by society. This paper gives them a new relationship that the two is dialectical unity, namely they are different, related and mutually developed. Continuing education should be carried out throughout people's whole life via various kinds of ways to promote lifelong learning. This paper states...
This thesis is primarily concerned with the phase difference measurement and correction in ΔDOR with the VLBI system. The phase will be changed by the filters and the DDS in each channel and we propose a method to correct the phase difference.
Along with the development of high-speed railway, higher and higher technical requirements for the mobile communication system in it are raised. Communication Based Train Control (CBTC) will be based on mobile communication, of which the key problem is how to support high reliability of data transmission in order to improve utilization of tracks and enhance train's safety. The applications of LDPC...
To accurately estimate the stage-of-charge of the lithium ion battery, a method based on Multirate Extended Kalman Filter is applied. A equivalent circuit model is built and the mode parameters are estimated based on the experiment data of charging and discharging the battery. The coulomb counting, Single Rate Extended Kalman Filter and Multirate Extended Kalman Filter are used to predict the SOC...
Because of their advantages of no memory effect, relatively long lifetime, and high energy density, lithium ion batteries have now become one of the most popular rechargeable batteries. However, there are some limitations on the usage of these batteries such as low temperature tolerance, potential danger of overcharge, and potential damage of over discharge. Therefore, a battery management system...
This paper focuses on design and implementation of a receiver supporting high-bandwidth digital content protection (HDCP). Besides architectural analysis and design approach discussions, a detailed micro architecture is proposed and implemented. Cipher datapath, controller, registers and I2C interface are implemented, and both place-and-route and custom design method is used. The HDCP receiver is...
This paper focuses on architectural modeling and simulation of chip multithreaded processors. Chip multithreading combines chip multiprocessing and hardware multithreading to build a processor chip with multiple multithreaded cores. Besides theoretical analysis and modeling approach discussion, an instruction level simulation model is implemented as a set of extensions to the Simics machine simulator...
This paper presents the design and implementation of moving objects detection system based on TMS320DM643 (DM643). It focuses on hardware design, algorithm design and system integration. A fast and effective moving objects detection algorithm adapted to DSP implementation based on the improved Gaussian Mixture Models is represented in the paper to enhance the precision and reliability of moving objects...
With the further development in astronomy and deep space exploration, the incremental improvements to be expected in the VLBI is real-time, high sensitivity, high reliability and wider frequency coverage. The VLBI data acquisition backend plays an important role in the VLBI station. Recently, based on advances in digital hardware like ADC (Analog-to-Digital Conversion), DSP (Digital Signal Processing),...
For the realization of a safe train traffic environment, a wireless communication system which makes an information network between ground and vehicles has been needed. Low-density parity-check (LDPC) codes have been widely considered as error-correcting codes for next generation communication systems. In this paper, vehicle condition detect system (VCDS) channel coding methods were given. Then some...
Railway vehicle information collection is an important section for the traffic safety on the urban railway and it is helpful and necessary to monitor the fault behavior of railway vehicle. So probe-vehicle technique is an effective method of collecting real-time traffic information on train-ground networks. A technically feasible and cost-effective wireless communication network is in great demand...
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