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This work utilizes the dynamic current scaling (DCS) to control the pMOS array for outputting the sufficient operating current. It makes the FFT modules work under the lower power-consummation operating mode. Furthermore, to guarantee the DCS current is enough for the whole system. We need the online error detection. In this work, we just apply the adaptive sequential elements to determine the critical...
Hive is the most mature and prevalent data warehouse tool providing SQL-like interface in the Hadoop ecosystem. It is successfully used in many Internet companies and shows its value for big data processing in traditional industries. However, enterprise big data processing systems as in Smart Grid applications usually require complicated business logics and involve many data manipulation operations...
In this paper, we disclosure a cost-efficiency FFT via hardware-reduction and dynamic current scaling (DCS) schemes in a low-power OFDM modem. These reductions are realized by the pipelined data path modifying and the hardware sharing at two stages. For low power, the operating current is scalable to reduce power consumption, namely DCS. All our works are synthesized and simulated by the TSMC 65nm...
There is an increasing interest in two-stage four-leg matrix converter (3×4TSMC) which provides a neutral connection for potential imbalanced loads. However, the fourth leg will worsen its operation performance unexpectedly, even if connected to the balanced loads. By means of analysis and calculation, it is found that the input filter capacitor voltage fluctuation will transfer to the output in the...
Most first year computer science students would find that learning object-oriented programming is hard. Serious games have ever been used as one approach to handle this problem. But most of them cannot be played with mobile devices. This obviously does not suit the era of mobile computing that intends to allow students to learn programming skills in anytime anywhere. To enhance mobile teaching and...
This paper presents an imaging method of FMCW SAR with diving acceleration. The motion parameters measured by the GPS/IMU integrated navigation device on the platform are used for constructing the target range expression in high-order approximation. The series reversion algorithm is used to evaluate the accurate expression of the received signal in Doppler frequency domain. The simulation is presented...
With the development of technology and equipment's reliability, more and more accidents are caused by human error, so it is very important to do some research for analyzing the aviation accidents due to human factors. The appearance of Support Vector Machines(SVM) provides a new way to solve the problem. However, human factors accidents have great uncertainty in aviation, traditional SVM showed some...
Using micro level data of Chinese industrial listed companies in 2004–2012 and macro level data of 30 provinces, municipalities and autonomous regions, we applied the stochastic frontier model and the hierarchical linear model to empirically test the impact of the regional environment on enterprise R&D efficiency, and draw the following conclusions: the research and development activities of enterprise...
Under the circumstance that network education has been more and more universal, educational website resource has developed to the trend of multi-media, the video resources, in particular, more and more widely are used. In order to deal with the problem of overflowing of educational website and video resource, the low efficiency of students in selecting valuable video resource, the author design a...
The Community Question Answer (CQA) service is a typical forum of Web 2.0 that shares knowledge among people. There are thousands of questions that are posted and solved every day. Because of the various users of the CQA service, question search and ranking are the most important topics of research in the CQA portal. In this study, we addressed the problem of identifying questions as being hard or...
This paper presents a high squint imaging method for frequency-modulation continuous-wave (FMCW) synthetic aperture radar (SAR) with high speed. In high squint operation mode for FMCW SAR a quadratic phase error (QPE) is induced by the high speed and the high squint angle, which effects the focusing of range profile. Firstly the received signal expression in the wave number domain is deduced, and...
It is found that current ontologies for security often emphasize the security concerns and concepts without their involvement in each of stages of a software development process. This means that the security concerns and concepts will not be actually considered throughout the development process. This leads a lack of approaches to involving security concerns and concepts throughout the development...
Sometimes, we find decision situations in which it is difficult to express preferences by means of concrete preference degrees. The consistency measure is a vital basis for consensus model of group decision making, and includes two sub problems: individual consistency measure and consensus measure. In this paper, a consensus model for multiple attribute group decision making problems in which the...
There are two main research topics about ECG signal proposed. One is the noise reduction, and the other is R peaks detection. Both of the two algorithms are based on discrete wavelet transform (DWT). DWT is efficient for analyzing nonstationary signals like ECG signal. The Symlets wavelets (sym5) and soft-thresholding are chosen as the wavelet function and thresholding method to do noise correction...
The PBGA (Plastic Ball Grid Array) stacked solder bump finite element analysis model was set up, the temperature field analysis and thermal-structural coupling analysis were carried out under power load based on the model. The effects of solder pad size and solder volume on thermal stress distributed in the solder ball were analyzed. The results illustrated that the distribution of temperature in...
The high reliability and long life characteristics of electronic products result in long degradation test time and low efficiency. Traditional degradation test depends on priori information and statistical analysis method is complex. In view of those problems, an evaluation method of step-down stress accelerated degradation modeling based on Gamma process is proposed. Firstly, the degradation path...
Orthogonal frequency division multiplexing (OFDM) is a popular transmission technique used in wireless communication systems. However, OFDM has deficiencies that must be improved, including a high peak-to-average power ratio (PAPR) in the transmission signal. The tone reservation (TR) scheme is an efficient PAPR reduction method used in OFDM systems. Although the TR scheme can achieve good PAPR performance,...
This dissertation put forwards an improved algorithm of image registration based on the combination of SIFT and CONTOURLET Transform. The first thing is that the image will be decomposed into low-frequency sub-band and high-frequency sub-band by using CONTOURLET Transform. The next step is to extract the image's edge feature points by setting a reasonable threshold value to the high-frequency sub-band,...
This article according to the author based on task drive in the experimental teaching mode of research achievements in the foundation, use SPSS technology research and analysis of the mode of learners' learning achievement and learning attitude. The results show that the teaching mode can actually in certain environment, to improve the students' learning achievement, improve learners' learning attitude.
It is seen that Weather Forecast Models (WFMs) are often implemented using the sequential programs. This usually takes longer execution time, larger computer resources and more power as WFMs involve high level computational tasks to process large amount of weather forecast data. These become problems for the weather forecast companies in terms of WFM performance. The companies have already tried to...
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