This paper designs a high-speed high-precision real-time data monitoring system for power electronic converter. Through SPI(Serial Peripheral Interface), the DSP requiring data monitoring sent data to ARM with Etherne...
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This paper designs a high-speed high-precision real-time data monitoring system for power electronic converter. Through SPI(Serial Peripheral Interface), the DSP requiring data monitoring sent data to ARM with Ethernet interface. After that, ARM sends the data to Lab VIEW through Ethernet interface. This paper uses Lab VIEW program to realize the receiving, grouping and display of multi-channel data.
In view of the problem of modulation recognition algorithm existing about low recognition rate under environment condition of low SNR,the algorithm of first-order cyclic moment are first presented used in band signal ...
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ISBN:
(纸本)9781510805750
In view of the problem of modulation recognition algorithm existing about low recognition rate under environment condition of low SNR,the algorithm of first-order cyclic moment are first presented used in band signal of VHF modulation classification recognition in this paper and the recognition rate increased *** first-order cycle frequencies at which estimated first-order cyclic moment magnitudes exceed the cutoff value were selected as candidate cycle frequencies based on estimation first-order cyclic moment at first-order cycle frequency series,then decided to choose the number of candidate cycle frequency by a cyclostationarity test to realize signal modulation classification recognition,the classification recognition rate can reach more than 98%under condition of SNR is greater than-6 dB.
This system, which can offer support of technology and test for the real power grid, applying simulation to ultrahigh voltage(UHV) and extra-high voltage(EHV) is put forward with the spread of the HUV and EUV substati...
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This system, which can offer support of technology and test for the real power grid, applying simulation to ultrahigh voltage(UHV) and extra-high voltage(EHV) is put forward with the spread of the HUV and EUV substations. Based on the theory of Newton-Ravson power flow method, this simulation system has the capability of imitating the primary device and secondary circuit, together with the normal, the abnormal and accidents in operation, and training substation operating staff or administrators. Through simulation in various situations, it validates that this design is capable of simulating the complicated faults in HUV and EUV in real time and accurately, in addition, it can analyses and dispose them efficiently.
DNS is the core basic services of Internet, the necessary segment for users to access Internet service, but it has serious security loopholes. This paper briefly introduces the basic concepts of DNS, security threats,...
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DNS is the core basic services of Internet, the necessary segment for users to access Internet service, but it has serious security loopholes. This paper briefly introduces the basic concepts of DNS, security threats, the basic principle of DNSSEC.
The paper mainly research is based on the DCT( discrete cosine transform) color image digital watermarking blind detection, the research object is the color image of the robust watermark, adding two random key, Amold ...
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The paper mainly research is based on the DCT( discrete cosine transform) color image digital watermarking blind detection, the research object is the color image of the robust watermark, adding two random key, Amold transformation and color image transformation to improve common watermarking discrete cosine transform technology,and select the Y component for the embedded watermark signal, in the watermark embedding after adding noise, cropping JPEG compression, filtering, attack, and blind extraction of digital watermarking. From the supply to the test results, to ensure the system in the embedded watermark imperceptibility but also maintained a good robustness, the accept various supply after the test, can also maintain a good visual effect.
In traditional collaborative filtering recommendation, the matrix sparsity and cold start restricted the accuracy of system. In this paper, we develop a way to enhance the recommendation effectiveness by merging neigh...
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In traditional collaborative filtering recommendation, the matrix sparsity and cold start restricted the accuracy of system. In this paper, we develop a way to enhance the recommendation effectiveness by merging neighborhood relationship and users keyword of social network information into collaborative filtering. We extend the calculation method of the TOP N neighbors which is the most important from two aspects. Our method expands the information capacity which can be used by collaborative filtering, improves the accuracy of recommendation and eases the cold start problem in recommendation system. We conducts experiment based on KDD 2012 real data set. The result indicates that our algorithm performs more superior than traditional collaborative filtering algorithm.
Voice-over-LTE (VoLTE) is a VoIP-based multimedia service which is provided using All-IP based LTE networks. VoLTE service was first commercialized by Korean telcos in 2012, and now more and more telcos are trying to ...
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ISBN:
(纸本)9781479982424
Voice-over-LTE (VoLTE) is a VoIP-based multimedia service which is provided using All-IP based LTE networks. VoLTE service was first commercialized by Korean telcos in 2012, and now more and more telcos are trying to adopt this technology. With the increased VoLTE service popularity, it is inevitable to have large VoLTE traffic volume (possibly degrading the service quality) and the potential attacks (possibly degrading the service reliability and availability) in the near future. Therefore, in order to avoid such potential issues, we need to perform thorough analysis on VoLTE traffic. As a first step, we propose a VoLTE traffic classification method and its distributed architecture. As the proposed classification method relies on Deep Packet Inspection (DPI) technique, it severely suffers from the large processing time and scalability issues. To overcome these issues, we further propose a distributed architecture for VoLTE traffic classification by adopting a high throughput computing framework - HTCondor. We performed a set of experiments using real-world traces captured from a commercial LTE core network, and have shown that with the proposed architecture, we can achieve up to 23.869 Gbps classification throughput which was almost 35 times faster than the system without distributed processing.
This paper based on the present development situation of the most enterprises material inventory management system. Aiming at the existed problems and deficiency of the materials inventory management system, combined ...
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ISBN:
(纸本)9781510806481
This paper based on the present development situation of the most enterprises material inventory management system. Aiming at the existed problems and deficiency of the materials inventory management system, combined with the actual needs of modern inventory management and advanced technology of computer software development technology, and designed a scientific and practical materials inventory management process. The process can monitor the order information of the materials, and provide some functions the real-time querying, report printing and the annual inventory analysis, etc, achieved a materials inventory management system based on B/S structure. The practical application shows that the system has good practicability and maneuverability.
The distributed seismic data acquisition system is a critical component to telemetry digital seismograph,while the performance of digital seismograph is subject to the performance index of this data acquisition system...
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ISBN:
(纸本)9781510805750
The distributed seismic data acquisition system is a critical component to telemetry digital seismograph,while the performance of digital seismograph is subject to the performance index of this data acquisition system.A distributed seismic data acquisition system with high accuracy and low power dissipation which is applicable to large scale wired digital telemetry seismograph was developed with high accurate analog-digital conversion technology,FPGA embedded technology and low power consumption technology in this *** system qualifies A class standard specified in SY/T5391-2007 in the aspects of equivalent input noise,harmonic distortion,dynamic range with unique features of low power consumption and low cost.
Many people would like to purchase items using locationbased services to find the suitable stores in daily *** there are many online map search engines giving isolated Point-of-Interest as query results according to t...
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Many people would like to purchase items using locationbased services to find the suitable stores in daily *** there are many online map search engines giving isolated Point-of-Interest as query results according to the correlation between isolated stores and the query,this interaction is difficult in meeting the shopping needs of people with disabilities,who would usually prefer shopping in one single location to avoid inconvenience in *** this article,we propose a framework of map search service using Region-of-Interest(ROI) as the query result,which can greatly reduce users shopping distance among multiple *** order Voronoi diagram is used to reduce the time complexity of Region-of-Interests *** results show that our method is both efficient and effective.
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