We carried out research & analysis and development & design on the problems such as unreasonable structure of outdated process equipment and device, imperfect matching process and incomplete process link in th...
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In order to solve the problems of slow information feedback, long monitoring cycle and high cost of traditional traffic signal detection method, a new intelligent traffic signal monitoring system based on sensor and u...
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ISBN:
(纸本)9781728121482
In order to solve the problems of slow information feedback, long monitoring cycle and high cost of traditional traffic signal detection method, a new intelligent traffic signal monitoring system based on sensor and upper computer development system is designed. the system uses the light sensor with double monitoring circuit of current sensor, and clever applies the hall element for current measurements, in the case of basic does not change the original circuit monitoring to the traffic lights work of real-time data to avoid affecting the original circuit of traffic lights, meantime, it have improved the reliability and stability of the monitoring.
Data consistency is very important in relational databases, because relational databases are adopted by most operational database and inconsistent data can generate inconsistent reports or search results. In order to ...
One of the major problems for accurate channel estimation in OFDM system is a phase noise. the distortion caused by phase noise is characterized by a common phase error (CPE) term and an inter-carrier interference (IC...
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ISBN:
(纸本)9781728113227
One of the major problems for accurate channel estimation in OFDM system is a phase noise. the distortion caused by phase noise is characterized by a common phase error (CPE) term and an inter-carrier interference (ICI) term. Current phase noise suppression algorithms obtain channel state information (CSI) by separating CPE and ICI from channel impulsive response (CIR). However, the received signal is determined by not only CPE and ICI but also CIR. Since all of them are unknown and the number of CPE, ICI, and CIR exceeds the length of observation vector, channel estimation in phase noise environment is an underdetermined problem. It is very difficult to obtain CSI through separating the CPE and ICI from CIR. this paper proposes two novel channel estimators for phase noise based on Maximum Likelihood Estimator and Minimum Mean Square Error Estimator. Since the proposed methods treat the CIR and CPE as a whole unknown parameter and regard the ICI as additive noise, they reduce the number of the unknown parameters and make the problem solvable. the corresponding deterministic and stochastic Cramer-Rao lower bounds (CRLBs) are also derived for phase noise situation which have not been studied in the literature.
Political sentiment analysis using social media content has recently attracted significant interest. this paper focuses on analyzing tweets in Greek regarding the recent European Elections. A hybrid method that combin...
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Withthe development of high-speed railway, it is necessary to design a traction control system with high performance, high stability, and high system integration. the CPCI bus is widely used in industrial automation ...
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Withthe continuous development of computer technology, virtual reality technology has been applied more and more in traditional teaching. In order to improve the students' interest in learning Chinese acupuncture...
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ISBN:
(纸本)9781728146898
Withthe continuous development of computer technology, virtual reality technology has been applied more and more in traditional teaching. In order to improve the students' interest in learning Chinese acupuncture, this paper studies the key technologies in the development of virtual acupuncture teaching software based on virtual reality technology. Model the human body is modeled and pays attention to the contour drawing of the key parts of the human body. the software combines withthe current most popular virtual reality device HTC VIVE and uses the Unity3d software to create virtual scenes. Finally, acupoint information models are represented and stored through JavaScript Object Notation (JSON) language, which completes the design of human-computer interaction mode. the implementation of virtual reality technology provides a new method and reference solution for assisting Chinese acupuncture teaching.
Fast Fourier Transform (FFT) is one of the core algorithms in digital signal processing. the traditional FFT processing method can no longer meet the data processing requirements, so the implementation and optimizatio...
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ISBN:
(纸本)9781450387811
Fast Fourier Transform (FFT) is one of the core algorithms in digital signal processing. the traditional FFT processing method can no longer meet the data processing requirements, so the implementation and optimization of the better performance radix-4 FFT algorithm has very important research value. Based on FPGA technology, this paper proposes a design scheme of radix-4 FFT algorithm processing system. By optimizing the butterfly processing unit, the system realizes a high-performance FFT algorithm processing system with characteristics of faster operation speed, higher calculation accuracy, easy hardware implementation and large capacity compared withthe traditional FFT processing method. It is well suited for scientific computing, image processing and other fields.
In order to solve the problem strapless in the de-filming mechanism in the process of de-release, tied in the picking of teeth on the residual film can not be taken into the film box and waste power and other problems...
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ISBN:
(纸本)9781728146898
In order to solve the problem strapless in the de-filming mechanism in the process of de-release, tied in the picking of teeth on the residual film can not be taken into the film box and waste power and other problems, the design of the rotary residual film picker release mechanism. the theoretical analysis shows that the device is feasible in the recovery of residual film. the test results show that the release rate of rotary residual film picker release mechanism reaches 90.5%, which meets the requirements of the farmers for the release mechanism of the residual film picker, and provides a new way of thinking for the design of the residual film recycling machine release mechanism.
Nowadays, the development of Internet finance is in full swing. the application of the Internet will certainly play a vital role in the rapid changing stock market, such as inquiring the stock market, analyzing the tr...
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