It is a bold attempt to combine the Internet with the offline classroom in depth, use the smart learning platform, combine online teaching with big data analysis, and use the smart classroom teaching mode to teach eco...It is a bold attempt to combine the Internet with the offline classroom in depth, use the smart learning platform, combine online teaching with big data analysis, and use the smart classroom teaching mode to teach economics courses. In this paper, the construction of smart classroom teaching model for economics courses is analyzed in the early stage. Through questionnaires, the students' learning status and teaching model status are investigated, and the feasibility of the implementation of smart classroom teaching model is analyzed from both theoretical and practical perspectives. The results show that the implementation of smart classroom teaching model in economics course of Xinjiang Agricultural University is necessary and has good subjective and objective basis and feasibility, which provides the basis and basis for the construction of new teaching model.展开更多
A new quadrature coded OFDM system is proposed. The transmitted data symbols are grouped in such format that the in phase side and the quadrature side of the symbols are arranged in opposite order. By analysis an...A new quadrature coded OFDM system is proposed. The transmitted data symbols are grouped in such format that the in phase side and the quadrature side of the symbols are arranged in opposite order. By analysis and simulation, the performance of the new system can be improved greatly, as well as the harmful influences on the system owing to frequency offset can be reduced effectively, which can combat the disadvantages of OFDM system.展开更多
A sub-optimum m-sequence method for reducing PAR distribution inPTS-OFDM is proposed in the pa- per. In order to reduce thecalculation load introduced by optimum PTS method, m-sequence offinding the optimum side infor...A sub-optimum m-sequence method for reducing PAR distribution inPTS-OFDM is proposed in the pa- per. In order to reduce thecalculation load introduced by optimum PTS method, m-sequence offinding the optimum side information can be utilized, which will notbring very heavy burden to the OFDM system since the cal- culationcomplexity is determined mainly by the number of IDFT at the cost ofPAR distribution performance of OFDM system.展开更多
Unlike wired networks, random packet loss due to bit errors may cause significant performance degradation of Transmission Control Protocol (TCP). We propose and study a novel end-to-end congestion control mechanism ca...Unlike wired networks, random packet loss due to bit errors may cause significant performance degradation of Transmission Control Protocol (TCP). We propose and study a novel end-to-end congestion control mechanism called TCP-LD (Loss Detection) that is simple and effective for dealing with random packet loss. We also give its steady state throughput model. Both the ns2 and numerical simulation results show that our scheme can achieve significant throughput improvements without adversely affecting other concurrent TCP connections, including other concurrent Reno connections both in wired and wireless environment.展开更多
On the basis of introducing principles for hierarchical mobile Internet protocol networks, the registration cost performance in this network model is analyzed in detail. Furthermore, the functional relationship is als...On the basis of introducing principles for hierarchical mobile Internet protocol networks, the registration cost performance in this network model is analyzed in detail. Furthermore, the functional relationship is also established in the paper among registration cost, hierarchical level number and the maximum handover time for gateway foreign agent regional registration. At last, the registration cost of the hierarchical mobile Internet protocol network is compared with that of the traditional mobile Internet protocol. Theoretic analysis and computer simulation results show that the hierarchical level number and the maximum handover times can both affect the registration cost importantly, when suitable values of which are chosen, the hierarchical network can significantly improve the registration performance compared with the traditional mobile IP.展开更多
文摘It is a bold attempt to combine the Internet with the offline classroom in depth, use the smart learning platform, combine online teaching with big data analysis, and use the smart classroom teaching mode to teach economics courses. In this paper, the construction of smart classroom teaching model for economics courses is analyzed in the early stage. Through questionnaires, the students' learning status and teaching model status are investigated, and the feasibility of the implementation of smart classroom teaching model is analyzed from both theoretical and practical perspectives. The results show that the implementation of smart classroom teaching model in economics course of Xinjiang Agricultural University is necessary and has good subjective and objective basis and feasibility, which provides the basis and basis for the construction of new teaching model.
文摘A new quadrature coded OFDM system is proposed. The transmitted data symbols are grouped in such format that the in phase side and the quadrature side of the symbols are arranged in opposite order. By analysis and simulation, the performance of the new system can be improved greatly, as well as the harmful influences on the system owing to frequency offset can be reduced effectively, which can combat the disadvantages of OFDM system.
文摘A sub-optimum m-sequence method for reducing PAR distribution inPTS-OFDM is proposed in the pa- per. In order to reduce thecalculation load introduced by optimum PTS method, m-sequence offinding the optimum side information can be utilized, which will notbring very heavy burden to the OFDM system since the cal- culationcomplexity is determined mainly by the number of IDFT at the cost ofPAR distribution performance of OFDM system.
文摘Unlike wired networks, random packet loss due to bit errors may cause significant performance degradation of Transmission Control Protocol (TCP). We propose and study a novel end-to-end congestion control mechanism called TCP-LD (Loss Detection) that is simple and effective for dealing with random packet loss. We also give its steady state throughput model. Both the ns2 and numerical simulation results show that our scheme can achieve significant throughput improvements without adversely affecting other concurrent TCP connections, including other concurrent Reno connections both in wired and wireless environment.
文摘On the basis of introducing principles for hierarchical mobile Internet protocol networks, the registration cost performance in this network model is analyzed in detail. Furthermore, the functional relationship is also established in the paper among registration cost, hierarchical level number and the maximum handover time for gateway foreign agent regional registration. At last, the registration cost of the hierarchical mobile Internet protocol network is compared with that of the traditional mobile Internet protocol. Theoretic analysis and computer simulation results show that the hierarchical level number and the maximum handover times can both affect the registration cost importantly, when suitable values of which are chosen, the hierarchical network can significantly improve the registration performance compared with the traditional mobile IP.
