Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368614
Hong-xin Zhang, Gan Han, Jing Li
In the attack of the encryption algorithm ARCFOUR(RC4), new method of machine learning based on Wavelet Transform(WT) and Principal Component Analysis(PCA)is proposed. WT is used to reconstruct the new signals to extract information from the original signals effectively. Components in low and high frequency and reconstructed signals are made by WT. In order to analyze the impact of the signals on the success rate of prediction, four kinds of signals are adapted respectively for dimensionality reduction, which contains initial signals, reconstructed signals, and the signals in low and high frequency. By the classification of Support Vector Machine (SVM), the results show that the effect of the reconstructed signals is the best one. The reconstructed signals reduce the noise influence. In the range of 500 dimensions, the classification effect of the reconstructed signals is obviously better than others. As the dimension increases, the effect becomes small. The effect of signals in low frequency is more effective than that of the original in most of dimensions. The classification success rate is still high with fewer dimensions. In the four kinds of signals, the effect of the signals in high frequency is the worst. The results show that WT combined with PCA is a good method to handle with classification.
{"title":"Wavelet Transform-principal component analysis in electromagnetic attack","authors":"Hong-xin Zhang, Gan Han, Jing Li","doi":"10.1109/CEEM.2015.7368614","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368614","url":null,"abstract":"In the attack of the encryption algorithm ARCFOUR(RC4), new method of machine learning based on Wavelet Transform(WT) and Principal Component Analysis(PCA)is proposed. WT is used to reconstruct the new signals to extract information from the original signals effectively. Components in low and high frequency and reconstructed signals are made by WT. In order to analyze the impact of the signals on the success rate of prediction, four kinds of signals are adapted respectively for dimensionality reduction, which contains initial signals, reconstructed signals, and the signals in low and high frequency. By the classification of Support Vector Machine (SVM), the results show that the effect of the reconstructed signals is the best one. The reconstructed signals reduce the noise influence. In the range of 500 dimensions, the classification effect of the reconstructed signals is obviously better than others. As the dimension increases, the effect becomes small. The effect of signals in low frequency is more effective than that of the original in most of dimensions. The classification success rate is still high with fewer dimensions. In the four kinds of signals, the effect of the signals in high frequency is the worst. The results show that WT combined with PCA is a good method to handle with classification.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129949743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368699
Yuanxing Chen, Shi Dan, Gao You-gang
Generally speaking, the intersection point between the ray and the terrain can be judged in the simulation software adopting the method of ray tracing, and then where the ray is intersected, reflected or diffracted with the specific terrain can be judged. At present, most terrains are simulated in the form of triangular facet, while the judgment process for one time of intersection between one ray with all triangular facets of a large terrain is relatively long. In this paper, the ray path can be estimated during the process of judging the intersection and confirming the position of the intersection point as per the ray and the terrain, the intersection judgment can be reduced, it can be accelerated, and consequently the time for ray tracing is largely shortened and the efficiency of the software simulation can be improved.
{"title":"Research on acceleration algorithm of common terrain in ray tracing","authors":"Yuanxing Chen, Shi Dan, Gao You-gang","doi":"10.1109/CEEM.2015.7368699","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368699","url":null,"abstract":"Generally speaking, the intersection point between the ray and the terrain can be judged in the simulation software adopting the method of ray tracing, and then where the ray is intersected, reflected or diffracted with the specific terrain can be judged. At present, most terrains are simulated in the form of triangular facet, while the judgment process for one time of intersection between one ray with all triangular facets of a large terrain is relatively long. In this paper, the ray path can be estimated during the process of judging the intersection and confirming the position of the intersection point as per the ray and the terrain, the intersection judgment can be reduced, it can be accelerated, and consequently the time for ray tracing is largely shortened and the efficiency of the software simulation can be improved.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"288 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126020868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368675
Yang Jing, Sun Beiyun, Zhu Zhizhen, Shi Yuewu
The polarization and incident angle of the incident plane wave influence the electromagnetic shielding effectiveness (EMSE). By calculating the attenuated field of an infinite metal plate immediately from Maxwell's Equations or using the model of transmission line, EMSE versus the incident angle for different polarizations can be plotted. EMSE increases as the incident angle getting larger for perpendicular polarized incident wave and it decreases with the incident angle for parallel polarized incident wave. For frequently used shielding materials, the deviation between normal incidence and different polarized incident wave is approximately a constant for a given incident angle in the range of a widen frequency spectrum (1 Hz~1 GHz).
{"title":"Shielding effectiveness of infinite metal plate with finite thickness at oblique incident and arbitrary polarizations","authors":"Yang Jing, Sun Beiyun, Zhu Zhizhen, Shi Yuewu","doi":"10.1109/CEEM.2015.7368675","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368675","url":null,"abstract":"The polarization and incident angle of the incident plane wave influence the electromagnetic shielding effectiveness (EMSE). By calculating the attenuated field of an infinite metal plate immediately from Maxwell's Equations or using the model of transmission line, EMSE versus the incident angle for different polarizations can be plotted. EMSE increases as the incident angle getting larger for perpendicular polarized incident wave and it decreases with the incident angle for parallel polarized incident wave. For frequently used shielding materials, the deviation between normal incidence and different polarized incident wave is approximately a constant for a given incident angle in the range of a widen frequency spectrum (1 Hz~1 GHz).","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114245110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368677
Shuhua Wen, Jinling Zhang, Yinghua Lv
TEM cell can be used to test radiated emission and immunity of integrated circuits (ICs).The impedance mismatch of septum will cause voltage standing wave ratio (VSWR) improved and transmission performance deteriorated. This paper investigates several methods for locating the connection point between main part and transition part of septum in TEM cell to get perfect electric and magnetic fields distribution. The three-dimensional model of TEM cell with different connection point location has been established in order to analysis the mode of electromagnetic wave and transmission characteristics. The field distribution of optimized TEM cell will become more uniform and the maximum VSWR can reduce from 1.38 to 1.20 in whole working bandwidth.
{"title":"The optimization design of septum in TEM cells for IC EMC Measurement","authors":"Shuhua Wen, Jinling Zhang, Yinghua Lv","doi":"10.1109/CEEM.2015.7368677","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368677","url":null,"abstract":"TEM cell can be used to test radiated emission and immunity of integrated circuits (ICs).The impedance mismatch of septum will cause voltage standing wave ratio (VSWR) improved and transmission performance deteriorated. This paper investigates several methods for locating the connection point between main part and transition part of septum in TEM cell to get perfect electric and magnetic fields distribution. The three-dimensional model of TEM cell with different connection point location has been established in order to analysis the mode of electromagnetic wave and transmission characteristics. The field distribution of optimized TEM cell will become more uniform and the maximum VSWR can reduce from 1.38 to 1.20 in whole working bandwidth.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"42 Suppl 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121021109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368637
Yaoyao Li, D. Su, Yan Liu, Zhao Yang
HEMP couplings characteristics for typical aircraft antenna are researched by experiment method. Firstly, the field uniformity and accuracy of experimental simulator are verified by numerical and experiment method. Then, the responses of monopole antenna, dipole antenna, blade antenna, GPS antenna under HEMP radiation environment are measured respectively. The measurement results are analyzed by the Short-Time-Fourier transform, and it is show that the transient response characteristics of the antenna are depended on the size of antenna and the impedance characteristics of less than 200MHz. Finally an antenna equivalent calculation method is performed to verify this characteristic.
{"title":"The experimental study on the effect of HEMP on the typical aircraft antenna","authors":"Yaoyao Li, D. Su, Yan Liu, Zhao Yang","doi":"10.1109/CEEM.2015.7368637","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368637","url":null,"abstract":"HEMP couplings characteristics for typical aircraft antenna are researched by experiment method. Firstly, the field uniformity and accuracy of experimental simulator are verified by numerical and experiment method. Then, the responses of monopole antenna, dipole antenna, blade antenna, GPS antenna under HEMP radiation environment are measured respectively. The measurement results are analyzed by the Short-Time-Fourier transform, and it is show that the transient response characteristics of the antenna are depended on the size of antenna and the impedance characteristics of less than 200MHz. Finally an antenna equivalent calculation method is performed to verify this characteristic.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132593249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368714
H. Xiaofeng, Zhang Yue, Wang Lei, Liu Hao
As an important gas discharge form, corona discharge can generate electromagnetic radiation field which will interfere with the electronic devices and systems. Calculation of electromagnetic radiation field requires quantitative research of corona pulse current and analytical expression. According to the research situation abroad that the corona current was fitted using double-exponential function and Gaussian function, a corona pulse current function is proposed in the paper. It is researched based on the physical processes of corona discharge current excitation. And the fitting parameters and analytic of -60 kV negative corona discharge current are deduced based on the measurement data and compared with the double-exponential fitting result. The result shows that time derivative at zero time of fitting expression corona current pulse function is zero. And the waveform frontier is consistent with the measured waveform, which is better than double-exponential function. The proposed fitting method is suitable for describing the corona discharge pulse current waveform.
{"title":"Method of pulse function fitting based on the corona current measurement data","authors":"H. Xiaofeng, Zhang Yue, Wang Lei, Liu Hao","doi":"10.1109/CEEM.2015.7368714","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368714","url":null,"abstract":"As an important gas discharge form, corona discharge can generate electromagnetic radiation field which will interfere with the electronic devices and systems. Calculation of electromagnetic radiation field requires quantitative research of corona pulse current and analytical expression. According to the research situation abroad that the corona current was fitted using double-exponential function and Gaussian function, a corona pulse current function is proposed in the paper. It is researched based on the physical processes of corona discharge current excitation. And the fitting parameters and analytic of -60 kV negative corona discharge current are deduced based on the measurement data and compared with the double-exponential fitting result. The result shows that time derivative at zero time of fitting expression corona current pulse function is zero. And the waveform frontier is consistent with the measured waveform, which is better than double-exponential function. The proposed fitting method is suitable for describing the corona discharge pulse current waveform.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114795701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368684
Zhou Yinghui, Shi Lihua, Duan Mingxin
Bulk current injection (BCI) research has been done to complicated cable with ferromagnetic shielding layer. The nonlinear effect of shields has been investigated experimentally based on the built test system. Pulse current with different values have been injected to test the characteristic of two types of shielded cables. Test result show the nonlinear characteristic of transfer impedance obviously when the peak of injected current reach to certain levels. This feature is important to increase the protection ability of shielded cable against strong electromagnetic interference.
{"title":"Nonlinear characteristic of complicated shielded cable transfer impedance","authors":"Zhou Yinghui, Shi Lihua, Duan Mingxin","doi":"10.1109/CEEM.2015.7368684","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368684","url":null,"abstract":"Bulk current injection (BCI) research has been done to complicated cable with ferromagnetic shielding layer. The nonlinear effect of shields has been investigated experimentally based on the built test system. Pulse current with different values have been injected to test the characteristic of two types of shielded cables. Test result show the nonlinear characteristic of transfer impedance obviously when the peak of injected current reach to certain levels. This feature is important to increase the protection ability of shielded cable against strong electromagnetic interference.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116274763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368702
Zhongkai Li, D. Shi, Yougang Gao
This paper analyzes the process of calculating electromagnetic situation which uses traditional ray tracing algorithm, then makes improvements, establishes a calculation model of 3D posture, and analyzes the accuracy and efficiency, put forwards a method that can direct and reflection calculate respectively and store intermediate results in previous which can improve efficiency and accuracy of the calculation.
{"title":"An aceleration agorithm of calculating electromagnetic situation based on ray tracing","authors":"Zhongkai Li, D. Shi, Yougang Gao","doi":"10.1109/CEEM.2015.7368702","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368702","url":null,"abstract":"This paper analyzes the process of calculating electromagnetic situation which uses traditional ray tracing algorithm, then makes improvements, establishes a calculation model of 3D posture, and analyzes the accuracy and efficiency, put forwards a method that can direct and reflection calculate respectively and store intermediate results in previous which can improve efficiency and accuracy of the calculation.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115018062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368706
Mingxin Du, Ying-hui Zhou, Li-hua Shi, Liang Chen
Numerical simulation method is a simple but effective method in the study of the damage behavior of carbon fiber reinforced polymer (CFRP) caused by lightning strike. A method to evaluate the internal damage area of CFRP is developed in this paper by superposing the temperature field of each layer, and damage effects of two kinds of CFRPs caused by different types of lightning currents are investigated based on finite element method. The results show that action integral has a great affection on damage results, and the types of the lightning currents may slightly influence the propagation of the temperature along the thickness direction. Internal damage area will keep equal when the action integral of the lightning currents is the same.
{"title":"Study of action integral affecting the direct effects of lightning strike on CFRP","authors":"Mingxin Du, Ying-hui Zhou, Li-hua Shi, Liang Chen","doi":"10.1109/CEEM.2015.7368706","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368706","url":null,"abstract":"Numerical simulation method is a simple but effective method in the study of the damage behavior of carbon fiber reinforced polymer (CFRP) caused by lightning strike. A method to evaluate the internal damage area of CFRP is developed in this paper by superposing the temperature field of each layer, and damage effects of two kinds of CFRPs caused by different types of lightning currents are investigated based on finite element method. The results show that action integral has a great affection on damage results, and the types of the lightning currents may slightly influence the propagation of the temperature along the thickness direction. Internal damage area will keep equal when the action integral of the lightning currents is the same.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124816423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/CEEM.2015.7368713
Tao Wang, Li-hua Shi, Fei Guo
In this paper, a three dimensions (3D) numerical simulation model to analyze time reversal applications in lightning location is presented. In this simulation model, more practical situation is considered, and a square array which consists of four monopole antennas is set. The simulation shows that the time reversed fields will converge on the lightning strike location in phase at proper time step. But when a special situation is considered that the lightning location is beside the sensor array, it is hard to observe the exact time accurately because there will always be a convergence point appearing at every time step. In this paper, it is unnecessary to estimate “the proper time”. What we have to do is to add an array. And then, track the different locating paths of the these arrays to the lightning location. The intersection of these paths is the location point. Considering different situations, it is better to set three arrays to ensure the lightning discharge is located successfully, and make the arrays not on the same line. With the results of this simulation model being presented, the time-reversed technique is shown to be accurate.
{"title":"Lightning location with time reversal of electromagnetic fields technique","authors":"Tao Wang, Li-hua Shi, Fei Guo","doi":"10.1109/CEEM.2015.7368713","DOIUrl":"https://doi.org/10.1109/CEEM.2015.7368713","url":null,"abstract":"In this paper, a three dimensions (3D) numerical simulation model to analyze time reversal applications in lightning location is presented. In this simulation model, more practical situation is considered, and a square array which consists of four monopole antennas is set. The simulation shows that the time reversed fields will converge on the lightning strike location in phase at proper time step. But when a special situation is considered that the lightning location is beside the sensor array, it is hard to observe the exact time accurately because there will always be a convergence point appearing at every time step. In this paper, it is unnecessary to estimate “the proper time”. What we have to do is to add an array. And then, track the different locating paths of the these arrays to the lightning location. The intersection of these paths is the location point. Considering different situations, it is better to set three arrays to ensure the lightning discharge is located successfully, and make the arrays not on the same line. With the results of this simulation model being presented, the time-reversed technique is shown to be accurate.","PeriodicalId":442379,"journal":{"name":"2015 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123612235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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