Pub Date : 2014-12-01DOI: 10.1109/ICECE.2014.7026899
M. A. Islam, Ashraful Bari Chowdhury
Free-space optical (FSO) communication offers highly directional, high bandwidth communication channels, which is why it is often used in digital communication systems. However, atmospheric turbulence has a voluminous degradation in the performance of FSO communication system. Therefore, different modulation techniques are introduced to improve the performance of the FSO communication systems. In this paper, the modulation schemes considered for the proposed FSO system, are binary pulse position modulation (BPPM) and M-ary pulse position modulation (M-ary PPM). The channel fading is characterized using gamma-gamma distribution. APD and PIN photodiode are used as photodetectors. Performance of the FSO systems has been compared in terms of their bit error rates (BERs). The results obtained in the paper show the suitability of BPPM over M-ary PPM for both photodetectors and also indicate the suitability of APD over PIN photodiode for the considered modulation techniques.
{"title":"Performance analysis of BPPM and M-ary PPM in free-space optical communication systems under gamma-gamma distribution using APD and PIN","authors":"M. A. Islam, Ashraful Bari Chowdhury","doi":"10.1109/ICECE.2014.7026899","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026899","url":null,"abstract":"Free-space optical (FSO) communication offers highly directional, high bandwidth communication channels, which is why it is often used in digital communication systems. However, atmospheric turbulence has a voluminous degradation in the performance of FSO communication system. Therefore, different modulation techniques are introduced to improve the performance of the FSO communication systems. In this paper, the modulation schemes considered for the proposed FSO system, are binary pulse position modulation (BPPM) and M-ary pulse position modulation (M-ary PPM). The channel fading is characterized using gamma-gamma distribution. APD and PIN photodiode are used as photodetectors. Performance of the FSO systems has been compared in terms of their bit error rates (BERs). The results obtained in the paper show the suitability of BPPM over M-ary PPM for both photodetectors and also indicate the suitability of APD over PIN photodiode for the considered modulation techniques.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131920189","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 : 2014-12-01DOI: 10.1109/ICECE.2014.7026908
A. Maruf, M. A. Haque
Ideal acoustic multichannel equalization technique based on multiple-input/output inverse theorem (MINT) aims to completely invert the estimated room impulse responses (RIRs) between the source and microphone arrays. However, the method is known to be very sensitive to the estimation errors of the RIRs. In order to increase robustness, regularized MINT (R-MINT) has been proposed that overcomes the limitation by decreasing the energy of the equalization filters. In this paper, we analyze the solution of the R-MINT method and introduce a number of different ways to increase the robustness of the MINT method. Recently, regularized partial MINT (RP-MINT) method has been proposed that provides better perceptual speech quality compare to the R-MINT method. We also propose a new regularized optimal partial MINT (ROP-MINT) method which aims to optimize the equalized impulse response (EIR) between the source and output of the system. Simulation experiments conducted in various reverberant environments demonstrate that performance of our proposed ROP-MINT is better than that of the RP-MINT method.
{"title":"Optimal multichannel equalization for robust speech dereverberation","authors":"A. Maruf, M. A. Haque","doi":"10.1109/ICECE.2014.7026908","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026908","url":null,"abstract":"Ideal acoustic multichannel equalization technique based on multiple-input/output inverse theorem (MINT) aims to completely invert the estimated room impulse responses (RIRs) between the source and microphone arrays. However, the method is known to be very sensitive to the estimation errors of the RIRs. In order to increase robustness, regularized MINT (R-MINT) has been proposed that overcomes the limitation by decreasing the energy of the equalization filters. In this paper, we analyze the solution of the R-MINT method and introduce a number of different ways to increase the robustness of the MINT method. Recently, regularized partial MINT (RP-MINT) method has been proposed that provides better perceptual speech quality compare to the R-MINT method. We also propose a new regularized optimal partial MINT (ROP-MINT) method which aims to optimize the equalized impulse response (EIR) between the source and output of the system. Simulation experiments conducted in various reverberant environments demonstrate that performance of our proposed ROP-MINT is better than that of the RP-MINT method.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133228813","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 : 2014-12-01DOI: 10.1109/ICECE.2014.7027029
Mohammed E. Ali
In this paper, a local phase correction method is proposed and demonstrated to effectively mitigate mode conversion in coupled transmission line bends leading to significant improvement in their high-speed performance. Signal loss and mode conversion improvements by more than 5 dB and 16 dB respectively at 50 GHz are reported for experimental prototypes. Good correlation has been established among analytical predictions, full-wave electromagnetic simulations and measurements.
{"title":"A local phase correction method to mitigate mode conversion in coupled transmission line bends","authors":"Mohammed E. Ali","doi":"10.1109/ICECE.2014.7027029","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7027029","url":null,"abstract":"In this paper, a local phase correction method is proposed and demonstrated to effectively mitigate mode conversion in coupled transmission line bends leading to significant improvement in their high-speed performance. Signal loss and mode conversion improvements by more than 5 dB and 16 dB respectively at 50 GHz are reported for experimental prototypes. Good correlation has been established among analytical predictions, full-wave electromagnetic simulations and measurements.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124163435","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 : 2014-12-01DOI: 10.1109/ICECE.2014.7026911
N. Akter, P. Paul, Sudipta Mondal, S. M. Mominuzzaman
The main objective of this paper is the modeling and analysis of inorganic homo-junction and inorganic-organic hybrid solar cells. For this, an independent model is developed that is capable of simulating the I-V characteristics of any homo-junction solar cell. The efficiency from the model is 14.897% at standard conditions and from PC1D, a commercial software the efficiency is 14.37% under the same conditions. Also hybrid series and hybrid parallel solar cells are modeled. The efficiency of the single inorganic cell is increased from 15% to 19.5% by the hybrid parallel connection.
{"title":"Modeling and analysis of inorganic, organic and hybrid solar cells","authors":"N. Akter, P. Paul, Sudipta Mondal, S. M. Mominuzzaman","doi":"10.1109/ICECE.2014.7026911","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026911","url":null,"abstract":"The main objective of this paper is the modeling and analysis of inorganic homo-junction and inorganic-organic hybrid solar cells. For this, an independent model is developed that is capable of simulating the I-V characteristics of any homo-junction solar cell. The efficiency from the model is 14.897% at standard conditions and from PC1D, a commercial software the efficiency is 14.37% under the same conditions. Also hybrid series and hybrid parallel solar cells are modeled. The efficiency of the single inorganic cell is increased from 15% to 19.5% by the hybrid parallel connection.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129295096","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 : 2014-12-01DOI: 10.1109/ICECE.2014.7026846
G. Orfanidis, N. Nikolaidis, A. Tefas, I. Pitas
In this work we proposed a new variant of spectral clustering using double spectral analysis which proved to be able to achieve better clustering results. The present work focuses on the special case of 3D videos and the implication of their use. Various improvements are introduced including the use of stereo over mono videos, the use of double spectral clustering over spectral clustering and the use of multiple representative images per trajectory for more robust trajectory representation. Extended experiments have been conducted in three 3D full feature commercial films which revealed the power of stereo face clustering in comparison with single channel face clustering.
{"title":"Stereo facial image clustering using double spectral analysis","authors":"G. Orfanidis, N. Nikolaidis, A. Tefas, I. Pitas","doi":"10.1109/ICECE.2014.7026846","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026846","url":null,"abstract":"In this work we proposed a new variant of spectral clustering using double spectral analysis which proved to be able to achieve better clustering results. The present work focuses on the special case of 3D videos and the implication of their use. Various improvements are introduced including the use of stereo over mono videos, the use of double spectral clustering over spectral clustering and the use of multiple representative images per trajectory for more robust trajectory representation. Extended experiments have been conducted in three 3D full feature commercial films which revealed the power of stereo face clustering in comparison with single channel face clustering.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128427511","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 : 2014-12-01DOI: 10.1109/ICECE.2014.7026966
M. H. Haque
Self-excited induction generators (SEIG) are increasingly being used in remote areas to energize isolated communities. The maximum power delivery capability of a SEIG depends on various factors, such as excitation capacitance, generator parameters, operating speed and load power factor. This paper proposes a simple method of determining the maximum power that can be delivered by a three-phase SEIG for various operating conditions. The maximum power of the generator is carefully formulated as a multi-variable constrained optimization problem. The problem is then solved using a numerical based routine “fmincon” given in the optimization toolbox of MATLAB. The effectiveness of the proposed method is then evaluated on a 1.5-kW, 220-V induction machine operated as a SEIG. The simulation results obtained by the proposed method are also compared with the corresponding experimental values.
{"title":"Maximum power delivery capability of a three-phase self-excited induction generator","authors":"M. H. Haque","doi":"10.1109/ICECE.2014.7026966","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026966","url":null,"abstract":"Self-excited induction generators (SEIG) are increasingly being used in remote areas to energize isolated communities. The maximum power delivery capability of a SEIG depends on various factors, such as excitation capacitance, generator parameters, operating speed and load power factor. This paper proposes a simple method of determining the maximum power that can be delivered by a three-phase SEIG for various operating conditions. The maximum power of the generator is carefully formulated as a multi-variable constrained optimization problem. The problem is then solved using a numerical based routine “fmincon” given in the optimization toolbox of MATLAB. The effectiveness of the proposed method is then evaluated on a 1.5-kW, 220-V induction machine operated as a SEIG. The simulation results obtained by the proposed method are also compared with the corresponding experimental values.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116345462","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 : 2014-12-01DOI: 10.1109/ICECE.2014.7026958
M A Awal, Zabir Ahmed, Muhammad Anisuzzaman Talukder
We propose and present a semi-analytical model to study the interaction between surface plasmon polaritons generated by phase-matching structures in corrugated dielectric/metal interfaces. The proposed semi-analytical model calculates surface plasmon polariton dynamics that agree well with that found from the full-field vectorial finite difference time domain (FDTD) simulations. The proposed model takes almost no computational time in comparison with FDTD simulations. Therefore, the proposed model can be used instead of FDTD simulations to design and engineer sub-wavelength structures to enhance light confinement. In particular, the proposed model can save significant amount of time to efficiently predict the optimal structural parameters to achieve resonant absorption in metal/dielectric interface of a thin-film solar cell.
{"title":"Semi-analytical model for enhanced surface plasmon polaritons in a corrugated interface","authors":"M A Awal, Zabir Ahmed, Muhammad Anisuzzaman Talukder","doi":"10.1109/ICECE.2014.7026958","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026958","url":null,"abstract":"We propose and present a semi-analytical model to study the interaction between surface plasmon polaritons generated by phase-matching structures in corrugated dielectric/metal interfaces. The proposed semi-analytical model calculates surface plasmon polariton dynamics that agree well with that found from the full-field vectorial finite difference time domain (FDTD) simulations. The proposed model takes almost no computational time in comparison with FDTD simulations. Therefore, the proposed model can be used instead of FDTD simulations to design and engineer sub-wavelength structures to enhance light confinement. In particular, the proposed model can save significant amount of time to efficiently predict the optimal structural parameters to achieve resonant absorption in metal/dielectric interface of a thin-film solar cell.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114555703","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 : 2014-12-01DOI: 10.1109/ICECE.2014.7026993
Golam Md. Muradul Bashir, Arpita Howlader, I. Shemu, E. Ety
The complexity of data requirement increasing day by day; therefore minimization of schema becomes an important role for equi distribution or equalization of two or more problems. Schema complexity is measured by transmitting schema to a graph with weight or weighted graph. Selected special fundamentals from schema for weight the schema graph are described as major part. Minimization of schema ensures easy to measure the schema complexity. Some consideration for this approaches are normalization and de-normalization. We also find the effect of normalization and de-normalization on minimization of schema of real life data model as well as synthetic data model. The purpose of this research is to examine the effectiveness of schema complexity based on schema minimization with weighted graph.
{"title":"Effectiveness of minimization and measurement of schema complexity based on weighted graph","authors":"Golam Md. Muradul Bashir, Arpita Howlader, I. Shemu, E. Ety","doi":"10.1109/ICECE.2014.7026993","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026993","url":null,"abstract":"The complexity of data requirement increasing day by day; therefore minimization of schema becomes an important role for equi distribution or equalization of two or more problems. Schema complexity is measured by transmitting schema to a graph with weight or weighted graph. Selected special fundamentals from schema for weight the schema graph are described as major part. Minimization of schema ensures easy to measure the schema complexity. Some consideration for this approaches are normalization and de-normalization. We also find the effect of normalization and de-normalization on minimization of schema of real life data model as well as synthetic data model. The purpose of this research is to examine the effectiveness of schema complexity based on schema minimization with weighted graph.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"580 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115278923","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 : 2014-12-01DOI: 10.1109/ICECE.2014.7026869
Sohana Tanzeem, W. Reddick, K. Iftekharuddin
The focus of this work was to develop a 3D mapping of brain tumor (glioma) growth based on cell proliferation and diffusion. In this mathematical model, we incorporated high resolution brain tissue maps (white and gray matter) from an anonymized pediatric patient and initialized the model with a single voxel seed point of tumor with a Gaussian distribution. We used this model to investigate the ratio of growth rate to the diffusion coefficient (ρ/D) which determines the proportion of tumor that is detectable. After expansion of the tumor growth model to three dimensions and solving the differential equations for our specific starting conditions, we performed several simulations to assess tumor growth patterns. After observing the performance of the model at varying time points across a one year time frame with different values for ρ/D, we ascertained that the tumor diffused more rapidly than the cell proliferated for a short period of time followed by an exponential growth in detectable tumor size.
{"title":"3D quantitative brain tumor growth model based on cell proliferation and diffusion","authors":"Sohana Tanzeem, W. Reddick, K. Iftekharuddin","doi":"10.1109/ICECE.2014.7026869","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026869","url":null,"abstract":"The focus of this work was to develop a 3D mapping of brain tumor (glioma) growth based on cell proliferation and diffusion. In this mathematical model, we incorporated high resolution brain tissue maps (white and gray matter) from an anonymized pediatric patient and initialized the model with a single voxel seed point of tumor with a Gaussian distribution. We used this model to investigate the ratio of growth rate to the diffusion coefficient (ρ/D) which determines the proportion of tumor that is detectable. After expansion of the tumor growth model to three dimensions and solving the differential equations for our specific starting conditions, we performed several simulations to assess tumor growth patterns. After observing the performance of the model at varying time points across a one year time frame with different values for ρ/D, we ascertained that the tumor diffused more rapidly than the cell proliferated for a short period of time followed by an exponential growth in detectable tumor size.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114378063","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 : 2014-12-01DOI: 10.1109/ICECE.2014.7026829
S. K. Ahamed, A. Sarkar, M. Mitra, S. Sengupta
In this paper, a new approach for detection of inter-turn short in the stator winding of an induction motor is presented. Discrete Wavelet Transform using DB4 is performed on the envelopes of the windowed steady-state current signatures. The envelopes are determined by applying Hilbert Transform. Low frequency oscillations below 50 Hz were extracted from the reconstructed details at higher wavelet levels. As the envelope works on narrow band frequencies or mono-component signal, it was analyzed using higher wavelet levels which belong to the narrow band harmonics. The RMS and Mean values of the reconstructed details and Power Detail Energy defined as PDE were used as fault parameters to detect the faulty motor from the healthy one. It has been observed that the faulty motor produces higher fault parameters than the healthy one. Laboratory test results confirm the validity of the proposed method.
{"title":"Novel approach for detection of inter-turn short circuit of induction motor's stator winding through envelope analysis","authors":"S. K. Ahamed, A. Sarkar, M. Mitra, S. Sengupta","doi":"10.1109/ICECE.2014.7026829","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026829","url":null,"abstract":"In this paper, a new approach for detection of inter-turn short in the stator winding of an induction motor is presented. Discrete Wavelet Transform using DB4 is performed on the envelopes of the windowed steady-state current signatures. The envelopes are determined by applying Hilbert Transform. Low frequency oscillations below 50 Hz were extracted from the reconstructed details at higher wavelet levels. As the envelope works on narrow band frequencies or mono-component signal, it was analyzed using higher wavelet levels which belong to the narrow band harmonics. The RMS and Mean values of the reconstructed details and Power Detail Energy defined as PDE were used as fault parameters to detect the faulty motor from the healthy one. It has been observed that the faulty motor produces higher fault parameters than the healthy one. Laboratory test results confirm the validity of the proposed method.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126652324","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：