Pub Date : 2012-08-02DOI: 10.1109/ECTICON.2012.6254258
K. Sooksood, M. Ortmanns
In implantable stimulators, a current-controlled stimulation is preferred over a voltage-controlled due to its safety. However, the power efficiency is a major disadvantage. By reducing the headroom voltage needed in the current driver, power efficiency of a constant current stimulation is improved. A promising technique is to bias the transistor in triode region whereas improving output impedance through the regulated cascode structure. This comes with a feature of implicit compliance monitor. This paper presents an overview on recent highly compliance output drivers and proposes a new power efficient high compliance output stage.
{"title":"Power efficient output stages for high density implantable stimulators — Review and outlook","authors":"K. Sooksood, M. Ortmanns","doi":"10.1109/ECTICON.2012.6254258","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254258","url":null,"abstract":"In implantable stimulators, a current-controlled stimulation is preferred over a voltage-controlled due to its safety. However, the power efficiency is a major disadvantage. By reducing the headroom voltage needed in the current driver, power efficiency of a constant current stimulation is improved. A promising technique is to bias the transistor in triode region whereas improving output impedance through the regulated cascode structure. This comes with a feature of implicit compliance monitor. This paper presents an overview on recent highly compliance output drivers and proposes a new power efficient high compliance output stage.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"43 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80883101","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254133
A. Singhapan, K. Naito, K. Mori, P. Boonsrimuang, H. Kobayashi
In this paper, a new Doppler frequency spread estimation method based on the autocorrelation function of the estimated channel impulse response is proposed for OFDM systems in the time-varying channel. We propose a technique to separate the Doppler frequency spread in both slow and fast modes that correspond to vehicle speed. The feature of proposed method is to achieve the accurate Doppler frequency spread estimation in the low mode based on comparing and approximating the ideal autocorrelation function value with the estimated autocorrelation function at the same time index. In the fast mode, we apply the conventional Doppler frequency spread estimation based on the zero-crossing of the autocorrelation function. This paper presents various computer simulation results to verify the effectiveness of proposed Doppler frequency spread estimation method in the both of slow and fast mode condition.
{"title":"Doppler frequency spread estimation for OFDM systems in time-varying fading channel","authors":"A. Singhapan, K. Naito, K. Mori, P. Boonsrimuang, H. Kobayashi","doi":"10.1109/ECTICON.2012.6254133","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254133","url":null,"abstract":"In this paper, a new Doppler frequency spread estimation method based on the autocorrelation function of the estimated channel impulse response is proposed for OFDM systems in the time-varying channel. We propose a technique to separate the Doppler frequency spread in both slow and fast modes that correspond to vehicle speed. The feature of proposed method is to achieve the accurate Doppler frequency spread estimation in the low mode based on comparing and approximating the ideal autocorrelation function value with the estimated autocorrelation function at the same time index. In the fast mode, we apply the conventional Doppler frequency spread estimation based on the zero-crossing of the autocorrelation function. This paper presents various computer simulation results to verify the effectiveness of proposed Doppler frequency spread estimation method in the both of slow and fast mode condition.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"11 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73742604","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254279
S. Rodporn, D. Uthitsunthorn, T. Kulworawanichpong, R. Oonsivilai, A. Oonsivilai
In this paper, the study of optimal coordination of directional over-current relays is proposed. The relay coordination problem is non-linear. It typically consists of two groups of control variables (Time Dial Setting: TDS and Plug Setting: PS). The objective function used is the operation time of the main relay in all considered fault cases. The differential evolution (DE) is employed to solve for solutions of optimal relay coordination. It is a stochastic model based on finding the answer from some random method. This algorithm was originally developed from Genetic Algorithm (GA), but the structure is simpler. A 9-bus test system was employed as the test system. The results showed that the DE can find the best solution for optimal relay coordination problems when comparing with those of GA and BFGS.
{"title":"Optimal coordination of over-current relays using differential evolution","authors":"S. Rodporn, D. Uthitsunthorn, T. Kulworawanichpong, R. Oonsivilai, A. Oonsivilai","doi":"10.1109/ECTICON.2012.6254279","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254279","url":null,"abstract":"In this paper, the study of optimal coordination of directional over-current relays is proposed. The relay coordination problem is non-linear. It typically consists of two groups of control variables (Time Dial Setting: TDS and Plug Setting: PS). The objective function used is the operation time of the main relay in all considered fault cases. The differential evolution (DE) is employed to solve for solutions of optimal relay coordination. It is a stochastic model based on finding the answer from some random method. This algorithm was originally developed from Genetic Algorithm (GA), but the structure is simpler. A 9-bus test system was employed as the test system. The results showed that the DE can find the best solution for optimal relay coordination problems when comparing with those of GA and BFGS.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"8 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75797426","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254172
A. Innok, P. Uthansakul, M. Uthansakul
For MIMO beamforming, the Eigen Beamforming (EB) technique provides the best performance with the expense of knowing full channel information. To reduce such an expense, the Quantized Beamforming (QB) has been presented by using only some feedback bits to calculate the suitable beamforming vectors. However, QB has a drawback in the complexity of finding the beamforming vectors and it is more difficult for a lot of feedback bits. In this paper, the new technique named as Angular Beamforming (AB) has been presented to overcome such a drawback of QB. The investigations are undertaken by sending multiple data streams into 4x4 MIMO system. The effect of different data streams and number of feedback bits are studied. The simulation results indicate that AB technique performs very well and its performance is as good as QB.
{"title":"Angular beamforming technique for MIMO beamforming system","authors":"A. Innok, P. Uthansakul, M. Uthansakul","doi":"10.1109/ECTICON.2012.6254172","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254172","url":null,"abstract":"For MIMO beamforming, the Eigen Beamforming (EB) technique provides the best performance with the expense of knowing full channel information. To reduce such an expense, the Quantized Beamforming (QB) has been presented by using only some feedback bits to calculate the suitable beamforming vectors. However, QB has a drawback in the complexity of finding the beamforming vectors and it is more difficult for a lot of feedback bits. In this paper, the new technique named as Angular Beamforming (AB) has been presented to overcome such a drawback of QB. The investigations are undertaken by sending multiple data streams into 4x4 MIMO system. The effect of different data streams and number of feedback bits are studied. The simulation results indicate that AB technique performs very well and its performance is as good as QB.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"23 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73711009","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254233
S. Buachan, T. Kasetkasem, S. Marukatat, H. Kunieda
Contour-based background subtraction algorithms are always focusing on the edge of objects in the scene. Most of them may fail when an initial contour is accidentally located inside the foreground object. From the fact that background and foreground image are usually independent to each other, we introduce a contour-based background subtraction algorithm which minimize the dependency between them. Not only guiding contour out to cover foreground object when the predicted contour is accidentally located in the foreground object, the algorithm can be run along the video frames without human labor required by predicting initial contour from the dependency between foreground and background.
{"title":"A probabilistic approach for an active contour-based background subtraction","authors":"S. Buachan, T. Kasetkasem, S. Marukatat, H. Kunieda","doi":"10.1109/ECTICON.2012.6254233","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254233","url":null,"abstract":"Contour-based background subtraction algorithms are always focusing on the edge of objects in the scene. Most of them may fail when an initial contour is accidentally located inside the foreground object. From the fact that background and foreground image are usually independent to each other, we introduce a contour-based background subtraction algorithm which minimize the dependency between them. Not only guiding contour out to cover foreground object when the predicted contour is accidentally located in the foreground object, the algorithm can be run along the video frames without human labor required by predicting initial contour from the dependency between foreground and background.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"3 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74248847","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254122
P. Kittisuwan
This paper is concerned with wavelet-based image denoising using Bayesian technique. In conventional denoising process, The parameters of probability density function (PDF) are usually calculated from the first few moments, mean and variance. In this work, a new image denoising algorithm based on Pearson Type IV random vectors is proposed. Pearson Type IV is used because it allows higher-order moments (skewness and kurtosis) to be incorporated into the noiseless wavelet coefficients' probabilistic model. One of the cruxes of the Bayesian image denoising methods is to estimate statistical parameters for a shrinkage function. We employ maximum a posterior (MAP) estimation to calculate local variances with Gamma density prior for local observed variances and Gaussian distribution for noisy wavelet coefficients. The experimental results show that the proposed method yields good denoising results.
{"title":"MAP estimation of Pearson Type IV random vectors in AWGN","authors":"P. Kittisuwan","doi":"10.1109/ECTICON.2012.6254122","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254122","url":null,"abstract":"This paper is concerned with wavelet-based image denoising using Bayesian technique. In conventional denoising process, The parameters of probability density function (PDF) are usually calculated from the first few moments, mean and variance. In this work, a new image denoising algorithm based on Pearson Type IV random vectors is proposed. Pearson Type IV is used because it allows higher-order moments (skewness and kurtosis) to be incorporated into the noiseless wavelet coefficients' probabilistic model. One of the cruxes of the Bayesian image denoising methods is to estimate statistical parameters for a shrinkage function. We employ maximum a posterior (MAP) estimation to calculate local variances with Gamma density prior for local observed variances and Gaussian distribution for noisy wavelet coefficients. The experimental results show that the proposed method yields good denoising results.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"5 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72749003","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254323
S. Somwong, S. Julrat, M. Chongcheawchamnan
Effect of additive white Gaussian noise on accuracy performance of a six-port reflectometer (SPR) is presented in this paper. Three six-port circuits (sampling line, five-port ring and ideal design) calibrated with different calibration techniques (five and seven standard loads based) are investigated. Mathematical model of a SPR is developed and simulated. To evaluate the accuracy performance of a SPR at a certain signal-to-noise ratio, a mean absolute error is computed from mean distance between exact and predicted reflection coefficients for all possible passive loads. Validity of this work is proven with some experimental results at 1 GHz SPRs.
{"title":"Effect of additive white Gaussian noise on accuracy of a six-port reflectometer","authors":"S. Somwong, S. Julrat, M. Chongcheawchamnan","doi":"10.1109/ECTICON.2012.6254323","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254323","url":null,"abstract":"Effect of additive white Gaussian noise on accuracy performance of a six-port reflectometer (SPR) is presented in this paper. Three six-port circuits (sampling line, five-port ring and ideal design) calibrated with different calibration techniques (five and seven standard loads based) are investigated. Mathematical model of a SPR is developed and simulated. To evaluate the accuracy performance of a SPR at a certain signal-to-noise ratio, a mean absolute error is computed from mean distance between exact and predicted reflection coefficients for all possible passive loads. Validity of this work is proven with some experimental results at 1 GHz SPRs.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"49 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74595641","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254201
K. Prachumrasee, A. Kaewrawang, V. Prasertchoreonsuk, A. Siritaratiwat, A. Kuesubthawon
As the data rate continuous increasing, in order to avoid signal reflection between a magnetic recording head and a read/write driver on hard disk drive interconnects (HDDIs), a practical approach, windowing, used to keep low insertion loss causes the higher crosstalk between lines. In this work, the crosstalk on idealized HDDI with percent variation of windowing is investigated. The crosstalk based on the scattering parameters is calculated by using the full wave simulation software. From the result, it is found that both of the crosstalk and the characteristic impedance increase with the increasing window percentage, while the insertion loss increased. However, the increasing window pitch of 50% windowed TSAI to 8 mm can suppress the crosstalk up to 11 dB and 39 dB at low and high frequency regions, respectively when compared with the conventional TSAI.
{"title":"Crosstalk on high speed hard disk drive interconnect with percent variation of windowing","authors":"K. Prachumrasee, A. Kaewrawang, V. Prasertchoreonsuk, A. Siritaratiwat, A. Kuesubthawon","doi":"10.1109/ECTICON.2012.6254201","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254201","url":null,"abstract":"As the data rate continuous increasing, in order to avoid signal reflection between a magnetic recording head and a read/write driver on hard disk drive interconnects (HDDIs), a practical approach, windowing, used to keep low insertion loss causes the higher crosstalk between lines. In this work, the crosstalk on idealized HDDI with percent variation of windowing is investigated. The crosstalk based on the scattering parameters is calculated by using the full wave simulation software. From the result, it is found that both of the crosstalk and the characteristic impedance increase with the increasing window percentage, while the insertion loss increased. However, the increasing window pitch of 50% windowed TSAI to 8 mm can suppress the crosstalk up to 11 dB and 39 dB at low and high frequency regions, respectively when compared with the conventional TSAI.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"9 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81888623","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254350
P. M. Meshram, V. Borghate
The proposed balancing method [10] of sub-module capacitor voltage of modular multilevel converter (MMC) in this paper is applied to one of the applications, HVDC power transmission i.e. MMC-VSC-HVDC. One of the control strategies of MMC-VSC-HVDC i.e. direct control strategy has been comprehensively simulated to prove the effectiveness and versatility of balancing method. To prove the robustness of the balancing method, the variation of the parameters such as active and reactive power is made to around 0.5pu on positive as well as negative sides. The simulation is done in MATLAB software.
{"title":"A voltage balancing method applied to direct control strategy of MMC-VSC-HVDC","authors":"P. M. Meshram, V. Borghate","doi":"10.1109/ECTICON.2012.6254350","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254350","url":null,"abstract":"The proposed balancing method [10] of sub-module capacitor voltage of modular multilevel converter (MMC) in this paper is applied to one of the applications, HVDC power transmission i.e. MMC-VSC-HVDC. One of the control strategies of MMC-VSC-HVDC i.e. direct control strategy has been comprehensively simulated to prove the effectiveness and versatility of balancing method. To prove the robustness of the balancing method, the variation of the parameters such as active and reactive power is made to around 0.5pu on positive as well as negative sides. The simulation is done in MATLAB software.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"12 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84319449","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 : 2012-05-16DOI: 10.1109/ECTICON.2012.6254278
P. Ratanaworabhan
This paper presents the design and construction of a light-weight execution-driven cache simulator for multicore CPU. We implement the simulator as a Pin tool, running on top of Pin, a dynamic instrumentation tool developed by Intel. We then use it to study the cache behavior of 13 multithreaded programs selected from the two well-recognized benchmark suites, SPLASH2 and PARSEC. We plan to release the tool as open-source software and hope that the computer architecture research community would benefit from it.
{"title":"Functional cache simulator for multicore","authors":"P. Ratanaworabhan","doi":"10.1109/ECTICON.2012.6254278","DOIUrl":"https://doi.org/10.1109/ECTICON.2012.6254278","url":null,"abstract":"This paper presents the design and construction of a light-weight execution-driven cache simulator for multicore CPU. We implement the simulator as a Pin tool, running on top of Pin, a dynamic instrumentation tool developed by Intel. We then use it to study the cache behavior of 13 multithreaded programs selected from the two well-recognized benchmark suites, SPLASH2 and PARSEC. We plan to release the tool as open-source software and hope that the computer architecture research community would benefit from it.","PeriodicalId":6319,"journal":{"name":"2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology","volume":"62 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81184173","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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