Pub Date : 2007-03-22DOI: 10.1109/SECON.2007.342911
G. Athalye, V. Dronamraju, J. Conrad
This paper presents the design and development of a daughter board consisting of stepper motor drivers and serial interfaces. The purpose of this board is to provide embedded systems students with a tool to design and develop automation applications using stepper motors and simple RS-232C serial communications. The stepper motors used is a bipolar six-wire configuration motor. Software drivers for serial communication and the stepper motors are written in the 'C' language using the High-performance Embedded Workshop (HEW) Integrated Development Environment provided with the Renesas Embedded Evaluation Board. The stepper motors are programmed to drive in full step, half step, and micro step mode. The circuit functionality was tested on a breadboard, and on compliance with the performance, a PCB was manufactured.
{"title":"A stepper motor and serial communication interface daughter board for educational use","authors":"G. Athalye, V. Dronamraju, J. Conrad","doi":"10.1109/SECON.2007.342911","DOIUrl":"https://doi.org/10.1109/SECON.2007.342911","url":null,"abstract":"This paper presents the design and development of a daughter board consisting of stepper motor drivers and serial interfaces. The purpose of this board is to provide embedded systems students with a tool to design and develop automation applications using stepper motors and simple RS-232C serial communications. The stepper motors used is a bipolar six-wire configuration motor. Software drivers for serial communication and the stepper motors are written in the 'C' language using the High-performance Embedded Workshop (HEW) Integrated Development Environment provided with the Renesas Embedded Evaluation Board. The stepper motors are programmed to drive in full step, half step, and micro step mode. The circuit functionality was tested on a breadboard, and on compliance with the performance, a PCB was manufactured.","PeriodicalId":423683,"journal":{"name":"Proceedings 2007 IEEE SoutheastCon","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120995123","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 : 2007-03-22DOI: 10.1109/SECON.2007.342997
J. Roberts, A. Eastridge, D. Binkley, S. Thomas, R. Makki
An on-chip wideband CMOS transient supply current sensor is presented. The sensor permits on-chip transient supply current testing (iDDT) for circuits where supply current transients associated with circuit operation are measured and evaluated. The sensor was designed and fabricated in 0.5-mum CMOS technology and was physically demonstrated at 200 MHz sensing speeds. Measured results from the sensor show it is possible to distinguish between normal and faulty logic inverter operation. Extensions to the sensor design are presented including autozero circuitry to cancel MOS transistor mismatch.
提出了一种片上宽带CMOS瞬态电源电流传感器。该传感器允许对电路进行片上瞬态电源电流测试(iDDT)，其中测量和评估与电路操作相关的电源电流瞬态。该传感器采用0.5 μ m CMOS技术设计和制造，并在200 MHz的感应速度下进行了物理演示。传感器的测量结果表明，可以区分正常和故障的逻辑逆变器操作。扩展了传感器的设计，包括自动归零电路，以消除MOS晶体管失配。
{"title":"A high speed dynamic power supply current sensor","authors":"J. Roberts, A. Eastridge, D. Binkley, S. Thomas, R. Makki","doi":"10.1109/SECON.2007.342997","DOIUrl":"https://doi.org/10.1109/SECON.2007.342997","url":null,"abstract":"An on-chip wideband CMOS transient supply current sensor is presented. The sensor permits on-chip transient supply current testing (iDDT) for circuits where supply current transients associated with circuit operation are measured and evaluated. The sensor was designed and fabricated in 0.5-mum CMOS technology and was physically demonstrated at 200 MHz sensing speeds. Measured results from the sensor show it is possible to distinguish between normal and faulty logic inverter operation. Extensions to the sensor design are presented including autozero circuitry to cancel MOS transistor mismatch.","PeriodicalId":423683,"journal":{"name":"Proceedings 2007 IEEE SoutheastCon","volume":"28 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116681446","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 : 2007-03-22DOI: 10.1109/SECON.2007.342932
O. Mohammed, S. Ganu, N. Abed
This paper utilizes the wavelet packet transform to study the effects of change in the shape of the magnetic pole on the harmonic behavior of air gap flux density waveform. A surface mounted PM motor is used as an example. The original design contains 6 PM poles and 36 stator slots. The rotor and the stator winding are redesigned to have 4, 8, and 12 poles. The air gap flux density waveform is obtained from the finite element solutions. The results have been compared with different pole structure design. It has been found that there is not much difference in the harmonic content due to change in PM pole structure on the air gap flux density waveform.
{"title":"Effect of change in pole shape design on harmonic contents of PM synchronous motor air gap flux density waveform","authors":"O. Mohammed, S. Ganu, N. Abed","doi":"10.1109/SECON.2007.342932","DOIUrl":"https://doi.org/10.1109/SECON.2007.342932","url":null,"abstract":"This paper utilizes the wavelet packet transform to study the effects of change in the shape of the magnetic pole on the harmonic behavior of air gap flux density waveform. A surface mounted PM motor is used as an example. The original design contains 6 PM poles and 36 stator slots. The rotor and the stator winding are redesigned to have 4, 8, and 12 poles. The air gap flux density waveform is obtained from the finite element solutions. The results have been compared with different pole structure design. It has been found that there is not much difference in the harmonic content due to change in PM pole structure on the air gap flux density waveform.","PeriodicalId":423683,"journal":{"name":"Proceedings 2007 IEEE SoutheastCon","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123774588","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 : 2007-03-22DOI: 10.1109/SECON.2007.342880
Y. Hu
As the Internet becomes more mature and a part of our daily life, technologies used to provide continuous services of the Internet under all circumstances become more crucial. Collectively, these technologies ensure that resources are always available and stable. Since network attack is very easy to deploy and has very low cost, it has become the main reason of network instability and is the most challenge of current network security professionals. In this paper, we have studied the factors that cause network instability and investigated the potential countermeasures that enhance network security. We have proposed a framework to indicate the requirements of future queue management algorithm design.
{"title":"Network attacks and countermeasures","authors":"Y. Hu","doi":"10.1109/SECON.2007.342880","DOIUrl":"https://doi.org/10.1109/SECON.2007.342880","url":null,"abstract":"As the Internet becomes more mature and a part of our daily life, technologies used to provide continuous services of the Internet under all circumstances become more crucial. Collectively, these technologies ensure that resources are always available and stable. Since network attack is very easy to deploy and has very low cost, it has become the main reason of network instability and is the most challenge of current network security professionals. In this paper, we have studied the factors that cause network instability and investigated the potential countermeasures that enhance network security. We have proposed a framework to indicate the requirements of future queue management algorithm design.","PeriodicalId":423683,"journal":{"name":"Proceedings 2007 IEEE SoutheastCon","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121496111","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 : 2007-03-22DOI: 10.1109/SECON.2007.342992
Sen Xu, Chin-Tser Huang, M. Matthews
Multicast enables efficient large-scale content distribution and has become more and more popular in network service. Security is a critical issue for multicast because many applications require access control and privacy. This issue is more sensitive to wireless network, which is lack of physical boundaries. IEEE 802.16 is the standard for next generation wireless network, which aims to provide the last mile access for wireless metropolitan area network (WirelessMAN). Multicast is also supported in IEEE 802.16, and a multicast and broadcast rekeying algorithm (MBRA) is proposed as an optional function for secure multicast. However, this algorithm does not provide backward and forward secrecy, and is not scalable to large group. This paper reviews the above two deficiencies of MBRA and proposes a new algorithm to address them. We also propose algorithms for secure multicast in different scenarios of WirelessMAN besides its basic scheme.
{"title":"Secure multicast in various scenarios of WirelessMAN","authors":"Sen Xu, Chin-Tser Huang, M. Matthews","doi":"10.1109/SECON.2007.342992","DOIUrl":"https://doi.org/10.1109/SECON.2007.342992","url":null,"abstract":"Multicast enables efficient large-scale content distribution and has become more and more popular in network service. Security is a critical issue for multicast because many applications require access control and privacy. This issue is more sensitive to wireless network, which is lack of physical boundaries. IEEE 802.16 is the standard for next generation wireless network, which aims to provide the last mile access for wireless metropolitan area network (WirelessMAN). Multicast is also supported in IEEE 802.16, and a multicast and broadcast rekeying algorithm (MBRA) is proposed as an optional function for secure multicast. However, this algorithm does not provide backward and forward secrecy, and is not scalable to large group. This paper reviews the above two deficiencies of MBRA and proposes a new algorithm to address them. We also propose algorithms for secure multicast in different scenarios of WirelessMAN besides its basic scheme.","PeriodicalId":423683,"journal":{"name":"Proceedings 2007 IEEE SoutheastCon","volume":"58 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133648795","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 : 2007-03-22DOI: 10.1109/SECON.2007.342940
N.A. Rawashdeh, O. Martinez, M. Quiroga, K. D. Donohue
This paper presents algorithms for estimating parameters that characterize weak levels of printer banding in complex images. Flat field test images are typically used as test patterns for banding evaluation; however, the images of this study contain complex image content to demonstrate the algorithm's robustness and extend the utility of these defect characterization methods. The test images are from color printers in the development phase and include multiple visible defects such as banding, grain, and streaking. The banding characterization includes an estimation of the fundamental frequency and average power extracted from local regions dominated by low frequency content where banding is likely to be most visible and offensive. Grain and mottle defects combined with other image content form a difficult noise environment from which the quasi-periodic banding characteristics must be extracted. The algorithm is based on the autocorrelation function and uses special averaging and a pre-whitening filter designed to minimize the influence of the interfering factors. Experimental results show that this method provides accurate banding frequency and power characterization even for multiple banding sequences that are present in the image test area. This new algorithm proves computationally efficient and more accurate than parameter estimates based on frequency domain analysis using the power spectrum. Experimental results show accurate banding characterizations for periods ranging between 0.93 and 10.5 mm over a range of banding-to-noise ratios from 5.5 to -6.5 dB.
{"title":"Characterization of printer banding in regions of complex image content","authors":"N.A. Rawashdeh, O. Martinez, M. Quiroga, K. D. Donohue","doi":"10.1109/SECON.2007.342940","DOIUrl":"https://doi.org/10.1109/SECON.2007.342940","url":null,"abstract":"This paper presents algorithms for estimating parameters that characterize weak levels of printer banding in complex images. Flat field test images are typically used as test patterns for banding evaluation; however, the images of this study contain complex image content to demonstrate the algorithm's robustness and extend the utility of these defect characterization methods. The test images are from color printers in the development phase and include multiple visible defects such as banding, grain, and streaking. The banding characterization includes an estimation of the fundamental frequency and average power extracted from local regions dominated by low frequency content where banding is likely to be most visible and offensive. Grain and mottle defects combined with other image content form a difficult noise environment from which the quasi-periodic banding characteristics must be extracted. The algorithm is based on the autocorrelation function and uses special averaging and a pre-whitening filter designed to minimize the influence of the interfering factors. Experimental results show that this method provides accurate banding frequency and power characterization even for multiple banding sequences that are present in the image test area. This new algorithm proves computationally efficient and more accurate than parameter estimates based on frequency domain analysis using the power spectrum. Experimental results show accurate banding characterizations for periods ranging between 0.93 and 10.5 mm over a range of banding-to-noise ratios from 5.5 to -6.5 dB.","PeriodicalId":423683,"journal":{"name":"Proceedings 2007 IEEE SoutheastCon","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114867105","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 : 2007-03-22DOI: 10.1109/SECON.2007.342934
H. Watson, M. Heimer, J. Andrian, A. Barreto
A polygraph is a tool which provides access, visualization and analysis for large amounts of recorded physiologic data. The goal of this work is to provide an open source framework for studying and detailing data. Recorded data, internal epochs, montages, and a graphic user interface (GUI) are linked together with this realization.
{"title":"Polygraph realization for data visualization and analysis","authors":"H. Watson, M. Heimer, J. Andrian, A. Barreto","doi":"10.1109/SECON.2007.342934","DOIUrl":"https://doi.org/10.1109/SECON.2007.342934","url":null,"abstract":"A polygraph is a tool which provides access, visualization and analysis for large amounts of recorded physiologic data. The goal of this work is to provide an open source framework for studying and detailing data. Recorded data, internal epochs, montages, and a graphic user interface (GUI) are linked together with this realization.","PeriodicalId":423683,"journal":{"name":"Proceedings 2007 IEEE SoutheastCon","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115426792","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 : 2007-03-22DOI: 10.1109/SECON.2007.342902
M. Mohan, Sen. Mem
A nonlinear dynamic system model is proposed for the bipolar mood disorder, which is characterized mood swings between manic and depressive states. The nature of the oscillation suggests that the underlying dynamics are nonlinear. The proposed model helps better understand the oscillations and how to quench them.
{"title":"Nonlinear dynamic system model of bipolar mood disorder","authors":"M. Mohan, Sen. Mem","doi":"10.1109/SECON.2007.342902","DOIUrl":"https://doi.org/10.1109/SECON.2007.342902","url":null,"abstract":"A nonlinear dynamic system model is proposed for the bipolar mood disorder, which is characterized mood swings between manic and depressive states. The nature of the oscillation suggests that the underlying dynamics are nonlinear. The proposed model helps better understand the oscillations and how to quench them.","PeriodicalId":423683,"journal":{"name":"Proceedings 2007 IEEE SoutheastCon","volume":"191 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115428722","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 : 2007-03-22DOI: 10.1109/SECON.2007.342946
K. D. Donohue, A. Agrinsoni, J. Hannemann
This work examines time and frequency domain implementations for estimating delays between acoustic signals arriving at spatially distributed microphones. A parametric variant of the phase-only transform (PHAT) is introduced for partially whitening the signal before estimating the delay. The PHAT variant is referred to as the PHAT-beta and is shown to be advantageous when processing signals corrupted by both independent noise and reverberation effects. Simulations show superior performance for the time-domain implementation under conditions of independent noise for time-limited broadband signals, achieving low estimation errors at signal-to-noise ratios 8 to 13 dB lower than that required for a frequency-domain implementation. Extensive Monte Carlo simulations are also performed for the time-domain delay estimator using the PHAT-beta on speech signals corrupted by reverberation and independent noise. Performance metrics include percent anomalous detections as well as the root mean square estimation error. Results show that partial whitening leads to significant improvements over zero or total whitening (as in the case of the standard PHAT). Simulations indicate that robust performance can be achieved for beta values near 0.4 when both reverberations and independent noises are present.
{"title":"Audio signal delay estimation using partial whitening","authors":"K. D. Donohue, A. Agrinsoni, J. Hannemann","doi":"10.1109/SECON.2007.342946","DOIUrl":"https://doi.org/10.1109/SECON.2007.342946","url":null,"abstract":"This work examines time and frequency domain implementations for estimating delays between acoustic signals arriving at spatially distributed microphones. A parametric variant of the phase-only transform (PHAT) is introduced for partially whitening the signal before estimating the delay. The PHAT variant is referred to as the PHAT-beta and is shown to be advantageous when processing signals corrupted by both independent noise and reverberation effects. Simulations show superior performance for the time-domain implementation under conditions of independent noise for time-limited broadband signals, achieving low estimation errors at signal-to-noise ratios 8 to 13 dB lower than that required for a frequency-domain implementation. Extensive Monte Carlo simulations are also performed for the time-domain delay estimator using the PHAT-beta on speech signals corrupted by reverberation and independent noise. Performance metrics include percent anomalous detections as well as the root mean square estimation error. Results show that partial whitening leads to significant improvements over zero or total whitening (as in the case of the standard PHAT). Simulations indicate that robust performance can be achieved for beta values near 0.4 when both reverberations and independent noises are present.","PeriodicalId":423683,"journal":{"name":"Proceedings 2007 IEEE SoutheastCon","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122813161","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 : 2007-03-22DOI: 10.1109/SECON.2007.342937
L.J. Bunni, K. Altaii
A method is given for the analysis of a multilayer cylindrical induction heating system. The excitation is circumferential and can be three phase or single-phase. The iterative form of solution allows for linear and nonlinear charges. Accuracy of the method is verified with measurements of practical induction heating system together with comparison to numerical and analytical methods.
{"title":"The layer theory approach applied to induction heating systems with rotational symmetry","authors":"L.J. Bunni, K. Altaii","doi":"10.1109/SECON.2007.342937","DOIUrl":"https://doi.org/10.1109/SECON.2007.342937","url":null,"abstract":"A method is given for the analysis of a multilayer cylindrical induction heating system. The excitation is circumferential and can be three phase or single-phase. The iterative form of solution allows for linear and nonlinear charges. Accuracy of the method is verified with measurements of practical induction heating system together with comparison to numerical and analytical methods.","PeriodicalId":423683,"journal":{"name":"Proceedings 2007 IEEE SoutheastCon","volume":"17 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125788330","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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