Pub Date : 2008-03-03DOI: 10.1109/CONIELECOMP.2008.36
J. Hernández, C. A. O. Zezzatti, J. Andaverde, G. Burlak
This paper describes the use of a prototype online assessment system with biometric recognition capabilities applied to evaluate basic knowledge in a High School. The prototype system represents a first approach to identify remote students in online assessment to solve the well known problem: Who's there?. For our experiment, we randomly selected a sample of students (n=102) from a public High School, located in Morelos, Mexico. We carried out two evaluations, a control evaluation (paper and pencil), and a second test with our system with biometric recognition, this system authenticates the student by means of index fingerprint, allows subject selection to be evaluated, and shows the assessment consisting of a set of time limited questions and randomly ordered answers, simultaneously the student is being monitored by web cams until test is finished. Low grades were obtained using computerized test, due students feel lot of stress when time to answer is limited and a web cam is monitoring them, fingerprint recognition was very well accepted.
{"title":"Biometrics in Online Assessments: A Study Case in High School Students","authors":"J. Hernández, C. A. O. Zezzatti, J. Andaverde, G. Burlak","doi":"10.1109/CONIELECOMP.2008.36","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.36","url":null,"abstract":"This paper describes the use of a prototype online assessment system with biometric recognition capabilities applied to evaluate basic knowledge in a High School. The prototype system represents a first approach to identify remote students in online assessment to solve the well known problem: Who's there?. For our experiment, we randomly selected a sample of students (n=102) from a public High School, located in Morelos, Mexico. We carried out two evaluations, a control evaluation (paper and pencil), and a second test with our system with biometric recognition, this system authenticates the student by means of index fingerprint, allows subject selection to be evaluated, and shows the assessment consisting of a set of time limited questions and randomly ordered answers, simultaneously the student is being monitored by web cams until test is finished. Low grades were obtained using computerized test, due students feel lot of stress when time to answer is limited and a web cam is monitoring them, fingerprint recognition was very well accepted.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133418403","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 : 2008-03-03DOI: 10.1109/CONIELECOMP.2008.13
L. Morales-Mendoza, Y. Shmaliy, O. Ibarra-Manzano, L. Arceo-Miquel, M. Montiel-Rodriguez
In this work, we present a novel technique for ultrasound image processing (2D signals). The moving average hybrid FIR filter (MAH-FIR) which it work with two different FIR filter, the moving average (MA) and median hybrid (FMH) filters. We experimented with continuous linear regression function and Lagrange multiplier to obtain the approximation of the MA-FIR and FMH-FIR filters, respectively. Furthermore, we showed both filters composed into a block diagram. Finally, we present evaluations qualitative and quantitative of ultrasound image processing.
{"title":"Moving Average Hybrid FIR Filter in Ultrasound Image Processing","authors":"L. Morales-Mendoza, Y. Shmaliy, O. Ibarra-Manzano, L. Arceo-Miquel, M. Montiel-Rodriguez","doi":"10.1109/CONIELECOMP.2008.13","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.13","url":null,"abstract":"In this work, we present a novel technique for ultrasound image processing (2D signals). The moving average hybrid FIR filter (MAH-FIR) which it work with two different FIR filter, the moving average (MA) and median hybrid (FMH) filters. We experimented with continuous linear regression function and Lagrange multiplier to obtain the approximation of the MA-FIR and FMH-FIR filters, respectively. Furthermore, we showed both filters composed into a block diagram. Finally, we present evaluations qualitative and quantitative of ultrasound image processing.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134614277","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 : 2008-03-03DOI: 10.1109/CONIELECOMP.2008.10
G. Saldaña-González, M. Arias-Estrada
This work presents a reconfigurable computing architecture targeting a Virtex-II device. In this approach a systolic array for low-level image processing is considered. The architecture is customizable providing the possibility of performing window operations with masks of variable size and every processing element in the array can be configured according to a control word. The architecture comprises a scheme to reduce the number of accesses to data memory and router elements to handle data movement among different structures inside the same architecture, these components add the possibility of chaining interconnection of multiple processing blocks. In order to turn the architecture into a real platform, support has been provided to the motion estimation algorithm which presents higher complexity. In this modality the 2D array operates with a double ALU that allows searching multiple macro-blocks in parallel. Results using 640 times 480 gray level images show that a peak performance of 9 GOPS can be achieved.
{"title":"A Low-Level Image Processing Algorithms Accelerator Platform","authors":"G. Saldaña-González, M. Arias-Estrada","doi":"10.1109/CONIELECOMP.2008.10","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.10","url":null,"abstract":"This work presents a reconfigurable computing architecture targeting a Virtex-II device. In this approach a systolic array for low-level image processing is considered. The architecture is customizable providing the possibility of performing window operations with masks of variable size and every processing element in the array can be configured according to a control word. The architecture comprises a scheme to reduce the number of accesses to data memory and router elements to handle data movement among different structures inside the same architecture, these components add the possibility of chaining interconnection of multiple processing blocks. In order to turn the architecture into a real platform, support has been provided to the motion estimation algorithm which presents higher complexity. In this modality the 2D array operates with a double ALU that allows searching multiple macro-blocks in parallel. Results using 640 times 480 gray level images show that a peak performance of 9 GOPS can be achieved.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126403118","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 : 2008-03-03DOI: 10.1109/CONIELECOMP.2008.35
P. B. Sánchez, S. Flores
This paper presents a novel technique to obtain asymmetrical output voltage from the automobile alternator windings. The goal is reached with the help of a three-phase power factor correction circuit. The output voltage levels proposed are 14 V and 42 V. The first one is used to supply the battery and the standard electrical loads within the vehicle such as control units and sensors. The other level could be used to supply heavier loads that require more power. This kind of loads is frequently found in new vehicles. Also it is presented a detailed analysis of the proposed topology, input current ripple, design of the line inductors and duty cycles. In addition simulations and experimental results are shown for a 40 kHz switching frequency.
{"title":"Three-Phase Power Factor Correction Circuit with Asymmetrical Output for Automobile Applications","authors":"P. B. Sánchez, S. Flores","doi":"10.1109/CONIELECOMP.2008.35","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.35","url":null,"abstract":"This paper presents a novel technique to obtain asymmetrical output voltage from the automobile alternator windings. The goal is reached with the help of a three-phase power factor correction circuit. The output voltage levels proposed are 14 V and 42 V. The first one is used to supply the battery and the standard electrical loads within the vehicle such as control units and sensors. The other level could be used to supply heavier loads that require more power. This kind of loads is frequently found in new vehicles. Also it is presented a detailed analysis of the proposed topology, input current ripple, design of the line inductors and duty cycles. In addition simulations and experimental results are shown for a 40 kHz switching frequency.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127355366","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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