Pub Date : 2008-03-03DOI: 10.1109/CONIELECOMP.2008.40
F. Ramírez, Marva Angélica Mora Lumbreras
Nowadays is quite common to find personal computers with two monitors, all they need is a video card with outputs to (at least) two monitors, which should be as identical as possible, and show each image in the stereo pair, through each monitor. This paper shows first how to build a simple set of mirrors so that each eye will look at a different monitor, and second, how to write an OpenGL code that computes correct stereo pairs of a moving scene and displays them, each on its own monitor, enabling us to see it in real 3D.
{"title":"Obtaining Stereographics Using a Two-Monitor System and a Set of Mirrors","authors":"F. Ramírez, Marva Angélica Mora Lumbreras","doi":"10.1109/CONIELECOMP.2008.40","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.40","url":null,"abstract":"Nowadays is quite common to find personal computers with two monitors, all they need is a video card with outputs to (at least) two monitors, which should be as identical as possible, and show each image in the stereo pair, through each monitor. This paper shows first how to build a simple set of mirrors so that each eye will look at a different monitor, and second, how to write an OpenGL code that computes correct stereo pairs of a moving scene and displays them, each on its own monitor, enabling us to see it in real 3D.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"29 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":"123589342","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.2008.29
Edrey D. Ruiz-Rojas, J. Vázquez-González, R. A. Palomares, A. Z. Escudero-Uribe, J. R. Vazquez
This paper presents the kinematic and dynamic model of a linear electric actuator. The kinematic model was obtained by geometric analysis. The dynamic model was obtained with Lagrange's methodology. This linear actuator forms part of parallel prosthetic elbow with 3 DOF developed in the Instituto Nacional de Astrofisica, Optica y Electronica (INAOE). This linear actuator will be used in the elbow prosthesis in order to emulate the capacity of a muscle to extend and contract in a linear way. In this paper we show the behavior the electromechanical according to the equations of the system and its physical parameters. The model includes the analysis of electrical and mechanical parts. The model includes conversion of rotational movement to linear movement and relation torque-force necessary for emulating a human muscle.
{"title":"Mathematical Model of a Linear Electric Actuator with Prosthesis Applications","authors":"Edrey D. Ruiz-Rojas, J. Vázquez-González, R. A. Palomares, A. Z. Escudero-Uribe, J. R. Vazquez","doi":"10.1109/CONIELECOMP.2008.29","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.29","url":null,"abstract":"This paper presents the kinematic and dynamic model of a linear electric actuator. The kinematic model was obtained by geometric analysis. The dynamic model was obtained with Lagrange's methodology. This linear actuator forms part of parallel prosthetic elbow with 3 DOF developed in the Instituto Nacional de Astrofisica, Optica y Electronica (INAOE). This linear actuator will be used in the elbow prosthesis in order to emulate the capacity of a muscle to extend and contract in a linear way. In this paper we show the behavior the electromechanical according to the equations of the system and its physical parameters. The model includes the analysis of electrical and mechanical parts. The model includes conversion of rotational movement to linear movement and relation torque-force necessary for emulating a human muscle.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"26 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":"134024372","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.2008.12
S. Castillo-Perez, G. Ayala
In this paper we introduce ARMOLEO, an ARchitecture for MObile LEarning Objects based on our concept of mobile learning objects. This architecture is aimed to allow learners to participate in individual or collaborative learning through simulated or real time authentic activities, supporting situated, personalized and collaborative learning.
{"title":"ARMOLEO: An Architecture for Mobile Learning Objects","authors":"S. Castillo-Perez, G. Ayala","doi":"10.1109/CONIELECOMP.2008.12","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.12","url":null,"abstract":"In this paper we introduce ARMOLEO, an ARchitecture for MObile LEarning Objects based on our concept of mobile learning objects. This architecture is aimed to allow learners to participate in individual or collaborative learning through simulated or real time authentic activities, supporting situated, personalized and collaborative learning.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"27 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":"131814125","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.2008.31
Alejos-Palomares R, Ramírez Cortes, Domínguez-Martinez N
In the present document, the design and the construction of a low cost digital spirometer is presented like a basic tool for evaluate of the respiratory capacity. A Spirometer is the ideal instrument to measure the mechanics ventilatoria in respiratory studies that allow the analysis, determination and monitoring of diverse human respiratory diseases like asthma, pulmonary embolism, respiratory bronchitis and others deficiencies. The spirometer developed is an instrument portable, of easy handling and computerized that fulfills with the American norms given by the American Thorax Society (ATS) and the requirements of the Mexican population. By means of digital electronics and a pneumotachometer, the virtual instrument acquires and the respiratory flow using a NI USB interface. The volume-time and flow-volume graphs are displayed means a virtual instrument developed in Labview. The spirometrics test includes parameters of the mechanics ventilatoria like the FEV1 (Forced Expiratory Volume in the first second), FVC (Forced Vital Capacity), and MEF (Maximum Expiratory Flow).
{"title":"Digital Spirometer with LabView Interface","authors":"Alejos-Palomares R, Ramírez Cortes, Domínguez-Martinez N","doi":"10.1109/CONIELECOMP.2008.31","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.31","url":null,"abstract":"In the present document, the design and the construction of a low cost digital spirometer is presented like a basic tool for evaluate of the respiratory capacity. A Spirometer is the ideal instrument to measure the mechanics ventilatoria in respiratory studies that allow the analysis, determination and monitoring of diverse human respiratory diseases like asthma, pulmonary embolism, respiratory bronchitis and others deficiencies. The spirometer developed is an instrument portable, of easy handling and computerized that fulfills with the American norms given by the American Thorax Society (ATS) and the requirements of the Mexican population. By means of digital electronics and a pneumotachometer, the virtual instrument acquires and the respiratory flow using a NI USB interface. The volume-time and flow-volume graphs are displayed means a virtual instrument developed in Labview. The spirometrics test includes parameters of the mechanics ventilatoria like the FEV1 (Forced Expiratory Volume in the first second), FVC (Forced Vital Capacity), and MEF (Maximum Expiratory Flow).","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"1 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":"114616325","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.2008.32
L. G. Guerrero-Ojeda, Alfredo Florián-Méndez, Alejandro Aragón Zavala, J. Cuevas-Ruíz
This paper shows the procedure to gather propagation measurements to characterize the path loss of cantera stone for the penetration of RF signals at UHF frequencies in various Mexican historic buildings. It is the first time that such material is tested for RF propagation and since there are many buildings made of this material in many cities in Mexico the results obtained are the base for future research as it is conducted now and will be published in the weeks to follow. The places where the experiment was conducted are: Municipal Government Building in Oaxaca, Benito Juarez Masonic Lodge Building in Oaxaca both buildings made of green cantera stone; Casa del Dean Museum and Tecamachalco Ex Convent in Puebla made of gray cantera stone. The frequencies at which the experiment was conducted were around 900 MHz, in the UHF band.
本文展示了在墨西哥各种历史建筑中收集传播测量数据以表征射频信号在超高频频率下穿透cantera stone的路径损耗的过程。这是第一次对这种材料进行射频传播测试，因为在墨西哥的许多城市中有许多由这种材料制成的建筑物，所获得的结果是未来研究的基础，因为它正在进行中，并将在接下来的几周内发表。实验进行的地点是:瓦哈卡的市政府大楼，瓦哈卡的Benito Juarez Masonic Lodge大楼，这两个建筑都是用绿色cantera石建造的;普埃布拉的Casa del Dean博物馆和Tecamachalco Ex修道院由灰色cantera石材制成。实验进行的频率大约是900兆赫，在超高频波段。
{"title":"Propagation Measurements for Path Loss Characterization of Cantera Walls at UHF in Mexican Historic Buildings","authors":"L. G. Guerrero-Ojeda, Alfredo Florián-Méndez, Alejandro Aragón Zavala, J. Cuevas-Ruíz","doi":"10.1109/CONIELECOMP.2008.32","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.32","url":null,"abstract":"This paper shows the procedure to gather propagation measurements to characterize the path loss of cantera stone for the penetration of RF signals at UHF frequencies in various Mexican historic buildings. It is the first time that such material is tested for RF propagation and since there are many buildings made of this material in many cities in Mexico the results obtained are the base for future research as it is conducted now and will be published in the weeks to follow. The places where the experiment was conducted are: Municipal Government Building in Oaxaca, Benito Juarez Masonic Lodge Building in Oaxaca both buildings made of green cantera stone; Casa del Dean Museum and Tecamachalco Ex Convent in Puebla made of gray cantera stone. The frequencies at which the experiment was conducted were around 900 MHz, in the UHF band.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"1 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":"128233168","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.2008.7
José Velázquez López, J. Ochoa, Daniel Espinobarro, J. Sanchez
In this work we present the analysis and implementation in a digital signal processor (DSP), of a variant of the least mean square (LMS) algorithm. Modification is based on codifying the error of the algorithm, in order to reduce the design complexity for its implementation in digital adaptive filters, because the error is made up of whole values. The results demonstrate an increase in the convergence speed; it's affected indirectly by the convergence factor, and to obtain a floating point operation reduction, which accelerates processing. These, to demonstrate the results obtained from the implementation of the algorithm in the digital signal processor TMS320C6713 by Texas instruments.
{"title":"Analysis and Implementation of LMS Algorithm with Coding Error in the DSP TMS320C6713","authors":"José Velázquez López, J. Ochoa, Daniel Espinobarro, J. Sanchez","doi":"10.1109/CONIELECOMP.2008.7","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.7","url":null,"abstract":"In this work we present the analysis and implementation in a digital signal processor (DSP), of a variant of the least mean square (LMS) algorithm. Modification is based on codifying the error of the algorithm, in order to reduce the design complexity for its implementation in digital adaptive filters, because the error is made up of whole values. The results demonstrate an increase in the convergence speed; it's affected indirectly by the convergence factor, and to obtain a floating point operation reduction, which accelerates processing. These, to demonstrate the results obtained from the implementation of the algorithm in the digital signal processor TMS320C6713 by Texas instruments.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"71 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":"115843787","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.2008.15
S. Gonzalez, L. Jiménez, A. Mendoza, E. Corral, R. Guerra, R. Jiménez
In this paper a control algorithm is proposed, which provides positive signals to the propeller inputs of a 3 degrees of freedom arm-helicopter system, in consequence the propellers spin only in one direction. The originality of this paper in reference to similar papers, is the fact that preview control algorithms are designed to allow propeller spin in both directions, that bring to the helicopter system a movement acting in the same direction of gravitation force, in practical sense this never happens, because the helicopter system presents an unstable behavior. The proposed algorithm regulates the system angular position using information of angular displacements measurements to generate only positive control signals, and also compensates the unknown friction effects present in the joints of the system. The performance of the algorithm is evaluated using numerical tests, which shows the system stability considering the regulation problem of two degrees of freedom, in the same sense a stability argumentation is presented to validate the control algorithm proposed.
{"title":"Arm-Helicopter Control with Positive Signals","authors":"S. Gonzalez, L. Jiménez, A. Mendoza, E. Corral, R. Guerra, R. Jiménez","doi":"10.1109/CONIELECOMP.2008.15","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.15","url":null,"abstract":"In this paper a control algorithm is proposed, which provides positive signals to the propeller inputs of a 3 degrees of freedom arm-helicopter system, in consequence the propellers spin only in one direction. The originality of this paper in reference to similar papers, is the fact that preview control algorithms are designed to allow propeller spin in both directions, that bring to the helicopter system a movement acting in the same direction of gravitation force, in practical sense this never happens, because the helicopter system presents an unstable behavior. The proposed algorithm regulates the system angular position using information of angular displacements measurements to generate only positive control signals, and also compensates the unknown friction effects present in the joints of the system. The performance of the algorithm is evaluated using numerical tests, which shows the system stability considering the regulation problem of two degrees of freedom, in the same sense a stability argumentation is presented to validate the control algorithm proposed.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"161 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":"121275881","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.2008.33
C. Velasco-Casillas, F. Toledo-Flores, J. Cuevas-Ruíz, Alejandro Aragón Zavala, J. A. Delgado-Penín
In frequencies over 10 GHz the rain is the most important factor to take in count to evaluate the attenuation level. For several kinds of applications is very useful to known this attenuation in the link every moment while the link is in operation to implement some strategy to mitigate it. According to the ITU-R, there is a procedure to calculate the rain attenuation, however this methodology gives only an average and constant attenuation value. In this work, an automatic procedure to obtain the instant attenuation level for several frequencies using the data provided by MNS (Meteorological National System) in Mexico is explained and their publication in a Web server is showed. Using these values, attenuation maps are elaborated and published in that Web server too.
{"title":"Automatic Generation of Rain-Attenuation Maps According to the Rain-Rate Provided by Instant Data of Meteorological Stations in Mexico","authors":"C. Velasco-Casillas, F. Toledo-Flores, J. Cuevas-Ruíz, Alejandro Aragón Zavala, J. A. Delgado-Penín","doi":"10.1109/CONIELECOMP.2008.33","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.33","url":null,"abstract":"In frequencies over 10 GHz the rain is the most important factor to take in count to evaluate the attenuation level. For several kinds of applications is very useful to known this attenuation in the link every moment while the link is in operation to implement some strategy to mitigate it. According to the ITU-R, there is a procedure to calculate the rain attenuation, however this methodology gives only an average and constant attenuation value. In this work, an automatic procedure to obtain the instant attenuation level for several frequencies using the data provided by MNS (Meteorological National System) in Mexico is explained and their publication in a Web server is showed. Using these values, attenuation maps are elaborated and published in that Web server too.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"76 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":"133690303","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.2008.24
E. Gomez-Hernández, C. F. Uribe, R. Cumplido
This work presents a hardware architecture of the ConText steganographic technique in a Cyclone II FPGA of the Altera family. The ConText technique takes advantage of noisy regions and those with abrupt gray levels changes in an image where the hidden information is very difficult to detect; the process to locate this region is highly repetitive and computationally expensive. The technique is implemented in an FPGA to increase the processing speed. The implementation results show a throughput of 61.5 Mbps.
这项工作提出了Altera家族的Cyclone II FPGA中的上下文隐写技术的硬件架构。上下文技术利用了图像中的噪声区域和灰度突变区域，这些区域的隐藏信息很难被检测到;定位该区域的过程是高度重复的，并且计算成本很高。该技术在FPGA中实现，以提高处理速度。实现结果显示吞吐量为61.5 Mbps。
{"title":"FPGA Hardware Architecture of the Steganographic ConText Technique","authors":"E. Gomez-Hernández, C. F. Uribe, R. Cumplido","doi":"10.1109/CONIELECOMP.2008.24","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.24","url":null,"abstract":"This work presents a hardware architecture of the ConText steganographic technique in a Cyclone II FPGA of the Altera family. The ConText technique takes advantage of noisy regions and those with abrupt gray levels changes in an image where the hidden information is very difficult to detect; the process to locate this region is highly repetitive and computationally expensive. The technique is implemented in an FPGA to increase the processing speed. The implementation results show a throughput of 61.5 Mbps.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"29 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":"121404579","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.2008.16
A. Zemliak
The problem of analog system design for a minimal computer time has been formulated as the functional minimization problem of the control theory. The design process in this case is formulated as the controllable dynamic system. The optimal sequence of the control vector switch points was determined as a principal characteristic of the minimal-time system design algorithm. The different forms of the Lyapunov function were proposed to analyze the behavior of design process. The special function that is a combination of Lyapunov function and its time derivative was proposed to predict the optimal control vector structure.
{"title":"Analysis of the Lyapunov Function of Design Process for Different Design Strategies","authors":"A. Zemliak","doi":"10.1109/CONIELECOMP.2008.16","DOIUrl":"https://doi.org/10.1109/CONIELECOMP.2008.16","url":null,"abstract":"The problem of analog system design for a minimal computer time has been formulated as the functional minimization problem of the control theory. The design process in this case is formulated as the controllable dynamic system. The optimal sequence of the control vector switch points was determined as a principal characteristic of the minimal-time system design algorithm. The different forms of the Lyapunov function were proposed to analyze the behavior of design process. The special function that is a combination of Lyapunov function and its time derivative was proposed to predict the optimal control vector structure.","PeriodicalId":202730,"journal":{"name":"18th International Conference on Electronics, Communications and Computers (conielecomp 2008)","volume":"295 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":"124234344","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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