The use of directional antennas in support of ad hoc networks has been considered a promising alternative to improve spatial division multiple access and throughput. In general, directional Medium Access Control (MAC) protocols are based on IEEE 802.11 standard, which was designed for omnidirectional communication. When applied to directional communication, the standard imposes a number of constraints to the directional MAC protocol. In order to harvest the benets of directional communications, MAC protocols tailored for directional antennas have to be devised. In particular, MAC protocols that are able to deal with deafness and channel reservation latency are highly desirable. This work proposes a technique that enables channel reservation and mitigates deafness using pulse/tone signals in the context of directional communications. At its heart, the proposed technique incorporates a deafness predictions scheme that helps nodes to overcome its eects. Analytical results show that the proposed technique is able to improve throughput up to 40% when compared to other prominent directional MAC protocols. Simulation results show that the proposed scheme improves fairness and throughput up to 350% and 76%, respectively.
{"title":"Directional Pulse/Tone Based Channel Reservation with Deafness Avoidance","authors":"Lucas de Melo Guimarães, J. Bordim","doi":"10.19153/CLEIEJ.16.3.1","DOIUrl":"https://doi.org/10.19153/CLEIEJ.16.3.1","url":null,"abstract":"The use of directional antennas in support of ad hoc networks has been considered a promising alternative to improve spatial division multiple access and throughput. In general, directional Medium Access Control (MAC) protocols are based on IEEE 802.11 standard, which was designed for omnidirectional communication. When applied to directional communication, the standard imposes a number of constraints to the directional MAC protocol. In order to harvest the benets of directional communications, MAC protocols tailored for directional antennas have to be devised. In particular, MAC protocols that are able to deal with deafness and channel reservation latency are highly desirable. This work proposes a technique that enables channel reservation and mitigates deafness using pulse/tone signals in the context of directional communications. At its heart, the proposed technique incorporates a deafness predictions scheme that helps nodes to overcome its eects. Analytical results show that the proposed technique is able to improve throughput up to 40% when compared to other prominent directional MAC protocols. Simulation results show that the proposed scheme improves fairness and throughput up to 350% and 76%, respectively.","PeriodicalId":30032,"journal":{"name":"CLEI Electronic Journal","volume":"16 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67758384","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}
Romuere R. V. Silva, K. Aires, R. Veras, Thiago S. Santos, K. A. B. Lima, A. Soares
Motorcycle accidents have been rapidly growing throughout the years in many countries. Due to various social and economic factors, this type of vehicle is becoming increasingly popular. Over the past years, automated mechanisms to inspect traffic violations such as radars and surveillance cameras are being used ever more. This paper’s goals are the study and implementation of some methods for automatic detection of motorcycles on public roads. Traffic images captured by cameras were used. For feature extraction of images, the algorithms SURF, HAAR, HOG and LBP were used as descriptors. For image classification, Multilayer Perceptron, Support Vector Machines and Radial-Bases Function Networks were used as classifiers. Finally, the results are presented and discussed.
{"title":"Automatic Motorcycle Detection on Public Roads","authors":"Romuere R. V. Silva, K. Aires, R. Veras, Thiago S. Santos, K. A. B. Lima, A. Soares","doi":"10.19153/CLEIEJ.16.3.4","DOIUrl":"https://doi.org/10.19153/CLEIEJ.16.3.4","url":null,"abstract":"Motorcycle accidents have been rapidly growing throughout the years in many countries. Due to various social and economic factors, this type of vehicle is becoming increasingly popular. Over the past years, automated mechanisms to inspect traffic violations such as radars and surveillance cameras are being used ever more. This paper’s goals are the study and implementation of some methods for automatic detection of motorcycles on public roads. Traffic images captured by cameras were used. For feature extraction of images, the algorithms SURF, HAAR, HOG and LBP were used as descriptors. For image classification, Multilayer Perceptron, Support Vector Machines and Radial-Bases Function Networks were used as classifiers. Finally, the results are presented and discussed.","PeriodicalId":30032,"journal":{"name":"CLEI Electronic Journal","volume":"16 1","pages":"4-4"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67758864","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}
Usability is one of the most important software qua lity attributes regarding its acceptability by end users. It is even more important in the context of Web applications. One way of evaluating application usability is through inspect ions. The WDP (Web Design Perspectivesbased Usability Inspection Technique) presents evid ence of industrial use feasibility; however some computerized support had been suggested by practitioners. Therefore, the WDP Tool was built, aiming to provide automated support the WDP technique application, reducing the effort involved in usability inspections with WDP. This paper presents two observational studies regarding the use of the WDP Tool use, one in vivo and one in vitro , which aimed to analyze the cost-effectiveness of its application a nd its appropriateness to the industrial environment through the Technology Acceptance Model (TAM). The results provide indications about the feasibility of using the WDP Tool to support usability inspections in real software development projects in the industry.
{"title":"Empirical Assessments of a tool to support Web usability inspection","authors":"Verônica T. Vaz, T. Conte, G. Travassos","doi":"10.19153/CLEIEJ.16.3.6","DOIUrl":"https://doi.org/10.19153/CLEIEJ.16.3.6","url":null,"abstract":"Usability is one of the most important software qua lity attributes regarding its acceptability by end users. It is even more important in the context of Web applications. One way of evaluating application usability is through inspect ions. The WDP (Web Design Perspectivesbased Usability Inspection Technique) presents evid ence of industrial use feasibility; however some computerized support had been suggested by practitioners. Therefore, the WDP Tool was built, aiming to provide automated support the WDP technique application, reducing the effort involved in usability inspections with WDP. This paper presents two observational studies regarding the use of the WDP Tool use, one in vivo and one in vitro , which aimed to analyze the cost-effectiveness of its application a nd its appropriateness to the industrial environment through the Technology Acceptance Model (TAM). The results provide indications about the feasibility of using the WDP Tool to support usability inspections in real software development projects in the industry.","PeriodicalId":30032,"journal":{"name":"CLEI Electronic Journal","volume":"16 1","pages":"6-6"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67758926","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}
Quantum computing proposes quantum algorithms exponentially faster than their classical analogues when executed by a quantum computer. As quantum computers are currently unavailable for general use, one approach for analyzing the behavior and results of such algorithms is the simulation using classical computers. As this simulation is inecient due to the exponential growth of the temporal and spatial complexities, solutions for these two problems are essential in order to increase the simulation capabilities of any simulator. This work proposes the development of a methodology dened by two main steps: the rst consists of the sequential implementation of the abstractions corresponding to the Quantum Processes and Quantum Partial Processes dened in the qGM model for reduction in memory consumption related to multidimensional quantum transformations; the second is the parallel implementation of such abstractions allowing its execution on GPUs. The results obtained by this work embrace the sequential simulation of controlled transformations up to 24 qubits. In the parallel simulation approach, Hadamard gates up to 20 qubits were simulated with a speedup of ≈ 50× over an 8-core parallel simulation, which is a signicant performance improvement in the VPE-qGM environment when compared with its previous limitations.
{"title":"Expanding the VPE-qGM Environment Towards a Parallel Quantum Simulation of Quantum Processes Using GPUs","authors":"A. Maron, R. Reiser, M. Pilla, A. Yamin","doi":"10.19153/CLEIEJ.16.3.3","DOIUrl":"https://doi.org/10.19153/CLEIEJ.16.3.3","url":null,"abstract":"Quantum computing proposes quantum algorithms exponentially faster than their classical analogues when executed by a quantum computer. As quantum computers are currently unavailable for general use, one approach for analyzing the behavior and results of such algorithms is the simulation using classical computers. As this simulation is inecient due to the exponential growth of the temporal and spatial complexities, solutions for these two problems are essential in order to increase the simulation capabilities of any simulator. This work proposes the development of a methodology dened by two main steps: the rst consists of the sequential implementation of the abstractions corresponding to the Quantum Processes and Quantum Partial Processes dened in the qGM model for reduction in memory consumption related to multidimensional quantum transformations; the second is the parallel implementation of such abstractions allowing its execution on GPUs. The results obtained by this work embrace the sequential simulation of controlled transformations up to 24 qubits. In the parallel simulation approach, Hadamard gates up to 20 qubits were simulated with a speedup of ≈ 50× over an 8-core parallel simulation, which is a signicant performance improvement in the VPE-qGM environment when compared with its previous limitations.","PeriodicalId":30032,"journal":{"name":"CLEI Electronic Journal","volume":"1 1","pages":"3-3"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67758508","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}
This paper presents a description of the environments of individualized learning (Based on the Intelligent Tutoring Systems, ITS), the Computer Supported Collaborative Learning (CSCL), Multi-Agent Systems (MAS) and the artificial intelligence techniques called: Instructional Planning (IP) and Case-Based Reasoning (CBR). Finally ALLEGRO is presented, a MAS environment of support to the teaching/learning process that includes all previous artificial intelligence elements.
{"title":"ALLEGRO: Teaching/Learning Multi-Agent Environment using Instructional Planning and Cases- Based Reasoning (CBR)","authors":"R. M. Viccari, D. Ovalle, A. Jiménez","doi":"10.19153/CLEIEJ.10.1.4","DOIUrl":"https://doi.org/10.19153/CLEIEJ.10.1.4","url":null,"abstract":"This paper presents a description of the environments of individualized learning (Based on the Intelligent Tutoring Systems, ITS), the Computer Supported Collaborative Learning (CSCL), Multi-Agent Systems (MAS) and the artificial intelligence techniques called: Instructional Planning (IP) and Case-Based Reasoning (CBR). Finally ALLEGRO is presented, a MAS environment of support to the teaching/learning process that includes all previous artificial intelligence elements.","PeriodicalId":30032,"journal":{"name":"CLEI Electronic Journal","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2007-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67758205","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}
Sandra Souza Rodrigues, D. M. B. Paiva, Renata Pontin de Mattos Fortes
A new computational paradigm called the Internet of Things (IoT) has allowed various objects in our routine to communicate with each other. We can also observe that the global number of seniors with the effective potential to be its users grows, mainly dueto the increase in life expectancy. Then, the seniors can benefit from IoT technologies to achieve a better quality of life and healthy aging when these technologies consider accessibility and usability. This study aimed to better understand the main perceptionsof the seniors about the use of these IoT technologies, especially seeking to discover the expectations of these users to deal with them. Thus, 11 Brazilian seniors (over 60 years old) participated in interviews and, based on their responses, we carried out a thematic analysis. In this way, it was possible to analyze the narrations of the interviewees’ speeches and obtain their expectations to adopt IoT. As a consequence, we also developed and evaluated an IoT prototype to support seniors.
{"title":"Seniors' expectations to adopt IoT technologies","authors":"Sandra Souza Rodrigues, D. M. B. Paiva, Renata Pontin de Mattos Fortes","doi":"10.19153/cleiej.25.3.5","DOIUrl":"https://doi.org/10.19153/cleiej.25.3.5","url":null,"abstract":"A new computational paradigm called the Internet of Things (IoT) has allowed various objects in our routine to communicate with each other. We can also observe that the global number of seniors with the effective potential to be its users grows, mainly dueto the increase in life expectancy. Then, the seniors can benefit from IoT technologies to achieve a better quality of life and healthy aging when these technologies consider accessibility and usability. This study aimed to better understand the main perceptionsof the seniors about the use of these IoT technologies, especially seeking to discover the expectations of these users to deal with them. Thus, 11 Brazilian seniors (over 60 years old) participated in interviews and, based on their responses, we carried out a thematic analysis. In this way, it was possible to analyze the narrations of the interviewees’ speeches and obtain their expectations to adopt IoT. As a consequence, we also developed and evaluated an IoT prototype to support seniors.","PeriodicalId":30032,"journal":{"name":"CLEI Electronic Journal","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67758993","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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