The Experts below are selected from a list of 3975 Experts worldwide ranked by ideXlab platform
Shu-chuan Chen - One of the best experts on this subject based on the ideXlab platform.
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low cost direct fed slot antenna built in metal cover of Notebook Computer for 2 4 5 2 5 8 ghz wlan operation
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Cheng-tse Lee, Shu-chuan ChenAbstract:The slot antenna has been utilized for some recent Notebook Computers on the market. The FR4 substrates are usually required to print the metal patterns for coupled-feeding the 2.4 GHz (2400–2484 MHz) slot and also for contributing the 5.2 GHz (5150–5350 MHz) and 5.8 GHz (5725–5825 MHz) bands. This communication presents a simple, direct-fed slot antenna with a low profile of 7 mm to the top edge of the metal cover for 2.4-/5.2-/5.8-GHz WLAN operation. The antenna design did not require any substrate and can be implemented directly in the metal cover of a Notebook Computer at low cost. The design comprised two parallel-connected, 0.5-wavelength-slot portions, formed in a linear structure of length 79 mm and constant width 2 mm, and fed by a common antenna feed port using a mini-coaxial cable. The larger slot generated a 0.5-wavelength resonant mode in the 2.4-GHz band and a 1-wavelength mode for 5.2-GHz operation. The smaller slot operated in a 0.5-wavelength resonant mode, which covered the 5.8-GHz band. With a matching inductor properly set in the slot, good input impedance over the 2.4-, 5.2-, and 5.8-GHz bands can be attained.
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Low-Cost, Direct-Fed Slot Antenna Built in Metal Cover of Notebook Computer for 2.4-/5.2-/5.8-GHz WLAN Operation
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Cheng-tse Lee, Shu-chuan ChenAbstract:The slot antenna has been utilized for some recent Notebook Computers on the market. The FR4 substrates are usually required to print the metal patterns for coupled-feeding the 2.4 GHz (2400–2484 MHz) slot and also for contributing the 5.2 GHz (5150–5350 MHz) and 5.8 GHz (5725–5825 MHz) bands. This communication presents a simple, direct-fed slot antenna with a low profile of 7 mm to the top edge of the metal cover for 2.4-/5.2-/5.8-GHz WLAN operation. The antenna design did not require any substrate and can be implemented directly in the metal cover of a Notebook Computer at low cost. The design comprised two parallel-connected, 0.5-wavelength-slot portions, formed in a linear structure of length 79 mm and constant width 2 mm, and fed by a common antenna feed port using a mini-coaxial cable. The larger slot generated a 0.5-wavelength resonant mode in the 2.4-GHz band and a 1-wavelength mode for 5.2-GHz operation. The smaller slot operated in a 0.5-wavelength resonant mode, which covered the 5.8-GHz band. With a matching inductor properly set in the slot, good input impedance over the 2.4-, 5.2-, and 5.8-GHz bands can be attained.
Cheng-tse Lee - One of the best experts on this subject based on the ideXlab platform.
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low cost direct fed slot antenna built in metal cover of Notebook Computer for 2 4 5 2 5 8 ghz wlan operation
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Cheng-tse Lee, Shu-chuan ChenAbstract:The slot antenna has been utilized for some recent Notebook Computers on the market. The FR4 substrates are usually required to print the metal patterns for coupled-feeding the 2.4 GHz (2400–2484 MHz) slot and also for contributing the 5.2 GHz (5150–5350 MHz) and 5.8 GHz (5725–5825 MHz) bands. This communication presents a simple, direct-fed slot antenna with a low profile of 7 mm to the top edge of the metal cover for 2.4-/5.2-/5.8-GHz WLAN operation. The antenna design did not require any substrate and can be implemented directly in the metal cover of a Notebook Computer at low cost. The design comprised two parallel-connected, 0.5-wavelength-slot portions, formed in a linear structure of length 79 mm and constant width 2 mm, and fed by a common antenna feed port using a mini-coaxial cable. The larger slot generated a 0.5-wavelength resonant mode in the 2.4-GHz band and a 1-wavelength mode for 5.2-GHz operation. The smaller slot operated in a 0.5-wavelength resonant mode, which covered the 5.8-GHz band. With a matching inductor properly set in the slot, good input impedance over the 2.4-, 5.2-, and 5.8-GHz bands can be attained.
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Low-Cost, Direct-Fed Slot Antenna Built in Metal Cover of Notebook Computer for 2.4-/5.2-/5.8-GHz WLAN Operation
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Cheng-tse Lee, Shu-chuan ChenAbstract:The slot antenna has been utilized for some recent Notebook Computers on the market. The FR4 substrates are usually required to print the metal patterns for coupled-feeding the 2.4 GHz (2400–2484 MHz) slot and also for contributing the 5.2 GHz (5150–5350 MHz) and 5.8 GHz (5725–5825 MHz) bands. This communication presents a simple, direct-fed slot antenna with a low profile of 7 mm to the top edge of the metal cover for 2.4-/5.2-/5.8-GHz WLAN operation. The antenna design did not require any substrate and can be implemented directly in the metal cover of a Notebook Computer at low cost. The design comprised two parallel-connected, 0.5-wavelength-slot portions, formed in a linear structure of length 79 mm and constant width 2 mm, and fed by a common antenna feed port using a mini-coaxial cable. The larger slot generated a 0.5-wavelength resonant mode in the 2.4-GHz band and a 1-wavelength mode for 5.2-GHz operation. The smaller slot operated in a 0.5-wavelength resonant mode, which covered the 5.8-GHz band. With a matching inductor properly set in the slot, good input impedance over the 2.4-, 5.2-, and 5.8-GHz bands can be attained.
Karen Jacobs - One of the best experts on this subject based on the ideXlab platform.
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University students’ Notebook Computer use
Applied ergonomics, 2008Co-Authors: Karen Jacobs, Peter Johnson, Jack T. Dennerlein, Denise Peterson, Justin Kaufman, Joshua Gold, Sarah Williams, Nancy Richmond, Stephanie Karban, Emily FirnAbstract:Recent evidence suggests that university students are self-reporting experiencing musculoskeletal discomfort with Computer use similar to levels reported by adult workers. The objective of this study was to determine how university students use Notebook Computers and to determine what ergonomic strategies might be effective in reducing self-reported musculoskeletal discomfort in this population. Two hundred and eighty-nine university students randomly assigned to one of three towers by the university's Office of Housing participated in this study. The results of this investigation showed a significant reduction in self-reported Notebook Computer-related discomfort from pre- and post-survey in participants who received Notebook Computer accessories and in those who received accessories and participatory ergonomics training. A significant increase in post-survey rest breaks was seen. There was a significant correlation between self-reported Computer usage and the amount measured using Computer usage software (odometer). More research is needed however to determine the most effective ergonomics intervention for university students.
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University Students' Notebook Computer Use
Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 2008Co-Authors: Karen JacobsAbstract:University students are self-reporting musculoskeletal discomfort with Computer use similar to levels reported by adult workers. The objective of this research study was to determine how university students use Notebook Computers and to determine what ergonomic strategies might be effective in reducing their self-reported musculoskeletal discomfort. Two hundred and eighty-nine university students, who were randomly assigned to one of three conditions, participated in this study. Participants who received Notebook Computer accessories and those who received these accessories and participatory ergonomics training reported a significant reduction in self-reported Notebook Computer-related discomfort. A significant increase in rest breaks occurred with a significant correlation between self-reported Computer usage and the amount measured using WorkPace®, a Computer usage software.
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Middle School Students' Notebook Computer Use
Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 2007Co-Authors: Karen Jacobs, Kathryn RungeAbstract:This pilot study investigated how middle school students use Notebook Computers in their daily activities, their knowledge and beliefs about ergonomics, the prevalence of self-reported musculoskeletal discomfort in Notebook Computer use and if the use of peripherals, a participatory ergonomics approach or goal setting is effective in promoting “healthy computing” and reducing self-reported Computer-related musculoskeletal discomfort. One hundred and twenty four students were recruited from three middle schools in Maine to participate in the study for three months. Pilot results suggest that over 26% of the students self-report musculoskeletal discomfort with Notebook Computer use. Students who self-reported general discomfort typed significantly faster as compared to students who typed at a slower average weekly rate. Participatory ergonomics training that involved the participants in planning, developing, and implementing ergonomic solutions to Notebook Computer workstations and the use of peripherals, i...
Michael Pecht - One of the best experts on this subject based on the ideXlab platform.
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Anomaly detection of Notebook Computer based on Weibull decision metrics
2010 Prognostics and System Health Management Conference, 2010Co-Authors: Gang Niu, Satnam Singh, Steven W. Holland, Michael PechtAbstract:This paper presents a approach for anomaly detection of electronic products using the Mahalanobis Distance (MD) and Weibull distribution. The MD value is used as a health index, which has the advantage of both summarizing the multivariate operating parameters and reducing the data set into a univariate distance index. The Weibull distribution is used to determine health decision metrics, which are useful in characterizing distributions of MD values. Furthermore, a case study of the proposed Notebook Computer anomaly detection method is carried out. The experimental results show that the proposed method is valuable.
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in situ temperature measurement of a Notebook Computer a case study in health and usage monitoring of electronics
IEEE Transactions on Device and Materials Reliability, 2004Co-Authors: Nikhil M Vichare, Peter Rodgers, Valerie Eveloy, Michael PechtAbstract:Reliability prediction methods do not generally account for the actual life cycle environment of electronic products, which covers their environmental, operating and usage conditions. Considering thermal loads, thermal management strategies still focus on a design for continuous operation that is often determined based on an accumulation of worst-case assumptions. Health monitoring is a method of assessing the reliability of a product in its actual application conditions. A case study in health and usage monitoring of electronic products is presented for a commercial Notebook Computer. Internal temperatures were dynamically monitored in situ and statistically analyzed during all phases of the life cycle, including usage, storage, and transportation. The effects of power cycles, usage history, CPU computing resources usage, and external thermal environment on peak transient thermal loads were characterized. Such monitored life cycle temperature data could be applied in a life consumption monitoring methodology, to provide damage estimation and remaining life prediction due to specific failure mechanisms influenced by temperature. These findings could contribute to the design of more sustainable, least-energy consumption thermal management solutions.
Emily Firn - One of the best experts on this subject based on the ideXlab platform.
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University students’ Notebook Computer use
Applied ergonomics, 2008Co-Authors: Karen Jacobs, Peter Johnson, Jack T. Dennerlein, Denise Peterson, Justin Kaufman, Joshua Gold, Sarah Williams, Nancy Richmond, Stephanie Karban, Emily FirnAbstract:Recent evidence suggests that university students are self-reporting experiencing musculoskeletal discomfort with Computer use similar to levels reported by adult workers. The objective of this study was to determine how university students use Notebook Computers and to determine what ergonomic strategies might be effective in reducing self-reported musculoskeletal discomfort in this population. Two hundred and eighty-nine university students randomly assigned to one of three towers by the university's Office of Housing participated in this study. The results of this investigation showed a significant reduction in self-reported Notebook Computer-related discomfort from pre- and post-survey in participants who received Notebook Computer accessories and in those who received accessories and participatory ergonomics training. A significant increase in post-survey rest breaks was seen. There was a significant correlation between self-reported Computer usage and the amount measured using Computer usage software (odometer). More research is needed however to determine the most effective ergonomics intervention for university students.
