The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
S Bitew - One of the best experts on this subject based on the ideXlab platform.
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the lifebox surgical Headlight project engineering testing and field assessment in a resource constrained setting
British Journal of Surgery, 2020Co-Authors: Nichole Starr, Nikhil Panda, E W Johansen, Jared A Forrester, Ebisa Wayessa, D Rebollo, A August, K Fernandez, S BitewAbstract:BACKGROUND Poor surgical lighting represents a major patient safety issue in low-income countries. This study evaluated device performance and undertook field assessment of high-quality Headlights in Ethiopia to identify critical attributes that might improve safety and encourage local use. METHODS Following an open call for submissions (December 2018 to January 2019), medical and technical (non-medical) Headlights were identified for controlled specification testing on 14 prespecified parameters related to light quality/intensity, mounting and battery performance, including standardized illuminance measurements over time. The five highest-performing devices (differential illumination, colour rendering, spot size, mounting and battery duration) were distributed to eight Ethiopian surgeons working in resource-constrained facilities. Surgeons evaluated the devices in operating rooms, and in a comparative session rated each Headlight in terms of performance and willingness to purchase. RESULTS Of 25 submissions, eight Headlights (6 surgical and 2 technical) met the criteria for full specification testing. Scores ranged from 8 to 12 (of 14), with differential performance in lighting, mounting and battery domains. Only two Headlights met the illuminance parameters of more than 35 000 lux during initial testing, and no Headlight satisfied all minimum specifications. Of the five Headlights evaluated in Ethiopia, daily operation logbooks noted variability in surgeons' opinions of lighting quality (6-92 per cent) and spot size (0-92 per cent). Qualitative interviews also yielded important feedback, including preference for easy transport. Surgeons sought high quality with price sensitivity (using out-of-pocket funds) and identified the least expensive but high-functioning device as their first choice. CONCLUSION No device satisfied all the predetermined specifications, and large price discrepancies were critical factors leading surgeons' choices. The favoured device is undergoing modification by the manufacturer based on design feedback so an affordable, high-quality surgical Headlight crafted specifically for the needs of resource-constrained settings can be used to improve surgical safety.
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the lifebox surgical Headlight project engineering testing and field assessment in a resource constrained setting
British Journal of Surgery, 2020Co-Authors: Nichole Starr, Nikhil Panda, E W Johansen, Jared A Forrester, Ebisa Wayessa, D Rebollo, A August, K Fernandez, S BitewAbstract:BACKGROUND Poor surgical lighting represents a major patient safety issue in low-income countries. This study evaluated device performance and undertook field assessment of high-quality Headlights in Ethiopia to identify critical attributes that might improve safety and encourage local use. METHODS Following an open call for submissions (December 2018 to January 2019), medical and technical (non-medical) Headlights were identified for controlled specification testing on 14 prespecified parameters related to light quality/intensity, mounting and battery performance, including standardized illuminance measurements over time. The five highest-performing devices (differential illumination, colour rendering, spot size, mounting and battery duration) were distributed to eight Ethiopian surgeons working in resource-constrained facilities. Surgeons evaluated the devices in operating rooms, and in a comparative session rated each Headlight in terms of performance and willingness to purchase. RESULTS Of 25 submissions, eight Headlights (6 surgical and 2 technical) met the criteria for full specification testing. Scores ranged from 8 to 12 (of 14), with differential performance in lighting, mounting and battery domains. Only two Headlights met the illuminance parameters of more than 35 000 lux during initial testing, and no Headlight satisfied all minimum specifications. Of the five Headlights evaluated in Ethiopia, daily operation logbooks noted variability in surgeons' opinions of lighting quality (6-92 per cent) and spot size (0-92 per cent). Qualitative interviews also yielded important feedback, including preference for easy transport. Surgeons sought high quality with price sensitivity (using out-of-pocket funds) and identified the least expensive but high-functioning device as their first choice. CONCLUSION No device satisfied all the predetermined specifications, and large price discrepancies were critical factors leading surgeons' choices. The favoured device is undergoing modification by the manufacturer based on design feedback so an affordable, high-quality surgical Headlight crafted specifically for the needs of resource-constrained settings can be used to improve surgical safety.
Nikhil Panda - One of the best experts on this subject based on the ideXlab platform.
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the lifebox surgical Headlight project engineering testing and field assessment in a resource constrained setting
British Journal of Surgery, 2020Co-Authors: Nichole Starr, Nikhil Panda, E W Johansen, Jared A Forrester, Ebisa Wayessa, D Rebollo, A August, K Fernandez, S BitewAbstract:BACKGROUND Poor surgical lighting represents a major patient safety issue in low-income countries. This study evaluated device performance and undertook field assessment of high-quality Headlights in Ethiopia to identify critical attributes that might improve safety and encourage local use. METHODS Following an open call for submissions (December 2018 to January 2019), medical and technical (non-medical) Headlights were identified for controlled specification testing on 14 prespecified parameters related to light quality/intensity, mounting and battery performance, including standardized illuminance measurements over time. The five highest-performing devices (differential illumination, colour rendering, spot size, mounting and battery duration) were distributed to eight Ethiopian surgeons working in resource-constrained facilities. Surgeons evaluated the devices in operating rooms, and in a comparative session rated each Headlight in terms of performance and willingness to purchase. RESULTS Of 25 submissions, eight Headlights (6 surgical and 2 technical) met the criteria for full specification testing. Scores ranged from 8 to 12 (of 14), with differential performance in lighting, mounting and battery domains. Only two Headlights met the illuminance parameters of more than 35 000 lux during initial testing, and no Headlight satisfied all minimum specifications. Of the five Headlights evaluated in Ethiopia, daily operation logbooks noted variability in surgeons' opinions of lighting quality (6-92 per cent) and spot size (0-92 per cent). Qualitative interviews also yielded important feedback, including preference for easy transport. Surgeons sought high quality with price sensitivity (using out-of-pocket funds) and identified the least expensive but high-functioning device as their first choice. CONCLUSION No device satisfied all the predetermined specifications, and large price discrepancies were critical factors leading surgeons' choices. The favoured device is undergoing modification by the manufacturer based on design feedback so an affordable, high-quality surgical Headlight crafted specifically for the needs of resource-constrained settings can be used to improve surgical safety.
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the lifebox surgical Headlight project engineering testing and field assessment in a resource constrained setting
British Journal of Surgery, 2020Co-Authors: Nichole Starr, Nikhil Panda, E W Johansen, Jared A Forrester, Ebisa Wayessa, D Rebollo, A August, K Fernandez, S BitewAbstract:BACKGROUND Poor surgical lighting represents a major patient safety issue in low-income countries. This study evaluated device performance and undertook field assessment of high-quality Headlights in Ethiopia to identify critical attributes that might improve safety and encourage local use. METHODS Following an open call for submissions (December 2018 to January 2019), medical and technical (non-medical) Headlights were identified for controlled specification testing on 14 prespecified parameters related to light quality/intensity, mounting and battery performance, including standardized illuminance measurements over time. The five highest-performing devices (differential illumination, colour rendering, spot size, mounting and battery duration) were distributed to eight Ethiopian surgeons working in resource-constrained facilities. Surgeons evaluated the devices in operating rooms, and in a comparative session rated each Headlight in terms of performance and willingness to purchase. RESULTS Of 25 submissions, eight Headlights (6 surgical and 2 technical) met the criteria for full specification testing. Scores ranged from 8 to 12 (of 14), with differential performance in lighting, mounting and battery domains. Only two Headlights met the illuminance parameters of more than 35 000 lux during initial testing, and no Headlight satisfied all minimum specifications. Of the five Headlights evaluated in Ethiopia, daily operation logbooks noted variability in surgeons' opinions of lighting quality (6-92 per cent) and spot size (0-92 per cent). Qualitative interviews also yielded important feedback, including preference for easy transport. Surgeons sought high quality with price sensitivity (using out-of-pocket funds) and identified the least expensive but high-functioning device as their first choice. CONCLUSION No device satisfied all the predetermined specifications, and large price discrepancies were critical factors leading surgeons' choices. The favoured device is undergoing modification by the manufacturer based on design feedback so an affordable, high-quality surgical Headlight crafted specifically for the needs of resource-constrained settings can be used to improve surgical safety.
Eli Peli - One of the best experts on this subject based on the ideXlab platform.
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Development of a Headlight glare simulator for a driving simulator
Transportation research. Part C Emerging technologies, 2013Co-Authors: Alex D. Hwang, Eli PeliAbstract:We describe the design and construction of a Headlight glare simulator to be used with a driving simulator. The system combines a modified programmable off-the-shelf LED display board and a beamsplitter so that the LED lights, representing the Headlights of oncoming cars, are superimposed over the driving simulator Headlights image. Ideal spatial arrangement of optical components to avoid misalignments of the superimposed images is hard to achieve in practice and variations inevitably introduce some parallax. Furthermore, the driver's viewing position varies with driver's height and seating position preferences exacerbate such misalignment. We reduce the parallax errors using an intuitive calibration procedure (simple drag-and-drop alignment of nine LED positions with calibration dots on the screen). To simulate the dynamics of Headlight brightness changes when two vehicles are approaching, LED intensity control algorithms based on both Headlight and LED beam shapes were developed. The simulation errors were estimated and compared to real-world Headlight brightness variability.
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Development of a Headlight glare simulator for a driving simulator
Transportation research. Part C Emerging technologies, 2013Co-Authors: Alex D. Hwang, Eli PeliAbstract:We describe the design and construction of a Headlight glare simulator to be used with a driving simulator. The system combines a modified programmable off-the-shelf LED display board and a beamsplitter so that the LED lights, representing the Headlights of oncoming cars, are superimposed over the driving simulator Headlight images. Ideal spatial arrangement of optical components to avoid misalignments of the superimposed images is hard to achieve in practice, and variations inevitably introduce some parallax. Furthermore, driver’s viewing position varies with driver height and seating position preferences, exacerbating misalignment. We reduce the parallax errors using an intuitive calibration procedure (a simple drag-and-drop alignment of nine LED positions with calibration dots on the screen). To simulate the dynamics of Headlight brightness changes when two vehicles are approaching, LED intensity control algorithms based on both Headlight and LED beam shapes were developed. The simulation errors were estimated and compared favorably with real-world Headlight brightness variability.
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Headlight GLARE SIMULATOR FOR A DRIVING SIMULATOR 2.0
2011Co-Authors: Alex Hwang, Eli PeliAbstract:In this paper, the authors would like to introduce a second generation of Headlight glare simulator to be used with a driving simulator that significantly improves spatial and brightness accuracy of previously developed prototype Headlight glare simulator (Fullerton & Peli, 2009). The system combined a programmable off–the-shelf light emitting diodes (LED) display board and a beamsplitter so that the LED lights, representing Headlights of oncoming cars, are superimposed over the driving simulator screen. Although the early prototype Headlight glare simulator proved the feasibility of the concept, it required precise spatial arrangement of optical components to avoid misalignments of the superimposed images. Due to the spatial limitations of the driving simulator, this ideal set up is hard to achieve in practice and the use of a 2-dimensional beamsplitter plate inevitably introduces parallax. Furthermore, the driver’s viewing position varies by driver based on the driver’s height and seating position preferences, and this exacerbates the misalignment. In order to minimize the resulting parallax errors, the new glare simulator the authors report on here has an intuitive calibration procedure (simple drag-and-drop alignment of nine calibration dots on the screen) which defines a set of mapping coefficients for each driver and reduces overall parallax error. In addition to the improvements of spatial synchronization, in order to simulate the dynamics of Headlight brightness changes during nighttime driving, a new LED intensity control algorithms based on Headlight and LED beam shapes were developed and validated.
Nichole Starr - One of the best experts on this subject based on the ideXlab platform.
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the lifebox surgical Headlight project engineering testing and field assessment in a resource constrained setting
British Journal of Surgery, 2020Co-Authors: Nichole Starr, Nikhil Panda, E W Johansen, Jared A Forrester, Ebisa Wayessa, D Rebollo, A August, K Fernandez, S BitewAbstract:BACKGROUND Poor surgical lighting represents a major patient safety issue in low-income countries. This study evaluated device performance and undertook field assessment of high-quality Headlights in Ethiopia to identify critical attributes that might improve safety and encourage local use. METHODS Following an open call for submissions (December 2018 to January 2019), medical and technical (non-medical) Headlights were identified for controlled specification testing on 14 prespecified parameters related to light quality/intensity, mounting and battery performance, including standardized illuminance measurements over time. The five highest-performing devices (differential illumination, colour rendering, spot size, mounting and battery duration) were distributed to eight Ethiopian surgeons working in resource-constrained facilities. Surgeons evaluated the devices in operating rooms, and in a comparative session rated each Headlight in terms of performance and willingness to purchase. RESULTS Of 25 submissions, eight Headlights (6 surgical and 2 technical) met the criteria for full specification testing. Scores ranged from 8 to 12 (of 14), with differential performance in lighting, mounting and battery domains. Only two Headlights met the illuminance parameters of more than 35 000 lux during initial testing, and no Headlight satisfied all minimum specifications. Of the five Headlights evaluated in Ethiopia, daily operation logbooks noted variability in surgeons' opinions of lighting quality (6-92 per cent) and spot size (0-92 per cent). Qualitative interviews also yielded important feedback, including preference for easy transport. Surgeons sought high quality with price sensitivity (using out-of-pocket funds) and identified the least expensive but high-functioning device as their first choice. CONCLUSION No device satisfied all the predetermined specifications, and large price discrepancies were critical factors leading surgeons' choices. The favoured device is undergoing modification by the manufacturer based on design feedback so an affordable, high-quality surgical Headlight crafted specifically for the needs of resource-constrained settings can be used to improve surgical safety.
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the lifebox surgical Headlight project engineering testing and field assessment in a resource constrained setting
British Journal of Surgery, 2020Co-Authors: Nichole Starr, Nikhil Panda, E W Johansen, Jared A Forrester, Ebisa Wayessa, D Rebollo, A August, K Fernandez, S BitewAbstract:BACKGROUND Poor surgical lighting represents a major patient safety issue in low-income countries. This study evaluated device performance and undertook field assessment of high-quality Headlights in Ethiopia to identify critical attributes that might improve safety and encourage local use. METHODS Following an open call for submissions (December 2018 to January 2019), medical and technical (non-medical) Headlights were identified for controlled specification testing on 14 prespecified parameters related to light quality/intensity, mounting and battery performance, including standardized illuminance measurements over time. The five highest-performing devices (differential illumination, colour rendering, spot size, mounting and battery duration) were distributed to eight Ethiopian surgeons working in resource-constrained facilities. Surgeons evaluated the devices in operating rooms, and in a comparative session rated each Headlight in terms of performance and willingness to purchase. RESULTS Of 25 submissions, eight Headlights (6 surgical and 2 technical) met the criteria for full specification testing. Scores ranged from 8 to 12 (of 14), with differential performance in lighting, mounting and battery domains. Only two Headlights met the illuminance parameters of more than 35 000 lux during initial testing, and no Headlight satisfied all minimum specifications. Of the five Headlights evaluated in Ethiopia, daily operation logbooks noted variability in surgeons' opinions of lighting quality (6-92 per cent) and spot size (0-92 per cent). Qualitative interviews also yielded important feedback, including preference for easy transport. Surgeons sought high quality with price sensitivity (using out-of-pocket funds) and identified the least expensive but high-functioning device as their first choice. CONCLUSION No device satisfied all the predetermined specifications, and large price discrepancies were critical factors leading surgeons' choices. The favoured device is undergoing modification by the manufacturer based on design feedback so an affordable, high-quality surgical Headlight crafted specifically for the needs of resource-constrained settings can be used to improve surgical safety.
Alex D. Hwang - One of the best experts on this subject based on the ideXlab platform.
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Development of a Headlight glare simulator for a driving simulator
Transportation research. Part C Emerging technologies, 2013Co-Authors: Alex D. Hwang, Eli PeliAbstract:We describe the design and construction of a Headlight glare simulator to be used with a driving simulator. The system combines a modified programmable off-the-shelf LED display board and a beamsplitter so that the LED lights, representing the Headlights of oncoming cars, are superimposed over the driving simulator Headlights image. Ideal spatial arrangement of optical components to avoid misalignments of the superimposed images is hard to achieve in practice and variations inevitably introduce some parallax. Furthermore, the driver's viewing position varies with driver's height and seating position preferences exacerbate such misalignment. We reduce the parallax errors using an intuitive calibration procedure (simple drag-and-drop alignment of nine LED positions with calibration dots on the screen). To simulate the dynamics of Headlight brightness changes when two vehicles are approaching, LED intensity control algorithms based on both Headlight and LED beam shapes were developed. The simulation errors were estimated and compared to real-world Headlight brightness variability.
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Development of a Headlight glare simulator for a driving simulator
Transportation research. Part C Emerging technologies, 2013Co-Authors: Alex D. Hwang, Eli PeliAbstract:We describe the design and construction of a Headlight glare simulator to be used with a driving simulator. The system combines a modified programmable off-the-shelf LED display board and a beamsplitter so that the LED lights, representing the Headlights of oncoming cars, are superimposed over the driving simulator Headlight images. Ideal spatial arrangement of optical components to avoid misalignments of the superimposed images is hard to achieve in practice, and variations inevitably introduce some parallax. Furthermore, driver’s viewing position varies with driver height and seating position preferences, exacerbating misalignment. We reduce the parallax errors using an intuitive calibration procedure (a simple drag-and-drop alignment of nine LED positions with calibration dots on the screen). To simulate the dynamics of Headlight brightness changes when two vehicles are approaching, LED intensity control algorithms based on both Headlight and LED beam shapes were developed. The simulation errors were estimated and compared favorably with real-world Headlight brightness variability.
