Pub Date : 2019-12-31DOI: 10.25073/JAEC.201934.262
Buu-Chau Truong, Van-Buol Nguyen, Hoang-Vinh Truong, T. Ho
Our main goal in this article is to present the approaches and examples of three functions in R consist of optim, nleqslv and maxLik function to detect the optimization solution of the estimating function in the regression models. We then compare the results with numerous sample sizes (n=150, 300 and 500), the execution time of R code, as well as Normal Q Q plots of three approaches through some of regression models such as the zeroin ated Binomial (ZIB) regression model, logistic regression model, the zero-in ated Poisson (ZIP) regression model and the zero-in ated Bernoulli (ZIBer) regression model. Finally, we discuss potential research directions in the coming times.
{"title":"Comparison of Optim, Nleqslv and MaxLik to Estimate Parameters in Some of Regression Models","authors":"Buu-Chau Truong, Van-Buol Nguyen, Hoang-Vinh Truong, T. Ho","doi":"10.25073/JAEC.201934.262","DOIUrl":"https://doi.org/10.25073/JAEC.201934.262","url":null,"abstract":"Our main goal in this article is to present the approaches and examples of three functions in R consist of optim, nleqslv and maxLik function to detect the optimization solution of the estimating function in the regression models. We then compare the results with numerous sample sizes (n=150, 300 and 500), the execution time of R code, as well as Normal Q Q plots of three approaches through some of regression models such as the zeroin ated Binomial (ZIB) regression model, logistic regression model, the zero-in ated Poisson (ZIP) regression model and the zero-in ated Bernoulli (ZIBer) regression model. Finally, we discuss potential research directions in the coming times.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123320825","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 : 2019-12-31DOI: 10.25073/jaec.201934.271
R. Velpula, B. Jain, H. Bui, H. Nguyen
III-nitride nanowire based lightemitting diodes (LEDs) have been intensively studied as promising candidates for future lighting technologies. Compared to conventional GaN-based planar LEDs, III-nitride nanowire LEDs exhibit numerous advantages including greatly reduced dislocation densities, polarization elds, and quantum-con ned Stark e ect due to the e ective lateral stress relaxation, promising high e ciency full-color LEDs. Beside these advantages, however, several issues have been identi ed as the limiting factors for further enhancing the nanowire LED quantum e ciency and light output power. Some of the most probable causes have been identi ed as due to the lack of carrier con nement in the active region, non-uniform carrier distribution, electron over ow, and the nonradiative recombination along the nanowire lateral surfaces. Moreover, the presence of large surface states and defects contribute signi cantly to the carrier loss in nanowire LEDs. Consequently, reported nanowire LEDs show relatively low output power. Recently, III-nitride core-shell nanowire LED structures have been reported as the most e cient nanowire white LEDs with a record high output power which is more than 500 times stronger than that of nanowire white LEDs without using core-shell structure. In this context, we will review the current status, challenges and approaches for the high performance IIInitride nanowire LEDs. More speci cally, we will describe the current methods for the fabrication of nanowire structures including top-down and bottom-up approaches, followed by characteristics of III-nitride nanowire LEDs. We will then discuss the carrier dynamics and loss mechanism in nanowire LEDs. The typical designs for the enhanced performance of III-nitride nanowire LEDs will be presented next. The color tunable nanowire LEDs with emission wavelengths in the visible spectrum, and phosphorfree nanowire white LEDs will be nally discussed.
{"title":"Full-Color III-Nitride Nanowire Light-Emitting Diodes","authors":"R. Velpula, B. Jain, H. Bui, H. Nguyen","doi":"10.25073/jaec.201934.271","DOIUrl":"https://doi.org/10.25073/jaec.201934.271","url":null,"abstract":"III-nitride nanowire based lightemitting diodes (LEDs) have been intensively studied as promising candidates for future lighting technologies. Compared to conventional GaN-based planar LEDs, III-nitride nanowire LEDs exhibit numerous advantages including greatly reduced dislocation densities, polarization elds, and quantum-con ned Stark e ect due to the e ective lateral stress relaxation, promising high e ciency full-color LEDs. Beside these advantages, however, several issues have been identi ed as the limiting factors for further enhancing the nanowire LED quantum e ciency and light output power. Some of the most probable causes have been identi ed as due to the lack of carrier con nement in the active region, non-uniform carrier distribution, electron over ow, and the nonradiative recombination along the nanowire lateral surfaces. Moreover, the presence of large surface states and defects contribute signi cantly to the carrier loss in nanowire LEDs. Consequently, reported nanowire LEDs show relatively low output power. Recently, III-nitride core-shell nanowire LED structures have been reported as the most e cient nanowire white LEDs with a record high output power which is more than 500 times stronger than that of nanowire white LEDs without using core-shell structure. In this context, we will review the current status, challenges and approaches for the high performance IIInitride nanowire LEDs. More speci cally, we will describe the current methods for the fabrication of nanowire structures including top-down and bottom-up approaches, followed by characteristics of III-nitride nanowire LEDs. We will then discuss the carrier dynamics and loss mechanism in nanowire LEDs. The typical designs for the enhanced performance of III-nitride nanowire LEDs will be presented next. The color tunable nanowire LEDs with emission wavelengths in the visible spectrum, and phosphorfree nanowire white LEDs will be nally discussed.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117252613","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 : 2019-09-30DOI: 10.25073/jaec.201933.254
Van Huynh-Van, T. Tran
Piezoelectric bimorph actuators have been employed in several applications. In this paper, the piezoelectric actuator is discretized and its hysteresis function is studied, then a digital sliding mode controller is designed. Furthermore, a perturbation estimation technique is applied and an observer is no longer needed. In addition, simulations are performed also using the traditional PID controller in order to validate the proposed controller scheme performance.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"Discrete Sliding Mode Control Design for Piezoelectric Actuator","authors":"Van Huynh-Van, T. Tran","doi":"10.25073/jaec.201933.254","DOIUrl":"https://doi.org/10.25073/jaec.201933.254","url":null,"abstract":"Piezoelectric bimorph actuators have been employed in several applications. In this paper, the piezoelectric actuator is discretized and its hysteresis function is studied, then a digital sliding mode controller is designed. Furthermore, a perturbation estimation technique is applied and an observer is no longer needed. In addition, simulations are performed also using the traditional PID controller in order to validate the proposed controller scheme performance.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited. ","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121072699","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 : 2019-09-30DOI: 10.25073/jaec.201933.252
T. Nguyen, Hung Le, Long Duong, C. Pham, Dung Lê
Preserving, maintaining and teaching traditional martial arts are very important activities in social life. That helps preserve national culture, exercise and self-defense for practitioners. However, traditional martial arts have many different postures and activities of the body and body parts are diverse. The problem of estimating the actions of the human body still has many challenges, such as accuracy, obscurity, etc. In this paper, we survey several strong studies in the recent years for 3-D human pose estimation. Statistical tables have been compiled for years, typical results of these studies on the Human 3.6m dataset have been summarized. We also present a comparative study for 3-D human pose estimation based on the method that uses a single image. This study based on the methods that use the Convolutional Neural Network (CNN) for 2-D pose estimation, and then using 3-D pose library for mapping the 2-D results into the 3-D space. The CNNs model is trained on the benchmark datasets as MSCOCO Keypoints Challenge dataset [1], Human 3.6m [2], MPII dataset [3], LSP [4], [5], etc. We final publish the dataset of Vietnamese's traditional martial arts in Binh Dinh province for evaluating the 3-D human pose estimation. Quantitative results are presented and evaluated.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"3D Human Pose Estimation in Vietnamese Traditional Martial Art Videos","authors":"T. Nguyen, Hung Le, Long Duong, C. Pham, Dung Lê","doi":"10.25073/jaec.201933.252","DOIUrl":"https://doi.org/10.25073/jaec.201933.252","url":null,"abstract":"Preserving, maintaining and teaching traditional martial arts are very important activities in social life. That helps preserve national culture, exercise and self-defense for practitioners. However, traditional martial arts have many different postures and activities of the body and body parts are diverse. The problem of estimating the actions of the human body still has many challenges, such as accuracy, obscurity, etc. In this paper, we survey several strong studies in the recent years for 3-D human pose estimation. Statistical tables have been compiled for years, typical results of these studies on the Human 3.6m dataset have been summarized. We also present a comparative study for 3-D human pose estimation based on the method that uses a single image. This study based on the methods that use the Convolutional Neural Network (CNN) for 2-D pose estimation, and then using 3-D pose library for mapping the 2-D results into the 3-D space. The CNNs model is trained on the benchmark datasets as MSCOCO Keypoints Challenge dataset [1], Human 3.6m [2], MPII dataset [3], LSP [4], [5], etc. We final publish the dataset of Vietnamese's traditional martial arts in Binh Dinh province for evaluating the 3-D human pose estimation. Quantitative results are presented and evaluated.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited. ","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126283003","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 : 2019-09-30DOI: 10.25073/jaec.201933.247
Michal Bukácek
Today's world is full of new, small, personal handhelds. They are called smartphones or tablets. The machines themselves always have less power than desktop computers or even mainframes which were left behind. Their computational power can be increased when they are joined together in a group and are addressing one common task. To check and demonstrate the possibility of the use of mobile devices being joined to a group, the SOMA algorithm was chosen. The well as known functions, for example; De Jong, Rosenbrock, Rastrigin or Schwefel will be used and their extremes (minimums) will be realized. The goal is to test the speed of these mobile devices to realize the extremes of more dimensional functions. The advantages and disadvantages of this swarm linking will be shown. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"On SOMA Parallelization with Android Devices","authors":"Michal Bukácek","doi":"10.25073/jaec.201933.247","DOIUrl":"https://doi.org/10.25073/jaec.201933.247","url":null,"abstract":"Today's world is full of new, small, personal handhelds. They are called smartphones or tablets. The machines themselves always have less power than desktop computers or even mainframes which were left behind. Their computational power can be increased when they are joined together in a group and are addressing one common task. To check and demonstrate the possibility of the use of mobile devices being joined to a group, the SOMA algorithm was chosen. The well as known functions, for example; De Jong, Rosenbrock, Rastrigin or Schwefel will be used and their extremes (minimums) will be realized. The goal is to test the speed of these mobile devices to realize the extremes of more dimensional functions. The advantages and disadvantages of this swarm linking will be shown. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114640304","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 : 2019-09-30DOI: 10.25073/jaec.201933.250
Hsiao-Yi Lee, P. X. Le, Doan Quoc Anh Nguyen
In terms of luminous flux, the remote phosphor structure is better than conformal structure or in-cup phosphor structure, however, this structure often has inferior color quality compared to the others. As a result, many studies have been conducted to nd a solution to the drawback mentioned above. In this research, we are after the same goal using WLEDs structure with color temperature of 5600 K and come to the conclusion that dual-layer phosphor structure can improve the color rendering index (CRI) and the color quality scale (CQS). The concept of the research is to place red phosphor layer Mg2TiO4:Mn4+ on a yellow phosphor layer YAG:Ce3+ and locate the concentration of Mg2TiO4:Mn4+ that allows the color quality to reach the highest value. The result shows that Mg2TiO4:Mn4+ benets CRI and CQS, more specifically, the addition of Mg2TiO4:Mn4+ in WLEDs boosts the red light component, thus, enhancing CRI and CQS. However, it is demonstrated through the application of Mie-scattering theory and Lambert-Beer law that when the concentration of Mg2TiO4:Mn4+ exceed the limit, it can harm the luminous flux of WLEDs. The result of this research is a valuable contribution to improving the techniques of manufacturing better WLEDs with higher white light quality. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"The Impacts of Red-emitting Mg2TiO4: Mn4+ Phosphor on Color Quality of Dual-layer Remote Phosphor Configuration","authors":"Hsiao-Yi Lee, P. X. Le, Doan Quoc Anh Nguyen","doi":"10.25073/jaec.201933.250","DOIUrl":"https://doi.org/10.25073/jaec.201933.250","url":null,"abstract":"In terms of luminous flux, the remote phosphor structure is better than conformal structure or in-cup phosphor structure, however, this structure often has inferior color quality compared to the others. As a result, many studies have been conducted to nd a solution to the drawback mentioned above. In this research, we are after the same goal using WLEDs structure with color temperature of 5600 K and come to the conclusion that dual-layer phosphor structure can improve the color rendering index (CRI) and the color quality scale (CQS). The concept of the research is to place red phosphor layer Mg2TiO4:Mn4+ on a yellow phosphor layer YAG:Ce3+ and locate the concentration of Mg2TiO4:Mn4+ that allows the color quality to reach the highest value. The result shows that Mg2TiO4:Mn4+ benets CRI and CQS, more specifically, the addition of Mg2TiO4:Mn4+ in WLEDs boosts the red light component, thus, enhancing CRI and CQS. However, it is demonstrated through the application of Mie-scattering theory and Lambert-Beer law that when the concentration of Mg2TiO4:Mn4+ exceed the limit, it can harm the luminous flux of WLEDs. The result of this research is a valuable contribution to improving the techniques of manufacturing better WLEDs with higher white light quality. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133583455","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 : 2019-09-30DOI: 10.25073/jaec.201933.248
D. Dinh-Cong, Linh Vo-Van, Dung Nguyen-Quoc, T. Nguyen-Thoi
Modal kinetic energy (MKE) feature has been mostly employed for optimal sensor layout strategies; nevertheless, little attention is paid to use the feature to the field of structural damage detection. The article presents the extensive applicability of MKE change ratio (MKECR), a good damage sensitive parameter, to damage localization and quantification of laminated composite beams. The formulation of the parameter is based on the closed-form of element MKE sensitivity. The performance of the offered damage detection method is numerically verified by a clamped-clamped composite beam and a two-span continuous composite beam with different hypothetical damage scenarios. The influence of incomplete mode shapes, various noise levels as well as damage magnitudes on damage prediction results are also investigated. The obtained results from these numerical examples indicate that the offered method reliably localize the actually damaged elements and approximately estimate their severities, even under incomplete measurements at a high noise level.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"Modal Kinetic Energy Change Ratio-based Damage Assessment of Laminated Composite Beams using Noisy and Incomplete Measurements","authors":"D. Dinh-Cong, Linh Vo-Van, Dung Nguyen-Quoc, T. Nguyen-Thoi","doi":"10.25073/jaec.201933.248","DOIUrl":"https://doi.org/10.25073/jaec.201933.248","url":null,"abstract":"Modal kinetic energy (MKE) feature has been mostly employed for optimal sensor layout strategies; nevertheless, little attention is paid to use the feature to the field of structural damage detection. The article presents the extensive applicability of MKE change ratio (MKECR), a good damage sensitive parameter, to damage localization and quantification of laminated composite beams. The formulation of the parameter is based on the closed-form of element MKE sensitivity. The performance of the offered damage detection method is numerically verified by a clamped-clamped composite beam and a two-span continuous composite beam with different hypothetical damage scenarios. The influence of incomplete mode shapes, various noise levels as well as damage magnitudes on damage prediction results are also investigated. The obtained results from these numerical examples indicate that the offered method reliably localize the actually damaged elements and approximately estimate their severities, even under incomplete measurements at a high noise level.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited. ","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"127 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114162958","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 : 2019-06-30DOI: 10.25073/JAEC.201932.242
Lukás Révay, I. Zelinka
To simulate some behavior of swarms, the malware was selected as a carrier of intelligence. This article describes the current solution which is fully virtual. This gives us a possibility to interfere environment and see how the improved malware will react. This common intention provides improvements related to docker images and also architectural that is related to code changes. Communication over network together with cooperation on particle level is a key part of this solution. Malware movements are the same as movements of swarm particles, which fully fit this requirement. Significance is also put on the swarming part, where the decision which swarms algorithm to utilize is crucial. The outcome from this work should be partly practical and theoretical related to environment setup, particles communication, movements and coordination which finally finishes in distributed denial of service (DDoS) coordinated attack via hypertext transfer protocol (HTTP) to some server. After this theoretical work, the practical simulation will be done to see if the swarm attack brings expected results. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"Swarm Inteligence in Virtual Environment","authors":"Lukás Révay, I. Zelinka","doi":"10.25073/JAEC.201932.242","DOIUrl":"https://doi.org/10.25073/JAEC.201932.242","url":null,"abstract":"To simulate some behavior of swarms, the malware was selected as a carrier of intelligence. This article describes the current solution which is fully virtual. This gives us a possibility to interfere environment and see how the improved malware will react. This common intention provides improvements related to docker images and also architectural that is related to code changes. Communication over network together with cooperation on particle level is a key part of this solution. Malware movements are the same as movements of swarm particles, which fully fit this requirement. Significance is also put on the swarming part, where the decision which swarms algorithm to utilize is crucial. The outcome from this work should be partly practical and theoretical related to environment setup, particles communication, movements and coordination which finally finishes in distributed denial of service (DDoS) coordinated attack via hypertext transfer protocol (HTTP) to some server. After this theoretical work, the practical simulation will be done to see if the swarm attack brings expected results. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133058572","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 : 2019-06-30DOI: 10.25073/JAEC.201932.222
Doan Quoc Anh Nguyen, P. X. Le, Hsiao-Yi Lee
The luminous flux of two different dual-remote phosphor structures concluding flat dual-remote phosphor (FDRP) and concave dual-remote phosphor (CDRP) is compared in this paper. The outcomes demonstrate that the FDRP structure is more lucrative than the CDRP structure. The article additionally clears up that in CDRP structure, the distance between two phosphor layers (d1) and the distance between the phosphor layer with the LED surface (d2) enormously affect the optical properties. Moreover, the difference in d1 and d2 causes a dramatic variance in the scattering and absorption properties of the remote phosphor layer and hence hugely affects WLEDs' illumination ability and chromatic uniformity. In order to limit these problems, the correlated color temperature of WLEDs, which is essentially a gauge of how the chromaticity observed when a "black body" radiator is warmed to a foreordained temperature, should be balanced out at 8500K when d1 and d2 vary, requiring a suitable modification of the YAG:Ce3+ phosphor's concentration. When d1 = d2 = 0, the scattering and assimilation in the remote phosphor layer become lowermost, prompting the most reduced viability in both shading quality and iridescent transition, which is confirmed dependent on the unearthly impacts created when these two separations are not same. Then again, when d1 and d2 get bigger, so does the dispersing surface, and the mixing of the blue beams with yellow beams swings to be increasingly homogeneous. This gives the insignificant different white light yet can't achieve any enhancement for luminous flux. According to the researched results, the luminous flux reaches a peak at 1020 lm when d1 = 0.08 mm or d2 = 0.63 mm whereas the chromatic inhomogeneity hits the lowest point when d1 = 0.64 mm or d2 = 1.35 mm.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"Enhanced Luminous Flux of White Led using Flat Dual-layer Remote Phosphor Configuration","authors":"Doan Quoc Anh Nguyen, P. X. Le, Hsiao-Yi Lee","doi":"10.25073/JAEC.201932.222","DOIUrl":"https://doi.org/10.25073/JAEC.201932.222","url":null,"abstract":"The luminous flux of two different dual-remote phosphor structures concluding flat dual-remote phosphor (FDRP) and concave dual-remote phosphor (CDRP) is compared in this paper. The outcomes demonstrate that the FDRP structure is more lucrative than the CDRP structure. The article additionally clears up that in CDRP structure, the distance between two phosphor layers (d1) and the distance between the phosphor layer with the LED surface (d2) enormously affect the optical properties. Moreover, the difference in d1 and d2 causes a dramatic variance in the scattering and absorption properties of the remote phosphor layer and hence hugely affects WLEDs' illumination ability and chromatic uniformity. In order to limit these problems, the correlated color temperature of WLEDs, which is essentially a gauge of how the chromaticity observed when a \"black body\" radiator is warmed to a foreordained temperature, should be balanced out at 8500K when d1 and d2 vary, requiring a suitable modification of the YAG:Ce3+ phosphor's concentration. When d1 = d2 = 0, the scattering and assimilation in the remote phosphor layer become lowermost, prompting the most reduced viability in both shading quality and iridescent transition, which is confirmed dependent on the unearthly impacts created when these two separations are not same. Then again, when d1 and d2 get bigger, so does the dispersing surface, and the mixing of the blue beams with yellow beams swings to be increasingly homogeneous. This gives the insignificant different white light yet can't achieve any enhancement for luminous flux. According to the researched results, the luminous flux reaches a peak at 1020 lm when d1 = 0.08 mm or d2 = 0.63 mm whereas the chromatic inhomogeneity hits the lowest point when d1 = 0.64 mm or d2 = 1.35 mm.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129468292","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 : 2019-06-30DOI: 10.25073/JAEC.201932.233
P. T. Dang, K. Q. Le, Q. M. Ngo, H. Nguyen, T. Nguyen
A practical guided-mode resonance filter operating in the visible band of the electromagnetic spectrum is numerically designed in this paper. The filter provides high background transmission (>90%) with almost perfect reflection at resonance wavelengths of 623 nm and 641 nm for TE and TM modes, respectively. Our filter is also characterized by its sensitivity to incident angles, polarizations, and a refractive index of the surrounding environment which are utilized in practical applications such as tunable optical filters, imaging or detection. We show that the resonant transmission spectral response can be used for highly sensitive, a potential label-free refractive index biosensor having sensitivities of 90 nm/RIU and 103 nm/RIU, and figure of merits of 1.93 and 2.13 for TM and TE polarizations, respectively.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
{"title":"Guided-mode Resonance Filter with Ultra-narrow Bandwidth over the Visible Frequencies for Label-free Optical Biosensor","authors":"P. T. Dang, K. Q. Le, Q. M. Ngo, H. Nguyen, T. Nguyen","doi":"10.25073/JAEC.201932.233","DOIUrl":"https://doi.org/10.25073/JAEC.201932.233","url":null,"abstract":"A practical guided-mode resonance filter operating in the visible band of the electromagnetic spectrum is numerically designed in this paper. The filter provides high background transmission (>90%) with almost perfect reflection at resonance wavelengths of 623 nm and 641 nm for TE and TM modes, respectively. Our filter is also characterized by its sensitivity to incident angles, polarizations, and a refractive index of the surrounding environment which are utilized in practical applications such as tunable optical filters, imaging or detection. We show that the resonant transmission spectral response can be used for highly sensitive, a potential label-free refractive index biosensor having sensitivities of 90 nm/RIU and 103 nm/RIU, and figure of merits of 1.93 and 2.13 for TM and TE polarizations, respectively.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.","PeriodicalId":250655,"journal":{"name":"J. Adv. Eng. Comput.","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115952179","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：