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Phu Tran Tin,Nhan K. H. Nguyen,Minh Q. H. Tran,Hsiao-Yi Lee 한국광학회 2017 Current Optics and Photonics Vol.1 No.4
This paper investigates a method to improve the lighting performance of white light-emitting diodes(WLEDs), which are packaged using two separate remote phosphor layers, a yellow-emitting YAG:Cephosphor layer and a red-emitting α-SrO·3B2O3:Sm2+ phosphor layer. The thicknesses of these two layersare 800 μm and 200 μm, respectively. Both of them are examined in conditions where the averagecorrelated color temperatures (CCT) are 7700 K and 8500 K. For this two-layer model, the concentrationof red phosphor is varied from 2% to 30% in the upper layer, while in the lower layer the yellow phosphorconcentration is kept at 15%. It was found interestingly that the lighting properties such as color renderingindex (CRI) and luminous flux are enhanced significantly, while the color uniformity is maintained ina relatively close range to the one of one-layer configuration (measured at the same correlated colortemperature). Besides, the transmitted and reflected light of each phosphor layer are revised by combiningKubelka-Munk and Mie-Lorenz theories. Through analysis, it is demonstrated that the packagingconfiguration of two-layer remote phosphor that employs red-emitting α-SrO·3B2O3:Sm2+ phosphor particlesprovides a practical solution for general WLEDs lighting.
Phu Tran Tin,Ph?m Minh Nam,Tran Trung Duy,Miroslav Voznak 대한전자공학회 2017 IEIE Transactions on Smart Processing & Computing Vol.6 No.3
In this paper, we investigate the tradeoff between security and reliability for a multi-hop protocol in cluster-based underlay cognitive radio networks. In the proposed protocol, a secondary source communicates with a secondary destination via the multi-hop relay method in the presence of a secondary eavesdropper. To enhance system performance under the joint impact of interference constraint required by multiple primary users and hardware impairments, the best relay node is selected at each hop to relay the source data to the destination. Moreover, the destination is equipped with multiple antennas and employs a selection combining (SC) technique to combine the received data. We derive closed-form expressions of the intercept probability (IP) for the eavesdropping links and the outage probability (OP) for the data links over a Rayleigh fading channel. Finally, the correction of our derivations is verified by Monte-Carlo simulations.
Minh Sang VO,Ngoc Phu TRAN,Thi Kieu Thu NGUYEN,Thi Cam Tien HUYNH,Thi Kim Loi NGUYEN,Le Phuong Nghi THACH,Gia Nhu THAI,Thi Thanh Sang TRAN 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.4
This study intends to analyze the impact of the country of origin on the intention to ingest COVID-19 vaccinations by measuring Vietnamese people’s perceptions of India in the manufacture of COVID-19 vaccines. The research is done using a quantitative method, and primary data was obtained using a conventional manner based on the willingness of the research respondents, who are Vietnamese persons aged 18 and up, to contribute information. The findings revealed that perceived brand association and perceived brand quality directly positively impact the COVID-19 vaccine’s consumption intention and willingness. Meanwhile, while the perceived country image component has no direct effect on consumption intention, it does have a positive indirect effect on consumption intention through perceived brand linkage and perceived brand quality. The findings also emphasize the importance and significance of a country’s image in brand association and quality perception. The study’s findings imply that to increase consumers’ willingness to buy India’s COVID-19 vaccination, the country should develop communication initiatives to improve consumer perceptions of the country’s image, the perceived value of the brand association, and brand quality.