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Design and Fabrication of Spoof Surface Plasmon Transmission Line Operating at High Frequency
Huu Lam Phan,Thi Quynh Hoa Nguyen,Zabdiel Brito-Brito,Fermín Mira,Ignacio Llamas-Garro,Jung-Mu Kim 대한전자공학회 2024 Journal of semiconductor technology and science Vol.24 No.2
We report a high frequency transmission line (TL) based on spoof surface plasmon transmission. The proposed TL is designed with different shapes of bar, inverted trapezoid and trapezoid which arrange periodicity along the TL to achieve the higher field confinement and/or higher cut-off frequency. Compared with the bar-shaped TL, the TL using inverted trapezoid shape can enhance the field confinement, while the TL using trapezoid shape can be used to achieve higher cut-off frequencies up to 40 GHz. The simulation and measurement results indicate that the proposed TLs can operate with high efficiency from low frequencies up to above 28 GHz. Owing to outstanding merits such as low-cost, compact design, ease of fabrication, and good operating characteristics, the proposed TL using SSP transmission is sought to be adequate for millimeter- wave devices.
PHAN Anh,LU Chi Huu,HOANG Lam Xuan,NGUYEN Phuong Minh 한국유통과학회 2022 유통과학연구 Vol.20 No.6
Purpose: This study aims to investigate the impact of investing into technology development on banking performance in an emerging country. Research design, data and methodology: Based on the data of 12 commercial banks listed in Vietnam from 2011 to 2019 and performing multivariable regression analyses as well as conducting a variety of robustness tests, we carry out the empirical investigation to discover this impact. Results: Our empirical evidence shows that these spending help to improve significantly performance of banks. Particularly, the technology expenditures have positive effect on the net interest margin and the non-interest income in which the level of influence on the latter is relatively remarkable in comparison with the former. At the same time, the result does not support the view that increasingly spending on technology may lead banks to face the risk of instability. Conclusions: Overall, our empirical analysis indicates that increasing investment into distribution information and communication technologies will help to enhance business strategies of banks and thus we advocate the bright side of technology development and digitalization in banking sector. We believe that the research is useful for both managers, regulators and policy makers in Vietnam as well as in countries having similar financial structure.
Synchrony of Spontaneous Burst Firing between Retinal Ganglion Cells Across Species
안정열,Huu Lam Phan,차성광,구교인,유용석,구용숙 한국뇌신경과학회 2020 Experimental Neurobiology Vol.29 No.4
Neurons communicate with other neurons in response to environmental changes. Their goal is to transmit information to their targets reliably. A burst, which consists of multiple spikes within a short time interval, plays an essential role in enhancing the reliability of information transmission through synapses. In the visual system, retinal ganglion cells (RGCs), the output neurons of the retina, show bursting activity and transmit retinal information to the lateral geniculate neuron of the thalamus. In this study, to extend our interest to the population level, the burstings of multiple RGCs were simultaneously recorded using a multi-channel recording system. As the first step in network analysis, we focused on investigating the pairwise burst correlation between two RGCs. Furthermore, to assess if the population bursting is preserved across species, we compared the synchronized bursting of RGCs between marmoset monkey (callithrix jacchus), one species of the new world monkeys and mouse (C57BL/6J strain). First, monkey RGCs showed a larger number of spikes within a burst, while the inter-spike interval, burst duration, and inter-burst interval were smaller compared with mouse RGCs. Monkey RGCs showed a strong burst synchronization between RGCs, whereas mouse RGCs showed no correlated burst firing. Monkey RGC pairs showed significantly higher burst synchrony and mutual information than mouse RGC pairs did. Comprehensively, through this study, we emphasize that two species have a different bursting activity of RGCs and different burst synchronization suggesting two species have distinctive retinal processing.