Journal articles: 'Media-based modulation'

1

Yigit, Zehra, and Ertugrul Basar. "Space-Time Media-Based Modulation." IEEE Transactions on Signal Processing 67, no. 9 (May 1, 2019): 2389–98. http://dx.doi.org/10.1109/tsp.2019.2905836.

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Shamasundar, Bharath, K. Manu Krishnan, T. Lakshmi Narasimhan, and A. Chockalingam. "MAP-Index Coded Media-Based Modulation." IEEE Communications Letters 22, no. 12 (December 2018): 2455–58. http://dx.doi.org/10.1109/lcomm.2018.2874263.

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Yildirim, I., E. Basar, and G. K. Kurt. "Media‐based modulation for secrecy communications." Electronics Letters 54, no. 12 (June 2018): 789–91. http://dx.doi.org/10.1049/el.2018.0764.

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Chen, Xuan, Miaowen Wen, Qiang Li, Yik-Chung Wu, and Theodoros A. Tsiftsis. "Dual-Polarized Spatial Media-Based Modulation." IEEE Journal of Selected Topics in Signal Processing 13, no. 6 (October 2019): 1258–69. http://dx.doi.org/10.1109/jstsp.2019.2942220.

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Can, Mehmet, İbrahim Altunbaş, and Ertugrul Basar. "NOMA-based downlink relaying with media-based modulation." Physical Communication 41 (August 2020): 101116. http://dx.doi.org/10.1016/j.phycom.2020.101116.

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Naresh, Yalagala, and Ananthanarayanan Chockalingam. "On Media-Based Modulation Using RF Mirrors." IEEE Transactions on Vehicular Technology 66, no. 6 (June 2017): 4967–83. http://dx.doi.org/10.1109/tvt.2016.2620989.

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Oladoyinbo, Segun, Narushan Pillay, and Hongjun Xu. "Media-based single-symbol generalized spatial modulation." International Journal of Communication Systems 32, no. 6 (February 10, 2019): e3909. http://dx.doi.org/10.1002/dac.3909.

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Yildirim, Ibrahim, Ertugrul Basar, and Ibrahim Altunbas. "Coordinate Interleaved Orthogonal Design With Media-Based Modulation." IEEE Transactions on Vehicular Technology 70, no. 3 (March 2021): 2867–71. http://dx.doi.org/10.1109/tvt.2021.3059325.

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9

Peng, Runsheng, and Fanggang Wang. "Secure Joint Transmitter-Receiver Spatial Media-Based Modulation." IEEE Access 8 (2020): 129310–19. http://dx.doi.org/10.1109/access.2020.3009346.

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Mao, Tianqi, Qi Wang, Miaowen Wen, and Zhaocheng Wang. "Secure Single-Input-Multiple-Output Media-Based Modulation." IEEE Transactions on Vehicular Technology 69, no. 4 (April 2020): 4105–17. http://dx.doi.org/10.1109/tvt.2020.2975303.

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Pillay, Narushan, and HongJun Xu. "Quadrature spatial media-based modulation with RF mirrors." IET Communications 11, no. 16 (November 9, 2017): 2440–48. http://dx.doi.org/10.1049/iet-com.2017.0269.

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Kavunkal, Manu Krishnan, Swaroop Jacob, and A. Chockalingam. "Message Passing Receivers for Generalized Media-Based Modulation Signals." IEEE Transactions on Wireless Communications 18, no. 5 (May 2019): 2607–22. http://dx.doi.org/10.1109/twc.2019.2906174.

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Basar, Ertugrul. "Media-Based Modulation for Future Wireless Systems: A Tutorial." IEEE Wireless Communications 26, no. 5 (October 2019): 160–66. http://dx.doi.org/10.1109/mwc.2019.1800568.

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14

Zhang, Limin, and Minjian Zhao. "Secrecy Enhancement for Media-Based Modulation via Probabilistic Optimization." IEEE Communications Letters 23, no. 7 (July 2019): 1149–52. http://dx.doi.org/10.1109/lcomm.2018.2890242.

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15

Minuhin, Vadim B. "Model of media noise generation based on modulation theory." Journal of Applied Physics 85, no. 8 (April 15, 1999): 4988–90. http://dx.doi.org/10.1063/1.370067.

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Lei, Xuelin, Xiaoshan Ma, Zhen Yang, Xiaodong Peng, Yun Li, and Wei Ni. "Compressive Sensing Imaging Based on Modulation of Atmospheric Scattering Medium." Applied Sciences 10, no. 13 (June 28, 2020): 4466. http://dx.doi.org/10.3390/app10134466.

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Long-distance imaging in time-varying scattering media, such as atmosphere, is a significant challenge. Light is often heavily diffused while propagating through scattering media, because of which the clear imaging of objects concealed by media becomes difficult. In this study, instead of suppressing diffusion by multiple scattering, we used natural randomness of wave propagation through atmospheric scattering media as an optimal and instantaneous compressive imaging mechanism. A mathematical model of compressive imaging based on the modulation of atmospheric scattering media was established. By using the Monte Carlo method, the atmospheric modulation matrix was obtained, and the numerical simulation of modulation imaging of atmospheric scattering media was performed. Comparative experiments show that the atmospheric matrix can achieve the same modulation effect as the Hadamard and Gaussian random matrices. The effectiveness of the proposed optical imaging approach was demonstrated experimentally by loading the atmospheric measurement matrix onto a digital micromirror device to perform single pixel compressive sensing measurements. Our work provides a new direction to ongoing research in the field of imaging through scattering media.

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SUEKANE, Michinobu, and Masao MIYAMURA. "Overwrite Modulation in Co-Based Thin Film Longitudinal Recording Media." Journal of the Magnetics Society of Japan 18, S_1_PMRC_94_1 (1994): S1_467–470. http://dx.doi.org/10.3379/jmsjmag.18.s1_467.

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Shamasundar, Bharath, Swaroop Jacob, Lakshmi Narasimhan Theagarajan, and Ananthanarayanan Chockalingam. "Media-Based Modulation for the Uplink in Massive MIMO Systems." IEEE Transactions on Vehicular Technology 67, no. 9 (September 2018): 8169–83. http://dx.doi.org/10.1109/tvt.2018.2839706.

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19

Yarkin, Ferhat, Ibrahim Altunbas, and Ertugrul Basar. "Cooperative Space Shift Keying Media-Based Modulation With Hybrid Relaying." IEEE Systems Journal 14, no. 1 (March 2020): 500–509. http://dx.doi.org/10.1109/jsyst.2019.2899876.

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20

Jeong, Seongkwon, and Jaejin Lee. "Modulation Decoding Based on K-Means Algorithm for Bit-Patterned Media Recording." Applied Sciences 12, no. 17 (August 30, 2022): 8703. http://dx.doi.org/10.3390/app12178703.

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In bit-patterned media recording (BPMR) systems, the readback signal is affected by neighboring islands that are characterized by intersymbol interference (ISI) and intertrack interference (ITI). Since increasing the areal density encourages the influence of ISI and ITI, it is more difficult to detect the data. Modulation coding can prevent the occurrence of specific data patterns that can cause severe ISI and ITI. In this study, we propose a modulation decoding method based on the K-means algorithm for a BPMR system to improve decoding capabilities. As the K-means algorithm helps understand data patterns and characteristics, the K-means decoder shows the best performance.

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Kabacı, Akif, Mehmet Başaran, and Hakan Ali Çırpan. "Reference signal-aided channel estimation in spatial media-based modulation systems." Physical Communication 47 (August 2021): 101396. http://dx.doi.org/10.1016/j.phycom.2021.101396.

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Kobayashi, Masaki, Takashi Mizumoto, Yukihiro Shibuya, Masaru Enomoto, and Motohiro Takeda. "Fluorescence tomography in turbid media based on acousto-optic modulation imaging." Applied Physics Letters 89, no. 18 (October 30, 2006): 181102. http://dx.doi.org/10.1063/1.2364600.

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23

Naresh, Y., and A. Chockalingam. "A Low-Complexity Maximum-Likelihood Detector for Differential Media-Based Modulation." IEEE Communications Letters 21, no. 10 (October 2017): 2158–61. http://dx.doi.org/10.1109/lcomm.2017.2687921.

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Naresh, Yalagala, and Ananthanarayanan Chockalingam. "Performance Analysis of Media-Based Modulation With Imperfect Channel State Information." IEEE Transactions on Vehicular Technology 67, no. 5 (May 2018): 4192–207. http://dx.doi.org/10.1109/tvt.2018.2791845.

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25

Adejumobi, Babatunde S., and Thokozani Shongwe. "Labeling Diversity for Media-Based Space-Time Block Coded Spatial Modulation." IEEE Access 8 (2020): 99870–79. http://dx.doi.org/10.1109/access.2020.2995945.

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26

Shamasundar, Bharath, and A. Chockalingam. "Constellation Design for Media-Based Modulation Using Block Codes and Squaring Construction." IEEE Journal on Selected Areas in Communications 38, no. 9 (September 2020): 2156–67. http://dx.doi.org/10.1109/jsac.2020.3000828.

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27

Pillay, Narushan, and Hongjun Xu. "Uncoded Space-Time Labeling Diversity—Application of Media-Based Modulation With RF Mirrors." IEEE Communications Letters 22, no. 2 (February 2018): 272–75. http://dx.doi.org/10.1109/lcomm.2017.2770145.

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Harada, Kohsuke, Nobuhiro Maeto, Akihiro Yamazaki, and Akihiko Takeo. "Robust Modulation of PWM-Based Multi-Level Perpendicular Magnetic Recording for Conventional Media." IEEE Communications Letters 22, no. 4 (April 2018): 724–27. http://dx.doi.org/10.1109/lcomm.2018.2806960.

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Naresh, Yalagala, and Ananthanarayanan Chockalingam. "Performance Analysis of Full-Duplex Decode-and-Forward Relaying With Media-Based Modulation." IEEE Transactions on Vehicular Technology 68, no. 2 (February 2019): 1510–24. http://dx.doi.org/10.1109/tvt.2018.2887062.

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30

Gorbunkov, Mikhail V., Yulia Y. Maslova, Yurii V. Shabalin, and Vladimir G. Tunkin. "Variable Repetition Rate Picosecond Master Oscillator for Photoelectron Gun." Photonics 9, no. 2 (February 13, 2022): 106. http://dx.doi.org/10.3390/photonics9020106.

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In this work, aiming at the master oscillator of the photoelectron gun with a variable repetition rate of electron bunches, a picosecond solid-state laser subject to delayed optoelectronic feedback and RF loss modulation is studied. Loss modulation is performed using an electro-optical modulator with zero bias at the second accelerator frequency subharmonic. Optoelectronic negative feedback uses an intracavity electro-optical modulator and a fast high-voltage photodiode mounted as close as possible to the modulator crystal. An analytical formula is obtained for the pulse duration, and estimates are given for Nd and Yb based media and L, S, C and X-band used in modern linear accelerators. Numerical simulation proves that the control is suitable for pulse-repetitive operation. The proposed approach solves the problem of laser pulse shortening and locking the master oscillator, and therefore, electron bunches in photoelectron guns, to the high-stable RF generator controlling accelerator functioning.

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31

Cheng, Baozhu, Hong Hou, and Nansha Gao. "An acoustic metasurface with simultaneous phase modulation and energy attenuation." Modern Physics Letters B 32, no. 23 (August 17, 2018): 1850276. http://dx.doi.org/10.1142/s0217984918502767.

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We introduced a rigid structure into the acoustic metasurface design, the proposed labyrinth structure is based on the equivalent medium theory and different media are replaced by curly labyrinth. Layered media theory and equivalent medium theory are combined to design the arbitrary acoustic metasurface structure. An acoustic metasurface studied in this paper realized simultaneous phase modulation and energy attenuation in the air, the effective phase modulation range covered from 30[Formula: see text] to 90[Formula: see text] and the energy attenuation is over 40%. According to layered media theory which could modulate the acoustic wave direction, the metasurface with same function can also be applied to underwater case. Corresponding simulation results are calculated by FEA. Finally, by introducing the curly labyrinth theory, the underwater acoustic metasurface with simultaneous phase modulation and energy attenuation is designed and verified. This paper has potential applications in rigid underwater acoustic metasurface designs with low frequency, adjustable direction and sound energy attenuation.

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32

Kniazkov, A. V., and S. N. Davydov. "An electric field sensor based on reflected light intensity modulation from electro-optical media." Optical Memory and Neural Networks 26, no. 2 (April 2017): 145–49. http://dx.doi.org/10.3103/s1060992x17020096.

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Yang, Jiamiao, Yuecheng Shen, Yan Liu, Ashton S. Hemphill, and Lihong V. Wang. "Focusing light through scattering media by polarization modulation based generalized digital optical phase conjugation." Applied Physics Letters 111, no. 20 (November 13, 2017): 201108. http://dx.doi.org/10.1063/1.5005831.

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34

Ma, Xiangxue, Shuaishuai Guo, and Dongfeng Yuan. "Improved Compressed Sensing-Based Joint User and Symbol Detection for Media-Based Modulation-Enabled Massive Machine- Type Communications." IEEE Access 8 (2020): 70058–70. http://dx.doi.org/10.1109/access.2020.2987055.

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35

Zhao Ming, 赵明, 赵美晶 Zhao Meijing, 孙程伟 Sun Chengwei, and 许文海 Xu Wenhai. "Measurement and Light Focusing by Transmission Matrices of Scattering Media Based on Phase-Only Modulation." Acta Optica Sinica 38, no. 1 (2018): 0129001. http://dx.doi.org/10.3788/aos201838.0129001.

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36

Adejumobi, Babatunde S., and Narushan Pillay. "RF mirror media-based space-time block coded spatial modulation techniques for two time-slots." IET Communications 13, no. 15 (September 17, 2019): 2313–21. http://dx.doi.org/10.1049/iet-com.2018.5161.

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37

Qiao, Li, Jun Zhang, Zhen Gao, Sheng Chen, and Lajos Hanzo. "Compressive Sensing Based Massive Access for IoT Relying on Media Modulation Aided Machine Type Communications." IEEE Transactions on Vehicular Technology 69, no. 9 (September 2020): 10391–96. http://dx.doi.org/10.1109/tvt.2020.3006318.

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38

Lalas, Antonios X., Nikolaos V. Kantartzis, and Theodoros D. Tsiboukis. "Piezoelectrically programmable electric-field driven LC (ELC) resonators acting as THz modulators." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 35, no. 4 (July 4, 2016): 1460–67. http://dx.doi.org/10.1108/compel-12-2015-0480.

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Purpose – Metamaterials are artificially tailored complex media with extraordinary properties, not available in nature. Due to their unique performance, they are considered as a crucial component of modern radio-frequency technology, especially in the THz regime. However, their lack of wide spectral bandwidths introduce constraints for realistic applications. The purpose of this paper is to propose piezoelectric micro-electromechanical systems (MEMS) actuators to modify the shape of electric field-driven LC (ELC) resonators. A THz modulation capability is revealed by connecting/disconnecting the associated metal parts. Design/methodology/approach – Piezoelectric MEMS actuators are proposed to provide the desired bandwidth enhancement along with THz modulation. Two setups with different degrees of freedom in altering the behaviour of the novel modulator are investigated. A variety of numerical data, acquired via the finite element method, substantiate the advantageous characteristics of the proposed structures. Findings – The novel devices enable the modification of the structural features of an ELC-based complex medium, unveiling in this manner a significant THz modulation capability along with improved bandwidth tunability. Two discrete cases are presented involving different degrees of freedom to shape the overall performance of the metamaterial modulator. Originality/value – Development of a THz modulator, which utilises metamaterials as its fundamental component. Incorporation of tunable piezoelectric metamaterials into THz technology allowing increased reconfigurability. Bandwidth enhancement of metamaterial systems and alternative design via multiple controllable gaps enabling more degrees of freedom for design purposes.

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Li, Yongzhi, Cheng Tao, Yapeng Li, Liu Liu, and Tao Zhou. "Investigation of Sphere Decoder and Channel Tracking Algorithms for Media-Based Modulation over Time-Selective Channels." Wireless Communications and Mobile Computing 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/2509824.

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The performance of media-based modulation (MBM) systems, where additional information can be conveyed by the indices of the channel states created by RF mirrors, over time-selective channels is investigated. By transforming the MBM system model into a traditional MIMO system model, we first propose a reduced complexity sphere decoder algorithm. Then two channel tracking algorithms, which are based on least mean square adaptive filter and recursive least-squares adaptive filter, are employed in order to combat the performance loss caused by the time-varying channels. Numerical results show that the proposed sphere decoder and these two channel tracking algorithms perform well in MBM systems.

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40

Wu, Jun, Yaqiong Du, Jun Xia, Tong Zhang, Wei Lei, and Baoping Wang. "Dynamically Tunable Light Absorbers as Color Filters Based on Electrowetting Technology." Nanomaterials 9, no. 1 (January 6, 2019): 70. http://dx.doi.org/10.3390/nano9010070.

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A device that uses the electrowetting fluid manipulation technology to realize the reversible and dynamical modulation of the local surface plasmon resonance is invented. By varying the electrowetting voltage, the distribution of fluids media surrounding the grating structure get changed accordingly, causing the modulation of the plasmonic resonance peak. The simulation results indicated that three primary colors, that are cyan, magenta and yellow (CMY) can be respectively reflected through selecting suitable structural parameters. More importantly, for the first time, the invented fluid-based devices have exhibited fine-tuning characteristics for each primary color. Finally, the device has been proved to have a large color gamut range in the Commission International De L’E’clairage (CIE) 1931 color space.

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Jia, You-Quan, Qi Feng, Bin Zhang, Wei Wang, Cheng-You Lin, and Ying-Chun Ding. "Superpixel-Based Complex Field Modulation Using a Digital Micromirror Device for Focusing Light through Scattering Media." Chinese Physics Letters 35, no. 5 (May 2018): 054203. http://dx.doi.org/10.1088/0256-307x/35/5/054203.

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42

Loizou, C. P., V. Murray, M. S. Pattichis, M. Pantziaris, A. N. Nicolaides, and C. S. Pattichis. "Despeckle Filtering for Multiscale Amplitude-Modulation Frequency-Modulation (AM-FM) Texture Analysis of Ultrasound Images of the Intima-Media Complex." International Journal of Biomedical Imaging 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/518414.

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The intima-media thickness (IMT) of the common carotid artery (CCA) is widely used as an early indicator of cardiovascular disease (CVD). Typically, the IMT grows with age and this is used as a sign of increased risk of CVD. Beyond thickness, there is also clinical interest in identifying how the composition and texture of the intima-media complex (IMC) changed and how these textural changes grow into atherosclerotic plaques that can cause stroke. Clearly though texture analysis of ultrasound images can be greatly affected by speckle noise, our goal here is to develop effective despeckle noise methods that can recover image texture associated with increased rates of atherosclerosis disease. In this study, we perform a comparative evaluation of several despeckle filtering methods, on 100 ultrasound images of the CCA, based on the extracted multiscale Amplitude-Modulation Frequency-Modulation (AM-FM) texture features and visual image quality assessment by two clinical experts. Texture features were extracted from the automatically segmented IMC for three different age groups. The despeckle filters hybrid median and the homogeneous mask area filter showed the best performance by improving the class separation between the three age groups and also yielded significantly improved image quality.

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43

Ullah, Imran, Ran Lee, Keon Bong Oh, Seongsoo Hwang, Youngim Kim, Tai-Young Hur, and Sun A. Ock. "Transdifferentiation of α-1,3-galactosyltransferase knockout pig bone marrow derived mesenchymal stem cells into pancreatic β-like cells by microenvironment modulation." Asian-Australasian Journal of Animal Sciences 33, no. 11 (November 1, 2020): 1837–47. http://dx.doi.org/10.5713/ajas.19.0796.

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Objective: To evaluate the pancreatic differentiation potential of α-1,3-galactosyltransferase knockout (GalTKO) pig-derived bone marrow-derived mesenchymal stem cells (BM-MSCs) using epigenetic modifiers with different pancreatic induction media.Methods: The BM-MSCs have been differentiated into pancreatic β-like cells by inducing the overexpression of key transcription regulatory factors or by exposure to specific soluble inducers/small molecules. In this study, we evaluated the pancreatic differentiation of GalTKO pig-derived BM-MSCs using epigenetic modifiers, 5-azacytidine (5-Aza) and valproic acid (VPA), and two types of pancreatic induction media – advanced Dulbecco's modified Eagle's medium (ADMEM)-based and N2B27-based media. GalTKO BM-MSCs were treated with pancreatic induction media and the expression of pancreas-islets-specific markers was evaluated by real-time quantitative polymerase chain reaction, Western blotting, and immunofluorescence. Morphological changes and changes in the 5'-C-phosphate-G-3' (CpG) island methylation patterns were also evaluated.Results: The expression of the pluripotent marker (POU class 5 homeobox 1 [OCT4]) was upregulated upon exposure to 5-Aza and/or VPA. GalTKO BM-MSCs showed increased expression of neurogenic differentiation 1 in the ADMEM-based (5-Aza) media, while the expression of NK6 homeobox 1 was elevated in cells induced with the N2B27-based (5-Aza) media. Moreover, the morphological transition and formation of islets-like cellular clusters were also prominent in the cells induced with the N2B27-based media with 5-Aza. The higher insulin expression revealed the augmented trans-differentiation ability of GalTKO BM-MSCs into pancreatic β-like cells in the N2B27-based media than in the ADMEM-based media.Conclusion: 5-Aza treated GalTKO BM-MSCs showed an enhanced demethylation pattern in the second CpG island of the OCT4 promoter region compared to that in the GalTKO BM-MSCs. The exposure of GalTKO pig-derived BM-MSCs to the N2B27-based microenvironment can significantly enhance their trans-differentiation ability into pancreatic β-like cells.

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Perregaux, David G., and Christopher A. Gabel. "Human monocyte stimulus-coupled IL-1β posttranslational processing: modulation via monovalent cations." American Journal of Physiology-Cell Physiology 275, no. 6 (December 1, 1998): C1538—C1547. http://dx.doi.org/10.1152/ajpcell.1998.275.6.c1538.

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Lipopolysaccharide-activated human monocytes produce prointerleukin (pro-IL)-1β but release little of this inflammatory cytokine as the biologically active species. Efficient externalization of mature 17-kDa cytokine requires that the activated monocytes encounter a secondary stimulus such as ATP. To identify cation requirements of the ATP-induced process, lipopolysaccharide-activated monocytes were treated with ATP in media containing different Cl−salts or sucrose. Media devoid of Na+did not support IL-1β processing. Titration of NaCl into choline chloride- or sucrose-based media restored 17-kDa IL-1β production. Na+replacement, however, was not sufficient to support ATP-induced production of 17-kDa IL-1β in the presence of ≥37 mM extracellular K+or Li+. Inhibition by K+suggests that efflux of this cation is a necessary component of the stimulus-coupled response. The inhibitory effect achieved by Na+depletion is not due to inactivation of the ATP receptor and is distinct from a caspase-1 inhibitor. Stimulus-coupled IL-1β posttranslational processing, therefore, requires extracellular Na+for a step downstream of the initiating stimulus but preceding caspase-1 activation.

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Deng, Huaxia, Guan Wang, Qiang Li, Qianzhen Sun, Mengchao Ma, and Xiang Zhong. "Transmissive Single-Pixel Microscopic Imaging through Scattering Media." Sensors 21, no. 8 (April 13, 2021): 2721. http://dx.doi.org/10.3390/s21082721.

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Microscopic imaging is of great significance for medical diagnosis. However, due to the strong scattering and absorption of tissue, the implementation of non-invasive microscopic imaging is very difficult. Traditional single-pixel microscopes, based on reflective optical systems, provide an alternative solution for scattering media imaging. Here, the single-pixel microscope with transmissive liquid crystal modulation is proposed. The microscopic ability of the proposed microscope is calibrated. The multi-spectral microscopic imaging of the object is demonstrated. The transmissive imaging of the object behind the scattering media is analyzed. The proposed prototype of the transmissive single-pixel microscope is expected to be applied in microscopic imaging through scattering media and medical imaging.

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46

Bamisaye, Ayodeji James, and Tahmid Quazi. "Using of Golden Code Orthogonal Super-Symbol in Media-Based Modulation for Single-Input Multiple-Output Schemes." Journal of Telecommunications and Information Technology 2 (June 30, 2022): 43–48. http://dx.doi.org/10.26636/jtit.2022.158921.

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47

Chen, Shenna, Qian Zhao, Fang Liu, Haowen Huang, Linqian Wang, Shoujun Yi, Yunlong Zeng, and Yi Chen. "Ultrasensitive Determination of Copper in Complex Biological Media Based on Modulation of Plasmonic Properties of Gold Nanorods." Analytical Chemistry 85, no. 19 (September 11, 2013): 9142–47. http://dx.doi.org/10.1021/ac401789n.

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48

Bruno, Vincenzo, Stefano Vezzoli, Clayton DeVault, Thomas Roger, Marcello Ferrera, Alexandra Boltasseva, Vladimir M. Shalaev, and Daniele Faccio. "Dynamical Control of Broadband Coherent Absorption in ENZ Films." Micromachines 11, no. 1 (January 20, 2020): 110. http://dx.doi.org/10.3390/mi11010110.

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Interferometric effects between two counter-propagating beams incident on an optical system can lead to a coherent modulation of the absorption of the total electromagnetic radiation with 100% efficiency even in deeply subwavelength structures. Coherent perfect absorption (CPA) rises from a resonant solution of the scattering matrix and often requires engineered optical properties. For instance, thin film CPA benefits from complex nanostructures with suitable resonance, albeit at a loss of operational bandwidth. In this work, we theoretically and experimentally demonstrate a broadband CPA based on light-with-light modulation in epsilon-near-zero (ENZ) subwavelength films. We show that unpatterned ENZ films with different thicknesses exhibit broadband CPA with a near-unity maximum value located at the ENZ wavelength. By using Kerr optical nonlinearities, we dynamically tune the visibility and peak wavelength of the total energy modulation. Our results based on homogeneous thick ENZ media open a route towards on-chip devices that require efficient light absorption and dynamical tunability.

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Robson, Stephen, Gan Tan, and Abderrahmane Haddad. "Low-Cost Monitoring of Synchrophasors Using Frequency Modulation." Energies 12, no. 4 (February 15, 2019): 611. http://dx.doi.org/10.3390/en12040611.

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A new, low-cost method of simultaneously measuring and communicating voltage and current on distribution networks is presented. Based on Frequency Modulation (FM) of the measured fundamental frequency (and harmonics), followed by immediate re-injection of the modulated waveform back into the network, the proposed method can be implemented using inexpensive and readily available electronics. Furthermore, the method does not require a separate communication media, but instead uses the power line itself to propagate the FM signals back to a central point. EMTP-ATP simulations on a mixed LV/MV network are performed and experimental analysis demonstrates the practicality and robustness of the new method. The low-cost of the method would suit deployment on parts of the network which are otherwise overlooked for monitoring.

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DANTSKER, D. "PHOTOINDUCED NONLINEAR EFFECTS IN ORGANIC PHOTOCHROMICS." Journal of Nonlinear Optical Physics & Materials 05, no. 04 (October 1996): 775–88. http://dx.doi.org/10.1142/s0218863596000556.

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Abstract:

An analytic expression describing two-wavelength light propagation through an organic photoreversible photochromic Azo and Stilbene-like molecular media characterized by a strong nonoverlapping absorption by the two chromophore isomers has been derived. An analysis of the transmission coefficients for the Trans and Cis modulation modes has shown linear dependence on the pump intensity accompanied by self modulation slope dependence. In addition, the wavelength dependence of the modulation strength and the resulting inverse relationship of the pump intensity as a function of the absorption cross-section has been presented. Large constrast ratios have been obtained for rather low pump and read-out intensities of the order of a hundred microwatts per centimeter square and less. Such optimal working conditions provide a very attractive characteristic for an OASLM based on photoreversible photochromic organic molecular systems.

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Journal articles on the topic 'Media-based modulation'

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