Article
Engineering, Electrical & Electronic
Jisu Lee, Ae-Kyoung Lee, Seon-Eui Hong, Hyung-Do Choi, Kyung-Young Jung
Summary: This research proposes a numerical model for SAR study of tablets in the wireless local area network band. Based on SAR test reports of tablets distributed in South Korea, the design criteria and performance of the proposed model are evaluated.
JOURNAL OF ELECTROMAGNETIC ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Chiaki Takasaka, Kazuyuki Saito, Masaharu Takahashi, Tomoaki Nagaoka, Kanako Wake
Summary: This study focused on the specific absorption rate (SAR) caused by electromagnetic waves emitted from smartphones. It developed high-resolution numerical smartphone models to investigate the SAR variation with different positions and tilt angles in relation to the human abdomen.
IEICE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Jisu Lee, Ae-Kyoung Lee, Seon-Eui Hong, Hyung-Do Choi, Kyung-Young Jung
Summary: This paper presents representative numerical modeling of smartphones for epidemiological studies, focusing on the wideband code division multiple access (WCDMA), long-term evaluation (LTE), and wireless local area network (WLAN) bands. The numerical results show that the designed smartphone models have good matching and radiation performance, with 1-g psSAR values within +/- 16% of the target values.
JOURNAL OF ELECTROMAGNETIC ENGINEERING AND SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Jianxun Zhao, Guoxuan Zhao, Jiaxiong Dan, Xu Zhang, Shuai Li
Summary: Adaptive temperature control is proposed to increase the nonthermal exposure level of in vitro experiments. By regulating air temperature, it can double the maximum SAR to trigger and characterize nonthermal effects. This method proves effective in suppressing temperature variances in cells and increasing exposure levels.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Engineering, Electrical & Electronic
Harune Sekido, Takayuki Umeda
Summary: This paper proposes a new explicit and non-dissipative finite-difference time-domain (FDTD) method in two and three dimensions for tackling the Courant condition. By adding third-degree spatial difference terms with coefficients to the time-development equations of FDTD(2,4), optimal coefficients are obtained through a brute-force search of the dispersion relations to reduce phase velocity errors while maintaining numerical stability. The new method is stable with large Courant numbers and exhibits smaller numerical errors in phase velocity compared to conventional FDTD methods with small Courant numbers.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Biophysics
Sossena Wood, Tales Santini, Narayanan Krishnamurthy, Tiago Martins, Nadim Farhat, Tamer S. Ibrahim
Summary: Electromagnetic simulations are a valuable tool for evaluating RF coils in MRI applications. Testing with anthropomorphic phantoms can provide more accurate results compared to standard homogeneous phantoms. The study demonstrated that the anthropomorphic heterogeneous head phantom model provided more accurate results in terms of scattering parameters and electric field distribution compared to the homogeneous phantom model.
NMR IN BIOMEDICINE
(2021)
Article
Energy & Fuels
Lukasz Januszkiewicz
Summary: The study explored the shielding effectiveness of metal foil head covers against fifth generation telecommunication system base station radiation. It found that foil head covers can reduce power density in the head region by approximately 50%, but full-metal surface shield may increase energy absorbed by human tissue in some areas of the head. Therefore, a wire-based shield structure design was proposed as an alternative to the full-metal head cover to maintain user comfort while providing comparable performance in wave propagation.
Article
Chemistry, Analytical
Negin Foroughimehr, Zoltan Vilagosh, Ali Yavari, Andrew Wood
Summary: This study used a mathematical simulation to investigate the absorption of millimeter wave (mmW) and terahertz (THz) waves by the cornea under normal and pathological conditions. Factors such as tear film thickness and hydration levels were considered, which are important for corneal health. The study found that changes in tear film properties, associated with dry eye syndrome, directly impact the absorption of mmW and THz waves by the cornea.
Article
Engineering, Electrical & Electronic
Rodrigo M. S. de Oliveira, Rodrigo R. Paiva
Summary: A central least-squares spatial derivative procedure and LS-FDTD method have been developed to approximate spatial derivatives and attenuate nonphysical modes. The proposed method has been successfully validated for 1-D and 2-D problems with time steps beyond the FDTD CFL limit, demonstrating accuracy and stability conditions for LS-FDTD.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Xuejiao Zhao, Shipeng Wang, Qiong Wu, Yanju Ji
Summary: The theory of magnetic-source electromagnetic anomalous diffusion is developed, presenting a multiscale electromagnetic anomalous diffusion theory with improved generalized electrical conductivity. This theory is applied to propose a 3-D modeling method for complex electromagnetic propagation in rough geologic medium, demonstrating improved efficiency and accuracy in detection.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Mathematics, Applied
Theodoros T. Zygiridis, Stamatios A. Amanatiadis, Aristeides D. Papadopoulos, Nikolaos Kantartzis
Summary: This work presents a finite-difference time-domain (FDTD) methodology that allows for controllable accuracy within prescribed frequency bands, dealing with material dispersion described by the Lorentz model. An optimization technique based on the one-dimensional numerical dispersion relation is introduced to modify the form of the spatial operators, ensuring that the numerical wavenumber closely matches the exact one in specific frequency ranges.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Lihao Song, Eng Leong Tan, Ding Yu Heh, Bowen Bai, Xiaoping Li, Yanming Liu
Summary: This article proposes a novel finite-difference time-domain (FDTD) method for studying electromagnetic wave propagation in time-varying plasma. The method, called the Newton-ADE FDTD method, is based on Newton's equation of motion and provides more accurate results compared to traditional methods in time-varying plasma conditions.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Chemistry, Multidisciplinary
Eric Ballestero, Brian Hamilton, Noe Jimenez, Vicent Romero-Garcia, Jean-Philippe Groby, Haydar Aygun, Stephen Dance
Summary: The paper presents a framework for simplifying complex structures into surface impedance and applying it to large FDTD computing environments. By reducing the meshing load and computation time of the model, simulations of metamaterials are achieved, and the fitting of RLC parameters from complex impedance data obtained from transfer matrix models is solved.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Sihan Zhao, Bing Wei, Xinbo He, Yiwen Li, Xiaolong Wei
Summary: The hybrid FDTD algorithm proposed in this paper combines the advantages of US-FDTD and traditional FDTD methods to achieve unconditional stability and high calculation efficiency. By using different FDTD methods in different subdomains, it reduces the time and computational complexity while ensuring accuracy.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Xiao-Yao Feng, Zhizhang Chen, Zhi-Meng Xu
Summary: This article introduces a method that incorporates the concept of kurtosis into time-reversal processing, allowing for reconstruction of both spatial locations and source excitation time instants. The method clears the way for the application of time-reversal methods to real-world problems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Ophthalmology
Ninel Z. Gregori, Natalia F. Callaway, Catherine Hoeppner, Alex Yuan, Aleksandra Rachitskaya, William Feuer, Hossein Ameri, J. Fernando Arevalo, Albert J. Augustin, David G. Birch, Gislin Dagnelie, Salvatore Grisanti, Janet L. Davis, Paul Hahn, James T. Handa, Allen C. Ho, Suber S. Huang, Mark S. Humayun, Raymond Iezzi, K. Thiran Jayasundera, Gregg T. Kokame, Byron L. Lam, Jennifer I. Lim, Naresh Mandava, Sandra R. Montezuma, Lisa Olmos de Koo, Peter Szurman, Lejla Vajzovic, Peter Wiedemann, James Weiland, Jiong Yan, David N. Zacks
AMERICAN JOURNAL OF OPHTHALMOLOGY
(2018)
Article
Engineering, Biomedical
Zhen Huan Zhang, Meng Xin Pan, Jia Tong Cai, James D. Weiland, Kinon Chen
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
(2018)
Article
Engineering, Biomedical
Steven T. Walston, Robert H. Chow, James D. Weiland
JOURNAL OF NEURAL ENGINEERING
(2018)
Article
Electrochemistry
Curtis D. Lee, Eric M. Hudak, John J. Whalen, Artin Petrossians, James D. Weiland
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2018)
Article
Engineering, Biomedical
Yao-Chuan Chang, Dorsa Haji Ghaffari, Robert H. Chow, James D. Weiland
JOURNAL OF NEURAL ENGINEERING
(2019)
Article
Ophthalmology
Kiran N. Nimmagadda, James D. Weiland
TRANSLATIONAL VISION SCIENCE & TECHNOLOGY
(2018)
Review
Clinical Neurology
Lauren N. Ayton, Nick Barnes, Gislin Dagnelie, Takashi Fujikado, Georges Goetz, Ralf Hornig, Bryan W. Jones, Mahiul M. K. Muqit, Daniel L. Rathbun, Katarina Stingl, James D. Weiland, Matthew A. Petoe
CLINICAL NEUROPHYSIOLOGY
(2020)
Article
Engineering, Biomedical
Elena della Valle, Elissa J. Welle, Cynthia A. Chestek, James D. Weiland
Summary: The study conducted PtIr electrodeposition on carbon fiber microelectrode arrays to improve interface properties, resulting in a PtIr coating with 70% Pt and 30% Ir composition and reduced impedance by 89% at 1 kHz.
JOURNAL OF NEURAL ENGINEERING
(2021)
Article
Engineering, Biomedical
Yu Huan, Jeffrey P. Gill, Johanna B. Fritzinger, Paras R. Patel, Julianna M. Richie, Elena Della Valle, James D. Weiland, Cynthia A. Chestek, Hillel J. Chiel
Summary: Carbon fiber electrodes (CFEs) show potential for stable intracellular stimulation and recording with good signal-to-noise ratios, allowing for multi-neuron recording simultaneously. Despite lower amplitudes compared to glass microelectrodes, CFEs provide a powerful new technology for studying neural circuit dynamics.
JOURNAL OF NEURAL ENGINEERING
(2021)
Article
Engineering, Biomedical
Joseph G. Letner, Paras R. Patel, Jung-Chien Hsieh, Israel M. Smith Flores, Elena della Valle, Logan A. Walker, James D. Weiland, Cynthia A. Chestek, Dawen Cai
Summary: This study demonstrates the importance of high electrode biocompatibility and precise localization of neurons in characterizing the relationship between neuron spiking and recorded signals. The findings suggest that minimally invasive electrodes have the potential to sample naturalistic neural populations.
JOURNAL OF NEURAL ENGINEERING
(2023)
Article
Computer Science, Information Systems
Hojun Son, James Weiland
Summary: The deployment of a deep convolutional neural network on low compute devices is a crucial area of research. This article proposes a compact CNN for low compute devices, utilizing pixel shuffling for efficient inferences. The study demonstrates that the CNN performs exceptionally well in terms of accuracy and performance, establishing its potential for real-time applications on low compute devices.
Article
Engineering, Biomedical
Dorsa Haji Ghaffari, Akwasi Darkwah Akwaboah, Ehsan Mirzakhalili, James D. Weiland
Summary: Retinal prostheses aim to improve visual perception in patients with photoreceptor degeneration-induced blindness, but the current limitations in shape and letter perception are due to low spatial resolution. Research has shown that better patient outcomes are correlated with spatially separate phosphenes. By using an optimization algorithm to find optimal stimulation parameters for focal RGC activation, the time required for optimizing implant operation can be reduced.
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING
(2021)
Article
Engineering, Biomedical
Kathleen E. Finn, Hans J. Zander, Robert D. Graham, Scott F. Lempka, James D. Weiland
IEEE OPEN JOURNAL OF ENGINEERING IN MEDICINE AND BIOLOGY
(2020)
Proceedings Paper
Engineering, Biomedical
Elena della Valle, James D. Weiland
2019 9TH INTERNATIONAL IEEE/EMBS CONFERENCE ON NEURAL ENGINEERING (NER)
(2019)
Article
Engineering, Biomedical
Elissa J. Welle, Paras R. Patel, Joshua E. Woods, Artin Petrossians, Elena della Valle, Alexis Vega-Medina, Julianna M. Richie, Cai Dawen, James D. Weiland, Cynthia A. Chestek
JOURNAL OF NEURAL ENGINEERING
(2020)