A5062597647- Indoor and Outdoor Localization Technologies
- Speech and Audio Processing
- Wireless Networks and Protocols
- Asymmetric Synthesis and Catalysis
- Chemical Synthesis and Reactions
- Molecular spectroscopy and chirality
- Therapeutic Uses of Natural Elements
- Coordination Chemistry and Organometallics
- Dialysis and Renal Disease Management
- Ionic liquids properties and applications
- Underwater Vehicles and Communication Systems
- Blood properties and coagulation
- Axial and Atropisomeric Chirality Synthesis
- Analytical Chemistry and Chromatography
- Millimeter-Wave Propagation and Modeling
- Context-Aware Activity Recognition Systems
- Human Mobility and Location-Based Analysis
University of South Carolina Sumter
2021-2025
University of Electronic Science and Technology of China
2019-2022
University of Akron
2021
A lone pair-π interaction was employed to alter the reactivity of three isochalcogenourea catalysts in a model silylation reaction. Even though is relatively weak interaction, working cooperatively with bond-forming step allowed catalyst over inherent nucleophilicity an alcohol
Device-free localization based on WiFi Channel State Information (CSI) has attracted considerable attention in recent years. Many of the schemes are learning-based, among which CSI fingerprinting deep learning is most promising. Learning-based assume distributions fingerprints keep relatively stable over time. However, this assumption often does not hold. As signals prone to be influenced by various environmental factors, vary significantly with changes. Consequently, model built for...
Human tracking is of key importance to a variety applications. Different from the previous approaches requiring targets carry electronic devices, this paper proposes device-free method based on WiFi channel state information (CSI) through deep neural networks (DNN) and particle filtering (PF). In area covered with WiFi, human movements may cause observable variations signals. By analyzing CSI fingerprint patterns modeling dependency between fingerprints locations DNN, proposed able localize...
Abstract Chiral and achiral substituted isothiourea catalysts were synthesized employed in model silylation reactions to understand how changing the electronics on catalyst core affected intermolecular interactions between intermediates substrates, ultimately affecting selectivity rate. Five different chiral utilized a silylation‐based kinetic resolution of 2‐(para substituted)phenylcyclohexanols rate these same alcohols was investigated with three catalysts. Linear free energy relationships...
People flow counting is to count the number of people passing through a passage or gate. Conventional vision-based approaches require line-of-sight (LoS) and impose privacy concerns, while most radio-based dedicated equipment incur high cost. In this article, we propose exploit commodity WiFi continuous flows in device-free way, requiring one pair transmitter receiver. Leveraging Doppler effect induced by human passing, proposed method, named WiFlowCount, first constructs spectrogram shifts...
Rates of isothiourea catalyzed silylation and acylation reactions were measured for substrates with various electronic substituents at the aryl group. Through these measurements, intermolecular interactions between cationic catalyst intermediates different groups explored. These studies performed to understand how changes in structure affected electrostatic interactions. Three catalysts (N-methylimidazole two isothioureas) employed that varied their ability delocalize nature. The results...
Security is of vital importance in public places. Detection suspicious objects such as metal and liquid often requires dedicated expensive equipment, preventing its wide deployment. This paper proposes a pervasive device-free method to detect concealed by walking pedestrians using WiFi Channel State Information (CSI). By analyzing the different variations subcarrier amplitude caused materials, proposed able pedestrians, when they walk through transmission link transmitter receiver. The...
Micelles formed within coacervate phases can impart functional properties, but it is unclear if this micellization provides mechanical reinforcement of the whereby micelles act as high functionality crosslinkers. Here, we examine how sodium dodecyl sulfate (SDS) influences structure and properties Pluronic F108-polyacrylic acid (PAA) coacervates SDS known to decrease aggregation number micelles. Increasing concentration leads larger water content in an increase relative PAA other solids....
The development of wireless technology has triggered sensing. Most WiFi sensing methods are data driven and learning based. They face two major drawbacks: 1) a large number labeled samples required to train the model; 2) model depends on training environment degrades dramatically in different environment. To mitigate these problems, we propose domain adaptation method achieve robustness for channel-state-information-based activity recognition with sparsely samples. method, named cross-domain...
The mechanism of the asymmetric silylation alcohols with isothiourea catalysts was studied by employing reaction progress kinetic analysis. These reactions were developed Wiskur group, and use triphenyl silyl chloride chiral to silylate alcohols. While order most components as expected (catalyst, amine base, alcohol), determined be a higher order. This suggested multistep between catalyst chloride, second equivalent assisting in formation reactive intermediate leading rate-determining step....