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32 results on '"Wang, Yizhong"'

8. Generalized Gaussian Multiterminal Source Coding: The Symmetric Case.

Author

Chen, Jun, Xie, Li, Chang, Yameng, Wang, Jia, and Wang, Yizhong

Subjects
SOURCE code, STATISTICAL correlation, ERROR-correcting codes, DATA compression
Abstract

Consider a generalized multiterminal source coding system, where $\binom{\ell }{ m}$ encoders, each observing a distinct size- $m$ subset of $\ell $ ($\ell \geq 2$) zero-mean unit-variance exchangeable Gaussian sources with correlation coefficient $\rho $ , compress their observations in such a way that a joint decoder can reconstruct the sources within a prescribed mean squared error distortion based on the compressed data. The optimal rate-distortion performance of this system was previously known only for the two extreme cases $m=\ell $ (the centralized case) and $m=1$ (the distributed case), and except when $\rho =0$ , the centralized system can achieve strictly lower compression rates than the distributed system under all non-trivial distortion constraints. Somewhat surprisingly, it is established in the present paper that the optimal rate-distortion performance of the afore-described generalized multiterminal source coding system with $m\geq 2$ coincides with that of the centralized system for all distortions when $\rho \leq 0$ and for distortions below an explicit positive threshold (depending on $m$) when $\rho > 0$. Moreover, when $\rho > 0$ , the minimum achievable rate of generalized multiterminal source coding subject to an arbitrary positive distortion constraint $d$ is shown to be within a finite gap (depending on $m$ and $d$) from its centralized counterpart in the large $\ell $ limit except for possibly the critical distortion $d=1-\rho $. [ABSTRACT FROM AUTHOR]

Published
2020
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10. A Lightweight Trust-Based Security Architecture for RPL in Mobile IoT Networks

Author

Naval Postgraduate School (U.S.), Thulasiraman, Preetha, Wang, Yizhong, Naval Postgraduate School (U.S.), Thulasiraman, Preetha, and Wang, Yizhong

Abstract

Military communities have come to rely heavily on commercial off the shelf (COTS) standards and technologies for Internet of Things (IoT) operations. One of the major obstacles to military use of COTS IoT devices is the security of data transfer. In this paper, we successfully design and develop a lightweight, trust-based security architecture to support routing in a mobile IoT network. Specifically, we modify the RPL IoT routing algorithm using common security techniques, including a nonce identity value, timestamp, and network whitelist. Our approach allows RPL to select a routing path over a mobile IoT wireless network based on a computed node trust value and average received signal strength indicator (ARSSI) value across network members. We conducted simulations using the Cooja network simulator and Wireshark to validate the algorithm against stipulated threat models. We demonstrate that our algorithm can protect the network against Denial of Service (DoS) and Sybil based identity attacks. We also show that the control overhead required for our algorithm is less than 5% and that the packet delivery rate improves by nearly 10%.

Published
2018

32. Theoretical and experimental studies of a surface acoustic wave flow sensor.

Author

Wang, Yizhong, Li, Zheng, Qin, Lifeng, Chyu, Minking, and Wang, Qing-Ming

Subjects
*ACOUSTIC surface wave devices, *DETECTORS, *FINITE element method, *SIMULATION methods & models, *RADIO frequency, *PREDICTION models, *SOUND pressure, *STRAINS & stresses (Mechanics)
Abstract

A novel SAW flow sensor is proposed based on pressure measurement. The relationship between the flow rate and the pressure difference along the flow path is evaluated. The results show a linear relationship between the flow rate and pressure difference, which agrees with the past research results. Strain analysis and FEM simulation show that phase delay depends linearly on the flow rate passing the SAW sensor, whereas SAW frequency decreases linearly upon the increase of flow rate. Phase delay experiment results agree with analysis and simulation, and the frequency change falls in a reasonable range around the predicted curve. [ABSTRACT FROM PUBLISHER]

Published
2012
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