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Human activity recognition using wearable sensors plays a significant role in many applications. How to accurately and quickly recognize various activities based on wearable sensors draws more and more attentions. This paper proposes an accelerated sparse representation classification method based on random projection and k-nearest neighbor for human activity recognition. Random projection is first...
Body activity recognition using wearable sensor technology has drawn more and more attentions over the past few decades. The complexity and variety of body activities makes it difficult to fast, accurately and automatically recognize body activities. To solve this problem, this paper formulates body activity recognition problem as a classification problem using data collected by wearable sensors....
Fast and accurately recognizing human activities is a major challenge in wireless body sensor networks. In this paper, with the help of wearable sensors, the recognition of human activities is well solved from a compressed sensing perspective. Our proposed method first compresses the original sensing data collected using wearable sensors by applying random projections on each sensor node before the...
Frequency hopping is one of the classic examples of spread-spectrum communications. This paper is about the study of the strategy of the synchronous recognition process. In other words, the topic is in which condition the hopping frequency in the receiver and transmitter can be identified. From the theoretical point of view, the more uniform frequency between the transmitter and the receiver, the...
In this paper, we propose a method of measuring aggressive driving behavior using driving signals from drive recorders. Drivers are assigned aggressiveness scores for four vehicle operation behaviors, i.e., steering, acceleration, deceleration, and alternation between acceleration and deceleration. A driver's overall aggressiveness score is then estimated by integrating these behaviors using multiple...
Based on the characteristic of uncertainty and multi-disturbance of variable-speed of SGIG for wind power generation system, a self-adaptive PID controller was proposed for harvesting the maximum power from wind. Self-adaptive parameters self-turning control and vector control were used via mathematical model of SCIG-wind energy generator system. The controller was designed in Matlab and dSPACE respectively...
In light of the multi-time scale characteristic of the wind velocity, and the normalized double-frequency model of wind energy conversion system (WECS), a linear parameter varying (LPV) model is established. The PI controller is used in the low-frequency loop, and the H∞ gain scheduling control method is adopted in the high-frequency loop. Simulation results depict that the coalition of double-frequency...
Visible light communications (VLC) are gaining popularity and may provide an alternative means of communications in indoor settings. However, to date, there is very little research on the deployment or higher layer protocol design for VLC. In this paper, we first perform channel measurements using a physical layer testbed in the visible light band to understand its physical layer characteristics....
We report the temperature dependent thermal properties of two types of GaN composite substrates (GaN-SiC and GaN-Si) using picosecond time-domain thermoreflectance (TDTR). The intrinsic thermal conductivity of the GaN buffer film decreases with increasing temperature, while the GaN-substrate thermal interface resistance (TIR) increases with increasing temperature. The strong temperature dependence...
We investigated a method to estimate the degree of driver awareness of surrounding vehicles based on the correlation between driver gaze direction and the risks caused by surrounding vehicles. The risks posed by surrounding vehicles were represented by their time to collision (TTC) from the driver's vehicle. We recorded driving data from five expert and five non-expert drivers while passing other...
Visible light communications (VLC) are becoming more and more popular and may provide an alternative means of communications in indoor settings. However, nowadays, there is very little study on the deployment or higher layer protocol design for VLC. In this paper, we perform extensive channel measurements using a physical layer testbed in the visible light band to understand its PHY layer characteristics...
Atmospheric scattering for ultraviolet signals enables non-line-of-sight communication of a transmitter-receiver pair on-the-move and adaptive network configuration. In this work, we first develop an experimentally validated path loss model which characterizes both multiple scattering and arbitrary pointing with noncoplanar geometry. Then we discuss how to achieve full duplexing. We suggest transmission...
As an alternative to radio-frequency (RF) communications, optical wireless communications (OWC) can support high data rates and low power operations while providing good jamming resistance. Our focus in this paper is on deep ultraviolet (UV) outdoor communications (UVOC) where solar blind and non-line-of-sight operations are attractive. Light beams from UV LED arrays serve as information carriers...
Cloud computing is usually defined to deliver infrastructure, platform and software as services, which is available as a pay-as-you-go model for users. A paradigm of Cloud computing for EDA service is presented in this paper, and a hierarchical architecture of Web-EDA system implemented with Cloud computing is described in detail. Based on this proposed system structure, we developed a prototype of...
An innovative application for communication platform based on SIP protocol is presented in this paper. In this application, a group management model is proposed for SIP with grouping functions. A new encryption mechanism that combines AES and RSA algorithm is included in this model to ensure the security of SIP messages. Different from the traditional application based on SIP, the architecture of...
In order to accomplish IC design online and project management, an enhanced unified electronic design automation (EDA) platform based on the WEB (abbreviated as WEB-EDA) is developed. The platform provides the sharing of cross-domain EDA resources via shell mode and desktop mode, IC design and project management. And for the purpose of safeguarding the online design environment, we adopt masquerade...
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