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Recently, rateless codes make a remarkable progress on achieving maximum network performance without incurring CSI feedback overhead, under dynamic contexts with time-varying channels. However, existing rateless codes are only optimal for single-carrier channels, but are far from optimal for multi-subcarrier OFDM channels that are dominantly adopted in modern high-speed wireless networks. In this...
In this paper, a novel low-profile circularly polarized crossed dipole antenna operating at UHF band, with small dimensions of 180 mm × 160 mm × 4 mm ( 0.22 λ × 0.20 λ × 0.005 λ) where λ is the wavelength corresponding to resonant frequency 370MHz, is proposed. Meandering lines are designed to reduce the size of the antenna. To achieve circularly polarized radiation pattern, a feeding network composed...
This work describes a method of preventing pneumonia in the hospital room by automatically quantifying how much and how often the patient is active out-of-bed using Microsoft Kinect V2. Hospital Acquired Pneumonia (HAP) is closely associated with patient activities during patient's hospital stay. From a perspective of the healthcare staff, it is very essential to know the quantity of the patient's...
The closed-form PO-PTD solution is presented to fast predict electromagnetic scattering from large-scale objects. The proposed closed-form formulation can avoid the intensive integral computation on surfaces and edges/wedges. Therefore, computation cost can be greatly reduced for electrically large structures. Numerical results show good accuracy and efficiency compared to those obtained from the...
Permissions-based security model of Android increasingly shows its vulnerability in protecting users' privacy information. According to the permissions-based security model, an application should have the appropriate permissions before gaining various resources (including data and hardware) in the phone. This model can only restrict an application to access system resources without appropriate permissions,...
A type of near-field antenna for RFID reader is proposed, which has folded-dipole antenna structure. A parasitic capacitance patch is inserted on the gap between two arms of folded-dipole antenna to adjust the antenna impedance. It's shown by simulation that near-field antenna is efficient to reduce antenna dimension for UHF RFID reader.
Exploring unknown environment by multi-robots brings the problem of partial maps integrating. In traditional methods, global map building is almost based on an estimate of robot pose (i.e., its position and orientation). In this paper we propose an improved approach without robots' pose information to integrate maps into a unified coordinate system. Line segment based geometric features in common...
The methods to select supply chain partners for a corporation is very important, especially for the complicated supply chain network with hundreds of members and multilevel structure , and the increasingly developing of evaluation criteria. According to the situation, we propose RVPK algorithm based on PSO (particle swarm optimization) and k-means clustering. The method is applied on clustering of...
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