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This paper describes an experimental minimally invasive surgical robot evaluation platform, in which a Phantom Omni haptic device is used as the master controller and a 7 degree-of-freedom Barrett arm is utilized as the biomimetic surgery robot manipulator. Remote center of motion (RCM) can be implemented by mechanical constraint or by virtual constraint. The mechanically constrained method employs...
In this paper, we have developed a robotic surgical system, which provides a low-cost, compact and modular structure for simulation and evaluation of tele-operation controller design. A 3D stereo vision tracking subsystem for the tele-surgery system has been proposed to render real-time surgery site image to the surgeon, while the tele-surgery subsystem enables the surgeon to perform tele-operations...
Massive MIMO is one of the most promising technologies for the fifth generation (5G) mobile communication systems. In order to better assess the system performance, it is essential to build a corresponding channel model accurately. In this paper, a three-dimension (3D) two-cylinder regular-shaped geometry-based stochastic model (GBSM) for non-isotropic scattering massive MIMO channels is proposed...
The generation of representative computer system behavior profile from system calls in LINUX environments to establish reliable Host Based Anomaly Detection Systems (HADS) against Next Generation of Attacks (NGA) is a challenge due to two major reasons. Firstly, NGA causes a low footprint upon host activities and consequently, attack activities are difficult to detect from normal computer processes...
We analytically model an unreliable opportunistic spectrum sharing (OSS) system through a queueing theoretic framework. Both initiating secondary users and ongoing secondary users sense the channels and perform appropriate activities. The sensing errors from either initiating or ongoing secondary users cause false alarm and misdetection events, which may impose different types of call collision results...
Due to geometric nonlinearity, stress waves of one-dimensional granular chains behave as highly nonlinear solitary waves. Those waves can support a high level of amplitude over a long distance and have an important engineering value for detecting structure properties. Deflection can be caused by the impact of a granular bead with large plates. Based on Hertz's law, using the theory of intrinsic inelasticity...
Feed drives are one of the most important parts of machine tools. Their static and dynamic behavior strongly influences the positioning accuracy and their speed determines productivity. The control parameters play a decisive role concerning the performance of the mechatronic system and for control analysis, a sufficient model of the feed drive system is necessary. This paper demonstrates the structure...
The combination of zinc oxide (ZnO) thin film and anodized aluminum oxide (AAO) with the assistance of atomic layer deposition (ALD) technique is performed to investigate into the luminescence tailoring effect and mechanism of such a light emitting device, considering the strong luminescence of both ZnO and AAO nanostructures. Nanoscale ZnO thin films were deposited by ALD into the nanopores of AAO...
Wireless Network Card (WNC) manufacturers are capable of implementing algorithms in the IEEE 802.11 protocol dynamically. This fact may allow some WNCs to occupy channels in illegal ways with the purpose of delivering data at higher rates. In order to prevent this occurrence, it is important to develop methodologies to identify anomalies of WNC behavior. In the experiments discussed here, we demonstrate...
This paper explores, for the first time, the use of high responsivity heterostructure backward tunnel diodes to enhance the conversion efficiency of ambient microwave power harvesters. Progress in advancing the performance of low power rectifiers has been slowed because the maximum possible efficiency using Schottky diodes has been reached. Measurements of RF-to-DC conversion efficiency at −40dBm/2...
Available bandwidth estimation is an effective way to understand the situations of networks and applications. The packet pair technique analyzes the inter-arrival time of packet pair for the available bandwidth estimation in an end-to-end path. The inter-arrival time of packet pair is mostly caused by the queuing delay of narrow link which is sensitive to cross traffic. This paper proposes a new method...
This paper reports on the design and performance of a terahertz (THz) linear camera with 50 pW/√Hz noise-equivalent power (NEP). This camera is sensitive to four bands of vertically and horizontally polarized THz radiation (0.22, 0.32, 0.42, and 0.52 THz). The heart of the camera is a diode-based focal plane array (FPA) that has a 10 nV thermal noise level and 1–2 kV/W sensitivity across the four...
Socio-technical systems (STSs) consist of human, hardware and software agents that work in tandem to fulfill stakeholder requirements. A specification for an STS consists of a set of (social) commitments among participating agents that serve as a contract among them. However, by their very nature, STSs are open, dynamic and continuously evolving along with their environments. To ensure that such systems...
Human exposure to low frequency (LF) magnetic fields (MF) is frequently evaluated according to ICNIRP guidelines. Standing adults are used to determine the compliance of the standards. Nevertheless, the conservativeness of the standard for the other populations, such as the minors, has been questioned and investigated by various studies using the realistic or symbolized human models. Meanwhile, the...
In this paper, a novel frequency selective surface (FSS) using random distribution method is investigated. This FSS can diffuse the reflected wave analogy to array antenna. The reflectivity of three-layer stacked cross patches are studied at first. Then an array of 20×20 FSS is constructed and simulated. Finally a 300mmx300mm three-layer random surface is fabricated and measured. More than 5dB RCS...
This paper discusses the design of high-speed low-power decimation filter for wideband Delta-Sigma ADC. It presents a low power decimation filter with programmable decimation ratios (32, 64 and 128) and sampling rates (624MHz, 312MHz and 208MHz) for LTE application. The decimation filter has five different operating modes and consists of three sinc filters, two halfband filters and a FIR filter. It...
In this paper, we aimed to investigate the possible interactions between human brain and radiofrequency electromagnetic fields (EMF) with electroencephalogram (EEG) technique. Unlike the previous studies which mainly focused on EMF effect on local brain activities, we attempted to evaluate whether the EMF emitted from Long Term Evolution (LTE) devices can modulate the functional connectivity of brain...
With the explosion of social media on the Web, significant efforts have been dedicated to the research on social image retrieval and ranking. However, most existing social image ranking methods are disturbed by noisy tags which brings a strong need to find some complementary information for image ranking. Thanks to the rapid development of mobile devices, online social images increasingly attached...
Online learned tracking is widely used to handle the appearance changes of object because of its adaptive ability. Learning to rank technique has attracted much attention recently in visual tracking. But the tracking method with online learning to rank suffers from the error accumulation problem during the self-training process. To solve this problem, we propose an online learning to rank algorithm...
Real time visual tracking is a challenge problem in computer vision. In this paper, we propose a real-time tracking method based on compressive sensing Markov Chain Monte Carlo (MCMC) sampling. To extract the features of objects, non-adaptive random projections are employed in the object appearance model which adopts a very sparse random measurement matrix using compress sensing. These projection...
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