A synchronous impulse network (SIN) is defined to be a network of spatially distributed wireless nodes employing UWB impulse transceivers whose oscillators are "ticking" at the same time/phase. In this research, the ultra-wide bandwidth of UWB signals is exploited to provide high resolution timing synchronization. The network node in the proposed synchronization scheme measures the time-of-arri...

Clock synchronization is a critical component in wireless sensor networks, as it provides a common time frame to different nodes. It supports functions such as fusing voice and video data from different sensor nodes, time-based channel sharing, and sleep wake-up scheduling, etc. Early studies on clock synchronization for wireless sensor networks mainly focus on protocol design. However, clock s...

We consider an anchor-free, relative localization and synchronization problem where a set of n receiver nodes and m wireless signal sources are independently, uniformly, and randomly distributed in a disk in the plane. The signals can be distinguished and their capture times can be measured. At the beginning neither the positions of the signal sources and receivers are known nor the sending mom...

ESCORT aims at decreasing the energy cost of communication in dense sensor networks. We employ radio frequency (RF) signal quality assessment in forming communities of redundant nodes. These communities avoid spanning regions of environmental interference to preserve the routing fidelity of the network. ESCORT is routing protocol-independent and conserves energy by alternating redundant nodes’ ...

PURPOSE The purpose of this preliminary study was to evaluate the usefulness of power Doppler sonography in differentiating metastatic from nonmetastatic cervical lymph nodes in patients with cancer. METHODS Histologically proved metastatic (n = 71) and nonmetastatic (n = 220) lymph nodes were examined with power Doppler sonography in 77 patients with head and neck cancer. Power Doppler sonog...

Powering the increasing number of sensor nodes used in Internet Things creates a technological challenge. The economic and sustainability issues battery-powered devices mean that wirelessly powered operation—combined with environmentally friendly circuit technologies—will be needed. Large-area electronics—which can based on organic semiconductors, amorphous metal oxide semiconducting carbon nan...

Wireless sensor networks (WSNs) are a number of sensitive nodes senses physical phenomenon at the position their deployment then sends information to base station take appropriate operation. used in many applications such track military targets, discover fires, study natural phenomena as earthquakes, humidity, heat, etc. The spread large areas and it is difficult locate them manually because th...

Ultrasmall superparamagnetic iron oxide contrast agents (USPIO) phagocytosed in lymph nodes provides a map of macrophage activity. MR imaging after USPlO injection has been used to demonstrate tumor infiltration as reduced or absent uptake. Our present study evaluated the utility of USPlO induced signal intensity changes in lymph nodes for staging patients with prostate cancer. Also assessed wa...

The work is devoted to the problem of frequency-selective signal conversion in microelectronic sensor devices. It has been shown that path such devices, particular, nodes concept Internet Things, must meet requirements embedded systems using a mixed analog-digital front end. analysis transformation photovoltaic sensors, particular significant parasitic influence extraneous non-informative optic...

background in the diagnosis of malignant lymph nodes (lns) and staging of lung cancer, sampling of mediastinal and hilar lns is essential. mediastinoscopy is known as the gold standard. convex probe (cp) endobronchial ultrasound (ebus)-guided transbronchial needle aspiration (tbna) is a noninvasive and highly sensitive diagnostic method in mediastinal and hilar ln sampling. objectives evaluatin...