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Steady, persistent effort has gone a long way toward bridging the infamous "terahertz gap." Advances in circuit and device design, as well as continued lithographic scaling, have delivered building blocks that are suitable for superheterodyne receivers in the sub-millimeter wave region. High-power (e.g., watt-level) sources for transmitters, however, remain to be developed. This talk uses...
This paper introduces a design principle for automatic cloth car wireless communication control system of mechanical equipment in metallurgy and mine. The system includes vehicle control system and a ground control system, installed on-board radar material level meter in cloth car bottom, photoelectric rotary encoder and the cloth wheel is coaxially connected, in cloth car body control device installed...
We present WRENSys, a system that allows for a low cost, rapidly deployable, large-scale and easy to maintain wireless mobile network, with minimal subject interference, to study contact networks of a population. We discuss our experiences with several hardware designs, including our new WREN sensor, base stations for charging and programming 2000 motes in parallel, software applications, and our...
This paper describes a robust, distributed, virtualized fault-tolerant framework for rapid response to catastrophic events such as earthquakes, land-slides, flooding, fire, and epidemics. The approach is distinguished in that fault tolerance in computing, communications, and storage, and the availability of relevant information content at the edge specific to the disaster scenario and location is...
Millimeter-waves offer the possibility of wide bandwidth and consequently high data rate for wireless communications. For both uni- and dual-polarized systems, signals sent over a link may suffer severe degradation due to antenna misalignment. Link robustness may be enhanced by the use of mutual orthogonality in three dimensions. In the general case of a Rician fading channel the inclusion of a third...
To improve the controllability within Future microgrids, a communication network needs to be available to provide data transfer within the MG. Wireless technologies such as ZigBee seem to be a good alternative for data transfer within MGs mainly due to low cost, more flexibility and acceptable data transfer rate. In such networks ZigBee-based repeaters are required to strengthen the communication...
The limited sensor node energy and the large number of nodes with dynamic network topology information have always been the important design concerns in Wireless Sensor Networks (WSN). Node clustering is an effective way to tackle with the two issues by grouping the nodes into hierarchies in order to reduce communication distance and the amount of message. This paper mainly focuses on the unification...
Aimed at the uneven energy consumption and data redundancy problem of the long-distance ribbon wireless sensor network, a cluster topology control algorithm is proposed based on the topology of ribbon wireless sensor network. The algorithm optimizes the cluster head selection mechanism and effectively guarantees sensor nodes with more residual energy and less communication cost as a cluster head....
Sink trees such as Breadth-First Search (BFS) or Shortest-Path Tree (SPT) are essential in Wireless Sensor Networks (WSNs) for various purposes such as data gathering, aggregation, clustering, and synchronization. These trees minimize the path-lengths reachable from root node to any other node in the network. With the energy-bound sensor nodes, it is vital to construct such trees in an effective manner,...
A GPS system selects routes between two points with minimum physical distance or minimum driving time. Here we address a different type of route selection problem. Given a road map with driving distance and wireless connectivity for each road segment, find a driving route that maximizes total wireless connectivity while its length is bounded by a predetermined value. In this paper, we present three...
Recent years have witnessed rapid development of Telehealth applications and the integration of portable devices to facilitate services such as Voice-over-IP (VoIP), Video-over-IP and distribution of other data types e.g., medical images and health sensor data. In line with Telehelath, Home Area Network (HAN) has also seen broad deployments and has expanded conventional households to support latest...
The paper presents a project, I-ECO, Inductive Charging Station for Ebike Clever Mobility. It consists of the development of integrated high-tech components for the design and implementation of eco-friendly cycle-stations making use of inductive charging systems or so-called ‘wireless’, with integrated photovoltaic generation systems, for the' power assisted bicycles. In particular, the project aims...
Opportunistic Routing (OR) [1] is a new promising paradigm, which has been proposed as a way to increase the performance of wireless networks by exploiting its broadcast nature. It benefits from the broadcast characteristic of wireless mediums to improve the network performance. In OR, instead of pre-selecting a single specific node to be the next-hop as a forwarder for a packet, multiple nodes, usually...
The recognition of human motions based on wireless sensor network technology has several obvious advantages. Since traditional recognition technology adopts a single wireless link, it is effective to identify whether an individual stays in a certain area. However, the technology fails to effectively recognize high-level human motions such as falling and lying down, which is of great importance for...
WLANs (Wireless Local Area Networks) are widely used for Internet access. But the WLANs in locations such as airports and large conventions usually suffer poor performance in terms of downlink TCP (Transmission Control Protocol) throughput To alleviate these problems, we propose an AFCP (Adaptive Flow Control Proxy) approach, which acts like a TCP Proxy and monitors the traffic flowing through the...
We propose a variable multi-pulse pulse-position-modulation (VMPPM) system with a dimming control that combines the use of pseudo-orthogonal codes and MPPM. In VMPPM, r slots are selected from n MPPM slots and codes for data are generated in each selected r slot according to source data equation [bit/frame]. This enables VMPPM to achieve a higher data-transmission rate than the conventional variable...
This paper proposes a hybrid infrastructure construction of multi-functions digital public address (PA) system, which consists of wired and wireless communications architecture. Wireless communications ability can be achieved by dedicated USB dongles such as WiFi, WiMax, 3G, and LTE. Wireless communication can be used for disaster areas or some regions where is difficult to install wired-based PA...
This paper presents a miniaturized rat-race coupler with harmonic suppression. The proposed coupler only takes 15.1% of the area of the corresponding conventional coupler. Design equations are derived for analysis. Finally, the proposed coupler is fabricated for experimental verification.
Wireless endoscopy systems is a new innovative method widely used for gastrointestinal tract examination in recent decade. Wireless Micro-Ball endoscopy system with multiple image sensors is the newest proposed method which can make a full view image of the gastrointestinal tract. But still the quality of images from this new wireless endoscopy system is not satisfactory. It's hard for doctors and...
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