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In this paper, two hybrid multi-hop/single-hop opportunistic transmission strategies for lifetime extension of WSNs are proposed. To prolong the network lifetime, a systematic model that contains a network distribution block, a routing algorithm block, a traffic pattern block and an optimal policy block is presented to determine the optimal transmission probability of each node. With the global routing...
This paper proposes the interaction physical-activity housekeeper (IPAH) in physical activity for silver-haired citizen. It consists of the pulse sound receiver (PSR), ergometer, bluetooth module, and smart phone. The silver-haired citizen has various physical activity levels can enhance the quality of life, cardiovascular fitness, and strength of lower limbs. Therefore, it is recommended that the...
This paper focuses on the performance measurement upon different terrains in 3D wireless sensor networks. We investigate the impacts of traffic load and operation mode in specific 3D terrains based on Durkin¡¦s propagation model. We also investigate the effects of different beacon interval and super frame duration in the IEEE 802.15.4 MAC super frame. Many comprehensive studies are shown by comparing...
In this paper, we present a wireless RF-powering electronics approach in an implantable biomedical microsystem with versatile sensors/actuators toward nanomedicine diagnosis and therapy applications. Miniaturized spiral coils as a wireless power module with low-dropout (LDO) linear regulator circuit convert RF signal into DC voltage provide a batteryless implantation for truly free-behavior monitoring...
We report an electronic-nose sensor node based on polymer-coated surface acoustic wave (SAW) sensor array for environmental monitoring applications. The sensor node consists of a SAW sensor array, its readout circuitry and a Wireless Sensor Network (WSN) platform. The 2 × 2 non-continuous gas SAW sensor array is coated with different polymer composite materials for different gas detection. The frequency...
Energy conservation is essential in wireless sensor networks (WSNs) because of limited energy in batteries. Collaborative beamforming uses multiple transmitters to form antenna arrays; the electromagnetic waves from these antenna arrays can create constructive interferences at the receiver and increase the transmission distance. Each transmitter can use lower power and save energy, since the energy...
It is critical to set up a precise and feasible monitoring system for a variety of animal or human studies. A behavioral state and physiological signal monitoring system was developed. Four EEG and three-axis accelerometer signals are acquired and transmitted to a host computer for further automatic analysis or visual review. The wireless communication based on IEEE 802.15.4/ZigBee frees the experimental...
Wireless sensor networks (WSNs) is composed of sink and many sensor nodes. It has the great scope to monitor environment and the characteristics of wireless communications. Relatively, the advantages of sensor node bring themselves some restrictions. The greatest challenge among those is the constraints on energy. The most critical issue is how to minimize the energy consumption for keeping target...
Collaborative beamforming has already demonstrated its potential of significant power savings in distributed sensor networks. In collaborative beamforming, the antennas of the sensor nodes form a distributed antenna array in an effort to direct the radiated energy to the desired direction and thus increase the overall power efficiency of the network. Existing studies, however, have not addressed several...
This paper presents an adaptive data collection (ADC) scheme with dynamic grid-length adjustment for mobile sinks in a grid-based wireless sensor network (WSN). Due to simultaneous collections of multiple mobile sinks, traffic distribution may become uneven and network congestion could occur. The proposed ADC can relieve the traffic by (i) adaptively adjusting transmission range between two primary...
A small world phenomenon has been discovered in a wide range of disciplines, such as physics, biology, social science, information system, computer networks, etc. In a wireless network, the small world phenomenon is used in the development of novel routing strategies. However, past studies made use of wire lines as shortcuts to construct a small world in a wireless network. First, it's difficult to...
Since the mass development of the wireless network, the advancement in wireless communications and micro-electronics element promote the development of wireless sensor networks (WSNs). The sensor nodes of WSNs have the following abilities such as: sensing, computation, and wireless communication capabilities. Hence, WSNs can be used for various application domains. Recently, the localization issue...
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