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In mobile wireless sensor networks (MWSNs), each sensor has the ability not only to sense and transmit data but also to move to some specific location. Because the movement of sensors consumes much more power than that in sensing and communication, the problem of scheduling mobile sensors to cover all targets and maintain network connectivity such that the total movement distance of mobile sensors...
Nowadays, the problem of using minimum number of time slots for data aggregation such that sensors can work without data collision for data transmissions has received a great deal of attention in Wireless Sensor Network (WRSN). It is worth mentioning that there exists many approaches that are tried to reduce the number of time slots for data aggregation in WSNs. However, most of previous works are...
Because of the limited energies of sensors, efficient data gathering in wireless sensor network has been received a great deal of attention recently. To prolong the network lifetime, in this paper, we study the problem of scheduling a mobile sink to some specific nodes, termed anchor nodes in this paper, for data collection and reducing the energy consumption of data transmission. While considering...
Recently, the problem of using efficient the number of mobile devices starting from multi-sink to go to charge and collect data of sensors such that sensors can work forever has received a great deal of attention in Wireless Rechargeable Sensor Network (WRSN). Many methods have been proposed for the WRSN systems such that mobile device can charge and collect data from sensors. However, most of previous...
Recently, the problem of using efficient limited number of mobile devices to go to charge and collect data of sensors such that sensors can work forever has received a great deal of attention in Wireless Rechargeable Sensor Network (WRSN). Many methods have been proposed for the WRSN systems such that mobile device can charge and collect data from sensors. However, most of previous works often require...
With the implementation of European Union's restriction of hazardous substances directive, there is a sharp decline on electronic equipment corrosion resistance. The reason is that gaseous contaminations cause creep corrosion on printed circuit boards. Based on wireless sensor networks, three-dimensional space model, environmental information and computational fluid dynamics theory, an evaluation...
Recently, the major challenge in the design of wireless sensor networks is to enhance the network lifetime. Many researchers have studied the problem of constructing virtual backbones, which are the backbones used for different time periods, in order to prolong the network lifetime. In this paper, we study the problem of constructing virtual backbones in dual-radio wireless sensor networks to maximize...
Recently, sweep coverage, which is the problem of scheduling mobile sensors to periodically visit a certain number of points of interests (POIs) such that the number of mobile sensors is minimized and each of POIs can be visited periodically within a given time period, has received a great deal of attention in the wireless sensor networks. Many methods have been proposed for the sweep coverage to...
This paper presents a wide-range low-power fully integrated fractional-N PLL. The PLL consumes 1.13mW to 1mW at 1.2V supply voltage, in a wide frequency range from 1.7GHz to 2.5GHz. It achieves up to −115 dBc/Hz phase noise at 1MHz offset and up to 2.5 degrees RMS phase error. The settling time is 40µs. The PLL is implemented in 90nm CMOS. The PLL can be used for low power wireless body area network...
This paper presents an ultra-low-power (ULP) 2.3/2.4GHz multi-standard transmitter (TX) for wireless sensor networks and wireless body area networks. Several 2.3/2.4GHz wireless standards have been proposed for such applications, including IEEE802.15.6 (BAN) for body area networks, IEEE802.15.4 (Zigbee) and Bluetooth Low Energy (BLE) for sensor networks and IEEE802.15.4g (SUN) for smart buildings...
Recently, many researchers address on the problem of reducing power consumption for data aggregation in wireless sensor networks. However, many existing event-to-sink routing schemes for data aggregation require assistance from a global positioning system (GPS), which is not always available. In this paper, we propose a GPS-free event-to-sink routing scheme for data aggregation in wireless sensor...
Wireless sensor networks are often used to monitor and report the locations of moving objects. In light of storage in sensors, the wireless sensor network can be viewed as a distributed database for storing and retrieving the location information of objects. Many methods for the construction of the message-pruning trees have been studied to reduce the cost of updating databases and querying objects...
This paper presents a novel two-tier authentication and encryption scheme that explores the unique characteristics of Wireless Sensor Networks (WSN) in Healthcare Applications. The first phase authenticates among the sensor nodes of a Body Area Network (BAN) fused in a patient, where a U key is generated in a decentralized fashion. Based on the rule of separating user and platform credentials, U key...
In this paper, we propose a secure architecture for healthcare wireless sensor networks. After a careful examination of the security requirements and the security threats to healthcare sensor networks, we argue that security measures for Wireless Sensor Networks (WSN) must take application context in consideration rather than seek security solutions in a one-size-fits-all fashion. We integrate security...
In this paper, we propose a novel two-tier authentication scheme based on physiology. Our sensors are fused with a patient, where a physiological key is generated in a decentralized fashion. Secure aggregation and secure routing are deployed in the authentication procedure. This scheme lies on our unique secure architecture for Healthcare WSN that explores the characteristics of Healthcare WSN, departing...
The fundamental issue in the design of wireless sensor networks is to extend the life span of networks as much as possible. The data communications between nodes are the main consumer of energy. Data fusion plays a critically important role in reducing data communication amount and energy consumption in the nodes. In the paper, the residual energy in the nodes is regarded as the fusion object, and...
Data aggregation in wireless sensor networks eliminates data redundancy, thereby improving bandwidth usage and energy utilization. This paper presents a data aggregation algorithm, called MRDWA (Multi-Role Dynamic Weighting Aggregation), it mainly used in event driven WSN (Wireless Sensor Networks). MRDWA is based on cluster topology structure, and use different data aggregation algorithm according...
A wireless sensor network has unidirectional links because sensors can have different transmission ranges, sensors have unstable transmission ranges, and a hidden terminal problem exists. In this paper, we introduce a virtual coordinate assignment protocol (ABVCap_Uni) to assign virtual coordinates to nodes that have no geographic information in wireless sensor networks with unidirectional links,...
Summary form only given. We consider the problem of reliability modeling and analysis of hierarchical clustered wireless sensor networks (WSN) in this paper. We propose reliability measures that integrate the conventional connectivity-based network reliability with the sensing coverage measure indicating the quality of service (QoS) of the WSN. And we propose a progressive approach for evaluating...
The reliability of wireless sensor networks (WSN) depends on both network connectivity and sensing coverage. Common-cause failures (CCF) can contribute significantly to the WSN unreliability. This paper considers the problem of modeling and evaluating the coverage-oriented reliability of WSN subject to CCF. Our approach is computationally efficient due to the use of a progressive reduction scheme,...
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