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With the advancement in wireless sensor networks (WSN) researchers in social network analysis (SNA) now have access to larger and more complex datasets that describe human interactions in the physical space. Studies in WSN thrive on accuracy and robustness whereas SNA operates on a higher level of data abstraction. Graph mining is a bridge between these two fields. This paper investigates two approaches...
Sensor data with geographical information become ubiquitous with development of location base applications in various businesses. There is no exception to Wireless sensor network (WSN) as it is getting more practical under the booming of semiconductor industry. Localization of WSN usually depends on beacons that equip with GPS or GSM module. The cost of finance and energy hamper the application of...
Advances in wireless communication and microelectronic devices technologies have achieved the success production of low-power micro-sensors, enabling the large scale deployment of wireless sensor networks (WSNs). In order to track objects energy efficiently in OTSNs, many methods have been proposed but the performance is still not satisfactory. In fact, improving the performance of flooding is necessary...
Processing spatio-temporal queries pertaining to the whereabouts of a large number of mobile entities has traditionally been the topic of the Moving Objects Databases (MOD)research. More recently, due to the advances in sensing and communication technologies, part of the Wireless Sensor Networks(WSN) applications have focused on tracking of mobile objects. These two observations are enough of to warrant...
Data dissemination and discovery is critical for ad-hoc wireless sensor networks. Most existing research depends on location information that is not always obtained easily, efficiently and accurately. We propose the concept of Contour-cast, a location-free data dissemination and discovery approach for large-scale wireless sensor networks. One important property of Contour-cast is that it does not...
To alleviate the data collection latency problem in mobile WSNs, we shorten the data collection path by visiting a minimal set of points in the network, which we call the {\it Stop Point Set} (SPS). A point selection method named path-points identification method has been proposed recently, which plays the same role as our SPS calculating method. However, as a clustering based method, it may not scale...
A lot of research has been done in finding range-based methods such as computing RSSI, time of arrival, angle of arrival or time difference of arrival and range-free methods such as centroid computation, DV-hop and approximate position in triangle, for localization in wireless sensor networks. Range-based methods estimate location more precisely than range-free methods. However, range-free methods...
Wireless sensor networks experience a number of problems not found in wired networks, such as limited power resources, location identification and message routing in a wireless medium. Analysis of small world networks have shown that it is possible to transmit information from one node to another node some random distance away within a small number of hops (i.e. small world networks have a small diameter)...
Given a space where some events occur and expect to be detected, and a group of devices with limited sensing and communication capabilities moving in this space, this paper aims at developing a distributed self-deployment algorithm for each agent so that the steered sensing device network can cover and sample the space in interest. At the same time, to support the collection and further processes...
Providing forward and backward secrecy is still a big challenge in unattended wireless sensor networks (UWSNs), though some storage schemes have been proposed. Additionally, high storage requirement needs efficient storage techniques. In this paper, we propose a novel homomorphic encryption and key-evolution based scheme for efficient and secure data storage, which supports both forward and backward...
In this paper we propose centralized feedback control laws for mobile sensor networks so that sensor trajectories cover a given domain as uniformly as possible. The design of the feedback law is based on a measure for uniformity of the trajectories given as a distance between a certain delta-like distribution on the trajectories and a desired probability distribution. The design of control is of Lyapunov-type...
This paper addresses the problems of barrier coverage and sweep coverage in a corridor environment by a network of self-deployed mobile autonomous sensors. Using the ideas of nearest neighbor rules, we propose a decentralized motion coordination algorithm for the sensors to solve the coverage problems. Numerical simulations illustrate the effectiveness of the proposed algorithm. The results in this...
In sensor network applications, data gathering mechanisms, which are based on multi-hop forwarding, can be expensive in terms of energy. This limitation challenges the use of sensor networks for applications that demand a predefined operational-lifetime. To avoid this problem, using of mobile element (ME) as a mechanical data carrier has emerged as a promising approach. However, practical considerations...
It is a basic application-supported technique to realize dynamic location. In order to make the precise locating method which is rather susceptible to the precise of the clock by the electromagnetic ranging ways only fit the continuous changing of the neighbor anchor nodes especially in the anchor-node-deficiency situation in which all the nodes move randomly in the environment where the electromagnetic...
This paper presents a new context awareness service decision method based on fuzzy set theory and the knowledge discovery technique in rough set theory. The established system model in the paper provides users with a service list ranking according to possibilities of each service that users may need. Moreover, accuracy of decision rules can conclude from the system model.
The mobility of nodes with a purpose called as robotic-mobility is used for replenishing energy to strategic military applications. Assuming a CDS based backbone in place, we give a technique of maintaining the location of mobile node for a given topology setting. We show that using a weighted CDS reduces the maintenance of location updates for mobile node. The complexity of our mobile-node maintanence...
In the context of sensor and ad hoc networks, wireless networking systems with mobile sensors have been studied enthusiastically for the applications to habitat and environment monitoring, and information communications between vehicles and portable devices. Since mobile objects move randomly and communicate each other wirelessly only on close ranges, it is possible to happen frequent disconnection...
We illustrate the effective use of ATIM (ad hoc traffic indication message) window in static sensors to obtain potential energy savings for sensors during data dissemination in wireless sensor networks. The network consists of resource-rich mobile sink node and resource-constrained sensor nodes forming a square grid. Sink may be multihop away from the sensor nodes and in order to collect the data,...
Many shortcomings in radio frequency identification (RFID) systems stem from the underlying communication architecture; affecting performance, scalability and usability. This paper remedies such hindrance by introducing the novel paradigm of distributed receiving in RFID systems. The proposed scheme entails dispersing the routine functions of conventional readers onto spatially distributed entities,...
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