Abstract—Wireless sensor networks are evolving from dedicated application-specific platforms to integrated infrastructure shared by multiple applications. Shared sensor networks offer inherent advantages in terms of flexibility and cost since they allow dynamic resource sharing and allocation among multiple applications. Such shared systems face the critical need for allocation of nodes to contending applications to enhance the overall Quality of Monitoring (QoM) under resource constraints. To address this need, this paper presents Utility-based Multiapplication Allocation and Deployment Environment (UMADE), an integrated application deployment system for shared sensor networks. In sharp contrast to traditional approaches that allocate applications based on cyber metrics (e.g., computing resource utilization), UMADE adopts a cyber-physical system approach that dynamically allocates nodes to applications based on their QoM of the physical phenomena. The key novelty of UMADE is that it is designed to deal with the inter-node QoM dependencies typical in cyber-physical applications. Furthermore, UMADE provides an integrated system solution that supports the end-to-end process of (1) QoM specification for applications, (2) QoM-aware application allocation, (3) application deployment over multi-hop wireless networks, and (4) adaptive reallocation of applications in response to network dynamics. UMADE has been implemented on TinyOS and Agilla virtual machine for Telos motes. The feasibility and efficacy of UMADE have been demonstrated on a 28-node wireless sensor network testbed in the context of building automation applications. I.

Abstract—In this paper, we study deployment patterns to achieve full coverage and k-connectivity (k 6) under different ratios of the sensor communication range (denoted by Rc)to the sensing range (denoted by Rs) for homogeneous wireless sensor networks (WSNs). In particular, we propose new patterns for 3- and 5-connectivity. We also discover that there exists a hexagon-based universally elemental pattern that can generate all known optimal patterns. The previously proposed Voronoi-based approach cannot be applied to prove the optimality of the new patterns due to their special features. We propose a new deployment-polygon-based methodology. We prove the optimality of deployment patterns to achieve 3-connectivity, 4-connectivity, and 5-connectivity for certain ranges of Rc=Rs, respectively, and prove the optimality of deployment patterns to achieve 6-connectivity under all ranges of Rc=Rs. Index Terms—Connectivity, coverage, network topology, optimal deployment pattern, wireless sensor networks (WSNs). I.

Abstract—This paper 1 describes the design of a wireless urban sensor network testbed, CitySense. This first-of-its-kind testbed enables wireless networking researchers to perform repeatable experiments in a real-world environment. Studies that were previously limited to simulation and the laboratory can be validated through long-lived experiments in real-world environments. Unlike prior, mote-based sensor networks, CitySense nodes have a high powered CPU with large persistent storage and highbandwidth radios to support multiple user applications. First, we describe the testbed and the unique design considerations required by its urban deployment. Second, we present results from a measurement study to characterize the performance of the radio-frequency links. Our results show that: (a) existing empirical models accurately predict the bounds on RF link lengths (b) the 2.4 GHz radio exhibits a lower pathloss exponent than the 900 MHz radio (α = 3.4 vs. α = 3.75); and (c) RSS is only a modest predictor of link throughput, R 2 = 0.77. Finally, we describe future studies planned for the testbed. I.

Abstract—We consider the simplest IEEE 802.11 WLAN networks for which analytical models are available and seek to provide an experimental validation of these models. Our experiments include the following cases: (i) two nodes with saturated queues, sending fixed-length UDP packets to each other, and (ii) a TCP-controlled transfer between two nodes. Our experiments are based entirely on Aruba AP-70 access points operating under Linux. We report our observations on certain non-standard behavior of the devices. In cases where the devices adhere to the standards, we find that the results from the analytical models estimate the experimental data with a mean error of 3-5%. I.

Abstract. This paper proposes Speed-dependent information retrieving schema for efficient navigation in large-scale sensor networks. It enables us to adjust area for sensing and to acquire information for appropriate details. In our system, environmental information is visualized by integrating with a map and localized by using a mesh-network. People understand a surrounding situation, and will be able to take an appropriate action by using the system. Key words: sensor networks, location-dependent services, navigation, ITS 1

Abstract. The increasing popularity of location based social services such as Facebook Places, Foursquare and Google Latitude, solicits a new trend in fusing social networking with real world sensing. The availability of a wide range of sensing technologies in our everyday environment presents an opportunity to further enrich social networking systems with fine-grained real-world sensing. However, the introduction of passive sensing into a social networking application disrupts the traditional, user-initiated input to social services, raising both privacy and acceptability concerns. In this work we present an empirical study of the introduction of a sensor-driven social sharing application within the working environment of a research institution. Our study is based on a real deployment of a system that involves location tracking, conversation monitoring, and interaction with physical objects. By utilizing surveys, interviews and experience sampling techniques, we report on our findings regarding privacy and user experience issues, and significant factors that can affect acceptability of such services by the users. Our results suggest that such systems deliver significant value in the form of self reflection and comparison with others, while privacy concerns are raised primarily by the limited control over the way individuals are projected to their peers. 1

umshing,Shillong, India In this paper we present novel methods of energy efficient environment sensing in a very cost effective manner by a method called smart sensor switching. We have extracted the requirements of sensor switching and implemented various intelligent energy efficient protocols like dynamic sensor switching, sensor handover in the hardware platform which makes the sensing mechanism uninterrupted and highly energy efficient. The prototype hardware consists of five different gas sensors which are operated by centralized peripheral interface controller (PIC) based embedded system platform. The paper also describes a practical sensor switching mechanism with real time data, various dynamic and non dynamic sensor parameters have been considered in the designing scenario.

The advancement of smart sensor technology has allowed us to design and development of a flexible reliable smart gas detection system to detect gases such as combustible air contaminants in the environment. The system composed of three modules the base station, wireless sensor array, and an intelligent wireless alarm unit which offers high reliability, flexibility and uninterrupted sensing, these are achieved by incorporating various intelligent protocols like auto sensor calibration, sensor handover, wireless threshold fixation and intelligent alarm mechanism, the sensor node consists of three gas sensor, one temperature sensor and one pyro-electric infrared sensor (PIR) which enhance the sensing intelligence. Sensed data digitized and processed by peripheral interface controller (PIC) 16f877A based centralized embedded platform and wireless communication is achieved with a pair of 433 and 315 MHz amplitude shift keying (ASK) wireless module. The encoding and decoding of sensed data offer a high secure gas detection system.

As Wireless Sensor Networks have emerged as an exciting new area of research, testbeds have become the preferred basis for experimentation. In such testbeds, getting correct experimental result is essential. To address this need, we have developed a testbed termed as SRMSenseNet which consists of sensor nodes connected to a testbed server facilitating remote access to users. In this paper, we have proposed an easy data retrieval mechanism which helps to store the structured data results in the testbed. Additionally by providing web interfaces, our testbed allows the users to reserve their sensor motes. Users can experiment with real hardware resources and interact with our testbed in real-time.

Abstract—Computer-enhanced smart environments, distributed environmental monitoring, wireless communication, energy conservation and sustainable technologies, ubiquitous access to Internet-located data and services, user mobility and innovation as a tool for service differentiation are all significant contemporary research subjects and societal developments. This position paper presents the design of a hybrid municipal network infrastructure that, to a lesser or greater degree, incorporates aspects from each of these topics by integrating a community-based Wi-Fi access network with Wireless Sensor Network (WSN) functionality. The former component provides free wireless Internet connectivity by harvesting the Internet subscriptions of city inhabitants. To minimize session interruptions for mobile clients, this subsystem incorporates technology that achieves (near-)seamless handover between Wi-