Jackson, Shannon P., Delin, Kevin A. · NASA STI Repository (National Aeronautics and Space Administration)
A Sensor Web formed of a number of different sensor pods. Each of the sensor pods include a clock which is synchronized with a master clock so that all of the sensor pods in the Web have a synchronized clock. The synchronization is carried out by first using a coarse synchronization which takes less power, and subsequently carrying out a fine synchronization to make a fine sync of all the pods on the Web. After the synchronization, the pods ping their neighbors to determine which pods are listening and responded, and then only listen during time slots corresponding to those pods which respond.
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Event-driven Architecture · 2013
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Michel Grothe, Jan Kooijman, Zoltan Papp et al. · Nederlandse Commissie voor Geodesie eBooks · 2008
With the rapid evolution of location technologies, wireless communication and sensors, it becomes increasingly feasible to identify and locate any valuable resource or individual in real time anywhere. This capability underlines a fundamental development: we are becoming increasingly used to know the 'where' of people or things, in a way that is similar to our general ability to know precise time. Organizations that adopt these technologies are faced with some fundamental questions, which are in part typical of early-stage technologies but which are magnified by the deep and pervasive implications of location and identification technologies and the internet of things. How will organization operate in a hyper-connected world? What will be the boundary between the inside and outside of an organization? How can the benefits and risks be assessed while there is a major uncertainty on technology and its acceptance? What does privacy mean when all information can be interrelated without individuals being aware of it? How should the organisation look at these developments and take the intrinsic long-term uncertainty into account for investment decisions? How do there developments affect the organisation mandate and its scope of activities? Should the organisation simply adapt to market developments or should it proactively influence how it evolves? Questions like these are at the core of any organisation that depends for its core activities on location and identification of people or goods or things. This paper illustrates a scenario analysis that tries to address these issues.
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Henson, Cory Andrew · Journal of Bioresource Management · 2008
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Amit Sheth, Cory Henson, Krishnaprasad Thirunarayan · Journal of Bioresource Management · 2008
Sensors are distributed across the globe leading to an avalanche of data about our environment. It is possible today to utilize networks of sensors to detect and identify a multitude of observations, from simple phenomena to complex events and situations. The lack of integration and communication between these networks, however, often isolates important data streams and intensifies the existing problem of too much data and not enough knowledge. With a view to addressing this problem, the semantic sensor Web (SSW) proposes that sensor data be annotated with semantic metadata that will both increase interoperability and provide contextual information essential for situational knowledge.
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Woolf A · Science and Technology Facilities Council
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A. J. Underbrink, Andrew Potter, K. Witt et al. · 2011
The research developed an architecture and experimental system for autonomously operating a web of Earth sensing devices. Example sensing devices include orbiting spacecraft, ground surface sensors, ocean surface sensors, ocean subsurface sensors, wheeled vehicles, fixed ground systems, weather balloons, and aircraft. A wide variety of sensors, sensor platforms, and operational characteristics (e.g., fixed versus mobile) required a common language for specifying and sharing data, information, and knowledge of the “sensor web”. An ontology was developed and used for collaboration between multiple sensor systems. The ontology is used by distributed agents to autonomously operate a sensor web in a distributed testbed. The system was also deployed and demonstrated on an orbiting satellite. The ontology models the application domain and the agent-based control system for the sensor web. The ontology was also used to implement the distributed agent system and to guide the design and development of the sensor web control system. The result is comprehensive model not only of the application domain, but also the control system for the application domain.
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Kirk Martinez, Ranzel U. Ong, Jane Hart et al. · ePrints Soton (University of Southampton) · 2004
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gamapvitor · 2023
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NASA/Goddard Space Flight Center Conceptual Image Lab · Bulletin of Miscellaneous Information (Royal Gardens Kew)
Smart Satellites Get a Closer Look - Along with semi-autonomous advancements in the RapidFire system, NASA is testing new integration techniques with the EO-1 spacecraft and its cutting edge ALI instrument. It works like this: when MODIS spots an area on the ground that may indicate fire, advanced software puts out an alert. That message essentially instructs ALI to point itself towards the zone of interest and get a close-up. If the resulting picture from this orbital dance shows risk for fire, the system can alert experts and officials to take action on the ground. The whole process is automated. That makes the observations and analysis fast, and in terms of fire management, speed counts. A system like this has the potential to greatly accelerate notification of potential trouble spots before they can get out of hand. Note: This is the standard definition version of the Senor Web: Smart Satellites animation MPEG. Animator: Susan Twardy (HTSI). Writer: Michael Starobin (HTSI), Sarah DeWitt (NASA/GSFC). Platforms/Sensors/Data Sets: Aqua/MODIS, EO-1/ALI, Terra/MODIS.
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Jirka, Simon, Rieke, Matthes · TIB KMO / FLOWWORKS GmbH · 2016
In the marine community, observation data sets are a critical input for many scientific questions. Thus, significant investments are made in equipment and data acquisition technology. To ensure that the collected data is efficiently used by a larger number of researchers, the interoperable sharing of observation data is getting more attention in recent time. This presentation introduces open source Sensor Web components from several European projects such as NeXOS, FixO3, BRIDGES and ODIP II that cover different requirements for Sensor Web technology in marine applications. On the one hand there are server-side tools such as the 52°North Sensor Observation Service which facilitate the publication and download of marine observations. On the other hand this is complemented by tools such as the 52°North JavaScript SOS Client, which offers a lightweight approach to explore and visualise observation data sets generated by mobile (e.g. research vessels) as well as stationary sensors (e.g. buoys). In our presentation we will introduce the basic principles of an interoperable Sensor Web infrastructure for Oceanology as well as show how this infrastructure can be implemented using the open source software components of 52°North. Simon Jirka (52°North Initiative for Geospatial Open Source Software GmbH) Matthes Rieke (52°North GmbH)
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Xingchen Chu, Rajkumar Buyya · 2007
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Yimin Shi, Guanyu Li, Xiaoping Zhou et al. · Communications in computer and information science · 2012
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Chang-Hong Park, Jungwon Cho, Do‐Hyeun Kim · Communications in computer and information science · 2012
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Hoan-Suk Choi, Woo-Seop Rhee · 2012
Recently, data on the web has been increased by interactive service, social media and the pervasive computing technology. To utilize these huge data include sensor data, semantic sensor web service platform is needed. And it can provide the context-aware semantic web service. But, because sensor generated data is so dynamic, it can't always update and store. Therefore, we propose the distributed semantic sensor web architecture to separate processing of context information and service information. This paper analyzes the requirements of semantic web of things and proposes the semantic sensor web service environment to provide user centric context-aware semantic web service through the semantic sensor web platform.
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Sarang Ardhapurkar, S. Sai Manjula, Y. Meena Kasturi · 2013
Abstract — The purpose of this project is to introduce a sensor web based application for public safety. We have heard of many incidents of stampedes and fire accidents taking place that result in a huge death toll. So it is becoming essential to find a viable solution to these incidents. This project aims at solving this problem by estimating the capacity of a room or a large open area. Object Detection Sensors are used detect the movement of people in and out of the site. This data is then sent to a remote server where some calculations take place and the exact count of people present in the room is determined. This value is then compared with the threshold value and if exceeded, a notification is sent to the authorities present at the site who can then take required action.
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Tarun Saxena, Ravi V. Bellamkonda · Nature Materials · 2015
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Gerard E Sleefe · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 2023
A system for electrically measuring variations over a flexible web has a capacitive sensor including spaced electrically conductive, transmit and receive electrodes mounted on a flexible substrate. The sensor is held against a flexible web with sufficient force to deflect the path of the web, which moves relative to the sensor.
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Danh Le-phuoc, Michael Hausenblas, Josiane Xavier Parreira et al. · 2009
Abstract. With the increasing popularity of sensor networks there has been a lot of effort in lifting the contents of such networks to a semantic level. This opens doors to the integration of sensor data with the more established semantic data sets, such as the Linked Open Data initiative, facilitating a wide range of new applications. However, the distributed, heterogeneous, real-time, and large scale nature of the data collections poses a big challenge. This project aims to build a platform for integrating sensor data with web data using linked data model. We first address the challenge of heterogenous data integration of dynamic data sources. Then we focus on how build efficient query processor over linked sensor stream data. Scalability is also an issue to be considered. This report describes the current status report of the work and the next steps of the project.
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Xingchen Chu, Rajkumar Buyya · 2008
The Sensor Web is an emerging trend which makes various types of web-resident sensors, instruments, image devices, and repositories of sensor data, discoverable, accessible, and controllable via the World Wide Web. A lot of effort has been invested in order to overcome the obstacles associated with connecting and sharing these heterogeneous sensor resources. This chapter emphasizes the Sensor Web Enablement (SWE) standard defined by the OpenGIS Consortium (OGC), which is composed of a set of specifications, including SensorML, Observation & Measurement, Sensor Collection Service, Sensor Planning Service and Web Notification Service. It also
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