WorldWideScience
 
 
1

Flow Webs: Mechanism and Architecture for the Implementation of Sensor Webs  

Science.gov (United States)

The sensor web is a distributed, federated infrastructure much like its predecessors, the internet and the world wide web. It will be a federation of many sensor webs, large and small, under many distinct spans of control, that loosely cooperates and share information for many purposes. Realistically, it will grow piecemeal as distinct, individual systems are developed and deployed, some expressly built for a sensor web while many others were created for other purposes. Therefore, the architecture of the sensor web is of fundamental import and architectural strictures that inhibit innovation, experimentation, sharing or scaling may prove fatal. Drawing upon the architectural lessons of the world wide web, we offer a novel system architecture, the flow web, that elevates flows, sequences of messages over a domain of interest and constrained in both time and space, to a position of primacy as a dynamic, real-time, medium of information exchange for computational services. The flow web captures; in a single, uniform architectural style; the conflicting demands of the sensor web including dynamic adaptations to changing conditions, ease of experimentation, rapid recovery from the failures of sensors and models, automated command and control, incremental development and deployment, and integration at multiple levels—in many cases, at different times. Our conception of sensor webs—dynamic amalgamations of sensor webs each constructed within a flow web infrastructure—holds substantial promise for earth science missions in general, and of weather, air quality, and disaster management in particular. Flow webs, are by philosophy, design and implementation a dynamic infrastructure that permits massive adaptation in real-time. Flows may be attached to and detached from services at will, even while information is in transit through the flow. This concept, flow mobility, permits dynamic integration of earth science products and modeling resources in response to real-time demands. Flows are the connective tissue of flow webs—massive computational engines organized as directed graphs whose nodes are semi-autonomous components and whose edges are flows. The individual components of a flow web may themselves be encapsulated flow webs. In other words, a flow web subgraph may be presented to a yet larger flow web as a single, seamless component. Flow webs, at all levels, may be edited and modified while still executing. Within a flow web individual components may be added, removed, started, paused, halted, reparameterized, or inspected. The topology of a flow web may be changed at will. Thus, flow webs exhibit an extraordinary degree of adaptivity and robustness as they are explicitly designed to be modified on the fly, an attribute well suited for dynamic model interactions in sensor webs. We describe our concept for a sensor web, implemented as a flow web, in the context of a wildfire disaster management system for the southern California region. Comprehensive wildfire management requires cooperation among multiple agencies. Flow webs allow agencies to share resources in exactly the manner they choose. We will explain how to employ flow webs and agents to integrate satellite remote sensing data, models, in-situ sensors, UAVs and other resources into a sensor web that interconnects organizations and their disaster management tools in a manner that simultaneously preserves their independence and builds upon the individual strengths of agency-specific models and data sources.

Gorlick, M. M.; Peng, G. S.; Gasster, S. D.; McAtee, M. D.

2006-12-01

2

A Service Oriented Architecture to Enable Sensor Webs  

Science.gov (United States)

This paper describes work being performed under a NASA Earth Science Technolgy Office grant to develop a modular Sensor Web architecture which enables discovery and generic tasking capability for sensors, both space-based and insitu. This work builds on previous sensor web efforts conducted at NASA/GSFC using the Earth Observing 1 and other satellites. Furthermore, it seeks to make use of other emerging standards such as GSFC Mission Services Evolution Cneter (GMSEC), Instrument Remote Control (IRC), Core Flight Executive (cFE) and various Open Geospatial Consortium (OGC) Sensor Web Enablement (SWE) standards. The paper will describe intial results from participation in the OGC Webservices 4 (OWS-4) testbed demonstrations. Also, the planned future activities and extensions to the OWS-4 demonstration will be presented along with its application in helping to manage various disasters such as wildfires or for use in volcano observation campaigns. Finally, we will present how these capabilities will help to facilitate the United States contribution to the Global Earth Observing System of Systems(GEOSS) .

Mandl, D.; Sohlberg, R.; Justice, C.; Frye, S.; Chien, S.; Ames, T.; Ungar, S.

2006-12-01

3

Ontology Alignment Architecture for Semantic Sensor Web Integration  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Sensor networks are a concept that has become very popular in data acquisition and processing for multiple applications in different fields such as industrial, medicine, home automation, environmental detection, etc. Today, with the proliferation of small communication devices with sensors that collect environmental data, semantic Web technologies are becoming closely related with sensor networks. The linking of elements from Semantic Web technologies with sensor networks has been called Sema...

Bernardo Alarcos; Ivan Marsa-Maestre; Susel Fernandez; Velasco, Juan R.

2013-01-01

4

Ontology alignment architecture for semantic sensor Web integration.  

Science.gov (United States)

Sensor networks are a concept that has become very popular in data acquisition and processing for multiple applications in different fields such as industrial, medicine, home automation, environmental detection, etc. Today, with the proliferation of small communication devices with sensors that collect environmental data, semantic Web technologies are becoming closely related with sensor networks. The linking of elements from Semantic Web technologies with sensor networks has been called Semantic Sensor Web and has among its main features the use of ontologies. One of the key challenges of using ontologies in sensor networks is to provide mechanisms to integrate and exchange knowledge from heterogeneous sources (that is, dealing with semantic heterogeneity). Ontology alignment is the process of bringing ontologies into mutual agreement by the automatic discovery of mappings between related concepts. This paper presents a system for ontology alignment in the Semantic Sensor Web which uses fuzzy logic techniques to combine similarity measures between entities of different ontologies. The proposed approach focuses on two key elements: the terminological similarity, which takes into account the linguistic and semantic information of the context of the entity's names, and the structural similarity, based on both the internal and relational structure of the concepts. This work has been validated using sensor network ontologies and the Ontology Alignment Evaluation Initiative (OAEI) tests. The results show that the proposed techniques outperform previous approaches in terms of precision and recall. PMID:24051523

Fernandez, Susel; Marsa-Maestre, Ivan; Velasco, Juan R; Alarcos, Bernardo

2013-01-01

5

Ontology Alignment Architecture for Semantic Sensor Web Integration  

Directory of Open Access Journals (Sweden)

Full Text Available Sensor networks are a concept that has become very popular in data acquisition and processing for multiple applications in different fields such as industrial, medicine, home automation, environmental detection, etc. Today, with the proliferation of small communication devices with sensors that collect environmental data, semantic Web technologies are becoming closely related with sensor networks. The linking of elements from Semantic Web technologies with sensor networks has been called Semantic Sensor Web and has among its main features the use of ontologies. One of the key challenges of using ontologies in sensor networks is to provide mechanisms to integrate and exchange knowledge from heterogeneous sources (that is, dealing with semantic heterogeneity. Ontology alignment is the process of bringing ontologies into mutual agreement by the automatic discovery of mappings between related concepts. This paper presents a system for ontology alignment in the Semantic Sensor Web which uses fuzzy logic techniques to combine similarity measures between entities of different ontologies. The proposed approach focuses on two key elements: the terminological similarity, which takes into account the linguistic and semantic information of the context of the entity’s names, and the structural similarity, based on both the internal and relational structure of the concepts. This work has been validated using sensor network ontologies and the Ontology Alignment Evaluation Initiative (OAEI tests. The results show that the proposed techniques outperform previous approaches in terms of precision and recall.

Bernardo Alarcos

2013-09-01

6

Experimenting with an Evolving Ground/Space-based Software Architecture to Enable Sensor Webs  

Science.gov (United States)

A series of ongoing experiments are being conducted at the NASA Goddard Space Flight Center to explore integrated ground and space-based software architectures enabling sensor webs. A sensor web, as defined by Steve Talabac at NASA Goddard Space Flight Center(GSFC), is a coherent set of distributed nodes interconnected by a communications fabric, that collectively behave as a single, dynamically adaptive, observing system. The nodes can be comprised of satellites, ground instruments, computing nodes etc. Sensor web capability requires autonomous management of constellation resources. This becomes progressively more important as more and more satellites share resource, such as communication channels and ground station,s while automatically coordinating their activities. There have been five ongoing activities which include an effort to standardize a set of middleware. This paper will describe one set of activities using the Earth Observing 1 satellite, which used a variety of ground and flight software along with other satellites and ground sensors to prototype a sensor web. This activity allowed us to explore where the difficulties that occur in the assembly of sensor webs given today s technology. We will present an overview of the software system architecture, some key experiments and lessons learned to facilitate better sensor webs in the future.

mandl, Daniel; Frye, Stuart

2005-01-01

7

A Web 2.0 and OGC Standards Enabled Sensor Web Architecture for Global Earth Observing System of Systems  

Science.gov (United States)

This paper will describe the progress of a 3 year research award from the NASA Earth Science Technology Office (ESTO) that began October 1, 2006, in response to a NASA Announcement of Research Opportunity on the topic of sensor webs. The key goal of this research is to prototype an interoperable sensor architecture that will enable interoperability between a heterogeneous set of space-based, Unmanned Aerial System (UAS)-based and ground based sensors. Among the key capabilities being pursued is the ability to automatically discover and task the sensors via the Internet and to automatically discover and assemble the necessary science processing algorithms into workflows in order to transform the sensor data into valuable science products. Our first set of sensor web demonstrations will prototype science products useful in managing wildfires and will use such assets as the Earth Observing 1 spacecraft, managed out of NASA/GSFC, a UASbased instrument, managed out of Ames and some automated ground weather stations, managed by the Forest Service. Also, we are collaborating with some of the other ESTO awardees to expand this demonstration and create synergy between our research efforts. Finally, we are making use of Open Geospatial Consortium (OGC) Sensor Web Enablement (SWE) suite of standards and some Web 2.0 capabilities to Beverage emerging technologies and standards. This research will demonstrate and validate a path for rapid, low cost sensor integration, which is not tied to a particular system, and thus be able to absorb new assets in an easily evolvable, coordinated manner. This in turn will help to facilitate the United States contribution to the Global Earth Observation System of Systems (GEOSS), as agreed by the U.S. and 60 other countries at the third Earth Observation Summit held in February of 2005.

Mandl, Daniel; Unger, Stephen; Ames, Troy; Frye, Stuart; Chien, Steve; Cappelaere, Pat; Tran, Danny; Derezinski, Linda; Paules, Granville

2007-01-01

8

Sensor web  

Science.gov (United States)

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.

Delin, Kevin A. (Inventor); Jackson, Shannon P. (Inventor)

2011-01-01

9

Space-Based Sensor Web for Earth Science Applications: An Integrated Architecture for Providing Societal Benefits  

Science.gov (United States)

There is a significant interest in the Earth Science research and user remote sensing community to substantially increase the number of useful observations relative to the current frequency of collection. The obvious reason for such a push is to improve the temporal, spectral, and spatial coverage of the area(s) under investigation. However, there is little analysis available in terms of the benefits, costs and the optimal set of sensors needed to make the necessary observations. Classic observing system solutions may no longer be applicable because of their point design philosophy. Instead, a new intelligent data collection system paradigm employing both reactive and proactive measurement strategies with adaptability to the dynamics of the phenomena should be developed. This is a complex problem that should be carefully studied and balanced across various boundaries including: science, modeling, applications, and technology. Modeling plays a crucial role in making useful predictions about naturally occurring or human-induced phenomena In particular, modeling can serve to mitigate the potentially deleterious impacts a phenomenon may have on human life, property, and the economy. This is especially significant when one is interested in learning about the dynamics of, for example, the spread of forest fires, regional to large-scale air quality issues, the spread of the harmful invasive species, or the atmospheric transport of volcanic plumes and ash. This paper identifies and examines these challenging issues and presents architectural alternatives for an integrated sensor web to provide observing scenarios driving the requisite dynamic spatial, spectral, and temporal characteristics to address these key application areas. A special emphasis is placed on the observing systems and its operational aspects in serving the multiple users and stakeholders in providing societal benefits. We also address how such systems will take advantage of technological advancement in small spacecraft and emerging information technologies, and how sensor web options may be realized and made affordable. Specialized detector subsystems and precision flying techniques may still require substantial innovation, development time and cost: we have presented the considerations for these issues. Finally, data and information gathering and compression techniques are also briefly described.

Habib, Shahid; Talabac, Stephen J.

2004-01-01

10

GITEWS, an extensible and open integration platform for manifold sensor systems and processing components based on Sensor Web Enablement and the principles of Service Oriented Architectures  

Science.gov (United States)

The German Indonesian Tsunami Early Warning System (GITEWS) is a multifaceted system consisting of various sensor types like seismometers, sea level sensors or GPS stations, and processing components, all with their own system behavior and proprietary data structure. To operate a warning chain, beginning from measurements scaling up to warning products, all components have to interact in a correct way, both syntactically and semantically. Designing the system great emphasis was laid on conformity to the Sensor Web Enablement (SWE) specification by the Open Geospatial Consortium (OGC). The technical infrastructure, the so called Tsunami Service Bus (TSB) follows the blueprint of Service Oriented Architectures (SOA). The TSB is an integration concept (SWE) where functionality (observe, task, notify, alert, and process) is grouped around business processes (Monitoring, Decision Support, Sensor Management) and packaged as interoperable services (SAS, SOS, SPS, WNS). The benefits of using a flexible architecture together with SWE lead to an open integration platform: • accessing and controlling heterogeneous sensors in a uniform way (Functional Integration) • assigns functionality to distinct services (Separation of Concerns) • allows resilient relationship between systems (Loose Coupling) • integrates services so that they can be accessed from everywhere (Location Transparency) • enables infrastructures which integrate heterogeneous applications (Encapsulation) • allows combination of services (Orchestration) and data exchange within business processes Warning systems will evolve over time: New sensor types might be added, old sensors will be replaced and processing components will be improved. From a collection of few basic services it shall be possible to compose more complex functionality essential for specific warning systems. Given these requirements a flexible infrastructure is a prerequisite for sustainable systems and their architecture must be tailored for evolution. The use of well-known techniques and widely used open source software implementing industrial standards reduces the impact of service modifications allowing the evolution of a system as a whole. GITEWS implemented a solution to feed sensor raw data from any (remote) system into the infrastructure. Specific dispatchers enable plugging in sensor-type specific processing without changing the architecture. Client components don't need to be adjusted if new sensor-types or individuals are added to the system, because they access them via standardized services. One of the outstanding features of service-oriented architectures is the possibility to compose new services from existing ones. The so called orchestration, allows the definition of new warning processes which can be adapted easily to new requirements. This approach has following advantages: • With implementing SWE it is possible to establish the "detection" and integration of sensors via the internet. Thus a system of systems combining early warning functionality at different levels of detail is feasible. • Any institution could add both its own components as well as components from third parties if they are developed in conformance to SOA principles. In a federation an institution keeps the ownership of its data and decides which data are provided by a service and when. • A system can be deployed at minor costs as a core for own development at any institution and thus enabling autonomous early warning- or monitoring systems. The presentation covers both design and various instantiations (live demonstration) of the GITEWS architecture. Experiences concerning the design and complexity of SWE will be addressed in detail. A substantial amount of attention is laid on the techniques and methods of extending the architecture, adapting proprietary components to SWE services and encoding, and their orchestration in high level workflows and processes. Furthermore the potential of the architecture concerning adaptive behavior, collaboration across boundaries and semantic interoperab

Haener, Rainer; Waechter, Joachim; Fleischer, Jens; Herrnkind, Stefan; Schwarting, Herrmann

2010-05-01

11

Web Service Architecture Framework for Embedded Devices  

Science.gov (United States)

The use of Service Oriented Architectures, namely web services, has become a widely adopted method for transfer of data between systems across the Internet as well as the Enterprise. Adopting a similar approach to embedded devices is also starting to emerge as personal devices and sensor networks are becoming more common in the industry. This…

Yanzick, Paul David

2009-01-01

12

Sensor Webs in Virtual Globes  

CERN Document Server

A sensor web is a collection of heterogeneous sensors which autonomously reacts to the observed environment. The SouthEast Alaska MOnitoring Network for Science, Telecommunications, Education, and Research (SEAMONSTER) project has implemented a sensor web in partially glaciated watersheds near Juneau, Alaska, on the edge of the Juneau Icefield. By coupling the SEAMONSTER sensor web with digital earth technologies the scientific utility, education and public outreach efforts, and sensor web management of the project all greatly benefit. This paper describes the scientific motivation for a sensor web, the technology developed to implement the sensor web, the software developed to couple the sensor web with digital earth technologies, and demonstrates the SEAMONSTER sensor web in a digital earth framework.

Heavner, M; Hood, E; Connor, C

2009-01-01

13

Open-source Peer-to-Peer Environment to Enable Sensor Web Architecture: Application to Geomagnetic Observations and Modeling  

Science.gov (United States)

A flexible, dynamic, and reliable secure peer-to-peer (P2P) communication environment is under development at NASA's Goddard Space Flight Center (GSFC). Popular open-source P2P software technology provides a self- organizing, self-healing ad hoc "virtual network overlay" protocol-suite. The current effort builds a proof-of-concept geomagnetic Sensor Web upon this foundation. Our long-term objective is to enable an evolution of many types of distributed Earth system sensors and related processing/storage components into elements of an operational Sensor Web via integration into this P2P Environment. In general, the Environment distributes data communication tasks among the sensors (viewed as peers, each assigned a peer-role) and controls the flow of data. This work encompasses dynamic discovery, monitoring, control, and configuration as well as autonomous operations, real-time modeling and data processing, and secure ubiquitous communications. We currently restrict our communications to be within the secure GSFC network environment, and have integrated "simulated" (via historical data) geomagnetic sensors. Each remote sensor has operating modes to manage (from remote interfaces) and is designed to have features nearly indistinguishable from a live magnetometer. We have implemented basic identity management features (organized around GSFC identity-management practices); providing mechanisms which restrict data-serving privileges to authorized users, and which allow improved trust and accountability among users of the Environment. Data-serving peers digitally "sign" their services, and their data-browsing counterparts will only accept the products of services whose signature (and hence identity) can be verified. The current usage scenario involves modeling-peers, which operate within the same Environment as the sensors and also have operating modes to remotely manage, portraying a near-real- time global representation of geomagnetic activity from dynamic sensor-reported values. Remote "browsing" peers access these modeling-run results within the Environment, but also have the option to access the sensors directly. We expect that this preparatory work will benefit the LWS/Geospace program, as real-time geomagnetic observations are relevant to Sun-Earth Connection studies.

Holland, M.; Pulkkinen, A.

2007-12-01

14

Sensor system for web inspection  

Science.gov (United States)

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.

Sleefe, Gerard E. (1 Snowcap Ct., Cedar Crest, NM 87008); Rudnick, Thomas J. (626 E. Jackson Rd., St. Louis, MO 63119); Novak, James L. (11048 Malaguena La. NE., Albuquerque, NM 87111)

2002-01-01

15

Adaptive reconfigurable distributed sensor architecture  

Science.gov (United States)

The infancy of unattended ground based sensors is quickly coming to an end with the arrival of on-board GPS, networking, and multiple sensing capabilities. Unfortunately, their use is only first-order at best: GPS assists with sensor report registration; networks push sensor reports back to the warfighter and forwards control information to the sensors; multispectral sensing is a preset, pre-deployment consideration; and the scalability of large sensor networks is questionable. Current architectures provide little synergy among or within the sensors either before or after deployment, and do not map well to the tactical user's organizational structures and constraints. A new distributed sensor architecture is defined which moves well beyond single sensor, single task architectures. Advantages include: (1) automatic mapping of tactical direction to multiple sensors' tasks; (2) decentralized, distributed management of sensor resources and tasks; (3) software reconfiguration of deployed sensors; (4) network scalability and flexibility to meet the constraints of tactical deployments, and traditional combat organizations and hierarchies; and (5) adaptability to new battlefield communication paradigms such as BADD (Battlefield Analysis and Data Dissemination). The architecture is supported in two areas: a recursive, structural definition of resource configuration and management via loose associations; and a hybridization of intelligent software agents with tele- programming capabilities. The distributed sensor architecture is examined within the context of air-deployed ground sensors with acoustic, communication direction finding, and infra-red capabilities. Advantages and disadvantages of the architecture are examined. Consideration is given to extended sensor life (up to 6 months), post-deployment sensor reconfiguration, limited on- board sensor resources (processor and memory), and bandwidth. It is shown that technical tasking of the sensor suite can be automatically accomplished via the warfighter's tactical direction enabling the DoD's vision of a `single logical taskable entity'.

Akey, Mark L.

1997-07-01

16

Sensor Web Enablement for Coastal Buoy Systems  

Science.gov (United States)

Coastal buoys and stations provide frequent, high-quality marine observations for weather service, public safety, atmospheric, and oceanographic study. However, sharing of the generated datasets, information, and results, between geographically distributed organizations often proves to be challenging. This is due to the complicated steps involved in data discovery and conversion of the data into usable information due to problems of syntactic, structural, and semantic heterogeneity in the datasets. Therefore, a standardized modeling framework is desired for the coastal buoys to provide enhanced capabilities for interoperability and to better disseminate the information. This study is developing an interoperable framework for coastal buoys using Sensor Model Language (SensorML) and other components (e.g., Observations & Measurements Schema (O&M), Transducer Markup Language (TransducerML), Sensor Observation Service (SOS), etc) of the OpenGeospatial Consortium (OGC) Sensor Web Enablement (SWE). SensorML is a standard for the description of measurement devices and more complex measurement systems, in order to enable automatic processing of sensor data by generic software. In this study, buoys operated by the National Data Buoy Center (NDBC) with different payloads (e.g., ARES, DACT, DART, GSBP, MARS, and VEEP) were described using SensorML. Each of these payloads has a variety of sensors used to measure the marine parameters (e.g., sea surface temperature, wind direction, wind speed, water level). Our framework of the proposed Coastal Sensor Web Enablement (CSWE) middleware for buoy systems is built upon the existing OGC web services. The Web service specifications such as Sensor Planning Service (SPS), Sensor Observation Service (SOS), and Sensor Alert Service (SAS) define how data collection requests are expressed, observations retrieved, and alert or alarm conditions defined. The integration of these components in the proposed architecture provides access to observations from sensors and sensor systems in a standard way that is consistent for all sensor systems including remote, in-situ, fixed and mobile sensors.

Ling, Y.; Durbha, S. S.; King, R. L.

2006-12-01

17

GeoCENS: a geospatial cyberinfrastructure for the world-wide sensor web.  

Science.gov (United States)

The world-wide sensor web has become a very useful technique for monitoring the physical world at spatial and temporal scales that were previously impossible. Yet we believe that the full potential of sensor web has thus far not been revealed. In order to harvest the world-wide sensor web's full potential, a geospatial cyberinfrastructure is needed to store, process, and deliver large amount of sensor data collected worldwide. In this paper, we first define the issue of the sensor web long tail followed by our view of the world-wide sensor web architecture. Then, we introduce the Geospatial Cyberinfrastructure for Environmental Sensing (GeoCENS) architecture and explain each of its components. Finally, with demonstration of three real-world powered-by-GeoCENS sensor web applications, we believe that the GeoCENS architecture can successfully address the sensor web long tail issue and consequently realize the world-wide sensor web vision. PMID:24152921

Liang, Steve H L; Huang, Chih-Yuan

2013-01-01

18

Autonomous Mission Operations for Sensor Webs  

Science.gov (United States)

We present interim results of a 2005 ROSES AIST project entitled, "Using Intelligent Agents to Form a Sensor Web for Autonomous Mission Operations", or SWAMO. The goal of the SWAMO project is to shift the control of spacecraft missions from a ground-based, centrally controlled architecture to a collaborative, distributed set of intelligent agents. The network of intelligent agents intends to reduce management requirements by utilizing model-based system prediction and autonomic model/agent collaboration. SWAMO agents are distributed throughout the Sensor Web environment, which may include multiple spacecraft, aircraft, ground systems, and ocean systems, as well as manned operations centers. The agents monitor and manage sensor platforms, Earth sensing systems, and Earth sensing models and processes. The SWAMO agents form a Sensor Web of agents via peer-to-peer coordination. Some of the intelligent agents are mobile and able to traverse between on-orbit and ground-based systems. Other agents in the network are responsible for encapsulating system models to perform prediction of future behavior of the modeled subsystems and components to which they are assigned. The software agents use semantic web technologies to enable improved information sharing among the operational entities of the Sensor Web. The semantics include ontological conceptualizations of the Sensor Web environment, plus conceptualizations of the SWAMO agents themselves. By conceptualizations of the agents, we mean knowledge of their state, operational capabilities, current operational capacities, Web Service search and discovery results, agent collaboration rules, etc. The need for ontological conceptualizations over the agents is to enable autonomous and autonomic operations of the Sensor Web. The SWAMO ontology enables automated decision making and responses to the dynamic Sensor Web environment and to end user science requests. The current ontology is compatible with Open Geospatial Consortium (OGC) Sensor Web Enablement (SWE) Sensor Model Language (SensorML) concepts and structures. The agents are currently deployed on the U.S. Naval Academy MidSTAR-1 satellite and are actively managing the power subsystem on-orbit without the need for human intervention.

Underbrink, A.; Witt, K.; Stanley, J.; Mandl, D.

2008-12-01

19

WebTag: Web Browsing into Sensor Tags over NFC  

Directory of Open Access Journals (Sweden)

Full Text Available Information and Communication Technologies (ICTs continue to overcome many of the challenges related to wireless sensor monitoring, such as for example the design of smarter embedded processors, the improvement of the network architectures, the development of efficient communication protocols or the maximization of the life cycle autonomy. This work tries to improve the communication link of the data transmission in wireless sensor monitoring. The upstream communication link is usually based on standard IP technologies, but the downstream side is always masked with the proprietary protocols used for the wireless link (like ZigBee, Bluetooth, RFID, etc.. This work presents a novel solution (WebTag for a direct IP based access to a sensor tag over the Near Field Communication (NFC technology for secure applications. WebTag allows a direct web access to the sensor tag by means of a standard web browser, it reads the sensor data, configures the sampling rate and implements IP based security policies. It is, definitely, a new step towards the evolution of the Internet of Things paradigm.

Juan Jose Echevarria

2012-06-01

20

WebTag: Web browsing into sensor tags over NFC.  

Science.gov (United States)

Information and Communication Technologies (ICTs) continue to overcome many of the challenges related to wireless sensor monitoring, such as for example the design of smarter embedded processors, the improvement of the network architectures, the development of efficient communication protocols or the maximization of the life cycle autonomy. This work tries to improve the communication link of the data transmission in wireless sensor monitoring. The upstream communication link is usually based on standard IP technologies, but the downstream side is always masked with the proprietary protocols used for the wireless link (like ZigBee, Bluetooth, RFID, etc.). This work presents a novel solution (WebTag) for a direct IP based access to a sensor tag over the Near Field Communication (NFC) technology for secure applications. WebTag allows a direct web access to the sensor tag by means of a standard web browser, it reads the sensor data, configures the sampling rate and implements IP based security policies. It is, definitely, a new step towards the evolution of the Internet of Things paradigm. PMID:23012511

Echevarria, Juan Jose; Ruiz-de-Garibay, Jonathan; Legarda, Jon; Alvarez, Maite; Ayerbe, Ana; Vazquez, Juan Ignacio

2012-01-01

 
 
 
 
21

Multi-Sensor Architectures  

DEFF Research Database (Denmark)

The use of multiple sensors typically requires the fusion of data from different type of sensors. The combined use of such a data has the potential to give an efficient, high quality and reliable estimation. Input data from different sensors allows the introduction of target attributes (target type, size) into the association logic. This requires a more general association logic, in which both the physical position parameters and the target attributes can be used simultaneously. Although, the data fusion from a number of sensors could provide better and reliable estimation but abundance of information is to be handled. Therefore, more extensive computer resources are needed for such a system. The parallel processing technique could be an alternative for such a system. The main objective of this research is to provide a real time task allocation strategy for data processing using multiple processing units for same type of multiple sensors, typically radar in our case.

Hussain, Dil Muhammad Akbar; Ahmed, Zaki

2012-01-01

22

Architectural patterns regarding web application domain usability  

Directory of Open Access Journals (Sweden)

Full Text Available Usability is one of the quality characteristics having the greatest impact on final user acceptation in a web application context. However, the relationship between usability and software architecture has not been completely identified and characterised. Some work has found some relationships between usability and architecture but not between architectural patterns. This paper’s main contribution lies in its identification of architecture patterns and how they have influenced usability within the context of web applications. This study is useful for architects and new product designers regarding the early identification of possible problems and/or advantages (at architectural level, using some of them in a web application. Additionally, architects could identify weak- nesses in initial designs thereby increasing final user satisfaction. The study could be useful when a web application is being eva- luated, since detecting possible usability problems or weaknesses implies that it should be improved. Consequently, some chan- ges would be made to the application, both in its interfaces and at architectural level. In this case, the problem can be related and the most suitable solution be suggested in terms of patterns. The impact of this work’s architectural pattern has been vali- dated on two Colombian small- and medium-sized enterprises which have exercised some of the proposed patterns and verified their influence on usability properties.

José Luis Arciniegas Herrera

2010-05-01

23

A Semantic Sensor Web for Environmental Decision Support Applications  

Directory of Open Access Journals (Sweden)

Full Text Available Sensing devices are increasingly being deployed to monitor the physical world around us. One class of application for which sensor data is pertinent is environmental decision support systems, e.g., flood emergency response. For these applications, the sensor readings need to be put in context by integrating them with other sources of data about the surrounding environment. Traditional systems for predicting and detecting floods rely on methods that need significant human resources. In this paper we describe a semantic sensor web architecture for integrating multiple heterogeneous datasets, including live and historic sensor data, databases, and map layers. The architecture provides mechanisms for discovering datasets, defining integrated views over them, continuously receiving data in real-time, and visualising on screen and interacting with the data. Our approach makes extensive use of web service standards for querying and accessing data, and semantic technologies to discover and integrate datasets. We demonstrate the use of our semantic sensor web architecture in the context of a flood response planning web application that uses data from sensor networks monitoring the sea-state around the coast of England.

Raúl García-Castro

2011-09-01

24

Semantic Architecture for Web application Security  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Growth of web applications has facilitated the humanity almost in all aspects of life especially e-health, e-business and e-communication but this application are exposed for web attacks, unauthorized access, evil intentions and treacherous engagements. Various strategies have been formulated over a period of time in the form of intrusion detection system, encryption devices, and firewalls but still proved to be ineffective. In this paper, we have proposed a system having semantic architectur...

Abdul Razzaq; Ali Hur; Farooq Ahmad, H.; Muddassar Masood

2012-01-01

25

SPIM Architecture for MVC based Web Applications  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The Model / View / Controller design pattern divides an application environment into three components to handle the user-interactions, computations and output respectively. This separation greatly favors architectural reusability. The pattern works well in the case of single-address space and not proven to be efficient for web applications involving multiple address spaces. Web applications force the designers to decide which of the components of the pattern are to be partit...

Sridaran, R.; Padmavathi, G.; Iyakutti, K.; Mani, M. N. S.

2010-01-01

26

Discovery Mechanisms for the Sensor Web  

Directory of Open Access Journals (Sweden)

Full Text Available This paper addresses the discovery of sensors within the OGC Sensor Web Enablement framework. Whereas services like the OGC Web Map Service or Web Coverage Service are already well supported through catalogue services, the field of sensor networks and the according discovery mechanisms is still a challenge. The focus within this article will be on the use of existing OGC Sensor Web components for realizing a discovery solution. After discussing the requirements for a Sensor Web discovery mechanism, an approach will be presented that was developed within the EU funded project “OSIRIS”. This solution offers mechanisms to search for sensors, exploit basic semantic relationships, harvest sensor metadata and integrate sensor discovery into already existing catalogues.

Christoph Stasch

2009-04-01

27

SPIM Architecture for MVC based Web Applications  

CERN Document Server

The Model / View / Controller design pattern divides an application environment into three components to handle the user-interactions, computations and output respectively. This separation greatly favors architectural reusability. The pattern works well in the case of single-address space and not proven to be efficient for web applications involving multiple address spaces. Web applications force the designers to decide which of the components of the pattern are to be partitioned between the server and client(s) before the design phase commences. For any rapidly growing web application, it is very difficult to incorporate future changes in policies related to partitioning. One solution to this problem is to duplicate the Model and controller components at both server and client(s). However, this may add further problems like delayed data fetch, security and scalability issues. In order to overcome this, a new architecture SPIM has been proposed that deals with the partitioning problem in an alternative way. S...

Sridaran, R; Iyakutti, K; Mani, M N S

2010-01-01

28

Hybrid architecture for building secure sensor networks  

Science.gov (United States)

Sensor networks have various communication and security architectural concerns. Three approaches are defined to address these concerns for sensor networks. The first area is the utilization of new computing architectures that leverage embedded virtualization software on the sensor. Deploying a small, embedded virtualization operating system on the sensor nodes that is designed to communicate to low-cost cloud computing infrastructure in the network is the foundation to delivering low-cost, secure sensor networks. The second area focuses on securing the sensor. Sensor security components include developing an identification scheme, and leveraging authentication algorithms and protocols that address security assurance within the physical, communication network, and application layers. This function will primarily be accomplished through encrypting the communication channel and integrating sensor network firewall and intrusion detection/prevention components to the sensor network architecture. Hence, sensor networks will be able to maintain high levels of security. The third area addresses the real-time and high priority nature of the data that sensor networks collect. This function requires that a quality-of-service (QoS) definition and algorithm be developed for delivering the right data at the right time. A hybrid architecture is proposed that combines software and hardware features to handle network traffic with diverse QoS requirements.

Owens, Ken R., Jr.; Watkins, Steve E.

2012-04-01

29

SSWAP: A Simple Semantic Web Architecture and Protocol for semantic web services  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Abstract Background SSWAP (Simple Semantic Web Architecture and Protocol; pronounced "swap") is an architecture, protocol, and platform for using reasoning to semantically integrate heterogeneous disparate data and services on the web. SSWAP was developed as a hybrid semantic web services technology to overcome limitations found in both pure web service technologies and pure semantic web technologies. Results There are currentl...

Town Christopher D; Avraham Shulamit; May Greg D; Schiltz Gary S; Dg, Gessler Damian; Grant David; Nelson Rex T

2009-01-01

30

Hybrid sensor fusion algorithm architecture and tracklets  

Science.gov (United States)

For track maintenance, there are primarily three generic sensor data fusion algorithm architectures, namely, central fusion, track fusion, and what will be referred to as composite measurement fusion. In central fusion, the sensor measurements are distributed by each sensor and the measurements from multiple sensors are then used to update the global tracks. Measurements are also called: returns, observations, threshold exceedances, plots, contacts, or hits depending on the sensors involved. In contrast, in track fusion a sequence of measurements is processed at the sensor or platform level to form tracks that are then distributed and this track data is then used to update the global tracks. Track fusion is also sometimes called hierarchical fusion, federated fusion or distributed fusion. Finally, in composite measurement fusion the measurements from multiple sensors for each apparent target are first combined to form a composite measurement and then the composite measurements are then used to update the global tracks. The tracks typically include features or other target classification information. Each of these algorithm architectures has their own advantages and disadvantages. For example, track fusion may lead to substantially reduced communications load and that can be important for physically distributed platforms. Track fusion also tends to be less sensitive to residual sensor bias errors. Central fusion typically provides more timely information. Also, for certain types of target scenarios and sensor suites, central fusion provides better accuracy in both estimation and target classification. Recent developments in track fusion make a particular hybrid fusion algorithm architecture not only appealing but practical. In this hybrid fusion, either measurement or track data in the form of a tracklet is distributed from a sensor for a target. This approach offers many of the advantages of both the centralized and track fusion algorithm architectures. This paper describes a specific hybrid fusion algorithm architecture, the decision logic for distributing measurement or track data, and the recent track fusion innovations that make this hybrid fusion practical.

Drummond, Oliver E.

1997-10-01

31

A Ubiquitous Sensor Network Platform for Integrating Smart Devices into the Semantic Sensor Web  

Science.gov (United States)

Ongoing Sensor Web developments make a growing amount of heterogeneous sensor data available to smart devices. This is generating an increasing demand for homogeneous mechanisms to access, publish and share real-world information. This paper discusses, first, an architectural solution based on Next Generation Networks: a pilot Telco Ubiquitous Sensor Network (USN) Platform that embeds several OGC® Sensor Web services. This platform has already been deployed in large scale projects. Second, the USN-Platform is extended to explore a first approach to Semantic Sensor Web principles and technologies, so that smart devices can access Sensor Web data, allowing them also to share richer (semantically interpreted) information. An experimental scenario is presented: a smart car that consumes and produces real-world information which is integrated into the Semantic Sensor Web through a Telco USN-Platform. Performance tests revealed that observation publishing times with our experimental system were well within limits compatible with the adequate operation of smart safety assistance systems in vehicles. On the other hand, response times for complex queries on large repositories may be inappropriate for rapid reaction needs. PMID:24945678

de Vera, David Diaz Pardo; Izquierdo, Alvaro Siguenza; Vercher, Jesus Bernat; Gomez, Luis Alfonso Hernandez

2014-01-01

32

A Ubiquitous Sensor Network Platform for Integrating Smart Devices into the Semantic Sensor Web  

Directory of Open Access Journals (Sweden)

Full Text Available Ongoing Sensor Web developments make a growing amount of heterogeneous sensor data available to smart devices. This is generating an increasing demand for homogeneous mechanisms to access, publish and share real-world information. This paper discusses, first, an architectural solution based on Next Generation Networks: a pilot Telco Ubiquitous Sensor Network (USN Platform that embeds several OGC® Sensor Web services. This platform has already been deployed in large scale projects. Second, the USN-Platform is extended to explore a first approach to Semantic Sensor Web principles and technologies, so that smart devices can access Sensor Web data, allowing them also to share richer (semantically interpreted information. An experimental scenario is presented: a smart car that consumes and produces real-world information which is integrated into the Semantic Sensor Web through a Telco USN-Platform. Performance tests revealed that observation publishing times with our experimental system were well within limits compatible with the adequate operation of smart safety assistance systems in vehicles. On the other hand, response times for complex queries on large repositories may be inappropriate for rapid reaction needs.

David Díaz Pardo de Vera

2014-06-01

33

Component Architectures and Web-Based Learning Environments  

Science.gov (United States)

The Web has caught the attention of many educators as an efficient communication medium and content delivery system. But we feel there is another aspect of the Web that has not been given the attention it deserves. We call this aspect of the Web its "component architecture." Briefly it means that on the Web one can develop very complex…

Ferdig, Richard E.; Mishra, Punya; Zhao, Yong

2004-01-01

34

Semantic Architecture for Web application Security  

Directory of Open Access Journals (Sweden)

Full Text Available Growth of web applications has facilitated the humanity almost in all aspects of life especially e-health, e-business and e-communication but this application are exposed for web attacks, unauthorized access, evil intentions and treacherous engagements. Various strategies have been formulated over a period of time in the form of intrusion detection system, encryption devices, and firewalls but still proved to be ineffective. In this paper, we have proposed a system having semantic architecture that is capable of performing detection semantically in the context of HTTP protocol, the data, and the target application. The knowledgebase of the system is the ontological representation of communication protocol, attacks data and the application profile that can be refined and expanded over time. Unlike traditional signature base approach, the semantic architecture analysis the HTTP request with the help of semantic rules and inferred knowledge after reasoning of knowledgebase through Inference engine. Non signature based approach of the system enhance the capability of the system to detect the unknown attacks with low false positive rate. The system is evaluated by comparing with existing open source solutions and showing significant improvement in term of detection ability with low alarm rate

Abdul Razzaq

2012-03-01

35

UTILIZATION OF WEB SERVICES FOR SERVICE ORIENTED ARCHITECTURE  

Directory of Open Access Journals (Sweden)

Full Text Available Rapid evolution of software architectures has become nowadays trend, in which distributed processing has proven highly efficient. Multiple architectures for distributed processing are available based on object oriented and component oriented concepts having their own advantages and limitations. The main aspect of developing the consistent architectural framework is to reduce the development cost of IT solutions and to integrate the business partners and customers with various capabilities with a clear vision in a easily manageable, quick and reusable fashion. Service Oriented Architecture is architecture, which is independent from any certain technology. The opening section of the paper highlights limitations of current software architectures as well as it focuses on need of Service Oriented Architecture by emphasizing various architectural aspects including role of service. The second section presents the characteristics of Web Services with their advantages. It also shows that how Web Services fulfill the requirement of frequently changing needs of business industries by implementing Service Oriented Architecture. The last section of the paper presents the application of Web Services in implementing Service Oriented Architecture. A prototype example of Web Service is developed to show the efficiency of the proposed approach. Keywords: Service Oriented Architecture, Service, Web Service, and WSDL.

Kunjal B. Mankad

2010-09-01

36

WebTag: Web Browsing into Sensor Tags over NFC  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Information and Communication Technologies (ICTs) continue to overcome many of the challenges related to wireless sensor monitoring, such as for example the design of smarter embedded processors, the improvement of the network architectures, the development of efficient communication protocols or the maximization of the life cycle autonomy. This work tries to improve the communication link of the data transmission in wireless sensor monitoring. The upstream communication link is usually based...

Juan Jose Echevarria; Jonathan Ruiz-de-Garibay; Jon Legarda; Maite Álvarez; Ana Ayerbe; Juan Ignacio Vazquez

2012-01-01

37

The OGC Sensor Web Enablement framework  

Science.gov (United States)

Sensor observations are at the core of natural sciences. Improvements in data-sharing technologies offer the promise of much greater utilisation of observational data. A key to this is interoperable data standards. The Open Geospatial Consortium's (OGC) Sensor Web Enablement initiative (SWE) is developing open standards for web interfaces for the discovery, exchange and processing of sensor observations, and tasking of sensor systems. The goal is to support the construction of complex sensor applications through real-time composition of service chains from standard components. The framework is based around a suite of standard interfaces, and standard encodings for the message transferred between services. The SWE interfaces include: Sensor Observation Service (SOS)-parameterized observation requests (by observation time, feature of interest, property, sensor); Sensor Planning Service (SPS)-tasking a sensor- system to undertake future observations; Sensor Alert Service (SAS)-subscription to an alert, usually triggered by a sensor result exceeding some value. The interface design generally follows the pattern established in the OGC Web Map Service (WMS) and Web Feature Service (WFS) interfaces, where the interaction between a client and service follows a standard sequence of requests and responses. The first obtains a general description of the service capabilities, followed by obtaining detail required to formulate a data request, and finally a request for a data instance or stream. These may be implemented in a stateless "REST" idiom, or using conventional "web-services" (SOAP) messaging. In a deployed system, the SWE interfaces are supplemented by Catalogue, data (WFS) and portrayal (WMS) services, as well as authentication and rights management. The standard SWE data formats are Observations and Measurements (O&M) which encodes observation metadata and results, Sensor Model Language (SensorML) which describes sensor-systems, Transducer Model Language (TML) which covers low-level data streams, and domain-specific GML Application Schemas for definitions of the target feature types. The SWE framework has been demonstrated in several interoperability testbeds. These were based around emergency management, security, contamination and environmental monitoring scenarios.

Cox, S. J.; Botts, M.

2006-12-01

38

Integrated Web Architecture Based on Web3D, Flex and SSH  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Focusing on the problems occurred in traditional 2D image-word-based web applications, the author put forward con-cept of integrating Web3D, Flex and SSH technologies to create advanced “3D Virtual Reality & RIA” web application architecture, researched mechanisms of their architectures, and implemented their integration and communication & interaction: Flex and Struts2 via XML, Flex and Spring & Hibernate via BlazeDS, Flex and Web3D via JavaScript. The practice has shown that...

Zhang, Wenjun

2010-01-01

39

Visual Architecture based Web Information Extraction  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The World Wide Web has more online web database which can be searched through their web query interface. Deep Web contents are accessed by queries submitted to Web databases and the returned data records are enwrapped in dynamically generated Web pages. Extracting structured data from deep Web pages is a challenging task due to the underlying complicate structures of such pages. Until now, a large number of techniques have been proposed to address this problem, but all of them have inherent l...

Oswalt Manoj, S.

2011-01-01

40

Semantic Web on Scope: A New Architectural Model for the Semantic Web  

Directory of Open Access Journals (Sweden)

Full Text Available Problem Statement: Current web contains billions of documents and has many administrative problems and limitations; in addition to that the web content is still accessible only to humans. The solution to these problems is the Semantic Web. The Semantic Web is considered to be the extension for the current web. But there are problems facing the Semantic Web now, such as there is no clear architecture for it, there are four versions created by Tim Berners-Lee, but still up to now there is no agreement for one of these visions nor is there a clear picture for the relation between different layers inside this architecture and the associated technologies. The objectives of this study were to: (i Identify the weaknesses that existed in the previous architectures and (ii Reach a new architecture that corrects these weaknesses. Approach: This research uses the Qualitative Analysis Approach of Taylor and Renner, presents the four versions of the Semantic Web architecture, describing the function(s and status of each layer and associated technologies, evaluates them using Gerber evaluation method and determines other design principles needed to modify and adapt this architecture as a step toward an agreement for one Semantic Web architecture. Results: The design of a new model for the Semantic Web architecture depends on the idea of previous versions. Conclusion: As a step toward a unified architecture for the Semantic Web, our study of the Semantic Web architecture highlighted some weaknesses that existed in the previous architectures, modify, adapt and reach a new architecture that corrects these weaknesses.

Haytham T. Al-Feel

2008-01-01

 
 
 
 
41

Wireless Sensor Network Architectures for Different Systems  

Directory of Open Access Journals (Sweden)

Full Text Available Recent technological advances enabled the design andproliferation of wireless sensor networks capable ofautonomously monitoring and controlling environments. Oneof the most promising applications of sensor networks is forhuman health monitoring. The wireless body area networkspromise to revolutionize health monitoring. Within a smartbuilding many sensors and actuators are interconnected to forma control system. Here a web services-based approach tointegrate resource constrained sensor and actuator nodes intoIP-based networks. A key feature of this approach is itscapability for automatic service discovery. IntelligentVehicular Systems (IVSs emerged as a potential candidate forbenefiting from the unique features and capabilities of WSNs.In IVSs, transportation infrastructure is supported with theingenious achievements of computer and informationtechnology to resolve severe situations like traffic congestionand cope with emergency conditions like major accidents.

Sanjeev Narayan Bal

2012-08-01

42

DESIGNING DEPENDABLE AGILE LAYERED WEB SERVICES SECURITY ARCHITECTURE SOLUTIONS  

Directory of Open Access Journals (Sweden)

Full Text Available Service Orientation Engineering (SOE (using Web Services and Agile modeling software development presents promising solutions for contemporary software development projects to deal effectively withchallenges in increasingly turbulent business environments typified by unpredictable markets, changing customer requirements, pressures of even shorter time to deliver, and rapidly advancing informationtechnologies. Web Services Security Architectures have three layers, as provided by NIST standard: Web Service Layer, Web Services Framework Layer (.NET or J2EE, and Web Server Layer. In services oriented web services architecture, business processes are executed as a composition of services, which can suffer from vulnerabilities pertaining to secure data access and protecting code of Web Services. The goal of the Web services security architecture is to summary out the details of message-level security from the mainstream business logic, with a focus on Web Service contract design and versioning for SOA. Service oriented web services architectures impose additional analysis complexity as they provide much flexibility and frequentchanges with in orchestrated processes and services. In this paper, we discuss about developing dependable solutions for Web Services Security Architectures using Agile Layered security architectures in terms of Privacy requirements. All this research is motivated by Secure Service Oriented Analysis and Design research domain. We initially validate this by a BPEL Editor using GWT for RBAC and Privacy. Finally a real world case study is implemented using J2EE, for validating our approach. Secure Stock Exchange System using Web Services is to automate the stock exchange works, and can help user make the decisions when it comes to investment.

M.UPENDRA KUMAR

2011-06-01

43

WebSpy: An Architecture for Monitoring Web Server Availability in a Multi-Platform Environment  

Directory of Open Access Journals (Sweden)

Full Text Available For an electronic business (e-business, customer satisfaction can be the difference between long-term success and short-term failure. Customer satisfaction is highly impacted by Web server availability, as customers expect a Web site to be available twenty-four hours a day and seven days a week. Unfortunately, unscheduled Web server downtime is often beyond the control of the organization. What is needed is an effective means of identifying and recovering from Web server downtime in order to minimize the negative impact on the customer. An automated architecture, called WebSpy, has been developed to notify administration and to take immediate action when Web server downtime is detected. This paper describes the WebSpy architecture and differentiates it from other popular Web monitoring tools. The results of a case study are presented as a means of demonstrating WebSpy's effectiveness in monitoring Web server availability.

Madhan Mohan Thirukonda

2002-01-01

44

Evolving EO-1 Sensor Web Testbed Capabilities in Pursuit of GEOSS  

Science.gov (United States)

A viewgraph presentation to evolve sensor web capabilities in pursuit of capabilities to support Global Earth Observing System of Systems (GEOSS) is shown. The topics include: 1) Vision to Enable Sensor Webs with "Hot Spots"; 2) Vision Extended for Communication/Control Architecture for Missions to Mars; 3) Key Capabilities Implemented to Enable EO-1 Sensor Webs; 4) One of Three Experiments Conducted by UMBC Undergraduate Class 12-14-05 (1 - 3); 5) Closer Look at our Mini-Rovers and Simulated Mars Landscae at GSFC; 6) Beginning to Implement Experiments with Standards-Vision for Integrated Sensor Web Environment; 7) Goddard Mission Services Evolution Center (GMSEC); 8) GMSEC Component Catalog; 9) Core Flight System (CFS) and Extension for GMSEC for Flight SW; 10) Sensor Modeling Language; 11) Seamless Ground to Space Integrated Message Bus Demonstration (completed December 2005); 12) Other Experiments in Queue; 13) Acknowledgements; and 14) References.

Mandi, Dan; Ly, Vuong; Frye, Stuart; Younis, Mohamed

2006-01-01

45

Visual Architecture based Web Information Extraction  

Directory of Open Access Journals (Sweden)

Full Text Available The World Wide Web has more online web database which can be searched through their web query interface. Deep Web contents are accessed by queries submitted to Web databases and the returned data records are enwrapped in dynamically generated Web pages. Extracting structured data from deep Web pages is a challenging task due to the underlying complicate structures of such pages. Until now, a large number of techniques have been proposed to address this problem, but all of them have inherent limitations because they are Web-page-programming-language dependent. As the popular two-dimensional media, the contents on Web pages are always displayed regularly for users to browse. This motivates us to seek a different way for deep Web data extraction to overcome the limitations of previous works by utilizing some interesting common visual features on the deep Web pages. In this paper, a novel vision-based approach that is Web-page programming- language-independent is proposed. This approach primarily utilizes the visual features on the deep Web pages to implement deep Web data extraction, including data record extraction and data item extraction.

S. Oswalt Manoj

2011-12-01

46

Sharing human-generated observations by integrating HMI and the Semantic Sensor Web.  

Science.gov (United States)

Current "Internet of Things" concepts point to a future where connected objects gather meaningful information about their environment and share it with other objects and people. In particular, objects embedding Human Machine Interaction (HMI), such as mobile devices and, increasingly, connected vehicles, home appliances, urban interactive infrastructures, etc., may not only be conceived as sources of sensor information, but, through interaction with their users, they can also produce highly valuable context-aware human-generated observations. We believe that the great promise offered by combining and sharing all of the different sources of information available can be realized through the integration of HMI and Semantic Sensor Web technologies. This paper presents a technological framework that harmonizes two of the most influential HMI and Sensor Web initiatives: the W3C's Multimodal Architecture and Interfaces (MMI) and the Open Geospatial Consortium (OGC) Sensor Web Enablement (SWE) with its semantic extension, respectively. Although the proposed framework is general enough to be applied in a variety of connected objects integrating HMI, a particular development is presented for a connected car scenario where drivers' observations about the traffic or their environment are shared across the Semantic Sensor Web. For implementation and evaluation purposes an on-board OSGi (Open Services Gateway Initiative) architecture was built, integrating several available HMI, Sensor Web and Semantic Web technologies. A technical performance test and a conceptual validation of the scenario with potential users are reported, with results suggesting the approach is sound. PMID:22778643

Sigüenza, Alvaro; Díaz-Pardo, David; Bernat, Jesús; Vancea, Vasile; Blanco, José Luis; Conejero, David; Gómez, Luis Hernández

2012-01-01

47

Sharing Human-Generated Observations by Integrating HMI and the Semantic Sensor Web  

Directory of Open Access Journals (Sweden)

Full Text Available Current “Internet of Things” concepts point to a future where connected objects gather meaningful information about their environment and share it with other objects and people. In particular, objects embedding Human Machine Interaction (HMI, such as mobile devices and, increasingly, connected vehicles, home appliances, urban interactive infrastructures, etc., may not only be conceived as sources of sensor information, but, through interaction with their users, they can also produce highly valuable context-aware human-generated observations. We believe that the great promise offered by combining and sharing all of the different sources of information available can be realized through the integration of HMI and Semantic Sensor Web technologies. This paper presents a technological framework that harmonizes two of the most influential HMI and Sensor Web initiatives: the W3C’s Multimodal Architecture and Interfaces (MMI and the Open Geospatial Consortium (OGC Sensor Web Enablement (SWE with its semantic extension, respectively. Although the proposed framework is general enough to be applied in a variety of connected objects integrating HMI, a particular development is presented for a connected car scenario where drivers’ observations about the traffic or their environment are shared across the Semantic Sensor Web. For implementation and evaluation purposes an on-board OSGi (Open Services Gateway Initiative architecture was built, integrating several available HMI, Sensor Web and Semantic Web technologies. A technical performance test and a conceptual validation of the scenario with potential users are reported, with results suggesting the approach is sound.

David Conejero

2012-05-01

48

An Open Distributed Architecture for Sensor Networks for Risk Management  

Directory of Open Access Journals (Sweden)

Full Text Available Sensors provide some of the basic input data for risk management of natural andman-made hazards. Here the word ‘sensors’ covers everything from remote sensingsatellites, providing invaluable images of large regions, through instruments installed on theEarth’s surface to instruments situated in deep boreholes and on the sea floor, providinghighly-detailed point-based information from single sites. Data from such sensors is used inall stages of risk management, from hazard, vulnerability and risk assessment in the preeventphase, information to provide on-site help during the crisis phase through to data toaid in recovery following an event. Because data from sensors play such an important part inimproving understanding of the causes of risk and consequently in its mitigation,considerable investment has been made in the construction and maintenance of highlysophisticatedsensor networks. In spite of the ubiquitous need for information from sensornetworks, the use of such data is hampered in many ways. Firstly, information about thepresence and capabilities of sensor networks operating in a region is difficult to obtain dueto a lack of easily available and usable meta-information. Secondly, once sensor networkshave been identified their data it is often difficult to access due to a lack of interoperability between dissemination and acquisition systems. Thirdly, the transfer and processing ofinformation from sensors is limited, again by incompatibilities between systems. Therefore,the current situation leads to a lack of efficiency and limited use of the available data thathas an important role to play in risk mitigation. In view of this situation, the EuropeanCommission (EC is funding a number of Integrated Projects within the Sixth FrameworkProgramme concerned with improving the accessibility of data and services for riskmanagement. Two of these projects: ‘Open Architecture and Spatial Data Infrastructure forRisk Management’ (ORCHESTRA, http://www.eu-orchestra.org/ and ‘Sensors Anywhere’(SANY, http://sany-ip.eu/ are discussed in this article. These projects have developed anopen distributed information technology architecture and have implemented web servicesfor the accessing and using data emanating, for example, from sensor networks. Thesedevelopments are based on existing data and service standards proposed by internationalorganizations. The projects seek to develop the ideals of the EC directive INSPIRE(http://inspire.jrc.it, which was launched in 2001 and whose implementation began this year(2007, into the risk management domain. Thanks to the open nature of the architecture andservices being developed within these projects, they can be implemented by any interestedparty and can be accessed by all potential users. The architecture is based around a serviceorientedapproach that makes use of Internet-based applications (web services whose inputsand outputs conform to standards. The benefit of this philosophy is that it is expected tofavor the emergence of an operational market for risk management services in Europe, iteliminates the need to replace or radically alter the hundreds of already operational ITsystems in Europe (drastically lowering costs for users, and it allows users and stakeholdersto achieve interoperability while using the system most adequate to their needs, budgets,culture etc. (i.e. it has flexibility.

Ralf Denzer

2008-03-01

49

Enabling Context-Aware Web Services Methods, Architectures, and Technologies  

CERN Document Server

With recent advances in radio-frequency identification (RFID) technology, sensor networks, and enhanced Web services, the original World Wide Web is continuing its evolution into what is being called the Web of Things and Services. Such a Web will support an ultimately interactive environment where everyday physical objects such as buildings, sidewalks, and commodities become recognizable, addressable, and even controllable via a mostly ubiquitous Web. This integration of the physical and virtual worlds will fundamentally impact the way we live and in doing so afford tremendous new business op

Sheng, Quan Z

2010-01-01

50

Semantic Web on Scope: A New Architectural Model for the Semantic Web  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Problem Statement: Current web contains billions of documents and has many administrative problems and limitations; in addition to that the web content is still accessible only to humans. The solution to these problems is the Semantic Web. The Semantic Web is considered to be the extension for the current web. But there are problems facing the Semantic Web now, such as there is no clear architecture for it, there are four versions created by Tim Berners-Lee, but still up to now there i...

Al-feel, Haytham T.; Magdy Koutb; Hoda Suoror

2008-01-01

51

A Novel Architecture for Topic Specific Parallel Web Crawler  

Directory of Open Access Journals (Sweden)

Full Text Available The World Wide Web is an interlinked collection of billions of web documents. Due to the growing and dynamic nature of the web, it has become a challenge to traverse all URLs in the web documents by a crawler module. So it has become imperative to parallelize a crawling process. The crawler process is further being parallelized in the form ecology of crawler workers that in parallel download information from the web. This paper proposes a novel architecture of parallel crawler, which is based on topic specific crawling, makes crawling task more effective, scalable and load-sharing among the different crawlers which parallel downloading the web pages related to different topics. The proposed crawler will crawl and download the web pages which are related to given topic(s.

Navita

2014-05-01

52

An Examination of System Architectures for Distributing Sensor Data Via Ethernet Networks  

Energy Technology Data Exchange (ETDEWEB)

Application of the World Wide Web (WWW) for the transfer of sensor data from remote locations to laboratories and offices is a largely ignored application of the WWW. We have investigated several architectures for this application including simple web server/client architectures and variations of this approach. In addition, we have evaluated several commercial approaches and other techniques that have been investigated and are in the literature. Finally, we have provided conclusions based on the results of our study offering suggestions about the advantages and disadvantages of each of the approaches studied.

PFEIFER, KENT B.; CERNOSEK, RICHARD W.; MARTIN, STEPHEN J.; WALDSCHMIDT, R.L.; RUMPF, A.N.

2001-01-01

53

Electrochemical Biosensors - Sensor Principles and Architectures  

Directory of Open Access Journals (Sweden)

Full Text Available Quantification of biological or biochemical processes are of utmost importancefor medical, biological and biotechnological applications. However, converting the biologicalinformation to an easily processed electronic signal is challenging due to the complexity ofconnecting an electronic device directly to a biological environment. Electrochemical biosensorsprovide an attractive means to analyze the content of a biological sample due to thedirect conversion of a biological event to an electronic signal. Over the past decades severalsensing concepts and related devices have been developed. In this review, the most commontraditional techniques, such as cyclic voltammetry, chronoamperometry, chronopotentiometry,impedance spectroscopy, and various field-effect transistor based methods are presented alongwith selected promising novel approaches, such as nanowire or magnetic nanoparticle-basedbiosensing. Additional measurement techniques, which have been shown useful in combinationwith electrochemical detection, are also summarized, such as the electrochemical versionsof surface plasmon resonance, optical waveguide lightmode spectroscopy, ellipsometry,quartz crystal microbalance, and scanning probe microscopy.The signal transduction and the general performance of electrochemical sensors are often determinedby the surface architectures that connect the sensing element to the biological sampleat the nanometer scale. The most common surface modification techniques, the various electrochemicaltransduction mechanisms, and the choice of the recognition receptor moleculesall influence the ultimate sensitivity of the sensor. New nanotechnology-based approaches,such as the use of engineered ion-channels in lipid bilayers, the encapsulation of enzymesinto vesicles, polymersomes, or polyelectrolyte capsules provide additional possibilities forsignal amplification.In particular, this review highlights the importance of the precise control over the delicateinterplay between surface nano-architectures, surface functionalization and the chosen sensortransducer principle, as well as the usefulness of complementary characterization tools tointerpret and to optimize the sensor response.

Erik Reimhult

2008-03-01

54

Web Services Security Architectures for Secure Service Oriented Analysis and Design  

Directory of Open Access Journals (Sweden)

Full Text Available This paper discusses the research methodology on Web Services Security Architectures for Secure Service Oriented Analysis and Design. Initially we discuss about the Research Methodology for Designing Dependable Agile Layered Security Architecture Solutions for Web Services Security Architectures. Finally we discuss an implementation case study of ensuring data security architecture on Web Services Cloud

D.Shravani #1 , Dr.P.Suresh Varma*2 , Dr.B.Padmaja Rani #3 , K.Venkateswar Rao*4M.Upendra Kumar#5

2011-04-01

55

A Lightweight Access for Hybrid Mobile Web Cloud Content Architecture  

Directory of Open Access Journals (Sweden)

Full Text Available The web was first design to just provide information that could be hosted over traditional client server model, the fast growth of web content and large numbers of web content today, trend to utilize the cloud computing and hyper mobile web, which provide instant computing power, scalability, availability, saving time and administration effort. Today there is an increasing demand for accessing the Internet from mobile devices, which becoming very popular, mobile web access now is an integral part of our lives, as the majority of current web content ignore the mobility, which considered as a great challenge for web content creators. The main requirement when talking about the context of web future, is to enhance both features of cloud computing and mobile web content, by achieving the hybrid mobile web cloud content this allow us faster access technique, and enjoy with most benefits for mobile mashup for cloud computing. The main contribution of this paper is to combine the mobile web with cloud computing, to introduce an innovative computing model, called mobile cloud computing. By implementation the proposed architecture style experimental results show that the access response and excitation time is decreased, we gain a minimized transfer data size, and strongly utilizing the three screen vision view.

Shawkat K. Guirguis

2014-09-01

56

Terra Harvest: an open, integrated battlefield unattended ground sensors architecture  

Science.gov (United States)

The Defense Intelligence Agency (DIA) is developing Terra Harvest, an open, integrated battlefield unattended ground sensors (UGS) architecture that will employ multiple, flexible sensors via standards-based integration. The Terra Harvest open architecture separates the UGS system into fundamental components and standardizes internal and external interfaces to optimize interoperability. Other acquisition programs can take advantage of this open architecture to meet challenging mission requirements.

Heathcock, Robert; Brasch, Colson

2011-06-01

57

An Architecture to Implement Event-Driven Web Monitoring Systems  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Traditional monitoring systems are based on C/S mode because desktop software still has inherent advantages though desktop software is replaced by web applications rapidly in many fields. Meanwhile, traditional monitoring systems use relational database as data source, however, relational database lacks the ability to process influx of queries per second. In this paper, we will do an in-depth research to design an architecture to implement event-driven web monitoring systems.    

Gao Ying; Mu Lei; Hao Zhonghu; Zheng Weiyang

2013-01-01

58

An Architecture to Implement Event-Driven Web Monitoring Systems  

Directory of Open Access Journals (Sweden)

Full Text Available Traditional monitoring systems are based on C/S mode because desktop software still has inherent advantages though desktop software is replaced by web applications rapidly in many fields. Meanwhile, traditional monitoring systems use relational database as data source, however, relational database lacks the ability to process influx of queries per second. In this paper, we will do an in-depth research to design an architecture to implement event-driven web monitoring systems.    

Gao Ying

2013-10-01

59

DE LAS REDES INALÁMBRICAS DE GEOSENSORES A LA WEB DE SENSORES  

Directory of Open Access Journals (Sweden)

Full Text Available RESUMEN En el presente artículo se realiza una breve descripción del estado del arte de las redes inalámbricas de geosensores, hasta la Web de sensores, y los servicios de notificación y registro que el Consorcio Abierto Geoespacial (Open Geospatial Consortium, OGC ha definido para la implementación de dichos servicios. Se parte de una concepción de la redes inalámbricas, luego se va a las redes inalámbricas de geosensores, la aplicación de estas en la parte ambiental, así como una descripción de Sensor Web enablement, la computación grid, las arquitecturas orientadas a servicios (Service Oriented Architecture, SOA, y como estos conceptos convergen en la Web de sensores, y específicamente se habla de dos servicios: notificación y registro. ABSTRACT It comes true with present article one brief description of the status of the art of the wireless nets of geosensors, to the Web of sensors, and then little serviceof notification and record that the OGC has defined for the implementation of the aforementioned services.It is started with a wireless network conception and then goes to geosensors wireless networks, the application of these in the environmental part, as well as Sensor Web enablement, grid computing, SOA, and as these concepts converge in the sensor Web, and specifically it talk about two services: Notification and registry.

Carmen Inés Báez Pérez

2007-12-01

60

Sensor-web Operations Explorer (SOX)  

Science.gov (United States)

The Sensor-web Operations Explorer (SOX) is a research task under the Advanced Information Systems Technology project of the National Aeronautics and Space Administration (NASA). The objective of SOX is to develop an integrated software infrastructure (combining air-quality observations with models and data- assimilation tools) that permits a focused analysis of the chemical state and that can adapt to meteorological and chemical "events" over daily time scales. Processes governing the distribution and evolution of trace gases and aerosols have a profound impact on air quality and climate. Trace gases and aerosols do not only affect air quality, but they may also impact regional and global climate through longer-lived greenhouse gases, e.g., O3, CO2, and CH4 Aerosols can have a net cooling or heating effect depending on their type and vertical distribution. The quantification of these processes requires an integrated approach that combines observations from satellites, aircraft, sondes, and surface measurements with chemistry and transport models acting on both regional and global scales. The integrated observation is approached in two modes, an exploratory observation mode and a targeted observation mode. Currently, the exploratory observation mode is fully supported by the SOX on-line service employing a concept-design and an observing system simulation experiments (OSSE) framework. The exploration process needs to be iterated for maturation of a complex sensor-web operation scenario design. For the targeted observation mode, a 4D-variational adjoint framework is being developed in collaboration with the Global Earth Observation System for Chemistry (GEOS-Chem) research teams at Jet Propulsion Laboratory and Havard University. In addition to remote sensing, advances in global chemistry and transport models (along with 4-D variational assimilation techniques) provide powerful tools for the development of sensor webs that could, in principle, be deployed at operational time scales to provide up-to-date information on air pollution useful for decision support as well as enhanced scientific return. The integrated campaign plan describes the assets used in a sensor web along with the assimilation and modeling technologies that combine these assets. Currently, the SOX system can support OSSEs for air-borne sensors and for space-borne sensors (in low- Earth orbit (LEO) and geosynchronous Earth orbit (GEO)). The SOX system supports integrated air-quality campaigns involving both space-borne and air-borne sensors by forecasting the influence of current observations over the entire globe at multiple atmospheric layers and by analyzing the maximum impact zone. In the future, the SOX system will complete the development extending the OSSE services to include in-situ sensors that track surface emissions. The SOX technologies are being infused to several mission concept studies including the Climate Absolute Radiance and Refractivity Observatory (CLARREO) and the Geostationary Coastal and Air Pollution Events (GEOCAPE), part of theTier-1 and Tier-2 missions recommended by the NRC decadal survey. This paper will present technical approaches and implementation details to achieve these successful technology infusions.

Lee, M.; Weidner, R.; Bowman, K.; Sandu, A.; Singh, K.

2008-12-01

 
 
 
 
61

Web Application’s Reliability Improvement Through Architectural Patterns  

Directory of Open Access Journals (Sweden)

Full Text Available Scalability and availability are two highly desirable attributes pertaining to reliability of a web application that renders state-of-the-art services to online users. In simple words scalability is the ability to grow, the ability to serve increased number of requests or clients. Building a scalable application with round the clock availability is a challenging problem in the light of ever increasing population of potential users. Dramatic increase in users to web application causes bursts of requests that put the application to acid test. On the other hand web application availability represents the degree of operational continuity. High availability and unlimited scalability are the two indispensable quality attributes a web application in the real word. These features bestow rich user experience as far as operational continuity and ability to handle growing workload are concerned. By taking server side measures it is possible to achieve these two desirable features. However, there is possibility to have architectural pattern along with underlying design patterns to promote these quality features of web application. In this paper we enhance our architectural pattern eXtensible Web Application Development Framework (XWADF that can leverage the quality of web application design as it result in highly scalable with high availability. As the application is designed in XWADF framework it promotes scalability assuming server side supports in terms of resources. The application also ensures availability as the design supports maintenance without letting the application down. The empirical results revealed that our architectural approach increases reliability of web applications significantly in terms of availability and scalability

Md Umar Khan

2014-07-01

62

A Hybrid Architecture for Implementing Efficient Geospatial Web Services: Integrating .Net Remoting and Web Services Technologies  

Directory of Open Access Journals (Sweden)

Full Text Available Open GIS Consortium (OGC Geospatial Web services have been introduced to overcome spatial non-interoperability problem associated with most geospatial processing systems. Although OGC geospatial Web services provide interoperability among heterogeneous geospatial processing systems, in some cases they can not provide required performance and efficiency. This study proposes a hybrid architecture which can efficiently provide interoperability and high performance for transferring geospatial data. It is suggested that making use of Web services technologies for implementing OGC geospatial Web services would significantly facilitate sharing geospatial data in heterogeneous environments like Web. In addition, making use of a proprietary and platform-dependant technologies can provide best performance and efficiency in homogeneous environments like an internal network. In this context, design and development of an OGC geospatial Web service using hybrid architecture of Web services Technologies and .NET Remoting technology (as proprietary and .NET specific technology is described. Based on our evaluations and practical tests, the hybrid architecture proved to be an efficient solution for development of geospatial Web services.

Pouria Amirian

2008-01-01

63

Smart Sensor Web: experiment #2 results  

Science.gov (United States)

The Smart Sensor Web (SSW) project was a two year effort sponsored by the Deputy Undersecretary of Defense for Science and Technology (DUSD(S&T)). The vision of the SSW is an intelligent, web-centric distribution and fusion of sensor information that provides greatly enhanced local situational awareness, on demand, to warfighters at lower echelons (battalion/squadron and below). The project examined critical technical issues associated with developing such a system in a joint operational context, including Army, Marine, Air Force and SOF elements. Key constraints in an SSW system include energy, communications bandwidth, latency, and information presentation. This analysis is focused on information generation as far forward as possible to minimize bandwidth requirements and maximize the use of continually improving processing and memory capability. It also focuses on the problem of information fusion and presentation, ensuring that only mission relevant and understandable information is presented to the warfighter. The key mechanism for addressing these concepts is the SSW test bed, a combination of virtual and live assets. Two operational vignettes were used during the second experiment using the test bed: (1) dismounted infantry conducting operations on urban terrain, and (2) the employment of wide-area search munitions such as the Air Force's Low Cost Autonomous Attack System (LOCAAS) in a cooperative attack environment. This paper will focus on the concept for the experiment, some of the key technical issues addressed, the interplay of the simulation methods used, and results from the final live experiment conducted in January 2002.

Bjorkman, Eileen A.; Mackin, Joseph P.; Sciarretta, Albert

2002-08-01

64

Simple environmental sensor webs for classroom inquiry  

Science.gov (United States)

This paper describes a platform for inquiry-driven learning in environmental science at the secondary and undergraduate levels including preliminary results from two pilot sensor web-driven projects, in progress. The work presented here emphasizes - Documenting construction and use of the platform - Analysis of results over technology used - Open-ended iteration of the inquiry process Cognitive theory suggests that pedagogical modes of 'information-transfer' fall short as a means of building (arguably useful) problem solving and critical thinking skills in comparison with inquiry-driven modes. In view of limited classroom time and constraints such as standardized testing, sensor web-driven environmental inquiry faces a two-fold challenge: Minimize time-intrusion into the curriculum and make that time highly productive and valuable for students. The technology employed here is a wireless microcomputer network ruggedized for outdoor use, interfaces to simple environmental sensors, supplemental data from a low-cost meteorological station, and data recovery and analysis by means of a laptop PC. Target cost of the system (not including the PC) is 2000USD. The baseline study subject is watershed hydrology, with a corollary aim of "identifiying the doorways" into related subjects and story lines. The general plan of action proceeds in these steps: - Build and test the system - Students work with the system in the classroom - Students formulate a deployment plan - Instruments deployed, data acquired and formatted - Student analysis, hypothesis generation, research - Reiterate the previous three steps as possible Once this platform/program is established the idea is to expand to include personalized reflection and self- expression per the curriculum established by the River of Words non-profit organization. The second expansion idea is (per the eScience model) to facilitate Internet-based exchanges and equipment sharing with students located in other geographical regions and countries.

Fatland, D. R.

2007-12-01

65

A Hybrid Web Browser Architecture for Mobile Devices  

Directory of Open Access Journals (Sweden)

Full Text Available Web browsing on mobile networks is slow in comparison to wired or Wi-Fi networks. Particularly, the connection establishment phase including DNS lookups and TCP handshakes takes a long time on mobile networks due to its long round-trip latency. In this paper, we propose a novel web browser architecture that aims to improve mobile web browsing performance. Our approach delegates the connection establishment and HTTP header field delivery tasks to a dedicated proxy server located at the joint point between the WAN and mobile network. Since the traffic for the connection establishment and HTTP header fields delivery passes only through the WAN between the proxy and web servers, our approach significantly reduces both the number and size of packets on the mobile network. Our evaluation showed that the proposed scheme reduces the number of mobile network packets by up to 42% and, consequently, the average page loading time is shortened by up to 52%.

CHO, J.

2014-08-01

66

Resource-oriented architecture patterns for webs of data  

CERN Document Server

The surge of interest in the REpresentational State Transfer (REST) architectural style, the Semantic Web, and Linked Data has resulted in the development of innovative, flexible, and powerful systems that embrace one or more of these compatible technologies. However, most developers, architects, Information Technology managers, and platform owners have only been exposed to the basics of resource-oriented architectures. This book is an attempt to catalog and elucidate several reusable solutions that have been seen in the wild in the now increasingly familiar ""patterns book"" style. These are

Sletten, Brian

2013-01-01

67

Sensor Web Services for Early Flood Warnings Based on Soil Moisture Profiles  

Science.gov (United States)

As result of improved computing and communication capabilities, the use of sensors and sensor networks for environmental monitoring has gained considerable importance in the recent years. For an interoperable integration of sensor data like sensor descriptions, sensor measurements and alarm events, the Open Geospatial Consortium (OGC) started the Sensor Web Enablement (SWE) initiative and proposed several specifications in respect to a geospatial sensor web. First implementations of SWE software frameworks are available. In this paper, we present the results of the recent WEBBOS project. Its objective was to build up a system for early flood warnings by measuring soil moisture profiles. The use of soil moisture profiles is motivated by the fact that traditional approaches like the observation of water gauges are suitable for the prediction of large-river flooding but not for smaller drainage areas. We describe the architecture of our system and how it is built up by using existing software components to a large extent. Our special focus is on the incorporation of 3D soil moisture profiles into the SWE data model, on the integration of the new OGC Sensor Event Service, and on the development of a flexible web client for mapping and other visualization purposes.

Brinkhoff, T.; Jansen, S.

2012-08-01

68

A Web-based Architecture Enabling Multichannel Telemedicine Applications  

Directory of Open Access Journals (Sweden)

Full Text Available Telemedicine scenarios include today in-hospital care management, remote teleconsulting, collaborative diagnosis and emergency situations handling. Different types of information need to be accessed by means of etherogeneous client devices in different communication environments in order to enable high quality continuous sanitary assistance delivery wherever and whenever needed. In this paper, a Web-based telemedicine architecture based on Java, XML and XSL technologies is presented. By providing dynamic content delivery services and Java based client applications for medical data consultation and modification, the system enables effective access to an Electronic Patient Record based standard database by means of any device equipped with a Web browser, such as traditional Personal Computers and workstation as well as modern Personal Digital Assistants. The effectiveness of the proposed architecture has been evaluated in different scenarios, experiencing fixed and mobile clinical data transmissions over Local Area Networks, wireless LANs and wide coverage telecommunication network including GSM and GPRS.

Fabrizio Lamberti

2003-02-01

69

Web Service Architecture for a Meta Search Engine  

Directory of Open Access Journals (Sweden)

Full Text Available With the rapid advancements in Information Technology, Information Retrieval on Internet is gaining its importance day by day. Nowadays there are millions of Websites and billions of homepages available on the Internet. Search Engines are the essential tools for the purpose of retrieving the required information from the Web. But the existing search engines have many problems such as not having wide scope, imbalance in accessing the sites etc. So, the effectiveness of a search engine plays a vital role. Meta search engines are such systems that can provide effective information by accessing multiple existing search engines such as Dog Pile, Meta Crawler etc, but most of them cannot successfully operate on heterogeneous and fully dynamic web environment. In this paper we propose a Web Service Architecture for Meta Search Engine to cater the need of heterogeneous and dynamic web environment. The objective of our proposal is to exploit most of the features offered by Web Services through the implementation of a Web Service Meta Search Engine.

K.Srinivas

2011-10-01

70

SOA based Data Architecture for HTML5 Web Applications  

Directory of Open Access Journals (Sweden)

Full Text Available Web Services based architectures have already been established as the preferred way to integrate SOA specific components, from the front-end to the back-end business services. One of the key elements of such architecture are data-based or entity services. In this context, SDO standard and SDO related technologies have been confirmed as a possible approach to aggregate such enterprise-wide federation of data services, mainly backed by database servers, but not limited to them. In the followings, we will discuss an architectural purpose based on SDO approach to seamlessly integrate presentation and data services within an enterprise SOA context. This way we will outline the benefits of a common end-to-end data integration strategy. Also, we will try to argue that using HTML5 based clients as front end services in conjunction with SDO data services could be an effective strategy to adopt the mobile computing in the enterprise context.

Catalin STRIMBEI

2013-01-01

71

A reference web architecture and patterns for real-time visual analytics on large streaming data  

Science.gov (United States)

Monitoring and analysis of streaming data, such as social media, sensors, and news feeds, has become increasingly important for business and government. The volume and velocity of incoming data are key challenges. To effectively support monitoring and analysis, statistical and visual analytics techniques need to be seamlessly integrated; analytic techniques for a variety of data types (e.g., text, numerical) and scope (e.g., incremental, rolling-window, global) must be properly accommodated; interaction, collaboration, and coordination among several visualizations must be supported in an efficient manner; and the system should support the use of different analytics techniques in a pluggable manner. Especially in web-based environments, these requirements pose restrictions on the basic visual analytics architecture for streaming data. In this paper we report on our experience of building a reference web architecture for real-time visual analytics of streaming data, identify and discuss architectural patterns that address these challenges, and report on applying the reference architecture for real-time Twitter monitoring and analysis.

Kandogan, Eser; Soroker, Danny; Rohall, Steven; Bak, Peter; van Ham, Frank; Lu, Jie; Ship, Harold-Jeffrey; Wang, Chun-Fu; Lai, Jennifer

2013-12-01

72

Secure, Autonomous, Intelligent Controller for Integrating Distributed Sensor Webs  

Science.gov (United States)

This paper describes the infrastructure and protocols necessary to enable near-real-time commanding, access to space-based assets, and the secure interoperation between sensor webs owned and controlled by various entities. Select terrestrial and aeronautics-base sensor webs will be used to demonstrate time-critical interoperability between integrated, intelligent sensor webs both terrestrial and between terrestrial and space-based assets. For this work, a Secure, Autonomous, Intelligent Controller and knowledge generation unit is implemented using Virtual Mission Operation Center technology.

Ivancic, William D.

2007-01-01

73

Lessons Learned from Web-Enhanced Teaching in Landscape Architecture Studios  

Science.gov (United States)

The purpose of this article was to summarize lessons learned from implementing web-enhanced teaching in landscape architecture studio courses. The lessons are documented as challenges and opportunities based on a two-year assessment study of web-enhanced landscape architecture construction studios. This article will help landscape architecture

Li, Ming-Han

2007-01-01

74

Enhanced Architecture of a Web Warehouse based on Quality Evaluation Framework to Incorporate Quality Aspects in Web Warehouse Creation  

Directory of Open Access Journals (Sweden)

Full Text Available In the recent years, it has been observed that World Wide Web (www became a vast source of information explosion about all areas of interest. Relevant information retrieval is difficult from the web space as there is no universal configuration and organization of the web data. Taking the advantage of data warehouse functionality and integrating it with the web to retrieve relevant data is the core concept of web warehouse. It is a repository that store relevant web data for business decision making. The basic function of web warehouse is to collect and store the information for analysis of users. The quality of web warehouse data affects a lot on data analysis. To enhance the quality of decision making different quality dimensions must be incorporated in web warehouse architecture. In this paper enhanced web warehouse architecture is proposed and discussed. The enhancement in the existing architecture is based on the quality evaluation framework. The enhanced architecture adds three layers in existing architecture to insure quality at various phases of web warehouse system creation. The source assessment, query evaluation and data quality layers enhance the quality of data store in web warehouse.

Umm-e-Mariya Shah

2011-01-01

75

Sensor Web Dynamic Measurement Techniques and Adaptive Observing Strategies  

Science.gov (United States)

Sensor Web observing systems may have the potential to significantly improve our ability to monitor, understand, and predict the evolution of rapidly evolving, transient, or variable environmental features and events. This improvement will come about by integrating novel data collection techniques, new or improved instruments, emerging communications technologies and protocols, sensor mark-up languages, and interoperable planning and scheduling systems. In contrast to today's observing systems, "event-driven" sensor webs will synthesize real- or near-real time measurements and information from other platforms and then react by reconfiguring the platforms and instruments to invoke new measurement modes and adaptive observation strategies. Similarly, "model-driven" sensor webs will utilize environmental prediction models to initiate targeted sensor measurements or to use a new observing strategy. The sensor web concept contrasts with today's data collection techniques and observing system operations concepts where independent measurements are made by remote sensing and in situ platforms that do not share, and therefore cannot act upon, potentially useful complementary sensor measurement data and platform state information. This presentation describes NASA's view of event-driven and model-driven Sensor Webs and highlights several research and development activities at the Goddard Space Flight Center.

Talabac, Stephen J.

2004-01-01

76

Coordinated Science Campaign Scheduling for Sensor Webs  

Science.gov (United States)

Future Earth observing missions will study different aspects and interacting pieces of the Earth's eco-system. Scientists are designing increasingly complex, interdisciplinary campaigns to exploit the diverse capabilities of multiple Earth sensing assets. In addition, spacecraft platforms are being configured into clusters, trains, or other distributed organizations in order to improve either the quality or the coverage of observations. These simultaneous advances in the design of science campaigns and in the missions that will provide the sensing resources to support them offer new challenges in the coordination of data and operations that are not addressed by current practice. For example, the scheduling of scientific observations for satellites in low Earth orbit is currently conducted independently by each mission operations center. An absence of an information infrastructure to enable the scheduling of coordinated observations involving multiple sensors makes it difficult to execute campaigns involving multiple assets. This paper proposes a software architecture and describes a prototype system called DESOPS (Distributed Earth Science Observation Planning and Scheduling) that will address this deficiency.

Edgington, Will; Morris, Robert; Dungan, Jennifer; Williams, Jenny; Carlson, Jean; Fleming, Damian; Wood, Terri; Yorke-Smith, Neil

2005-01-01

77

SSWAP: A Simple Semantic Web Architecture and Protocol for semantic web services  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background SSWAP (Simple Semantic Web Architecture and Protocol; pronounced "swap" is an architecture, protocol, and platform for using reasoning to semantically integrate heterogeneous disparate data and services on the web. SSWAP was developed as a hybrid semantic web services technology to overcome limitations found in both pure web service technologies and pure semantic web technologies. Results There are currently over 2400 resources published in SSWAP. Approximately two dozen are custom-written services for QTL (Quantitative Trait Loci and mapping data for legumes and grasses (grains. The remaining are wrappers to Nucleic Acids Research Database and Web Server entries. As an architecture, SSWAP establishes how clients (users of data, services, and ontologies, providers (suppliers of data, services, and ontologies, and discovery servers (semantic search engines interact to allow for the description, querying, discovery, invocation, and response of semantic web services. As a protocol, SSWAP provides the vocabulary and semantics to allow clients, providers, and discovery servers to engage in semantic web services. The protocol is based on the W3C-sanctioned first-order description logic language OWL DL. As an open source platform, a discovery server running at http://sswap.info (as in to "swap info" uses the description logic reasoner Pellet to integrate semantic resources. The platform hosts an interactive guide to the protocol at http://sswap.info/protocol.jsp, developer tools at http://sswap.info/developer.jsp, and a portal to third-party ontologies at http://sswapmeet.sswap.info (a "swap meet". Conclusion SSWAP addresses the three basic requirements of a semantic web services architecture (i.e., a common syntax, shared semantic, and semantic discovery while addressing three technology limitations common in distributed service systems: i.e., i the fatal mutability of traditional interfaces, ii the rigidity and fragility of static subsumption hierarchies, and iii the confounding of content, structure, and presentation. SSWAP is novel by establishing the concept of a canonical yet mutable OWL DL graph that allows data and service providers to describe their resources, to allow discovery servers to offer semantically rich search engines, to allow clients to discover and invoke those resources, and to allow providers to respond with semantically tagged data. SSWAP allows for a mix-and-match of terms from both new and legacy third-party ontologies in these graphs.

Town Christopher D

2009-09-01

78

Low data rate architecture for smart image sensor  

Science.gov (United States)

An innovative smart image sensor architecture based on event-driven asynchronous functioning is presented in this paper. The proposed architecture has been designed in order to control the sensor data flow by extracting only the relevant information from the image sensor and performing spatial and temporal redundancies suppression in video streaming. We believe that this data flow reduction leads to a system power consumption reduction which is essential in mobile devices. In this first proposition, we present our new pixel behaviour as well as our new asynchronous read-out architecture. Simulations using both Matlab and VHDL were performed in order to validate the proposed pixel behaviour and the reading protocol. These simulations results have met our expectations and confirmed the suggested ideas.

Darwish, Amani; Sicard, Gilles; Fesquet, Laurent

2014-03-01

79

Sensor Web and Intelligent Sensors for Earth Science Applications  

Science.gov (United States)

There is a significant interest in the Earth Science remote sensing community in substantially increasing the number of observations relative to the current frequency of collection. The obvious reason for such a push is to improve the temporal and surface coverage of measurements. However, there is little analysis available in terms of benefits, costs and optimized set of sensors needed to make these necessary observations. This is a complex problem that should be carefully studied and balanced over many boundaries. For example, the question of technology maturity versus users' desire for obtaining additional measurements is noncongruent. This is further complicated by the limitations of the laws of physics and the economic conditions. With the advent of advanced technology, it is anticipated that developments in spacecraft technology will enable advanced capabilities to become more affordable. However, specialized detector subsystems, and precision flying techniques may still require substantial innovation, development time and cost. Additionally, the space deployment scheme should also be given careful attention because of the high associated expense. Nonetheless, it is important to carefully examine the science priorities and steer the development efforts that can commensurate with the tangible requirements. This presentation will focus on a possible set of architectural concepts beneficial for future Earth science studies and research its and potential benefits.

Habib, Shahid

2002-01-01

80

Collaborative Learning under an Adaptive Web-based Architecture  

Directory of Open Access Journals (Sweden)

Full Text Available In any one class, there are differences between student`s abilities, interests, achievements, preferences and learning behaviors. Some need a challenging class, promoting their level. Some of them want to keep to the working routine. Others need to be taught very slowly. This situation is particularly notable in mathematics instruction. Many teachers feel frustrated because they want to provide for all student`s needs and abilities but are constrained by time and space. In this study, we propose an adaptive web-based learning architecture, based on a collaborative model and a tutor model, to help solve the problem. Students can learn at their own pace, constructing knowledge by collaborative learning and using tutor assistance to solve their problems immediately. The research on our learning architecture was conducted with fourth grade primary school students learning fractional operation.

H.C. Chiang

2005-01-01

 
 
 
 
81

Search and tracking system architecture using 1-D scanning sensors  

Science.gov (United States)

In the maritime environment, It is necessary for ship's self protection to search ad track approaching targets. We developed high performance search and tracking system with Infrared sensors. Our system can obtain high performance with several FPGAs and COTS processing boards. Dual band IR sensor (MWIR and LWIR) also gives two types of target detection and tracing abilities. Our system designed to automatically detect and track both air and surface targets such as sea skimming missiles, small ships, and aircrafts at a long range. In this paper, we describe technologies in our search and tracking system architecture. We describe software architecture for signal processing and target detection and tracking algorithms as well.

Nam, Sanghoon; Choi, Byungin; Joung, Shichang; Kim, Jaein

2010-04-01

82

Web based aphasia test using service oriented architecture (SOA)  

Science.gov (United States)

Based on an aphasia test for Spanish speakers which analyze the patient's basic resources of verbal communication, a web-enabled software was developed to automate its execution. A clinical database was designed as a complement, in order to evaluate the antecedents (risk factors, pharmacological and medical backgrounds, neurological or psychiatric symptoms, brain injury -anatomical and physiological characteristics, etc) which are necessary to carry out a multi-factor statistical analysis in different samples of patients. The automated test was developed following service oriented architecture and implemented in a web site which contains a tests suite, which would allow both integrating the aphasia test with other neuropsychological instruments and increasing the available site information for scientific research. The test design, the database and the study of its psychometric properties (validity, reliability and objectivity) were made in conjunction with neuropsychological researchers, who participate actively in the software design, based on the patients or other subjects of investigation feedback.

Voos, J. A.; Vigliecca, N. S.; Gonzalez, E. A.

2007-11-01

83

Web based aphasia test using service oriented architecture (SOA)  

Energy Technology Data Exchange (ETDEWEB)

Based on an aphasia test for Spanish speakers which analyze the patient's basic resources of verbal communication, a web-enabled software was developed to automate its execution. A clinical database was designed as a complement, in order to evaluate the antecedents (risk factors, pharmacological and medical backgrounds, neurological or psychiatric symptoms, brain injury -anatomical and physiological characteristics, etc) which are necessary to carry out a multi-factor statistical analysis in different samples of patients. The automated test was developed following service oriented architecture and implemented in a web site which contains a tests suite, which would allow both integrating the aphasia test with other neuropsychological instruments and increasing the available site information for scientific research. The test design, the database and the study of its psychometric properties (validity, reliability and objectivity) were made in conjunction with neuropsychological researchers, who participate actively in the software design, based on the patients or other subjects of investigation feedback.

Voos, J A [Clinical Engineering R and D Center, Universidad Tecnologica Nacional, Facultad Regional Cordoba, Cordoba (Argentina); Vigliecca, N S [Consejo Nacional de Investigaciones Cientificas y Tecnicas, CONICET, Cordoba (Argentina); Gonzalez, E A [Clinical Engineering R and D Center, Universidad Tecnologica Nacional, Facultad Regional Cordoba, Cordoba (Argentina)

2007-11-15

84

Web-based Context-Aware m-Learning Architecture  

Directory of Open Access Journals (Sweden)

Full Text Available Context awareness is essential in mobile learning being a highly personalized environment with diverse capabilities. Major challenges of context awareness are to define the learning context, how to sense it, and how to react to changes. Our proposed system provides a general architecture that facilitates contextualization using current widely-used web standards. It provides a systematic approach to achieve contextualization defining major components and their functionalities without deepening into details. It uses web services to connect to resources making them reusable and distributable. In addition, all technologies and platforms proposed in our system are available under General Public License (GPL hence facilitating immediate implementation. The paper ends with a real world scenario where m-Learning could be the only solution.

Rachid Benlamri

2007-10-01

85

GPS Sensor Web Time Series Analysis Using SensorGrid Technology  

Science.gov (United States)

We present a method for performing signal detection and classification on real-time streams of GPS sensor web data. Our approach has two parts. The first is a hidden Markov model fitting methodology that enables us to robustly describe the statistics of the data. The second is the SensorGrid technology which allows us to manage the data streams through a series of filters tied together with a publish/subscribe messaging system. In this framework, the HMM algorithm is viewed as a filter. The sensor web data we use in this work comes from the Southern California Integrated GPS Network (SCIGN), which produces a number of data products. In this work, we use the real-time (1Hz for most stations) three-dimensional position information. This data is collected from a system which is not only noisy but also poorly understood; driving forces on the system derive not only from the physical processes of the solid earth but also from external factors, including atmospheric effects and human activity. Fitting an HMM to time series allows us to describe the statistics of the data in a simple way that ascribes discrete modes of behavior to the system. By matching incoming data against the statistics of previously learned modes, we can perform classification according to the best match. In addition, we can perform signal detection across the entire sensor web by correlating mode changes in time; a significant number of mode changes across the network or within a certain sub-network is an indication of an event that is occurring over a wide geographical area. For most applications, reliable HMM fitting results are achieved by using a priori information to form constraints that reduce the number of free parameters. For GPS data, however, this information is not available as the underlying system is not well understood. As a result, we use the regularized deterministic annealing expectation-maximization (RDAEM) algorithm to perform the fit. This method provides high-quality, self-consistent model fits without using a priori information (although it does not exclude the use of such information where available), at the cost of some additional computation time. We refer to the software implementation of this algorithm for HMMs as RDAHMM. To integrate this HMM technology with the GPS data streams, we used the the SensorGrid architecture. This provides a service oriented approach to support coupling real-time sensor messages with scientific applications in a Grid environment. Real-time data processing is supported by employing filters around publish/subscribe messaging system. The filters are small applications extended from a generic Filter class to inherit publish and subscribe capabilities. The measurements obtained from the sensors are usually in a proprietary binary format and need to be converted into specific formats to be used by various applications. Our approach allows chaining of several filters to achieve format conversions and data processing. In addition, we developed a proxy service to expose the filters as Web Services. This service provides basic functions to start/stop filters and get metadata descriptions. Using this service filter chains can be created and deployed remotely in a workflow environment. Currently we have basic XML schemas to describe filter metadata and filter chains. We developed and tested several filters to provide real-time access to GPS messages. Currently the system is continuously running for 7 GPS networks, about 70 GPS stations; we examine the performance of the RDAHMM and SensorGrid technologies on this data.

Granat, R.; Pierce, M.; Aydin, G.; Qi, Z.

2006-12-01

86

MASM: a market architecture for sensor management in distributed sensor networks  

Science.gov (United States)

Rapid developments in sensor technology and its applications have energized research efforts towards devising a firm theoretical foundation for sensor management. Ubiquitous sensing, wide bandwidth communications and distributed processing provide both opportunities and challenges for sensor and process control and optimization. Traditional optimization techniques do not have the ability to simultaneously consider the wildly non-commensurate measures involved in sensor management in a single optimization routine. Market-oriented programming provides a valuable and principled paradigm to designing systems to solve this dynamic and distributed resource allocation problem. We have modeled the sensor management scenario as a competitive market, wherein the sensor manager holds a combinatorial auction to sell the various items produced by the sensors and the communication channels. However, standard auction mechanisms have been found not to be directly applicable to the sensor management domain. For this purpose, we have developed a specialized market architecture MASM (Market architecture for Sensor Management). In MASM, the mission manager is responsible for deciding task allocations to the consumers and their corresponding budgets and the sensor manager is responsible for resource allocation to the various consumers. In addition to having a modified combinatorial winner determination algorithm, MASM has specialized sensor network modules that address commensurability issues between consumers and producers in the sensor network domain. A preliminary multi-sensor, multi-target simulation environment has been implemented to test the performance of the proposed system. MASM outperformed the information theoretic sensor manager in meeting the mission objectives in the simulation experiments.

Viswanath, Avasarala; Mullen, Tracy; Hall, David; Garga, Amulya

2005-03-01

87

WebML and .NET Architecture for Developing Students Appointment Management System  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This study presents the application of Web Modeling Language (WebML) in a Student Appointment Management System (SAMS) to help students and lecturers arrange meetings in an effective and efficient way in a university or college environment. WebML is well designed for web applications and .NET four-tier architecture offers maximum functionality and flexibility in a heterogeneous, web based environment. Each WebML elements is transformed accordingly to Hypertext model as known as site vi...

Nasir, M. H. N. M.; Hamid, S. H.; Hassan, H.

2009-01-01

88

Establishing the Global Fresh Water Sensor Web  

Science.gov (United States)

This paper presents an approach to measuring the major components of the water cycle from space using the concept of a sensor-web of satellites that are linked to a data assimilation system. This topic is of increasing importance, due to the need for fresh water to support the growing human population, coupled with climate variability and change. The net effect is that water is an increasingly valuable commodity. The distribution of fresh water is highly uneven over the Earth, with both strong latitudinal distributions due to the atmospheric general circulation, and even larger variability due to landforms and the interaction of land with global weather systems. The annual global fresh water budget is largely a balance between evaporation, atmospheric transport, precipitation and runoff. Although the available volume of fresh water on land is small, the short residence time of water in these fresh water reservoirs causes the flux of fresh water - through evaporation, atmospheric transport, precipitation and runoff - to be large. With a total atmospheric water store of approx. 13 x 10(exp 12)cu m, and an annual flux of approx. 460 x 10(exp 12)cu m/y, the mean atmospheric residence time of water is approx. 10 days. River residence times are similar, biological are approx. 1 week, soil moisture is approx. 2 months, and lakes and aquifers are highly variable, extending from weeks to years. The hypothesized potential for redistribution and acceleration of the global hydrological cycle is therefore of concern. This hypothesized speed-up - thought to be associated with global warming - adds to the pressure placed upon water resources by the burgeoning human population, the variability of weather and climate, and concerns about anthropogenic impacts on global fresh water availability.

Hildebrand, Peter H.

2005-01-01

89

Use of the Earth Observing One (EO-1) Satellite for the Namibia SensorWeb Flood Early Warning Pilot  

Science.gov (United States)

The Earth Observing One (EO-1) satellite was launched in November 2000 as a one year technology demonstration mission for a variety of space technologies. After the first year, it was used as a pathfinder for the creation of SensorWebs. A SensorWeb is the integration of variety of space, airborne and ground sensors into a loosely coupled collaborative sensor system that automatically provides useful data products. Typically, a SensorWeb is comprised of heterogeneous sensors tied together with a messaging architecture and web services. Disasters are the perfect arena to use SensorWebs. One SensorWeb pilot project that has been active since 2009 is the Namibia Early Flood Warning SensorWeb pilot project. The Pilot Project was established under the auspices of the Namibian Ministry of Agriculture Water and Forestry (MAWF)/Department of Water Affairs, the Committee on Earth Observing Satellites (CEOS)/Working Group on Information Systems and Services (WGISS) and moderated by the United Nations Platform for Space-based Information for Disaster Management and Emergency Response (UN-SPIDER). The effort began by identifying and prototyping technologies which enabled the rapid gathering and dissemination of both space-based and ground sensor data and data products for the purpose of flood disaster management and water-borne disease management. This was followed by an international collaboration to build small portions of the identified system which was prototyped during that past few years during the flood seasons which occurred in the February through May timeframe of 2010 and 2011 with further prototyping to occur in 2012. The SensorWeb system features EO-1 data along with other data sets from such satellites as Radarsat, Terra and Aqua. Finally, the SensorWeb team also began to examine the socioeconomic component to determine the impact of the SensorWeb technology and how best to assist in the infusion of this technology in lesser affluent areas with low levels of basic infrastructure. This paper provides an overview of these efforts, highlighting the EO-1 usage in this SensorWeb.

Mandl, Daniel; Frye, Stuart; Cappelaere, Pat; Handy, Matthew; Policelli, Fritz; Katjizeu, McCloud; Van Langenhove, Guido; Aube, Guy; Saulnier, Jean-Francois; Sohlberg, Rob; Silva, Julie; Kussul, Nataliia; Skakun, Sergii; Ungar, Stephen; Grossman, Robert

2012-01-01

90

ESB-Based Sensor Web Integration for the Prediction of Electric Power Supply System Vulnerability  

Science.gov (United States)

Electric power supply companies increasingly rely on enterprise IT systems to provide them with a comprehensive view of the state of the distribution network. Within a utility-wide network, enterprise IT systems collect data from various metering devices. Such data can be effectively used for the prediction of power supply network vulnerability. The purpose of this paper is to present the Enterprise Service Bus (ESB)-based Sensor Web integration solution that we have developed with the purpose of enabling prediction of power supply network vulnerability, in terms of a prediction of defect probability for a particular network element. We will give an example of its usage and demonstrate our vulnerability prediction model on data collected from two different power supply companies. The proposed solution is an extension of the GinisSense Sensor Web-based architecture for collecting, processing, analyzing, decision making and alerting based on the data received from heterogeneous data sources. In this case, GinisSense has been upgraded to be capable of operating in an ESB environment and combine Sensor Web and GIS technologies to enable prediction of electric power supply system vulnerability. Aside from electrical values, the proposed solution gathers ambient values from additional sensors installed in the existing power supply network infrastructure. GinisSense aggregates gathered data according to an adapted Omnibus data fusion model and applies decision-making logic on the aggregated data. Detected vulnerabilities are visualized to end-users through means of a specialized Web GIS application. PMID:23955435

Stoimenov, Leonid; Bogdanovic, Milos; Bogdanovic-Dinic, Sanja

2013-01-01

91

ESB-based Sensor Web integration for the prediction of electric power supply system vulnerability.  

Science.gov (United States)

Electric power supply companies increasingly rely on enterprise IT systems to provide them with a comprehensive view of the state of the distribution network. Within a utility-wide network, enterprise IT systems collect data from various metering devices. Such data can be effectively used for the prediction of power supply network vulnerability. The purpose of this paper is to present the Enterprise Service Bus (ESB)-based Sensor Web integration solution that we have developed with the purpose of enabling prediction of power supply network vulnerability, in terms of a prediction of defect probability for a particular network element. We will give an example of its usage and demonstrate our vulnerability prediction model on data collected from two different power supply companies. The proposed solution is an extension of the GinisSense Sensor Web-based architecture for collecting, processing, analyzing, decision making and alerting based on the data received from heterogeneous data sources. In this case, GinisSense has been upgraded to be capable of operating in an ESB environment and combine Sensor Web and GIS technologies to enable prediction of electric power supply system vulnerability. Aside from electrical values, the proposed solution gathers ambient values from additional sensors installed in the existing power supply network infrastructure. GinisSense aggregates gathered data according to an adapted Omnibus data fusion model and applies decision-making logic on the aggregated data. Detected vulnerabilities are visualized to end-users through means of a specialized Web GIS application. PMID:23955435

Stoimenov, Leonid; Bogdanovic, Milos; Bogdanovic-Dinic, Sanja

2013-01-01

92

ESB-Based Sensor Web Integration for the Prediction of Electric Power Supply System Vulnerability  

Directory of Open Access Journals (Sweden)

Full Text Available Electric power supply companies increasingly rely on enterprise IT systems to provide them with a comprehensive view of the state of the distribution network. Within a utility-wide network, enterprise IT systems collect data from various metering devices. Such data can be effectively used for the prediction of power supply network vulnerability. The purpose of this paper is to present the Enterprise Service Bus (ESB-based Sensor Web integration solution that we have developed with the purpose of enabling prediction of power supply network vulnerability, in terms of a prediction of defect probability for a particular network element. We will give an example of its usage and demonstrate our vulnerability prediction model on data collected from two different power supply companies. The proposed solution is an extension of the GinisSense Sensor Web-based architecture for collecting, processing, analyzing, decision making and alerting based on the data received from heterogeneous data sources. In this case, GinisSense has been upgraded to be capable of operating in an ESB environment and combine Sensor Web and GIS technologies to enable prediction of electric power supply system vulnerability. Aside from electrical values, the proposed solution gathers ambient values from additional sensors installed in the existing power supply network infrastructure. GinisSense aggregates gathered data according to an adapted Omnibus data fusion model and applies decision-making logic on the aggregated data. Detected vulnerabilities are visualized to end-users through means of a specialized Web GIS application.

Milos Bogdanovic

2013-08-01

93

a Web Service Approach for Linking Sensors and Cellular Spaces  

Science.gov (United States)

More and more devices are starting to be connected to the Internet. In the future the Internet will not only be a communication medium for people, it will in fact be a communication environment for devices. The connected devices which are also referred as Things will have an ability to interact with other devices over the Internet, i.) provide information in interoperable form and ii.) consume /utilize such information with the help of sensors embedded in them. This overall concept is known as Internet-of- Things (IoT). This requires new approaches to be investigated for system architectures to establish relations between spaces and sensors. The research presented in this paper elaborates on an architecture developed with this aim, i.e. linking spaces and sensors using a RESTful approach. The objective is making spaces aware of (sensor-embedded) devices, and making devices aware of spaces in a loosely coupled way (i.e. a state/usage/function change in the spaces would not have effect on sensors, similarly a location/state/usage/function change in sensors would not have any effect on spaces). The proposed architecture also enables the automatic assignment of sensors to spaces depending on space geometry and sensor location.

Isikdag, U.

2013-09-01

94

Design of Real-time Communication Adapter for Different Protocol Sensors in Sensor Web  

Directory of Open Access Journals (Sweden)

Full Text Available A real-time communication adapter named SensorAdapter is designed to communicate between different protocols sensors and data service layer in Sensor Web. The adapter is extended and restructured based on SensorBus, an open source project raised by a German company called 52north. By structuring the receiving module and extending the proxies of sensors according to the communication protocols the sensors use, the adapter can receive sensing information detected by different protocols sensors simultaneously. The receiving module identifies a sensor and finds its corresponding proxy in SensorAdapter by sensor ID (SensorID, and then packages the sensing information to XMPP messages and sends them to XMPPServer by invoking the methods in its proxy. At last, an example of SOS is achieved to verify the effect of the adapter.

Longlong Lu

2012-09-01

95

Multi-level Clustering Architecture for Wireless Sensor Networks  

Directory of Open Access Journals (Sweden)

Full Text Available Recently wireless sensor networks have received increasing attention from the research community. One of the key design challenges in wireless sensor network is conserving the sensor nodes= energies, so as to maximize their lifetime. Clustering technique has proved to be a fundamental mechanism to increases network lifetime and scalability. This study was proposed a novel distributed clustering approach to organize the sensors in a wireless sensor network into clusters. Based on this algorithm, generate a multi-level clustering architecture in a top-down fashion and observe that the energy consumption decrease with the number of levels in the hierarchy. Numerical analysis was also given on the basis of the result from stochastic geometry.

Yulin He

2006-01-01

96

Advances on Sensor Web for Internet of Things  

Science.gov (United States)

'In much the same way that HTML and HTTP enabled WWW, the Open Geospatial Consortium (OGC) Sensor Web Enablement (SWE), envisioned in 2001 [1] will allow sensor webs to become a reality.'. Due to the large number of sensor manufacturers and differing accompanying protocols, integrating diverse sensors into observation systems is not a simple task. A coherent infrastructure is needed to treat sensors in an interoperable, platform-independent and uniform way. SWE standardizes web service interfaces, sensor descriptions and data encodings as building blocks for a Sensor Web. SWE standards are now mature specifications (version 2.0) with approved OGC compliance test suites and tens of independent implementations. Many earth and space science organizations and government agencies are using the SWE standards to publish and share their sensors and observations. While SWE has been demonstrated very effective for scientific sensors, its complexity and the computational overhead may not be suitable for resource-constrained tiny sensors. In June 2012, a new OGC Standards Working Group (SWG) was formed called the Sensor Web Interface for Internet of Things (SWE-IoT) SWG. This SWG focuses on developing one or more OGC standards for resource-constrained sensors and actuators (e.g., Internet of Things devices) while leveraging the existing OGC SWE standards. In the near future, billions to trillions of small sensors and actuators will be embedded in real- world objects and connected to the Internet facilitating a concept called the Internet of Things (IoT). By populating our environment with real-world sensor-based devices, the IoT is opening the door to exciting possibilities for a variety of application domains, such as environmental monitoring, transportation and logistics, urban informatics, smart cities, as well as personal and social applications. The current SWE-IoT development aims on modeling the IoT components and defining a standard web service that makes the observations captured by IoT devices easily accessible and allows users to task the actuators on the IoT devices. The SWE IoT model links things with sensors and reuses the OGC Observation and Model (O&M) to link sensors with features of interest and observed properties Unlike most SWE standards, the SWE-IoT defines a RESTful web interface for users to perform CRUD (i.e., create, read, update, and delete) functions on resources, including Things, Sensors, Actuators, Observations, Tasks, etc. Inspired by the OASIS Open Data Protocol (OData), the SWE-IoT web service provides the multi-faceted query, which means that users can query from different entity collections and link from one entity to other related entities. This presentation will introduce the latest development of the OGC SWE-IoT standards. Potential applications and implications in Earth and Space science will also be discussed. [1] Mike Botts, Sensor Web Enablement White Paper, Open GIS Consortium, Inc. 2002

Liang, S.; Bermudez, L. E.; Huang, C.; Jazayeri, M.; Khalafbeigi, T.

2013-12-01

97

Sensor architecture and task classification for agricultural vehicles and environments.  

Science.gov (United States)

The long time wish of endowing agricultural vehicles with an increasing degree of autonomy is becoming a reality thanks to two crucial facts: the broad diffusion of global positioning satellite systems and the inexorable progress of computers and electronics. Agricultural vehicles are currently the only self-propelled ground machines commonly integrating commercial automatic navigation systems. Farm equipment manufacturers and satellite-based navigation system providers, in a joint effort, have pushed this technology to unprecedented heights; yet there are many unresolved issues and an unlimited potential still to uncover. The complexity inherent to intelligent vehicles is rooted in the selection and coordination of the optimum sensors, the computer reasoning techniques to process the acquired data, and the resulting control strategies for automatic actuators. The advantageous design of the network of onboard sensors is necessary for the future deployment of advanced agricultural vehicles. This article analyzes a variety of typical environments and situations encountered in agricultural fields, and proposes a sensor architecture especially adapted to cope with them. The strategy proposed groups sensors into four specific subsystems: global localization, feedback control and vehicle pose, non-visual monitoring, and local perception. The designed architecture responds to vital vehicle tasks classified within three layers devoted to safety, operative information, and automatic actuation. The success of this architecture, implemented and tested in various agricultural vehicles over the last decade, rests on its capacity to integrate redundancy and incorporate new technologies in a practical way. PMID:22163522

Rovira-Más, Francisco

2010-01-01

98

On Representative Spaceflight Instrument and Associated Instrument Sensor Web Framework  

Science.gov (United States)

Sensor Web-based adaptation and sharing of space flight mission resources, including those of the Space-Ground and Control-User communication segment, could greatly benefit from utilization of heritage Internet Protocols and devices applied for Spaceflight (SpaceIP). This had been successfully demonstrated by a few recent spaceflight experiments. However, while terrestrial applications of Internet protocols are well developed and understood (mostly due to billions of dollars in investments by the military and industry), the spaceflight application of Internet protocols is still in its infancy. Progress in the developments of SpaceIP-enabled instrument components will largely determine the SpaceIP utilization of those investments and acceptance in years to come. Likewise SpaceIP, the development of commercial real-time and instrument colocated computational resources, data compression and storage, can be enabled on-board a spacecraft and, in turn, support a powerful application to Sensor Web-based design of a spaceflight instrument. Sensor Web-enabled reconfiguration and adaptation of structures for hardware resources and information systems will commence application of Field Programmable Arrays (FPGA) and other aerospace programmable logic devices for what this technology was intended. These are a few obvious potential benefits of Sensor Web technologies for spaceflight applications. However, they are still waiting to be explored. This is because there is a need for a new approach to spaceflight instrumentation in order to make these mature sensor web technologies applicable for spaceflight. In this paper we present an approach in developing related and enabling spaceflight instrument-level technologies based on the new concept of a representative spaceflight Instrument Sensor Web (ISW).

Kizhner, Semion; Patel, Umeshkumar; Vootukuru, Meg

2007-01-01

99

Service-Oriented Architectures and Web Services: Course Tutorial Notes  

CERN Document Server

This document presents a number of quick-step instructions to get started on writing mini-service-oriented web services-based applications using NetBeans 6.5.x, Tomcat 6, GlassFish 2.1, and Java 1.6 primarily in Fedora 9 Linux with user quota restrictions. While the tutorial notes are oriented towards the students taking the SOEN691A course on service-oriented architectures (SOA) at Computer Science and Software Engineering (CSE) Department, Faculty of Engineering and Computer Science (ENCS), other may find some of it useful as well outside of CSE or Concordia. The notes are compiled mostly based on the students' needs and feedback.

Mokhov, Serguei A

2009-01-01

100

Interoperability of unattended ground sensors with an open architecture controller using SensorML  

Science.gov (United States)

Unattended Ground Sensors (UGS) from a wide range of manufacturers have difficulty interoperating with each other and common control and dissemination points. Typically, sensor data is transmitted via RF or wired connections to a central location where the data can be fused together and transmitted further via satellite to a Processing, Exploitation and Dissemination (PED) system. These PED's are charged with analyzing the data to create real time actionable intelligence for the war fighter. However, when several disparate sensors from different manufacturers are used, interoperability problems arise. Therefore, a central UGS controller that accepts data from a wide range of sensors and helps them interoperate is essential. This paper addresses benefits derived from using the Open Geospatial Consortium's (OGC) Sensor Model Language (SensorML) sensor descriptions for an UGS controller. SensorML 1.0 is an approved OGC standard and is one of the major components within the OGC Sensor Web Enablement (SWE) suite of standards. SensorML provides standard models and an XML encoding for describing any process, including the process of measurement by sensors. By incorporating SensorML, an UGS controller can accept data from various sensors from different manufacturers, and interpret that data with the SensorML descriptions to allow the controller to take programmed actions and interoperate between sensors. Furthermore, SensorML can be used to translate the native sensor formats once the original data has been transmitted to the PED. Therefore, this makes a SensorML enabled UGS controller an extremely powerful tool that provides situational awareness by combining multiple sensors to form a single common operational picture (COP).

Chambers, Jon; Fairgrieve, Scott

2010-04-01

 
 
 
 
101

Digital Pixel Sensor Array with Logarithmic Delta-Sigma Architecture  

Directory of Open Access Journals (Sweden)

Full Text Available Like the human eye, logarithmic image sensors achieve wide dynamic range easily at video rates, but, unlike the human eye, they suffer from low peak signal-to-noise-and-distortion ratios (PSNDRs. To improve the PSNDR, we propose integrating a delta-sigma analog-to-digital converter (ADC in each pixel. An image sensor employing this architecture is designed, built and tested in 0.18 micron complementary metal-oxide-semiconductor (CMOS technology. It achieves a PSNDR better than state-of-the-art logarithmic sensors and comparable to the human eye. As the approach concerns an array of many ADCs, we use a small-area low-power delta-sigma design. For scalability, each pixel has its own decimator. The prototype is compared to a variety of other image sensors, linear and nonlinear, from industry and academia.

Jing Li

2013-08-01

102

Digital pixel sensor array with logarithmic delta-sigma architecture.  

Science.gov (United States)

Like the human eye, logarithmic image sensors achieve wide dynamic range easily at video rates, but, unlike the human eye, they suffer from low peak signal-to-noise-and-distortion ratios (PSNDRs). To improve the PSNDR, we propose integrating a delta-sigma analog-to-digital converter (ADC) in each pixel. An image sensor employing this architecture is designed, built and tested in 0.18 micron complementary metal-oxide-semiconductor (CMOS) technology. It achieves a PSNDR better than state-of-the-art logarithmic sensors and comparable to the human eye. As the approach concerns an array of many ADCs, we use a small-area low-power delta-sigma design. For scalability, each pixel has its own decimator. The prototype is compared to a variety of other image sensors, linear and nonlinear, from industry and academia. PMID:23959239

Mahmoodi, Alireza; Li, Jing; Joseph, Dileepan

2013-01-01

103

Architecture for Integrating Desktop and Web 2.0 Data Management  

Digital Repository Infrastructure Vision for European Research (DRIVER)

A new form of personal information fragmentation is arising due to the rapid growth in Web 2.0 applications and their use for the management of data typically associated with desktop applications. We propose a data management architecture that allows data to be shared between desktop and Web 2.0 applications. The architecture supports a separation of concerns between the management of personal data and its publication on the Web to social networks.

Leone, Stefania; Grossniklaus, Michael; Norrie, Moira C.

2008-01-01

104

Software Architecture of Sensor Data Distribution In Planetary Exploration  

Science.gov (United States)

Data from mobile and stationary sensors will be vital in planetary surface exploration. The distribution and collection of sensor data in an ad-hoc wireless network presents a challenge. Irregular terrain, mobile nodes, new associations with access points and repeaters with stronger signals as the network reconfigures to adapt to new conditions, signal fade and hardware failures can cause: a) Data errors; b) Out of sequence packets; c) Duplicate packets; and d) Drop out periods (when node is not connected). To mitigate the effects of these impairments, a robust and reliable software architecture must be implemented. This architecture must also be tolerant of communications outages. This paper describes such a robust and reliable software infrastructure that meets the challenges of a distributed ad hoc network in a difficult environment and presents the results of actual field experiments testing the principles and actual code developed.

Lee, Charles; Alena, Richard; Stone, Thom; Ossenfort, John; Walker, Ed; Notario, Hugo

2006-01-01

105

An Architecture of Mobile Web 2.0 Context-aware Applications in Ubiquitous Web  

Directory of Open Access Journals (Sweden)

Full Text Available The rapid development of the wireless communication technologies, including wireless sensors, intelligent mobile devices, and communication protocols, has led to diverse mobile devices of accessing various context-aware systems. Existing context-aware systems only focus on characterize the situation of an entity to exhibit the advantage of contextual information association. The contextual information can represent semantic implications to provide decidable reasoning services, but it has no mechanism to facilitating the interoperability and reusability among heterogeneous context-aware systems and various mobile devices. This study addresses these issues developing a Multi-layer Context Framework (MCF that integrates Web 2.0 technologies into context-aware system for supporting ubiquitous mobile environment. The proposed MCF includes context sensor layer, context information layer, context service layer, context representation layer, mobile device layer, and context-aware mobile Web 2.0 application layer. To demonstrate the feasibility of the infrastructure, a Mobile Web 2.0-based Context-aware Attendance Monitoring System (MWCAMS is implemented with ZigBee devices to provide continuous and context-aware monitoring of employee attendance status.

I-Ching Hsu

2011-04-01

106

An Energy Driven Architecture for Wireless Sensor Networks  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Most wireless sensor networks operate with very limited energy sources-their batteries, and hence their usefulness in real life applications is severely constrained. The challenging issues are how to optimize the use of their energy or to harvest their own energy in order to lengthen their lives for wider classes of application. Tackling these important issues requires a robust architecture that takes into account the energy consumption level of functional constituents and t...

Hoang, Doan B.; Kamyabpour, Najmeh

2012-01-01

107

Architecture for service-oriented WebGIS in the mode of multilevel multilayer organizing  

Science.gov (United States)

Service-oriented WebGIS is becoming a new trend of WebGIS. Under this schema, GIS data and operations are enveloped into self-organized as well as self-described GIS web services. Via flexibly assembling theses web services, GIS applications can be designed and implemented. Based on such, the bottleneck in spatial data sharing and GIS operations can be widened to a certain extent. In this article, architecture for service-oriented WebGIS in the mode of Multilevel-multilayer Organizing was focused on, and the hierarchical architecture for GIS web services, multi-level query for GIS Web services as well as functions of intelligent manager were presented and demonstrating. In a case study, a land use planning management information system for Yubei district, Chongqing city, had been developed based on web service technique to demonstrate proposed feasibility.

Li, Feixue; Li, Manchun; Liang, Jian

2007-06-01

108

Architecture for Improving Terrestrial Logistics Based on the Web of Things  

Directory of Open Access Journals (Sweden)

Full Text Available Technological advances for improving supply chain efficiency present three key challenges for managing goods: tracking, tracing and monitoring (TTM, in order to satisfy the requirements for products such as perishable goods where the European Legislations requires them to ship within a prescribed temperature range to ensure freshness and suitability for consumption. The proposed system integrates RFID for tracking and tracing through a distributed architecture developed for heavy goods vehicles, and the sensors embedded in the SunSPOT platform for monitoring the goods transported based on the concept of the Internet of Things. This paper presents how the Internet of Things is integrated for improving terrestrial logistics offering a comprehensive and flexible architecture, with high scalability, according to the specific needs for reaching an item-level continuous monitoring solution. The major contribution from this work is the optimization of the Embedded Web Services based on RESTful (Web of Things for the access to TTM services at any time during the transportation of goods. Specifically, it has been extended the monitoring patterns such as observe and blockwise transfer for the requirements from the continuous conditional monitoring, and for the transfer of full inventories and partial ones based on conditional queries. In definitive, this work presents an evolution of the previous TTM solutions, which were limited to trailer identification and environment monitoring, to a solution which is able to provide an exhaustive item-level monitoring, required for several use cases. This exhaustive monitoring has required new communication capabilities through the Web of Things, which has been optimized with the use and improvement of a set of communications patterns.

Antonio Skarmeta

2012-05-01

109

DSP Architecture for Wireless Sensor Nodes Using VLSI Technique  

Directory of Open Access Journals (Sweden)

Full Text Available Radio communication exhibits the highest energy consumption in wireless sensor nodes. Given their limited energy supply from batteries or scavenging, these nodes must trade data communication for on-the-node computation. Currently, they are designed around off-the-shelf low-power microcontrollers. But by employing a more appropriate processing element, the energy consumption can be significantly reduced. This paper describes the design and implementation of the newly proposed folded-tree architecture for on-the-node data processing in wireless sensor networks, using parallel prefix operations and data locality in hardware. Measurements of the silicon implementation show an improvement of 10–20× in terms of energy as compared to traditional modern micro-controllers found in sensor nodes.

R.Ragumadhavan

2014-02-01

110

Digital Architecture for a Trace Gas Sensor Platform  

Science.gov (United States)

A digital architecture has been implemented for a trace gas sensor platform, as a companion to standard analog control electronics, which accommodates optical absorption whose fractional absorbance equivalent would result in excess error if assumed to be linear. In cases where the absorption (1-transmission) is not equivalent to the fractional absorbance within a few percent error, it is necessary to accommodate the actual measured absorption while reporting the measured concentration of a target analyte with reasonable accuracy. This requires incorporation of programmable intelligence into the sensor platform so that flexible interpretation of the acquired data may be accomplished. Several different digital component architectures were tested and implemented. Commercial off-the-shelf digital electronics including data acquisition cards (DAQs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), and microcontrollers have been used to achieve the desired outcome. The most completely integrated architecture achieved during the project used the CPLD along with a microcontroller. The CPLD provides the initial digital demodulation of the raw sensor signal, and then communicates over a parallel communications interface with a microcontroller. The microcontroller analyzes the digital signal from the CPLD, and applies a non-linear correction obtained through extensive data analysis at the various relevant EVA operating pressures. The microcontroller then presents the quantitatively accurate carbon dioxide partial pressure regardless of optical density. This technique could extend the linear dynamic range of typical absorption spectrometers, particularly those whose low end noise equivalent absorbance is below one-part-in-100,000. In the EVA application, it allows introduction of a path-length-enhancing architecture whose optical interference effects are well understood and quantified without sacrificing the dynamic range that allows quantitative detection at the higher carbon dioxide partial pressures. The digital components are compact and allow reasonably complete integration with separately developed analog control electronics without sacrificing size, mass, or power draw.

Gonzales, Paula; Casias, Miguel; Vakhtin, Andrei; Pilgrim, Jeffrey

2012-01-01

111

Distributed event-driven architectures for evolutionary sensor fusion  

Science.gov (United States)

The next decade will require the development of complex sensor systems that integrate data from a large number of sensor elements. Such systems will play important roles in a wide variety of industrial and defense systems, as the fusion of multiple sources of information is crucial to sensor operation in noisy environments, and in complex decision making. The arrival of ubiquitous processing elements is one requirement for the development of such systems; however, the ability to connect and integrate these elements at the logical level is the more limiting aspect of their development. Furthermore, it is unlikely that such systems can be developed in a single linear process. It is much more probable that such systems will need to be evolved over time, perhaps a substantial period of time, and as result the ability to logically interconnect heterogeneous elements in an evolutionary manner will be of great importance. This paper outlines some approaches to this problem based on the distributed object-computing model as introduced in the OMG CORBA. It is our belief that this technology is maturing to the point that it could form the foundations for a sensor architecture that would support the evolutionary development of complex sensor networks.

Lake, Ron T.

1998-03-01

112

A Web Services based Approach for Resource-Constrained Wireless Sensor Networks  

Directory of Open Access Journals (Sweden)

Full Text Available The large diffusion of Wireless Sensor Networks (WSNs in our contemporary life with their numerous applications has led to a huge heterogeneity. This heterogeneity makes the possibility of discovering and collecting data from the wireless sensors more and more difficult. Indeed, WSNs are currently developed around different communities of sensor and user types, with each community typically relying on its own system, metadata semantics, data format and software. Therefore, the ability to discover and utilize a new sensor asset is typically hindered by incompatible services and encodings which can cause interoperability between different sensor nodes within the same WSN. Service-Oriented-Architecture (SOA is one of the key paradigms that enables the deployment of services at large-scale over the Internet domain and its integration with WSNs could open new pathways for novel applications and research. Despite the need to integrate SOA with WSNs, only handful efforts are underway to achieve the goal. In this paper, we tackle integration of SOA with WSNs by proposing a Lightweight Representational State Transfer (REST-based Web Services approach to treat sensors in an interoperable, platform-independent and uniform way.

Sana Baccar

2012-05-01

113

RESTFul based heterogeneous Geoprocessing workflow interoperation for Sensor Web Service  

Science.gov (United States)

Advanced sensors on board satellites offer detailed Earth observations. A workflow is one approach for designing, implementing and constructing a flexible and live link between these sensors' resources and users. It can coordinate, organize and aggregate the distributed sensor Web services to meet the requirement of a complex Earth observation scenario. A RESTFul based workflow interoperation method is proposed to integrate heterogeneous workflows into an interoperable unit. The Atom protocols are applied to describe and manage workflow resources. The XML Process Definition Language (XPDL) and Business Process Execution Language (BPEL) workflow standards are applied to structure a workflow that accesses sensor information and one that processes it separately. Then, a scenario for nitrogen dioxide (NO2) from a volcanic eruption is used to investigate the feasibility of the proposed method. The RESTFul based workflows interoperation system can describe, publish, discover, access and coordinate heterogeneous Geoprocessing workflows.

Yang, Chao; Chen, Nengcheng; Di, Liping

2012-10-01

114

The ARCOMEM Architecture for Social- and Semantic-Driven Web Archiving  

Directory of Open Access Journals (Sweden)

Full Text Available The constantly growing amount ofWeb content and the success of the SocialWeb lead to increasing needs for Web archiving. These needs go beyond the pure preservationo of Web pages. Web archives are turning into “community memories” that aim at building a better understanding of the public view on, e.g., celebrities, court decisions and other events. Due to the size of the Web, the traditional “collect-all” strategy is in many cases not the best method to build Web archives. In this paper, we present the ARCOMEM (From Future Internet 2014, 6 689 Collect-All Archives to Community Memories architecture and implementation that uses semantic information, such as entities, topics and events, complemented with information from the Social Web to guide a novel Web crawler. The resulting archives are automatically enriched with semantic meta-information to ease the access and allow retrieval based on conditions that involve high-level concepts.

Thomas Risse

2014-11-01

115

A Single-Transistor Active Pixel CMOS Image Sensor Architecture  

International Nuclear Information System (INIS)

A single-transistor CMOS active pixel image sensor (1 T CMOS APS) architecture is proposed. By switching the photosensing pinned diode, resetting and selecting can be achieved by diode pull-up and capacitive coupling pull-down of the source follower. Thus, the reset and selected transistors can be removed. In addition, the reset and selected signal lines can be shared to reduce the metal signal line, leading to a very high fill factor. The pixel design and operation principles are discussed in detail. The functionality of the proposed 1T CMOS APS architecture has been experimentally verified using a fabricated chip in a standard 0.35 ?m CMOS AMIS technology

116

Semantic Web-Driven LMS Architecture towards a Holistic Learning Process Model Focused on Personalization  

Science.gov (United States)

A comprehensive presentation is here made on the modular architecture of an e-learning platform with a distinctive emphasis on content personalization, combining advantages from semantic web technology, collaborative filtering and recommendation systems. Modules of this architecture handle information about both the domain-specific didactic…

Kerkiri, Tania

2010-01-01

117

Comparison of the Rest Architectural Style with Soap in Implementation of Modern Web Services  

Directory of Open Access Journals (Sweden)

Full Text Available One of the most relevant steps in the development of an information system during implementation of web services is moving the existing program functionality onto the web. Although web services have been advancing together with software, implementation requires special attention. Accessible options allow organisations to search for alternatives that would suit their needs, i.e. would be cheaper and more effective as well as possibly easier and faster to implement. The paper aims to compare a standard method for creation of web services with another architectural style for implementation of web services, which is getting more widely used.Article in Lithuanian

K?stutis Stankevi?ius

2013-05-01

118

Sensor-based architecture for medical imaging workflow analysis.  

Science.gov (United States)

The growing use of computer systems in medical institutions has been generating a tremendous quantity of data. While these data have a critical role in assisting physicians in the clinical practice, the information that can be extracted goes far beyond this utilization. This article proposes a platform capable of assembling multiple data sources within a medical imaging laboratory, through a network of intelligent sensors. The proposed integration framework follows a SOA hybrid architecture based on an information sensor network, capable of collecting information from several sources in medical imaging laboratories. Currently, the system supports three types of sensors: DICOM repository meta-data, network workflows and examination reports. Each sensor is responsible for converting unstructured information from data sources into a common format that will then be semantically indexed in the framework engine. The platform was deployed in the Cardiology department of a central hospital, allowing identification of processes' characteristics and users' behaviours that were unknown before the utilization of this solution. PMID:24957389

Silva, Luís A Bastião; Campos, Samuel; Costa, Carlos; Oliveira, José Luis

2014-08-01

119

An architecture for "Web Of Things" using SOCKS protocol based IPv6/IPv4 gatewaying for heterogeneous communication  

CERN Document Server

"Web Of Things" evolved from "Internet Of Things". Lot of research has been done in designing architecture for "Web Of Things". Two main architectures are Smart gateway based architecture and embedded Web Server based architecture. These architectures address some of the basic and essential issues relating to Service Oriented Architecture for "Web Of Things". Taking into consideration the period of coexistence of IPv4 and IPv6 we propose an architecture using SOCKS protocol based IPv6/IPv4 gatewaying and refinements which facilitates smooth heterogeneous communications between the IPv6 and IPv4 enabled embedded nodes and can potentially be used to prevent security threats like Denial-of-Service (DoS) attacks on embedded devices attached to the web and increase its performance. Our architecture provides a way for caching responses from device and thereby increasing its efficiency and performance and yielding quick response times.

Patnaikuni, P Shrinivasan R

2011-01-01

120

Overview Of Tenet: Architecture For Tiered Sensor Networks  

Directory of Open Access Journals (Sweden)

Full Text Available Most sensor network research and software design has been guided by an architectural principle that permits multi-node data fusion on small-form-factor, resource-poor nodes, or motes. We argue that this principle leads to fragile and unmanageable systems and explore an alternative. The Tenet architecture is motivated by the observation that future large-scale sensor network deployments will be tiered, consisting of motes in the lower tier and masters, relatively unconstrained 32-bit platform nodes, in the upper tier. Masters provide increased network capacity. Tenet constrains multimode fusion to the master tier while allowing motes to process locallygeneratedsensor data. This simplifies application development and allows mote-tier software to be reused. Applications running on masters task motes by composing task descriptions from a novel tasklet library. OurTenet implementation also contains a robust and scalable networking subsystem for disseminating tasks and reliably delivering responses. We show that a Tenet pursuit-evasion application exhibits performancecomparable to a mote-native implementation while being considerably more compact.

MANJU PRIYA .S

2011-01-01

 
 
 
 
121

Architecture of A Scalable Dynamic Parallel WebCrawler with High Speed Downloadable Capability for a Web Search Engine  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Today World Wide Web (WWW) has become a huge ocean of information and it is growing in size everyday. Downloading even a fraction of this mammoth data is like sailing through a huge ocean and it is a challenging task indeed. In order to download a large portion of data from WWW, it has become absolutely essential to make the crawling process parallel. In this paper we offer the architecture of a dynamic parallel Web crawler, christened as "WEB-SAILOR," which presents a scala...

Mukhopadhyay, Debajyoti; Mukherjee, Sajal; Ghosh, Soumya; Kar, Saheli; Kim, Young-chon

2011-01-01

122

Sensor Web Approach For Next-Generation Research Aircraft Platform Data Systems  

Science.gov (United States)

A NASA project creating sensor web tools has resulted in systems which provide network telemetry for airborne experiments, while also providing traditional data system functions. The Research Environment for Vehicle-Embedded Analysis on Linux (REVEAL) software and hardware has now been tested on many Airborne Science campaigns and on several aircraft platforms, both manned and UAV, with participants across the Internet monitoring and contributing to the success of each mission. The software is a self-configuring, self-documenting framework based on open-standards XML which can wrap any schema such as SensorML to automatically generate metadata. Experimenters can participate by providing real-time instrument data in whatever format is most convenient to them. Buffering middleware enables efficient data distribution across the network, where applications can add value and create live displays, despite very limited air-ground bandwidth for telemetering the merged data streams. The system architecture is described, and plans are described to replace or install systems on several NASA Airborne Science platform aircraft. These new systems will be transparent to legacy instruments while enabling sensor web and telepresence applications, and provide a common interface across the platforms.

Sorenson, C.; Freudinger, L.; Yarbrough, S.

2006-12-01

123

Architecture of A Scalable Dynamic Parallel WebCrawler with High Speed Downloadable Capability for a Web Search Engine  

CERN Document Server

Today World Wide Web (WWW) has become a huge ocean of information and it is growing in size everyday. Downloading even a fraction of this mammoth data is like sailing through a huge ocean and it is a challenging task indeed. In order to download a large portion of data from WWW, it has become absolutely essential to make the crawling process parallel. In this paper we offer the architecture of a dynamic parallel Web crawler, christened as "WEB-SAILOR," which presents a scalable approach based on Client-Server model to speed up the download process on behalf of a Web Search Engine in a distributed Domain-set specific environment. WEB-SAILOR removes the possibility of overlapping of downloaded documents by multiple crawlers without even incurring the cost of communication overhead among several parallel "client" crawling processes.

Mukhopadhyay, Debajyoti; Ghosh, Soumya; Kar, Saheli; Kim, Young-Chon

2011-01-01

124

Architecture for large-scale automatic web accessibility evaluation based on the UWEM methodology  

DEFF Research Database (Denmark)

The European Internet Accessibility project (EIAO) has developed an Observatory for performing large scale automatic web accessibility evaluations of public sector web sites in Europe. The architecture includes a distributed web crawler that crawls web sites for links until either a given budget of web pages have been identified or the web site has been crawled exhaustively. Subsequently, a uniform random subset of the crawled web pages is sampled and sent for accessibility evaluation and the evaluation results are stored in a Resource Description Format (RDF) database that is later loaded into the EIAO data warehouse using an Extract-Transform-Load (ETL) tool. The aggregated indicator results in the data warehouse are finally presented in a Plone based online reporting tool. This paper describes the final version of the EIAO architecture and outlines some of the technical and architectural challenges that the project faced and the solutions developed towards building a system capable of regular large-scale accessibility evaluations with sufficient capacity and stability. It also outlines some possible future architectural improvements.

Ulltveit-Moe, Nils; Olsen, Morten Goodwin

2008-01-01

125

Development of a Dynamic Web Mapping Service for Vegetation Productivity Using Earth Observation and in situ Sensors in a Sensor Web Based Approach  

Directory of Open Access Journals (Sweden)

Full Text Available This paper describes the development of a sensor web based approach which combines earth observation and in situ sensor data to derive typical information offered by a dynamic web mapping service (WMS. A prototype has been developed which provides daily maps of vegetation productivity for the Netherlands with a spatial resolution of 250 m. Daily available MODIS surface reflectance products and meteorological parameters obtained through a Sensor Observation Service (SOS were used as input for a vegetation productivity model. This paper presents the vegetation productivity model, the sensor data sources and the implementation of the automated processing facility. Finally, an evaluation is made of the opportunities and limitations of sensor web based approaches for the development of web services which combine both satellite and in situ sensor sources.

Sytze de Bruin

2009-03-01

126

An Architecture for “Web of Things” Using SOCKS Protocol Based IPv6/IPv4 Gatewaying for Heterogeneous Communication  

Directory of Open Access Journals (Sweden)

Full Text Available “Web of Things” evolved from “Internet of Things”. Lot of research has been done in designing architecture for “Web of Things”. Two main architectures are Smart gateway based architecture and embedded Web Server based architectture. These architectures address some of the basic and essential issues relating to Service Oriented Architecture for “Web of Things”. Taking into consideration the period of coexistence of IPv4 and IPv6 we propose an architecture using SOCKS protocol based IPv6/IPv4 gatewaying and refinements which facilitates smooth heterogeneous communications between the IPv6 and IPv4 enabled embedded nodes and can potentially be used to prevent security threats like Denial-of-Service (DoS attacks on embedded devices attached to the web and increase its performance. Our architecture provides a way for caching responses from device and thereby increasing its efficiency and performance and yielding quick response times.

P. Shrinivasan R. Patnaikuni

2012-01-01

127

Development of an Web Service Architecture for Enterprise Application Integration  

Energy Technology Data Exchange (ETDEWEB)

The purpose of Enterprise Application Integration (EAI) is to enable the interoperability between two or more enterprise software systems. These systems, for example, can be an Enterprise Resource Planning (ERP) system, an Enterprise Asset Management (EAM) system or a Condition Monitoring system. Traditional EAI approach, based on point-to-point connection, is expensive, vendor specific with limited modules and restricted interoperability with other ERPs and applications. To overcome these drawbacks, the Web Service based EAI has emerged. It allows the integration without point to point linking and with less costs. Many approaches of Web service based EAI are combined with ORACLE, SAP, PeopleSoft, WebSphere, SIEBEL etc. as a system integration platform. The approach still has the restriction that only predefined clients can access the services. This means clients must know exactly the protocol for calling the services and if they don't have the access information they never can get the services. This is because these Web services are based on syntactic service description. In this paper, a semantic based EAI approach, that allows the uninformed clients to access the services, is introduced. The semantic EAI is designed with the Web services that have semantic service descriptions. The Semantic Web Services(SWS) are described in Web Ontology Language for Services(OWL-S), a semantic service ontology language, and advertised in Universal Description, Discovery and Integration (UDDI). Clients find desired services through the UDDI and get services from service providers through Web Service Description Language(WSDL)

Kim, Ji-Hyeon; Jung, Jae-Cheon; Chang, Young-Woo; Chang, Hoon-Seon; Kim, Jae-Cheol; Kim, Hang-Bae [Korea Power Engineering Company, Daejeon (Korea, Republic of); Kim, Kyu-Ho; Lee, Dong-Chul [Korea Electric Power Data Network, Daejeon (Korea, Republic of)

2007-07-01

128

Incorporating Quality Control Information in the Sensor Web  

Science.gov (United States)

The rapid development of sensing technologies had led to the creation of large amounts of heterogeneous environmental observations. The Sensor Web provides a wider access to sensors and observations via common protocols and specifications. Observations typically go through several levels of quality control, and aggregation before they are made available to end-users. Raw data are usually inspected, and related quality flags are assigned. Data are gap-filled, and errors are removed. New data series may also be derived from one or more corrected data sets. Until now, it is unclear how these kinds of information can be captured in the Sensor Web Enablement (SWE) framework. Apart from the quality measures (e.g., accuracy, precision, tolerance, or confidence), the levels of observational series, the changes applied, and the methods involved must be specified. It is important that this kind of quality control information is well described and communicated to end-users to allow for a better usage and interpretation of data products. In this paper, we describe how quality control information can be incorporated into the SWE framework. Concerning this, first, we introduce the TERENO (TERrestrial ENvironmental Observatories), an initiative funded by the large research infrastructure program of the Helmholtz Association in Germany. The main goal of the initiative is to facilitate the study of long-term effects of climate and land use changes. The TERENO Online Data RepOsitORry (TEODOOR) is a software infrastructure that supports acquisition, provision, and management of observations within TERENO via SWE specifications and several other OGC web services. Next, we specify changes made to the existing observational data model to incorporate quality control information. Here, we describe the underlying TERENO data policy in terms of provision and maintenance issues. We present data levels, and their implementation within TEODOOR. The data levels are adapted from those used by other similar systems such as CUAHSI, EarthScope and WMO. Finally, we outline recommendations for future work.

Devaraju, Anusuriya; Kunkel, Ralf; Bogena, Heye

2013-04-01

129

NASA SensorWeb and OGC Standards for Disaster Management  

Science.gov (United States)

I. Goal: Enable user to cost-effectively find and create customized data products to help manage disasters; a) On-demand; b) Low cost and non-specialized tools such as Google Earth and browsers; c) Access via open network but with sufficient security. II. Use standards to interface various sensors and resultant data: a) Wrap sensors in Open Geospatial Consortium (OGC) standards; b) Wrap data processing algorithms and servers with OGC standards c) Use standardized workflows to orchestrate and script the creation of these data; products. III. Target Web 2.0 mass market: a) Make it simple and easy to use; b) Leverage new capabilities and tools that are emerging; c) Improve speed and responsiveness.

Mandl, Dan

2010-01-01

130

The Global Sensor Web: A Platform for Citizen Science (Invited)  

Science.gov (United States)

The Global Sensor Web (GSW) is an effort to provide an infrastructure for the collection, sharing and visualizing sensor data from around the world. Over the past three years the GSW has been developed and tested as a standardized platform for citizen science. The most developed of the citizen science projects built onto the GSW has been Distributed Electronic Cosmic-ray Observatory (DECO), which is an Android application designed to harness a global network of mobile devices, to detect the origin and behavior of the cosmic radiation. Other projects which can be readily built on top of GSW as a platform are also discussed. A cosmic-ray track candidate captured on a cell phone camera.

Simons, A. L.

2013-12-01

131

Solving Web-based Applications Architectural Problems in the Cloud: The Way Forward  

Directory of Open Access Journals (Sweden)

Full Text Available Highly-available and scalable software systems can be a complex and expensive proposition. Traditional scalable software architectures have not only needed to implement complex solutions to ensure high levels of reliability, but have also required an accurate forecast of traffic to provide a high level of customer service. This traditional software architecture is built around a common three-tier web application model that separates the architecture into presentation, business logic and database layers. This architecture has already been designed to scale out by adding additional hosts at these layers and has built-in performance, failover and availability features. Even with all these developments in architectural designs, some software still lacks in scalability, reliability and efficiency. This paper therefore examines the shortfalls of traditional software architectural problems with a view to addressing them using the cloud computing approach.

Philip Achimugu

2012-05-01

132

Sensor Webs: Autonomous Rapid Response to Monitor Transient Science Events  

Science.gov (United States)

To better understand how physical phenomena, such as volcanic eruptions, evolve over time, multiple sensor observations over the duration of the event are required. Using sensor web approaches that integrate original detections by in-situ sensors and global-coverage, lower-resolution, on-orbit assets with automated rapid response observations from high resolution sensors, more observations of significant events can be made with increased temporal, spatial, and spectral resolution. This paper describes experiments using Earth Observing 1 (EO-1) along with other space and ground assets to implement progressive mission autonomy to identify, locate and image with high resolution instruments phenomena such as wildfires, volcanoes, floods and ice breakup. The software that plans, schedules and controls the various satellite assets are used to form ad hoc constellations which enable collaborative autonomous image collections triggered by transient phenomena. This software is both flight and ground based and works in concert to run all of the required assets cohesively and includes software that is model-based, artificial intelligence software.

Mandl, Dan; Grosvenor, Sandra; Frye, Stu; Sherwood, Robert; Chien, Steve; Davies, Ashley; Cichy, Ben; Ingram, Mary Ann; Langley, John; Miranda, Felix

2005-01-01

133

Web-Based Interface for Command and Control of Network Sensors  

Science.gov (United States)

This software allows for the visualization and control of a network of sensors through a Web browser interface. It is currently being deployed for a network of sensors monitoring Mt. Saint Helen s volcano; however, this innovation is generic enough that it can be deployed for any type of sensor Web. From this interface, the user is able to fully control and monitor the sensor Web. This includes, but is not limited to, sending "test" commands to individual sensors in the network, monitoring for real-world events, and reacting to those events

Wallick, Michael N.; Doubleday, Joshua R.; Shams, Khawaja S.

2010-01-01

134

A survey on architectures, protocols, applications, and management in wireless sensor networks  

Directory of Open Access Journals (Sweden)

Full Text Available With the recent technological advances in wireless communications, integrated digital circuits, and micro electro mechanical systems (MEMS; development of wireless sensor networks has been enabled and become dramatically feasible. Wireless sensor networks (WSNs are large networks made of a numerous number of sensor nodes with sensing, computation, and wireless communications capabilities. Many various routing, power management, and data dissemination protocols have been designed for wireless sensor networks (WSNs dependent on both the network architecture and the applications that it is designed for. In this paper, we present the state of the art of wireless sensor networks’ architecture and design features. Also, in this paper, we introduce recent work on routing protocols for WSNs and their design goals and challenges. Also, an overview of the application that WSNs assist in is presented. Finally, several open research questions of wireless sensor networks management and issues are suggested and put forward.   Keywords: application, architecture, management, protocol, wireless sensor network.

Samira Kalantary

2014-01-01

135

Development of an Web Service Architecture for Enterprise Application Integration  

International Nuclear Information System (INIS)

The purpose of Enterprise Application Integration (EAI) is to enable the interoperability between two or more enterprise software systems. These systems, for example, can be an Enterprise Resource Planning (ERP) system, an Enterprise Asset Management (EAM) system or a Condition Monitoring system. Traditional EAI approach, based on point-to-point connection, is expensive, vendor specific with limited modules and restricted interoperability with other ERPs and applications. To overcome these drawbacks, the Web Service based EAI has emerged. It allows the integration without point to point linking and with less costs. Many approaches of Web service based EAI are combined with ORACLE, SAP, PeopleSoft, WebSphere, SIEBEL etc. as a system integration platform. The approach still has the restriction that only predefined clients can access the services. This means clients must know exactly the protocol for calling the services and if they don't have the access information they never can get the services. This is because these Web services are based on syntactic service description. In this paper, a semantic based EAI approach, that allows the uninformed clients to access the services, is introduced. The semantic EAI is designed with the Web services that have semantic service descriptions. The Semantic Web Services(SWS) are described in Web Ontology Language for Services(OWL-S), a semantic service ontology language, and advertised in Universal Description, Discovery and Integrniversal Description, Discovery and Integration (UDDI). Clients find desired services through the UDDI and get services from service providers through Web Service Description Language(WSDL)

136

Web Service Clients on Mobile Android Devices : A Study on Architectural Alternatives and Client Performance  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper studies Android, a new open source software stack initiated by Google, and the possibilities of developing a mobile client for MPower, a service oriented architecture platform based upon SOAP messaging. The study focuses on the architectural alternatives, their impacts on the mobile client application, Android’s performance on SOAP messaging, and how Web services’ design can be optimized to give well performing Android clients. The results from this study shows how diff...

Knutsen, Johannes

2009-01-01

137

Extended Architecture of Web Crawler on Enhancement in Web Crawler using Weighted Page Rank Algorithm based on VOL  

Directory of Open Access Journals (Sweden)

Full Text Available As the World Wide Web is growing rapidly day by day, the number of web pages is increasing into millions and trillions around the world. To make searching much easier for users, search engines came into existence. Web search engines are used to find specific information on the World Wide Web. Without search engines, it would be almost impossible for us to locate anything on the Web unless or until we know a specific URL address. Every search engine maintains a central repository or databases of HTML documents in indexed form. Whenever a user query comes, searching is performed within that database of indexed web pages. The size of repository of every search engine can’t accommodate each and every page available on the WWW. So it is desired that only the most relevant and important pages are stored in the database to increase the efficiency of search engines. This database of HTML documents is maintained by special software called “Crawler”. A Crawler is software that traverses the web and downloads web pages. Web Crawlers are also known as “Spiders”, “Robots”, “Bots”, “Agents” and “Automatic Harvesters / Indexers” etc. Broad search engines as well as many more specialized search tools rely on web crawlers to acquire large collections of pages for indexing and analysis. Since the Web is a distributed, dynamic and rapidly growing information resource, a crawler cannot download all pages. It is almost impossible for crawlers to crawl the whole web pages from World Wide Web. In today’s dynamic world, Crawlers crawls only fraction of web pages from World Wide Web. So a crawler should observe that the fraction of pages crawled must be most relevant and the most important ones, not just random pages. The crawler is an important module of a search engine. The quality of a crawler directly affects the searching quality of search engines. In our Work, we propose an extended architecture of crawler of search engine, to crawl only relevant and important pages from WWW, which will lead to reduced sever overheads. With our proposed architecture we will also be optimizing the crawled data by removing least or never browsed pages data. The crawler needs a very large memory space of database for storing page content etc, by not storing irrelevant and unimportant pages and removing never accessed pages, we will be saving a lot of memory space that will eventually speed up the searches (queries from the database. In our approach, we propose to use Weighted page Rank based on visits of links algorithm to sort the search results, which will reduce the search space for users, by providing mostly visited pages links on the top of search results list. We present web crawler architecture of the system and describe efficient techniques for achieving high performance. The dynamic nature of the WWW makes it a challenge to ?nd quality information. Intelligent crawlers can complement the power of search engines to meet this challenge.

Sachin Gupta

2014-07-01

138

Web Based System Architecture for Long Pulse Remote Experimentation  

International Nuclear Information System (INIS)

INDRA is the first Information Technology company in Spain and it presents here, through a series of transparencies, its own approach for the remote experimentation architecture for long pulses (REAL). All the architecture is based on Java-2 platform standards and REAL is a totally open architecture. By itself REAL offers significant advantages: -) access authentication and authorization under multiple security implementations, -) local or remote network access: LAN, WAN, VPN..., -) on-line access to acquisition systems for monitoring and configuration, -) scalability, flexibility, robustness, platform independence,.... The BeansNet implementation of REAL gives additional good things such as: -) easy implementation, -) graphical tool for service composition and configuration, -) availability and hot-swap (no need of stopping or restarting services after update or remodeling, and -) INDRA support. The implementation of BeansNet at the TJ-2 stellarator at Ciemat is presented. This document is made of the presentation transparencies. (A.C.)

139

FAST REAL TIME ANALYSIS OF WEB SERVER MASSIVE LOG FILES USING AN IMPROVED WEB MINING ARCHITECTURE  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The web has played a vital role to detect the information and finding the reasons to organize a system. As the web sites were increased, the web log files also increased based on the web searching. Our challenge and the task are to reduce the log files and classify the best results to reach the task which we used. Aimed to overcome the deficiency of abundant data to web mining, the study proposed a path extraction using Euclidean Distance based algorithm with a sequential pattern clustering m...

Hussain Mohammad Abu-Dalbouh

2013-01-01

140

Text Mining-Based Semantic Web Architecture (TMSWA for e-Learning Systems  

Directory of Open Access Journals (Sweden)

Full Text Available This paper highlights semantic web techniques and proposes architecture for e-Learning-based systems for the academic portal. Text mining is used with the proposed model for better processing of unstructured data available in XML and RDF formats. An algorithm will be used to support building a web retrieval system to extract the hidden knowledge for the semantic web by ontologies for e-learning items to classify and find the relationships between the leaning items via the academic portal.

Hamad Ibrahim

2014-08-01

 
 
 
 
141

Web Based System Architecture for Long Pulse Remote Experimentation  

International Nuclear Information System (INIS)

Remote experimentation methods will be essential in next generation fusion devices. Requirements for long pulse operation will be the real-time visualization of data, the real-time monitoring of data acquisition processes and the real-time interaction with data acquisition systems (start, stop or set-up modifications). INDRA Sistemas S.A., CIEMAT and UPM (polytechnic university of Madrid) have designed a specific software architecture for these purposes. The architecture is based on the BeansNet platform, whose integration with an application server provides a proper solution to the requirements. BeansNet is a JINI based framework developed by INDRA, which makes easy the implementation of a remote participation model based on a Service Oriented Architecture. BeansNet and its interaction with the Messaging Services provides the users with the information acquired by real time acquisition systems, with no further delay than the derived from the information transmission over the network, depending on its bandwidth. The new software architecture has been designed based on the existing experience with the TJ-II remote experimentation system. In that case, different aspects of remote participation in experiments from distributed environments were addressed, as remote configuration of data acquisition systems or user authentication. The new design allows the required real-time interactions within a secure environment and with an easy system administration. (authors) system administration. (authors)

142

Web based system architecture for long pulse remote experimentation  

International Nuclear Information System (INIS)

Remote experimentation (RE) methods will be essential in next generation fusion devices. Requirements for long pulse RE will be: on-line data visualization, on-line data acquisition processes monitoring and on-line data acquisition systems interactions (start, stop or set-up modifications). Note that these methods are not oriented to real-time control of fusion plant devices. INDRA Sistemas S.A., CIEMAT (Centro de Investigaciones Energeticas Medioambientales y Tecnologicas) and UPM (Universidad Politecnica de Madrid) have designed a specific software architecture for these purposes. The architecture can be supported on the BeansNet platform, whose integration with an application server provides an adequate solution to the requirements. BeansNet is a JINI based framework developed by INDRA, which makes easy the implementation of a remote experimentation model based on a Service Oriented Architecture. The new software architecture has been designed on the basis of the experience acquired in the development of an upgrade of the TJ-II remote experimentation system.

143

Patrones arquitectónicos sobre usabilidad en el dominio de las aplicaciones web / Architectural patterns regarding web application domain usability  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: English Abstract in spanish En el contexto de las aplicaciones web, la usabilidad es una de las características de calidad con gran impacto en la aceptación por parte del usuario final. Sin embargo, la relación entre la usabilidad y la arquitectura del software no ha sido totalmente identificada y caracterizada. Algunos trabaj [...] os han encontrado algunas relaciones de la usabilidad con la arquitectura pero no con patrones arquitectónicos. La principal contribución de este artículo es la identificación de los patrones arquitectónicos y en qué medida éstos impactan en las propiedades de usabilidad en el contexto de las aplicaciones web. Este estudio tiene dos utilidades principales: la primera, para los arquitectos y diseñadores de nuevos productos, en la identificación temprana (a nivel de arquitectura) de posibles problemas o ventajas al usar algunos de ellos en una aplicación web; además, los arquitectos podrían identificar debilidades en el diseño inicial, incrementando la satisfacción del usuario final. Y la segunda, cuando una aplicación web está sido evaluada desde el punto de vista de la usabilidad, la detección de posibles problemas o debilidades implica que ésta deba ser mejorada, lo que conlleva a realizar cambios en la aplicación, en las interfaces y a nivel de su arquitectura, en este caso, los patrones permiten relacionar el problema y sugerir la solución más adecuada. El impacto de los patrones arquitectónicos estudiados en este trabajo han sido validados con dos pequeñas y medianas empresas (PyMes) colombianas, las cuales han ejercitado algunos de los patrones propuestos verificando su influencia en las propiedades de la usabilidad. Abstract in english Usability is one of the quality characteristics having the greatest impact on final user acceptation in a web application context. However, the relationship between usability and software architecture has not been completely identified and characterised. Some work has found some relationships betwee [...] n usability and architecture but not between architectural patterns. This paper´s main contribution lies in its identification of architecture patterns and how they have influenced usability within the context of web applications. This study is useful for architects and new product designers regarding the early identification of possible problems and/or advantages (at architectural level), using some of them in a web application. Additionally, architects could identify weaknesses in initial designs thereby increasing final user satisfaction. The study could be useful when a web application is being evaluated, since detecting possible usability problems or weaknesses implies that it should be improved. Consequently, some changes would be made to the application, both in its interfaces and at architectural level. In this case, the problem can be related and the most suitable solution be suggested in terms of patterns. The impact of this work´s architectural pattern has been validated on two Colombian small- and medium-sized enterprises which have exercised some of the proposed patterns and verified their influence on usability properties.

José Luis, Arciniegas Herrera; María Verónica, Fernández de Valdenebro; María Amparo, Hormiga Juspian; Aleyda, Tulande Arroyo; Cesar Alberto, Collazos Ordoñez.

2010-04-01

144

An architecture for wireless sensors in distributed management of electrical distribution systems  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This thesis presents a distributed architecture for the use of wireless sensors in the management of electrical distribution systems. Although the general concept of using wireless sensors for measuring quantities of power lines has previously been introduced, the proposed solutions have not been well integrated within the power system equipment and the automation system. This has severely compromised the applicability of the sensors in the field. However, wireless sensors have several featur...

Nordman, Mikael

2004-01-01

145

A Proposed Architecture for Continuous Web Monitoring Through Online Crawling of Blogs  

CERN Document Server

Getting informed of what is registered in the Web space on time, can greatly help the psychologists, marketers and political analysts to familiarize, analyse, make decision and act correctly based on the society`s different needs. The great volume of information in the Web space hinders us to continuously online investigate the whole space of the Web. Focusing on the considered blogs limits our working domain and makes the online crawling in the Web space possible. In this article, an architecture is offered which continuously online crawls the related blogs, using focused crawler, and investigates and analyses the obtained data. The online fetching is done based on the latest announcements of the ping server machines. A weighted graph is formed based on targeting the important key phrases, so that a focused crawler can do the fetching of the complete texts of the related Web pages, based on the weighted graph.

Naghavi, Mehdi; 10.5121/iju.2012.3102

2012-01-01

146

DEVELOP Chesapeake Bay Watershed Hydrology - UAV Sensor Web  

Science.gov (United States)

The Chesapeake Bay is the largest estuary in the United States, with a watershed extending through six states and the nation's capital. Urbanization and agriculture practices have led to an excess runoff of nutrients and sediment into the bay. Nutrients and sediment loading stimulate the growth of algal blooms associated with various problems including localized dissolved oxygen deficiencies, toxic algal blooms and death of marine life. The Chesapeake Bay Program, among other stakeholder organizations, contributes greatly to the restoration efforts of the Chesapeake Bay. These stakeholders contribute in many ways such as monitoring the water quality, leading clean-up projects, and actively restoring native habitats. The first stage of the DEVELOP Chesapeake Bay Coastal Management project, relating to water quality, contributed to the restoration efforts by introducing NASA satellite-based water quality data products to the stakeholders as a complement to their current monitoring methods. The second stage, to be initiated in the fall 2008 internship term, will focus on the impacts of land cover variability within the Chesapeake Bay Watershed. Multiple student led discussions with members of the Land Cover team at the Chesapeake Bay Program Office in the DEVELOP GSFC 2008 summer term uncovered the need for remote sensing data for hydrological mapping in the watershed. The Chesapeake Bay Program expressed in repeated discussions on Land Cover mapping that significant portions of upper river areas, streams, and the land directly interfacing those waters are not accurately depicted in the watershed model. Without such hydrological mapping correlated with land cover data the model will not be useful in depicting source areas of nutrient loading which has an ecological and economic impact in and around the Chesapeake Bay. The fall 2008 DEVELOP team will examine the use of UAV flown sensors in connection with in-situ and Earth Observation satellite data. To maximize the web of data, students will also examine the NASA's research into self organizing neural-networks to ensure the data is correlated in such a manner as to support the sensor web connections. Additionally, students will learn the operation and functionality of the Chesapeake Bay Program's watershed model to examine and determine the potential for integration of the sensor web data into the watershed model.

Holley, S. D.; Baruah, A.

2008-12-01

147

A novel architecture for information retrieval system based on semantic web  

Science.gov (United States)

Nowadays, the web has enabled an explosive growth of information sharing (there are currently over 4 billion pages covering most areas of human endeavor) so that the web has faced a new challenge of information overhead. The challenge that is now before us is not only to help people locating relevant information precisely but also to access and aggregate a variety of information from different resources automatically. Current web document are in human-oriented formats and they are suitable for the presentation, but machines cannot understand the meaning of document. To address this issue, Berners-Lee proposed a concept of semantic web. With semantic web technology, web information can be understood and processed by machine. It provides new possibilities for automatic web information processing. A main problem of semantic web information retrieval is that when these is not enough knowledge to such information retrieval system, the system will return to a large of no sense result to uses due to a huge amount of information results. In this paper, we present the architecture of information based on semantic web. In addiction, our systems employ the inference Engine to check whether the query should pose to Keyword-based Search Engine or should pose to the Semantic Search Engine.

Zhang, Hui

2011-12-01

148

Importance of the spatial data and the sensor web in the ubiquitous computing area  

Science.gov (United States)

Spatial data has become a critical issue in recent years. In the past years, nearly more than three quarters of databases, were related directly or indirectly to locations referring to physical features, which constitute the relevant aspects. Spatial data is necessary to identify or calculate the relationships between spatial objects when using spatial operators in programs or portals. Originally, calculations were conducted using Geographic Information System (GIS) programs on local computers. Subsequently, through the Internet, they formed a geospatial web, which is integrated into a discoverable collection of geographically related web standards and key features, and constitutes a global network of geospatial data that employs the World Wide Web to process textual data. In addition, the geospatial web is used to gather spatial data producers, resources, and users. Standards also constitute a critical dimension in further globalizing the idea of the geospatial web. The sensor web is an example of the real time service that the geospatial web can provide. Sensors around the world collect numerous types of data. The sensor web is a type of sensor network that is used for visualizing, calculating, and analyzing collected sensor data. Today, people use smart devices and systems more frequently because of the evolution of technology and have more than one mobile device. The considerable number of sensors and different types of data that are positioned around the world have driven the production of interoperable and platform-independent sensor web portals. The focus of such production has been on further developing the idea of an interoperable and interdependent sensor web of all devices that share and collect information. The other pivotal idea consists of encouraging people to use and send data voluntarily for numerous purposes with the some level of credibility. The principal goal is to connect mobile and non-mobile device in the sensor web platform together to operate for serving and collecting information from people.

Akçit, Nuhcan; Tomur, Emrah; Karsl?o?lu, Mahmut O.

2014-08-01

149

EChO fine guidance sensor design and architecture  

Science.gov (United States)

EChO, the Exoplanet Characterization Observatory, is an M-class candidate in the ESA Comic Vision programme. It will provide high resolution, multi-wavelength spectroscopic observations of exoplanets, measure their atmospheric composition, temperature and albedo. The scientific payload is a spectrometer covering the 0.4-11 micron waveband. High photometric stability over a time scale of about 10 hours is one of the most stringent requirements of the EChO mission. As a result, fine pointing stability relative to the host star is mandatory. This will be achieved through a Fine Guidance Sensor (FGS), a separate photometric channel that uses a fraction of the target star signal from the optical channel. The main task of the FGS is to ensure the centering, focusing and guiding of the satellite, but it will also provide supplemental high-precision astrometry and photometry of the target to ground for de-trending the spectra and complementary science. In this paper we give an overview of the current architectural design of the FGS subsystem and discuss related requirements as well as the expected performance.

Ottensamer, Roland; Rataj, Miroslaw; Schrader, Jan-Rutger; Ferstl, Roman; Güdel, Manuel; Kerschbaum, Franz; Luntzer, Armin

2014-08-01

150

An Efficient PKC-Based Security Architecture for Wireless Sensor Networks  

CERN Document Server

In spite of previous widely held belief of the incompatibility of public key cryptography (PKC) schemes for wireless sensor networks (WSNs), some recent works have shown that, PKC based schemes could be implemented for such networks in some ways. The major challenge of employing a PKC scheme in wireless sensor network is posed by the limitations of resources of the tiny sensors. Considering this feature of the sensors, in this paper, we propose an efficient PKC based security architecture with relatively less resource requirements than those of the other previously proposed PKC schemes for WSN. Our security architecture comprises basically of two parts; a key handshaking scheme based on simple linear operations and the derivation of decryption key by a receiver node. Our architecture allows both base-station-to-node or node-to-base-station secure communications, and node-to-node secure communications. Analysis and simulation results show that, our proposed architecture ensures a good level of security for com...

Haque, Md Mokammel; Choi, Byung Goo; Hong, Choong Seon

2007-01-01

151

Web Service Architecture for a Meta Search Engine  

Digital Repository Infrastructure Vision for European Research (DRIVER)

With the rapid advancements in Information Technology, Information Retrieval on Internet is gaining its importance day by day. Nowadays there are millions of Websites and billions of homepages available on the Internet. Search Engines are the essential tools for the purpose of retrieving the required information from the Web. But the existing search engines have many problems such as not having wide scope, imbalance in accessing the sites etc. So, the effectiveness of a search engine plays a ...

Srinivas, K.; Srinivas, P. V. S.; Govardhan, A.

2011-01-01

152

HABILITAMIENTO DE LA WEB PARA MANEJO DE INFORMACIÓN DE GEOSENSORES: SERVICIO DE OBSERVACIÓN DE SENSORES Y SERVICIO DE PLANIFICACIÓN DE SENSORES. UNA MIRADA HACIA SENSOR GRID  

Directory of Open Access Journals (Sweden)

Full Text Available RESUMEN ANALÍTICO Este artículo contiene una visión general sobre redes inalámbricas de sensores y específicamente las redes inalámbricas de geosensores, las cuales permiten el manejo de información geográfca. Se presenta una descripción general de las especifcaciones y servicios de Sensor Web Enablement SWE que desarrolla el concepto de habilitamiento de la web para sensores y es una iniciativa del Open Geospatial Consortium OGC, entidad que tiene como propósito fundamental la defnición de estándares abiertos e interoperables para el manejo de información geográfca. Se particularizan dos de los servicios ofrecidos por SWE como son el Servicio de Observación de Sensores (Sensor Observation Service SOS, que permite el acceso a la web para consultar información recopilada por los sensores y descripciones técnicas de sensores o plataformas de sensores, y el Servicio de Planifcación de Sensores (Sensor Planning Service SPS que facilita la consulta de las capacidades de los sensores y la gestión de las peticiones y transacciones de datos. Se describen aspectos básicos sobre computación Grid vista como una estrategia para crear una infraestructura que permite compartir recursos y potencia computacional. Se da una mirada a Sensor Grid que es una estrategia que integra los conceptos de redes inalámbricas de sensores y computación grid, para aprovechar las posibilidades que ofrecen ambos enfoques. ANALYTICAL SUMMARY This article contains an overview of wireless sensor networks and specifcally wireless geosensor networks, which allow the management of geographic information. It presents an overview of Sensor Web Enablement SWE specifcations and services, which develops the concept of web enablement for sensors and is an initiative of the Open Geospatial Consortium OGC, an entity whose main purpose is the defnition of open and interoperable standards for geographic information management. It particularize two of the services offered by SWE such as the Sensor Observation Service SOS, which allows access Web to obtain information collected by sensors and technical descriptions of sensors or sensor platforms, and Sensor Planning Service SPS which facilitate the consultation the sensor capabilities and the management of data requests and transactions. It describes basic aspects of Grid Computing seen as a strategy to create an infrastructure to share resources and computing power. It gives a look to Sensor Grid which is a strategy that integrates the concepts of wireless sensor networks and grid computing, to exploit the potential of both approaches.

JUAN FEDERICO GÓMEZ ESTUPIÑAN

2011-04-01

153

From Sensor to Observation Web with environmental enablers in the Future Internet.  

Science.gov (United States)

This paper outlines the grand challenges in global sustainability research and the objectives of the FP7 Future Internet PPP program within the Digital Agenda for Europe. Large user communities are generating significant amounts of valuable environmental observations at local and regional scales using the devices and services of the Future Internet. These communities' environmental observations represent a wealth of information which is currently hardly used or used only in isolation and therefore in need of integration with other information sources. Indeed, this very integration will lead to a paradigm shift from a mere Sensor Web to an Observation Web with semantically enriched content emanating from sensors, environmental simulations and citizens. The paper also describes the research challenges to realize the Observation Web and the associated environmental enablers for the Future Internet. Such an environmental enabler could for instance be an electronic sensing device, a web-service application, or even a social networking group affording or facilitating the capability of the Future Internet applications to consume, produce, and use environmental observations in cross-domain applications. The term "envirofied" Future Internet is coined to describe this overall target that forms a cornerstone of work in the Environmental Usage Area within the Future Internet PPP program. Relevant trends described in the paper are the usage of ubiquitous sensors (anywhere), the provision and generation of information by citizens, and the convergence of real and virtual realities to convey understanding of environmental observations. The paper addresses the technical challenges in the Environmental Usage Area and the need for designing multi-style service oriented architecture. Key topics are the mapping of requirements to capabilities, providing scalability and robustness with implementing context aware information retrieval. Another essential research topic is handling data fusion and model based computation, and the related propagation of information uncertainty. Approaches to security, standardization and harmonization, all essential for sustainable solutions, are summarized from the perspective of the Environmental Usage Area. The paper concludes with an overview of emerging, high impact applications in the environmental areas concerning land ecosystems (biodiversity), air quality (atmospheric conditions) and water ecosystems (marine asset management). PMID:22163827

Havlik, Denis; Schade, Sven; Sabeur, Zoheir A; Mazzetti, Paolo; Watson, Kym; Berre, Arne J; Mon, Jose Lorenzo

2011-01-01

154

From Sensor to Observation Web with Environmental Enablers in the Future Internet  

Directory of Open Access Journals (Sweden)

Full Text Available This paper outlines the grand challenges in global sustainability research and the objectives of the FP7 Future Internet PPP program within the Digital Agenda for Europe. Large user communities are generating significant amounts of valuable environmental observations at local and regional scales using the devices and services of the Future Internet. These communities’ environmental observations represent a wealth of information which is currently hardly used or used only in isolation and therefore in need of integration with other information sources. Indeed, this very integration will lead to a paradigm shift from a mere Sensor Web to an Observation Web with semantically enriched content emanating from sensors, environmental simulations and citizens. The paper also describes the research challenges to realize the Observation Web and the associated environmental enablers for the Future Internet. Such an environmental enabler could for instance be an electronic sensing device, a web-service application, or even a social networking group affording or facilitating the capability of the Future Internet applications to consume, produce, and use environmental observations in cross-domain applications. The term “envirofied” Future Internet is coined to describe this overall target that forms a cornerstone of work in the Environmental Usage Area within the Future Internet PPP program. Relevant trends described in the paper are the usage of ubiquitous sensors (anywhere, the provision and generation of information by citizens, and the convergence of real and virtual realities to convey understanding of environmental observations. The paper addresses the technical challenges in the Environmental Usage Area and the need for designing multi-style service oriented architecture. Key topics are the mapping of requirements to capabilities, providing scalability and robustness with implementing context aware information retrieval. Another essential research topic is handling data fusion and model based computation, and the related propagation of information uncertainty. Approaches to security, standardization and harmonization, all essential for sustainable solutions, are summarized from the perspective of the Environmental Usage Area. The paper concludes with an overview of emerging, high impact applications in the environmental areas concerning land ecosystems (biodiversity, air quality (atmospheric conditions and water ecosystems (marine asset management.

Jose Lorenzo Mon

2011-03-01

155

Using a Web Services Architecture with Me, Myself and I  

Directory of Open Access Journals (Sweden)

Full Text Available The UW-Madison Libraries Library Course Page system is used to deliver electronic reserves materials and course-focused library instruction webpages to students. As part of a rewrite of our system we broke the application into three component pieces: a file repository, a course timetable data service, and an interface application for building and viewing individual course pages. The new three-piece system was written with an inward facing service-oriented architecture that allowed us to choose the best technologies to solve each of the tasks the entire system needs to accomplish.

Stephen Meyer

2009-06-01

156

WebML and .NET Architecture for Developing Students Appointment Management System  

Directory of Open Access Journals (Sweden)

Full Text Available This study presents the application of Web Modeling Language (WebML in a Student Appointment Management System (SAMS to help students and lecturers arrange meetings in an effective and efficient way in a university or college environment. WebML is well designed for web applications and .NET four-tier architecture offers maximum functionality and flexibility in a heterogeneous, web based environment. Each WebML elements is transformed accordingly to Hypertext model as known as site views of SAMS is believed to work best in implementing an appointment management system and turning the traditional management approach into current web technology. Comparisons with existing similar systems are presented based on three typical quality attribute requirements for web applications: usability, performance and maintainability. The usability of SAMS is measured by applying the Goal-Question-Metrics (GQM approach in questionnaires to collect users’ opinions on the system, especially the interface, while the maintainability of this system is measured using the cyclomatic complexity technique. From the survey it is proven that SAMS fulfils the usability requirements as the results show that 67% of lecturers and 75% of students were satisfied with the overall system.

M.H.N.M. Nasir

2009-01-01

157

A Real-Time-Enabled, Blackboard-Based, Publish/Subscribe Architecture for Wireless Sensor Nodes  

Directory of Open Access Journals (Sweden)

Full Text Available Wireless sensor network nodes have only limited resources concerning memory and battery life-time. Mem- ory can be efficiently used by sharing data, and the life-time of a battery can be extended, when the node has long power saving sleep-phases. We propose a publish/subscribe architecture that achieves these two aims. The results of our work are of great interest for sensor application developers, giving them now the opportu- nity to use our architecture for sharing data among different applications on the node as well as the different layers of the operating system. We introduce a blackboard which is used for centrally storing published val- ues, like measured data from a monitored sensor. This makes it possible to share stored data without monitoring the sensors once again, which is advantageously concerning power consumption, memory space, and reaction time. Beside the proposed publish/subscribe method for sensor nodes with its notification possibili- ties, our architecture fulfills also real-time requirements. We show how the well-known sensor operating system MANTIS OS can be extended by a real-time enabled, blackboard-based publish/subscribe architect- ture. This architecture and first of all its implementation is of special interest for cross layer optimization of sensor applications. Cross-layer approaches benefit from our architecture because the available implementa- tion can be used as an efficient framework for central storing and managing of shared values.

Bjorn Stelte

2010-08-01

158

FAST REAL TIME ANALYSIS OF WEB SERVER MASSIVE LOG FILES USING AN IMPROVED WEB MINING ARCHITECTURE  

Directory of Open Access Journals (Sweden)

Full Text Available The web has played a vital role to detect the information and finding the reasons to organize a system. As the web sites were increased, the web log files also increased based on the web searching. Our challenge and the task are to reduce the log files and classify the best results to reach the task which we used. Aimed to overcome the deficiency of abundant data to web mining, the study proposed a path extraction using Euclidean Distance based algorithm with a sequential pattern clustering mining algorithm. First, we construct the Relational Information System using original data sets. Second, we here cluster the data by the Sequential Pattern Clustering Method for the data sets which make use of the data to produce Core of Information System. Web mining core data is the most important and necessary information which cannot reduce an original Information System. So it can get the same effect as original data sets to data analysis and can construct classification modeling using it. Third, we here used Sequential pattern clustering method with the help of Path Extraction. The experiment shows that the proposed algorithm can get high efficiency and avoid the abundant data in follow-up data processing.

Hussain Mohammad Abu-Dalbouh

2013-01-01

159

Web Prior Architecture to Avoid Threats and Enhance Intrusion Response System  

Directory of Open Access Journals (Sweden)

Full Text Available Web is hierarchically composed of entities such as domains, Web sites and documents distributed over Web sites and linked together by hyperlinks. The response component of the intrusion detection system issues the response to the jarring requests. In this paper, the intension is to allow the legitimate user to access the target website and perform the selective operations on the database to avoid threats and protect the database from unauthorized users. The designed Web Prior Architecture (WPA permits the legal client to obtain the privilege license by clicking on an authority link provided by the referrer. Using this license, the client can get the liberty to perform the operations on the target website. In that website, database can be accessed by the client with the selective permissions. These can be performed by the two methods, namely strategy toning and strategy management. By this way, the database is accessed in a highly securable manner. The massive scale of this study specifies the method to avoid the threats from the unauthorized users and augment the intrusion response system. This will protect the target website and its database from the unconstitutional users. Our pragmatic study demonstrates that Web Prior Architecture enables the legitimate user to connect to the target website and perform selective database operations.

K.S. Ravichandran

2012-09-01

160

Distributed Web Service Architecture Towards Robotic Speech Communication: A Vietnamese Case Study  

Directory of Open Access Journals (Sweden)

Full Text Available Robotics is emerging as one of the most prominent research areas in the world and is recently attracting the Vietnamese research community. For the purpose of determining an entrance for a Vietnamese human interacting robotics system, this paper is aimed at proposing a service?oriented architecture for location assistance robotic systems made out of loosely?coupled and distributed web services. The proposed platform consists of two major components: a Speech Processing System (SPS and a Service Manipulating System (SMS. This architecture allows our robot to meet three critical human interaction robotic systems requirements: flexibility, scalability and reliability.

Nhut M. Pham

2013-02-01

 
 
 
 
161

Arquitectura de sistemas tecnológicos para la educación basada en Web / Technology System Architecture for Web-Based Education  

Scientific Electronic Library Online (English)

Full Text Available SciELO Mexico | Language: Spanish Abstract in spanish En este trabajo se presenta una nueva arquitectura para el desarrollo de sistemas de Educación Basada en Web. Estos sistemas se centran en el estudiante y se adaptan a sus necesidades personales de forma inteligente. La arquitectura se basa en la especificación IEEE 1484 LTSA (Learning Technology Sy [...] stem Architecture) y reúne a los modelos de desarrollo de software y diseño instruccional. Por una parte, el modelo de desarrollo de software se encuentra sustentado bajo un Sistema Multi-Agentes (MAS), emplea los métodos y técnicas de la Ingeniería de Dominio para el desarrollo de CARIOO (Componentes de Aprendizaje Reutilizables e Inteligentes Orientados a Objetos). Los CARIOO son un tipo especial de Objetos de Contenido Compartible de acuerdo a SCORM (Sharable Content Object Reusable Model). Por otra, el modelo de diseño instruccional incorpora un modelo mental como los Mapas Conceptuales (MC) para transmitir, construir y generar conocimientos adecuados a este tipo de ambiente. Abstract in english In this paper a new architecture for development of Web-Based Education systems is presented. The se systems are centered in the learner and adapted to their personals needs in intelligent form. The architecture is based on the IEEE 1484 LTSA (Learning Technology System Architecture) specification a [...] nd it assembles to software development and instructional design patterns. On the one hand, the software development pattern is supported under a Multi-Agents System, it employs the methods and technical of the Domain Engineering for development of IRLCOO (Intelligent Reusable Learning Components Object Oriented). IRLCOO are a special type of Sharable Content Object according to SCORM (Sharable Content Object Reusable Model). On the other hand, the instructional design pattern incorporates a mental model as the Conceptual Maps to transmit, build and generate appropriate knowledge to this educational environment type.

A, Canales-Cruz; R, Peredo-Valderrama; L, Balladares-Ocaña; I, Peredo-Valderrama; J.H., Sossa-Azuela.

162

Arquitectura de sistemas tecnológicos para la educación basada en Web / Technology System Architecture for Web-Based Education  

Scientific Electronic Library Online (English)

Full Text Available SciELO Mexico | Language: Spanish Abstract in spanish En este trabajo se presenta una nueva arquitectura para el desarrollo de sistemas de Educación Basada en Web. Estos sistemas se centran en el estudiante y se adaptan a sus necesidades personales de forma inteligente. La arquitectura se basa en la especificación IEEE 1484 LTSA (Learning Technology Sy [...] stem Architecture) y reúne a los modelos de desarrollo de software y diseño instruccional. Por una parte, el modelo de desarrollo de software se encuentra sustentado bajo un Sistema Multi-Agentes (MAS), emplea los métodos y técnicas de la Ingeniería de Dominio para el desarrollo de CARIOO (Componentes de Aprendizaje Reutilizables e Inteligentes Orientados a Objetos). Los CARIOO son un tipo especial de Objetos de Contenido Compartible de acuerdo a SCORM (Sharable Content Object Reusable Model). Por otra, el modelo de diseño instruccional incorpora un modelo mental como los Mapas Conceptuales (MC) para transmitir, construir y generar conocimientos adecuados a este tipo de ambiente. Abstract in english In this paper a new architecture for development of Web-Based Education systems is presented. The se systems are centered in the learner and adapted to their personals needs in intelligent form. The architecture is based on the IEEE 1484 LTSA (Learning Technology System Architecture) specification a [...] nd it assembles to software development and instructional design patterns. On the one hand, the software development pattern is supported under a Multi-Agents System, it employs the methods and technical of the Domain Engineering for development of IRLCOO (Intelligent Reusable Learning Components Object Oriented). IRLCOO are a special type of Sharable Content Object according to SCORM (Sharable Content Object Reusable Model). On the other hand, the instructional design pattern incorporates a mental model as the Conceptual Maps to transmit, build and generate appropriate knowledge to this educational environment type.

A, Canales-Cruz; R, Peredo-Valderrama; L, Balladares-Ocaña; I, Peredo-Valderrama; J.H., Sossa-Azuela.

2009-06-01

163

A Web-based DSS Architecture and its Forecasting Core in Supply Chain Management  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In a competitive market environment, supply chain management (SCM) has been critical for companies to survive. Demand planning plays an important role in SCM, for it provides accurate demand forecasts which may achieve customer satisfaction by offering benefits such as low inventory level, short lead time, efficient resource allocation, and quick response. To obtain more accurate forecasts, this study presents a web-based Decision Support System (DSS) architecture and its forecasting core. Th...

Tien-You Wang; Din-Horng Yeh

2009-01-01

164

NAC, une architecture pour l'adaptation multimédia sur le web  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The Web is evolving towards richer contents and diverse media that are accessed with different devices through multiple kinds of network. This heterogeneous, mobile and changing environment requires that multimedia information delivered by servers be adapted to the actual conditions of use. For that purpose, a number of methods, languages, formats and protocols are developed, especially by W3C. The NAC architecture presented in this article was designed and implemented based on these technolo...

Layai?da, Nabil; Lemlouma, Tayeb; Quint, Vincent

2005-01-01

165

Evaluation of a Heterogeneous Sensor Network Architecture for Highly Mobile Users  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents experimental results of a heterogeneous sensor network architecture, which is a combination of a wireless sensor network and a personal area network. The proposed architecture uses the IEEE 802.15.4 standard to transmit sensor data to a sensor node which in turn forwards the data using TCP/IP to a database on the Internet via a Bluetooth-equipped mobile phone and the mobile telephone access network. The performance of the entire communication chain is evaluated. First, a 3G network's performance is evaluated by measuring its round trip time for packet transmission. Second, the real-world end-to-end delay between a sensor node and a database server on the Internet is measured using two different experimental set-ups: single-hop transmission and two hops transmission. Finally, the proposed architecture's scalability is estimated in a Matlab simulation using the results of the experiments as a base. The results show that the proposed architecture is applicable for small-scale sensor networks used by highly mobile users.

Jerker Delsing

2011-05-01

166

Energy-Aware Fragmented Memory Architecture with a Switching Power Supply for Sensor Nodes  

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Full Text Available The basic sensor node architecture in a wireless sensor network contains sensing, transceiver, processing and memory units along with the power supply module. Because the basic sensor network application nature is surveillance, these networks may be deployed in a remote environment without human intervention. The sensor nodes are also battery-powered tiny devices with limited memory capacity. Because of these sensor node limitations, the architecture can be modified to efficiently utilise energy during memory accesses by dividing the memory into multiple banks and including a memory switching controller unit and a power switching module. This modification conserves energy, so power can be supplied only to the bank or part of the memory being accessed instead of powering the entire memory module, thus leading to efficient energy consumption. Simulations have been performed on fragmented memory architecture by incorporating the M/M/1 queuing model. When the packets get queued up, energy utilisation and a packet drop at the sensor node is observed. The energy consumption is reduced by an average of 70%, and there is significantly less packet drop compared to the normal memory architecture. This leads to increase in node and network lifetime and prevents information loss

Harish H Kenchannavar

2013-04-01

167

ARCHITECTURE AND FUNCTIONALITY OF WEB-MULTIMEDIA ENCYCLOPEDIA OF «HISTORY OF PEDAGOGY» ??????????? ?? ???????????????? WEB – ??????????? ???????????? «??????? ??????????»  

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Full Text Available The urgency of the material, presented in the article, is caused by the need for the implementation of the triple-subject didactic model of a modern teacher training and formation of informatical competences of the future teachers of primary education. WEB-multimedia encyclopedia “History of pedagogy” (http://webhp.ksu.ks.ua assigns an ideology of the new educational instruments and it is capable not only to provide with the course mastering on a high level, but also to update the content of training course constantly (due to creation and use of new components, it is essential to intensify the process of knowledge, and also to support the individual trajectory of training.???????????? ?????????, ??????????? ? ??????, ?????????? ???????????? ????????????? ??????’?????? ??????????? ?????? ?????????? ????????? ???????? ?? ?????????? ????????????? ??????????????? ? ????????? ???????? ???????? ?????. WEB-??????????? ???????????? «??????? ??????????» (http://webhp.ksu.ks.ua ????? ????????? ?????? ?????????????? ???????? ? ?????? ?? ?????? ??????????? ????????? ????? ?? ???????? ?????, ??? ? ???????? ?????????? ????? ??????????? ???????? (?? ??????? ????????? ? ???????????? ????? ???????????, ??????? ??????????????? ?????? ????????, ? ????? ?????????? ????????????? ?????????? ????????.

?.?. ????????

2011-02-01

168

Distributed Real Time Architecture for Data Placement in Wireless Sensor Networks  

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Full Text Available Problem statement: Application scenarios of Wireless Sensor Networks (WSN create interesting design challenges since the sensor nodes used to collect and communicate data may fail suddenly and unpredictably. The issue of real-time and reliable data delivery is extremely important for taking effective decisions in WSN. Approach: In this study we proposed architecture for reliable and real-time approach for data placement using sensor clusters. Instead of storing information in individual cluster heads as suggested in some protocols, in our architecture we suggest storing of information of all clusters within a cell in the corresponding base station. For data dissemination and action we have used Action and Relay Stations (ARS. Results: We developed programming model for formal specification of our architecture. Conclusion: Present model not only offers real time sensing and monitoring, but also provides real time dynamic decision making based on the sensed data. Moreover it prolongs network life time.

Sanjeev Gupta

2009-01-01

169

Future Unified Communication Based on Ubiquitous Hierarchical Generalized-Sensor Network Architecture  

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Full Text Available Recent advances in wireless sensor network (WSN and radio frequency identifier (RFID have made it possible to extend current human-to-human communication to the future unified communication environment among human society, computer network and the external physical world. A ubiquitous hierarchical generalized-sensor network (UHGSN is presented in this paper as a typical network model for such unified communication architecture. The sensor information processing unit and the hierarchical distributed agent server are introduced as the basic network elements in this architecture for effective information communication, and the topology, addressing and recovery problems are analyzed. As the basic applications, the combined “key word” based characterized searching mechanism and the performance monitoring processes are discussed, along with the corresponding protocol message definition and encoding format. Simulation results show the advancements of the presented hierarchical architecture and the job-list based characterized searching mechanism.

Zhitong Huang

2012-03-01

170

Design and Implementation of an Architectural Framework for Web Portals in a Ubiquitous Pervasive Environment  

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Full Text Available Web Portals function as a single point of access to information on the World Wide Web (WWW. The web portal always contacts the portal’s gateway for the information flow that causes network traffic over the Internet. Moreover, it provides real time/dynamic access to the stored information, but not access to the real time information. This inherent functionality of web portals limits their role for resource constrained digital devices in the Ubiquitous era (U-era. This paper presents a framework for the web portal in the U-era. We have introduced the concept of Local Regions in the proposed framework, so that the local queries could be solved locally rather than having to route them over the Internet. Moreover, our framework enables one-to-one device communication for real time information flow. To provide an in-depth analysis, firstly, we provide an analytical model for query processing at the servers for our framework-oriented web portal. At the end, we have deployed a testbed, as one of the world’s largest IP based wireless sensor networks testbed, and real time measurements are observed that prove the efficacy and workability of the proposed framework.

Wun-Cheol Jeong

2009-07-01

171

Automated Data Quality Assurance using OGC Sensor Web Enablement Frameworks for Marine Observatories  

Science.gov (United States)

Over the past years, environmental sensors have continuously improved by becoming smaller, cheaper, and more intelligent. Therefore, many sensor networks are increasingly deployed to monitor our environment. But due to the large number of sensor manufacturers, accompanying protocols and data encoding, automated integration and data quality assurance of diverse sensors in an observing systems is not straightforward, requiring development of data management code and manual tedious configuration. However, over the past few years it has been demonstrated that Open-Geospatial Consortium (OGC) frameworks can enable web services with fully-described sensor systems, including data processing, sensor characteristics and quality control tests and results. So far, the SWE framework does not describe how to integrate sensors on-the-fly with minimal human intervention. The data management software which enables access to sensors, data processing and quality control tests has to be implemented and the results have to be manually mapped to the SWE models. In this contribution, we describe a Sensor Plug & Play infrastructure for the Sensor Web by combining (1) OGC PUCK protocol - a simple standard embedded instrument protocol to store and retrieve directly from the devices the declarative description of sensor characteristics and quality control tests, (2) an automatic mechanism for data processing and quality control tests underlying the Sensor Web - the Sensor Interface Descriptor (SID) concept, as well as (3) a model for the declarative description of sensor which serves as a generic data management mechanism - designed as a profile and extension of OGC SWE's SensorML standard. We implement and evaluate our approach by applying it to the OBSEA Observatory, and can be used to demonstrate the ability to assess data quality for temperature, salinity, air pressure and wind speed and direction observations off the coast of Garraf, in the north-eastern Spain.

Toma, Daniel; Bghiel, Ikram; del Rio, Joaquin; Hidalgo, Alberto; Carreras, Normandino; Manuel, Antoni

2014-05-01

172

Design and performance of an integrated ground and space sensor web for monitoring active volcanoes.  

Science.gov (United States)

An interdisciplinary team of computer, earth and space scientists collaborated to develop a sensor web system for rapid deployment at active volcanoes. The primary goals of this Optimized Autonomous Space In situ Sensorweb (OASIS) are to: 1) integrate complementary space and in situ (ground-based) elements into an interactive, autonomous sensor web; 2) advance sensor web power and communication resource management technology; and 3) enable scalability for seamless addition sensors and other satellites into the sensor web. This three-year project began with a rigorous multidisciplinary interchange that resulted in definition of system requirements to guide the design of the OASIS network and to achieve the stated project goals. Based on those guidelines, we have developed fully self-contained in situ nodes that integrate GPS, seismic, infrasonic and lightning (ash) detection sensors. The nodes in the wireless sensor network are linked to the ground control center through a mesh network that is highly optimized for remote geophysical monitoring. OASIS also features an autonomous bidirectional interaction between ground nodes and instruments on the EO-1 space platform through continuous analysis and messaging capabilities at the command and control center. Data from both the in situ sensors and satellite-borne hyperspectral imaging sensors stream into a common database for real-time visualization and analysis by earth scientists. We have successfully completed a field deployment of 15 nodes within the crater and on the flanks of Mount St. Helens, Washington. The demonstration that sensor web technology facilitates rapid network deployments and that we can achieve real-time continuous data acquisition. We are now optimizing component performance and improving user interaction for additional deployments at erupting volcanoes in 2010.

Lahusen, Richard; Song, Wenzhan; Kedar, Sharon; Shirazi, Behrooz; Chien, Steve; Doubleday, Joshua; Davies, Ashley; Webb, Frank; Dzurisin, Dan; Pallister, John

2010-05-01

173

WEB-ENABLED GENERALIZED ARCHITECTURAL MODEL FOR ONLINE POWER SYSTEM ANALYSIS  

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Full Text Available In this study, an effective Web-enabled generalized architectural model is proposed. The proposed model makes the power system analysis to be completely secured, distributed, platform-independent and language-independent. Although significant progress has been made for on-line power system analysis in distributed environment, still efficient distributed environment has not yet been exploited. The Web-enabled architectural models are emerging as basic methodologies to support the integration of different power system applications using open Internet standard. The existing RMI models for solving multi-area power system problems in distributed environment, has its limitations to use in internet-based applets. The main objective of this study is to convert existing RMI model for power system applications into Web based model for on-line monitoring of multi-area power systems in distributed environment. Test bench has been created to carry out the performance analysis of the proposed model. Using the proposed model, load flow analysis is carried out for various bus systems. The results obtained are reported.

Boopathi C. Sengodan

2013-01-01

174

A Multi-Robot Control Architecture for Fault-Tolerant Sensor-Based Coverage  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Sensor-based coverage problems have many applications such as patrolling, search-rescue, and surveillance. Using multi-robot team increases efficiency by reducing completion time of a sensor-based coverage task. Robustness to robot failures is another advantage of using multiple robots for coverage. Although there are many works to increase the efficiency of coverage methods, there are few works related to robot failures in the literature. In this paper, fault-tolerant control architecture is...

Metin Ozkan; Gokhan Kirlik; Osman Parlaktuna; Alpaslan Yufka; Ahmet Yazici

2010-01-01

175

STOMP: A Software Architecture for the Design and Simulation UAV-Based Sensor Networks  

Energy Technology Data Exchange (ETDEWEB)

This paper presents the Simulation, Tactical Operations and Mission Planning (STOMP) software architecture and framework for simulating, controlling and communicating with unmanned air vehicles (UAVs) servicing large distributed sensor networks. STOMP provides hardware-in-the-loop capability enabling real UAVs and sensors to feedback state information, route data and receive command and control requests while interacting with other real or virtual objects thereby enhancing support for simulation of dynamic and complex events.

Jones, E D; Roberts, R S; Hsia, T C S

2002-10-28

176

An efficient architecture for the integration of sensor and actuator networks into the future internet  

Science.gov (United States)

In the future, sensors will enable a large variety of new services in different domains. Important application areas are service adaptations in fixed and mobile environments, ambient assisted living, home automation, traffic management, as well as management of smart grids. All these applications will share a common property, the usage of networked sensors and actuators. To ensure an efficient deployment of such sensor-actuator networks, concepts and frameworks for managing and distributing sensor data as well as for triggering actuators need to be developed. In this paper, we present an architecture for integrating sensors and actuators into the future Internet. In our concept, all sensors and actuators are connected via gateways to the Internet, that will be used as comprehensive transport medium. Additionally, an entity is needed for registering all sensors and actuators, and managing sensor data requests. We decided to use a hierarchical structure, comparable to the Domain Name Service. This approach realizes a cost-efficient architecture disposing of "plug and play" capabilities and accounting for privacy issues.

Schneider, J.; Klein, A.; Mannweiler, C.; Schotten, H. D.

2011-08-01

177

A unified architecture for biomedical search engines based on semantic web technologies.  

Science.gov (United States)

There is a huge growth in the volume of published biomedical research in recent years. Many medical search engines are designed and developed to address the over growing information needs of biomedical experts and curators. Significant progress has been made in utilizing the knowledge embedded in medical ontologies and controlled vocabularies to assist these engines. However, the lack of common architecture for utilized ontologies and overall retrieval process, hampers evaluating different search engines and interoperability between them under unified conditions. In this paper, a unified architecture for medical search engines is introduced. Proposed model contains standard schemas declared in semantic web languages for ontologies and documents used by search engines. Unified models for annotation and retrieval processes are other parts of introduced architecture. A sample search engine is also designed and implemented based on the proposed architecture in this paper. The search engine is evaluated using two test collections and results are reported in terms of precision vs. recall and mean average precision for different approaches used by this search engine. PMID:20703566

Jalali, Vahid; Matash Borujerdi, Mohammad Reza

2011-04-01

178

Web-Based Collaborative Learning Architecture for Remote Experiment on Control of Bioreactor’s Environment  

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Full Text Available The unprecedented growth in Internet technologies has created revolutionary changes in collaborative working in an on-line environment with round the world accessibility. The adoption of collaborative learning tools with remote laboratory enhances the experiential learning aspects of engineering education. This paper presents a collaborative learning and remote experiment on the control of a bioreactor environment by establishing communication between the process control computer and remote users through the Internet. The software application is developed using graphical programming tools to control the process parameters and to set the control constants associated with the PID control system. The LabVIEW virtual instruments transfer information to web clients is performed using web server and standard internet browsers for data access. Multimedia features are added to the architecture to supplement the teaching and learning activities. The proposed system structure and functionalities tend towards the translation of traditional collaborative characteristics into an Internet based on-line collaborative learning environment.

A.P Jagadeesh Chandra

2009-04-01

179

Prototype of Multifunctional Full-text Library in the Architecture Web-browser / Web-server / SQL-server  

Science.gov (United States)

Within the framework of the research program "Textaurus" an operational prototype of multifunctional library T-Libra v.4.1. has been created which makes it possible to carry out flexible parametrizable search within a full-text database. The information system is realized in the architecture Web-browser / Web-server / SQL-server. This allows to achieve an optimal combination of universality and efficiency of text processing, on the one hand, and convenience and minimization of expenses for an end user (due to applying of a standard Web-browser as a client application), on the other one. The following principles underlie the information system: a) multifunctionality, b) intelligence, c) multilingual primary texts and full-text searching, d) development of digital library (DL) by a user ("administrative client"), e) multi-platform working. A "library of concepts", i.e. a block of functional models of semantic (concept-oriented) searching, as well as a subsystem of parametrizable queries to a full-text database, which is closely connected with the "library", serve as a conceptual basis of multifunctionality and "intelligence" of the DL T-Libra v.4.1. An author's paragraph is a unit of full-text searching in the suggested technology. At that, the "logic" of an educational / scientific topic or a problem can be built in a multilevel flexible structure of a query and the "library of concepts", replenishable by the developers and experts. About 10 queries of various level of complexity and conceptuality are realized in the suggested version of the information system: from simple terminological searching (taking into account lexical and grammatical paradigms of Russian) to several kinds of explication of terminological fields and adjustable two-parameter thematic searching (a [set of terms] and a [distance between terms] within the limits of an author's paragraph are such parameters correspondingly).

Lyapin, Sergey; Kukovyakin, Alexey

180

Reconfigurable middleware architectures for large scale sensor networks  

Energy Technology Data Exchange (ETDEWEB)

Wireless sensor networks, in an effort to be energy efficient, typically lack the high-level abstractions of advanced programming languages. Though strong, the dichotomy between these two paradigms can be overcome. The SENSIX software framework, described in this dissertation, uniquely integrates constraint-dominated wireless sensor networks with the flexibility of object-oriented programming models, without violating the principles of either. Though these two computing paradigms are contradictory in many ways, SENSIX bridges them to yield a dynamic middleware abstraction unifying low-level resource-aware task reconfiguration and high-level object recomposition.

Brennan, Sean M.

2010-03-01

 
 
 
 
181

Wireless sensors with dual-controller architecture for active diagnosis in structural health monitoring  

International Nuclear Information System (INIS)

Wireless sensor technology, which integrates transducers with microcontrollers and wireless communication, has become increasingly vital in structural health monitoring (SHM) applications. However, the low I/O (input/output) throughput of conventional wireless sensors impedes their usage in applications using high-frequency signals, such as active diagnosis and passive acoustic emission (AE). In this paper, the limitations of extending conventional wireless sensors to handle high-speed acquisition are first identified and discussed. Based on the efforts made in improving wireless sensors with centralized system architecture, a novel dual-controller based architecture is proposed to facilitate high-speed data acquisition and improve power efficiency. Then, a wireless sensor platform, specifically designed for active diagnosis employing stress waves to localize damages, is presented. The newly developed wireless sensor with dimensions of 30 mm × 30 mm × 35 mm utilizes a field programmable gate array (FPGA) as a secondary controller and can support a sampling rate up to 20 million samples per second (Msps). Laboratory experiments for verification show that the wireless sensor can explore new applications at the opposite end of the spectrum from conventional applications: those involving high fidelity and high-speed data acquisition

182

Botnet Detection Architecture Based on Heterogeneous Multi-sensor Information Fusion  

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Full Text Available As technology has been developed rapidly, botnet threats to the global cyber community are also increasing. And the botnet detection has recently become a major research topic in the field of network security. Most of the current detection approaches work only on the evidence from single information source, which can not hold all the traces of botnet and hardly achieve high accuracy. In this paper, a novel botnet detection architecture based on heterogeneous multi-sensor information fusion is proposed. The architecture is designed to carry out information integration in the three fusion levels of data, feature, and decision. As the core component, a feature extraction module is also elaborately designed. And an extended algorithm of the Dempster-Shafer (D-S theory is proved and adopted in decision fusion. Furthermore, a representative case is provided to illustrate that the detection architecture can effectively fuse the complicated information from various sensors, thus to achieve better detection effect.

HaiLong Wang

2011-12-01

183

An Integrative Architecture for a Sensor-Supported Trust Management System  

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Full Text Available Trust plays a key role not only in e-worlds and emerging pervasive computing environments, but also already for millennia in human societies. Trust management solutions that have being around now for some fifteen years were primarily developed for the above mentioned cyber environments and they are typically focused on artificial agents, sensors, etc. However, this paper presents extensions of a new methodology together with architecture for trust management support that is focused on humans and human-like agents. With this methodology and architecture sensors play a crucial role. The architecture presents an already deployable tool for multi and interdisciplinary research in various areas where humans are involved. It provides new ways to obtain an insight into dynamics and evolution of such structures, not only in pervasive computing environments, but also in other important areas like management and decision making support.

Denis Tr?ek

2012-08-01

184

Integration of Grid and Sensor Web for Flood Monitoring and Risk Assessment from Heterogeneous Data  

Science.gov (United States)

Over last decades we have witnessed the upward global trend in natural disaster occurrence. Hydrological and meteorological disasters such as floods are the main contributors to this pattern. In recent years flood management has shifted from protection against floods to managing the risks of floods (the European Flood risk directive). In order to enable operational flood monitoring and assessment of flood risk, it is required to provide an infrastructure with standardized interfaces and services. Grid and Sensor Web can meet these requirements. In this paper we present a general approach to flood monitoring and risk assessment based on heterogeneous geospatial data acquired from multiple sources. To enable operational flood risk assessment integration of Grid and Sensor Web approaches is proposed [1]. Grid represents a distributed environment that integrates heterogeneous computing and storage resources administrated by multiple organizations. SensorWeb is an emerging paradigm for integrating heterogeneous satellite and in situ sensors and data systems into a common informational infrastructure that produces products on demand. The basic Sensor Web functionality includes sensor discovery, triggering events by observed or predicted conditions, remote data access and processing capabilities to generate and deliver data products. Sensor Web is governed by the set of standards, called Sensor Web Enablement (SWE), developed by the Open Geospatial Consortium (OGC). Different practical issues regarding integration of Sensor Web with Grids are discussed in the study. We show how the Sensor Web can benefit from using Grids and vice versa. For example, Sensor Web services such as SOS, SPS and SAS can benefit from the integration with the Grid platform like Globus Toolkit. The proposed approach is implemented within the Sensor Web framework for flood monitoring and risk assessment, and a case-study of exploiting this framework, namely the Namibia SensorWeb Pilot Project, is described. The project was created as a testbed for evaluating and prototyping key technologies for rapid acquisition and distribution of data products for decision support systems to monitor floods and enable flood risk assessment. The system provides access to real-time products on rainfall estimates and flood potential forecast derived from the Tropical Rainfall Measuring Mission (TRMM) mission with lag time of 6 h, alerts from the Global Disaster Alert and Coordination System (GDACS) with lag time of 4 h, and the Coupled Routing and Excess STorage (CREST) model to generate alerts. These are alerts are used to trigger satellite observations. With deployed SPS service for NASA's EO-1 satellite it is possible to automatically task sensor with re-image capability of less 8 h. Therefore, with enabled computational and storage services provided by Grid and cloud infrastructure it was possible to generate flood maps within 24-48 h after trigger was alerted. To enable interoperability between system components and services OGC-compliant standards are utilized. [1] Hluchy L., Kussul N., Shelestov A., Skakun S., Kravchenko O., Gripich Y., Kopp P., Lupian E., "The Data Fusion Grid Infrastructure: Project Objectives and Achievements," Computing and Informatics, 2010, vol. 29, no. 2, pp. 319-334.

Kussul, Nataliia; Skakun, Sergii; Shelestov, Andrii

2013-04-01

185

Model of Real Time Architecture for Data Placement in Wireless Sensor Networks  

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Full Text Available Wireless sensor network (WSN technology has promised fine grain monitoring in time and space as well as at a lower cost than is currently possible. These sensor networks are required to provide a robust service in hostile environments. Therefore the issue of real-time and reliable data delivery is extremely important for taking effective decisions in WSN. In this paper the architecture for reliable and real time approach by using sensor clusters has been proposed for storage management. Instead of storing information in an individual cluster head as suggested in some approaches, storing of information of all clusters, inside the cell is recommended within the corresponding base station. For data dissemination and action we have used Action and Relay Stations (ARS. We have developed programming model for formal specification and verification of our architecture.

Mayank DAVE

2010-01-01

186

Architecture Aware Key Management Scheme for Wireless Sensor Networks  

Directory of Open Access Journals (Sweden)

Full Text Available The emergence of wireless networking as well as the development in embedded systems and technologies have given birth to application specific networks called wireless sensor networks WSNs, their flexibility, facility of use and deployment as well as their low cost give them an increasing field of applications. Usually sensors are limited in capacities deployed in a hostile and unpredictable environment, making the security of these networks a challenging task. In this paper we are going to present a key management scheme in which the base station play the role of the secure third party responsible of distributing key and managing security in the network, two versions of this scheme are presented the first one for flat networks and the second one for hierarchical networks in which the cluster head play the key role in all key agreement with the base station.

Mohammed FEHAM

2012-11-01

187

Heterogeneous sensor networks: a bio-inspired overlay architecture  

Science.gov (United States)

Teledyne Scientific Company, the University of California at Santa Barbara (UCSB) and the Army Research Lab are developing technologies for automated data exfiltration from heterogeneous sensor networks through the Institute for Collaborative Biotechnologies (ICB). Unmanned air vehicles (UAV) provide an effective means to autonomously collect data from unattended ground sensors (UGSs) that cannot communicate with each other. UAVs are used to reduce the system reaction time by generating autonomous data-driven collection routes. Bio-inspired techniques for search provide a novel strategy to detect, capture and fuse data across heterogeneous sensors. A fast and accurate method has been developed for routing UAVs and localizing an event by fusing data from a sparse number of UGSs; it leverages a bio-inspired technique based on chemotaxis or the motion of bacteria seeking nutrients in their environment. The system was implemented and successfully tested using a high level simulation environment using a flight simulator to emulate a UAV. A field test was also conducted in November 2009 at Camp Roberts, CA using a UAV provided by AeroMech Engineering. The field test results showed that the system can detect and locate the source of an acoustic event with an accuracy of about 3 meters average circular error.

Burman, Jerry; Hespanha, Joao; Madhow, Upamanyu; Klein, Daniel; Isaacs, Jason; Venkateswaran, Sriram; Pham, Tien

2010-04-01

188

An Architecture for Performance Optimization in a Collaborative Knowledge-Based Approach for  Wireless Sensor Networks  

Directory of Open Access Journals (Sweden)

Full Text Available Over the past few years, Intelligent Spaces (ISs have received the attention of many Wireless Sensor Network researchers. Recently, several studies have been devoted to identify their common capacities and to set up ISs over these networks. However, little attention has been paid to integrating Fuzzy Rule-Based Systems into collaborative Wireless Sensor Networks for the purpose of implementing ISs. This work presents a distributed architecture proposal for collaborative Fuzzy Rule-Based Systems embedded in Wireless Sensor Networks, which has been designed to optimize the implementation of ISs. This architecture includes the following: (a an optimized design for the inference engine; (b a visual interface; (c a module to reduce the redundancy and complexity of the knowledge bases; (d a module to evaluate the accuracy of the new knowledge base; (e a module to adapt the format of the rules to the structure used by the inference engine; and (f a communications protocol. As a real-world application of this architecture and the proposed methodologies, we show an application to the problem of modeling two plagues of the olive tree: prays (olive moth, Prays oleae Bern. and repilo (caused by the fungus Spilocaea oleagina. The results show that the architecture presented in this paper significantly decreases the consumption of resources (memory, CPU and battery without a substantial decrease in the accuracy of the inferred values.

Juan Ramon Velasco

2011-09-01

189

An architecture for performance optimization in a collaborative knowledge-based approach for wireless sensor networks.  

Science.gov (United States)

Over the past few years, Intelligent Spaces (ISs) have received the attention of many Wireless Sensor Network researchers. Recently, several studies have been devoted to identify their common capacities and to set up ISs over these networks. However, little attention has been paid to integrating Fuzzy Rule-Based Systems into collaborative Wireless Sensor Networks for the purpose of implementing ISs. This work presents a distributed architecture proposal for collaborative Fuzzy Rule-Based Systems embedded in Wireless Sensor Networks, which has been designed to optimize the implementation of ISs. This architecture includes the following: (a) an optimized design for the inference engine; (b) a visual interface; (c) a module to reduce the redundancy and complexity of the knowledge bases; (d) a module to evaluate the accuracy of the new knowledge base; (e) a module to adapt the format of the rules to the structure used by the inference engine; and (f) a communications protocol. As a real-world application of this architecture and the proposed methodologies, we show an application to the problem of modeling two plagues of the olive tree: prays (olive moth, Prays oleae Bern.) and repilo (caused by the fungus Spilocaea oleagina). The results show that the architecture presented in this paper significantly decreases the consumption of resources (memory, CPU and battery) without a substantial decrease in the accuracy of the inferred values. PMID:22163687

Gadeo-Martos, Manuel Angel; Fernandez-Prieto, Jose Angel; Canada-Bago, Joaquin; Velasco, Juan Ramon

2011-01-01

190

Game and Balance Multicast Architecture Algorithms for Sensor Grid  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We propose a scheme to attain shorter multicast delay and higher efficiency in the data transfer of sensor grid. Our scheme, in one cluster, seeks the central node, calculates the space and the data weight vectors. Then we try to find a new vector composed by linear combination of the two old ones. We use the equal correlation coefficient between the new and old vectors to find the point of game and balance of the space and data factorsbuild a binary simple equation, seek linear parameters, a...

Vasilakos, Athanasios V.; Naixue Xiong; Frèdèric Magoulés; Qiongli Wu; Qingfeng Fan; Yanxiang He

2009-01-01

191

A new approach to architecture of sensor networks for mission-oriented applications  

Science.gov (United States)

In this paper, a novel mission-oriented sensor network architecture for military applications is proposed involving multiple sensing missions with varying quality of information (QoI) requirements. A new concept of mission QoI satisfaction index indicating the degree of satisfaction for any mission in the network is introduced. Furthermore, the 5WH (why, when, where, what, who, how) principle on the operational context of information is extended to capture the changes of QoI satisfaction indexes for mission admission and completion. These allow modeling the whole network as a "black box". With system inputs including the QoI requirements of the existing and newly arriving missions and output the QoI satisfaction index, the new concept of sensor network capacity is introduced and mathematically described. The QoI-centric sensor network capacity is a key element of the proposed architecture and aids controlling of admission of newly arriving missions in accordance with the QoI needs of all (existing and newly admitted missions). Finally, the proposed architecture and its key design parameters are illustrated through an example of a sensor network deployed for detecting the presence of a hazardous, chemical material.

Liu, Chi Harold; Leung, Kin K.; Bisdikian, Chatschik; Branch, Joel W.

2009-05-01

192

Application of Service Oriented Architecture for Sensors and Actuators in District Heating Substations  

Directory of Open Access Journals (Sweden)

Full Text Available Hardwired sensor installations using proprietary protocols found in today’s district heating substations limit the potential usability of the sensors in and around the substations. If sensor resources can be shared and re-used in a variety of applications, the cost of sensors and installation can be reduced, and their functionality and operability can be increased. In this paper, we present a new concept of district heating substation control and monitoring, where a service oriented architecture (SOA is deployed in a wireless sensor network (WSN, which is integrated with the substation. IP-networking is exclusively used from sensor to server; hence, no middleware is needed for Internet integration. Further, by enabling thousands of sensors with SOA capabilities, a System of Systems approach can be applied. The results of this paper show that it is possible to utilize SOA solutions with heavily resource-constrained embedded devices in contexts where the real-time constrains are limited, such as in a district heating substation.

Jonas Gustafsson

2014-08-01

193

Application of service oriented architecture for sensors and actuators in district heating substations.  

Science.gov (United States)

Hardwired sensor installations using proprietary protocols found in today's district heating substations limit the potential usability of the sensors in and around the substations. If sensor resources can be shared and re-used in a variety of applications, the cost of sensors and installation can be reduced, and their functionality and operability can be increased. In this paper, we present a new concept of district heating substation control and monitoring, where a service oriented architecture (SOA) is deployed in a wireless sensor network (WSN), which is integrated with the substation. IP-networking is exclusively used from sensor to server; hence, no middleware is needed for Internet integration. Further, by enabling thousands of sensors with SOA capabilities, a System of Systems approach can be applied. The results of this paper show that it is possible to utilize SOA solutions with heavily resource-constrained embedded devices in contexts where the real-time constrains are limited, such as in a district heating substation. PMID:25196165

Gustafsson, Jonas; Kyusakov, Rumen; Mäkitaavola, Henrik; Delsing, Jerker

2014-01-01

194

Modular Architecture for Sensor Systems (MASS): description, analysis, simulation, and implementation  

International Nuclear Information System (INIS)

A particular engineering aspect of distributed sensor networks that has not received adequate attention is the system level hardware architecture of the individual nodes of the network. A novel hardware architecture based on an idea of task specific modular computing is proposed to provide for both the high flexibility and low power consumption required for distributed sensing solutions. The power consumption of the architecture is mathematically analyzed against a traditional approach, and guidelines are developed for application scenarios that would benefit from using this new design. Furthermore a method of decentralized control for the modular system is developed and analyzed. Finally, a few policies for power minimization in the decentralized system are proposed and analyzed.

195

A Web-based DSS Architecture and its Forecasting Core in Supply Chain Management  

Directory of Open Access Journals (Sweden)

Full Text Available In a competitive market environment, supply chain management (SCM has been critical for companies to survive. Demand planning plays an important role in SCM, for it provides accurate demand forecasts which may achieve customer satisfaction by offering benefits such as low inventory level, short lead time, efficient resource allocation, and quick response. To obtain more accurate forecasts, this study presents a web-based Decision Support System (DSS architecture and its forecasting core. The forecasting core, named Panel Function, contains three modules: Segmentation Module, Forecasting Module, and Coordination Module. The Segmentation Module categorizes customers into three segments: Loyal Customer Segment, Potential Customer Segment, and Switcher Segment. Based on the three segments, the Forecasting Module employs different forecasting and analysis technologies to make an integrated forecast estimate: time-seriesforecasting to capture the loyal customer demand trend, Bayesian inference to estimate the predicted value of switcher purchase quantity, and questionnaire analysis and brand choicemodels to unearth potential customers. The results from these three processes are then synthesized to obtain the integrated forecast, which is then used in the Coordination Module as the base of distribution planning, and provides a minimal system-wide total costsolution for all parties in the supply chain. As a whole, this DSS architecture has been shown to provide an efficient mechanism for collaborative demand planning and help create the maximum profit for the supply chain.

Tien-You Wang

2009-06-01

196

Enviro-Net: From Networks of Ground-Based Sensor Systems to a Web Platform for Sensor Data Management  

Directory of Open Access Journals (Sweden)

Full Text Available Ecosystems monitoring is essential to properly understand their development and the effects of events, both climatological and anthropological in nature. The amount of data used in these assessments is increasing at very high rates. This is due to increasing availability of sensing systems and the development of new techniques to analyze sensor data. The Enviro-Net Project encompasses several of such sensor system deployments across five countries in the Americas. These deployments use a few different ground-based sensor systems, installed at different heights monitoring the conditions in tropical dry forests over long periods of time. This paper presents our experience in deploying and maintaining these systems, retrieving and pre-processing the data, and describes the Web portal developed to help with data management, visualization and analysis.

Mario A. Nascimento

2011-06-01

197

Enviro-Net: from networks of ground-based sensor systems to a Web platform for sensor data management.  

Science.gov (United States)

Ecosystems monitoring is essential to properly understand their development and the effects of events, both climatological and anthropological in nature. The amount of data used in these assessments is increasing at very high rates. This is due to increasing availability of sensing systems and the development of new techniques to analyze sensor data. The Enviro-Net Project encompasses several of such sensor system deployments across five countries in the Americas. These deployments use a few different ground-based sensor systems, installed at different heights monitoring the conditions in tropical dry forests over long periods of time. This paper presents our experience in deploying and maintaining these systems, retrieving and pre-processing the data, and describes the Web portal developed to help with data management, visualization and analysis. PMID:22163965

Pastorello, Gilberto Z; Sanchez-Azofeifa, G Arturo; Nascimento, Mario A

2011-01-01

198

A Simple Fiber Bragg Grating-Based Sensor Network Architecture with Self-Protecting and Monitoring Functions  

Directory of Open Access Journals (Sweden)

Full Text Available A novel fiber Bragg grating (FBG-based passive sensor architecture, which can be used to protect the fiber cut and monitor the multiple sensors simultaneously, is proposed and experimentally demonstrated. Here, we employ a wavelength-tunable erbium-doped fiber (EDF laser scheme with 25 km cavity length acting as the detecting light source in central office (CO. Each FBG sensor, serving as a feedback element, is used in proposed sensor architecture. By tuning the tunable bandpass filter (TBF placing inside cavity to match the corresponding Bragg wavelength of FBG over the amplification bandwidth, we can retrieve the related wavelength lasing for the FBG sensing and monitoring simultaneously. Moreover, the survivability and capacity of the passive FBG sensor architecture can be also enhanced.

Chien-Hung Yeh

2011-01-01

199

Architecture for biomedical multimedia information delivery on the World Wide Web  

Science.gov (United States)

Research engineers at the National Library of Medicine are building a prototype system for the delivery of multimedia biomedical information on the World Wide Web. This paper discuses the architecture and design considerations for the system, which will be used initially to make images and text from the third National Health and Nutrition Examination Survey (NHANES) publicly available. We categorized our analysis as follows: (1) fundamental software tools: we analyzed trade-offs among use of conventional HTML/CGI, X Window Broadway, and Java; (2) image delivery: we examined the use of unconventional TCP transmission methods; (3) database manager and database design: we discuss the capabilities and planned use of the Informix object-relational database manager and the planned schema for the HNANES database; (4) storage requirements for our Sun server; (5) user interface considerations; (6) the compatibility of the system with other standard research and analysis tools; (7) image display: we discuss considerations for consistent image display for end users. Finally, we discuss the scalability of the system in terms of incorporating larger or more databases of similar data, and the extendibility of the system for supporting content-based retrieval of biomedical images. The system prototype is called the Web-based Medical Information Retrieval System. An early version was built as a Java applet and tested on Unix, PC, and Macintosh platforms. This prototype used the MiniSQL database manager to do text queries on a small database of records of participants in the second NHANES survey. The full records and associated x-ray images were retrievable and displayable on a standard Web browser. A second version has now been built, also a Java applet, using the MySQL database manager.

Long, L. Rodney; Goh, Gin-Hua; Neve, Leif; Thoma, George R.

1997-10-01

200

Data Optical Networking Architecture Using Wavelength-Division Multiplexing Method for Optical Sensors  

Science.gov (United States)

Recently there has been a growth in the number of fiber optical sensors used for health monitoring in the hostile environment of commercial aircraft. Health monitoring to detect the onset of failure in structural systems from such causes as corrosion, stress corrosion cracking, and fatigue is a critical factor in safety as well in aircraft maintenance costs. This report presents an assessment of an analysis model of optical data networking architectures used for monitoring data signals among these optical sensors. Our model is focused on the design concept of the wavelength-division multiplexing (WDM) method since most of the optical sensors deployed in the aircraft for health monitoring typically operate in a wide spectrum of optical wavelengths from 710 to 1550 nm.

Nguyen, Hung D.

2008-01-01

 
 
 
 
201

FlexiSec: A Configurable Link Layer Security Architecture for Wireless Sensor Networks  

CERN Document Server

Ensuring communications security in Wireless Sensor Networks (WSNs) indeed is critical; due to the criticality of the resources in the sensor nodes as well as due to their ubiquitous and pervasive deployment, with varying attributes and degrees of security required. The proliferation of the next generation sensor nodes, has not solved this problem, because of the greater emphasis on low-cost deployment. In addition, the WSNs use data-centric multi-hop communication that in turn, necessitates the security support to be devised at the link layer (increasing the cost of security related operations), instead of being at the application layer, as in general networks. Therefore, an energy-efficient link layer security framework is necessitated. There do exists a number of link layer security architectures that offer some combinations of the security attributes desired by different WSN applications. However, as we show in this paper, none of them is responsive to the actual security demands of the applications. Ther...

Jinwala, Devesh; Dasgupta, Kankar

2012-01-01

202

A Multi-Robot Control Architecture for Fault-Tolerant Sensor-Based Coverage  

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Full Text Available Sensor-based coverage problems have many applications such as patrolling, search-rescue, and surveillance. Using multi-robot team increases efficiency by reducing completion time of a sensor-based coverage task. Robustness to robot failures is another advantage of using multiple robots for coverage. Although there are many works to increase the efficiency of coverage methods, there are few works related to robot failures in the literature. In this paper, fault-tolerant control architecture is proposed for sensor-based coverage. Robot failures are detected using the heartbeat strategy. To show the effectiveness of the proposed approach, experiments are conducted using P3-DX mobile robots both in laboratory and simulation environment.

Metin Ozkan

2010-02-01

203

Active pixel sensor architectures in a-SiH for medical imaging  

International Nuclear Information System (INIS)

The most widely used architecture in large area amorphous silicon (a-Si) flat panel imagers is the passive pixel sensor (PPS), which consists of a detector and a readout switch. While the PPS has the advantage of being compact and amenable towards high-resolution imaging, reading the low PPS output signal requires external circuitry such as column charge amplifiers that produce additional noise and reduce the minimum readable sensor input signal. This work presents a voltage mediated active pixel sensor (APS) on-pixel readout circuit for diagnostic medical imaging to minimize external component count and hence external readout noise sources. Preliminary results indicate excellent APS linearity along with a pixel readout time suitable for mammography or radiography

204

Adaptive Fault Detection on Liquid Propulsion Systems with Virtual Sensors: Algorithms and Architectures  

Science.gov (United States)

Prior to the launch of STS-119 NASA had completed a study of an issue in the flow control valve (FCV) in the Main Propulsion System of the Space Shuttle using an adaptive learning method known as Virtual Sensors. Virtual Sensors are a class of algorithms that estimate the value of a time series given other potentially nonlinearly correlated sensor readings. In the case presented here, the Virtual Sensors algorithm is based on an ensemble learning approach and takes sensor readings and control signals as input to estimate the pressure in a subsystem of the Main Propulsion System. Our results indicate that this method can detect faults in the FCV at the time when they occur. We use the standard deviation of the predictions of the ensemble as a measure of uncertainty in the estimate. This uncertainty estimate was crucial to understanding the nature and magnitude of transient characteristics during startup of the engine. This paper overviews the Virtual Sensors algorithm and discusses results on a comprehensive set of Shuttle missions and also discusses the architecture necessary for deploying such algorithms in a real-time, closed-loop system or a human-in-the-loop monitoring system. These results were presented at a Flight Readiness Review of the Space Shuttle in early 2009.

Matthews, Bryan L.; Srivastava, Ashok N.

2010-01-01

205

An Ontological Approach to Representing and Reasoning about Events in the Sensor Web  

Science.gov (United States)

While observations are fed into the Sensor Web through a growing number of environmental sensors, the challenge is to infer information about geographic events they reflect. For example, we may ask what the measurements mean when a service compiles hourly wind speeds from different providers. The service should perhaps include meaningful descriptions than just the measurements; for instance, whether the wind occurring at a particular site is nearly calm or reflects a windstorm. Similarly, we may want to know the intensity of a snowfall occurrence from a series of visibility measurements supplied by a visibility sensor. A systematic approach representing domain knowledge is vital when reasoning about events at the conceptual level. A description of how one gets from observations to inferred events must be expressed. Environmental models usually capture such information. Nonetheless, they jeopardize transparency; the information contained within these models is implicit, limited to domain experts, and hard to acquire or manipulate. The formal specifications in the Semantic Sensor Web primarily describe sensors and observations; they do not describe information concerning geographic events. Existing event-oriented ontologies represent common concepts concerning events, e.g., participant, time, location and relations between events. Nevertheless, the event-of-interest is not explicitly associated with sensing concepts such as observation event, sensor and result. This paper delivers an ontology to formally capture the relations between observations and geographic events. The ontology constitutes common building blocks for constructing application ontologies that account for inferences of the former from the latter. The formal vocabularies are exploited with a rule-based mechanism to support inferences of events from in-situ observations. The paper also demonstrates how these vocabularies are used to formulate symbolic spatio-temporal queries in the Sensor Web. A use case for reasoning about blizzards and their temporal parts from time series supplied by the Environment Canada illustrates the ontological approach.

Devaraju, Anusuriya

2013-04-01

206

A FPGA Embedded Web Server for Remote Monitoring and Control of Smart Sensors Networks  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This article describes the implementation of a web server using an embedded Altera NIOS II IP core, a general purpose and configurable RISC processor which is embedded in a Cyclone FPGA. The processor uses the ?CLinux operating system to support a Boa web server of dynamic pages using Common Gateway Interface (CGI). The FPGA is configured to act like the master node of a network, and also to control and monitor a network of smart sensors or instruments. In order to develop a totally function...

Eduardo Magdaleno; Manuel Rodríguez; Fernando Pérez; David Hernández; Enrique García

2013-01-01

207

A wireless soil moisture smart sensor web using physics-based optimal control: Concept and initial demonstrations  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper introduces a new concept for a smart wireless sensor web technology for optimal measurements of surface-to-depth profiles of soil moisture using in-situ sensors. The objective of the technology, supported by the NASA Earth Science Technology Office Advanced Information Systems Technology program, is to enable a guided and adaptive sampling strategy for the in-situ sensor network to meet the measurement validation objectives of spaceborne soil moisture sensors. A potential applicati...

Moghaddam, Mahta; Entekhabi, Dara; Goykhman, Yuriy; Li, Ke; Liu, Mingyan; Mahajan, Aditya; Nayyar, Ashutosh; Shuman, David; Teneketzis, Demosthenis

2010-01-01

208

?Re- Using an Existing Wheel? Developing Data Architecture for Cooperating Autonomous and Semi-Autonomous, Agent-Based Web Services  

Directory of Open Access Journals (Sweden)

Full Text Available This short position paper considers issues in developing Data Architecture for the Internet of Things (IoT through the medium of an exemplar project, Domain Expertise Capture in Authoring and Development -Environments (DECADE. A brief discussion sets the background for IoT, and the development of the -distinction between things and computers. The paper makes a strong argument to avoid reinvention of the wheel, and to reuse approaches to distributed heterogeneous data architectures and the lessons learned from that work, and apply them to this situation. DECADE requires an autonomous recording system, -local data storage, semi-autonomous verification model, sign-off mechanism, qualitative and -quantitative -analysis -carried out when and where required through web-service architecture, based on ontology and analytic agents, with a self-maintaining ontology model. To develop this, we describe a web-service -architecture, -combining a distributed data warehouse, web services for analysis agents, ontology agents and a -verification engine, with a centrally verified outcome database maintained by certifying body for qualification/-professional status.

MacKinnon Lachlan

2009-01-01

209

Architecture Supporting Discovery and Management of Heterogeneous Sensors for Smart System Using Generic Middleware  

Directory of Open Access Journals (Sweden)

Full Text Available This Smart environments, starting from smart home to more complex one like smart city, demand efficientinteroperation mechanism among different heterogeneous sensors including the discovery and themanagement of these devices. The diverse domains of applications also require interoperation amongthemselves. The middleware plays a key role to achieve this interoperation. The middleware is alsoresponsible for providing abstractions to the application interfaces and device sensing. In the currentarticle middleware architecture along with a method for efficient device interoperation by generating ageneric device attributes (GDA structure is presented. The middleware performs semantic analysis onthe content of the device attributes while performing the discovery and managing the device. It supports,efficient way of sensor discovery, management and posting of sensed data. Smart irrigation and firmingenvironment is considered as a use case here. The presented architecture is modular, based on objectoriented concept and generic in nature. This can be further extended for any smart system. A futureresearch scope of the proposed architecture is also discussed while concluding the article.

Soma Bandyopadhyay

2012-10-01

210

High performance architecture design for large scale fibre-optic sensor arrays using distributed EDFAs and hybrid TDM/DWDM  

Science.gov (United States)

A distributed amplified dense wavelength division multiplexing (DWDM) array architecture is presented for interferometric fibre-optic sensor array systems. This architecture employs a distributed erbium-doped fibre amplifier (EDFA) scheme to decrease the array insertion loss, and employs time division multiplexing (TDM) at each wavelength to increase the number of sensors that can be supported. The first experimental demonstration of this system is reported including results which show the potential for multiplexing and interrogating up to 4096 sensors using a single telemetry fibre pair with good system performance. The number can be increased to 8192 by using dual pump sources.

Liao, Yi; Austin, Ed; Nash, Philip J.; Kingsley, Stuart A.; Richardson, David J.

2013-09-01

211

An Energy-Efficient and High-Quality Video Transmission Architecture in Wireless Video-Based Sensor Networks  

Directory of Open Access Journals (Sweden)

Full Text Available Technological progress in the fields of Micro Electro-Mechanical Systems (MEMS and wireless communications and also the availability of CMOS cameras, microphones and small-scale array sensors, which may ubiquitously capture multimedia content from the field, have fostered the development of low-cost limited resources Wireless Video-based Sensor Networks (WVSN. With regards to the constraints of videobased sensor nodes and wireless sensor networks, a supporting video stream is not easy to implement with the present sensor network protocols. In this paper, a thorough architecture is presented for video transmission over WVSN called Energy-efficient and high-Quality Video transmission Architecture (EQV-Architecture. This architecture influences three layers of communication protocol stack and considers wireless video sensor nodes constraints like limited process and energy resources while video quality is preserved in the receiver side. Application, transport, and network layers are the layers in which the compression protocol, transport protocol, and routing protocol are proposed respectively, also a dropping scheme is presented in network layer. Simulation results over various environments with dissimilar conditions revealed the effectiveness of the architecture in improving the lifetime of the network as well as preserving the video quality.

Yasaman Samei

2008-08-01

212

A Unique Design based Processing Layer for Modular Architecture in Wireless Sensor Networks and its Applications  

Directory of Open Access Journals (Sweden)

Full Text Available The growth of sensor networks during the last years is a fact and within this field, wireless sensor networks are growing particularly as there are many applications that demand the use of many nodes(also called as mote, even hundreds or thousands. More and more applications are emerging to solve several problems in data acquisition and control in different environments, taking advantage of this technology. In this context, hardware design of the sensor network node becomes critical to satisfy the hard constraints imposed by wireless sensor networks, like low power consumption, low size and low cost. Moreover, these nodes must be capable of sensing, processing and communicating physical parameters, becoming true smart sensors in a network. With this goal in mind, we propose a modular architecture for the nodes, composed of four layers: communication, processing, power supply and sensing. The purpose is to minimize the redesign effort as well as to make the node flexible and adaptable to many different applications. In a first prototype of the node, we present a node with a mixed design based on a microcontroller and an FPGA for the processing layer and Bluetooth technology for communications.

Guttikonda Chaitra Bharati#1 , Akkela Ramakrishna *2 , Chagamreddy Jhansi #3 , K.Ajay Reddy$

2013-03-01

213

Geospatial web services for limnological data: a case study of sensor observation service for ecological observations  

Science.gov (United States)

The present work aims at designing and implementing a spatial data infrastructure for storing and sharing ecological data through geospatial web services. As case study, we concentrated on limnological data coming from the drainage basin of Lake Maggiore in the Northern of Italy. In order to establish the infrastructure, we started with two basic questions: (1) What type of data is the ecological dataset? (2) Which are the geospatial web services standards most suitable to store and share ecological data? In this paper we describe the possibilities for sharing ecological data using geospatial web services and the difficulties that can be encountered in this task. In order to test actual technological solutions, we use real data of a limnological published study.We concluded that limnological data can be considered observational data, composed by biological (species) data and environmental data, and it can be modeled using Observation and Measurement (O&M) specification. With the actual web service implementation the geospatial web services that could potentially be used to publish limnological data are Sensor Observation Services (SOS) and Web Feature Services (WFS). SOS holds the essential components to represent time series observations, while WFS is a simple model that requires profiling. Both, SOS and WFS are not perfectly suitable to publish biological data, so other alternatives must be considered, as linked data.

Arias Muñoz, C.; Oggioni, A.; Brovelli, M. A.

2014-04-01

214

Sensors | Special Issue : Ambient Assisted Living (AAL): Sensors, Architectures and Applications  

... Open Access Article: A Smart Kitchen for Ambient Assisted Living by Rubén Blasco, Álvaro Marco, Roberto Casas, Diego Cirujano and Richard Picking Sensors 2014, 14(1), 1629-1653; doi:10.3390/s140101629 Received: 8 October 2013; in revised form: 23 December 2013 / Accepted: 9 January 2014 / Published: 17 January 2014 Show/Hide Abstract | Download PDF Full-text (2858 KB) | Download XML Full-text Abstract: The kitchen environment is one of the scenarios in the home ...

215

ESB-Based Sensor Web Integration for the Prediction of Electric Power Supply System Vulnerability  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Electric power supply companies increasingly rely on enterprise IT systems to provide them with a comprehensive view of the state of the distribution network. Within a utility-wide network, enterprise IT systems collect data from various metering devices. Such data can be effectively used for the prediction of power supply network vulnerability. The purpose of this paper is to present the Enterprise Service Bus (ESB)-based Sensor Web integration solution that we have developed with the purpos...

Milos Bogdanovic; Leonid Stoimenov; Sanja Bogdanovic-Dinic

2013-01-01

216

LIDeA: A Distributed Lightweight Intrusion Detection Architecture for Sensor Networks  

DEFF Research Database (Denmark)

Wireless sensor networks are vulnerable to adversaries as they are frequently deployed in open and unattended environments. Preventive mechanisms can be applied to protect them from an assortment of attacks. However, more sophisticated methods, like intrusion detection systems, are needed to achieve a more autonomic and complete defense mechanism, even against attacks that have not been anticipated in advance. In this paper, we present a lightweight intrusion detection system, called LIDeA, designed for wireless sensor networks. LIDeA is based on a distributed architecture, in which nodes overhear their neighboring nodes and collaborate with each other in order to successfully detect an intrusion. We show how such a system can be implemented in TinyOS, which components and interfaces are needed, and what is the resulting overhead imposed.

Giannetsos, Athanasios; Krontiris, Ioannis

2008-01-01

217

A smart sensor architecture based on emergent computation in an array of outer-totalistic cells  

Science.gov (United States)

A novel smart-sensor architecture is proposed, capable to segment and recognize characters in a monochrome image. It is capable to provide a list of ASCII codes representing the recognized characters from the monochrome visual field. It can operate as a blind's aid or for industrial applications. A bio-inspired cellular model with simple linear neurons was found the best to perform the nontrivial task of cropping isolated compact objects such as handwritten digits or characters. By attaching a simple outer-totalistic cell to each pixel sensor, emergent computation in the resulting cellular automata lattice provides a straightforward and compact solution to the otherwise computationally intensive problem of character segmentation. A simple and robust recognition algorithm is built in a compact sequential controller accessing the array of cells so that the integrated device can provide directly a list of codes of the recognized characters. Preliminary simulation tests indicate good performance and robustness to various distortions of the visual field.

Dogaru, Radu; Dogaru, Ioana; Glesner, Manfred

2005-06-01

218

Monitoring Architectural Heritage by Wireless Sensors Networks: San Gimignano — A Case Study  

Directory of Open Access Journals (Sweden)

Full Text Available This paper describes a wireless sensor network (WSN used to monitor the health state of architectural heritage in real-time. The WSN has been deployed and tested on the “Rognosa” tower in the medieval village of San Gimignano, Tuscany, Italy. This technology, being non-invasive, mimetic, and long lasting, is particularly well suited for long term monitoring and on-line diagnosis of the conservation state of heritage buildings. The proposed monitoring system comprises radio-equipped nodes linked to suitable sensors capable of monitoring crucial parameters like: temperature, humidity, masonry cracks, pouring rain, and visual light. The access to data is granted by a user interface for remote control. The WSN can autonomously send remote alarms when predefined thresholds are reached.

Alessandro Mecocci

2014-01-01

219

Solving graph data issues using a layered architecture approach with applications to web spam detection.  

Science.gov (United States)

This paper proposes the combination of two state-of-the-art algorithms for processing graph input data, viz., the probabilistic mapping graph self organizing map, an unsupervised learning approach, and the graph neural network, a supervised learning approach. We organize these two algorithms in a cascade architecture containing a probabilistic mapping graph self organizing map, and a graph neural network. We show that this combined approach helps us to limit the long-term dependency problem that exists when training the graph neural network resulting in an overall improvement in performance. This is demonstrated in an application to a benchmark problem requiring the detection of spam in a relatively large set of web sites. It is found that the proposed method produces results which reach the state of the art when compared with some of the best results obtained by others using quite different approaches. A particular strength of our method is its applicability towards any input domain which can be represented as a graph. PMID:23973870

Scarselli, Franco; Tsoi, Ah Chung; Hagenbuchner, Markus; Noi, Lucia Di

2013-12-01

220

Single-photon sampling architecture for solid-state imaging sensors.  

Science.gov (United States)

Advances in solid-state technology have enabled the development of silicon photomultiplier sensor arrays capable of sensing individual photons. Combined with high-frequency time-to-digital converters (TDCs), this technology opens up the prospect of sensors capable of recording with high accuracy both the time and location of each detected photon. Such a capability could lead to significant improvements in imaging accuracy, especially for applications operating with low photon fluxes such as light detection and ranging and positron-emission tomography. The demands placed on on-chip readout circuitry impose stringent trade-offs between fill factor and spatiotemporal resolution, causing many contemporary designs to severely underuse the technology's full potential. Concentrating on the low photon flux setting, this paper leverages results from group testing and proposes an architecture for a highly efficient readout of pixels using only a small number of TDCs. We provide optimized design instances for various sensor parameters and compute explicit upper and lower bounds on the number of TDCs required to uniquely decode a given maximum number of simultaneous photon arrivals. To illustrate the strength of the proposed architecture, we note a typical digitization of a 60 × 60 photodiode sensor using only 142 TDCs. The design guarantees registration and unique recovery of up to four simultaneous photon arrivals using a fast decoding algorithm. By contrast, a cross-strip design requires 120 TDCs and cannot uniquely decode any simultaneous photon arrivals. Among other realistic simulations of scintillation events in clinical positron-emission tomography, the above design is shown to recover the spatiotemporal location of 99.98% of all detected photons. PMID:23836643

van den Berg, Ewout; Candès, Emmanuel; Chinn, Garry; Levin, Craig; Olcott, Peter Demetri; Sing-Long, Carlos

2013-07-23

 
 
 
 
221

Rapid EHR development and implementation using web and cloud-based architecture in a large home health and hospice organization.  

Science.gov (United States)

Health care organizations have long been limited to a small number of major vendors in their selection of an electronic health record (EHR) system in the national and international marketplace. These major EHR vendors have in common base systems that are decades old, are built in antiquated programming languages, use outdated server architecture, and are based on inflexible data models [1,2]. The option to upgrade their technology to keep pace with the power of new web-based architecture, programming tools and cloud servers is not easily undertaken due to large client bases, development costs and risk [3]. This paper presents the decade-long efforts of a large national provider of home health and hospice care to select an EHR product, failing that to build their own and failing that initiative to go back into the market in 2012. The decade time delay had allowed new technologies and more nimble vendors to enter the market. Partnering with a new start-up company doing web and cloud based architecture for the home health and hospice market, made it possible to build, test and implement an operational and point of care system in 264 home health locations across 40 states and three time zones in the United States. This option of "starting over" with the new web and cloud technologies may be posing a next generation of new EHR vendors that retells the Blackberry replacement by iPhone story in healthcare. PMID:24943570

Weaver, Charlotte A; Teenier, Pamela

2014-01-01

222

Designing an architecture for monitoring patients at home: ontologies and web services for clinical and technical management integration.  

Science.gov (United States)

This paper presents the design and implementation of an architecture based on the combination of ontologies, rules, web services, and the autonomic computing paradigm to manage data in home-based telemonitoring scenarios. The architecture includes two layers: 1) a conceptual layer and 2) a data and communication layer. On the one hand, the conceptual layer based on ontologies is proposed to unify the management procedure and integrate incoming data from all the sources involved in the telemonitoring process. On the other hand, the data and communication layer based on REST web service (WS) technologies is proposed to provide practical backup to the use of the ontology, to provide a real implementation of the tasks it describes and thus to provide a means of exchanging data (support communication tasks). A case study regarding chronic obstructive pulmonary disease data management is presented in order to evaluate the efficiency of the architecture. This proposed ontology-based solution defines a flexible and scalable architecture in order to address main challenges presented in home-based telemonitoring scenarios and thus provide a means to integrate, unify, and transfer data supporting both clinical and technical management tasks. PMID:24108483

Lasierra, Nelia; Alesanco, Álvaro; García, José

2014-05-01

223

Framework for Testing Web Services Through SOA(Service Oriented Architecture  

Directory of Open Access Journals (Sweden)

Full Text Available In today’s connected e-world Web Services is arguably the most popular and powerful software technology. This paper focuses on web services and also the various standards that have evolved over the years, such as XML, SOAP, WSDL, and UDDI. This paper advocates the need for testing web services as testingweb services poses a big challenge to testing professionals because of its inherently complex and distributed nature. Web Service Automated Testing Utility will enable us to locate and invoke web service methods directly. It supports all of the core Web service technologies like WDSL, SOAP, and it is an ideal Web service tool for testing Web services, inspecting WSDL files, automating or accelerating verification of each component when developing Web service enabled applications.

Y.Prasanth1,V.Sarika, D.Santhosh Anuhya, Y.Vineela , A. Ajay Babu

2012-04-01

224

The Telesupervised Adaptive Ocean Sensor Fleet (TAOSF) Architecture: Coordination of Multiple Oceanic Robot Boats  

Science.gov (United States)

Earth science research must bridge the gap between the atmosphere and the ocean to foster understanding of Earth s climate and ecology. Ocean sensing is typically done with satellites, buoys, and crewed research ships. The limitations of these systems include the fact that satellites are often blocked by cloud cover, and buoys and ships have spatial coverage limitations. This paper describes a multi-robot science exploration software architecture and system called the Telesupervised Adaptive Ocean Sensor Fleet (TAOSF). TAOSF supervises and coordinates a group of robotic boats, the OASIS platforms, to enable in-situ study of phenomena in the ocean/atmosphere interface, as well as on the ocean surface and sub-surface. The OASIS platforms are extended deployment autonomous ocean surface vehicles, whose development is funded separately by the National Oceanic and Atmospheric Administration (NOAA). TAOSF allows a human operator to effectively supervise and coordinate multiple robotic assets using a sliding autonomy control architecture, where the operating mode of the vessels ranges from autonomous control to teleoperated human control. TAOSF increases data-gathering effectiveness and science return while reducing demands on scientists for robotic asset tasking, control, and monitoring. The first field application chosen for TAOSF is the characterization of Harmful Algal Blooms (HABs). We discuss the overall TAOSF architecture, describe field tests conducted under controlled conditions using rhodamine dye as a HAB simulant, present initial results from these tests, and outline the next steps in the development of TAOSF.

Elfes, Alberto; Podnar, Gregg W.; Dolan, John M.; Stancliff, Stephen; Lin, Ellie; Hosler, Jeffrey C.; Ames, Troy J.; Higinbotham, John; Moisan, John R.; Moisan, Tiffany A.; Kulczycki, Eric A.

2008-01-01

225

Three-dimensional spider-web architecture assembled from Na2Ti3O7 nanotubes as a high performance anode for a sodium-ion battery.  

Science.gov (United States)

A Na2Ti3O7 nanotube-assembled three-dimensional spider-web architecture is synthesized using a hydrothermal method. The self-similar network architecture exhibits an excellent performance as an anode for a room temperature sodium ion battery without any additives (e.g. binder, conducting agent) for the first time. PMID:25268774

Zhang, Yuping; Guo, Lin; Yang, Shihe

2014-10-16

226

Optical Flow in a Smart Sensor Based on Hybrid Analog-Digital Architecture  

Directory of Open Access Journals (Sweden)

Full Text Available The purpose of this study is to develop a motion sensor (delivering optical flow estimations using a platform that includes the sensor itself, focal plane processing resources, and co-processing resources on a general purpose embedded processor. All this is implemented on a single device as a SoC (System-on-a-Chip. Optical flow is the 2-D projection into the camera plane of the 3-D motion information presented at the world scenario. This motion representation is widespread well-known and applied in the science community to solve a wide variety of problems. Most applications based on motion estimation require work in real-time; hence, this restriction must be taken into account. In this paper, we show an efficient approach to estimate the motion velocity vectors with an architecture based on a focal plane processor combined on-chip with a 32 bits NIOS II processor. Our approach relies on the simplification of the original optical flow model and its efficient implementation in a platform that combines an analog (focal-plane and digital (NIOS II processor. The system is fully functional and is organized in different stages where the early processing (focal plane stage is mainly focus to pre-process the input image stream to reduce the computational cost in the post-processing (NIOS II stage. We present the employed co-design techniques and analyze this novel architecture. We evaluate the system’s performance and accuracy with respect to the different proposed approaches described in the literature. We also discuss the advantages of the proposed approach as well as the degree of efficiency which can be obtained from the focal plane processing capabilities of the system. The final outcome is a low cost smart sensor for optical flow computation with real-time performance and reduced power consumption that can be used for very diverse application domains.

Pablo Guzmán

2010-03-01

227

Coastal Ocean Observing Network - Open Source Architecture for Data Management and Web-Based Data Services  

Science.gov (United States)

The observations from the oceans are the backbone for any kind of operational services, viz. potential fishing zone advisory services, ocean state forecast, storm surges, cyclones, monsoon variability, tsunami, etc. Though it is important to monitor open Ocean, it is equally important to acquire sufficient data in the coastal ocean through coastal ocean observing systems for re-analysis, analysis and forecast of coastal ocean by assimilating different ocean variables, especially sub-surface information; validation of remote sensing data, ocean and atmosphere model/analysis and to understand the processes related to air-sea interaction and ocean physics. Accurate information and forecast of the state of the coastal ocean at different time scales is vital for the wellbeing of the coastal population as well as for the socio-economic development of the country through shipping, offshore oil and energy etc. Considering the importance of ocean observations in terms of understanding our ocean environment and utilize them for operational oceanography, a large number of platforms were deployed in the Indian Ocean including coastal observatories, to acquire data on ocean variables in and around Indian Seas. The coastal observation network includes HF Radars, wave rider buoys, sea level gauges, etc. The surface meteorological and oceanographic data generated by these observing networks are being translated into ocean information services through analysis and modelling. Centralized data management system is a critical component in providing timely delivery of Ocean information and advisory services. In this paper, we describe about the development of open-source architecture for real-time data reception from the coastal observation network, processing, quality control, database generation and web-based data services that includes on-line data visualization and data downloads by various means.

Pattabhi Rama Rao, E.; Venkat Shesu, R.; Udaya Bhaskar, T. V. S.

2012-07-01

228

An Analytical Approach for Optimal Clustering Architecture for Maximizing Lifetime in Large Scale Wireless Sensor Networks  

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Full Text Available Many methods have been researched to prolong sensor network lifetime using mobile technologies. In the mobile sink research, there are the track based methods and the anchor points based methods as representative operation methods for mobile sinks. However, the existing methods decrease Quality of Service (QoS and lead the routing hotspot in the vicinity of the mobile sink. In large scale wireless sensor networks, clustering is an effective technique for the purpose of improving the utilization of limited energy and prolonging the network lifetime. However, the problem of unbalanced energy dissipation exists in the multi-hop clustering model, where the cluster heads closer to the sink have to relay heavier traffic and consume more energy than farther nodes. In this paper we analyze several aspects based on the optimal clustering architecture for maximizing lifetime for large scale wireless sensor network. We also provide some analytical concepts for energy-aware head rotation and routing protocols to further balance the energy consumption among all nodes.

Yogesh Rai

2011-09-01

229

Framework for Testing Web Services Through SOA(Service Oriented Architecture)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In today’s connected e-world Web Services is arguably the most popular and powerful software technology. This paper focuses on web services and also the various standards that have evolved over the years, such as XML, SOAP, WSDL, and UDDI. This paper advocates the need for testing web services as testingweb services poses a big challenge to testing professionals because of its inherently complex and distributed nature. Web Service Automated Testing Utility will enable us to locate and invok...

Y Prasanth, V. Sarika

2012-01-01

230

Semantics empowered web 3.0 managing enterprise, social, sensor, and cloud-based data and services for advanced applications  

CERN Document Server

After the traditional document-centric Web 1.0 and user-generated content focused Web 2.0, Web 3.0 has become a repository of an ever growing variety of Web resources that include data and services associated with enterprises, social networks, sensors, cloud, as well as mobile and other devices that constitute the Internet of Things. These pose unprecedented challenges in terms of heterogeneity (variety), scale (volume), and continuous changes (velocity), as well as present corresponding opportunities if they can be exploited. Just as semantics has played a critical role in dealing with data h

Sheth, Amit

2012-01-01

231

Layered Ontological Modelling for Web Service-oriented Model-Driven Architecture  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Modelling is recognised as an essential activity in the architectural design of software systems. Model-driven architecture (MDA) is a framework implementing this idea. Ontologies are knowledge representation frameworks that are ideally suited to support modelling in this endeavour. We propose here a layered ontological framework that addresses domain modelling, architectural modelling, and interoperability aspects in the development of service-based software systems. We ...

Pahl, Claus

2005-01-01

232

Sensors  

Science.gov (United States)

Electronic sensors exist in many facets of our lives, from measuring operating conditions of our vehicles to adjusting the temperature of our homes. They can even mean the difference between life and death when used to monitor patients in emergency rooms. Even though sensors work transparently in their multitude of functions, their importance cannot be understated.Sensorland (1) has basic descriptions of a wide variety of sensors and related concepts. Out of the 50 items in the list, some have full technical reports that explain physical processes, while others consist of succinct explanations of a device's operation. The site covers sensors that measure everything from atmospheric pressure to the pH value of liquid solutions. In September 2002, the US Army conducted exercises using the zNose, a sensor that can quickly and quantitatively analyze any smell or vapor. This paper (2) provides a complete technical description of the zNose. Several more documents, including the press release of the Army's use of the device, can be found on the Electronic Sensor Technology homepage. In a related story from Sandia National Laboratories, the SnifferSTAR (3) could be especially useful in case of a terrorist gas attack. The short article briefly discusses how the invention works, with an emphasis on its characteristics of low power consumption and rapid analysis. Environmental Research Aircraft and Sensor Technology (4) is a NASA program to develop unmanned aerial vehicles capable of conducting advanced scientific studies. A number of aircraft are highlighted on the program's Web site, many of which are designed for long-term flights or potentially dangerous missions. The February 2003 cover story of Sensors magazine (5) is inertial sensing technology made from microelectromechanical systems (MEMS). The article discusses the applications of MEMS in accelerometers and gyroscopes, as well as explaining some of the theory behind these devices. A streaming video presentation, given in May 2002, can be viewed from this site (6). The hour-long talk introduces Sensor Webs, a network of tiny sensors connected by wireless technology that can be scattered over a large area to gather scientific data. Sensors can even be used in performing arts, as is shown in this paper from the Massachusetts Institute of Technology Media Lab (7). The authors propose using motion sensors to monitor hundreds of performers simultaneously, thereby allowing for much improved lighting and music responses. In the wake of the Space Shuttle Columbia tragedy, a great deal of attention was given to the intermittent and failing sensors on the shuttle minutes before it broke apart. This document from NASA shows the status of several sensors at various intervals in the shuttle's decent (8).

Leske, Cavin.

2003-01-01

233

Evolving Wireless Sensor Network Behavior Through Adaptability Points in Middleware Architectures  

Directory of Open Access Journals (Sweden)

Full Text Available Reflection has been proven to be a powerful mechanism to address software adaptation in middleware architectures; however this concept requires that the middleware be open and that modification of all of its functionality and behavior be possible. This leads to systems which are difficult to understand and may quickly overwhelm developers. Safer and more understandable approaches use modeling and put forth a partial implementation of reflective principles while limiting the possible scope of modification, as with translucent middleware. We consider that given the resource constraints in a Wireless Sensor Network (WSNs it is preferable to limit reflective features in order to conserve computational cycles and reduce network traffic. Additionally we do not believe all modifications lie within the concerns of the application developer and we introduce a separation of operational concerns that maps different modification responsibilities and levels of abstractions to different operational roles. We introduce a middleware architecture that provides strategy-controlled adaptability points; which are available to modify the behavior of the middleware's primary functionality. We have evaluated our approach through the implementation of a proof of concept prototype that supportsan industrial use case in the logistics domain and aneed-for-change scenario in the middleware's capacity planning functionality. Results demonstrate how changes in business requirements may be effectively supported through the introduction of adaptability points.

Sam Michiels

2011-08-01

234

An International Disaster Management SensorWeb Consisting of Space-based and Insitu Sensors  

Science.gov (United States)

For the past year, NASA along with partners consisting of the United Nations Space-based Information for Disaster and Emergency Response (UN-SPIDER) office, the Canadian Space Agency, the Ukraine Space Research Institute (SRI), Taiwan National Space Program Office (NSPO) and in conjunction with the Committee on Earth Observing Satellite (CEOS) Working Group on Information Systems and Services (WGISS) have been conducting a pilot project to automate the process of obtaining sensor data for the purpose of flood management and emergency response. This includes experimenting with flood prediction models based on numerous meteorological satellites and a global hydrological model and then automatically triggering follow up high resolution satellite imagery with rapid delivery of data products. This presentation will provide a overview of the effort, recent accomplishments and future plans.

Mandl, D.; Frye, S. W.; Policelli, F. S.; Cappelaere, P. G.

2009-12-01

235

Food Web Architecture and Basal Resources Interact to Determine Biomass and Stoichiometric Cascades along a Benthic Food Web  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Understanding the effects of predators and resources on primary producers has been a major focus of interest in ecology. Within this context, the trophic cascade concept especially concerning the pelagic zone of lakes has been the focus of the majority of these studies. However, littoral food webs could be especially interesting because base trophic levels may be strongly regulated by consumers and prone to be light limited. In this study, the availability of nutrients and light and the prese...

Guariento, Rafael D.; Carneiro, Luciana S.; Caliman, Adriano; Leal, Joa?o J. F.; Bozelli, Reinaldo L.; Esteves, Francisco A.

2011-01-01

236

A FPGA embedded web server for remote monitoring and control of smart sensors networks.  

Science.gov (United States)

This article describes the implementation of a web server using an embedded Altera NIOS II IP core, a general purpose and configurable RISC processor which is embedded in a Cyclone FPGA. The processor uses the ?CLinux operating system to support a Boa web server of dynamic pages using Common Gateway Interface (CGI). The FPGA is configured to act like the master node of a network, and also to control and monitor a network of smart sensors or instruments. In order to develop a totally functional system, the FPGA also includes an implementation of the time-triggered protocol (TTP/A). Thus, the implemented master node has two interfaces, the webserver that acts as an Internet interface and the other to control the network. This protocol is widely used to connecting smart sensors and actuators and microsystems in embedded real-time systems in different application domains, e.g., industrial, automotive, domotic, etc., although this protocol can be easily replaced by any other because of the inherent characteristics of the FPGA-based technology. PMID:24379047

Magdaleno, Eduardo; Rodríguez, Manuel; Pérez, Fernando; Hernández, David; García, Enrique

2013-01-01

237

A FPGA Embedded Web Server for Remote Monitoring and Control of Smart Sensors Networks  

Directory of Open Access Journals (Sweden)

Full Text Available This article describes the implementation of a web server using an embedded Altera NIOS II IP core, a general purpose and configurable RISC processor which is embedded in a Cyclone FPGA. The processor uses the ?CLinux operating system to support a Boa web server of dynamic pages using Common Gateway Interface (CGI. The FPGA is configured to act like the master node of a network, and also to control and monitor a network of smart sensors or instruments. In order to develop a totally functional system, the FPGA also includes an implementation of the time-triggered protocol (TTP/A. Thus, the implemented master node has two interfaces, the webserver that acts as an Internet interface and the other to control the network. This protocol is widely used to connecting smart sensors and actuators and microsystems in embedded real-time systems in different application domains, e.g., industrial, automotive, domotic, etc., although this protocol can be easily replaced by any other because of the inherent characteristics of the FPGA-based technology.

Eduardo Magdaleno

2013-12-01

238

Bi-Fi: an embedded sensor/system architecture for REMOTE biological monitoring.  

Science.gov (United States)

Wireless-enabled processor modules intended for communicating low-frequency phenomena (i.e., temperature, humidity, and ambient light) have been enabled to acquire and transmit multiple biological signals in real time, which has been achieved by using computationally efficient data acquisition, filtering, and compression algorithms, and interfacing the modules with biological interface hardware. The sensor modules can acquire and transmit raw biological signals at a rate of 32 kb/s, which is near the hardware limit of the modules. Furthermore, onboard signal processing enables one channel, sampled at a rate of 4000 samples/s at 12-bit resolution, to be compressed via adaptive differential-pulse-code modulation (ADPCM) and transmitted in real time. In addition, the sensors can be configured to filter and transmit individual time-referenced "spike" waveforms, or to transmit the spike height and width for alleviating network traffic and increasing battery life. The system is capable of acquiring eight channels of analog signals as well as data via an asynchronous serial connection. A back-end server archives the biological data received via networked gateway sensors, and hosts them to a client application that enables users to browse recorded data. The system also acquires, filters, and transmits oxygen saturation and pulse rate via a commercial-off-the-shelf interface board. The system architecture can be configured for performing real-time nonobtrusive biological monitoring of humans or rodents. This paper demonstrates that low-power, computational, and bandwidth-constrained wireless-enabled platforms can indeed be leveraged for wireless biosignal monitoring. PMID:18046936

Farshchi, Shahin; Pesterev, Aleksey; Nuyujukian, Paul H; Mody, Istvan; Judy, Jack W

2007-11-01

239

A Survey of System Architecture Requirements for Health Care-Based Wireless Sensor Networks  

Directory of Open Access Journals (Sweden)

Full Text Available Wireless Sensor Networks (WSNs have emerged as a viable technology for a vast number of applications, including health care applications. To best support these health care applications, WSN technology can be adopted for the design of practical Health Care WSNs (HCWSNs that support the key system architecture requirements of reliable communication, node mobility support, multicast technology, energy efficiency, and the timely delivery of data. Work in the literature mostly focuses on the physical design of the HCWSNs (e.g., wearable sensors, in vivo embedded sensors, et cetera. However, work towards enhancing the communication layers (i.e., routing, medium access control, et cetera to improve HCWSN performance is largely lacking. In this paper, the information gleaned from an extensive literature survey is shared in an effort to fortify the knowledge base for the communication aspect of HCWSNs. We highlight the major currently existing prototype HCWSNs and also provide the details of their routing protocol characteristics. We also explore the current state of the art in medium access control (MAC protocols for WSNs, for the purpose of seeking an energy efficient solution that is robust to mobility and delivers data in a timely fashion. Furthermore, we review a number of reliable transport layer protocols, including a network coding based protocol from the literature, that are potentially suitable for delivering end-to-end reliability of data transmitted in HCWSNs. We identify the advantages and disadvantages of the reviewed MAC, routing, and transport layer protocols as they pertain to the design and implementation of a HCWSN. The findings from this literature survey will serve as a useful foundation for designing a reliable HCWSN and also contribute to the development and evaluation of protocols for improving the performance of future HCWSNs. Open issues that required further investigations are highlighted.

Abraham O. Fapojuwo

2011-05-01

240

Inversion of Web Service Invocation using Publish/Subscribe Push-Based Architecture  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Among enterprise application integration solutions, Web services technologies are promising technologies to achieve the interoperability in heterogeneous environments. However, traditional Web service invocation may lead to unnecessary network traffic, long response time, and bottleneck problems at service providers. While a publish/subscribe model provides an advantage of prompt notification which can eliminate unnecessary network traffic, its achievement in interoperability is limited. By i...

Thanisa Numnonda; Rattakorn Poonsuph

2012-01-01

 
 
 
 
241

A Collaborative Web-Based Architecture For Sharing ToxCast Data  

Science.gov (United States)

Collaborative Drug Discovery (CDD) has created a scalable platform that combines traditional drug discovery informatics with Web2.0 features. Traditional drug discovery capabilities include substructure, similarity searching and export to excel or sdf formats. Web2.0 features inc...

242

An Object-Oriented Architecture for a Web-Based CAI System.  

Science.gov (United States)

This paper describes the design and implementation of an object-oriented World Wide Web-based CAI (Computer-Assisted Instruction) system. The goal of the design is to provide a flexible CAI/ITS (Intelligent Tutoring System) framework with full extendibility and reusability, as well as to exploit Web-based software technologies such as JAVA, ASP (a…

Nakabayashi, Kiyoshi; Hoshide, Takahide; Seshimo, Hitoshi; Fukuhara, Yoshimi

243

QuakeSim: a Web Service Environment for Productive Investigations with Earth Surface Sensor Data  

Science.gov (United States)

The QuakeSim science gateway environment includes a visually rich portal interface, web service access to data and data processing operations, and the QuakeTables ontology-based database of fault models and sensor data. The integrated tools and services are designed to assist investigators by covering the entire earthquake cycle of strain accumulation and release. The Web interface now includes Drupal-based access to diverse and changing content, with new ability to access data and data processing directly from the public page, as well as the traditional project management areas that require password access. The system is designed to make initial browsing of fault models and deformation data particularly engaging for new users. Popular data and data processing include GPS time series with data mining techniques to find anomalies in time and space, experimental forecasting methods based on catalogue seismicity, faulted deformation models (both half-space and finite element), and model-based inversion of sensor data. The fault models include the CGS and UCERF 2.0 faults of California and are easily augmented with self-consistent fault models from other regions. The QuakeTables deformation data include the comprehensive set of UAVSAR interferograms as well as a growing collection of satellite InSAR data.. Fault interaction simulations are also being incorporated in the web environment based on Virtual California. A sample usage scenario is presented which follows an investigation of UAVSAR data from viewing as an overlay in Google Maps, to selection of an area of interest via a polygon tool, to fast extraction of the relevant correlation and phase information from large data files, to a model inversion of fault slip followed by calculation and display of a synthetic model interferogram.

Parker, J. W.; Donnellan, A.; Granat, R. A.; Lyzenga, G. A.; Glasscoe, M. T.; McLeod, D.; Al-Ghanmi, R.; Pierce, M.; Fox, G.; Grant Ludwig, L.; Rundle, J. B.

2011-12-01

244

A Pattern for Web-based WSN Monitoring (Invited Paper  

Directory of Open Access Journals (Sweden)

Full Text Available This paper describes a pattern for the architecture of web-based wireless sensor network monitoring. Sensor nodes are used to measure characteristics of the physical environment and sensed data is stored on the Internet using web-based technologies. Users can access data remotely as long as they have Internet connectivity. Many wireless sensor network applications developed today use smartphones as a gateway between the sensor network or the user, and the Internet. This allows the sensor network and/or the users to be mobile. Implementation of a web-based wireless sensor network architecture, that uses smartphones, provides a scalable solution with applicability in many areas such as healthcare, environmental monitoring, border security, structural health monitoring, and many more.

Fulvio Frati

2011-08-01

245

Implementation and Performance of a GPS/INS Tightly Coupled Assisted PLL Architecture Using MEMS Inertial Sensors  

Directory of Open Access Journals (Sweden)

Full Text Available The use of global navigation satellite system receivers for navigation still presents many challenges in urban canyon and indoor environments, where satellite availability is typically reduced and received signals are attenuated. To improve the navigation performance in such environments, several enhancement methods can be implemented. For instance, external aid provided through coupling with other sensors has proven to contribute substantially to enhancing navigation performance and robustness. Within this context, coupling a very simple GPS receiver with an Inertial Navigation System (INS based on low-cost micro-electro-mechanical systems (MEMS inertial sensors is considered in this paper. In particular, we propose a GPS/INS Tightly Coupled Assisted PLL (TCAPLL architecture, and present most of the associated challenges that need to be addressed when dealing with very-low-performance MEMS inertial sensors. In addition, we propose a data monitoring system in charge of checking the quality of the measurement flow in the architecture. The implementation of the TCAPLL is discussed in detail, and its performance under different scenarios is assessed. Finally, the architecture is evaluated through a test campaign using a vehicle that is driven in urban environments, with the purpose of highlighting the pros and cons of combining MEMS inertial sensors with GPS over GPS alone.

Youssef Tawk

2014-02-01

246

Implementation and performance of a GPS/INS tightly coupled assisted PLL architecture using MEMS inertial sensors.  

Science.gov (United States)

The use of global navigation satellite system receivers for navigation still presents many challenges in urban canyon and indoor environments, where satellite availability is typically reduced and received signals are attenuated. To improve the navigation performance in such environments, several enhancement methods can be implemented. For instance, external aid provided through coupling with other sensors has proven to contribute substantially to enhancing navigation performance and robustness. Within this context, coupling a very simple GPS receiver with an Inertial Navigation System (INS) based on low-cost micro-electro-mechanical systems (MEMS) inertial sensors is considered in this paper. In particular, we propose a GPS/INS Tightly Coupled Assisted PLL (TCAPLL) architecture, and present most of the associated challenges that need to be addressed when dealing with very-low-performance MEMS inertial sensors. In addition, we propose a data monitoring system in charge of checking the quality of the measurement flow in the architecture. The implementation of the TCAPLL is discussed in detail, and its performance under different scenarios is assessed. Finally, the architecture is evaluated through a test campaign using a vehicle that is driven in urban environments, with the purpose of highlighting the pros and cons of combining MEMS inertial sensors with GPS over GPS alone. PMID:24569773

Tawk, Youssef; Tomé, Phillip; Botteron, Cyril; Stebler, Yannick; Farine, Pierre-André

2014-01-01

247

Migrating EO/IR sensors to cloud-based infrastructure as service architectures  

Science.gov (United States)

The Night Vision Image Generator (NVIG), a product of US Army RDECOM CERDEC NVESD, is a visualization tool used widely throughout Army simulation environments to provide fully attributed synthesized, full motion video using physics-based sensor and environmental effects. The NVIG relies heavily on contemporary hardware-based acceleration and GPU processing techniques, which push the envelope of both enterprise and commodity-level hypervisor support for providing virtual machines with direct access to hardware resources. The NVIG has successfully been integrated into fully virtual environments where system architectures leverage cloudbased technologies to various extents in order to streamline infrastructure and service management. This paper details the challenges presented to engineers seeking to migrate GPU-bound processes, such as the NVIG, to virtual machines and, ultimately, Cloud-Based IAS architectures. In addition, it presents the path that led to success for the NVIG. A brief overview of Cloud-Based infrastructure management tool sets is provided, and several virtual desktop solutions are outlined. A discrimination is made between general purpose virtual desktop technologies compared to technologies that expose GPU-specific capabilities, including direct rendering and hard ware-based video encoding. Candidate hypervisor/virtual machine configurations that nominally satisfy the virtualized hardware-level GPU requirements of the NVIG are presented , and each is subsequently reviewed in light of its implications on higher-level Cloud management techniques. Implementation details are included from the hardware level, through the operating system, to the 3D graphics APls required by the NVIG and similar GPU-bound tools.

Berglie, Stephen T.; Webster, Steven; May, Christopher M.

2014-06-01

248

Key design elements of a data utility for national biosurveillance: event-driven architecture, caching, and Web service model.  

Science.gov (United States)

The National Retail Data Monitor (NRDM) has monitored over-the-counter (OTC) medication sales in the United States since December 2002. The NRDM collects data from over 18,600 retail stores and processes over 0.6 million sales records per day. This paper describes key architectural features that we have found necessary for a data utility component in a national biosurveillance system. These elements include event-driven architecture to provide analyses of data in near real time, multiple levels of caching to improve query response time, high availability through the use of clustered servers, scalable data storage through the use of storage area networks and a web-service function for interoperation with affiliated systems. The methods and architectural principles are relevant to the design of any production data utility for public health surveillance-systems that collect data from multiple sources in near real time for use by analytic programs and user interfaces that have substantial requirements for time-series data aggregated in multiple dimensions. PMID:16779138

Tsui, Fu-Chiang; Espino, Jeremy U; Weng, Yan; Choudary, Arvinder; Su, Hoah-Der; Wagner, Michael M

2005-01-01

249

A novel 3D architecture for high-dynamic range image sensor and on-chip data compression  

Science.gov (United States)

High Dynamic Range (HDR) Image sensors aim at having a dynamic over 120dB. Compared to classical architectures this is obtained at the cost of a higher transistor count, thus lower fill factor. Three Dimensional integrated circuits (3DIC) somehow change the constraints, photodiodes and electronics can be stacked on different layers, giving more processing powers without compromising the fill factor. In this paper, we propose an original architecture for a high dynamic 3D image sensor with data reduction obtained by local compression. HDR acquisition is based on a floating point coding shared by a group of pixel (macro-pixel), thus giving also a first level of compression. A second level of compression is performed by using a Discrete Cosine Transform (DCT). With this new concept a good image quality (PSNR of about 40 dB) and a high dynamic range (120 dB) are obtained within a pixel area of 5?m×5?m.

Guezzi-Messaoud, F.; Dupret, A.; Peizerat, A.; Blanchard, Y.

2011-03-01

250

Life Under Your Feet: An End-to-End Soil Ecology Sensor Network, Database, Web Server, and Analysis Service  

CERN Document Server

Wireless sensor networks can revolutionize soil ecology by providing measurements at temporal and spatial granularities previously impossible. This paper presents a soil monitoring system we developed and deployed at an urban forest in Baltimore as a first step towards realizing this vision. Motes in this network measure and save soil moisture and temperature in situ every minute. Raw measurements are periodically retrieved by a sensor gateway and stored in a central database where calibrated versions are derived and stored. The measurement database is published through Web Services interfaces. In addition, analysis tools let scientists analyze current and historical data and help manage the sensor network. The article describes the system design, what we learned from the deployment, and initial results obtained from the sensors. The system measures soil factors with unprecedented temporal precision. However, the deployment required device-level programming, sensor calibration across space and time, and cross...

Szlavecz, K; Ozer, S; Musaloiu-E, R; Cogan, J; Small, S; Burns, R; Gray, J; Szalay, A S; Szlavecz, Katalin; Terzis, Andreas; Ozer, Stuart; Musaloiu-E, Razvan; Cogan, Joshua; Small, Sam; Burns, Randal; Gray, Jim; Szalay, Alex

2007-01-01

251

RoCoMAR: Robots’ Controllable Mobility Aided Routing and Relay Architecture for Mobile Sensor Networks  

Directory of Open Access Journals (Sweden)

Full Text Available In a practical deployment, mobile sensor network (MSN suffers from a low performance due to high node mobility, time-varying wireless channel properties, and obstacles between communicating nodes. In order to tackle the problem of low network performance and provide a desired end-to-end data transfer quality, in this paper we propose a novel ad hoc routing and relaying architecture, namely RoCoMAR (Robots’ Controllable Mobility Aided Routing that uses robotic nodes’ controllable mobility. RoCoMAR repeatedly performs link reinforcement process with the objective of maximizing the network throughput, in which the link with the lowest quality on the path is identified and replaced with high quality links by placing a robotic node as a relay at an optimal position. The robotic node resigns as a relay if the objective is achieved or no more gain can be obtained with a new relay. Once placed as a relay, the robotic node performs adaptive link maintenance by adjusting its position according to the movements of regular nodes. The simulation results show that RoCoMAR outperforms existing ad hoc routing protocols for MSN in terms of network throughput and end-to-end delay.

Seokhoon Yoon

2013-07-01

252

Lightweight Filter Architecture for Energy Efficient Mobile Vehicle Localization Based on a Distributed Acoustic Sensor Network  

Directory of Open Access Journals (Sweden)

Full Text Available The generic properties of an acoustic signal provide numerous benefits for localization by applying energy-based methods over a deployed wireless sensor network (WSN. However, the signal generated by a stationary target utilizes a significant amount of bandwidth and power in the system without providing further position information. For vehicle localization, this paper proposes a novel proximity velocity vector estimator (PVVE node architecture in order to capture the energy from a moving vehicle and reject the signal from motionless automobiles around the WSN node. A cascade structure between analog envelope detector and digital exponential smoothing filter presents the velocity vector-sensitive output with low analog circuit and digital computation complexity. The optimal parameters in the exponential smoothing filter are obtained by analytical and mathematical methods for maximum variation over the vehicle speed. For stationary targets, the derived simulation based on the acoustic field parameters demonstrates that the system significantly reduces the communication requirements with low complexity and can be expected to extend the operation time considerably.

Keonwook Kim

2013-08-01

253

RoCoMAR: robots' controllable mobility aided routing and relay architecture for mobile sensor networks.  

Science.gov (United States)

In a practical deployment, mobile sensor network (MSN) suffers from a low performance due to high node mobility, time-varying wireless channel properties, and obstacles between communicating nodes. In order to tackle the problem of low network performance and provide a desired end-to-end data transfer quality, in this paper we propose a novel ad hoc routing and relaying architecture, namely RoCoMAR (Robots' Controllable Mobility Aided Routing) that uses robotic nodes' controllable mobility. RoCoMAR repeatedly performs link reinforcement process with the objective of maximizing the network throughput, in which the link with the lowest quality on the path is identified and replaced with high quality links by placing a robotic node as a relay at an optimal position. The robotic node resigns as a relay if the objective is achieved or no more gain can be obtained with a new relay. Once placed as a relay, the robotic node performs adaptive link maintenance by adjusting its position according to the movements of regular nodes. The simulation results show that RoCoMAR outperforms existing ad hoc routing protocols for MSN in terms of network throughput and end-to-end delay. PMID:23881134

Le, Duc Van; Oh, Hoon; Yoon, Seokhoon

2013-01-01

254

The implementation of common object request broker architecture (CORBA) for controlling robot arm via web  

International Nuclear Information System (INIS)

This paper presents the employment of the Common Object Request Broker Architecture (CORBA) technology in the implementation of our distributed Arm Robot Controller (ARC). CORBA is an industrial standard architecture based on distributed abstract object model, which is developed by Object Management Group (OMG). The architecture consists of five components i.e. Object Request Broker (ORB), Interface Definition Language (IDL), Dynamic Invocation Interface (DII), Interface Repositories (IR) and Object adapter (OA). CORBA objects are different from typical programming objects in three ways i.e. they can be executed on any platform, located anywhere on the network and written in any language that supports IDL mapping. In the implementation of the system, 5 degree of freedom (DOF) arm robot RCS 6.0 and Java as a programming mapping to the CORBA IDL. By implementing this architecture, the objects in the server machine can be distributed over the network in order to run the controller. the ultimate goal for our ARC system is to demonstrate concurrent execution of multiple arm robots through multiple instantiations of distributed object components. (Author)

255

The ecological model web concept: A consultative infrastructure for researchers and decision makers using a Service Oriented Architecture  

Science.gov (United States)

Rapid climate and socioeconomic changes may be outrunning society's ability to understand, predict, and respond to change effectively. Decision makers such as natural resource managers want better information about what these changes will be and how the resources they are managing will be affected. Researchers want better understanding of the components and processes of ecological systems, how they interact, and how they respond to change. Nearly all these activities require computer models to make ecological forecasts that can address "what if" questions. However, despite many excellent models in ecology and related disciplines, there is no coordinated model system—that is, a model infrastructure--that researchers or decision makers can consult to gain insight on important ecological questions or help them make decisions. While this is partly due to the complexity of the science, to lack of critical observations, and other issues, limited access to and sharing of models and model outputs is a factor as well. An infrastructure that increased access to and sharing of models and model outputs would benefit researchers, decision makers of all kinds, and modelers. One path to such a "consultative infrastructure" for ecological forecasting is called the Model Web, a concept for an open-ended system of interoperable computer models and databases communicating using a Service Oriented Architectures (SOA). Initially, it could consist of a core of several models, perhaps made interoperable retroactively, and then it could grow gradually as new models or databases were added. Because some models provide basic information of use to many other models, such as simple physical parameters, these "keystone" models are of particular importance in a model web. In the long run, a model web would not be rigidly planned and built--instead, like the World Wide Web, it would grow largely organically, with limited central control, within a framework of broad goals and data exchange standards. These standards would emerge naturally from the modeling communities they serve, as they must accommodate many disciplines with different needs and histories. Building a model web is likely a gradual process, both because adapting existing models requires significant effort, and because many of the barriers to model interoperability and greater model access can only be lowered gradually. While most technical barriers have solutions in varying stages of maturity, there are also social and institutional barriers that are quite slow to change. Ultimately, the value of a model web lies in the increase in access to and sharing of both models and model outputs. By lowering access barriers to models and their outputs there is less reinvention, more efficient use of resources, greater interaction among researchers and across disciplines, as well as other benefits. The growth of such a system of models fits well with the concept and architecture of the Global Earth Observing System of Systems (GEOSS) as well as the Semantic Web. And, while framed here in the context of ecological forecasting, the same concept can be applied to any discipline utilizing models.

Geller, Gary

2010-05-01

256

Adaptation of Web Services to the Context Based on Workflow: Approach for Self-Adaptation of Service-Oriented Architectures to the Context  

Directory of Open Access Journals (Sweden)

Full Text Available The emergence of Web services in the information space, as well as the advanced technology of SOA, givetremendous opportunities for users in an ambient space or distant, empowerment and organizations invarious fields application, such as geolocation, E-learning, healthcare, digital government, etc.. In fact,Web services are a solution for the integration of distributed information systems, autonomous,heterogeneous and self-adaptable to the context. However, as Web services can evolve in a dynamicenvironment in a well-defined context and according to events automatically, such as time, temperature,location, authentication, etc.. We are interested in improving their SOA to empower the Web services to beself adaptive contexts. In this paper, we propose a new trend of self adaptability of Web services context.Then applying these requirements in the architecture of the platform of adaptability to context “WComp”,by integrating the workflow. Our work is illustrated by a case study of authentication.

Faical Felhi

2012-11-01

257

SAMuS: service-oriented architecture for multisensor surveillance in smart homes.  

Science.gov (United States)

The design of a service-oriented architecture for multisensor surveillance in smart homes is presented as an integrated solution enabling automatic deployment, dynamic selection, and composition of sensors. Sensors are implemented as Web-connected devices, with a uniform Web API. RESTdesc is used to describe the sensors and a novel solution is presented to automatically compose Web APIs that can be applied with existing Semantic Web reasoners. We evaluated the solution by building a smart Kinect sensor that is able to dynamically switch between IR and RGB and optimizing person detection by incorporating feedback from pressure sensors, as such demonstrating the collaboration among sensors to enhance detection of complex events. The performance results show that the platform scales for many Web APIs as composition time remains limited to a few hundred milliseconds in almost all cases. PMID:24778579

Van Hoecke, Sofie; Verborgh, Ruben; Van Deursen, Davy; Van de Walle, Rik

2014-01-01

258

Lithosphere-to-Ionosphere Plug-and-Play Architecture (LION-PNP): Sensor Networking Made Cheap and Easy  

Science.gov (United States)

The lack of rapidly reconfigurable and easily deployable instrumentation packages often results in information loss during unannounced or time-critical geophysical events such as spaceweather flare-ups, earthquakes, volcanic eruptions, and tsunamis. While increasingly powerful and sensitive sensor technologies have been created in the last years to study our planet, robust, yet simple and cost-effective, mechanical, electrical, and data interfaces between these devices and the user (scientist) have yet to be developed. To address this problem, we present the LIthosphere-to-IOnosphere Plug-aNd-Play architecture (LION-PNP), a complete, low cost integration protocol for space, atmospheric, and terrestrial sensor networks. Similar to the USB plug-and-play protocols created for personal computers, LION-PNP offers geophysicists and space scientists the ability to assemble and operate complex sensor packages by simply 'plugging' devices (magnetometers, seismometers, GPS, spectrometers, etc) into a centralized Command and Data Handling unit (CDH). LION-PNP accomplishes this by inserting a Generic Sensor Interpreter (GSI) between the back-end of a device and the CDH. The GSI allows the CDH to automatically configure a sensor without requiring the user to manually install drivers. Furthermore, LION-PNP supports a number wireless networking protocols, allowing arrays of sensor nodes to be deployed rapidly over an area of interest. Finally, LION is compatible with the Android operating system, allowing the user to rapidly visualize, store and distribute data. In the following work, we report on the development of LION-PNP. To validate our hardware and software interfaces, we flew a small 4-point LION network on a multiple high altitude balloon launch. For this campaign, each node carried an array of sensors, including a magnetometer, temperature and pressure sensors, as well as GPS. The LION plug-and-play system allowed us to compose the network minutes before launch. Once in flight, the network and data management were handled by a Nexus 7 tablet.

Darling, N.; Mendez, J. S.; Manes, C.

2013-12-01

259

Adaptive Sky: Observing Clouds Using Multi-Instrument, Multi-Platform Sensor Webs  

Science.gov (United States)

At present there exists a large suite of spaceborne and in-situ assets operated by NASA, NOAA, and other organizations, that provide independent sensing of the Earth's atmosphere, oceans, and land surfaces. As the number of these assets grows, there is an increasing need for methods that combine these observations to provide a more complete and coherent picture of important geophysical processes. As part of a project supported through NASA's Earth Science Technology Office (ESTO), we have developed techniques that address this challenge by dynamically combining information from multiple sensors on different platforms to form sensor webs, which can respond quickly to short-lived events and provide rich, multi-modal observations of objects, such as clouds, that are evolving in both space and time. Techniques were adapted from the fields of computational data mining, computer vision, and machine learning that allow correspondence to be automatically established among various sets of observations. Two science scenarios were chosen to steer the development of the project: (1) matchups between the morning and afternoon constellations of the NASA Earth Observing System (EOS) satellites, including the MODIS, MISR, AIRS, CloudSat, and CALIPSO instruments, and (2) correspondences between satellite and ground-based cloud images. The EOS matchup scenario provided improved satellite-derived information about cloud formation and development, along with important algorithm intercomparison information. The second scenario yielded new perspectives related to the three-dimensional structure and development of clouds. This work was performed at the Jet Propulsion Laboratory, California Institute of Technology under contract with the National Aeronautics and Space Administration.

Garay, M. J.; Burl, M. C.; Wang, Y.; Ng, J.

2007-12-01

260

Observing Iceland's Eyjafjallajökull 2010 eruptions with the autonomous NASA Volcano Sensor Web  

Science.gov (United States)

24 March and 5 June 2010, the Hyperion hyperspectral imager and Advanced Land Imager (ALI) on NASA's Earth Observing 1 (EO-1) spacecraft obtained an unprecedented sequence of 50 observation pairs of the eruptions at Fimmvörðuháls and Eyjafjallajökull, Iceland. This high acquisition rate was possible only through the use of data flow streamlined by using the autonomously operating NASA Volcano Sensor Web (VSW). The VSW incorporates notifications of volcanic activity from multiple sources to retask EO-1 and process Hyperion data to extract eruption parameters from high spatial and spectral resolution visible and short-wavelength infrared data. Physical changes in eruption style and magnitude were charted as the eruptions ran their course. Rapid data downlink and automatic data-processing algorithms generated a variety of products which are compared with estimates from ground-based observations and post-eruption in situ measurements. Estimates of effusion rate from heat loss measurements underestimate actual effusion rate (while still following broad eruption rate trends) but are closer to in situ estimates for effusive eruptions (Fimmvörðuháls) than explosive, ash-rich eruptions (Eyjafjallajökull). During the later stages of the 2010 eruption, VSW-generated products were rapidly delivered to end-users in Iceland to aid in the assessment of risk and hazard. The success of the VSW led to Icelandic Meteorological Office (IMO) in situ sensors being incorporated into the VSW, and in May 2011 an IMO seismic alert autonomously triggered EO-1 observations of a new eruption at Grímsvötn volcano. Finally, the VSW demonstrates an autonomy-driven, multi-asset, spacecraft retasking and data processing system that maximizes science return, a desirable capability for future NASA missions.

Davies, Ashley Gerard; Chien, Steve; Doubleday, Joshua; Tran, Daniel; Thordarson, Thorvaldur; Gudmundsson, Magnús T.; HöSkuldsson, ÁRmann; Jakobsdóttir, Steinunn S.; Wright, Robert; Mandl, Daniel

2013-05-01

 
 
 
 
261

Dolphin-FEW: an architecture for compilers development, monitoring and use on the web  

Digital Repository Infrastructure Vision for European Research (DRIVER)

DOLPHIN is a framework developed to help the construction of high performance, multi-language and retargetable compilers. It is constituted by a set of components, used to build and test new compilers or compiler routines; and by a set of tools, used to access, manage and develop the components. To improve and enlarge the functionalities of the DOLPHIN, several small projects were implemented around the framework, one of them is the DOLPHIN – Front-End for the Web, whose the goal is to buil...

Matos, Paulo; Henriques, Pedro

2003-01-01

262

Server Technology – Web Based Service Oriented Architecture for Mobile Augmented Reality System  

Directory of Open Access Journals (Sweden)

Full Text Available Server Technology stands for lots of technology in mind like Microsoft, Sun Java, IBM, Open Source and many more. In mobile augmentation, server plays very important role to augment the data. Responsibility of the server is to collect the data , mixed virtual data with real data and these data sent back to client on Remote device at Remote place In this paper we briefly discuss about the server technology for web based Service oriented, also the processing software required for augmentation, it’s software technology, how they accept input from various types of devices and generated output data of various types like audio, video, 3-D graphics.

Jatin Dilipkumar Shah

2012-11-01

263

MVC Architecture Driven Design and Agile Implementation of a Web-Based Software System  

Directory of Open Access Journals (Sweden)

Full Text Available This paper reports design and implementation of a web based software system for storing and managinginformation related to time management and productivity of employees working on a project.The systemhas been designed and implemented with best principles from model viewcontrollerand agile development.Such system has practical use for any organization in terms of ease of use, efficiency, and cost savings. Themanuscript describes design of the system as well as its database and user interface. Detailed snapshots ofthe working system are provided too

Sandhya Prakash

2013-11-01

264

Security Architecture Framework and Secure Routing Protocols in Wireless Sensor Networks - Survey  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Wireless sensor networks emerging has increased now a days , therefore the need foreffective security mechanisms is essential. Because sensor networks may interact with sensitive data andoperate in hostile unattended environments, it is imperative that these security concerns be addressedfrom the beginning of the system design. we survey the major topics in wireless sensor network securityarchitecture framework includes the requirements in the sensor security, classify many of the currentatta...

Md Abdul Azeem; Khaleel-ur-Rahman khan; Pramod, A. V.

2011-01-01

265

Web 2.0 systems supporting childhood chronic disease management: A pattern language representation of a general architecture  

Science.gov (United States)

Background Chronic disease management is a global health concern. By the time they reach adolescence, 10–15% of all children live with a chronic disease. The role of educational interventions in facilitating adaptation to chronic disease is receiving growing recognition, and current care policies advocate greater involvement of patients in self-care. Web 2.0 is an umbrella term for new collaborative Internet services characterized by user participation in developing and managing content. Key elements include Really Simple Syndication (RSS) to rapidly disseminate awareness of new information; weblogs (blogs) to describe new trends, wikis to share knowledge, and podcasts to make information available on personal media players. This study addresses the potential to develop Web 2.0 services for young persons with a chronic disease. It is acknowledged that the management of childhood chronic disease is based on interplay between initiatives and resources on the part of patients, relatives, and health care professionals, and where the balance shifts over time to the patients and their families. Methods Participatory action research was used to stepwise define a design specification in the form of a pattern language. Support for children diagnosed with diabetes Type 1 was used as the example area. Each individual design pattern was determined graphically using card sorting methods, and textually in the form Title, Context, Problem, Solution, Examples and References. Application references were included at the lowest level in the graphical overview in the pattern language but not specified in detail in the textual descriptions. Results The design patterns are divided into functional and non-functional design elements, and formulated at the levels of organizational, system, and application design. The design elements specify access to materials for development of the competences needed for chronic disease management in specific community settings, endorsement of self-learning through online peer-to-peer communication, and systematic accreditation and evaluation of materials and processes. Conclusion The use of design patterns allows representing the core design elements of a Web 2.0 system upon which an 'ecological' development of content respecting these constraints can be built. Future research should include evaluations of Web 2.0 systems implemented according to the architecture in practice settings. PMID:19040738

Timpka, Toomas; Eriksson, Henrik; Ludvigsson, Johnny; Ekberg, Joakim; Nordfeldt, Sam; Hanberger, Lena

2008-01-01

266

Optoelectronic Devices, Sensors, Communication and Multimedia, Photonics Applications and Web Engineering, Wilga, May 2012  

Science.gov (United States)

This paper is the fourth part (out of five) of the research survey of WILGA Symposium work, May 2012 Edition, concerned with Optoelectronic Devices, Sensors, Communication and Multimedia (Video and Audio) technologies. It presents a digest of chosen technical work results shown by young researchers from different technical universities from this country during the Jubilee XXXth SPIE-IEEE Wilga 2012, May Edition, symposium on Photonics and Web Engineering. Topical tracks of the symposium embraced, among others, nanomaterials and nanotechnologies for photonics, sensory and nonlinear optical fibers, object oriented design of hardware, photonic metrology, optoelectronics and photonics applications, photonics-electronics co-design, optoelectronic and electronic systems for astronomy and high energy physics experiments, JET tokamak and pi-of-the sky experiments development. The symposium is an annual summary in the development of numerable Ph.D. theses carried out in this country in the area of advanced electronic and photonic systems. It is also a great occasion for SPIE, IEEE, OSA and PSP students to meet together in a large group spanning the whole country with guests from this part of Europe. A digest of Wilga references is presented [1-270].

Romaniuk, Ryszard S.

2012-05-01

267

Making secure Semantic Web  

Digital Repository Infrastructure Vision for European Research (DRIVER)

this paper first describes ways of semantic web security implementation through layers. These layers are presented as a backbone for semantic web architecture and are represented in XML security, RDF security and in an idea of semantic web security standardization.

Adis Medi?; Adis Golubovi?

2010-01-01

268

Web Page Recommendation Using Web Mining  

Directory of Open Access Journals (Sweden)

Full Text Available On World Wide Web various kind of content are generated in huge amount, so to give relevant result to user web recommendation become important part of web application. On web different kind of web recommendation are made available to user every day that includes Image, Video, Audio, query suggestion and web page. In this paper we are aiming at providing framework for web page recommendation. 1 First we describe the basics of web mining, types of web mining. 2 Details of each web mining technique.3We propose the architecture for the personalized web page recommendation.

Modraj Bhavsar

2014-07-01

269

Using elements of game engine architecture to simulate sensor networks for eldercare.  

Science.gov (United States)

When dealing with a real time sensor network, building test data with a known ground truth is a tedious and cumbersome task. In order to quickly build test data for such a network, a simulation solution is a viable option. Simulation environments have a close relationship with computer game environments, and therefore there is much to be learned from game engine design. In this paper, we present our vision for a simulated in-home sensor network and describe ongoing work on using elements of game engines for building the simulator. Validation results are included to show agreement on motion sensor simulation with the physical environment. PMID:19964691

Godsey, Chad; Skubic, Marjorie

2009-01-01

270

A Real Time AI Approach to Discrimination Boost Phase Optical Sensor Systems in SDI Architectures  

Science.gov (United States)

Interest has been rekindled in the potential utility of Ballistic Missile Defence (BMD) systems 1,2 and their ability to enhance the existing NATO strategic defence posture 3,4. Whereas in the past BMD systems have been thought to be vulnerable to relatively simple offence countermeasures, technological developments that have occurred over the past 20 years offer the potential to solve some of the main criticisms that have bedeviled BMD research since its inception in the early 1950s. One of the key areas where dramatic developments have taken place is in the field of electro-optic sensor technologies where developments in device sensitivity and packing density offer new solutions to threat detection, tracking and discrimination that complement data traditionally associated with radar based systems. Analysis has shown 5 that optical sensor systems can make a significant contribution to threat analysis in the boost and mid course phases of flight of ballistic missile systems. In the Boost phase the large amounts of energy contained within the plume of a ballistic missile system provides a signature that must be detected against cloud and earth backgrounds - necessitating viewing from space. The process of detection is complicated by reflected sunlight and other sources of false alarms. The optical sensor systems must therefore be adaptable and capable of reasoning about the location of the signatures, their persistence and temporal variations. Much of this processing is ideally carried out at the sensor system - in order to eliminate false alarms and reduce the communications bandwidths required to transfer the sensor data to centralised early warning and battle management facilities. In the mid course phase optical sensor systems can be used to detect warm objects against the background of deep space. These sensor systems can form tracks on these objects that can be merged into 3D tracks as data from individual sensor systems are combined. As closely spaced objects are resolved by sensor systems feature data can be extracted on individual objects that can be used by the defence system to attempt to discriminate between warheads, decoys and other penetration aids. This paper reviews work that has arisen from joint US SDIO and UK MOD research programmes into the feasibility of Theatre Missile Defence (TMD) systems that would be suitable for deploy ment and operation in a European theatre. The paper focuses on the problems of threat classification and discrimination in TtD systems and highlights the role of optical sensors. The paper discusses the integration of data derived from optical and radar sensors 6 and expands upon work previously reported into the use of an Artificial Intelligence (AI) approach to object classification and discrimination.

Sloggett, David R.

1990-04-01

271

Sensor Search Techniques for Sensing as a Service Architecture for The Internet of Things  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The Internet of Things (IoT) is part of the Internet of the future and will comprise billions of intelligent communicating "things" or Internet Connected Objects (ICO) which will have sensing, actuating, and data processing capabilities. Each ICO will have one or more embedded sensors that will capture potentially enormous amounts of data. The sensors and related data streams can be clustered physically or virtually, which raises the challenge of searching and selecting the ...

Perera, Charith; Zaslavsky, Arkady; Liu, Chi Harold; Compton, Michael; Christen, Peter; Georgakopoulos, Dimitrios

2013-01-01

272

Architecture of poly(o-phenylenediamine)–Ag nanoparticle composites for a hydrogen peroxide sensor  

International Nuclear Information System (INIS)

sub>2 and could be used as a sensor for H2O2 detection. The sensor exhibited fast amperometric response to H2O2 with high selectivity, good reproducibility and stability. The linear range was 6.0 ?M to 67.3 mM with a detection limit of 1.5 ?M. Thus, it is considered to be an ideal candidate for practical application.

273

A Kinematic Approach to Determining the Optimal Actuator Sensor Architecture for Space Robots  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Autonomous space robots will be required for such future missions as the construction of large space structures and repairing disabled satellites. These robots will need to be precisely controlled. However, factors such as manipulator joint/actuator friction and spacecraft attitude control thruster inaccuracies can substantially degrade control system performance. Sensor-based control algorithms can be used to mitigate the effects of actuator error, but sensors can add substantially to a spac...

Boning, Peggy; Dubowsky, Steven

2010-01-01

274

Electrospun Carbon Nanofiber Webs with Controlled Density of States for Sensor Applications  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Electrospun carbon nanofiber (CNF) webs with controlled density of states (DOS) are synthesized through varying the carbonization conditions to manipulate the concentration of nanosized graphite domains. These materials exhibit adjustable electrochemical activity and biosensitivity: both electron transfer kinetics for various redox systems and direct electron transfer efficiencies with enzymes increase with the DOS of the CNF webs.

Mao, Xianwen; Simeon, Fritz; Rutledge, Gregory C.; Hatton, T. Alan

2012-01-01

275

IN-SITU IONIC CHEMICAL ANALYSIS OF FRESH WATER VIA A NOVEL COMBINED MULTI-SENSOR / SIGNAL PROCESSING ARCHITECTURE  

Science.gov (United States)

The capability for comprehensive, real-time, in-situ characterization of the chemical constituents of natural waters is a powerful tool for the advancement of the ecological and geochemical sciences, e.g. by facilitating rapid high-resolution adaptive sampling campaigns and avoiding the potential errors and high costs related to traditional grab sample collection, transportation and analysis. Portable field-ready instrumentation also promotes the goals of large-scale monitoring networks, such as CUASHI and WATERS, without the financial and human resources overhead required for traditional sampling at this scale. Problems of environmental remediation and monitoring of industrial waste waters would additionally benefit from such instrumental capacity. In-situ measurement of all major ions contributing to the charge makeup of natural fresh water is thus pursued via a combined multi-sensor/multivariate signal processing architecture. The instrument is based primarily on commercial electrochemical sensors, e.g. ion selective electrodes (ISEs) and ion selective field-effect transistors (ISFETs), to promote low cost as well as easy maintenance and reproduction,. The system employs a novel architecture of multivariate signal processing to extract accurate information from in-situ data streams via an "unmixing" process that accounts for sensor non-linearities at low concentrations, as well as sensor cross-reactivities. Conductivity, charge neutrality and temperature are applied as additional mathematical constraints on the chemical state of the system. Including such non-ionic information assists in obtaining accurate and useful calibrations even in the non-linear portion of the sensor response curves, and measurements can be made without the traditionally-required standard additions or ionic strength adjustment. Initial work demonstrates the effectiveness of this methodology at predicting inorganic cations (Na+, NH4+, H+, Ca2+, and K+) in a simplified system containing only a single anion (Cl-) in addition to hydroxide, thus allowing charge neutrality to be easily and explicitly invoked. Calibration of every probe relative to each of the five cations present is undertaken, and resulting curves are used to create a representative environmental data set based on USGS data for New England waters. Signal processing methodologies, specifically artificial neural networks (ANNs), are extended to use a feedback architecture based on conductivity measurements and charge neutrality calculations. The algorithms are then tuned to optimize performance of the algorithm at predicting actual concentrations from these simulated signals. Results are compared to use of component probes as stand-alone sensors. Future extension of this instrument for multiple anions (including carbonate and bicarbonate, nitrate, and sulfate) will ultimately provide rapid, accurate field measurements of the entire charge balance of natural waters at high resolution, improving sampling abilities while reducing costs and errors related to transport and analysis of grab samples.

Mueller, A. V.; Hemond, H.

2009-12-01

276

Field-programmable gate array-based hardware architecture for high-speed camera with KAI-0340 CCD image sensor  

Science.gov (United States)

We present a field-programmable gate array (FPGA)-based hardware architecture for high-speed camera which have fast auto-exposure control and colour filter array (CFA) demosaicing. The proposed hardware architecture includes the design of charge coupled devices (CCD) drive circuits, image processing circuits, and power supply circuits. CCD drive circuits transfer the TTL (Transistor-Transistor-Logic) level timing Sequences which is produced by image processing circuits to the timing Sequences under which CCD image sensor can output analog image signals. Image processing circuits convert the analog signals to digital signals which is processing subsequently, and the TTL timing, auto-exposure control, CFA demosaicing, and gamma correction is accomplished in this module. Power supply circuits provide the power for the whole system, which is very important for image quality. Power noises effect image quality directly, and we reduce power noises by hardware way, which is very effective. In this system, the CCD is KAI-0340 which is can output 210 full resolution frame-per-second, and our camera can work outstandingly in this mode. The speed of traditional auto-exposure control algorithms to reach a proper exposure level is so slow that it is necessary to develop a fast auto-exposure control method. We present a new auto-exposure algorithm which is fit high-speed camera. Color demosaicing is critical for digital cameras, because it converts a Bayer sensor mosaic output to a full color image, which determines the output image quality of the camera. Complexity algorithm can acquire high quality but cannot implement in hardware. An low-complexity demosaicing method is presented which can implement in hardware and satisfy the demand of quality. The experiment results are given in this paper in last.

Wang, Hao; Yan, Su; Zhou, Zuofeng; Cao, Jianzhong; Yan, Aqi; Tang, Linao; Lei, Yangjie

2013-08-01

277

Designing an architectural style for dynamic medical Cross-Organizational Workflow management system: an approach based on agents and web services.  

Science.gov (United States)

This paper shows how the combined use of agent and web services technologies can help to design an architectural style for dynamic medical Cross-Organizational Workflow (COW) management system. Medical COW aims at supporting the collaboration between several autonomous and possibly heterogeneous medical processes, distributed over different organizations (Hospitals, Clinic or laboratories). Dynamic medical COW refers to occasional cooperation between these health organizations, free of structural constraints, where the medical partners involved and their number are not pre-defined. More precisely, this paper proposes a new architecture style based on agents and web services technologies to deal with two key coordination issues of dynamic COW: medical partners finding and negotiation between them. It also proposes how the proposed architecture for dynamic medical COW management system can connect to a multi-agent system coupling the Clinical Decision Support System (CDSS) with Computerized Prescriber Order Entry (CPOE). The idea is to assist the health professionals such as doctors, nurses and pharmacists with decision making tasks, as determining diagnosis or patient data analysis without stopping their clinical processes in order to act in a coherent way and to give care to the patient. PMID:24682670

Bouzguenda, Lotfi; Turki, Manel

2014-04-01

278

Architecture of optical sensor for recognition of multiple toxic metal ions from water.  

Science.gov (United States)

Here, we designed novel optical sensor based on the wormhole hexagonal mesoporous core/multi-shell silica nanoparticles that enabled the selective recognition and removal of these extremely toxic metals from drinking water. The surface-coating process of a mesoporous core/double-shell silica platforms by several consequence decorations using a cationic surfactant with double alkyl tails (CS-DAT) and then a synthesized dicarboxylate 1,5-diphenyl-3-thiocarbazone (III) signaling probe enabled us to create a unique hierarchical multi-shell sensor. In this design, the high loading capacity and wrapping of the CS-DAT and III organic moieties could be achieved, leading to the formation of silica core with multi-shells that formed from double-silica, CS-DAT, and III dressing layers. In this sensing system, notable changes in color and reflectance intensity of the multi-shelled sensor for Cu(2+), Co(2+), Cd(2+), and Hg(2+) ions, were observed at pH 2, 8, 9.5 and 11.5, respectively. The multi-shelled sensor is added to enable accessibility for continuous monitoring of several different toxic metal ions and efficient multi-ion sensing and removal capabilities with respect to reversibility, selectivity, and signal stability. PMID:23856314

Shenashen, M A; El-Safty, S A; Elshehy, E A

2013-09-15

279

????????? ?????? ?????????? ???????? ???????? ?? ???? Semantic Web  

Digital Repository Infrastructure Vision for European Research (DRIVER)

?????????? ?????????? ???????????? ???? Semantic Web ?? ???????? ???????? ????????. ????????????? ??????? ?????? ???? ???????? ???????? ?? ???? Educational Semantic Web. ???????? ??????????? ???????? ??????????????? ??????????? ???????? ???????????????? ???? ?? ?????????? ????...

??????, ?. ?.; ??????, ?. ?.; Koren, O. M.

2011-01-01

280

Energy Efficient Security Architecture for Wireless BioMedical Sensor Networks  

CERN Document Server

Latest developments in VLSI, wireless communications, and biomedical sensing devices allow very small, lightweight, low power, intelligent sensing devices called biosensors. A set of these devices can be integrated into a Wireless Biomedical Sensor Network (WBSN), a new breakthrough technology used in telemedicine for monitoring the physiological condition of an individual. The biosensor nodes in WBSN has got resource limitations in terms of battery lifetime, CPU processing capability, and memory capacity. Replacement or recharging of batteries on thousands of biosensor nodes is quiet difficult or too costly. So, a key challenge in wireless biomedical sensor networks is the reduction of energy and memory consumption. Considering, the sensitivity of information in WBSN, we must provide security and patient privacy, as it is an important issue in the design of such systems. Hence this paper proposes an energy efficient security protocol for WBSN where security is provided to the physiological data, which is bei...

Mukesh, Rajeswari; Bharathi, V Subbiah

2009-01-01

 
 
 
 
281

Composite Design Pattern for Feature Oriented Service Injection and Composition of Web Services for Distributed Computing Systems with Service Oriented Architecture  

Directory of Open Access Journals (Sweden)

Full Text Available With the advent of newly introduced programming models like Feature-Oriented Programming (FOP, we feel that it will be more flexible to include the new service invocation function into the service providing server as a Feature Module for the self-adaptive distributed systems. A composite design patterns shows a synergy that makes the composition more than just the sum of its parts which leads to ready-made software architectures. In this paper we describe the amalgamation of Visitor and Case-Based Reasoning Design Patterns to the development of the Service Invocation and Web Services Composition through SOA with the help of JWS technologies and FOP. As far as we know, there are no studies on composition of design patterns for self adaptive distributed computing domain. We have provided with the sample code developed for the application and simple UML class diagram is used to describe the architecture.

Vishnuvardhan Mannava

2012-08-01

282

A QoS-Driven Self-Adaptive Architecture For Wireless Sensor Networks  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Recently, Wireless Sensor Networks (WSN) have become increasingly used to perform distributed sensing and convey useful information. These kinds of environments are complex, heterogeneous and often affected by unpredictable behavior and poor management. This fostered considerable research on designs and techniques that enhance these systems with an adaptation behavior. In this paper, we focus on the self-adaptation branch of the research and give an overview of the current existing approaches...

Jemal, Ahmed; Ben Halima, Riadh

2013-01-01

283

Web service QoS Based Broker Architecture and Heuristic Algorithm applied for an Apartment Management system  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Web Services are based on distributed technology and provide standard means of interoperating between different software applications across and within organizational boundaries. Web Services technologies allow interaction between applications. Sometimes a single service given alone does not meet user’s needs. In this case, it is necessary to compose several services in order to achieve the user’s goal. Quality of Service (QoS) support in web services plays a great role for the success of...

Prof.SushmaA Shirke; Prof.Sharayu Lokhande; Prof.Rushali Patil

2012-01-01

284

A Development Architecture for Serious Games Using BCI (Brain Computer Interface Sensors  

Directory of Open Access Journals (Sweden)

Full Text Available Games that use brainwaves via brain–computer interface (BCI devices, to improve brain functions are known as BCI serious games. Due to the difficulty of developing BCI serious games, various BCI engines and authoring tools are required, and these reduce the development time and cost. However, it is desirable to reduce the amount of technical knowledge of brain functions and BCI devices needed by game developers. Moreover, a systematic BCI serious game development process is required. In this paper, we present a methodology for the development of BCI serious games. We describe an architecture, authoring tools, and development process of the proposed methodology, and apply it to a game development approach for patients with mild cognitive impairment as an example. This application demonstrates that BCI serious games can be developed on the basis of expert-verified theories.

Kyhyun Um

2012-11-01

285

Applications and methods utilizing the Simple Semantic Web Architecture and Protocol (SSWAP for bioinformatics resource discovery and disparate data and service integration  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Scientific data integration and computational service discovery are challenges for the bioinformatic community. This process is made more difficult by the separate and independent construction of biological databases, which makes the exchange of data between information resources difficult and labor intensive. A recently described semantic web protocol, the Simple Semantic Web Architecture and Protocol (SSWAP; pronounced "swap" offers the ability to describe data and services in a semantically meaningful way. We report how three major information resources (Gramene, SoyBase and the Legume Information System [LIS] used SSWAP to semantically describe selected data and web services. Methods We selected high-priority Quantitative Trait Locus (QTL, genomic mapping, trait, phenotypic, and sequence data and associated services such as BLAST for publication, data retrieval, and service invocation via semantic web services. Data and services were mapped to concepts and categories as implemented in legacy and de novo community ontologies. We used SSWAP to express these offerings in OWL Web Ontology Language (OWL, Resource Description Framework (RDF and eXtensible Markup Language (XML documents, which are appropriate for their semantic discovery and retrieval. We implemented SSWAP services to respond to web queries and return data. These services are registered with the SSWAP Discovery Server and are available for semantic discovery at http://sswap.info. Results A total of ten services delivering QTL information from Gramene were created. From SoyBase, we created six services delivering information about soybean QTLs, and seven services delivering genetic locus information. For LIS we constructed three services, two of which allow the retrieval of DNA and RNA FASTA sequences with the third service providing nucleic acid sequence comparison capability (BLAST. Conclusions The need for semantic integration technologies has preceded available solutions. We report the feasibility of mapping high priority data from local, independent, idiosyncratic data schemas to common shared concepts as implemented in web-accessible ontologies. These mappings are then amenable for use in semantic web services. Our implementation of approximately two dozen services means that biological data at three large information resources (Gramene, SoyBase, and LIS is available for programmatic access, semantic searching, and enhanced interaction between the separate missions of these resources.

Nelson Rex T

2010-06-01

286

A Low Cost, Online, Computer Controlled Robot Architecture Using a CCTV Network as Sensors  

Directory of Open Access Journals (Sweden)

Full Text Available An important deterrent in deployment of robots in factories across the globe is the cost involved. A rather large part of that cost is the sensors which are also very unreliable and least robust. This paper proposes a cheaper, simpler and more dynamic robot prototype by using the factory’s existing CCTV cameras as the primary sensing equipment. Image Processing and total control of the robot(s is handled by a computer. Using a server-client model, the robot(s can also be controlled online. The software for the prototype was developed in MATLAB. This system is easily reprogrammable and deployable in a vast range of situations.

Abhinav Gupta

2007-10-01

287

Architectural solutions of conformal network-centric staring-sensor systems with spherical field of view  

CERN Document Server

The article presents the concept of network-centric conformal electro-optical systems construction with spherical field of view. It discusses abstract passive distributed electro-optical systems with focal array detectors based on a group of moving objects distributed in space. The system performs conformal processing of information from sensor matrix in a single event coordinate-time field. Unequivocally the construction of the systems which satisfy the different criteria of optimality is very complicated and requires special approaches to their development and design. The paper briefly touches upon key questions (in the authors' opinion) in the synthesis of such systems that meet different criteria of optimality. The synthesis of such systems is discussed by authors with the systematic and synergy approaches.

Makarenko, A V

2011-01-01

288

Architecture and Implementation of Real Time Vehicle Tracking System Using Wireless, Sensor Devices and Google Maps API  

Directory of Open Access Journals (Sweden)

Full Text Available The integration of different technologies potentially provides support to wide variety of applications and systems with vastly varying requirements and characteristics. Vehicle tracking system is one of such applications possible by embedding wireless sensor devices on the vehicles. The motor carrier industry has been investing in and implementing vehicle tracking, for a number of reasons, particularly the increase in efficiency achieved through better management of both personnel (drivers and assets (trucks or, as they are known, tractors; cargo loads; and trailers. Recently, Vehicle Tracking Systems (VTS are developed and deployed in numerous environments. These systems are capable of transmitting vehicle’s location information and other custom parameters in real time. In these systems, the device installed in the vehicle can transmit the location information, speed of the vehicle at that particular instance, total kilometer run of the vehicle, ignition status, battery status and many other custom parameters in real time to a remote data centre using SDCP protocol. In this paper, we present the design and implementation of a real time VTS that incorporates a hardware device installed in the vehicle and a remote data center with tracking sever and a web application with Google Maps API to depict the trail of the vehicle.

Khizar Ahmed Syed

2012-12-01

289

Personalized Web Services for Web Information Extraction  

CERN Document Server

The field of information extraction from the Web emerged with the growth of the Web and the multiplication of online data sources. This paper is an analysis of information extraction methods. It presents a service oriented approach for web information extraction considering both web data management and extraction services. Then we propose an SOA based architecture to enhance flexibility and on-the-fly modification of web extraction services. An implementation of the proposed architecture is proposed on the middleware level of Java Enterprise Edition (JEE) servers.

Jarir, Zahi; Erradi, Mahammed

2011-01-01

290

Crowdsourcing, citizen sensing and Sensor Web technologies for public and environmental health surveillance and crisis management: trends, OGC standards and application examples  

LENUS (Irish Health Repository)

Abstract \\'Wikification of GIS by the masses\\' is a phrase-term first coined by Kamel Boulos in 2005, two years earlier than Goodchild\\'s term \\'Volunteered Geographic Information\\'. Six years later (2005-2011), OpenStreetMap and Google Earth (GE) are now full-fledged, crowdsourced \\'Wikipedias of the Earth\\' par excellence, with millions of users contributing their own layers to GE, attaching photos, videos, notes and even 3-D (three dimensional) models to locations in GE. From using Twitter in participatory sensing and bicycle-mounted sensors in pervasive environmental sensing, to creating a 100,000-sensor geo-mashup using Semantic Web technology, to the 3-D visualisation of indoor and outdoor surveillance data in real-time and the development of next-generation, collaborative natural user interfaces that will power the spatially-enabled public health and emergency situation rooms of the future, where sensor data and citizen reports can be triaged and acted upon in real-time by distributed teams of professionals, this paper offers a comprehensive state-of-the-art review of the overlapping domains of the Sensor Web, citizen sensing and \\'human-in-the-loop sensing\\' in the era of the Mobile and Social Web, and the roles these domains can play in environmental and public health surveillance and crisis\\/disaster informatics. We provide an in-depth review of the key issues and trends in these areas, the challenges faced when reasoning and making decisions with real-time crowdsourced data (such as issues of information overload, "noise", misinformation, bias and trust), the core technologies and Open Geospatial Consortium (OGC) standards involved (Sensor Web Enablement and Open GeoSMS), as well as a few outstanding project implementation examples from around the world.

Kamel Boulos, Maged N

2011-12-21

291

Crowdsourcing, citizen sensing and sensor web technologies for public and environmental health surveillance and crisis management: trends, OGC standards and application examples  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract 'Wikification of GIS by the masses' is a phrase-term first coined by Kamel Boulos in 2005, two years earlier than Goodchild's term 'Volunteered Geographic Information'. Six years later (2005-2011, OpenStreetMap and Google Earth (GE are now full-fledged, crowdsourced 'Wikipedias of the Earth' par excellence, with millions of users contributing their own layers to GE, attaching photos, videos, notes and even 3-D (three dimensional models to locations in GE. From using Twitter in participatory sensing and bicycle-mounted sensors in pervasive environmental sensing, to creating a 100,000-sensor geo-mashup using Semantic Web technology, to the 3-D visualisation of indoor and outdoor surveillance data in real-time and the development of next-generation, collaborative natural user interfaces that will power the spatially-enabled public health and emergency situation rooms of the future, where sensor data and citizen reports can be triaged and acted upon in real-time by distributed teams of professionals, this paper offers a comprehensive state-of-the-art review of the overlapping domains of the Sensor Web, citizen sensing and 'human-in-the-loop sensing' in the era of the Mobile and Social Web, and the roles these domains can play in environmental and public health surveillance and crisis/disaster informatics. We provide an in-depth review of the key issues and trends in these areas, the challenges faced when reasoning and making decisions with real-time crowdsourced data (such as issues of information overload, "noise", misinformation, bias and trust, the core technologies and Open Geospatial Consortium (OGC standards involved (Sensor Web Enablement and Open GeoSMS, as well as a few outstanding project implementation examples from around the world.

Kamel Boulos Maged N

2011-12-01

292

Crowdsourcing, citizen sensing and sensor web technologies for public and environmental health surveillance and crisis management: trends, OGC standards and application examples  

Science.gov (United States)

'Wikification of GIS by the masses' is a phrase-term first coined by Kamel Boulos in 2005, two years earlier than Goodchild's term 'Volunteered Geographic Information'. Six years later (2005-2011), OpenStreetMap and Google Earth (GE) are now full-fledged, crowdsourced 'Wikipedias of the Earth' par excellence, with millions of users contributing their own layers to GE, attaching photos, videos, notes and even 3-D (three dimensional) models to locations in GE. From using Twitter in participatory sensing and bicycle-mounted sensors in pervasive environmental sensing, to creating a 100,000-sensor geo-mashup using Semantic Web technology, to the 3-D visualisation of indoor and outdoor surveillance data in real-time and the development of next-generation, collaborative natural user interfaces that will power the spatially-enabled public health and emergency situation rooms of the future, where sensor data and citizen reports can be triaged and acted upon in real-time by distributed teams of professionals, this paper offers a comprehensive state-of-the-art review of the overlapping domains of the Sensor Web, citizen sensing and 'human-in-the-loop sensing' in the era of the Mobile and Social Web, and the roles these domains can play in environmental and public health surveillance and crisis/disaster informatics. We provide an in-depth review of the key issues and trends in these areas, the challenges faced when reasoning and making decisions with real-time crowdsourced data (such as issues of information overload, "noise", misinformation, bias and trust), the core technologies and Open Geospatial Consortium (OGC) standards involved (Sensor Web Enablement and Open GeoSMS), as well as a few outstanding project implementation examples from around the world. PMID:22188675

2011-01-01

293

Development of a real-time clinical decision support system upon the web mvc-based architecture for prostate cancer treatment  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background A real-time clinical decision support system (RTCDSS with interactive diagrams enables clinicians to instantly and efficiently track patients' clinical records (PCRs and improve their quality of clinical care. We propose a RTCDSS to process online clinical informatics from multiple databases for clinical decision making in the treatment of prostate cancer based on Web Model-View-Controller (MVC architecture, by which the system can easily be adapted to different diseases and applications. Methods We designed a framework upon the Web MVC-based architecture in which the reusable and extractable models can be conveniently adapted to other hospital information systems and which allows for efficient database integration. Then, we determined the clinical variables of the prostate cancer treatment based on participating clinicians' opinions and developed a computational model to determine the pretreatment parameters. Furthermore, the components of the RTCDSS integrated PCRs and decision factors for real-time analysis to provide evidence-based diagrams upon the clinician-oriented interface for visualization of treatment guidance and health risk assessment. Results The resulting system can improve quality of clinical treatment by allowing clinicians to concurrently analyze and evaluate the clinical markers of prostate cancer patients with instantaneous clinical data and evidence-based diagrams which can automatically identify pretreatment parameters. Moreover, the proposed RTCDSS can aid interactions between patients and clinicians. Conclusions Our proposed framework supports online clinical informatics, evaluates treatment risks, offers interactive guidance, and provides real-time reference for decision making in the treatment of prostate cancer. The developed clinician-oriented interface can assist clinicians in conveniently presenting evidence-based information to patients and can be readily adapted to an existing hospital information system and be easily applied in other chronic diseases.

Liang Wen-Miin

2011-03-01

294

Key Architecture Elements of a Great Observatory for Space Physics  

Science.gov (United States)

Many different virtual observatories or grid systems are emerging to fulfill the growing demands of multi- spacecraft, distributed, communications-intensive, adaptive mission architectures. We have introduced the data-model-HPC-sensor rubric to clarify the relationships of such systems and to highlight the great potential for data-driven science.* Key architecture elements of a Great Observatory for space physics can then be framed within the broad categories of (1) services grid [service oriented architecture (SOA), including Web Services], (2) knowledge grid [ontology inference layer, unified schema, data mining], (3) computation grid, and (4) sensor grid [e.g., multi-node, dynamically adaptive, observing systems or "sensor webs"]. Complementing this with tools for end-to-end web-enabled publishing of and access to data, metadata, software and science results then brings the Great Observatory to every scientist's desktop both now and for the indefinite future. *Eastman, T., et al., eScience and Archiving, Data Science Journal, Vol. 4, Sept. 1, 2005, pp. 67-75.

Eastman, T. E.; Borne, K. D.

2006-05-01

295

Sensors  

...it Interests: optoelectronic technologies; photonic devices and sensors; nanophotonic integrated sensors; non linear integrated optics; microelectronic and nanoelectronic technologies Editor-in-Chief ...edu Interests: nanosensors; carbon nanotubes and graphene; nanoparticles; nanotoxicology; drug delivery * Section 'Biosensors' Managing Editor Ms. Lucy Lu ...CSEM SA, Research Center for Nanomedicine, Schulstrasse 1, CH-7302 Landquart, Switzerland; Professor of Optoelectronics, Institute for Microtechnology, University of Neuchâtel, Switzerland; ...image sensors; smart pixels; high-performance photosensing; low-noise; high-speed and high-dynamic-range image sensing; photonic microsystems; optical metrology and measurement systems; optical time-of-flight 3D ...

296

Crowdsourcing, citizen sensing and Sensor Web technologies for public and environmental health surveillance and crisis management: trends, OGC standards and application examples  

Energy Technology Data Exchange (ETDEWEB)

The PIE Activity Awareness Environment is designed to be an adaptive data triage and decision support tool that allows role and activity based situation awareness through a dynamic, trainable filtering system. This paper discusses the process and methodology involved in the application as well as some of its capabilities. 'Wikification of GIS by the masses' is a phrase-term first coined by Kamel Boulos in 2005, two years earlier than Goodchild's term 'Volunteered Geographic Information'. Six years later (2005-2011), OpenStreetMap and Google Earth (GE) are now full-fledged, crowdsourced 'Wikipedias of the Earth' par excellence, with millions of users contributing their own layers to GE, attaching photos, videos, notes and even 3-D (three dimensional) models to locations in GE. From using Twitter in participatory sensing and bicycle-mounted sensors in pervasive environmental sensing, to creating a 100,000-sensor geo-mashup using Semantic Web technology, to the 3-D visualisation of indoor and outdoor surveillance data in real-time and the development of next-generation, collaborative natural user interfaces that will power the spatially-enabled public health and emergency situation rooms of the future, where sensor data and citizen reports can be triaged and acted upon in real-time by distributed teams of professionals, this paper offers a comprehensive state-of-the-art review of the overlapping domains of the Sensor Web, citizen sensing and 'human-in-the-loop sensing' in the era of the Mobile and Social Web, and the roles these domains can play in environmental and public health surveillance and crisis/disaster informatics. We provide an in-depth review of the key issues and trends in these areas, the challenges faced when reasoning and making decisions with real-time crowdsourced data (such as issues of information overload, 'noise', misinformation, bias and trust), the core technologies and Open Geospatial Consortium (OGC) standards involved (Sensor Web Enablement and Open GeoSMS), as well as a few outstanding project implementation examples from around the world.

Kamel Boulos, Maged; Resch, Bernd; Crowley, David N.; Breslin, John G.; Sohn, Gunho; Burtner, Edwin R.; Pike, William A.; Jeziersk, Eduardo; Slayer Chuang, Kuo Yu

2011-12-21

297

ACTIVE-EYES: an adaptive pixel-by-pixel image-segmentation sensor architecture for high-dynamic-range hyperspectral imaging.  

Science.gov (United States)

The ACTIVE-EYES (adaptive control for thermal imagers via electro-optic elements to yield an enhanced sensor) architecture, an adaptive image-segmentation and processing architecture, based on digital micromirror (DMD) array technology, is described. The concept provides efficient front-end processing of multispectral image data by adaptively segmenting and routing portions of the scene data concurrently to an imager and a spectrometer. The goal is to provide a large reduction in the amount of data required to be sensed in a multispectral imager by means of preprocessing the data to extract the most useful spatial and spectral information during detection. The DMD array provides the flexibility to perform a wide range of spatial and spectral analyses on the scene data. The spatial and spectral processing for different portions of the input scene can be tailored in real time to achieve a variety of preprocessing functions. Since the detected intensity of individual pixels may be controlled, the spatial image can be analyzed with gain varied on a pixel-by-pixel basis to enhance dynamic range. Coarse or fine spectral resolution can be achieved in the spectrometer by use of dynamically controllable or addressable dispersion elements. An experimental prototype, which demonstrated the segmentation between an imager and a grating spectrometer, was demonstrated and shown to achieve programmable pixelated intensity control. An information theoretic analysis of the dynamic-range control aspect was conducted to predict the performance enhancements that might be achieved with this architecture. The results indicate that, with a properly configured algorithm, the concept achieves the greatest relative information recovery from a detected image when the scene is made up of a relatively large area of moderate-dynamic-range pixels and a relatively smaller area of strong pixels that would tend to saturate a conventional sensor. PMID:12389978

Christensen, Marc P; Euliss, Gary W; McFadden, Michael J; Coyle, Kevin M; Milojkovic, Predrag; Haney, Michael W; van der Gracht, Joeseph; Athale, Ravindra A

2002-10-10

298

WHAT IS INFORMATION ARCHITECTURE?  

Directory of Open Access Journals (Sweden)

Full Text Available The research takes a bibliographical and exploratory and consisted of a broad theoretical framework about the issues of Information Architecture and Information Architecture for the Web, listing the definitions, methodologies and assumptions as measured by several researchers. Aims to clarify concepts and terms about what becomes of Information Architecture for Web, aiming to disseminate information within this theme, since it has been hard enough on entering various areas of knowledge, whether in Information Science, Communication, Library Design, and human-computer interaction and others.

Maria Amélia Teixeira da Silva

2011-07-01

299

A Content Standard for Computational Models; Digital Rights Management (DRM) Architectures; A Digital Object Approach to Interoperable Rights Management: Finely-Grained Policy Enforcement Enabled by a Digital Object Infrastructure; LOCKSS: A Permanent Web Publishing and Access System; Tapestry of Time and Terrain.  

Science.gov (United States)

Includes five articles. Topics include requirements for a content standard to describe computational models; architectures for digital rights management systems; access control for digital information objects; LOCKSS (Lots of Copies Keep Stuff Safe) that allows libraries to run Web caches for specific journals; and a Web site from the U.S.…

Hill, Linda L.; Crosier, Scott J.; Smith, Terrence R.; Goodchild, Michael; Iannella, Renato; Erickson, John S.; Reich, Vicky; Rosenthal, David S. H.

2001-01-01

300

Architecture and Protocol of a Semantic System Designed for Video Tagging with Sensor Data in Mobile Devices  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Current mobile phones come with several sensors and powerful video cameras. These video cameras can be used to capture good quality scenes, which can be complemented with the information gathered by the sensors also embedded in the phones. For example, the surroundings of a beach recorded by the camera of the mobile phone, jointly with the temperature of the site can let users know via the Internet if the weather is nice enough to swim. In this paper, we present a system that tags the video f...

Alvaro Suarez; Miguel Garcia; Elsa Macias; Jaime Lloret

2012-01-01

 
 
 
 
301

ARCOMEM Crawling Architecture  

Directory of Open Access Journals (Sweden)

Full Text Available The World Wide Web is the largest information repository available today. However, this information is very volatile and Web archiving is essential to preserve it for the future. Existing approaches to Web archiving are based on simple definitions of the scope of Web pages to crawl and are limited to basic interactions with Web servers. The aim of the ARCOMEM project is to overcome these limitations and to provide flexible, adaptive and intelligent content acquisition, relying on social media to create topical Web archives. In this article, we focus on ARCOMEM’s crawling architecture. We introduce the overall architecture and we describe its modules, such as the online analysis module, which computes a priority for the Web pages to be crawled, and the Application-Aware Helper which takes into account the type of Web sites and applications to extract structure from crawled content. We also describe a large-scale distributed crawler that has been developed, as well as the modifications we have implemented to adapt Heritrix, an open source crawler, to the needs of the project. Our experimental results from real crawls show that ARCOMEM’s crawling architecture is effective in acquiring focused information about a topic and leveraging the information from social media.

Vassilis Plachouras

2014-08-01

302

Architecture and Protocol of a Semantic System Designed for Video Tagging with Sensor Data in Mobile Devices  

Directory of Open Access Journals (Sweden)

Full Text Available Current mobile phones come with several sensors and powerful video cameras. These video cameras can be used to capture good quality scenes, which can be complemented with the information gathered by the sensors also embedded in the phones. For example, the surroundings of a beach recorded by the camera of the mobile phone, jointly with the temperature of the site can let users know via the Internet if the weather is nice enough to swim. In this paper, we present a system that tags the video frames of the video recorded from mobile phones with the data collected by the embedded sensors. The tagged video is uploaded to a video server, which is placed on the Internet and is accessible by any user. The proposed system uses a semantic approach with the stored information in order to make easy and efficient video searches. Our experimental results show that it is possible to tag video frames in real time and send the tagged video to the server with very low packet delay variations. As far as we know there is not any other application developed as the one presented in this paper.

Alvaro Suarez

2012-02-01

303

Architecture and protocol of a semantic system designed for video tagging with sensor data in mobile devices.  

Science.gov (United States)

Current mobile phones come with several sensors and powerful video cameras. These video cameras can be used to capture good quality scenes, which can be complemented with the information gathered by the sensors also embedded in the phones. For example, the surroundings of a beach recorded by the camera of the mobile phone, jointly with the temperature of the site can let users know via the Internet if the weather is nice enough to swim. In this paper, we present a system that tags the video frames of the video recorded from mobile phones with the data collected by the embedded sensors. The tagged video is uploaded to a video server, which is placed on the Internet and is accessible by any user. The proposed system uses a semantic approach with the stored information in order to make easy and efficient video searches. Our experimental results show that it is possible to tag video frames in real time and send the tagged video to the server with very low packet delay variations. As far as we know there is not any other application developed as the one presented in this paper. PMID:22438753

Macias, Elsa; Lloret, Jaime; Suarez, Alvaro; Garcia, Miguel

2012-01-01

304

Personalised wearable cardiac sensor services for pervasive self-care  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The aim of the thesis is to design a web services architecture that shall support the automatic determination of a personalised sensor-system, which is embedded in smart garments, and which shall be used in self-care in order to allow a profane user to record himself a personal electrocardiogram (ECG), at anytime and anywhere. The main challenge consists in the intelligent and dynamic orchestration of context-aware business services that supply the user with an optimal personalised solution, ...

Krupaviciute, Asta

2011-01-01

305

Networking Sensor Observations, Forecast Models & Data Analysis Tools  

Science.gov (United States)

This presentation explores the interaction between sensor webs and forecast models and data analysis processes within service oriented architectures (SOA). Earth observation data from surface monitors and satellite sensors and output from earth science models are increasingly available through open interfaces that adhere to web standards, such as the OGC Web Coverage Service (WCS), OGC Sensor Observation Service (SOS), OGC Web Processing Service (WPS), SOAP-Web Services Description Language (WSDL), or RESTful web services. We examine the implementation of these standards from the perspective of forecast models and analysis tools. Interoperable interfaces for model inputs, outputs, and settings are defined with the purpose of connecting them with data access services in service oriented frameworks. We review current best practices in modular modeling, such as OpenMI and ESMF/Mapl, and examine the applicability of those practices to service oriented sensor webs. In particular, we apply sensor-model-analysis interfaces within the context of wildfire smoke analysis and forecasting scenario used in the recent GEOSS Architecture Implementation Pilot. Fire locations derived from satellites and surface observations and reconciled through a US Forest Service SOAP web service are used to initialize a CALPUFF smoke forecast model. The results of the smoke forecast model are served through an OGC WCS interface that is accessed from an analysis tool that extract areas of high particulate matter concentrations and a data comparison tool that compares the forecasted smoke with Unattended Aerial System (UAS) collected imagery and satellite-derived aerosol indices. An OGC WPS that calculates population statistics based on polygon areas is used with the extract area of high particulate matter to derive information on the population expected to be impacted by smoke from the wildfires. We described the process for enabling the fire location, smoke forecast, smoke observation, and population statistics services to be registered with the GEOSS registry and made findable through the GEOSS Clearinghouse. The fusion of data sources and different web service interfaces illustrate the agility in using standard interfaces and help define the type of input and output interfaces needed to connect models and analysis tools within sensor webs.

Falke, S. R.; Roberts, G.; Sullivan, D.; Dibner, P. C.; Husar, R. B.

2009-12-01

306

Web Robots and Web Mining  

Science.gov (United States)

Manually indexing the World Wide Web is obviously an impossible task, and it is even a daunting challenge for automated techniques. Web content mining is a general term used to describe these techniques, which are intended for information categorization and filtering. Web robots serve a variety of purposes, including indexing; and they can be useful or, in some cases, harmful. Web usage mining, on the other hand, is used to determine how a Web site's structure and organization effect the way users navigate the site.The Web Robots Pages (1) is an excellent starting place to learn about these automated programs. Several hundred robots are documented in a database, and a selection of papers considers proper ethics and guidelines for using robots, among other things. An article on Web mining and its subclasses is given on DM Review (2). It describes the basics of Web analysis and outlines many benefits Web mining can offer. A course homepage on Web data mining from DePaul University (3) offers a broad selection of reading material on the subject. Mostly consisting of research papers and journal articles, the documents range from general applications to specific theories and case studies. Two computer scientists from Polytechnic University propose a robust, distributed Web crawler (another term for Web robot), intended for large-scale network interaction (4). The twelve page paper begins with the motivation for the project, and continues with a full description of the system architecture and implementation. The November 2002 issue of Computer magazine featured an article on Data Mining for Web Intelligence (5). It points out that today's Internet is lacking in many key aspects, and that Web mining will play an important role in the development of improved search engines and automatic document classification. A short poster presentation from the 2002 International World Wide Web Conference (6) introduces GeniMiner, a Web search strategy based on a genetic algorithm. GeniMiner operates on the premise of finding a nearly optimal solution in order to minimize manual analysis of the search results. KDnuggets (7) is a free, biweekly newsletter on data and Web mining. In recent issues, special attention has been given to the Total Information Awareness project, which is investigating ways of mining the Web and email for possible information about terrorist activity. Web robots are occasionally used for malicious purposes, namely to automatically register for free email or participate in online polls. A technology that was developed to counter these robots involved using a blurred or distorted word to gain access, which could easily be read by a human but would be impossible for a robot to read. In a press release from the University of California at Berkeley (8), researchers have discovered a way to allow Web robots to crack this security system. The article describes how it was accomplished and provides motivation for more advanced security measures.

Leske, Cavin.

2003-01-01

307

An integration platform for heterogeneous sensor systems in GITEWS – Tsunami Service Bus  

Directory of Open Access Journals (Sweden)

Full Text Available The German Indonesian Tsunami Early Warning System (GITEWS is built upon a complex sensor data infrastructure. To best fulfill the demand for a long living system, the underlying software and hardware architecture of GITEWS must be prepared for future modifications both of single sensors and entire sensors systems.

The foundation for a flexible integration and for stable interfaces is a result of following the paradigm of a Service Oriented Architecture (SOA. The Tsunami Service Bus (TSB – our integration platform in GITEWS – realizes this SOA approach by implementing the Sensor Web Enablement (SWE standards and services.

This paper focuses on architectural and implementation aspects of the TSB. Initially, the general architectural approach in GITEWS by SOA and SWE is presented. Based on this conception, the concrete system architecture of GITEWS is introduced. The sensor integration platform TSB is then discussed in detail, following by its primary responsibilities and components. Special emphasis is laid on architectural transparency, comprehensible design decisions, and references to the applied technology.

J. Fleischer

2010-06-01

308

An integration platform for heterogeneous sensor systems in GITEWS - Tsunami Service Bus  

Science.gov (United States)

The German Indonesian Tsunami Early Warning System (GITEWS) is built upon a complex sensor data infrastructure. To best fulfill the demand for a long living system, the underlying software and hardware architecture of GITEWS must be prepared for future modifications both of single sensors and entire sensors systems. The foundation for a flexible integration and for stable interfaces is a result of following the paradigm of a Service Oriented Architecture (SOA). The Tsunami Service Bus (TSB) - our integration platform in GITEWS - realizes this SOA approach by implementing the Sensor Web Enablement (SWE) standards and services. This paper focuses on architectural and implementation aspects of the TSB. Initially, the general architectural approach in GITEWS by SOA and SWE is presented. Based on this conception, the concrete system architecture of GITEWS is introduced. The sensor integration platform TSB is then discussed in detail, following by its primary responsibilities and components. Special emphasis is laid on architectural transparency, comprehensible design decisions, and references to the applied technology.

Fleischer, J.; Häner, R.; Herrnkind, S.; Kloth, A.; Kriegel, U.; Schwarting, H.; Wächter, J.

2010-06-01

309

A universal approach to electrically connecting nanowire arrays using nanoparticles—application to a novel gas sensor architecture  

Science.gov (United States)

We report on a novel, in situ approach toward connecting and electrically contacting vertically aligned nanowire arrays using conductive nanoparticles. The utility of the approach is demonstrated by development of a gas sensing device employing this nano-architecture. Well-aligned, single-crystalline zinc oxide nanowires were grown through a direct thermal evaporation process at 550 °C on gold catalyst layers. Electrical contact to the top of the nanowire array was established by creating a contiguous nanoparticle film through electrostatic attachment of conductive gold nanoparticles exclusively onto the tips of nanowires. A gas sensing device was constructed using such an arrangement and the nanowire assembly was found to be sensitive to both reducing (methanol) and oxidizing (nitrous oxides) gases. This assembly approach is amenable to any nanowire array for which a top contact electrode is needed.

Parthangal, Prahalad M.; Cavicchi, Richard E.; Zachariah, Michael R.

2006-08-01

310

A universal approach to electrically connecting nanowire arrays using nanoparticles-application to a novel gas sensor architecture  

International Nuclear Information System (INIS)

We report on a novel, in situ approach toward connecting and electrically contacting vertically aligned nanowire arrays using conductive nanoparticles. The utility of the approach is demonstrated by development of a gas sensing device employing this nano-architecture. Well-aligned, single-crystalline zinc oxide nanowires were grown through a direct thermal evaporation process at 550 deg. C on gold catalyst layers. Electrical contact to the top of the nanowire array was established by creating a contiguous nanoparticle film through electrostatic attachment of conductive gold nanoparticles exclusively onto the tips of nanowires. A gas sensing device was constructed using such an arrangement and the nanowire assembly was found to be sensitive to both reducing (methanol) and oxidizing (nitrous oxides) gases. This assembly approach is amenable to any nanowire array for which a top contact electrode is needed

311

Ajax Architecture Implementation Techniques  

Science.gov (United States)

Today's rich Web applications use a mix of Java Script and asynchronous communication with the application server. This mechanism is also known as Ajax: Asynchronous JavaScript and XML. The intent of Ajax is to exchange small pieces of data between the browser and the application server, and in doing so, use partial page refresh instead of reloading the entire Web page. AJAX (Asynchronous JavaScript and XML) is a powerful Web development model for browser-based Web applications. Technologies that form the AJAX model, such as XML, JavaScript, HTTP, and XHTML, are individually widely used and well known. However, AJAX combines these technologies to let Web pages retrieve small amounts of data from the server without having to reload the entire page. This capability makes Web pages more interactive and lets them behave like local applications. Web 2.0 enabled by the Ajax architecture has given rise to a new level of user interactivity through web browsers. Many new and extremely popular Web applications have been introduced such as Google Maps, Google Docs, Flickr, and so on. Ajax Toolkits such as Dojo allow web developers to build Web 2.0 applications quickly and with little effort.

Hussaini, Syed Asadullah; Tabassum, S. Nasira; Baig, Tabassum, M. Khader

2012-03-01

312

Architecture for Accessing Heterogeneous Databases  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents the architecture for accessing heterogeneous databases. Two major processes in this architecture which are extracting SQL statement and ontology. The algorithms for extracting SQL statement was created and tested in order to improve time performance during searching and retrieving process. Ontology approach was implemented and combined with these algorithms. In ontology approach, web semantic was implemented in order to retrieve only relevant data from database. A prototype based on this architecture was developed using JAVA technology. JAVA technology was chosen because this technology have Jena library. This library is provide API and support SPARQL. Several experiments have been executed and tested. The result indicates this architecture able to improve web query processing in term of time. The result also indicates this architecture able to retrieve and displayed more relevant data to web users.

Mohd Kamir Yusof

2012-02-01

313

Flexible Architecture of Ultra-Low-Power Current-Mode Interleaved Successive Approximation Analog-to-Digital Converter for Wireless Sensor Networks  

Directory of Open Access Journals (Sweden)

Full Text Available A novel 8-bit current mode interleaved successive approximation (SAR analog-digital converter (ADC has been proposed. The proposed converter architecture is very flexible. Using two control DC voltages and one reference current, the converter can be tuned to work with different sampling rates, number of bits of resolution, and power consumption levels. Due to its very low-power consumption and flexibility, the converter is particularly suitable for application in wireless sensor networks. Compared to other solutions presented in the literature, the proposed converter achieves very high figure of merit (FOM value due to numerous low-power circuit innovations utilized in its design. The circuit has been implemented in CMOS 0.18 μm technology. Minimum energy consumption has been found to be in a 25–250 kS/s range (for clock sampling frequency in a 200 kHz--2 MHz range for a single SAR section with the corresponding power dissipation varying from 220 nW to 560 nW for 0.55 V power supply.

K. Iniewski

2007-06-01

314

Art & Architecture  

Science.gov (United States)

This website was created by the Courtauld Institute of Art, a British institute created for the study of Western art. The website is "designed to be explored," and with over 40,000 images and a network of over 500,000 links, there's a great deal to explore. Because of the vast amount of content, visitors might find it helpful to first check out the link at the bottom of the page, entitled "About A&A". From there, click on the "How to Use the Art & Architecture Web Site". This extremely useful link has over a dozen categories of instruction, from "Basics" to "Search Tips" to "Profile and Preferences". The "Quizzes, Polls and Discussions" section on the left hand side of the page is a clever section with quizzes, such as those on the value of watercolors and polls. On the right hand side of the page the "Stories" area contains transcripts of fascinating interviews with artists and architects.

315

GOOSE: semantic search on internet connected sensors  

Science.gov (United States)

More and more sensors are getting Internet connected. Examples are cameras on cell phones, CCTV cameras for traffic control as well as dedicated security and defense sensor systems. Due to the steadily increasing data volume, human exploitation of all this sensor data is impossible for effective mission execution. Smart access to all sensor data acts as enabler for questions such as "Is there a person behind this building" or "Alert me when a vehicle approaches". The GOOSE concept has the ambition to provide the capability to search semantically for any relevant information within "all" (including imaging) sensor streams in the entire Internet of sensors. This is similar to the capability provided by presently available Internet search engines which enable the retrieval of information on "all" web pages on the Internet. In line with current Internet search engines any indexing services shall be utilized cross-domain. The two main challenge for GOOSE is the Semantic Gap and Scalability. The GOOSE architecture consists of five elements: (1) an online extraction of primitives on each sensor stream; (2) an indexing and search mechanism for these primitives; (3) a ontology based semantic matching module; (4) a top-down hypothesis verification mechanism and (5) a controlling man-machine interface. This paper reports on the initial GOOSE demonstrator, which consists of the MES multimedia analysis platform and the CORTEX action recognition module. It also provides an outlook into future GOOSE development.

Schutte, Klamer; Bomhof, Freek; Burghouts, Gertjan; van Diggelen, Jurriaan; Hiemstra, Peter; van't Hof, Jaap; Kraaij, Wessel; Pasman, Huib; Smith, Arthur; Versloot, Corne; de Wit, Joost

2013-05-01

316

Design and Characterisation of a Fast Architecture Providing Zero Suppressed Digital Output Integrated in a High Resolution CMOS Pixel Sensor for the STAR Vertex Detector and the EUDET Beam Telescope  

CERN Document Server

CMOS Monolithic Active Pixel Sensors (MAPS) have demonstrated their strong potential for tracking devices, particularly for flavour tagging. They are foreseen to equip several vertex detectors and beam telescopes. Most applications require high read-out speed, imposing sensors to feature digital output with integrated zero suppression. The most recent development of MAPS at IPHC and IRFU addressing this issue will be reviewed. An architecture will be presented, combining a pixel array, column-level discriminators and zero suppression circuits. Each pixel features a preamplifier and a correlated double sampling (CDS) micro-circuit reducing the temporal and fixed pattern noises. The sensor is fully programmable and can be monitored. It will equip experimental apparatus starting data taking in 2009/2010.

Hu-guo, C

2008-01-01

317

The definitive guide to HTML5 WebSocket  

CERN Document Server

The Definitive Guide to HTML5 WebSocket is the ultimate insider's WebSocket resource. This revolutionary new web technology enables you to harness the power of true real-time connectivity and build responsive, modern web applications.   This book contains everything web developers and architects need to know about WebSocket. It discusses how WebSocket-based architectures provide a dramatic reduction in unnecessary network overhead and latency compared to older HTTP (Ajax) architectures, how to layer widely used protocols such as XMPP and STOMP on top of WebSocket, and how to secure WebSocket c

Wang, Vanessa; Moskovits, Peter

2013-01-01

318

Sensors Weekly  

Science.gov (United States)

This is are very active web site devoted to the emerging technology area of sensors. It is updated continously, with technical articles, resources, and news about advances and new applications of sensor technology. It has seven major focus areas that are covered: electronics & computers, machine manufacturing, process industries, automotive, aerospace/military/homeland security, specialty markets, and wireless & M2M. This is an excellent source of up-to-date information about this technical area.

2011-02-23

319

Service-oriented high level architecture  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Service-oriented High Level Architecture (SOHLA) refers to the high level architecture (HLA) enabled by Service-Oriented Architecture (SOA) and Web Services etc. techniques which supports distributed interoperating services. The detailed comparisons between HLA and SOA are made to illustrate the importance of their combination. Then several key enhancements and changes of HLA Evolved Web Service API are introduced in comparison with native APIs, such as Federation Developmen...

Wang, Wenguang; Yu, Wenguang; Li, Qun; Wang, Weiping; Liu, Xichun

2009-01-01

320

DYNAMIC INVOCATION OF WEB SERVICES  

Directory of Open Access Journals (Sweden)

Full Text Available When we use web service, we should add it in the web reference and then call its methods statically. This way of calling web services has lots of limitations. In order to take maximum advantage of the flexibility and power of Web services, the user must be able to dynamically discover and invoke a Web service. We need to dynamically discover and invoke the service because the information returned from web services can be used by heterogeneous applications which are executed on different machines. As our business world is dynamic and heterogeneous, a client often needs to invoke an unfamiliar web service at run time. However, current web services technology pays little attention to this issue. In this paper, we propose a framework for a client to dynamically invoke web services. The framework can increase the use and reliability of web services invocation in a dynamic, heterogeneous environment. Web Service has been widely accepted by industry. How to find and integrate existing Web Service is a crucial work. Client finds Web Service from UDDI Registry and invokes it directly as described in a contract, web service description language, WSDL. It is difficult for an enterprise user to dynamically invoke the most appropriate Web Service. This paper briefly introduces Service-Oriented Architecture and discusses advantages and disadvantages of UDDI, then puts forward a dynamic Web Service framework that extends the SOA.

Tere G.M., Jadhav B.T. and Mudholkar R.R.

2012-03-01

 
 
 
 
321

The U.S. Geological Survey Geo Data Portal: A web service architecture and implementation for geo-climate data access and processing  

Science.gov (United States)

Environmental modelers from fields of study including climatology, hydrology, geology, and ecology need common, cross-discipline data sources and processing methods to enable working with large remote datasets. Watershed modelers, for example, need downscaled climate model data and land-cover data summaries to predict streamflow for various future climate scenarios. In turn, ecological modelers need the predicted streamflow conditions to understand how habitat of biotic communities might be affected. The U.S. Geological Survey Geo Data Portal project addresses these needs by providing a flexible application built on open-standard Web services that integrates and streamlines data retrieval and analysis. Open Geospatial Consortium Web Processing Services (WPS) were developed to allow interoperable access to data from servers delivering both defacto standard Climate and Forecast (CF) convention datasets and OGC standard Web Coverage Services (WCS). The Geo Data Portal can create commonly needed derivatives of data in numerous formats. As an example use case, a user can upload a shapefile specifying a region of interest (e.g. a watershed), pick a climate simulation, and retrieve a spreadsheet of predicted daily maximum temperature in that region up to 2100. Outcomes of the Geo Data Portal project support the rapid development of user interfaces for accessing and manipulating environmental data. The Geo Data Portal resulting from this project will be demonstrated accessing a range of climate and landscape data.

Kunicki, T.; Blodgett, D. L.; Booth, N. L.; Suftin, I.; Walker, J. I.

2011-12-01

322

75 FR 82011 - Web-Distributed Labeling of Pesticides  

Science.gov (United States)

...labeling without having to search through the Web site. A feature...specifics of the technological architecture used to implement the WDL...critical components in the architecture of the web- distributed labeling...the public to begin their search for web-distributed...

2010-12-29

323

Web Resources Annotation for the Web of Learning  

Directory of Open Access Journals (Sweden)

Full Text Available Semantic annotation of web resources is an essential ingredient to leverage the web of information to the semantic web where resources are easily shared and reused. In the education field, reusing hypermedia web resources can support to a great deal the design of modern instructional environments and the development of interactive and non-linear material for learning. Sharing and reusing these resources by different web applications and services presupposes that they are visible for retrieval through a semantic description of their content, function and relations with other resources. This paper presents the annotation and discovery of web resources to create learning objects that constitute the building blocks of learning sessions which are delivered to users in the Web of Learning. Semantic annotation is done by the contextual exploration method which analyzes web resources’ text descriptions and metadata in order to annotate automatically resources. We present the system architecture and a case study that illustrates the proposed approach.

Jawad Berri

2013-12-01

324

The Exploitation of Data from Remote and Human Sensors for Environment Monitoring in the SMAT Project  

Science.gov (United States)

In this paper, we outline the functionalities of a system that integrates and controls a fleet of Unmanned Aircraft Vehicles (UAVs). UAVs have a set of payload sensors employed for territorial surveillance, whose outputs are stored in the system and analysed by the data exploitation functions at different levels. In particular, we detail the second level data exploitation function whose aim is to improve the sensors data interpretation in the post-mission activities. It is concerned with the mosaicking of the aerial images and the cartography enrichment by human sensors—the social media users. We also describe the software architecture for the development of a mash-up (the integration of information and functionalities coming from the Web) and the possibility of using human sensors in the monitoring of the territory, a field in which, traditionally, the involved sensors were only the hardware ones. PMID:23247415

Meo, Rosa; Roglia, Elena; Bottino, Andrea

2012-01-01

325

Robot Electronics Architecture  

Science.gov (United States)

An electronics architecture has been developed to enable the rapid construction and testing of prototypes of robotic systems. This architecture is designed to be a research vehicle of great stability, reliability, and versatility. A system according to this architecture can easily be reconfigured (including expanded or contracted) to satisfy a variety of needs with respect to input, output, processing of data, sensing, actuation, and power. The architecture affords a variety of expandable input/output options that enable ready integration of instruments, actuators, sensors, and other devices as independent modular units. The separation of different electrical functions onto independent circuit boards facilitates the development of corresponding simple and modular software interfaces. As a result, both hardware and software can be made to expand or contract in modular fashion while expending a minimum of time and effort.

Garrett, Michael; Magnone, Lee; Aghazarian, Hrand; Baumgartner, Eric; Kennedy, Brett

2008-01-01

326

Knowledge Enhanced Searching on the Web  

Science.gov (United States)

The move towards a semantic web has been in progress for many years and more recently there have been applications that make use of semantic web technology. One of the features that made the Web so easy to use is the ability to search web pages in a matter of seconds through the use of search engines. Now that the use of OWL and RDF as a knowledge representation format is increasing, the possibility appears to improve the quality of searching by using the semantic web to enhance the 'ordinary' Web. This paper outlines an architecture for using distributed knowledge bases to assist and improve searching on the web.

Jaffri, Afraz

327

Collaborative web hosting challenges and research directions  

CERN Document Server

This brief presents a peer-to-peer (P2P) web-hosting infrastructure (named pWeb) that can transform networked, home-entertainment devices into lightweight collaborating Web servers for persistently storing and serving multimedia and web content. The issues addressed include ensuring content availability, Plexus routing and indexing, naming schemes, web ID, collaborative web search, network architecture and content indexing. In pWeb, user-generated voluminous multimedia content is proactively uploaded to a nearby network location (preferably within the same LAN or at least, within the same ISP)

Ahmed, Reaz

2014-01-01

328

Terra Harvest software architecture  

Science.gov (United States)

Under the Terra Harvest Program, the DIA has the objective of developing a universal Controller for the Unattended Ground Sensor (UGS) community. The mission is to define, implement, and thoroughly document an open architecture that universally supports UGS missions, integrating disparate systems, peripherals, etc. The Controller's inherent interoperability with numerous systems enables the integration of both legacy and future UGS System (UGSS) components, while the design's open architecture supports rapid third-party development to ensure operational readiness. The successful accomplishment of these objectives by the program's Phase 3b contractors is demonstrated via integration of the companies' respective plug-'n'-play contributions that include controllers, various peripherals, such as sensors, cameras, etc., and their associated software drivers. In order to independently validate the Terra Harvest architecture, L-3 Nova Engineering, along with its partner, the University of Dayton Research Institute, is developing the Terra Harvest Open Source Environment (THOSE), a Java Virtual Machine (JVM) running on an embedded Linux Operating System. The Use Cases on which the software is developed support the full range of UGS operational scenarios such as remote sensor triggering, image capture, and data exfiltration. The Team is additionally developing an ARM microprocessor-based evaluation platform that is both energy-efficient and operationally flexible. The paper describes the overall THOSE architecture, as well as the design decisions for some of the key software components. Development process for THOSE is discussed as well.

Humeniuk, Dave; Klawon, Kevin

2012-06-01

329

Miniaturized wireless sensor network  

CERN Document Server

This paper addresses an overview of the wireless sensor networks. It is shown that MEMS/NEMS technologies and SIP concept are well suited for advanced architectures. It is also shown analog architectures have to be compatible with digital signal techniques to develop smart network of microsystem.

Lecointre, Aubin; Dubuc, David; Katia, Grenier; Patrick, Pons; Aubert, Hervé; Muller, A; Berthou, Pascal; Gayraud, Thierry; Plana, Robert

2010-01-01

330

Use of World Wide Web and NCSA Mcsaic at Langley  

Science.gov (United States)

A brief history of the use of the World Wide Web at Langley Research Center is presented along with architecture of the Langley Web. Benefits derived from the Web and some Langley projects that have employed the World Wide Web are discussed.

Nelson, Michael

1994-01-01

331

Robotic Architectures  

Directory of Open Access Journals (Sweden)

Full Text Available In the development of mobile robotic systems, a robotic architecture plays a crucial role in interconnecting all the sub-systems and controlling the system. The design of robotic architectures for mobile autonomous robots is a challenging and complex task. With a number of existing architectures and tools to choose from, a review of the existing robotic architecture is essential. This paper surveys the different paradigms in robotic architectures. A classification of the existing robotic architectures and comparison of different proposals attributes and properties have been carried out. The paper also provides a view on the current state of designing robot architectures. It also proposes a conceptual model of a generalised robotic architecture for mobile autonomous robots.

Mbali Mtshali

2010-01-01

332

Process-aware web programming with Jolie  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We present a programming language and runtime, which extends the Jolie programming language, for the native modelling of process-aware web information systems, i.e., web information systems based upon the execution of business processes. Our main contribution is to offer a unifying approach for the programming of distributed architectures on the web, which can capture web servers, stateful process execution, and the composition of services via mediation in a system. We discu...

Montesi, Fabrizio

2014-01-01

333

Flash Support on Embedded Web Browsers  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This study aimed to resolve one of problems which face most of current embedded web browsers for example the web browser provided by MINIGUI which does not support Flash. The present study developed an embedded web browser the add flash on flash plug in interface. The designs based on Mozilla and Konqueror reference architecture, since these applications constitute a good sample of current web browser technology and are quite distinct from others as they are all based on different rendering e...

Kenguka Mohamed Kenguka; Atindimile Suleiman Kumchaya

2006-01-01

334

Integrating dynamic resources in corporate semantic web: an approach to enterprise application integration using semantic web services  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We present our experiment in integrating semantic web services in the existing semantic web server architecture used by the ACACIA team to implement corporate memories. We rely on CORESE, a semantic web search engine, to provide web applications based on the semantic web services it can identify. Thus, CORESE is used as a semantic UDDI registry and allows us to automatically discover and invoke corporate applications wrapped into semantically annotated web services. Using rules and an extensi...

Lo, Moussa; Gandon, Fabien

2006-01-01

335

Low Frequency Radioastronomy at Moon: possible approach and architecture  

Science.gov (United States)

The Moon, the Earth's neighbor, attracts an attention as a celestial body, as a source for mineral and other resources and as a possible base for fundamental scientific researches. The conducting ionosphere of Earth completely shields radioemissions coming from outer space and propagating at frequencies below a few MHz. In contrary, the Moon possessing a week atmosphereionosphere around its surface seems to be a perfect base for carrying out measurements of low frequency radio emissions originated from the space. The radio facility deployed at Moon's surface seems to be a powerful tool for various fundamental space researches related to astrophysics, solar system and magnetospheric investigations. The most intriguing objective is a search of terrestrial-like planets in the exosolar system, i.e. planets possessing the intrinsic magnetic fields and developed magnetospheres which interaction with the star wind results in generation of radioemissions (similar to AKR radiation of the terrestrial magnetosphere). Creating the infrastructure of antennas (sensors) on Moon's surface is planned for reaching the described goals. Ideology of such infrastructure (which may be treated as macro-instrument) is closely to SensorWeb approach. The different sensors are collected to unified platforms (PODs in terms of SensorWeb) which provide omni-and bidirectional information flows between PODs. Thus a set of sensors is integrated self-organizing amorphous organism on the base of wireless network. It increases reliability of the research complex and allows quick reconfiguring and adopting it for different investigation tasks. For additional redundancy and openness of the complex at least some PODs will support not only inter-PODs protocol but IEEE 802.16 Wireless LAN standard used in NASA Lunar Communication and Navigation Architecture also. The paper presents a possible approach to the development of the radio facility deployed at Moon's surface, its implementation for various fundamental researches

Skalsky, A.; Mogilevsky, M.; Nazarov, V.; Nazirov, R.; Batanov, O.; Sadovski, A.

2009-04-01

336

VLSI architecture  

Energy Technology Data Exchange (ETDEWEB)

This book is a collection of course papers which discusses the latest (1982) milestone of electronic building blocks and its effect on computer architecture. Contributions range from selecting a VLSI process technology to Japan's Fifth Generation Computer Architecture. Contents, abridged: VLSI and machine architecture. Graphic design aids: HED and FATFREDDY. On the LUCIFER system. Clocking of VLSI circuits. Decentralised computer architectures for VLSI. Index.

Randell, B.; Treleaven, P.C.

1983-01-01

337

Architecture vision and technologies for post-NPOESS weather prediction system: two-way interactive observing and modeling: Part II. Use case scenario  

Science.gov (United States)

This is a companion paper to "Architecture Vision and Technologies for post-NPOESS Weather Prediction System: Two-way Interactive Observing and Modeling". Our recently completed two-year NASA-sponsored study on Advanced Weather Forecasting Technologies concluded that it may be possible in the future to significantly extend the skill range of model based weather forecasting via a direct real-time two-way feedback between computer forecast models and highly networked, intelligent observing systems (Sensor Webs). The study group developed a high-level Weather Architecture to describe the system (see the companion paper). This paper describes application of the proposed Weather Architecture to a particular weather scenario-the US east coast Blizzard of January 24 and 25, 2000. The objective of the scenario exercise was to help clarify thinking on the architecture functions in light of realistic, tractable (1 to 5 day) forecast situations, and infrastructure and technologies that might be reasonably projected for 2015.

Higgins, Glenn J.; Kalb, Michael W.; Mahoney, Robert L.; Lutz, Robert; Mauk, Robin Y.; Seablom, Michael; Talabac, Stephen J.

2005-01-01

338

Architecture & Environment  

Science.gov (United States)

Most art teachers would agree that architecture is an important form of visual art, but they do not always include it in their curriculums. In this article, the authors share core ideas from "Architecture and Environment," a teaching resource that they developed out of a long-term interest in teaching architecture and their fascination with the…

Erickson, Mary; Delahunt, Michael

2010-01-01

339

Charlotte's Web  

Science.gov (United States)

Similar to how Charlotte uses her web to communicate, students create webs for short messages. They learn how spiders create their webs, and about the different types of webs they make. With this knowledge, students design and create their own webs and incorporate messages.

Center For Engineering Educational Outreach

340

Performative Urban Architecture : place-making in-between architecture and socio-technical systems  

DEFF Research Database (Denmark)

The paper explores how performative urban architecture can enhance community-making and public domain using socio-technical systems and digital technologies to constitute an urban reality. Digital medias developed for the web are now increasingly occupying the urban realm as a tool for navigating the physical world e.g. as exemplified by the Google Walk Score and the mobile extension of the Google Maps to the iPhone. At the same time the development in pervasive technologies and situated computing extends the build environment with digital feedback systems that are increasingly embedded and deployed using sensor technologies opening up for new access considerations in architecture as well as the ability for a local environment to act as real-time sources of information and facilities. Starting from the NoRA pavilion for the 10th International Architecture Biennale in Venice the paper discusses the perspectives of using interactive technologies for performative objects, which are able to register the impulses of urban activity and reproduce the contexts of the city. In this way the performative environment is established as an event setting providing an embodied experience as a ‘quasi-object' that can couple relationships between architecture, humans and society. These performative relationships between digital and physical environments are seen as illustrative of the social production of space by performance and the creative production of identity. The paper reflects on the perspectives of these performative environments to understand how the urban is forged in a manifold of actions and interactions and how performative objects can mediate relationships in changing social constellations.

Thomsen, Bo Stjerne; Jensen, Ole B.

 
 
 
 
341

Case and Relation (CARE) based Page Rank Algorithm for Semantic Web Search Engines  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Web information retrieval deals with a technique of finding relevant web pages for any given query from a collection of documents. Search engines have become the most helpful tool for obtaining useful information from the Internet. The next-generation Web architecture, represented by the Semantic Web, provides the layered architecture possibly allowing data to be reused across application. The proposed architecture use a hybrid methodology named Case and Relation (CARE) based Page Rank algori...

Preethi, N.; Devi, T.

2012-01-01

342

The Web of Things: A Survey (Invited Paper  

Directory of Open Access Journals (Sweden)

Full Text Available In the vision of the Internet of Things (IoT, an increasing number of embedded devices of all sorts (e.g., sensors, mobile phones, cameras, smart meters, smart cars, traffic lights, smart home appliances, etc. are now capable of communicating and sharing data over the Internet. Although the concept of using embedded systems to control devices, tools and appliances has been proposed for almost decades now, with every new generation, the ever-increasing capabilities of computation and communication pose new opportunities, but also new challenges. As IoT becomes an active research area, different methods from various points of view have been explored to promote the development and popularity of IoT. One trend is viewing IoT as Web of Things (WoT where the open Web standards are supported for information sharing and device interoperation. By penetrating smart things into existing Web, the conventional web services are enriched with physical world services. This WoT vision enables a new way of narrowing the barrier between virtual and physical worlds.In this paper, we elaborate the architecture and some key enabling technologies of WoT. Some pioneer open platforms and prototypes are also illustrated. The most recent research results are carefully summarized. Furthermore, many systematic comparisons are made to provide the insight in the evolution and future of WoT. Finally, we point out some open challenging issues that shall be faced and tackled by research community.

Zixue Cheng

2011-09-01

343

Framework for Automatic Web Service Composition.  

Science.gov (United States)

Complex mission plans need to incorporate information from various sources and domains to achieve a task. This information is available through a variety of web services in the Service-Oriented Architecture (SOA), but the ability to automatically compose ...

A. Kim, C. Meadows, E. Ioup, J. Sample, M. Kang

2009-01-01

344

Software architecture  

CERN Document Server

As a software architect you work in a wide-ranging and dynamic environment. You have to understand the needs of your customer, design architectures that satisfy both functional and non-functional requirements, and lead development teams in implementing the architecture. And it is an environment that is constantly changing: trends such as cloud computing, service orientation, and model-driven procedures open up new architectural possibilities. This book will help you to develop a holistic architectural awareness and knowledge base that extends beyond concrete methods, techniques, and technologi

Vogel, Oliver; Chughtai, Arif

2011-01-01

345

Sensor modules for wireless distributed sensor networks  

Energy Technology Data Exchange (ETDEWEB)

A national security need as well as environmental monitoring need exists for networks of sensors. The advantages of a network of sensors over a single sensor are improved range, sensitivity, directionality, and data readability. Depending upon the particular application, sensors can be acoustic, chemical, biological, thermal or inertial. A major desire in these sensor networks is to have the individual sensor and associated electronics small and low enough in power that the battery can also be small and of long life. Smaller, low power sensor nodes can allow more nodes per network. A typical network for security applications is depicted in Figure 1. Here a number of sensor nodes are deployed around a central hub node in a star configuration. In this scenario the hubs communicate with each other and ultimately relay information to a satellite. Future networks might follow this scenario or some other network architecture such as a hopping network where individual nodes communicate directly with each other. The focus of our research has been on development of the small low power nodes and less on the overall network topology. However, some consideration of the network must be given when designing the nodes and some consideration of the nodes must be given when designing the network. An individual sensor node contains not only the sensor but also the sensor interface electronics, analog to digital (A/D) converter, logic, RF communication link, antenna, and the battery. Future nodes will also contain some form of signal processing to allow more sophisticated network architectures. The FY98 goal for this project was to make a sensor node with a physical form factor of a 2 inch x 2 inch x 2 inch cube.

Lee, A P; McConaghy, C F; Simon, J N; Benett, W; Jones, L; Trevino, J

1999-02-22

346

HoCaMA: Home Care Hybrid Multiagent Architecture  

Science.gov (United States)

Home Care is one of the main objectives of Ambient Intelligence. Nowadays, the disabled and elderly population, which represents a significant part of our society, requires novel solutions for providing home care in an effective way. In this chapter, we present HoCaMA, a hybrid multiagent architecture that facilitates remote monitoring and care services for disabled patients at their homes. HoCaMA combines multiagent systems and Web services to facilitate the communication and integration with multiple health care systems. In addition, HoCaMA focuses on the design of reactive agents capable of interacting with different sensors present in the environment, and incorporates a system of alerts through SMS and MMS mobile technologies. Finally, it uses Radio Frequency IDentification and JavaCard technologies to provide advanced location and identification systems, as well as automatic access control facilities. HoCaMA has been implemented in a real environment and the results obtained are presented within this chapter.

Fraile, Juan A.; Bajo, Javier; Abraham, Ajith; Corchado, Juan M.

347

Creating Multiuser Web3D Applications Embedded in Web Pages  

Directory of Open Access Journals (Sweden)

Full Text Available It is not common to find web pages that show interactive multi-user 3D virtual environments as part of their contents without requiring special plug-ins for the web browser to be able to execute such an application. This paper presents a new architecture based on Java technology to create web portals which include 3D virtual scenarios that many users may share whose actions in that environment can incur in automatic updating of the rest of the portal's contents, without requiring any special additional software to be displayed by or installed unto any browser.

Xandre Chourio

2011-01-01

348

A versatile and interoperable network sensors for water resources monitoring  

Science.gov (United States)

Monitoring systems to assess water resources quantity and quality require extensive use of in-situ measurements, that have great limitations like difficulties to access and share data, and to customise and easy reconfigure sensors network to fulfil end-users needs during monitoring or crisis phases. In order to address such limitations Sensor Web Enablement technologies for sensors management have been developed and applied to different environmental context under the EU-funded OSIRIS project (Open architecture for Smart and Interoperable networks in Risk management based on In-situ Sensors, www.osiris-fp6.eu). The main objective of OSIRIS was to create a monitoring system to manage different environmental crisis situations, through an efficient data processing chain where in-situ sensors are connected via an intelligent and versatile network infrastructure (based on web technologies) that enables end-users to remotely access multi-domain sensors information. Among the project application, one was focused on underground fresh-water monitoring and management. With this aim a monitoring system to continuously and automatically check water quality and quantity has been designed and built in a pilot test, identified as a portion of the Amiata aquifer feeding the Santa Fiora springs (Grosseto, Italy). This aquifer present some characteristics that make it greatly vulnerable under some conditions. It is a volcanic aquifer with a fractured structure. The volcanic nature in Santa Fiora causes levels of arsenic concentrations that normally are very close to the threshold stated by law, but that sometimes overpass such threshold for reasons still not fully understood. The presence of fractures makes the infiltration rate very inhomogeneous from place to place and very high in correspondence of big fractures. In case of liquid-pollutant spills (typically hydrocarbons spills from tanker accidents or leakage from house tanks containing fuel for heating), these fractures can act as shortcuts to the heart of the aquifer, causing water contamination much faster than what inferable from average infiltration rates. A new system has been set up, upgrading a legacy sensor network with new sensors to address the monitoring and emergency phase management. Where necessary sensors have been modified in order to manage the whole sensor network through SWE services. The network manage sensors for water parameters (physical and chemical) and for atmospheric ones (for supporting the management of accidental crises). A main property of the developed architecture is that it can be easily reconfigured to pass from the monitoring to the alert phase, by changing sampling frequencies of interesting parameters, or deploying specific additional sensors on identified optimal positions (as in case of the hydrocarbon spill). A hydrogeological model, coupled through a hydrological interface to the atmospheric forcing, has been implemented for the area. Model products (accessed through the same web interface than sensors) give a fundamental added value to the upgraded sensors network (e.g. for data merging procedures). Together with the available measurements, it is shown how the model improves the knowledge of the local hydrogeological system, gives a fundamental support to eventually reconfigure the system (e.g. support on transportable sensors position). The network, basically conceived for real-time monitoring, allow to accumulate an unprecedent amount of information for the aquifer. The availability of such a large set of data (in terms of continuously measured water levels, fluxes, precipitation, concentrations, etc.) from the system, gives a unique opportunity for studying the influences of hydrogeological and geopedological parameters on arsenic and concentrations of other chemicals that are naturally present in water.

Ortolani, Alberto; Brandini, Carlo; Costantini, Roberto; Costanza, Letizia; Innocenti, Lucia; Sabatini, Francesco; Gozzini, Bernardo

2010-05-01

349

Semantic Web Semantic Web  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The semantic Web is a technology at the service of knowledge which is aimed at accessibility and the sharing of content; facilitating interoperability between different systems and as such is one of the nine key technological pillars of TIC (technologies for information and communication) within the third theme, programme specific cooperation of the seventh programme framework for research and development (7°PQRS, 2007-2013). As a system it seeks to overcome overload or excess of irrelevant ...

Anna Lamandini

2011-01-01

350

Customisable Scientific Web Portal for Fusion Research  

Energy Technology Data Exchange (ETDEWEB)

The Web browser has become one of the major application interfaces for remotely participating in magnetic fusion. Web portals are used to present very diverse sources of information in a unified way. While a web portal has several benefits over other software interfaces, such as providing single point of access for multiple computational services, and eliminating the need for client software installation, the design and development of a web portal has unique challenges. One of the challenges is that a web portal needs to be fast and interactive despite a high volume of tools and information that it presents. Another challenge is the visual output on the web portal often is overwhelming due to the high volume of data generated by complex scientific instruments and experiments; therefore the applications and information should be customizable depending on the needs of users. An appropriate software architecture and web technologies can meet these problems. A web-portal has been designed to support the experimental activities of DIII-D researchers worldwide. It utilizes a multi-tier software architecture, and web 2.0 technologies, such as AJAX, Django, and Memcached, to develop a highly interactive and customizable user interface. It offers a customizable interface with personalized page layouts and list of services for users to select. Customizable services are: real-time experiment status monitoring, diagnostic data access, interactive data visualization. The web-portal also supports interactive collaborations by providing collaborative logbook, shared visualization and online instant message services. Furthermore, the web portal will provide a mechanism to allow users to create their own applications on the web portal as well as bridging capabilities to external applications such as Twitter and other social networks. In this series of slides, we describe the software architecture of this scientific web portal and our experiences in utilizing web 2.0 technologies. A live demonstration of the system also is presented as well as user feedback from the 2009 DIII-D Experimental Campaign. (authors)

Abla, G.; Kim, E.; Schissel, D.; Flannagan, S. [General Atomics, San Diego (United States)

2009-07-01

351

Advanced Videoconferencing based on WebRTC  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Lately, videoconference applications have experienced an evolution towards the World Wide Web. New technologies have given browsers real-time communications capabilities. In this context, WebRTC aims to provide this functionality by following and defining standards. Being a new effort, WebRTC still lacks advanced videoconferencing services such as session recording, media mixing and adjusting to varying network conditions. This paper analyzes these challenges and proposes an architecture base...

Rodri?guez Pe?rez, Pedro; Cervin?o Arriba, Javier; Trajkovska, Irena; Salvachu?a Rodri?guez, Joaqui?n

2012-01-01

352

Working of Web Services using SOA  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Service Oriented Architecture is used to achieve loose coupling among diverse interacting software applications. SOA is used for reduction in development time and cost. Web services standards used for SOA are distributed software components that provide information to applications rather than to humans, through an application-oriented interface. SOA with web services standards provide greater interoperability. It also provides protection from lock-in to proprietary vendor software. Web servic...

Karande, Aarti M.; Chunekar, Vaibhav N.; Meshram, B. B.

2010-01-01

353

Business Intelligence from Web Usage Mining  

CERN Document Server

The rapid e-commerce growth has made both business community and customers face a new situation. Due to intense competition on one hand and the customer's option to choose from several alternatives business community has realized the necessity of intelligent marketing strategies and relationship management. Web usage mining attempts to discover useful knowledge from the secondary data obtained from the interactions of the users with the Web. Web usage mining has become very critical for effective Web site management, creating adaptive Web sites, business and support services, personalization, network traffic flow analysis and so on. In this paper, we present the important concepts of Web usage mining and its various practical applications. We further present a novel approach 'intelligent-miner' (i-Miner) to optimize the concurrent architecture of a fuzzy clustering algorithm (to discover web data clusters) and a fuzzy inference system to analyze the Web site visitor trends. A hybrid evolutionary fuzzy cluster...

Abraham, A

2004-01-01

354

Application of SOA (Service Oriented Architecture) in Early Warning Systems for Tsunamis and other Natural Hazards  

Science.gov (United States)

The DEWS (Distant Early Warning System) [1] project, funded under the 6th Framework Programme of the European Union, has the target to create a new generation of interoperable early warning systems. Two major objectives have steered the development process: usage of free and open source software (FOSS) and compliance to the principles of a Service Oriented Architecture (SOA). The second objective was mainly driven by the superior ambition of the development of a generic early warning framework not only for tsunamis but also for other natural hazards. The development of a reference architecture enforced the clear separation between hazard-specific and generic functionality. Integration of sensor networks was realized with Open Geospatial Consortium (OGC) [2] Sensor Web Enablement (SWE) [3] services. Sensor types are relatively specific for different hazard types: while inundation sensors can be used both for tsunami and floodwater hazards, contamination meters requires a complete different semantic integration into the client application. Based on sensor measurements a simulation system supports the operator with forecasts to enable the dissemination of precise warning messages. The simulation integration was realized with the Web Processing Service (WPS) [4] but here again semantic integration is simulation specific and has to be realized inside the client application. In contrast the integration of Spatial Data Infrastructure (SDI) via Web Mapping Service (WMS) [5] and Web Feature Service (WFS) [6] to complete the situation report is independent from any hazard type and depends on the data availability and requirements of each warning centre. The downstream component - the message dissemination from the operator via information logistics to the dissemination channel endpoints - has been realized independently from any specific hazard type. Using the Common Alerting Protocol (CAP) [7] and Emergency Data Exchange Language (EDXL) [8] enables the re-usage for all kind of emergency messages. Hazard-specific message types and their key-value-pairs like maximum inundation height for tsunamis have to be specified in a database that can be easily maintained via a graphical user interface. The used strategies are leveraged by the SOA principles and not only allow the (re-)usage of single system components - it also enables the replacement of components without modifications of others. [1] DEWS, www.dews-online.org [2] OGC, www.opengeospatial.org [3] SWE, www.opengeospatial.org/projects/groups/sensorweb [4] WPS, www.opengeospatial.org/standards/wps [5] WMS, www.opengeospatial.org/standards/wms [6] WFS, www.opengeospatial.org/standards/wfs [7] CAP, http://www.oasis-emergency.org/cap [8] EDXL, http://docs.oasis-open.org/emergency/edxl-de/v1.0/EDXL-DE_Spec_v1.0.pdf

Lendholt, Matthias; Hammitzsch, Martin; Wächter, Joachim

2010-05-01

355

Proposed Design and Implementation for RESTful Web Server  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper, we propose a framework to design and implement a novel RESTful Webserver architecture. The proposed RESTful Web server architecture is alightweight server that will be less taxing on system resources and willtherefore handle a greater volume of requests. Furthermore, in contrast to theusual servers that supports most websites, the proposed RESTful Web serverarchitecture is used for hosting RESTful-based Web Services. Moreover, the resultsobtained from our experiments show that the proposed architecture demonstrates highperformance while maintaining proper stability. Our Web server is programmed inJava using a simple yet flexible web application framework that fulfills theneeds of modern web application development. It also provides developers with arapid and cost-effective method for implementing, deploying and serving a webAPI (Application Programming Interface.

Mou'ath Hourani

2014-05-01

356

Web Usage Mining using Improved FP Tree Algorithm with Customized Web Log Preprocessing  

Directory of Open Access Journals (Sweden)

Full Text Available Web Usage Mining mines Web access logs for interesting pat-terns in WWW traffic. Web Usage Mining discovers interesting patterns in accesses to various Web pages within the Web space associated with a particular server. The Web Usage Mining architecture divides the process into two main parts- the first part includes preprocessing, transaction identification, and data integration components. The second part includes the largely domain independent application of generic data mining and pattern matching. Input to the Web usage Mining process is Web Server Logs, Error logs, User Cookies and Client Cache Records. This paper contains an efficient improved iterative FP Tree algorithm for generating frequent access patterns from the access paths of the users. The frequent access patterns are gen-erated by backward tree traversals. This operation will take less time compare to the existing algorithms. Paper also composed of customized web log preprocessing for mined in different applications.

Prateek Gupta

2011-02-01

357

Architecture Week  

Science.gov (United States)

Based in Eugene, Oregon, Architecture Week is a magazine that is intended for design and building professionals, and their work includes profiles of new building techniques, historic preservation issues, and architectural practice. Visitors can view the current issues online here, and they will also want to look through their "And More" area. Here they will find sections like "Blog Center", "New Products", "Jobs" and "Conferences". Also, visitors can subscribe to their "ArchitectureWeek Notes", which is a weekly email newsletter. Recent articles on the site have included a piece on historic sites in the United States that are at risk of being demolished and another piece on the importance of listening to clients before starting a major architectural project.

358

Web Engineering.  

Science.gov (United States)

Web Engineering is the application of systematic, disciplined and quantifiable approaches to development, operation, and maintenance of Web-based applications. It is both a pro-active approach and a growing collection of theoretical and empirical research...

Y. Deshpande, S. Murugeesan, A. Ginige, S. Hansen, D. Schwabe, M. M. Gaedke, B. White

2003-01-01

359

Cooperative Mobile Web Browsing  

Directory of Open Access Journals (Sweden)

Full Text Available This paper advocates a novel approach for mobile web browsing based on cooperation among wireless devices within close proximity operating in a cellular environment. In the actual state of the art, mobile phones can access the web using different cellular technologies. However, the supported data rates are not sufficient to cope with the ever increasing traffic requirements resulting from advanced and rich content services. Extending the state of the art, higher data rates can only be achieved by increasing complexity, cost, and energy consumption of mobile phones. In contrast to the linear extension of current technology, we propose a novel architecture where mobile phones are grouped together in clusters, using a short-range communication such as Bluetooth, sharing, and accumulating their cellular capacity. The accumulated data rate resulting from collaborative interactions over short-range links can then be used for cooperative mobile web browsing. By implementing the cooperative web browsing on commercial mobile phones, it will be shown that better performance is achieved in terms of increased data rate and therefore reduced access times, resulting in a significantly enhanced web browsing user experience on mobile phones.

G. P. Perrucci

2009-01-01

360

IAIMS Architecture  

Digital Repository Infrastructure Vision for European Research (DRIVER)

An information system architecture defines the components of a system and the interfaces among the components. A good architecture is essential for creating an Integrated Advanced Information Management System (IAIMS) that works as an integrated whole yet is flexible enough to accommodate many users and roles, multiple applications, changing vendors, evolving user needs, and advancing technology. Modularity and layering promote flexibility by reducing the complexity of...

Hripcsak, George

1997-01-01

 
 
 
 
361

Food Webs  

Science.gov (United States)

The representation depicts 4 different food webs: Antarctica, the African Grasslands, the Australia Grasslands and a Marine environment. A separate food web for scavengers and decomposers is present in the African Grasslands section. Viewers must first build the web by moving boxes with the organism's picture and name to the appropriate spot on a grid. Clues describing food requirements are given as the boxes are moved. When the boxes are correctly placed a complete food web (with arrows) is displayed.

362

Silicon web process development  

Science.gov (United States)

A barrier crucible design which consistently maintains melt stability over long periods of time was successfully tested and used in long growth runs. The pellet feeder for melt replenishment was operated continuously for growth runs of up to 17 hours. The liquid level sensor comprising a laser/sensor system was operated, performed well, and meets the requirements for maintaining liquid level height during growth and melt replenishment. An automated feedback loop connecting the feed mechanism and the liquid level sensing system was designed and constructed and operated successfully for 3.5 hours demonstrating the feasibility of semi-automated dendritic web growth. The sensitivity of the cost of sheet, to variations in capital equipment cost and recycling dendrites was calculated and it was shown that these factors have relatively little impact on sheet cost. Dendrites from web which had gone all the way through the solar cell fabrication process, when melted and grown into web, produce crystals which show no degradation in cell efficiency. Material quality remains high and cells made from web grown at the start, during, and the end of a run from a replenished melt show comparable efficiencies.

Duncan, C. S.; Seidensticker, R. G.; McHugh, J. P.; Hill, F. E.; Skutch, M. E.; Driggers, J. M.; Hopkins, R. H.

1980-06-01

363

A Web-Based Integration Procedure for the Development of Reconfigurable Robotic Work-Cells  

Directory of Open Access Journals (Sweden)

Full Text Available Concepts related to the development of reconfigurable manufacturing systems (RMS and methodologies to provide the best practices in the processing industry and factory automation, such as system integration and web?based technology, are major issues in designing next?generation manufacturing systems (NGMS. Adaptable and integrable devices are crucial for the success of NGMS. In robotic cells the integration of manufacturing components is essential to accelerate system adaptability. Sensors, control architectures and communication technologies have contributed to achieving further agility in reconfigurable factories. In this work a web?based robotic cell integration procedure is proposed to aid the identification of reconfigurable issues and requirements. This methodology is applied to an industrial robot manipulator to enhance system flexibility towards the development of a reconfigurable robotic platform.

Paulo Ferreira

2013-07-01

364

Samuelson's Webs  

CERN Document Server

In the present paper we define Samuelson's webs and their rank. The main result of the paper is the proof that the rank of the Samuelson webs does not exceed 6, as well as finding the conditions under which this rank is maximal for the general Samuelson webs as well as for their singular cases.

Goldberg, Vladislav V

2009-01-01

365

Generic Web Services: A Step Towards Green Computing  

Directory of Open Access Journals (Sweden)

Full Text Available Software as a Service (SaaS is a buzzword especially in the realm of Cloud Computing. We can reduce the number of applications deployed on the data-centers by using similar applications hosted by the SaaS providers. Thus, “reusability” of a SaaS is a key-point of focus promoting the same code-base of an application serving multiple clients. This reduces the need for more storage space and computational power in the data-centers thus aligning the SaaS architecture to a “greener” computing paradigm. In this paper, we provide a prototype implementation framework, which uses the same web service to Register and Report the results of a backend Network Monitoring (NM as well as Weather Monitoring application. We have designed and developed this “Generic Web Services Framework” as well as both the backend applications. The NM application is done using both Mobile Agents and SNMP and the WM application is implemented using Temperature Sensors. This paper aims to give a prototype implementation as proof of SaaS maturity levels of a generic / reusable web service thus orienting towards green computing.

Mydhili K Nair

2009-11-01

366

Model-driven methodology for rapid deployment of smart spaces based on resource-oriented architectures.  

Science.gov (United States)

Advances in electronics nowadays facilitate the design of smart spaces based on physical mash-ups of sensor and actuator devices. At the same time, software paradigms such as Internet of Things (IoT) and Web of Things (WoT) are motivating the creation of technology to support the development and deployment of web-enabled embedded sensor and actuator devices with two major objectives: (i) to integrate sensing and actuating functionalities into everyday objects, and (ii) to easily allow a diversity of devices to plug into the Internet. Currently, developers who are applying this Internet-oriented approach need to have solid understanding about specific platforms and web technologies. In order to alleviate this development process, this research proposes a Resource-Oriented and Ontology-Driven Development (ROOD) methodology based on the Model Driven Architecture (MDA). This methodology aims at enabling the development of smart spaces through a set of modeling tools and semantic technologies that support the definition of the smart space and the automatic generation of code at hardware level. ROOD feasibility is demonstrated by building an adaptive health monitoring service for a Smart Gym. PMID:23012544

Corredor, Iván; Bernardos, Ana M; Iglesias, Josué; Casar, José R

2012-01-01

367

Model-Driven Methodology for Rapid Deployment of Smart Spaces Based on Resource-Oriented Architectures  

Directory of Open Access Journals (Sweden)

Full Text Available Advances in electronics nowadays facilitate the design of smart spaces based on physical mash-ups of sensor and actuator devices. At the same time, software paradigms such as Internet of Things (IoT and Web of Things (WoT are motivating the creation of technology to support the development and deployment of web-enabled embedded sensor and actuator devices with two major objectives: (i to integrate sensing and actuating functionalities into everyday objects, and (ii to easily allow a diversity of devices to plug into the Internet. Currently, developers who are applying this Internet-oriented approach need to have solid understanding about specific platforms and web technologies. In order to alleviate this development process, this research proposes a Resource-Oriented and Ontology-Driven Development (ROOD methodology based on the Model Driven Architecture (MDA. This methodology aims at enabling the development of smart spaces through a set of modeling tools and semantic technologies that support the definition of the smart space and the automatic generation of code at hardware level. ROOD feasibility is demonstrated by building an adaptive health monitoring service for a Smart Gym.

José R. Casar

2012-07-01

368

Energy Consumption Control of an Air Conditioner Using Web Services  

Directory of Open Access Journals (Sweden)

Full Text Available Air-conditioning (AC systems have the highest power consumption among the appliances and consumer devices used at residential homes and buildings. Reducing their energy use will lower peak time usage and lower CO2 emissions. Recently, employment of the Information and Communications Technologies (ICT to the power grid has smartened the grid. In the smart grid new opportunities emerge for AC energy consumption control. The aim of this paper is to reduce the air conditioning energy consumption of residential customers. It proposes an architecture that provides easy management and control using sensor network web services. A simulation thermal model of a house considers house data and outside temperature is presented. Simulation results showed a proposed temperature control method can have significant energy saving while maintaining customer comfort.

Asaad Elmoudi

2011-08-01

369

Applying Web-Based Tools for Research, Engineering, and Operations  

Science.gov (United States)

Personnel in the NASA Glenn Research Center Network and Architectures branch have performed a variety of research related to space-based sensor webs, network centric operations, security and delay tolerant networking (DTN). Quality documentation and communications, real-time monitoring and information dissemination are critical in order to perform quality research while maintaining low cost and utilizing multiple remote systems. This has been accomplished using a variety of Internet technologies often operating simultaneously. This paper describes important features of various technologies and provides a number of real-world examples of how combining Internet technologies can enable a virtual team to act efficiently as one unit to perform advanced research in operational systems. Finally, real and potential abuses of power and manipulation of information and information access is addressed.