WorldWideScience

Sample records for technology called radio

  1. 46 CFR 169.750 - Radio call sign.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Radio call sign. 169.750 Section 169.750 Shipping COAST... Control, Miscellaneous Systems, and Equipment Markings § 169.750 Radio call sign. Each vessel certificated for exposed or partially protected water service must have its radio call sign permanently...

  2. Chautauqua notebook: appropriate technology on radio

    Energy Technology Data Exchange (ETDEWEB)

    Renz, B.

    1981-01-01

    Experiences in establishing and maintaining a regional call-in information-exchange radio show (Chautauqua) on energy conservation, appropriate technology, renewable energy sources, and self-reliance are discussed. Information is presented on: appropriate technology; the Chautauquaa concept; topics discussed; research performed; guests; interviewing tips; types of listeners; program features; where to find help; promotion and publicity; the technical and engineering aspects; the budget and funding; and station policies. (MCW)

  3. SITE TECHNOLOGY CAPSULE: IITRI RADIO FREQUENCY HEATING TECHNOLOGY

    Science.gov (United States)

    Radio frequency heating (RFH) technologies use electromagnetic energy in the radio frequency (RF) band to heat soil in situ, thereby potentially enhancing the performance of standard soil vapor extraction (SVE) technologies. Contaminants are removed from in situ soils and transfe...

  4. 47 CFR 90.241 - Radio call box operations.

    Science.gov (United States)

    2010-10-01

    ... remains on for a period in excess of three minutes. The automatic cutoff system must be designed so the... Safety Pool for highway call box systems subject to the following requirements: (1) Call box transmitters... effective radiated power (ERP). (3) The height of a call box antenna may not exceed 6.1 meters (20...

  5. Technology, Empowerment and Community Radio

    OpenAIRE

    Scifo, Salvatore

    2015-01-01

    This article will provide an overview of the conceptual contours of community media and community radio, highlighting some of the key questions shaping the debate and, with the help of a case study, show how digital media in the context of community radio can help local groups to get a voice in their local media systems, and how a university-based radio station, and its students and volunteers, play an important role for a more diverse and vibrant media content available in their area.

  6. Dual technology: making incompatible radio interface standards coexist

    Science.gov (United States)

    Fiore, Dennis J.

    1996-01-01

    Existing cellular networks handle voice traffic by using narrowband, single-technology equipment. More recently-developed radio interface standards such as TDMA and CDMA use different technology and equipment and are incompatible with the existing cellular infrastructure. The needs of wireless customers are also changing dramatically. Typical users will soon expect to be able to transmit data as well as voice. In the immediate future, users will demand advanced features such as one phone number, called ID, location ID, all of which require new technology and radio standards. To meet the need for transporting data, cellular network providers are adding equipment to transport data over existing cellular networks via CDPD. With the advent of dual technology, network providers will be able to satisfy customers' needs and increase their revenue--without installing additional data equipment. Dual technology will provide simultaneous support for incompatible standards and also supply a migration path to the advanced features of future digital phones.

  7. Special radio call signal, HW6SPS, used on the SPS Inauguration Day

    CERN Document Server

    Sagnell, Bengt

    1977-01-01

    CERN had been given a special French call sign for the occasion - HW6SPS - which was used over the weekend to contact a large number of amateur stations in Europe and world-wide to spread the happy message. The stations were manned by ~10 licensed amateur radio operators in SPS.

  8. Telemetry Modernization with Open Architecture Software-Defined Radio Technology

    Science.gov (United States)

    2016-01-01

    As the market demand for use of the existing Telemetry Modernization with Open Architecture Software-Defined Radio Technology Lincoln Laboratory...is conducting a software-defined radio technology development program to improve the way telemetered information is collected and processed...architecture software-defined radio technology . Approved for public release; distribution unlimited (SMDC-5102 26OCT2015). This material is based

  9. Biomedical Monitoring By A Novel Noncontact Radio Frequency Technology Project

    Science.gov (United States)

    Oliva-Buisson, Yvette J. (Compiler)

    2014-01-01

    The area of Space Health and Medicine is one of the NASA's Space Technology Grand Challenges. Space is an extreme environment which is not conducive to human life. The extraterrestrial environment can result in the deconditioning of various human physiological systems and thus require easy to use physiological monitoring technologies in order to better monitor space crews for appropriate health management and successful space missions and space operations. Furthermore, the Space Technology Roadmap's Technology Area Breakdown Structure calls for improvements in research to support human health and performance (Technology Area 06). To address these needs, this project investigated a potential noncontact and noninvasive radio frequency-based technique of monitoring central hemodynamic function in human research subjects in response to orthostatic stress.

  10. Advanced radio over fiber network technologies.

    Science.gov (United States)

    Novak, Dalma; Waterhouse, Rod

    2013-09-23

    The evolution of wireless communication networks supporting emerging broadband services and applications offers new opportunities for realizing integrated optical and wireless network infrastructures. We report on some of our recent activities investigating advanced technologies for next generation converged optical wireless networks. Developments in Active Antenna Systems, mobile fronthaul architectures, and 60 GHz fiber distributed wireless networks are described. We also discuss the potential for analog radio over fiber distribution links as a viable solution for meeting the capacity requirements of new network architectures.

  11. INNOVATIVE TECHNOLOGY EVALUATION REPORT: RADIO FREQUENCY HEATING, KAI TECHNOLOGIES, INC.

    Science.gov (United States)

    A demonstration of KAI Technologies in-situ radio frequency heating system for soil treatment was conducted from January 1994 to July 1994 at Kelly Air Force Base in San Antonio, Texas. This demonstration was conducted as a joint effort between the USEPA and the USAF. The technol...

  12. Exploring Radio Pulsars With New Technologies

    Science.gov (United States)

    Torne, Pablo

    2017-04-01

    Pulsars are rapidly-rotating, highly-magnetized compact neutron stars. Their strong gravitational and magnetic fields, together with the stability of their rotations and the precision with which we can measure them using radio telescopes, make pulsars unique laboratories for a wide variety of physical experiments. This thesis presents an investigation of the application of new receiver technologies and observing techniques at different radio wavelengths to the search for and study of pulsars. Discovering new pulsars always expands our capabilities to do new science. In general, the most exciting pulsars are those in binary systems because of their potential in high-precision tests of General Relativity and other gravity theories, and for constraining the Equation-of-State of ultra-dense matter. I present a search for pulsars in the Galactic Centre, where the probabilities of finding pulsar binaries, including the long-sought pulsar-black hole system, are high. The data were taken with the Effelsberg 100-m radio telescope and used high radio frequencies between 4.85 and 18.95 GHz to partially overcome the strong scattering in the direction to the centre of the Galaxy. With approximately 50 per cent of the results reviewed, no new pulsars have been discovered. We carried out a study of the sensitivity limits of the survey, finding that our sensitivity to Galactic Centre pulsars is highly reduced by the contributions to the total system noise of the Galactic Centre background and the atmosphere. We conclude that the paucity of detections in this and perhaps also previous similar surveys is likely due to insufficient sensitivity, and not a lack of pulsars in the region. In March 2013, a radio magnetar, one of the rarest types of pulsars, became suddenly visible from the Galactic Centre. I led two multifrequency observing campaigns on this source, SGR J1745-2900, in order to study its radio emission properties. Four different observatories were involved (including

  13. JPL Big Data Technologies for Radio Astronomy

    Science.gov (United States)

    Jones, Dayton L.; D'Addario, L. R.; De Jong, E. M.; Mattmann, C. A.; Rebbapragada, U. D.; Thompson, D. R.; Wagstaff, K.

    2014-04-01

    During the past three years the Jet Propulsion Laboratory has been working on several technologies to deal with big data challenges facing next-generation radio arrays, among other applications. This program has focused on the following four areas: 1) We are investigating high-level ASIC architectures that reduce power consumption for cross-correlation of data from large interferometer arrays by one to two orders of magnitude. The cost of operations for the Square Kilometre Array (SKA), which may be dominated by the cost of power for data processing, is a serious concern. A large improvement in correlator power efficiency could have a major positive impact. 2) Data-adaptive algorithms (machine learning) for real-time detection and classification of fast transient signals in high volume data streams are being developed and demonstrated. Studies of the dynamic universe, particularly searches for fast (system for eventual deployment on ASKAP. In addition, a real-time transient detection experiment is now running continuously and commensally on NRAO's Very Long Baseline Array. 3) Scalable frameworks for data archiving, mining, and distribution are being applied to radio astronomy. A set of powerful open-source Object Oriented Data Technology (OODT) tools is now available through Apache. OODT was developed at JPL for Earth science data archives, but it is proving to be useful for radio astronomy, planetary science, health care, Earth climate, and other large-scale archives. 4) We are creating automated, event-driven data visualization tools that can be used to extract information from a wide range of complex data sets. Visualization of complex data can be improved through algorithms that detect events or features of interest and autonomously generate images or video to display those features. This work has been carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

  14. 75 FR 10439 - Cognitive Radio Technologies and Software Defined Radios

    Science.gov (United States)

    2010-03-08

    ... clarification filed by Cisco Systems, Inc. (``Cisco'') requesting that the Commission clarify: (1) The... of software that controls security measures in software defined radios. 3. In responding to the Cisco... response to the Cisco petition for reconsideration that raised the issue of using open source software...

  15. DEMONSTRATION BULLETIN: RADIO FREQUENCY HEATING - KAI TECHNOLOGIES, INC.

    Science.gov (United States)

    Radio frequency heating (RFH) is a process that uses electromagnetic energy in the radio frequency (RF) band to heat soil in situ, thereby potentially enhancing the performance of standard soil vapor extraction (SVE) technologies. An RFH system developed by KAI Technologies, I...

  16. Musharraf calls for North-South cooperation: Science and technology

    CERN Multimedia

    2006-01-01

    "President Gen Pervez Musharraf has called for improved North-South cooperation in scinece and technology and said it would enable millions of people in the developing countries to realize the goal of rapid socio-economic progress" (1.5 page)

  17. Will Rogers's Radio: Race and Technology in the Cherokee Nation

    Science.gov (United States)

    Ware, Amy M.

    2009-01-01

    While radio personality Will Rogers's pioneering role in radio is obvious (he worked in the medium during its earliest years), its connections to Cherokee and other tribal technologies have been neglected. This failure to recognize Rogers's part in this particular strain of Cherokee history is a symptom of a larger cultural illness in the United…

  18. A Study on Radio Access Technology Selection Algorithms

    CERN Document Server

    Wu, Leijia

    2012-01-01

    This book discusses the basic idea of Common Radio Resource Management (CRRM), especially on the Radio Access Technologies selection part of CRRM. It introduces two interaction functions (information reporting function and RRM decision support function) and four interaction degrees (from low to very high) of CRRM. Four possible CRRM topologies (CRRM server, integrated CRRM, Hierarchical CRRM, and CRRM in user terminals) are described. The book presents different Radio Access Technologies selection algorithms, including single criterion and multiple criteria based algorithms are presented and compares them. Finally, the book analyses the advantages and disadvantages of the different selection algorithms.

  19. How can radio frequency identification technology impact nursing practice?

    Science.gov (United States)

    Billingsley, Luanne; Wyld, David

    2014-12-01

    Radio frequency identification (RFID) technology can save nurses time, improve quality of care, en hance patient and staff safety, and decrease costs. However, without a better understanding of these systems and their benefits to patients and hospitals, nurses may be slower to recommend, implement, or adopt RFID technology into practice.

  20. A call for safer utilization of radio frequency identification in the e-health era.

    Science.gov (United States)

    Liu, Chung-Feng; Hwang, Hsin-Ginn; Kuo, Kuang-Ming; Hung, Won-Fu

    2011-10-01

    The main purpose of this study was to investigate the perceptions of the electromagnetic interference (EMI) caused by radio frequency identification (RFID) with medical devices among hospitals as well as to call the attention of medical institutions to the development of RFID applications. A survey sponsored by the Department of Health of Taiwan was conducted and the target subjects were every hospital in Taiwan (486 in total). The survey topics included testing of RFID interference with medical devices and perceptions of safety issues of RFID. The main targets of the survey were the Chief Information Officers (CIOs) or the main person responsible for RFID systems in each hospital. Of the original 486 questionnaires mailed, 273 were returned. A return rate of 56.17% was obtained. The survey results revealed that only six hospitals had carried out tests on interference by RFID with medical devices, and the results of these tests indicated that RFID does not interfere with medical devices. A majority of hospitals understood that RFID may interfere with medical devices but did not think that this would seriously harm patients. The application of RFID in the healthcare industry is certainly promising; however, EMI issues must be appropriately handled. This study asserts that most hospitals do not understand or pay insufficient attention to the issue of RFID interference with patient safety or medical devices. In addition, most hospitals believe that the problem of RFID should be resolved by RFID vendors. Therefore, this study argues that medical institutions should develop more understanding of RFID issues and that more attention should be given to the potential problems of RFID interference when developing RFID applications.

  1. MUSICAL RADIO: THE TECHNOLOGY OF PROGRAMING

    Directory of Open Access Journals (Sweden)

    Bysko Maxim

    2016-12-01

    Full Text Available The author considers the musical radio broadcasting of the XX-XXI centuries from the point of view of a technical progress. He covers the period from "before tape" era and "tape" era to the modern digital media broadcasting (as example with the Digispot II broadcast automation software. However, despite the significant changes in technics, which are expressed primarily in the extensive use of a computer automation and reduction of programming staff (often up to two or three persons: a program director, a managing editor, a music editor, the principles of the linear broadcasting structure remained identical as a whole. So, the basic structural units here are the program blocks, "clocks", blocks of clock's elements (today, these elements often filled with automated rotation.

  2. Information technology - Telecommunications and information exchange between systems - Private integrated services network - Specification, functional model and information flows - Call priority interruption and call priority interruption protection supplementary services

    CERN Document Server

    International Organization for Standardization. Geneva

    2003-01-01

    Information technology - Telecommunications and information exchange between systems - Private integrated services network - Specification, functional model and information flows - Call priority interruption and call priority interruption protection supplementary services

  3. Information technology - Telecommunications and information exchange between systems - Private integrated services network - Inter-exchange signalling protocol - Call priority interruption and call priority interruption protection supplementary services

    CERN Document Server

    International Organization for Standardization. Geneva

    2003-01-01

    Information technology - Telecommunications and information exchange between systems - Private integrated services network - Inter-exchange signalling protocol - Call priority interruption and call priority interruption protection supplementary services

  4. RFID explained a primer on radio frequency identification technologies

    CERN Document Server

    Want, Roy

    2006-01-01

    This lecture provides an introduction to Radio Frequency Identification (RFID), a technology enabling automatic identification of objects at a distance without requiring line-of-sight. Electronic tagging can be divided into technologies that have a power source (active tags), and those that are powered by the tag interrogation signal (passive tags); the focus here is on passive tags. An overview of the principles of the technology divides passive tags into devices that use either near field or far field coupling to communicate with a tag reader. The strengths and weaknesses of the approaches a

  5. Superconducting Radio Frequency Technology: An Overview

    Energy Technology Data Exchange (ETDEWEB)

    Peter Kneisel

    2003-06-01

    Superconducting RF cavities are becoming more often the choice for larger scale particle accelerator projects such as linear colliders, energy recovery linacs, free electron lasers or storage rings. Among the many advantages compared to normal conducting copper structures, the superconducting devices dissipate less rf power, permit higher accelerating gradients in CW operation and provide better quality particle beams. In most cases these accelerating cavities are fabricated from high purity bulk niobium, which has superior superconducting properties such as critical temperature and critical magnetic field when compared to other superconducting materials. Research during the last decade has shown, that the metallurgical properties--purity, grain structure, mechanical properties and oxidation behavior--have significant influence on the performance of these accelerating devices. This contribution attempts to give a short overview of the superconducting RF technology with emphasis on the importance of the material properties of the high purity niobium.

  6. CALL Teacher Education as an Impetus for L2 Teachers in Integrating Technology

    Science.gov (United States)

    Hong, Kwang Hee

    2010-01-01

    The ultimate goal of CALL teacher education is to enable L2 teachers to integrate CALL technology into their classroom with confidence and knowledge. As a way to achieve this goal, an increasing number of studies have paid attention to the integration of CALL technology into the teacher education program and into the classroom. Nonetheless, there…

  7. INTEGRATING RADIO FREQUENCY IDENTIFICATION TECHNOLOGY IN ACADEMIC MANAGEMENT SYSTEM

    Directory of Open Access Journals (Sweden)

    Zainab Rasheed Mirza

    2014-01-01

    Full Text Available The purpose of this study is building a web and windows based intelligent system using web technologies, biometric and Radio Frequency Identification technologies (RFID to strengthen an Academic Management System (AMS in a campus for monitoring and improving academic performance of teachers and students. A campus mobile phone application will allow guardians to monitor student’s movement history at campus, e-payments and food choices at canteen, class attendance, exam attendance and academic performance on daily basis. Mobile application for students will allow students to view their class schedules, teacher appointments, e-payment statement, warnings or announcements, locate their exam halls and search for classrooms.

  8. FUZZY-LOGIC BASED CALL ADMISSION CONTROL FOR A HETEROGENEOUS RADIO ENVIRONMENT

    DEFF Research Database (Denmark)

    Ramkumar, Venkata; Mihovska, Albena D.; Prasad, Neeli R.;

    Dette dokument foreslår et nyt opkald Admission Control (CAC) algoritme, der finder forskellige typer af applikationer med forskellige QoS parametre, som en bruger og giver de nødvendige QoS til nyankomne brugere uden en forringelse af de QoS at der allerede er optaget dem. Den foreslåede CAC er...... evalueret for en heterogen radio access-teknologier (rotter) scenario. Den QoS parametre varierer afhængigt af den type af ansøgninger, og aftalen mellem udbyderen og brugeren. Den foreslåede CAC er baseret på en fuzzy logik mekanisme, der består af to etaper, i første omgang den bedste celle i hver RAT er...

  9. New AIDA-2020 call for breakthrough detector technologies

    CERN Multimedia

    2016-01-01

    Physicists, engineers, and industry will be interested in a new proof-of-concept fund for breakthrough projects from the general field of detector development and testing.   Launched in the framework of the European project AIDA-2020, this open call will provide up to 200k€ of seed funding to support innovative and societal applications with a focus on industry-oriented applications. The deadline for applying is 20 October 2016. More information here.

  10. Experts call for increasing support to superconducting technology studies

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ The Chinese government should launch a major research project on superconducting technology, as it is of significant importance for ensuring national energy security, raising energy efficiency and reducing emissions, urged experts at a workshop held at the CAS Institute of Electronic Engineering on 6 and 7 March in Beijing.

  11. Amateur Radio Communication Technology Contingency Communication in Emergency Situation

    Directory of Open Access Journals (Sweden)

    Johar Azlee

    2017-01-01

    Full Text Available Disasters cannot be avoided, but efforts can be made to reduce death, injuries and property damages through better communications and better planning to deal with it before it happen. Thus we need to adopt available technology, like the Amateur Radio Communication Technology (ACT, to face this problem. These include providing awareness, training and support for the communities who adopt the technology for Emergency Communication (EC. Through having more qualified Amateur Radio Communities (ARC in the adoption of the ARCT, we would be able to improve the communication before, during and after the disasters struck. There are many challenges and issues in the adoption of the ARCT that would part of this study. This article also describes several case studies of communication failure during Hurricane Katrina (2005 in the USA, as well as disasters in several other countries and Malaysia. The tragedies led to failure of existing communication infrastructure, and were reprieved by the help of the voluntary ARC to support the relief agencies in the evacuation and assistance the disaster victims. Therefore, this article will highlight the significant issues that influence the adoption of ARCT in EC.

  12. Linearization Technologies for Broadband Radio-Over-Fiber Transmission Systems

    Directory of Open Access Journals (Sweden)

    Xiupu Zhang

    2014-11-01

    Full Text Available Linearization technologies that can be used for linearizing RoF transmission are reviewed. Three main linearization methods, i.e. electrical analog linearization, optical linearization, and electrical digital linearization are presented and compared. Analog linearization can be achieved using analog predistortion circuits, and can be used for suppression of odd order nonlinear distortion components, such as third and fifth order. Optical linearization includes mixed-polarization, dual-wavelength, optical channelization and the others, implemented in optical domain, to suppress both even and odd order nonlinear distortion components, such as second and third order. Digital predistortion has been a widely used linearization method for RF power amplifiers. However, digital linearization that requires analog to digital converter is severely limited to hundreds of MHz bandwidth. Instead, analog and optical linearization provide broadband linearization with up to tens of GHz. Therefore, for broadband radio over fiber transmission that can be used for future broadband cloud radio access networks, analog and optical linearization are more appropriate than digital linearization. Generally speaking, both analog and optical linearization are able to improve spur-free dynamic range greater than 10 dB over tens of GHz. In order for current digital linearization to be used for broadband radio over fiber transmission, the reduced linearization complexity and increased linearization bandwidth are required. Moreover, some digital linearization methods in which the complexity can be reduced, such as Hammerstein type, may be more promising and require further investigation.

  13. SITE TECHNOLOGY CAPSULE: KAI RADIO FREQUENCY HEATING TECHNOLOGY

    Science.gov (United States)

    KAI developed a patented, in situ RFH technology to enhance the removal of volatile and semi-volatile organics by soil vapor extraction (SVE). Electromagnetic energy heats the soil resulting in increased contaminant vapor pressures and soil permeability that may increase with dry...

  14. IITRI RADIO FREQUENCY HEATING TECHNOLOGY - INNOVATIVE TECHNOLOGY EVALUATION REPORT

    Science.gov (United States)

    IITRI's patented in situ RFH technology enhances the removal of volatile and semi-volatile organics by soil vapor extraction (SVE). Electromagnetic energy heats the soil resulting in increased contaminant vapor pressures and potentially higher soil permeability. RFH heats soil us...

  15. IITRI RADIO FREQUENCY HEATING TECHNOLOGY - INNOVATIVE TECHNOLOGY EVALUATION REPORT

    Science.gov (United States)

    IITRI's patented in situ RFH technology enhances the removal of volatile and semi-volatile organics by soil vapor extraction (SVE). Electromagnetic energy heats the soil resulting in increased contaminant vapor pressures and potentially higher soil permeability. RFH heats soil us...

  16. Farmer participation in radio campaigns for technology adoption:

    African Journals Online (AJOL)

    Peter Berglez

    Key words: radio campaign, participation, radio production, adoption, ... from the AFRRI hybrid maize campaign in Mangochi, Malawi, Journal of ... communication action research project whose goal was to investigate how radio and modern.

  17. Technology or Process First? A Call for Mediation Between ESM and BPM Approaches in Organizations

    DEFF Research Database (Denmark)

    Siurdyban, Artur; Svejvig, Per; Møller, Charles

    2011-01-01

    between them using strategic alignment, Enterprise Systems and Business Process Management theories. We argue that the insights from these cases can lead to a better alignment between process and technology. Implications for practice include the direction towards a closer integration of process...... and technology factors in organizations. Theoretical implications call for a design-oriented view of technology and process alignment....

  18. 78 FR 78838 - National Medal of Technology and Innovation Call for 2014 Nominations

    Science.gov (United States)

    2013-12-27

    ... United States Patent and Trademark Office National Medal of Technology and Innovation Call for 2014... nominations for the National Medal of Technology and Innovation (NMTI). Since establishment by Congress in the Stevenson-Wydler Technology Innovation Act of 1980, the President of the United States has awarded...

  19. 77 FR 2047 - National Medal of Technology and Innovation Call for 2012 Nominations

    Science.gov (United States)

    2012-01-13

    ... United States Patent and Trademark Office National Medal of Technology and Innovation Call for 2012... nominations for the National Medal of Technology and Innovation (NMTI). Since establishment by Congress in the Stevenson-Wydler Technology Innovation Act of 1980, the President of the United States has awarded...

  20. 75 FR 82378 - National Medal of Technology and Innovation Call for 2011 Nominations

    Science.gov (United States)

    2010-12-30

    ... United States Patent and Trademark Office National Medal of Technology and Innovation Call for 2011... nominations for the National Medal of Technology and Innovation (NMTI). Since establishment by Congress in the Stevenson-Wydler Technology Innovation Act of 1980, the President of the United States has awarded...

  1. 78 FR 90 - National Medal of Technology and Innovation Call for 2013 Nominations

    Science.gov (United States)

    2013-01-02

    ... United States Patent and Trademark Office National Medal of Technology and Innovation Call for 2013...) is accepting nominations for the National Medal of Technology and Innovation (NMTI). Since establishment by Congress in the Stevenson-Wydler Technology Innovation Act of 1980, the President of the...

  2. 75 FR 3203 - National Medal of Technology and Innovation Call for 2010 Nominations

    Science.gov (United States)

    2010-01-20

    ... United States Patent and Trademark Office National Medal of Technology and Innovation Call for 2010... nominations for its National Medal of Technology and Innovation (NMTI). Since establishment by Congress in 1980, the President of the United States has awarded the National Medal of Technology and...

  3. Radio Frequency Identification (RFID) technology and patient safety.

    Science.gov (United States)

    Ajami, Sima; Rajabzadeh, Ahmad

    2013-09-01

    Radio frequency identification (RFID) systems have been successfully applied in areas of manufacturing, supply chain, agriculture, transportation, healthcare, and services to name a few. However, the different advantages and disadvantages expressed in various studies of the challenges facing the technology of the use of the RFID technology have been met with skepticism by managers of healthcare organizations. The aim of this study was to express and display the role of RFID technology in improving patient safety and increasing the impact of it in healthcare. This study was non-systematical review, which the literature search was conducted with the help of libraries, books, conference proceedings, PubMed databases and also search engines available at Google, Google scholar in which published between 2004 and 2013 during Febuary 2013. We employed the following keywords and their combinations; RFID, healthcare, patient safety, medical errors, and medication errors in the searching areas of title, keywords, abstract, and full text. The preliminary search resulted in 68 articles. After a careful analysis of the content of each paper, a total of 33 papers was selected based on their relevancy. We should integrate RFID with hospital information systems (HIS) and electronic health records (EHRs) and support it by clinical decision support systems (CDSS), it facilitates processes and reduce medical, medication and diagnosis errors.

  4. Radio Frequency Identification (RFID technology and patient safety

    Directory of Open Access Journals (Sweden)

    Sima Ajami

    2013-01-01

    Full Text Available Background: Radio frequency identification (RFID systems have been successfully applied in areas of manufacturing, supply chain, agriculture, transportation, healthcare, and services to name a few. However, the different advantages and disadvantages expressed in various studies of the challenges facing the technology of the use of the RFID technology have been met with skepticism by managers of healthcare organizations. The aim of this study was to express and display the role of RFID technology in improving patient safety and increasing the impact of it in healthcare. Materials and Methods: This study was non-systematical review, which the literature search was conducted with the help of libraries, books, conference proceedings, PubMed databases and also search engines available at Google, Google scholar in which published between 2004 and 2013 during Febuary 2013. We employed the following keywords and their combinations; RFID, healthcare, patient safety, medical errors, and medication errors in the searching areas of title, keywords, abstract, and full text. Results: The preliminary search resulted in 68 articles. After a careful analysis of the content of each paper, a total of 33 papers was selected based on their relevancy. Conclusion: We should integrate RFID with hospital information systems (HIS and electronic health records (EHRs and support it by clinical decision support systems (CDSS, it facilitates processes and reduce medical, medication and diagnosis errors.

  5. Radio Frequency Identification (RFID) technology and patient safety

    Science.gov (United States)

    Ajami, Sima; Rajabzadeh, Ahmad

    2013-01-01

    Background: Radio frequency identification (RFID) systems have been successfully applied in areas of manufacturing, supply chain, agriculture, transportation, healthcare, and services to name a few. However, the different advantages and disadvantages expressed in various studies of the challenges facing the technology of the use of the RFID technology have been met with skepticism by managers of healthcare organizations. The aim of this study was to express and display the role of RFID technology in improving patient safety and increasing the impact of it in healthcare. Materials and Methods: This study was non-systematical review, which the literature search was conducted with the help of libraries, books, conference proceedings, PubMed databases and also search engines available at Google, Google scholar in which published between 2004 and 2013 during Febuary 2013. We employed the following keywords and their combinations; RFID, healthcare, patient safety, medical errors, and medication errors in the searching areas of title, keywords, abstract, and full text. Results: The preliminary search resulted in 68 articles. After a careful analysis of the content of each paper, a total of 33 papers was selected based on their relevancy. Conclusion: We should integrate RFID with hospital information systems (HIS) and electronic health records (EHRs) and support it by clinical decision support systems (CDSS), it facilitates processes and reduce medical, medication and diagnosis errors. PMID:24381626

  6. Chinese Telephone Number-Input Technology and Its Applications in a Customer Service Call Center

    Institute of Scientific and Technical Information of China (English)

    罗仁; 许晓革; 兰德品; 郭盛芳

    2002-01-01

    The Chinese intelligence input technology, its applications, and a customer serv ice call center system are developed. This technology can be used both in stan dard English telephone number-input keyboard and in Chinese telephone number- input keyboard .And authors develop sophisticated technologies including "Pinyi n" (the Chinese p honetic alphabet ) encoding technology of phonetic symbol code and formal symbo l code of Chinese character structure, phrase encoding technology, input technol ogy of whole sentence intelligence encoding and input technology of Chinese tele phone number encoding.

  7. Optical and millimeter-wave radio seamless MIMO transmission based on a radio over fiber technology.

    Science.gov (United States)

    Kanno, Atsushi; Kuri, Toshiaki; Hosako, Iwao; Kawanishi, Tetsuya; Yoshida, Yuki; Yasumura, Yoshihiro; Kitayama, Ken-ichi

    2012-12-31

    Multi-input multi-output (MIMO) transmission of two millimeter-wave radio signals seamlessly converted from polarization-division-multiplexed quadrature-phase-shift-keying optical signals is successfully demonstrated, where a radio access unit basically consisting of only optical-to-electrical converters and a radio receiver performs total signal equalization of both the optical and the radio paths and demodulation with digital signal processing (DSP). Orthogonally polarized optical components that are directly converted to two-channel radio components can be demultiplexed and demodulated with high-speed DSP as in optical digital coherent detection. 20-Gbaud optical and radio seamless MIMO transmission provides a total capacity of 74.4 Gb/s with a forward error correction overhead of 7%.

  8. Technologies for Low Frequency Radio Observations of the Cosmic Dawn

    Science.gov (United States)

    Jones, Dayton L.

    2014-01-01

    The Jet Propulsion Laboratory (JPL) is developing concepts and technologies for low frequency radio astronomy space missions aimed at observing highly redshifted neutral Hydrogen from the Dark Ages. This is the period of cosmic history between the recombination epoch when the microwave background radiation was produced and the re-ionization of the intergalactic medium by the first generation of stars (Cosmic Dawn). This period, at redshifts greater than about 20, is a critical epoch for the formation and evolution of large-scale structure in the universe. The 21-cm spectral line of Hydrogen provides the most promising method for directly studying the Dark Ages, but the corresponding frequencies at such large redshifts are only tens of MHz and thus require space-based observations to avoid terrestrial RFI and ionospheric absorption and refraction. This paper reports on the status of several low frequency technology development activities at JPL, including deployable bi-conical dipoles for a planned lunar-orbiting mission, and both rover-deployed and inflation-deployed long dipole antennas for use on the lunar surface.

  9. TV and radio DBSs: Technology - International regulation - Economy

    Science.gov (United States)

    Davidts, D.; Dodel, H.

    1986-10-01

    The present status and future development of DBS systems are examined from a European perspective. The technology employed in current high-power DBSs is described, with a focus on TV-Sat, and the WARC-77 regulations are discussed. The advantages and disadvantages of high-power and low-power DBSs are compared with regard to spacecraft, launch, and maintenance costs; user requirements for fixed and mobile receivers; and worldwide marketing of DBS equipment. It is argued that only high-power DBSs will be able to assure (1) broad coverage (over all of Europe or at least for the FRG, France, Austria, and Switzerland) to receivers with small (60- or even 30-cm) antennas, (2) future implementability of high-definition TV and/or high-quality digital radio, (3) adaptability to changes in WARC regulations, and (4) credibility as a marketer of DBS technology to third-world areas requiring high power for geographic reasons. Diagrams, drawings, graphs, and tables of numerical data are provided.

  10. A Brief Overview of the Developments of the Cognitive Radio Technology

    National Research Council Canada - National Science Library

    Mayank Gupta , Nimrat Kumar Narula , VK Panchal , Ashok chandra

    2012-01-01

    Cognitive radio’s rising popularity among various engineers, scientists and researchers can be credited to the increasing number of users of wireless technology and the radio spectrum which is limited...

  11. The Key Technologies in Multi-Call Processing of the VoIP Gateway

    Institute of Scientific and Technical Information of China (English)

    HUANG Yong-feng; ZHU Ming-fang; BAI Yi-zhi

    2005-01-01

    Because Gateway serves many users, there are some related problems to be solved, such as the allocation and management of multiple calls, the synchronization of multiple threads, the state transference and time-out processing. To solve these problems, key technologies in our implementation will be proposed, which are important to the stability and efficiency of the Gateway. At last, the test of our Gateway is shown and analyzed.

  12. Radio frequency power sensor based on MEMS technology

    NARCIS (Netherlands)

    Fernandez, L.J.; Visser, Eelke; Sesé, J.; Wiegerink, Remco J.; Jansen, Henricus V.; Flokstra, Jan; Flokstra, Jakob; Elwenspoek, Michael Curt

    2003-01-01

    We present the first measurement results of a power sensor for radio frequency (rf) signals (50 kHz - 40 GHz) with almost no dissipation during the measurement. This sensor is, therefore, a 'through' power sensor, that means that the rf signal is available during the measurement of its power. The

  13. Software-Defined Ultra-wideband Radio Communications: A New RF Technology for Emergency Response Applications

    Energy Technology Data Exchange (ETDEWEB)

    Nekoogar, F; Dowla, F

    2009-10-19

    Reliable wireless communication links for local-area (short-range) and regional (long-range) reach capabilities are crucial for emergency response to disasters. Lack of a dependable communication system can result in disruptions in the situational awareness between the local responders in the field and the emergency command and control centers. To date, all wireless communications systems such as cell phones and walkie-talkies use narrowband radio frequency (RF) signaling for data communication. However, the hostile radio propagation environment caused by collapsed structures and rubble in various disaster sites results in significant degradation and attenuation of narrowband RF signals, which ends up in frequent communication breakdowns. To address the challenges of reliable radio communication in disaster fields, we propose an approach to use ultra-wideband (UWB) or wideband RF waveforms for implementation on Software Defined Radio (SDR) platforms. Ultra-wideband communications has been proven by many research groups to be effective in addressing many of the limitations faced by conventional narrowband radio technologies. In addition, LLNL's radio and wireless team have shown significant success in field deployment of various UWB communications system for harsh environments based on LLNL's patented UWB modulation and equalization techniques. Furthermore, using software defined radio platform for UWB communications offers a great deal of flexibility in operational parameters and helps the radio system to dynamically adapt itself to its environment for optimal performance.

  14. 60-GHz Millimeter-Wave Radio: Principle, Technology, and New Results

    Directory of Open Access Journals (Sweden)

    Nan Guo

    2006-12-01

    Full Text Available The worldwide opening of a massive amount of unlicensed spectra around 60 GHz has triggered great interest in developing affordable 60-GHz radios. This interest has been catalyzed by recent advance of 60-GHz front-end technologies. This paper briefly reports recent work in the 60-GHz radio. Aspects addressed in this paper include global regulatory and standardization, justification of using the 60-GHz bands, 60-GHz consumer electronics applications, radio system concept, 60-GHz propagation and antennas, and key issues in system design. Some new simulation results are also given. Potentials and problems are explained in detail.

  15. L2 Teachers' Experience of CALL Technology Education and the Use of Computer Technology in the Classroom: The Case of Franklin County, Ohio

    Science.gov (United States)

    Hong, Kwang Hee

    2009-01-01

    Primary issues concerned with CALL (Computer-Assisted Language Learning) teacher education are twofold: Integration of CALL technology into foreign and second language (L2) teacher education programs and L2 teachers' integration of CALL technology into their classroom. While increased attention has been paid to the former, only a small body of…

  16. The Collaborative Production of Responses and Dispatching on the Radio: Video Analysis in a Medical Emergency Call Center

    Directory of Open Access Journals (Sweden)

    Giolo Fele

    2008-10-01

    Full Text Available What happens when someone rings an emergency hotline for help? How is the emergency handled? How does the emergency service swing into action? Prompt and competent intervention and assessment of the gravity of the situation in a few crucial seconds: these are the quality standards that regulate the organization of emergency operations centers. For a number of years various groups of social science researchers have carried forward a program for the systematic study of work using ethnographic and naturalistic methods of analysis. An interest in work is certainly nothing new in the social sciences, and in sociology in particular. What is new, though, is the particular analytical viewpoint from which such research is now conducted. This program has dispensed with large-scale theorization and has concentrated on the empirical study of activities and practices, achieving an unprecedented level of detail and analytical fineness. Indeed, only by proceeding at this fine level of detail—made possible by the use of videorecordings—has it been possible to document the extraordinary and subtle collaborative production of work, and to do so at a level which extends well beyond the conscious awareness of people in their everyday routine. This aspect concerns in particular the capacity of the latest generation of studies of work to document the tacit procedures and forms of common-sense reasoning involved in the performance of tasks in concrete work settings. This paper focuses on the ways in which the dispatch is done in a medical emergency operation center. Although we know a great deal about the interaction between caller and call-taker from previous research, we know much less about the social organization that makes the dispatch possible. The data analyzed in this paper derive from a research project in which I have been engaged for a number of years on operation centers for the 118 emergency telephone number in Italy. Contrasting the data obtained

  17. A Review on Radio-Over-Fiber Technology-Based Integrated (Optical/Wireless) Networks

    Science.gov (United States)

    Rajpal, Shivika; Goyal, Rakesh

    2017-03-01

    In the present paper, radio-over-fiber (RoF) technology has been proposed, which is the integration of the optical and radio networks. With a high transmission capacity, comparatively low cost and low attenuation, optical fiber provides an ideal solution for accomplishing the interconnections. In addition, a radio system enables the significant mobility, flexibility and easy access. Therefore, the system integration can meet the increasing demands of subscribers for voice, data and multimedia services that require the access network to support high data rates at any time and any place inexpensively. RoF has the potentiality to the backbone of the wireless access network and it has gained significant momentum in the last decade as a potential last-mile access scheme. This paper gives the comprehensive review of RoF technology used in the communication system. Concept, applications, advantages and limitations of RoF technology are also discussed in this paper.

  18. Radio Frequency Identification (RFID) technology and patient safety

    National Research Council Canada - National Science Library

    Ajami, Sima; Rajabzadeh, Ahmad

    2013-01-01

    .... However, the different advantages and disadvantages expressed in various studies of the challenges facing the technology of the use of the RFID technology have been met with skepticism by managers...

  19. Radio frequency science considerations. [technology utilization of telecommunications system

    Science.gov (United States)

    Croft, T. A.

    1974-01-01

    Use of the 400 MHz telecommunications system to obtain scientific information, to provide backup information for the experiments flown, and to obtain measurements which aid in designing future probes is considered. Recommended objectives of such a program are summarized and include: measure 400 MHz amplitude to determine adsorption and perhaps scintillation (if data rate permits); measure noise strength near 400 MHz to reexamine 400 MHz choice and to observe thermal, cosmic, and local synchrotron noise trends; probe VSWR sensing to monitor integrity of system, icing, and possible plasma effects; after the probe is finished, have the bus radio occultation in the same region where the probe fell to evaluate the occultation.

  20. Coverage bias and sensitivity of variant calling for four whole-genome sequencing technologies.

    Directory of Open Access Journals (Sweden)

    Nora Rieber

    Full Text Available The emergence of high-throughput, next-generation sequencing technologies has dramatically altered the way we assess genomes in population genetics and in cancer genomics. Currently, there are four commonly used whole-genome sequencing platforms on the market: Illumina's HiSeq2000, Life Technologies' SOLiD 4 and its completely redesigned 5500xl SOLiD, and Complete Genomics' technology. A number of earlier studies have compared a subset of those sequencing platforms or compared those platforms with Sanger sequencing, which is prohibitively expensive for whole genome studies. Here we present a detailed comparison of the performance of all currently available whole genome sequencing platforms, especially regarding their ability to call SNVs and to evenly cover the genome and specific genomic regions. Unlike earlier studies, we base our comparison on four different samples, allowing us to assess the between-sample variation of the platforms. We find a pronounced GC bias in GC-rich regions for Life Technologies' platforms, with Complete Genomics performing best here, while we see the least bias in GC-poor regions for HiSeq2000 and 5500xl. HiSeq2000 gives the most uniform coverage and displays the least sample-to-sample variation. In contrast, Complete Genomics exhibits by far the smallest fraction of bases not covered, while the SOLiD platforms reveal remarkable shortcomings, especially in covering CpG islands. When comparing the performance of the four platforms for calling SNPs, HiSeq2000 and Complete Genomics achieve the highest sensitivity, while the SOLiD platforms show the lowest false positive rate. Finally, we find that integrating sequencing data from different platforms offers the potential to combine the strengths of different technologies. In summary, our results detail the strengths and weaknesses of all four whole-genome sequencing platforms. It indicates application areas that call for a specific sequencing platform and disallow other

  1. Biomedical Monitoring by a Novel Noncontact Radio Frequency Technology Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This technology will be a quantum advance in cardiac monitoring and will be applicable in numerous situations such as for immediate assessment and monitoring of...

  2. Radio frequency for particle accelerators: evolution and anatomy of a technology

    CERN Document Server

    Vretenar, M

    2011-01-01

    This introductory lecture outlines the impressive progress of radio frequency technology, from the first table-top equipment to the present gigantic installations. The outcome of 83 years of evolution is subsequently submitted to an anatomical analysis, which allows identifying the main components of a modern RF system and their interrelations.

  3. Challenges and opportunities of silent commerce - applying Radio Frequency Identification technology

    Directory of Open Access Journals (Sweden)

    Teuta Cata

    2006-04-01

    Full Text Available This research paper investigates applications of Radio Frequency Technology (RFID as an application of ubiquitous commerce. RFID has a wide application in the supply chain but still is very limited for customer support. This study introduces the concept of the Silent CRM (s-CRM which is an application of RFID to proactively support customer needs. Challenges of RFID application within companies, outside of companies and about the technology itself are discussed as well.

  4. Networking Technologies for Future Home Networks Using 60 GHz Radio

    NARCIS (Netherlands)

    Wang, J.

    2010-01-01

    Networking technologies have been changing the life of people in their private residential space. With the arrival of high definition (HD) multimedia services and broadband communications into the living space, future home networks are expected to support high speed device-to-device connectivity wit

  5. Networking Technologies for Future Home Networks Using 60 GHz Radio

    NARCIS (Netherlands)

    Wang, J.

    2010-01-01

    Networking technologies have been changing the life of people in their private residential space. With the arrival of high definition (HD) multimedia services and broadband communications into the living space, future home networks are expected to support high speed device-to-device connectivity

  6. A New Technology of Software Radio Based on Network-Visual Radio%基于计算机网络的下一代软件无线电

    Institute of Scientific and Technical Information of China (English)

    彭艺; 周正中; 姚绍文

    2003-01-01

    Using general- purpose platforms and software modules instead of application specific hardware can facili-tate application of the software radio technique using computer and network based architecture. As the developmentof network, a new technology of software radio based on network-Visual Radio is proposed. In this paper, wederivate the concept of Visual Radio which is based on network from Software Defined Radio's developing process; in-troduce its background and narrate its technical content and peculiarity,and expect its future.

  7. The Current Awareness of Radio Frequency Identification Technology

    Science.gov (United States)

    Janák, Erik

    2012-12-01

    The article can be divided into two constituent parts. In the first part is introduced the RFID reference model, which categorizes RFID applications into eight groups. In the second part are thereafter presented the results of the survey of the use of information and communication technologies in Slovak enterprises, which was conducted by the Slovak Statistical Office, as well as the results of own questionnaire survey, which was aimed to determine the level of current awareness of RFID use in Slovakia.

  8. RADIO OVER FIBER TECHNOLOGY USING ELECTRO-ABSORPTION MODULATION

    Directory of Open Access Journals (Sweden)

    SAURABH R. PRASAD

    2010-10-01

    Full Text Available The demand for bandwidth is increasing vigorously. Thus wired network is using fiber optic telephone line instead of coaxial cable. The concept of Fiber to the Home (FTTH is really coming into picture. Few countries like Japan, Korea etc are leading in this technology. But now the major challenge is how to provide the high speed internet connection wirelessly. Thus the change is to integrate the wireless and optical fiber communication.

  9. Cost-effective backhaul design using hybrid radio/free-space optical technology

    KAUST Repository

    Douik, Ahmed S.

    2015-06-08

    The deluge of date rate in today\\'s networks poses a cost burden on the backhaul network design. Developing cost efficient backhaul solutions becomes an interesting, yet challenging, problem. Traditional technologies for backhaul networks include either radio-frequency backhauls (RF) or optical fibres (OF). While RF is a cost-effective solution as compared to OF, it supports lower data rate requirements. Another promising backhaul solution that may combine both a high data rate and a relatively low cost is the free-space optics (FSO). FSO, however, is sensitive to nature conditions (e.g., rain, fog, line-ofsight, etc.). A more reliable alternative is, therefore, to combine RF and FSO solutions through a hybrid structure called hybrid RF/FSO. Consider a backhaul network, where the base-stations (BS) can be connected to each other either via OF or hybrid RF/FSO backhaul links. The paper addresses the problem of minimizing the cost of backhaul planning under connectivity and data rates constraints, so as to choose the appropriate costeffective backhaul type between BSs (i.e., either OF or hybrid RF/FSO). The paper solves the problem using graph theory techniques by introducing the corresponding planning graph. It shows that under a specified realistic assumption about the cost of OF and hybrid RF/FSO links, the problem is equivalent to a maximum weight clique problem, which can be solved with moderate complexity. Simulation results show that our proposed solution shows a close-to-optimal performance, especially for practical prices of the hybrid RF/FSO.

  10. The Impact of CALL Instruction on English Language Teachers' Use of Technology in Language Teaching

    Science.gov (United States)

    Kiliçkaya, Ferit; Seferoglu, Gölge

    2013-01-01

    This study investigates the impact of CALL training on in-service language teachers' use of CALL-based activities in their classrooms. The participants included 35 pre-service English as a Foreign Language (EFL) teachers who took an undergraduate-level elective CALL course (FLE318) offered during the 2008-2009 academic year in the Department of…

  11. Applying radio-frequency identification (RFID) technology in transfusion medicine.

    Science.gov (United States)

    Hohberger, Clive; Davis, Rodeina; Briggs, Lynne; Gutierrez, Alfonso; Veeramani, Dhamaraj

    2012-05-01

    ISO/IEC 18000-3 mode 1 standard 13.56 MHz RFID tags have been accepted by the International Society for Blood Transfusion (ISBT) and the United States Food and Drug Administration (FDA) as data carriers to integrate with and augment ISBT 128 barcode data carried on blood products. The use of 13.56 MHz RFID carrying ISBT 128 data structures allows the global deployment and use of RFID, supporting both international transfer of blood and international disaster relief. The deployment in process at the BloodCenter of Wisconsin and testing at the University of Iowa Health Center is the first FDA-permitted implementation of RFID throughout in all phases of blood banking, donation through transfusion. RFID technology and equipment selection will be discussed along with FDA-required RF safety testing; integration with the blood enterprise computing system and required RFID tag performance. Tag design and survivability is an issue due to blood bag centrifugation and irradiation. Deployment issues will be discussed. Use of RFID results in significant return on investment over the use of barcodes in the blood center operations through labor savings and error reduction. Copyright © 2011 The International Alliance for Biological Standardization. Published by Elsevier Ltd. All rights reserved.

  12. 78 FR 49529 - Radio Frequency Wireless Technology in Medical Devices; Guidance for Industry and Food and Drug...

    Science.gov (United States)

    2013-08-14

    ... of RF energy, and the RF wireless emissions from one product or device could potentially affect the... HUMAN SERVICES Food and Drug Administration (formerly Docket No. 2006D-0504) Radio Frequency Wireless...) is announcing the availability of the guidance entitled ``Radio Frequency Wireless Technology in...

  13. High performance superconducting radio frequency ingot niobium technology for continuous wave applications

    Energy Technology Data Exchange (ETDEWEB)

    Dhakal, Pashupati, E-mail: dhakal@jlab.org; Ciovati, Gianluigi, E-mail: gciovati@jlab.org; Myneni, Ganapati R., E-mail: rao@jlab.org [Thomas Jefferson National Accelerator Facility, 12000 Jefferson Avenue, Newport News, VA 23606 (United States)

    2015-12-04

    Future continuous wave (CW) accelerators require the superconducting radio frequency cavities with high quality factor and medium accelerating gradients (≤20 MV/m). Ingot niobium cavities with medium purity fulfill the specifications of both accelerating gradient and high quality factor with simple processing techniques and potential reduction in cost. This contribution reviews the current superconducting radiofrequency research and development and outlines the potential benefits of using ingot niobium technology for CW applications.

  14. Radio Electric Asymmetric Conveyer: A Novel Neuromodulation Technology in Alzheimer’s and Other Neurodegenerative Diseases

    OpenAIRE

    2015-01-01

    Global research in the field of pharmacology has not yet found effective drugs to treat Alzheimer's disease. Thus, alternative therapeutic strategies are under investigation, such as neurostimulation by physical means. Radio electric asymmetric conveyer (REAC) is one of these technologies and has, until now, been used in clinical studies on several psychiatric and neurological disorders with encouraging results in the absence of side effects. Moreover, studies at the cellular level have shown...

  15. Reconfigurable Transceiver and Software-Defined Radio Architecture and Technology Evaluated for NASA Space Communications

    Science.gov (United States)

    Reinhart, Richard C.; Kacpura, Thomas J.

    2004-01-01

    The NASA Glenn Research Center is investigating the development and suitability of a software-based open-architecture for space-based reconfigurable transceivers (RTs) and software-defined radios (SDRs). The main objectives of this project are to enable advanced operations and reduce mission costs. SDRs are becoming more common because of the capabilities of reconfigurable digital signal processing technologies such as field programmable gate arrays and digital signal processors, which place radio functions in firmware and software that were traditionally performed with analog hardware components. Features of interest of this communications architecture include nonproprietary open standards and application programming interfaces to enable software reuse and portability, independent hardware and software development, and hardware and software functional separation. The goals for RT and SDR technologies for NASA space missions include prelaunch and on-orbit frequency and waveform reconfigurability and programmability, high data rate capability, and overall communications and processing flexibility. These operational advances over current state-of-art transceivers will be provided to reduce the power, mass, and cost of RTs and SDRs for space communications. The open architecture for NASA communications will support existing (legacy) communications needs and capabilities while providing a path to more capable, advanced waveform development and mission concepts (e.g., ad hoc constellations with self-healing networks and high-rate science data return). A study was completed to assess the state of the art in RT architectures, implementations, and technologies. In-house researchers conducted literature searches and analysis, interviewed Government and industry contacts, and solicited information and white papers from industry on space-qualifiable RTs and SDRs and their associated technologies for space-based NASA applications. The white papers were evaluated, compiled, and

  16. Radio frequency identification (RFID technology for academic, logistics and passenger transport applications

    Directory of Open Access Journals (Sweden)

    John Jairo Ramírez Echeverry

    2012-12-01

    Full Text Available Radio frequency identification (RFID technology, from its beginning in the 1980s, has provided solutions in areas in which no identification (ID technology has done so before.  This paper presents three applications in areas having an issue in common: an RFID technology-based solution; these fields were academic topics, logistic support for an event and passenger land transport. Each project identified a problem which needed resolving, the methods and electronic devices used for such solution and the outcomes achieved. The developments shown in this paper indicated the multidisciplinary nature of RFID technology because it achieved new solutions for identifying objects or people in many contexts and not just the consumer goods trade which is the application nowadays most known for using this technology. These projects were developed by members of the Universidad Nacional de Colombia’s High Frequency Electronics and Telecommunications Research Group (CMUN (website: www.cmun.unal.edu.co.

  17. A study on retrieval of article and making database in radio technology with personal computer

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Sung Hwan [College of Medicine, Hallym Univ., Anyang (Korea, Republic of)

    1997-02-01

    Although many useful articles appear in journals published in Korea, they are not always cited by researchers mainly due to absence of efficient searching system. The author made a program with 4 predefined filtering forms to detect published articles rapidly and accurately. The program was coded using database management system CA-Clipper VER 5.2. I used 486DX-II(8 Mbyte Ram, VGA, 560 Mbyte Hard Disk), desk-jet printer(HP-560k), and MS-DOS VER 5.0. I inputed twenty articles in the journal of Korean Society Radio technological Technology, And this program test for retrieve article and made database.

  18. Coverage Range and Cost Comparison of Remote Antenna Unit Designs for Inbuilding Radio over Fiber Technology

    Directory of Open Access Journals (Sweden)

    Razali Ngah

    2013-09-01

    Full Text Available Future communication needs to be ubiquitous, broadband, convergent, and seamless. Radio over fiber (RoF technology is one of the most important enabler in access network for the technologies. Adoption of RoF faces bottleneck in optoelectronics, that they are still expensive, high power consumption, and limited in bandwidth. To solve the problem, transceiver in remote antenna unit (RAU is developed, i.e. electroabsorption transceiver (EAT and asymmetric FabryPerot modulator (AFPM. This paper compares their coverage range and cost in providing WCDMA and WLAN services. Needed gain of RF amplifier for supporting picocell is also discussed.

  19. Media Technology and Modernity: An Investigation of Radio Usage and Urban Life in the 1930s Colonial Taiwan

    Directory of Open Access Journals (Sweden)

    Sumei Wang

    2016-04-01

    Full Text Available This article explores the everyday usage of radio in the 1930s colonial Taiwan. Situating in the narrations of urban life provided by ‘Inviolable Destiny’, the article aims to depict the complicated networks constituted by radio and other media technologies, and to investigate the inter-relationships between new media technologies, consumerism and modernity. Being influenced by globalization, Japan witnessed huge transformations of lifestyles and the rise of mass media and popular culture during the interwar period. Radio was introduced to Taiwan by its ruler with great enthusiasm toward modernity. Although it was the colonizer’s intention to discipline the colonized by means of radio, the medium turned into an important source of information and entertainment for lay people. The radio also privatized synchronization and made punctuality an inseparable part of modern life. It affected the rhythms of cities and brought Taiwan into the complex systems of capitalism and globalization.

  20. Evolution of Monolithic Technology for Wireless Communications: GaN MMIC Power Amplifiers For Microwave Radios

    Directory of Open Access Journals (Sweden)

    Vittorio Camarchia

    2014-09-01

    Full Text Available This paper presents the progress of monolithic technology for microwaveapplication, focusing on gallium nitride technology advances in the realization of integratedpower amplifiers. Three design examples, developed for microwave backhaul radios, areshown. The first design is a 7 GHz Doherty developed with a research foundry, while thesecond and the third are a 7 GHz Doherty and a 7–15 GHz dual-band combined poweramplifiers, both based on a commercial foundry process. The employed architectures, themain design steps and the pros and cons of using gallium nitride technology are highlighted.The measured performance demonstrates the potentialities of the employed technology, andthe progress in the accuracy, reliability and performance of the process.

  1. Technology Development for Large Radio Arrays at the Jet Propulsion Laboratory

    Science.gov (United States)

    Jones, Dayton L.; Preston, R.; Navarro, R.; Wagstaff, K.; Mattmann, C.; D'Addario, L.; Thompson, D.; Majid, W.; Lazio, J.

    2011-05-01

    Future radio arrays are likely to include far more antennas than current arrays, ultimately culminating in the Square Kilometre Array. During the past 1.5 years JPL personnel have been working on technologies to address the challenges of such large arrays, including lower power digital signal processing, real-time data adaptive algorithms, and large-scale data archiving and mining. Power consumption by digital electronics may be a dominant component of the operating costs of large arrays. The choice of architecture for cross-correlation of thousands of antennas can have an orders-of-magnitude impact on power consumption. A power efficient architecture for a very-large-N array has been found. A second area of development at JPL is adaptive algorithms to perform real-time processing of data in high volume data flows, when storage of raw data for later processing is not an option. Algorithms to enable real-time detection of fast radio transients are being tested on the VLBA, and will be deployed as part of the CRAFT collaboration on ASKAP and potentially at other observatories. Finally, large radio arrays will produce extremely large data archives. We are working on applying a scalable framework for managing and mining large data archives to radio array needs. This framework is JPL's open source Process Control System, initially built for archiving data from NASA Earth Science missions and now used in a number of applications outside of astronomy. This work has been carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

  2. Instrument technology for magnetosphere plasma imaging from high Earth orbit. Design of a radio plasma sounder

    Science.gov (United States)

    Haines, D. Mark; Reinisch, Bodo W.

    1995-01-01

    The use of radio sounding techniques for the study of the ionospheric plasma dates back to G. Briet and M. A. Tuve in 1926. Ground based swept frequency sounders can monitor the electron number density (N(sub e)) as a function of height (the N(sub e) profile). These early instruments evolved into a global network that produced high-resolution displays of echo time delay vs frequency on 35-mm film. These instruments provided the foundation for the success of the International Geophysical Year (1958). The Alouette and International Satellites for Ionospheric Studies (ISIS) programs pioneered the used of spaceborne, swept frequency sounders to obtain N(sub e) profiles of the topside of the ionosphere, from a position above the electron density maximum. Repeated measurements during the orbit produced an orbital plane contour which routinely provided density measurements to within 10%. The Alouette/ISIS experience also showed that even with a high powered transmitter (compared to the low power sounder possible today) a radio sounder can be compatible with other imaging instruments on the same satellite. Digital technology was used on later spacecraft developed by the Japanese (the EXOS C and D) and the Soviets (Intercosmos 19 and Cosmos 1809). However, a full coherent pulse compression and spectral integrating capability, such as exist today for ground-based sounders (Reinisch et al., 1992), has never been put into space. NASA's 1990 Space Physics Strategy Implementation Study "The NASA Space Physics Program from 1995 to 2010" suggested using radio sounders to study the plasmasphere and the magnetopause and its boundary layers (Green and Fung, 1993). Both the magnetopause and plasmasphere, as well as the cusp and boundary layers, can be observed by a radio sounder in a high-inclination polar orbit with an apogee greater than 6 R(sub e) (Reiff et al., 1994; Calvert et al., 1995). Magnetospheric radio sounding from space will provide remote density measurements of

  3. A Decade of Developing Radio-Astronomy Instrumentation using CASPER Open-Source Technology

    CERN Document Server

    Hickish, Jack; Ali, Zaki; Buch, Kaushal D; Chaudhari, Sandeep C; Chen, Hong; Dexter, Matthew; Domagalski, Rachel Simone; Ford, John; Foster, Griffin; George, David; Greenberg, Joe; Greenhill, Lincoln; Isaacson, Adam; Jiang, Homin; Jones, Glenn; Kapp, Francois; Kriel, Henno; Lacasse, Rich; Lutomirski, Andrew; MacMahon, David; Manley, Jason; Martens, Andrew; McCullough, Randy; Muley, Mekhala V; New, Wesley; Parsons, Aaron; Price, Daniel C; Primiani, Rurik A; Ray, Jason; Siemion, Andrew; Van Tonder, Verees'e; Vertatschitsch, Laura; Wagner, Mark; Weintroub, Jonathan; Werthimer, Dan

    2016-01-01

    The Collaboration for Astronomy Signal Processing and Electronics Research (CASPER) has been working for a decade to reduce the time and cost of designing, building and deploying new digital radio-astronomy instruments. Today, CASPER open-source technology powers over 45 scientific instruments worldwide, and is used by scientists and engineers at dozens of academic institutions. In this paper we catalog the current offerings of the CASPER collaboration, and instruments past and present built by CASPER users and developers. We describe the ongoing state of software development, as CASPER looks to support a broader range of programming environments and hardware and ensure compatibility with the latest vendor tools.

  4. Implementing Tasks with Interactive Technologies in Classroom Computer Assisted Language Learning (CALL): Towards a Developmental Framework

    Science.gov (United States)

    Whyte, Shona; Alexander, Julie

    2014-01-01

    Classroom foreign language teachers using technology in task-based language teaching (TBLT) may experience pedagogical regression during technological development (Fullan, 2001), and fail to transform pedagogy because tools like interactive whiteboards (IWBs) support traditional as well as newer approaches (Avvisati et al., 2013). IWB-supported…

  5. Educational Technology Diffusion in Organizations: A Call for Systemic Vision and Organizational Development

    Science.gov (United States)

    Trentin, Guglielmo

    2012-01-01

    The research and development in Europe of new educational technologies and methodologies is in continuous progress. We are not, however, seeing at the same time an equally wide diffusion of these technologies and methodologies in organizational contexts (Blain, 2011). In short, there is a quite marked difference between the speed with which…

  6. Implementation of a Dual Containment/Surveillance System utilizing scene-change detection and radio frequency technology

    Energy Technology Data Exchange (ETDEWEB)

    FITZGERALD, ERIC; KOENIG, RICHARD

    2005-06-27

    This paper will examine the implementation of scene-change detection and radio frequency technology within a Dual Containment/Surveillance (C/S) System. Additionally, this paper will examine the human performance factors in the operation of these systems. Currently, Westinghouse Savannah River Company utilizes the Continuous Item Monitoring and Surveillance System (CIMS) in the performance of Dual C/S to monitor special nuclear materials within International Atomic Energy Agency (IAEA) Safeguards and Domestic Safeguards. CIMS is comprised of the Material Monitoring System (MMS) (R), a multi-media electronic surveillance system developed by Sandia National Laboratory which incorporates the use of active seals commonly called Radio Frequency Tamper Indicating Devices (RFTIDs), NT Vision (R) as developed by Los Alamos National Laboratory, a Microsoft Windows NT (R) based operating system providing for domestic scene-change detection and the Digital Multi-Camera Optical Surveillance System (DMOS) (R) which provides scene-change detection for IAEA. Although this paper will focus on the implementation of Dual C/S utilizing the Continuous Item Monitoring and Surveillance System, the necessity for a thorough review of Safeguards and Security requirements with organizations and personnel having minimal to no prior MPC&A training will also be covered. Successful Dual C/S implementation plans must consider not only system design and failure modes, but must also be accompanied with the appropriate ''mind shift'' within operations and technical personnel. This is required to ensure completion of both physical and electronic activities, and system design changes are performed conscientiously and with full awareness of MPC&A requirements.

  7. Evaluation of current literature to determine the potential effects of radio frequency identification on technology used in diabetes care.

    Science.gov (United States)

    Christe, Barbara

    2009-03-01

    This article examines recently published studies exploring the impact of radio frequency identification (RFID) systems on the technology involved in patient care. The conclusions will be extrapolated to include insulin delivery devices. Background material will also be presented to support examination of the variables involved in electromagnetic fields and potential interference from these RFID systems. (c) 2009 Diabetes Technology Society.

  8. The Engineering Development Array: A Low Frequency Radio Telescope Utilising SKA Precursor Technology

    Science.gov (United States)

    Wayth, Randall; Sokolowski, Marcin; Booler, Tom; Crosse, Brian; Emrich, David; Grootjans, Robert; Hall, Peter J.; Horsley, Luke; Juswardy, Budi; Kenney, David; Steele, Kim; Sutinjo, Adrian; Tingay, Steven J.; Ung, Daniel; Walker, Mia; Williams, Andrew; Beardsley, A.; Franzen, T. M. O.; Johnston-Hollitt, M.; Kaplan, D. L.; Morales, M. F.; Pallot, D.; Trott, C. M.; Wu, C.

    2017-08-01

    We describe the design and performance of the Engineering Development Array, which is a low-frequency radio telescope comprising 256 dual-polarisation dipole antennas working as a phased array. The Engineering Development Array was conceived of, developed, and deployed in just 18 months via re-use of Square Kilometre Array precursor technology and expertise, specifically from the Murchison Widefield Array radio telescope. Using drift scans and a model for the sky brightness temperature at low frequencies, we have derived the Engineering Development Array's receiver temperature as a function of frequency. The Engineering Development Array is shown to be sky-noise limited over most of the frequency range measured between 60 and 240 MHz. By using the Engineering Development Array in interferometric mode with the Murchison Widefield Array, we used calibrated visibilities to measure the absolute sensitivity of the array. The measured array sensitivity matches very well with a model based on the array layout and measured receiver temperature. The results demonstrate the practicality and feasibility of using Murchison Widefield Array-style precursor technology for Square Kilometre Array-scale stations. The modular architecture of the Engineering Development Array allows upgrades to the array to be rolled out in a staged approach. Future improvements to the Engineering Development Array include replacing the second stage beamformer with a fully digital system, and to transition to using RF-over-fibre for the signal output from first stage beamformers.

  9. Impact of radio-frequency identification (RFID) technologies on the hospital supply chain: a literature review.

    Science.gov (United States)

    Coustasse, Alberto; Tomblin, Shane; Slack, Chelsea

    2013-01-01

    Supply costs account for more than one-third of the average operating budget and constitute the second largest expenditure in hospitals. As hospitals have sought to reduce these costs, radio-frequency identification (RFID) technology has emerged as a solution. This study reviews existing literature to gauge the recent and potential impact and direction of the implementation of RFID in the hospital supply chain to determine current benefits and barriers of adoption. Findings show that the application of RFID to medical equipment and supplies tracking has resulted in efficiency increases in hospitals with lower costs and increased service quality. RFID technology can reduce costs, improve patient safety, and improve supply chain management effectiveness by increasing the ability to track and locate equipment, as well as monitoring theft prevention, distribution management, and patient billing. Despite ongoing RFID implementation in the hospital supply chain, barriers to widespread and rapid adoption include significant total expenditures, unclear return on investment, and competition with other strategic imperatives.

  10. On-call service of neurosurgeons in Germany: organization, use of communication services, and personal acceptance of modern technologies.

    Science.gov (United States)

    Brenke, Christopher; Lassel, Elke A; Terris, Darcey; Kurt, Aysel; Schmieder, Kirsten; Schoenberg, Stefan O; Weisser, Gerald

    2014-05-01

    A significant proportion of acute care neurosurgical patients present to hospital outside regular working hours. The objective of our study was to evaluate the structure of neurosurgical on-call services in Germany, the use of modern communication devices and teleradiology services, and the personal acceptance of modern technologies by neurosurgeons. A nationwide survey of all 141 neurosurgical departments in Germany was performed. The questionnaire consisted of two parts: one for neurosurgical departments and one for individual neurosurgeons. The questionnaire, available online and mailed in paper form, included 21 questions about on-call service structure; the availability and use of communication devices, teleradiology services, and other information services; and neurosurgeons' personal acceptance of modern technologies. The questionnaire return rate from departments was 63.1% (89/141), whereas 187 individual neurosurgeons responded. For 57.3% of departments, teleradiology services were available and were frequently used by 62.2% of neurosurgeons. A further 23.6% of departments described using smartphone screenshots of computed tomography (CT) images transmitted by multimedia messaging service (MMS), and 8.6% of images were described as sent by unencrypted email. Although 47.0% of neurosurgeons reported owning a smartphone, only 1.1% used their phone for on-call image communication. Teleradiology services were observed to be widely used by on-call neurosurgeons in Germany. Nevertheless, a significant number of departments appear to use outdated techniques or techniques that leave patient data unprotected. On-call neurosurgeons in Germany report a willingness to adopt more modern approaches, utilizing readily available smartphones or tablet technology. Georg Thieme Verlag KG Stuttgart · New York.

  11. The Cubesat Radiometer Radio Frequency Interference Technology Validation (CubeRRT) Mission

    Science.gov (United States)

    Misra, S.; Johnson, J. T.; Ball, C.; Chen, C. C.; Smith, G.; McKelvey, C.; Andrews, M.; O'Brien, A.; Kocz, J.; Jarnot, R.; Brown, S. T.; Piepmeier, J. R.; Lucey, J.; Miles, L. R.; Bradley, D.; Mohammed, P.

    2016-12-01

    Passive microwave measurements made below 40GHz have experienced increased amounts of man-made radio frequency interference (RFI) over the past couple of decades. Such RFI has had a degenerative impact on various important geophysical retrievals such as soil-moisture, sea-surface salinity, atmospheric water vapor, precipitation etc. The commercial demand for spectrum allocation has increased over the past couple of years - infringing on frequencies traditionally reserved for scientific uses such as Earth observation at passive microwave frequencies. With the current trend in shared spectrum allocations, future microwave radiometers will have to co-exist with terrestrial RFI sources. The CubeSat Radiometer Radio Frequency Interference Technology Validation (CubeRRT) mission is developing a 6U Cubesat system to demonstrate RFI detection and filtering technologies for future microwave radiometer remote sensing missions. CubeRRT will operate between 6-40GHz, and demonstrate on-board real-time RFI detection on Earth brightness temperatures tuned over 1GHz steps. The expected launch date for CubeRRT is early 2018. Digital subsystems for higher frequency microwave radiometry require a larger bandwidth, as well as more processing power and on-board operation capabilities for RFI filtering. Real-time and on-board RFI filtering technology development is critical for future missions to allow manageable downlink data volumes. The enabling CubeRRT technology is a digital FPGA-based spectrometer with a bandwidth of 1 GHz that is capable of implementing advanced RFI filtering algorithms that use the kurtosis and cross-frequency RFI detection methods in real-time on board the spacecraft. The CubeRRT payload consists of 3 subsystems: a wideband helical antenna, a tunable analog radiometer subsystem, and a digital backend. The following presentation will present an overview of the system and results from the latest integration and test.

  12. Information technology - Telecommunications and information exchange between systems - Private integrated services network - Specification, functional model and information flows - Call interception additional network feature

    CERN Document Server

    International Organization for Standardization. Geneva

    2003-01-01

    Information technology - Telecommunications and information exchange between systems - Private integrated services network - Specification, functional model and information flows - Call interception additional network feature

  13. Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Call transfer supplementary service

    CERN Document Server

    International Organization for Standardization. Geneva

    2003-01-01

    Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Call transfer supplementary service

  14. Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Inter-exchange signalling protocol - Call interception additional network feature

    CERN Document Server

    International Organization for Standardization. Geneva

    2003-01-01

    Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Inter-exchange signalling protocol - Call interception additional network feature

  15. Information technology - Telecommunications and information exchange between systems - Private integrated services network - Inter-exchange signalling protocol - Single step call transfer supplementary service

    CERN Document Server

    International Organization for Standardization. Geneva

    2003-01-01

    Information technology - Telecommunications and information exchange between systems - Private integrated services network - Inter-exchange signalling protocol - Single step call transfer supplementary service

  16. Technology or Process First? A Call for Mediation Between ESM and BPM Approaches in Organizations

    DEFF Research Database (Denmark)

    Siurdyban, Artur; Svejvig, Per; Møller, Charles

    2011-01-01

    Enterprise Systems Management (ESM) and Business Process Management (BPM), although highly correlated, have evolved as alternative and mutually exclusive approaches to corporate infrastructure. As a result, companies struggle to nd the right balance between technology and process factors...... in infrastructure implementation projects. The purpose of this paper is articulate a need and a direction to mediate between the process-driven and the technology-driven approaches. Using a cross-case analysis, we gain insight into two examples of systems and process implementation. We highlight the dierences...... between them using strategic alignment, Enterprise Systems and Business Process Management theories. We argue that the insights from these cases can lead to a better alignment between process and technology. Implications for practice include the direction towards a closer integration of process...

  17. Adaptive Traffic Route Control in QoS Provisioning for Cognitive Radio Technology with Heterogeneous Wireless Systems

    Science.gov (United States)

    Yamamoto, Toshiaki; Ueda, Tetsuro; Obana, Sadao

    As one of the dynamic spectrum access technologies, “cognitive radio technology,” which aims to improve the spectrum efficiency, has been studied. In cognitive radio networks, each node recognizes radio conditions, and according to them, optimizes its wireless communication routes. Cognitive radio systems integrate the heterogeneous wireless systems not only by switching over them but also aggregating and utilizing them simultaneously. The adaptive control of switchover use and concurrent use of various wireless systems will offer a stable and flexible wireless communication. In this paper, we propose the adaptive traffic route control scheme that provides high quality of service (QoS) for cognitive radio technology, and examine the performance of the proposed scheme through the field trials and computer simulations. The results of field trials show that the adaptive route control according to the radio conditions improves the user IP throughput by more than 20% and reduce the one-way delay to less than 1/6 with the concurrent use of IEEE802.16 and IEEE802.11 wireless media. Moreover, the simulation results assuming hundreds of mobile terminals reveal that the number of users receiving the required QoS of voice over IP (VoIP) service and the total network throughput of FTP users increase by more than twice at the same time with the proposed algorithm. The proposed adaptive traffic route control scheme can enhance the performances of the cognitive radio technologies by providing the appropriate communication routes for various applications to satisfy their required QoS.

  18. Innovate-Ideagora: A Call for Sustainable Development in Instructional Technology

    Science.gov (United States)

    Easton, Denise; McCord, Alan

    2009-01-01

    In this edition of Innovate-Ideagora, Al McCord and Denise Easton report on developments in this online community, which now boasts over 400 members. As members engaged in active discussions about ways to support sustainable, accessible technologies, discussion coalesced around rumors of a $10 laptop and what such a development might mean for…

  19. Serendipity, International Cooperation and Navigational Aids: A History of Radio Echo Sounding (RES) Technologies, 1958-1979

    Science.gov (United States)

    Turchetti, S.; Dean, K.; Naylor, S.; Siegert, M. J.

    2006-12-01

    This paper explores the history of RES and examines major technological advances that fostered the use of this technique in the sub-glacial exploration of Antarctica. The paper will especially focus on three themes: the role played by accidental discoveries in the origins of RES; the importance of international collaboration in its technological development; and the need of establishing new technological networks in the deployment of RES apparatus during Antarctic missions. The origins of RES can be traced back to two important -albeit accidental- findings. First, during post-war US military operations in the Antarctic radio altimeters produced gross errors in height indication. Furthermore, during the IGY ionospheric research and sounding was hampered by interference due to bottom echoes. These serendipitous events helped to figure out that the Antarctic ice was transparent to certain frequencies, and therefore new radio technologies could be used to sound what lay beneath it. The establishment of the Scientific Committee on Antarctic Research (SCAR) and the Antarctic Treaty (AT) provided a new international framework vital to the development of RES technologies. This allowed researchers from different countries to come together and discuss important technological features for the first time. At a technical level, the setting up of international experiments (such as those of 1963 and 1964 in Greenland) gave an opportunity for experts from different countries to compare the performance of new RES apparatus. At a political level, the parallel debate within the AT community on the allocation of Antarctic radio frequencies helped radio engineers to work out ways to circumvent interference with radio communications. Finally, the deployment of RES equipment in Antarctic exploration relied upon a number of technological aids to improve the potential and accuracy of geophysical sounding. The use of new aircrafts, guidance systems, and computers proved vital in many

  20. An Industrial Technology Called Tribiology--the UK Experience and Its Implications

    Science.gov (United States)

    1976-08-27

    metallurgy) and design (mechanical engineering), but rather that a new technological type was needed: a Tribologist. Thus a strong interdisciplinary... strong government support in the beginning, and this "fly- ing start" was more than enough to ensure a sustained flurry of activity from the...of experimental techniques in their EHM program. Dr. G. Pocock is using x-ray fluorescence to analyze for iron in lubricat- ing oil. A wear device is

  1. A Study to Increase the Quality of Financial and Operational Performances of Call Centers using Speech Technology

    Directory of Open Access Journals (Sweden)

    R. Manoharan

    2015-04-01

    Full Text Available Everyone knows technology and automation are not the solutions to every business problem. But when used for the right reasons-and deployed and maintained wisely-speech based contact center applications can be good for the customers as well as business, if the money and time spent to implement and maintain contact center business. Speech based application is an experimental conversational speech system. Experience with redesigning the system based on user feedback indicates the importance of adhering to conversational conventions when designing speech interfaces, particularly in the face of speech recognition errors. Study results also suggest that speech-only interfaces should be designed from scratch rather than directly translated from their graphical counterparts. This paper examines a set of challenging issues facing speech interface designers and describes approaches to address some of these challenges. Let us highlight some of the specific constrains involved in this process of using speech technology in the main stream of business in general and of a Call Center specific and being resolved through the Industrial process. So the real challenge is “Developing a new Business Process Model for an Industry application, for a Call Center specific. And that paves the way to design and analyze the “Financial and Operational performance of call centers through the business process model using speech technology”.

  2. Management of Enterprise Information Systems: call for a new technology landscape framework

    DEFF Research Database (Denmark)

    Møller, Charles

    2007-01-01

    Standardised Enterprise Information Systems (EIS) are increasingly setting the agenda and the pace for the development of many organisations. Organisations are required not only to establish effective business processes but also to accommodate for changing business conditions. The vendors...... transformation cases. This paper discusses future challenges for research on EIS, and it concludes that the EIS industry has a significant and increasing impact on enterprises due to the EIS enabled transformation of the business. Consequently, continued management of EIS after going-live is required, but most...... important, EIS research needs to refocus on the EIS technology landscape and embrace this new challenge....

  3. An intelligent health monitoring system using radio-frequency identification technology.

    Science.gov (United States)

    Lai, Yeong-Lin; Chen, Chin-Ling; Chang, Ching-Hisang; Hsu, Chih-Yu; Lai, Yeong-Kang; Tseng, Kuo-Kun; Chen, Chih-Cheng; Zheng, Chun-Yi

    2015-01-01

    Long-term care (LTC) for the elderly has become extremely important in recent years. It is necessary for the different physiological monitoring systems to be integrated on the same interface to help oversee and manage the elderly's needs. This paper presents a novel health monitoring system for LTC services using radio-frequency identification (RFID) technology. Dual-band RFID protocols were included in the system, in which the high-frequency (HF) band of 13.56 MHz was used to identify individuals and the microwave band of 2.45 GHz was used to monitor physiological information. Distinct physiological data, including oxyhemoglobin saturation by pulse oximetry (SpO2), blood pressure, blood sugar, electrocardiogram (ECG) readings, body temperature, and respiration rate, were monitored by various biosensors. The intelligent RFID health monitoring system provided the features of the real-time acquisition of biomedical signals and the identification of personal information pertaining to the elderly and patients in nursing homes.

  4. JPL Technology Development for the Dark Ages Radio Explorer (DARE) Proposal

    Science.gov (United States)

    Jones, Dayton L.; Lazio, J.; Sanchez Barbetty, M.; Sigel, D.; O'Dwyer, I.

    2014-01-01

    In support of the Dark Ages Radio Explorer (DARE) proposal team, the Jet Propulsion Laboratory (JPL) has been investigating several technologies for this mission. The goal of DARE is to measure the sky-integrated spectrum of highly redshifted Hydrogen from the radio-quiet region above the far side of the Moon. The detailed shape of the spectrum in the 40-120 MHz region contains information on the epoch compact object formation and subsequent re-heating of the intergalactic medium. However, the expected Hydrogen signal strength is orders of magnitude weaker than the galactic foreground, and extreme instrumental stability and calibration accuracy will be needed to extract the signal of interest from the stronger foreground signal. JPL has developed a deployable bi-conical dipole antenna and measured its RF performance against a full-size, solid dipole to verify that the deployable concept will not compromise the spectral bandpass of the instrument. In addition, variations in bandpass response as a function of physical temperature of the front-end electronics (active balun and receiver) have been made over a wide temperature range. These data can be used to determine the required level of thermal control on the DARE spacecraft. This work has been carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We also acknowledge support from the Lunar University Network for Astrophysical Research (LUNAR). The LUNAR consortium has been funded by the NASA Lunar Science Institute to investigate concepts for astrophysical observatories on the Moon via cooperative agreement NNA09DB30A.

  5. Energy and spectrum efficiency in rural areas based on cognitive radio technology

    CSIR Research Space (South Africa)

    Masonta, MT

    2009-09-01

    Full Text Available The rapid growth and development observed in wireless communications has resulted in the overcrowding of the radio spectrum used as a communication medium in wireless networks. In many countries, governmental agencies regulate the use of the radio...

  6. Radio Frequency Identification (RFID) and communication technologies for solid waste bin and truck monitoring system.

    Science.gov (United States)

    Hannan, M A; Arebey, Maher; Begum, R A; Basri, Hassan

    2011-12-01

    This paper deals with a system of integration of Radio Frequency Identification (RFID) and communication technologies for solid waste bin and truck monitoring system. RFID, GPS, GPRS and GIS along with camera technologies have been integrated and developed the bin and truck intelligent monitoring system. A new kind of integrated theoretical framework, hardware architecture and interface algorithm has been introduced between the technologies for the successful implementation of the proposed system. In this system, bin and truck database have been developed such a way that the information of bin and truck ID, date and time of waste collection, bin status, amount of waste and bin and truck GPS coordinates etc. are complied and stored for monitoring and management activities. The results showed that the real-time image processing, histogram analysis, waste estimation and other bin information have been displayed in the GUI of the monitoring system. The real-time test and experimental results showed that the performance of the developed system was stable and satisfied the monitoring system with high practicability and validity.

  7. Space Telecommunications Radio System STRS Cognitive Radio

    Science.gov (United States)

    Briones, Janette C.; Handler, Louis M.

    2013-01-01

    Radios today are evolving from awareness toward cognition. A software defined radio (SDR) provides the most capability for integrating autonomic decision making ability and allows the incremental evolution toward a cognitive radio. This cognitive radio technology will impact NASA space communications in areas such as spectrum utilization, interoperability, network operations, and radio resource management over a wide range of operating conditions. NASAs cognitive radio will build upon the infrastructure being developed by Space Telecommunication Radio System (STRS) SDR technology. This paper explores the feasibility of inserting cognitive capabilities in the NASA STRS architecture and the interfaces between the cognitive engine and the STRS radio. The STRS architecture defines methods that can inform the cognitive engine about the radio environment so that the cognitive engine can learn autonomously from experience, and take appropriate actions to adapt the radio operating characteristics and optimize performance.

  8. Strategies for improvement of spectrum capacity for WiMax cellular systems by Cognitive Radio Technology supported by Relay Stations

    DEFF Research Database (Denmark)

    Frederiksen, Flemming Bjerge; Prasad, Ramjee

    2007-01-01

    Methods to enhance the use of the frequency spectrum by automatical spectrum sensing plus spectrum sharing in a cognitive radio technology context will be presented and discussed in this paper. Ideas to improve the wireless transmission by orthogonal OFDM-based communication and to increase the c...

  9. Strategies for improvement of spectrum capacity for WiMax cellular systems by Cognitive Radio Technology supported by Relay Stations

    DEFF Research Database (Denmark)

    Frederiksen, Flemming Bjerge; Prasad, Ramjee

    2007-01-01

    Methods to enhance the use of the frequency spectrum by automatical spectrum sensing plus spectrum sharing in a cognitive radio technology context will be presented and discussed in this paper. Ideas to improve the wireless transmission by orthogonal OFDM-based communication and to increase...

  10. Improving Spectral Capacity and Wireless Network Coverage by Cognitive Radio Technology and Relay Nodes in Cellular Systems

    DEFF Research Database (Denmark)

    Frederiksen, Flemming Bjerge

    2008-01-01

    Methods to enhance the use of the frequency spectrum by automatical spectrum sensing plus spectrum sharing in a cognitive radio technology context have been presented and discussed in this paper. Ideas to improve the wireless transmission by orthogonal OFDM-based communication and to increase...

  11. Does Wearable Medical Technology With Video Recording Capability Add Value to On-Call Surgical Evaluations?

    Science.gov (United States)

    Gupta, Sameer; Boehme, Jacqueline; Manser, Kelly; Dewar, Jannine; Miller, Amie; Siddiqui, Gina; Schwaitzberg, Steven D

    2016-10-01

    Background Google Glass has been used in a variety of medical settings with promising results. We explored the use and potential value of an asynchronous, near-real time protocol-which avoids transmission issues associated with real-time applications-for recording, uploading, and viewing of high-definition (HD) visual media in the emergency department (ED) to facilitate remote surgical consults. Study Design First-responder physician assistants captured pertinent aspects of the physical examination and diagnostic imaging using Google Glass' HD video or high-resolution photographs. This visual media were then securely uploaded to the study website. The surgical consultation then proceeded over the phone in the usual fashion and a clinical decision was made. The surgeon then accessed the study website to review the uploaded video. This was followed by a questionnaire regarding how the additional data impacted the consultation. Results The management plan changed in 24% (11) of cases after surgeons viewed the video. Five of these plans involved decision making regarding operative intervention. Although surgeons were generally confident in their initial management plan, confidence scores increased further in 44% (20) of cases. In addition, we surveyed 276 ED patients on their opinions regarding concerning the practice of health care providers wearing and using recording devices in the ED. The survey results revealed that the majority of patients are amenable to the addition of wearable technology with video functionality to their care. Conclusions This study demonstrates the potential value of a medically dedicated, hands-free, HD recording device with internet connectivity in facilitating remote surgical consultation.

  12. Resilient backhaul network design using hybrid radio/free-space optical technology

    KAUST Repository

    Douik, Ahmed

    2016-07-26

    The radio-frequency (RF) technology is a scalable solution for the backhaul planning. However, its performance is limited in terms of data rate and latency. Free Space Optical (FSO) backhaul, on the other hand, offers a higher data rate but is sensitive to weather conditions. To combine the advantages of RF and FSO backhauls, this paper proposes a cost-efficient backhaul network using the hybrid RF/FSO technology. To ensure a resilient backhaul, the paper imposes a given degree of redundancy by connecting each node through K link-disjoint paths so as to cope with potential link failures. Hence, the network planning problem considered in this paper is the one of minimizing the total deployment cost by choosing the appropriate link type, i.e., either hybrid RF/FSO or optical fiber (OF), between each couple of base-stations while guaranteeing K link-disjoint connections, a data rate target, and a reliability threshold. The paper solves the problem using graph theory techniques. It reformulates the problem as a maximum weight clique problem in the planning graph, under a specified realistic assumption about the cost of OF and hybrid RF/FSO links. Simulation results show the cost of the different planning and suggest that the proposed heuristic solution has a close-to-optimal performance for a significant gain in computation complexity. © 2016 IEEE.

  13. Impact of Radio-Frequency Identification (RFID) Technologies on the Hospital Supply Chain: A Literature Review

    Science.gov (United States)

    Coustasse, Alberto; Tomblin, Shane; Slack, Chelsea

    2013-01-01

    Supply costs account for more than one-third of the average operating budget and constitute the second largest expenditure in hospitals. As hospitals have sought to reduce these costs, radio-frequency identification (RFID) technology has emerged as a solution. This study reviews existing literature to gauge the recent and potential impact and direction of the implementation of RFID in the hospital supply chain to determine current benefits and barriers of adoption. Findings show that the application of RFID to medical equipment and supplies tracking has resulted in efficiency increases in hospitals with lower costs and increased service quality. RFID technology can reduce costs, improve patient safety, and improve supply chain management effectiveness by increasing the ability to track and locate equipment, as well as monitoring theft prevention, distribution management, and patient billing. Despite ongoing RFID implementation in the hospital supply chain, barriers to widespread and rapid adoption include significant total expenditures, unclear return on investment, and competition with other strategic imperatives. PMID:24159272

  14. Power supply and impedance matching to drive technological radio-frequency plasmas with customized voltage waveforms.

    Science.gov (United States)

    Franek, James; Brandt, Steven; Berger, Birk; Liese, Martin; Barthel, Matthias; Schüngel, Edmund; Schulze, Julian

    2015-05-01

    We present a novel radio-frequency (RF) power supply and impedance matching to drive technological plasmas with customized voltage waveforms. It is based on a system of phase-locked RF generators that output single frequency voltage waveforms corresponding to multiple consecutive harmonics of a fundamental frequency. These signals are matched individually and combined to drive a RF plasma. Electrical filters are used to prevent parasitic interactions between the matching branches. By adjusting the harmonics' phases and voltage amplitudes individually, any voltage waveform can be approximated as a customized finite Fourier series. This RF supply system is easily adaptable to any technological plasma for industrial applications and allows the commercial utilization of process optimization based on voltage waveform tailoring for the first time. Here, this system is tested on a capacitive discharge based on three consecutive harmonics of 13.56 MHz. According to the Electrical Asymmetry Effect, tuning the phases between the applied harmonics results in an electrical control of the DC self-bias and the mean ion energy at almost constant ion flux. A comparison with the reference case of an electrically asymmetric dual-frequency discharge reveals that the control range of the mean ion energy can be significantly enlarged by using more than two consecutive harmonics.

  15. Novel technology for the the Effelsberg 100-m Radio Telescope and MeerKAT

    Science.gov (United States)

    Kramer, Michael; Kraus, Alex; Wieching, Gundolf

    2015-08-01

    The 100-m radio telescope of the Max-Planck-Institut für Radioastronomie (MPIfR) is a unique European astronomical facility that combines superb sensitivity and wide frequency coverage (300 MHz - 95 GHz) with distinct versatility, making the telescope not only a cutting edge instrument for front-line research but also a testbed for emerging and future technology.Even more than 40 years old, the telescope has been continuously modernized and is heavily involved in various kinds of astronomical research as stand-alone instrument as well as in several VLBI networks. Currently, a large upgrade of the receiver suite at the telescope is ongoing. Several new, state-of-the-are broad-band receivers have been installed recently or are under constructions. Along with the new receivers, modern digital backends are being designed. We report on the current status of these upgrades by presenting some „highlights" and giving an outlook on the activities planned for the future.The technology developed and tested during these upgrades also finds application in the MeerKAT observatory in South Africa. MeerKAT is a fully funded radio observatory under construction in the Northern Cape of South Africa. When complete, MeerKAT’s 64 13.5-m dishes will form the - by far - most sensitive telescope in the Southern hemisphere, being equivalent to a 110 m dish. Due to the dish design with an offset Gregorian feed it will be 60%more sensitive than large center feed single dishes of comparable size.MPIfR is designing and constructing a 1.75- 3.44 GHz Receiver system for MeerKAT. The receiver will allow observations at a frequency range at currently unavailable sensitivity and spatial resolution in the Southern hemisphere. Combined with its powerful MPIfR Pulsar search backend it is expected to detect more than 1600 normal and 270 millisecond pulsars. In addition MeerKat will open up science that stays for its own but also prepares future observations with SKA and complements future SKA

  16. Back to the future: science and technology directions for radio telescopes of the twenty-first century

    Science.gov (United States)

    Cordes, James M.

    2009-08-01

    The early days of radio astronomy showed incredibly diverse experimentation in ways to sample the electromagnetic spectrum at radio wavelengths. In addition to obtaining adequate sensitivity by building large collection areas, a primary goal also was to achieve sufficient angular resolution to localize radio sources for multi-wavelength identification. This led to many creative designs and the invention of aperture synthesis and VLBI. Some of the basic telescope types remain to the present day, now implemented across the entire radio spectrum from wavelengths of tens of meters to submillimeter wavelengths. In recent years, as always, there is still the drive for greater sensitivity but a primary goal is now to achieve very large fields of view to complement high resolution and frequency coverage, leading to a new phase of experimentation. This is the “back to the future” aspect of current research and development for next-generation radio telescopes. In this paper I summarize the scientific motivations for development of new technology and telescopes since about 1990 and going forward for the next decade and longer. Relevant elements include highly optimized telescope optics and feed antenna designs, innovative fabrication methods for large reflectors and dipole arrays, digital implementations, and hardware vs. software processing. The emphasis will be on meter and centimeter wavelength telescopes but I include a brief discussion of millimeter wavelengths to put the longer wavelength enterprises into perspective. I do not discuss submillimeter wavelengths because they are covered in other papers.

  17. Probing the sky with radio waves from wireless technology to the development of atmospheric science

    CERN Document Server

    Yeang, Chen-Pang

    2013-01-01

    By the late nineteenth century, engineers and experimental scientists generally knew how radio waves behaved, and by 1901 scientists were able to manipulate them to transmit messages across long distances. What no one could understand, however, was why radio waves followed the curvature of the Earth. Theorists puzzled over this for nearly twenty years before physicists confirmed the zig-zag theory, a solution that led to the discovery of a layer in the Earth's upper atmosphere that bounces radio waves earthward-the ionosphere. In Probing the Sky with Radio Waves,

  18. Applications for radio-frequency identification technology in the perioperative setting.

    Science.gov (United States)

    Zhao, Tiyu; Zhang, Xiaoxiang; Zeng, Lili; Xia, Shuyan; Hinton, Antentor Othrell; Li, Xiuyun

    2014-06-01

    We implemented a two-year project to develop a security-gated management system for the perioperative setting using radio-frequency identification (RFID) technology to enhance the management efficiency of the OR. We installed RFID readers beside the entrances to the OR and changing areas to receive and process signals from the RFID tags that we sewed into surgical scrub attire and shoes. The system also required integrating automatic access control panels, computerized lockers, light-emitting diode (LED) information screens, wireless networks, and an information system. By doing this, we are able to control the flow of personnel and materials more effectively, reduce OR costs, optimize the registration and attire-changing process for personnel, and improve management efficiency. We also anticipate this system will improve patient safety by reducing the risk of surgical site infection. Application of security-gated management systems is an important and effective way to help ensure a clean, convenient, and safe management process to manage costs in the perioperative area and promote patient safety. Copyright © 2014 AORN, Inc. Published by Elsevier Inc. All rights reserved.

  19. A Stretchable Radio-Frequency Strain Sensor Using Screen Printing Technology

    Directory of Open Access Journals (Sweden)

    Heijun Jeong

    2016-11-01

    Full Text Available In this paper, we propose a stretchable radio-frequency (RF strain sensor fabricated with screen printing technology. The RF sensor is designed using a half-wavelength patch that resonates at 3.7 GHz. The resonant frequency is determined by the length of the patch, and it therefore changes when the patch is stretched. Polydimethylsiloxane (PDMS is used to create the substrate, because of its stretchable and screen-printable surface. In addition, Dupont PE872 (Dupont, NC, American silver conductive ink is used to create the stretchable conductive patterns. The sensor performance is demonstrated both with full-wave simulations and with measurements carried out on a fabricated sample. When the length of the patch sensor is increased by a 7.8% stretch, the resonant frequency decreases from 3.7 GHz to 3.43 GHz, evidencing a sensitivity of 3.43 × 107 Hz/%. Stretching the patch along its width does not change the resonant frequency.

  20. The potential implementation of radio-frequency identification technology for personal health examination and monitoring.

    Science.gov (United States)

    Nguyen, Andrew

    2009-11-16

    This paper presents several possible applications of the radio-frequency identification (RFID) technology for personal health examination and monitoring. One application involves using RFID sensors external to the human body, while another one uses both internal and external RFID sensors. Another application involves simultaneous assessment and monitoring of many patients in a hospital setting using networks of RFID sensors. All the assessment and monitoring are done wirelessly, either continuously or periodically in any interval, in which the sensors collect information on human parts such as the lungs or heart and transmit this information to a router, PC or PDA device connected to the internet, from which patient's condition can be diagnosed and viewed by authorized medical professionals in remote locations. Instantaneous information allows medical professionals to intervene properly and in a timely fashion to prevent possible catastrophic effects to patients. The continuously assessed and monitored information provides medical professionals with more complete and long-term studies of patients. The proposed ideas promise to result in not only enhancement of the health treatment quality but also in significant reduction of medical expenditure.

  1. 物联网无线技术分析及相关商业应用%Radio Communication Technology and Related Business Applications of Internet of Things

    Institute of Scientific and Technical Information of China (English)

    周明; 司文

    2015-01-01

    Radio communication technology is the core of Internet of things . It includes radio frequency technology ,NFC technology ,Infrared technology ,Wifi technology ,Bluetooth and ZigBee . T his paper analyzes technical characteristics and commercial prospects of these technologies .%无线传输技术是物联网技术的核心。本文以无线射频技术、NFC技术、红外技术、Wifi技术、蓝牙技术、ZigBee技术为切入点,分析了它们的技术特点及在物联网应用中的商业前景。

  2. Radio Monitoring System Based on Software-Defined Radio and Cloud Technology%基于软件无线电和云计算技术的无线电监管体系

    Institute of Scientific and Technical Information of China (English)

    叶永平

    2012-01-01

    文章提出了运用软件无线电、有线及无线高速网络、云计算等技术等3项新技术相结合的全新的无线电监测系统的设想、框架及应用模式,一改传统无线电监测基础思想和模式,为新一代的无线电监管技术及体系的发展提供参考.%This paper describes a new radio monitoring system that is different to traditional radio monitoring systems. In this paper, the architecture and application model are discussed. The radio monitoring system combines software-defined radio (SDR), wired and wireless high-speed network, and cloud computing technotogies. It is a reference for new-generation radio monitoring technology and system development.

  3. A call center primer.

    Science.gov (United States)

    Durr, W

    1998-01-01

    Call centers are strategically and tactically important to many industries, including the healthcare industry. Call centers play a key role in acquiring and retaining customers. The ability to deliver high-quality and timely customer service without much expense is the basis for the proliferation and expansion of call centers. Call centers are unique blends of people and technology, where performance indicates combining appropriate technology tools with sound management practices built on key operational data. While the technology is fascinating, the people working in call centers and the skill of the management team ultimately make a difference to their companies.

  4. Detection of erosion/deposition depth using a low frequency passive Radio Frequency Identification (RFID) technology

    Science.gov (United States)

    Moustakidis, Iordanis Vlasios

    This thesis presents an experimental study both in the laboratory and field to develop and test a method for continuously measuring and monitoring scour using an automated identification technology known as Radio Frequency Identification (RFID). RFID systems consist of three main components, namely (a) the reader which controls the system, (b) the transponder (derived from transmitter/responder) that transmits data to the reader and (c) the excitation antenna that allows the communication between the reader and the transponder. The study provides an insight into the RFID technology and develops the framework for using this technology to eventually address two central themes in river mechanics and sediment transport; (a) the determination of the active layer thickness and (b) the scour/deposition depth around a hydraulic structure. In particular, this study develops the methodology for relating the signal strength of a radio frequency (RF) device with the distance between an excitation antenna and the RF device. The experiments presented herein are classified into two main groups, (1) the laboratory and (2) the RF signal vs. the detection distance experiments (field experiments). The laboratory experiments were designed to understand the effect of key RFID parameters (e.g., transponder orientation with respect to the excitation antenna plane, maximum antenna-transponder detection distance), measured in terms of the transponder return RF signal strength for various antenna-transponder distances, transponder orientations with respect to the excitation antenna plane and different mediums in between the excitation antenna and the transponder, on the overall performance of the RFID system. On the other hand, the RF signal vs. the detection distance experiments were based on the results obtained during the laboratory experiments and focused on developing calibration curves by relating the transponder return RF signal strength with the distance between the excitation

  5. Enhancing GNU Radio for Hardware Accelerated Radio Design

    OpenAIRE

    Irick, Charles Robert

    2010-01-01

    As technology evolves and new methods for designing radios arise, it becomes necessary to continue the search for fast and flexible development environments. Some of these new technologies include software defined radio (SDR), Field Programmable Gate Arrays (FPGAs), and the open source project GNU Radio. Software defined radio is a concept that GNU Radio has harnessed to allow developers to quickly create flexible radio designs. In terms of hardware, the maturity of FPGAs give ...

  6. Technology of Digital Radio Broadcasting%数字无线电广播技术探讨

    Institute of Scientific and Technical Information of China (English)

    薛虎

    2015-01-01

    随着我国音频广播的不断发展与创新,无线电技术被广泛应用于其中,发挥了很重要的作用.目前,我国的数字无线电广播技术尚未成熟,仍需要进一步地研究发展,以此满足人类的需要.文章主要对数字的无线电广播技术进行探讨分析,并对出现的问题提出解决措施.%With the continuous development and innovation of audio broadcasts, radio technology is widely used which has played a very important role. At present, China's digital radio technology is not yet mature, still requires further research and development, in order to meet human needs. This paper mainly for digital radio broadcasting technologies to explore analysis, and propose solutions arise.

  7. Infections onboard ship--analysis of 1290 advice calls to the Radio Medical (RM) doctor in Sweden. Results from 1997, 2002, 2007, and 2009.

    Science.gov (United States)

    Westlund, Karin

    2011-01-01

    Results from a descriptive study on Swedish Telemedical Advice Services (TMAS) from 1997, 2002, 2007, and the first six months of 2009 on infectious conditions are presented. These findings concern symptoms, actions taken, number of evacuations, means of communication, and use of digital photos. They show that infectious conditions are a significant contributor to calls to the service and that they can be more frequently treated on board than can other conditions.

  8. Resonance and Radio

    Science.gov (United States)

    Starrett, Malin J.

    2008-01-01

    The science and technology of radio receives little attention in contemporary education. This article discusses ways to explore the basic operating principles of radio. (Contains 4 figures, 3 footnotes, and 2 notes.)

  9. Coverage Range and Cost Comparison of Remote Antenna Unit Designs for In-building Radio over Fiber Technology

    Directory of Open Access Journals (Sweden)

    Razali Ngah

    2008-05-01

    Full Text Available Future communication needs to be ubiquitous, broadband, convergent, and seamless. Radio over fiber (RoF technology is one of the most important enabler in access network for the technologies. Adoption of RoF faces bottleneck in optoelectronics, that they are still expensive, high power consumption, and limited in bandwidth. To solve the problem, transceiver in remote antenna unit (RAU is developed, i.e. electroabsorption transceiver (EAT and asymmetric Fabry-Perot modulator (AFPM. This paper compares their coverage range and cost in providing WCDMA and WLAN services. Needed gain of RF amplifier for supporting picocell is also discussed.

  10. Applications of software-defined radio (SDR) technology in hospital environments.

    Science.gov (United States)

    Chávez-Santiago, Raúl; Mateska, Aleksandra; Chomu, Konstantin; Gavrilovska, Liljana; Balasingham, Ilangko

    2013-01-01

    A software-defined radio (SDR) is a radio communication system where the major part of its functionality is implemented by means of software in a personal computer or embedded system. Such a design paradigm has the major advantage of producing devices that can receive and transmit widely different radio protocols based solely on the software used. This flexibility opens several application opportunities in hospital environments, where a large number of wired and wireless electronic devices must coexist in confined areas like operating rooms and intensive care units. This paper outlines some possible applications in the 2360-2500 MHz frequency band. These applications include the integration of wireless medical devices in a common communication platform for seamless interoperability, and cognitive radio (CR) for body area networks (BANs) and wireless sensor networks (WSNs) for medical environmental surveillance. The description of a proof-of-concept CR prototype is also presented.

  11. Programmable Ultra Lightweight System Adaptable Radio (PULSAR) Low Cost Telemetry - Access from Space Advanced Technologies or Down the Middle

    Science.gov (United States)

    Sims. Herb; Varnavas, Kosta; Eberly, Eric

    2013-01-01

    Software Defined Radio (SDR) technology has been proven in the commercial sector since the early 1990's. Today's rapid advancement in mobile telephone reliability and power management capabilities exemplifies the effectiveness of the SDR technology for the modern communications market. In contrast, presently qualified satellite transponder applications were developed during the early 1960's space program. Programmable Ultra Lightweight System Adaptable Radio (PULSAR, NASA-MSFC SDR) technology revolutionizes satellite transponder technology by increasing data through-put capability by, at least, an order of magnitude. PULSAR leverages existing Marshall Space Flight Center SDR designs and commercially enhanced capabilities to provide a path to a radiation tolerant SDR transponder. These innovations will (1) reduce the cost of NASA Low Earth Orbit (LEO) and Deep Space transponders, (2) decrease power requirements, and (3) a commensurate volume reduction. Also, PULSAR increases flexibility to implement multiple transponder types by utilizing the same hardware with altered logic - no analog hardware change is required - all of which can be accomplished in orbit. This provides high capability, low cost, transponders to programs of all sizes. The final project outcome would be the introduction of a Technology Readiness Level (TRL) 7 low-cost CubeSat to SmallSat telemetry system into the NASA Portfolio.

  12. Technology Evaluation of Programmable Communicating Thermostats with Radio Broadcast Data System Communications

    Energy Technology Data Exchange (ETDEWEB)

    Herter, Karen; Wayland, Seth

    2008-10-31

    Programmable Communicating Thermostats are thermostats that can be programmed by the user to respond to signals indicating a grid-level system emergency or pricing event. The California Energy Commission is considering standards that would include a requirement for Programmable Communicating Thermostats in residential and small commercial applications. The current specification for Programmable Communicating Thermostats requires Radio Data System communications to Programmable Communicating Thermostats. This study tested the signal strength and reliability of Radio Data System signals at 40 customer sites within the Sacramento Municipal Utility District, which is serviced by 17 radio stations that already transmit Radio Data System signals. The study also tested the functionality of a commercially available Programmable Communicating Thermostat for compliance with California Energy Commission design standards. Test results demonstrated that Radio Data System is capable of reliably sending price and emergency signals. This study also provides evidence that existing Programmable Communicating Thermostats, on receiving a Radio Data System pricing or event signal, are capable of automatically increasing set points to a customer-determined or utility-determined level, thus providing air-conditioning demand response within seconds or just a few (less than 5) minutes.

  13. A technique for measurement of earth station antenna G/T by radio stars and Applications Technology Satellites.

    Science.gov (United States)

    Kochevar, H. J.

    1972-01-01

    A new technique has been developed to accurately measure the G/T of a small aperture antenna using geostationary satellites and the well established radio star method. A large aperture antenna having the capability of accurately measuring its G/T by using a radio star of known power density is used to obtain an accurate G/T to use as a reference. The CNR of both the large and small aperture antennas are then measured using an Applications Technology Satellite (ATS). After normalizing the two C/N ratios to the large antenna system noise temperature the G/T or the gain G of the small aperture antenna can then be determined.

  14. Broadcasting studios Radio Bremen becomes residence rehabilitation clinic. Energy efficient retrofitting with economic building services technology; Funkhaus Radio Bremen wird Residenz Reha-Klinik. Energieeffiziente Sanierung mit wirtschaftlicher Gebaeudetechnik

    Energy Technology Data Exchange (ETDEWEB)

    Hinz, Thomas [Siemens AG, Bremen (Germany). Building Technologies Div.

    2012-07-01

    Hardly any building project is as sustainable as the rededication of a building. A recent example: The former site of Radio Bremen in the district Schwachhausen with approximately 10,000 square meters of studios, production facilities and offices were committed to the residence rehabilitation clinic with 200 beds and 100 outpatient rehab places. In order to support the economic efficiency of this measure, the existing infrastructure of the heating technology, ventilation technology and air conditioning technology was adopted and modernized.

  15. Radio electric asymmetric conveyer (REAC: A novel neuromodulation technology in Alzheimer’s and other neurodegenerative diseases

    Directory of Open Access Journals (Sweden)

    Salvatore eRinaldi

    2015-02-01

    Full Text Available Global research in the field of pharmacology has not yet found effective drugs to treat Alzheimer's disease. Thus, alternative therapeutic strategies are under investigation, such as neurostimulation by physical means. Radio electric asymmetric conveyer (REAC is one of these technologies and has, until now, been used in clinical studies on several psychiatric and neurological disorders with encouraging results in the absence of side effects. Moreover, studies at the cellular level have shown that REAC technology, with the appropriate protocols, is able to induce neuronal differentiation both in murine embryonic cells and in human adult differentiated cells. Other studies have shown that REAC technology is able to positively influence senescence processes. Studies conducted on Alzheimer's disease (AD patients and in transgenic mouse models have shown promising results, suggesting REAC could be a useful therapy for certain components of AD.

  16. Using IP as Transport Technology in Third Generation and Beyond Radio Access Networks

    NARCIS (Netherlands)

    Bader, Attila; Westberg, Lars; Karagiannis, Georgios; de Meer, H; Bhatti, N.T.

    This paper discusses the motivation for developing a new QoS signaling protocol for IP-based Radio Access Networks. It describes the main characteristics of these networks and the special requirements imposed by these characteristics on QoS signaling solutions.

  17. The use of radio telemetry in Martes research: techniques and technologies

    Science.gov (United States)

    Craig M. Thompson; Rebecca A. Green; Joel Sauder; Kathryn L. Purcell; Richard Sweitzer; Jon. Armeno

    2012-01-01

    Radiotelemetry was fi rst used on a Martes species in 1972, when 5 American martens ( Martes americana ) captured incidentally during a snowshoe hare ( Lepus americanus ) research project in Minnesota were radio-collared. Since then, at least 128 research projects have used radiotelemetry to investigate...

  18. Radio tagging technology reveals extreme nest drifting behavior in a eusocial insect

    DEFF Research Database (Denmark)

    Sumner, Seirian; Lucas, Eric; Barker, Jessie

    2007-01-01

    is less closely related. Here we reveal nest drifting as a strategy by which workers may maximize their indirect fitness by helping on several related nests, preferring those where the marginal return from their help is greatest. By using a novel monitoring technique, radio frequency identification (RFID...

  19. Enabling technologies for millimeter-wave radio-over-fiber systems in next generation heterogeneous mobile access networks

    Science.gov (United States)

    Zhang, Junwen; Yu, Jianjun; Wang, Jing; Xu, Mu; Cheng, Lin; Lu, Feng; Shen, Shuyi; Yan, Yan; Cho, Hyunwoo; Guidotti, Daniel; Chang, Gee-kung

    2017-01-01

    Fifth-generation (5G) wireless access network promises to support higher access data rate with more than 1,000 times capacity with respect to current long-term evolution (LTE) systems. New radio-access-technologies (RATs) based on higher carrier frequencies to millimeter-wave (MMW) radio-over-fiber, and carrier-aggregation (CA) using multi-band resources are intensively studied to support the high data rate access and effectively use of frequency resources in heterogeneous mobile network (Het-Net). In this paper, we investigate several enabling technologies for MMW RoF systems in 5G Het-Net. Efficient mobile fronthaul (MFH) solutions for 5G centralized radio access network (C-RAN) and beyond are proposed, analyzed and experimentally demonstrated based on the analog scheme. Digital predistortion based on memory polynomial for analog MFH linearization are presented with improved EVM performances and receiver sensitivity. We also propose and experimentally demonstrate a novel inter-/intra- RAT CA scheme for 5G Het- Net. The real-time standard 4G-LTE signal is carrier-aggregated with three broadband 60GHz MMW signals based on proposed optical-domain band-mapping method. RATs based on new waveforms have also been studied here to achieve higher spectral-efficiency (SE) in asynchronous environments. Full-duplex asynchronous quasi-gapless carrier aggregation scheme for MMW ROF inter-/intra-RAT based on the FBMC is also presented with 4G-LTE signals. Compared with OFDM-based signals with large guard-bands, FBMC achieves higher spectral-efficiency with better EVM performance at less received power and smaller guard-bands.

  20. INFLUENCE OF CONSTRUCTIVE AND TECHNOLOGICAL DEFECTS ON COAXIAL RADIO-FREQUENCY CABLE IMPEDANCE

    Directory of Open Access Journals (Sweden)

    G.V. Bezprozvannych

    2013-04-01

    Full Text Available Coaxial user's radio-frequency cables belong to a category of cable television network elements parameters of which essentially specify the system capabilities as a whole. The cable working frequency spectrum spreading to 1000 MHz along with digital television and soundtrack signals transmission and high-definition television introduction causes more rigid requirements for wave impedance and, consequently, for the cable design. The established norms on user's cable impedance deviations fail to answer the state-of-the-art requirements for granting a complex of interactive services. On the basis of calculations performed, values of internal and external conductor diameters deviations as well as dielectric permeability of the insulation material are validated. For up-to-date user's radio-frequency cables, the impedance deviation from the normalized average value of 75 Ohm should not exceed ± 2 Ohm.

  1. Experimental approach for seeing through walls using Wi-Fi enabled software defined radio technology

    Directory of Open Access Journals (Sweden)

    Isaac Cushman

    2016-11-01

    Full Text Available Modern handheld target detection methods are typically restricted to line of sight (LOS techniques. The design of a new method to detect moving targets through non-transparent surfaces could greatly aid the safety of hazardous military and government operations. In this paper, we develop through-wall virtual imaging using Wi-Fi enabled software defined radio to see moving objects and their relative locations. We use LabVIEW and NI Universal Software Radio Peripheral (NI USRP2921 radios with Ettus Research LP0965 directive antennas devices to detect moving objects behind walls by sending and receiving a signal with respect to the USRP's location. Based on the signal-to-interference ratio of our signal (rather than the traditional signal-to-noise method, we could determine the target object behind the wall. The two major applications for this project are: detecting an active shooter that is standing on the other side of the wall and detecting abnormalities in the human body such as breast cancer with more sensitive antennas. Likewise, firefighters, law enforcement officers, and military men would find more practical purposes for the use of this system in their fields. We evaluate the proposed model using experimental results.

  2. Adaption of Cognitive Radio technology to low-cost and low-power wireless Personal Area Network devices

    DEFF Research Database (Denmark)

    Rohde, John; Toftegaard, Thomas Skjødeberg

    2011-01-01

    The application of wireless personal area network (WPAN) and simple point-to-point wireless communication devices has increased drastically both in private household and in our workspaces in general over the last decade. Combined with the fact that the total number of wireless devices and associa......The application of wireless personal area network (WPAN) and simple point-to-point wireless communication devices has increased drastically both in private household and in our workspaces in general over the last decade. Combined with the fact that the total number of wireless devices...... discusses the challenges associated with the implementation of highly reliable low-power WPAN networks for the future and the adaption of Cognitive Radio technology as a potential solution. A brief status on the maturity of CR technology will be presented as an integral part of this discussion....

  3. A Computational Method based on Radio Frequency Technologies for the Analysis of Accessibility of Disabled People in Sustainable Cities

    Directory of Open Access Journals (Sweden)

    Virgilio Gilart-Iglesias

    2015-11-01

    Full Text Available The sustainability strategy in urban spaces arises from reflecting on how to achieve a more habitable city and is materialized in a series of sustainable transformations aimed at humanizing different environments so that they can be used and enjoyed by everyone without exception and regardless of their ability. Modern communication technologies allow new opportunities to analyze efficiency in the use of urban spaces from several points of view: adequacy of facilities, usability, and social integration capabilities. The research presented in this paper proposes a method to perform an analysis of movement accessibility in sustainable cities based on radio frequency technologies and the ubiquitous computing possibilities of the new Internet of Things paradigm. The proposal can be deployed in both indoor and outdoor environments to check specific locations of a city. Finally, a case study in a controlled context has been simulated to validate the proposal as a pre-deployment step in urban environments.

  4. Development of an Interdisciplinary STEM Classroom Activity for Radio Receiver Technology

    Science.gov (United States)

    Davis, Kristina

    2015-01-01

    Introduction The development of a mini STEM-based classroom activity designed to integrate these two fields into one project for middle school aged students is presented here. This lesson involves small groups of students constructing a small AM radio receivers. The lesson surrounding the activity focuses on both the physical nature of electromagnetic and AC waves, circuit design, practical applications to AM radio broadcasting, and research applications of radio telescopes. These tools have shown a significant increase in the lesson's primary concept understanding among 6th grade students, as well as net positive STEM awareness and enthusiasm.Content The primary teaching point for the students to consider and learn during this lesson is 'How does scientific application influence engineering design, and vice versa?' The lesson surrounds the hands-on activity of having students construct their own AM radio receiver. Wave theory and the use of radio instruments for astronomy research are also taught in a traditional lecture format. The activity is designed to complement middle school curriculum, although it has been tested and found suitable for high school and older students as well as the general public.Evaluation and ImpactThe evaluation tool that used for the student groups in this project was a Fryer chart, which is a four panel chart with the main topic listed in the center and a single question in each of the four panels. The students are asked to answer the questions in the chart before and after they participate in the lesson activity, each time in a different colored pencil so that the scores can be given to each student before and after they participated in the activity. Student scores improved from 4.5 to 17.9 out of a total of 20 possible points. This is an overall increase of 67% of the total possible points. The questions asked on the quiz cover the range of wave theory, circuit design, and scientific explanation. This factor of improvement shows that

  5. Antenna Technology and other Radio Frequency (RF) Communications Activities at the Glenn Research Center in Support of NASA's Exploration Vision

    Science.gov (United States)

    Miranda, Felix A.

    2007-01-01

    NASA s Vision for Space Exploration outlines a very ambitious program for the next several decades of the Space Agency endeavors. Ahead is the completion of the International Space Station (ISS); safely flight the shuttle (STS) until 2010; develop and fly the Crew Exploration Vehicle (Orion) by no later than 2014; return to the moon by no later than 2020; extend human presence across the solar system and beyond; implement a sustainable and affordable human and robotic program; develop supporting innovative technologies, knowledge and infrastructure; and promote international and commercial participation in exploration. To achieve these goals, a series of enabling technologies must be developed or matured in a timely manner. Some of these technologies are: spacecraft RF technology (e.g., high power sources and large antennas which using surface receive arrays can get up to 1 Gbps from Mars), uplink arraying (reduce reliance on large ground-based antennas and high operation costs; single point of failure; enable greater data-rates or greater effective distance; scalable, evolvable, flexible scheduling), software define radio (i.e., reconfigurable, flexible interoperability allows for in flight updates open architecture; reduces mass, power, volume), and optical communications (high capacity communications with low mass/power required; significantly increases data rates for deep space). This presentation will discuss some of the work being performed at the NASA Glenn Research Center, Cleveland, Ohio, in antenna technology as well as other on-going RF communications efforts.

  6. Readiness of hospitals affiliated with Shiraz university of medical sciences for implementation of radio frequency identification technology

    Directory of Open Access Journals (Sweden)

    Saeid Ebrahimi

    2015-10-01

    Full Text Available Introduction: Applying information technology in healthcare system is one of the most important criteria of the World Health Organization for evaluating the quality of healthcare systems of different countries. Moreover, applying this technology in different parts of health care system can create great potentials for improving the quality of healthcare services. In this regard, Radio Frequency Identification (RFID technology is one of the most practical technologies in identifying and collecting data. The present study aimed to compare the readiness of Shiraz University of medical sciences hospitals for implementation of RFID system in 2014. Method: This was a cross-sectional study conducted in 2014. The research population consisted of 110 senior and middle managers. Due to the limited research population, census method was used. The research tool was a questionnaire prepared by the researcher to investigate the hospitals’ readiness for implementation of RFID technology. Face and content validity of the questionnaire were approved by the experts. Cronbach’s alpha test was run to determine the reliability of the questionnaire (data were considered significant at p <0.05. Also, the data were analyzed in SPSS software using descriptive statistics (mean, standard deviation, and percentage and inferential statistics (one-way ANOVA. Results: The study showed that the readiness level of the hospitals was moderate. Comparing the mean of the total readiness level in the hospitals under the study revealed that there was a statistically significant difference between hospital M and other hospitals (P=0.003. However, the total readiness of hospital I was higher than others. Conclusion: Among 13 hospitals under the study, the hospitals I and A were moderately ready and others were not ready for implementation of RFID technology. Thus, considering various applications and advantages of RFID technology, it is suggested that the hospitals should prepare

  7. 47 CFR 2.302 - Call signs.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 1 2010-10-01 2010-10-01 false Call signs. 2.302 Section 2.302... RULES AND REGULATIONS Call Signs and Other Forms of Identifying Radio Transmissions § 2.302 Call signs. The table which follows indicates the composition and blocks of international call signs available...

  8. Command and Control Related Computer Technology. Part I. Packet Radio. Part II. Speech Compression and Evaluation

    Science.gov (United States)

    1975-12-01

    Radio group has now assimilated the history and context of the project and has become an active and important member of the group. Resolution of...vii ^ i N - i .-.■ Si • ■ - %■ ’■:■ .". <- * ■ ’ . ■ ■ - v. .■’. parts, one for consonants and one for vowels . It is a nonsense...position, and the response set for each item is a minimal pair of English monosyllables. The Phoneme-Specific Intelligibi1ity test covers vowels

  9. Radiography of Spanish Radio

    Directory of Open Access Journals (Sweden)

    Dra. Emma Rodero Antón

    2007-01-01

    Full Text Available In its eighty years of existence, radio has been always characterized to adapt to the social, cultural and technological transformations. Thus it has been until this moment. Nevertheless, some years ago, the authors and professionals of this medium have been detecting a stagnation that affects to its structure. At a time in continuous technological evolution, radio demands a deep transformation. For that reason, from the conviction of which the future radio, public and commercial, will necessarily have to renew itself, in this paper we establish ten problems and their possible solutions to the radio crisis in order to draw an x-ray of radio in Spain. Radio has future, but it is necessary to work actively by it. That the radio continues being part of sound of our life, it will depend on the work of all: companies, advertisers, professionals, students, investigators and listeners.

  10. An investigation into the feasibility of locating portable medical devices using radio frequency identification devices and technology.

    Science.gov (United States)

    Britton, J

    2007-01-01

    Portable medical devices represent an important resource for assisting healthcare delivery. The movement of portable devices often results in them being unavailable when needed. Tracking equipment using radiofrequency identification technology/devices (RFID) may provide a promising solution to the problems encountered in locating portable equipment. An RFID technology trial was undertaken at Royal Alexandra Hospital, Paisley. This involved the temporary installation of three active readers and attaching actively transmitting radio frequency tags to different portable medical devices. The active readers and computer system were linked using a bespoke data network. Tags and readers from two separate manufacturers were tested. Reliability difficulties were encountered when testing the technology from the first manufacturer, probably due to the casing of the medical device interfering with the signal from the tag. Improved results were obtained when using equipment from the second manufacturer with an overall error rate of 12.3%. Tags from this manufacturer were specifically designed to overcome problems observed with the first system tested. Findings from this proof of concept trial suggest that RFID technology could be used to track the location of equipment in a hospital.

  11. New Methods of Stereo Encoding for FM Radio Broadcasting Based on Digital Technology

    Directory of Open Access Journals (Sweden)

    P. Stranak

    2007-12-01

    Full Text Available The article describes new methods of stereo encoding for FM radio broadcasting. Digital signal processing makes possible to construct an encoder with properties that are not attainable using conventional analog solutions. The article describes the mathematical model of the encoder, on the basis of which a specific program code for DSP was developed. The article further deals with a new method of composite clipping which does not cause impurities in the output spectrum, and at the same time preserves high separation between the left and right audio channels. The application of the new method is useful mainly where there are unwanted signal overshoots on the input of the stereo encoder, e.g., in case of signal transmission from the studio to the transmitter site through a route with psychoacoustic lossy compression of data rate.

  12. Evaluation of GNU Radio Platform Enhanced for Hardware Accelerated Radio Design

    OpenAIRE

    Karve, Mrudula Prabhakar

    2010-01-01

    The advent of software radio technology has enabled radio developers to design and imple- ment radios with great ease and flexibility. Software radios are effective in experimentation and development of radio designs. However, they have limitations when it comes to high- speed, high-throughput designs. This limitation can be overcome by introducing a hardware element to the software radio platform. Enhancing GNU Radio for Hardware Accelerated Radio Design project implements suc...

  13. Could the Pharmaceutical Industry Benefit from Full-Scale Adoption of Radio-Frequency Identification (RFID) Technology with New Regulations?

    Science.gov (United States)

    Coustasse, Alberto; Kimble, Craig A; Stanton, Robert B; Naylor, Mariah

    2016-01-01

    Healthcare regulators are directing attention to the pharmaceutical supply chain with the passage of the Drug Quality and Security Act (DQSA) and the Drug Supply Chain Security Act (DSCSA). Adoption of Radio-Frequency Identification (RFID) technology has the ability to improve compliance, reduce costs, and improve safety in the supply chain but its implementation has been limited; primarily because of hardware and tag costs. The purpose of this research study was to analyze the benefits to the pharmaceutical industry and healthcare system of the adoption of RFID technology as a result of newly implemented supply chain regulations. The methodology was a review following the steps of a systematic review with a total of 96 sources used. With the DSCSA, pharmaceutical companies must track and trace prescription drugs across the supply chain, and RFID can resolve many track-and-trace issues with manufacturer control of data. The practical implication of this study is that pharmaceutical companies must continue to have the potential to increase revenues, decrease associated costs, and increase compliance with new FDA regulations with RFID. Still, challenges related to regulatory statute wording, implementation of two-dimensional barcode technology, and the variety of interfaces within the pharmaceutical supply chain have delayed adoption and its full implementation.

  14. The Key Technology Research on Shipping Radio Telex Equipment Simulation%船舶Radio Telex设备仿真的关键技术研究

    Institute of Scientific and Technical Information of China (English)

    刘冰; 杨玉峰; 田云凯

    2009-01-01

    Radio Telex无线电传设备,是GMDSS地面通信系统的一种主要终端.文中介绍了以VisualC++6.0为工具开发GMDSS船舶Radio Telex仿真系统的两项关键技术:在Windows环境下利用MFC基于对话框的应用程序仿真设备在DOS环境下的键盘输入;运用局域网UDP协议仿真设备的电传通信过程.

  15. Just-in-Time Research: A Call to Arms for Research into Mobile Technologies in Higher Education

    Science.gov (United States)

    Byrne-Davis, Lucie; Dexter, Hilary; Hart, Jo; Cappelli, Tim; Byrne, Ged; Sampson, Ian; Mooney, Jane; Lumsden, Colin

    2015-01-01

    Mobile technologies are becoming commonplace in society and in education. In higher education, it is crucial to understand the impact of constant access to information on the development of the knowledge and competence of the learner. This study reports on a series of four surveys completed by UK-based medical students (n = 443) who received…

  16. The Current State of Music Education in Ghana: A call for integration of Information and Communication Technology (ICT.

    Directory of Open Access Journals (Sweden)

    Anthony Yaw Nyamful

    2016-04-01

    Full Text Available The essence of this paper is to identify the current situation of music education in Ghana at the basic, secondary and tertiary level of education and the extent to which Information and Communication Technology has been integrated to the demands of the modern music student in Ghana. After studying the programmes of tertiary music institutions and syllabuses of examinations for basic and secondary schools it was revealed that there has been little emphasis as regards Information and communication technology. Furthermore, an interview conducted among a sample of music students, music teachers and professional musicians which was made out of a population across the southern section of Ghana, revealed limited knowledge pertaining to Music Technology as part of teaching and learning of music. Considering the importance of the study of music, the author of this paper therefore seeks to postulate that, as a means of upgrading teaching and learning of music, the Ministry of Education should organize workshops and conferences for music teachers in the area of Information and Communication Technology and how it could be applied to enhance the teaching and learning of music.

  17. Language Tasks Using Touch Screen and Mobile Technologies: Reconceptualizing Task-Based CALL for Young Language Learners

    Science.gov (United States)

    Pellerin, Martine

    2014-01-01

    This article examines how the use of mobile technologies (iPods and tablets) in language classrooms contributes to redesigning task-based approaches for young language learners. The article is based on a collaborative action research (CAR) project in Early French Immersion classrooms in the province of Alberta, Canada. The data collection included…

  18. Emerging Radio and Manet Technology Study: Research Support for a Survey of State-of-the-art Commercial and Military Hardware/Software for Mobile Ad Hoc Networks

    Science.gov (United States)

    2014-10-01

    Emerging Radio and MANET Technology Study Research Support for a Survey of State-of-the-art Commercial and Military Hardware/Software...control (SA+C2) device that could be used by tactical units. This device would connect individual unit members through a mobile ad-hoc network ( MANET ...

  19. Radio frequency identification (RFID) technologies for locating warehouse resources: A conceptual framework

    OpenAIRE

    Hassan, M; M Ali; Aktas, E

    2012-01-01

    Copyright @ 2012 Information Technology Society In the supply chain, a warehouse is a crucial component for linking all chain parties. It is necessary to track the real time resource location and status to support warehouse operations effectively. Therefore, RFID technology has been adopted to facilitate the collection and sharing of data in a warehouse environment. However, an essential decision should be made on the type of RFID tags the warehouse managers should adopt, because it is ver...

  20. I've got a mobile phone too! Hard and soft assistive technology customization and supportive call centres for people with disability.

    Science.gov (United States)

    Darcy, Simon; Green, Jenny; Maxwell, Hazel

    2017-05-01

    The purpose of this article is to examine the use of a mobile technology platform, software customization and technical support services by people with disability. The disability experience is framed through the participants' use of the technology, their social participation. A qualitative and interpretive research design was employed using a three-stage process of observation and semi-structured interviews of people with disability, a significant other and their service provider. Transcripts were analyzed to examine the research questions through the theoretical framework of PHAATE - Policy, Human, Activity, Assistance and Technology and Environment. The analysis revealed three emergent themes: 1. Engagement and activity; 2. Training, support and customization; and 3. Enablers, barriers and attitudes. The findings indicate that for the majority of users, the mobile technology increased the participants' communication and social participation. However, this was not true for all members of the pilot with variations due to disability type, support needs and availability of support services. Most participants, significant others and service providers identified improvements in confidence, security, safety and independence of those involved. Yet, the actions and attitudes of some of the significant others and service providers acted as a constraint to the adoption of the technology. Implications for Rehabilitation Customized mobile technology can operate as assistive technology providing a distinct benefit in terms of promoting disability citizenship. Mobile technology used in conjunction with a supportive call centre can lead to improvements in confidence, safety and independence for people experiencing disability. Training and support are critical in increasing independent use of mobile technology for people with disability. The enjoyment, development of skills and empowerment gained through the use of mobile technology facilitate the social inclusion of people with

  1. Radio-tagging technology reveals extreme nest-drifting behavior in a eusocial insect.

    Science.gov (United States)

    Sumner, Seirian; Lucas, Eric; Barker, Jessie; Isaac, Nick

    2007-01-23

    Kin-selection theory underlies our basic understanding of social evolution [1, 2]. Nest drifting in eusocial insects (where workers move between nests) presents a challenge to this paradigm, since a worker should remain as a helper on her natal colony, rather than visit other colonies to which she is less closely related. Here we reveal nest drifting as a strategy by which workers may maximize their indirect fitness by helping on several related nests, preferring those where the marginal return from their help is greatest. By using a novel monitoring technique, radio frequency identification (RFID) tagging, we provide the first accurate estimate of drifting in a eusocial insect: 56% of females drifted in a natural population of the eusocial paper wasp Polistes canadensis, exceeding previous records of drifting in natural populations by more than 30-fold. We demonstrate that drifting cannot be explained through social parasitism, queen succession, mistakes in nest identity, or methodological bias. Instead, workers appear to gain indirect fitness benefits by helping on several related colonies in a viscous population structure. The potential importance of this strategy as a component of the kin-selected benefits for a social insect worker has previously been overlooked because of methodological difficulties in quantifying and studying drifting.

  2. NTRIP: Networked Transport of RTCM via Internet Protocol - Internet Radio Technology for Real-Time GNSS Purposes

    Science.gov (United States)

    Gebhard, H.; Weber, G.

    2003-12-01

    The massive worldwide growing of Internet capacity enables the introduction of new services such as Internet Radio or Internet Video-on-Demand, which transfer continuous data-streams by IP-packages. These services include the data transport via mobile IP-Networks like GSM, GPRS, EDGE, and UMTS where costs are nowadays rapidly decreasing. As a consequence, the global Internet can be used for the real-time collection and exchange of GNSS data, as well as for broadcasting derived differential products. Compared to Multimedia applications, the bandwidth required for streaming GNSS data is relatively small. The introduction of a real time streaming of GNSS data via Internet as a professional service is demanding with respect to network transparency, network security, program stability, access control, remote administration, scalability and client simplicity. This paper will discuss several possible technical/protocol solutions for streaming GNSS date over the Internet: Unicast vs. IP-Multicast, TCP vs. UDP, Client/Server vs. Client/Server/Splitter architecture. Based on this discussion, a novel HTTP-based technique for streaming GNSS data to mobile clients over the Internet is introduced. It allows simultaneous access of a large number of PDAs, Laptops, or GNSS receivers to a broadcasting host via Mobile IP-Networks. The technique establishes a format called "Networked Transport of RTCM via Internet Protocol" (NTRIP). NTRIP is designed for disseminating differential correction data (e.g. in the RTCM-104 format) or other kinds of GNSS streaming data.

  3. YOUR SELF CALLS YOU BACK IN ONE MOMENT. THE PRESSURE OF IT TECHNOLOGY TO THE IDENTITY AND SOCIAL BEHAVIOR.

    OpenAIRE

    Krzysztof Albin

    2009-01-01

    The article is focused on the problems of the interaction between Self, Self-concepts, Self-believes with IT objects. In reference to the views of Self by William James, Russell Belk, Hazel Markus and Alvin Toffler the research described below give the picture of change in Self structure among the Polish Internet users. The intensive impact between the Self-concepts and IT technology is still getting stronger. The most important results:1. Over 1/5 subjects, users of the mobile phone and Inte...

  4. Cognitive radio: aligning the regulatory environment with the technology, a business case perspective

    NARCIS (Netherlands)

    Anker, P.D.C.; Lemstra, W.

    2012-01-01

    This paper proposes to use the perspective of the business case to deal with the alignment between the introduction of new technology and the regulatory environment. Although this perspective can be used more generally this paper deals with this perspective in the context of the alignment between

  5. Improving the Quality and Cost of Healthcare Delivery: The Potential of Radio Frequency Identification (RFID) Technology

    Science.gov (United States)

    Vilamovska, Anna-Marie

    2010-01-01

    The study investigated whether an upcoming class of health information technology (HIT) can be used to address currently outstanding issues in the quality and cost of healthcare delivery. Expert interviews and a literature review were used to describe the 2009 universe of in- and outpatient healthcare RFID applications and to identify those…

  6. Improving the Quality and Cost of Healthcare Delivery: The Potential of Radio Frequency Identification (RFID) Technology

    Science.gov (United States)

    Vilamovska, Anna-Marie

    2010-01-01

    The study investigated whether an upcoming class of health information technology (HIT) can be used to address currently outstanding issues in the quality and cost of healthcare delivery. Expert interviews and a literature review were used to describe the 2009 universe of in- and outpatient healthcare RFID applications and to identify those…

  7. Effect of Radio Frequency Heating on Yoghurt, I: Technological Applicability, Shelf-Life and Sensorial Quality

    Science.gov (United States)

    Siefarth, Caroline; Tran, Thi Bich Thao; Mittermaier, Peter; Pfeiffer, Thomas; Buettner, Andrea

    2014-01-01

    This first part of a two-part study focuses on the technical feasibility of applying radio frequency (RF) heating at different temperatures (58, 65 and 72 °C) to a stirred yoghurt gel after culturing. For comparison, a convectional (CV) heating process was also applied. The aim was to increase the yoghurt shelf-life, by preventing post-acidification and the growth of yeasts and molds. At the same time, the viability of lactic acid bacteria (LAB) was investigated in view of existing legal regulations for yoghurts. Additionally, the yoghurt color, aroma and taste profiles were evaluated. It was found that the application of RF heating was effective for the rapid attainment of homogenous temperatures of 58 and 65 °C, respectively. For RF heating at 72 °C, it was not possible to establish a stable heating regime, since in some cases, there was significant overheating followed by strong contraction of the yoghurt curd and whey separation. Hence, it was decided not to continue with the RF heating series at 72 °C. In the case of CV heating, heat transfer limitations were observed, and prolonged heating was required. Nevertheless, we showed that yeasts and molds survived neither the RF nor CV heat treatment. LAB were found not to survive the CV treatment, but these beneficial microorganisms were still present in reduced numbers after RF heating to 58 and 65 °C. This important observation is most likely related to the mildness of RF treatment. While post-acidification was not observed on yoghurt storage, slight color changes occurred after heat treatment. The flavor and taste profiles were shown to be similar to the reference product. Furthermore, a trained sensory panel was not able to distinguish between, for example, the reference yoghurt and the RF 65 °C sample by triangular testing (α = 5%), showing the potential of novel strategies for further improvements of heat-treated yoghurt. PMID:28234322

  8. Thiamethoxam: Assessing flight activity of honeybees foraging on treated oilseed rape using radio frequency identification technology.

    Science.gov (United States)

    Thompson, Helen; Coulson, Mike; Ruddle, Natalie; Wilkins, Selwyn; Harkin, Sarah

    2016-02-01

    The present study was designed to assess homing behavior of bees foraging on winter oilseed rape grown from seed treated with thiamethoxam (as Cruiser OSR), with 1 field drilled with thiamethoxam-treated seed and 2 control fields drilled with fungicide-only-treated seed. Twelve honeybee colonies were used per treatment group, 4 each located at the field edge (on-field site), at approximately 500 m and 1000 m from the field. A total of nearly 300 newly emerged bees per colony were fitted (tagged) with Mic3 radio frequency identification (RFID) transponders and introduced into each of the 36 study hives. The RFID readers fitted to the entrances of the test colonies were used to monitor the activity of the tagged bees for the duration of the 5-wk flowering period of the crop. These activity data were analyzed to assess any impact on flight activity of bees foraging on the treated compared with untreated crops. Honeybees were seen to be actively foraging within all 3 treatment groups during the exposure period. The data for the more than 3000 RFID-tagged bees and more than 90 000 foraging flights monitored throughout the exposure phase for the study follow the same trends across the treatment and controls and at each of the 3 apiary distances, indicating that there were no effects from foraging on the treated crop. Under the experimental conditions, there was no effect of foraging on thiamethoxam-treated oilseed rape on honeybee flight activity or on their ability to return to the hive. © 2015 SETAC.

  9. Effect of Radio Frequency Heating on Yoghurt, I: Technological Applicability, Shelf-Life and Sensorial Quality

    Directory of Open Access Journals (Sweden)

    Caroline Siefarth

    2014-05-01

    Full Text Available This first part of a two-part study focuses on the technical feasibility of applying radio frequency (RF heating at different temperatures (58, 65 and 72 °C to a stirred yoghurt gel after culturing. For comparison, a convectional (CV heating process was also applied. The aim was to increase the yoghurt shelf-life, by preventing post-acidification and the growth of yeasts and molds. At the same time, the viability of lactic acid bacteria (LAB was investigated in view of existing legal regulations for yoghurts. Additionally, the yoghurt color, aroma and taste profiles were evaluated. It was found that the application of RF heating was effective for the rapid attainment of homogenous temperatures of 58 and 65 °C, respectively. For RF heating at 72 °C, it was not possible to establish a stable heating regime, since in some cases, there was significant overheating followed by strong contraction of the yoghurt curd and whey separation. Hence, it was decided not to continue with the RF heating series at 72 °C. In the case of CV heating, heat transfer limitations were observed, and prolonged heating was required. Nevertheless, we showed that yeasts and molds survived neither the RF nor CV heat treatment. LAB were found not to survive the CV treatment, but these beneficial microorganisms were still present in reduced numbers after RF heating to 58 and 65 °C. This important observation is most likely related to the mildness of RF treatment. While post-acidification was not observed on yoghurt storage, slight color changes occurred after heat treatment. The flavor and taste profiles were shown to be similar to the reference product. Furthermore, a trained sensory panel was not able to distinguish between, for example, the reference yoghurt and the RF 65 °C sample by triangular testing (α = 5%, showing the potential of novel strategies for further improvements of heat-treated yoghurt.

  10. Effect of Radio Frequency Heating on Yoghurt, I: Technological Applicability, Shelf-Life and Sensorial Quality.

    Science.gov (United States)

    Siefarth, Caroline; Tran, Thi Bich Thao; Mittermaier, Peter; Pfeiffer, Thomas; Buettner, Andrea

    2014-05-15

    This first part of a two-part study focuses on the technical feasibility of applying radio frequency (RF) heating at different temperatures (58, 65 and 72 °C) to a stirred yoghurt gel after culturing. For comparison, a convectional (CV) heating process was also applied. The aim was to increase the yoghurt shelf-life, by preventing post-acidification and the growth of yeasts and molds. At the same time, the viability of lactic acid bacteria (LAB) was investigated in view of existing legal regulations for yoghurts. Additionally, the yoghurt color, aroma and taste profiles were evaluated. It was found that the application of RF heating was effective for the rapid attainment of homogenous temperatures of 58 and 65 °C, respectively. For RF heating at 72 °C, it was not possible to establish a stable heating regime, since in some cases, there was significant overheating followed by strong contraction of the yoghurt curd and whey separation. Hence, it was decided not to continue with the RF heating series at 72 °C. In the case of CV heating, heat transfer limitations were observed, and prolonged heating was required. Nevertheless, we showed that yeasts and molds survived neither the RF nor CV heat treatment. LAB were found not to survive the CV treatment, but these beneficial microorganisms were still present in reduced numbers after RF heating to 58 and 65 °C. This important observation is most likely related to the mildness of RF treatment. While post-acidification was not observed on yoghurt storage, slight color changes occurred after heat treatment. The flavor and taste profiles were shown to be similar to the reference product. Furthermore, a trained sensory panel was not able to distinguish between, for example, the reference yoghurt and the RF 65 °C sample by triangular testing (α = 5%), showing the potential of novel strategies for further improvements of heat-treated yoghurt.

  11. Calling it what it is. Thesauri in the Flanders Heritage Agency: History, Importance, Use and Technological Advances

    Science.gov (United States)

    Mortier, S.; Van Daele, K.; Meganck, L.

    2017-08-01

    Heritage organizations in Flanders started using thesauri fairly recently compared to other countries. This paper starts with examining the historical use of thesauri and controlled vocabularies in computer systems by the Flemish Government dealing with immovable cultural heritage. Their evolution from simple, flat, controlled lists to actual thesauri with scope notes, hierarchical and equivalence relations and links to other thesauri will be discussed. An explanation will be provided for the evolution in our approach to controlled vocabularies, and how they radically changed querying and the way data is indexed in our systems. Technical challenges inherent to complex thesauri and how to overcome them will be outlined. These issues being solved, thesauri have become an essential feature of the Flanders Heritage inventory management system. The number of vocabularies rose over the years and became an essential tool for integrating heritage from different disciplines. As a final improvement, thesauri went from being a core part of one application (the inventory management system) to forming an essential part of a new general resource oriented system architecture for Flanders Heritage influenced by Linked Data. For this purpose, a generic SKOS based editor was created. Due to the SKOS model being generic enough to be used outside of Flanders Heritage, the decision was made early on to develop this editor as an open source project called Atramhasis and share it with the larger heritage world.

  12. EMERGENCY CALLS

    CERN Multimedia

    2001-01-01

    IN URGENT NEED OF A DOCTOR GENEVA EMERGENCY SERVICES GENEVA AND VAUD 144 FIRE BRIGADE 118 POLICE 117 CERN FIREMEN 767-44-44 ANTI-POISONS CENTRE Open 24h/24h 01-251-51-51 Patient not fit to be moved, call family doctor, or: GP AT HOME, open 24h/24h 748-49-50 Association Of Geneva Doctors Emergency Doctors at home 07h-23h 322 20 20 Patient fit to be moved: HOPITAL CANTONAL CENTRAL 24 Micheli-du-Crest 372-33-11 ou 382-33-11 EMERGENCIES 382-33-11 ou 372-33-11 CHILDREN'S HOSPITAL 6 rue Willy-Donzé 372-33-11 MATERNITY 32 bvd.de la Cluse 382-68-16 ou 382-33-11 OPHTHALMOLOGY 22 Alcide Jentzer 382-33-11 ou 372-33-11 MEDICAL CENTRE CORNAVIN 1-3 rue du Jura 345 45 50 HOPITAL DE LA TOUR Meyrin EMERGENCIES 719-61-11 URGENCES PEDIATRIQUES 719-61-00 LA TOUR MEDICAL CENTRE 719-74-00 European Emergency Call 112 FRANCE EMERGENCY SERVICES 15 FIRE BRIGADE 18 POLICE 17 CERN FIREMEN AT HOME 00-41-22-767-44-44 ANTI-POISONS CENTRE Open 24h/24h 04-72-11-69-11 All doctors ...

  13. Just-in-time research: a call to arms for research into mobile technologies in higher education

    Directory of Open Access Journals (Sweden)

    Lucie Byrne-Davis

    2015-04-01

    Full Text Available Mobile technologies are becoming commonplace in society and in education. In higher education, it is crucial to understand the impact of constant access to information on the development of the knowledge and competence of the learner. This study reports on a series of four surveys completed by UK-based medical students (n=443 who received tablet computers (iPads from their medical school during their 4th year of study. Students were surveyed prior to receiving the iPads and again regarding their usage and experiences at 2, 6 and 12 months post receipt of tablets. Findings indicate that students differed in their use of iPads but that the majority felt that tablets had impacted on their learning and the majority were using them frequently (at least once a day during learning. Almost half of the students reported that clinical supervisors had raised the possibility of tablets changing patient care. These results, although only descriptive, raise important questions about the impact of mobile technologies on learning.

  14. YOUR SELF CALLS YOU BACK IN ONE MOMENT. THE PRESSURE OF IT TECHNOLOGY TO THE IDENTITY AND SOCIAL BEHAVIOR.

    Directory of Open Access Journals (Sweden)

    Krzysztof Albin

    2009-01-01

    Full Text Available The article is focused on the problems of the interaction between Self, Self-concepts, Self-believes with IT objects. In reference to the views of Self by William James, Russell Belk, Hazel Markus and Alvin Toffler the research described below give the picture of change in Self structure among the Polish Internet users. The intensive impact between the Self-concepts and IT technology is still getting stronger. The most important results:1. Over 1/5 subjects, users of the mobile phone and Internet, treat the mobile phone as the part of their Self-identity.2. 11% subjects treat the mobile phone as the part of their Self and without of this part the existence is impossible at all.3. 18% subjects, treat the memory and data of the mobile phone the same as the personal memory. The contacts with IT objects, especially mobile phone, lead to the change of autonomy of Self-perception and planning of everyday activity. The research described in the article are the second stage of research and lead to the next ones dedicated to more close examination of described below effects. The influence of IT technology to the Self structure is still getting stronger. The specific direction of the influence is difficult to close prediction in this moment, but in opinion of author must be monitored and described. Because of geometric increase of intensity of the contact between the human being and the IT objects the forms the activity easy-to-do until today could impossible to manage without of the IT support. For example in first stage of the research, made with IDI methodology, the subjects declare the lack of the chance of meeting with friends in the downtown without the support of the mobile phone. From the other hand the strong positive impact between the IT technology and cognitive abilities are undeniable in behavior in abstract level activity. In the opinion of author the name "mobile phone" is not actual in Polish culture anymore. This IT object should be

  15. 基于认知无线电技术及其运用研究%Cognitive Radio Technology and Its Application

    Institute of Scientific and Technical Information of China (English)

    杨浏

    2011-01-01

    随着科技的发展,人们生活水平的提高,无线用户逐渐增多,这使得原本宽松的频谱资源越来越紧张.而认知无线电技术给出一种全新的频率资源综合利用思路,大大提高频谱资源的利用率.首先介绍认知无线电技术的基本概念,接着分析认知无线电技术的关键技术和目前的运用情况.%The wireless users are gradually increased with development of technology and growth of people's living standards, which reduces the spectrum resources. The cognitive radio technology gives a new idea of the comprehensive utilization of frequency resources for greatly improving the utilization of spectrum resources. The basic concepts of cognitive radio technology is introduced, the usage of key technologies and the current situation of cognitive radio technology are analyzed.

  16. MOSFET technologies for double-pole four-throw radio-frequency switch

    CERN Document Server

    Srivastava, Viranjay M

    2014-01-01

    This book provides analysis and discusses the design of various MOSFET technologies which are used for the design of Double-Pole Four-Throw (DP4T) RF switches for next generation communication systems. The authors discuss the design of the (DP4T) RF switch by using the Double-Gate (DG) MOSFET, as well as the Cylindrical Surrounding double-gate (CSDG) MOSFET.  The effect of HFO2 (high dielectric material) in the design of DG MOSFET and CSDG MOSFET  is also explored. Coverage includes comparison of Single-gate MOSFET and Double-gate MOSFET switching parameters, as well as testing of MOSFETs parameters using image acquisition.  ·         Provides a single-source reference to the latest technologies for the design of Double-gate MOSFET, Cylindrical Surrounding double-gate MOSFET and HFO2 based MOSFET; ·         Explains the design of RF switches using the technologies presented and simulates switches; ·         Verifies parameters and discusses feasibility of devices and switches.

  17. High-throughput and low-latency 60GHz small-cell network architectures over radio-over-fiber technologies

    Science.gov (United States)

    Pleros, N.; Kalfas, G.; Mitsolidou, C.; Vagionas, C.; Tsiokos, D.; Miliou, A.

    2017-01-01

    Future broadband access networks in the 5G framework will need to be bilateral, exploiting both optical and wireless technologies. This paper deals with new approaches and synergies on radio-over-fiber (RoF) technologies and how those can be leveraged to seamlessly converge wireless technology for agility and mobility with passive optical networks (PON)-based backhauling. The proposed convergence paradigm is based upon a holistic network architecture mixing mm-wave wireless access with photonic integration, dynamic capacity allocation and network coding schemes to enable high bandwidth and low-latency fixed and 60GHz wireless personal area communications for gigabit rate per user, proposing and deploying on top a Medium-Transparent MAC (MT-MAC) protocol as a low-latency bandwidth allocation mechanism. We have evaluated alternative network topologies between the central office (CO) and the access point module (APM) for data rates up to 2.5 Gb/s and SC frequencies up to 60 GHz. Optical network coding is demonstrated for SCM-based signaling to enhance bandwidth utilization and facilitate optical-wireless convergence in 5G applications, reporting medium-transparent network coding directly at the physical layer between end-users communicating over a RoF infrastructure. Towards equipping the physical layer with the appropriate agility to support MT-MAC protocols, a monolithic InP-based Remote Antenna Unit optoelectronic PIC interface is shown that ensures control over the optical resource allocation assisting at the same time broadband wireless service. Finally, the MT-MAC protocol is analysed and simulation and analytical theoretical results are presented that are found to be in good agreement confirming latency values lower than 1msec for small- to mid-load conditions.

  18. AN EMPIRICAL STUDY FOR RADIO FREQUENCY IDENTIFICATION (RFID ADOPTION BY SMEs IN THE TAIWANESE INFORMATION TECHNOLOGY (IT INDUSTRY

    Directory of Open Access Journals (Sweden)

    Hsin Chen

    2012-07-01

    Full Text Available Radio Frequency Identification (RFID technology represents a common standard for data storage and retrieval that could improve collaboration and data sharing between non-competing organisations. With the advent of RFID, organisations have the opportunity to rethink how their organisation will operate and integrate in the supply chain. Especially for Small to Medium Sized Enterprises (SMEs, that they have limited resources adopting such an innovative technology (i.e. RFID the adoption decision can be daunting. Literature indicates that SMEs that decide to go on with implementation have so far only a few guidelines from either private companies or public authorities regarding awareness on specific opportunities and risks. This research is therefore trying to explore in detail the factors that affect SMEs' RFID adoption in the Taiwan Information Technology (IT manufacturing industry. We are employing Exploratory Factor Analysis (EFA techniques and utilising a questionnaire survey in order to collect and analyse our data. After classifying the responding SMEs into three different adopters categories named ready adopter, initiator adopter and unprepared adopter using EFA technique our results show that each category has some specific adoption factors related to their unique situation. These are for ready adopters: cost and management, for initiator adopters: competitiveness and process efficiency and unprepared adopters: IT management difficulties, IT implementation difficulties and cost of implementation. A SMEs RFID adoption model is then proposed. It is anticipated that the findings of this research will not only enhance the research in RFID adoption in SMEs, but can also act as a reference for practitioners in the industry and researchers in the academic field.

  19. Analysis and Application of RFID Radio Frequency Technology in Libraries%RFID无线射频技术在图书馆的应用分析

    Institute of Scientific and Technical Information of China (English)

    陈海钦

    2011-01-01

    This paper describes the working principle of radio frequency RFID, and it' s application and significance of radio fi'equency RFID technology in the Library, By the means of electronic tags, the circulation of books, self-lending, security, inventory, retirement, shelves assortment, automatic sorting are all accomplished by RFID radio frequency identification technology which realizes the situation of the quick and easy self-service borrowing, reliable and ac- curate anti-theft system, fast stock counting, books looking up and shelves assortment. This paper makes the comparison of RFID technology and barcode technology, the advantages and disadvantages of several different frequency of RFID technology applied in the library, and it also refers the UHF radio frequency RFID technology applied in the children's library practically.%阐述了RFID无线射频技术的工作原理,以及RFID无线射频技术在图书馆的应用及意义,RFID无线射频识别技术使图书的借还、自助借阅、防盗、盘点、检索、整理书架、自动分拣均通过电子标签完成。真正实现了自助借阅的快捷方便,防盗系统的可靠准确和盘点、找书、整理书架的快速。对无线射频识别技术与条形码技术进行了比较,分析了几种不同频段的RFID技术在图书馆应用中的优缺点,介绍了超高频RFID无线射频技术在少年儿童图书馆的实际应用。

  20. STEM on the radio

    Science.gov (United States)

    Showstack, Randy

    2011-10-01

    Looking for an Internet radio station focusing on programing about science, technology, engineering, and math (STEM)? The U.S. National Science Foundation (NSF) announced on 26 September the launch of Science360 Radio, which it says is the first Internet radio stream dedicated to STEM programing. Science360 includes more than 100 radio shows and podcasts that are available on the Web as well as on iPhone and Android devices. The shows originate from a variety of sources, including NSF, other U.S. government agencies, science organizations, universities, and media outlets. For more information, see http://science360.gov/files/.

  1. Radio-tracking large wilderness mammals: integration of GPS and Argos technologies

    Science.gov (United States)

    Schwartz, Charles C.; Arthur, Steve M.

    1999-01-01

    We tested 30 prototype global positioning system (GPS) radiocollars on brown bears (Ursus arctos) over a 3-year period on the Kenai Peninsula, Alaska. Collars were of 2 design types: GPS units with an Argos (Argos Data collection and Location System) satellite uplink (n = 19) and GPS units where the data were stored on board (n = 10) for retrieval at a later date. All units also contained a conventional VHF (very high frequency) transmitter and weighed 1.7 kg. GPS-Argos units obtained 10-82% of expected GPS fixes, and fix rate declined significantly (P technology using the course acquisition code. Reduced accuracy was likely a result of the proportion of 2-dimensional versus 3-dimensional fixes obtained, although we could not determine this statistic from recorded data. Increased overstory closure was the only variable measured that partially explained the reduced likelihood of a successful fix. Stem density, stem diameter, and overstory height measured within 3 m of the collar did not affect fix success. GPS fix success rates for collars attached to bears varied more and were lower than fix rates for stationary collars placed in various vegetation types, suggesting that the bear, terrain, and movement all influence both fix and uplink success rate. Application of this new technology to grizzly and brown bear research and comparisons to studies with moose (Alces alces) are discussed.

  2. A reconfigurable radio architecture for Cognitive Radio in emergency networks

    NARCIS (Netherlands)

    Zhang, Q.; Kokkeler, Andre B.J.; Smit, Gerardus Johannes Maria

    2006-01-01

    Cognitive Radio has been proposed as a promising technology to solve today’s spectrum scarcity problem. Cognitive Radio is able to sense the spectrum to find the free spectrum, which can be optimally used by Cognitive Radio without causing interference to the licensed user. In the scope of the

  3. A reconfigurable radio architecture for Cognitive Radio in emergency networks

    NARCIS (Netherlands)

    Zhang, Q.; Kokkeler, Andre B.J.; Smit, Gerardus Johannes Maria

    2006-01-01

    Cognitive Radio has been proposed as a promising technology to solve today’s spectrum scarcity problem. Cognitive Radio is able to sense the spectrum to find the free spectrum, which can be optimally used by Cognitive Radio without causing interference to the licensed user. In the scope of the Adapt

  4. A Reconfigurable Radio Architecture for Cognitive Radio in Emergency Networks

    NARCIS (Netherlands)

    Zhang, Qiwei; Kokkeler, Andre B.J.; Smit, Gerard J.M.

    2006-01-01

    Cognitive Radio has been proposed as a promising technology to solve today's spectrum scarcity problem. Cognitive Radio is able to sense the spectrum to find the free spectrum, which can be optimally used by Cognitive Radio without causing interference to the licensed user. In the scope of the Adapt

  5. In vivo histological evaluation of fractional ablative microplasma radio frequency technology using a roller tip: an animal study.

    Science.gov (United States)

    Li, Xiaodan; Fang, Lin; Huang, Luping

    2015-12-01

    The aim of the present study is to investigate the histological characteristics associated with microplasma radio frequency (MPRF) technology in an animal study using different treatment parameters. Two white piglets, aged 6 months, received MPRF treatment using a roller tip; the treatment site was located on the dorsal skin. Four groups of parameters were adopted regarding the performance of the treatment at four zones on the dorsum. Immediately, at 7 days and at 1, 3, and 6 months posttreatment, we observed the healing process and obtained specimens from each treatment zone. Hematoxylin and eosin and Masson stainings of histological sections were performed to assess the degree of tissue injury, the heat effect, the healing process, and neocollagenesis. Heat shock protein (HSP) was also detected using immunohistochemistry. The roller tip generated a fractional treatment, which had a general trend involving an increase in depth and width with increasing pulse energy and decreasing sliding speed. During the wound healing process, dermal neocollagenesis was stimulated, remodeled, and matured gradually. The expression of HSP47 and HPS72 was elevated in the dermis surrounding the microlesions after treatment; it peaked at 1 month posttreatment and became diffuse in the dermis. MPRF is a promising fractional skin resurfacing technique. The roller tip can be used with low risk in the entire treatment zone with rapid healing. An appropriate treatment regimen should be chosen to guarantee therapeutic efficacy and safety.

  6. A reusable robust radio frequency biosensor using microwave resonator by integrated passive device technology for quantitative detection of glucose level.

    Science.gov (United States)

    Kim, N Y; Dhakal, R; Adhikari, K K; Kim, E S; Wang, C

    2015-05-15

    A reusable robust radio frequency (RF) biosensor with a rectangular meandered line (RML) resonator on a gallium arsenide substrate by integrated passive device (IPD) technology was designed, fabricated and tested to enable the real-time identification of the glucose level in human serum. The air-bridge structure fabricated by an IPD technology was applied to the RML resonator to improve its sensitivity by increasing the magnitude of the return loss (S21). The resonance behaviour, based on S21 characteristics of the biosensor, was analysed at 9.20 GHz with human serum containing different glucose concentration ranging from 148-268 mg dl(-1), 105-225 mg dl(-1) and at a deionised (D) water glucose concentration in the range of 25- 500 mg dl(-1) for seven different samples. A calibration analysis was performed for the human serum from two different subjects and for D-glucose at a response time of 60 s; the reproducibility, the minimum shift in resonance frequency and the long-term stability of the signal were investigated. The feature characteristics based on the resonance concept after the use of serum as an analyte are modelled as an inductor, capacitor and resistor. The findings support the development of resonance-based sensing with an excellent sensitivity of 1.08 MHz per 1 mg dl(-1), a detection limit of 8.01 mg dl(-1), and a limit of quantisation of 24.30 mg dl(-1). Copyright © 2014 The Authors. Published by Elsevier B.V. All rights reserved.

  7. Ultra Low Power, Radiation Tolerant UHF Radio Technologies for In Situ Communication Applications

    Science.gov (United States)

    Lay, N. E.

    2001-01-01

    For future deep space missions, significant reductions in the mass and power requirements for short-range telecommunication systems will be critical in enabling a wide variety of new mission concepts. These possibilities include penetrators, gliders, miniature rovers, and sensor networks. Under joint funding from NASA's Cross Enterprise and JPL's Telecommunications and Mission technology programs, recent development activity has focused on the design of ultralow mass and power transceiver systems and subsystems suitable for operation in a flight environment. For these efforts, the functionality of the transceiver has been targeted towards a specific Mars communications scenario. However, the overall architecture is well suited to any short or medium range application where a remote probe will aperiodically communicate with a base station, possibly an orbiter, for the eventual purpose of relaying science information back to Earth. In 2001, these sponsors have been augmented with collaborative expertise and funding from JPL's Center for Integrated Space Microsystems in order to migrate existing concepts and designs to a System on a Chip (SOAC) solution. Additional information is contained in the original extended abstract.

  8. New technology based on clamping for high gradient radio frequency photogun

    Science.gov (United States)

    Alesini, David; Battisti, Antonio; Ferrario, Massimo; Foggetta, Luca; Lollo, Valerio; Ficcadenti, Luca; Pettinacci, Valerio; Custodio, Sean; Pirez, Eylene; Musumeci, Pietro; Palumbo, Luigi

    2015-09-01

    High gradient rf photoguns have been a key development to enable several applications of high quality electron beams. They allow the generation of beams with very high peak current and low transverse emittance, satisfying the tight demands for free-electron lasers, energy recovery linacs, Compton/Thomson sources and high-energy linear colliders. In the present paper we present the design of a new rf photogun recently developed in the framework of the SPARC_LAB photoinjector activities at the laboratories of the National Institute of Nuclear Physics in Frascati (LNF-INFN, Italy). This design implements several new features from the electromagnetic point of view and, more important, a novel technology for its realization that does not involve any brazing process. From the electromagnetic point of view the gun presents high mode separation, low peak surface electric field at the iris and minimized pulsed heating on the coupler. For the realization, we have implemented a novel fabrication design that, avoiding brazing, strongly reduces the cost, the realization time and the risk of failure. Details on the electromagnetic design, low power rf measurements and high power radiofrequency and beam tests performed at the University of California in Los Angeles (UCLA) are discussed in the paper.

  9. Ultra Low Power, Radiation Tolerant UHF Radio Technologies for In Situ Communication Applications

    Science.gov (United States)

    Lay, N. E.

    2001-01-01

    For future deep space missions, significant reductions in the mass and power requirements for short-range telecommunication systems will be critical in enabling a wide variety of new mission concepts. These possibilities include penetrators, gliders, miniature rovers, and sensor networks. Under joint funding from NASA's Cross Enterprise and JPL's Telecommunications and Mission technology programs, recent development activity has focused on the design of ultralow mass and power transceiver systems and subsystems suitable for operation in a flight environment. For these efforts, the functionality of the transceiver has been targeted towards a specific Mars communications scenario. However, the overall architecture is well suited to any short or medium range application where a remote probe will aperiodically communicate with a base station, possibly an orbiter, for the eventual purpose of relaying science information back to Earth. In 2001, these sponsors have been augmented with collaborative expertise and funding from JPL's Center for Integrated Space Microsystems in order to migrate existing concepts and designs to a System on a Chip (SOAC) solution. Additional information is contained in the original extended abstract.

  10. Call Admission Control performance model for Beyond 3G Wireless Networks

    Directory of Open Access Journals (Sweden)

    Ramesh Babu H.S

    2009-12-01

    Full Text Available The Next Generation Wireless Networks (NGWN will be heterogeneous in nature where the different Radio Access Technologies (RATs operate together .The mobile terminals operating in this heterogeneous environment will have different QoS requirements to be handled by the system. These QoS requirements are determined by a set of QoS parameters. The radio resource management is one of the key challenges in NGWN.Call admission control is one of the radio resource management technique plays instrumental role in ensure the desired QoS to the users working on different applications which have diversified QoS requirements from the wireless networks . The call blocking probability is one such QoS parameter for the wireless network. For better QoS it is desirable to reduce the call blocking probability. In this customary scenario it is highly desirable to obtain analytic Performance model. In this paper we propose a higher order Markov chain based performance model for call admission control in a heterogeneous wireless network environment. In the proposed algorithm we have considered three classes of traffic having different QoS requirements and we have considered the heterogeneous network environment which includes the RATs that can effectively handle applications like voice calls, Web browsing and file transfer applications which are with varied QoS parameters. The paper presents the call blocking probabilities for all the three types of traffic both for fixed and varied traffic scenario.Keywords: Radio Access Technologies; Call admission control; Call blocking probability; Markov model; Heterogeneous wireless Networks.

  11. Enhanced nurse call systems.

    Science.gov (United States)

    2001-04-01

    This Evaluation focuses on high-end computerized nurse call systems--what we call enhanced systems. These are highly flexible systems that incorporate microprocessor and communications technologies to expand the capabilities of the nurse call function. Enhanced systems, which vary in configuration from one installation to the next, typically consist of a basic system that provides standard nurse call functionality and a combination of additional enhancements that provide the added functionality the facility desires. In this study, we examine the features that distinguish enhanced nurse call systems from nonenhanced systems, focusing on their application and benefit to healthcare facilities. We evaluated seven systems to determine how well they help (1) improve patient care, as well as increase satisfaction with the care provided, and (2) improve caregiver efficiency, as well as increase satisfaction with the work environment. We found that all systems meet these objectives, but not all systems perform equally well for all implementations. Our ratings will help facilities identify those systems that offer the most effective features for their intended use. The study also includes a Technology Management Guide to help readers (1) determine whether they'll benefit from the capabilities offered by enhanced systems and (2) target a system for purchase and equip the system for optimum performance and cost-effective operation.

  12. Radio Journalism.

    Science.gov (United States)

    Bittner, John R.; Bittner, Denise A.

    This book, a how-to-do-it guide for the novice and the professional alike, deals with several aspects of radio journalism: producing documentaries, preparing and announcing radio news, ethics and responsibility, regulation of radio journalism, and careers. It traces the history and growth of radio news, shows its impact on the public, and…

  13. Radio Graceful Hamming Graphs

    Directory of Open Access Journals (Sweden)

    Niedzialomski Amanda

    2016-11-01

    Full Text Available For k ∈ ℤ+ and G a simple, connected graph, a k-radio labeling f : V (G → ℤ+ of G requires all pairs of distinct vertices u and v to satisfy |f(u − f(v| ≥ k + 1 − d(u, v. We consider k-radio labelings of G when k = diam(G. In this setting, f is injective; if f is also surjective onto {1, 2, . . . , |V (G|}, then f is a consecutive radio labeling. Graphs that can be labeled with such a labeling are called radio graceful. In this paper, we give two results on the existence of radio graceful Hamming graphs. The main result shows that the Cartesian product of t copies of a complete graph is radio graceful for certain t. Graphs of this form provide infinitely many examples of radio graceful graphs of arbitrary diameter. We also show that these graphs are not radio graceful for large t.

  14. A system utilizing radio frequency identification (RFID) technology to monitor individual rodent behavior in complex social settings.

    Science.gov (United States)

    Howerton, Christopher L; Garner, Joseph P; Mench, Joy A

    2012-07-30

    Pre-clinical investigation of human CNS disorders relies heavily on mouse models. However these show low predictive validity for translational success to humans, partly due to the extensive use of rapid, high-throughput behavioral assays. Improved assays to monitor rodent behavior over longer time scales in a variety of contexts while still maintaining the efficiency of data collection associated with high-throughput assays are needed. We developed an apparatus that uses radio frequency identification device (RFID) technology to facilitate long-term automated monitoring of the behavior of mice in socially or structurally complex cage environments. Mice that were individually marked and implanted with transponders were placed in pairs in the apparatus, and their locations continuously tracked for 24 h. Video observation was used to validate the RFID readings. The apparatus and its associated software accurately tracked the locations of all mice, yielding information about each mouse's location over time, its diel activity patterns, and the amount of time it was in the same location as the other mouse in the pair. The information that can be efficiently collected in this apparatus has a variety of applications for pre-clinical research on human CNS disorders, for example major depressive disorder and autism spectrum disorder, in that it can be used to quantify validated endophenotypes or biomarkers of these disorders using rodent models. While the specific configuration of the apparatus described here was designed to answer particular experimental questions, it can be modified in various ways to accommodate different experimental designs. Copyright © 2012 Elsevier B.V. All rights reserved.

  15. 33 CFR 401.64 - Calling in.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Calling in. 401.64 Section 401.64... SEAWAY REGULATIONS AND RULES Regulations Radio Communications § 401.64 Calling in. (a) Every vessel, intending to transit or in transit, shall report on the assigned frequency to the designated Seaway...

  16. 在C#.NET中调用CLIPS的技术实现与应用%Implementation and Application of Calling the CLIPS Technology in the C#.NET

    Institute of Scientific and Technical Information of China (English)

    韦辽

    2015-01-01

    The CLIPS language was introduced, the technology and method of realization of ClipsNET component reference in C# was researched ,the method and process of realization of C#.NET called CLIPS programming technology was discussed.A new way to the develop expert system was provided. By the example of designing wheel expert system ,the Windows user interface of the development of expert system was realized. The method can improve the efficiency and reduce the cost of the development of the expert system. The method has a guiding role on the use of C#.NET language to develop the expert system.%介绍了CLIPS语言,研究了在C#中引用ClipsNET组件的实现技术和方法,C#.NET中调用CLIPS编程的技术实现方法和过程,及开发专家系统的新途径。通过车轮专家系统设计实例,实现了高效开发专家系统的Windows用户界面。该方法可以提高专家系统的开发效率,降低开发成本,对使用C#.NET语言进行专家系统开发具有指导作用。

  17. Radio observations of Planck clusters

    CERN Document Server

    Kale, Ruta

    2012-01-01

    Recently, a number of new galaxy clusters have been detected by the ESA-Planck satellite, the South Pole Telescope and the Atacama Cosmology Telescope using the Sunyaev-Zeldovich effect. Several of the newly detected clusters are massive, merging systems with disturbed morphology in the X-ray surface brightness. Diffuse radio sources in clusters, called giant radio halos and relics, are direct probes of cosmic rays and magnetic fields in the intra-cluster medium. These radio sources are found to occur mainly in massive merging clusters. Thus, the new SZ-discovered clusters are good candidates to search for new radio halos and relics. We have initiated radio observations of the clusters detected by Planck with the Giant Metrewave Radio Telescope. These observations have already led to the detection of a radio halo in PLCKG171.9-40.7, the first giant halo discovered in one of the new Planck clusters.

  18. 广播电视发射技术维护问题探析%Analysis on the Maintenance of Radio and TV Emission Technology

    Institute of Scientific and Technical Information of China (English)

    黄秉良

    2015-01-01

    随着无线局安全传输自动控制平台的搭建与后续的投入运行使用,也预示着广播电视发射事业迈入了信息化、自动化、网络化的新阶段。在新的时代下,广播电视提出了如何创新技术维护的新课题。因此,文章从广播电视技术维护管理的重要性入手,探讨广播电视发射技术维护的现状与改善,从而基于广播电视发射天线故障维护策略对技术维护工作进行了更细致的分析。%With the establishment and subsequent operation of the automatic control platform of the wireless bureau security transmission, it also indicates that the launch of the broadcasting TV has entered a new stage of informationization, automation and network.. In the new era, radio and TV put forward a new topic of how to innovate technology maintenance.. The from radio and television technical maintenance management the importance of discussion on current situation and improvement of radio and television transmission technology maintenance, thus based on the radio and TV transmitting antenna maintenance strategy of technical maintenance work for more detailed analysis.

  19. Call Centre- Computer Telephone Integration

    Directory of Open Access Journals (Sweden)

    Dražen Kovačević

    2012-10-01

    Full Text Available Call centre largely came into being as a result of consumerneeds converging with enabling technology- and by the companiesrecognising the revenue opportunities generated by meetingthose needs thereby increasing customer satisfaction. Regardlessof the specific application or activity of a Call centre, customersatisfaction with the interaction is critical to the revenuegenerated or protected by the Call centre. Physical(v, Call centreset up is a place that includes computer, telephone and supervisorstation. Call centre can be available 24 hours a day - whenthe customer wants to make a purchase, needs information, orsimply wishes to register a complaint.

  20. Boom Booom Net Radio

    DEFF Research Database (Denmark)

    Grimshaw, Mark Nicholas; Yong, Louisa; Dobie, Ian

    1999-01-01

    of an existing Internet radio station; Boom Booom Net Radio. Whilst necessity dictates some use of technology-related terminology, wherever possible we have endeavoured to keep such jargon to a minimum and to either explain it in the text or to provide further explanation in the appended glossary.......Internet radio is one of the growth areas of the Internet but, as this article will show, is fraught with difficulties and frustration for both the modestly-funded broadcaster (bitcaster) and the listener. The article will illustrate some of these problems by means of a short case study...

  1. Cognitive radio technology and its application in military communication%认知无线电技术及在军事通信中的应用

    Institute of Scientific and Technical Information of China (English)

    费利军; 王亚鸽

    2014-01-01

    The cognitive radio(CR)is a new concept following the software radio in the communication field,and it focu-ses on the adjusting the system running parameters on the basis of sensing surrounding. The concept of CR and its relation with software radio are described in this paper. Its structure and key technologies are introduced. The advantages of CR in the mili-tary communication and the challenge it is facing are analyzed. It has a positive role in upgrade construction of the communica-tion systems in China.%认知无线电是通信领域在软件无线电概念之后出现的又一新概念,其主要关注于系统通过感知操作环境的变化调整系统工作参数。叙述了认知无线电的概念及与软件无线电的关系,对其构架和关键技术进行了介绍,并分析了认知无线电在军事通信领域的优势及面临的挑战,对于我军通信系统的升级建设具有积极作用。

  2. Flexible Adaptation in Cognitive Radios

    CERN Document Server

    Li, Shujun

    2013-01-01

    This book provides an introduction to software-defined radio and cognitive radio, along with methodologies for applying knowledge representation, semantic web, logic reasoning and artificial intelligence to cognitive radio, enabling autonomous adaptation and flexible signaling. Readers from the wireless communications and software-defined radio communities will use this book as a reference to extend software-defined radio to cognitive radio, using the semantic technology described. Readers with a background in semantic web and artificial intelligence will find in this book the application of semantic web and artificial intelligence technologies to wireless communications. For readers in networks and network management, this book presents a new approach to enable interoperability, collaborative optimization and flexible adaptation of network components. Provides a comprehensive ontology covering the core concepts of wireless communications using a formal language; Presents the technical realization of using a ...

  3. Call Forecasting for Inbound Call Center

    Directory of Open Access Journals (Sweden)

    Peter Vinje

    2009-01-01

    Full Text Available In a scenario of inbound call center customer service, the ability to forecast calls is a key element and advantage. By forecasting the correct number of calls a company can predict staffing needs, meet service level requirements, improve customer satisfaction, and benefit from many other optimizations. This project will show how elementary statistics can be used to predict calls for a specific company, forecast the rate at which calls are increasing/decreasing, and determine if the calls may stop at some point.

  4. HD Radio技术及其应用的思考%HD Radio Technology and Its Application

    Institute of Scientific and Technical Information of China (English)

    李栋

    2007-01-01

    本文简要介绍美国HD Radio技术的发展与应用现状,阐述HD Radio技术系统的原理和特征,包括应用在调频广播中的FM HD Radio和应用在中波广播中的AM HD Radio,并讨论了HD Radio技术的应用问题.

  5. The digital sport radio.

    Directory of Open Access Journals (Sweden)

    Hilario José ROMERO BEJARANO

    2014-07-01

    Full Text Available Radio has been immersed in recent years in a phase of technological integration and business of multimedia, as well as diversification of systems and channels for broadcasting. In addition, Internet has been consolidated as the platform of digital radio that more has evolved as a result of its continued expansion. However, the merger radio-Internet must be understood as a new form of communication, and not solely as a new complementary medium. In this context, it is of great interest to analyze that transformations in the way of reception, contents, languages, programs and schedules, has brought with it for the radio that integration. To this end is taken as main reference the sports areas, a key aspect and broadly representative of the current broadcasting landscape.

  6. Division x: Radio Astronomy

    Science.gov (United States)

    Taylor, Russ; Chapman, Jessica; Rendong, Nan; Carilli, Christopher; Giovannini, Gabriele; Hills, Richard; Hirabayashi, Hisashi; Jonas, Justin; Lazio, Joseph; Morganti, Raffaella; Rubio, Monica; Shastri, Prajval

    2012-04-01

    This triennium has seen a phenomenal investment in development of observational radio astronomy facilities in all parts of the globe at a scale that significantly impacts the international community. This includes both major enhancements such as the transition from the VLA to the EVLA in North America, and the development of new facilities such as LOFAR, ALMA, FAST, and Square Kilometre Array precursor telescopes in Australia and South Africa. These developments are driven by advances in radio-frequency, digital and information technologies that tremendously enhance the capabilities in radio astronomy. These new developments foreshadow major scientific advances driven by radio observations in the next triennium. We highlight these facility developments in section 3 of this report. A selection of science highlight from this triennium are summarized in section 2.

  7. Boom Booom Net Radio

    DEFF Research Database (Denmark)

    Grimshaw, Mark Nicholas; Yong, Louisa; Dobie, Ian

    1999-01-01

    Internet radio is one of the growth areas of the Internet but, as this article will show, is fraught with difficulties and frustration for both the modestly-funded broadcaster (bitcaster) and the listener. The article will illustrate some of these problems by means of a short case study of an exi......Internet radio is one of the growth areas of the Internet but, as this article will show, is fraught with difficulties and frustration for both the modestly-funded broadcaster (bitcaster) and the listener. The article will illustrate some of these problems by means of a short case study...... of an existing Internet radio station; Boom Booom Net Radio. Whilst necessity dictates some use of technology-related terminology, wherever possible we have endeavoured to keep such jargon to a minimum and to either explain it in the text or to provide further explanation in the appended glossary....

  8. The Network Monitoring Technology for Shanxi Radio and TV Work%山西广播电视监测网络技术

    Institute of Scientific and Technical Information of China (English)

    段丽媛

    2012-01-01

    Based on SDH communication theory, Ethernet network technology based on digital microwave transmission channels is researched and deeply studied in this paper. Taking radio and television network in Shanxi Province as an example, it elaborates the key technology and maintenance point on the process of network construction. According to local conditions, the network organizes the nets successfully with using the method of digital microwave transmission. It not only rationally uses the radio and television resources in this way, but also has more practical significance in the aspect of integrated application of the digital microwave transmission.%根据SDH通信原理,研究并拓展了基于数字微波传输通道的以太网络技术,以山西广播电视监测网络为实例,详细阐述了网络建设过程中的关键技术和维护要点。该网络结合自身特点,因地制宜采用数字微波传输方式成功进行组网,不仅合理利用了广电资源,在数字微波的综合应用方面也有较为实用的借鉴意义。

  9. Smart Antenna Technology Based on Software Radio%基于软件无线电的智能天线技术

    Institute of Scientific and Technical Information of China (English)

    熊建云

    2013-01-01

    Smart antenna and software radio technology using antenna array beamforming technique based on the open architecture, reconfigurable system, at the same time, through the signal sampling and processing in time and space, can be more fully develops the useful information contained in the signal. Software radio and smart antenna mutual infiltration, mutual promotion, application of smart antenna technology in mobile communication system can improve the system performance and capacity, and it can simplify the control system.%  基于软件无线电技术的智能天线利用天线阵波束成形技术,采用开放式结构,系统可重构,通过同时对信号在时间和空间上进行采样和处理,可以更充分地开发信号中蕴含的有用信息。软件无线电与智能天线互相渗透、互相促进,在移动通信系统中应用智能天线技术可以提高系统的性能和容量,并可以简化系统控制。

  10. A review of radio frequency identification technology for the anatomic pathology or biorepository laboratory: Much promise, some progress, and more work needed

    Directory of Open Access Journals (Sweden)

    Jerry J Lou

    2011-01-01

    Full Text Available Patient safety initiatives throughout the anatomic laboratory and in biorepository laboratories have mandated increasing emphasis on the need for accurately identifying and tracking biospecimen assets throughout their production lifecycle and for archiving/retrieval purposes. However, increasing production volume along with complex workflow characteristics, reliance on manual production processes, and required asset movement to disparate destinations throughout asset lifecycles continue to challenge laboratory efforts. Radio Frequency Identification (RFID technology, use of radio waves to communicate data between electronic tags attached to objects and a reader, shows significant potential to facilitate and overcome these hurdles. Advantages over traditional barcode labeling include readability without direct line-of-sight alignment to the reader, ability to read multiple tags simultaneously, higher data storage capacity, faster data transmission rate, and capacity to perform multiple read-writes of data to the tag. Most importantly, use of radio waves decreases the need to manually scan each asset, and at each step, identification or tracking event is needed. Temperature monitoring by on-board sensors and three-dimensional position tracking are additional potential benefits of using RFID technology. To date, barriers to implementation of RFID systems in the anatomic laboratory include increased associated costs of tags and readers, system software, data security concerns, lack of specific data standards for stored information, and potential for technological obsolescence during decades of specimen storage. Novel RFID production techniques and increased production capacity are projected to lower costs of some tags to a few cents each. Potentially, information security concerns can be addressed by techniques such as shielding, data encryption, and tag pseudonyms. Commitment by stakeholder groups to develop RFID tag data standards for anatomic

  11. A review of radio frequency identification technology for the anatomic pathology or biorepository laboratory: Much promise, some progress, and more work needed.

    Science.gov (United States)

    Lou, Jerry J; Andrechak, Gary; Riben, Michael; Yong, William H

    2011-01-01

    Patient safety initiatives throughout the anatomic laboratory and in biorepository laboratories have mandated increasing emphasis on the need for accurately identifying and tracking biospecimen assets throughout their production lifecycle and for archiving/retrieval purposes. However, increasing production volume along with complex workflow characteristics, reliance on manual production processes, and required asset movement to disparate destinations throughout asset lifecycles continue to challenge laboratory efforts. Radio Frequency Identification (RFID) technology, use of radio waves to communicate data between electronic tags attached to objects and a reader, shows significant potential to facilitate and overcome these hurdles. Advantages over traditional barcode labeling include readability without direct line-of-sight alignment to the reader, ability to read multiple tags simultaneously, higher data storage capacity, faster data transmission rate, and capacity to perform multiple read-writes of data to the tag. Most importantly, use of radio waves decreases the need to manually scan each asset, and at each step, identification or tracking event is needed. Temperature monitoring by on-board sensors and three-dimensional position tracking are additional potential benefits of using RFID technology. To date, barriers to implementation of RFID systems in the anatomic laboratory include increased associated costs of tags and readers, system software, data security concerns, lack of specific data standards for stored information, and potential for technological obsolescence during decades of specimen storage. Novel RFID production techniques and increased production capacity are projected to lower costs of some tags to a few cents each. Potentially, information security concerns can be addressed by techniques such as shielding, data encryption, and tag pseudonyms. Commitment by stakeholder groups to develop RFID tag data standards for anatomic pathology and

  12. Radio archive

    OpenAIRE

    Street, Sean

    2008-01-01

    The Centre for Broadcasting History Research, in association with the\\ud British Universities Film and Video Council, is developing an online\\ud audio archive of UK commercial radio, from 1973 to 1992. Work produced\\ud before the Broadcasting Act 1990 represents a different ethos to the role\\ud commercial radio played, and subsequently,continues to play, in the UK.\\ud The change in commercial radio since this period is extraordinary. It is\\ud impossible for the young student of radio, born si...

  13. Cognitive Radio for Emergency Networks

    NARCIS (Netherlands)

    Zhang, Q.; Kokkeler, Andre B.J.; Smit, Gerardus Johannes Maria

    2006-01-01

    In the scope of the Adaptive Ad-hoc Freeband (AAF) project, an emergency network built on top of Cognitive Radio is proposed to alleviate the spectrum shortage problem which is the major limitation for emergency networks. Cognitive Radio has been proposed as a promising technology to solve todayâ?~B

  14. Cognitive Radio for Emergency Networks

    NARCIS (Netherlands)

    Zhang, Qiwei; Kokkeler, A.B.J.; Smit, G.J.M.

    2006-01-01

    In the scope of the Adaptive Ad-hoc Freeband (AAF) project, an emergency network built on top of Cognitive Radio is proposed to alleviate the spectrum shortage problem which is the major limitation for emergency networks. Cognitive Radio has been proposed as a promising technology to solve todayâ?~B

  15. Secure Cooperative Spectrum Sensing via a Novel User-Classification Scheme in Cognitive Radios for Future Communication Technologies

    Directory of Open Access Journals (Sweden)

    Muhammad Usman

    2015-05-01

    Full Text Available Future communication networks would be required to deliver data on a far greater scale than is known to us today, thus mandating the maximal utilization of the available radio spectrum using cognitive radios. In this paper, we have proposed a novel cooperative spectrum sensing approach for cognitive radios. In cooperative spectrum sensing, the fusion center relies on reports of the cognitive users to make a global decision. The global decision is obtained by assigning weights to the reports received from cognitive users. Computation of such weights requires prior information of the probability of detection and the probability of false alarms, which are not readily available in real scenarios. Further, the cognitive users are divided into reliable and unreliable categories based on their weighted energy by using some empirical threshold. In this paper, we propose a method to classify the cognitive users into reliable, neutral and unreliable categories without using any pre-defined or empirically-obtained threshold. Moreover, the computation of weights does not require the detection, or false alarm probabilities, or an estimate of these probabilities. Reliable cognitive users are assigned the highest weights; neutral cognitive users are assigned medium weights (less than the reliable and higher than the unreliable cognitive users’ weights; and unreliable users are assigned the least weights. We show the performance improvement of our proposed method through simulations by comparing it with the conventional cooperative spectrum sensing scheme through different metrics, like receiver operating characteristic (ROC curve and mean square error. For clarity, we also show the effect of malicious users on detection probability and false alarm probability individually through simulations.

  16. Call Admission Control performance model for Beyond 3G Wireless Networks

    CERN Document Server

    Babu, H S Ramesh; Satyanarayana, P S

    2010-01-01

    The Next Generation Wireless Networks (NGWN) will be heterogeneous in nature where the different Radio Access Technologies (RATs) operate together .The mobile terminals operating in this heterogeneous environment will have different QoS requirements to be handled by the system. These QoS requirements are determined by a set of QoS parameters. The radio resource management is one of the key challenges in NGWN. Call admission control is one of the radio resource management technique plays instrumental role in ensure the desired QoS to the users working on different applications which have diversified QoS requirements from the wireless networks . The call blocking probability is one such QoS parameter for the wireless network. For better QoS it is desirable to reduce the call blocking probability. In this customary scenario it is highly desirable to obtain analytic Performance model. In this paper we propose a higher order Markov chain based performance model for call admission control in a heterogeneous wireles...

  17. Radio responding media. Prosumers, media innovation in web-based radio

    OpenAIRE

    Brundu, Gabriella

    2015-01-01

    After a century of traditional broadcasting, this is the history of how the radio as a medium entered the web world, becoming web-based radios. Our case is based on an Italian web-radio, Radio Casa Bertallot, which started to make radio programmes using the possibilities of new media technology and the internet to create a platform for interacting with the users. The founder Alessio Bertallot, expressed his view on the radio production by describing the radio as, a place, as a home, a room, ...

  18. The in-line measurement of plant cell biomass using radio frequency impedance spectroscopy as a component of process analytical technology.

    Science.gov (United States)

    Holland, Tanja; Blessing, Daniel; Hellwig, Stephan; Sack, Markus

    2013-10-01

    Radio frequency impedance spectroscopy (RFIS) is a robust method for the determination of cell biomass during fermentation. RFIS allows non-invasive in-line monitoring of the passive electrical properties of cells in suspension and can distinguish between living and dead cells based on their distinct behavior in an applied radio frequency field. We used continuous in situ RFIS to monitor batch-cultivated plant suspension cell cultures in stirred-tank bioreactors and compared the in-line data to conventional off-line measurements. RFIS-based analysis was more rapid and more accurate than conventional biomass determination, and was sensitive to changes in cell viability. The higher resolution of the in-line measurement revealed subtle changes in cell growth which were not accessible using conventional methods. Thus, RFIS is well suited for correlating such changes with intracellular states and product accumulation, providing unique opportunities for employing systems biotechnology and process analytical technology approaches to increase product yield and quality. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  19. 62. The Return of Educational Radio?

    Science.gov (United States)

    Berman, Sally D.

    2008-01-01

    This paper examines one of the traditional technologies of distance education, radio, and presents examples of educational and community radio usage in Asia and Africa. Instead of merely transposing western approaches to distance education in developing countries, it is suggested that the developed world can learn from uses of radio in developing…

  20. New trends in meteor radio receivers

    Science.gov (United States)

    Rault, Jean-Louis

    2014-01-01

    Recent progresses in low cost—but performing—SDR (software defined radio) technology presents a major breakthrough in the domain of meteor radio observations. Their performances are now good enough for meteor work and should therefore encourage newcomers to join the meteor radio community.

  1. Protocols for Impulse Radio UWB Ad Hoc Networks

    NARCIS (Netherlands)

    Shi, N.

    2010-01-01

    Ultra Wideband (UWB) technology offers an unprecedented opportunity to further accelerate the evolution of wireless communication and expand the application landscape by enabling outstanding capabilities. UWB radio is fundamentally different from most radio technologies, e.g., Bluetooth, WLAN, etc.

  2. A Study of Theoretical Models for Managing Technology Change and a Comparison to a Radio Frequency Identification Implementation

    Science.gov (United States)

    1993-09-01

    Organic Model and the Ambidextrous Model for managing technological change. These models were developed outside the DOD to provide guidelines for...based programs, may benefit from the findings of this research. Finally, the researchers identified investigative questions and pertinent limitations of...provided in Chapter V. 1.7 II. Literature Review Introduction When new technologies become available, the AF may benefit from the use of the technology

  3. Application and development on radio over fiber technology%光载微波技术的应用及其发展趋势

    Institute of Scientific and Technical Information of China (English)

    张振朝

    2011-01-01

    The convergence of optical and wireless networking is a promising development for future access network architecture. In this paper, Composition, and key technic in design and implementation of the radio over fiber are mainly introduced, and its advantages and military issues can be solved is analysed in detail, The wide applications of RoF technologies for network convergence are presented in the end.%光载微波技术是未来接入网的一大发展方向.简要介绍了光载微波技术的构成、实现方式以及应用的关键技术,并详细分析了它的优势,展现了光载微波技术的广阔应用前景及发展趋势.

  4. RoF在无线接入领域的应用及发展趋势%Application and development of wireless access on radio over fiber technology

    Institute of Scientific and Technical Information of China (English)

    杨洋

    2012-01-01

    The convergence of optical and wireless networking is a promising development for fixture access network architecture. In this paper, composition, and key technic in design and implementation of the radio over fiber are mainly introduced, and its advantages and military issues can be solved is analysed in detail, The wide applications of RoF technologies for network convergence are presented in the end.%RoF技术是未来无线接入网的一大发展方向,简要介绍了RoF技术的构成、实现方式以及实用的关键技术,并详细分析了它的优势,展现了RoF技术的广阔应用前景及发展趋势.

  5. Radio Eska Lodz, Commercial Radio As a Local Radio

    OpenAIRE

    Szews, Przemysław

    2015-01-01

    The article discusses aspects of network-based local radio using the example of Radio Eska Lodz. The author responds to questions about whether a commercial network radio station can fulfill the functions of local radio and on what this locality is actually based. In this respect, Radio Eska Lodz is characterized as part of the most popular commercial radio network in Poland. The introduction focuses on the process of transformation that local radio stations are undergoing, along with its gen...

  6. Utilization of a Text and Translation Application for Communication With a Foreign Deaf Family: A Call for Validation of This Technology-A Case Report.

    Science.gov (United States)

    Fernandez, Patrick G; Brockel, Megan A; Lipscomb, Lisa L; Ing, Richard J; Tailounie, Muayyad

    2017-07-15

    Effective communication with patients is essential to quality care. Obviously, language barriers significantly impact this and can increase the risk of poor patient outcomes. Smartphones and mobile health technology are valuable resources that are beginning to break down language barriers in health care. We present a case of a challenging language barrier where successful perioperative communication was achieved using mobile technology. Although quite beneficial, use of technology that is not validated exposes providers to unnecessary medicolegal risk. We hope to highlight the need for validation of such technology to ensure that these tools are an effective way to accurately communicate with patients in the perioperative setting.

  7. Radio frequency (unidentification: Results from a proof-of-concept trial of the use of RFID technology to measure microenterprise turnover in Sri Lanka

    Directory of Open Access Journals (Sweden)

    Suresh de Mel

    2016-06-01

    Full Text Available Accurate measurement of stock levels, turnover, and profitability in microenterprises in developing countries is difficult due to the fact that the majority of these firms do not keep detailed records. We test the use of radio frequency identification (RFID tags as a means of objectively measuring stock levels and stock flow in small retail firms in Sri Lanka. In principle this offers the potential to track stock movements accurately. We compare the stock counts obtained from RFID reads to physical stock counts and to survey responses. We have three main findings. First, current RFID-technology is more difficult to use, and more time-consuming to employ, than we envisaged. Second, the technology works reasonably well for paper products, but very poorly for most products sold by microenterprises: on average we were able to read only about one-quarter of the products tagged, and there was considerable day-to-day variation in read-efficiency. This results from technical issues arising from read efficiency being comprised by liquids, metal, and product stacking. Third, a comparison of survey responses and physical stock-takes shows much higher accuracy for survey measures than RFID. As a result, we conclude that this technology is currently unsuitable for improving stock measurement in microenterprises, except perhaps for a few products.

  8. Solar Radio

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Scientists monitor the structure of the solar corona, the outer most regions of the Sun's atmosphere, using radio waves (100?s of MHz to 10?s of GHz). Variations in...

  9. Radios in the Classroom: Curriculum Integration and Communication Skills. ERIC Digest.

    Science.gov (United States)

    Ninno, Anton

    Teachers have explored the use of radio in the classroom almost since radio technology entered into the mainstream of society, yet radio remains a relatively unused mode of instruction. This Digest describes several radio applications and summarizes various radio activities to assist teachers in integrating technology into the curriculum.…

  10. Galactic radio astronomy

    CERN Document Server

    Sofue, Yoshiaki

    2017-01-01

    This book is a concise primer on galactic radio astronomy for undergraduate and graduate students, and provides wide coverage of galactic astronomy and astrophysics such as the physics of interstellar matter and the dynamics and structure of the Milky Way Galaxy and galaxies. Radio astronomy and its technological development have led to significant progress in galactic astronomy and contributed to understanding interstellar matter and galactic structures. The book begins with the fundamental physics of radio-wave radiation, i.e., black body radiation, thermal emission, synchrotron radiation, and HI and molecular line emissions. The author then gives overviews of ingredients of galactic physics, including interstellar matter such as the neutral (HI), molecular hydrogen, and ionized gases, as well as magnetic fields in galaxies. In addition, more advanced topics relevant to the Galaxy and galaxies are also contained here: star formation, supernova remnants, the Galactic Center and black holes, galactic dynamics...

  11. Electrical properties of radio-frequency sputtered HfO{sub 2} thin films for advanced CMOS technology

    Energy Technology Data Exchange (ETDEWEB)

    Sarkar, Pranab Kumar; Roy, Asim, E-mail: 28.asim@gmail.com [Department of Physics, National Institute of Technology Silchar, Silchar-788010, Assam, India Phone: +91-3842-224879 (India)

    2015-08-28

    The Hafnium oxide (HfO{sub 2}) high-k thin films have been deposited by radio frequency (rf) sputtering technique on p-type Si (100) substrate. The thickness, composition and phases of films in relation to annealing temperatures have been investigated by using cross sectional FE-SEM (Field Emission Scanning Electron Microscope) and grazing incidence x-ray diffraction (GI-XRD), respectively. GI-XRD analysis revealed that at annealing temperatures of 350°C, films phases change to crystalline from amorphous. The capacitance-voltage (C-V) and current-voltage (I-V) characteristics of the annealed HfO{sub 2} film have been studied employing Al/HfO{sub 2}/p-Si metal–oxide–semiconductor (MOS) structures. The electrical properties such as dielectric constant, interface trap density and leakage current density have been also extracted from C-V and I-V Measurements. The value of dielectric constant, interface trap density and leakage current density of annealed HfO{sub 2} film is obtained as 23,7.57×1011eV{sup −1} cm{sup −2} and 2.7×10{sup −5} Acm{sup −2}, respectively. In this work we also reported the influence of post deposition annealing onto the trapping properties of hafnium oxide and optimized conditions under which no charge trapping is observed into the dielectric stack.

  12. Tools of radio astronomy

    CERN Document Server

    Wilson, Thomas L; Hüttemeister, Susanne

    2013-01-01

    This 6th edition of “Tools of Radio Astronomy”, the most used introductory text in radio astronomy, has been revised to reflect the current state of this important branch of astronomy. This includes the use of satellites, low radio frequencies, the millimeter/sub-mm universe, the Cosmic Microwave Background and the increased importance of mm/sub-mm dust emission. Several derivations and presentations of technical aspects of radio astronomy and receivers, such as receiver noise, the Hertz dipole and  beam forming have been updated, expanded, re-worked or complemented by alternative derivations. These reflect advances in technology. The wider bandwidths of the Jansky-VLA and long wave arrays such as LOFAR and mm/sub-mm arrays such as ALMA required an expansion of the discussion of interferometers and aperture synthesis. Developments in data reduction algorithms have been included. As a result of the large amount of data collected in the past 20 years, the discussion of solar system radio astronomy, dust em...

  13. GNU Based Security in Software Defined Radio

    Directory of Open Access Journals (Sweden)

    H. B. Bhadka

    2012-11-01

    Full Text Available Various new technologies are explored for radio communication toward the 21st century. Among them the technology of "software defined radio" attracts large attention. Software Defined Radio (SDR technology implements some of the functional modules of a radio system in software enabling highly flexible handsets. SDR devices may be reconfigured dynamically via the download of new software modules. Malicious or malfunctioning downloaded software present serious security risks to SDR devices and networks in which they operate. Together with the use of software downloading, future terminals will become a platform to support the deployment of yet unspecified services and applications.

  14. LTE-advanced a practical systems approach to understanding 3GPP LTE releases 10 and 11 radio access technologies

    CERN Document Server

    Ahmadi, Sassan

    2013-01-01

    This book is an in-depth, systematic and structured technical reference on 3GPP's LTE-Advanced (Releases 10 and 11), covering theory, technology and implementation, written by an author who has been involved in the inception and development of these technologies for over 20 years. The book not only describes the operation of individual components, but also shows how they fit into the overall system and operate from a systems perspective. Uniquely, this book gives in-depth information on upper protocol layers, implementation and deployment issues, and services, making it suitable for engine

  15. 基于光纤无线融合的射频无源光网络%Converged Fiber-Wireless Radio Passive Optical Network Technologies

    Institute of Scientific and Technical Information of China (English)

    刘德明; 邓磊

    2012-01-01

    To increase the capacity of the access network and converge services, next-generation optical access network technologies are highly desirable. In this paper, we propose converged fiber-wireless radio passive optical (RPON) architecture. This incorporates the low-cost and easy-control of PON and the high flexibility, good mobility of radio over fiber. With millimeter-wave optical generator and wavelength division multiplexing, our RPON system is capable of transmitting 1 Gbit/s wireless signals over 10 km single mode fiber and 5 m air distance in both the upstream and downstream. Our proposed system can be applied at low cost.%文章认为为了实现更大的光接入网容量,并能更好地完成多业务的承载与融合,亟待发展下一代光接入网技术.文章提出了基于光纤无线融合的射频无源光网络(RPON),其不仅具有现有无源光网络系统低成本和易管控的特点,还具备光载射频系统灵活度高和移动性好的优势.该系统通过光生毫米波和波分复用的方式,实现了1 Gb/s多媒体业务的单纤上下行传输,达到了10 km光纤和5m无线的接入距离,能够满足低成本化推广应用要求.

  16. 基于Web的远程内容调用技术-Web JS%Content Remote Call Technology Based on Web

    Institute of Scientific and Technical Information of China (English)

    胡飞

    2012-01-01

    WEB JS, a up-to-date technology, draws content from remote server. Comparing with WEB Service technology, it is better in such fields as Operating and Coding. This technology will help people gain high performance.%作为云计算技术之一的远程内容调用技术,常规的做法是通过Web Service等技术实现.本文提出一种全新的调用技术:Web JS.该技术和前面的技术相比有操作简单、无须动态网页编程经验等诸多好处.

  17. Cognitive Wireless Communications - A paradigm shift in dealing with radio resources as a prerequisite for the wireless network of the future - An overview on the topic of cognitive wireless technologies

    Science.gov (United States)

    Haustein, Thomas; Stanczak, Slawomir; Wolisz, Adam; Jondral, Friedrich; Schotten, Hans; Kraemer, Rolf; Mück, Markus; Mennenga, Horst; Bender, Paul

    2016-07-01

    Wireless radio communications systems form the basis for mobile network connections in the digital society. A limited amount of radio spectrum and a spatially densified use of wireless communications systems require a resource-efficient use of the spectrum. Mechanisms of cognitive radio may hold the key to a more efficient use of the available spectrum under consideration of quality of service requirements. These mechanisms take advantage of location-specific knowledge of the wireless channel occupation in the dimensions of frequency, time, location and direction in space and therefore enable co-existent and reliable wireless communication. The authors give an introduction to the status of cognitive wireless communication technology, which represents the starting point of a series of research projects promoted by BMBF during 2012-2014.

  18. Radio astronomy

    CERN Document Server

    Alder, Berni

    1975-01-01

    Methods in Computational Physics, Volume 14: Radio Astronomy is devoted to the role of the digital computer both as a control device and as a calculator in addressing problems related to galactic radio noise. This volume contains four chapters and begins with a technical description of the hardware and the special data-handling problems of using radioheliography, with an emphasis on a selection of observational results obtained with the Culgoora radioheliograph and their significance to solar physics and to astrophysics in general. The subsequent chapter examines interstellar dispersion, i

  19. Tools of radio astronomy

    CERN Document Server

    Wilson, Thomas L; Hüttemeister, Susanne

    2009-01-01

    The recent years have seen breathtaking progress in technology, especially in the receiver and digital technologies relevant for radio astronomy, which has at the same time advanced to shorter wavelengths. This is the updated and completely revised 5th edition of the most used introductory text in radio astronomy. It presents a unified treatment of the entire field from centimeter to sub-millimeter wavelengths. Topics covered include instruments, sensitivity considerations, observational methods and interpretations of the data recorded with both single dishes and interferometers. This text is useful to both students and experienced practicing astronomers. Besides making major updates and additions throughout the book, the authors have re-organized a number of chapters to more clearly separate basic theory from rapidly evolving practical aspects. Further, problem sets have been added at the end of each chapter.

  20. The Concept of 'Radio Music'

    DEFF Research Database (Denmark)

    Fjeldsøe, Michael

    2016-01-01

    In the late 1920s, young composers and musicians turned towards new fields of activity and new media in order to reach a larger audience. In Germany, this effort was part of the movement of Neue Sachlichkeit, and for a short period of time, Radiomusik was considered the ideal means for a democratic......, as discussed by Kurt Weill and Paul Hindemith, was at first greeted with great expectations, but soon a more realistic attitude prevailed. Weill, himself a radio critic as well, composed Der Lindberghflug (1929) as a piece of ‘radio music theatre’, but then changed some of its features in order to turn...... it into a didactical play for amateurs, a so-called Lehrstück. The article will present the concept of ‘radio music’ developed within German Neue Sachlichkeit and discuss the relevance of such a concept for current research in the field of radio and music....

  1. 基于认知无线电的ROF-PON光无线接入技术%Hybrid Optical-Wireless Access Technology for Cognitive Radio Over ROF-PON

    Institute of Scientific and Technical Information of China (English)

    王中鹏

    2012-01-01

    In this paper, we describe radio-on-fiber passive optical network (ROF-PON). This is an optical wireless access networks that has a cognitive radio system architecture. In this network, the fiber directly transmits the radio frequency signal. The optical layer uses wave-division multiplexing passive optical network (WDM-PON) technology. The sensing information is transmitted to the central office (CO) by the remote end of the optical network unit and is then processed by the cognitive radio. Spectrum sensing and channel access technology are processed in the CO, so the complexity of system is reduced. This proposed system architecture makes full use of radio frequency over fiber and cognitive radio in the spectrum management.%文章提出了基于认知无线电的光纤无线通信系统-无源光网络(ROF-PON)光无线接入网络系统结构.该方案光纤中直接传输射频信号.光层可采用波分复用-无源光网络(WDM-PON)技术(也可以是一个定制的光接入层).远端的光网络单元(ONU)将得到的传感信息回传到中心局(CO),应用认知无线电技术进行处理.频谱感知和信道接入等都在CO处理,降低了整个系统的复杂度,发挥了光纤无线通信系统(ROF)的优势,也发挥了认知无线电在管理频谱方面的特长.

  2. K. C. Yeh: Radio Science Editor

    Science.gov (United States)

    Advances in satellite technology and computer science have had the greatest impact on radio science in the last quarter century, according to Kung Chie Yeh, the new editor of Radio Science. Yeh, whose term began July 1 (Eos, April 12, 1983, p. 137, February 22, 1983, p. 73), is a professor in the electrical engineering department at the University of Illinois at Urbana-Champaign.An international authority on ionospheric radio physics, Yeh also is known for his work on trans-ionospheric radio wave propagation as it affects earth-space communications and satellite navigation. Hehas been studying radio science for nearly 30 years.

  3. Digitale radio

    NARCIS (Netherlands)

    Schiphorst, Roel; Zondervan, L.

    2007-01-01

    Als eerste in Europa heeft Nederland begin december 2006 de omschakeling van analoge naar digitale ethertelevisie gemaakt. Voor de analoge FM-radio is er ook een digitale variant, T-DAB. T-DAB staat voor 'Terrestrial Digital Audio Broadcasting'. Dit artikel gaat verder in op deze techniek en de veld

  4. Teaching radio astronomy with Affordable Small Radio Telescope (ASRT)

    Science.gov (United States)

    Joshi, Bhal Chandra

    A simple, easy to build and portable radio telescope, called Affordable Small Radio Telescope (ASRT), has been developed by the Radio Physics Laboratory (RPL), a radio astronomy teaching unit associated with the National Centre for Radio Astrophysics (TIFR) and Inter-University Centre for Astronomy and Astrophysics (IUCAA), which are two premier astronomy institutes in India. ASRT consists of off-the-shelf available Direct to Home television dishes and is easy to assemble. Our design is scalable from simple very low cost telescope to more complex yet moderately costing instrument. ASRT provides a platform for demonstrating radio physics concepts through simple hands-on experiment as well as for carrying out solar monitoring by college/University students. The presentation will highlight the concept of ASRT and the different experiments that can be carried out using it. The solar monitoring observations will be discussed along-with details of methods for calibrating these measurements. The pedagogical usefulness of ASRT in introducing undergraduatephysics students to astrophysics, measurements and analysis methods used in radio astronomy will also be discussed. Use of ASRT in the last three years in the programs of RPL, namely the annual Radio Astronomy Winter School for College students (RAWSC) and Pulsar Observing for Students (POS) is also presented. This year a new program was initiated to form a virtual group of an ASRT community, which will not only share their measurements, but also think of improving the pedagogical usefulness of ASRT by innovative experiments. This initiative is presented with the best practices drawn from our experience in using ASRT as a tool for student training in space sciences. The talk will also point out future ideas in involving a larger body of students in simple radio astronomy experiments with the ASRT, which RPL is likely to nucleate as part of its mandate.

  5. Talk Radio and Television Media with New Media Technology Development%广电媒体如何借助新媒体技术实现融合发展

    Institute of Scientific and Technical Information of China (English)

    王云; 孙茂良

    2015-01-01

    针对新兴媒体所造成的冲击,阐述了广电媒体实现融合发展的必要性,并结合现状,从5个方面探讨了广电媒体如何借助新媒体技术,扩大传播途径和覆盖面,实现与新媒体的融合发展。%In view of some of the impact of new media to traditional media of radio , film and television, radio, film and television media with the help of new media technology is expounded the necessity of integration de -velopment .Combined with the current status of radio and television media , radio and television media is dis-cussed from five aspects how to use the new media technology , expand transmission and coverage , implemen-tation and the development of the new media convergence problem .

  6. 科技创新助力广播影视公共服务体系建设%Scientific and technological innovation to promote the construction of radio and television public service system

    Institute of Scientific and Technical Information of China (English)

    赵颖

    2013-01-01

      广播影视一直是高科技、重装备的行业,在科学技术不断革新的影响下,文章以南宁市为例,对科技创新给广播影视行业在新的历史时期实现新的定位,把握新的机遇以及通过运用高新技术成果,广播影视行业逐步开展广播影视公共服务体系的搭建,提升文化的传播力与服务力,提高全民文化素质等进行了思考。%Radio, Film and Television has been a high-tech, heavy equipment industry. Under the influence of science and technology innovation, Nanning City as an example, to the radio and television industry on scientific and technological innovation in the new historical period to achieve a new position, grasp the impact of the new opportunities, as well as through the use of high-tech the achievements, radio, film and television industry gradually carry out the structures of radio and television public service system, enhance the spread of culture and services, improve the quality of the shallow thinking.

  7. FOREWORD: Radio and Antenna Days of the Indian Ocean (RADIO 2012)

    Science.gov (United States)

    Monebhurrun, Vikass; Lesselier, Dominique

    2013-04-01

    It was an honor and a great pleasure for all those involved in its organization to welcome the participants to the 'Radio and Antenna Days of the Indian Ocean' (RADIO 2012) international conference that was held from 24th to 27th September 2012 at the Sugar Beach Resort, Wolmar, Flic-en-Flac, Mauritius. RADIO 2012 is the first of a series of conferences that is to be regularly organized in the Indian Ocean region. The aim is to discuss recent developments, theories and practical applications covering the whole scope of radio-frequency engineering, including radio waves, antennas, propagation, and electromagnetic compatibility. Following discussions with engineers and scientists from the countries of the Indian Ocean as well as from other parts of the world, a need was felt for the organization of such an international event in this region. The Island of Mauritius, worldwide known for its white sandy beaches and pleasant tropical atmosphere, provided an excellent environment for the organization of the 1st RADIO international conference. The Local Organizing Committee consisted of scientists from SUPELEC, the University of Mauritius, and the University of Technology, Mauritius. Various members of staff of the University of Mauritius provided help for the organization of the conference. The International Union of Radio Science (URSI) made available technical and financial sponsorship for partial support of young scientists. A number of companies also supported RADIO 2012 ('Platinum': GSMA, ICTA & MMF, 'Gold': CST & FEKO). The event itself was organized in a premier hotel on Mauritius. In this foreword, we would like to take the opportunity again to thank all the people, institutions and companies that made the event such a success. More than 120 abstracts were submitted to the conference and were peer-reviewed by an international scientific committee. RADIO 2012 overall featured six oral sessions, one poster session and two workshops. Three internationally recognized

  8. The Factors Influencing the Development of Radio Frequency Identification Technology in E-Supply Chain Management (Case study: Iran Khodro Industrial Group (IKCO

    Directory of Open Access Journals (Sweden)

    Ali Sanayei

    2011-07-01

    The application of Radio Frequency Identification (RFID for the purpose of tracking each single part in the automotive supply chain management has become very crucial in recent years. In this study, the factors influencing the development of RFID in Iran Khodro Industrial Group as well as their weight and ranking are evaluated. It is notewothy that the Lin framework factors have been used as the basis of this research. The Fuzzy Delphi, Delphi, and Fuzzy Analytic Hierarchy Process (FAHP methods were applied for the research three stages. In the first stage, three of the Lin framework factors were rejected and replaced with seven more new factors. In the second stage, after three times performance of Delphi method, the dimension of each of the new seven factors was recognized, and finally in the third stage, the weight and ranking of factors and dimensions which influence the RFID development in supply chain management in our case study, Iran Khodro Company, was calculated. The results of the research have shown that the International Standard and Specification dimension has the highest weight among other influential dimensions. Also, the dimensions of Security, Cost, Infrastructure, Technology, and other factors have respectively the next highest weight after the International Standard and Specification dimension

  9. Evaluation of call options

    Institute of Scientific and Technical Information of China (English)

    陈道平

    2002-01-01

    The European and American call options,for which the prices of their underlying asset follow compound Poisson process,are evaluated by a probability method.Formulas that can be used to evaluate the options are obtained,which include not only the elements of an option:the price of the call option,the exercise price and the expiration date,but also the riskless interest rate,nevertheless exclude the volatility of the underlying asset.In practice,the evaluated results obtained by these formulas can proved references of making strategic decision for an investor who buys the call option and a company who sells the call option.

  10. Radio Frequency Based Water Level Monitor and Controller for ...

    African Journals Online (AJOL)

    Radio Frequency Based Water Level Monitor and Controller for Residential Applications. ... Nigerian Journal of Technology ... This paper elucidates a radio frequency (RF) based transmission and reception system used to remotely monitor ...

  11. Expanded radio art as PhD practice

    OpenAIRE

    Hall, M.

    2015-01-01

    Radio After Radio: Redefining Radio Art in the Light of New Media Technology through Expanded Practice is the title of my PhD practice based research. This paper focuses on the extended boundaries of radio art, considering how radio art might be defined in relation to sound art, music, and media art. Mapping the shifting parameters of radio art in the digital era has prompted a consideration of how radio can be seen to be moving from being a predominantly shared "live" event to one consumed "...

  12. Effects of RFID Technology on the Logistics Innovation

    OpenAIRE

    金, 双鴿; Shuangge, JIN

    2010-01-01

    An advanced automatic identification technology based on the Radio Frequency Identification (RFID) technology has significant value for inventory systems. RFID tag is a microchip combined with an antenna in a compact package and is called also IC tag. Other benefits of using RFID include the reduction of labor costs, the simplification of business processes, and the reduction of inventory inaccuracies. This paper aims to analyse the effects of RFID technology on the logistics innovation.

  13. 76 FR 2712 - Sara Lee Corporation, Master Data, Cash Applications, Deductions, Collections, Call Center...

    Science.gov (United States)

    2011-01-14

    ..., Collections, Call Center, Information Technology, Accounts Payable, General Accounts, Financial Accounts..., Collections, Call Center, Information Technology, Accounts Payable, General Accounts, Financial Accounting..., Deductions, Collections, Call Center, Information Technology, Accounts Payable, General Accounts,......

  14. The Radio JOVE Project - Shoestring Radio Astronomy

    Science.gov (United States)

    Thieman, J.; Flagg, R.; Greenman, W.; Higgins, C.; Reyes, F.; Sky, J.

    2010-01-01

    Radio JOVE is an education and outreach project intended to give students and other interested individuals hands-on experience in learning radio astronomy. They can do this through building a radio telescope from a relatively inexpensive kit that includes the parts for a receiver and an antenna as well as software for a computer chart recorder emulator (Radio Skypipe) and other reference materials

  15. The Radio JOVE Project - Shoestring Radio Astronomy

    Science.gov (United States)

    Thieman, J.; Flagg, R.; Greenman, W.; Higgins, C.; Reyes, F.; Sky, J.

    2010-01-01

    Radio JOVE is an education and outreach project intended to give students and other interested individuals hands-on experience in learning radio astronomy. They can do this through building a radio telescope from a relatively inexpensive kit that includes the parts for a receiver and an antenna as well as software for a computer chart recorder emulator (Radio Skypipe) and other reference materials

  16. Callings and Organizational Behavior

    Science.gov (United States)

    Elangovan, A. R.; Pinder, Craig C.; McLean, Murdith

    2010-01-01

    Current literature on careers, social identity and meaning in work tends to understate the multiplicity, historical significance, and nuances of the concept of calling(s). In this article, we trace the evolution of the concept from its religious roots into secular realms and develop a typology of interpretations using occupation and religious…

  17. Dimensioning large call centers

    NARCIS (Netherlands)

    S.C. Borst (Sem); A. Mandelbaum; M.I. Reiman

    2000-01-01

    textabstractWe develop a framework for asymptotic optimization of a queueing system. The motivation is the staffing problem of call centers with 100's of agents (or more). Such a call center is modeled as an M/M/N queue, where the number of agents~$N$ is large. Within our framework, we determine the

  18. Callings and Organizational Behavior

    Science.gov (United States)

    Elangovan, A. R.; Pinder, Craig C.; McLean, Murdith

    2010-01-01

    Current literature on careers, social identity and meaning in work tends to understate the multiplicity, historical significance, and nuances of the concept of calling(s). In this article, we trace the evolution of the concept from its religious roots into secular realms and develop a typology of interpretations using occupation and religious…

  19. Making telephone calls

    Institute of Scientific and Technical Information of China (English)

    任民

    2007-01-01

    @@ 1.常见用语 a.请找某人接电话 Hello!May/Could/Can I speak to…,please? b.问对方是不是某人 Is that…(speaking)? c.问对方是谁 1)Who's speaking(calling)? 2)Who's that(speaking/calling)?

  20. Final report for the Chautauqua Radio Workshop Project. July 1, 1980-October 30, 1981

    Energy Technology Data Exchange (ETDEWEB)

    Renz, B.

    1982-01-25

    Energy conservation education must reach millions of Americans in order to see any real and immediate decrease in energy consumption. Since our society gets much of its information from the media, this seems like a most effective vehicle for disseminating energy conservation information to the American Public. Radio is listened to by the vast majority of Americans each day of their lives. Radio as a communications medium is an extremely cost effective method of mass communication and education, and is perceived as a personal medium which has great potential to affect a change in the daily energy consumption habits of the public. Call-in radio programs centering around energy conservation are an effective method of presenting informative, energy education programming that provide instantaneous access for listener/consumer participation. The linking of available telephone and radio technology (via call-in radio shows) allows people all over the US, including remote rural areas, access to the latest energy conservation information and renewable energy technolgy.

  1. To Kill the Blackboard? Technology in Language Teaching and Learning

    Science.gov (United States)

    Koksal, Dinçay

    2004-01-01

    In language teaching and learning, we have a lot to choose from the world of technology: radio, TV, CD-Rom, computers, C.A.L.L., the Internet, Electronic Dictionary, e-mail, audio cassettes, Power-point, and videos/DVDs or VCDs. Table 1 in Appendix C illustrates their advantages and disadvantages. This paper aims to discuss the use and importance…

  2. Relationships between range access as monitored by radio frequency identification technology, fearfulness, and plumage damage in free-range laying hens.

    Science.gov (United States)

    Hartcher, K M; Hickey, K A; Hemsworth, P H; Cronin, G M; Wilkinson, S J; Singh, M

    2016-05-01

    Severe feather-pecking (SFP), a particularly injurious behaviour in laying hens (Gallus gallus domesticus), is thought to be negatively correlated with range use in free-range systems. In turn, range use is thought to be inversely associated with fearfulness, where fearful birds may be less likely to venture outside. However, very few experiments have investigated the proposed association between range use and fearfulness. This experiment investigated associations between range use (time spent outside), fearfulness, plumage damage, and BW. Two pens of 50 ISA Brown laying hens (n=100) were fitted with radio frequency identification (RFID) transponders (contained within silicone leg rings) at 26 weeks of age. Data were then collected over 13 days. A total of 95% of birds accessed the outdoor run more than once per day. Birds spent an average duration of 6.1 h outside each day over 11 visits per bird per day (51.5 min per visit). The top 15 and bottom 15 range users (n=30), as determined by the total time spent on the range over 13 days, were selected for study. These birds were tonic immobility (TI) tested at the end of the trial and were feather-scored and weighed after TI testing. Birds with longer TI durations spent less time outside (P=0.01). Plumage damage was not associated with range use (P=0.68). The small group sizes used in this experiment may have been conducive to the high numbers of birds utilising the outdoor range area. The RFID technology collected a large amount of data on range access in the tagged birds, and provides a potential means for quantitatively assessing range access in laying hens. The present findings indicate a negative association between fearfulness and range use. However, the proposed negative association between plumage damage and range use was not supported. The relationships between range use, fearfulness, and SFP warrant further research.

  3. Real-time monitoring for detection of retained surgical sponges and team motion in the surgical operation room using radio-frequency-identification (RFID) technology: a preclinical evaluation.

    Science.gov (United States)

    Kranzfelder, Michael; Zywitza, Dorit; Jell, Thomas; Schneider, Armin; Gillen, Sonja; Friess, Helmut; Feussner, Hubertus

    2012-06-15

    Technical progress in the surgical operating room (OR) increases constantly, facilitating the development of intelligent OR systems functioning as "safety backup" in the background of surgery. Precondition is comprehensive data retrieval to identify imminent risky situations and inaugurate adequate security mechanisms. Radio-frequency-identification (RFID) technology may have the potential to meet these demands. We set up a pilot study investigating feasibility and appliance reliability of a stationary RFID system for real-time surgical sponge monitoring (passive tagged sponges, position monitoring: mayo-stand/abdominal situs/waste bucket) and OR team tracking (active transponders, position monitoring: right/left side of OR table). In vitro: 20/20 sponges (100%) were detected on the mayo-stand and within the OR-phantom, however, real-time detection accuracy declined to 7/20 (33%) when the tags were moved simultaneously. All retained sponges were detected correctly. In vivo (animal): 7-10/10 sterilized sponges (70%-100%) were detected correctly within the abdominal cavity. OR-team: detection accuracy within the OR (surveillance antenna) and on both sides of the OR table (sector antenna) was 100%. Mean detection time for position change (left to right side and contrariwise) was 30-60 s. No transponder failure was noted. This is the first combined RFID system that has been developed for stationary use in the surgical OR. Preclinical evaluation revealed a reliable sponge tracking and correct detection of retained textiles (passive RFID) but also demonstrated feasibility of comprehensive data acquisition of team motion (active RFID). However, detection accuracy needs to be further improved before implementation into the surgical OR. Copyright © 2012 Elsevier Inc. All rights reserved.

  4. Radio frequency sensing measurements and methods for location classification in wireless networks

    Science.gov (United States)

    Maas, Dustin C.

    The wireless radio channel is typically thought of as a means to move information from transmitter to receiver, but the radio channel can also be used to detect changes in the environment of the radio link. This dissertation is focused on the measurements we can make at the physical layer of wireless networks, and how we can use those measurements to obtain information about the locations of transceivers and people. The first contribution of this work is the development and testing of an open source, 802.11b sounder and receiver, which is capable of decoding packets and using them to estimate the channel impulse response (CIR) of a radio link at a fraction of the cost of traditional channel sounders. This receiver improves on previous implementations by performing optimized matched filtering on the field-programmable gate array (FPGA) of the Universal Software Radio Peripheral (USRP), allowing it to operate at full bandwidth. The second contribution of this work is an extensive experimental evaluation of a technology called location distinction, i.e., the ability to identify changes in radio transceiver position, via CIR measurements. Previous location distinction work has focused on single-input single-output (SISO) radio links. We extend this work to the context of multiple-input multiple-output (MIMO) radio links, and study system design trade-offs which affect the performance of MIMO location distinction. The third contribution of this work introduces the "exploiting radio windows" (ERW) attack, in which an attacker outside of a building surreptitiously uses the transmissions of an otherwise secure wireless network inside of the building to infer location information about people inside the building. This is possible because of the relative transparency of external walls to radio transmissions. The final contribution of this dissertation is a feasibility study for building a rapidly deployable radio tomographic (RTI) imaging system for special operations forces

  5. Analisis Propagasi Gelombang Radio Menggunakan DLink 624 pada Jurusan Teknik Elektro Universitas Syiah Kuala

    Directory of Open Access Journals (Sweden)

    . Syahrial

    2012-10-01

    Full Text Available Telecommunication technology nowadays tries to implement Personal Communication System (PCS which has Personal Mobility (PM and Terminal Mobility (TM. PCS can be define as radio technology that uses Radio Frequency (RF as a transmission medium, which is small and light, and can be implemented indoor and outdoor. One equipment that implements this technology is called D-Link. The application of D-Link is to communicate among users either indoor or outdoor. Research methodology includes deciding the parameters and calculating the path loss between base station and portable station at the second floor of Electrical Engineering Department Syiah Kuala University. The final result was that the communication between the base station and portable station in the rooms at the second floor could exist but the process is rather slow and can experience discontinuity. Those were happenbecause the receiver’s power was below the threshold of the portable station level, i.e.. -40 dB.

  6. A Telephone Call

    Institute of Scientific and Technical Information of China (English)

    王晓兰

    2004-01-01

    At about two o'clock on a cold winter morning, a doctor drove seven miles in answer to a telephone call. On his coming the man who had called him in said, “Doctor, I don't have a sore throat, I don't cough.I have no pain either in the side or in the back, I'm not running a temperature, but still I feel that death is near.”

  7. Radio Searches for Signatures of Advanced Extraterrestrial Life

    Science.gov (United States)

    Siemion, Andrew

    Over the last several decades, observational astronomy has produced a flood of discoveries that suggest that the building blocks and circumstances that gave rise to life on Earth may be the rule rather than the exception. It has now been conclusively shown that planets are common and that some 5-15% of FGKM stars host planets existing in their host star's habitable zone. Further, terrestrial biology has demonstrated that life on our own planet can thrive in extraordinarily extreme environments, dramatically extending our notion of what constitutes habitability. The deeper question, yet unanswered, is whether or not life in any form has ever existed in an environment outside of the Earth. As humans, we are drawn to an even more profound question, that of whether or not extraterrestrial life may have evolved a curiosity about the universe similar to our own and the technology with which to explore it. Radio astronomy has long played a prominent role in searches for extraterrestrial intelligence (SETI), beginning with the first suggestions by Cocconi and Morrison (1959) that narrow-band radio signals near 1420 MHz might be effective tracers of advanced technology and early experiments along these lines by Frank Drake in 1961, continuing through to more recent investigations searching for several types of coherent radio signals indicative of technology at a wider range of frequencies. The motivations for radio searches for extraterrestrial intelligence have been throughly discussed in the literature, but the salient arguments are the following: 1. coherent radio emission is commonly produced by advanced technology (judging by Earth’s technological development), 2. electromagnetic radiation can convey information at the maximum velocity currently known to be possible, 3. radio photons are energetically cheap to produce, 4. certain types of coherent radio emissions are easily distinguished from astrophysical background sources, especially within the so-called

  8. Spectrum access games for cognitive radio networks

    CSIR Research Space (South Africa)

    Masonta, MT

    2010-09-01

    Full Text Available Cognitive Radio (CR) is seen as a key enabling technology for addressing current under-utilization and inefficient use of radio frequency spectrum. The use of CR will see most of the spectrum white spaces being used opportunistically without causing...

  9. Radio access selection in multi-radio access systems

    NARCIS (Netherlands)

    Jorgušeski, L.; Litjens, R.; Zhiyi, C.; Nikookar, H.

    2007-01-01

    Future wireless access systems will be characterized by their heterogeneity from technological point of view. It is envisaged that in certain areas end-users will have a choice between various radio accesses (RAs) such as e.g. classical cellular networks (GSM, UMTS, WiMAX, etc), WLAN hot-spots, or o

  10. Assessing call centers’ success:

    Directory of Open Access Journals (Sweden)

    Hesham A. Baraka

    2013-07-01

    This paper introduces a model to evaluate the performance of call centers based on the Delone and McLean Information Systems success model. A number of indicators are identified to track the call center’s performance. Mapping of the proposed indicators to the six dimensions of the D&M model is presented. A Weighted Call Center Performance Index is proposed to assess the call center performance; the index is used to analyze the effect of the identified indicators. Policy-Weighted approach was used to assume the weights with an analysis of different weights for each dimension. The analysis of the different weights cases gave priority to the User satisfaction and net Benefits dimension as the two outcomes from the system. For the input dimensions, higher priority was given to the system quality and the service quality dimension. Call centers decision makers can use the tool to tune the different weights in order to reach the objectives set by the organization. Multiple linear regression analysis was used in order to provide a linear formula for the User Satisfaction dimension and the Net Benefits dimension in order to be able to forecast the values for these two dimensions as function of the other dimensions

  11. [Personal emergency call system based on human vital and system technical parameters in a Smart Home environment].

    Science.gov (United States)

    Hampicke, M; Schadow, B; Rossdeutscher, W; Fellbaum, K; Boenick, U

    2002-11-01

    Progress in microtechnology and radio transmission technology has enabled the development of highly reliable emergency-call systems. The present article describes systems that have been specially designed to improve the safety and independence of handicapped and elderly persons living at home. For such persons immediate help in an emergency situation is of crucial importance. The technical state of the art of emergency-call systems specially developed for use by the elderly, is briefly discussed, in particular the well-known radio emergency-call button, with the aid of which an alarm can be activated manually. This system, however, does not offer adequate safety in all emergency situations. Alternative or complementary systems designed to automatically trigger an alarm on the basis of the recording and evaluation of so-called vital parameters, are therefore proposed. In addition, in a smart-home environment with networked devices, further parameters--so-called environment parameters can be used. It is found that the identification of an emergency situation becomes more reliable as the number of parameters employed increases.

  12. Radio communications with extra-terrestrial civilizations

    Science.gov (United States)

    Kotelnikov, V. A.

    1974-01-01

    Communications between civilizations within our galaxy at the present level of radio engineering is possible, although civilizations must begin to search for each other to achieve this. If an extra-terrestrial civilization possessing a technology at our level wishes to make itself known and will transmit special radio signals to do this, then it can be picked up by us at a distance of several hundreds of light years using already existing radio telescopes and specially built radio receivers. If it wishes, this civilization can also send us information without awaiting our answer.

  13. FeltRadio: Sensing and Making Sense of Wireless Traffic

    DEFF Research Database (Denmark)

    Gronvall, Erik; Fritsch, Jonas; Vallgårda, Anna

    2016-01-01

    Radio waves surround us but still they remain largely undetected by our senses. Unless we use specifically tuned hardware, such as FM radios, cell phones or WiFi modems, human beings cannot perceive wirelessly transmitted data. This paper presents FeltRadio, a portable and wireless technology...... that makes it possible to turn radio signals into visual and tactile stimuli as a form of sensorial augmentation. FeltRadio explores and makes us reflect upon what it would be like if we could sense, and feel, wireless traffic such as WiFi or Bluetooth. We present the technological design behind Felt......Radio and the outcome of two exploratory studies with the technology focused on people's experience of being able to suddenly sense and make sense of wireless traffic. We discuss the possible qualities of this embodied experience of FeltRadio and point to future experiments with the technology....

  14. Radio Frequency Identification

    Indian Academy of Sciences (India)

    V Rajaraman

    2017-06-01

    Radio Frequency Identification (RFID) has been around sinceearly 2000. Its use has currently become commonplace as thecost of RFID tags has rapidly decreased. RFID tags have alsobecome more ‘intelligent’ with the incorporation of processorsand sensors in them. They are widely used now in manyinnovative ways. RFIDs are an integral part of Internet ofThings (IOT) and IT systems of smart cities. In this article,we introduce the technology used by RFID systems, illustratetheir use in several applications, and discuss problems of privacyand security when they are used.

  15. 基于 WindChill/PDMLink 零件调用的关键技术%The key technology of the parts calling based on WindChill/PDMLink

    Institute of Scientific and Technical Information of China (English)

    张守海; 鞠全勇; 杨亚东

    2015-01-01

    在 Creo/Parametric 和 WindChill/PDMLink 无缝集成的 CAD 技术共享平台下,通过加载Creo/TOOLKIT应用程序以不同方式调用PDMLink中的标准件和常用件。以螺钉为例,阐述动态获取3 D零件信息的方法,并添加至装配体。以秤脚为实例,阐述Creo/TOOLKIT融合Pro/Pro-gram的混合技术调用参数化模型。工程应用实例表明,该技术降低了设计者的劳动强度,能有效提高工作效率。%Based on the sharing technology of CAD platform and Creo/parametric connecting to WindChill/PDM Link, it realizes various ways via running the Creo/TOOLKIT and the standard common parts calling from PDM Link .Taking a screw as an example , it illustrates the key technologies of showing the information of 3 D dynami-cally, and adding the one to assemble .In addition,it builds the model of scale feet , explains the method of Pro/Program combined with Creo/TOOLKIT in terms of parametric model .The engineering applications show that the technologies can improve the efficiency and reduce the work intensity .

  16. Call Center Capacity Planning

    DEFF Research Database (Denmark)

    Nielsen, Thomas Bang

    in modern call centers allows for a high level of customization, but also induces complicated operational processes. The size of the industry together with the complex and labor intensive nature of large call centers motivates the research carried out to understand the underlying processes. The customizable...... groups are further analyzed. The design of the overflow policies is optimized using Markov Decision Processes and a gain with regard to service levels is obtained. Also, the fixed threshold policy is investigated and found to be appropriate when one class is given high priority and when it is desired...

  17. Reconfigurable Power-Aware EVA Radio Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Advanced Extra Vehicular Activity (EVA) radio system is a pivotal technology for the successful support of the International Space Station beyond 2020 and future...

  18. CALLING AQUARIUM LOVERS...

    CERN Multimedia

    2002-01-01

    CERN's anemones will soon be orphans. We are looking for someone willing to look after the aquarium in the main building, for one year. If you are interested, or if you would like more information, please call 73830. (The anemones living in the aquarium thank you in anticipation.)

  19. A call for surveys

    DEFF Research Database (Denmark)

    Bernstein, Philip A.; Jensen, Christian S.; Tan, Kian-Lee

    2012-01-01

    The database field is experiencing an increasing need for survey papers. We call on more researchers to set aside time for this important writing activity. The database field is growing in population, scope of topics covered, and the number of papers published. Each year, thousands of new papers...

  20. A call for surveys

    DEFF Research Database (Denmark)

    Bernstein, Philip A.; Jensen, Christian S.; Tan, Kian-Lee

    2012-01-01

    The database field is experiencing an increasing need for survey papers. We call on more researchers to set aside time for this important writing activity. The database field is growing in population, scope of topics covered, and the number of papers published. Each year, thousands of new papers ...

  1. Joint radio and optical observations of the most radio-powerful intracloud lightning discharges

    Directory of Open Access Journals (Sweden)

    A. R. Jacobson

    2013-03-01

    Full Text Available The most radio-powerful intracloud lightning emissions are associated with a phenomenon variously called "narrow bipolar events" or "compact intracloud discharges". This article examines in detail the coincidence and timing relationship between, on the one hand, the most radio-powerful intracloud lightning events and, on the other hand, optical outputs (or lack thereof of the same discharge process. This is done, first, using coordinated very high frequency (VHF and optical observations from the FORTE satellite and, second, using coordinated sferic and all-sky optical observations from the Los Alamos Sferic Array. In both cases, it is found that the sought coincidences are exceedingly rare. Moreover, in the handful of coincidences between optical and intense radio emissions that have been identified, the radio emissions differ from their usual behavior, by being accompanied by approximately simultaneous "conventional" lightning radio emissions. It is implied that the most radio-powerful intracloud emission process essentially differs from ordinary incandescent lightning.

  2. Position paper: cognitive radio networking for multiple sensor network interoperability in mines

    CSIR Research Space (South Africa)

    Kagize, BM

    2008-01-01

    Full Text Available This paper proposes the use of cognitive radio technology for multiple wireless sensor technologies in mines. The work is motivated by the lack of flexible and scalable sensor networks in mines. The proposed architecture uses cognitive radio...

  3. 省地一体化客户呼叫中心设计与关键技术研究%Is the integration of customer call center design and key technology research

    Institute of Scientific and Technical Information of China (English)

    撒兴杰

    2015-01-01

    随着经济的飞速发展,生活、生产用电需求不断增加,95598呼叫中心作为电网公司对外服务的统一窗口,系统平台的可靠性至关重要.文章对贵州电网省地一体化95598呼叫中心进行了总体设计,并对其中的关键技术进行深入研究和实现,确保系统的稳定可靠,提高系统的服务质量.%with the rapid development of economy, production and life, the demand for electricity continues to increase, 95598 call center as a foreign power grid company unified window, the system reliability is very important. The of Guizhou power grid of province and region integration 95598 call center were overall design, and implement of the key technology research and im-plementation, to ensure that the system is stable and reliable, and improve the service quality of the system.

  4. Cognitive Radio RF: Overview and Challenges

    Directory of Open Access Journals (Sweden)

    Van Tam Nguyen

    2012-01-01

    Full Text Available Cognitive radio system (CRS is a radio system which is aware of its operational and geographical environment, established policies, and its internal state. It is able to dynamically and autonomously adapt its operational parameters and protocols and to learn from its previous experience. Based on software-defined radio (SDR, CRS provides additional flexibility and offers improved efficiency to overall spectrum use. CRS is a disruptive technology targeting very high spectral efficiency. This paper presents an overview and challenges of CRS with focus on radio frequency (RF section. We summarize the status of the related regulation and standardization activities which are very important for the success of any emerging technology. We point out some key research challenges, especially implementation challenges of cognitive radio (CR. A particular focus is on RF front-end, transceiver, and analog-to-digital and digital-to-analog interfaces which are still a key bottleneck in CRS development.

  5. 2nd Radio and Antenna Days of the Indian Ocean (RADIO 2014)

    Science.gov (United States)

    2014-10-01

    It was an honor and a great pleasure for all those involved in its organization to welcome the participants to the ''Radio and Antenna Days of the Indian Ocean'' (RADIO 2014) international conference that was held from 7th to 10th April 2014 at the Sugar Beach Resort, Wolmar, Flic-en-Flac, Mauritius. RADIO 2014 is the second of a series of conferences organized in the Indian Ocean region. The aim of the conference is to discuss recent developments, theories and practical applications covering the whole scope of radio-frequency engineering, including radio waves, antennas, propagation, and electromagnetic compatibility. The RADIO international conference emerged following discussions with engineers and scientists from the countries of the Indian Ocean as well as from other parts of the world and a need was felt for the organization of such an event in this region. Following numerous requests, the Island of Mauritius, worldwide known for its white sandy beaches and pleasant tropical atmosphere, was again chosen for the organization of the 2nd RADIO international conference. The conference was organized by the Radio Society, Mauritius and the Local Organizing Committee consisted of scientists from SUPELEC, France, the University of Mauritius, and the University of Technology, Mauritius. We would like to take the opportunity to thank all people, institutions and companies that made the event such a success. We are grateful to our gold sponsors CST and FEKO as well as URSI for their generous support which enabled us to partially support one PhD student and two scientists to attend the conference. We would also like to thank IEEE-APS and URSI for providing technical co-sponsorship. More than hundred and thirty abstracts were submitted to the conference. They were peer-reviewed by an international scientific committee and, based on the reviews, either accepted, eventually after revision, or rejected. RADIO 2014 brought together participants from twenty countries spanning

  6. Flight calls and orientation

    DEFF Research Database (Denmark)

    Larsen, Ole Næsbye; Andersen, Bent Bach; Kropp, Wibke

    2008-01-01

    flight calls was simulated by sequential computer controlled activation of five loudspeakers placed in a linear array perpendicular to the bird's migration course. The bird responded to this stimulation by changing its migratory course in the direction of that of the ‘flying conspecifics' but after about......  In a pilot experiment a European Robin, Erithacus rubecula, expressing migratory restlessness with a stable orientation, was video filmed in the dark with an infrared camera and its directional migratory activity was recorded. The flight overhead of migrating conspecifics uttering nocturnal...... 30 minutes it drifted back to its original migration course. The results suggest that songbirds migrating alone at night can use the flight calls from conspecifics as additional cues for orientation and that they may compare this information with other cues to decide what course to keep....

  7. Calling Dunbar's Numbers

    CERN Document Server

    MacCarron, Pádraig; Dunbar, Robin

    2016-01-01

    The social brain hypothesis predicts that humans have an average of about 150 relationships at any given time. Within this 150, there are layers of friends of an ego, where the number of friends in a layer increases as the emotional closeness decreases. Here we analyse a mobile phone dataset, firstly, to ascertain whether layers of friends can be identified based on call frequency. We then apply different clustering algorithms to break the call frequency of egos into clusters and compare the number of alters in each cluster with the layer size predicted by the social brain hypothesis. In this dataset we find strong evidence for the existence of a layered structure. The clustering yields results that match well with previous studies for the innermost and outermost layers, but for layers in between we observe large variability.

  8. Flight calls and orientation

    DEFF Research Database (Denmark)

    Larsen, Ole Næsbye; Andersen, Bent Bach; Kropp, Wibke

    2008-01-01

      In a pilot experiment a European Robin, Erithacus rubecula, expressing migratory restlessness with a stable orientation, was video filmed in the dark with an infrared camera and its directional migratory activity was recorded. The flight overhead of migrating conspecifics uttering nocturnal...... flight calls was simulated by sequential computer controlled activation of five loudspeakers placed in a linear array perpendicular to the bird's migration course. The bird responded to this stimulation by changing its migratory course in the direction of that of the ‘flying conspecifics' but after about...... 30 minutes it drifted back to its original migration course. The results suggest that songbirds migrating alone at night can use the flight calls from conspecifics as additional cues for orientation and that they may compare this information with other cues to decide what course to keep....

  9. Space Telecommunications Radio System (STRS) Definitions and Acronyms

    Science.gov (United States)

    Briones, Janette C.; Handler, Louis M.; Johnson, Sandra K.; Nappier, Jennifer; Gnepp, Steven; Kacpura, Thomas J.; Reinhart, Richard C.; Hall, Charles S.; Mortensen, Dale

    2008-01-01

    Software-defined radio is a relatively new technology area, and industry consensus on terminology is not always consistent. Confusion exists when the various organizations and standards bodies define different radio terms associated with the actual amount of reconfigurability of the radios. The Space Telecommunications Radio System (STRS) Definitions and Acronyms Document provides the readers of the STRS documents a common understanding of the terminology used and how they will be applied to the STRS architecture.

  10. Call centres: constructing flexibility

    OpenAIRE

    Arzbächer, Sandra; Holtgrewe, Ursula; Kerst, Christian

    2002-01-01

    "The development of call centres as a flexible interface between firms and their environments has been seen as exemplary or even symptomatic of flexible capitalism (Sennett 1998). We are going to point out that they do not just stand for organisational change but also for changes of institutions towards deregulation. Employers and managers hoped for gains of flexibility, decreasing labour costs, and market gains by an expanded 24-hour-service. Surveillance and control by flexib...

  11. Radio Station Digital Audio Database Automatic Annotation and Retrieval Technology%广播电台数字音频资料库的自动标注及检索技术研究

    Institute of Scientific and Technical Information of China (English)

    王晓艳; 梁晋春; 姚颖颖; 马艳

    2013-01-01

    With the development of broadcasting,audio data of radio has been dramatically increased,the demands of automation and efficiem retrieval in the program content management of radio station are increasing.Based on the analysis of radio digital audio database construction and problems in content management,this paper focuses on the audio data metadata automatic annotation and retrieval of several key technologies involved,looking forward to the future it can be directly applied to the content management of broadcast programs,and improves work efficiency.%随着广播事业的发展,电台拥有音频数据量急剧增长,电台在节目内容管理自动化及有效检索方面的需求日益增加.在分析广播电台数字音频资料库建设及在内容管理方面问题的基础上,重点介绍音频资料元数据项自动标注及检索涉及的几项关键技术,期望将来能直接应用到广播节目的内容管理上,提高工作效率.

  12. Software defined radio based multi-carrier multi-function waveform for cognitive radio

    Science.gov (United States)

    Zhou, Ruolin; Li, Xue; Chakravarthy, Vasu; Wu, Zhiqiang

    2010-04-01

    In this paper, we demonstrate an adaptive multicarrier multi-function waveform generator for cognitive radio via software defined radio. Using a USRP (universal software radio peripheral) software defined radio boards and GNU radio software, we implement a multi-carrier waveform generator which can generate multi-function waveforms such as OFDM, NC-OFDM, MC-CDMA, NC-MC-CDMA, CI/MC-CDMA, NCCI/ MC-CDMA, TDCS for cognitive radio. Additionally, we demonstrate a portable overlay cognitive radio using this multicarrier multi-function waveform generator. This cognitive radio is capable of detecting primary users in real time and adaptively adjusting its transmission parameters to avoid interference to primary users. More importantly, this cognitive radio can take advantage of multiple spectrum holes by employing non-contiguous multi-carrier transmission technologies. Additionally, we demonstrate that when the primary user transmission changes, the cognitive radio dynamically adjusts its transmission accordingly. We also demonstrate seamless real time video transmission between two cognitive radio nodes, while avoiding interference from primary users and interference to primary users operating in the same spectrum.

  13. ASR performance analysis of an experimental call routing system

    CSIR Research Space (South Africa)

    Modipa, T

    2009-11-01

    Full Text Available Call routing is an important application of Automatic Speech Recognition (ASR) technology. In this paper the authors discuss the main issues affecting the performance of a call routing system and describe the ASR component of the "Auto...

  14. Interactive radio: distance education in the classroom.

    Science.gov (United States)

    1988-01-01

    The Honduran Association for Socioeconomic Growth and Development (AVANCE) in conjunction with the U.S. Agency for International Development's Radio Learning Project has developed and promoted programs for radio that encourage interactive learning in Latin America. The Second Interamerican Conference on Interactive Radio was recently held in Tela, Honduras where educators and participants came to attend workshops on scriptwriting, instructional design, community support and other related topics. The participants had the opportunity to study the second generation of interactive radio. Beginning in 1973, Nicaragua began an interactive radio program written for early grade mathematics students. Currently, Honduras is marketing a mathematics program entitled, La Familia de los Numeros," or the Family of Numbers to other countries. In Bolivia, an organization called, "Fe y Alegria," or Faith and Happiness is broadcasting educational programs through the use of interactive radio. In Ecuador, testing has begun to study the viability of interactive radio for their educational system, and in Costa Rica, replication of Honduras' "Familia de los Numeros" has begun. Teachers have noted an improved grasp of subject matter and better attentiveness through the use of interactive radio programs. The programs present 30 minutes of mathematics information and 30 minutes of language information. For each grade, 170 programs have been developed.

  15. Cognitive Radio Networks From Theory to Practice

    CERN Document Server

    Khattab, Ahmed; Bayoumi, Magdy

    2013-01-01

    This book describes a communication paradigm that could shape the future of wireless communication networks, Opportunistic Spectrum Access (OSA) in Cognitive Radio Networks (CRN).  While several theoretical OSA approaches have been proposed, they are challenged by the practical limitations of cognitive radios: the key enabling technology of OSA.  This book presents an unprecedented formulation of the OSA problem in CNR that takes into account the practical limitations encountered due to existing technologies. Based on such a problem formulation, this book presents a framework and protocol details implementing the analytically-optimized solution of this problem. Unlike the state-of-the-art of CRN implementations that typically target software define radios which are not suitable for real systems, this book describes the implementation of distributed OSA, using practical radio transceiver technologies. It provides a thorough characterization of the gains available to theoretical OSA approaches if the practica...

  16. The RadioSat (sm) network

    Science.gov (United States)

    Noreen, Gary K.

    1991-09-01

    The RadioSat network under development by radio Satellite Corporation will use mobile satellite (MSAT) technology to provide diverse personal communications, broadcast, and navigation services. The network will support these services simultaneously for integrated mobile radios throughout Canada and the United States. The RadioSat network takes advantage of several technological breakthroughs, all coming to fruition by the time the first MSAT satellite is launched in 1994. The most important of these breakthroughs is the enormous radiated power of each MSAT spacecraft - orders of magnitude greater than the radiated power of previous L-band spacecraft. Another important breakthrough is the development of advanced digital audio compression algorithms, enabling the transmission of broadcast quality music at moderate data rates. Finally, continuing dramatic increases in VLSI capabilities permit the production of complex, multi-function mobile satellite radios in very large quantities at prices little more than those of conventional car radios. In addition to performance breakthroughs and their economic implications to RadioSat, the design of the RadioSat network is reviewed.

  17. How Dolphins Call

    Institute of Scientific and Technical Information of China (English)

    马加芬

    2007-01-01

    <正>与人类一样,海豚能通过声音相互称呼"名字"。A high-pitched"wee-o-wee-o-wee-o-wee"whistle might not soundlike much to you,but it6s exactly how a dolphin might introduce itself.Because sight is limited in the ocean,dolphins create individual"name"calls to communicate their whereabouts to friends and families.But it6snot as simple as just recognizing a voice,

  18. Heed the Calls

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    @@ THE bombing of Libya by some of the world's major powers, including France, the United States and Britain brought a new dimension to the protests that have washed over North Africa and the Middle East in the past months.Following the UN Security Council passing the imposition of a no-fly zone over Libyan air-space, a move supported by Nigeria, South Africa and Gabon, air and sea strikes pounded Muammar Gadhafi's strongholds.The AU called for an immediate stop to hostilities on both sides.

  19. Heed the Calls

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    THE bombing of Libya by some of the world’s major powers,including France, the United States and Britain brought a new dimension to the protests that have washed over North Africa and the Middle East in the past months.Following the UN Security Council passing the imposition of a no-fly zone over Libyan air-space,a move supported by Nigeria,South Africa and Gabon,air and sea strikes pounded Muammar Gadhafi’s strongholds.The AU called for an immediate stop to hostilities

  20. Emergency Call Reform

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    China merges several hotline call services in an effort to streamline the urban emergency system Chances are that if you find yourself in a crisis situation in China, dialing the correct emergency number could be a problem. Not because there isn't one, but quite the opposite. China has four main emergency response numbers-110 summons police help in a life-threatening situation, 119 brings out firefighters, 122 gets police activated to sort out traffic accidents and 120 ensures medical help. Along with th...

  1. Care and calls

    DEFF Research Database (Denmark)

    Paasch, Bettina Sletten

    In this thesis, Bettina Sletten Paasch conducts research on the use of mobile work phones in the practices of nurses. On-going demands for efficiency have triggered the implementation of multiple technologies in Danish hospitals. One such technology is mobile phones. With care being a key value...... in nursing, a potential tension arises when nurses have to attend simultaneously to both a patient and a ringing mobile work phone. Using discursive and interactional approaches, this thesis explores if and how nurses are able to enact care during interactions with patients when mobile work phones intervene...

  2. Call Duration Characteristics based on Customers Location

    Directory of Open Access Journals (Sweden)

    Žvinys Karolis

    2014-05-01

    Full Text Available Nowadays a lot of different researches are performed based on call duration distributions (CDD analysis. However, the majority of studies are linked with social relationships between the people. Therefore the scarcity of information, how the call duration is associated with a user's location, is appreciable. The goal of this paper is to reveal the ties between user's voice call duration and the location of call. For this reason we analyzed more than 5 million calls from real mobile network, which were made over the base stations located in rural areas, roads, small towns, business and entertainment centers, residential districts. According to these site types CDD’s and characteristic features for call durations are given and discussed. Submitted analysis presents the users habits and behavior as a group (not an individual. The research showed that CDD’s of customers being them in different locations are not equal. It has been found that users at entertainment, business centers are tend to talk much shortly, than people being at home. Even more CDD can be distorted strongly, when machinery calls are evaluated. Hence to apply a common CDD for a whole network it is not recommended. The study also deals with specific parameters of call duration for distinguished user groups, the influence of network technology for call duration is considered.

  3. An Island Called Cuba

    Directory of Open Access Journals (Sweden)

    Jean Stubbs

    2011-06-01

    Full Text Available Review of: An Island Called Home: Returning to Jewish Cuba. Ruth Behar, photographs by Humberto Mayol. New Brunswick NJ: Rutgers University Press, 2007. xiii + 297 pp. (Cloth US$ 29.95 Fidel Castro: My Life: A Spoken Autobiography. Fidel Castro & Ignacio Ramonet. New York: Scribner/Simon & Schuster, 2008. vii + 724 pp. (Paper US$ 22.00, e-book US$ 14.99 Cuba: What Everyone Needs to Know. Julia E. Sweig. New York: Oxford University Press, 2009. xiv + 279 pp. (Paper US$ 16.95 [First paragraph] These three ostensibly very different books tell a compelling story of each author’s approach, as much as the subject matter itself. Fidel Castro: My Life: A Spoken Autobiography is based on a series of long interviews granted by the then-president of Cuba, Fidel Castro, to Spanish-Franco journalist Ignacio Ramonet. Cuba: What Everyone Needs to Know, by U.S. political analyst Julia Sweig, is one of a set country series, and, like Ramonet’s, presented in question/answer format. An Island Called Home: Returning to Jewish Cuba, with a narrative by Cuban-American anthropologist Ruth Behar and photographs by Cuban photographer Humberto Mayol, is a retrospective/introspective account of the Jewish presence in Cuba. While from Ramonet and Sweig we learn much about the revolutionary project, Behar and Mayol convey the lived experience of the small Jewish community against that backdrop.

  4. Too close to call

    DEFF Research Database (Denmark)

    Kurrild-Klitgaard, Peter

    2012-01-01

    The note briefly outlines a new model for the explanation of US presidential elections, founded on (a) recent economic growth and (b) a measure of what may be called “’the cost of ruling”. The former is based in changes in real disposable income for the period following a mid-term election, while...... the latter combines factors of incumbency and terms-in-office. The model is applied to data from the US presidential elections 1932-2008 and has considerable explanatory power for the variation in the incumbent party’s candidate’s share of the two-party vote (R2=0.74). The model is controlled against...... a number of other frequent explanations and is found to be quite robust. When augmented with approval ratings for incumbent presidents, the explanatory power increases to 83 pct. and only incorrectly calls one of the last 15 US presidential elections. Applied to the 2012 election as a forecasting model...

  5. MEDICAL SERVICE - URGENT CALLS

    CERN Multimedia

    Service Médical

    2000-01-01

    IN URGENT NEED OF A DOCTOR GENEVA: EMERGENCY SERVICES GENEVA AND VAUD 144 FIRE BRIGADE 118 POLICE 117 CERN FIREMEN 767-44-44 ANTI-POISONS CENTRE Open 24h/24h 01-251-51-51 Patient not fit to be moved, call family doctor, or: GP AT HOME: Open 24h/24h 748-49-50 AMG- Association Of Geneva Doctors: Emergency Doctors at home 07h-23h 322 20 20 Patient fit to be moved: HOPITAL CANTONAL CENTRAL 24 Micheli-du-Crest 372-33-11 ou 382-33-11 EMERGENCIES 382-33-11 ou 372-33-11 CHILDREN'S HOSPITAL 6 rue Willy-Donzé 372-33-11 MATERNITY 32 bvd.de la Cluse 382-68-16 ou 382-33-11 OPHTHALMOLOGY 22 Alcide Jentzer 382-33-11 ou 372-33-11 MEDICAL CENTRE CORNAVIN 1-3 rue du Jura 345 45 50 HOPITAL DE LA TOUR Meyrin 719-61-11 EMERGENCIES 719-61-11 CHILDREN'S EMERGENCIES 719-61-00 LA TOUR MEDICAL CENTRE 719-74-00 European Emergency Call 112   FRANCE: EMERGENCY SERVICES 15 FIRE BRIGADE 18 POLICE 17 CERN FIREMEN AT HOME 00-41-22-767-44-44 ...

  6. Call for volunteers

    CERN Multimedia

    2008-01-01

    CERN is calling for volunteers from all members of the Laboratory for organizing the two exceptional Open days.CERN is calling for volunteers from all members of the Laboratory’s personnel to help with the organisation of these two exceptional Open Days, for the visits of CERN personnel and their families on the Saturday and above all for the major public Open Day on the Sunday. As for the 50th anniversary in 2004, the success of the Open Days will depend on a large number of volunteers. All those working for CERN as well as retired members of the personnel can contribute to making this event a success. Many guides will be needed at the LHC points, for the activities at the surface and to man the reception and information points. The aim of these major Open Days is to give the local populations the opportunity to discover the fruits of almost 20 years of work carried out at CERN. We are hoping for some 2000 volunteers for the two Open Days, on the Saturday from 9 a.m. to ...

  7. Hello, England Calling

    NARCIS (Netherlands)

    A Goddard; M. van der Laaken; R. Mesker

    2008-01-01

    This paper focuses on issues of language and culture as mediated by digital video technology. The research arises from a collaborative, internationally taught module where undergraduates from 4 different countries - the UK, the USA, Sweden and the Netherlands - use discussion forums within a VLE to

  8. Call...For Help!

    Science.gov (United States)

    Gardiner, Graham

    1998-01-01

    Discusses computer-assisted language learning for foreign-language teachers, examining the history of educational technology and highlighting CD-ROM for foreign language learning. Looks at various frustrations foreign-language teachers may experience when working with new hardware and software, discusses various types of hardware and software, and…

  9. Radio frequency detection assembly and method for detecting radio frequencies

    Science.gov (United States)

    Cown, Steven H.; Derr, Kurt Warren

    2010-03-16

    A radio frequency detection assembly is described and which includes a radio frequency detector which detects a radio frequency emission produced by a radio frequency emitter from a given location which is remote relative to the radio frequency detector; a location assembly electrically coupled with the radio frequency detector and which is operable to estimate the location of the radio frequency emitter from the radio frequency emission which has been received; and a radio frequency transmitter electrically coupled with the radio frequency detector and the location assembly, and which transmits a radio frequency signal which reports the presence of the radio frequency emitter.

  10. Wireless communication technologies in distribution automation

    Energy Technology Data Exchange (ETDEWEB)

    Takala, J. [VTT Energy, Espoo (Finland)

    1996-12-31

    The project examines four different wireless communication technologies: GSM short message service, NMT data calls, packet radio network, Autonet (Actionet) status message service. The targets for communication include: energy measurement, especially in the de-regulated electricity market, secondary sub-station control, fault indicators. The research concentrates on the usability of different communication technologies for different purposes. Data about response times, error rates, retry times, communication delays, costs etc. will be collected for each communication technology and comparative results will be obtained. Some field experiments and demonstrations will be made in energy measurement and distribution network remote control. The project is divided in four tasks. Each task is described briefly

  11. Neural self-adapting architecture for video-on-radio devices

    Science.gov (United States)

    Basti, Gianfranco; Perrone, Antonio L.

    2002-03-01

    In this paper we have sketched some technical details of an FM sub-carrier technology called Multi Purpose Radio Communication Channel (MPRC). This technology delivers actually data at maximum data rate of around 40 kbs using a proprietary codec algorithm: Subsidiary Communication Channel (SCC). A core device of this codec algorithm is a DWT compressor with a proprietary pre-processing, constituted by a neural self-adapting filter, the Dynamic Perceptron Algorithm (DPA), able to detect edges and to extract objects from the moving images flow, so to optimize the overall compression rate and the image quality. As a result it is possible to obtain video transmission in QCIF format at roughly 8/12 fps using 35 kHz of the 100 kHz available for a commercial FM radio station in Europe. This allows transmitting video on FM radio together with the usual radio broadcasting. On the contrary, if we use all the available 100 kHz., we obtain, after the charge related to the error protocol, a channel for compressed video transmission of about 113 kbit, allowing high quality 640x480 (zoomed or not zoomed) video images.

  12. Application of Wireless Radio Frequency Collecting Technology in Electric Power Meter Collection%无线射频集抄技术在电力抄表中的应用

    Institute of Scientific and Technical Information of China (English)

    王春霞; 吴慧

    2012-01-01

    In this paper,based on the GPRS(General Packet Radio Service) mobile communications network,the meter data wireless collecting system is designed,the GPRS data transparent transmission module is developed and the meter data wireless transmission network is realized.With the help of the wireless IP technology and VPN(Virtual Private Network) technology,the remote wireless meter reading for industrial and civilian users is carried out efficiently and at low cost.%文中基于GPRS(General Packet Radio Service,通用无线分组业务)移动通信网络,设计了电表数据的无线集抄系统,开发了GPRS数据透明传输模块,实现了电表数据的无线传输网络。它借助于无线IP技术、虚拟数据专用网VPN(Virtual Private Network)技术,能高效、低成本进行工业或民用电表数据的远程无线集抄。

  13. An Opportunistic Routing Protocol for Mobile Cognitive Radio Ad hoc networks

    Directory of Open Access Journals (Sweden)

    S. Selvakanmani

    2014-05-01

    Full Text Available Cognitive radio, an upcoming technology gives the solution for the scarcity of spectrum where the transmitter acts as a sensible device which behaves as per the surrounding environment. A group of devices, which follows this technology, forms a temporary network called mobile cognitive radio ad hoc networks. The widely known ad hoc networks are always in moving fashion and there is no need for central abstraction in collecting the data. In such networks, formation of route(s to the destination becomes a leading problem. In Cognitive Radio ad hoc Networks (CRAHNs a challenging problem is to design the routing metric and also to reduce the packet drop. This problem arrives due to the usage of traditional routing in CRAHNs. Opportunistic routing - a new routing paradigm has been used as an alternate for maximizing the packet delivery ratio. The paper discusses about the routing protocol called CRCN CORMEN discusses about packet delivery ratio, reduces delay in a cooperative way among the nodes, when compared to the traditional Cooperative communications. The proposed protocol is evaluated and compared through NS2 simulation. The result indicates a high performance due to opportunistic routing and the evaluation is shown through by using xgraph.

  14. Adaptive control of call acceptance in WCDMA network

    Directory of Open Access Journals (Sweden)

    Milan Manojle Šunjevarić

    2013-10-01

    Full Text Available In this paper, an overview of the algorithms for access control in mobile wireless networks is presented. A review of adaptive control methods of accepting a call in WCDMA networks is discussed, based on the overview of the algorithms used for this purpose, and their comparison. Appropriate comments and conculsions in comparison with the basic characteristics of these algorithms are given. The OVSF codes are explained as well as how the allocation method influences the capacity and probability of blocking.. Introduction We are witnessing a steady increase in the number of demands placed upon modern wireless networks. New applications and an increasing number of users as well as user activities growth in recent years reinforce the need for an efficient use of the spectrum and its proper distribution among different applications and classes of services. Besides humans, the last few years saw different computers, machines, applications, and, in the future, many other devices, RFID applications, and finally networked objects, as a new kind of wireless networks "users". Because of the exceptional rise in the number of users, the demands placed upon modern wireless networks are becoming larger, and spectrum management plays an important role. For these reasons, choosing an appropriate call admission control algorithm is of great importance. Multiple access and resource management in wireless networks Radio resource management of mobile networks is a set of algorithms to manage the use of radio resources with the aim is to maximize the total capacity of wireless systems with equal distribution of resources to users. Management of radio resources in cellular networks is usually located in the base station controller, the base station and the mobile terminal, and is based on decisions made on appropriate measurement and feedback. It is often defined as the maximum volume of traffic load that the system can provide for some of the requirements for the

  15. Too close to call

    DEFF Research Database (Denmark)

    Kurrild-Klitgaard, Peter

    2012-01-01

    The note briefly outlines a new model for the explanation of US presidential elections, founded on (a) recent economic growth and (b) a measure of what may be called “’the cost of ruling”. The former is based in changes in real disposable income for the period following a mid-term election, while...... the latter combines factors of incumbency and terms-in-office. The model is applied to data from the US presidential elections 1932-2008 and has considerable explanatory power for the variation in the incumbent party’s candidate’s share of the two-party vote (R2=0.74). The model is controlled against...

  16. The crisis of the radio producing

    Directory of Open Access Journals (Sweden)

    Dr. Raúl Garcés

    2007-09-01

    Full Text Available In a media world highly influenced by new technologies revolution and the increasing impact of television, speeches on radio are frequently polarized: in one side, some scholars argue radio belongs to the past and it is no longer able of attracting younger audiences. In the other, lay those who predict long life to radio as a source of alternative and communitarian communication experiences. The author reviews the arguments that sustain both perspectives and emphasizes the need of renovating radio producing with audacious and creative formulas. At the same time, he discusses some of the challenges Cuban radio has ahead to attract new audiences, when television and printed press are recovering from the economic crack the Island suffered after Eastern European socialism disappeared.

  17. Cognitive Radio Design on an MPSoC Reconfigurable Platform

    NARCIS (Netherlands)

    Zhang, Q.; Kokkeler, Andre B.J.; Smit, Gerardus Johannes Maria

    2008-01-01

    Cognitive Radio has been proposed as a promising technology for solving today’s spectrum scarcity problem by means of dynamic spectrum access. The multiprocessor system-on-chip (MPSoC) reconfigurable platform is proposed as an enabling technology for cognitive radio. In this paper, we propose a

  18. Cognitive Radio Design on an MPSoC Reconfigurable Platform

    NARCIS (Netherlands)

    Zhang, Q.; Kokkeler, Andre B.J.; Smit, Gerardus Johannes Maria

    2007-01-01

    Cognitive Radio has been proposed as a promising technology to solve today’s spectrum scarcity problem by dynamic spectrum access. The MPSoC reconfigurable platform is proposed as an enabling technology for Cognitive Radio. In this paper, we propose a design methodology based on task transaction

  19. Cognitive Radio Design on an MPSoC Reconfigurable Platform

    NARCIS (Netherlands)

    Zhang, Q.; Kokkeler, Andre B.J.; Smit, Gerardus Johannes Maria

    2008-01-01

    Cognitive Radio has been proposed as a promising technology for solving today’s spectrum scarcity problem by means of dynamic spectrum access. The multiprocessor system-on-chip (MPSoC) reconfigurable platform is proposed as an enabling technology for cognitive radio. In this paper, we propose a desi

  20. Cognitive Radio Design on an MPSoC Reconfigurable Platform

    NARCIS (Netherlands)

    Zhang, Q.; Kokkeler, Andre B.J.; Smit, Gerardus Johannes Maria

    2007-01-01

    Cognitive Radio has been proposed as a promising technology to solve today’s spectrum scarcity problem by dynamic spectrum access. The MPSoC reconfigurable platform is proposed as an enabling technology for Cognitive Radio. In this paper, we propose a design methodology based on task transaction lev

  1. Cognitive Radio Design on an MPSoC Reconfigurable Platform

    NARCIS (Netherlands)

    Zhang, Qiwei; Kokkeler, A.B.J.; Smit, G.J.M.

    2008-01-01

    Cognitive Radio has been proposed as a promising technology for solving today’s spectrum scarcity problem by means of dynamic spectrum access. The multiprocessor system-on-chip (MPSoC) reconfigurable platform is proposed as an enabling technology for cognitive radio. In this paper, we propose a desi

  2. Radio Telescopes "Save the Day," Produce Data on Titan's Winds

    Science.gov (United States)

    2005-02-01

    In what some scientists termed "a surprising, almost miraculous turnabout," radio telescopes, including major facilities of the National Science Foundation's National Radio Astronomy Observatory (NRAO), have provided data needed to measure the winds encountered by the Huygens spacecraft as it descended through the atmosphere of Saturn's moon Titan last month -- measurements feared lost because of a communication error between Huygens and its "mother ship" Cassini. The Green Bank Telescope The Robert C. Byrd Green Bank Telescope CREDIT: NRAO/AUI/NSF (Click on image for GBT gallery) A global network of radio telescopes, including the NRAO's Robert C. Byrd Green Bank Telescope (GBT) in West Virginia and eight of the ten antennas of the Very Long Baseline Array (VLBA), recorded the radio signal from Huygens during its descent on January 14. Measurements of the frequency shift caused by the craft's motion, called Doppler shift, are giving planetary scientists their first direct information about Titan's winds. "When we began working with our international partners on this project, we thought our telescopes would be adding to the wind data produced by the two spacecraft themselves. Now, with the ground-based telescopes providing the only information about Titan's winds, we are extremely proud that our facilities are making such a key contribution to our understanding of this fascinating planetary body," said Dr. Fred K.Y. Lo, Director of the National Radio Astronomy Observatory (NRAO). Early analysis of the radio-telescope data shows that Titan's wind flows from west to east, in the direction of the moon's rotation, at all altitudes. The highest wind speed, nearly 270 mph, was measured at an altitude of about 75 miles. Winds are weak near Titan's surface and increase in speed slowly up to an altitude of about 37 miles, where the spacecraft encountered highly-variable winds that scientists think indicate a region of vertical wind shear. The ground-based Doppler

  3. Observations of Radio Giant Pulses with GAVRT

    CERN Document Server

    Jones, Glenn

    2015-01-01

    Radio giant pulses provide a unique opportunity to study the pulsar radio emission mechanism in exquisite detail. Previous studies have revealed a wide range of properties and phenomena, including extraordinarily high brightness temperatures, sub-nanosecond emission features, and banded dynamic spectra. New measurements of giant pulse characteristics can help guide and test theoretical emission models. To this end, an extensive observation campaign has begun which will provide more than 500 hours on the Crab with a 34-meter antenna located in California, USA. The observations are being done as part of an educational outreach program called the Goldstone-Apple Valley Radio Telescope (GAVRT). This antenna has a novel wide bandwidth receiver which provides up to 8 GHz of instantaneous bandwidth in the range of 2.5 to 14 GHz. These observations will provide detailed information about the variability, amplitude distribution, and detailed frequency structure of radio giant pulses. In addition, a database of pulses ...

  4. USING RF TECHNOLOGY FOR PROTECTED ASSET TRACKING

    Energy Technology Data Exchange (ETDEWEB)

    Younkin, James R [ORNL; Pickett, Chris A [ORNL; Richardson, Dave [ORNL; Stinson, Brad J [ORNL

    2008-01-01

    The Oak Ridge National Laboratory (ORNL) is working on systems that use a new radio frequency (RF) technology called Rubee to manage and inventory many types of protected assets, including weapons housed in Department of Energy (DOE) armories, tooling, and nuclear material containers. Rubee is being considered for an IEEE Standard, and is used on several projects at ORNL because of its high performance when used in, on, and around metal-an environment that is typical of that found in an armory vault and that of many other protected assets locations within nuclear facilities. The primary objective using Rubee is to supply sustainable technology that provides timely information on the status and location of protected assets. This paper focuses on the results from a deployment of this technology at a DOE armory and discusses the applicability of Rubee for use with other protected assets within nuclear facilities. Key Words: Rubee , low radio frequency, protected assets

  5. Impact of cognitive radio on radio astronomy

    NARCIS (Netherlands)

    Bentum, M.J.; Boonstra, A.J.; Baan, W.A.

    2010-01-01

    The introduction of new communication techniques requires an increase in the efficiency of spectrum usage. Cognitive radio is one of the new techniques that fosters spectrum efficiency by using unoccupied frequency spectrum for communications. However, cognitive radio will increase the transmission

  6. Indoor Positioning with Radio Location Fingerprinting

    DEFF Research Database (Denmark)

    Kjærgaard, Mikkel Baun

    are heterogeneous even when only considering clients for the same technology. The heterogeneity is due to dierent radios, antennas, and rmwares causing measurements for location ngerprinting not to be directly comparable among clients. Heterogeneity is a challenge for location ngerprinting because it severely......An increasingly important requirement for many novel applications is sensing the positions of people, equipment, animals, etc. GPS technology has proven itself as a successfull technology for positioning in outdoor environments but indoor no technology has yet gained a similar wide-scale adoption....... A promising indoor positioning technique is radio-based location ngerprinting, having the major advantage of exploiting already existing radio infrastructures, like IEEE 802.11 or GSM, which avoids extra deployment costs and eort. The research goal of this thesis is to address the limitations of current...

  7. DARPA NetCentric radio demonstration

    Science.gov (United States)

    Stotts, Larry B.; Seidel, Scott; Krout, Tim; Kolodzy, Paul

    2007-04-01

    The objective of the DARPA Network Centric Radio System1 (NCRS) Program was to design, develop, integrate, and demonstrate the enabling communication technologies and system capabilities required to enable network centric warfare. NCRS is a First Generation Mobile, Ad Hoc Network (MANET) designed to enable ground and airborne vehicle based on-the-move and on-the-halt network centric connectivity. It demonstrated a gateway architecture that offers interoperability among various current, future, coalition and first responder communications radios, via the network, not the radio. This capability illustrated a new dimension for military communications interoperability.

  8. Educational Radio in India

    OpenAIRE

    VYAS, R. V.; R. C. Sharma; Kumar, Ashwini

    2002-01-01

    There are a good number of research studies, which indicate that radio has been a good medium of education delivery. Many experiments have been conducted in different countries on the use of radio in education. Radio has been used in conventional education, non-formal education, for agricultural education, for community development, in distance education, so on and so forth. This paper explains various educational radio projects undertaken in India

  9. Dusty but Mighty: Using Radio in the Critical Media Literacy Classroom

    Science.gov (United States)

    Todorova, Miglena S.

    2015-01-01

    In a culture dominated by images, what is the capacity of radio-making to enact the ideals and meet the objectives of critical medial literacy education that empowers learners and expands democracy? This article conceptualizes a radio-based critical media literacy approach drawing upon a course project called "Borderless Radio," where…

  10. "At 75 You Don't Expect to Become a Radio Star"

    Science.gov (United States)

    Stanistreet, Paul

    2011-01-01

    When 75-year-old Margaret Corston saw a poster in her local library advertising a course in basic radio broadcasting skills, she little thought that some 18 months later she would be hosting her own weekly show, with thousands of listeners, on community radio. From small beginnings--her first course was called "First Steps in Radio"--she began to…

  11. Commercial Radio as Communication.

    Science.gov (United States)

    Rothenbuhler, Eric W.

    1996-01-01

    Compares the day-to-day work routines of commercial radio with the principles of a theoretical communication model. Illuminates peculiarities of the conduct of communication by commercial radio. Discusses the application of theoretical models to the evaluation of practicing institutions. Offers assessments of commercial radio deriving from…

  12. Linguistics, Procedure and Technique in CALL Teacher Education

    Science.gov (United States)

    Torsani, Simone

    2015-01-01

    Research in CALL education has identified a series of goals and constraints for technology in language education that need to be taken into account when designing a CALL syllabus. This article presents a theoretical framework for syllabus design based on the identification of three areas of expertise within CALL: linguistic knowledge, procedural…

  13. Introduce the Development of the Technology of the FM Radio Transmitter%调频广播发射机技术的发展趋向

    Institute of Scientific and Technical Information of China (English)

    武海波; 王毅; 吴先华

    2014-01-01

    通过对美国哈里斯公司近年先后推出的Z10CD和Flexiva FAX 10K两型大功率调频广播发射机进行比较、分析,对未来调频广播发射机特别是大功率发射机的发展趋势进行思考,提出了调频大功率广播发射机向高可靠性、高效率、高质量、高集成、高智能等方向发展的观点。%By comparing and analyzing Z10CD FM broadcast transmitter to FAX 10k FM broadcast transmitter which has been introduced by Harris in recent years,and thinking about the future trends of FM radio transmit-ter,especially for high-power transmitter,that the development of the FM radio transmitter is high reliability, high efficiency,high quality,high integration and intelligence.

  14. Development of a project on North Unit Irrigation District’s Main Canal at the Monroe Drop, using a novel low-head hydropower technology called the SLH100

    Energy Technology Data Exchange (ETDEWEB)

    Schneider, Abraham [Natel Energy, Inc., Alameda, CA (United States); Schneider, Gia [Natel Energy, Inc., Alameda, CA (United States); McKinstry, Katherine [Natel Energy, Inc., Alameda, CA (United States); Harwood, Meghan [Natel Energy, Inc., Alameda, CA (United States)

    2017-03-14

    Natel Energy is a low­-head, distributed hydropower company based out of Alameda, CA. Natel manufactures and sells proprietary hydroelectric turbines called hydroEngines® that are suitable for low-­head, high-­flow settings, and range from 30kW to 1 MW of capacity per unit. Natel’s hydroEngine is a state­-of­the-­art two stage impulse turbine, using blades mounted symmetrically on two belts perpendicular to the axis of travel, and using linearly­-moving foils, rather than a rotor, to enable efficient conversion of kinetic energy of large volumes of water at low head with no risk of cavitation. In addition, the hydroEngine can be installed at or above tailwater level, reducing the excavation necessary to build the powerhouse and thus reducing total installed cost and project footprint. Thus, the hydroEngine technology enables a new generation of small hydro installations with low cost of project development, fish-­friendly operations, and small project footprint. In September of 2015, Natel Energy formally commissioned its first project installation in Madras, Oregon, installing 1 SLH100 turbine at an existing drop structure on the North Unit Irrigation District (NUID) Main Canal. The water falls between 13.5 feet to 16.5 feet at this structure, depending on flow. The plant has an installed capacity of 250 kW and an expected annual generation of approximately 873 MWh. The plant operates at an annual capacity factor of 40%, and a capacity factor over the irrigation season, or period of available flow, of 80%. Annual capacity factor is calculated as a percentage of plant operating hours relative to a total of 8,760 hours in a year; because the irrigation canal in which the Project is located only runs water from April to October, the available flow capacity factor is higher. Net greenhouse gas reductions from the Monroe Project are estimated to be 602 tCO2/year. The purpose of this report is to provide an overview of the specifications for Natel’s first

  15. Management of Distributed and Extendible Heterogeneous Radio Architectures

    DEFF Research Database (Denmark)

    Ramkumar, Venkata; Mihovska, Albena D.; Prasad, Neeli R.

    2009-01-01

    Wireless communication systems are dynamic by nature, which comes from several factors, namely: radio propagation impairments, traffic changes, interference conditions, user mobility, etc. In a heterogeneous environment, , the dynamic network behavior calls for a dynamic management of the radio...... access units (RAUs). In order to increase the radio coverage and capacity, this paper proposes a radio resource management (RRM) framework that takes advantage of an RoF centralized topology and can serve a large number of heterogeneous RAUs. The proposed framework is described in terms of physical...

  16. 一种采用DAB技术的分区广播接收终端设计%A Design of DAB Technology-based Regional Radio Receiving Terminal

    Institute of Scientific and Technical Information of China (English)

    王国裕; 陈永飞; 张红升

    2013-01-01

    According to the digital audio broadcasting(DAB(technology,this paper designed a new wireless regional radio receiver terminal.Such novel partition broadcast receiving terminal,using a proactive identification mechanism,not only can filter and shield the specified broadcast information,but also can accurately judge the legitimacy of the transmission source of the broadcast information.Test results showed that the partition radio receiving terminal can correct completion of the partition broadcast each function,reaction time below 10s,signal sensitivity to-99dBm.%  本文采用数字音频广播(DAB)技术,设计了一种新的无线分区广播接收终端,制定了一套主动身份识别机制,不但能筛选和屏蔽指定的广播信息,还能进行判断广播信息发射源的合法性.经测试,这种分区广播接收终端能够正确的完成分区广播的各项功能,反应时间在3s以内,信号灵敏度达到-99dBm.

  17. 数字鉴频技术在电台检测设备中的应用%Application of Digital Frequency-Detecting Technology in the Radio Tester

    Institute of Scientific and Technical Information of China (English)

    夏明飞; 夏明旗

    2011-01-01

    针对电台检测的测试需求,简述了传统的模拟鉴频技术,重点分析脉冲滤波法和微分鉴频法的数字鉴频技术,并对2种方法进行仿真运算和算法性能比较,给出了适合于手持式低功耗的电台检测设备的数字鉴频方法.仿真结果表明,该设计不仅能避免模拟电路的一致性和稳定性,而且可利用统一的音频信号处理硬件平台,提高系统设计集成度.%In order to meet the measurement demand of the radio, this paper briefly describes the traditional analog frequency-detecting technology, and analyzes the pulse filter method and differential frequency-detecting method in detail.Both of the methods were simulated and compared. Finally the method was given to suit for the portable and low power radio tester. The simulation result proved that this design can avoid the analog circuit's stability and consistence. When we make use of audio signal processing hardware platform, this design can improve the integration of the system design also.

  18. Technological change and job redesign: implications for the quality of working life : a qualitative case study into employee experiences during the digitalization of radio and television program production

    OpenAIRE

    Rintala, Niina

    2005-01-01

    Technological advances have brought about extensive changes in work over the last few decades. In many industries, work has changed from specialized, often monotonous, manufacturing work to non-routine, complex and autonomous knowledge work that produces outputs characterized by information content. Simultaneously, job descriptions have increased in scope and autonomy. Technological development and job redesign continue to change work in many industries. Both the use of new technology at the ...

  19. Ham radio for dummies

    CERN Document Server

    Silver, H Ward

    2013-01-01

    An ideal first step for learning about ham radio Beyond operating wirelessly, today's ham radio operators can transmit data and pictures; use the Internet, laser, and microwave transmitters; and travel to places high and low to make contact. This hands-on beginner guide reflects the operational and technical changes to amateur radio over the past decade and provides you with updated licensing requirements and information, changes in digital communication (such as the Internet, social media, and GPS), and how to use e-mail via radio. Addresses the critical use of ham radio for replacing downe

  20. Radio Refractivity Study in Akure-Owo Digital Microwave Link in ...

    African Journals Online (AJOL)

    Radio Refractivity Study in Akure-Owo Digital Microwave Link in South Western Nigeria. ... Nigerian Journal of Technology ... Sub refraction is a situation in which the radio signal beam is refracted upwards in the link thereby resulting in ...

  1. Dynamic routing based on call quality

    CERN Document Server

    Hammami, Oussama; Gabrielyan, Emin

    2009-01-01

    The telephony over IP (ToIP) is becoming a new trend in technology widely used nowadays in almost all business sectors. Its concepts rely on transiting the telephone communications through the IP network. Today, this technology is deployed increasingly what the cause of emergence of companies is offering this service as Switzernet. For several highly demanded destinations, recently fake vendors appeared in the market offering voice termination but providing only false answer supervision. The answered signal is returned immediately and calls are being charged without being connected. Different techniques are used to keep the calling party on the line. One of these techniques is to play a record of a ring back tone (while the call is already being charged). Another, more sophisticated technique is to play a human voice randomly picked up from a set of records containing contents similar to: hello, hello, I cannot hear you Apart the fact that the fallaciously established calls are charged at rates of real calls,...

  2. Nanometer CMOS Sigma-Delta Modulators for Software Defined Radio

    CERN Document Server

    Morgado, Alonso; Rosa, José M

    2012-01-01

    This book presents innovative solutions for the implementation of Sigma-Delta Modulation (SDM) based Analog-to-Digital Conversion (ADC), required for the next generation of wireless hand-held terminals. These devices will be based on the so-called multistandard transceiver chipsets, integrated in nanometer CMOS technologies. One of the most challenging and critical parts in such transceivers is the analog-digital interface, because of the assorted signal bandwidths and dynamic ranges that can be required to handle the A/D conversion for several operation modes.   This book describes new adaptive and reconfigurable SDM ADC topologies, circuit strategies and synthesis methods, specially suited for multi-standard wireless telecom systems and future Software-defined-radios (SDRs) integrated in nanoscale CMOS. It is a practical book, going from basic concepts to the frontiers of SDM architectures and circuit implementations, which are explained in a didactical and systematic way. It gives a comprehensive overview...

  3. How unusual is the cool-core radio halo cluster CL1821+643 ?

    CERN Document Server

    Kale, Ruta

    2016-01-01

    Massive galaxy clusters with cool-cores typically host diffuse radio sources called mini-haloes, whereas, those with non-cool-cores host radio haloes. We attempt to understand the unusual nature of the cool-core galaxy cluster CL1821+643 that hosts a Mpc-scale radio halo using new radio observations and morphological analysis of its intra-cluster medium. We present the Giant Metrewave Radio Telescope (GMRT) 610 MHz image of the radio halo. The spectral index, $\\alpha$ defined as $S\\propto \

  4. Analisis Kendala Perizinan Spektrum Frekuensi Radio untuk Radio Komunitas

    OpenAIRE

    Sri Wahyuningsih

    2014-01-01

    Izin penggunaan spektrum frekuensi radio diatur dalam Undang-undang No.36 tahun 1999 tentang Telekomunikasi. Saat ini masih ditemukan Radio Komunitas yang belum memiliki Izin Stasiun Radio (ISR). Penelitian ini bertujuan untuk menemu kenali kendala-kendala yang dihadapi Radio Komunitas pada proses pengajuan Izin Stasiun Radio (ISR). Teknik pengumpulan data melalui wawancara dengan penanggungjawab Radio Komunitas dan pejabat di lingkungan Balai Monitor Frekuensi Radio (Balmon) di Jakarta, Sema...

  5. Analisis Kendala Perizinan Spektrum Frekuensi Radio untuk Radio Komunitas

    OpenAIRE

    2014-01-01

    Izin penggunaan spektrum frekuensi radio diatur dalam Undang-undang No.36 tahun 1999 tentang Telekomunikasi. Saat ini masih ditemukan Radio Komunitas yang belum memiliki Izin Stasiun Radio (ISR). Penelitian ini bertujuan untuk menemu kenali kendala-kendala yang dihadapi Radio Komunitas pada proses pengajuan Izin Stasiun Radio (ISR). Teknik pengumpulan data melalui wawancara dengan penanggungjawab Radio Komunitas dan pejabat di lingkungan Balai Monitor Frekuensi Radio (Balmon) di Jakarta, Sema...

  6. Technology-based programs to support forms of leisure engagement and communication for persons with multiple disabilities: two single-case studies.

    Science.gov (United States)

    Lancioni, Giulio E; Singh, Nirbhay N; O'Reilly, Mark F; Green, Vanessa; Oliva, Doretta; Buonocunto, Francesca; Sacco, Valentina; Biancardi, Emma M; Di Nuovo, Santo

    2012-01-01

    To extend the assessment of technology-based programs for promoting stimulus choice and staff/caregiver calls or radio operation and text messaging. In Study I, the program involved a portable computer, commercial software, and a microswitch to allow a man with motor impairment and moderate intellectual disability to choose among preferred stimuli (e.g., songs and film clips) and persons to call. In Study II, the programs involved (a) a radio device and an electronic control unit or (b) a net-book computer and a global system for mobile communication. A woman with blindness and moderate intellectual disability used a microswitch to operate the radio or send and listen to text messages. The participants succeeded in using the technology-aided programs through simple microswitch activations involving partial hand closure (Study I) or hand pressure (Study II). Technology-based programs can provide persons with multiple disabilities relevant leisure and communication opportunities.

  7. Listen and talk full-duplex cognitive radio networks

    CERN Document Server

    Liao, Yun; Han, Zhu

    2016-01-01

    This brief focuses on the use of full-duplex radio in cognitive radio networks, presenting a novel spectrum sharing protocol that allows the secondary users to simultaneously sense and access the vacant spectrum. This protocol, called “Listen-and-talk” (LAT), is evaluated by both mathematical analysis and computer simulations in comparison with other existing protocols, including the listen-before-talk protocol. In addition to LAT-based signal processing and resource allocation, the brief discusses techniques such as spectrum sensing and dynamic spectrum access. The brief proposes LAT as a suitable access scheme for cognitive radio networks, which can support the quality-of-service requirements of these high priority applications. Fundamental theories and key techniques of cognitive radio networks are also covered. Listen and Talk: Full-duplex Cognitive Radio Networks is designed for researchers, developers, and professionals involved in cognitive radio networks. Advanced-level students studying signal pr...

  8. BUSINESS MODELS FOR EXTENDING OF 112 EMERGENCY CALL CENTER CAPABILITIES WITH E-CALL FUNCTION INSERTION

    Directory of Open Access Journals (Sweden)

    Pop Dragos Paul

    2010-12-01

    Full Text Available The present article concerns present status of implementation in Romania and Europe of eCall service and the proposed business models regarding eCall function implementation in Romania. eCall system is used for reliable transmission in case of crush between In Vehicle System and Public Service Answering Point, via the voice channel of cellular and Public Switched Telephone Network (PSTN. eCall service could be initiated automatically or manual the driver. All data presented in this article are part of researches made by authors in the Sectorial Contract Implementation study regarding eCall system, having as partners ITS Romania and Electronic Solution, with the Romanian Ministry of Communication and Information Technology as beneficiary.

  9. New radio model in the fourth screen: radiovision, the radio that you can watch

    Directory of Open Access Journals (Sweden)

    Sandra CAVIA FRAILE

    2016-12-01

    Full Text Available The traditional radio is not strange to the social revolution that Internet and new technologies are raising. In recent years, the fourth screen has led the emergence of new models of radio, including Radiovision. The «radio that you can watch» intends to change and innovate the radio broadcasting media to offer a product that meets the multimedia requirements of users. However, currently, the Radiovisión is still at an early stage and it has many aspects that it should improve and care, as the contents and the staging. It is a big chance for the radio that poses challenges and opportunities both for journalism and journalists.

  10. RF & wireless technologies know it all

    CERN Document Server

    Fette, Bruce A; Chandra, Praphul; Dobkin, Daniel M; Bensky, Dan; Miron, Douglas B; Lide, David; Dowla, Farid; Olexa, Ron

    2007-01-01

    The Newnes Know It All Series takes the best of what our authors have written to create hard-working desk references that will be an engineer's first port of call for key information, design techniques and rules of thumb. Guaranteed not to gather dust on a shelf!RF (radio frequency) and wireless technologies drive communication today. This technology and its applications enable wireless phones, portable device roaming, and short-range industrial and commercial application communication such as the supply chain management wonder, RFID. Up-to-date information regarding software defined R

  11. Cognitive Radio — Genetic Algorithm Approach

    Science.gov (United States)

    Reddy, Y. B.

    2005-03-01

    Cognitive Radio (CR) is relatively a new technology, which intelligently detects a particular segment of the radio spectrum currently in use and selects unused spectrum quickly without interfering the transmission of authorized users. Cognitive Radios can learn about current use of spectrum in their operating area, make intelligent decisions, and react to immediate changes in the use of spectrum by other authorized users. The goal of CR technology is to relieve radio spectrum overcrowding, which actually translates to a lack of access to full radio spectrum utilization. Due to this adaptive behavior, the CR can easily avoid the interference of signals in a crowded radio frequency spectrum. In this research, we discuss the possible application of genetic algorithms (GA) to create a CR that can respond intelligently in changing and unanticipated circumstances and in the presence of hostile jammers and interferers. Genetic algorithms are problem solving techniques based on evolution and natural selection. GA models adapt Charles Darwin's evolutionary theory for analysis of data and interchanging design elements in hundreds of thousands of different combinations. Only the best-performing combinations are permitted to survive, and those combinations "reproduce" further, progressively yielding better and better results.

  12. Realistic Radio Communications in Pilot Simulator Training

    Science.gov (United States)

    Burki-Cohen, Judith; Kendra, Andrew J.; Kanki, Barbara G.; Lee, Alfred T.

    2000-01-01

    Simulators used for total training and evaluation of airline pilots must satisfy stringent criteria in order to assure their adequacy for training and checking maneuvers. Air traffic control and company radio communications simulation, however, may still be left to role-play by the already taxed instructor/evaluators in spite of their central importance in every aspect of the flight environment. The underlying premise of this research is that providing a realistic radio communications environment would increase safety by enhancing pilot training and evaluation. This report summarizes the first-year efforts of assessing the requirement and feasibility of simulating radio communications automatically. A review of the training and crew resource/task management literature showed both practical and theoretical support for the need for realistic radio communications simulation. A survey of 29 instructor/evaluators from 14 airlines revealed that radio communications are mainly role-played by the instructor/evaluators. This increases instructor/evaluators' own workload while unrealistically lowering pilot communications load compared to actual operations, with a concomitant loss in training/evaluation effectiveness. A technology review searching for an automated means of providing radio communications to and from aircraft with minimal human effort showed that while promising, the technology is still immature. Further research and the need for establishing a proof-of-concept are also discussed.

  13. A Comparison of Radio and X-Ray Morphologies of Four Clusters of Galaxies Containing Radio Halos

    CERN Document Server

    Govoni, F; Feretti, L; Giovannini, G

    2001-01-01

    Clusters of galaxies may contain cluster-wide, centrally located, diffuse radio sources, called halos. They have been found to show morphologies similar to those of the X-ray emission. To quantify this qualitative statement we performed a point-to-point comparison of the radio and the X-ray emission for four clusters of galaxies containing radio halos: Coma, Abell 2255, Abell 2319, Abell 2744. Our study leads to a linear relation between the radio and the X-ray surface brightness in two clusters, namely Abell 2255 and Abell 2744. In Coma and A2319 the radio and the X-ray brightnesses seem to be related with a sub-linear power law. Implications of these findings within simple radio halo formation models are briefly discussed.

  14. Technical Evaluation Report #62: The Return of Educational Radio?

    Directory of Open Access Journals (Sweden)

    Sally D. Berman

    2008-06-01

    Full Text Available This paper examines one of the traditional technologies of distance education, radio, and presents examples of educational and community radio usage in Asia and Africa. Instead of merely transposing western approaches to distance education in developing countries, it is suggested that the developed world can learn from uses of radio in developing countries, and that the medium deserves greater attention as a means of giving educational opportunity to rural, isolated peoples worldwide.

  15. Radio-frequency integrated-circuit engineering

    CERN Document Server

    Nguyen, Cam

    2015-01-01

    Radio-Frequency Integrated-Circuit Engineering addresses the theory, analysis and design of passive and active RFIC's using Si-based CMOS and Bi-CMOS technologies, and other non-silicon based technologies. The materials covered are self-contained and presented in such detail that allows readers with only undergraduate electrical engineering knowledge in EM, RF, and circuits to understand and design RFICs. Organized into sixteen chapters, blending analog and microwave engineering, Radio-Frequency Integrated-Circuit Engineering emphasizes the microwave engineering approach for RFICs. Provide

  16. The new class of FR0 radio galaxies

    Science.gov (United States)

    Baldi, Ranieri D.

    2016-08-01

    I present my recent project aimed at studying the bulk of the radio-emitting AGN population. In previous works (Baldi & Capetti 2009, 2010) we provide evidences of an emerging population of compact radio galaxies which lack of extended radio emission. In a pilot JVLA project, we observe a small but representative sub-sample of this population. The radio maps reveal compact unresolved or slightly resolved radio structures on a scale of 1-3 kpc. We find that these radio-loud AGN live in red massive early-type galaxies, with large black hole masses ( 10^{8} solar mass), and spectroscopically classified as Low Excitation Galaxies, all characteristics typical of FRI radio galaxies which they also share the same nuclear luminosity with. However, they are more core dominated (by a factor of 30) than FRIs and show a clear deficit of extended radio emission. We call these sources 'FR0' to emphasize their lack of prominent extended radio emission (Baldi et al 2015). The emerging FR0 population appears to be the dominant radio class of the local Universe. Considering their properties I peculate their possible origins and the possible cosmological scenarios they imply.

  17. The new class of FR0 radio galaxies

    CERN Document Server

    Baldi, Ranieri D; Giovannini, Gabriele

    2015-01-01

    Are the FRI and FRII radio galaxies representative of the radio-loud (RL) AGN population in the local Universe? Recent studies on the local low-luminosity radio sources cast lights on an emerging population of compact radio galaxies which lack extended radio emission. In a pilot JVLA project, we study the high-resolution images of a small but representative sample of this population. The radio maps reveal compact unresolved or slightly resolved radio structures on a scale of 1-3 kpc. We find that these RL AGN live in red massive early-type galaxies, with large black hole masses ($\\gtrsim$10$^{8}$ M$_{\\odot}$), and spectroscopically classified as Low Excitation Galaxies, all characteristics typical of FRI radio galaxies which they also share the same nuclear luminosity with. However, they are more core dominated (by a factor of $\\sim$30) than FRIs and show a clear deficit of extended radio emission. We call these sources 'FR0' to emphasize their lack of prominent extended radio emission. A posteriori, other co...

  18. Senior radio listeners

    DEFF Research Database (Denmark)

    Blaakilde, Anne Leonora

    Radiobroadcasting and the hardware materialization of radio have during the 20th century changed significantly, which means that senior radio listeners have travelled along with this evolution from large, impressive radio furnitures to DAB and small, wireless, mobile devices, and from grave...... and solemn radio voices to lightharted, laughing and chatting speakers. Senior radio listerners have experienced the development and refinements of technique, content and genres. It is now expected of all media users that they are capable of crossing media, combining, juggling and jumping between various...... media platforms, not the least when listening to radio. The elder generation is no exception from this. Recently, for instance, the Danish public broadcast DR has carried out an exodus of programmes targeted for the senior segment. These programmes are removed from regular FM and sent to DAB receivers...

  19. 47 CFR 97.19 - Application for a vanity call sign.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 5 2010-10-01 2010-10-01 false Application for a vanity call sign. 97.19... SERVICES AMATEUR RADIO SERVICE General Provisions § 97.19 Application for a vanity call sign. (a) The... to make application for modification of the license grant, or the renewal thereof, to show a...

  20. Fast Radio Bursts

    Indian Academy of Sciences (India)

    Akshaya Rane; Duncan Lorimer

    2017-09-01

    We summarize our current state of knowledge of fast radio bursts (FRBs) which were first discovered a decade ago. Following an introduction to radio transients in general, including pulsars and rotating radio transients, we discuss the discovery of FRBs. We then discuss FRB follow-up observations in the context of repeat bursts before moving on to review propagation effects on FRB signals, FRB progenitor models and an outlook on FRBs as potential cosmological tools.

  1. High Efficiency Traveling-Wave Tube Power Amplifier for Ka-Band Software Defined Radio on International Space Station-A Platform for Communications Technology Development

    Science.gov (United States)

    Simons, Rainee N.; Force, Dale A.; Kacpura, Thomas J.

    2013-01-01

    The design, fabrication and RF performance of the output traveling-wave tube amplifier (TWTA) for a space based Ka-band software defined radio (SDR) is presented. The TWTA, the SDR and the supporting avionics are integrated to forms a testbed, which is currently located on an exterior truss of the International Space Station (ISS). The SDR in the testbed communicates at Ka-band frequencies through a high-gain antenna directed to NASA s Tracking and Data Relay Satellite System (TDRSS), which communicates to the ground station located at White Sands Complex. The application of the testbed is for demonstrating new waveforms and software designed to enhance data delivery from scientific spacecraft and, the waveforms and software can be upgraded and reconfigured from the ground. The construction and the salient features of the Ka-band SDR are discussed. The testbed is currently undergoing on-orbit checkout and commissioning and is expected to operate for 3 to 5 years in space.

  2. A Zynq-based Cluster Cognitive Radio

    OpenAIRE

    Rooks, Kurtis M.

    2014-01-01

    Traditional hardware radios provide very rigid solutions to radio problems. Intelligent software defined radios, also known as cognitive radios, provide flexibility and agility compared to hardware radio systems. Cognitive radios are well suited for radio applications in a changing radio frequency environment, such as dynamic spectrum access. In this thesis, a cognitive radio is demonstrated where the system self reconfigures to dem...

  3. Harmonization based on regulatory science between scientific and commercial radio uses in a case of ultrawideband radio

    Science.gov (United States)

    Kohno, Ryuji; Iinatti, Jari; Sameshima, Keiko

    2016-12-01

    Harmonization for scientific and commercial radio uses is one of the unsolved problems in academia, industry, and regulatory bodies. The demands for commercial radio, mobile communications, and broadcasting have significantly increased over the past few decades; therefore, interference has become a major concern. There is an increasing need to prevent such interferences, for example, between commercial radio systems and other potentially sensitive radio systems such as those used for radio astronomy or studies. When discussing the fairness in resolving such conflicts, regulatory science may be a useful multidisciplinary approach as it scientifically investigates the advantages and disadvantages of a new application or technology for conflicts between different stakeholders through a mathematical analysis of risks versus benefits of the given technology. Such an analysis enables fair rules or regulations to be made. In this study, we apply the above-mentioned concept to harmonize the scientific and commercial uses of radio. After a brief introduction to regulatory science, a case study about the coexistence between ultrawideband commercial radio systems and radio astronomy is considered. Finally, a proposal by International Union of Radio Science, Japan, to the Science Council of Japan in the Cabinet Office to establish a "Center for Coexistence and Harmonization of Scientific and Commercial Uses of Radio Waves" is explained.

  4. Transformations of Radio Aesthetics

    Directory of Open Access Journals (Sweden)

    Grażyna Stachyra

    2015-09-01

    Full Text Available The paper presents some remarks upon the nature of contemporary radio communications in the context of the terms “aesthetics” and “aesthetisation”. The latter, denoting a process of turning aesthetic phenomena into unaesthetic ones, becomes the dominant strategy of formatted radio. The “surface aesthetisation,” which provides mainly pleasure and entertainment, transcends the simple styling of objects or environment and appears to be a more significant strand of contemporary culture. The article shows several examples of “surface” modelling of radio programming and explains their purpose in radio communication.

  5. An Intelligent Call Admission Control Decision Mechanism for Wireless Networks

    CERN Document Server

    S., Ramesh Babu H; S, Satyanarayana P

    2010-01-01

    The Call admission control (CAC) is one of the Radio Resource Management (RRM) techniques plays instrumental role in ensuring the desired Quality of Service (QoS) to the users working on different applications which have diversified nature of QoS requirements. This paper proposes a fuzzy neural approach for call admission control in a multi class traffic based Next Generation Wireless Networks (NGWN). The proposed Fuzzy Neural Call Admission Control (FNCAC) scheme is an integrated CAC module that combines the linguistic control capabilities of the fuzzy logic controller and the learning capabilities of the neural networks .The model is based on Recurrent Radial Basis Function Networks (RRBFN) which have better learning and adaptability that can be used to develop the intelligent system to handle the incoming traffic in the heterogeneous network environment. The proposed FNCAC can achieve reduced call blocking probability keeping the resource utilisation at an optimal level. In the proposed algorithm we have c...

  6. 浅谈RFID技术在图书馆的应用%Talking about the Application of RFID(Radio Frequency Identification) Technology in the Library

    Institute of Scientific and Technical Information of China (English)

    关晓颖

    2015-01-01

    This paper introduces the development status of RFID technology in library world, expounds the working principles and structural components of RFID, carries out an analytic demonstration of the advantages of RFID technology in its application in the library, and analyzes some problems existing in the practice of RFID technology.%介绍了RFID技术在图书馆界的发展情况,阐述了RFID的工作原理和结构组成,分析论证了RFID技术在图书馆工作中应用的优势,并对RFID技术在实践中存在的问题进行了剖析.

  7. SPECTRUM SENSING IN COGNITIVE RADIO NETWORKS: QOS CONSIDERATIONS

    Directory of Open Access Journals (Sweden)

    Nabil Giweli

    2015-12-01

    Full Text Available The rapidly growing number of wireless communication devices has led to massive increases in radio traffic density, resulting in a noticeable shortage of available spectrum. To address this shortage, the Cognitive Radio (CR technology offers promising solutions that aim to improve the spectrum utilization. The operation of CR relies on detecting the so-called spectrum holes, the frequency bands that remain unoccupied by their licensed operators. The unlicensed users are then allowed to communicate using these spectrum holes. As such, the performance of CR is highly dependent on the employed spectrum sensing methods. Several sensing methods are already available. However, no individual method can accommodate all potential CR operation scenarios. Hence, it is fair to ascertain that the performance of a CR device can be improved if it is capable of supporting several sensing methods. It should obviously also be able to select the most suitable method. In this paper, several spectrum sensing methods are compared and analyzed, aiming to identify their advantages and shortcomings in different CR operating conditions. Furthermore, it identifies the features that need to be considered while selecting a suitable sensing method from the catalog of available methods.

  8. The host galaxy of a fast radio burst.

    Science.gov (United States)

    Keane, E F; Johnston, S; Bhandari, S; Barr, E; Bhat, N D R; Burgay, M; Caleb, M; Flynn, C; Jameson, A; Kramer, M; Petroff, E; Possenti, A; van Straten, W; Bailes, M; Burke-Spolaor, S; Eatough, R P; Stappers, B W; Totani, T; Honma, M; Furusawa, H; Hattori, T; Morokuma, T; Niino, Y; Sugai, H; Terai, T; Tominaga, N; Yamasaki, S; Yasuda, N; Allen, R; Cooke, J; Jencson, J; Kasliwal, M M; Kaplan, D L; Tingay, S J; Williams, A; Wayth, R; Chandra, P; Perrodin, D; Berezina, M; Mickaliger, M; Bassa, C

    2016-02-25

    In recent years, millisecond-duration radio signals originating in distant galaxies appear to have been discovered in the so-called fast radio bursts. These signals are dispersed according to a precise physical law and this dispersion is a key observable quantity, which, in tandem with a redshift measurement, can be used for fundamental physical investigations. Every fast radio burst has a dispersion measurement, but none before now have had a redshift measurement, because of the difficulty in pinpointing their celestial coordinates. Here we report the discovery of a fast radio burst and the identification of a fading radio transient lasting ~6 days after the event, which we use to identify the host galaxy; we measure the galaxy's redshift to be z = 0.492 ± 0.008. The dispersion measure and redshift, in combination, provide a direct measurement of the cosmic density of ionized baryons in the intergalactic medium of ΩIGM = 4.9 ± 1.3 per cent, in agreement with the expectation from the Wilkinson Microwave Anisotropy Probe, and including all of the so-called 'missing baryons'. The ~6-day radio transient is largely consistent with the radio afterglow of a short γ-ray burst, and its existence and timescale do not support progenitor models such as giant pulses from pulsars, and supernovae. This contrasts with the interpretation of another recently discovered fast radio burst, suggesting that there are at least two classes of bursts.

  9. What is that Thing Called Computer Science?

    Directory of Open Access Journals (Sweden)

    Nadya Schokosva

    2013-07-01

    Full Text Available XXI century society, called Knowledge Society, has a direct dependency of the software products, considered by many as the most important development of modern technology. This dependence generates the need of scientists and professionals who research and develop products that meet social demands. This article describes the computer science area as one of the most demanded professions in this reality, and in order to make it known to more people.

  10. Aircraft noise monitoring hardware platform design based on software radio technology at civil airport%基于软件无线电的民用机场航空器噪声监测硬件平台设计

    Institute of Scientific and Technical Information of China (English)

    魏麟; 李忠良; 王冲; 刘晔璐

    2016-01-01

    Civil aircraft noise is a major factor in the civil airport noise. For the civil aviation airport noise characteristics, a concrete realization of airport noise signal monitoring and processing center hardware platform architecture is proposed. By using high-speed large-capacity FPGA programmable logic devices, PowerPC embedded processors, PCI-e, and SRIO (RapidIO) high-speed IO technology, constructed based on software radio technology hardware platform to achieve a higher real-time processing and monitoring platform highly reconfigurable.%民用航空器噪声是民用机场噪声的主要因素。针对民用机场航空器噪声的特点,提出了一种具体实现民用机场航空器噪声信号监测及处理中心的硬件平台架构。通过使用高速大容量FPGA可编程逻辑器件、PowerPC嵌入式处理器、PCI-e和SRIO(RapidIO)高速IO技术,构建了基于软件无线电技术的硬件平台,实现了监测平台的较高实时处理能力和高度可重构性。

  11. Dynamically Reconfigurable FFTs for Cognitive Radio on a Multiprocessor Platform

    NARCIS (Netherlands)

    Zhang, Qiwei; Walters, K.H.G.; Kokkeler, A.B.J.; Smit, G.J.M.

    2008-01-01

    Multiprocessor platforms have been proposed as an enabling technology for Cognitive Radio. In this paper, we explore various FFT implementations on a multiprocessor prototype platform as building components for OFDM based Cognitive Radio. The results show that our FFT implementations on the multipro

  12. Cognitive Radio baseband processing on a reconfigurable platform

    NARCIS (Netherlands)

    Zhang, Qiwei; Kokkeler, A.B.J.; Smit, G.J.M.; Walters, K.H.G.; Zhang, Qiwei

    2009-01-01

    Cognitive Radio is considered as a promising technology to address the paradox of spectrum scarcity and spectrum under-utilization. It has to operate in different bands under various data rates and combat adversary channel conditions. Therefore, Cognitive Radio needs an adaptive physical layer which

  13. Territorial calls in the Little Owl (Athene noctua): spatial dispersion and social interplay of mates and neighbours

    DEFF Research Database (Denmark)

    Jacobsen, Lars Bo; Sunde, Peter; Rahbek, Carsten

    2013-01-01

    With the aim of quantifying spatio-temporal and social factors affecting territorial calls in LittleOwls,we collected data on the calling behaviour of radio tracked individuals from a low-density population in Northern Jutland, Denmark. There was considerable seasonal variation in calling activit...

  14. 78 FR 4369 - Rates for Interstate Inmate Calling Services

    Science.gov (United States)

    2013-01-22

    ... pros or cons of debit calling? We seek comment on ICS providers' overall experiences with offering... technologies by ICS providers impacts our analysis under section 276 of the Act. To what extent are providers currently utilizing VoIP technology to provide ICS? Would the use of VoIP technology affect the authority...

  15. Calling patterns in human communication dynamics

    CERN Document Server

    Jiang, Zhi-Qiang; Li, Ming-Xia; Podobnik, Boris; Zhou, Wei-Xing; Stanley, H Eugene; 10.1073/pnas.1220433110

    2013-01-01

    Modern technologies not only provide a variety of communication modes, e.g., texting, cellphone conversation, and online instant messaging, but they also provide detailed electronic traces of these communications between individuals. These electronic traces indicate that the interactions occur in temporal bursts. Here, we study the inter-call durations of the 100,000 most-active cellphone users of a Chinese mobile phone operator. We confirm that the inter-call durations follow a power-law distribution with an exponential cutoff at the population level but find differences when focusing on individual users. We apply statistical tests at the individual level and find that the inter-call durations follow a power-law distribution for only 3460 individuals (3.46%). The inter-call durations for the majority (73.34%) follow a Weibull distribution. We quantify individual users using three measures: out-degree, percentage of outgoing calls, and communication diversity. We find that the cellphone users with a power-law...

  16. Direct Broadcast Satellite: Radio Program

    Science.gov (United States)

    Hollansworth, James E.

    1992-01-01

    NASA is committed to providing technology development that leads to the introduction of new commercial applications for communications satellites. The Direct Broadcast Satellite-Radio (DBS-R) Program is a joint effort between The National Aeronautics and Space Administration (NASA) and The United States Information Agency/Voice of America (USIA/VOA) directed at this objective. The purpose of this program is to define the service and develop the technology for a direct-to-listener satellite sound broadcasting system. The DBS-R Program, as structured by NASA and VOA, is now a three-phase program designed to help the U.S. commercial communications satellite and receiver industry bring about this new communications service. Major efforts are being directed towards frequency planning hardware and service development, service demonstration, and experimentation with new satellite and receiver technology.

  17. Post-Coma Persons with Extensive Multiple Disabilities Use Microswitch Technology to Access Selected Stimulus Events or Operate a Radio Device

    Science.gov (United States)

    Lancioni, Giulio E.; Singh, Nirbhay N.; O'Reilly, Mark F.; Sigafoos, Jeff; Alberti, Gloria; Oliva, Doretta; Megna, Gianfranco; Iliceto, Carla; Damiani, Sabino; Ricci, Irene; Spica, Antonella

    2011-01-01

    The present two studies extended research evidence on the use of microswitch technology by post-coma persons with multiple disabilities. Specifically, Study I examined whether three adults with a diagnosis of minimally conscious state and multiple disabilities could use microswitches as tools to access brief, selected stimulus events. Study II…

  18. Post-Coma Persons with Extensive Multiple Disabilities Use Microswitch Technology to Access Selected Stimulus Events or Operate a Radio Device

    Science.gov (United States)

    Lancioni, Giulio E.; Singh, Nirbhay N.; O'Reilly, Mark F.; Sigafoos, Jeff; Alberti, Gloria; Oliva, Doretta; Megna, Gianfranco; Iliceto, Carla; Damiani, Sabino; Ricci, Irene; Spica, Antonella

    2011-01-01

    The present two studies extended research evidence on the use of microswitch technology by post-coma persons with multiple disabilities. Specifically, Study I examined whether three adults with a diagnosis of minimally conscious state and multiple disabilities could use microswitches as tools to access brief, selected stimulus events. Study II…

  19. Reconfigurable, Cognitive Software-Defined Radio

    Science.gov (United States)

    Bhat, Arvind

    2015-01-01

    Software-defined radio (SDR) technology allows radios to be reconfigured to perform different communication functions without using multiple radios to accomplish each task. Intelligent Automation, Inc., has developed SDR platforms that switch adaptively between different operation modes. The innovation works by modifying both transmit waveforms and receiver signal processing tasks. In Phase I of the project, the company developed SDR cognitive capabilities, including adaptive modulation and coding (AMC), automatic modulation recognition (AMR), and spectrum sensing. In Phase II, these capabilities were integrated into SDR platforms. The reconfigurable transceiver design employs high-speed field-programmable gate arrays, enabling multimode operation and scalable architecture. Designs are based on commercial off-the-shelf (COTS) components and are modular in nature, making it easier to upgrade individual components rather than redesigning the entire SDR platform as technology advances.

  20. Los Alamos National Laboratory: Request for Information (RFI) – Call for Commercialization Partners on behalf of the Department of Energy’s Fuel Cell Technologies Office (FCTO) L’Innovator Pilot Program

    Energy Technology Data Exchange (ETDEWEB)

    Barber, Laura Jeaneen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-01-19

    The purpose of the L’Innovator is to assemble unique, state-of-the-art IP bundles developed at the national labs that aggregate synergistic technologies in furtherance of the emerging hydrogen and fuel cell market. The first L’Innovator IP bundle consists of Oxygen Reduction Reaction (ORR) Catalyst technology developed at Brookhaven National Laboratory (BNL), combined with Membrane Electrode Assembly (MEA) technology developed at Los Alamos National Laboratory (LANL).

  1. Application of Affect to CALL

    Institute of Scientific and Technical Information of China (English)

    李露

    2006-01-01

    This essay mainly attempts to discuss some affective factors in CALL, with focus on affective influence on English (foreign language) learning and thus concludes that in the process of CALL related affect should be activated and made good use of to better foreign language teaching and learning.

  2. Analisis Kendala Perizinan Spektrum Frekuensi Radio untuk Radio Komunitas

    Directory of Open Access Journals (Sweden)

    Sri Wahyuningsih

    2014-03-01

    Full Text Available Izin penggunaan spektrum frekuensi radio diatur dalam Undang-undang No.36 tahun 1999 tentang Telekomunikasi. Saat ini masih ditemukan Radio Komunitas yang belum memiliki Izin Stasiun Radio (ISR. Penelitian ini bertujuan untuk menemu kenali kendala-kendala yang dihadapi Radio Komunitas pada proses pengajuan Izin Stasiun Radio (ISR. Teknik pengumpulan data melalui wawancara dengan penanggungjawab Radio Komunitas dan pejabat di lingkungan Balai Monitor Frekuensi Radio (Balmon di Jakarta, Semarang dan Yogyakarta. Analisis data mengacu pada model Matthew B Miles dan A Michael Huberman. Hasil penelitian menyatakan kendala yang dihadapi terutama pada sertifikasi perangkat Radio Komunitas.

  3. The difficult medical emergency call

    DEFF Research Database (Denmark)

    Møller, Thea Palsgaard; Kjærulff, Thora Majlund; Viereck, Søren

    2017-01-01

    BACKGROUND: Pre-hospital emergency care requires proper categorization of emergency calls and assessment of emergency priority levels by the medical dispatchers. We investigated predictors for emergency call categorization as "unclear problem" in contrast to "symptom-specific" categories and the ......BACKGROUND: Pre-hospital emergency care requires proper categorization of emergency calls and assessment of emergency priority levels by the medical dispatchers. We investigated predictors for emergency call categorization as "unclear problem" in contrast to "symptom-specific" categories...... and the effect of categorization on mortality. METHODS: Register-based study in a 2-year period based on emergency call data from the emergency medical dispatch center in Copenhagen combined with nationwide register data. Logistic regression analysis (N = 78,040 individuals) was used for identification...

  4. The difficult medical emergency call

    DEFF Research Database (Denmark)

    Møller, Thea Palsgaard; Kjærulff, Thora Majlund; Viereck, Søren

    2017-01-01

    BACKGROUND: Pre-hospital emergency care requires proper categorization of emergency calls and assessment of emergency priority levels by the medical dispatchers. We investigated predictors for emergency call categorization as "unclear problem" in contrast to "symptom-specific" categories and the ......BACKGROUND: Pre-hospital emergency care requires proper categorization of emergency calls and assessment of emergency priority levels by the medical dispatchers. We investigated predictors for emergency call categorization as "unclear problem" in contrast to "symptom-specific" categories...... and the effect of categorization on mortality. METHODS: Register-based study in a 2-year period based on emergency call data from the emergency medical dispatch center in Copenhagen combined with nationwide register data. Logistic regression analysis (N = 78,040 individuals) was used for identification...

  5. Spectrum access and management for cognitive radio networks

    CERN Document Server

    2017-01-01

    This book presents cutting-edge research contributions that address various aspects of network design, optimization, implementation, and application of cognitive radio technologies. It demonstrates how to make better utilization of the available spectrum, cognitive radios and spectrum access to achieve effective spectrum sharing between licensed and unlicensed users. The book provides academics and researchers essential information on current developments and future trends in cognitive radios for possible integration with the upcoming 5G networks. In addition, it includes a brief introduction to cognitive radio networks for newcomers to the field.

  6. Management of Distributed and Extendible Heterogeneous Radio Architectures

    DEFF Research Database (Denmark)

    Ramkumar, Venkata; Mihovska, Albena D.; Prasad, Neeli R.

    2009-01-01

    resources; a process that associates a large number of parameters and quality/performance indicators that need to be set, measured, analyzed, and optimized. Radio-over-fiber (RoF) technology involves the use of optical fiber links to distribute radio frequency (RF) signals from a central location to remote...... access units (RAUs). In order to increase the radio coverage and capacity, this paper proposes a radio resource management (RRM) framework that takes advantage of an RoF centralized topology and can serve a large number of heterogeneous RAUs. The proposed framework is described in terms of physical...

  7. Radio protocols for LTE and LTE-advanced

    CERN Document Server

    Yi, SeungJune; Lee, YoungDae; Park, SungJun; Jung, SungHoon

    2012-01-01

    Provides a unique focus on radio protocols for LTE and LTE-Advanced (LTE-A) Giving readers a valuable understanding of LTE radio protocols, this book covers LTE (Long-Term Evolution) Layer 2/3 radio protocols as well as new features including LTE-Advanced. It is divided into two sections to differentiate between the two technologies' characteristics. The authors systematically explain the design principles and functions of LTE radio protocols during the development of mobile handsets. The book also provides essential knowledge on the interaction between mobile networks a

  8. World Administrative Radio Conference. Issues for US International Spectrum Policy

    Science.gov (United States)

    1991-11-01

    U.S. preparations for the 1992 World Administrative Radio Conference to be held in Spain, February 1992 are examined. WARC-92 will attempt to reassign radio frequencies internationally in order to take advantage of new radio-based technologies and applications, such as digital audio broadcasting, high definition television, and personal communications services, while still accommodating the needs of existing users and services. The impacts of the realignment will be felt throughout the U.S. economy and around the world, and the agreements reached at WARC-92 will influence the development of radio-based systems and services well into the next century.

  9. Radio Emission from Exoplanets

    OpenAIRE

    George, Samuel J.; Stevens, Ian R.

    2008-01-01

    We present results from new low frequency observations of two extrasolar planetary systems (Epsilon Eridani and HD128311) taken at 150 MHz with the Giant Metrewave Radio Telescope (GMRT). We do not detect either system, but are able to place tight upper limits on their low frequency radio emission.

  10. Valuing commercial radio licences

    NARCIS (Netherlands)

    Kerste, M.; Poort, J.; van Eijk, N.

    2015-01-01

    Within the EU regulatory framework, licensees for commercial radio broadcasting may be charged a fee to ensure optimal allocation of scarce resources but not to maximize public revenues. While radio licence renewal occurs in many EU countries, an objective, model-based approach for setting licence f

  11. 射频识别技术在井下工具中的应用与发展%Application and Development of Petroleum Downhole Tools Based on Radio Frequency Identification Technology

    Institute of Scientific and Technical Information of China (English)

    刘清友; 张安琪; 黎伟

    2015-01-01

    为促进我国射频识别技术在智能化钻完井领域的应用与发展,解决深井、超深井勘探开发中的技术瓶颈,拓宽井下工具的使用功能,调研了射频识别技术在石油工具中的应用现状。阐述了射频识别技术的工作原理与技术特点,在非常规油气藏钻完井开发中引入射频识别技术,可大幅提高井下工具的工作效率,缩短施工周期,降低施工成本。介绍了国外射频识别技术在油田钻具监测管理、钻井扩眼工具、压裂滑套工具中的典型应用。针对射频识别技术的关键性难题,展望了该技术在未来石油装备及工具中的发展趋势,对促进该技术在石油工具智能化方面的应用具有重要意义。%To promote the application and development of RFID (radio frequency identification) technology in the field of intelligent drilling and completion in our country,and resolve the bottle-neck problems in the exploration and development of deep/ultra-deep wells,and widen the func-tional use of petroleum downhole tools,the application status of RFID technology in petroleum e-quipment and tools were investigated.The working principle and technical characteristics of RFID technology are explained in this paper.While introducing RFID technology in unconventional res-ervoirs development drilling and completion,it could greatly improve downhole work efficiency, shorten the construction period,and reduce construction cost.The typical applications of foreign RFID technology in the oilfield drilling monitoring and management,drilling reaming tools and sleeve fracturing tools are introduced.With reference to the key technical problems of RFID tech-nology,the prospect of RFID technology in the future petroleum equipment and tools are sugges-ted.This paper is of significance to promote the realization of intelligent tools in petroleum equip-ment field of our country.

  12. Radio-flaring Ultracool Dwarf Population Synthesis

    Science.gov (United States)

    Route, Matthew

    2017-08-01

    Over a dozen ultracool dwarfs (UCDs), low-mass objects of spectral types ≥M7, are known to be sources of radio flares. These typically several-minutes-long radio bursts can be up to 100% circularly polarized and have high brightness temperatures, consistent with coherent emission via the electron cyclotron maser operating in approximately kilogauss magnetic fields. Recently, the statistical properties of the bulk physical parameters that describe these UCDs have become described adequately enough to permit synthesis of the population of radio-flaring objects. For the first time, I construct a Monte Carlo simulator to model the population of these radio-flaring UCDs. This simulator is powered by Intel Secure Key (ISK), a new processor technology that uses a local entropy source to improve random number generation that has heretofore been used to improve cryptography. The results from this simulator indicate that only ∼5% of radio-flaring UCDs within the local interstellar neighborhood (radio-flaring fraction and suggest that the observed behavior is likely a result of several factors. The performance of ISK as compared to other pseudorandom number generators is also evaluated, and its potential utility for other astrophysical codes is briefly described.

  13. Medium-Sized Mammals around a Radioactive Liquid Waste Lagoon at Los Alamos National Laboratory: Uptake of Contaminants and Evaluation of Radio-Frequency Identification Technology

    Energy Technology Data Exchange (ETDEWEB)

    Leslie A. Hansen; Phil R. Fresquez; Rhonda J. Robinson; John D. Huchton; Teralene S. Foxx

    1999-11-01

    Use of a radioactive liquid waste lagoon by medium-sized mammals and levels of tritium, other selected radionuclides, and metals in biological tissues of the animals were documented at Technical Area 53 (TA-53) of Los Alamos National Laboratory during 1997 and 1998. Rock squirrel (Spermophilus variegates), raccoon (Procyon lotor), striped skunk (Mephitis mephitis), and bobcat (Lynx rufus) were captured at TA-53 and at a control site on the Santa Fe National Forest. Captured animals were anesthetized and marked with radio-frequency identification (RFD) tags and/or ear tags. We collected urine and hair samples for tritium and metals (aluminum, antimony, arsenic, barium, beryllium, cadmium, chromium, copper, lead, mercury, nickel, selenium, silver, and thallium) analyses, respectively. In addition, muscle and bone samples from two rock squirrels collected from each of TA-53, perimeter, and regional background sites were tested for tritium, {sup 137}Cs, {sup 90}Sr, {sup 238}Pu, {sup 239,240}Pu, {sup 241}Am, and total uranium. Animals at TA-53 were monitored entering and leaving the lagoon area using a RFID monitor to read identification numbers from the RFID tags of marked animals and a separate camera system to photograph all animals passing through the monitor. Cottontail rabbit (Sylvilagus spp.), rock squirrel, and raccoon were the species most frequently photographed going through the RFID monitor. Less than half of all marked animals in the lagoon area were detected using the lagoon. Male and female rock squirrels from the lagoon area had significantly higher tritium concentrations compared to rock squirrels from the control area. Metals tested were not significantly higher in rock squirrels from TA-53, although there was a trend toward increased levels of lead in some individuals at TA-53. Muscle and bone samples from squirrels in the lagoon area appeared to have higher levels of tritium, total uranium, and {sup 137}Cs than samples collected from perimeter and

  14. A Radio Tag for Big Whales

    Science.gov (United States)

    Watkins, William A.

    1978-01-01

    Radio tags to track wildlife have been used for years. However, such tagging of whales has been more complicated and less successful. This article explores the latest technology that is designed to give information over a long period of time. (MA)

  15. Spanish Basic Course: Radio Communications Procedures, USAF.

    Science.gov (United States)

    Defense Language Inst., Washington, DC.

    This guide to radio communication procedures is offered in Spanish and English as a means of securing a closer working relationship among United States Air Force personnel and Latin American aviators and technicians. Eight dialogues concerning routine flight procedures and aerospace technology are included. It is suggested that two rated students…

  16. A Radio Tag for Big Whales

    Science.gov (United States)

    Watkins, William A.

    1978-01-01

    Radio tags to track wildlife have been used for years. However, such tagging of whales has been more complicated and less successful. This article explores the latest technology that is designed to give information over a long period of time. (MA)

  17. A Fast Radio Burst Host Galaxy

    CERN Document Server

    Keane, E F; Bhandari, S; Barr, E; Bhat, N D R; Burgay, M; Caleb, M; Flynn, C; Jameson, A; Kramer, M; Petroff, E; Possenti, A; van Straten, W; Bailes, M; Burke-Spolaor, S; Eatough, R P; Stappers, B W; Totani, T; Honma, M; Furusawa, H; Hattori, T; Morokuma, T; Niino, Y; Sugai, H; Terai, T; Tominaga, N; Yamasaki, S; Yasuda, N; Allen, R; Cooke, J; Jencson, J; Kasliwal, M M; Kaplan, D L; Tingay, S J; Williams, A; Wayth, R; Chandra, P; Perrodin, D; Berezina, M; Mickaliger, M; Bassa, C

    2016-01-01

    In recent years, millisecond duration radio signals originating from distant galaxies appear to have been discovered in the so-called Fast Radio Bursts. These signals are dispersed according to a precise physical law and this dispersion is a key observable quantity which, in tandem with a redshift measurement, can be used for fundamental physical investigations. While every fast radio burst has a dispersion measurement, none before now have had a redshift measurement, due to the difficulty in pinpointing their celestial coordinates. Here we present the discovery of a fast radio burst and the identification of a fading radio transient lasting $\\sim 6$ days after the event, which we use to identify the host galaxy; we measure the galaxy's redshift to be $z=0.492\\pm0.008$. The dispersion measure and redshift, in combination, provide a direct measurement of the cosmic density of ionised baryons in the intergalactic medium of $\\Omega_{\\mathrm{IGM}}=4.9 \\pm 1.3\\%$, in agreement with the expectation from WMAP, and i...

  18. Indoor Positioning with Radio Location Fingerprinting

    CERN Document Server

    Kjærgaard, Mikkel Baun

    2010-01-01

    An increasingly important requirement for many novel applications is sensing the positions of people, equipment, etc. GPS technology has proven itself as a successfull technology for positioning in outdoor environments but indoor no technology has yet gained a similar wide-scale adoption. A promising indoor positioning technique is radio-based location fingerprinting, having the major advantage of exploiting already existing radio infrastructures, like IEEE 802.11, which avoids extra deployment costs and effort. The research goal of this thesis is to address the limitations of current indoor location fingerprinting systems. In particular the aim is to advance location fingerprinting techniques for the challenges of handling heterogeneous clients, scalability to many clients, and interference between communication and positioning. The wireless clients used for location fingerprinting are heterogeneous even when only considering clients for the same technology. Heterogeneity is a challenge for location fingerpr...

  19. Hardware Architecture Study for NASA's Space Software Defined Radios

    Science.gov (United States)

    Reinhart, Richard C.; Scardelletti, Maximilian C.; Mortensen, Dale J.; Kacpura, Thomas J.; Andro, Monty; Smith, Carl; Liebetreu, John

    2008-01-01

    This study defines a hardware architecture approach for software defined radios to enable commonality among NASA space missions. The architecture accommodates a range of reconfigurable processing technologies including general purpose processors, digital signal processors, field programmable gate arrays (FPGAs), and application-specific integrated circuits (ASICs) in addition to flexible and tunable radio frequency (RF) front-ends to satisfy varying mission requirements. The hardware architecture consists of modules, radio functions, and and interfaces. The modules are a logical division of common radio functions that comprise a typical communication radio. This paper describes the architecture details, module definitions, and the typical functions on each module as well as the module interfaces. Trade-offs between component-based, custom architecture and a functional-based, open architecture are described. The architecture does not specify the internal physical implementation within each module, nor does the architecture mandate the standards or ratings of the hardware used to construct the radios.

  20. Radio on the Other Side of Time

    Directory of Open Access Journals (Sweden)

    Alicia TAPIA LÓPEZ

    2016-06-01

    Full Text Available On October 30, 1938, Orson Welles aired the radio drama The War of the Worlds on the CBS Radio network, adapting the science-fiction novel by the British writer H. G. Wells. During the broadcast, listeners became stricken with panic, believing that the Earth was actually being invaded by giant snake-like Martians launching rays of fire down on humans. Welles was a groundbreaking figure whose trickery exploited the technological novelty of the radio to its fullest, adapting classic texts in ways that exploited the opportunities afforded by this new medium. Over the years, this radio classic has been adapted a number of times, though none has seized on the technological advances of our times. Drawing on the most salient innovations seen in Internet radio, this article creates an imaginary scenario that replicates Orson Welles’s work in the present day, when the Internet has become a channel for broadcasting and hyperlinks have brought different media together. The text is an exploration of the other side of time, where transmedia storytelling facilitates the exchange of stories among consumers, and broadcast programming is no longer linear.

  1. The Cost-Effectiveness of Interactive Radio Instruction for Improving Primary School Instruction in Honduras, Bolivia and Lesotho.

    Science.gov (United States)

    Tilson, Thomas D.; And Others

    Findings are presented from studies on the use of radio for teaching primary school children mathematics in Honduras and Bolivia and English as a Second Language in Lesotho. Interactive radio instruction (IRI) is so called because of the active participation of the students. Although lessons are presented by conventional radio, scripts are written…

  2. The Extended GMRT Radio Halo Survey I: New upper limits on radio halos and mini-halos

    CERN Document Server

    Kale, R; Giacintucci, S; Dallacasa, D; Cassano, R; Brunetti, G; Macario, G; Athreya, R

    2013-01-01

    A fraction of galaxy clusters host diffuse radio sources called radio halos, radio relics and mini-halos. We present the sample and first results from the Extended GMRT Radio Halo Survey (EGRHS)- an extension of the GMRT Radio Halo Survey (GRHS, Venturi et al. 2007, 2008). It is a systematic radio survey of galaxy clusters selected from the REFLEX and eBCS X-ray catalogs . Analysis of GMRT data at 610/ 235/ 325 MHz on 12 galaxy clusters are presented. We report the detection of a newly discovered mini-halo in the cluster RXJ1532.9+3021 at 610 MHz. A small scale relic (~200 kpc) is suspected in the cluster Z348. We do not detect cluster-scale diffuse emission in 11 clusters. Robust upper limits on the detection of radio halo of size of 1 Mpc are determined. We also present upper limits on the detections of mini-halos in a sub-sample of cool-core clusters. The upper limits for radio halos and mini-halos are plotted in the radio power- X-ray luminosity plane and the correlations are discussed. Diffuse extended e...

  3. A proposed space mission around the Moon to measure the Moon Radio-Quiet Zone

    Science.gov (United States)

    Antonietti, N.; Pagana, G.; Pluchino, S.; Maccone, C.

    In a series of papers published since 2000 mainly in Acta Astronautica the senior author Maccone dealt with the advantages of the Farside of the Moon for future utilization Clearly the Moon Farside is free from RFI Radio Frequency Interference produced in larger and larger amounts by the increasing human exploitation of radio technologies That author suggested that crater Daedalus located at the center of the Farside was the best possible location to build up in the future one or more radiotelescopes or phased arrays to achieve the maximum sensitivity in radioastronomical and SETI searches Also a radio-quiet region of space above the Farside of the Moon exists and is called the Quiet Cone The Quiet Cone actual size however is largely unknown since it depends on the orbits of radio-emitting satellites around the Earth that are themselves largely unknown due to the military involvements In addition diffraction of electromagnetic waves grazing the surface of the Moon causes further changes in the geometrical shape of the Quiet Cone This riddle can be solved only by direct measurements of the radio attenuation above the Farside of the Moon performed by satellites orbiting the Moon itself In this paper we propose to let one or more low cost radiometers be put into orbit around the Moon to measure the RFI attenuation at different frequencies and altitudes above the Moon The opportunity of adding more payload s such as an ion detector and or a temperature sensor is evaluated also In this regard we present in this paper the experience gained by

  4. 电力光载无线宽带接入技术研究%Radio-on-fiber broadband access technology in power communication

    Institute of Scientific and Technical Information of China (English)

    许盛; 曾强; 易浩勇; 刘柱

    2011-01-01

    Combined with the fiber-optic communications and the wireless communication technologies ad-vantage,Rof communication is a good way to solve the problems of bandwidth flexibility security and the electromagnetic interference. With the construction of smart grid carry out, the communication demands of bandwidth, stability and reliability have been increasing, research the RoF technology,based on the EPON net-work,focusing on the system downlink transmission protocol,using the existing EPON network to get the wireless nodes together. The RoF could combine the advantages of fiber and wireless, and provide the air interface services for the end-users, meeting the needs of power communication, while reducing communication costs.The Practical application field testing of Hybrid-optical-wireless proves the feasibility of the technology's performance.%光载无线技术结合光纤通信和无线移动通信的技术优势,可以较好地解决带宽、灵活性和电磁干扰问题.随着我国智能电网建设的展开,对通信带宽、稳定性和接入可靠性的要求越来越高.研究基于电力EPON的光载无线宽带接入技术,重点是系统上下行传输协议.用现有的电力EPON网络汇聚无线节点,结合光和无线两者的优势,为终端用户提供空中接口服务,可以在满足电力通信需求的同时减少成本.通过现场实际应用测试证明了该技术的性能和可行性.

  5. The use of Computer Assisted Language Learning (CALL) Devices ...

    African Journals Online (AJOL)

    The use of Computer Assisted Language Learning (CALL) Devices in ... role of information and communication technologies in language learning and teaching. ... Classroom implications and applications for the effective Computer Assisted ...

  6. Learner Attitudes towards CALL Applications at YADIM

    Directory of Open Access Journals (Sweden)

    Zuhal OKAN & Pınar TORUN

    2007-12-01

    Full Text Available The use of educational technology to assist learners in their language studies has become agreat concern for scholars over the past decade. YADIM (School for Foreign Languages at ÇukurovaUniversity in Turkey has invested substantially to introduce students to computer-based languagelearning materials and to integrate technology into existing curriculum. This paper reports on attitudesof YADİM students towards the use of computer-assisted language learning (CALL and theirperceptions on CALL’s relevancy to their regular classroom work. Surveys and follow-up interviewsexplored how learners see the role of the instructor and the accessibility of the labs. The paper alsolooks at how students assess the impact of technology on their language learning process.

  7. Learner Attitudes towards CALL Applications at YADIM

    Directory of Open Access Journals (Sweden)

    Zuhal OKAN & Pınar TORUN

    2014-01-01

    Full Text Available The use of educational technology to assist learners in their language studies has become agreat concern for scholars over the past decade. YADIM (School for Foreign Languages at ÇukurovaUniversity in Turkey has invested substantially to introduce students to computer-based languagelearning materials and to integrate technology into existing curriculum. This paper reports on attitudesof YADİM students towards the use of computer-assisted language learning (CALL and theirperceptions on CALL’s relevancy to their regular classroom work. Surveys and follow-up interviewsexplored how learners see the role of the instructor and the accessibility of the labs. The paper alsolooks at how students assess the impact of technology on their language learning process.

  8. An Examination of Application of Artificial Neural Network in Cognitive Radios

    Science.gov (United States)

    Bello Salau, H.; Onwuka, E. N.; Aibinu, A. M.

    2013-12-01

    Recent advancement in software radio technology has led to the development of smart device known as cognitive radio. This type of radio fuses powerful techniques taken from artificial intelligence, game theory, wideband/multiple antenna techniques, information theory and statistical signal processing to create an outstanding dynamic behavior. This cognitive radio is utilized in achieving diverse set of applications such as spectrum sensing, radio parameter adaptation and signal classification. This paper contributes by reviewing different cognitive radio implementation that uses artificial intelligence such as the hidden markov models, metaheuristic algorithm and artificial neural networks (ANNs). Furthermore, different areas of application of ANNs and their performance metrics based approach are also examined.

  9. Spectrometers and Polyphase Filterbanks in Radio Astronomy

    CERN Document Server

    Price, Danny C

    2016-01-01

    This review gives an introduction to spectrometers and discusses their use within radio astronomy. While a variety of technologies are introduced, particular emphasis is given to digital systems. Three different types of digital spectrometers are discussed: autocorrelation spectrometers, Fourier transform spectrometers, and polyphase filterbank spectrometers. Given their growing ubiquity and significant advantages, polyphase filterbanks are detailed at length. The relative advantages and disadvantages of different spectrometer technologies are compared and contrasted, and implementation considerations are presented.

  10. The Radio Meteor Zoo: a citizen science project

    Science.gov (United States)

    Calders, S.; Verbeeck, C.; Lamy, H.; Martínez Picar, A.

    2016-01-01

    Scientists from the BRAMS radio meteor network have started a citizen science project called Radio Meteor Zoo in collaboration with Zooniverse in order to identify meteor reflections in BRAMS spectrograms. First, a small-scale version of the Radio Meteor Zoo was carried out with a sample of meteor identifications in 12 spectrograms by 35 volunteers. Results are presented here and allowed us to define a method that reliably detects meteor reflections based on the identifications by the volunteers. It turns out that, if each spectrogram is inspected by 10 volunteers, hit and false detection percentages of 95% respectively 6% are expected. The Radio Meteor Zoo is online at https://www.zooniverse.org/projects/zooniverse/radio-meteor-zoo. Citizen scientists are kindly invited to inspect spectrograms.

  11. International Agreement Will Advance Radio Astronomy

    Science.gov (United States)

    2007-12-01

    Two of the world's leading astronomical institutions have formalized an agreement to cooperate on joint efforts for the technical and scientific advancement of radio astronomy. The National Radio Astronomy Observatory (NRAO) in the United States and the Max-Planck Institute for Radioastronomy (MPIfR) in Germany concluded a Memorandum of Understanding outlining planned collaborative efforts to enhance the capabilities of each other's telescopes and to expand their cooperation in scientific research. The VLBA The VLBA CREDIT: NRAO/AUI/NSF In the first project pursued under this agreement, the MPIfR will contribute $299,000 to upgrade the continent-wide Very Long Baseline Array's (VLBA) capability to receive radio emissions at a frequency of 22 GHz. This improvement will enhance the VLBA's scientific productivity and will be particularly important for cutting-edge research in cosmology and enigmatic cosmic objects such as gamma-ray blazars. "This agreement follows many years of cooperation between our institutions and recognizes the importance of international collaboration for the future of astronomical research," said Fred K.Y. Lo, NRAO Director. "Our two institutions have many common research goals, and joining forces to keep all our telescopes at the forefront of technology will be highly beneficial for the science," said Anton Zensus, Director at MPIfR. In addition to the VLBA, the NRAO operates the Very Large Array (VLA) in New Mexico and the Robert C. Byrd Green Bank Telescope (GBT) in West Virginia. The MPIfR operates the 100-meter Effelsberg Radio Telescope in Germany and the 12-meter APEX submillimeter telescope in 5100 m altitude in the Cilean Atacama desert (together with the European Southern Observatory and the Swedish Onsala Space Observatory). With the 100-meter telescope, it is part of the VLBA network in providing transatlantic baselines. Both institutions are members of a global network of telescopes (the Global VLBI Network) that uses simultaneous

  12. Radio source evolution

    CERN Document Server

    Perucho, Manel

    2015-01-01

    Baldwin (1982) wrote that "the distribution of sources in the radio luminosity, P, overall physical size, D, diagram" could be considered as "the radio astronomer's H-R diagram". However, unlike the case of stars, not only the intrinsic properties of the jets, but also those of the host galaxy and the intergalactic medium are relevant to explain the evolutionary tracks of radio radio sources. In this contribution I review the current status of our understanding of the evolution of radio sources from a theoretical and numerical perspective, using the P-D diagram as a framework. An excess of compact (linear size < 10 kpc) sources could be explained by low-power jets being decelerated within the host galaxy, as shown by recent numerical simulations. These decelerated jets could also explain the population of the radio sources that have been recently classified as FR0. I will discuss the possible tracks that radio sources may follow within this diagram, and some of the physical processes that can explain the d...

  13. Smart packet access and call admission control for efficient resource management in advanced wireless networks

    OpenAIRE

    Phan, V. V. (Vinh V.)

    2005-01-01

    Abstract Efficient management of rather limited resources, including radio spectrum and mobile-terminal battery power, has been the fundamental design challenge of wireless networks and one of the most widespread research problems over the years. MAC (Medium Access Control) for packet access and CAC (Call Admission Control) for connection-oriented service domains are commonly used as effective tools to manage radio resources, capacity and performance of wireless networks while providing ad...

  14. Planeta Vivo Radio: a 365 chapter story between science and radio

    Science.gov (United States)

    Calvo, David; Villalba, Eustaquio; Rodríguez, Fátima; Álvarez, Domingo; Pérez, Nemesio M.

    2016-04-01

    PLANETA VIVO RADIO (http://www.planetavivoradio.es/) is a joint effort of the Spanish National Public Radio in the Canary Islands (RNE-Canarias) and Instituto Volcanológico de Canarias (INVOLCAN) to broadcast scientific and technological advances related to Earth Sciences and the Earth Planet. This initiative was born in a very special year, 2008, the International Year of the Planet Earth, and is actually co-financed by the Parque Científico y Tecnológico de Tenerife (PCTT) and co-financed by the PROCIVMAC project. This 50 minutes weekly radio program broadcast scientists' interviews and scientific/technological reports related to the state of the art of several topics of scientific and social interest in addition to a weekly report of natural hazards that have occurred in the Earth Planet during the last week turning "PLANETAVIVORADIO" as a milestone of the Earth Sciences for the society. Since that moment, Planeta Vivo Radio has been broadcasted through 365 weeks in a continuous way. Several modifications have been added to the program, being divided today into eight different parts, a mix with interviews, reports, ephemerals, bios, agenda and the review to the most prominent natural hazards occurring through the last seven days. Since October 2015, Planeta Vivo Radio is the longest science radio program ever broadcasted in the Canary Islands.

  15. Call for Papers: Special Issue

    African Journals Online (AJOL)

    Technology Innovation in Education Research ... social networking sites like Twitter and Facebook in addition to Wikipedia and YouTube in ... with expertise in a variety of fields in order to investigate the notion of 'technology innovation.

  16. STS-37 Pilot Cameron uses SAREX to communicate amateur radio operators

    Science.gov (United States)

    1991-01-01

    STS-37 Pilot Kenneth D. Cameron, wearing Shuttle Amateur Radio Experiment (SAREX) headset (HDST), communicates with amateur radio operators and students while on aft flight deck aboard Atlantis, Orbiter Vehicle (OV) 104. SAREX provided radio transmissions between ground based amateur radio operators around the world and Cameron (call sign KB5AWP) and the other crewmembers, all of whom are licensed amateur radio operators. SAREX enabled students from all over the United States to have a chance to communicate with an astronaut in space. The cloud-covered surface of the Earth is visible above Cameron framed in the overhead window W8.

  17. Radio broadcasting via satellite

    Science.gov (United States)

    Helm, Neil R.; Pritchard, Wilbur L.

    1990-10-01

    Market areas offering potential for future narrowband broadcast satellites are examined, including international public diplomacy, government- and advertising-supported, and business-application usages. Technical issues such as frequency allocation, spacecraft types, transmission parameters, and radio receiver characteristics are outlined. Service and system requirements, advertising revenue, and business communications services are among the economic issues discussed. The institutional framework required to provide an operational radio broadcast service is studied, and new initiatives in direct broadcast audio radio systems, encompassing studies, tests, in-orbit demonstrations of, and proposals for national and international commercial broadcast services are considered.

  18. Shoestring Budget Radio Astronomy

    Science.gov (United States)

    Hoot, John E.

    2017-06-01

    The commercial exploitation of microwave frequencies for cellular, WiFi, Bluetooth, HDTV, and satellite digital media transmission has brought down the cost of the components required to build an effective radio telescope to the point where, for the cost of a good eyepiece, you can construct and operate a radio telescope. This paper sets forth a family of designs for 1421 MHz telescopes. It also proposes a method by which operators of such instruments can aggregate and archive data via the Internet. With 90 or so instruments it will be possible to survey the entire radio sky for transients with a 24 hour cadence.

  19. Unlocking radio broadcasts

    DEFF Research Database (Denmark)

    Lykke, Marianne; Skov, Mette

    2012-01-01

    This poster reports the preliminary results of a user study uncovering the information seeking behaviour of humanities scholars dedicated to radio research. The study is part of an interdisciplinary research project on radio culture and auditory resources. The purpose of the study is to inform...... the design of information architecture and interaction design of a research infrastructure that will enable future radio and audio based research. Results from a questionnaire survey on humanities scholars’ research interest and information needs, preferred access points, and indexing levels are reported...

  20. Ionosphere and Radio Communication

    Indian Academy of Sciences (India)

    Saradi Bora

    2017-02-01

    The Earth's ionosphere consists of plasma produced by thephotoionization of thin upper atmospheric gases by UV raysand photons of short wavelength from the sun. The upperionosphere is used for radio communication and navigationas it reflects long, medium, as well as short radio waves. Sincesolar radiation is the main cause of the existence of ionosphere,any variation in the radiations can affect the entireradio communication system. This article attempts to brieflyintroduce the readers to the study of ionosphere in the contextof its use as a radio reflector, with particular reference toIndia.

  1. Radio y elecciones

    Directory of Open Access Journals (Sweden)

    Alma Rosa Alva de la Selva

    2000-01-01

    Full Text Available En este trabajo se analiza el comportamiento de la radio en México ante la contienda electoral de julio de 2000. Se examina el papel de la radio como espacio para la discusión política, así como el tratamiento informativo que hizo del tema. Asimismo, se analiza la posible repercusión de factores de reciente surgimiento en el panorama radiofónico para un manejo más autónomo de la información política en la radio

  2. Unlocking radio broadcasts

    DEFF Research Database (Denmark)

    Skov, Mette; Lykke, Marianne

    2012-01-01

    This poster reports the preliminary results of a user study uncovering the information seeking behaviour of humanities scholars dedicated to radio research. The study is part of an interdisciplinary research project on radio culture and auditory resources. The purpose of the study is to inform...... the design of information architecture and interaction design of a research infrastructure that will enable future radio and audio based research. Results from a questionnaire survey on humanities scholars‟ research interest and information needs, preferred access points, and indexing levels are reported...

  3. Radio Telescopes Will Add to Cassini-Huygens Discoveries

    Science.gov (United States)

    2004-12-01

    accuracy. They expect to measure the probe's position within two-thirds of a mile (1 kilometer) at a distance of nearly 750 million miles. "That's like being able to sit in your back yard and watch the ball in a ping-pong game being played on the Moon," said Leonid Gurvits of JIVE. Both the JPL and JIVE teams will record the data collected by the radio telescopes and process it later. In the case of the Doppler measurements, some real-time information may be available, depending on the strength of the signal, but the scientists on this team also plan to do their detailed analysis on recorded data. The JPL team is utilizing special instrumentation from the Deep Space Network called Radio Science Receivers. One will be loaned to the GBT and another to the Parkes radio observatory. "This is the same instrument that allowed us to support the challenging communications during the landing of the Spirit and Opportunity Mars rovers as well as the Cassini Saturn Orbit Insertion when the received radio signal was very weak," said Sami Asmar, the JPL scientist responsible for the data recording. When the Galileo spacecraft's probe entered Jupiter's atmosphere in 1995, a JPL team used the NSF's Very Large Array (VLA) radio telescope in New Mexico to directly track the probe's signal. Adding the data from the VLA to that experiment dramatically improved the accuracy of the wind-speed measurements. "The Galileo probe gave us a surprise. Contrary to some predictions, we learned that Jupiter's winds got stronger as we went deeper into its atmosphere. That tells us that those deeper winds are not driven entirely by sunlight, but also by heat coming up from the planet's core. If we get lucky at Titan, we'll get surprises there, too," said Robert Preston, another JPL scientist. The Huygens probe is a spacecraft built by the European Space Agency (ESA). In addition to the NRAO telescopes, the JPL Doppler Wind Experiment will use the Australia Telescope National Facility and other radio

  4. Designing CALL Tasks for College English Learners

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    <正>As CALL(Computer Assisted Language Learning) became a new trend among China’s college English learners nowadays,it is time that teachers reflected on their teaching methodology innovation with the new technological advancement,one part of it is writing CALL tasks for their own individual classes.This paper presents a few basic principles and rationales of designing such tasks,and hope to work as a reminder for task writers.These principles and rationales include how to realize CLT(communicative language teaching) and learner-centredness and foster learner autonomy.In order to achieve this,it is reminded that task writers pay attention to a few points,like the communicativeness,contextualization,authenticity,and relatedness in task writing. Aspects of syllabus design,choice of texts,contents of activities and tasks and sequencing are put under investigation.

  5. Cognitive Radio and its Application for Next Generation Cellular and Wireless Networks

    CERN Document Server

    Muntean, Gabriel-Miro

    2012-01-01

    This book provides a broad introduction to Cognitive Radio, which attempts to mimic human cognition and reasoning applied to Software Defined Radio and reconfigurable radio over wireless networks.  It provides readers with significant technical and practical insights into different aspects of Cognitive Radio, starting from a basic background, the principle behind the technology, the inter-related technologies and application to cellular and vehicular networks, the technical challenges, implementation and future trends.  The discussion balances theoretical concepts and practical implementation. Wherever feasible, the different concepts explained are linked to application of the corresponding scheme in a particular wireless standard.     This book has two sections: the first section begins with an introduction to cognitive radio and discusses in detail various, inter-dependent technologies such as network coding, software-based radio, dirty RF, etc. and their relation to cognitive radio. The second section ...

  6. On the Deep Integration of Radio and TV University Education and Information Technology and the Institutional Innovation%电大教育与信息技术的深度融合和体制创新

    Institute of Scientific and Technical Information of China (English)

    张新昌

    2012-01-01

    广播电视大学是一所从事现代远程教育的学校,具有教育、开放、远程三个方面的本质属性。在信息社会,为了满足个性化、多样化、终身化的学习需求,实现教育效率和质量的统一,与信息技术深度融合是电大教育改革和发展的必然要求和趋势。融合过程必然伴随教学模式和教育体制的创新、内涵的提升,只有当教育信息化突破技术的界限,真正成为一种教学、管理和服务的理念和方法,电大教育才能实现符合远程教育规律的科学发展。%Radio and TV University is a modern distance education school which has the nature of the three aspects as education,opening and distance.In the information society,in order to meet the needs of personalized,diverse,lifelong learning,to achieve the unification of educational efficiency and quality,and the depth of integration with the information technology is required by the reform development and trends of RTVU education.The integration process must be accompanied by a teaching mode and educational system innovation,upgrading of the connotation.Only when the educational information breaks through the boundaries of technology and truly becomes a kind of concept and method of teaching,management and service,can RTVU education be achieved in line with the scientific laws of distance education development.

  7. Music, Radio, and Mediatization

    DEFF Research Database (Denmark)

    Krogh, Mads; Michelsen, Morten

    2016-01-01

    Mediatization has become a key concept for understanding the relations between media and other cultural and social fields. Contributing to the discussions related to the concept of mediatization, this article discusses how practices of radio and music(al life) influence each other. We follow Deacon......’s and Stanyer’s advice to supplement the concept of mediatization with ‘a series of additional concepts at lower levels of abstraction’ and suggest, in this respect, the notion of heterogeneous milieus of music– radio. Hereby, we turn away from the all-encompassing perspectives related to the concept...... of mediatization where media as such seem to be ascribed agency. Instead, we consider historical accounts of music–radio in order to address the complex non- linearity of concrete processes of mediatization as they take place in the multiple meetings between a decentred notion of radio and musical life....

  8. Unveiling the radio cosmos

    Science.gov (United States)

    Vanderlinde, Keith

    2017-02-01

    Using a radio telescope with no moving parts, the dark energy speeding up the expansion of the Universe can be probed in unprecedented detail, says Keith Vanderlinde, on behalf of the CHIME collaboration.

  9. Everyday Radio Telescope

    CERN Document Server

    Mandal, Pranshu; Kumar, Pratik; Yelikar, Anjali; Soni, Kanchan; T, Vineeth Krishna

    2016-01-01

    We have developed an affordable, portable college level radio telescope for amateur radio astronomy which can be used to provide hands-on experience with the fundamentals of a radio telescope and an insight into the realm of radio astronomy. With our set-up one can measure brightness temperature and flux of the Sun at 11.2 GHz and calculate the beam width of the antenna. The set-up uses commercially available satellite television receiving system and parabolic dish antenna. We report the detection of point sources like Saturn and extended sources like the galactic arm of the Milky way. We have also developed python pipeline, which are available for free download, for data acquisition and visualization.

  10. Social cognitive radio networks

    CERN Document Server

    Chen, Xu

    2015-01-01

    This brief presents research results on social cognitive radio networks, a transformational and innovative networking paradigm that promotes the nexus between social interactions and cognitive radio networks. Along with a review of the research literature, the text examines the key motivation and challenges of social cognitive radio network design. Three socially inspired distributed spectrum sharing mechanisms are introduced: adaptive channel recommendation mechanism, imitation-based social spectrum sharing mechanism, and evolutionarily stable spectrum access mechanism. The brief concludes with a discussion of future research directions which ascertains that exploiting social interactions for distributed spectrum sharing will advance the state-of-the-art of cognitive radio network design, spur a new line of thinking for future wireless networks, and enable novel wireless service and applications.

  11. Smart Radio Spectrum Management for Cognitive Radio

    Directory of Open Access Journals (Sweden)

    Partha Pratim Bhattacharya

    2011-08-01

    Full Text Available Today’s wireless networks are characterized by fixed spectrum assignment policy. The limited availablespectrum and the inefficiency in the spectrum usage necessitate a new communication paradigm toexploit the existing wireless spectrum opportunistically. Cognitive radio is a paradigm for wirelesscommunication in which either a network or a wireless node changes its transmission or receptionparameters to communicate efficiently avoiding interference with licensed or unlicensed users. It cancapture best available spectrum to meet user communication requirements (spectrum management. Inthis work, a fuzzy logic based system for spectrum management is proposed where the radio can shareunused spectrum depending on parameters like distance, signal strength, node velocity and availabilityof unused spectrum. The system is simulated and is found to give satisfactory results.

  12. Wireless radio a history

    CERN Document Server

    Coe, Lewis

    2006-01-01

    ""Informative...recommended""--Choice; ""interesting...a good read...well worth reading""--Contact Magazine. This history first looks at Marconi's wireless communications system and then explores its many applications, including marine radio, cellular telephones, police and military uses, television and radar. Radio collecting is also discussed, and brief biographies are provided for the major figures in the development and use of the wireless.

  13. The Call of Humanity in The Call of the Wild

    Institute of Scientific and Technical Information of China (English)

    朱露; 张磊

    2011-01-01

    Jack London is one of the greatest American novelists. Many of his works are very popular among readers all over the world. This paper firstly gives a brief introduction of Jack London and The Call of the Wild. Then it analyzes the theme and main Characters of this novel. At last the implied meaning is discussed.

  14. Classics in radio astronomy

    CERN Document Server

    Sullivan, Woodruff Turner

    1982-01-01

    Radio techniques were the nrst to lead astronomy away from the quiescent and limited Universe revealed by traditional observations at optical wave­ lengths. In the earliest days of radio astronomy, a handful of radio physicists and engineers made one startling discovery after another as they opened up the radio sky. With this collection of classic papers and the extensive intro­ ductory material, the reader can experience these exciting discoveries, as well as understand the developing techniques and follow the motivations which prompted the various lines of inquiry. For instance he or she will follow in detail the several attempts to detect radio waves from the sun at the turn of the century; the unravelling by Jansky of a "steady hiss type static"; the incredible story of Reber who built a 9 meter dish in his backyard in 1937 and then mapped the Milky Way; the vital discoveries by Hey and colleagues of radio bursts from the Sun and of a discrete source in the constellation of Cygnus; the development of re...

  15. Intelligent Wireless Communication System Using Cognitive Radio

    Directory of Open Access Journals (Sweden)

    Asma Amraoui

    2012-04-01

    Full Text Available The increasing demand for wireless communication introduces efficient spectrum utilization challenge. To address this challenge, cognitive radio (CR is emerged as the key technology; which enables opportunistic access to the spectrum. CR is a form of wireless communication in which a transceiver can intelligently detect which communication channels are in use and which are not, and instantly move into vacant channels while avoiding occupied ones. This optimizes the use of available radio-frequency (RFspectrum while minimizing interference to other users. In this paper, we present a state of the art onthe use of Multi Agent Systems (MAS for spectrum access using cooperation and competition to solve the problem of spectrum allocation and ensure better management. Then we propose a new approach which uses the CR for improving wireless communication for a single cognitive radio mobile terminal (CRMT.

  16. The Wireless Nursing Call System

    DEFF Research Database (Denmark)

    Jensen, Casper Bruun

    2006-01-01

    This paper discusses a research project in which social scientists were involved both as analysts and supporters during a pilot with a new wireless nursing call system. The case thus exemplifies an attempt to participate in developing dependable health care systems and offers insight into the cha......This paper discusses a research project in which social scientists were involved both as analysts and supporters during a pilot with a new wireless nursing call system. The case thus exemplifies an attempt to participate in developing dependable health care systems and offers insight...

  17. Radio and the educational needs of Africa.

    Science.gov (United States)

    Quarmyne, A T

    1985-01-01

    of approach which works. A major feature common to all successful projects is the use of specialists, who employed sound educational and communication research techniques for the design of projects, for the development of the programs, and for the assessment of their effectiveness. Radio is proposed as the optimum medium or technology to realize the dual goals of educational democratization and renovation in Africa, but educational radio in Africa in its present form is not ready to accept this challenge. 2 fundamental reasons for the failures are: the human factor -- the educator will not give an inch from his/her arena of classroom teaching to facilitate wider learning and the broadcaster will not share the mystique of the craft to put it to substantive use; and democratization of radio itself is required.

  18. Monitoring System for Atmospheric Water Vapor with a Ground-Based Multi-Band Radiometer: Meteorological Application of Radio Astronomy Technologies

    Science.gov (United States)

    Nagasaki, T.; Araki, K.; Ishimoto, H.; Kominami, K.; Tajima, O.

    2016-08-01

    High-resolution estimation of thermodynamic properties in the atmosphere can help to predict and mitigate meteorological disasters, such as local heavy rainfall and tornadic storms. For the purposes of short-term forecasting and nowcasting of severe storms, we propose a novel ground-based measurement system, which observes the intensity of atmospheric radiation in the microwave range. Our multi-band receiver system is designed to identify a rapid increase in water vapor before clouds are generated. At frequencies between 20 and 30 GHz, our system simultaneously measures water vapor as a broad absorption peak at 22 GHz as well as cloud liquid water. Another band at 50-60 GHz provides supplementary information from oxygen radiation to give vertical profiles of physical temperature. For the construction of this cold receiver system, novel technologies originally developed for observations of cosmic microwave background radiation were applied. The input atmospheric signal is amplified by a cold low-noise amplifier maintained below 10 K, while the spectrum of this amplified signal is measured using a signal analyzer under ambient conditions. The cryostat also contains a cold black body at 40 K to act as a calibration signal. This calibration signal is transported to each of the receivers via a wire grid. We can select either the atmospheric signal or the calibration signal by changing the orientation of this wire. Each receiver can be calibrated using this setup. Our system is designed to be compact (<1 m3), with low power consumption (˜ 1.5 kW). Therefore, it is easy to deploy on top of high buildings, mountains, and ship decks.

  19. Learning as Calling and Responding

    Science.gov (United States)

    Jons, Lotta

    2014-01-01

    According to Martin Buber's philosophy of dialogue, our being-in-the-world is to be conceived of as an existential dialogue. Elsewhere, I have conceptualized the teacher-student-relation accordingly (see Jons 2008), as a matter of calling and responding. The conceptualization rests on a secularised notion of vocation, paving way for…

  20. An Evaluation Framework for CALL

    Science.gov (United States)

    McMurry, Benjamin L.; Williams, David Dwayne; Rich, Peter J.; Hartshorn, K. James

    2016-01-01

    Searching prestigious Computer-assisted Language Learning (CALL) journals for references to key publications and authors in the field of evaluation yields a short list. The "American Journal of Evaluation"--the flagship journal of the American Evaluation Association--is only cited once in both the "CALICO Journal and Language…

  1. 基于射频技术的野战物资管理系统设计与应用%Design and application of field material management system based on radio frequency technology

    Institute of Scientific and Technical Information of China (English)

    崔维斌; 吴天顺; 郭平彩; 马红京; 金晓芳

    2015-01-01

    目的:设计一种能够满足野战储备物资保障需要的野战物资管理系统,利用射频识别(RFID)技术建立能快速、准确、高效和智能的野战物资出入库管理平台。方法:采用RFID、局域无线网覆盖等计算机技术对野战仓库物资管理的全过程进行自动化数据采集,通过科学编码对物品的批次、保质期等进行科学管理。结果:智能化新技术在野战仓库管理中的研究和应用,快速实现了“三分四定”分组管理的要求。保证野战仓库管理各个环节数据输入的速度和准确性,确保及时准确地掌握库存真实数据,合理控制野战库存。结论:RFID技术的应用实现了野战物资快速化、自动化和智能化管理,提高了部队的后勤保障能力。%Objective:A material management system is design to meet the needs of field reserve materials security. An out of storage management platform in field supplies can be established by radio frequency identification (RFID) technology which is rapid, accurate, efficient, capable of intelligent. Methods:RFID, local area wireless network coverage and other computer technology are used on automated data acquisition during the whole process of material management. It ensures scientific management through scientific coding of goods by batch shelf of life in field warehouse. Results: Research and application of new intelligent technology in warehouse management system may help to achieve rapid implementation of grouping management requirements. It also ensure the speed and accuracy of data input in all aspects of warehouse management, so that the real inventory data may be mastered on time and accurately, and a reasonable field inventory be controlled. Conclusion: The field material management become quick, automatic and intelligent by using RFID. It can improve the logistics support ability of the army.

  2. Interference measurements on amplitude compandored single sideband (ACSB) land mobil radio

    Science.gov (United States)

    Wootton, H.

    1983-06-01

    The National Telecommunications and Information Administration (NTIA) funded the ECAC to conduct adjacent-signal interference tests on a new radio system technology that shows promise of allowing smaller channel spacing in the Government land mobile radio band (162-174 MHz). The system tested was an amplitude compandored single-sideband radio (ACSB) manufactured by Sideband Technology, Inc. This report presents the adjacent-signal interference (ASI) result which will be employed by NTIA in evaluation of the potential usage of the ACSB technology in the Government land mobile radio band.

  3. Technology.

    Science.gov (United States)

    Online-Offline, 1998

    1998-01-01

    Focuses on technology, on advances in such areas as aeronautics, electronics, physics, the space sciences, as well as computers and the attendant progress in medicine, robotics, and artificial intelligence. Describes educational resources for elementary and middle school students, including Web sites, CD-ROMs and software, videotapes, books,…

  4. Investigation on the application of radio frequency identification technology in the pasteurization of surgical devices%无线射频识别技术在手术灭菌器械管理中的应用研究

    Institute of Scientific and Technical Information of China (English)

    马俊; 汤维娟; 侯斌

    2014-01-01

    目的:调查无线射频识别( RFID)技术在我院使用的现状,为进一步推广使用提供依据。方法选取2013年6月本院消毒供应中心、手术室及病房262名工作人员,采取自制问卷进行调查,问卷Cronbach′s α系数为0.824。结果 RFID技术使用最多的为消毒供应中心及手术室。66.96%的使用者认为RFID“操作简便”,80.18%认为“使器械管理更规范”,80.36%认为RFID“能确保每个环节质量”,75.9%认为RFID技术的“器械包追溯功能”给临床带来的帮助最大,71.4%认为RFID技术优于传统器械管理在于“信息核对准确”。另外,RFID技术还需要在速度、信息上传点、标签管理等方面进行改进。结论 RFID技术能增加规范化管理,提升工作效率,保证工作质量,在临床使用取得良好的效果。%Objective To investigate the application of radio frequency identification ( RFID) in clinical practice in our hos-pital, so as to provide evidence for further extension of FRID technology.Methods Two hundred and sixty-two nurses from the central pasteurization and supply center ( CSSC) , the surgical suites and wards of the hospital in June 2013 were surveyed by a questionnaire developed by ourselves.The Cronbach′s αof the questionnaire was 0.824.Results FRID technology was used most frequently in the central pasteurization and supply center and surgical suites.66.96%of the people thought RFID was easy to operate, 80.18%of them held that it made surgical management more standard, and 80.36%agreed that the FRID technology could ensure the quality of all the links in the work.75.9%of the people surveyed had the opinion that the tracing function of the surgical kit inherent in the FRID tech-nology was most helpful to clinical work.And 71.4% of the people thought the superiority of RFID over conventional surgical device management lied in the accuracy of information check.However, further

  5. Linking CALL and SLA: Using the IRIS Database to Locate Research Instruments

    Science.gov (United States)

    Handley, Zöe; Marsden, Emma

    2014-01-01

    To establish an evidence base for future computer-assisted language learning (CALL) design, CALL research needs to move away from CALL versus non-CALL comparisons, and focus on investigating the differential impact of individual coding elements, that is, specific features of a technology which might have an impact on learning (Pederson, 1987).…

  6. Radio Frequency Microelectromechanical Systems in Defence and Aerospace

    Directory of Open Access Journals (Sweden)

    D.V.K. Sastry

    2009-11-01

    Full Text Available For all onboard systems applications, it is important to have very low-loss characteristics and low power consumption coupled with size reduction. The controls and instrumentation in defence and aerospace continually calls for newer technologies and developments. One such technology showing remarkable potential over the years is radio frequency microelectromechanical systems (RF MEMS which have already made their presence felt prominently by offering replacement in radar and communication systems with high quality factors and precise tunability. The RF MEMS components have emerged as potential candidates for defence and aerospace applications. The core theme of this paper is to drive home the fact that the limitations faced by the current RF devices can be overcome by the flexibility and better device performance characteristics of RF MEMS components, which ultimately propagate the device level benefits to the final system to attain the unprecedented levels of performance.Defence Science Journal, 2009, 59(6, pp.568-567, DOI:http://dx.doi.org/10.14429/dsj.59.1561

  7. 射频超声技术定量评估陕西地区正常儿童颈部动脉的研究%Radio frequency ultrasound technology to quantitatively assess of normal children In Shaanxi

    Institute of Scientific and Technical Information of China (English)

    李安茂; 冯晓蕾; 刘婷; 张婕; 白强; 李华; 陈广生

    2013-01-01

    【Objective】 To quantitative evaluat the normal children carotid artery intima-media thickness(IMT) and wall elastic various parameters of the salary range,and provide normal reference data for atherosclerosis early diagnosis and childhood intervention in Shaanxi. 【Methods】The quality intima-media thickness (QIMT)and quality arterial stiffness (QAS)of ultrasound radio frequency(RF) technology were applied for 150 normal children volunteer to obtain bilateral carotid intima-media thickness IMT,compliance index (distend compliance DC.conform compliance CC) and stiffness index (augmentation index AIX, a coefficient, βcoefficient, pulse wave velocity PWV) , parameters childhood range. 【Results】 1) Normal children aged 7 ~ 15 in Shaanxi had IMTC441. 483±85. 126)ntn,DC(0. 077±0. 030)mm2/kPa,CC(2. 290 ± 0. 952) mm2/kPa,AIX(-2. 804±2. 449),α(l. 453 + 0. 519),β(3. 002±l. 050),PWV(3. 650±0. 558) m/s. 2)Carotid artery between the right and left sides,between the different gender carotid parameters showed no significant differences. 【Conclusion】Application of radio frequency ultrasound technology can accurately provide normal childhood common carotid artery intima-media thickness IMT,vascular elastic parameter,and scientific basis for intervention in the prevention of arteriosclerosis in Shaanxi area.%[目的]定量评估陕西地区正常儿童双侧颈部动脉内中膜厚度及管壁弹性各项参数的大致范围,为动脉粥样硬化早期诊断和儿童期干预提供正常参考数据. [方法]对150例正常儿童志愿者应用超声射频信号血管内中膜分析技术QIMT及超声射频信号动脉僵硬度分析技术QAS获取双侧颈动脉的内中膜厚度(IMT)、顺应性指标(膨胀系数DC、顺应系数CC)及僵硬度指标(反射波增强指数AIX、a系数、β系数、脉搏波传导速度PWV),确定各项参数儿童期的大致范围. [结果]1)陕西地区7~15岁正常儿童IMT(441.483±85.126)μm,DC(0.077±0.030) mm2/k

  8. Radio data archiving system

    Science.gov (United States)

    Knapic, C.; Zanichelli, A.; Dovgan, E.; Nanni, M.; Stagni, M.; Righini, S.; Sponza, M.; Bedosti, F.; Orlati, A.; Smareglia, R.

    2016-07-01

    Radio Astronomical Data models are becoming very complex since the huge possible range of instrumental configurations available with the modern Radio Telescopes. What in the past was the last frontiers of data formats in terms of efficiency and flexibility is now evolving with new strategies and methodologies enabling the persistence of a very complex, hierarchical and multi-purpose information. Such an evolution of data models and data formats require new data archiving techniques in order to guarantee data preservation following the directives of Open Archival Information System and the International Virtual Observatory Alliance for data sharing and publication. Currently, various formats (FITS, MBFITS, VLBI's XML description files and ancillary files) of data acquired with the Medicina and Noto Radio Telescopes can be stored and handled by a common Radio Archive, that is planned to be released to the (inter)national community by the end of 2016. This state-of-the-art archiving system for radio astronomical data aims at delegating as much as possible to the software setting how and where the descriptors (metadata) are saved, while the users perform user-friendly queries translated by the web interface into complex interrogations on the database to retrieve data. In such a way, the Archive is ready to be Virtual Observatory compliant and as much as possible user-friendly.

  9. Software Defined Radios - Architectures, Systems and Functions

    Science.gov (United States)

    Sims, Herb

    2017-01-01

    Software Defined Radio is an industry term describing a method of utilizing a minimum amount of Radio Frequency (RF)/analog electronics before digitization takes place. Upon digitization all other functions are performed in software/firmware. There are as many different types of SDRs as there are data systems. Software Defined Radio (SDR) technology has been proven in the commercial sector since the early 90's. Today's rapid advancement in mobile telephone reliability and power management capabilities exemplifies the effectiveness of the SDR technology for the modern communications market. In contrast the foundations of transponder technology presently qualified for satellite applications were developed during the early space program of the 1960's. SDR technology offers potential to revolutionize satellite transponder technology by increasing science data through-put capability by at least an order of magnitude. While the SDR is adaptive in nature and is "One-size-fits-all" by design, conventional transponders are built to a specific platform and must be redesigned for every new bus. The SDR uses a minimum amount of analog/Radio Frequency components to up/down-convert the RF signal to/from a digital format. Once analog data is digitized, all processing is performed using hardware logic. Typical SDR processes include; filtering, modulation, up/down converting and demodulation. This presentation will show how the emerging SDR market has leveraged the existing commercial sector to provide a path to a radiation tolerant SDR transponder. These innovations will reduce the cost of transceivers, a decrease in power requirements and a commensurate reduction in volume. A second pay-off is the increased flexibility of the SDR by allowing the same hardware to implement multiple transponder types by altering hardware logic - no change of analog hardware is required - all of which can be ultimately accomplished in orbit. This in turn would provide high capability and low cost

  10. The MeqTrees software system and its use for third-generation calibration of radio interferometers

    Science.gov (United States)

    Noordam, J. E.; Smirnov, O. M.

    2010-12-01

    Context. The formulation of the radio interferometer measurement equation (RIME) for a generic radio telescope by Hamaker et al. has provided us with an elegant mathematical apparatus for better understanding, simulation and calibration of existing and future instruments. The calibration of the new radio telescopes (LOFAR, SKA) would be unthinkable without the RIME formalism, and new software to exploit it. Aims: The MeqTrees software system is designed to implement numerical models, and to solve for arbitrary subsets of their parameters. It may be applied to many problems, but was originally geared towards implementing Measurement Equations in radio astronomy for the purposes of simulation and calibration. The technical goal of MeqTrees is to provide a tool for rapid implementation of such models, while offering performance comparable to hand-written code. We are also pursuing the wider goal of increasing the rate of evolution of radio astronomical software, by offering a tool that facilitates rapid experimentation, and exchange of ideas (and scripts). Methods: MeqTrees is implemented as a Python-based front-end called the meqbrowser, and an efficient (C++-based) computational back-end called the meqserver. Numerical models are defined on the front-end via a Python-based Tree Definition Language (TDL), then rapidly executed on the back-end. The use of TDL facilitates an extremely short turn-around time (hours rather than weeks or months) for experimentation with new ideas. This is also helped by unprecedented visualization capabilities for all final and intermediate results. A flexible data model and a number of important optimizations in the back-end ensures that the numerical performance is comparable to that of hand-written code. Results: MeqTrees is already widely used as the simulation tool for new instruments (LOFAR, SKA) and technologies (focal plane arrays). It has demonstrated that it can achieve a noise-limited dynamic range in excess of a million, on

  11. Astronomers Detect Powerful Bursting Radio Source Discovery Points to New Class of Astronomical Objects

    Science.gov (United States)

    2005-03-01

    transients has been very exciting for our students,” Hyman added. Participating in this research program has inspired at least two of Hyman?s students — Jennifer Neureuther and Mariana Lazarova — to pursue graduate studies in astronomy. This project was supported at Sweet Briar College by funding from Research Corporation and the Jeffress Foundation. Basic research in radio astronomy at NRL is supported by the Office of Naval Research. Further Research Hyman and his NRL colleagues plan to continue monitoring the Galactic center and search for the source again with the VLA and other X-ray and radio telescopes. They are also developing (with Dr. Kent Wood of NRL) a model that attempts to account for the radio bursts as a new type of outburst from a class of sources known as “magnetars.” NRL is also contributing to an effort to build the world’s largest and most sensitive low-frequency telescope, called the Long Wavelength Array (LWA), which may revolutionize future searches for other radio transient sources. Current plans call for the LWA, which is being developed by the University of New Mexico-led Southwest Consortium, to be sited in New Mexico, not far from the VLA. “One of the key advantages of observing at long radio wavelengths,” explained NRL astronomer, Dr. Namir Kassim, “is that the field-of-view is so large that a single observation can efficiently detect transient phenomena over a large region.” “When completed, the LWA may uncover hundreds of previously unknown radio transients, some of which may be examples of Jupiter-like planets orbiting other stars,” Kassim added. Jupiter is the most famous example of a nearby radio transient. About Sweet Briar College Sweet Briar College is consistently ranked among the nation’s top liberal arts colleges.ÿ Founded in 1901 as an independent undergraduate college for women, Sweet Briar continues its commitment to the education of women, offering a full range of liberal arts majors, including subjects

  12. Calle y Saberes en Movimiento

    Directory of Open Access Journals (Sweden)

    Laura Daniela Aguirre Aguilar

    2010-01-01

    Full Text Available En México el rezago, el ausentismo, la deserción escolar, el trabajo a temprana edad y el inicio de una vida en la calle, en repetidas ocasiones son consecuencia de un núcleo familiar desarticulado o de una débil relación intrafamiliar, así como de una condición socioeconómica en desventaja. Ante esta problemática, la Secretaría de Educación Pública, instancia gubernamental encargada de garantizar una educación de calidad para la población, trabaja coordinadamente con organizaciones de la sociedad civil e instancias públicas, para la reintegración a los espacios educativos de los niños, niñas y jóvenes en situación de calle.

  13. Call for improving air quality

    Science.gov (United States)

    Showstack, Randy

    2013-01-01

    The European Environmental Bureau (EEB), a federation of citizen organizations, has called for stricter policies in Europe to protect human health and the environment. "Air pollution emanates from sources all around us, be they cars, industrial plants, shipping, agriculture, or waste. The [European Union] must propose ambitious legislation to address all of these sources if it is to tackle the grave public health consequences of air pollution," EEB secretary general Jeremy Wates said on 8 January.

  14. Ultrasound call detection in capybara

    Directory of Open Access Journals (Sweden)

    Selene S.C. Nogueira

    2012-07-01

    Full Text Available The vocal repertoire of some animal species has been considered a non-invasive tool to predict distress reactivity. In rats ultrasound emissions were reported as distress indicator. Capybaras[ vocal repertoire was reported recently and seems to have ultrasound calls, but this has not yet been confirmed. Thus, in order to check if a poor state of welfare was linked to ultrasound calls in the capybara vocal repertoire, the aim of this study was to track the presence of ultrasound emissions in 11 animals under three conditions: 1 unrestrained; 2 intermediately restrained, and 3 highly restrained. The ultrasound track identified frequencies in the range of 31.8±3.5 kHz in adults and 33.2±8.5 kHz in juveniles. These ultrasound frequencies occurred only when animals were highly restrained, physically restrained or injured during handling. We concluded that these calls with ultrasound components are related to pain and restraint because they did not occur when animals were free of restraint. Thus we suggest that this vocalization may be used as an additional tool to assess capybaras[ welfare.

  15. Radio Numbers of Certain m-Distant Trees

    Directory of Open Access Journals (Sweden)

    Srinivasa Rao Kola

    2014-01-01

    Full Text Available Radio coloring of a graph G with diameter d is an assignment f of positive integers to the vertices of G such that |f(u-f(v|≥1+d-d(u,v, where u and v are any two distinct vertices of G and d(u,v is the distance between u and v. The number max {f(u:u∈V(G} is called the span of f. The minimum of spans over all radio colorings of G is called radio number of G, denoted by rn(G. An m-distant tree T is a tree in which there is a path P of maximum length such that every vertex in V(T∖V(P is at the most distance m from P. This path P is called a central path. For every tree T, there is an integer m such that T is a m-distant tree. In this paper, we determine the radio number of some m-distant trees for any positive integer m≥2, and as a consequence of it, we find the radio number of a class of 1-distant trees (or caterpillars.

  16. ANTENNA OF RADIO CONTROL

    Directory of Open Access Journals (Sweden)

    Ludwig Ilnytskyi

    2015-12-01

    Full Text Available The article is devoted to current issues in the field of radio monitoring. In this article was considered the antenna of radio control, which represents a grid from three vibrators. Threelement antenna array provides simultaneous control of two radio electronic devices that radiates at frequencies that are close to each other. Antenna system using simple technical means provides noise suppression, even if noise will have the same frequency as useful signal. This makes it possible to use the antenna system in conditions of multibeam wave propagation under the adjustment on the most intense by the power beam. Antenna system makes it possible to measure the electromagnetic field intensity, congestion of the frequency spectrum, direction of noise electromagnetic waves incidence, noise electric field intensity.

  17. Comets at radio wavelengths

    CERN Document Server

    Crovisier, Jacques; Colom, Pierre; Biver, Nicolas

    2016-01-01

    Comets are considered as the most primitive objects in the Solar System. Their composition provides information on the composition of the primitive solar nebula, 4.6 Gyr ago. The radio domain is a privileged tool to study the composition of cometary ices. Observations of the OH radical at 18 cm wavelength allow us to measure the water production rate. A wealth of molecules (and some of their isotopologues) coming from the sublimation of ices in the nucleus have been identified by observations in the millimetre and submillimetre domains. We present an historical review on radio observations of comets, focusing on the results from our group, and including recent observations with the Nan\\c{c}ay radio telescope, the IRAM antennas, the Odin satellite, the Herschel space observatory, ALMA, and the MIRO instrument aboard the Rosetta space probe.

  18. Mobile radio channels

    CERN Document Server

    Pätzold, Matthias

    2011-01-01

    Providing a comprehensive overview of the modelling, analysis and simulation of mobile radio channels, this book gives a detailed understanding of fundamental issues and examines state-of-the-art techniques in mobile radio channel modelling. It analyses several mobile fading channels, including terrestrial and satellite flat-fading channels, various types of wideband channels and advanced MIMO channels, providing a fundamental understanding of the issues currently being investigated in the field. Important classes of narrowband, wideband, and space-time wireless channels are explored in deta

  19. Saber sobre la radio

    OpenAIRE

    Mata, María Cristina; Universidad Nacional de Córdoba. Argentina

    1998-01-01

    La autora propone en este artículo repensar los fundamentos sobre los cuales se estructuran las asignaturas y talleres de radio en las escuelas de Comunicación Social en Latinoamérica, con el proposito de romper la escisión  entre teoría/práctica y de no violentar su complejidad: en la radio, entendida como práctica comunicativa, se juega en primer lugar una "red de vinculaciones e intercambios" en condiciones privilegiadas para la dialoguicidad. En un segundo lugar, asociado al desarrollo de...

  20. Bayesian Inference for Radio Observations - Going beyond deconvolution

    CERN Document Server

    Lochner, Michelle; Kunz, Martin; Natarajan, Iniyan; Oozeer, Nadeem; Smirnov, Oleg; Zwart, Jon

    2015-01-01

    Radio interferometers suffer from the problem of missing information in their data, due to the gaps between the antennas. This results in artifacts, such as bright rings around sources, in the images obtained. Multiple deconvolution algorithms have been proposed to solve this problem and produce cleaner radio images. However, these algorithms are unable to correctly estimate uncertainties in derived scientific parameters or to always include the effects of instrumental errors. We propose an alternative technique called Bayesian Inference for Radio Observations (BIRO) which uses a Bayesian statistical framework to determine the scientific parameters and instrumental errors simultaneously directly from the raw data, without making an image. We use a simple simulation of Westerbork Synthesis Radio Telescope data including pointing errors and beam parameters as instrumental effects, to demonstrate the use of BIRO.

  1. High Dynamic Range Cognitive Radio Front Ends: Architecture to Evaluation

    Science.gov (United States)

    Ashok, Arun; Subbiah, Iyappan; Varga, Gabor; Schrey, Moritz; Heinen, Stefan

    2016-07-01

    Advent of TV white space digitization has released frequencies from 470 MHz to 790 MHz to be utilized opportunistically. The secondary user can utilize these so called TV spaces in the absence of primary users. The most important challenge for this coexistence is mutual interference. While the strong TV stations can completely saturate the receiver of the cognitive radio (CR), the cognitive radio spurious tones can disturb other primary users and white space devices. The aim of this paper is to address the challenges for enabling cognitive radio applications in WLAN and LTE. In this process, architectural considerations for the design of cognitive radio front ends are discussed. With high-IF converters, faster and flexible implementation of CR enabled WLAN and LTE are shown. The effectiveness of the architecture is shown by evaluating the CR front ends for compliance of standards namely 802.11b/g (WLAN) and 3GPP TS 36.101 (LTE).

  2. Technology

    Directory of Open Access Journals (Sweden)

    Xu Jing

    2016-01-01

    Full Text Available The traditional answer card reading method using OMR (Optical Mark Reader, most commonly, OMR special card special use, less versatile, high cost, aiming at the existing problems proposed a method based on pattern recognition of the answer card identification method. Using the method based on Line Segment Detector to detect the tilt of the image, the existence of tilt image rotation correction, and eventually achieve positioning and detection of answers to the answer sheet .Pattern recognition technology for automatic reading, high accuracy, detect faster

  3. e-POP Radio Science Using Amateur Radio Transmissions

    Science.gov (United States)

    Frissell, N. A.; Perry, G. W.; Miller, E. S.; Shovkoplyas, A.; Moses, M. L.; James, H. G.; Yau, A. W.

    2015-12-01

    A major component of the enhanced Polar Outflow Probe (e-POP) Radio Receiver Instrument (RRI) mission is to utilize artificially generated radio emissions to study High Frequency (HF) radio wave propagation in the ionosphere. In the North American and European sectors, communications between amateur radio operators are a persistent and abundant source source of HF transmissions. We present the results of HF radio wave propagation experiments using amateur radio transmissions as an HF source for e-POP RRI. We detail how a distributed and autonomously operated amateur radio network can be leveraged to study HF radio wave propagation as well as the structuring and dynamics of the ionosphere over a large geographic region. In one case, the sudden disappearance of nearly two-dozen amateur radio HF sources located in the midwestern United States was used to detect a enhancement in foF2 in that same region. We compare our results to those from other more conventional radio instruments and models of the ionosphere to demonstrate the scientific merit of incorporating amateur radio networks for radio science at HF.

  4. Spectrum management and radio resource management considering cognitive radio systems

    NARCIS (Netherlands)

    Haartsen, Jaap C.; Wieweg, Lasse; Huschke, Jörg

    2005-01-01

    International fora and some national administrations define a cognitive radio (CR) as a pioneering radio communication system that would be capable of altering and adapting its transmitter and receiver parameters based on communication and the exchange of information with related detectable radio co

  5. Radio Fatwa : Islamic Tanya-Jawab Programmes on Radio Dakwah

    NARCIS (Netherlands)

    Sunarwoto,

    2012-01-01

    The present article is a study of radio fatwa in Indonesia with special reference to the Tanya-Jawab genres in radio dakwah.The concept of fatwa has changed over time. Such Islamic Tanya-Jawab programmes broadcast on radio dakwah are important to understand how fatwa is disseminated by means of medi

  6. Imprints of Molecular Clouds in Radio Continuum Images

    CERN Document Server

    Yusef-Zadeh, F

    2012-01-01

    We show radio continuum images of several molecular complexes in the inner Galaxy and report the presence of dark features that coincide with dense molecular clouds. Unlike infrared dark clouds, these features which we call "radio dark clouds" are produced by a deficiency in radio continuum emission from molecular clouds that are embedded in a bath of UV radiation field or synchrotron emitting cosmic ray particles. The contribution of the continuum emission along different pathlengths results in dark features that trace embedded molecular clouds. The new technique of identifying cold clouds can place constraints on the depth and the magnetic field of molecular clouds when compared to those of the surrounding hot plasma radiating at radio wavelengths. The study of five molecular complexes in the inner Galaxy, Sgr A, Sgr B2, radio Arc, the snake filament and G359.75-0.13 demonstrate an anti--correlation between the distributions of radio continuum and molecular line and dust emission. Radio dark clouds are iden...

  7. ON THE ORIGIN OF RADIO EMISSION FROM MAGNETARS

    Energy Technology Data Exchange (ETDEWEB)

    Szary, Andrzej; Melikidze, George I.; Gil, Janusz, E-mail: aszary@astro.ia.uz.zgora.pl [Kepler Institute of Astronomy, University of Zielona Góra, Lubuska 2, 65-265 Zielona Góra (Poland)

    2015-02-10

    Magnetars are the most magnetized objects in the known universe. Powered by the magnetic energy, and not by the rotational energy as in the case of radio pulsars, they have long been regarded as a completely different class of neutron stars. The discovery of pulsed radio emission from a few magnetars weakened the idea of a clean separation between magnetars and normal pulsars. We use the partially screened gap (PSG) model to explain radio emission of magnetars. The PSG model requires that the temperature of the polar cap is equal to the so-called critical value, i.e., the temperature at which the thermal ions outflowing from the stellar surface screen the acceleration gap. We show that a magnetar has to fulfill the temperature, power, and visibility conditions in order to emit radio waves. First, in order to form PSG, the residual temperature of the surface has to be lower than the critical value. Second, since the radio emission is powered by the rotational energy, it has to be high enough to enable heating of the polar cap by backstreaming particles to the critical temperature. Finally, the structure of the magnetic field has to be altered by magnetospheric currents in order to widen a radio beam and increase the probability of detection. Our approach allows us to predict whether a magnetar can emit radio waves using only its rotational period, period derivative, and surface temperature in the quiescent mode.

  8. Smart radio: spectrum access for first responders

    Science.gov (United States)

    Silvius, Mark D.; Ge, Feng; Young, Alex; MacKenzie, Allen B.; Bostian, Charles W.

    2008-04-01

    This paper details the Wireless at Virginia Tech Center for Wireless Telecommunications' (CWT) design and implementation of its Smart Radio (SR) communication platform. The CWT SR can identify available spectrum within a pre-defined band, rendezvous with an intended receiver, and transmit voice and data using a selected quality of service (QoS). This system builds upon previous cognitive technologies developed by CWT for the public safety community, with the goal of providing a prototype mobile communications package for military and public safety First Responders. A master control (MC) enables spectrum awareness by characterizing the radio environment with a power spectrum sensor and an innovative signal detection and classification module. The MC also enables spectrum and signal memory by storing sensor results in a knowledge database. By utilizing a family radio service (FRS) waveform database, the CWT SR can create a new communication link on any designated FRS channel frequency using FM, BPSK, QPSK, or 8PSK modulations. With FM, it supports analog voice communications with legacy hand-held FRS radios. With digital modulations, it supports IP data services, including a CWT developed CVSD-based VoIP protocol. The CWT SR coordinates spectrum sharing between analog primary users and digital secondary users by applying a simple but effective channel-change protocol. It also demonstrates a novel rendezvous protocol to facilitate the detection and initialization of communications links with neighboring SR nodes through the transmission of frequency-hopped rendezvous beacons. By leveraging the GNU Radio toolkit, writing key modules entirely in Python, and utilizing the USRP hardware front-end, the CWT SR provides a dynamic spectrum test bed for future smart and cognitive radio research.

  9. 无线移动数字图书馆系统中多媒体检索的同步模式%A synchronization scheme for multimedia retrieval in digital libraries over cellular radio networks

    Institute of Scientific and Technical Information of China (English)

    党德鹏; 周立柱

    2006-01-01

    Recent advances in wireless mobile computing, digital library, and distributed multimedia technologies are stimulating the development of mobile multimedia digital library systems (M2DLS) that allow mobile clients to access multimedia material anywhere and anytime over a cellular radio network. This paper addresses the problem of providing synchronized multimedia retrieval in these systems. An efficient inter-media synchronization scheme called wireless prioritized feedback (WPF) for mobile multimedia on-demand retrieval in digital library systems over CDMA cellular radio networks in the absence of synchronized clocks is presented. In the WPF scheme, base stations use preferential lightweight message called feedback units transmitted by mobile mediaphones to detect and correct asynchronies. The algorithm is described with pseudo code, and experiments are described to demonstrate the efficiency of WPF.

  10. The Allen Telescope Array: The First Widefield, Panchromatic, Snapshot Radio Camera for Radio Astronomy and SETI

    CERN Document Server

    Welch, Jack; Blitz, Leo; Bock, Douglas; Bower, Geoffrey C; Cheng, Calvin; Croft, Steve; Dexter, Matt; Engargiola, Greg; Fields, Ed; Forster, James; Gutierrez-Kraybill, Colby; Heiles, Carl; Helfer, Tamara; Jorgensen, Susanne; Keating, Garrett; Lugten, John; MacMahon, Dave; Milgrome, Oren; Thornton, Douglas; Urry, Lynn; van Leeuwen, Joeri; Werthimer, Dan; Williams, Peter H; Tarter, Melvin Wright Jill; Ackermann, Robert; Atkinson, Shannon; Backus, Peter; Barott, William; Bradford, Tucker; Davis, Michael; DeBoer, Dave; Dreher, John; Harp, Gerry; Jordan, Jane; Kilsdonk, Tom; Pierson, Tom; Randall, Karen; Ross, John; Fleming, Seth Shostak Matt; Cork, Chris; Wadefalk, Artyom Vitouchkine Niklas; Weinreb, Sander

    2009-01-01

    The first 42 elements of the Allen Telescope Array (ATA-42) are beginning to deliver data at the Hat Creek Radio Observatory in Northern California. Scientists and engineers are actively exploiting all of the flexibility designed into this innovative instrument for simultaneously conducting surveys of the astrophysical sky and conducting searches for distant technological civilizations. This paper summarizes the design elements of the ATA, the cost savings made possible by the use of COTS components, and the cost/performance trades that eventually enabled this first snapshot radio camera. The fundamental scientific program of this new telescope is varied and exciting; some of the first astronomical results will be discussed.

  11. Communicating radio astronomy with the public: Another point of view

    Science.gov (United States)

    Varano, S.

    2008-06-01

    Radio waves cannot be sensed directly, but they are used in daily life by almost everybody. Even so, the majority of the general public do not even know that celestial bodies emit radio waves. Presenting invisible radiation to a general audience with little or no background knowledge in physics is a difficult task. In addition, much important technology now commonplace in many other scientific fields was pioneered by radio observatories in their efforts to detect and process radio signals from the Universe. Radio astronomy outreach does not have such a well-established background as optical astronomy outreach. In order to make radio astronomy accessible to the public, it is necessary either to add more scientific detail or to find a different way of communicating. In this paper we present examples from our work at the Visitor Centre "Marcello Ceccarelli", which is part of the Medicina Radio Observatory, operated by the Institute of Radio Astronomy (IRA) in Bologna, which in turn is part of the National Institute for Astrophysics (INAF).

  12. Tecnologia radio cognitiva en la banda ultra high frequency (UHF

    Directory of Open Access Journals (Sweden)

    Hernán Paz Penagos

    2014-01-01

    Full Text Available Mobile cellular communication companies in Colombia require more spectrum resources to expand their portfolio of services. However, additional frequency bands for that particular purpose are scarce, yet it is well known that there are many underutilized licensed bands. Therefore new radio technologies are being studied in order to solve this problem, e.g. Software Defined Radio SDR Cognitive Radio CR and Dynamic Spectrum Access DSA. These strategies recommend mobility across the radio spectrum to meet various needs and achieve greater efficiency when managing such a scarce resource. In this context, a case study is presented in an attempt to examine the require¬ments that must be met for the implementation of cognitive radio networks in Bogota. The case study includes evaluation for the possibility of migration from cellular communications to cognitive radio since the bands assigned to UltraHigh Frequency UHF television offer possible free-of-interference coexistence between the two services (i.e. Cellular and TV. The study shows feasibility to migration; however, the implementations of cognitive radio need availability of hardware, software and flexible radio platforms.

  13. 基于RFID技术的科技馆导览系统研究%Research on the science and technology museum navigation system based on Radio Frequency Identifi cation technology

    Institute of Scientific and Technical Information of China (English)

    王珊珊

    2015-01-01

    基于中国科技馆RFID电子门票的应用,对基于RFID技术的科技馆导览系统进行研究。针对目前导览系统个性化服务不足、数据与信息整合度低、人机交互方式单一、科普性不够等缺点,提出了基于RFID技术的科技馆导览系统的设计原则和解决方案,以期拓展科技馆导览系统的个性化服务模式,加强对观众参观过程的引导,提升观众的参观品质。%This paper analyzes the problems related to the science and technology museum navigation system, and provides a solution for navigation system based on RFID technology, in order to develop personalized service model of the system, strengthen the guidance to the visitors, and improve the quality of the visiting.

  14. Radio Resource sharing in a GSM/GPRS network

    NARCIS (Netherlands)

    Litjens, R.; Boucherie, R.J.

    2000-01-01

    An extensive performance evaluation is presented for a segregated and a hybrid radio resource sharing scheme in an integrated GSM/GPRS network, with a finite queue for data calls that cannot be served immediately upon arrival. Markov chain analysis is used to derive simple performance measures such

  15. Advanced Call Center Supporting WAP Access

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Traditional call centers can be accessed via speech only, and the call center based on web provides both data and speech access, but it needs a powerful terminal-computer. By analyzing traditional call centers and call centers based on web, this paper presents the framework of an advanced call center supporting WAP access. A typical service is also described in detail.

  16. Radio pulsars and transients in the Galactic center

    Energy Technology Data Exchange (ETDEWEB)

    Lazio, Joseph [Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC 20375-5351 (United States); Deneva, J S [Astronomy Department and NAIC, Cornell University, Ithaca, NY 14853 (United States); Bower, Geoffrey C [Astronomy Department and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720 (United States); Cordes, J M [Astronomy Department and NAIC, Cornell University, Ithaca, NY 14853 (United States); Hyman, Scott D [Department of Physics and Engineering, Sweet Briar College, Sweet Briar, VA 24595 (United States); Backer, D C [Astronomy Department and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720 (United States); Bhat, R [Centre for Astrophysics and Supercomputing, Swinburne University, Hawthorn, Victoria 3122 (Australia); Chatterjee, S [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Demorest, P [Astronomy Department and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720 (United States); Ransom, S M [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Vlemmings, W [Jodrell Bank Observatory, University of Manchester, Macclesfleld, Cheshire, SK11 9DL, UK (United Kingdom)

    2006-12-15

    Radio pulsars and transients provide powerful probes of the star formation history, interstellar medium, and gravitational potential of the Galactic center. Historical radio observations of the Galactic center have not emphasized the time domain aspect of observing this region. We summarize a series of recent searches for and observations of radio transients and pulsars that make use of two advances in technology. The first is the formation of large fields of view ({approx}> 1{sup 0}) at relatively longer wavelengths ({lambda} > 1 m), and the second is the construction of receivers and instruments capable of collecting data on microsecond time scales at relatively short wavelengths ({approx} 3 cm)

  17. Towards Ultrahigh Speed Impulse Radio THz Wireless Communications

    DEFF Research Database (Denmark)

    Yu, Xianbin; Galili, Michael; Morioka, Toshio

    2015-01-01

    THz impulse radio technologies promise a new paradigm of fast wireless access with simplified wireless reception. However, huge loss of propagating broad bandwidth THz impulse radio signals limits THz wireless transmission distance and reduces the achievable link data rates. In this paper, we...... evaluate the realistic throughput and accessible wireless range of a THz impulse radio communication link based on a uni-travelling photodiode (UTC-PD) as THz emitter and a photoconductive antenna (PCA) as THz receiver. The impact of highly frequency-selective THz channel and the noise in the system...

  18. Coherent detection of orbital angular momentum in radio

    CERN Document Server

    Daldorff, L K S; Bergman, J E S; Isham, B; Al-Nuaimi, M K T; Forozesh, K; Carozzi, T D

    2015-01-01

    The angular momentum propagated by a beam of radiation has two contributions: spin angular momentum (SAM) and orbital angular momentum (OAM). SAM corresponds to wave polarisation, while OAM-carrying beams are characterized by a phase which is a function of azimuth. We demonstrate experimentally that radio beams propagating OAM can be generated and coherently detected using ordinary electric dipole antennas. The results presented here could pave the way for novel radio OAM applications in technology and science, including radio communication, passive remote sensing, and new types of active (continuous or pulsed transmission) electromagnetic measurements.

  19. Radio resource management using geometric water-filling

    CERN Document Server

    He, Peter; Zhou, Sheng; Niu, Zhisheng

    2014-01-01

    This brief introduces the fundamental theory and development of managing radio resources using a water-filling algorithm that can optimize system performance in wireless communication. Geometric Water-Filling (GWF) is a crucial underlying tool in emerging communication systems such as multiple input multiple output systems, cognitive radio systems, and green communication systems. Early chapters introduce emerging wireless technologies and provide a detailed analysis of water-filling. The brief investigates single user and multi-user issues of radio resource management, allocation of resources

  20. Wireless communication technologies in distribution automation

    Energy Technology Data Exchange (ETDEWEB)

    Takala, J. [VTT Energy, Espoo (Finland)

    1998-08-01

    The project started in mid 1995 and will be finished in 1997. The project examines four different wireless communication technologies: GSM short message service, NMT data calls, packet radio network and Autonet (Actionet) status message service. The targets for communication include: Energy measurement, especially in the de-regulated electricity market, secondary sub-station control and fault indicators. The research has been focused on the usability of different communication technologies for different purposes. Data about response times, reliability, error rates, retry times, communication delays, costs etc. has been collected about each communication technology and comparative results were analysed. Some field experiments and demonstrations will be made in energy measurement and distribution network remote control. The project is divided into four tasks. Each task is described briefly

  1. Recent developments in terahertz sensing technology

    Science.gov (United States)

    Shur, Michael

    2016-05-01

    Terahertz technology has found numerous applications for the detection of biological and chemical hazardous agents, medical diagnostics, detection of explosives, providing security in buildings, airports, and other public spaces, shortrange covert communications (in the THz and sub-THz windows), and applications in radio astronomy and space research. The expansion of these applications will depend on the development of efficient electronic terahertz sources and sensitive low-noise terahertz detectors. Schottky diode frequency multipliers have emerged as a viable THz source technology reaching a few THz. High speed three terminal electronic devices (FETs and HBTs) have entered the THz range (with cutoff frequencies and maximum frequencies of operation above 1 THz). A new approach called plasma wave electronics recently demonstrated an efficient terahertz detection in GaAs-based and GaN-based HEMTs and in Si MOS, SOI, FINFETs and in FET arrays. This progress in THz electronic technology has promise for a significant expansion of THz applications.

  2. FPGA applications for single dish activity at Medicina radio telescopes

    Science.gov (United States)

    Bartolin, M.; Nald, G.; Mattan, A.; Maccaferr, A.; De Biagg, M.

    FPGA technologies are gaining major attention in the recent years in the field of radio astronomy. At Medicina radio telescopes, FPGAs have been used in the last ten years for a number of purposes and in this article we will take into exam the applications developed and installed for the Medicina Single Dish 32m Antenna: these range from high performance digital signal processing to instrument control developed on top of smaller FPGAs.

  3. Properties of centralized cooperative sensing in cognitive radio networks

    Science.gov (United States)

    Skokowski, Paweł; Malon, Krzysztof; Łopatka, Jerzy

    2017-04-01

    Spectrum sensing is a functionality that enables network creation in the cognitive radio technology. Spectrum sensing is use for building the situation awareness knowledge for better use of radio resources and to adjust network parameters in case of jamming, interferences from legacy systems, decreasing link quality caused e.g. by nodes positions changes. This paper presents results from performed tests to compare cooperative centralized sensing versus local sensing. All tests were performed in created simulator developed in Matlab/Simulink environment.

  4. The LOFAR radio environment

    CERN Document Server

    Offringa, A R; Zaroubi, S; van Diepen, G; Martinez-Ruby, O; Labropoulos, P; Brentjens, M A; Ciardi, B; Daiboo, S; Harker, G; Jelic, V; Kazemi, S; Koopmans, L V E; Mellema, G; Pandey, V N; Pizzo, R F; Schaye, J; Vedantham, H; Veligatla, V; Wijnholds, S J; Yatawatta, S; Zarka, P; Alexov, A; Anderson, J; Asgekar, A; Avruch, M; Beck, R; Bell, M; Bell, M R; Bentum, M; Bernardi, G; Best, P; Birzan, L; Bonafede, A; Breitling, F; Broderick, J W; Bruggen, M; Butcher, H; Conway, J; de Vos, M; Dettmar, R J; Eisloeffel, J; Falcke, H; Fender, R; Frieswijk, W; Gerbers, M; Griessmeier, J M; Gunst, A W; Hassall, T E; Heald, G; Hessels, J; Hoeft, M; Horneffer, A; Karastergiou, A; Kondratiev, V; Koopman, Y; Kuniyoshi, M; Kuper, G; Maat, P; Mann, G; McKean, J; Meulman, H; Mevius, M; Mol, J D; Nijboer, R; Noordam, J; Norden, M; Paas, H; Pandey, M; Pizzo, R; Polatidis, A; Rafferty, D; Rawlings, S; Reich, W; Rottgering, H J A; Schoenmakers, A P; Sluman, J; Smirnov, O; Sobey, C; Stappers, B; Steinmetz, M; Swinbank, J; Tagger, M; Tang, Y; Tasse, C; van Ardenne, A; van Cappellen, W; van Duin, A P; van Haarlem, M; van Leeuwen, J; van Weeren, R J; Vermeulen, R; Vocks, C; Wijers, R A M J; Wise, M; Wucknitz, O

    2012-01-01

    Aims: This paper discusses the spectral occupancy for performing radio astronomy with the Low-Frequency Array (LOFAR), with a focus on imaging observations. Methods: We have analysed the radio-frequency interference (RFI) situation in two 24-h surveys with Dutch LOFAR stations, covering 30-78 MHz with low-band antennas and 115-163 MHz with high-band antennas. This is a subset of the full frequency range of LOFAR. The surveys have been observed with a 0.76 kHz / 1 s resolution. Results: We measured the RFI occupancy in the low and high frequency sets to be 1.8% and 3.2% respectively. These values are found to be representative values for the LOFAR radio environment. Between day and night, there is no significant difference in the radio environment. We find that lowering the current observational time and frequency resolutions of LOFAR results in a slight loss of flagging accuracy. At LOFAR's nominal resolution of 0.76 kHz and 1 s, the false-positives rate is about 0.5%. This rate increases approximately linear...

  5. Division x: Radio Astronomy

    NARCIS (Netherlands)

    Taylor, Russ; Chapman, Jessica; Rendong, Nan; Carilli, Christopher; Giovannini, Gabriele; Hills, Richard; Hirabayashi, Hisashi; Jonas, Justin; Lazio, Joseph; Morganti, Raffaella; Rubio, Monica; Shastri, Prajval

    This triennium has seen a phenomenal investment in development of observational radio astronomy facilities in all parts of the globe at a scale that significantly impacts the international community. This includes both major enhancements such as the transition from the VLA to the EVLA in North

  6. Educational Broadcasting--Radio.

    Science.gov (United States)

    Ahamed, Uvais; Grimmett, George

    This manual is intended for those who must conduct educational radio broadcasting training courses in Asia-Pacific countries without the resources of experienced personnel, as well as for individuals to use in self-learning situations. The selection of material has been influenced by the need to use broadcasting resources effectively in programs…

  7. Albanian: Basic Radio Communications.

    Science.gov (United States)

    Defense Language Inst., Washington, DC.

    This volume has been designed as a supplement to a course in Albanian developed by the Defense Language Institute. The emphasis in this text is placed on radio communications instruction. The volume is divided into five exercises, each of which contains a vocabulary, dictation, and an air-to-ground communications procedure conducted in Albanian…

  8. Valuing commercial radio licences

    NARCIS (Netherlands)

    Kerste, M.; Poort, J.; van Eijk, N.

    2011-01-01

    Within the EU Regulatory Framework, licensees for commercial radio broadcasting may be charged a fee to ensure optimal allocation of scarce resources but not to maximize public revenues. In this paper, it is described how such a fee can be determined for the purpose of licence renewal or extension.

  9. Zelenchukskaya Radio Astronomical Observatory

    Science.gov (United States)

    Smolentsev, Sergey; Dyakov, Andrei

    2013-01-01

    This report summarizes information about Zelenchukskaya Radio Astronomical Observatory activities in 2012. Last year a number of changes took place in the observatory to improve some technical characteristics and to upgrade some units to the required status. The report provides an overview of current geodetic VLBI activities and gives an outlook for the future.

  10. Svetloe Radio Astronomical Observatory

    Science.gov (United States)

    Smolentsev, Sergey; Rahimov, Ismail

    2013-01-01

    This report summarizes information about the Svetloe Radio Astronomical Observatory activities in 2012. Last year, a number of changes took place in the observatory to improve some technical characteristics and to upgrade some units to their required status. The report provides an overview of current geodetic VLBI activities and gives an outlook for the future.

  11. Low Frequency Radio Astronomy Summary: A Festschrift For Bill Erickson

    Science.gov (United States)

    Clark, B. G.; Kassim, N. E.; Perez, M. R.

    2005-12-01

    The science and technological issues presented at this workshop in honor of Bill Erickson's 74th birthday, are certainly opening up a new window of astronomical observations at the low end of the radio frequency spectrum. We briefly review some of the contributions concentrating our comments on the topics of science, technology, and history.

  12. Dust tori in radio galaxies

    NARCIS (Netherlands)

    van der Wolk, G.; Barthel, P. D.; Peletier, R. F.; Pel, J. W.

    2010-01-01

    Aims: We investigate the quasar - radio galaxy unification scenario and detect dust tori within radio galaxies of various types. Methods: Using VISIR on the VLT, we acquired sub-arcsecond (~0.40 arcsec) resolution N-band images, at a wavelength of 11.85 μm, of the nuclei of a sample of 27 radio gala

  13. Extragalactic radio continuum surveys and the transformation of radio astronomy

    Science.gov (United States)

    Norris, Ray P.

    2017-10-01

    Next-generation radio surveys are about to transform radio astronomy by discovering and studying tens of millions of previously unknown radio sources. These surveys will provide fresh insights for understanding the evolution of galaxies, measuring the evolution of the cosmic star-formation rate, and rivalling traditional techniques in the measurement of fundamental cosmological parameters. By observing a new volume of observational parameter space, they are also likely to discover unexpected phenomena. This Review traces the evolution of extragalactic radio continuum surveys from the earliest days of radio astronomy to the present, and identifies the challenges that must be overcome to achieve this transformational change.

  14. SMART TRAVELLING WITH RADIO FREQUENCY IDENTIFICATION

    Directory of Open Access Journals (Sweden)

    Zainab Rasheed Fahad Mirza

    2013-01-01

    Full Text Available Radio Frequency Identification (RFID technology is being widely used now-a-days and is becoming more popular with every passing day. There are varied applications of this technology in various fields such as industry, communication, travel and transportation. Roads, rail ways, air traffic and container vessel shipping all share underlying abstractions of transportation nets with hubs. This study is concerned with applications of RFID technology with Cloud computing, innovation in the field of travelling and its applications for different modes of transportation at Harbors, airports, train stations, road intersections providing security, coordination, to the users. Combined with other technologies, RFID technology is being used for modern airports baggage system, for railroad car identification, in container transportation systems, for fuel supply control of vehicles, in traffic management system and in travelling information system.

  15. The experience of work in a call centre environment

    Directory of Open Access Journals (Sweden)

    Sanet Hauptfleisch

    2006-02-01

    Full Text Available This qualitative research study explored the work experience in a call centre environment in an information technology call centre based in South Africa, which service foreign customers exclusively. Three data collection methods were used, namely narratives, in-depth interviews with call centre consultants, and observation. Following a grounded theory approach, four themes were elicited, namely the perceptions of team members, uncertainty created by a constantly changing environment, perceived distances due to management practices, and depersonalisation experienced while actually dealing with customers. In addition to this, the reported impact of these themes on work performance was explored and compared to existing research.

  16. INOVASI RADIO KAMPUS (RANCANG BANGUN RADIO UDINUS DENGAN INOVASI TEKNOLOGI @RADIO

    Directory of Open Access Journals (Sweden)

    Wellia Shinta Sari

    2014-08-01

    Full Text Available Perkembangan Teknologi Informasi dan Komunikasi (TIK memaksa industri penyiaran untuk ikut menyesuaikan diri. Radio konvensional bisa jadi akan tertinggal jika tidak melakukan inovasi teknologi yang ada. Begitu juga dengan radio kampus, yang keberadaannya sangat dibutuhkan sebagai wadah kreativitas dan sarana pembelajaran di sebuah universitas, apalagi yang memiliki program studi penyiaran. Radio kampus Suara Dian yang masih konvensional sehingga hampir kehilangan eksistensinya harus segera dibenahi dan dihidupkan kembali dengan mengikuti perkembangan teknologi di era konvergensi. Metode Inovasi teknologi yang bisa dilakukan adalah dengan menggunakan teknologi @Radio Streaming, yang bukan sekedar streaming, tapi juga optimalisasi teknologi yang terintegrasi dinamis melalui RISE (Radio Broadcasting Integrated System. Dengan berbagai fitur unggul dari inovasi teknologi tersebut, maka diharapkan Radio kampus Udinus ”Suara Dian” dapat kembali hidup, berkembang dan lebih kompetitif ditengah industri penyiaran Radio. Kata kunci : radio, kampus, konvergensi, streaming.

  17. The importance of Radio Quiet Zone (RQZ) for radio astronomy

    Science.gov (United States)

    Umar, Roslan; Abidin, Zamri Zainal; Ibrahim, Zainol Abidin

    2013-05-01

    Most of radio observatories are located in isolated areas. Since radio sources from the universe is very weak, astronomer need to avoid radio frequency interference (RFI) from active spectrum users and radio noise produced by human made (telecommunication, mobile phone, microwave user and many more. There are many observatories around the world are surrounded by a Radio Quiet Zone (RQZ), which is it was set up using public or state laws. A Radio Quiet Zone normally consists of two areas: an exclusive area in which totally radio emissions are forbidden, with restrictions for residents and business developments, and a larger (radius up to 100 km above) coordination area where the power of radio transmission limits to threshold levels. Geographical Information System (GIS) can be used as a powerful tool in mapping large areas with varying RQZ profiles. In this paper, we report the initial testing of the usage of this system in order to identify the areas were suitable for Radio Quiet Zone. Among the important parameters used to develop the database for our GIS are population density, information on TV and telecommunication (mobile phones) transmitters, road networks (highway), and contour shielding. We will also use other information gathered from on-site RFI level measurements on selected 'best' areas generated by the GIS. The intention is to find the best site for the purpose of establishing first radio quiet zones for radio telescope in Malaysia.

  18. South African Student Constructed Indlebe Radio Telescope

    Science.gov (United States)

    McGruder, Charles H.; MacPherson, Stuart; Janse Van Vuuren, Gary Peter

    2017-01-01

    The Indlebe Radio Telescope (IRT) is a small transit telescope with a 5 m diameter parabolic reflector working at 21 cm. It was completely constructed by South African (SA) students from the Durban University of Technology (DUT), where it is located. First light occurred on 28 July 2008, when the galactic center, Sagittarius A, was detected. As a contribution to the International Year of Astronomy in 2009, staff members in the Department of Electronic Engineering at DUT in 2006 decided to have their students create a fully functional radio telescope by 2009. The specific project aims are to provide a visible project that could generate interest in science and technology in high school students and to provide a real world system for research in radio astronomy in general and an optimization of low noise radio frequency receiver systems in particular. These aims must be understood in terms of the SA’s government interests in radio astronomy. SA is a partner in the Square Kilometer Array (SKA) project, has constructed the Karoo Array Telescope (KAT) and MeerKat, which is the largest and most sensitive radio telescope in the southern hemisphere. SA and its partners in Africa are investing in the construction of the African Very Long Baseline Interferometry Network (AVN), an array of radio telescopes throughout Africa as an extension of the existing global Very Long Baseline Interferometry Network (VLBI). These projects will allow SA to make significant contributions to astronomy and enable astronomy to contribute to the scientific education and development goals of the country. The IRT sees on a daily basis the transit of Sag A. The transit time is influenced by precession, nutation, polar motion, aberration, celestial pole offset, proper motion, length of the terrestrial day and variable ionospheric refraction. Of these eight factors six are either predictable or measureable. To date neither celestial pole offset nor variable ionospheric refraction are predicable

  19. Effects of interactions on the radio properties of non-Seyfert galaxies

    Energy Technology Data Exchange (ETDEWEB)

    Giuricin, G.; Mardirossian, F.; Mezzetti, M. (Trieste Univ. (Italy). Dip. di Astronomia Centro Interuniversitario Regionale per l' Astrofisica a la Cosmologia (CIRAC), Trieste (Italy)); Bertotti, G. (Center for Advanced Research in Space Optics, Trieste (Italy))

    1990-12-01

    On the basis of radiosurveys published in the literature we have compared the radio properties of samples of relatively isolated spiral galaxies with LINER- and H II-region-like nuclei (hereafter called L and H galaxies) with corresponding samples of non-Seyfert interacting galaxies, in order to explore the effects of interactions on their radio properties. Our statistical study reveals basic structural differences between the radio properties of the L, H and Seyfert galaxies, and between the effects of interactions on the radio properties of the three classes of galaxies. (author).

  20. Calling patterns in human communication dynamics.

    Science.gov (United States)

    Jiang, Zhi-Qiang; Xie, Wen-Jie; Li, Ming-Xia; Podobnik, Boris; Zhou, Wei-Xing; Stanley, H Eugene

    2013-01-29

    Modern technologies not only provide a variety of communication modes (e.g., texting, cell phone conversation, and online instant messaging), but also detailed electronic traces of these communications between individuals. These electronic traces indicate that the interactions occur in temporal bursts. Here, we study intercall duration of communications of the 100,000 most active cell phone users of a Chinese mobile phone operator. We confirm that the intercall durations follow a power-law distribution with an exponential cutoff at the population level but find differences when focusing on individual users. We apply statistical tests at the individual level and find that the intercall durations follow a power-law distribution for only 3,460 individuals (3.46%). The intercall durations for the majority (73.34%) follow a Weibull distribution. We quantify individual users using three measures: out-degree, percentage of outgoing calls, and communication diversity. We find that the cell phone users with a power-law duration distribution fall into three anomalous clusters: robot-based callers, telecom fraud, and telephone sales. This information is of interest to both academics and practitioners, mobile telecom operators in particular. In contrast, the individual users with a Weibull duration distribution form the fourth cluster of ordinary cell phone users. We also discover more information about the calling patterns of these four clusters (e.g., the probability that a user will call the c(r)-th most contact and the probability distribution of burst sizes). Our findings may enable a more detailed analysis of the huge body of data contained in the logs of massive users.