Thematische Bibliographien / Network telescope

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Auswahl der wissenschaftlichen Literatur zum Thema „Network telescope“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Network telescope"

Chou, Dean-Yi, Ming-Tsung Sun, Javier Fernandez Fernandez, Li-Han Wang, Antonio Jimenez, Alexander Serebryanskiy und Shuhrat Ehgamberdiev. „Taiwan Automated Telescope Network“. Advances in Astronomy 2010 (2010): 1–4. http://dx.doi.org/10.1155/2010/125340.

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A global network of small automated telescopes, the Taiwan Automated Telescope (TAT) network, dedicated to photometric measurements of stellar pulsations, is under construction. Two telescopes have been installed in Teide Observatory, Tenerife, Spain and Maidanak Observatory, Uzbekistan. The third telescope will be installed at Mauna Loa Observatory, Hawaii, USA. Each system uses a 9-cm Maksutov-type telescope. The effective focal length is 225 cm, corresponding to anf-ratio of 25. The field of view is 0.62 degree square. The images are taken with a 16-bit1024×1024CCD camera. The telescope is equipped with UBVRI filters. Each telescope is fully automated. The telescope can be operated either interactively or fully automatically. In the interactive mode, it can be controlled through the Internet. In the fully automatic mode, the telescope operates with preset parameters without any human care, including taking dark frames and flat frames. The network can also be used for studies that require continuous observations for selected objects.

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López-Casado, C., C. J. Pérez del Pulgar, E. Fernández, V. F. Muñoz und A. Castro-Tirado. „GLSCH: OBSERVATION SCHEDULER FOR THE GLORIA TELESCOPE NETWORK“. Revista Mexicana de Astronomía y Astrofísica Serie de Conferencias 51 (13.04.2019): 111–15. http://dx.doi.org/10.22201/ia.14052059p.2019.51.18.

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This paper proposes the design and development of a scheduler for the GLORIA telescope network. This network, which main objective is to make astronomy closer to citizens in general, is formed by 18 telescopes spread over four continents and both hemispheres. Part of the management of this network is made by the network scheduler. It receives the observation requests made by the GLORIA users and then sends it to the most suitable telescope. A key module of the network scheduler is the telescope decision algorithm that makes possible to choose the best telescope, and thus avoiding offering an observation to a telescope that cannot execute it. This paper shows two different telescope decision algorithms: the first one is only based on weather forecast, meanwhile the second one uses fuzzy logic and information from each network telescope. Both algorithms were deployed in the GLORIA network. The achieved results coupled with a comparative of their performance is shown. Moreover, the network scheduler architecture, based on a hybrid distributed-centralized schema, is detailed.

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Elliott, Ian. „Requirements of a network telescope“. Symposium - International Astronomical Union 123 (1988): 541–44. http://dx.doi.org/10.1017/s0074180900158668.

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General purpose telescopes fail to provide a cost-effective means of obtaining photometric data for asteroseismology. A continuous observing run on a particular star is best suited to automatic operation with a dedicated photoelectric telescope. As optical requirements for on-axis photometry are less severe than those for imaging, low-cost light-weight mirrors permit a saving in the size and cost of mount and dome. A stiff mounting with a low moment of inertia permits rapid movement under computer control. Adoption of a permanently mounted photometer and the elimination of manual controls also leads to design and operating economies. Maintenance can be shared with other instruments and travel and subsistence requirements are minimised. Therefore remote operation of a network of automatic telescopes at good sites could provide high quality data at reasonable cost.

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Wang, Jing-Sheng. „Newly Installed Radio and Optical Telescopes in China“. Publications of the Astronomical Society of Australia 9, Nr. 1 (1991): 60–61. http://dx.doi.org/10.1017/s1323358000024899.

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AbstractNew radio and optical telescopes installed in recent years in China are summarised. These include the 2.16-m optical telescope, the solar magnetic field telescope, the Miyun synthesis radio telescope, the 1.26-m infrared telescope (Beijing Astronomical Observatory), the 25-m radio telescope as the first station of China’s VLBI network, the 1.56-m astrometric telescope (Shanghai Observatory), and the 13.7-m millimetre wave radio telescope.

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Gomez, E. L. „Las Cumbres Observatory: Building a global telescope network from the ground up“. Proceedings of the International Astronomical Union 10, H16 (August 2012): 646. http://dx.doi.org/10.1017/s1743921314012678.

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AbstractLas Cumbres Observatory Global Telescope Network (LCOGT) are building a global network of telescopes which will be available to both professional scientists and the science curious public. This telescope network will be global and so will the community, therefore all aspects of the endeavour must be online and self-sustaining - from the observing software to the analysis tools. During 2012 LCOGT have deployed the first 1-meter telescopes, and launched a citizen science project using LCOGT data, Agent Exoplanet, as well as many other online resources for anyone to use as they explore astronomy.

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Street, R. A., T. A. Lister, Y. Tsapras, A. Shporer, F. B. Bianco, B. J. Fulton, D. A. Howell et al. „A Global Robotic Telescope Network for Time-Domain Science“. Proceedings of the International Astronomical Union 7, S285 (September 2011): 408–10. http://dx.doi.org/10.1017/s174392131200124x.

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AbstractLas Cumbres Observatory Global Telescope Network (LCOGT) is currently building a new kind of general-purpose astronomical facility: a fully robotic network of telescopes of 2m, 1m and 0.4m apertures and homogeneous instrumentation. A pan-network approach to scheduling (rather than per individual telescope) offers redundancy in the event of poor weather or technical failure, as well as the ability to observe a target around the clock. Here we describe the network design and instrumentation under development, together with the main science programmes already being lead by LCOGT staff.

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Shporer, Avi, Tim Brown, Tim Lister, Rachel Street, Yiannis Tsapras, Federica Bianco, Benjamin Fulton und Andy Howell. „The LCOGT Network“. Proceedings of the International Astronomical Union 6, S276 (Oktober 2010): 553–55. http://dx.doi.org/10.1017/s1743921311021193.

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AbstractMotivated by the increasing need for observational resources for the study of time varying astronomy, the Las Cumbres Observatory Global Telescope (LCOGT) is a private foundation, whose goal is to build a global network of robotic telescopes for scientific research and education. Once completed, the network will become a unique tool, capable of continuous monitoring from both the Northern and Southern Hemispheres. The network currently includes 2 × 2.0 m telescopes, already making an impact in the field of exoplanet research. In the next few years they will be joined by at least 12 × 1.0 m and 20 × 0.4 m telescopes. The increasing amount of LCOGT observational resources in the coming years will be of great service to the astronomical community in general, and the exoplanet community in particular.

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Majcher, Ariel, Arkadiusz Cwiek, Mikołaj Cwiok, Lech Mankiewicz, Marcin Zaremba und Aleksander F. Zarnecki. „“PI OF THE SKY” OFF-LINE EXPERIMENT WITH GLORIA“. Acta Polytechnica 54, Nr. 3 (27.06.2014): 205–9. http://dx.doi.org/10.14311/ap.2014.54.0205.

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GLORIA is the first free and open-access network of robotic telescopes in the world. Based on the Web 2.0 environment, amateur and professional users can do research in astronomy by observing with robotic telescope, and/or analyzing data acquired with GLORIA, or from other free access databases. The GLORIA project develops free standards, protocols and tools for controlling Robotic Telescopes and related instrumentation, for scheduling observations in the telescope network, and for conducting so-called off-line experiments based on the analysis of astronomical data. This contribution summarizes the implementation and results from the first research level off-line demonstrator experiment implemented in GLORIA, which was based on data collected with the “Pi of the Sky” telescope in Chile.

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Duncan, A. R. „Observation Scheduling for a Network of Small-Aperture Telescopes“. Publications of the Astronomical Society of Australia 24, Nr. 2 (2007): 53–60. http://dx.doi.org/10.1071/as07011.

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AbstractOver the past several years, a system for accepting, servicing and returning the results from a large number of imaging requests has been developed for use with automated optical telescopes. One of the primary goals of this project is to increase the accessibility of astronomy to school, college and university students. A key component of this system is a request scheduling engine, which produces schedules for each telescope for its current night. This engine is dynamic, adjusting schedules to accommodate new requests and rescheduling failed requests on a time scale of the order of ten minutes. If a telescope is unavailable for an extended period, imaging requests will be reallocated to other telescopes in the network. Various models of dynamic scheduling are considered, and the current implementation is explored with a number of numerical experiments.

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Hidas, M. G., E. Hawkins, Z. Walker, T. M. Brown und W. E. Rosing. „Las Cumbres Observatory Global Telescope: A homogeneous telescope network“. Astronomische Nachrichten 329, Nr. 3 (März 2008): 269–70. http://dx.doi.org/10.1002/asna.200710950.

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Dissertationen zum Thema "Network telescope"

Baer, Robert A. „OBSERVING EXOPLANET TRANSITS WITH THE CITIZEN CONTINENTAL-AMERICA TELESCOPIC ECLIPSE (CATE) EXPERIMENT TELESCOPE NETWORK“. OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2487.

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The Citizen Continental-America Telescopic Eclipse (CATE) Experiment established a standardized set of observation procedures and 72 volunteer observation teams with identical equipment along the path of the 2017 total solar eclipse. CATE successfully imaged the solar corona from 66 of the 72 observation sites resulting in a high dynamic range animation of 90 minutes of solar corona data collected by volunteer citizen science teams. A subgroup of CATE began work in the fall of 2017 to evaluate use of the standard CATE observation setup for exoplanet transit observations. Light curves and analysis of data using AstroImageJ of two well know transiting exoplanets, HD209458b (V = 7.65, depth = 1.5%) and HD189733b (V= 7.67, depth=2.4%) are presented along with modifications to CATE telescopes required for successful exoplanet follow up observations.

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Irwin, Barry Vivian William. „A framework for the application of network telescope sensors in a global IP network“. Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1004835.

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The use of Network Telescope systems has become increasingly popular amongst security researchers in recent years. This study provides a framework for the utilisation of this data. The research is based on a primary dataset of 40 million events spanning 50 months collected using a small (/24) passive network telescope located in African IP space. This research presents a number of differing ways in which the data can be analysed ranging from low level protocol based analysis to higher level analysis at the geopolitical and network topology level. Anomalous traffic and illustrative anecdotes are explored in detail and highlighted. A discussion relating to bogon traffic observed is also presented. Two novel visualisation tools are presented, which were developed to aid in the analysis of large network telescope datasets. The first is a three-dimensional visualisation tool which allows for live, near-realtime analysis, and the second is a two-dimensional fractal based plotting scheme which allows for plots of the entire IPv4 address space to be produced, and manipulated. Using the techniques and tools developed for the analysis of this dataset, a detailed analysis of traffic recorded as destined for port 445/tcp is presented. This includes the evaluation of traffic surrounding the outbreak of the Conficker worm in November 2008. A number of metrics relating to the description and quantification of network telescope configuration and the resultant traffic captures are described, the use of which it is hoped will facilitate greater and easier collaboration among researchers utilising this network security technology. The research concludes with suggestions relating to other applications of the data and intelligence that can be extracted from network telescopes, and their use as part of an organisation’s integrated network security systems

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Cowie, Bradley. „An exploratory study of techniques in passive network telescope data analysis“. Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1002038.

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Careful examination of the composition and concentration of malicious traffic in transit on the channels of the Internet provides network administrators with a means of understanding and predicting damaging attacks directed towards their networks. This allows for action to be taken to mitigate the effect that these attacks have on the performance of their networks and the Internet as a whole by readying network defences and providing early warning to Internet users. One approach to malicious traffic monitoring that has garnered some success in recent times, as exhibited by the study of fast spreading Internet worms, involves analysing data obtained from network telescopes. While some research has considered using measures derived from network telescope datasets to study large scale network incidents such as Code-Red, SQLSlammer and Conficker, there is very little documented discussion on the merits and weaknesses of approaches to analyzing network telescope data. This thesis is an introductory study in network telescope analysis and aims to consider the variables associated with the data received by network telescopes and how these variables may be analysed. The core research of this thesis considers both novel and previously explored analysis techniques from the fields of security metrics, baseline analysis, statistical analysis and technical analysis as applied to analysing network telescope datasets. These techniques were evaluated as approaches to recognize unusual behaviour by observing the ability of these techniques to identify notable incidents in network telescope datasets

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Marušiak, Martin. „Analýza zpětně rozptýleného DDoS provozu v datech o síťových tocích“. Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2021. http://www.nusl.cz/ntk/nusl-445542.

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This work focuses on detection of denial of service (DoS) attacks which utilize random spoofing of source IP address in attack packets. These types of attacks lead to generation of side effect in a form of backscatter that can be used to identify victims of such attacks. Backscatter analysis has so far been limited to unused address space ranges referred to as network telescopes. This work therefore proposes a new method of DoS attack detection via backscatter outside of network telescope environment where legitimate user traffic is also present. Furthermore proposed approach uses only abstracted traffic in a form of network flows. Presented method was implemented as part of NEMEA system and tested on real flow data capture provided by CESNET.

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Morgan, John <1981&gt. „Very Long Baseline Interferometry in Italy Wide-field VLBI imaging and astrometry and prospects for an Italian VLBI network including the Sardinia Radio Telescope“. Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2830/.

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In this thesis the use of widefield imaging techniques and VLBI observations with a limited number of antennas are explored. I present techniques to efficiently and accurately image extremely large UV datasets. Very large VLBI datasets must be reduced into multiple, smaller datasets if today’s imaging algorithms are to be used to image them. I present a procedure for accurately shifting the phase centre of a visibility dataset. This procedure has been thoroughly tested and found to be almost two orders of magnitude more accurate than existing techniques. Errors have been found at the level of one part in 1.1 million. These are unlikely to be measurable except in the very largest UV datasets. Results of a four-station VLBI observation of a field containing multiple sources are presented. A 13 gigapixel image was constructed to search for sources across the entire primary beam of the array by generating over 700 smaller UV datasets. The source 1320+299A was detected and its astrometric position with respect to the calibrator J1329+3154 is presented. Various techniques for phase calibration and imaging across this field are explored including using the detected source as an in-beam calibrator and peeling of distant confusing sources from VLBI visibility datasets. A range of issues pertaining to wide-field VLBI have been explored including; parameterising the wide-field performance of VLBI arrays; estimating the sensitivity across the primary beam both for homogeneous and heterogeneous arrays; applying techniques such as mosaicing and primary beam correction to VLBI observations; quantifying the effects of time-average and bandwidth smearing; and calibration and imaging of wide-field VLBI datasets. The performance of a computer cluster at the Istituto di Radioastronomia in Bologna has been characterised with regard to its ability to correlate using the DiFX software correlator. Using existing software it was possible to characterise the network speed particularly for MPI applications. The capabilities of the DiFX software correlator, running on this cluster, were measured for a range of observation parameters and were shown to be commensurate with the generic performance parameters measured. The feasibility of an Italian VLBI array has been explored, with discussion of the infrastructure required, the performance of such an array, possible collaborations, and science which could be achieved. Results from a 22 GHz calibrator survey are also presented. 21 out of 33 sources were detected on a single baseline between two Italian antennas (Medicina to Noto). The results and discussions presented in this thesis suggest that wide-field VLBI is a technique whose time has finally come. Prospects for exciting new science are discussed in the final chapter.

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Nkhumeleni, Thizwilondi Moses. „Correlation and comparative analysis of traffic across five network telescopes“. Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1011668.

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Monitoring unused IP address space by using network telescopes provides a favourable environment for researchers to study and detect malware, worms, denial of service and scanning activities. Research in the field of network telescopes has progressed over the past decade resulting in the development of an increased number of overlapping datasets. Rhodes University's network of telescope sensors has continued to grow with additional network telescopes being brought online. At the time of writing, Rhodes University has a distributed network of five relatively small /24 network telescopes. With five network telescope sensors, this research focuses on comparative and correlation analysis of traffic activity across the network of telescope sensors. To aid summarisation and visualisation techniques, time series' representing time-based traffic activity, are constructed. By employing an iterative experimental process of captured traffic, two natural categories of the five network telescopes are presented. Using the cross- and auto-correlation methods of time series analysis, moderate correlation of traffic activity was achieved between telescope sensors in each category. Weak to moderate correlation was calculated when comparing category A and category B network telescopes' datasets. Results were significantly improved by studying TCP traffic separately. Moderate to strong correlation coefficients in each category were calculated when using TCP traffic only. UDP traffic analysis showed weaker correlation between sensors, however the uniformity of ICMP traffic showed correlation of traffic activity across all sensors. The results confirmed the visual observation of traffic relativity in telescope sensors within the same category and quantitatively analysed the correlation of network telescopes' traffic activity.

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Shaikh, Farooq Israr Ahmed. „Security Framework for the Internet of Things Leveraging Network Telescopes and Machine Learning“. Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7935.

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The recent advancements in computing and sensor technologies, coupled with improvements in embedded system design methodologies, have resulted in the novel paradigm called the Internet of Things (IoT). IoT is essentially a network of small embedded devices enabled with sensing capabilities that can interact with multiple entities to relay information about their environments. This sensing information can also be stored in the cloud for further analysis, thereby reducing storage requirements on the devices themselves. The above factors, coupled with the ever increasing needs of modern society to stay connected at all times, has resulted in IoT technology penetrating all facets of modern life. In fact IoT systems are already seeing widespread applications across multiple industries such as transport, utility, manufacturing, healthcare, home automation, etc. Although the above developments promise tremendous benefits in terms of productivity and efficiency, they also bring forth a plethora of security challenges. Namely, the current design philosophy of IoT devices, which focuses more on rapid prototyping and usability, results in security often being an afterthought. Furthermore, one needs to remember that unlike traditional computing systems, these devices operate under the assumption of tight resource constraints. As such this makes IoT devices a lucrative target for exploitation by adversaries. This inherent flaw of IoT setups has manifested itself in the form of various distributed denial of service (DDoS) attacks that have achieved massive throughputs without the need for techniques such as amplification, etc. Furthermore, once exploited, an IoT device can also function as a pivot point for adversaries to move laterally across the network and exploit other, potentially more valuable, systems and services. Finally, vulnerable IoT devices operating in industrial control systems and other critical infrastructure setups can cause sizable loss of property and in some cases even lives, a very sobering fact. In light of the above, this dissertation research presents several novel strategies for identifying known and zero-day attacks against IoT devices, as well as identifying infected IoT devices present inside a network along with some mitigation strategies. To this end, network telescopes are leveraged to generate Internet-scale notions of maliciousness in conjunction with signatures that can be used to identify such devices in a network. This strategy is further extended by developing a taxonomy-based methodology which is capable of categorizing unsolicited IoT behavior by leveraging machine learning (ML) techniques, such as ensemble learners, to identify similar threats in near-real time. Furthermore, to overcome the challenge of insufficient (malicious) training data within the IoT realm, a generative adversarial network (GAN) based framework is also developed to identify known and unseen attacks on IoT devices. Finally, a software defined networking (SDN) based solution is proposed to mitigate threats from unsolicited IoT devices.

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Lloyd-Hart, Michael. „Novel techniques of wavefront sensing for adaptive optics with array telescopes using an artificial neural network“. Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185749.

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Atmospheric turbulence causes severe degradation of the resolving and signal-to-noise properties of present optical telescopes. Diffraction-limited resolution can be recovered through the use of a deformable ('adaptive') optical element to correct the atmospheric wavefront error. An adaptive optics system operating in the near infrared (1.7 - 3.5 μm) has been developed for use at the Multiple Mirror Telescope (MMT), an array of six co-mounted 1.8 m telescopes, in which six flat mirrors are used to correct the wavefront tilt across each aperture, and the phase differences between apertures. This can reduce the error sufficiently to achieve a diffraction-limited image with a central peak of 0.06 arcseconds full width at half maximum at 2.2 μm wavelength. A number of algorithms are used to drive the adaptive mirror in a closed servo loop, including a trained artificial neural network which deduces the wavefront aberration from a pair of simultaneous in- and out-of-focus images of a star, taken at the combined focal plane of the telescope. Computer simulations have shown that the net is capable of deriving the wavefront for the full six-mirror aperture, and in practice, the net has been demonstrated in the lab to maintain two- and three-aperture diffraction-limited beam profiles in the presence of distorting effects. On the sky, with a real star, the net has successfully restored the diffraction limit for two adjacent MMT segments. High resolution images have been obtained of various objects with a wide-field camera looking in the field around the wavefront reference star. Work has also been carried out to characterise the wavefront aberration at the MMT, which confirms the Kolmogorov model of turbulence. Finally, a new algorithm is discussed which shows great promise for correction of phase errors in array telescopes.

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Cores, Vitor Finotto. „Robô contínuo telescópico para tarefas em alturas elevadas“. Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-07082009-102547/.

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Observando-se as diversas aplicações de robôs na área de serviços é possível perceber uma crescente busca por manipulação de ferramentas em lugares elevados utilizando dispositivos robóticos, visto que tais tarefas exigem a utilização de diversos equipamentos de segurança e apresentam um alto risco à presença humana. Os exemplos mais comuns desse tipo de tarefa são: inspeção de: máquinas de grande porte, tanques de armazenamento, silos, postes, linhas de transmissão e distribuição de energia elétrica, etc. Com o intuito de aplicar robôs a essas tarefas, e consequentemente aumentar a segurança e eficiência dessas operações, foi realizado, primeiramente neste trabalho, um estudo sobre as classes de robôs manipuladores existentes. Para tanto adotou-se uma classificação que separa os robôs de acordo com o número de juntas, o que gera uma divisão em três diferentes grupos, robôs discretos, robôs do tipo serpente e robôs contínuos. Ao analisar as três classes, observa-se que os robôs contínuos possuem mais graus de liberdade que os outros grupos, apresentando como estrutura uma coluna vertebral continuamente deformável, que em oposição aos tradicionais manipuladores robóticos elo/junta/elo, possuem mecanismos mais simplificados, controle menos complexo devido ao menor número de atuadores e podem interagir com obstáculos encontrados em seu ambiente sem criar grandes forças de contato. Ao utilizar configurações extrínsecas, ou seja, posicionando os atuadores fora da estrutura do robô, e transmitindo o movimento utilizando cabos, é possível construir robôs com alta isolação elétrica, o que é de grande utilidade para operações que envolvem tarefas nas proximidades de redes elétricas de alta tensão. Apesar das diversas vantagens, não foram encontradas na literatura aplicações de robôs contínuos na realização de tarefas em alturas elevadas. Levando em consideração as vantagens oferecidas pelos robôs contínuos, este trabalho propõe o estudo e a aplicação de um robô do tipo contínuo que possua uma arquitetura mais adequada para realizar trabalhos a alturas elevadas. Com o intuito de demonstrar as vantagens oferecidas por essa arquitetura, será realizado um estudo de caso no qual o objeto a ser inspecionado são as cruzetas de madeira em postes de distribuição de energia elétrica. Em uma segunda etapa, elabora-se o projeto mecânico do robô contínuo proposto, onde são detalhados os mecanismos propostos e são feitas simulações utilizando o método dos elementos finitos para analisar o comportamento da estrutura quando submetida a carregamentos. Em uma terceira etapa, adotando-se uma estratégia de controle seqüencial é elaborado o projeto de controle. Em uma ultima etapa, com o intuito de analisar o funcionamento do robô é construído um protótipo, com o qual são feitos os testes.
Among several applications of robots in the service field, it is possible to percept an increasing interest in manipulate tools in higher positions using automatic devices, due to the fact that such activities are high risked operations and demands the use of several safety equipments. The most common examples of this kind of activity are the inspection of machines, silos, electrical distribution poles, etc. With the aim of apply robots to these activities and increase the safety and efficiency in these operations, as a first step in this work is done the study of different kinds of manipulators. Adopting a classification based on the number of joints, it is possible to separate robots in three different classes: discrete robots, snake-like robots and continuum robots. By analyzing these classes, it is possible to say that continuum robots have more degrees of freedom than the robots of others groups; Compared with the classic discrete robots, continuum robots have simplified mechanisms, simpler control scheme due to the small number of actuators and, in the case of an obstacle, they can contour the obstacle without generating high contact forces. By positioning the actuators out of the robot structure and transferring the motion using cables, i.e., adopting an extrinsic actuation, it is possible to build continuum robots with high electric insulation that is important in applications in which the robot must work near of an electrical distribution network. Despite these advantages, no previous works concerning the use of continuum robots to work in higher positions were found in the literature. Considering the advantages offered by continuum robots, this work proposes a study and application of a continuum robot that uses a more suitable architecture to work in higher positions. Aiming to demonstrate the advantages provided by this architecture, It will be used a case study, in which, the object to be inspected is the wood cross-arms of an electrical poles used in the electrical distribution networks. In a second step, it is done the mechanical project of the robot, where the proposed mechanisms are explained and structural simulations using the finite element method are performed in order to analyze how the structure would react to loads. In a third step, by adopting a strategy of sequential control, it is done the control project. In the last step, with the aim of analyze the robot in practical situation, a prototype is built, which is used to perform the tests.

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Gostojić, Aleksandar. „Développement d'un télescope Comton avec un calorimètre imageur 3D pour l'astronomie gamma“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS136/document.

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La thèse porte sur le développement d’un petit prototype de télescope Compton pour l'astronomie gamma spatiale dans la gamme d’énergie du MeV (0.1-100 MeV). Nous avons étudié de nouveaux modules de détection destinés à l'imagerie Compton. Nous avons assemblé et testé deux détecteurs à scintillation, l'un avec un cristal de bromure de lanthane dopé au cérium (LaBr₃:Ce) et l'autre avec un cristal de bromure de cérium (CeBr₃). Les deux cristaux sont couplés à des photomultiplicateurs multi-anodes 64 voies sensibles à la position. Notre objectif est d’optimiser la résolution en énergie en même temps que la résolution en position du premier impact d'un rayon gamma incident dans le détecteur. Les deux informations sont vitales pour la reconstruction d'une image avec le prototype de télescope à partir de l’effet Compton. Nous avons développé un banc de test pour étudier expérimentalement les deux modules, avec une électronique de lecture et un système d'acquisition de données dédiés. Nous avons entrepris un étalonnage précis du dispositif et effectué de nombreuses mesures avec différentes sources radioactives. En outre, nous avons réalisé une simulation numérique détaillée de l'expérience avec le logiciel GEANT4 et effectué une étude paramétrique extensive pour modéliser au mieux la propagation des photons ultraviolet de scintillation et les propriétés optiques des surfaces à l'intérieur du détecteur. Nous avons alors développé une méthode originale de reconstruction de la position d’impact en 3D, en utilisant un réseau de neurones artificiels entrainé avec des données simulées. Nous présentons dans ce travail tous les résultats expérimentaux obtenus avec les deux modules, les résultats de la simulation GEANT4, ainsi que l'algorithme basé sur le réseau de neurones. En plus, nous donnons les premiers résultats sur l'imagerie Compton obtenus avec le prototype de télescope et les comparons avec des performances simulées. Enfin, nous concluons en donnant un aperçu des perspectives d'avenir pour l'imagerie gamma Compton et considérons une application possible en discutant d’un concept de télescope spatial semblable à notre prototype
The thesis aims to develop a small prototype of a Compton telescope for future space instrumentation for gamma-ray astronomy. Telescope’s main target is the MeV range (0.1-100MeV). We studied novel detector modules intended for Compton imaging. We assembled and tested 2 modules, one with a cerium-doped lanthanum(III) bromide (LaBr₃:Ce) crystal and the other with cerium(III) bromide (CeBr₃). Both modules are coupled to and read out by 64-channel multi-anode PMTs. Our goals are to obtain the best possible energy resolution and position resolution in 3D on the first impact of an incident gamma-ray within the detector. Both information are vital for successful reconstruction of a Compton image with the telescope prototype. We developed a test bench to experimentally study both modules and have utilized a customized readout electronics and data acquisition system. We conducted a precise calibration of the system and performed experimental runs utilizing different radioactive sources. Furthermore, we have written a detailed GEANT4 simulation of the experiment and performed an extensive parametric study on defining the surfaces and types of scintillation propagation within the scintillator. We utilized simulated data to train an Artificial Neural Network (ANN) algorithm to create a simplified 3D impact position reconstruction method and in addition developed an approximation routine to estimate the standard deviations for the method. We show all experimental results obtained by both modules, results from the GEANT4 simulation runs and from the ANN algorithm. In addition, we give the first results on Compton imaging with the telescope prototype and compare them with simulated performance. We analyzed and discussed the performance of the modules, specifically spectral and position reconstruction capabilities. We conclude by giving an overview of the future prospects for gamma-ray imaging and consider possible applications showing a concept of a space telescope based on our prototype

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Bücher zum Thema "Network telescope"

From Earth-bound to satellite: Telescopes, skills, and networks. Leiden: Brill, 2012.

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Kaufmann und Freedman. Global Telescope Netwk Wkb T/a Uni. W.H.Freeman & Co Ltd, 2002.

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I, Kibrick Robert, und Society of Photo-optical Instrumentation Engineers., Hrsg. Advanced global communications technologies for astronomy II: 22-23 August, 2002, Waikoloa, Hawaii, USA. Bellingham, Wash: SPIE, 2002.

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I, Kibrick Robert, Wallander Anders, Society of Photo-optical Instrumentation Engineers., European Southern Observatory und DFM Engineering, Hrsg. Advanced global communications technologies for astronomy: 31 March 2000, Munich, Germany. Bellingham, Wash: SPIE, 2000.

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Ezell, Margaret J. M. Creating Science: The Royal Society and the New Literatures of Science. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198183112.003.0011.

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An overview of the founding of the Royal Society of London and early members, including Robert Hooke, Isaac Newton, John Wilkins, Robert Boyle, and Henry Oldenburg, who first published the Philosophical Transactions. In addition to the creation and improvement of scientific instruments, including microscopes and telescopes, as recorded by their historian Thomas Sprat, the members of the Royal Society wished to create a language of science free from distorting images and metaphor and to base science on empirical experiments and direct observation. Although challenged by many for promoting an atheist understanding of the natural world, members such as Robert Boyle defended science as complementary with theology. The Society promoted publications and established networks of scientific correspondence to include members outside London and on the Continent.

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Poehler, Eric E. The Traffic Systems of Pompeii. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190614676.001.0001.

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The Traffic Systems of Pompeii is the first sustained examination of the evidence for a regulated circulation of wheeled traffic in the ancient world. The setting to this system is the six-hundred-year evolution of Pompeii’s street network, the focus of which telescopes from the city’s urban grid to the shape of the streets, the treatment of their surfaces, and finally the individual elements of construction—the curbstones, stepping stones, and guard stones—where the evidence for traffic was inscribed. Although ruts are the most evocative evidence of ancient traffic, it is the wearing patterns on the vertical faces of street features that permit the determination of the directions that ancient carts were traveling and undergird the argument for their systematic regulation. Distilled from over five hundred locations recording multiple categories of evidence, all wholly new to archaeology and unique to this research, this book reveals the basic rules of the road and at the same time opens larger historical questions. What does the existence of a traffic system mean for our understanding of ancient urbanism? What other social forces are uncovered in the search for it? To explore these questions, the traffic system at Pompeii is set in its broader contexts as one infrastructural and administrative artifact of the Roman empire, an epiphenomenon of a deeply urban culture.

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Buchteile zum Thema "Network telescope"

Park, Byeong-Gon, Andrew P. Gould, Chung-Uk Lee und Seung-Lee Kim. „Korea Microlensing Telescope Network“. In Handbook of Exoplanets, 1–20. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-30648-3_124-1.

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Park, Byeong-Gon, Andrew P. Gould, Chung-Uk Lee und Seung-Lee Kim. „Korea Microlensing Telescope Network“. In Handbook of Exoplanets, 1065–84. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-55333-7_124.

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Elliott, Ian. „Requirements of a Network Telescope“. In Advances in Helio- and Asteroseismology, 541–44. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-4009-3_104.

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Chatziadam, Panos, Ioannis G. Askoxylakis und Alexandros Fragkiadakis. „A Network Telescope for Early Warning Intrusion Detection“. In Lecture Notes in Computer Science, 11–22. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07620-1_2.

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Zhan, Zhenxin, Maochao Xu und Shouhuai Xu. „A Characterization of Cybersecurity Posture from Network Telescope Data“. In Trusted Systems, 105–26. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-27998-5_7.

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Le Malécot, Erwan, und Daisuke Inoue. „The Carna Botnet Through the Lens of a Network Telescope“. In Foundations and Practice of Security, 426–41. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05302-8_26.

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Jakovlev, Sergej, Miroslav Voznak, Kestutis Ruibys und Arunas Andziulis. „Predictive Control of Radio Telescope Using Multi-layer Perceptron Neural Network“. In Nostradamus 2013: Prediction, Modeling and Analysis of Complex Systems, 233–44. Heidelberg: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00542-3_24.

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Irwin, B., und J. P. van Riel. „Using InetVis to Evaluate Snort and Bro Scan Detection on a Network Telescope“. In VizSEC 2007, 255–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78243-8_17.

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Chernov, Vitaliy K., Alexander V. Ipatov, Vyacheslav V. Mardyshkin, Sergey I. Ivanov und Artem A. Roev. „Ultra-Wideband Feed for Radio Telescope of a New-Generation Radio Interferometric Network“. In Lecture Notes in Computer Science, 729–38. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23126-6_67.

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Pennypacker, Carl, Jon Aymon, Shawn Gordon, Robert Denny, Frederic Hessman, David Barnaby, Michel Boer et al. „Developing a Protocol and Implementing a Network for Ubiquitous Use of Telescopes over the Internet: Remote Telescope Mark-up Language — RTML“. In Astrophysics and Space Science Library, 97–112. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0253-0_10.

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Konferenzberichte zum Thema "Network telescope"

Pickles, A., W. Rosing, T. M. Brown, J. de Vera, M. Dubberley, B. Haldeman, S. Hausler et al. „LCOGT Telescope network capabilities“. In SPIE Astronomical Telescopes + Instrumentation, herausgegeben von Larry M. Stepp, Roberto Gilmozzi und Helen J. Hall. SPIE, 2010. http://dx.doi.org/10.1117/12.857923.

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Liu, ChenHuan, ShanShan Hao, QianKun Liu, CongXiao Bao und Xing Li. „IPv6-Network Telescope Network Traffic Overview“. In 2021 IEEE 11th International Conference on Electronics Information and Emergency Communication (ICEIEC). IEEE, 2021. http://dx.doi.org/10.1109/iceiec51955.2021.9463724.

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Allan, Alasdair, Karsten Bischoff, Martin Burgdorf, Brad Cavanagh, Damien Christian, Neil Clay, Rob Dickens et al. „Operating a heterogeneous telescope network“. In SPIE Astronomical Telescopes + Instrumentation, herausgegeben von David R. Silva und Rodger E. Doxsey. SPIE, 2006. http://dx.doi.org/10.1117/12.671247.

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Steele, Iain A., Tim Naylor, Alisdair Allan, Jason Etherton und C. J. Mottram. „eSTAR: a distributed telescope network“. In Astronomical Telescopes and Instrumentation, herausgegeben von Robert I. Kibrick. SPIE, 2002. http://dx.doi.org/10.1117/12.456601.

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Boven, Paul, Chantal van Tour, Jeroen Koelemeij, Rob Smets und Arpad Szomoru. „Dwingeloo Telescope has Fringes (Again)“. In 14th European VLBI Network Symposium & Users Meeting. Trieste, Italy: Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.344.0156.

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Park, Byeong-Gon, Seung-Lee Kim, Jae Woo Lee, Byeong-Cheol Lee, Chung-Uk Lee, Cheongho Han, Minjin Kim et al. „Korea Microlensing Telescope Network: science cases“. In SPIE Astronomical Telescopes + Instrumentation, herausgegeben von Larry M. Stepp, Roberto Gilmozzi und Helen J. Hall. SPIE, 2012. http://dx.doi.org/10.1117/12.925826.

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„Telescope Network Scheduling - Rationale and Formalisms“. In International Conference on Operations Research and Enterprise Systems. SciTePress - Science and and Technology Publications, 2013. http://dx.doi.org/10.5220/0004274203130317.

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Hannahoe, Ryan M., Robert E. Stencel, Steve Bisque und Mike Rice. „The Student Telescope Network (STN) experiment“. In International Symposium on Optical Science and Technology, herausgegeben von C. Bruce Johnson, Divyendu Sinha und Phillip A. Laplante. SPIE, 2003. http://dx.doi.org/10.1117/12.458061.

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Fish, Vincent. „New results from the Event Horizon Telescope“. In 11th European VLBI Network Symposium & Users Meeting. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.178.0056.

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„Small Network Telescope for Advanced Security Monitoring“. In The 19th European Conference on Cyber Warfare. ACPI, 2020. http://dx.doi.org/10.34190/ews.20.094.

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