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  • 1
    UID:
    (DE-101)989561380
    Format: V, 150, [9] Bl. , Ill., graph. Darst. , 30 cm
    Note: Halle (Saale), Univ., Diss., 2008
    Language: German
    Keywords: Hochschulschrift
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  • 2
    UID:
    (DE-627)1616996110
    Format: V, 150 Bl. , Ill., graph. Darst.
    Note: Halle-Wittenberg Univ. Diss. 2007
    Language: German
    Keywords: Hochschulschrift
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  • 3
    UID:
    (DE-627)560483449
    Format: V, 150 Bl. , graph. Darst., Ill.
    Note: Halle, Univ.,Nat. Fak. I, Diss., 2008
    Language: German
    Keywords: Hochschulschrift
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  • 4
    UID:
    (DE-627)837726115
    Format: Online-Ressource
    Content: Zusammenfassung: All over the globe there is a tendency towards using more and more small electronic devices to coordinate and support our daily lives. The standard way of communication of these autonomous units is wireless, i.e., broadcasted signals can be received by all devices within reach. Whether a receiving device can actually decode a signal by another device does, however, depends on a variety of factors other than the distance and the signal strength. Among them, environmental interference—either stemming from other sending devices or simply white noise—is the most significant one.In this thesis we investigate how such devices can work together in a distributed manner to compute basic hierarchical structures among themselves based on the restrictions imposed by constrained communication such as wireless signaling.The radio network model tries to capture above mentioned dependencies. It pessimistically assumes that signals can only be decoded if there is no interference, while in every other case signals received under collisions are indistinguishable from silence or white noise. Lots of research has been done for this model, but it is commonly assumed that only one channel for communication is available, while in reality a broad spectrum of frequencies can be exploited.The main theme of this thesis is to study multiple important ad hoc structure-building problems for the radio network model, under the assumption that a multitude of communication channels is available. It is analyzed which benefits can be reaped in such an environment, and where multichannel networks have their limitations. The main problems we study are leader election, wake-up, minimum dominating set, maximal independent set and connected dominating set. If we denote with n the size of the network and with F the number of communication channels, then for all the above mentioned problems we can show a speed-gain roughly in the order of min{F, log n} compared to prevailing single channel algorithms.While the radio network model is pessimistic in its assumptions and therefore a good model for developing robust algorithms, some desired physical properties that are actually prevalent in wireless communication are not reflected in it. However, this is the case for the signal-to-interference-and-noise-ratio model (SINR), which in return is harder to analyze. In addition, while this model has been analyzed a lot from a central perspective, the theory for distributed algorithms in th ...
    Note: Freiburg i. Br., Univ., Diss., 2015
    Additional Edition: Druckausg. Daum, Sebastian, 1981 - The power of frequency hopping and information dissemination in constrained communication models 2015
    Additional Edition: Druckausg.: Daum, Sebastian: The power of frequency hopping and information dissemination in constrained communication models
    Language: English
    Keywords: Ad-hoc-Netz ; Funknetz ; Hochschulschrift
    URL: Volltext  (kostenfrei)
    URL: Volltext  (kostenfrei)
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  • 5
    UID:
    (DE-627)1516668383
    Format: IV, 189 S. , graph. Darst.
    Note: Auch online unter http://www.freidok.uni-freiburg.de , Freiburg i. Br., Univ., Diss., 2015
    Additional Edition: Online-Ausg. Daum, Sebastian, 1981 - The power of frequency hopping and information dissemination in constrained communication models 2015
    Language: English
    Keywords: Ad-hoc-Netz ; Funknetz ; Hochschulschrift
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  • 6
    Online Resource
    Online Resource
    Genf : SwissLex | Zürich/St. Gallen : Dike Verlag AG
    UID:
    (DE-627)1834915856
    Format: 1 Online-Ressource
    ISBN: 9783037518496
    Language: English
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  • 7
    UID:
    (DE-603)396770231
    Format: Online-Ressource
    Content: Zusammenfassung: All over the globe there is a tendency towards using more and more small electronic devices to coordinate and support our daily lives. The standard way of communication of these autonomous units is wireless, i.e., broadcasted signals can be received by all devices within reach. Whether a receiving device can actually decode a signal by another device does, however, depends on a variety of factors other than the distance and the signal strength. Among them, environmental interference—either stemming from other sending devices or simply white noise—is the most significant one.In this thesis we investigate how such devices can work together in a distributed manner to compute basic hierarchical structures among themselves based on the restrictions imposed by constrained communication such as wireless signaling.The radio network model tries to capture above mentioned dependencies. It pessimistically assumes that signals can only be decoded if there is no interference, while in every other case signals received under collisions are indistinguishable from silence or white noise. Lots of research has been done for this model, but it is commonly assumed that only one channel for communication is available, while in reality a broad spectrum of frequencies can be exploited.The main theme of this thesis is to study multiple important ad hoc structure-building problems for the radio network model, under the assumption that a multitude of communication channels is available. It is analyzed which benefits can be reaped in such an environment, and where multichannel networks have their limitations. The main problems we study are leader election, wake-up, minimum dominating set, maximal independent set and connected dominating set. If we denote with n the size of the network and with F the number of communication channels, then for all the above mentioned problems we can show a speed-gain roughly in the order of minF, log n} compared to prevailing single channel algorithms.While the radio network model is pessimistic in its assumptions and therefore a good model for developing robust algorithms, some desired physical properties that are actually prevalent in wireless communication are not reflected in it. However, this is the case for the signal-to-interference-and-noise-ratio model (SINR), which in return is harder to analyze. In addition, while this model has been analyzed a lot from a central perspective, the theory for distributed algorithms in this area is not as well developed as the radio network model. For these two reasons we drop the multichannel aspect and study possibilities and limitations for the core problem of information dissemination in the ad hoc SINR model.At last we turn our focus to another network that works on a peer-to-peer basis, i.e., in a wired network. We introduce a new constrained variant for gossip communication models, trying to close the gap between prevalent theory and reality. In this model we investigate again the possibilities and limitations for disseminating information
    Note: Dissertation Albert-Ludwigs-Universität Freiburg 2015
    Language: English
    Library Location Call Number Volume/Issue/Year Availability
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  • 8
    UID:
    (DE-101)1119247276
    Format: Online-Ressource
    Content: Zusammenfassung: All over the globe there is a tendency towards using more and more small electronic devices to coordinate and support our daily lives. The standard way of communication of these autonomous units is wireless, i.e., broadcasted signals can be received by all devices within reach. Whether a receiving device can actually decode a signal by another device does, however, depends on a variety of factors other than the distance and the signal strength. Among them, environmental interference—either stemming from other sending devices or simply white noise—is the most significant one.In this thesis we investigate how such devices can work together in a distributed manner to compute basic hierarchical structures among themselves based on the restrictions imposed by constrained communication such as wireless signaling.The radio network model tries to capture above mentioned dependencies. It pessimistically assumes that signals can only be decoded if there is no interference, while in every other case signals received under collisions are indistinguishable from silence or white noise. Lots of research has been done for this model, but it is commonly assumed that only one channel for communication is available, while in reality a broad spectrum of frequencies can be exploited.The main theme of this thesis is to study multiple important ad hoc structure-building problems for the radio network model, under the assumption that a multitude of communication channels is available. It is analyzed which benefits can be reaped in such an environment, and where multichannel networks have their limitations. The main problems we study are leader election, wake-up, minimum dominating set, maximal independent set and connected dominating set. If we denote with n the size of the network and with F the number of communication channels, then for all the above mentioned problems we can show a speed-gain roughly in the order of min{F, log n} compared to prevailing single channel algorithms.While the radio network model is pessimistic in its assumptions and therefore a good model for developing robust algorithms, some desired physical properties that are actually prevalent in wireless communication are not reflected in it. However, this is the case for the signal-to-interference-and-noise-ratio model (SINR), which in return is harder to analyze. In addition, while this model has been analyzed a lot from a central perspective, the theory for distributed algorithms in this area is not as well developed as the radio network model. For these two reasons we drop the multichannel aspect and study possibilities and limitations for the core problem of information dissemination in the ad hoc SINR model.At last we turn our focus to another network that works on a peer-to-peer basis, i.e., in a wired network. We introduce a new constrained variant for gossip communication models, trying to close the gap between prevalent theory and reality. In this model we investigate again the possibilities and limitations for disseminating information
    Note: Dissertation Albert-Ludwigs-Universität Freiburg 2015
    Language: English
    Keywords: Hochschulschrift
    Library Location Call Number Volume/Issue/Year Availability
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  • 9
    UID:
    (DE-627)1737195968
    Format: 125 Seiten , Illustrationen , 23 cm
    ISBN: 9783037518496
    Series Statement: CFAC - the aviation series volume 10
    Note: Includes bibliographical references (pages 69-85)
    Language: English
    URL: Inhaltsverzeichnis  (kostenfrei)
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  • 10
    UID:
    (DE-627)1886724415
    Format: 1 e.Br.m.S.
    Series Statement: Nachlass Christian Daum (1612-1687)
    Note: Eingangsdatum: 14.08.1671
    In: year:1671
    Language: Latin
    Keywords: Handschrift
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