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  1. AU="Achim Hagen"
  2. AU="Ambade, Preshit Nemdas"
  3. AU="Sarmah, Deepraj"
  4. AU="Little, James W."
  5. AU="Templin, Zoe"
  6. AU="Levick, Samantha"
  7. AU="Tatakis, Fotis"
  8. AU="de Vries, Florentine R"
  9. AU="Tsai, Y-T" AU="Tsai, Y-T"
  10. AU="Gonakoti, Sriram"
  11. AU="Wulf, J"
  12. AU="Mardsen, D"
  13. AU="James, David B A"
  14. AU="Montabone, Erika"
  15. AU="Susan J. Burke"
  16. AU="Chen, Yuguang"
  17. AU="Zhao, Zhenghuan"
  18. AU="De Chiara, Anna Rosaria"
  19. AU="Savage, Anne"
  20. AU="Salamanca, Albert"
  21. AU="Zhong, Xiao-Song"
  22. AU="Deguchi, Masashi"
  23. AU="Żmuda, J"
  24. AU="Liao, Yanyan"
  25. AU="Zhu, Jin-Wei"
  26. AU="Khan, Azkia"
  27. AU="Folkman, Judah"
  28. AU=Bhatia Rajesh
  29. AU="Thobois, Stéphane"
  30. AU="Lai, Chien-Chih"
  31. AU="Ahn, Bo Young"
  32. AU="Jeje, Olamide"
  33. AU="Fine, Samson W"
  34. AU="Riemann, Burkhard"
  35. AU="Nazir, Ahsan"
  36. AU="Kawakita, Emi"
  37. AU="Wang, Junnian"
  38. AU="Nie, Chong"

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  1. Artikel ; Online: The Two-Stage Game Approach to Coalition Formation

    Achim Hagen / Pierre von Mouche / Hans-Peter Weikard

    Games, Vol 11, Iss 1, p

    Where We Stand and Ways to Go

    2020  Band 3

    Abstract: Coalition formation is often analysed in an almost non-cooperative way, as a two-stage game that consists of a first stage comprising membership actions and a second stage with physical actions, such as the provision of a public good. We formalised this ... ...

    Abstract Coalition formation is often analysed in an almost non-cooperative way, as a two-stage game that consists of a first stage comprising membership actions and a second stage with physical actions, such as the provision of a public good. We formalised this widely used approach for the case where actions are simultaneous in each stage. Herein, we give special attention to the case of a symmetric physical game. Various theoretical results, in particular, for cartel games, are provided. As they are crucial, recent results on the uniqueness of coalitional equilibria of Cournot-like physical games are reconsidered. Various concrete examples are included. Finally, we discuss research strategies to obtain results about equilibrium coalition structures with abstract physical games in terms of qualitative properties of their primitives.
    Schlagwörter binary action game ; cartel game ; cournot-like game ; coalition formation ; equilibrium coalition structure ; potential game ; symmetric game ; two-stage game ; Technology ; T ; Social Sciences ; H
    Thema/Rubrik (Code) 330
    Sprache Englisch
    Erscheinungsdatum 2020-01-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel ; Online: Impact of CT Photon-Counting Virtual Monoenergetic Imaging on Visualization of Abdominal Arterial Vessels

    Daniel Dillinger / Daniel Overhoff / Christian Booz / Hanns L. Kaatsch / Joel Piechotka / Achim Hagen / Matthias F. Froelich / Thomas J. Vogl / Stephan Waldeck

    Diagnostics, Vol 13, Iss 938, p

    2023  Band 938

    Abstract: Purpose: The novel photon-counting detector (PCD) technique acquires spectral data for virtual monoenergetic imaging (VMI) in every examination. The aim of this study was the evaluation of the impact of VMI of abdominal arterial vessels on quantitative ... ...

    Abstract Purpose: The novel photon-counting detector (PCD) technique acquires spectral data for virtual monoenergetic imaging (VMI) in every examination. The aim of this study was the evaluation of the impact of VMI of abdominal arterial vessels on quantitative and qualitative subjective image parameters. Methods: A total of 20 patients that underwent an arterial phase computed tomography (CT) scan of the abdomen with a novel PCD CT (Siemens NAEOTOM alpha) were analyzed regarding attenuation at different energy levels in virtual monoenergetic imaging. Contrast-to-noise ratio (CNR) and signal-to-noise ratio (SNR) were calculated and compared between the different virtual monoenergetic (VME) levels with correlation to vessel diameter. In addition, subjective image parameters (overall subjective image quality, subjective image noise and vessel contrast) were evaluated. Results: Our research showed decreasing attenuation levels with increasing energy levels in virtual monoenergetic imaging regardless of vessel diameter. CNR showed best overall results at 60 keV, and SNR at 70 keV with no significant difference to 60 keV ( p = 0.294). Subjective image quality was rated best at 70 keV for overall image quality, vessel contrast and noise. Conclusions: Our data suggest that VMI at 60–70 keV provides the best objective and subjective image quality concerning vessel contrast irrespective of vessel size.
    Schlagwörter computed tomography ; computed tomography angiography ; virtual monoenergetic imaging ; contrast-to-noise ratio ; signal-to-noise ratio ; Medicine (General) ; R5-920
    Thema/Rubrik (Code) 616
    Sprache Englisch
    Erscheinungsdatum 2023-03-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

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    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

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