Sökning: "Lei Lei"

Visar resultat 1 - 5 av 68 avhandlingar innehållade orden Lei Lei.

  1. 1. From Orthogonal to Non-orthogonal Multiple Access : Energy- and Spectrum-Efficient Resource Allocation

    Författare :Lei Lei; Di Yuan; Angelakis Angelakis; Erik Bergfeldt; Xiaoli Chu; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The rapid pace of innovations in information and communication technology (ICT) industry over the past decade has greatly improved people’s mobile communication experience. This, in turn, has escalated exponential growth in the number of connected mobile devices and data traffic volume in wireless networks. LÄS MER

  3. 2. Radio Resource Optimization for OFDM-based Broadband Cellular Systems

    Författare :Lei Lei; Di Yuan; Michael Reyer; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : The rapid growth of users’ traffic demand in broadband wireless communication systems requires high-speed data transmission and intelligent resource allocation approaches. The Third Generation Partnership Project-Long Term Evolution (3GPPLTE) has standardized multiple access (MA) schemes for 4G cellular networks. LÄS MER

  4. 3. Experimental Studies of Separated Flow and Heat Transfer in a Ribbed Channel

    Författare :Lei Wang; Värmeöverföring; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energiforskning; plasma; Energy research; fluiddynamik; Gaser; fluid dynamics; plasmas; Gases; Particle image velocimetry; Liquid crystal thermography; ribbed channel; heat transfer; turbulence properties; separated flow; coherent structures;

    Sammanfattning : The main concern of this thesis is to experimentally investigate the turbulent flow and heat transfer in a ribbed channel. Such flows are encountered in many engineering applications, e.g., gas turbine cooling. LÄS MER

  5. 4. Immunomodulation and immunopathogenesis in autoimmune disease with emphasis on autoimmune neuritis and arthritis

    Författare :Lei Bao; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Experimental autoimmune neuritis (EAN) and arthritis are CD4+ T cell mediated autoimmune animal models for the study of immunomodulation and immunopathogenesis of human Guillain-Barré syndrome (GBS) and rheumatoid arthritis (RA). Inflammatory cell infiltration and cytokine production in the target organs are characteristic features of both diseases, suggesting a role of cytokine production in the pathogenesis. LÄS MER

  7. 5. Receptor Upregulation and MAPK Activity in Arteries and Bronchi Following Secondhand Smoke Exposure

    Författare :Lei Cao; Lund Medicin; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; coronary arteries; cerebral arteries; 5-hydroxytryptamine receptor; endothelin receptor; secondhand smoke exposure; bronchi;

    Sammanfattning : Cigarette smoking is a major risk factor for cardiovascular and respiratory diseases. Contractile receptor changes have been observed in several vascular diseases. The intracellular mitogen activated protein kinase (MAPK) signaling pathways are suggested to be associated with receptor upregulation. LÄS MER