Danhua Zhang

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— This paper considers joint schedule and resource allocation in downlink cooperative OFDMA systems with multiple sources, multiple relays and a single destination. Each user has individual QoS requirements and the relays operate in amplify-and-forward and half-duplex mode. We try to find optimal power allocation, relay selection and subcarrier assignment(More)
The fundamental limit of wireless communication is the tradeoff between efficiency and reliability. In order to improve system efficiency and reliability simultaneously, we have to create and explore new degrees of freedom. Multi-domain collaboration can be regarded as a systematic approach to solve this issue. From a broader and higher perspective,(More)
Hematopoietic stem cells (HSCs) are capable of giving rise to all blood cell lineages throughout adulthood, and the generation of engraftable HSCs from human pluripotent stem cells is a major goal for regenerative medicine. Here, we describe a functional genome-wide RNAi screen to identify genes required for the differentiation of embryonic stem cell (ESC)(More)
Traditional congestion control protocols assume that each link provides a fixed capacity, while it is not always the case in wireless networks which have shared and variable medium. In this paper, we incorporate variable link capacity as a function of resource allocated, and random-access interference model dependent on physical location, in addition to(More)
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