Wei-Shun Liao

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Many modern handheld devices are able to take and store media contents, but are usually equipped with small panels and poor player utilities. To achieve high quality playing performance, users often need to transfer media contents to external powerful devices with a series of cumbersome operations of connection setup and content transfer. In this paper, we(More)
Traditional Orthogonal frequency-division multiplexing channel realization methods need transformations of transmission symbols between time and frequency domains and therefore result in quite a high computational complexity. In this paper, a channel realization method only in the frequency domain is proposed to reduce the complexity of simulation. An(More)
The UPnP technology is widely employed to enable networked devices interconnected in home computing environments. The UPnP eventing protocol on top of HTTP over TCP performs in a unicast manner, however, suffering from scalability problem and performance degradation against highly frequent event notifications. This paper devises an efficient event multicast(More)
With the increasing demand of wireless multimedia services, the multimedia broadcast multicast service (MBMS) is an emerging technology which is adopted in new wireless communication standards to enhance multimedia data transmission. In an MBMS system, all the users subscribing to the service receive multimedia data via the broadcast channel from the base(More)
In this paper, we conceive an advanced small cells wireless network deployment framework within a managed space under shared spectrum access paradigm. We also conceive a complementary business model, referred to as neutral host micro operator (NH-<inline-formula> <tex-math notation="LaTeX">$\mu \text{O}$ </tex-math></inline-formula>), that leverages a(More)
Piezoelectric nanogenerators have been investigated to generate electricity from environmental vibrations due to their energy conversion capabilities. In this study, we demonstrate an optimal geometrical design of inertial vibration direct-current piezoelectric nanogenerators based on obliquely aligned InN nanowire (NW) arrays with an optimized oblique(More)
This study investigates the role of carrier concentration in semiconducting piezoelectric single-nanowire nanogenerators (SNWNGs) and piezotronic devices. Unintentionally doped and Si-doped GaN nanowire arrays with various carrier concentrations, ranging from 10(17) (unintentionally doped) to 10(19) cm(-3) (heavily doped), are synthesized. For SNWNGs, the(More)
Small cells deployment is one of the most significant long-term strategic policies of the mobile network operators. In heterogeneous networks (HetNets), small cells serve as offloading spots in the radio access network to offload macro users (MUs) and their associated traffic from congested macrocells. In this paper, we perform analytical analysis and(More)
With the advent of global warming and energy crises, developing nanomaterial technologies into various nanodevices for energy harvesting has attracted a lot of attentions recently. Of which, nanogenerators by taking advantage of piezoelectric properties of nanowires (NWs) such as wurtzite compound semiconductors of ZnO [1], GaN [2], InN [3] and CdSe [4] can(More)
This paper studies cooperative beamforming in multihop amplify-and-forward relay networks. We adopt a layer-by-layer approach, namely per-layer sum-rate maximization, to compute the beamforming weights employed by the relays at each layer. When there is only one receiving node at the adjacent downstream layer, the per-layer sum-rate maximization problem is(More)