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We study a secondary wireless operator's spectrum investment problem under spectrum supply uncertainty using prospect theory. In order to meet the demands of its users, the secondary operator can either sense for the unused spectrum in a licensed band, or lease spectrum from a spectrum owner. Sensing is usually cheaper than leasing, but the amount of(More)
Motivated by the recently launched 2CM data trading platform of China Mobile Hong Kong, we study the optimal user mobile data trading problem under the future demand uncertainty. We consider a brokerage-based market, where sellers and buyers propose their selling and buying prices and quantities to the trading platform, respectively. The platform acts as a(More)
In this paper, we study a virtual wireless operator's spectrum investment problem under spectrum supply uncertainty. To obtain enough spectrum resources to meet its customer demands, the virtual operator can either sense for the temporarily unused spectrum in a licensed band or lease spectrum from a spectrum owner. Sensing is usually cheaper than leasing,(More)
Motivated by the recently launched mobile data trading markets (e.g., China Mobile Hong Kong&#x2019;s 2nd exChange Market), in this paper, the mobile data trading problem is studied under future data demand <italic>uncertainty</italic>. A brokerage-based market is introduced, in which sellers and buyers propose their selling and buying quantities,(More)
In the conventional mobile data plans, the unused data will be cleared at the end of every period (e.g., month). To take advantage of customers' heterogeneous demands across different periods and to provide more flexible data service, some mobile data service providers (SP) have offered data plans with different lengths of period. In this paper, we consider(More)
OBJECTIVE To determine lignan content in the vine stem of Schisandra chinensis during 12 months and provide the scientific basis for the development and utilization of the resources. METHOD Analysis was carried out on an Eclipse XDB C18 column eluted with a mixture of methanol-acetonitrile-water (43: 28: 29) as the mobile phase. The flowrate was 1.0 mL x(More)
In the present study, a simple and rapid method was developed to prepare a novel kind of inner-porous floating beads. The beads were prepared by dripping the foam solution into CaCl(2) solution using disposable syringe needle, where the foam solution consisting numerous of microbubbles with poloxamer 188 as foaming agents, alginate as foaming stablizer.(More)
Based on variable nuclear and/or organellar DNA sequences among vastly divergent species as well as morphologically indistinguishable species, DNA barcoding is widely applicable in species identification, biodiversity studies, forensic analyses, and authentication of medicinal plants. The roots of Astragalus membranaceus and A. membranaceus var. mongholica(More)
To exploit users' heterogeneous data demands, several mobile network operators worldwide have launched the mobile data trading markets, where users can trade mobile data quota with each other. In this work, we aim to understand the users' optimal trading decisions and the operator's revenue maximizing strategy. We model the interactions between the mobile(More)
Use of machine vision of tissue to indoor orchid plant growth status monitoring for plant growth, the state information, to improve the intelligent room of tissue has the vital significance. With the price of LED decreases, within the tissue more and more using LED for light, can significantly improve the plant growth and quality, but so on plant monitoring(More)
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