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Exponentially growing demand for mobile data is pushing the existing mobile networks to the limit. In addition to offloading traffic onto WiFi access points (APs), dual-band femtocells (DBFs) that can simultaneously access both the licensed and unlicensed bands have been proposed for cellular networks to further exploit the unlicensed spectrum. However, the coexistence between DBFs and WiFi in the...
Displacement amplification ratio and input stiffness are significant design characteristics for an ultra-precision positioning flexure-based compliant mechanism. Early and accurate performance prediction models can significantly improve the reliability and availability of product in the field of ultra-precision positioning, but Existing theoretic models cannot predict its characteristics accurately...
Large-scale helicopter group is an important part of the Airdrop Assault System of Systems (AASoS). How to plan the scale of helicopter group and achieve the best operational effectiveness is a focus of the AASoS capability requirement analysis. Based on the macro-micro characteristic of the system of systems and the individual system, airdrop assault combat models are divided into three types separately...
Methods used to gain executable architecture are all based on transforming view models to executable models, which can not take the advantage of “data-centric” approach adopted by DoDAF2.0. A novel executable architecting approach transforming DoDAF Meta-model (DM2) to executable model directly is proposed, which can overcame the limitation of traditional approaches that information consistency and...
A data-centric executable modeling approach is proposed for system-of-Systems (SoS) architecture by taking full advantage of the Department of Defense Architecture Framework (DoDAF) Meta-model (DM2), which provides more flexibility and adaptability to the automated construction of executable models directly from the architectural data. Firstly, the architectural data meta-model is established to guide...
Performance Index is the foundational and essential indices of measurement of SoS(System of Systems) capability. We propose ten sorts of mapping relationships description between kernel elements of SoS architecture based on the DSM/DMM model. The formalization of model transformation, combination and transposing operators are described as the foundation of proposition of formulation to measure the...
The paper presented the fundamental of HHT and Fourier transformation through elaborating the theory and simulation experiments on matlab. Giving specific signal, the two transformations were used in application of partial discharge, voltage dip, and harmonic wave. Visualized spectrogram were obtained to compare the two transformations from each other, therefore, HHT and Fourier transformation can...
A virtual team is different from a traditional team, and it lays emphasis on trans-time, -space and -organization-boundary, which makes the trust between individuals become a challenge to enhance performance and achievement of a team. It has long been a hard issue for the virtual team researchers to set up a trust system. After systematically analyzing the intrinsic meaning and concept model of the...
Human reliability analysis in complicated industrial processes is facing to difficulties, such as insufficient knowledge utilization and simplex analytic means etc. This paper first introduces basic meanings and current research situation of human reliability analysis and qualitative simulation respectively, and then on the basis of it, considering current insufficiency of human reliability analysis...
In this paper, we report our experimental and numerical results, confirming the phenomenon of dual in-phase reflection, i.e. dual-resonant behavior, for a TM-polarization plane wave oblique incidence on the conventional mushroom-like EBG structures. A modified local resonance cavity (MLRCC) model of EBG structures has been presented to explain the essential features of dual- resonant behavior and...
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