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A high gain omnidirectional monopole antenna with a metamaterial cover is proposed in this paper. We show that under proper condition the energy radiated by a source embedded in a cylinder of metamaterial will be concentrated in a narrow cone in the horizontal plane and maintain its omni-directivity in the vertical plane. The ideas developed here are applied in the microwave domain to realize a high...
A new method to improve the gain of patch antenna with metamaterial composed of ring aperture lattice is presented. A comparison between the conventional patch antenna and the new metamaterial patch antenna is given. The experimental results show that this method is effective and metamaterial structure can realize congregating the radiation energy, so the gain of the antenna with metamaterial can...
The Decision-Making (DM) problem is investigated for Cooperative Multiple Target Attack in air combat. It is to search for a proper attack assignment of M friendly fighters, with multiple target attack capability, to N hostile fighters called targets to achieve an optimal missile-target attack effect. Thus, Missile-Target Assignment (MTA) is regarded as the main part of the DM problem and has to be...
In information retrieval, how to analyze correctly and express exactly user's information need is the key to improve the precision of information retrieval. This paper proposes a model called bound of information need based on an approximation space. The model can measure user's information need domain. The paper also introduces two kinds of bound models: bound with query and bound with no query....
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