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The standard time/frequency signal from the time keeping laboratories is produced and maintained mainly by commercial hydrogen masers and cesium clocks. The former has excellent short-term stability and good low noise characteristics, but with frequency drift significantly, their long-term stability will be decreased with time gradually. So using a hydrogen maser as the UTC (k) frequency source, it...
Through analyzing the demands of the timescale stability for small or medium-size time laboratory, it is researched that the relationship between different allocation of clock set and stability of time scale with the data of atomic clock 5071A, which is mainly used atomic clock for time keeping at present, released by the Bureau International des Poids et Mesures; Weight is one of the keys to atomic...
It is well known that a signal of atomic clock is effected by various noises. In order to obtain the high precision time scale, it is important and necessary to filter or weaken the noises from the atomic clock's signal. The smooth processing of the atomic clock signal may be realized by Hilbert-Huang transform. With empirical mode decomposition method, a clock's signal is decomposed into single component...
More and more data in practice is changing every minute and been collected in incremental mode, and incremental clustering has attracted much of researchers' attention. However, little research now focuses on partitioning categorical data in incremental mode. How to design incremental clustering for categorical data is an urgent problem. We propose an incremental clustering for categorical data using...
Hydrogen masers and cesium clocks are two important kinds of precision frequency standard, and each of them has its own advantages in time keeping. It is important to investigate the way for effectively combining these two kinds of cocks in order to form a better atomic time scale. There are four hydrogen masers and eighteen Hp5071A cesium clocks at NTSC (National Time Service Center, the Chinese...
In this paper we present the use of game theoretic models to analyze the cost allocation problem in the supply chain coordination. Three game theoretic models are discussed; they are the core, the nucleolus and the Shapley value. We consider how to allocate the cost creating from the supply chain coordination, and the allocation is required to be fair in a certain sense. First, we give the definition...
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