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Extracting urban land of China timely and accurately is essential for recognizing and understanding the urban pattern and urbanization process in China. Stable nighttime light data obtained by the Defense Meteorological Satellite Program/Operational Linescan System (DMSP/OLS) provides an economical and straightforward way to map the distribution of urban land. However, all the current methods of extracting...
The demand and the satisfaction of the reader are a service and creative system that is circuitous. So this paper attempts to construct a synthetic evaluation model of reader satisfaction in virtue of the relevant theory of the management psychology and the fuzzy math, and we have made a practical research and analysis on one university library with this model.
Considering the multiplicity mT(??) of eigenvalue ?? (which equals 1) of Laplacian matrix of all trees, we get three results: When mT(1) equals n-2, the tree is unique, that is star graph K1, n-1; (ii) there exists no trees satisfying mT(1) equals n-3; (iii) When mT(1) equals n-4, this kind of trees are divided into two types. According to the process of proving, we devise a method to construct trees...
We report our investigation on low-temperature-grown GaAs THz photomixers using two different kind of antennas: silicon lens coupled spiral antenna and transverse electromagnetic horn antenna. We demonstrate that the horn radiates more power than the spiral above 600 GHz and at 2 THz the improvement is about a decade.
Thermally stimulated current (TSC) is developed and a new method for direct determination of trap level distribution in polymer film is proposed. In this method, a new function is defined to weight the contribution of a trap level to the current at any temperature. The demarcation energy is used to study the trap empty process. Analysis shows that only electrons with trap levels very close to the...
Key technologies of disaster tolerant intelligent network are briefly introduced at first. After the hot-standby disaster tolerant IN architecture is analyzed, a load-sharing mode is proposed which has no downtime during switchover. By constructing the availability models of local clustered subsystem and the load-sharing disaster tolerant IN system based on birth-death process, it is proved that the...
The BA model and BA extend model described the number of nodes linked, but they are believe the nodes have the highest number of links if the timeframe is enough long. However, the real system not only depend on timeframe, hence, we proposed a new network evolving model which has attractive factor, the number of links of nodes have relate with attractive factor. If new nodes have enough attractive...
Hotspots could degrade the performance of peer-to-peer (P2P) systems and add vulnerability to the system. This paper researches into the hotspots in P2P network, and present a new method to avoid generating the hotspots in the network by controlling the logical topology structure of P2P network. We firstly introduce the controlling ideas about seeking for spare nodes of the hotspots and distributing...
In practice, it is difficult to gain profit in the process of trading interest rate derivative commodities. This could be attributed to the complexity of existing pricing models, which are derived from the term structure and yield curve, both of which cannot adapt well to short-term market dynamics. In this study, we use the Extended Classifier System (XCS) to model the market behavior of interest...
The concept of multiple-input multiple-output (MIMO) radars has drawn considerable attention recently. Unlike the traditional single-input multiple-output (SIMO) radar which emits coherent waveforms to form a focused beam, the MIMO radar can transmit orthogonal (or incoherent) waveforms. These waveforms can be used to increase the system spatial resolution. The waveforms also affect the range and...
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