Cheng Han Wu

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This paper proposes a new application framework for group tour guiding services based on RFIDs and wireless sensor network. We consider a sensing field mixed with multiple independent tourist groups, each with a leader and several members. Members of a group will follow the moving path of their leader, but may occasionally roam around randomly based on(More)
Recovery of rare aquatic plant species in eutrophic lakes often fails, and mutual allelopathic effects between cyanobacteria and submerged macrophytes are one potential reason. In this study, we investigated allelopathic interactions between cyanobacteria and Ottelia acuminata, an endangered submerged macrophyte species in China. We tested effects of(More)
I. Supplementary figures There are a total of five supplementary figures. The  abs data in the dry and rainy seasons are summarized in Figure S1. Diurnal variations of  abs are shown in Figure S2. Figure S3 shows the weather chart for an example of tropical storm activity on May 17, 2008. Figure S4 shows the histogram of Angstrom Absorption Exponent (AAE)(More)
Equity-index volatility and variance swaps offer an efficient way for traders to take synthetic positions in pure volatility. General pricing method for volatility and variance swaps uses the replication method in Demeterfi, Derman, Kamal, and Zou (1999). In this thesis, we try to use the more direct and intuitive way to price volatility and variance swaps.(More)
The purpose of this paper is to analyze the feasibility of applying wavelet density estimation to ICA algorithm in theory. We propose a novel ICA algorithm based on wavelet density estimation in this paper. The density estimation of the separated signals is directly evaluated by truncated wavelet to approximate the arbitrary density function of sources so(More)
The two-dimensional (2-D) harmonic retrieval method in multiplicative and additive noise based on 2-D chirp z-transform (CZT) is discussed in this paper. Unlike 2-D FFT, the 2-D CZT can improve the spectral resolution without increasing the size of the observation data and fine the spectra of 2-D harmonics in multiplicative and additive noise. Hence, the(More)
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