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This paper analyzes the influences of displacement sensor noise on the power amplifiers of active magnetic bearing systems in both current and voltage control schemes. An effective evaluation index has been proposed to guarantee that the comparison is meaningful and fair enough to both control schemes. In addition, an appropriate controller is designed for each control scheme, while each controller...
In order to assess and improve the reliability of wind turbine generators (WTG), and to optimize the maintenance strategy, it is necessary to use online monitoring data acquired from supervisory control and data acquisition (SCADA) system to assess the real-time operational conditions of WTG. Because the determination of fuzzy membership function is subjective and fails to take randomness into account...
We demonstrate a microfiber FP sensor that is manufactured directly in the micro-size fiber by the use of a 193nm-excimer-laser exposure. The spectral characteristics and the wavelength dependency on the external strain, temperature, and refractive index are investigated. The research results are useful for future applications of the devices.
In this paper, we demonstrate high-efficiency inscription of Bragg gratings in microfiber. Strong Bragg gratings are easily inscribed using a 193-nm excimer laser and phase mask in microfiber drawn from the 62.5/125- standard multimode fiber (MMF) with no additional photosensitization treatment. The enlarged photosensitive core offered by the MMF provides a sufficient overlap between the...
The next generation digital video broadcasting network of China will aim at connections of regional metropolises, which introduces problems of content protection among operators. So it is crucial to solve the problem of stream media services for encrypted programs. This paper proposes a time-shifted TV scheme for encrypted DVB programs, in which linear adaptive prediction model is adopted. Suitable...
Caching can improve the browser's efficiency, this paper proposes one distributed sharing model of the browser cache: each end-host's address and the Web site URL address are mapped to the identical key space, the storing information of the shared cache mapped to key k is saved on the same key k mapped end-host; it also presents a distributed lookup protocol with a constant O(1) hop per lookup request,...
The severe restriction of topographic factors, etc. the layout of the valley-city development along with the topography, so that the site selection of passenger station in the valley-city is different from that of the plain-city. The principles of the layout and site selection of passenger station is described in this paper, the ANP method is introduced into the site selection of passenger station...
Workflows are widely used for representing business processes, Web services, scientific experiments, and activities in daily life, like recipes. There is an increasing need for people to search a workflow repository using keywords and retrieve the relevant ones according to their interests. A workflow hierarchy is a three dimensional object containing multi-resolution abstraction views on the same...
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