Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Dynamic analysis of a tension leg platform for offshore wind turbines

Wang H-F., Fan Y-H., Liu Y

Journal of Power Technologies

2014

Vol. 94, nr 1

42--49

The design for floating offshore wind turbine tension leg platform (FOWT-TLP) is economic, feasible and less platform motion comparing other floating structure, especially in deep water. In this paper, introducing spar floating structure advantage into tension leg platform to propose a conceptualization floating offshore wind turbine tension leg platform (HIT-FOWT-TLP). Concrete ballast model is arranged in the bottom of the spoke bottom plane to be as permanent ballast and much water ballast can be considered in single column, which can adjust gravity center by water freely to obtain dynamic feature that we needs and easy to assemble comparing other concepts; spoke part are considered in dimension and mass. The new model is only 49% of NREL-TLP model’s displacement, in mass it is only 27% of NREL-TLP model. We compare the hydrodynamic characteristic parameters and the RAO value in same environmental situation with NREL-TLP model. The result shows that in roll, sway and pitch motion, the new model has better performance.

Reversible Steganography for BTC-compressed Images

Chang C-C., Lin C-Y., Fan Y-H.

Fundamenta Informaticae

2011

Vol. 109, nr 2

121-134

Reversible steganography becomes a popular hiding problem in recent years. A reversible steganographicmethod can reconstruct an original image without loss from the stego-image after extracting the embedded data. Unlike traditional reversible methods in which data is hidden in uncompressed images, we propose a reversible scheme for BTC (block truncation coding)- compressed images. The secret data embedded in the compressed image are more difficult to detect than in the uncompressed image. To achieve reversibility, the properties of side matching and BTCcompressed code are applied. The experimental results show that the proposed method is feasible for BTC-compressed images and can embed one more bit in each BTC-encoded block.