Browsing by Author "Sung, CH"

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Design and implementation of a scalable fast Fourier transform core
(2002)
Sung, CH
;
Lee, KB
;
Jen, CW
;
電機學院
;
College of Electrical and Computer Engineering
A novel approach for scalable length Fast Fourier Transform (FFT) in single Processing Element (single PE) architecture has been developed. Scalable length FFT design meets the different lengths requirement of FFT operation in OFDM system [1]. An efficient mechanism that named Interleaved Rotated Data Allocation (IRDA) to replace multiple-port memory with single-port memory has also been proposed. Using single-port memory instead of multiple-port memory makes more area efficient.
Induced twisting in the self-assembly of chiral Schiff-based rod-coil amphiphiles
(2006-01-24)
Sung, CH
;
Kung, LR
;
Hsu, CS
;
Lin, TF
;
Ho, RM
A series of novel organic superstructures exhibiting diverse aggregate morphologies with liquid-crystalline-like properties were prepared by a simple precipitation method. Here, a chiral sugar moiety was simply introduced at the Schiff-based rod end of rod-coil molecules. In contrast to coil-coil molecules, the self-assembled rod-coil molecules exhibit a high segregation strength for phase separation because of their liquid-crystalline-like behavior. The morphological transformation of self-assembled chiral Schiff-based rod-coil amphiphiles, from a platelet-like morphology to helical twists, was obtained by increasing the length of the hydrophobic tail. Consistent with theoretical predictions, the bending force from the chiral entity depends on the size of the adjacent hydrophobic tail. That is, the size of hydrophobic chain determines the threshold of bending for the formation of a helical morphology. Moreover, by introducing an additional tethered hydrophobic chain self-assembled spherical vesicles can be obtained through the collapse of the twisted shape.