Chung Yuan Christian University

About: Chung Yuan Christian University is a education organization based out in Taoyuan City, Taiwan. It is known for research contribution in the topics: Membrane & Fuzzy logic. The organization has 9819 authors who have published 11623 publications receiving 213139 citations. The organization is also known as: Tiong-gôan-tāi-ha̍k & CYCU.

A quality-on-demand algorithm for wavelet-based compression of electrocardiogram signals

Abstract: For the compression of medical signals such as electrocardiogram (ECG), excellent reconstruction quality of a highly compressed signal can be obtained by using a wavelet-based approach. The most widely used objective quality criterion for the compressed ECG is called the percent of root-mean-square difference (PRD). In this paper, given a user-specified PRD, an algorithm is proposed to meet the PRD demand by searching for an appropriate bit rate in an automatic, smooth, and fast manner for the wavelet-based compression. The bit rate searching is modeled as a root-finding problem for a one-dimensional function, where an unknown rate-distortion curve represents the function and the desired rate is the root to be sought. A solution derived from root-finding methods in numerical analysis is proposed. The proposed solution is incorporated in a well-known wavelet-based coding strategy called set partitioning in hierarchical trees. ECG signals taken from the MIT/BIH database are tested, and excellent results in terms of convergence speed, quality variation, and coding performance are obtained.

Interpenetrated and polycatenated nets of Cd(II) coordination networks from mixed N,N′-dipyridyladipoamide and dicarboxylate ligands

Abstract: The synthesis, structures and properties of five Cd(II) coordination networks: [Cd(bpdc)(L1)]n [L1 = N,N′-di(4-pyridyl)adipoamide; H2bpdc = 4,4′-biphenyldicarboxylic acid], 1; {[Cd2(1,4-ndc)2(L1)2(H2O)]·H2O·2DMF}n (1,4-H2ndc = naphthalene-1,4-dicarboxylic acid), 2; {[Cd(OBA)(L1)]·2H2O}n [H2OBA = 4,4′-oxybis(benzoic acid)], 3; {[Cd(SDA)(L1)]·1.5H2O}n (H2SDA = 4,4′-sulfonyldibenzoic acid), 4; and {[Cd(1,4-ndc)(L2)(H2O)]·2H2O}n [L2 = N,N′-di(3-pyridyl)adipoamide], 5, are reported. Complexes 1 and 2 show the pcu and fsd topologies with 2- and 3-fold interpenetrating modes, respectively, and complex 4 exhibits a 2-fold 2D → 2D parallel interpenetration network containing a rotaxane-like motif. Complex 3 is a 1D → 2D polycatenane derived from the helical channels, and the 2D layers are further mutually interdigitated, whereas complex 5 is a 2D → 3D polycatenane based on the undulating sql sheets. These five complexes show different thermal and luminescent properties and the CO2 capture is preferable to N2 in the gas sorption for the desolvated product of 1.

Modification of Multiwall Carbon Nanotubes with Initiators and Macroinitiators of Atom Transfer Radical Polymerization

Abstract: Functionalization on carbon nanotube (CNT) was performed through the addition reaction between the initiators of atom transfer radical polymerization (ATRP) and CNT. The ATRP initiating groups transferred to the CNT surface with this reaction. The modified CNT then served as an ATRP macroinitiator for further modification. Both linear poly(styrene) and V-shaped poly(styrene-b-N-isopropylacrylamide) block copolymers were therefore covalently bound to the CNT surface. Characterization on the functionalized CNTs was performed with FTIR, Raman spectroscopy, and an X-ray photoelectron spectrophotometer (XPS). The functionalized CNTs exhibited good solubility in organic solvents. In addition, amphiphilic and temperature-responsive properties were observed with the CNTs functionalized with poly(styrene-b-N-isopropylacrylamide).