Browsing by Author "Wang, JJ"

Now showing 1 - 9 of 9

1-fault tolerant design for token rings
(1998)
Wang, JJ
;
Hung, CN
;
Hsu, LH
;
資訊工程學系
;
Department of Computer Science
In this paper, we present a family of 3-regular, planar, and hamiltonian graphs. Any graph in this family remains hamiltonian if any node or any edge is deleted. Moreover, the diameter of any graph in this family is O(root p) where p is the number of nodes.
A content-based motion estimation algorithm for power-aware architecture
(2003)
Cheng, HW
;
Dung, LR
;
Yen, JH
;
Wang, JJ
;
電控工程研究所
This paper presents a novel power-aware architecture, called the vario-power architecture, for motion estimation. Based on the proposed content-based subsample algorithm, the architecture can operate at different power consumption modes with little quality degradation and the switching of power mode can be done dynamically. As shown in the simulation results, the power consumption can be significantly reduced by simply change the threshold parameters while the quality degradations are little.
A family of trivalent 1-hamiltonian graphs with diameter O(log n)
(2001-07-01)
Wang, JJ
;
Sung, TY
;
Hsu, LH
;
資訊工程學系
;
Department of Computer Science
In this paper, we construct a family of graphs denoted by Eye(s) that are 3-regular, 3-connected, planar, hamiltonian, edge hamiltonian, and also minimal 1-hamiltonian. Furthermore, the diameter of Eye(s) is 0(log n), where n is the number of vertices in the Mph and to be precise, n = 6(2(s) - 1) vertices.
Construction schemes for fault-tolerant Hamiltonian graphs
(2000-05-01)
Wang, JJ
;
Hung, CN
;
Tan, JJM
;
Hsu, LH
;
Sung, TY
In this paper, we present three construction schemes for fault-tolerant Hamiltonian graphs. We show that applying these construction schemes on fault-tolerant Hamiltonian graphs generates graphs preserving the original Hamiltonicity property. We apply these construction schemes to generate some known families of optimal 1-Hamiltonian graphs in the literature and the Hamiltonicity properties of these graphs are the direct consequence of the construction schemes. In addition, we can use these construction schemes to propose new family of optimal 1-Hamiltonian graphs. (C) 2000 John Wiley & Sons, Inc.
Model-based synthetic fuzzy logic controller for indirect blood pressure measurement
(2002-06-01)
Wang, JJ
;
Lin, CT
;
Liu, SH
;
Wen, ZC
;
電控工程研究所
In this paper, a new measurement system for the non-invasive monitoring of the continuous blood pressure waveform in the radial artery is presented. The proposed system comprises a model-based fuzzy logic controller, an arterial tonometer and a micro syringe device. The flexible diaphragm tonometer is to register the continuous blood pressure waveform. To obtain accurate measurement without distortion, the tonometer's mean chamber pressure must be kept equal to the mean arterial pressure (MAP), the so-called optimal coupling condition, such that the arterial vessel has the maximum compliance. Since the MAP cannot be measured directly, to keep the optimal coupling condition becomes a tracking control problem with unknown desired trajectory. To solve this dilemma, a model-based fuzzy logic controller is designed to compensate the change of MAP by applying a counter pressure on the tonometer chamber through the micro syringe device. The proposed controller consists of a model-based predictor and a synthetic fuzzy logic controller (SFLC). The model-based predictor is to estimate the MAPs changing tendency based on the identified arterial pressure-volume model. The SFLC is composed of three subcontrollers, each of which is a simple fuzzy logic controller, for processing the three changing states of the MAP: ascending, descending and stabilizing states, respectively. Simulation results show that, for the MAP with changing rates of +/-10, +/-20 or +/-30 mm Hg/min, the model-based SFLC can beat-to-beat adjust the tonometer's chamber pressure only with a mean square error of 1.9, 2.2, or 2.8 nun Hg, respectively.
On the isomorphism between cyclic-cubes and wrapped butterfly networks
(2000-08-01)
Hung, CN
;
Wang, JJ
;
Sung, TY
;
Hsu, LH
;
資訊工程學系
We show that the cyclic-cubes defined by Ada W.C. Fu and S.C. Chau [1] are isomorphic to k-ary wrapped butterfly networks.
Optimal 1-Hamiltonian graphs
(1998-02-13)
Wang, JJ
;
Hung, CN
;
Hsu, LH
;
資訊工程學系
;
Department of Computer Science
In this paper, we present a family of 3-regular, planar, and hamiltonian graphs. Any graph in this family remains hamiltonian if any node or any edge is deleted. Moreover, the diameter of any graph in this family is O(root p) where p is the number of nodes. (C) 1998 Elsevier Science B.V.
Reduction of interference in oscillometric arterial blood pressure measurement using fuzzy logic
(2003-04-01)
Lin, CT
;
Liu, SH
;
Wang, JJ
;
Wen, ZC
;
電控工程研究所
In oscillometry, oscillation amplitudes (OAs) embedded in the cuff pressure are drastically affected by a variety of artifacts and cardiovascular diseases, leading to inaccurate arterial blood pressure (ABP) measurement. The purpose of this paper is to improve the accuracy in the arterial pressure measurement by reducing interference in the OAs using a recursive weighted regression algorithm (RWRA). This method includes a fuzzy logic discriminator (FLD) and a recursive regression algorithm. The FLD is used to reduce the effect of artifacts caused by measurement motion disturbance or cardiovascular diseases, and to determine the truthfulness of the oscillation pulse. According to the truth degree, the relationship between the cuff pressure and OA is reconstructed using the regression algorithm. Because the regression method must utilize inverse matrix operation, which will be difficult to implement in an automatic or ambulatory monitor, the recursive regression method is proposed to solve this problem. To test the performance of this RWRA, 47 subjects underwent the ABP measurement using both the auscultation and the oscillometry combined with the RWRA. It was found that the average difference between the pooled blood pressures measured by the auscultation and those by the oscillometry combined with the RWRA was found to be only 4.9 mmHg. Clinical results demonstrated that the proposed RWRA is more robust than the traditional curve fitting algorithm (TCFA). We conclude that the proposed RWRA can be applied to effectively improve the accuracy of the oscillometric blood pressure measurement.
Synthesis of bulk beta-FeSi2 crystal
(2002-06-01)
Hsu, YK
;
Wang, JJ
;
Chang, CS
;
Wang, SC
;
光電工程學系
The feasibility of adopting two methods to synthesizing the bulk crystal of beta-FeSi2, was examined: one involving two-step Bridgmann growth with a three-zone furnace and another invoking melting growth with a single zone furnace, As-grown iron disilicides were annealed in the furnaces at different temperatures for various durations, Experimental result,; indicate that a larger beta-FeSi, crystal can be obtained using the two-step fast Bridgmann growth method kith post-annealing at 1073 K for 300h. Fast cooling and adding some copper impurities to the raw materials were found to promote the growth of beta-FeSi2. The iron disilicide crystal. with a large contribution from the 8 phase, supported a higher thermoelectric power. A thermoelectric power of 450 muV/K was obtained at 300-900 K for the sample with copper doping The energy hand gap of beta-FeSi2 samples was about 0.82-0.88 eV. determined by measuring the temperature-dependent resistivity.