We performed a meta-analysis of 31 studies comparing the results of fractional flow reserve (FFR) against quantitative coronary angiography (QCA) and/or noninvasive imaging of the same lesions. Studies were retrieved from PubMed (last search February 2006). Across 18 studies (1,522 lesions), QCA had a random effects sensitivity of 78% (95% confidence interval [CI] 67 to 86) and specificity of 5...

Quantum-dot cellular automata (QCA) are a promising nanotechnology to implement digital circuits at the nanoscale. Devices based on QCA have the advantages of faster speed, lower power consumption, and greatly reduced sizes. In this paper, we are presented the circuits, which generate random numbers in QCA.  Random numbers have many uses in science, art, statistics, cryptography, gaming, gambli...

OBJECTIVE To identify mismatches in the significance ofcoronary artery stenosis determined by physician 's visual estimation (VE) vs. quantitative coronary angiography (QCA), by VE vs. fractional flow reserve (FFR), and independent predictors for mismatch between VE and FFR. Second objective was to evaluate the clinical outcomes ofpatients receiving FFR-guided percutaneous coronary intervention...

In the present paper a solution of the generalizedquadratic functional equation$$f(kx+ y)+f(kx+sigma(y))=2k^{2}f(x)+2f(y),phantom{+} x,yin{E}$$ isgiven where $sigma$ is an involution of the normed space $E$ and$k$ is a fixed positive integer. Furthermore we investigate theHyers-Ulam-Rassias stability of the functional equation. TheHyers-Ulam stability on unbounded domains is also studied.Applic...

Quantum-dot Cellular Automata (QCA) provide very high scale integration potential, switching frequency, and have extremely low power demands, which make the QCA technology quite attractive for design implementation of large-scale, high-performance nanoelectronic circuits. However, state-of-the-art circuit designs were not derived by following a set universal rules, as is case CMOS circuits, and...

To determine the reliability of geometric (edge-detection) quantitative coronary angiographic analysis (QCA) of restenosis within a new Cordis tantalum stent, QCA and intracoronary ultrasound (ICUS) measurements were compared in both an experimental restenosis model and in the clinical follow-up of patients. In the experimental series, Plexiglas phantom vessels with concentric stenosis channels...

OBJECTIVES There is limited data on how well 2D-QCA and OCT agree with each other for measurement of coronary artery lumen dimensions. We aimed to assess the agreement between the two modalities. METHODS Patients undergoing OCT for assessment of coronary artery lesions were reviewed. Minimum luminal diameter (MLD), proximal reference diameter and distal reference diameter were measured for ea...

by Minjun Yan Quantum-dot cellular automata (QCA) is an emerging, promising, future generation computational architecture that encodes binary information into the positions of electrons. The switching and logic function of this transistorless architecture has already been realized in metal QCA and magnetic QCA. “Bottom-up” molecular implementation may not only circumvent the lithography limits,...

Over the last two decades , quantum-dot cellular automata (QCA) has received significant attention as an emerging computing technology (Lent et al., 1993). The basic elements in this technology are the QCA cells, as shown in Fig. 1. Each cell contains two mobile electrons and four quantum dots located in the corners. As per the occupancy of the electrons in the dots, a QCA cell can take differe...