Clocking-Based Coplanar Wire Crossing Scheme for QCA

2010 ◽  
Author(s):  
Devadoss Rajeswari ◽  
Kolin Paul ◽  
M. Balakrishnan
Keyword(s):  
Wire Crossing

scholarly journals The Results of a New Distal Protection Method in Intervention for Chronic Total Occlusion of the Superficial Femoral Artery

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
Tomoko Kobayashi ◽  
Atsushi Funatsu ◽  
Emiko Ejima ◽  
Hiromi Muranishi ◽  
Makoto Utsunomiya ◽  
...  
Keyword(s):  
Ultrasound Images ◽  
Distal Embolization ◽  
Total Occlusion ◽  
Chronic Total Occlusions ◽  
Protection Method ◽  
Wire Crossing ◽  
The Mean ◽  
Distal Protection ◽  
Wire Resistance ◽  
Guiding Catheter

Aims. To determine the efficacy of a new distal protection method in SFA CTO interventions.Methods and Results. From June 2003 to February 2009, ninety-two consecutive, chronic total occlusions of superficial femoral arteries were treated with catheter-based intervention using a bidirectional approach. Nine of these cases were managed with our original, distal protection method, based on symptoms, angiographic images, wire resistance, and intravascular ultrasound images. The average age was 73 years; eight patients were male. The mean occlusion length was 17.1 cm. A distal protection balloon was inserted from the retrograde sheath in the popliteal artery and placed distal to the occluded lesion after successful wire crossing. Lesion dilatation with a balloon was performed antegradely and debris was removed by 6Fr. guiding catheter. Debris was retrieved from all lesions, consisting mainly of thrombus. Where we decided not to use the distal protection method, there was no distal thromboembolism.Conclusion. In SFA-CTO intervention, the risk of distal embolization is 10%, which can be anticipated and eliminated by the distal protection method.

A new approach to bypass wire crossing problem in QCA nano technology

Circuit World ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ali Majeed ◽  
Esam Alkaldy
Keyword(s):  
Power Dissipation ◽  
Single Layer ◽  
Complementary Metal Oxide Semiconductor ◽  
Full Adder ◽  
Cmos Technology ◽  
Oxide Semiconductor ◽  
Nano Technology ◽  
New Approach ◽  
Content Type ◽  
Wire Crossing

Purpose This study aims to replace current multi-layer and coplanar wire crossing methods in QCA technology to avoid fabrication difficulties caused by them. Design/methodology/approach Quantum-dot cellular automata (QCA) is one of the newly emerging nanoelectronics technology tools that is proposed as a good replacement for complementary metal oxide semiconductor (CMOS) technology. This technology has many challenges, among them being component interconnection and signal routing. This paper will propose a new wire crossing method to enhance layout use in a single layer. The presented method depends on the central cell clock phase to enable two signals to cross over without interference. QCADesigner software is used to simulate a full adder circuit designed with the proposed wire crossing method to be used as a benchmark for further analysis of the presented wire crossing approach. QCAPro software is used for power dissipation analysis of the proposed adder. Findings A new cost function is presented in this paper to draw attention to the fabrication difficulties of the technology when designing QCA circuits. This function is applied to the selected benchmark circuit, and the results show good performance of the proposed method compared to others. The improvement is around 59, 33 and 75% compared to the best reported multi-layer wire crossing, coplanar wire crossing and logical crossing, respectively. The power dissipation analysis shows that the proposed method does not cause any extra power consumption in the circuit. Originality/value In this paper, a new approach is developed to bypass the wire crossing problem in the QCA technique.

Design and Implementation of QCA D-Flip-Flops and RAM Cell Using Majority Gates

2019 ◽  
Vol 28 (05) ◽  
pp. 1950079 ◽  
Author(s):  
Trailokya Nath Sasamal ◽  
Ashutosh Kumar Singh ◽  
Umesh Ghanekar
Keyword(s):  
Circuit Design ◽  
High Speed ◽  
High Performance ◽  
Single Layer ◽  
Memory Cell ◽  
Design Parameters ◽  
Flip Flop ◽  
Negative Edge ◽  
Wire Crossing ◽  
The Common

Quantum-dot cellular automata (QCA) is one of the promising technologies that enable nanoscale circuit design with high performance and low-power consumption features. As memory cell and flip-flops are rudimentary for most of the digital circuits, having a high speed, and a less complex memory cell is significantly important. This paper presents novel architecture of D flip-flops and memory cell using a recently proposed five-input majority gate in QCA technology and simulated by QCADesigner tool version 2.0.3. The simulation results show that the proposed D flip-flops and the memory cell are more superior to the existing designs by considering the common design parameters. The proposed RAM cell spreads over an area of 0.12[Formula: see text][Formula: see text]m2and delay of 1.5 clock cycles. The proposed level-triggered, positive/negative edge-triggered, and dual edge-triggered D flip-flop uses 14%, 33%, and 21% less area, whereas the latency is 40%, 27%, and 25% less when compared to the previous best design. In addition, all the proposed designs are implemented in a single layer QCA and do not require any single or multilayer wire crossing.

Modular design of QCA carry flow adders and multiplier with reduced wire crossing and number of logic gates

2015 ◽  
Vol 44 (7) ◽  
pp. 1351-1366 ◽  
Author(s):  
Yongqiang Zhang ◽  
Hongjun Lv ◽  
Huakun Du ◽  
Cheng Huang ◽  
Shuai Liu ◽  
...  
Keyword(s):  
Modular Design ◽  
Logic Gates ◽  
Wire Crossing

Initial result of an angioscopy-guided wire crossing technique under continuous saline infusion for chronic total occlusion in femoropopliteal disease

2019 ◽  
Vol 14 (13) ◽  
pp. 1416-1419 ◽  
Author(s):  
Masamichi Yano ◽  
Keisuke Yasumura ◽  
Koji Yasumoto ◽  
Akihiro Tanaka ◽  
Naoki Mori ◽  
...  
Keyword(s):  
Chronic Total Occlusion ◽  
Initial Result ◽  
Saline Infusion ◽  
Total Occlusion ◽  
Wire Crossing

The Effect of Aggressive Wire Recanalization in Calcified Atheroma and Dilatation (ARCADIA) Technique in Eccentric Calcified Lesion of No-stenting Zone

2021 ◽  
pp. 152660282110570
Author(s):  
Hirokazu Konishi ◽  
Ryoji Koshida ◽  
Maoto Habara ◽  
Kenya Nasu ◽  
Keisuke Hirano ◽  
...  
Keyword(s):  
Target Lesion ◽  
Primary Patency ◽  
Scoring Balloon ◽  
Cross Section Area ◽  
Calcified Lesion ◽  
Section Area ◽  
Wire Crossing ◽  
Calcified Plaque ◽  
Artery Disease ◽  
One Year

Purpose: The endovascular approach for eccentric calcified lesions of the no-stenting zone is challenging. This study aimed to investigate the effect of a novel technique for these lesions. Methods: We performed EVT for severe and eccentric calcified lesions using the technique, which is presented previously and named aggressive wire recanalization in calcified atheroma and dilatation (ARCADIA). In brief, a guidewire is passed to the residual lumen firstly. Next, another guidewire is advanced into and cross through the calcified plaque and returned to the distal original lumen with intravascular ultrasound (IVUS) guided. The calcified plaque is dilated by using a scoring-balloon or non-compliant balloon. Results: Consecutive 14 peripheral artery disease patients with isolated and eccentric calcification in a no-stenting zone were treated using ARCADIA technique between January 2018 and March 2020. In IVUS data, lumen cross-section area was significantly increased from 5.2 ± 2.0 mm2 to 18.1 ± 6.9 mm2 (p < 0.01), lumen area was expanded roundly evaluating as symmetry index from 0.45 ± 0.09 to 0.81 ± 0.12 (p < 0.01). There were no distal embolization and perforation after ARCADIA technique. One-year target lesion revascularization occurred in only 2 cases. The primary patency of 1 year was 85.7%. Conclusion: ARCADIA technique is safe and appropriate, and can be 1 option to treat for eccentric calcified lesions of the no-stenting zone as an optimal wire crossing method.

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