scholarly journals PAID – A NOVEL FRAMEWORK FOR DESIGN AND SIMULATION OF ASYNCHRONOUS CIRCUITS

2011 ◽  
Vol 14 (2) ◽  
pp. 37-45 ◽  
Author(s):  
Vu Duc Anh Dinh
Keyword(s):  
Design Method ◽  
Asynchronous Circuits ◽  
Low Noise ◽  
Design Tool ◽  
Clock Signal ◽  
Levels Of Abstraction ◽  
Synchronous Circuits ◽  
High Level ◽  
Local Synchronization ◽  
Asynchronous Circuit Design

Contrary to the synchronous circuits, the asynchronous circuits operate with a mechanism of local synchronization (without clock signal). For many years, they showed their relevance with respect to the synchronous circuits thanks to their properties of robustness, low power, low noise and modularity. However, the lack of design methods and associated tools prevents them from being widely spread. This paper deals with a new design methodology for integrated asynchronous circuits and EDA tools. The suggested design method allows on one hand to model circuits in a highlevel language, and on the other hand to generate circuits using only elementary logical gates and Muller gates. This method was prototyped by the development of an EDA design tool for asynchronous circuits. The combination of design methodologies and supporting tools creates a design framework for asynchronous circuits, namely PAiD ("Project of Asynchronous Circuit Design"). This framework allows compilation and synthesis of circuits, described by high-level language ADL ("Asynchronous Description Language"), to generate asynchronous circuits. The result of the synthesizer is a functional netlist of the circuits. This netlist can be then mapped to a specific-technology gate library for asynchronous circuits. During the design process, the circuit can be tested through the simulation process in different levels of abstraction.

scholarly journals Design of Inward-Turning External Compression Supersonic Inlet for Supersonic Transport Aircraft

INSIST ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 104
Author(s):  
Muhammad Adnan Utomo ◽  
Romie Oktavianus Bura
Keyword(s):  
Cfd Simulation ◽  
Design Method ◽  
Low Noise ◽  
Design Tool ◽  
Flow Distortion ◽  
External Compression ◽  
Cross Sectional ◽  
Minimum Requirement ◽  
Inlet Geometry ◽  
The Military

Inward-turning external compression intake is one of the hybrid intakes that employs both external and internal compression intakes principle. This intake is commonly developed for hypersonic flight due to its efficiency and utilizing fewer shockwaves that generate heat. Since this intake employ less shockwaves, this design can be applied for low supersonic (Mach 1.4 - 2.5) intakes to reduce noise generated from the shockwaves while maintaining the efficiency. Other than developing the design method, a tool is written in MATLAB language to generate the intake shape automatically based on the desired design requirement. To investigate the intake design tool code and the performance of the generated intake shape, some CFD simulation were performed. The intake design tool code can be validated by comparing the shockwave location and the air properties in every intake's stations. The performance parameters that being observed are the intake efficiency, flow distortion level at the engine face, and the noise level generated by the shockwaves. The design tool written in MATLAB is working as intended. Two dimensional axisymmetric CFD simulations validation has been done and the design meets the minimum requirement. As for the 3D inlet geometry, with a little modification on diffuser and equipping vent to release the buildup pressure, the inlet has been successfully met the military standard on inlet performance (MIL-E-5007D). This design method also has feature to fit every possible throat cross sectional shapes and has been proven to work as designed.Keywords— Inward-turning, Supersonic, Engine Intakes, Low- noise, Design Method

scholarly journals A Novel Strategy for Formal Verication of Asynchronous Circuit Design in PAiD tool

1970 ◽  
Vol 9 (1) ◽  
pp. 64-73
Author(s):  
Tin Thien Nguyen ◽  
Khoi-Nguyen LE-HUU ◽  
Thang H. Bui ◽  
Anh-Vu Dinh-Duc
Keyword(s):  
Circuit Design ◽  
Asynchronous Circuits ◽  
Ho Chi Minh City ◽  
Electronic Systems ◽  
Synchronous Circuits ◽  
University Of Technology ◽  
Long Time ◽  
Novel Strategy ◽  
Asynchronous Circuit Design ◽  
Reliable Software

EDA has been proposed for a long time as a category of reliable software tools for designing electronic systems. Although some of them have been considered as powerful tools for asynchronous circuits, a prominent approach to cope with the biggest defect of synchronous circuits: clock distribution issue, researches in verifying the correctness of those circuits are still limited. Therefore, an enhanced version of PAiD, an EDA tool that has been developed at Ho Chi Minh City University of Technology (HCMUT), will be proposed in this work along with case studies. It will enable engineers not only design, synthesize asynchronous circuits but also verify them. Furthermore, a good strategy to improve the verifying performance is also discussed.

scholarly journals Design Of Modified Data Driven Clock Gating And Look Ahead Clock Gating For Low Power

2018 ◽  
Vol 6 (2) ◽  
pp. 32-36
Author(s):  
V. Nirmaladevi ◽  
Angel Prabha
Keyword(s):  
Low Power ◽  
Power Dissipation ◽  
Low Noise ◽  
Data Driven ◽  
Clock Signal ◽  
Switching Activity ◽  
Clock Gating ◽  
Synchronous Circuits ◽  
Look Ahead ◽  
Large Frequency

Clock signal is considered as an immense source of power dissipation in synchronous circuits because of large frequency and load. It does not carry any information but consumes high power at the switching activity which is to be avoided. So, by using clock gating we can save power by reducing unnecessary transition activity inside the gated module. Hence modified design of data driven clock gating and look ahead clock gating is designed to obtain the less power in the circuits. These two techniques are compared among them and by the results obtained through cadence virtuoso tool we can conclude that look ahead clock gating consumes low power, low noise response and higher performance.

scholarly journals Model-Driven Architectural Framework towards Safe and Secure Nuclear Power Reactors

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5136
Author(s):  
Bassem Ouni ◽  
Christophe Aussagues ◽  
Saadia Dhouib ◽  
Chokri Mraidha
Keyword(s):  
Nuclear Power ◽  
Nuclear Reactors ◽  
System Development ◽  
Levels Of Abstraction ◽  
Model Driven ◽  
Case System ◽  
Architectural Framework ◽  
Performance Check ◽  
High Level ◽  
Different Levels

Sensor-based digital systems for Instrumentation and Control (I&C) of nuclear reactors are quite complex in terms of architecture and functionalities. A high-level framework is highly required to pre-evaluate the system’s performance, check the consistency between different levels of abstraction and address the concerns of various stakeholders. In this work, we integrate the development process of I&C systems and the involvement of stakeholders within a model-driven methodology. The proposed approach introduces a new architectural framework that defines various concepts, allowing system implementations and encompassing different development phases, all actors, and system concerns. In addition, we define a new I&C Modeling Language (ICML) and a set of methodological rules needed to build different architectural framework views. To illustrate this methodology, we extend the specific use of an open-source system engineering tool, named Eclipse Papyrus, to carry out many automation and verification steps at different levels of abstraction. The architectural framework modeling capabilities will be validated using a realistic use case system for the protection of nuclear reactors. The proposed framework is able to reduce the overall system development cost by improving links between different specification tasks and providing a high abstraction level of system components.

Development of a New Design Method for High Efficiency Swept Low Pressure Axial Fans With Small Hub/Tip Ratio

2014 ◽  
Author(s):  
Thore Bastian Lindemann ◽  
Jens Friedrichs ◽  
Udo Stark
Keyword(s):  
High Efficiency ◽  
Design Method ◽  
Tangential Velocity ◽  
Pressure Rise ◽  
Low Pressure ◽  
Aerodynamic Performance ◽  
Low Noise ◽  
Angle Distribution ◽  
Sweep Angle ◽  
Reduced Pressure

For a competitive low pressure axial fan design low noise emission is as important as high efficiency. In this paper a new design method for low pressure fans with a small hub to tip ratio including blade sweep is introduced and discussed based on experimental investigations. Basis is an empirical axial and tangential velocity distribution at the rotor outlet combined with a distinctive sweep angle distribution along the stacking line. Several fans were designed, built and tested in order to analyze the aerodynamic as well as the aeroacoustic behavior. For the aerodynamic performance particular attention was paid to compensate the influence of reduced pressure rise and efficiency due to increasing blade sweep. This was achieved by a method of increasing the blade chord depending on the local sweep angle which is based on single airfoil data. The tested fans without this compensation revealed a significant noise reduction effect of up to approx. 6 dB(A) for a tip sweep angle of 64° which was accompanied by an unsatisfactory effect of reduced overall aerodynamic performance. The second group of fans did not only confirm the method of the aerodynamic compensation by a nearly unchanged pressure rise and efficiency characteristic but also revealed an increased aeroacoustic benefit of in average 9.5 dB(A) compared to the unswept version. Beside the overall characteristics the individual differences between the designs are also discussed using results of wall pressure measurements which show some significant changes of the blade tip flow structure.

POVERTY REDUCTION, UNEMPLOYMENT AND RURAL DEVELOPMENT; AFTERMATH OF COVID-19 PANDEMIC IN NIGERIA

2021 ◽  
Vol 9 (1) ◽  
pp. 36-49
Author(s):  
Oderinu Hassana ◽  
◽  
Kadir Mumini ◽  
Tijani Adebayo ◽  
Keyword(s):  
Economic Development ◽  
Rural Development ◽  
Rural Areas ◽  
Poverty Reduction ◽  
Design Method ◽  
Gear Up ◽  
Global Pandemic ◽  
High Level ◽  
Almost All ◽  
Self Administered Questionnaire

Nigeria has one of the countries whose experience of poverty and unemployment is on the high side makes this study to look into the effect of the economic lockdown during the global pandemic in the country, with the aim of making effort on how this effect can be translated into economic development. Survey research design method was adopted with self-administered questionnaire used to collect data. Findings revealed that in Nigeria COVID -19 outbreak effects was felt in almost all sectors and the aftermath greatly affected the country’s GDP and this adversely affect rural development in the country, which translated to a worrisome rate of poverty and unemployment. Hence, both individual and government have now seen that campaigning for economic diversification is not sufficient for economic development but rather a prompt swing into action by all is needed for sustainable development of rural areas to respond to the worrisome rate of unemployment and in turn high level of poverty caused by the COVID-19 lockdown in the country. It was recommended that government at all level as well as individuals and stakeholders should put in place actions that would gear up rural development and set policies at their various helms of affairs that would encourage economic participation of all citizens in all sector of the economy.

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