Performance assessment of repairable system in series configuration under different types of failure and repair policies using copula linguistics

Automatic Modulation Classification (AMC) is of paramount importance in wireless communication systems. Existing methods usually adopt a single category of neural network or stack different categories of networks in series, and rarely extract different types of features simultaneously in a proper way. When it comes to the output layer, softmax function is applied for classification to expand the inter-class distance. In this paper, we propose a hybrid parallel network for the AMC problem. Our proposed method designs a hybrid parallel structure which utilizes Convolution Neural Network (CNN) and Gate Rate Unit (GRU) to extract spatial features and temporal features respectively. Instead of superposing these two categories of features directly, three different attention mechanisms are applied to assign weights for different types of features. Finally, a cosine similarity metric named Additive Margin softmax function, which can expand the inter-class distance and compress the intra-class distance simultaneously, is adopted for output. Simulation results demonstrate that the proposed method can achieve remarkable performance on an open access dataset.

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Performance assessment of the complex repairable system with n-identical units under (k-out-of-n: G) scheme and copula linguistic repair approach

International Journal of Quality & Reliability Management ◽

10.1108/ijqrm-10-2020-0343 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

V. V. Singh ◽

Abubakkar Idris Mohhammad ◽

Kabiru Hamisu Ibrahim ◽

Ibrahim Yusuf

Keyword(s):

Complex System ◽

Design Methodology ◽

New Method ◽

Social Implications ◽

Repairable System ◽

Variable Technique ◽

Content Type ◽

Different Types ◽

Theoretical Assessment ◽

Practical Implications

PurposeThis paper analyzed a complex system consisting n-identical units under a k-out-of-n: G; configuration via a new method which has not been studied by previous researchers. The computed results are more supportable for repairable system performability analysis.Design/methodology/approachIn this paper, the authors have analyzed a complex system consisting n-identical units under a k-out-of-n: G; configuration via a new method which has not been studied by previous researchers. The supplementary variable technique has employed for analyzing the performance of the system.FindingsReliability measures have been computed for different types of configuration. It generalized the results for purely series and purely parallel configurations.Research limitations/implicationsThis research may be beneficial for industrial system performances whereas a k-out-of-n-type configuration exists.Practical implicationsNot sure as it is a theoretical assessment.Social implicationsThis research may not have social implications.Originality/valueThis work is the sole work of authors that have not been communicated to any other journal before.

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Determining the environmental indicators for vehicles of different categories in relation to CO2 emission based on road tests

Combustion Engines ◽

10.19206/ce-2017-310 ◽

2017 ◽

Vol 170 (3) ◽

pp. 66-72

Author(s):

Jerzy MERKISZ ◽

Łukasz RYMANIAK

Keyword(s):

Co2 Emissions ◽

Operating Time ◽

Environmental Indicators ◽

Operating Conditions ◽

Si Engine ◽

Propulsion Systems ◽

System A ◽

In Series ◽

Series Configuration ◽

Ci Engine

The article discusses the possibility of determining the environmental indicators for vehicles of different categories in relation to CO2 emissions. These are called toxicity indicators because they concern the compounds: CO, THC and NOx. Three Euro V compliant vehicles with different propulsion systems types were used for the study: a 0.9 dm3 urban passenger car with a SI engine and a start-stop system, a 2.5 dm3 off-road vehicle with a CI engine, and a city bus with a hybrid drive system in series configuration and a CI engine with a displacement of 6.7 dm3. Measurements were made in actual operating conditions in the Poznan agglomeration using a portable emissions measurement system (PEMS). The paper presents the characteristics of the operating time shares of vehicles and propulsion systems as well as CO2 emissions depending on the engine load and crankshaft rotational speed for individual vehicles. The determined toxicity indicators allowed to indicate their usefulness, to make comparisons between tested vehicles, and to identify directions for further work on the application and interpretation of these indicators.

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Performance Evaluation Methods for Microgrippers

Volume 4: 19th Design for Manufacturing and the Life Cycle Conference; 8th International Conference on Micro- and Nanosystems ◽

10.1115/detc2014-35162 ◽

2014 ◽

Cited By ~ 2

Author(s):

Serena Ruggeri ◽

Gianmauro Fontana ◽

Irene Fassi ◽

Giovanni Legnani

Keyword(s):

Performance Evaluation ◽

Performance Assessment ◽

Evaluation Methods ◽

Preliminary Survey ◽

Quantitative Methodology ◽

Performance Indices ◽

Task Requirements ◽

Different Types ◽

Definition Of

In precise manipulation and assembly of components with sub-millimetric dimensions, the role of the gripping tools is fundamental. In the literature, many different types of the so-called microgrippers have been presented, based on different working principles, to cope with the issues related to the gripping, the handling and the release of different micro-components. Depending on the component properties, the task requirements and the system constraints, a microgripper could be more suitable than another and allow the achievement of higher performance. However, the performance assessment of the microgrippers lacks of a standardized and quantitative methodology. Many authors declare the good capabilities of their tools in a qualitative way or according to the results obtained executing specific and different tasks. For this reason, it is often difficult to compare different microgrippers and estimate the actual results that can be obtained e.g. in the gripping or the release of a component. In this context, after a preliminary survey of the adopted approaches in literature and of their meaning, this paper investigates the conception and formalization of methods and procedures to evaluate the performance of a generic microgripper and the definition of standard performance indices to support the presentation of the microgripper characteristics.

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MICROWAVE MEMS SWITCHES IN SERIES CONFIGURATION: TECHNOLOGY AND CIRCUITAL MODELING

Sensors and Microsystems ◽

10.1142/9789812701770_0060 ◽

2005 ◽

Author(s):

R. MARCELLI ◽

F. GIACOMOZZI ◽

B. MARGESIN ◽

G. BARTOLUCCI ◽

G. MINUCCI

Keyword(s):

Mems Switches ◽

In Series ◽

Series Configuration

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