scholarly journals 1/n Turbo codes from linear system point of view

2020 ◽  
Vol 114 (3) ◽  
Author(s):  
Victoria Herranz ◽  
Diego Napp ◽  
Carmen Perea
Keyword(s):  
Linear System ◽  
Turbo Codes ◽  
Point Of View ◽  
System Point

Analytical Investigation of the Effects of Induction Motor Transients on Compressor Drive Shafts

2011 ◽  
Author(s):  
Anand Srinivasan
Keyword(s):  
Mechanical System ◽  
Induction Motor ◽  
Analytical Investigation ◽  
Point Of View ◽  
Electrical Parameters ◽  
Short Circuits ◽  
Torque Values ◽  
Driving Torque ◽  
Electrical Supply ◽  
System Point

Centrifugal compressors driven by induction motors are most common in the turbomachinery industry. When sudden transients occur in the driver due to upsets in electrical supply to the motor, the air-gap torque generated by the motor undergoes a transient spike. This in turn gets transmitted through the coupling to the drive-shaft of the driven equipment, causing momentary high spikes in vibration that are torsional in nature, and can sometimes result in shaft torques that can create catastrophic damage to driven equipment components. In order to analytically predict these peak torques that can occur during transients, a complete drive-train torsional model needs to be created for the mechanical system, and the driving torque values need to be derived from the motor electrical system of equations. Various line faults are possible with induction motor driven equipment. A generalized analytical procedure based on motor electrical parameters to predict the peak shaft torques of compressor drive shafts is investigated in this paper. The effects of shaft transients due to 3-phase short circuits and reclosures are analyzed. The simulation has been performed for an industrial compressor train, and has been presented from a mechanical system point of view, rather than electrical. Comparisons and inferences are also made based on the simulation results.

scholarly journals Ecological aspect of mobile systems operated in terrain conditions

2012 ◽  
Vol 49 (No. 3) ◽  
pp. 119-123
Author(s):  
A. Janeček ◽  
M. Mikleš
Keyword(s):  
Production System ◽  
Energy Flow ◽  
Forest Ecosystems ◽  
Operating Performance ◽  
Point Of View ◽  
Mobile Systems ◽  
Ecological Aspect ◽  
Optimal Values ◽  
Theoretical Results ◽  
System Point

In this paper is evaluated an optimal constructional and operating performance of the mobil terrain system, that works in forest ecosystems from point of view of volume of processed biomass and total amount of logging transport erosion. A monitored terrain system, working in forestry, is considered as a production system, with its material and energy flow. The determination value, that optimizes the production system, is the operating and constructional performance. In this paper is evaluated the amount erosion in dependence of cutting mass, by means of mathematics and from system point of view. The conditions for the mobile terrain system work, that insure optimal, i.e. minimal value of erosion will be determined. The theoretical results are verified. The optimal values of soil erosion are determined by experimental measurements. The principles of the paper are based on theses of ecological synthesis that determine coupling between dissipative energy of a production system and its ecological cleanliness of work.

Social Norms from a Goal-System Point of View: Contributions of Activity Analysis

2018 ◽  
Vol 40 (2) ◽  
pp. 73-86
Author(s):  
Jean-Baptiste Corrégé ◽  
Céline Clavel ◽  
Julien Christophe ◽  
Mehdi Ammi
Keyword(s):  
Social Norms ◽  
Activity Analysis ◽  
Point Of View ◽  
Goal System ◽  
System Point

scholarly journals A Constructive Approach to Freyd Categories

2020 ◽  
Author(s):  
Sebastian Posur
Keyword(s):  
Linear System ◽  
Linear Systems ◽  
Computer Algebra ◽  
Point Of View ◽  
Standard Approach ◽  
Constructive Approach ◽  
Additive Category ◽  
Computational Structure ◽  
Alpha Beta ◽  
Finitely Presented

Abstract We discuss Peter Freyd’s universal way of equipping an additive category $$\mathbf {P}$$ P with cokernels from a constructive point of view. The so-called Freyd category $$\mathcal {A}(\mathbf {P})$$ A ( P ) is abelian if and only if $$\mathbf {P}$$ P has weak kernels. Moreover, $$\mathcal {A}(\mathbf {P})$$ A ( P ) has decidable equality for morphisms if and only if we have an algorithm for solving linear systems $$X \cdot \alpha = \beta $$ X · α = β for morphisms $$\alpha $$ α and $$\beta $$ β in $$\mathbf {P}$$ P . We give an example of an additive category with weak kernels and decidable equality for morphisms in which the question whether such a linear system admits a solution is computationally undecidable. Furthermore, we discuss an additional computational structure for $$\mathbf {P}$$ P that helps solving linear systems in $$\mathbf {P}$$ P and even in the iterated Freyd category construction $$\mathcal {A}( \mathcal {A}(\mathbf {P})^{\mathrm {op}} )$$ A ( A ( P ) op ) , which can be identified with the category of finitely presented covariant functors on $$\mathcal {A}(\mathbf {P})$$ A ( P ) . The upshot of this paper is a constructive approach to finitely presented functors that subsumes and enhances the standard approach to finitely presented modules in computer algebra.

A Participatory Design Project on Mobile ICT

2009 ◽  
pp. 669-675
Author(s):  
Ursula Hyrkkänen ◽  
Juha Kettunen ◽  
Ari Putkonen
Keyword(s):  
Real Estate ◽  
Participatory Design ◽  
Participatory Development ◽  
Point Of View ◽  
Activity System ◽  
Work Activity ◽  
Special Software ◽  
Maintenance Personnel ◽  
Mobile Ict ◽  
System Point

The purpose of this article is to describe and assess the participatory development process of a palm computer with special software from the work activity system point of view and analyse the benefits and drawbacks experienced by an employee while testing, implementing, and using a new communication and collaboration tool. This study focuses on the maintenance personnel of Company Alpha (the name has been changed for this study). The workers are responsible for the maintenance and serving of real estate.

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