Explore the Inventory Problem in a System Point of View: A Lot Sizing Policy

2013 ◽  
pp. 1529-1537
Author(s):  
Tsung-Shin Hsu ◽  
Yu-Lun Su
Keyword(s):  
Lot Sizing ◽  
Point Of View ◽  
Inventory Problem ◽  
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.

An application of the system-point method to inventory models under continuous review

1986 ◽  
Vol 23 (03) ◽  
pp. 778-789
Author(s):  
K. Azoury ◽  
P. H. Brill
Keyword(s):  
Lead Time ◽  
Point Method ◽  
Inventory Level ◽  
Inventory Problem ◽  
Level Crossing ◽  
Stationary Probability Distribution ◽  
Continuous Review ◽  
Demand Processes ◽  
Relevant Cost ◽  
System Point

This paper derives the stationary probability distribution of inventory level for continuous-review models, by means of the system-point method of level-crossing analysis. We analyze inventory problems with decaying products under (nQ, r) and (s, S) ordering policies and zero lead-time, and derive the relevant cost functions. Our results have implications for the case of positive lead-time and to a non-decaying inventory problem with two types of demand processes.

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

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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