scholarly journals A multi-item manufacturing system with an outsourcer and random defective items

2021 ◽  
Vol 19 (4) ◽  
pp. 364-378
Author(s):  
Yuan-Shyi Peter Chiu ◽  
Jia-Hang Jhan ◽  
Victoria Chiu ◽  
Huei-Hsin Chang
Keyword(s):  
Optimization Technique ◽  
Efficient Production ◽  
Cost Component ◽  
Defective Items ◽  
Core System ◽  
Rotation Time ◽  
Long Run ◽  
Effective Option ◽  
Average System ◽  
The Individual

This study examines a multi-item manufacturing problem with a single machine, an outsourcer, and random defective items. To cope with the increasing multi-product demands from global markets, modern manufacturing firms must make an efficient production plan to satisfy customer’s needs with quality goods and smooth the in-house fabrication schedule and utilization. Outsourcing is an effective option to avoid machine overloads and smooth fabrication schedules. Further, the fabrication of random defective products is inevitable because of unanticipated factors in real manufacturing environments. These products must be identified, separated and discarded to retain the desired quality of the finished lot. To address the above-mentioned concerns, this study develops a mathematical model to represent a hybrid stock refilling system, employs mathematical derivations to find long-run average system expenses, and uses an optimization technique to derive a closed-form common rotation time for this hybrid system. The results of this study show the individual and combined impacts of variations in outsourcing percentages and scrap rates on optimal rotation time and diverse core system parameters (such as machine utilization, specific cost component, etc.) to facilitate planning, controlling, and decision making in such a particular hybrid fabrication system.

scholarly journals Why “Less is More” in Non-Financial Reporting Initiatives: Concrete Steps Towards Supporting Sustainability

2020 ◽  
Vol 10 (2) ◽  
Author(s):  
Georgina Tsagas ◽  
Charlotte Villiers
Keyword(s):  
Financial Reporting ◽  
Corporate Sustainability ◽  
Sustainability Reporting ◽  
Integrated Reporting ◽  
Less Is More ◽  
Csr Reporting ◽  
Corporate Reporting ◽  
Long Run ◽  
The Individual ◽  
Key Aspects

AbstractCalls are repeatedly made on corporations to respond to the challenges facing the planet from a sustainable development perspective and governments take solace in the idea that corporations' transparency on their corporate activity in relation to sustainability through voluntary reporting is adequately addressing the problem. In practice, however, reporting is failing to deliver truly sustainable results. The article considers the following questions: how does the varied reporting landscape in the field of non-financial reporting impede the objectives of fostering corporations' sustainable practices and which initiative, among the options available, may best meet the sustainability objectives after a decluttering of the landscape takes place?The article argues that the varied corporate reporting landscape constitutes a key obstacle to fostering sustainable corporate behaviour, insofar as the flexible and please all approach followed in the context of corporate sustainability reporting offers little to no real incentive to companies to behave more sustainably and ultimately pleases none in the long run. The case made is that “less is more” in non-financial reporting initiatives and hence the article calls for a revision of key aspects of the European Non-Financial Reporting Directive, which, as is argued, is more likely to achieve the furtherance of sustainable corporate behaviour. Although the different reporting requirements offer the benefits of focussing on different corporate goals and activities, targeting different audiences and allowing for a level of flexibility that respects the individual risks to sustainability associated with each industry, the end result is a landscape that lacks overall consistency and comparability of measurements and accountabilities, making accountability more, rather than less, difficult to achieve.The article acknowledges the existence of several variances relating to the notion of sustainability per se, which continues to remain a contested concept and variances between companies and industries in relation to how each is operating sustainably or unsustainably respectively. Such variances have so far inhibited the legislator from easily outlining through tailored legislation the individual risks to global sustainability in an all-encompassing manner. The end product is a chaotic system of financial reporting, CSR reporting, non-financial reporting and integrated reporting and little progress to increase comparability and credibility in order for companies to be held accountable and to behave in ways that do not harm the planet. A “clean up” of the varied initiatives in the terrain of non-financial reporting is recommended.

A Psycho-Educational Approach to Coping with Failure Amongst Pupils

1982 ◽  
Vol 3 (4) ◽  
pp. 231-235 ◽  
Author(s):  
Ruth Engel
Keyword(s):  
General Model ◽  
Early Stage ◽  
Educational Approach ◽  
Long Run ◽  
The Future ◽  
Basic Objective ◽  
The Individual

In this paper I hope to explain the reasons for developing a method to provide the individual with tools to cope with failure at an early stage of his life; additionally, the general principles of that method will be formulated. Obviously, the basic objective is ultimately aimed at conditioning the child's thinking towards development of different attitudes in relation to failure situations. Success of the method, in the long run, depends upon the repetition of similar techniques, at least during the first years of the child's schooling. Thus we tend to believe that if we ‘instil’ in the child the proposed way of relating, he will then be able to cope not only with failure in the future but also with pressures exerted by unskilled teachers in school, who may use failure as a threat. As an additional alternative there is proposed a general model of treating children who have not been trained at an earlier stage to deal with failure within the school framework.

scholarly journals SISFLOR: A COMPUTATIONAL SYSTEM TO DETERMINE THE OPTIMAL TREE BUCKING

2020 ◽  
Vol 28 ◽  
pp. 192-201
Author(s):  
Rodrigo Freitas Silva ◽  
Marcelo Otone Aguiar ◽  
Mayra Luiza Marques Da Silva ◽  
Gilson Fernandes Da Silva ◽  
Adriano Ribeiro De Mendonça
Keyword(s):  
Optimization Technique ◽  
Wood Products ◽  
Tree Level ◽  
Economic Losses ◽  
Computational System ◽  
Individual Tree ◽  
Optimal Tree ◽  
Cutting Pattern ◽  
Forest Enterprises ◽  
The Individual

A continuously competitive forest market and tied to the demands for wood products promotes the study and development of applications that increase the revenue of the forest enterprises. At harvesting, the cutting pattern (forest assortment) in which the trees are traced is traditionally determined by the experience of the chainsaw operator without using any optimization technique, which may result in economic losses in relation to the commercialized products. In general, there are numerous distinct assortments that can be chosen and hardly processed by a brute-force algorithm. This is the forest assortment problem at the individual tree level with the objetice of maximizing the commercial values of the felled trees. stem-level bucking optimization problem. The aim is to maximize the sales value of harvested trees. Dynamic Programming (DP) is an efficient optimization technique to determine the optimum bucking tree as it significantly reduces the number of calculations to be made. Thus, the objective of this work was to develop a modern and intuitive computational system that is able to find the optimum tree stem bucking through DP to help companies over the bole tracing, therefore, characterizing itself as a tool that supports decision making. After the execution of the system, the optimum assortment is shown by sequentially detailing all products that should be removed from the analyzed bole as well as their respective volumes and revenue.

scholarly journals Large Deviations for the Single-Server Queue and the Reneging Paradox

2021 ◽  
Author(s):  
Rami Atar ◽  
Amarjit Budhiraja ◽  
Paul Dupuis ◽  
Ruoyu Wu
Keyword(s):  
Large Deviations ◽  
Decay Rate ◽  
Sample Path ◽  
Arrival Rate ◽  
Rate Function ◽  
Service Rate ◽  
Single Server ◽  
Large Deviations Principle ◽  
Long Run ◽  
The Individual

For the M/M/1+M model at the law-of-large-numbers scale, the long-run reneging count per unit time does not depend on the individual (i.e., per customer) reneging rate. This paradoxical statement has a simple proof. Less obvious is a large deviations analogue of this fact, stated as follows: the decay rate of the probability that the long-run reneging count per unit time is atypically large or atypically small does not depend on the individual reneging rate. In this paper, the sample path large deviations principle for the model is proved and the rate function is computed. Next, large time asymptotics for the reneging rate are studied for the case when the arrival rate exceeds the service rate. The key ingredient is a calculus of variations analysis of the variational problem associated with atypical reneging. A characterization of the aforementioned decay rate, given explicitly in terms of the arrival and service rate parameters of the model, is provided yielding a precise mathematical description of this paradoxical behavior.

scholarly journals The road to sustainable creativity: mobile autonomy beyond auto-mobility

2015 ◽  
pp. 6-19
Author(s):  
Pascal Gielen
Keyword(s):  
Contemporary Art ◽  
Free Market ◽  
Organizational Structures ◽  
Contemporary Society ◽  
The Road ◽  
Long Run ◽  
The Individual ◽  
Market Solutions

AbstractHow can artists stay autonomous, and keep their creativity alive in the contemporary society? In this paper is stated that the individual bourgeois model of the artist is not sufficient any more to make autonomous art and to stay creative on the long run. If artists want to stay mobile and autonomous they need to build collective organizational structures, which are called 'traveling caravan'. In the parallel historical shifts between 1970 and 2000 from liberalism to neo-liberalism, from Fordism to post-Fordism and from modern to contemporary art, artists need to build up their own artistic biotope if they need to make their work without governmental interference (subsidizes) and free market solutions. The cooperative can be seen as an interesting model to develop such a 'mobile autonomy'.

scholarly journals Study of Human and Robot Social Interaction Using Artificial Cognition Methods

2020 ◽  
pp. 458-464
Author(s):  
Rupal Chaudhary
Keyword(s):  
Social Interaction ◽  
Control Systems ◽  
Mathematical Thinking ◽  
Point Of View ◽  
Wide Scope ◽  
Long Run ◽  
Normal Human ◽  
Express Information ◽  
The Individual ◽  
Human Robot Collaboration

Abstract. HRI challenges AI in numerous regards: dynamic, somewhat obscure conditions that were not initially intended for robots; a wide scope of circumstances with rich semantics to comprehend and decipher; physical associations with people that require fine, low-inactivity, yet socially satisfactory control systems; regular and multimodal correspondence. This paper is an endeavor to describe these difficulties and to introduce a lot of key dynamic issues that should be tended to for an intellectual robot to effectively impart space and assignments to a person. To begin with, we distinguish the individual and community oriented intellectual aptitudes required: mathematical thinking and circumstance appraisal dependent on point of view taking and cost-adequacy investigation; securing and the article talks about every one of these capacities, presents work executions and shows how they consolidate in a sound and unique human-robot collaboration deliberative design. Fortified by the aftereffects of the preliminary, we should in the long run exhibit how the board's express information, both symbolic and quantitative, is instrumental to more extravagant and more normal human-robot associations by squeezing for certain, human-level semantics inside the robot framework.

scholarly journals Optimization Technique Inspired Load Frequency Controller for Multi Area Power System with Renewable Energy Source

2021 ◽  
Vol 850 (1) ◽  
pp. 012017
Author(s):  
J Shri Saranyaa ◽  
A Peer Fathima ◽  
Asutosh Mishra ◽  
Rushali Ghosh ◽  
Shalmali Das
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Control Method ◽  
Frequency Control ◽  
Renewable Energy Sources ◽  
Optimization Technique ◽  
Optimization Method ◽  
Load Frequency Control ◽  
Load Frequency ◽  
The Individual

Abstract Modern day scenario has an increasing power demand due to the growing development which indeed increases the load on the generation which might cause turbulence in the system and may bounce out of stability. The governor itself can’t handle such frequent load changes and adjust the generation amount to keep the frequency between the margins. This paper proposes an approach towards such predicament to incorporate an optimization method in order to ensure stability of the system despite the drastic changes in demand. Load frequency control is a control method for maintaining the frequency of the system during the change in demand. Use of controllers has proven to be effective in controlling the frequency deviations in the power systems and the response of the controller is further improved using optimization technique for better stability. The PID controller tuned by Particle Swarm Optimization is employed in multi-area system which reduces the time response by a considerable amount and the deviation settles much quicker despite the rapid load changes. The proposed controller is executed further for renewable energy sources connected to the individual areas and demonstration proves that the optimized controller is efficient enough in handling the frequency deviations when wind and solar with sunlight penetration is incorporated.

scholarly journals Irrelevance of inflation: The Dow stocks

2020 ◽  
Vol 9 (1) ◽  
pp. 45
Author(s):  
Samih Antoine Azar
Keyword(s):  
Stock Returns ◽  
Stock Prices ◽  
Price Index ◽  
Inflation Rate ◽  
Long Run ◽  
Price Indexes ◽  
One To One ◽  
The Individual ◽  
Stock Indexes ◽  
Real Assets

The irrelevance of inflation is a proposition, inherited from corporate finance, which states that inflation is irrelevant for the valuation of nominal and real stock prices. In other terms, Net Present Values (NPVs) and stock returns are independent of the inflation rate.  The issue at stake is both theoretical and empirical, although the first came much before the latter. In the empirical realm, stock returns are found to be statistically negatively related to inflation. However, and theoretically, the classical school predicted that they should be related positively one-to-one. Moreover long run analysis, that came later, found that stock prices are positively related to price indexes. This stems from the fact that stocks are claims upon real assets, and, therefore, should be a hedge against inflation with the same one-to-one relation. This paper differs by subjecting all these hypotheses to the individual stocks included in the Dow Jones Industrial Index, and not to returns calculated from stock indexes, which is the usage. The empirical results in this paper support strongly the irrelevance of inflation.  This is true whatever the price index, whatever the econometric procedure, whatever the industry to which the stock belongs, and whatever the specification of the model.  Hence inflation is neither negatively nor positively related to stock returns, whether nominal or real.

Utilitarianism and the Individual

1979 ◽  
Vol 5 ◽  
pp. 47-62 ◽  
Author(s):  
D. H. Monro
Keyword(s):  
Short Answer ◽  
Long Run ◽  
The Individual

Can utilitarianism be reconciled with individualism? The short answer might be that Mill tried to reconcile them, and failed: the quite uncompromising individualism of On Liberty is commonly thought to be inconsistent with his utilitarianism. This is in part because of his rejection of paternalism, which seems to imply that spontaneity and freedom are more valuable than happiness. Mill himself argued that they are, at least in the long run and for the community as a whole, the surest means to happiness. But, while this is defensible, it is hard to see how it could be conclusively demonstrated; and it seems clear that Mill's belief that it is so is the result rather than the cause of his attachment to freedom. Moreover, Mill is, as Fitzjames Stephen pointed out, committed to the assertion that the suppression of opinion always, whatever the circumstances, has worse consequences than not suppressing it; and this seems much too sweeping a principle not to have some exceptions.

Performance Evaluation of Elliptical-Cylindrical Antenna Array using SaDE Optimized Hyper Beam

2017 ◽  
Vol 7 (1) ◽  
pp. 178 ◽  
Author(s):  
Gebrehiwet Gebrekrstos Lema
Keyword(s):  
Communication Systems ◽  
High Performance ◽  
Optimization Technique ◽  
Analytical Techniques ◽  
Side Lobe ◽  
Optimization Techniques ◽  
Side Lobe Level ◽  
Pattern Synthesis ◽  
Improved Performance ◽  
The Individual

<p>For high performance communication systems, Side Lobe Level (SLL) reduction and improved directivity are the goal of antenna designers. In the recent years, many optimization techniques of antenna design are occupying demanding place over the analytical techniques. Though they have contributed attractive solutions, it is often obvious to select one that meets the particular design need at hand. In this paper, an optimization technique called Self-adaptive Differential Evolution (SaDE) that can be able to learn and behave intelligently along with hyper beam forming is integrated to determine an optimal set of excitation weights in the design of EcAA. Non-uniform excitation weights of the individual array elements of EcAA are performed to obtain reduced SLL, high directivity and flexible radiation pattern. To evaluate the improved performance of the proposed SaDE optimized hyper beam, comparison are done with uniformly excited, SaDE without hyper beam and Genetic Algorithm (GA). In general, the proposed work of pattern synthesis has resulted in much better reduction of SLL and FNBW than both the uniformly excited and thinned EcAA. The results of this study clearly reveal that the SLL highly reduced at a very directive beamwidth.</p>

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