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Article

Nithya R.P. and Haridass M.

The purpose of this paper is to provide simulation modelling for bulk arrival bulk service queueing system involved in a textile industry and analyze the performance metrics.

Abstract

Purpose

The purpose of this paper is to provide simulation modelling for bulk arrival bulk service queueing system involved in a textile industry and analyze the performance metrics.

Design/methodology/approach

This paper describes the simulation modelling of a bulk queueing system with limited number of admissions and multiple vacations. The model is developed for the proposed queueing system using Flexsim 2017, and it is explained through an application observed in a textile industry involving the process of cone winding.

Findings

In this paper, the simulation model has been developed to study the behaviour of queues at different resources in a production system. Various performance measures such as average components, average waiting time, total number of inputs and outputs, processing time and idle time involved in a textile industry are evaluated using simulation and justified through numerical illustration.

Practical implications

The proposed simulation model may be used in various scenarios wherever a real time situation exists related to bulk queueing system. The results produced in this paper can be used by the manufacturing industries to enhance the need-based accuracy. It is worth pointing out that the findings are of direct practical relevance and can be successfully used for a number of industrial applications.

Originality/value

The approach suggested in this paper attempts to deal with the queueing system involved in a textile industry and provides numerical results in less time with less computer resources. It provides a reasonably good approximation for simple and complex queueing models where it is difficult to find closed form of theoretical results.

Details

Kybernetes, vol. 50 no. 2
Type: Research Article
ISSN: 0368-492X

Keywords

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Article

Eric Alfredo Rincón-García, Miguel Ángel Gutiérrez-Andrade, Sergio Gerardo de-los-Cobos-Silva, Roman Anselmo Mora-Gutiérrez, Antonin Ponsich and Pedro Lara-Velázquez

This paper aims to propose comparing the performance of three algorithms based on different population-based heuristics, particle swarm optimization (PSO), artificial bee…

Abstract

Purpose

This paper aims to propose comparing the performance of three algorithms based on different population-based heuristics, particle swarm optimization (PSO), artificial bee colony (ABC) and method of musical composition (DMMC), for the districting problem.

Design/methodology/approach

In order to compare the performance of the proposed algorithms, they were tested on eight instances drawn from the Mexican electoral institute database, and their respective performance levels were compared. In addition, a simulated annealing-based (simulated annealing – SA) algorithm was used as reference to evaluate the proposed algorithms. This technique was included in this work because it has been used for Federal districting in Mexico since 1994. The performance of the algorithms was evaluated in terms of the quality of the approximated Pareto front and efficiency. Regarding solution quality, convergence and dispersion of the resulting non-dominated solutions were evaluated.

Findings

The results show that the quality and diversification of non-dominated solutions generated by population-based algorithms are better than those produced by Federal Electoral Institute’s (IFE’s) SA-based technique. More accurately, among population-based techniques, discrete adaptation of ABC and MMC outperform PSO.

Originality/value

The performance of three population-based techniques was evaluated for the districting problem. In this paper, the authors used the objective function proposed by the Mexican IFE, a weight aggregation function that seeks for a districting plan that represents the best balance between population equality and compactness. However, the weighting factors can be modified by political agreements; thus, the authors decided to produce a set of efficient solutions, using different weighting factors for the computational experiments. This way, the best algorithm will produce high quality solutions no matter the weighting factors used for a real districting process. The computational experiments proved that the proposed artificial bee colony and method of musical composition-based algorithms produce better quality efficient solutions than its counterparts. These results show that population-based algorithms can outperform traditional local search strategies. Besides, as far as we know, this is the first time that the method of musical composition is used for this kind of problems.

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Article

Franciszek Balik

The purpose of this paper is to present a new method of optimization of electronic integrated circuits (IC) with imbedded passive modules (PM). The reported method…

Abstract

Purpose

The purpose of this paper is to present a new method of optimization of electronic integrated circuits (IC) with imbedded passive modules (PM). The reported method constitutes an attempt to streamline the optimization process in the AC electrical model stage of the RF Microsystems design.

Design/methodology/approach

In this method, the PM are described in symbolic form while the IC blocks remain described numerically. Whole PM can be represented as some sequence of expressions containing crucial model parameters, nominal and parasitic, which are first precompiled and next, merged automatically with the main program.

Findings

The input data can be updated online according to the user's desiderata. Further, the system offers the possibility to optimize PM in diverse circumstances as well as using different technologies, and including parasitic effects.

Originality/value

Usage of the semi‐symbolic method for IC with embedded PM optimization based on large‐change sensitivity AC analysis method, which appears to be a very efficient and flexible approach to solving such problems.

Details

Microelectronics International, vol. 28 no. 3
Type: Research Article
ISSN: 1356-5362

Keywords

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Article

Yafu Lin, Guohui Huang, Yong Huang, Tzuen‐Rong Jeremy Tzeng and Douglas Chrisey

The purpose of this paper is to study the effect of laser fluence on the post‐transfer cell viability of human colon cancer cells (HT‐29) during a typical biofabrication…

Abstract

Purpose

The purpose of this paper is to study the effect of laser fluence on the post‐transfer cell viability of human colon cancer cells (HT‐29) during a typical biofabrication process, matrix‐assisted pulsed‐laser evaporation direct‐write (MAPLE DW).

Design/methodology/approach

The post‐transfer cell viability in MAPLE DW depends on various operation conditions such as the applied laser fluence. HT‐29 cell was selected as a model mammalian cell to investigate the effect of laser fluence on the post‐transfer cell viability. MAPLE DW‐based HT‐29 cell direct writing was implemented using an ArF excimer laser under a wide range of laser fluence. Trypan blue dye‐exclusion was used to test the post‐transfer cell viability.

Findings

It has been observed that: the HT‐29 cell viability decreases from 95 to 78 percent as the laser fluence increases from 258 to 1,482 mJ/cm2; and cell injury in this study is mainly due to the process‐induced mechanical stress during the cell droplet formation and landing processes while the effects of thermal influence and ultraviolet radiation are below the level of detection.

Research limitations/implications

This paper reveals some interesting relationships between the laser fluence and the post‐transfer mammalian cell viability and injury, and the resulting knowledge of these process‐related relationships helps the wide implementation of MAPLE DW‐based biofabrication. Post‐transfer cell injury reversibility and cell proliferation capacity need to be further elucidated.

Practical implications

This paper will help the wide implementation of cell direct‐write technologies including MAPLE DW to fabricate biological constructs as artificial tissues/organs and bio‐sensing devices.

Originality/value

The shortage of donor organs and the need of various bio‐sensing devices have significantly prompted the development of various biological material‐based direct‐write technologies. Process‐induced cell injury happens during fabricating of biological constructs using different direct‐write technologies including MAPLE DW. The post‐transfer cell viability is a key index to evaluate the feasibility and efficiency of any biofabrication technique. This paper has investigated the effect of laser fluence on the post‐transfer HT‐29 cell viability and injury. The knowledge from this study will help effectively and efficiently fabricate various biological constructs for organ printing and biosensor fabrication applications.

Details

Rapid Prototyping Journal, vol. 16 no. 3
Type: Research Article
ISSN: 1355-2546

Keywords

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