Local search for the surgery admission planning problem

We present a model for the surgery admission planning problem, and a meta-heuristic algorithm for solving it. The problem involves assigning operating rooms and dates to a set of elective surgeries, as well as scheduling the surgeries of each day and room. Simultaneously, a schedule is created for each surgeon to avoid double bookings. The presented algorithm uses simple Relocate and Two-Exchange neighbourhoods, governed by an iterated local search framework. The problem's search space associated with these move operators is analysed for three typical fitness surfaces, representing different compromises between patient waiting time, surgeon overtime, and waiting time for children in the morning on the day of surgery. The analysis shows that for the same problem instances, the different objectives give fitness surfaces with quite different characteristics. We present computational results for a set of benchmarks that are based on the admission planning problem in a chosen Norwegian hospital

Solar radiation on Adana, Turkey

Measured monthly mean daily global radiation data for Adana (Lat. 37° 00' N, Long. 35° 20' E) has been used for estimating global horizontal solar-radiation. Hourly global, diffuse and direct solar-radiations on a horizontal surface in Adana have been determined. © 2002 Elsevier Science Ltd. All rights reserved

Solar radiation on Adana, Turkey

Measured monthly mean daily global radiation data for Adana (Lat. 37° 00' N, Long. 35° 20' E) has been used for estimating global horizontal solar-radiation. Hourly global, diffuse and direct solar-radiations on a horizontal surface in Adana have been determined.Solar radiation Diffuse and direct radiation Clearness index Horizontal surface Adana

Taguchi approach for the optimisation of the bursting strength of knitted fabrics

In this paper, the bursting strength of knitted fabrics was optimised using the Taguchi experiment design technique, which is a recently famous approach. In the evaluations, analyses of variance (ANOVA) and the signal to noise ratio were used. 9 experiments were performed with respect to the L9 orthogonal design for the Taguchi approach. The results show a considerable improvement in the S/N ratio as compared to the initial condition. With the Taguchi processes, we can easily determine optimum conditions for maximising the bursting strength of knitted fabrics with simple experiments

Investigation of effects of repeated laundering on the knitted fabrics with biopolishing treatment [Biyoparlatma uygulanmiş örme kumaşlara tekrarli (çoklu) yikamalarin etkisinin incelenmesi]

The purpose of this research was to investigate the effects of repeated laundering on the knitted fabrics with biopolishing treatment. The fabric samples were subjected to laundering process in a domestic washing machine following 10 and 20 times. With respect to the experimental results, maximal dimensional variations were determined after ten laundering cycles. Increasing laundering cycles decreased the fabric bursting strength and pilling values, but increased some deformations on fabrics surface

Total porosity, theoretical analysis, and prediction of the air permeability of woven fabrics

Air permeability is one of the most important properties of textile materials that ensure their comfort. For many materials for technical applications (filters, sails, vacuum cleaners, parachutes, etc.), this is one of the main properties that determine their quality. The air permeability of woven textile fabrics depends on many parameters of fabric. Thus, the determination of air permeability of woven fabric is highly complex and difficult. In this study, we attempted to establish a theoretical model for the porosity and predicted the air permeability of woven fabrics. A theoretical model was created to predict the total porosity and the air permeability of a fabric structure depending on the geometrical parameters such as pore size, warp density, weft density, fabric thickness, number of yarn, diameter of yarn, and fiber density. For the purpose, a theoretical model of porous systems on D'Arcy's law was used, and the validity of the model was confirmed by experimental results using 100% cotton and 97/3 cotton/lycra woven fabrics. Since the amount of air passing through both the pores between yarns and the interstices in the fibers constituting the yarn structure was calculated, theoretical values of air permeability were obtained very close to the experimental values. © 2012 Copyright The Textile Institute

Optimization of bursting strength of single jersey fabrics with taguchi orthogonal design [Süprem kumaşlarda patlama mukavemeti degerinin taguchi ortogonal dizayna göre optimizasyonu]

In this study, it was aimed to optimize the bursting strength of single jersey fabrics with Taguchi orthogonal design. The experiments were performed by using L9 orthogonal matrix with respect to Taguchi approach. Analysis of variance (ANOVA) and signal/noise ratio were used to evaluate the experiment results. in the case of full factorial design, it is necessary to perform 27 experiments to find out the optimum configuration but by using Taguchi approach, this was lower to 9 experiments

The current situation and development of textile industry and apparel industry in Turkey [Türk tekstil ve hazir giyim sanayiinin mevcut durumu ve gelişimi]

The industry sector of textile and clothing has an important role in the economical development of Turkey.Export of textile and clothing increased to 602 billion dollar in 2010 from 526 billion dollar in 2009 as indicated by World Trade Organisation. The share of textiles and clothing in world trade of 2010 became 4,1% and Turkey has 3,6% share in world trade of textile and clothing.Textile and clothing industry is placed near the top in terms of parameters such as its share in GNP, foreign trade potential, employment in Turkey and has been increased to first rows in global trades. Turkey is between the best competitive countries of the World with China, India and South Korea considering labor force, raw material and marketing factors.The developments in textile and clothing industry sectors have unavoidable effect on all of Turkish economy because of their very strong connections within the country's economic dynamics. The sustainability of the power of these sectors has high importance under such global competitive circumstances when positive contributions of competitor countries are considered.In this study, the current situation of textile sector and clothing sector in Turkey is demonstrated with updated statistical information considering also historical developments of these sectors

Investigation of porosity and air permeability values of plain knitted fabrics

The air permeability of a fabric is defined as the amount of air passed over a surface under a certain pressure difference in a unit time. This value has significance with respect to the usage area. Since knitted fabrics have a loop structure, they have more pores than woven fabrics; therefore, in general, the air permeability of knitted fabrics is higher than that of woven fabrics of the same weight. An experiment to determine the air permeability is very important as it defines the properties of keeping warm, protection against the wind, breathability etc. of knitted fabrics used as clothing. In this study, it has been attempted to establish a theoretical model for the porosity and predicted air permeability of plain knitted fabrics. A theoretical model was created to predict the porosity and air permeability of a knitted structure depending on the geometrical parameters, such as the courses per cm, wales per cm, stitch length, fabric thickness, yarn count, diameter of yarn and fiber density. For this purpose, a theoretical model of porous systems based on D'Arcy's law was used, the validity of which was confirmed by experimental results using 100% cotton plain knitted fabrics produced from ring and compact yarns of different yarn number linear density and tightness