Volume 6 - 2015

Experimental Validation of Change of Volume in Pneumatic Artificial Muscle during Excitation (pp. 1-6)

Miha Pipan
The majority of pneumatic artificial muscles (PAMs) models for calculating generated force with virtual work are good approximations. These models usually do nottake into account the edge deformations of the muscle orthe elastic deformations of the muscle bladder as a function of different internal pressure of the muscle, but only the contraction of the muscle. This paper presents the method that enables us to accurately measure the change in pneumatic muscle volume. Experimental results are compared with the standard Chou model. Also, further improvement of the PAM model is suggested.

 

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A Model for Ranking and Optimization of Key Performance Indicators of the Strategy Process (pp. 7-14)

Marija Gacic, Snezana Nestic, Marija Djordjevic Zahar, Miladin Stefanovic
Small and medium sized companies are faced with a series of challenges in order to improve the quality of their key business processes. Quality management system and the requirements of ISO 9001:2008 are usually reliable when defining the key performance indicators of processes, and the process approach enables monitoring of the process indicators’ effectiveness for the whole organization. Evaluation, monitoring and ranking of key performance indicators can provide quality improvement of strategy process performance in different SMEs. A model based on genetic algorithms has been developed in order to rank key performance indicators of the strategy process. This model can have a great practical use for a company’s management team in the quality assessment of strategy process performance in their company.

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Influence of Solid Particles as a Contaminants on Degradation Processes in Hydraulic Components or Systems (pp. 15-20)

Velibor Karanovic, Mitar Jocanovic, Milan Delic
Authors of numerous papers in the field of testing and maintenance of hydraulic equipment, show that solid particles have the most destructive influence than other contaminants. Their biggest influence are on wearing processes of components with smallest gaps (1-10 um) such as pumps with or without flow regulation, proportional and servo-valves. Except wearing processes, depending on size and concentration, solid particles can cause flow blockage trough small size flow passages (orifices, flow regulators) but also physical and chemical degradation processes of hydraulic oil. This paper presents some of degradation processes which are direct consequence of inapropriate solid particle presence, and results of tests conducted under different working conditions to evaluate influence of particles on a degradation of contacting valve surfaces.

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A Model for Analyzing and Measuring the Performance of Industrial Enterprises (pp. 21-28)

Milos Tomic, Zdravko Tesic, Bogdan Kuzmanovic, Ivana Tomic
This research has attempted to use tool for action plan selection (TAPS) software, analytic hierarchy process (AHP) software and to use new developed software for defining performance indicators and how it could be used by managers to construct a performance measurement system. In this research, we used a process model of the organization, suitable for displaying a combination of input, process and output measures. Besides, new software for data collection, analysis and visualization of key performance indicators and their impact on the performance of the firm performance is developed. The empirical part of study is based on thirty interviews from ten case manufacturing and service organizations.

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Utilizing Customer Experience Management Framework to Create a Delightful Service Experience (pp. 29-42)

Ronald Sukwadi
In a highly competitive service environment, service providers have to provide customers with delightful service experience in order to attract more customers and achieve higher customer satisfaction. Managing service experience is a critical approach for service providers to consider. Although customer experience management (CEM) has been discussed across different research disciplines, there is still no systematical and feasible way to apply CEM into real environments. This study attempts to examine the customer experience by using cluster analysis, cross tabulation test, importance-satisfaction (IS) model, and house of quality (HOQ) method for CEM. We illustrate the process using an empirical case study at a well-known café in Jakarta, Indonesia. This mechanism can help service providers design and deliver delightful service experience to customers.

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Design, Control and Application of Quadcopter (pp. 43-48)

Gordana Ostojic, Stevan Stankovski, Branislav Tejic, Nikola Djukic, Srdjan Tegeltija
Quadcopter is an unmanned aerial vehicle, which can be implemented in different applications. In paper it will be represented a development of a quadcopter system and potential application in which it can be implemented. Quadcopter structure model, basic components with block diagram, hovering stability, dimensions, and description of basic movements will be represented and discussed. Control algorithms with steps in empirical methodology will also be presented. Current civil and military application will be examined, and future applications will be suggested.

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A Metaheuristic ACO to Solve the Multi-Depot Vehicle Routing Problem with Backhauls (pp. 49-58)

Jhon Jairo Santa Chávez, Mauricio Granada Echeverri, John Willmer Escobar, César Augusto Peñuela Meneses
In this paper, a metaheuristic algorithm based on the ant colony optimization is presented to solve the multi-depot vehicle routing problem with delivery and collection of package. Each performed route consists of one sub-route in which only the delivery task is done, in addition to one sub-route in which only the collection process is performed. The proposed algorithm tries to find the best order to visit the customers at each performed route. In addition, the proposed approach determines the best connection between the sub-routes of delivery and collection, in order to obtain a global solution with the minimum travelling cost. The efficiency of the proposed algorithm has been evaluated by considering a set of instances adapted from the literature. The computational results have been compared with a greedy heuristic algorithm based on the nearest neighborhood approach. Finally, conclusions and suggestions for future works are presented.

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Growth Patterns of Small Manufacturing Firms Before Failure: Interconnections with Financial Ratios and Nonfinancial Variables (pp. 59-66)

Oliver Lukason, Erkki K. Laitinen, Arto Suvas
This study focuses on the pre-failure growth in total assets, debt and sales of bankrupted manufacturing firms. Based on a sample of 128 Estonian firms, it is shown that two distinct growth patterns can be outlined. When the first pattern shows a gradual decline, then the other characterizes a more eclectic growth behavior. Several classical financial ratios have significantly different values through the established two patterns. Managers’ characteristics do not vary among the established patterns.

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An Investigation of Container Loading Problem Dealing with Irregular Shape Shipment (pp. 67-74)

Xinyue Chang, Haiyan H Zhang
Container loading problem (CLP) is a category of problems that describing the scenarios of packing shipments into containers. It has been discussed in the fields of logistics, industrial engineering, transportation (civil) engineering, and operational management for many years. However, handling irregular shape shipment was not been investigated in-depth, such as algorithms of overlap searching, schemes of placing items, real world constraints, and damage control. This paper is dedicated to investigate and understanding the complexity and difficulties of the CLP involving irregular shape shipment, especially when closely related to industrial conditions. Beyond the previous works, the problem statement in this paper is formed with the idea of reflecting the real world scenarios and illuminating future research direction. In order to maximize the benefit of this paper to the industries, multiple methods and candidates are proposed that are collected from other fields. This paper includes overview of the factors related to irregular shape CLP that is worthy to concern while working on the next generation of great CLP approaches, particularly in handling irregular shape shipments.

 

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Creating PRODUCTIVE Workers in Industrial Context from the Definition of Thermal Comfort (pp. 75-84)

Mariana Morgado, Leonor Teixeira, Mário Talaia
The human action among environment concerns and countries development is being debated by several authors. Thermal comfort is an extremely broad concept directly related to ergonomics, energy buildings consumption and workers’ performance. The present paper intends to analyse the thermal environment inside of a Portuguese manufacturing metalworking industry in order to understand its influence in worker’s performance and well-being. For this purpose, two types of studies were conducted: analytical and empirical. The analytical exploration regards the indoor thermal environment study concerning two thermal indexes: EsConTer and THI. The empirical exploration consists in workers’ thermal sensation study, regarding a thermal colour scale based in ASHRAE seven-point thermal scale. Therefore a measuring instrument was used, ‘Testo 435-4’, to collect air temperature (oC), air relative humidity (%) and wet bulb temperature (oC) data. The EsConTer index was the most surprising applied method since it showed itself capable to describe the thermal environment of an industrial space due to its correlation with THI, and at the same time adequate to define workers’ thermal sensation. Moreover, the authors consider thermal environment studies in workplaces an important aspect to improve the productivity of workers in business contexts.

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