Yazar "Akkoyun, Ozgur" seçeneğine göre listele

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    Cost of quality management: An empirical study from Turkish marble industry
    (Academic Journals, 2009) Akkoyun, Ozgur; Ankara, Huseyin
    In this study, a quality cost model to measure and control costs of quality (COQ) occurring in marble plants was developed. In the marble industry, most properties associated with quality depend on uncontrolled and mostly immeasurable natural and geological conditions. And because of these nature-related problems, it is difficult to apply commonly used quality cost models to the marble industry and there has not been any application of cost models to the marble industry in literature. For the first time, quality costs occurring in marble production systems are determined, classified and calculated. A computer program containing this model and statistical quality control tools was developed. The software was tested using data from marble plants located in the Diyarbakir (Turkey) Region that has a significant share of the Turkish natural stone industry. It was found that quality costs vary depending on product types in range from 9 to 34% of total production costs for three different stone types.
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    Investigation of blast-induced ground vibration effects on rural buildings
    (Techno-Press, 2015) Oncu, Mehmet Emin; Yon, Burak; Akkoyun, Ozgur; Taskiran, Taha
    In this paper, blast-induced vibration effects on buildings located in rural areas were investigated. Damages to reinforced concrete, adobe and masonry buildings were evaluated in Catakkopru and Susuz villages in Silvan district of Diyarbakir, Turkey. Blasting of stiff rocks to construct highway at vicinity of the villages damaged the buildings seriously. The most important reason of the damages is lack of engineering services and improper constructed buildings according to the current building design codes. Also, it is determined that, inappropriate blast method and soft soil class increased the damages to the buildings. The study focuses on four points: Blast effect on buildings, soil conditions in villages, building damages and evaluation of damage reasons according to the current Turkish Earthquake Code (TEC).
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    An Investigation of Colour Properties of Orosei Limestones (Italy) by Using Computer Program
    (Trans Tech Publications Ltd, 2013) Akkoyun, Ozgur; Careddu, Nicola; Marras, Graziella
    In this study, a new computer program developed to determine the colour properties of natural stone products is introduced. The program can scan any digitalised picture of natural stone products and produce several statistical results such as mean, variance, minimum and maximum colour values, skewness and kurtosis values of the colour histogram, energy, contrast, entropy and homogeneity values of the data which may be used to classify the typology and/or quality of natural stone products. As a case study, Orosei limestones (Sardegna, Italy) were used. There are several typologies of Orosei limestones such as Nuvolato (Cloudy), Venato chiaro (Light Veined), Venato medio (Medium Veined), Venato scuro (Dark Veined), Perlato chiaro (Light Pearled), Perlato medio (Medium Pearled) and Perlato scuro (Dark Pearled). The remarkable results produced by the program are presented.
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    Simulation-based investment appraisal and risk analysis of natural building stone deposits
    (Elsevier Sci Ltd, 2012) Akkoyun, Ozgur
    In this study, investment appraisal techniques and risk analysis methods are evaluated and a new simulation-based computer program developed for helping investment appraisal applications for natural building stone deposits is introduced. Finally, case study and its results are presented. The study proved that simulation programs can be used for decision making concerning potential investments in NBS deposits. (C) 2012 Elsevier Ltd. All rights reserved.
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    Technical-economic assessment of stone slabs surface finishing using water jet technology
    (Springer London Ltd, 2014) Careddu, Nicola; Akkoyun, Ozgur; Medda, Pierpaolo; Tilocca, Caterina
    This paper examines, from an economic standpoint, some of the surface finishing results achieved for stone slabs using high pressure water jets. The results of both the management accounting method and a technical and economic cost analysis method are here applied. The latter method is specifically aimed at verifying and fine-tuning the management analysis model based on the technical coefficient matrix. The second method proposed allows one to examine each process in detail and easily determine technical-economic models for planning, processing and management. The type of production cost analysis proposed here is original, rigorous and precise. The fact that it captures all the most significant technical aspects of the process and clarifies their economic implications makes it far more preferable to the traditional final accounts analyses. Moreover, this technical and economic cost analysis method allows one to accurately calculate the unit cost of each product.