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Article
Publication date: 1 December 2004

Bahattin Koc

A new surface error calculation method for layered manufacturing processes is proposed in this paper. The developed method is used to generate the layers by adaptively…

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1053

Abstract

A new surface error calculation method for layered manufacturing processes is proposed in this paper. The developed method is used to generate the layers by adaptively varying the thickness of the layers based on the surface approximation errors. Traditionally, the surface errors are calculated using local approximation techniques. In this paper, the surface approximation errors are calculated more accurately by marching through the surface points and determining the distances between layers and the surface points. Using the calculated distances, the adaptive layers are generated for both traditional two‐dimensional layer and ruled‐layer approximation methods. It has been shown that layered manufacturing (rapid prototyping) processes can achieve better accuracy and efficiency using the proposed surface error calculation and the adaptive ruled layer approximation methods. Computer implementation and illustrative examples are also presented in this paper.

Details

Rapid Prototyping Journal, vol. 10 no. 5
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 18 January 2008

Aditya Kelkar and Bahattin Koc

The objective of this paper is to develop geometric algorithms and planning strategies to enable the development of a novel hybrid manufacturing process, which combines…

Abstract

Purpose

The objective of this paper is to develop geometric algorithms and planning strategies to enable the development of a novel hybrid manufacturing process, which combines rapidly re‐configurable mold tooling and multi‐axis machining.

Design/methodology/approach

The presented hybrid process combines advantages of both reconfigurable molding and machining processes. The mold's re‐configurability is based on the concept of using an array of discrete pins. By positioning the pins, the reconfigurable molding process allows forming the mold cavity directly from the object's 3D design model, without any human intervention. After a segment of the part is molded using the reconfigurable molding process, a multi‐axis machining operation is used to create accurate parts with better surface finish. Geometric algorithms are developed to decompose the design model into segments based on the part's moldability and machinability. The decomposed features are used for planning the reconfigurable molding and the multi‐axis machining operations.

Findings

Computer implementation and illustrative examples are also presented in this paper. The results showed that the developed algorithms enable the proposed hybrid re‐configurable molding and multi‐axis machining process. The developed decomposition and planning algorithms are used for planning the reconfigurable molding and the multi‐axis machining operations. Owing to the decomposition strategy, more geometrically complex parts can be fabricated using the developed hybrid process.

Originality/value

This paper presents geometric analysis and planning to enable the development of a novel hybrid manufacturing process, which combines rapidly re‐configurable mold tooling and multi‐axis machining. It is expected that the proposed hybrid manufacturing process can produce highly customized parts with better surface finish, and part accuracy, with shorter build times, and reduced setup and tooling costs.

Details

Rapid Prototyping Journal, vol. 14 no. 1
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 1 September 2000

Bahattin Koc, Yawei Ma and Yuan‐Shin Lee

Presents a method of Max‐Fit biarc curve fitting technique to improve the accuracy of STL files and to reduce the file size for rapid prototyping. STL file has been widely…

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1332

Abstract

Presents a method of Max‐Fit biarc curve fitting technique to improve the accuracy of STL files and to reduce the file size for rapid prototyping. STL file has been widely accepted as a de facto standard file format for the rapid prototyping industry. However, STL format is an approximated representation of a true solid/surface model, and a huge amount of STL data is needed to provide sufficient accuracy for rapid prototyping. Presents a Max‐Fit biarc curve fitting technique to reconstruct STL slicing data for rapid prototyping. The Max‐Fit algorithm progresses through the STL slicing intersection points to find the most efficient biarc curve fitting, while improving the accuracy. Our results show that the proposed biarc curve‐fitting technique can significantly improve the accuracy of poorly generated STL files by smoothing the intersection points for rapid prototyping. Therefore, less strict requirements (i.e. loose triangle tolerances) can be used while generating the STL files.

Details

Rapid Prototyping Journal, vol. 6 no. 3
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 1 November 2003

Murat Kasimoglu and Bahattin Hamarat

Competition and attempts to increase market share between organizations play an important role in business ecology. It has been determined that intensity in the…

Abstract

Competition and attempts to increase market share between organizations play an important role in business ecology. It has been determined that intensity in the institutions and death among organizations especially are of great importance. Intensity and homogeny among the organizational population are very important in the evolutionary process for them to create modern forms of institution. We have used parametric variables to collect a set of data in order to understand competition and niche among organization population. The study investigates how competition and niche affect the cluster of hotel population and their survivability. The founding of each hotel organization is differently constructed internally and different segments of the hotel population respond heterogeneously to the general process of competition. The findings show how niche and different segments of hotel population affect new organizational establishment and the evolutionary dynamics of modern organization structure, using the city center hotels of Canakkale in Turkey.

Details

Management Research News, vol. 26 no. 8
Type: Research Article
ISSN: 0140-9174

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Article
Publication date: 27 April 2010

Attila Yaprak and Bahattin Karademir

The purpose of this paper is to review the extant literature on the institutional, market‐centered, and the resource‐based perspectives on the internationalization of BGs…

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7396

Abstract

Purpose

The purpose of this paper is to review the extant literature on the institutional, market‐centered, and the resource‐based perspectives on the internationalization of BGs in emerging markets; to suggest that business group affiliation is an important ingredient in the internationalization of emerging market MNCs; and to offer examples of internationalization from one emerging market, Turkey.

Design/methodology/approach

This is a critical literature review integrating two strands of literature, the institutional, market‐centered and resource‐based theories of internationalization and the OLI and the LLL models of emerging market multinationals' international expansion.

Findings

The theorizing indicates that an integrated theoretical approach should lead to a better understanding of emerging market business group affiliates' internationalization.

Research limitations/implications

As a literature integration paper, the paper is limited in its practical implications.

Originality/value

The paper is a critical literature review and is likely to lead to testable hypotheses about the internationalization of business group affiliates from emerging markets.

Details

International Marketing Review, vol. 27 no. 2
Type: Research Article
ISSN: 0265-1335

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Book part
Publication date: 27 November 2006

Attila Yaprak, Bahattin Karademir and Richard N. Osborn

Business groups have become a significant phenomenon in the evolution and functioning of emerging markets. They also provide important partnership opportunities to foreign…

Abstract

Business groups have become a significant phenomenon in the evolution and functioning of emerging markets. They also provide important partnership opportunities to foreign firms when they enter these markets. Yet, business groups have not received sufficient attention in the international marketing literature. In this paper, we provide an overview of the theories that explain how business groups function and evolve in emerging markets and generate propositions from that theory. We also present evidence on business group evolution from one emerging market, Turkey. Our work should inspire research questions for future study.

Details

International Marketing Research
Type: Book
ISBN: 978-0-76231-369-3

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