The Experts below are selected from a list of 10098 Experts worldwide ranked by ideXlab platform
Yang Xiuxia - One of the best experts on this subject based on the ideXlab platform.
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Quality Assurance Technique for ensuring mechanical properties of casts
Foundry Equipment and Technology, 2011Co-Authors: Yang XiuxiaAbstract:In this paper,a Quality Assurance Technique for ensuring mechanical properties of casts is discussed.This Technique is performed by many steps:rapid chemical analysis to get the components of melted iron,steel,aluminum or copper and mixing and melting programs adjustment according to the results;rapid metallographic analysis to get information of the casts then send to the moulding programs to avoid the disqualified iron melt,aluminum melt,aluminum melt or copper melt moulding into casts.This Quality Assurance Technique ensures the wanted chemical components and metallographic information,so the mechanical proerties and the Quality of the casts are well assured.This Technique realized the presentiment and pre-direction on the whole progress in casts,producing,and ensuring the Quality of casts. This Technique has been used on the practices of making irons and steels such as ZG45,ZGMn 13,ZG40Cr,HT20-40 and QT60-2 and also has been practiced on producing 28 species casts of E514 and Dongfeng5 conbine harvester in steel casting plant and iron casting plant,Siping combine Harvester Corporation.The passing percent of mechanical property of single cast has reached 98%after using this Technique.
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a Quality Assurance Technique for ensuring mechanical properties of casts
Physical Testing and Chemical Analysis, 2007Co-Authors: Yang XiuxiaAbstract:A Quality Assurance Technique for ensuring mechanical properties of casts is discussed.The Technique is performed by many steps including: rapid chemical analysis to get the components of melted iron,steel,aluminum or copper and mixing and melting programs adjustment according to the results;rapid metallographic analysis to get information of the casts then send to the moulding programs to avoid the disqualified iron melt,aluminum melt,aluminum melt or copper melt moulding into casts.The Quality Assurance Technique ensures the wanted chemical components and metallographic information,so the mechanical properties and the Quality of the casts are well assured.The Technique has been used on the practices of making irons and steels,the result shows that the passing percent of mechanical property of single cast has reached 98% after using the Technique.
Vi Tran Ngoc Nha - One of the best experts on this subject based on the ideXlab platform.
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a systematic mapping study on the combination of static and dynamic Quality Assurance Techniques
Information & Software Technology, 2012Co-Authors: Frank Elberzhager, Jurgen Munch, Vi Tran Ngoc NhaAbstract:Context: A lot of different Quality Assurance Techniques exist to ensure high Quality products. However, most often they are applied in isolation. A systematic combination of different static and dynamic Quality Assurance Techniques promises to exploit synergy effects, such as higher defect detection rates or reduced Quality Assurance costs. However, a systematic overview of such combinations and reported evidence about achieving synergy effects with such kinds of combinations is missing. Objective: The main goal of this article is the classification and thematic analysis of existing approaches that combine different static and dynamic Quality Assurance Technique, including reported effects, characteristics, and constraints. The result is an overview of existing approaches and a suitable basis for identifying future research directions. Method: A systematic mapping study was performed by two researchers, focusing on four databases with an initial result set of 2498 articles, covering articles published between 1985 and 2010. Results: In total, 51 articles were selected and classified according to multiple criteria. The two main dimensions of a combination are integration (i.e., the output of one Quality Assurance Technique is used for the second one) and compilation (i.e., different Quality Assurance Techniques are applied to ensure a common goal, but in isolation). The combination of static and dynamic analyses is one of the most common approaches and usually conducted in an integrated manner. With respect to the combination of inspection and testing Techniques, this is done more often in a compiled way than in an integrated way. Conclusion: The results show an increased interest in this topic in recent years, especially with respect to the integration of static and dynamic analyses. Inspection and testing Techniques are currently mostly performed in an isolated manner. The integration of inspection and testing Techniques is a promising research direction for the exploitation of additional synergy effects.
C Liu - One of the best experts on this subject based on the ideXlab platform.
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su g tep4 03 a multileaf collimator calibration and Quality Assurance Technique using an electronic portal imaging device
Medical Physics, 2016Co-Authors: S Lebron, G Yan, C LiuAbstract:Purpose: To develop an accurate and quick multileaf collimator (MLC) calibration and Quality Assurance Technique using an electronic portal imaging device (EPID) Methods: The MLC models used include the MLCi and Agility (Elekta Ltd). This Technique consists of two 22(L)x10(W) cm2 fields with 00 and 1800 collimator angles centered to an offset EPID. The MLC opening is estimated by calculating the profile at the image's center in the image's horizontal direction. Scans in the image's vertical direction were calculated every 20 pixels in the inner 70% of estimated MLC opening. The profiles’ edges were fitted with linear equations to determine the image's rotation angle. Then, crossline profiles were scanned at the center of each leaf taking into account the leaf's width at isocenter and the rotation angle. The profiles’ edges determine the location of the leaves’ edges and these were subtracted from the reference leaf's position in order to determine the relative leaf offsets. The edge location of all profiles was determined by using the parameterized gradient of the penumbra region. The Technique was tested against an established diode array-based method, and for different MLC systems, patterns, gantry angles, days, energies, beam modalities and MLC openings. Results: The differences between the proposed and established methods were 0.26±0.19mm. The leaf offsets’ deviation was <0.3mm (5 months period). For pattern fields, the differences between predetermined and calculated offsets were 0.18±0.18mm. The leaf offset deviation of measurements with different energies and MLC openings were <0.1mm and <0.3mm, respectively. The differences between offsets of FF and FFF beams were 0.01±0.02mm (<0.07mm). The differences between the offsets at different gantry angles were 0.08±0.15mm. Conclusion: The proposed method proved to be accurate and efficient in calculating the relative leaf offsets. Parameterized field edge is essential to obtain accurate result by eliminating the noise from EPID.
Mark A Musenm - One of the best experts on this subject based on the ideXlab platform.
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reasoning based Quality Assurance of medical ontologies a case study
American Medical Informatics Association Annual Symposium, 2014Co-Authors: Matthew Horridge, Bijan Parsia, Natalya F Noy, Mark A MusenmAbstract:The World Health Organisation is using OWL as a key technology to develop ICD-11 - the next version of the well-known International Classification of Diseases. Besides providing better opportunities for data integration and linkages to other well-known ontologies such as SNOMED-CT, one of the main promises of using OWL is that it will enable various forms of automated error checking. In this paper we investigate how automated OWL reasoning, along with a Justification Finding Service can be used as a Quality Assurance Technique for the development of large and complex ontologies such as ICD-11. Using the International Classification of Traditional Medicine (ICTM) - Chapter 24 of ICD-11 - as a case study, and an expert panel of knowledge engineers, we reveal the kinds of problems that can occur, how they can be detected, and how they can be fixed. Specifically, we found that a logically inconsistent version of the ICTM ontology could be repaired using justifications (minimal entailing subsets of an ontology). Although over 600 justifications for the inconsistency were initially computed, we found that there were three main manageable patterns or categories of justifications involving TBox and ABox axioms. These categories represented meaningful domain errors to an expert panel of ICTM project knowledge engineers, who were able to use them to successfully determine the axioms that needed to be revised in order to fix the problem. All members of the expert panel agreed that the approach was useful for debugging and ensuring the Quality of ICTM.
Frank Elberzhager - One of the best experts on this subject based on the ideXlab platform.
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a systematic mapping study on the combination of static and dynamic Quality Assurance Techniques
Information & Software Technology, 2012Co-Authors: Frank Elberzhager, Jurgen Munch, Vi Tran Ngoc NhaAbstract:Context: A lot of different Quality Assurance Techniques exist to ensure high Quality products. However, most often they are applied in isolation. A systematic combination of different static and dynamic Quality Assurance Techniques promises to exploit synergy effects, such as higher defect detection rates or reduced Quality Assurance costs. However, a systematic overview of such combinations and reported evidence about achieving synergy effects with such kinds of combinations is missing. Objective: The main goal of this article is the classification and thematic analysis of existing approaches that combine different static and dynamic Quality Assurance Technique, including reported effects, characteristics, and constraints. The result is an overview of existing approaches and a suitable basis for identifying future research directions. Method: A systematic mapping study was performed by two researchers, focusing on four databases with an initial result set of 2498 articles, covering articles published between 1985 and 2010. Results: In total, 51 articles were selected and classified according to multiple criteria. The two main dimensions of a combination are integration (i.e., the output of one Quality Assurance Technique is used for the second one) and compilation (i.e., different Quality Assurance Techniques are applied to ensure a common goal, but in isolation). The combination of static and dynamic analyses is one of the most common approaches and usually conducted in an integrated manner. With respect to the combination of inspection and testing Techniques, this is done more often in a compiled way than in an integrated way. Conclusion: The results show an increased interest in this topic in recent years, especially with respect to the integration of static and dynamic analyses. Inspection and testing Techniques are currently mostly performed in an isolated manner. The integration of inspection and testing Techniques is a promising research direction for the exploitation of additional synergy effects.
