Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 106 for “"Varian"”.
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Assessment of imaging dose from the kilovoltage cone beam computed tomography system on board the Varian Halcyon linear accelerator
… treatment using advanced techniques on the Varian Halcyon linear accelerator for setup verification, correction, and adaptation of the treatment plan. The frequent nature of imaging sessions mostly using kilovoltage (kV) x-ray energies has raised concerns about the contribution of low-energy …
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A high speed data link
Work done on a Varian 6201 computer in the field of automation and control showed the need for high-speed data terminals that would extend the use of the Varian to remote processes.
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Operational improvement at a mass customization semiconductor equipment manufacturing facility through inventory consolidation
… thesis addresses the operational improvement at Varian Semiconductor Equipment and Associates (Varian), a subsidiary of Applied Materials (AMAT), through material shortage reduction. Varian manufactures highly customized implantation equipment. Sub-assemblies that form an implantation tool are …
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Instruments and Domains of Knowledge: The Case of Nuclear Magnetic Resonance Spectroscopy, 1956-1969
… to 1969 to understand how organic chemists and Varian Associates?the makers of the first commercial NMR spectrometers?negotiated the identity of the NMR spectrometer. The work of the organic chemists was examined through their publications in the JOC. Examining the abstracts from the JOC between …
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Operations improvement in a semiconductor capital equipment manufacturing plant : resource optimization, labor flexibility, and inventory management
… thesis draws heavily on the research done at Varian Semiconductor Equipment, a manufacturer of ion implantation machines for the semiconductor industry, over a period of seven months as part of the Master of Engineering in Manufacturing program at the Massachusetts Institute of Technology and …
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Restructuring inventory location at semiconductor equipment manufacturing plant
… Supermarket (SMKT) material shortage problem at Varian Semiconductor Equipment and Associates (Varian), in a bid to improve the SMKTs On-Time Delivery. The SMKT is a sub-assembly area that creates intermediate assemblies in a multi-stage ion implanter production process. However, many sub- …
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Operations improvement in a semiconductor capital equipment manufacturing plant : component level and assembly level inventory management
… in a high-mix and low-volume environment at Varian Semiconductor Equipment business unit of Applied Materials. Due to the demand growth over the past years, Varian has been continuously improving its operations practices to increase the factory capacity without investing additional floor …
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Quality improvement at a semiconductor equipment manufacturing facility through error re-categorization and proper inventory management
… of first pass yield on the assembly floor of Varian Semiconductor Equipment and Associates (Varian) - a low volume complex semiconductor capital equipment manufacturing facility. First pass yield refers to the proportion of fully built modules that pass testing without the need for additional …
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Benchmarking and Implementation of A New Independent Monte Carlo Dose Calculation Quality Assurance Audit to ol For Clinical Trials
… A multi-source model representing output for Varian 6 MV and 10 MV photon beams was developed and evaluated. The Monte Carlo algorithm, know as the Dose Planning Method (DPM), was used to perform the dose calculations. The dose calculations were compared to measurements made in a water phantom …
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Development of A New Independent Monte Carlo Dose Calculation Quality Assurance Audit to ol For Clinical Trials
… the output of Elekta 6MV and 10MV and Varian TrueBeam Flattening Filter Free (FFF) 6MV and FFF 10MV therapeutic x-ray beams were developed. The Monte Carlo technique, using the Dose Planning Method (DPM) algorithm, was used in radiation dose calculations. During validation calculations …
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Lean manufacturing in a mass customization plant : improvement of Kanban policy and implementation
… lean manufacturing and supply chain planning at Varian Semiconductor Equipment Associates. Varian is a manufacturer of ion implantation machines, and supplies and services equipment for most of the leading semiconductor manufacturers. The demand for the company's products is uncertain. The …
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Applications of cone beam computed tomography in radiotherapy treatment planning.
… to reconstructed images obtained using the Varian OBI system software. The images are free of crescent artifacts and showed a maximum spatial resolution of 7 line pairs/cm. The effect of different reconstruction filters on CBCT image quality was also studied and guidelines were produced for …
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On-time delivery improvement at a semiconductor equipment manufacturing facility : developing robust work plan to improve resources utilization and shorten production cycle time/
… the need in semiconductor equipment has brought Varian, a giant in semiconductor manufacturer an increasing demand period. Unsatisfactory on-time delivery in the subassembly production in SMKT, however, has gradually become a critical issue that prevents the production from operating smoothly and …
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Clinical Impact of Couch to p and Rails On Imrt and Arc Therapy
… To evaluate the clinical impact of the Varian Exact Couch on dose and volume coverage to targets and critical structures and tumor control probability (TCP) for 6-MV IMRT and Arc Therapy.</p> <p><strong>Methods:</strong> Five clinical prostate patients were planned with both, 6-MV …
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Material shortage reduction at a semiconductor equipment manufacturing facility through the re-evaluation of inventory management strategies
… section of the production floor at the Varian Semiconductor Equipment business unit of Applied Materials. Through efforts in shortage data collection and subsequent analysis, it was ascertained that the inventory management strategies currently adopted by Varian are the dominant causes …
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Absolute Dose Verification in Intensity Modulated Radiation Fields
… All measurements were obtained using a Varian Clinac 21000 Varian Medical Systems Inc., Palo Alto, CA. The dosimetric property of Kodak XV film was verified for 6 and 18 MV photon beams. A technique to quantify film over response to low photon energy was presented. Monte Carlo …
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Improving operational efficiency of a semiconductor equipment manufacturing warehouse through strategic allocation of parts
… manufacturing warehouse of Applied Material's Varian Semiconductor Business Unit. At Varian, the target part delivery time from the warehouse to the production floor is 24 hours. However, during busy periods, parts are not delivered on time. Late part delivery from the warehouse to the …
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A template modeling for an assembly control : jig design
… for one of the several mechanical concerns that Varian Semiconductor Equipment is facing to achieve its goal. Managers and engineers are trying to lead Varian Semiconductor Equipment to a flow line shipment program, the intent being to eliminate the clean room area and ship all of the components …
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