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1
Bose, Prosenjit. "Geometric and computational aspects of manufacturing processes." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28686.
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Two of the fundamental questions that arise in the manufacturing industry concerning every type of manufacturing process are: (1) Given an object, can it be built using a particular process? (2) Given that an object can be built using a particular process, what is the best way to construct the object? The latter question gives rise to many different problems depending on how best is qualified. We address these problems for two complimentary categories of manufacturing processes: rapid prototyping systems and casting processes. The method we use to address these problems is to first define a geometric model of the process in question and then answer the question on that model.<br>In the category of rapid prototyping systems, we concentrate on stereolithography, which is emerging as one of the most popular rapid prototyping systems. We model stereolithography geometrically and then study the class of objects that admit a construction in this model. For the objects that admit a construction, we find the orientations that allow a construction of the object.<br>In the category of casting processes, we concentrate on gravity casting and injection molding. We first model the process and its components geometrically. We then characterize and recognize the objects that can be formed using a re-usable two-part cast. Given that a cast of an object can be formed, we determine a suitable location for the pin gate, the point from which liquid is poured or injected into a mold. Finally, we compute an orientation of a mold that ensures a complete fill and minimizes the number of venting holes for molds used in gravity casting processes.
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Wang, Wendai. "Fitting the Weibull and lognormal log-linear models to accelerated life test data." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284924.
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Accelerated life tests, in which more than one stress is often involved, have become widely used in today's industries to obtain the time-to-failure and reliability information at normal use conditions. Tests are conducted at higher than normal levels of stresses to shorten the test duration. A physical-statistical model is needed to extrapolate the results from test conditions to usage conditions. The generalized Weibull and lognormal log-linear models, as two general ALT families, cover almost all ALT models which are current in use in reliability engineering for this purpose. However, the development of multiple-stress ALTs has been hindered by the difficulty of performing adequate and satisfactory model fitting. This study presents an extensive research on both point and interval estimates of model parameters. The maximum likelihood estimates (MLE), as the first choice of the point estimate, have preferable statistical properties and well-developed theories. Due to complication of the models and data patterns, a robust and efficient algorithm is essential to successful implementation of the ML estimation. Unfortunately, the current methods get impractical, and no effective and practical approach has been developed yet for the generalized Weibull and lognormal log-linear models. A new approach to obtain ML point estimators of the parameters for both models, which takes advantage of generalized linear model (GLM), has been proposed and extensively studied in this research. The algorithm is generally numerically stable and easily programmed. The superiority is that it does not depend much on the starting values. This proposed method might generate a long-standing method to obtain the MLE for the ALT and other models which have two sets of unknown parameters, one in the mean function and other in the variance function. The likelihood ration confidence intervals have been concluded generally to be the best among the available approximate confidence methods, based on recent researches. The LR confidence bound method is successfully applied to calculate the confidence limits on the reliability under the use conditions in this study. Furthermore, the study has established a general method to calculate the LR ratio confidence limits on a function of unknown parameters. The procedures of point and interval estimates have been developed and their virtues have been demonstrated with several numerical examples of actual accelerated life test data.
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Arnold, Chad. "Combating Integrity Attacks in Industrial Control Systems." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1406586509.
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Warren, Joel Christian. "Structural Design Solver Development for Overhead Industrial Cranes: Equations-Of-State Solver Method." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1328021324.
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Esmaeilpour, Mohammad Rasoul. "Finite Element Simulation of Single Point Incremental Sheet Forming with Barlat 2004Yield Function, CPFEM, and 3D RVE." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543170842564928.
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Arceneaux, Donald J. "A 3D Printed Polycaprolactone Honeycomb Structure." Thesis, University of Louisiana at Lafayette, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10640968.
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<p> The application of sophisticated geometric structures within future host materials for increasing energy absorption and compression strength, while being fabricated from crack-healing materials, is of high interest for many functions. Raw feedstock extrusion and three-dimensional printing (3DP) technology were used to develop precise honeycomb structures through intricate deposition of polycaprolactone (PCL) filament. For standardization purposes during 3D model slicing and print quality consistency, constant wall thickness was used for honeycomb structure fabrication, manipulating only the cellular width to obtain variation of cell size to wall thickness ratios. </p><p> The honeycomb structures’ compression behaviors were studied through use of in-plane quasi-static uniaxial compression testing. Multiple cycles of compression loading were applied to the specimens in both transverse and ribbon directions at temperatures of 5 °C, room temperature (i.e. 22 °C), and 40 °C at a speed of 1.27 mm/min (0.05 in/min) per ASTM D6641. The energy absorption efficiencies of the honeycomb structure were calculated based on the compression strengths and behaviors displayed, which were then used to obtain the stepping upward stress theoretically. Using the specified stepping upward stresses, the energy absorption capabilities were found in both the transverse and ribbon directions at different temperatures per unit volume. The ability for “shape recovery” of the structures after each loading cycle was also calculated. </p><p> Outcomes from this research displayed exceptional recovery of PCL honeycomb structures after repeated compression loading cycles. Samples with relative density of 0.20 absorbed energies of up to 0.99 J/cm<sup>3</sup>. Upon removing compression loads, samples were capable of shape recovery up to 80% after the first deformation and up to 72% after the fifth deformation. When PCL honeycomb structures are used to reinforce host materials, they increase energy absorption capabilities while being capable of crack-healing functions with remarkable compressive strength. These properties make PCL advantageous for many industries.</p><p>
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Dubey, Shri Nath. "STUDY OF HOT TEARING EVALUATION METHODS AND QUANTIFICATION OF CONTRACTION FORCES IN DIE CASTING ALLOYS." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1420733310.
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Shen, Xijin 1966. "Environment support for business modelling : concepts, architecture and implementation." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26456.
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The goal of business modelling is the design, analysis, and simulation of an enterprise's architectural structures and their information technology components. To comprehensively support business modelling, an appropriate modelling environment with adequate visualization mechanisms is required. Such an environment may handle model information in a flexible, yet expressive way and support substitution, documentation, validation and dynamic analysis of models as well as model visualization and alternative representations.<br>We have developed a business modelling approach which is based on the formalism of extended, colored Petri nets. To support and validate our approach, we have engineered the Macrotec environment. Macrotec meets a list of requirements we have identified as crucial for the quality of a comprehensive modelling environment. It is conceived as a set of various tools which are seamlessly integrated. Our experience with Macrotec suggests that our concepts and environment substantially facilitate business modelling.
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Wu, Michael A. M. Eng Massachusetts Institute of Technology. "A common platform for current sensor evaluation in industrial automation applications." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106391.
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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2016.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 57-58).<br>This thesis describes the design and implementation of an evaluation system for Silicon Labs' current sensor products. The system provides significant advantages over existing evaluation systems by reducing hazardous voltages and currents through increased sense resistance and improving simplicity through a modular motherboard, daughtercard, and software system. The system is versatile and supports modifications for additional customization. All existing Silicon Labs' current sensor products are implemented in the system. The performance of the constructed evaluation system is shown to exceed existing work. The constructed system uses lower currents, requires fewer specialized components, improves portability, and provides access to advanced product functionality.<br>by Michael A. Wu.<br>M. Eng.
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Zhou, Pixuan. "Mechatronic design of flexible manipulators." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/288966.
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The construction of lightweight manipulators with a larger speed range is one of the major goals in the design of well-behaving industrial robotic arms. Their use will lead to higher productivity and less energy consumption than is common with heavier, rigid arms. However, due to the flexibility involved with link deformation and the complexity of distributed parameter systems, modeling and control of flexible manipulators still remain a major challenge to robotic research. A compromise between modeling costs and control efficiency for real-time implementation is inevitable. The interdependency of subsystems results in a local optimal performance in the traditional design scheme. An important research topic in flexible manipulator design is the pursuit of better system performance while avoiding model-intensive or control-intensive work. This problem can be solved using the proposed mechatronic design approach. It treats the mechanical, electrical and control components of a flexible manipulator concurrently. The result is an improved design with an explicit link shape and controller parameters which result in the control problem and modeling accuracy no longer being critical for obtaining desired performance. Dynamics of flexible manipulators with rotatory inertia are derived, and state-space equations with the integration of DC motor dynamics are developed as a theoretical base for mechatronic designs. Two case studies based on LQR formula and Hinfinity control are considered. The beam shape and controller parameters are obtained using an adaptive iterative algorithm with the accommodation of various geometrical constraints. Also, different output feedback strategies are investigated to evaluate the impacts of various controller structures. Finally, a sensitivity analysis in terms of parameter variations and model uncertainties is conducted to reveal the robustness of this mechatronic design.
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Sinow, Victor Samuel. "Integrated circuit control of resonant and hard switched dc/dc converters for industrial and educational applications." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/52768.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 127-128).<br>This thesis presents an integrated secondary side synchronous rectification controller, designed on a modern industrial silicon IC process, for use in the LLC resonant converter topology. The controller is intended to function in systems with output power levels up to 500 W and switching frequencies up to 1 MHz. Simulation data for this controller indicates high degrees of performance over a input voltage range of 12-48 V and an operating temperature range of -50° C to 150° C. Significant improvement over existing synchronous rectication controllers is observed. In addition, a simulation and written exercise framework, intended to couple with circuits in a pre-existing discrete hardware kit, has been developed for a proposed class on power IC design. SPICE schematics of important circuit modules as well as relevant coursework is presented and explained. The course itself is motivated by the challenges of the industrial design process, and goals include teaching students about practical power IC design techniques and developing their intuition for high level circuit function. The end result is student construction of a working controller for a traditional hard-switched dc/dc converter.<br>by Victor Samuel Sinow.<br>M.Eng.
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Shen, Yan 1954. "ADVICE: AN EXPERT SYSTEM TO HELP EVALUATE GRADUATE STUDY PLANS OF SYSTEMS & INDUSTRIAL ENGINEERING STUDENTS." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/291320.
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Shah, Hemal Vinodchandra 1967. "Performance evaluation of manufacturing systems using stochastic activity networks." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/278068.
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In this thesis, Stochastic Activity Networks (SANs), which are an extension to the Petri Nets, are used for performance evaluation of manufacturing systems. Using our formalism, a manufacturing system is hierarchically represented in three different layers: the manufacturing flow layer, the control layer and the network layer. SAN models are constructed for each of these layers. To simplify the understanding of the manufacturing flow, a new graphical representation, the Manufacturing Flow Network (MFN) has been developed. Conversion of MFN into SAN models simplifies the modeling of manufacturing flow layer. When MFN at the product level is very complex, a decomposition technique is applied to reduce complexity of the model under specific conditions. The accuracy of this technique is shown for specific conditions. Finally, a performance evaluation of a sample manufacturing system is shown, using the simulation for solution of the model. Performance variables of interest such as machine utilization, machine availability and operation queue length are discussed.
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Yang, Christopher Chuan-Chi 1968. "Active vision inspection: Planning, error analysis, and tolerance design." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282424.
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Inspection is a process used to determine whether a component deviates from a given set of specifications. In industry, we usually use a coordinate measuring machine (CMM) to inspect CAD-based models, but inspection using vision sensors has recently drawn more attention because of advances that have been made in computer and imaging technologies. In this dissertation, we introduce active vision inspection for CAD-based three-dimensional models. We divide the dissertation into three major components: (i) planning, (ii) error analysis, and (iii) tolerance design. In inspection planning, the inputs are boundary representation (object centered representation) and an aspect graph (viewer centered representation) of the inspected component; the output is a sensor arrangement for dimensioning a set of topologic entities. In planning, we first use geometric reasoning and object oriented representation to determine a set of topologic entities (measurable entities) to be dimensioned based on the manufactured features on the component (such as slot, pocket, hole etc.) and their spatial relationships. Using the aspect graph, we obtain a set of possible sensor settings and determine an optimized set of sensor settings (sensor arrangement) for dimensioning the measurable entities. Since quantization errors and displacement errors are inherent in an active vision system, we analyze and model the density functions of these errors based on their characteristics and use them to determine the accuracy of inspection for a given sensor setting. In addition, we utilize hierarchical interval constraint networks for tolerance design. We redefine network satisfaction and constraint consistency for the application in tolerance design and develop new forward and backward propagation techniques for tolerance analysis and tolerance synthesis, respectively.
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Jamieson, Andrew George. "A novel systems design approach to wireless sensor networks for industrial applications." Thesis, University of Glasgow, 2008. http://theses.gla.ac.uk/424/.
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Wireless Sensor Networks are a constantly evolving field spanning the Electronic Engineering and Computer Science domains; where the primary tasks of computation, communication and sensing are combined into ever smaller physical node devices. By utilising advanced multi-hop mesh networking techniques, scores of these nodes can form complex heterogeneous networks, where the efforts of discrete nodes combine to achieve a common goal. This themed Engineering Doctorate portfolio describes a four year period where the Research Engineer, in conjunction with the sponsoring company, The Kelvin Institute Ltd, undertook a range of interlinked research, development and business projects. Each venture was closely aligned to the technical and commercial interests of the sponsor, initiated in late 2003 by a preliminary look at the state-of-the-art and evaluation of early development nodes for location services. The primary project stemmed from this initial research and was undertaken with a collaborating company in the UK rail industry. Results from this work inspired a further project considering the use of security features to provide a new routing methodology for Wireless Sensor Networks and other ad-hoc topologies. In addition to the technical merit and academic contributions to the field, this themed portfolio considers the equally important commercial and business aspects, highlighting notable events and achievements throughout the course of the Engineering Doctorate programme.
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Kwon, Yongwon. "The significance of technology policy for a late-industrializing country to sustain its industrial development : case study of Korea's elecgronics industry." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/39071.
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Sarrazin, Pierre 1971. "Reengineering a process model generalisation tool." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27402.
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A large organization that has many projects to manage may want to build a model that gives an overview of the common and variable parts of its projects' processes. This action is process model generalisation. The McGill Software Engineering Laboratory has developed a technique and a tool to achieve that. The work described in this thesis consisted of reengineering the tool to give it a longer life expectancy and to make it part of a future client-server architecture suitable for developing a suite of process management tools. The tool was effectively reengineered and this helped the laboratory define the architecture better. Also, some lessons about software maintenance were learned.
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Emelogu, Adindu Ahurueze. "Optimal supply chain configuration for the additive manufacturing of biomedical implants." Thesis, Mississippi State University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10244178.
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<p> In this dissertation, we study two important problems related to additive manufacturing (AM). In the first part, we investigate the economic feasibility of using AM to fabricate biomedical implants at the sites of hospitals AM versus traditional manufacturing (TM). We propose a cost model to quantify the supply-chain level costs associated with the production of biomedical implants using AM technology, and formulate the problem as a two-stage stochastic programming model, which determines the number of AM facilities to be established and volume of product flow between manufacturing facilities and hospitals at a minimum cost. We use the sample average approximation (SAA) approach to obtain solutions to the problem for a real-world case study of hospitals in the state of Mississippi. We find that the ratio between the unit production costs of AM and TM (ATR), demand and product lead time are key cost parameters that determine the economic feasibility of AM.</p><p> In the second part, we investigate the AM facility deployment approaches which affect both the supply chain network cost and the extent of benefits derived from AM. We formulate the supply chain network cost as a continuous approximation model and use optimization algorithms to determine how centralized or distributed the AM facilities should be and how much raw materials these facilities should order so that the total network cost is minimized. We apply the cost model to a real-world case study of hospitals in 12 states of southeastern USA. We find that the demand for biomedical implants in the region, fixed investment cost of AM machines, personnel cost of operating the machines and transportation cost are the major factors that determine the optimal AM facility deployment configuration.</p><p> In the last part, we propose an enhanced sample average approximation (eSAA) technique that improves the basic SAA method. The eSAA technique uses clustering and statistical techniques to overcome the sample size issue inherent in basic SAA. Our results from extensive numerical experiments indicate that the eSAA can perform up to 699% faster than the basic SAA, thereby making it a competitive solution approach of choice in large scale stochastic optimization problems.</p>
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Bajaj, Akhilesh. "Managing business workflows using a database approach: A formal model, a case study and a prototype." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282443.
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Workflows are an integral part of an organization, and managing them has long been recognized as important. With recent advances in information systems, there has been a great deal of commercial and research interest in developing workflow management systems (WFMS) to help businesses manage their workflows. In the database literature, much of this work has concentrated on developing advanced transaction models that can essentially handle long-lived transactions. Many WFMS tools have been developed in industry, each usually supporting different abstractions. The current process of constructing a WFMS application consists of obtaining user requirements informally, and writing the WFMS code using a WFMS tool. Since WFMS tools are evolving, and an accepted set of abstractions that should be supported by a WFMS tool does not exist, this process is unstructured and sensitive to the WFMS tool used. This dissertation aims at providing structure to the process of developing a workflow application. Borrowing from the established process of developing a database application, we follow a "top-down" approach: use a formally defined conceptual model to capture user requirements, and then map the conceptual model to the implementation model. We first developed and formally defined a conceptual workflow model (SEAM). Since the completeness of a conceptual model in a new domain (such as workflow requirements) is important, we have also developed and tested a methodology to test the completeness of conceptual workflow models. The next step is to show how SEAM can be mapped to an implementation model. We have selected the current abstractions of computationally complete data manipulation languages, triggers, stored procedures and support for embedded data manipulation languages as the target implementation model. SEAM is mapped to this model, and a prototype is implemented as an example. Thus, this dissertation provides sufficient information to construct an automated WFMS, built on currently available abstractions. In addition, the dissertation also provides a methodology that can be used to empirically measure the completeness of conceptual workflow models.
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Schinner, Charles Edward 1957. "Electronic manufacturing test cell automation and configuration using AI techniques." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/278327.
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This thesis utilizes artificial intelligence techniques and problem specific knowledge to assist in the design of an manufacturing test cell for electronic products. The electronic printed circuit board (PCB) is subjected to one or more functional evaluation(s) during the manufacturing process. The purpose of these evaluations is to assure product quality. This thesis is focused on, with historical knowledge, the configuration of this testing environment and associated fault isolation processes. By using such knowledge, an improvement in the testing efficiency will be realized which will allow the overall product cost to be minimized.
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Strahin, Brandon L. "The Effect of Engineered Surfaces on the Mechanical Properties of Tool Steels Used for Industrial Cutting Tools." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1506692623324192.
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Perry, John Christian 1971. "Web-enabling an industrial manufacturer's supply chain." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/84233.
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Thesis (S.M.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. Electrical Engineering and Computer Science; in conjunction with the Leaders for Manufacturing Program at MIT, 2001.<br>Includes bibliographical references (p. 52).<br>by John Christian Perry.<br>S.M.
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Lembcke, Antje. "Optimized market introduction of large capital products (LCP) with long development and learning cycles." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4624.
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Any product sold is expected to be reliable and available when the customer wants to operate it. Companies that produce large capital products (LCP), such as rockets, satellites, or large gas turbines to generate electrical energy, tend to shy away from extending their testing and validation method above the requirements by law, mainly due to the very high costs of each additional test and the uncertain return on investment. This research shows that today's state of the art validation methods for LCP, required by law, or suggested in literature, and adapted by these industries, are not capable of capturing all significant failure modes (or even enough failure modes), with the consequence that the subsequently sold commercial products will still experience failures with significant effects on product reliability, and subsequently on the companies' bottom line earnings projections. The research determines the type of data (significant variables) necessary to correlate a company's validation policy to product failures after commercialization, and predicts the financial impact of the current validation policy on the company's profitability. An optimized validation plan and testing policy is suggested, and its impact on a company's profitability is demonstrated through simulation. A generic methodology is derived and its viability is illustrated using a specific product and a dynamic model developed with data available to the researcher. The generic method can be applied by any company to develop its own model for optimizing product reliability prior to market introduction.<br>ID: 029049914; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (Ph.D.)--University of Central Florida, 2010.; Includes bibliographical references (p. 143-145).<br>Ph.D.<br>Doctorate<br>Department of Industrial Engineering and Management Systems<br>Engineering and Computer Science
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Carlshamre, Pär. "A usability perspective on requirements engineering : from methodology to product development." Doctoral thesis, Linköpings universitet, MDALAB - Human Computer Interfaces, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4976.
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Usability is one of the most important aspects of software. A multitude of methods and techniques intended to support the development of usable systems has been provided, but the impact on industrial software development has been limited. One of the reasons for this limited success is the gap between traditional academic theory generation and commercial practice. Another reason is the gap between usability engineering and established requirements engineering practice. This thesis is based on empirical research and puts a usability focus on three important aspects of requirements engineering: elicitation, specification and release planning. There are two main themes of investigation. The first is concerned with the development and introduction of a usability-oriented method for elicitation and specification of requirements, with an explicit focus on utilizing the skills of technical communicators. This longitudinal, qualitative study, performed in an industrial setting in the first half of the nineties, provides ample evidence in favor of a closer collaboration between technical communicators and system developers. It also provides support for the benefits of a task-oriented approach to requirements elicitation. The results are also reflected upon in a retrospective paper, and the experiences point in the direction of an increased focus on the specification part, in order to bridge the gap between usability engineering and established requirements management practice. The second represents a usability-oriented approach to understanding and supporting release planning in software product development. Release planning is an increasingly important part of requirements engineering, and it is complicated by intricate dependencies between requirements. A survey performed at five different companies gave an understanding of the nature and frequency of these interdependencies. This knowledge was then turned into the design and implementation of a support tool, with the purpose of provoking a deeper understanding of the release planning task. This was done through a series of cooperative evaluation sessions with release planning experts. The results indicate that, although the tool was considered useful by the experts, the initial understanding of the task was overly simplistic. As a result, a number of design implications are proposed.<br>On the day of the public defence the status of article VI was: Submitted.
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Kanumury, Rajesh. "Integrating business and engineering processes in manufacturing environment using AI concepts." Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1179423333.
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Pietromonaco, Joseph Allen. "A Heat Transfer Model for Industrial Food Processes." Youngstown State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1312936641.
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Clark, Paul (Paul Douglas) 1967. "Japan mobile services : evaluating a new-economy opportunity for a U.S. industrial." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/84516.
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Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; in conjunction with the Leaders for Manufacturing Program at MIT, 2001.<br>Includes bibliographical references (leaf 78).<br>by Paul Clark.<br>S.M.<br>M.B.A.
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Zia, Vivian. "A computerized nursing workload management system in a pediatric ICU." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0007/MQ29638.pdf.
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Kulak, Fuat. "Development of a neocognitron simulator for GT." Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1178129123.
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Shen, Xinwei. "Numerical modeling and experimental investigation of laser-assisted machining of silicon nitride ceramics." Diss., Kansas State University, 2010. http://hdl.handle.net/2097/6645.
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Doctor of Philosophy<br>Department of Industrial & Manufacturing Systems Engineering<br>Shuting Lei<br>Laser-assisted machining (LAM) is a promising non-conventional machining technique for advanced ceramics. However, the fundamental machining mechanism which governs the LAM process is not well understood so far. Hence, the main objective of this study is to explore the machining mechanism and provide guidance for future LAM operations. In this study, laser-assisted milling (LAMill) of silicon nitride ceramics is focused.
Experimental experience reveals that workpiece temperature in LAM of silicon nitride ceramics determines the surface quality of the machined workpiece. Thus, in order to know the thermal features of the workpiece in LAM, the laser-silicon nitride interaction mechanism is investigated via heating experiments. The trends of temperature affected by the key parameters (laser power, laser beam diameter, feed rate, and preheat time) are obtained through a parametric study. Experimental results show that high operating temperature leads to low cutting force, good surface finish, small edge chipping, and low residual stress. The temperature range for brittle-to-ductile transition should be avoided due to the rapid increase of fracture toughness.
In order to know the temperature distribution at the cutting zone in the workpiece, a transient three-dimensional thermal model is developed using finite element analysis (FEA) and validated through experiments. Heat generation associated with machining is considered and demonstrated to have little impact on LAM. The model indicates that laser power is one critical parameter for successful operation of LAM. Feed and cutting speed can indirectly affect the operating temperatures.
Furthermore, a machining model is established with the distinct element method (or discrete element method, DEM) to simulate the dynamic process of LAM. In the microstructural modeling of a β-type silicon nitride ceramic, clusters are used to simulate the rod-like grains of the silicon nitride ceramic and parallel bonds act as the intergranular glass phase between grains. The resulting temperature-dependent synthetic materials for LAM are calibrated through the numerical compression, bending and fracture toughness tests. The machining model is also validated through experiments in terms of cutting forces, chip size and depth of subsurface damage.
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Landry, Jacques-André. "Computer software for the control of potato storage environment." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41668.
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Much research has proven that computer controlled vegetable storage can achieve better storage conditions than traditional control systems. During the last 10 years, the use of microcomputer-based environmental control systems has become commonplace. However, to take full advantage of this computerization of the control process, it is not enough only to program the control functions that are performed by normal analog equipment. New and better control strategies must be developed. Recent advances in computer technology have made possible the development of expert systems; a branch of artificial intelligence. One of the advantages of developing such a system is that it provides a reasoning tool which approaches the level of proficiency human experts exhibit in that field. The application of new control methods using expert systems has been extensively demonstrated for greenhouse environments. However, the application of expert systems for the control of vegetable storage is still to be investigated. In the first phase of this project, the development and implementation of a sophisticated control software, using a conventional algorithm-based programming language, were achieved. Throughout the three years of experimentation in an industrial potato storage, the software proved to be appropriate for the control of storage environmental parameters (temperature and relative humidity). During the second phase, the application of an expert system for the on-line control of potato storage was explored. The development of a rule-based expert system, that could replace the conventional algorithm-based control routines was achieved. The integration of the expert system into the control software will result in a highly efficient control software, which can easily be maintained and improved as new knowledge emerges. The use of an expert system will also render possible the representation of heuristic knowledge in the form of rules, which was not possible with the use of conven
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Atkins, Cynthia. "An Investigation of the Impact of Requirements Engineering Skills on Project Success." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etd/1515.
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A survey of project managers and requirements engineers was conducted to determine what skills, qualifications, and experiences were associated with project success. Survey results indicated that projects using Joint Application Development (JAD) sessions, use cases, and prototypes to engineer requirements were most successful. Other indicators of project success, according to participants, included an adequate allotment of time for requirements engineering—at least 15% of a project's time—and the use of project managers and requirements engineers with professional work experience. In particular, data indicated that Project Managers with at least five years of experience in Information Technology resulted in more successful projects.
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Danielsson, Oscar. "Augmented reality smart glasses as assembly operator support : Towards a framework for enabling industrial integration." Licentiate thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-19339.
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Operators are likely to continue to play an integral part in industrial assembly for the foreseeable future. This is in part because increasingly shorter life-cycles and increased variety of products makes automation harder to achieve. As technological advancements enables greater digitalization, the demands for increased individual designs of products increases. These changes, combined with a global competition, does put an increasing strain on operators to handle large quantities of information in a short timeframe. Augmented reality (AR) has been identified as a technology that can present assembly information to operators in an efficient manner. AR smart glasses (ARSG) is an implementation of AR suitable for operators since they are hands-free and can provide individual instructions in the correct context directly in their real work environment. There are currently early adopters of ARSG in production within industry and there are many predictions that ARSG usage will continue to grow. However, to fully integrate ARSG as a tool among others in a modern and complex factory there are several perspectives that a company need to take into consideration. This thesis investigates both the operator perspective and the manufacturing engineering perspective to support industry in how to make the correct investment decisions as regards to ARSG. The aim of this licentiate thesis is to provide a basis for a framework to enable industry to choose and integrate ARSG in production as a value adding operator support. This is achieved by investigating the theoretical basis of ARSG related technology and its maturity as well as the needs operators have in ARSG for their usage in assembly. The philosophical paradigm that is followed is that of pragmatism. The methodology used is design science, set in the research paradigm of mixed methods. Data has been collected through experiments with demonstrators, interviews, observations, and literature reviews. This thesis provides partial answers to the overall research aim. The thesis shows that the topic is feasible, relevant to industry, and a novel scientific contribution. Observations, interviews, and a literature review gave an overview of the operator perspective. Some highlights from the results are that operators are willing to work with ARSG, that operators need help in unlearning old tasks as well as learning new ones, and that optimal weight distribution of ARSG is dependent on the operators’ head-positioning. Highlights from the preliminary findings for the manufacturing engineering perspective include a general lack of standards for AR as regards vertical industrial application, improved tools for faster instruction generation, and large variations in specifications of available ARSG. Future work includes a complete answer to the manufacturing engineering perspective as well as combining all the results to create a framework for ARSG integration in industry.<br>Operatörer kommer sannolikt fortsätta att vara en integral del av industriell montering inom en överskådlig framtid. Detta beror delvis på allt kortare livscykler och ökad variation på produkter gör det svårare att automatisera produktionen. Samtidigt som tekniska framsteg möjliggör mer digitalisering så ökar efterfrågan på individuellt designade produkter. De här förändringarna, i kombination med en global konkurrens, skapar en ökad press på operatörer att hantera stora mängder information inom en kort tidsram. Förstärkt verklighet (förkortat AR från engelska ”augmented reality”) har identifierats som en teknologi som effektivt kan presentera monteringsinstruktioner för operatörer. Smarta AR glasögon (förkortat ARSG från engelska ”AR smart glasses”) är en implementering av AR som är lämplig för operatörer eftersom de inte behöver använda sina händer för att bära dem och för att de kan presentera individuella instruktioner i rätt kontext direkt i deras verkliga arbetsmiljö. Det finns industriföretag som redan har börjat använda ARSG i produktion och det finns många förutsägelser om att ARSG kommer fortsätta att växa. För att kunna fullt integrera ARSG som ett bland många verktyg i en modern och komplex fabrik så måste dock ett företag ta hänsyn till ett flertal perspektiv. Den här avhandlingen undersöker både operatörs-perspektivet och beredningsperspektivet för att stödja industrins investeringsbeslut rörande ARSG. Målet med den här licentiatavhandlingen är att bidra med en grund för ett ramverk som kan möjliggöra för industrin att välja, integrera och underhålla ARSG i produktion som ett värdeskapande operatörsstöd. Det här åstadkoms genom att undersöka den teoretiska grunden för ARSG-relaterad teknologi och dess mognad och även operatörernas behov i ARSG när de används i montering. Det filosofiska paradigm som har följts är pragmatism. Metodologin som har används är designvetenskap, kopplat till forskningsparadigmet blandade metoder. Data har samlats in genom demonstratorexperiment, intervjuer, observationer och litteraturstudier. Den här avhandlingen ger partiellt svar till det övergripande forskningsmålet. Avhandlingen visar att ämnet är möjligt att genomföra, relevant för industrin och ett originellt vetenskapligt bidrag. Observationer, intervjuer och en litteraturstudie gav en översikt av operatörsperspektivet. Några exempel från resultaten att lyfta fram är att operatörer är villiga att arbeta med ARSG, att operatörer behöver hjälp med att avlära sig gamla uppgifter såväl som att lära sig nya och att den optimala viktspridningen av ARSG beror på operatörernas huvudpositionering. Bland de preliminära resultaten från beredningsperspektivet inkluderas en generell avsaknad av standarder för AR gällande vertikala industriella tillämpningar, förbättrade verktyg för instruktionsskapande som stödjer snabbare instruktionsgenerering och stora variationer gällande specifikationer i tillgängliga ARSG. Framtida arbete inkluderar ett komplett svar till beredningsperspektivet samt att kombinera alla resultaten för att skapa ett ramverk för ARSG integration i industrin.<br><p>PUBLICATIONS WITH LOWER RELEVANCE</p><p>1. Holm, M., Danielsson, O., Syberfeldt, A., & Moore, P. (2017). Adaptive instructions to novice shop-floor operators using augmented reality. Journal of Industrial and Production Engineering, 34, 362-374.</p><p>2. Syberfeldt, A., Danielsson, O., & Gustavsson, P. (2017). Augmented Reality Smart Glasses in the Smart Factory: Product Evaluation Guidelines and Review of Available Products. IEEE Access, 5, 9118-9130.</p><p>3. Syberfeldt, A., Danielsson, O., Holm, M., & Wang, L. (2016). Dynamic operator in-structions based on augmented reality and rule-based expert systems. Proceedings of the 48thCIRP Conference on Manufacturing Systems, 41, 346-351.</p><p>4. Syberfeldt, A., Holm, M., Danielsson, O., & Wang, L. (2016). Support systems on the industrial shop-floors of the future: operators’ perspective on augmented reality. 6th CIRP Conference on Assembly Technologies and Systems, 44, 108-113.</p><p>5. Syberfeldt, A., Holm, M., Danielsson, O., & Wang, L. (2015). Visual Assembling Guidance Using Augmented Reality. Procedia Manufacturing, 1, 98-109.</p><p>6. Syberfeldt, A., Danielsson, O., Holm, M., & Ekblom, T. (2014). Augmented Reality at the Industrial Shop-Floor. Augmented and Virtual Reality, 1, 201-209.</p>
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Lochtefeld, Darrell F. "Multi-objectivization in Genetic Algorithms." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1308765665.
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Rahayem, Mohamed. "Planar segmentation for Geometric Reverse Engineering using data from a laser profile scanner mounted on an industrial robot." Licentiate thesis, Örebro University, Department of Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-2318.
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<p>Laser scanners in combination with devices for accurate orientation like Coordinate Measuring Machines (CMM) are often used in Geometric Reverse Engineering (GRE) to measure point data. The industrial robot as a device for orientation has relatively low accuracy but the advantage of being numerically controlled, fast, flexible, rather cheap and compatible with industrial environments. It is therefore of interest to investigate if it can be used in this application.</p><p>This thesis will describe a measuring system consisting of a laser profile scanner mounted on an industrial robot with a turntable. It will also give an introduction to Geometric Reverse Engineering (GRE) and describe an automatic GRE process using this measuring system. The thesis also presents a detailed accuracy analysis supported by experiments that show how 2D profile data can be used to achieve a higher accuracy than the basic accuracy of the robot. The core topic of the thesis is the investigation of a new technique for planar segmentation. The new method is implemented in the GRE system and compared with an implementation of a more traditional method.</p><p>Results from practical experiments show that the new method is much faster while equally accurate or better.</p>
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Sarkar, Arkopaul. "Semantic Agent Based Process Planning for Distributed Cloud Manufacturing." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1578585210407386.
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Van, den Honert Andrew. "Estimating the continuous risk of accidents occurring in the South African mining industry." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96072.
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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Statistics from mining accidents expose that the potential for injury or
death to employees from occupational accidents is relatively high. This study
attempts to contribute to the on-going efforts to improve occupational safety
in the mining industry by creating a model capable of predicting the continuous
risk of occupational accidents occurring. Model inputs include the time
of day, time into shift, temperatures, humidity, rainfall and production rate.
The approach includes using an Artificial Neural Network (ANN) to identify
patterns between the input attributes and to predict the continuous risk of
accidents occurring. As a predecessor to the development of the model, a
comprehensive literature study was conducted. The objectives of the study
were to understand occupational safety, explore various forecasting techniques
and identify contributing factors that influence the occurrence of accidents and
in so doing recognise any gaps in the current knowledge. Another objective
was to quantify the contributing factors identified, as well as detect the sensitivity
amongst these factors and in so doing deliver a groundwork for the
present model.
After the literature was studied, the model design and construction was
performed as well as the model training and validation. The training and
validation took the form of a case study with data from a platinum mine
near Rustenburg in South Africa. The data was split into three sections,
namely, underground, engineering and other. Then the model was trained and
validated separately for the three sections on a yearly basis. This resulted
in meaningful correlation between the predicted continuous risk and actual
accidents as well as the majority of the actual accidents only occurring while
the continuous risk was estimated to be above 80%. However, the underground section has so many accidents, that the risk is permanently very high. Yet, the
engineering and other sections produced results useful for managerial decisions.<br>AFRIKAANSE OPSOMMING: Mynbou ongeluk statistieke dui aan dat die potensiaal vir besering of dood
as gevolg van beroepsongelukke relatief hoog is. Die studie poog om by te dra
tot die voortdurende verbetering van beroepsveiligheid in die mynbedryf deur
middel van ’n model wat die risiko van beroepsongelukke voorspel. Die model
vereis die tyd, tyd verstreke in die skof, temperatuur, humiditeit, reënval en
produksie tydens die ongeluk as inset. Die benadering tot hierdie model maak
gebruik van ’n Kunsmatige Neurale Netwerk (KNN) om patrone tussen die
insette te erken en om die risiko van ’n voorval te beraam. As ’n voorloper
tot die model ontwikkeling, is ’n omvattende literatuurstudie onderneem. Die
doelwitte van die literatuur studie was om beroepsveiligheid beter te verstaan,
verskeie voorspellings tegnieke te ondersoek en kennis van bydraende faktore
wat lei tot voorvalle te ondersoek. Nog ’n doelwit sluit die kwantifisering in van
geidentifiseerde bydraende faktore, asook die opsporing van die sensitiwiteit
tussen hierdie faktore en hierdeur ’n fondasie vir die voorgestelde model te
skep.
Na afloop van die literatuurstudie is die model ontwikkel, opgelei en gevalideer.
Die opleiding en validasie is deur middel van ’n gevallestudie in ’n
platinummyn naby Rustenburg in Suid Afrika gedoen. Die data is verdeel in
drie afdelings, d.i. ondergronds, ingenieurswese en ander. Die model is vir
elke afdeling apart opgelei en gevalideer op ’n jaarlikse basis. Hierdie het gelei
tot ’n betekenisvolle korrelasie tussen die voorspelde risiko en die werklike
ongelukke met die meerderheid van die werklike ongevalle wat voorgekom het
terwyl die risiko 80% oorskry het. In die ondergrondse afdeling is so baie voorvalle waarneem dat die risiko permanent hoog is. Die ander afdelings het wel
resultate verskaf wat sinvol gebruik kan word in bestuursbesluite.
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Saberi, Iftekhar Ali. "Merge as it relates to computer integrated manufacturing environment." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou1174322707.
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Hopkins, Christopher David. "Development and Characterization of Optimum Process Parameters for Metallic Composites made by Ultrasonic Consolidation." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275414900.
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Mourad, Atallah. "Human interface and interaction in the WITS training system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0027/MQ50643.pdf.
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Swaminathan, Selvakumar. "Critical Success Factors of ERP Implementation." University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1302248857.
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Shraim, Mustafa S. "An expert system for designing statistical experiments." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182516879.
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Athreya, Prahlad S. "The CAD query language towards design-concurrent cost estimation /." Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1177523234.
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Bakshi, Girish. "Comparison of ridge regression and neural networks in modeling multicollinear data." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178815205.
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Kesaraju, Vishnu Sharma. "An Integrated Simulation Environment Combining Process-Driven and Event-Driven Models." Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1238779995.
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Markarian, Naro R. "Environmental control of vegetable storage environments." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31268.
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A large-scale experimental, state of the art storage facility was constructed on the Macdonald Campus of McGill University. This storage facility will serve as a tool to further investigate many of the laboratory experiments performed in agricultural and food science topics, by providing a representation of actual storage facilities in use in the industry today. The storage facility was fully instrumented to provide valuable data of the stored commodity and it's environment. A custom control software was developed with a user friendly graphical interface. This fully automated software allows data acquisition and control of temperature and relative humidity of the experimental storage facility.<br>Experiments were performed and the control software provided an adequate temperature and relative humidity control. The controller was based on a conventional PID or proportional, integral and derivative controller. To further improve the control of the storage facility, a novel multivariable PID controller was developed using enthalpy as the process variable, which encompasses both temperature and relative humidity. The novel controller was tested using a mathematical model developed. Simulations were performed comparing the performance of the novel multivariable controller to two other conventional controllers. The results demonstrate that the novel multivariable PID controller is capable of controlling temperature and relative humidity better than the other two conventional control techniques.
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Rangwala, Maimuna H. "Empirical investigation of decision tree extraction from neural networks." Ohio : Ohio University, 2006. http://www.ohiolink.edu/etd/view.cgi?ohiou1151608193.
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Okano, Makoto. "The design of a PC based financial credit evaluation system involving an artificial neural network for the evaluation of industrial manufacturers." Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1178138160.
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Dawson, Patrick Mark Bryant. "Computer technology and the redefinition of supervision : a study of the effects of computerisation on railway freight supervisors." Thesis, University of Southampton, 1985. https://eprints.soton.ac.uk/374877/.
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The relationship between computer technology and supervision is examined with reference to new empirical evidence drawn from a study of the computerisation of freight operations in British Rail. Attention is focused on the extent to which computerisation allows for a more integrated system of management control, and the possibility of devolving additional elements of control from middle management to the local supervisory level. Contemporary research often claims that the first-line supervisor is becoming more peripheral to the direct control of operations, as computerised equipment takes over the execution of many supervisory tasks, and as operatives who are skilled in the use of new technology overtake the apparent skill superiority of first-line supervisors. This thesis contends that it is misleading to focus on the 'pure' role of the first-line supervisor when studying the effects of computer technology on supervision. The main body of empirical data is drawn from an in-depth study of the effects of change in five traditional marshalling yards in three British Rail regions. The case study examines how the application of a comprehensive computer system to process and transmit information over diverse and spatially distant freight yards can transform the distribution of responsibilities for operational control within management. It is argued that the redistribution of management control functions over a network of organisational levels has resulted in a far more complex redefinition of supervision than is implied by the apparent erosion of the role of the first-line supervisor. A broader conception of supervision is presented in order to explain changes in the distribution of supervisory tasks across various supervisory levels, within the context of changes in work organisation and the system of management control. Finally, it is argued that whilst computerisation may erode the traditional basis of supervision, it may also result in the emergence of a new type of computer-oriented supervisor, whose role is to use the 'realtime' information provided by the computer to co-ordinate and control previously diverse areas of production or service operations.
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Kayaalp, Naime F. "Deciding Polarity of Opinions over Multi-Aspect Customer Reviews." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1408362716.
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