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Ramchander, Rajesh. "Quadrature-point stabilization of Mach-Zehnder interferometers." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41594.
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Optical fiber magnetometers are extremely sensitive devices which are capable of competing with magnetometers implemented using other technologies. Demodulation of the signals detected using these magnetometers can be performed using either homodyne or heterodyne techniques. Higher sensitivities have been achieved using homodyne rather than heterodyne techniques, but with homodyne demodulation there exists the inherent problem of quadrature-point stabilization. Presented here is a review of existing quadrature-point stabilization methods and experimental results concerning the application of one of them which uses a piezoelectric transducer in the reference arm of an all-fiber Mach-Zehnder interferometer.Master of Science
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Kumar, Nishith. "Design and construction of a novel thermal interferometer." Swinburne Research Bank, 2009. http://hdl.handle.net/1959.3/64905.
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Dawkins, Samuel T. "Sapphire room temperature optical frequency reference : design, construction and application." University of Western Australia. School of Physics, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0200.
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A pair of high-stability optical frequency references has been developed. The devices are based on room temperature Fabry-Perot cavities with mirrors spaced apart by a hollow single-crystal sapphire element. The sapphire element delivers mechanical sti ness that provides improved immunity to vibrational perturbations compared with the more common spacers made from ultra-low expansion glass. The system is housed in an vacuum chamber designed to provide isolation from environmental perturbations through the use of an active thermal control system, suspension legs and a unique beam alignment system. The dimensional stability of the Fabry-Perot was translated into a highly stable laser frequency by frequency locking a 1064nm Nd:YAG laser to the centre of a mode of the cavity. This frequency lock was implemented by the Pound-Drever-Hall scheme. By careful design, this control system was able to hold the frequency of the laser to within parts in 1016 of the frequency of the fundamental cavity mode. The minimum fractional frequency stability of the laser frequency was measured at 2.1x10[-]14 for integration times of 0.8 s, limited by the residual instability of the Fabry-Perot cavity. The experimental methods used to measure the performance of the system have also been considered in depth. For example, the most common way of characterizing the frequency stability of a frequency standard is the Allan variance. It is demonstrated that, without care, data taken with modern frequency counters can produce erroneous and distorted results when their output is supplied to this algorithm. The method to avoid or account for these errors is also presented. The Fabry-Perot cavity performance is limited on long timescales by residual temperature uctuations, which can be ameliorated in future by enhancing the design of the thermal control system. At short timescales, the system is limited by vibration-induced uctuations together with a white noise source, that is yet to be identi ed, but may relate to fundamental thermodynamic temperature uctuations of the sapphire spacer. This system was used to measure the stability of an optical signal synthesised from a cryogenic microwave sapphire oscillator using an wide-band optical frequency comb. This was the rst demonstration of a multiplication of an ultra-stable signal from the microwave frequency domain into the optical frequency domain, without loss of delity at the level of 2x10[-]14.
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Ghalandar, Zehi Jalalabad Toomaj. "Design Quality in Architecture and Construction Research." Thesis, KTH, Fastigheter och byggande, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254838.
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The issue of design quality in construction projects has long been a major concern for designprofessionals (Gann et al. 2003). The emphasis on improvement of processes in constructionin order to manage or reduce “cost, time and waste” in projects, at times has led to concernsthat the design of a building could become a matter of less importance due to such processimproving measures (Gann et al. 2003, p.319) “Design Quality” in architecture andconstruction is an ambiguous and “dynamic concept” in relation to its context, continuouslygoing through changes (Rönn 2010, p.48; Slaughter 2004).Quality itself is related to value and multiple definitions of it (Rönn 2010). It is often possiblefor both people and professionals to feel and experience design quality in buildings ratherintuitively, but to frame it in a recognizable manner has always proved challenging (Rönn2010). Essentially, human behavior apart from being influenced by the physical environmentis also influenced by the social context existing within the physical environment (Vischer2008).These challenges further extend to judgement, assessment and measurement of design quality,and setting out the relevant criteria for them (Rönn 2010, Slaughter 2004). Therefore, it’sdifficult for building designers, to structure design solutions that could guarantee theachievement of such ambiguous concept (Rönn 2010).Frågan om designkvalitet i byggprojekt har länge varit ett stort bekymmer för designers (Gannet al. 2003). Betoningen på förbättring av processer inom konstruktion för att hantera ellerminska ”kostnad, tid och slöseri” i projekt har ibland lett till en oro för att utformning ochdesign av en byggnad kan bli av mindre betydelse på grund av sådana processförbättrandeåtgärder (Gann et al. 2003, p.319) ”Designkvalité” i arkitektur och konstruktion är ett tvetydigtoch ”dynamiskt koncept” i förhållande till sitt sammanhang, som ständigt genomgårförändringar (Rönn 2010, s.48; Slaughter 2004).Kvalité i sig är relaterad till värde och flera definitioner av det (Rönn 2010). Det är ofta möjligtför både människor och yrkesverksamma att känna och uppleva designkvalité i byggnaderganska intuitivt, men att rama in den på ett igenkännbart sätt har visat sig utmanande (Rönn2010). I huvudsak påverkas det mänskliga beteendet utöver den fysiska miljön även av densociala kontexten som finns inom den fysiska miljön (Vischer 2008).Dessa utmaningar sträcker sig vidare till bedömning, värdering och mätning av designkvalitéeroch fastställande av relevanta kriterier för dem (Rönn 2010, Slaughter 2004). Därför är detsvårt för byggnadsdesigners att konstruera designlösningar som garanterat kan uppnå ett sådanttvetydigt koncept (Rönn 2010).
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Au, Siu-man Michael. "Construction IT Centre." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25945932.
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Brown, Robert Stephen. "Sustainable design and construction strategies for research building typologies." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000850.
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Ellwood, Jeffrey L. "Design and construction of a composite airframe for UAV research." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA232422.
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Thesis (M.S. in Aeronautical Engineering)--Naval Postgraduate School, June 1990.Thesis Advisor(s): Howard, Richard M. Second Reader: Lindsey, Gerald H. "June 1990." Description based on signature page as viewed on October 21, 2009. DTIC Identifier(s): Composite materials, ducted fan, airframes, vertical takeoff aircraft, remotely piloted vehicles. Author(s) subject terms: UAV, composites, AROD, TDF, RPV, ducted fan, vertical takeoff. Includes bibliographical references (p. 74-75). Also available online.
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Meunier, Véronique Marcelle. "Development of a mesoscale radiometer for weather research." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116071.
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A new microwave radiometer, the Mesoradiometer, was constructed and the meteorological information contained in its data were examined. This instrument is designed to measure the distribution of water vapor and liquid water in the atmosphere.The Mesoradiometer uses 32 channels located on both sides of the 22.235 GHz water vapor absorption peak, as well as a narrow beam width antenna, and a pedestal giving the instrument the capacity to scan the atmosphere in order to detect water vapor. During the characterization of the instrument, a problem in maintaining the stability of the instrument's temperature was detected.
Even with this problem, the Mesoradiometer successfully measured atmospheric water vapor and liquid water. The instrument was capable of tracking the movements of clouds. This is possible thanks to its rapid scanning strategy, such tracking being impossible with traditional radiometers.
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Duraski, Robert F. (Robert Franklin). "Design and construction of the versatile toroidal facility for ionospheric chamber research." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/97783.
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Machaalani, Roland Department of Industrial Design UNSW. "The research and design of a two-seater lounge." Awarded by:University of New South Wales. Department of Industrial Design, 2001. http://handle.unsw.edu.au/1959.4/19328.
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To document the design, prototype and manufacture of a lounge, which stimulates communication and human interaction. The lounge will also question conventional seating arrangements, and redefine how two people can sit in relation to each other, converse, interact and exchange body language. The process began with an initial design sketch, and producing a prototype. This step was required, as it was the starting point for the major project. It provided me with an initial design to criticize and improve on. The major project is intended to test the validity of the initial design, analyse the markets, and improve the design in relation to ergonomic issues, material/manufacturing resolution and produce a marketing plan. The next stage of the process was the gathering and analysis of relevant information in order to redefine the design brief. This involved preliminary research into marketing, ergonomics, materials and manufacturing processes. With the design brief now established, concepts were prepared and compared against the products criteria. The design solution which best met the criteria was further detailed and developed. Finally, a business plan was put together to test the commercial viability of the lounge. The business plan was comprised of the viable markets, production cost, investment cost, discounted cash flow, and sensitivity analysis.
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Dowling, Susan J. "Constructing Identity Identity Construction." Digital Archive @ GSU, 2011. http://digitalarchive.gsu.edu/art_design_theses/88.
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In this art-based study I will examine the construction of identity creating three life size figures utilizing metaphor and symbolism. I recorded and analyzed the process through reflections. The artist/teacher/researcher will provide conclusions based on art production and self-reflection.
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Jeffrey, James Howard. "Recurrent problems in the construction process : an action research study of the design and construction quality of hospital en-suites." Thesis, University of Salford, 2010. http://usir.salford.ac.uk/26736/.
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Research was undertaken based upon the suspicion that there were recurrent problems with the design and construction of hospital en-suites. An investigation was planned to confirm whether or not this suspicion was true and that there were, in fact, recurrent problems. Following on from this it would be to find out if they existed, what they were and whether and how they could be overcome. These objectives needed to be formulated, and then positioned within a framework that identified if the practitioners within the industry even knew about the problems and if they did, whether they chose not to resolve them or could not overcome the barriers that prevented the resolution. A review of the Literature identified that little research had been undertaken in the area of problems with the design and construction of hospital en-suites. The broader perspective of problems within the construction industry was covered by the theories supporting construction Process Improvement. This area was reviewed and it was found that the results of practical implementation of Process Improvement were rather less successful than had originally been anticipated. The Sub-processes that combined together to make up the whole processes were considered and reviewed also. Theories relating to the improvement of the Sub-process of Design; Management, Quality and Briefing were reviewed. These reviews of the Process and Design Sub-processes identified that there were significant barriers within organisation that made improvements difficult to implement. The opportunity arose to review the suggested existence of problems with the design and construction of hospital en-suites by way of case Study research at the £330million Derby PFI hospital redevelopment. At this project approximately 400 en-suites were going to be constructed. Action Research was proposed to implement practical interventions aimed at identifying the problems and their solutions. During the course of the research a second project, the similarly sized £330 million PFI redevelopment of the Mansfield hospital project, also with approximately 400 en-suites. This provided the basis for a second Case Study. The original research approach of Action Research within a Case Study was modified to two Case Studies each embracing Action Research contained within an overarching Action Research strategy. Planned interventions in the construction processes were undertaken to identify whether knowledge could become embedded in that construction process that would eliminate any problems identified in the design and construction of hospital en-suites. The techniques for information gathering included workshops, constructing Mock-ups, Simulation exercises, Structured interview based on carefully prepared Questionnaires to form agenda's and Site Visits. From the research emerged the 'Notion of Solute' as a theoretical model for problem resolution which overcomes the difficulty of Knowledge Transfer. From the investigations within the two Case Studies into hospital en-suites a solution to the problems required the transfer of the knowledge of three components: The nature of the problems, The implications of not remedying the problems. Recommendations for resolving the problems. These three components, which formulate the solutions, were suggested to be defined as a 'Solute'. This is a distinct and focussed 'package of knowledge' that can be readily transferred, both between individuals and also between projects. This 'Solute' is a theoreticz model that could be transferred to other problems within hospitals, other problems within construction projects and even to problems in other industries. Each 'Solute' is then populated with the specific parameters required to enable a problem to be understood and a solution to be implemented. Keywords: Knowledge, Design, Quality, Hospital, En-suite.
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Manuel, Jack Elliot. "Design, Construction, and Application of an Electrostatic Quadrupole Doublet for Heavy Ion Nuclear Microprobe Research." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062819/.
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A nuclear microprobe, typically consisting of 2 - 4 quadrupole magnetic lenses and apertures serving as objective and a collimating divergence slits, focuses MeV ions to approximately 1 x 1 μm for modification and analysis of materials. Although far less utilized, electrostatic quadrupole fields similarly afford strong focusing of ions and have the added benefit of doing so independent of ion mass. Instead, electrostatic quadrupole focusing exhibits energy dependence on focusing ions. A heavy ion microprobe could extend the spatial resolution of conventional microprobe techniques to masses untenable by quadrupole magnetic fields. An electrostatic quadrupole doublet focusing system has been designed and constructed using several non-conventional methods and materials for a wide range of microprobe applications. The system was modeled using the software package "Propagate Rays and Aberrations by Matrices" which quantifies system specific parameters such as demagnification and intrinsic aberrations. Direct experimental verification was obtained for several of the parameters associated with the system. Details of the project and with specific applications of the system are presented.
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Chiu, Chi-tat, and 趙志達. "Design and development of a programmable micro-ultrasound research platform with parallel computing capacity." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B46290977.
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Au, Siu-man Michael, and 區兆文. "Construction IT Centre." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31984988.
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Ng'anjo, Peter. "Research into the properties of lateritic gravels and their impact on pavement design." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51897.
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Thesis (M.Ing.)--Stellenbosch University, 2000.ENGLISH ABSTRACT: Laterites are used extensively in the tropics as road building materials in unbound base, sub-base layers and in surface layers. However, most base course specifications usually require the provision of crushed and graded stone or stabilized base and often exclude the general use of as-dug laterites or other naturally occurring gravels. Various field studies in the past have clearly indicated that many lateritic gravel deposits can be used successfully as base course materials in roads carrying low to medium traffic without incurring additional maintenance costs and with considerable cost savings in pavement construction rehabilitation. Further research is needed for the more precise definition of the relationship between laterite characteristics, traffic loading, environment, and pavement performance. In this study, extensive use was made of static and cyclic triaxial testing to investigate the fundamental behaviour of a lateritic gravel material. The tests produce information for characterizing the shear strength, stress-strain properties and behaviour under repeated loading. The gravel was sourced from stockpile at Malans Transport borrow pit at Maaitjies Kuil near Cape Town. Testing was conducted on the material both as granular material and stabilized with cement and foamed bitumen. Testing was done under various conditions of stress, moisture and compaction. The resilient modulus of the lateritic gravel was found to be affected by moisture and compaction apart from the stress condition. Well known models were used to characterize the stressdependent resilient modulus. A model for prediction of permanent deformation was developed which together with the resilient modulus model were applied to the design of a light pavement structure composed of lateritic gravel base.
AFRIKAANSE OPSOMMING: Lateriete word wydverspreid gebruik in die trope as 'n padbou materiaal. Die materiaal word gebruik in ongebonde kroonlae, stutlae en oppervlaklae. Die meeste spesifikasies vir kroonlae vereis dat gegradeerde gebreekte klip of gestabiliseerde materiaal in die kroonlaag gebruik word. Die spesifikasies maak nie voorsiening vir lateriet en gruis wat natuurlik voorkom nie. Verskeie veldstudies in die verlede het duidelik getoon dat lateritiese materiaal met sukses gebruik kan word in die kroonlae van paaie wat ligte tot medium verkeer dra. Lateriete kan gebruik word sonder addidionele onkoste vir instandhouding en daar is merkbare kostebesparings wanneer plaveisels rehabiliteer word. Die verhouding tussen lateriet eienskappe, verkeerslas, omgewingsinvloede en plaveisel werkverrigting moet beter gedefinieer word deur verdere navorsing. In hierdie studie is omvattend gebruik gemaak van eenmalige en herhaalde belasting drie-assige toetse om die fundamentele gedrag van lateritiese materiaal te definieer. Hierdie toetse se resultate lewer inligting oor die skuifsterkte, spanning-vervorming eienskappe en gedrag onder herhaalde belasting. Die gruis wat gebruik is, is verkry vanaf 'n materiaalopslag by die leengroef van Malans Transport te Maaitjies Kuil naby Kaapstad. Die materiaal is getoets as granulêre materiaal en gestabiliseer met sement en skuim-bitumen. Die toetse is gedoen onder verskillende toestande van spanning, voginhoud en verdigting. Daar is bevind dat die veerkragtigheidmodulus van die lateritiese gruis nie net deur die aangewende spanning beïnvloed word nie, maar ook deur die voginhoud en verdigting van die materiaal. Welbekende modelle is gebruik om die spanningsafhanklike gedrag van die materiaal te karakteriseer. 'n Model is ook ontwikkel om die permanente vervorming van die materiaal te voorspel. Die twee modelle vir die veerkragtigheidsmodulus en permanente vervorming is gebruik om 'n ligte plaveiselstruktuur mee te ontwerp wat 'n lateritiese kroonlaag bevat.
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Brooks, Steven D. "Evaluation of the base test method for determining the strength of standing seam roof systems under gravity loadings." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/45958.
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The base tGSt method has been proposed by Carballo, Holzer and Murray [5] as a means of determining the strength of standing seam roof systems under gravity loading. The objective of this thesis is to evaluate the accuracy of the base test method. To do this, eleven sets of tests were performed at Virginia
Polytechnic Institute & State University (VPl&SU). Each test set consisted of a single span base test from which a failure load was predicted for the corresponding three span confirming test. Results of two test sets recorded in Reference [5] were also used to evaluate the method. A secondary objective of this thesis is to comment on the effects that system components (purlin orientation, clip type, bracing configuration, panel type, insulation and purlin type) have on the strength of the system. Results from proprietary tests conducted at VPI & SU were used in conjunction with the results from this research to accomplish the secondary objective.Master of Science
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Luk, Kapo Rose Maria. "A study of the applications of operational research in the planning and design of airports." Thesis, Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21128686.
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Pead, Justin Charles. "Research, design and construction of a team of Small Size League Soccer robots for RoboCup Soccer." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/5488.
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Includes abstract.Includes bibliographical references.
Small Size League (SSL) Soccer at RoboCup uses the complexity of a well kown human sport to extend the capabilities of mobile robotics as well as automated computer control. The game creates a environment where technically complicated miniature soccer robots are required to perform the tasks based on computer algorithms to outsmart similar systems. SSL creates a publically accessible window into complicated systems that an outsider is capable of comprehending.
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Hanid, M. B. "Design science research as an approach to develop conceptual solutions for improving cost management in construction." Thesis, University of Salford, 2014. http://usir.salford.ac.uk/32050/.
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Despite the progress that has been made with regard to construction cost management, many drawbacks including the unpredictability of construction costs continue to raise concerns. This research study aimed to contribute to improving construction cost management by identifying the key issues which contribute to such drawbacks, and developing conceptual solutions to mitigate them. The design science approach has been selected as the overall research method. Design science approach has been augmented through an analysis to the root cause of each identified key issue, an inference of countermeasure to the each root cause (conceptual solution), and synthesis of the (practical) solutions. This research has identified failure to forecast, failure to support improvement opportunities, costs being considered as resulting from action, neglect of value consideration, poor support for inter-organizational cost management, negative influence on behaviour, and constraints created by budgeting, as key issues contributing to the current drawback of construction cost management. This study proposes the recognition of waste through flow theory, integrating costs to design, value generation theory, seeing construction as production, incentives aligned to improvement, separating the different functions of budgeting and the dynamic approach to managing costs as solutions to the identified drawbacks. The outcomes of this study contribute to developing practical solutions for constriction cost management, and also represent conceptual gains in the field.
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Tanner, Brian Charles. "A center for sleep research at Emory University Hospital." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/24124.
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Bryant, David. "Design and prototyping of an aircraft to maximize the triaviation score." University of Western Australia. School of Mechanical Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0113.
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This thesis describes some of the processes and results obtained during the design and prototyping of a single seat experimental aircraft. The major aim was to maximise the Triaviation score of the aircraft. This score is a combination of the top speed, the stall speed and the rate of climb. The aircraft has been designed constructed, inspected and flown. The process of designing and prototyping is outlined in this thesis. Details are provided regarding preliminary design, numerical optimisation and the process of building the prototype. The aircraft registered VH-ZYY is a shoulder wing monoplane using a Continental IO-240 aircraft engine. The aircraft has a high power to weight ratio and light wing loading to assist it to climb well and fly slowly. Full span flaperons are used to increase the maximum coefficient of lift at the stall. The primary structure is aluminium with a carbon fibre and nomex cored cowl. All steel components have been formed with 4130 chrome molybdenum aircraft grade tubing. All hardware uses AN specification parts. VH-ZYY is registered in Australia as an Experimental aircraft.
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Lund, Ole. "Knowledge construction in typography the case of legibility research and the legibility of sans serif typefaces /." Thesis, Online version, 1999. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.301973.
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Kurichiyanil, Neeraj [Verfasser], Joachim [Akademischer Betreuer] Enders, and Markus [Akademischer Betreuer] Roth. "Design and construction of a test stand for photocathode research and experiments / Neeraj Kurichiyanil ; Joachim Enders, Markus Roth." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1124155163/34.
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Oliver, Gabriel. "A Wall Building." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/34951.
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This thesis investigates a constructive technique, within the materials and methods of conventional practice, which allows for a common building material such as concrete block to carry form and beauty. Furthermore, this project seeks to demonstrate the role human ingenuity, patience, attention, and perception can continue to play in architecture and construction.
The project focuses on an experimental wall type consisting of regular eight inch concrete half-block masonry units, stack-bonded in elevation and subtly transformed in plan to reveal a gradual shift of the exposed faces of the units. A wall was constructed at the Building Research and Demonstration Facility to investigate one example of this wall type.Master of Architecture
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DeLucia, Dominic. "A Parametric Study on Power Variation for Model Wind Turbine Arrays." PDXScholar, 2013. http://pdxscholar.library.pdx.edu/open_access_etds/1120.
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This thesis presents the results of wind tunnel experiments performed for various model wind turbine arrays. The aim is to understand how siting affects power output. To optimize wind farm efficiency the experiments vary the parameters of the model wind turbines and the layout of the wind turbine array. The parameters include the alignment, height, spacing, and the rotational direction of the model wind turbines. These experiments employ mechanical torque sensors to simultaneously measure the torque and rotor angular velocity, which yields a direct measurement of the fluid mechanical power extracted by the turbine at multiple locations. For a 4 × 3 array, the power is calculated at the center turbine in each of the rows. Variations in wind farm efficiency ranging from 55% to 90% are observed between the 13 different layouts tested. Modifications to the layout of the wind turbine array clearly affects the power output of the wind turbines downstream. The results of such experiments highlight the importance of studying the relationship between wind farm layout and power output.
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Yeh, Andy Ju-Chih. "Knowledge construction of 3D geometry in virtual reality microworlds." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16648/.
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The recent development of virtual reality (VR) technology carries powerful potential that can be utilised to facilitate the learning of 3D geometry. Therefore, a new approach for teaching and learning of 3D geometry that utilises a virtual reality learning environment (VRLE) is proposed in this research study. This research study aimed to: (a) design and evaluate a VRLE to facilitate the learning of 3D geometry concepts and processes by upper primary school students, and (b) generate theoretical and design principles that will have application both within and beyond the immediate research study. The research methodology employed was design experiments or design-based research. Informed by this methodology, the research design consisted of iterative cycles of developing/revising a conceptual framework, designing/prototyping a VRLE, enacting/evaluating the VRLE, and reflecting/redesigning the research. An initial conceptual framework was generated through extensive literature review to inform the design and evaluation of a VRLE. Based on the conceptual framework, a prototype VRLE named VRMath was then designed and implemented. The enactment and evaluation of VRMath consisted of two iterations. Iteration 1 (six hours/sessions with two students of Year 5 and 6) was conducted using the prototype VRMath (Yeh & Nason, 2004). Based on the findings from Iteration 1, nine learning activities were developed and research protocols (e.g., observation and interview) were revised for Iteration 2. Iteration 2 involved six primary school students (Year 4-5) for eight weeks (two hours/sessions per week). Findings from Iteration 2 confirmed and identified some usability issues of VRMath system and many new ways of thinking and doing 3D geometry when students interacted with VRMath. These have implications on the design of VRMath and the teaching and learning of 3D geometry within the VRMath environment. Justifications about the conceptual framework and students' learning within VRMath were made after the two iterations of enactment and evaluation. The learning activities and VRMath were also revised and redesigned for the preparation of future iterations. After a full cycle of the design-experiments, this research study concluded with a proto-theory (semiotic framework) for the design of and learning within VRLEs, and visions for using VRLEs in mathematic and technology education.
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Tillmann, Patrícia André. "A conceptual framework for improving value generation in complex construction projects." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/75905.
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Esta pesquisa foi motivada pela observação de um problema prático com potenciais contribuições teóricas. O problema em questão é a dificuldade de gerenciar projetos complexos de construção de modo que os objetivos estratégicos de sua implementação sejam alcançados, problema observado em um complexo programa de reestruturação urbana na cidade de Porto Alegre. Estudos indicam que nas últimas décadas houve um aumento na complexidade de gestão de projetos que resultou em desafios para as práticas gerenciais tradicionalmente adotadas. Alguns autores relacionam esse aumento de complexidade com uma demanda, cada vez maior, de compreender como projetos estão alinhados com os objetivos estratégicos e como irão contribuir para a geração dos benefícios esperados pelos diversos agentes intervenientes de um projeto. Dentro deste contexto, a falta de suporte dado pelas tradicionais praticas gerenciais é apontada. As críticas focam não só na falta de alinhamento estratégico e na dificuldade de gerenciar interesses conflitantes, mas também na dificuldade de lidar com a susceptibilidade desses projetos ao contexto politico, econômico e social no qual se inserem, e com a dinâmica desse contexto. Dentro deste contexto, foram identificadas duas abordagens gerenciais que emergem no contexto da construção civil em resposta às deficiências observadas: a Benefits Realisation Approach (BeReal) e o Lean Project Delivery System (LPDS). O foco da literatura existente sobre essas abordagens é predominantemente de caráter prescritivo, oferecendo modelos e métodos para sua aplicação. Identificou-se portanto a necessidade de avaliar a contribuição dessas abordagens para lidar com os desafios observados e contribuir para a melhoria do suporte a geração de valor em projetos complexos. Uma terceira abordagem, a Logical Framework Approach (LFA), utilizada no programa onde o problema foi identificado, também foi avaliada, pois é sugerido na literatura que ela oferece suporte para lidar com alguns aspectos da complexidade dos projetos. O processo de pesquisa envolveu as principais etapas de Design Science Research: encontrar um problema prático e com potencial para contribuição teórica, obter um entendimento deste problema, desenvolver ou identificar potencial solução, testar a solução, avaliando sua utilidade, e avaliar a contribuição teórica desta solução. Neste estudo, ênfase foi dada à avaliação das potenciais soluções identificadas. Três estudos empíricos foram realizados: o primeiro teve como objetivo entender o problema - programa de reestruturação urbana em Porto Alegre/Brasil; o segundo para avaliar as contribuições da adoção da BeReal em um programa de reestruturação de um campus hospitalar em Brighton/Inglaterra; e o terceiro para avaliar as contribuições do LPDS em um projeto de um hospital em San Carlos/Estados Unidos. Os três estudos apresentam diferentes contribuições gerenciais para o suporte a geração de valor em projetos complexos de construção. Tais contribuições são explicadas com base em um referencial teórico desenvolvido, formando um modelo conceitual que explica as mudanças necessárias no contexto de gestão de empreendimentos complexos para um melhor foco na geração de valor e como as diferentes praticas observadas e mecanismos de suporte contribuem para esta mudança.This research was motivated by a practical problem with potential theoretical contributions. The problem in hand is the difficulty to generate value in complex construction projects, a problem observed in a large urban regeneration programme in Porto Alegre. Past research indicate that in the last decades there was an increase in project complexity, posing challenges to traditional managerial practices. According to some authors, such complexity is partially due to an increasing concern to understand how project’s outputs contribute to generating change and delivering benefits to different stakeholder groups. Within this context, the lack of managerial support provided by traditional project management approaches is pointed out. Firstly because such approaches generally focus on the delivery of a physical product, within time and budget. Secondly, they do not provide support for dealing with the conflicting interests of multiple stakeholders. And thirdly because they do not properly consider that projects are susceptible to their economic, social and political context and subject to changes in such environment. In this research, two managerial approaches that are being used in the construction industry were identified as having potential contributions to improve value generation in complex projects: the Benefits Realisation Approach (BeReal) and the Lean Project Delivery System (LPDS). The literature available about these approaches is mainly prescriptive. Thus, there is still a need to understand why and how such approaches contribute for value generation. A third approach, the Logical Framework Approach (LFA) used where the problem was identified, was also analysed, as the literature suggests it also offers contributions to deal with some aspects of complexity. This research followed a Design Science Research process: finding a practical problem with potential theoretical contributions, framing the problem and searching for potential solutions, understanding how and why the solutions contribute for solving the problem and analyse the theoretical contributions of the solutions. In this study, emphasis was given to the evaluation of potential solutions identified. Three empirical cases were realised: the first one was in a urban regeneration programme in Brazil, aiming to understand the problem; the second was realised in a healthcare infrastructure programme in the UK, to analyse the adoption of BeReal; and the third in a healthcare infrastructure programme in the US, to analyse the adoption of LPDS. The three studies presented different managerial contributions to support value generation. Such contributions are analysed based on a conceptual framework that was devised. The model reveals the underlying concepts of observed managerial practices that contribute towards the improvement of value generation.
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Jones, Graham. "Thermal analysis and testing of a spaceborne passive cooler." Thesis, University of Oxford, 1994. http://ora.ox.ac.uk/objects/uuid:cef5bd18-c80d-442c-bb70-6414fdf29b61.
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This thesis describes the thermal design and thermal testing of the development model radiative cooler for the Composite Infra-Red Spectrometer (CIRS) due for launch on the Cassini spacecraft in 1997. The radiative cooler is used to cool the instrument's Focal Plane Assembly (FPA) to approximately 80K. The FPA holds two arrays of HgCdTe detectors for the mid infra-red spectrometer of the instrument which covers the wavelength range 7μm to 17μm. The FPA is mounted from the optics on a titanium alloy tripod and is cooled conductively by the radiator via a flexible link and a cold finger. A range of thermal models of the system have been developed ranging from a simple, analytical model to a finite difference numerical model. A calorimeter was designed to perform heat leak measurements on samples of Multi- Layer Insulation (MLI) blankets to determine the number and type of shields required for the MLI blanket covering the back of the cooler radiator. A test facility incorporating a vacuum system, a space simulator target, and a simulator for the CIRS instrument was designed and constructed for testing the assembled cooler. Various configurations of the Development Model (DM) CIRS cooler were tested as components became available and the results obtained compared to the thermal model predictions. It was found that the cooler will attain a temperature of 80K in operation, but with less excess cooling power than predicted by the thermal models.
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Sidler, Elizabeth D. "Ideal Learning Spaces: the Student Perspective." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801917/.
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Classrooms, libraries, student unions, and university campuses shape students’ learning experiences. These physical learning spaces set the stage for college student engagement and academic performance. Most of the research about the role of physical spaces in learning lacks the student perspective. The goal of this study was to offer a student-centered vision of ideal learning spaces. Students are the learners for whom learning spaces are designed, and this thesis examines the way students of one summer class at Oklahoma Baptist University conceptualized and interacted with their learning spaces. Data collection included surveys of the students, a focus group with members of the class, participant observation in the classroom, and interviews with students and the professor. Students viewed physical spaces as the backdrop for human action and chose spaces that supported their learning styles and goals. Students described supportive spaces as warm, purposefully crafted spaces, and full of other people who were seriously pursuing the same goals. This thesis explores the ways students conceptualized and interacted with learning spaces as a network of support for their learning and provides recommendations for the design of learning spaces that facilitate this support.
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Sarrafzadeh-Khoee, Adel. "Small displacement measurement in ultrasound: quantitative optical noncontacting detection methods." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/76498.
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In this study the description and development of intensity-based laser interferometric techniques for the detection and measurement of ultrasonic stress waves and their small displacement amplitudes is presented. The dynamic displacement sensitive interferometers described in the following chapters allow the quantitative point-by-point measurement of both in-plane and out-of-plane components of surface displacement motion.
These uniquely developed interferometric sensors are:
1) an optical system design for the detection of the surface acoustic wave (Rayleigh wave). The technique is based on the Fourier analysis of coherent light and diffraction imaging properties of an illuminated grating;
2) the design and construction of a two-beam unequal-path laser interferometer for the measurement of out-of-plane surface displacement of ultrasonic waves;
3) extension of a flexible fiber optic probing device which is optically coupled to the test arm of the above two-beam interferometer. This permits scanning of the test surface which may be at some distance from the main optical system components;
4) the design and construction of a laser speckle interferometer for retro-reflective diffusing surfaces in which the in-plane displacements of the ultrasonic wave are interrogated.
The inherent advantages of these newly designed optical configurations in terms of their greater simplicity, feasibility, and sensitivity over the conventional counterparts (classical/speckle laser interferometers) are explained. The function-response limitations of these interferometric sensors on lateral displacement resolution, on upper and lower-bound displacement sensitivity (dynamic range), on high-frequency bandwidth probing capability, on low-frequency environmentally associated noise disturbance, and on specularly reflective or diffusively retro-reflective specimen surface preparation are also mentioned.
Finally, in a series of experimental observations, the application of a couple of these acoustic sensors in pulsed-excitation ultrasonic Specifically, the optically testing methods is cited. detected ultrasonic signals revealing the true nature of the various surface displacement modes of vibration are presented.Ph. D.
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King, Jonathan Lee. "Deployable Infrastructure in Support of Science and Education." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/76890.
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P.L.U.G. is a prototypical solution to a highly specialized design problem that emerged in support of remote biological field research in the Mahale mountains of Western Tanzania. In collaboration with researchers from the Virginia Maryland Regional College of Veterinary Medicine's (VMRCVM) Bush to Base Bioinformatics(B2B) group a team of students and faculty from the Virginia Tech School of Architecture + Design designed, constructed, tested, and deployed the mobile field laboratory which houses up to four researchers and includes clean laboratory space, living accommodation, autonomous electricity generation, and a satellite-based communications network. P.L.U.G. consists of two primary elements, a rigid enclosed laboratory and fabric super structure that are constructed using a series of functionally-complex building components that are designed to be carried and assembled by two researchers, in one day, without the use of tools. (Kaur etal. 2007) The resulting system can be mass produced and utilized in the establishment of infrastructure in remote, environmentally sensitive, and unstable environments and has implication in disaster relief housing, human heath stations, remote research, mobile educational facilities, and any other environment or event that requires rapidly deployable, self-sufficient infrastructure.
The prototype laboratory was successfully deployed during the summer of 2007 and has been field tested by the Virginia Maryland College of Veterinary Medicine (VMRCVM) Bush-2-Base Bioinformatics (B2B) research group. Currently the laboratory program exists as part of a newly developed long-term research initiative surrounding Deployable Infrastructure in Support of Science and Education (DISSed Lab) initiated by the author in response to perceived demand for such accommodation.Master of Science
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Turkoglu, Danyal J. "Design, Construction and Characterization of an External Neutron Beam Facility at The Ohio State University Nuclear Reactor Laboratory." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1325228897.
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Hao, Kecheng. "Equivalence Checking for High-Assurance Behavioral Synthesis." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1066.
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The rapidly increasing complexities of hardware designs are forcing design methodologies and tools to move to the Electronic System Level (ESL), a higher abstraction level with better productivity than the state-of-the-art Register Transfer Level (RTL). Behavioral synthesis, which automatically synthesizes ESL behavioral specifications to RTL implementations, plays a central role in this transition. However, since behavioral synthesis is a complex and error-prone translation process, the lack of designers' confidence in its correctness becomes a major barrier to its wide adoption. Therefore, techniques for establishing equivalence between an ESL specification and its synthesized RTL implementation are critical to bring behavioral synthesis into practice.
The major research challenge to equivalence checking for behavioral synthesis is the significant semantic gap between ESL and RTL. The semantics of ESL involve untimed, sequential execution; however, the semantics of RTL involve timed, concurrent execution. We propose a sequential equivalence checking (SEC) framework for certifying a behavioral synthesis flow, which exploits information on successive intermediate design representations produced by the synthesis flow to bridge the semantic gap. In particular, the intermediate design representation after scheduling and pipelining transformations permits effective correspondence of internal operations between this design representation and the synthesized RTL implementation, enabling scalable, compositional equivalence checking. Certifications of loop and function pipelining transformations are possible by a combination of theorem proving and SEC through exploiting pipeline generation information from the synthesis flow (e.g., the iteration interval of a generated pipeline). The complexity brought by bubbles in function pipelines is creatively reduced by symbolically encoding all possible bubble insertions in one pipelined design representation. The result of this dissertation is a robust, practical, and scalable framework for certifying RTL designs synthesized from ESL specifications. We have validated the robustness, practicality, and scalability of our approach on industrial-scale ESL designs that result in tens of thousands of lines of RTL implementations.
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Hákonardóttir, Halla. "The Role of the Hole." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-519.
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The design project presented here explores the relation between body and a garment. It is concerned simultaneously with the fundamental notion of a garment and the act of dressing. The project can be contextualized as a constructive design research since the aim does not involve analysis of the material world nor rational problem solving. Rather, the aim is to create new imaginary realities, and visualize them. As a startup method to construct a theory, workshops were set up using life size vertical action collages, in order to integrate the act of dressing with the aim to develop a new construction method. Two actors, one of them myself, were used to provide a greater diversity of perspectives and interpretations. A method of dressing which involved interlocking the body - limbs and waist - with vertically hanging textiles, was developed through the search for the holes, that constitute the infrastructure of a garment. The results are both artefacts, that visualize the new garment construction as well as a new routine of dressing through the novel method of garment construction. Dressing a body in textiles through interlocking which results in an intimate connection between body and the garment as the body reacts to the garment and vice versa. The motivation for exploring the act of dressing is an urge to reflect upon the fast evolving society of today which tends to emphasize a static relationship between body and a garment.
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Gloudemans, James R. "Filleting of aircraft components using non-uniform B-spline surfaces." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44637.
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Conceptual and preliminary aircraft design codes have different geometry requirements. Conceptual design codes use component based models, while preliminary design codes require a more complete and integrated geometry. An automatic procedure to convert between the two types of models would prevent geometry inconsistencies and speed up the design process. This thesis describes some of the concepts and algorithms necessary to develop such a procedure. Specifically, the theory and development of C2 continuous fillets between aircraft components is discussed. B-spline surface generation from conceptual geometry data and the relimiting of e surfaces is also presented. Master of Science
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Witham, Philip James. "Pinhole Neutral Atom Microscopy." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1407.
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This work presents a new form of microscopy, the instrument constructed to demonstrate it, the images produced and the image contrast mechanisms seen for the first time. Some of its future scientific potential is described and finally, recent work towards advancing the method is discussed.
Many forms of microscopy exist, each with unique advantages. Of several broad categories that they could be grouped into, those that use particle beams have proven very generally useful for micro and nano-scale imaging, including Scanning Electron, Transmission Electron, and Ion Beam microscopes. These have the disadvantage, however, of implanting electric charges into the sample, and usually at very high energy relative to the binding energy of molecules. For most materials this modifies the sample at a small scale and as we work increasingly towards the nano-scale, this is a serious problem.
The Neutral Atom Microscope (NAM) uses a beam of thermal energy (under 70 meV) non-charged atoms or molecules to probe an atomic surface. For several decades scientists have been interested in this possibility, using a focused beam. Scattering of neutral atoms provides a uniquely low-energy, surface-sensitive probe, as is known from molecular beam experiments.
We have developed a new approach, operating with the sample at a close working distance from an aperture, the need for optics to focus the beam is obviated. The demonstrated, practical performance of this "Pinhole" NAM exceeds all other attempts by great lengths by many measures. The unique images resulting and contrast mechanism discoveries are described. The future potential for nano-scale resolution is shown.
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Ashton, Sean James [Verfasser], Matthias [Akademischer Betreuer] Arenz, Moniek [Akademischer Betreuer] Tromp, and Ulrich K. [Akademischer Betreuer] Heiz. "The Design, Construction and Research Application of a Differential Electrochemical Mass Spectrometer (DEMS) / Sean Ashton. Gutachter: Matthias Arenz ; Moniek Tromp. Betreuer: Ulrich K. Heiz." München : Universitätsbibliothek der TU München, 2011. http://d-nb.info/1015029949/34.
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Williamson-Leadley, Sandra. "Setting up and implementing a class for Year 4 to 6 students on the design, evaluation and construction of web pages from a multiple intelligences perspective : an action research study : research report." Thesis, University of Canterbury. School of Educational Studies and Human Development, 2001. http://hdl.handle.net/10092/2931.
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The purpose of this action research study was to find out what considerations, from a
multiple intelligences perspective, need to be taken into account when setting up and
implementing a class on the design, evaluation and construction of web pages by Year 4
to 6 students. The teaching sessions are the first cycle in implementing classes for
constructing web pages to showcase the work and activities that form part of the
respective classroom programmes. The process included teaching the participants about
the eight modes of intelligence as defined in Howard Gardner's Multiple Intelligences
theory, developing criteria for evaluating web pages from a multiple intelligences
perspective, as well as teaching the skills needed to utilise the software programs to
create their web pages. Despite the intended focus on content and viewing it from a
multiple intelligences perspective, technical skills for creating the web pages gained
precedence. Giving students the opportunity tq demonstrate their learning, using ICT, in
a way that best reflects the way or the intelligence modes they use to construct meaning
has implications for educators and students. The gaining of technical skills, associated
with emphasis on utilising ICT, needs to be balanced with the importance of the content
and construction of meaning.
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McLaughlin, Logan M. "Understanding Road Use and Road User Interaction: An Exploratory Ethnographic Study Toward the Design of Autonomous Vehicles." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849632/.
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This thesis contributes to research that informs the design of autonomous vehicles (AVs). It examines interactions among various types of road users, such as pedestrians and drivers, and describes how findings can contribute to the design of AVs. The work was undertaken as part of a research internship at Nissan Research Center-Silicon Valley on the Human Understanding in Design team. Methods included video ethnography “travel-alongs” which captured the experience of travel from the point of view of drivers and pedestrians, analysis of interaction patterns taken from video of intersections, and analysis of road laws. Findings address the implications of what it will mean for AVs to exist as social entities in a world of varied road contexts, and how AVs might navigate the social act of driving on roads they share with a variety of human users. This thesis contributes to an emerging body of research and application on the subject of the AV in the world.
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Griffis, Brent Patrick. "Multi-Criteria Decision Modeling for Best Value Selections in Target Value Design Integrated Project Delivery." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1729.
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Integrated Project Delivery (IPD) combined with Target Value Design (TVD) is a better way to deliver value for the client than traditional guaranteed maximum price (GMP) methods. With traditional GMP delivery methods, the interests of the parties are often at odds. The goal of IPD is to align all party interests in order to achieve a win-win scenario. Due to the aligning nature of IPD and the fact that each party’s success is dependent on achieving the project objectives as a whole; a non-biased, transparent, decision-making process is necessary in order to deliver the project objectives within the constraints of the TVD. Thus delivering the expected value for the client and ensuring that all parties achieve project success. The need for this transparent decision-making process is compounded by the fact that a “target” based system rapidly declines to a less than optimal state if there is no unbiased decision-making process in place. If we treat the entire lifespan of a project as the complex system that it is, we can begin to take advantage of the hierarchical nature of complex systems. The goal of this paper is to show that by modeling the life span of a project through a multi-criteria decision making model, built on a hierarchical framework will allow you to find a non-inferior solution to your TVD. I’m proposing to use Hierarchical Holographic Modeling (HHM) as the framework for an Analytical Hierarchical Process (AHP) multi-criteria decision-making model complete with post-optimality analysis as the preferred project management method.
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Gustafsson, Rikard, and Andreas Blomqvist. "PRODUCT SERVICE SYSTEMS AND MODULAR DEVELOPMENT : Implications and Opportunities in the Construction Equipment Industry." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5364.
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Volvo Construction Equipment is considering applying modular design to their organisation in order to constrain the growing intangible information and parts assortment within the company, and as well to enable a rearrangement of production, sales and logistics in the near future of organisational growth and industrial footprint. Hence the purpose of this thesis is to investigate the opportunities and threats of implementing modular design to Volvo Construction Equipment. The analysis is scoped on the generic aspects of modularity and the organisational weaknesses within Volvo CE towards implementing a new organisational structure, product design and production with modular design. Modularity enables the company to move towards decupling the constraints of tangible sales and provides an opportunity to offer Product Service Systems as a Total Solution for each individual customer. By implementing the authors common knowledge and education within engineering revolving tangible and intangible products and services alongside with innovation, together with informal interviews of stakeholders, the results of the thesis was reached. The analysis of the results was reached by implementing Design Research Methodology to the structure of the thesis, research method and interviews made. There is a distinct opportunity for Volvo CE to implement modular design since the informational flows, innovation, research and development is enhanced by a correct modular design. Although there is a distinct risk in changing a well-established product design, development process and organisational structure, the opportunities to create a product service system strategy and to re harvest and recycle value within the company with modularity outweigh the risk. Incomprehension of how to optimize a modular design may amplify the reasons why Volvo CE is considering revising their products and organisation with modularity, thus the authors recommend implementing a generic and specific education in modularity within Volvo CE to ensure a shared language of modularity and enhance traceability of the development within the company. In order to enhance the organisational velocity around development, the authors also recommend a new computer environment which enables the different disciplines of engineering and marketing to modularise the product, services and processes while keeping the comprehension of the subject close to hand. This enables the organisational structure to change and improve towards modular deployment and to further accelerate Volvo CE’s growth, market share and revenue.Volvo Construction Equipment överväger att tillämpa en modulär design till sin organisation i syfte att begränsa den växande immateriella information och det växande sortiment av delar inom företaget som finns idag. Volvo ser även till möjligheterna med modulär design för att möjliggöra en omflyttning av produktion, försäljning och logistik inom den närmaste framtiden för organisatorisk tillväxt och för att minska det industriella fotavtrycket. Därav syftet med denna uppsats; att undersöka möjligheter och hot för att genomföra modulär design i Volvo Construction Equipment. Analysen är fokuserad på generiska aspekter på modularitet och organisatoriska svagheter inom Volvo CE mot att genomföra en ny organisationsstruktur, produktdesign och produktion med modulär design. Modularitet möjliggör för företaget att gå mot att minska begränsningen av materiell försäljning och ger en möjlighet att erbjuda system med Product och Service lösningar som en helhetslösning för varje enskild kund. Genom att implementera författarnas gemensamma kunskap och utbildning inom teknik roterande kring materiella och immateriella produkter samt tjänster tillsammans med innovation, och med informella intervjuer av intressenter, har resultaten i denna avhandling uppnåtts. Analysen av resultaten uppnåddes genom att implementera metodiken Design Research Methodology till strukturen, forskningsmetod och gjorda intervjuer i avhandlingen. Det finns en tydlig möjlighet för Volvo CE att genomföra modulär design eftersom de informativa flöden, innovation, forskning och utveckling förstärks av en korrekt modulär design. Även om det finns en klar risk i att ändra en väletablerad produkts design, utveckling process och organisations struktur, är möjligheterna i att skapa en produkt strategi med servicesystem och att återvinna återvinna värde i företaget med modularitet väl värt risken. Oförståelse för hur man optimerar en modulär design kan innebära ytterligare risker och förklarar varför Volvo CE överväger revidera sina produkter och organisation med en ny design, och då kanske en modulär struktur. Detta har lett till att författarna rekommenderar att genomföra en allmän och specifik utbildning i modularitet inom Volvo CE för att säkerställa ett gemensamt språk för modularitet och öka spårbarheten av utvecklingen inom företaget. För att öka den organisatoriska hastigheten kring utveckling, rekommenderar författarna också en ny datormiljö som gör att de olika disciplinerna i teknik och marknadsföring ligger närmre till hands för att modularisera produkter, tjänster och processer samtidigt som förståelsen av ämnet blir enklare att uppnå. Detta maximerar effektiviteten i den organisatoriska strukturen för att förändra och förbättra mot en modulär utbyggnad och att ytterligare påskynda Volvo CE : s tillväxt , marknadsandelar och intäkter
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Johannisson, Wilhelm. "Light Weight Suspension System for KTH Research Concept Vehicle : DESIGN AND CONSTRUCTION OF A COMPOSITE SUSPENSION SYSTEM WITH FOCUS ON APPLICATION IN KTH RESEARCH CONCEPT VEHICLE WITH ANALYSIS OF FUTURE SOLUTIONS SUITABLE FOR THE AUTOMOTIVE INDUSTRY." Thesis, KTH, Lättkonstruktioner, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-223389.
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I detta projekt undersöks konstruktionen av en transversell bladfjäder föranvändning i en bil, byggd i kompositmaterial. En transversell bladfjäder är en annanlösning för att implementera det som traditionellt är spiralfjäder i bilenhjulupphängning. Istället används en fjäder som fungerar genom balkböjning. Detfinns sedan tidigare flera olika lösningar på hur sen sådan bladfjäder kan fungera,däribland lösningar där bladfjädern sträcker sig från sida till sida på bilden ochdärmed kallas transversell bladfjäder. Denna lösningen har även den extraegenskapen att bladfjädern fungerar som en krängningshämmare för bilen.Den transversella bladfjädern konstrueras för en forskningsbil på Kungliga TekniskaHögskolan (KTH). Denna bil är ett konceptfordon konstruerat för att efterlikna enliten stadsbil och väger ca. 600 𝑘𝑔. Hjulupphängningen på denna bil är av typenDouble Wishbone med spiralfjädrar och dämpare. Hjulupphängningen ärkonstruerad modulärt och är exakt densamma för fram och bak hjulupphängning,och ursprungliga fästpunkter på bilen hålls intakta. Konstruktionen av dentransversella bladfjädern görs för att efterlikna de egenskaper som det ursprungligasystemet för hjulupphängningen.Analytisk optimering används primärt för att hitta en första lösning, sedanimplementeras denna lösning i FEM-programvara för att vidare undersöka dessegenskaper och konstruktion. Detta leder fram till en slutgiltig lösning som uppfyllerkravspecifikationerna, varvid en fullskalig transversell bladfjäder byggs och prövasom den uppfyller kravspecifikationerna.In this project, the design of a transverse leaf spring for an automotive vehicle isinvestigated. A transverse leaf spring is a concept for implementing the traditionalcoil spring for the vehicle, into a spring operating through beam bending. There aredifferent constructions and layouts of said leaf spring developed previously. Onesolution is where the spring is spanning from one side to the other of the vehicle,making it a transverse leaf spring. This solution has an extra gain; it is also providingan anti-roll bar action to the ride characteristics of the vehicle.The design of the transverse leaf spring is made for an automotive research vehicle atRoyal Institute of Technology (KTH). This vehicle is designed to represent a smallcity vehicle, weighing approximately 600 𝑘𝑔. The design of the original suspensionsystem is of the type Double Wishbone with push rod and coil springs with damper.The system is modular and exactly the same for the front and rear of the vehicle.Original mounting positions on the vehicle are to be kept intact. The design of thetransverse leaf spring is made in order to mimic the exact characteristics of theoriginal suspension system.First analytical optimizations are made in order to find an initial solution. This designis then implemented in FEM-software in order to further investigate thecharacteristics and design. A final design is found that is fulfilling the requirementsand a full scale version of the transverse leaf spring is built and examined withregards to its fulfilment of requirements.
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Ahiakwo, Ograbe A. "Improving construction processes in Nigeria using the Last Planner® System." Thesis, University of Wolverhampton, 2015. http://hdl.handle.net/2436/344319.
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This thesis describes a research investigation into the implementation of the Last Planner System (LPS) in Nigeria, to improve construction processes within the Nigerian construction industry. LPS is known to be the most developed practical use of Lean Construction. It focuses on minimising the negative impacts of variability, uncertainties, buffers, making projects more predictable, creating reliable work plans and convalescing collaborative planning. However, the Nigerian construction industry is associated with a number of challenges which impair its performance. These challenges were grouped and classified into six major barriers: these include: supervision and quality control, fluctuation and variations, subcontractor involvement, resistance to change, cultural issues, and lengthy approvals. Consequently, a Design Science Research (DSR) approach is adopted to evaluate the effectiveness of implementing LPS in construction projects in Nigeria. In order to achieve this aim, an Action Research strategy is adopted and three case studies are reported; two of these cases describe how LPS was successfully implemented in construction projects within Nigeria. While the third case involved an investigation into the state of production plan reliability, of a successful project in Nigeria. These projects were selected based on non-probabilistic sampling from different geographical locations in Nigeria to represent different kinds of construction projects within the country. The first and second cases involved the implementation of LPS within the construction of a prototype student’s hostel and the construction a 4 Kilometre single carriageway road respectively. The third on the other hand involved the construction of a multipurpose hydro-power dam project; where comparisons were made between typical LPS projects and the project management techniques applied within the project. Data was collected through observation site activities, interviews, documentary analysis and questionnaire survey. The data generated was subsequently analysed by means of content analysis and evaluated in terms of its reliability, validity, representativeness, flexibility, rigour and reflexivity. In view of the LPS implementation within the two case studies, six barriers were identified and classified together with the six barriers associated with the Nigerian Construction industry. These barriers were linked, measured and ranked in averages of their degrees of occurrences. It was revealed that the major barriers were cultural issues and resistance to change, while the others include; lengthy approval, subcontractor’s involvement, poor supervision and quality, fluctuations and variations. Hence, a framework was developed to mitigate these barriers, when implementing LPS in construction projects in Nigeria. The main steps of the framework include: the need to identify purpose; the need to identify stakeholders impact; the need to obtain Sponsorship; the need to build a cross functional team; the need to create measurement indices; the need for training on Lean techniques and LPS; and finally the need to create a right working climate. Furthermore a focus group between construction practitioners was organised to test and evaluate the framework developed. It was revealed from the focus group that the framework has the potential to facilitate the implementation process as proposed.
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林煜 and Yuk Lam. "Hong Kong Science Park." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31982001.
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Jensen, Deron Eugene. "System-wide Performance Analysis for Virtualization." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/1789.
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With the current trend in cloud computing and virtualization, more organizations are moving their systems from a physical host to a virtual server.
Although this can significantly reduce hardware, power, and administration costs, it can increase the cost of analyzing performance problems. With virtualization, there is an initial performance overhead, and as more virtual machines are added to a physical host the interference increases between various guest machines. When this interference occurs, a virtualized guest application may not perform as expected. There is little or no information to the virtual OS about the interference, and the current performance tools in the guest are unable to show this interference.
We examine the interference that has been shown in previous research, and relate that to existing tools and research in root cause analysis. We show that in virtualization there are additional layers which need to be analyzed, and design a framework to determine if degradation is occurring from an external virtualization layer. Additionally, we build a virtualization test suite with Xen and PostgreSQL and run multiple tests to create I/O interference. We show that our method can distinguish between a problem caused by interference from external systems and a problem from within the virtual guest.
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Havenga, Marica. "The relationship between career adaptability and academic achievement in the course of life design counselling." Diss., University of Pretoria, 2011. http://hdl.handle.net/2263/27244.
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The purpose of this study was to explore and describe the relationship between top academic achievement in Grade 12 and certain characteristics of career adaptability. The career construction theory and the counselling model for life designing constituted the theoretical framework for the study. This research study of limited scope was conducted according to an interpretivist metatheoretical paradigm. I followed a qualitative methodological paradigm based on a case study design. Purposive sampling was used to select participants according to their top academic achievement. A very important factor in all case studies is the collection of data from multiple sources. Therefore, data collection methods included the Career Adapt-Abilities Inventory, individual interviews, life line and life story. A deductive style of analysis was used to identify themes (concern, control, curiosity, confidence). Inductive analysis was used to identify subthemes. Based on the findings of the study the salient aspects of career adaptability were established as being concern, control, curiosity and confidence. The importance of career adaptability when negotiating change was demonstrated by participants in their orientation and preparation for the future, making decisions after careful planning and exploration, and seeking information, as well as having confidence in their own ability and choices. Finally the findings of my research study suggest a significant relationship between Grade 12 top academic achievement and certain characteristics of career adaptability. Additionally findings suggest that other variables such as participation in extracurricular activities, gender, race and socioeconomic circumstances should not be excluded and therefore need to be investigated further. CopyrightDissertation (MEd)--University of Pretoria, 2011.
Educational Psychology
unrestricted
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Delfs, Holger. "A magneto-optic trap for rubidium." Thesis, 1992. http://hdl.handle.net/1957/36460.
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Shyu, Jia-Shiow, and 徐佳琇. "Research on construction of minimum aberration design." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/5m4k2w.
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碩士國立中央大學
統計研究所
94
The purpose of Design of Experiments is to find out factors and interactions that affect response by experiment. If experimenters arrange factors arbitrarily on the orthogonal array, it may be occur that the effects are aliased. So a key question is how to choose a fraction of the orthogonal array to arrange factors. The experimenters always use the minimum aberration design that can be estimate the most main effects. According to the minimum aberration criterion, Chen, Sun & Wu (1993) propose an algorithm for constructing complete catalogue of fractional factorial designs. The issue of this studying is to construct minimum aberration design easily and directly without referring CSW＇s catalogue. Therefore, we choose fraction of the orthogonal array to be basic construction, and propose two methods to construct the minimum aberration design.
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Lin, Wen-Pin, and 林文斌. "The Research on Design-Build Construction Cost Management." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/kuy7nx.
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碩士國立交通大學
工學院工程技術與管理學程
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In the traditional construction tender project, the cost management operations of the project rely on the owner's specifications and design drawings to estimate and control. However, in the Design-Build project, because the rights and obligations of design are within the Design-Build team, the project needs to be gradually carried out along with the completion of the design work. The builders often lose the original cost management operations due to the failure to have perfect plans. In the past cases, the construction company often found that the design results could not be applied in the site or the design team over-designed and then caused losses, but it was not able to ask the owner's for additional funds because of the characteristics of the Design-Build contract. This arises the dispute within the team and even affects the progress of the project and consequently damages the rights and interests of the owners. This study explores the key work of the Design-Build project preparation process from the perspective of the construction company, and through the implementation of design management conducts risk review to build the beginning source of cost management, and then establishes the execution way of project budgeting and cost control as a reference to the industry.