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1
Avén, Joakim. "Analysis of the Z-wing configuration." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-12135.
Повний текст джерелаАнотація:
This thesis will analyze the Z-wing configuration. The Z-wing configuration is basically an airplane that has one of the wings placed at the forward section of the fuselage and the other wing placed on the other side far aft at the fuselage. This configuration creates a lot of different and unwanted forces and moments due to a differential in lift and drag between both the wings and the main objective with this thesis is to get a Z-wing to fly straight and level flight without these strange and unwanted forces and moments over it. Therefore the contribution of the wings different parameters to different moments and forces have been mapped out. Parameters such as the angle of incidence, wing span, dihedral, placement of wings etc. All the calculations done regarding the aerodynamic forces on the Z-wing have been performed in the Tornado, which is a program that runs in MATLAB and uses Vortex Lattice Method for its calculations. The outcome was that a steady level flight was possible. The configuration does have a lot of disadvantages. It will be very difficult to control in pitch, yaw and roll, although a backwards sweep of the front wing and a backwards sweep of the aft wing made roll control much better.
2
Nelson, Tim. "First-Order Models for Configuration Analysis." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/452.
Повний текст джерелаАнотація:
Our world teems with networked devices. Their configuration exerts an ever-expanding influence on our daily lives. Yet correctly configuring systems, networks, and access-control policies is notoriously difficult, even for trained professionals. Automated static analysis techniques provide a way to both verify a configuration's correctness and explore its implications. One such approach is scenario-finding: showing concrete scenarios that illustrate potential (mis-)behavior. Scenarios even have a benefit to users without technical expertise, as concrete examples can both trigger and improve users' intuition about their system. This thesis describes a concerted research effort toward improving scenario-finding tools for configuration analysis. We developed Margrave, a scenario-finding tool with special features designed for security policies and configurations. Margrave is not tied to any one specific policy language; rather, it provides an intermediate input language as expressive as first-order logic. This flexibility allows Margrave to reason about many different types of policy. We show Margrave in action on Cisco IOS, a common language for configuring firewalls, demonstrating that scenario-finding with Margrave is useful for debugging and validating real-world configurations. This thesis also presents a theorem showing that, for a restricted subclass of first-order logic, if a sentence is satisfiable then there must exist a satisfying scenario no larger than a computable bound. For such sentences scenario-finding is complete: one can be certain that no scenarios are missed by the analysis, provided that one checks up to the computed bound. We demonstrate that many common configurations fall into this subclass and give algorithmic tests for both sentence membership and counting. We have implemented both in Margrave. Aluminum is a tool that eliminates superfluous information in scenarios and allows users' goals to guide which scenarios are displayed. We quantitatively show that our methods of scenario-reduction and exploration are effective and quite efficient in practice. Our work on Aluminum is making its way into other scenario-finding tools. Finally, we describe FlowLog, a language for network programming that we created with analysis in mind. We show that FlowLog can express many common network programs, yet demonstrate that automated analysis and bug-finding for FlowLog are both feasible as well as complete.
3
Kuna, Tobias. "Studies in configuration space analysis and applications." Bonn [Germany] : Rheinischen Friedrich-Wilhelms-Universität, 1999. http://catalog.hathitrust.org/api/volumes/oclc/45762540.html.
Повний текст джерела
4
Marchesi, Chiara. "Conformational analysis and absolute configuration of Spiropyrazolones." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13968/.
Повний текст джерелаАнотація:
The relative configuration of the four stereocenters of spiropyrazolones 1, epi-1 and 2 was determined by NMR-NOE analysis. It turned out that while compound 1 has the 1R*, 2S*, 3R*, 4S* relative configuration, epi-1 is the diastereoisomer at the C-4 (1R*, 2S*, 3R*, 4R* relative configuration). A full conformational analysis was performed by Molecular Mechanics (MMFF field) scan of the potential energy surface, and the best conformations were optimized by DFT calculations, including the effect of the solvent in the calculations. The absolute configuration of the three compounds was then determined by the comparison of the Electronic CD spectra with the simulated spectra obtained by TD-DFT calculations. Four different functionals were used to achieve data redundancy and a more reliable assignment. The 1R, 2S, 3R, 4S absolute configuration was determined for 1, the 1R, 2S, 3R, 4R for epi-1 and the 1S, 2R, 3S, 4R for compound 2.
5
Perez, Caceres Leslie. "Automatic Algorithm Configuration: Analysis, Improvements and Applications." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/262048.
Повний текст джерелаАнотація:
Technology has a major role in today’s world. The development and massive access to information technology has enabled the use of computers to provide assistance on a wide range of tasks, from the most trivial daily ones to the most complex challenges we face as human kind. In particular, optimisation algorithms assist us in taking decisions, improving processes, designing solutions and they are successfully applied in several contexts such as industry, health, entertainment, and so on. The design and development of effective and efficient computational algorithms is, thus, a need in modern society.Developing effective and efficient optimisation algorithms is an arduous task that includes designing and testing of several algorithmic components and schemes, and requires considerable expertise. During the design of an algorithm, the developer defines parameters, that can be used to further adjust the algorithm behaviour depending on the particular application. Setting appropriate values for the parameters of an algorithm can greatly improve its performance. This way, most high-performing algorithms define parameter settings that are “finely tuned”, typically by experts, for a particular problem or execution condition.The process of finding high-performing parameter settings, called algorithm configuration, is commonly a challenging, tedious, time consuming and computationally expensive task that hinders the application and design of algorithms. Nevertheless, the algorithm configuration process can be modelled as an optimisation problem itself and optimisation techniques can be applied to provide high-performing configurations. The use of automated algorithm configuration procedures, called configurators, allows obtaining high-performing algorithms without requiring expert knowledge and it enables the design of more flexible algorithms by easing the definition of design choices as parameters to be set. Ultimately, automated algorithm configuration could be used to fully automatise the algorithm development process, providing algorithms tailored to the problem to be solved.The aim of the work presented in this thesis is to study the automated configuration of algorithms. To do so, we formally define the algorithm configuration problem and analyse its characteristics. We study the most prominent algorithm configuration procedures and identify relevant configuration techniques and their applicability. We contribute to the field by proposing and analysing several configuration procedures, being the most prominent of these the irace configurator. This work presents and studies several modifications of the configuration process implemented by irace, which considerably improve the performance of irace and broaden its applicability. In a general context, we provide insights about the characteristics of the algorithm configuration process and techniques by performing several analyses configuring different types of algorithms under varied situations. And, finally, we provide practical examples of the usage of automated configuration techniques showing its benefits and further uses for the application and design of efficient and effective algorithms.Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
6
Williams, Robert L. "Planar robotic mechanisms: analysis and configuration comparison." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/54462.
Повний текст джерелаАнотація:
Robotic mechanisms are defined in this dissertation to be closed-loop, in-parallel actuated mechanical devices possessing several degrees-of-freedom. Parallel robotic mechanisms have recently received attention in the robotics literature as a potential alternative to the existing serial industrial robot. Serial robots are in a cantilever configuration which makes them relatively compliant and Ieads to poor accuracy. Many serial manipulators have motors that are carried on moving links which limits dynamic performance. Robotic mechanisms are in a parallel configuration which provides excellent stiffness, load-bearing, and accuracy. Robotic mechanisms combine the advantages of serial robots and closed-loop single-degree-of-freedom mechanisms to form a versatile new robotic tool.
This dissertation presents theoretical kinematic analysis and design of planar robotic mechanisms. The topics covered are type and number synthesis, kinematic position solution, velocity and acceleration analysis, kinetostatic analysis, workspace optimization, and link interference avoidance. Throughout this work, comparisons are made among three general manipulator configurations: serial, parallel-serial, and fully parallel. Strengths and limitations are discussed for each configuration type.
This investigation provides the analytical foundation for implementation of planar robotic mechanisms. Closed-form solutions to the kinematic position, velocity, and acceleration problems are presented. Manipulator reachable hand areas are maximized. An underlying theme of this work is tradeoffs between competing factors relating to various configurations of parallel robotic mechanisms; these tradeoffs are important design considerations. The recommendation of this dissertation is to pursue practical development of robotic mechanisms for general industrial manipulation tasks.Ph. D.
7
Ellingsæter, Jenny Marie, and Frode Sandholtbråten. "Algorithms and Approaches for Configuration-less Log Analysis." Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9095.
Повний текст джерелаАнотація:
System logs contain messages from a wide range of applications. They are the natural starting point when troubleshooting a system. The usual approach for analysing system logs is to write a number of regular expressionsto match specific keywords and events. When the number of expressions grows large, the analysis solution becomes unmaintainable. In addition, the use of regular expressions requires the system administrator to have extensive knowledge of the system at hand. This thesis presents methods for performing log analysis without regular expressions. This is an area of system administration that has attracted very few researchers. Therefore, little published research is available on the subject. Much effort has been put into the task of generating patterns from log file. These patterns are an important prerequisites for statistical analysis. Patterns could also be used to identify transactions for use in Markov models. None of the existing pattern mining algorithm for system logs produce satisfactory results. To solve the task at hand, a new method for mining patterns is developed. Several different approaches were tested. An approach based on inserting log lines into a tree structure turned out to be a very promising. It outputs good quality patterns and its resource use is moderate. Log analysis without prior knowledge of the system at hand have been proven difficult. This thesis shows that methods where some basic knowl- edge of systems in general is exploited, are the most promising ones. Other approaches based on Markov models and neural networks are suggested in this thesis, but they have not been tested to full extend and require some more work before being useful.
8
Bevan, Jennifer Louise. "Software instability analysis : co-change analysis across configuration-based dependence relationhips /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2006. http://uclibs.org/PID/11984.
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9
Ikeda, Toshihiro, and toshi ikeda@gmail com. "Aerodynamic Analysis of a Blended-Wing-Body Aircraft Configuration." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070122.163030.
Повний текст джерелаАнотація:
In recent years unconventional aircraft configurations, such as Blended-Wing-Body (BWB) aircraft, are being investigated and researched with the aim to develop more efficient aircraft configurations, in particular for very large transport aircraft that are more efficient and environmentally-friendly. The BWB configuration designates an alternative aircraft configuration where the wing and fuselage are integrated which results essentially in a hybrid flying wing shape. The first example of a BWB design was researched at the Loughead Company in the United States of America in 1917. The Junkers G. 38, the largest land plane in the world at the time, was produced in 1929 for Luft Hansa (present day; Lufthansa). Since 1939 Northrop Aircraft Inc. (USA), currently Northrop Grumman Corporation and the Horten brothers (Germany) investigated and developed BWB aircraft for military purposes. At present, the major aircraft industries and several universities has been researching the BWB concept aircraft for civil and military activities, although the BWB design concept has not been adapted for civil transport yet. The B-2 Spirit, (produced by the Northrop Corporation) has been used in military service since the late 1980s. The BWB design seems to show greater potential for very large passenger transport aircraft. A NASA BWB research team found an 800 passenger BWB concept consumed 27 percent less fuel per passenger per flight operation than an equivalent conventional configuration (Leiebeck 2005). The purpose of this research is to assess the aerodynamic efficiency of a BWB aircraft with respect to a conventional configuration, and to identify design issues that determine the effectiveness of BWB performance as a function of aircraft payload capacity. The approach was undertaken to develop a new conceptual design of a BWB aircraft using Computational Aided Design (CAD) tools and Computational Fluid Dynamics (CFD) software. An existing high-capacity aircraft, the Airbus A380 Contents RMIT University, Australia was modelled, and its aerodynamic characteristics assessed using CFD to enable comparison with the BWB design. The BWB design had to be compatible with airports that took conventional aircraft, meaning a wingspan of not more than 80 meters for what the International Civil Aviation Organisation (ICAO) regulation calls class 7 airports (Amano 2001). From the literature review, five contentions were addressed; i. Is a BWB aircraft design more aerodynamically efficient than a conventional aircraft configuration? ii. How does the BWB compare overall with a conventional design configuration? iii. What is the trade-off between conventional designs and a BWB arrangement? iv. What mission requirements, such as payload and endurance, will a BWB design concept become attractive for? v. What are the practical issues associated with the BWB design that need to be addressed? In an aircraft multidisciplinary design environment, there are two major branches of engineering science; CFD analysis and structural analysis; which is required to commence producing an aircraft. In this research, conceptual BWB designs and CFD simulations were iterated to evaluate the aerodynamic performance of an optimal BWB design, and a theoretical calculation of structural analysis was done based on the CFD results. The following hypothesis was prompted; A BWB configuration has superior in flight performance due to a higher Lift-to-Drag (L/D) ratio, and could improve upon existing conventional aircraft, in the areas of noise emission, fuel consumption and Direct Operation Cost (DOC) on service. However, a BWB configuration needs to employ a new structural system for passenger safety procedures, such as passenger ingress/egress. The research confirmed that the BWB configuration achieves higher aerodynamic performance with an achievement of the current airport compatibility issue. The beneficial results of the BWB design were that the parasite drag was decreased and the spanwise body as a whole can generate lift. In a BWB design environment, several advanced computational techniques were required to compute a CFD simulation with the CAD model using pre-processing and CFD software.
10
Jansen, Marloes Eline. "Spatial configuration in rubberhand illusion research : A meta-analysis." Thesis, Högskolan i Skövde, Institutionen för biovetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-20621.
Повний текст джерелаАнотація:
In the rubber hand illusion (RHI), a rubber hand is placed in front of the participant with the participant's hand out of sight. If both hands are touched simultaneously, the illusion typically occurs. Between RHI studies, differences can be seen in the setup, and results of the illusion strength are inconsistent. One of these differences can be the moving RHI, where the real and rubber hand make the same movements to induce the illusion. The differences led to uncertainty regarding the influence of spatial configuration (i.e., an arrangement of the setup within three-dimensional space) on the illusion of body ownership. With this meta-analysis, I quantify the illusion strength in the moving RHI to be able to conclude if spatial configuration influences the results. A total of nine studies were included that had a total of 391 participants. The results show that the synchronous condition has a stronger illusory effect than the asynchronous condition. However, due to heterogeneity, the sample size may not represent the general population. Sub-group analysis showed no major difference in the illusion strength between a vertical and horizontal setup. These observations do not correspond with classical RHI studies in which vertical and horizontal setups were compared. However, in this meta-analysis, only moving RHI studies were included. In the moving RHI, the experimenter does not enter the visual receptive field of the participant, which may explain why no differences between the setups were found. The results of this meta-analysis cannot be seen as definitive; more research is necessary.
11
Alinaghian, Leila Sadat. "Operationalising dynamic capabilities : a supply network configuration approach." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708789.
Повний текст джерела
12
NARAYANAN, VIJAY. "STRUCTURAL ANALYSIS OF REINFORCED SHELL WING MODEL FOR JOINED-WING CONFIGURATION." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1116214221.
Повний текст джерела
13
Knudson, Ole. "Transportability analysis of the M119 Howitzer in the firing configuration." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA277209.
Повний текст джерелаАнотація:
Thesis (M.S. in Mechanical Engineering) Naval Postgraduate School, September 1993.Thesis advisor(s): Healey, Anthony J. "September 1993." Includes bibliographical references. Also available online.
14
Black, Bruce J. "Modeling organizational configuration and decision processes for information warfare analysis." Thesis, Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/8694.
Повний текст джерелаАнотація:
Approved for public release; distribution is unlimitedFor an organization to survive it must be able to adapt to its environment. A military organization operates in an environment that is constantly changing. The ability to model organizational configurations and organizational decision processes can assist the commander in adapting to the environment and understanding how a military organization is susceptible to Information Warfare (1W) attacks. First a commander must understand the concepts of Information Warfare, Command and Control and the concept of organizational decision processes and how these permit an organization to adapt to its environment. Then the commander must determine what level of detail is necessary to model the organizational decision processes for its environment. Next the commander must analyze his model for configuration and decision processes. Using such commercially available software as Organizational Consultant and vDT the commander can identify any organizational misfits to the environment and the 1W attack susceptibilities of the organizational decision processes. In the end, this approach demonstrates that it is feasible to model organizational configuration and organizational decision processes in an Information Warfare environment
15
Wee, Hong Chuan. "Aerodynamic analysis of a canard missile configuration using ANSYS-CFX." Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/10707.
Повний текст джерелаАнотація:
Approved for public release, distribution unlimited--Cover.This study used the Computational Fluid Dynamics code, ANSYS-CFX to predict the static aerodynamic characteristics of a canard-wing missile configuration with a hemispherical nose, triangular wedge canards and fixed trapezoidal wings. The study was conducted for Mach numbers of 0.2, 0.8 and 1.2. The results were compared against experimental data from actual wind tunnel tests and data from a semi-empirical method, AP09. The ANSYS-CFX results showed good agreement for CN, CM, and CL but less agreement for CA when compared to the experimental results. The AP09 results also showed good agreement for CN, CM, and CL but also showed less agreement for CA.
16
Allahverdiyev, Rovshan. "Effects of beam configuration on dynamic properties and seismic performances of multi-storey frame building models." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Знайти повний текст джерелаАнотація:
The present study aims at comparing the dynamic properties and seismic performances offered by reinforced concrete frame structures characterised by different beams distribution.
Multi-storey regular frame buildings are considered as reference structures. Different models are then developed according to various layout of the beams (x-direction is the longitudinal direction, whilst y-direction is the transversal one): (1) beams placed along the x-direction at the odd storeys and placed along the y-direction at the even storeys; (2) beams placed along the y-direction at the odd storeys and placed along the x-direction at the even storeys; (3) and (4) alternating beams every two storeys; (5) beams placed along the x-direction at all storeys; (6) beams placed along the y-direction at all storeys; (7) complete three-dimensional frame with beams placed along both the x- and the y-direction at all storeys. In all models, smaller perimeter beams are placed along the direction orthogonal to the one of the main beams.
Modal analysis has been conducted to evaluate the influence of beams distribution on the period of vibration. Response spectrum and time-history dynamic analyses have been carried out to assess the effects of beams distribution on the base shear and base bending moments, top-storey displacements, interstorey displacements and floor accelerations.
On the contrary of what could be expected, the results indicate that structures with beams alternating every storey do not behave unfavorably with respect to the complete three-dimensional frames. In more detail, two effects may be clearly recognized: one associated to the period and one associated to the static scheme. The former acting basically on the base shear; the latter acting mainly on the base bending moment. The understanding of the influence of beams distribution on frame structures is useful when dealing with seismic vulnerability assessment of existing buildings and design of new buildings.
17
Guan, Junfei. "Simultaneous optimization of transit line configuration and passenger line assignment /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20GUAN.
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18
Santos, Sara Cristina Pereira Guedes Ribeiro. "Separação preparativa e caracterização espectroscópica dos principais monómeros da suberina da cortiça." Doctoral thesis, ISA, 2013. http://hdl.handle.net/10400.5/6157.
Повний текст джерелаАнотація:
Doutoramento em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de AgronomiaSuberin is a vital biomacromolecule responsible for the protection of plants, and yet its molecular structure remains mostly unknown. Cork is the ideal material for suberin extraction because of its suberin content (≥40%) and availability in industrial quantities. Suberin is a polyester made of glycerol and long-chain α,ω-bifunctional fatty acids, mainly C18 ω-hydroxyacids and α,ω-diacids with mid-chain substituents, either an unsaturation, an epoxide or a vic-diol group. The objective of this work was twofold: to develop techniques to isolate the main suberin acids from cork in preparative quantities and high purity (≥99.5%); and to develop spectroscopic techniques, namely NMR-based, to unambiguously assign the stereochemical configuration of the C18 suberin acids. The multi-step process developed comprised suberin depolymerization and suberin acids separation in solvents of contrasting polarities and tempera-tures, followed by successive purification by normal-phase LC and reversed-phase HPLC. The C18:1 suberin acids were proved to be cis, through the analysis of their olefinic and allylic proton and carbon chemical shifts, and coupling constants extracted by spectra simulation. A NMR technique was developed using the chemical shifts of the benzylidene acetal derivatives of vic-diols, proving that the suberin acids C18 9,10-epoxyacids were cis, and the C18 9,10-diol acids were threo, in both cases present as racemic mixtures. The stereochemistry of these acids will be determinant to understand the macromolecular structure of suberin, and the techniques developed for their preparative isolation can be the basis for their industrial commercialization.
19
Wong, Eric Gregory Wen Wie. "Validating network security policies via static analysis of router ACL configuration." Thesis, Monterey, Calif. : Naval Postgraduate School, 2006. http://bosun.nps.edu/uhtbin/hyperion.exe/06Dec%5FWong.pdf.
Повний текст джерелаАнотація:
Thesis (M.S. in Computer Science)--Naval Postgraduate School, December 2006.Thesis Advisor(s) Geoffrey Xie. "December 2006." Includes bibliographical references (p. 149-150). Also available in print.
20
Garcia, Jose Mauro de Figueiredo. "A methodology for the comparative analysis of airport passenger terminal configuration." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/31872.
Повний текст джерелаАнотація:
The right choice between possible types of passenger terminal buildings is the key to a successful airport design project. Historically, in the earlier days of aviation the designer's concern was directed to aircraft and to the adequacy of the ground facilities which each airport provided. As the aviation grew, airport passenger buildings grew more complex and more expensive, to the point of being viewed as a key to the airport's economic performance. In this context, the process of selecting a terminal concept became fundamental for planning and designing airport terminal buildings. However, almost no methodology is available at the initial planning level for the selection of terminal concepts, and very little research has been done in this area.
21
McManus, Stephen C. "Predicting host level reachability via static analysis of routing protocol configuration." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Sep%5FMcManus.pdf.
Повний текст джерелаАнотація:
Thesis (M.S. in Computer Science)--Naval Postgraduate School, September 2007.Thesis Advisor(s): Xie, Geoffrey. "September 2007." Description based on title screen as viewed on October 24, 2007. Includes bibliographical references (p. 149). Also available in print.
22
Sans, Aguilar Juan R. "Four dimensional analysis of free electron lasers in the amplifier configuration." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Dec%5FSans%5FAguilar.pdf.
Повний текст джерелаАнотація:
Thesis (M.S. in Applied Science)--Naval Postgraduate School, December 2007.Thesis Advisor(s): Colson, William B. "December 2007." Description based on title screen as viewed on January 18, 2008. Includes bibliographical references (p. 63). Also available in print.
23
Saur, Martin, and Lena Nikolaisen. "DESIGN AND IMPLEMENTATION OF ELECTRICAL LOAD ANALYSIS FOR CROSS FLEET CONFIGURATION." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-29814.
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Arbia, Giuseppe. "Spatial data configuration in statistical analysis of regional economic and related problems." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330149.
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25
Dong, Zhen [Verfasser], and Artur [Akademischer Betreuer] Andrzejak. "Diagnosing Software Configuration Errors via Static Analysis / Zhen Dong ; Betreuer: Artur Andrzejak." Heidelberg : Universitätsbibliothek Heidelberg, 2017. http://d-nb.info/1180739493/34.
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26
Huang, Haidong. "Optimal design of a flying-wing aircraft inner wing structure configuration." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7439.
Повний текст джерелаАнотація:
Flying-wing aircraft are considered to have great advantages and potentials in
aerodynamic performance and weight saving. However, they also have many
challenges in design. One of the biggest challenges is the structural design of
the inner wing (fuselage). Unlike the conventional fuselage of a tube
configuration, the flying-wing aircraft inner wing cross section is limited to a
noncircular shape, which is not structurally efficient to resist the internal
pressure load. In order to solve this problem, a number of configurations have
been proposed by other designers such as Multi Bubble Fuselage (MBF),
Vaulted Ribbed Shell (VLRS), Flat Ribbed Shell (FRS), Vaulted Shell
Honeycomb Core (VLHC), Flat Sandwich Shell Honeycomb Core (FLHC), Y
Braced Box Fuselage and the modified fuselage designed with Y brace
replaced by vaulted shell configurations. However all these configurations still
inevitably have structural weight penalty compared with optimal tube fuselage
layout. This current study intends to focus on finding an optimal configuration
with minimum structural weight penalty for a flying-wing concept in a preliminary
design stage.
A new possible inner wing configuration, in terms of aerodynamic shape and
structural layout, was proposed by the author, and it might be referred as
‘Wave-Section Configuration’. The methodologies of how to obtain a structurally
efficient curvature of the shape, as well as how to conduct the initial sizing were
incorporated.
A theoretical analysis of load transmission indicated that the Wave-Section
Configuration is feasible, and this was further proved as being practical by FE
analysis. Moreover, initial FE analysis and comparison of the Wave-Section
Configuration with two other typical configurations, Multi Bubble Fuselage and
Conventional Wing, suggested that the Wave-Section Configuration is an
optimal design in terms of weight saving. However, due to limitations of the
author’s research area, influences on aerodynamic performances have not yet
been taken into account.
27
Motta, Teixeira Leopoldo. "Verification and refactoring of configuration knowledge for software product lines." Universidade Federal de Pernambuco, 2010. https://repositorio.ufpe.br/handle/123456789/2323.
Повний текст джерелаАнотація:
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Previous issue date: 2010Conselho Nacional de Desenvolvimento Científico e Tecnológico
Uma linha de produtos de software (LPS) é definida como um conjunto de sistemas de software que compartilham características em comum, mas que são suficientemente distintos entre si, desenvolvidos a partir de um conjunto de artefatos reusáveis. Modelos de features e configuração são usados para possibilitar a geração automática de produtos a partir destes artefatos. Um modelo de features representa o conjunto de possíveis configurações de produto de uma LPS, enquanto o modelo de configuração estabelece o mapeamento entre features e implementação. Por exemplo, associando expressões de features, na forma de proposições lógicas, a artefatos. Os benefícios de produtividade que a abordagem de LPS fornece tornam possível que uma LPS seja capaz de gerar milhares de produtos. Neste contexto, erros cometidos ao especificar o modelo de configuração podem resultar em produtos inválidos - o problema da composição segura. Este problema pode ser difícil de ser detectado manualmente, já que os modelos de features e configuração podem tornar-se muito complexos. Gerar todos os produtos de uma LPS pode não ser prático, dado que existem LPS em que é possível gerar milhares de produtos. No entanto, mesmo modelos de configuração que não permitem a geração de produtos inválidos podem ter problemas na sua estrutura interna, como complexidade e duplicação, especialmente no contexto de LPS grandes, onde sua manutenção pode se tornar difícil. Precisamos nos certificar de que não introduzimos erros ao corrigir estes problemas. Neste trabalho, é proposta uma abordagem automática de verificação de composição segura para LPS baseadas em modelos de configuração. Esta abordagem é baseada na tradução de instâncias específicas de modelos de features e configuração em lógica proposicional, usando uma teoria codificada com Alloy. O suporte ferramental fornecido pelo Alloy Analyzer auxilia a verificação. Também é proposto um catálogo de refatoramentos simples para modelos de configuração, como uma maneira de evitar erros ao corrigir problemas na estrutura interna de tais modelos. Este catálogo é formalizado usando uma teoria geral para modelos de configuração especificada com o Prototype Verification System (PVS). Nós avaliamos a abordagem de verificação usando sete versões de uma LPS, com modelos de features que possibilitam a geração de até 272 produtos. Os resultados demonstram a vantagem de usar esta abordagem ao invés de gerar todos os produtos da LPS, já que o tempo médio para compilar um único produto da LPS é maior que o tempo para analisá-la na maior das versões analisadas. Também avaliamos o catálogo de refatoramento provando consistência (soundness) dos refatoramentos propostos no provador de teoremas de PVS
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Austin, Robert. "The effect of the fastener of different configuration composite panels on failure analysis." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/63.
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This study presents the effect of the stacking sequence and fiber orientation on a composite sandwich panel subjected to static in-plane bolt loading. Six plates were constructed with laminates of unidirectional carbon fiber and cross ply weaves of fiberglass. The orientations that were examined included 0, +/- 45, and 90 degrees. Half of the plates had fiberglass lamina on the outside of the laminate while the other three plates had the carbon fiber on the outside. Experimental and analytical tests were performed to determine the best orientations and stacking sequence.
For the numerical analysis, plates with fibers oriented at +/- 45 degrees showed the highest strength. The experimental data also showed high strengths for the +/- 45 degree plates. However the experimental data also showed high strengths for the 90 degree laminate but with very high displacements. These high displacements would not allow the joint to maintain its relative position to the adjacent part. The discrepancy between the strength of the FEA models and the experimental data is attributed to inaccurate strength properties. The effect of in situ strength and compression strength was found to have a significant effect on the accuracy of the FEA solution. Good correlation was found between the FEA and experimental data in predicting the trend of the stiffness of the plates.
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Dong, Ming. "Process Modeling, Performance Analysis and Configuration Simulation in Integrated Supply Chain Network Design." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/28779.
Повний текст джерелаАнотація:
Supply chain management has been recently introduced to address the integration of organizational functions ranging from the ordering and receipt of raw materials throughout the manufacturing processes, to the distribution and delivery of products to the customer. Its application demonstrates that this idea enables organizations to achieve higher quality products, better customer service, and lower inventory cost.
In order to achieve high performance, supply chain functions must operate in an integrated and coordinated manner. Several challenging problems associated with integrated supply chain design are: (1) how to model and coordinate the supply chain business processes, specifically in the area of supply chain workflows; (2) how to analyze the performance of an integrated supply chain network so that optimization techniques can be employed to improve customer service and reduce inventory cost; and (3) how to evaluate dynamic supply chain networks and obtain a comprehensive understanding of decision-making issues related to supply network configurations. These problems are most representative in the supply chain theory's research and applications.
There are three major objectives for this research. The first objective is to develop viable modeling methodologies and analyzing algorithms for supply chain business processes so that the logic properties of supply chain process models can be analyzed and verified. This problem has not been studied in integrated supply chain literature to date. To facilitate the modeling and verification analysis of supply chain workflows, an object-oriented Petri nets based modular modeling and analyzing approach is presented. The proposed, structured, process-modeling algorithm provides an effective way to design structured supply chain business processes.
The second objective is to develop a network of inventory-queue models for the performance analysis and optimization of an integrated supply network with inventory control at all sites. An inventory-queue is a queueing model that incorporates an inventory replenishment policy for the output store. This dissertation extends the previous work done on the supply network model with base-stock control and service requirements. Instead of one-for-one base stock policy, batch-ordering policy and lot-sizing problems are considered. To determine the replenishment lead times of items at the stores, a fixed-batch target-level production authorization mechanism is employed to explicitly obtain performance measures of the supply chain queueing model. The validity of the proposed model is illustrated by comparing the results from the analytical performance evaluation model and those obtained from the simulation study.
The third objective is to develop simulation models for understanding decision-making issues of the supply chain network configuration in an integrated environment. Simulation studies investigate multi-echelon distribution systems with installation stock reorder policy and echelon stock reorder policy. The results show that, depending on the structure of multi-echelon distribution systems, either echelon stock or installation stock policy may be advantageous. This dissertation presents a new transshipment policy, called "alternate transshipment policy," to improve supply chain performance. In an integrated supply chain network that considers both the distribution function and the manufacturing function, the impacts of component commonality on network performance are also evaluated. The results of analysis-of-variance and Tukey's tests reveal that there is a significant difference in performance measures, such as delivery time and order fill rates, when comparing an integrated supply chain with higher component commonality to an integrated supply chain with lower component commonality.
Several supply chain network examples are employed to substantiate the effectiveness of the proposed methodologies and algorithms.Ph. D.
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Harris, Chester A. "Distributed computing configuration: A combined user, software, and hardware model and analysis methodology /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487946103568637.
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Lee, Jim Pak-Yee Carleton University Dissertation Engineering Electrical. "Acoustooptic fourier transforming configuration for spectrum analysis and determination of direction-of-arrival." Ottawa, 1986.
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Shim, Young Hak. "Design of a cluster analysis heuristic for the configuration and capacity management of manufacturing cells." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/5905.
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This dissertation presents the configuration and capacity management of manufacturing cells using cluster analysis. A heuristic based on cluster analysis is developed to solve cell formation in cellular manufacturing systems (CMS). The clustering heuristic is applied for cell formation considering processing requirement (CFOPR) as well as various manufacturing factors (CFVMF). The proposed clustering heuristic is developed by employing a new solving structure incorporating hierarchical and non-hierarchical clustering methods. A new similarity measure is constructed by modifying the Jarccard similarity and a new assignment algorithm is proposed by employing the new pairwise exchange method. In CFOPR, the clustering heuristic is modified by adding a feedback step and more exact allocation rules. Grouping efficacy is employed as a measure to evaluate solutions obtained from the heuristic. The clustering heuristic for CFOPR was evaluated on 23 test problems taken from the literature in order to compare with other approaches and produced the best solution in 18 out of 23 and the second best in the remaining problems. These solutions were obtained in a considerably short time and even the largest test problem was solved in around one and a half seconds. In CFVMF, the machine capacity was first ensured, and then manufacturing cells were configured to minimize intercellular movements. In order to ensure the machine capacity, the duplication of machines and the split of operations are allowed and operations are assigned into duplicated machines by the largest-first rule. The clustering heuristic for CFVMF proposes a new similarity measure incorporating processing requirement, material flow and machine workload and a new machine-part matrix representing material flow and processing time assigned to multiple identical machines. Also, setup time, which has not been clearly addressed in existing research, is discussed in the solving procedure. The clustering heuristic for CFVMF employs two evaluation measures such as the number of intercellular movements and grouping efficacy. In two test problems taken from the literature, the heuristic for CFVMF produced the same results, but the trade-off problem between the two evaluation measures is proposed to consider the goodness of grouping.
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Müller, Michael. "Retrieval and Analysis of Software Systems from SCM Repositories." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-1603.
Повний текст джерелаАнотація:
One source of input data for software evolution research is data stored inside a software configuration management repository. The data includes different versions of a software system’s source code as well as version history metadata, such as check-in dates or log messages. Inherently, extracting this data manually is a time- and labor intensive task. The subsequent preprocessing step and the appropriate storage of the results, necessary to utilize the data for further analysis, is an additional effort for the researcher.
The goal of this thesis is to design and implement a front-end plug-in for an existing software comprehension tool, the VizzAnalyzer, providing the capability to extract and analyze multiple versions and evolutional information of software systems from SCM repositories and to store the results. Thereby, the implemented solution provides the infrastructure for software evolution research.
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SIVAJI, RANGARAJAN. "AERODYNAMIC ANALYSIS OF THE JOINED-WING CONFIGURATION OF A HIGH-ALTITUDE, LONG ENDURANCE (HALE) AIRCRAFT." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1083849791.
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Andersson, Elin, and Johanna Linda Nugin. "Configuration of an electronic Kanban board for planning analysis activities at an industrial laboratory." Thesis, KTH, Industriell produktion, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278077.
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To improve productivity, it is important that the right product is produced in the right quantity when that product is needed. Kanban is a way to signalise the need for material and its main aspect is that it pulls materials through the processes only when needed. Kanban can therefore help reduce Work In Progress (WIP). Quality Control (QC) at AstraZeneca in Södertälje is tasked with controlling the quality of batch samples from production. Several different analyses need to be performed on a batch and all the analyses should preferably be done at the same time to reduce the levels of ongoing work. The currently used system and working procedures for planning analysis activities at the QC laboratories results in high levels of WIP. The aim of this project was to investigate the possibility to replace the currently used planning system with an electronic Kanban board so that WIP can be limited and a more predictable flow achieved. Observations and discussions have been conducted to understand the current state of the QC process. A literature review has been conducted to form a theoretical framework for concepts such as Just-In-Time and Kanban. A Kanban board has been configured using a software suggested by AstraZeneca for one team. The functionality of the board is presented along with a discussion of how it can be used in their operations. It has been configured so it is possible to prioritise the completion of ongoing batch analyses before new batches are started, making it possible to reduce WIP and achieve a more predictable flow. Tasks are to be prioritised according to a decision tree. Limitations in the construction of the board and challenges with a potential future implementation are discussed. The board has been presented to team leaders and analysts to gain their input. Based on this, some alterations have been suggested. A suggestion for the setup of a pilot test is presented. It is recommended that the board is tested in parallel with the current planning system to evaluate the possibility to implement the board in a larger scale and to further investigate challenges and possibilities with the software.För att förbättra produktiviteten är det viktigt att rätt produkt produceras i rätt mängd när den behövs. Kanban är ett sätt att signalera behov av material och dess huvudaspekt är att material dras genom processen endast när det behövs. Kanban kan därför minska pågående arbete (WIP). Quality Control (QC) på AstraZeneca i Södertälje har som uppgift att kontrollera kvaliteten på batchprover från produktion. Flera olika analyser måste genomföras på en batch och alla analyser ska helst slutföras samtidigt för att reducera nivåerna av pågående arbete. Det nuvarande systemet och arbetsrutiner för att planera analysaktiviteter på QC laboratorierna resulterar i höga nivåer av WIP. Syftet med detta projekt var att undersöka möjligheten att ersätta det nuvarande planeringssystemet med en elektronisk Kanbantavla så att nivåerna av WIP kan begränsas och ett mer förutsägbart flöde uppnås. Observationer och diskussioner har genomförts för att få en förståelse för nuvarande arbetssätt i QC. En litteraturstudie har genomförts för att bilda ett teoretisk ramverk för koncept som Just-In-Time och Kanban. En Kanbantavla har konfigurerats för ett av lagen i en programvara som föreslagits av AstraZeneca. Tavlans funktionalitet presenteras och det diskuteras hur denna kan användas i deras verksamhet. Den har konfigurerats så att det är möjligt att prioritera att analyserna av pågående batcher slutförs innan nya batcher påbörjas, vilket möjliggör en reduktion av WIP och skapandet av ett mer förutsägbart flöde. Ett beslutsträd ska användas som hjälpmedel för att prioritera arbetsuppgifter rätt. Begränsningar i konstruktionen och utmaningar med en potentiell framtida implementation diskuteras. Tavlan har presenterats för team leaders och analytiker för att erhålla deras input. Baserat på denna har också några ändringar föreslagits. Ett förslag på upplägg för en pilottestning presenteras. Det är rekommenderat att tavlan testas parallellt med nuvarande planeringssystem för att utvärdera möjligheten att implementera den i större skala samt för att vidare undersöka utmaningar och möjligheter med programvaran.
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MARISARLA, SOUJANYA. "STRUCTURAL ANALYSIS OF AN EQUIVALENT BOX-WING REPRESENTATION OF SENSORCRAFT JOINED-WING CONFIGURATION FOR HIGH-ALTITUDE, LONG-ENDURANCE (HALE) AIRCRAFT." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1116215297.
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Wiscombe, Samantha Ann. "Family Ties: A Profile of Television Family Configurations, 2004–2013." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4348.
Повний текст джерелаАнотація:
This study provides a content analysis of television families portrayed in family-focused programs aired between 2004 and 2013. The analysis focuses on family configuration type, parent type and marital status, and the frequency and gender of children characters, as well as each program's genre, channel type, and target audience. The study uses cultivation theory as the basis of understanding and aims to anticipate television's potential effects and raise important questions that should be addressed in future studies. Results indicate that the traditional nuclear family configuration held the largest portion of the television family landscape. The study found an increase in single-parent families and a decrease in reconstituted families portrayed on television. Significantly, the content analysis revealed a new family configuration type that had not been identified in previous studies: nuclear with same-sex parents. The study found more single mothers than single fathers and discovered that single mothers had significantly fewer male children, pointing out a potential issue in terms of single-parent gender. The content analysis found more male children than female children; however, four years of data included more females than males, indicating possible movement toward equal representation of both genders. This study calls out the importance of educating young television audiences regarding the increasing complexity of the modern-day television family. The potential cultivation effect of family-related television programming could affect society's views of the importance of family—an issue that should be explored in future research. Other areas for future studies include trends related to television families with same-sex parents and extended family member dynamics as portrayed on television.
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Sivaji, Rangarajan. "Aerodynamic analysis of the joiined-wing configuration of a high-altitude, long-endurance (hale) aircraft." Cincinnati, Ohio : University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin1083849791.
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Zarrouk, Pauline. "Clustering Analysis in Configuration Space and Cosmological Implications of the SDSS-IV eBOSS Quasar Sample." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS297/document.
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Le modèle ΛCDM de la cosmologie repose sur l’existence d’une composante exotique, appelée énergie noire, pour expliquer l’accélération tardive de l’expansion de l’univers à z < 0.7. Des alternatives à cette constante cosmologique proposent de modifier la théorie de la gravitation basée sur la relativité générale aux échelles cosmologiques. Depuis l’automne 2014, le multi-spectrographe SDSS-eBOSS effectue un relevé de quasars dans un domaine en redshift peu exploré entre 0.8 ≤ z ≤ 2.2 dont l’un des objectifs majeurs est d’étendre les contraintes sur la nature de l’énergie noire et de tester la validité de la théorie de la relativité générale à plus haut redshift en utilisant les quasars comme traceurs de la matière.Dans cette thèse, nous mesurons et analysons la fonction de corrélation à deux points de l’échantillon de quasars obtenu après deux ans d'observation de eBOSS pour contraindre les distances cosmiques, à savoir la distance angulaire DA et le taux d'expansion H, ainsi que le taux de croissance des structures fσ8 à un redshift effectif Zeff = 1.52. Nous commençons par construire des catalogues des grandes structures qui prennent en compte la géométrie angulaire et radiale du relevé. Puis pour obtenir des contraintes robustes, nous identifions plusieurs sources d’effets systématiques, en particulier ceux liés à la modélisation et aux observations sont étudiées avec des « mock catalogues » dédiés qui correspondent à des réalisations fictives de l’échantillon de quasars eBOSS. Les paramètres cosmologiques de ces catalogues fictifs étant connus, ils sont utilisés comme référence pour tester notre procédure d’analyse. Les résultats de ce travail sur l’évolution des distances cosmiques sont compatibles avec les prédictions du modèle ΛCDM utilisant les paramètres de Planck et basé sur l’existence d’une constante cosmologique. La mesure du taux de croissance des structures est compatible avec la prédiction de ce modèle basé sur la relativité générale, ce qui étend ainsi la validité de la théorie aux échelles cosmologiques à grand redshift. Nous utilisons également notre mesure pour mettre à jour les contraintes sur les modèles d'extensions à ΛCDM et sur les scénarios de gravité modifiée. Ce travail de thèse constitue une première étude menée avec les données de quasars eBOSS et sera utilisée pour l’analyse de l’échantillon final à la fin 2019 ou l’on attend une amélioration de la précision statistique d’un facteur 2. Associé à BOSS, eBOSS ouvrira la voie pour les futurs programmes d’observation, comme le télescope au sol DESI et le satellite Euclid. Ces deux programmes sonderont intensivement l’époque de l’univers entre 1 < z < 2 en observant plusieurs millions de spectres, ce qui permettra d'améliorer d'un ordre de grandeur au moins les contraintes actuelles sur les paramètres cosmologiquesThe ΛCDM model of cosmology assumes the existence of an exotic component, called dark energy, to explain the late-time acceleration of the expansion of the universe at redshift z < 0.7. Alternative scenarios to this cosmological constant suggest to modify the theory of gravitation based on general relativity at cosmological scales. Since fall 2014, the SDSS-IV eBOSS multi-object spectrograph has undertaken a survey of quasars in the almost unexplored redshift range 0.8 ≤ z ≤ 2.2 with the key science goal to complement the constraints on dark energy and extend the test of general relativity at higher redshifts by using quasars as direct tracers of the matter field.In this thesis work, we measure and analyse the two-point correlation function of the two-year data taking of eBOSS quasar sample to constrain the cosmic distances, i.e. the angular diameter distance DA and the expansion rate H, and the growth rate of structure fσ8 at an effective redshift Zeff = 1.52. First, we build large-scale structure catalogues that account for the angular and radial incompleteness of the survey. Then to obtain robust results, we investigate several potential systematics, in particular modeling and observational systematics are studied using dedicated mock catalogs which are fictional realizations of the data sample. These mocks are created with known cosmological parameters such that they are used as a benchmark to test the analysis pipeline. The results on the evolution of distances are consistent with the predictions for ΛCDM with Planck parameters assuming a cosmological constant. The measurement of the growth of structure is consistent with general relativity and hence extends its validity to higher redshift. We also provide updated constraints on extensions of ΛCDM and models of modified gravity. This study is a first use of eBOSS quasars as tracers of the matter field and will be included in the analysis of the final eBOSS sample at the end of 2019 with an expected improvement on the statistical precision of a factor 2. Together with BOSS, eBOSS will pave the way for future programs such as the ground-based Dark Energy Spectroscopic Instrument (DESI) and the space-based mission Euclid. Both programs will extensively probe the intermediate redshift range 1 < z < 2 with millions of spectra, improving the cosmological constraints by an order of magnitude with respect to current measurements
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Wennbom, Marika. "Impact of error : Implementation and evaluation of a spatial model for analysing landscape configuration." Thesis, Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-79214.
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Quality and error assessment is an essential part of spatial analysis which with the increasingamount of applications resulting from today’s extensive access to spatial data, such as satelliteimagery and computer power is extra important to address. This study evaluates the impact ofinput errors associated with satellite sensor noise for a spatial method aimed at characterisingaspects of landscapes associated with the historical village structure, called the HybridCharacterisation Model (HCM), that was developed as a tool to monitor sub goals of theSwedish Environmental Goal “A varied agricultural landscape”. The method and errorsimulation method employed for generating random errors in the input data, is implemented andautomated as a Python script enabling easy iteration of the procedure. The HCM is evaluatedqualitatively (by visual analysis) and quantitatively comparing kappa index values between theoutputs affected by error. Comparing the result of the qualitative and quantitative evaluationshows that the kappa index is an applicable measurement of quality for the HCM. Thequalitative analysis compares impact of error for two different scales, the village scale and thelandscape scale, and shows that the HCM is performing well on the landscape scale for up to30% error and on the village scale for up to 10% and shows that the impact of error differsdepending on the shape of the analysed feature. The Python script produced in this study couldbe further developed and modified to evaluate the HCM for other aspects of input error, such asclassification errors, although for such studies to be motivated the potential errors associatedwith the model and its parameters must first be further evaluated.
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Van, Mierlo Koen. "Computational analysis of the flow field and noise radiation of a generic main landing gear configuration." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/388076/.
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This study investigates the flow field and acoustics of a generic four wheel main landing gear. The landing gear is an important airframe noise source during the approach phase. The characteristics of the flow field around the bogie area of the main landing gear are largely unknown. CFD simulations using the DES turbulence model have been used to calculate the unsteady flow field around a generic landing gear model. The surface pressure data has been sampled and used in a FW-H solver to determine far field noise levels. Two different landing gear models have been used, a simplified geometry and a more realistic complex geometry. Three different bogie angles have been simulated: horizontal bogie aligned with the flow, 10⁰ toe up and 10⁰ toe down. Strong streamwise vortices are generated at the front wheels of the landing gear. The trajectory of these vortices determines where the turbulent flow interacts with the downstream components. This interaction leads to surface pressure fluctuations which are a major noise source. The flow field of the simplified configurations shows a consistent trend of the trajectory of the streamwise vortices with respect to changes in bogie angle. The far field noise levels generated by the different components of the simplified configurations are related to the distance at which the streamwise vortices pass. The additional components of the complex landing gear geometry change the characteristics of the flow field. The strong streamwise vortices persist but they do not show the same trend as for the simplified configurations. The wake of the articulation link generates a turbulent in flow for the other components. The different characteristics of the flow field of the complex configurations lead to significant changes in the far field noise levels of the components compared to the simplified configurations.
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Smith, Paige Elizabeth. "Tools to Improve the Process of Engineering Design: An Analysis of Team Configuration and Project Support." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/26677.
Повний текст джерелаАнотація:
The purpose of this research was to determine how team design and project management (planning and tracking) affected planning and design performance and the people involved in the process. A laboratory study was conducted to evaluate three factors: team design (individuals versus groups of three), project support (no project support versus manual project support versus automated project support), and the engineering design life-cycle, which includes conceptual design, preliminary design, and detailed design. There were six observations per treatment, involving a total of 72 undergraduate engineering students. The impact of these factors were evaluated for planning time, design cycle time, cost effectiveness, cost variance, schedule variance, mental workload, and job satisfaction. For treatments that called for groups, group process was evaluated in addition to group workload. The results showed groups took 61% more time to plan their projects compared to individuals (p<0.01). Planning time was 31% longer for participants with manual support compared to those with automated project support (p<0.01). Schedule variance (p<0.01) and cost variance (p<0.001) decreased 24% and 23%, respectively, over time during the design process. The design cycle time was 17% longer for participants without project support compared to those with automated project support (p<0.05). During design, groups and individuals allocated their time differently (p<0.05). Mental workload, measured with the NASA Task Load Index (TLX), showed workload increased 16% over time (p<0.001). In addition, the combination of design phase and project tracking support affected the TLX (p<0.01). Job satisfaction was 5% lower at the end of the design project compared to the beginning of design (p<0.05). From the analysis on group process, the type of project support affected the group process during planning. Groups with manual support interacted 83% more than those with automated support (effective behaviors: p<0.01; ineffective behaviors: p<0.05). During design, the roles individuals played within the group affected how much they contributed to the groupâ s process (effective behaviors: p<0.0001; ineffective behaviors: p<0.01).
There were several practical implications that can be drawn from this study. In the decision to use teams versus groups, there was evidence that groups were able to attend to more of the design requirements than individuals, which resulted in the design of systems with higher reliability. However the tradeoff of using groups were in the labor cost and in longer planning and status report meetings. Therefore the organizationâ s goals need to be carefully considered before selecting the team design. For project support, there were clear benefits to automating the planning process. Automation resulted in better Gantt chart and planning sessions that were completed more quickly compared to those with manual support. Furthermore, systems designed with automated support resulted in lower design costs compared to systems designed without project support.Ph. D.
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Yang, Yi-Chen, and 楊義成. "Mechanism Configuration Synthesis and Machining Analysis." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/99089271632265774362.
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博士國立成功大學
機械工程學系
88
The purpose of this paper is to investigate the characteristics of wire-cut electric discharge machines in all respects, including: mechanism configuration synthesis, machining error analysis and algorithm for CAD/CAM system. Firstly, the mechanism configuration synthesis for wire-cut EDM machine is proposed. The mechanism tree-graph representations are introduced to conclude the topology and motion characteristics of wire-cut EDM. The design requirements are studied and the structure configurations are synthesized. The design process starts by investigating existing mechanisms and concludes their topology and motion characteristics. The second step is to describe the topology structures of existing mechanisms. The third step is to transform these mechanisms into their corresponding generalized tree graphs. The fourth step is to obtain all possible tree graph. The fifth step is to assign certain type of links and joints. Finally, the atlas mechanisms are obtained. As the result, for the wire-cut EDM machine, the number of possible configurations is 248. Secondly, using the Denavit-Hartenburg matrix to describe the motion of the wire and to generate the function of the ruled surface. Then, applied the error of each link and joint to analysis the error matrix of each link. Finally, using the differential method to calculate the machining error. Two examples are shown to compare the current mechanism and new mechanism synthesized from chapter 3. Finally, this paper proposes a CAD/CAM mathematical foundation to design ruled surfaces for wire-cut EDM. This method combines the boundary plane concept, the Plucker coordinate representation of lines, control lines and design function to generate free form ruled surfaces. The tool motion and offset surface can also be generated simply by the same approach for computer numerical control (CNC) wire-cut EDM. The algorithm, being different from conventional methods, can present a surface or tool path concisely and uniquely.
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Wu, Tzu-wei, and 吳子偉. "The Configuration Analysis of Interferometric Hydrophones." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/04954299911558010991.
Повний текст джерелаАнотація:
碩士國立中山大學
通訊工程研究所
92
The interferometeric optical fiber sensor has high sensitivity for sound signal. This characteristic is used to design hydrophones. The sound pressure causes the optical fiber to change its shape. So as to induce phase difference between sensing and reference arms. Using the demodulation system, we can get the signal we want. In this thesis, we plan to analyze three different kinds of optic configurations, such as Michelson, compensating Mach-Zehnder, hybrid configuration of Mach-Zehnder and Sagnac interferometers. The mathematical methods are used to compare their characters. We also use software to simulate the relation among sensitivity, delay fiber and frequency character of the Sagnac interferometer. In our experiment, we use PGC modulation technology and compare the results with a standard hydrophone B&K 8103 for calibration. We also measure the dynamic range of proposed three interferometers. The measurement result of this paper is as following: Michelson and compensating type Mach-Zehnder interferometer dynamic range were about 24.90 dB and 13.98 dB, the acoustic signal sensitivity was -201.67 dB re V/1uPa and -205.97 dB re V/Pa, respectively. The dynamic range of the hybrid of Mach-Zehnder and Sagnac type interferometer was 33.67 dB and acoustic signal sensitivity was -212.47 dB re V/1uPa.
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Te, Chen Tzung, and 陳宗德. "Analysis of Assembly through Product Configuration." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/82267171012512992928.
Повний текст джерелаАнотація:
碩士國立中山大學
機械工程研究所
86
Product configuration is the standard information of the product thatdescribes its composition, structure, and their relationships. These datashows what the product is and how it is built including its structure,components, geometric information, and assembly relationships, etc. Configuration management is a product data management facility in a productdatabase management system that manages product data and related components''data to build up its configuraton. It allows designer to develop a productmore easy and effective. During the product design and development stages,designer can acquire complete related product and components data with CMsupport. Product configuration process is one of the applying processes in CMthat helps designer establish his/her design with combining differentcomponents'' data. The selected components will be connected and furtherchecking the feasibility of their assembability before they are assembled inreal world. The assembly verification provides such function in CM. However,for doing this task, the assembly rules and constraints should be establishedat first in order to verify the assembly relations between related parts.Assembly model is a common approach to represent the assembly relations in aproduct that can be analyzed to generated assembly rules and constraints. Forusing it to analyze assembly relations, it should be able to represent thegeneric design of aproduct. In this thesis, we suggest a modeling procedurefor building such an assembly model and we also make discussion how to makeanalysis of the assembly relations in it. At last, the configuration of thepersonal computer will be taken as an example to show how this procedure worksand how the assembly rules and constraints for computer assembly are derived.
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Singh, Nieraj. "Integrated tooling framework for software configuration analysis." Thesis, 2011. http://hdl.handle.net/1828/3281.
Повний текст джерелаАнотація:
Configurable software systems adapt to changes in hardware and execution environments, and often exhibit a variety of complex maintenance issues. Many tools exist to aid developers in analysing and maintaining large configurable software systems. Some are standalone applications, while a growing number are becoming part of Integrated Development Environments (IDE) like Eclipse. Reusable tooling frameworks can reduce development time for tools that concentrate on software configuration analysis. This thesis presents C-CLEAR, a common, reusable, and extensible tooling framework for software configuration analysis, where clear separation of concern exists between tooling functionality and definitions that characterise a software system. Special emphasis will be placed on common mechanisms for data abstraction and automatic IDE integration independent of the software system that is being analysed.Graduate
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Shih, Ying, and 石穎. "Improving System Security through System Configuration Analysis." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/58247755030704128690.
Повний текст джерелаАнотація:
碩士國立交通大學
資訊科學與工程研究所
101
Configuration is an essential part of any software system and plays a key role in the security of a system. On Windows, the registry stores a large amount of configuration information. There is research about registry which applied it on many applications. Some applied on intrusion detection. Some applied on configuration error detection. We propose a system for examining problems of a Windows system’s configuration, which covers not only the Windows registry but also the file system. The system checks for three kinds of problem: 1) missing updates for Microsoft software, 2) corruption in file system that causes abnormal application behavior, 3) corruption in Windows registry that causes abnormal application behavior. The system consists of three main components. The first is configuration extractor running on the client-side to extract a user system’s configuration. The second is configuration statistics builder which produces a statistics of healthy samples collected. The other is the configuration examiner which examines the target configuration. Statistics builder produces configuration statistics from healthy samples, and examiner examines target configuration with the statistics. The system is evaluated against all three types of problems. On the checking for missing updates for Microsoft software, the system achieves 90% accuracy, and on the checking for corruption in the file system, the system achieves higher than 70% accuracy. For the checking for corruption in Windows registry that causes abnormal application behavior, although the system cannot fix the abnormal behavior of application, the system points out the registry difference between sick machine and the statistics from healthy machines.
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CHANG, CHEN-FENG, and 張振豐. "SCANNING OPTICAL MICROSCOPE CONFIGURATION AND FAILURE ANALYSIS." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/cn8qc3.
Повний текст джерелаАнотація:
碩士中華大學
機械工程學系
106
Failure Analysis (FA) is one of the most important steps in design, manufacture process and packaging for ICs or panels. During the whole fabrication process, lots of failures will have occurred. As a result, failure localization is one of the key points to increase the reliability, product’s yield and product’s quality. Moreover, problem-solving skills and information categorize are also critical techniques for engineers. When a problem or issue occurred, it is important for engineers to quickly analyze it and applied the best solution to solve it. In this thesis, it will include relevant technical information and current popular techniques for Failure analysis. It will also contain three case studies for real on field experience and how to put it into a particle experience and to help others to solve similar problems faster in the future. All these experiences are very important assets for the company and the engineer as this would be able to decrease the system downtime by solving the issue quickly and be able to provide the production and R&D department to improve the system reliability. These knowledge and experience are extremely important assets to the company as it would be able to save a lot of time and effort for repeatable failure on different systems. In conclusion, all these issues can be solved or prevented after the investigation of the failure.
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Kanso, Ali. "Automated Configuration Design and Analysis for Service High-Availability." Thesis, 2012. http://spectrum.library.concordia.ca/974790/9/Kanso_PhD_F2012.pdf.
Повний текст джерелаАнотація:
The need for highly available services is ever increasing in various domains ranging from mission critical systems to transaction based ones such as online banking. The Service Availability Forum (SAForum) has defined a set of services and related Application Programming Interface (API) specifications to address the growing need of commercial-off-the-shelf high availability solutions. Among these services, the Availability Management Framework (AMF) is the service responsible for managing the high availability of the application services. To achieve this task, an AMF implementation requires a specific logical view of the organization of the application’s services and components, known as an AMF configuration. Any AMF configuration must be compliant to the concepts and constraints defined in the AMF specifications. The process of defining AMF configurations is error prone and requires extensive domain knowledge. Another major issue is being able to analyze the designed AMF configuration to quantify the anticipated service availability. This requires a different set of modeling and analysis skills that system integrators might not necessarily possess. In this dissertation we propose the automation of this process. The premise is to define a generation method within which we embed the domain knowledge and the domain constraints, and by that generating AMF configurations that are valid by construction. We also define an approach for the service availability analysis of AMF configurations. Our method is based on generating an analysis stochastic model that captures the middleware behavior and the application configuration. This model is thereafter solved to quantify the service availability.
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"Analysis of configuration singularities of platform-type robotic manipulators." Chinese University of Hong Kong, 1995. http://library.cuhk.edu.hk/record=b5888477.
Повний текст джерелаАнотація:
by Lo, Ka-wah.Thesis (M.Phil.)--Chinese University of Hong Kong, 1995.
Includes bibliographical references (leaves 76-81 (2nd gp.)).
Acknowledgments --- p.i
Abstract --- p.ii
Notations --- p.iii
List of Figures --- p.v
List of Tables --- p.vii
Chapter 1. --- Introduction
Chapter 1.1 --- Motivation --- p.1
Chapter 1.2 --- Literature Review --- p.4
Chapter 1.3 --- Objective --- p.10
Chapter 2. --- Comparison of Different Approaches
Chapter 2.1 --- Sample Manipulator --- p.11
Chapter 2.1.1 --- Force Decomposition Method --- p.12
Chapter 2.1.2 --- Forward Rate Kinematics Base Method --- p.15
Chapter 2.1.3 --- Grassmann Geometry Method --- p.18
Chapter 2.2 --- Comparison Criteria --- p.20
Chapter 2.2.1 --- Computational Complexity --- p.20
Chapter 2.2.2 --- Scope of Application --- p.22
Chapter 2.3 --- Summary --- p.23
Chapter 3. --- Enumeration of Configuration Singularity
Chapter 3.1 --- Novel 6 DOF --- p.25
Chapter 3.1.1 --- Result Analysis --- p.31
Chapter 3.2 --- A 3 DOF with Symmetric Base --- p.33
Chapter 3.2.1 --- Result Analysis --- p.35
Chapter 3.3 --- A 3 DOF with Non-Symmetric Base --- p.36
Chapter 3.3.1 --- Result Analysis --- p.37
Chapter 3.4 --- A New Model of 6-SPS Defined by Kong et al --- p.40
Chapter 3.5 --- A New Class of 6-SPS Platform-Type Parallel Manipulator --- p.45
Chapter 3.5.1 --- The Hexagonal Base --- p.46
Chapter 3.5.2 --- The Pentagonal Base --- p.50
Chapter 3.5.3 --- The Tetragonal Base --- p.52
Chapter 3.5.4 --- The Triangular Base --- p.55
Chapter 3.6 --- Summary --- p.59
Chapter 4. --- Numerical Analysis
Chapter 4.1 --- Parameter Analysis --- p.60
Chapter 4.1.1 --- One Unknown Variable --- p.61
Chapter 4.1.2 --- Two Unknown Variables --- p.63
Chapter 4.2 --- Critical Value of Ratio R/q --- p.69
Chapter 4.3 --- Summary --- p.72
Chapter 5. --- Conclusions and Future Work
Chapter 5.1 --- Conclusions --- p.73
Chapter 5.2 --- Future Work --- p.75
References --- p.76
Appendix --- p.82