Dissertations / Theses: 'Large-System'

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Nedic, Dusko P. "Simulation of large system disturbances." Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488379.

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Hedlund, Daniel. "Motor system design for large UAV." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-36223.

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This thesis investigates the viability of creating a fully electrical motorsystem for a large UAV capa-ble of VTOL. As of today only relatively small UAV's use fully electrical motors as their only sourceof propulsion, larger UAV's have to rely on more traditional combustion or jet engines. The reasonfor this is the low energy density of modern batteries compared to petroleum and diesel, even withhigh eciency standards on electric motors, this means that UAV's relying only on electric motorswill have a very short ight time and thus short operational range. To get around this dierentmethods that aircraft use to achieve VTOL ight was investigated as well as dierent methods forextending the ight time. The resulting UAV will combine the design of normal quadrocopters andmodern sailplanes to create a UAV capable of gliding long distances to increase the range. Severaldierent motors where considered for the motor system and out of these the EMRAX 208 waschosen. For the propeller a size of 68 inch was chosen with a pitch of 28 inch, the specic propellerused for the thesis was two Powern f-blades mounted on an apex hub. Several dierent batterieswhere also considered to poever the motors, the chosen battery is the LE 5000 7S. To control themotors a Gen5-S9 ESC whas chosen, one is needed for each motor. Using these components, theweight of the cargo and an estimated weight of the body the total weight of this UAV is estimatedto be approximately 482 kilograms, the calculated operational range is 11.25 kilometers.

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Johansson, Angela. "Distributed System for Factorisation of Large Numbers." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1883.

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This thesis aims at implementing methods for factorisation of large numbers. Seeing that there is no deterministic algorithm for finding the prime factors of a given number, the task proves rather difficult. Luckily, there have been developed some effective probabilistic methods since the invention of the computer so that it is now possible to factor numbers having about 200 decimal digits. This however consumes a large amount of resources and therefore, virtually all new factorisations are achieved using the combined power of many computers in a distributed system.

The nature of the distributed system can vary. The original goal of the thesis was to develop a client/server system that allows clients to carry out a portion of the overall computations and submit the result to the server.

Methods for factorisation discussed for implementation in the thesis are: the quadratic sieve, the number field sieve and the elliptic curve method. Actually implemented was only a variant of the quadratic sieve: the multiple polynomial quadratic sieve (MPQS).

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Wilson, I. D. "Operating system design for large personal workstations." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372924.

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Rivard, Robin L. "Inherent discipline required in large system change." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/35103.

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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, February 2006.
Includes bibliographical references (p. 90).
Recent electrical architectures of land vehicles have shown a marked increase in networking and integration of electronic controls into traditionally electro-mechanical devices, which results in complex functional interactions throughout the electrical system. This trend often drives a large system change that modifies the engineering roles of the component level engineer and also creates a need for an evolution to a vehicle level systems engineering approach. In this paper, a claim was put forth that without a certain level of inherent discipline in place and functional, no successful large system change can occur. Inherent discipline was decomposed into three parts: process, personal, and organizational disciplines. Each of these was described and relationships between them were investigated. The correlation between parenting and organizational discipline was explored. A case for the business value of inherent discipline was made by examining two examples; one of organizational progress and one of manufacturing progress. Then a case study of an emerging large system change, feature ownership, was presented. Details on the engineering roles required for feature based development at each of the hierarchical levels of the electrical system were presented.
(cont.) Using the Design Structure Matrix as a tool, the interactions of the development process used for implementing distributed features were analyzed. Elements of inherent discipline required for a successful implementation of feature ownership were identified, as well as feedback from engineers in the organization implementing this large system change. The criticality of organizational discipline, in particular, to the feature ownership change initiative was emphasized. Recommended next steps for process, personal, and organizational discipline were detailed and possible effects of lack of discipline on feature ownership were postulated. The three types of discipline form a balance for the large system change initiative. The absence of any of the three can have a detrimental effect on the progress and effectiveness of the change, leading to poor quality, application or implementation of the change.
by Robin L. Rivard.
S.M.

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Mansfield, Peter Ketil. "A large volume close-range photogrammetric system." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/14064.

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Koppe, Jason. "Differential virtualization for large-scale system modeling /." Online version of thesis, 2008. http://hdl.handle.net/1850/7543.

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Chadha, Vikrampal. "Simulation of large-scale system-level models." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-12162009-020334/.

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Aga, Svein. "System Recovery in Large-Scale Distributed Storage Systems." Thesis, Norwegian University of Science and Technology, Department of Computer and Information Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9724.

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This report aims to describe and improve a system recovery process in large-scale storage systems. Inevitable, a recovery process results in the system being loaded with internal replication of data, and will extensively utilize several storage nodes. Such internal load can be categorized and generalized into a maintenance workload class. Obviously, a storage system will have external clients which also introduce load into the system. This can be users altering their data, uploading new content, etc. Load generated by clients can be generalized into a production workload class. When both workload classes are actively present in a system, i.e. the system is recovering while users are simultaneously accessing their data, there will be a competition of system resources between the different workload classes. The storage must ensure Quality of Service (QoS) for each workload class so that both are guaranteed system resources. We have created Dynamic Tree with Observed Metrics (DTOM), an algorithm designed to gracefully throttle resources between multiple different workload classes. DTOM can be used to enforce and ensure QoS for the variety of workloads in a system. Experimental results demonstrate that DTOM outperforms another well-known scheduling algorithm. In addition, we have designed a recovery model which aims to improve handling of critical maintenance workload. Although the model is intentionally intended for system recovery, it can also be applied to many other contexts.

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Verez, Guillaume. "System integration of large scale offshore wind power." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12608.

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Electricity generation, along with motor vehicles, is one of the biggest sources of pollution for the planet. Renewable energies are not able to replace massively polluting power plants but they can at least alleviate for it. Biomass and hydro power are the main source of renewable energy but wind power is developing to high extent, increasing by 30% its installed capacity every year in the world. Norway is increasing its wind power production since every hydro power areas are already used. The shallow Norwegian waters along with the increase of energy demand leads to offshore wind project.The aim of this thesis is to study the integration of large scale offshore wind farms into the grid. The biggest offshore wind farm is currently installed in the United Kingdom (Thanet) and its capacity is 300 MW. The wind farm studied here has a capacity of 1000 MW. HVAC and HVDC transmission are investigated in order to connect the wind farm to Norway. Case faults are performed in order to study the system stability. The connection points are located in the most populated areas of Norway, where there is a real need for new power plants: Sørlandet and Vestlandet.Statnett is the Norwegian transmission system operator and thus the focus was made on the connection with power flow and stability analysis and not on the full description of the wind farm. For simulations, Statnett is mainly using PSS®E (Power System Simulator) from Siemens but as much of the help was providing by SINTEF, the largest independent research organisation in Scandinavia, it was more convenient to use their tool: SIMPOW from STRI AB.

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Kahn, Muzammil Zareen. "A Session-Based System for Aligning Large Ontologies." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-60156.

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Ontologies are a key technology for the Semantic Web. In different areas, a large number of ontologies have been developed so far by different people or organizations under the same domains and many of them contain overlapping information. In order to get more benefit from different ontologies having inter-related knowledge they have to be aligned or merged. A number of systems have been developed for aligning and merging ontologies and various alignment strategies are used in these systems. However, there is no system available which supports multiple alignment sessions for aligning large ontologies adequately. In this thesis work we propose a session-based framework for aligning and merging large ontologies. We have implemented two types of sessions, computation sessions to generate suggestions and validation sessions to validate these generated suggestions. Furthermore after categorizing suggestions into accepted and rejected ones, we generated partial reference alignment (PRA) that can be used to compute similarities between terms and to filter mapping suggestions. We have also proposed recommendation process integrated with computation and validation sessions in order to find out which matchers, and combinations are better to use for alignment process. Either computation and validation sessions may use the recommended settings or the user can select other matchers and combinations.

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Martinovic, Zarko. "Design a PV – system for a large building." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-17539.

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This study presents the complete design of a photovoltaic system in commercial buildings. PV installation for Multiarena was primary used for internal consumption, rest of production will be sent according intentions in grid. Project presents theoretical demand calculations for building consumptions. According to the theoretical calculations numerical study has been provided by software Indoor Climate and Energy program. Detailed electric optimization strategy can be founded in project description, as well as the sizing of the photovoltaic installation and economic and financial issues related to it. Study presents several models for photovoltaic system and their economic analysis. Environmental issues can be founded at the end of the study.

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Lunn, Rebecca Jane. "A nitrogen modelling system for large river basins." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294852.

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Mitchell, David Riach. "Modelling environments for large scale process system problems." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/15408.

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This thesis presents a novel modelling environment for large scale process systems problems. Traditional modelling environments attempt to provide maximal functionality within a fixed modelling language. The intention of such systems is to provide the user with a complete package that requires no further development or coding on their part. This approach limits the user to the functionality provided within the package but requires little or no programming experience on the part of the user. The environment provides sufficient capability for the user to describe the model in terms of a variable set and a set of methods with which to manipulate the variables. Many of these methods will describe equations but there is no restriction limiting methods to representing equations. These methods can act as agents, linking the modelling environment to external systems such as physical property databanks and non-JFMS format models. Separating the description of the model from its' processing allows the complexities to be dealt with in a full programming language (external functions are written in Fortran90 or C). The behaviour of the system is tailored by the user, the modelling environment existing solely to store the model structure and provide the interface layer between the external systems.

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Larsson, Carl-Johan. "Movie Recommendation System Using Large Scale Graph-Processing." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200601.

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Morari, Alessadro. "Scalable system software for high performance large-scale applications." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/144564.

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In the last decades, high-performance large-scale systems have been a fundamental tool for scientific discovery and engineering advances. The sustained growth of supercomputing performance and the concurrent reduction in cost have made this technology available for a large number of scientists and engineers working on many different problems. The design of next-generation supercomputers will include traditional HPC requirements as well as the new requirements to handle data-intensive computations. Data intensive applications will hence play an important role in a variety of fields, and are the current focus of several research trends in HPC. Due to the challenges of scalability and power efficiency, next-generation of supercomputers needs a redesign of the whole software stack. Being at the bottom of the software stack, system software is expected to change drastically to support the upcoming hardware and to meet new application requirements. This PhD thesis addresses the scalability of system software. The thesis start at the Operating System level: first studying general-purpose OS (ex. Linux) and then studying lightweight kernels (ex. CNK). Then, we focus on the runtime system: we implement a runtime system for distributed memory systems that includes many of the system services required by next-generation applications. Finally we focus on hardware features that can be exploited at user-level to improve applications performance, and potentially included into our advanced runtime system. The thesis contributions are the following: Operating System Scalability: We provide an accurate study of the scalability problems of modern Operating Systems for HPC. We design and implement a methodology whereby detailed quantitative information may be obtained for each OS noise event. We validate our approach by comparing it to other well-known standard techniques to analyze OS noise, such FTQ (Fixed Time Quantum). Evaluation of the address translation management for a lightweight kernel: we provide a performance evaluation of different TLB management approaches ¿ dynamic memory mapping, static memory mapping with replaceable TLB entries, and static memory mapping with fixed TLB entries (no TLB misses) on a IBM BlueGene/P system. Runtime System Scalability: We show that a runtime system can efficiently incorporate system services and improve scalability for a specific class of applications. We design and implement a full-featured runtime system and programming model to execute irregular appli- cations on a commodity cluster. The runtime library is called Global Memory and Threading library (GMT) and integrates a locality-aware Partitioned Global Address Space communication model with a fork/join program structure. It supports massive lightweight multi-threading, overlapping of communication and computation and small messages aggregation to tolerate network latencies. We compare GMT to other PGAS models, hand-optimized MPI code and custom architectures (Cray XMT) on a set of large scale irregular applications: breadth first search, random walk and concurrent hash map access. Our runtime system shows performance orders of magnitude higher than other solutions on commodity clusters and competitive with custom architectures. User-level Scalability Exploiting Hardware Features: We show the high complexity of low-level hardware optimizations for single applications, as a motivation to incorporate this logic into an adaptive runtime system. We evaluate the effects of controllable hardware-thread priority mechanism that controls the rate at which each hardware-thread decodes instruction on IBM POWER5 and POWER6 processors. Finally, we show how to effectively exploits cache locality and network-on-chip on the Tilera many-core architecture to improve intra-core scalability.

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Golder, Andrew S. Miu Karen Nan. "Photovoltaic generator modeling for large scale distribution system studies /." Philadelphia, Pa. : Drexel University, 2006. http://hdl.handle.net/1860/1220.

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Qiu, Tongqing. "Understanding a large-scale IPTV network via system logs." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41228.

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Recently, there has been a global trend among the telecommunication industry on the rapid deployment of IPTV (Internet Protocol Television) infrastructure and services. While the industry rushes into the IPTV era, the comprehensive understanding of the status and dynamics of IPTV network lags behind. Filling this gap requires in-depth analysis of large amounts of measurement data across the IPTV network. One type of the data of particular interest is device or system log, which has not been systematically studied before. In this dissertation, we will explore the possibility of utilizing system logs to serve a wide range of IPTV network management purposes including health monitoring, troubleshooting and performance evaluation, etc. In particular, we develop a tool to convert raw router syslogs to meaningful network events. In addition, by analyzing set-top box (STB) logs, we propose a series of models to capture both channel popularity and dynamics, and users' activity on the IPTV network.

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Matton, Jonas. "Tradeoffs Between Quality Attributes in a Large Telecommunication System." Thesis, Blekinge Tekniska Högskola, Institutionen för programvaruteknik och datavetenskap, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4258.

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Modern telecommunication applications must provide high availability and performance. They must also be maintainable in order to reduce the maintenance cost and time-to-market for new versions. Previous studies have shown that the ambition to build maintainable systems may result in very poor performance. Here we evaluate an application called SDP pre-paid and show that the ambition to build systems with high performance and availability can lead to a complex software design with poor maintainability. We show that more than 85% of the SDP code is due to performance and availability optimizations. By implementing a SDP prototype with an alternative architecture we show that the code size can be reduced with an order of magnitude by removing the performance and availability optimizations from the source code and instead using modern fault tolerant hardware and third party software. The performance and availability of the prototype is as least as good as the old SDP. The hardware and third party software cost is only 20-30% higher for the prototype. We also define three guidelines that help us to focus the additional hardware investments to the parts where it is really needed.

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Ren, Kan. "System for intuitive interaction with large-scale visual databases." Thesis, University of Surrey, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540707.

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Li, Fang. "An automated generalized system for large scale topographic maps." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387080.

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Turnbull, Martin John. "A design for a large scale distributed operating system." Thesis, University of Hertfordshire, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329070.

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Martin, Philippe J. F. "Large scale C3 systems : experiment design and system improvement." Thesis, Laboratory for Information and Decision Systems, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15061.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1986.
Includes bibliographical references (p. 105-106).
Research supported by the Joint Directors of Laboratories through the Office of Naval Research. N00014-85-K-0782
Philippe J. F. Martin.
M.S.

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Yao, Huan 1976. "Utterance verification in large vocabulary spoken language understanding system." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47633.

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Lange, Werner R., and Martin Ravensbergen. "TIME REFERENCE SYSTEM OF THE ESO VERY LARGE TELESCOPE." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/608540.

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International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada
The necessity of supplying precise time information in large telemetry ground stations and astronomical observatories is very similar. Therefore the way of solving this problem as it is done in the Very Large Telescope of the European Southern Observatory can be easily adopted to telemetry stations and ranges, especially when fiber optics are used. The European Southern Observatory (ESO) is building a new observatory in Chile for the Very Large Telescope (VLT). This VLT consists of 4 telescopes, each of them has a primary mirror diameter of 8 meters. the control architecture is based on workstations and VMEbus computers. The VMEbus computers are distributed over the whole building and are using real time operating system. Since the availability of the Global Positioning System (GPS) the generation of highly accurate timing signals on remote locations without the use of expensive Cesium standards does not create problems any more. However, distribution of a timing signal to many computer with high accuracy is an issue. The accuracy of the commonly used IRIG B-code is not adequate if the requirements are in the 10 microseconds range. This paper presents the design of a timing system that is adopted to the VLT. An overview of the requirements of the Time Reference System (TRS) is given. These requirements have been defined on the basis of experiences with the timing system of the ESO NTT telescope. The hardware units are described. These are a Central Time Standard, a Time Distribution System and a VME Time Interface Module. The distribution is based on fiber optic transmission, using a simple digital modulation that outperforms the analog IRIG B modulation. The Time Interface Module in the computer does not only perform the timing signal decoding but contains also user-programmable timers that are synchronously clocked from the time source. Presently all units of the TRS have been tested and the series production of the distribution and the Time Interface Modules are in progress.

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Van, Niekerk Kathryn. "An efficient management system for large digital object collections." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11413.

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Includes abstract.
Includes bibliographical references (leaves 87-91)
Cultures evolve continuously, and it is therefore vital to track and record these changes, and most importantly of all, manage the resulting huge mass of data such as images, video clips, audio recordings and documents. This thesis examines the design of a Web-based solution, hereafter referred to as the Information Management System (IMS), to handle the efficient, accurate and secure management of a large number of objects.

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Burghelea, Ana H. "Optimization of the maintenance of a large bridge system /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487684245465708.

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Murakami, Yoshihiro. "Development of a Scheduling System for Large Chemical Plants." Kyoto University, 1998. http://hdl.handle.net/2433/182358.

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Solanes, Bosch Júlia. "Investigation of the Performance of a Large PV system." Thesis, Högskolan i Gävle, Energisystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-25163.

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One of the main social challenges that society is facing nowadays is the energy crisis. So, head towards renewable energy resources such as solar, hydraulic, wind, geothermal and biomass, could be the best solution. Solar photovoltaic is one of the most promising sources to produce electricity due to its cleanness, noiselessness and sustainability, and the fact that it is inexhaustible. However, the power output of the PV systems varies notably because of the ambient conditions: temperature and solar radiation. The main aim of this thesis is to study if the PV system installed on the wall of the new football arena Gavlehov in Gävle is providing the amount of power promised before the installation. To achieve reliable results, the first step is to develop and install a monitoring system for recording the real power of the system and the ambient conditions at the same time. After that, an evaluation of the performance of the system during one week will be done, comparing the theoretical power and the real power obtained. The theoretical power will be calculated in two ways: using the data from a pyranometer and on the other hand, from a reference solar cell. This will permit to compare which one matches better with the reality. Different factors such as the temperature, the irradiance and the angle of incidence are studied to know the real influence that they have on the performance of a PV installation. The results obtained show that the measurement system installed is reliable and that the model used to evaluate the system is correct. It can be concluded that using a reference solar cell to calculate the theoretical power of the system is easier to align and it has the same angular behaviour as a PV module than employing a pyranometer. Regarding the installation, all the panels work similarly and the system works at nominal power. So, it provides the amount of power promised before the installation. Key words: Renewable energy, PV system, solar radiation, nominal power, pyranometer, solar cell.

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Lantz, Robert E. "Parallel SimOS : scalability and performance for large system simulation /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Jump, Addison B. "Mathematical analysis of a large-gap electromagnetic suspension system." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-06062008-154655/.

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Rowles, Craig M. 1962. "System integration analysis of a large commercial aircraft engine." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9753.

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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 1999.
10912289
Includes bibliographical references (p. 93-94).
In this thesis we develop and demonstrate a method, called a System Integration Analysis, to produce a comprehensive understanding of the activities Integrated Product Teams (IPTs) perform in designing and developing a large complex product or system. The methodology is applied to an existing product or system whose physical architecture can be partitioned into comparable sections, or chunks, as the IPTs who design and develop it. Its goal is to identify specific integrative mechanisms to better align the Integrated Product Development (IPD) process and the organization with the product architecture. These mechanisms are then developed into specific recommendations in consideration of a strategic and tactical framework for achievement of the desired future state of the organization and its IPD process. Implementation of the initiatives is directed to a comprehensive change process defined to address the cultural, structural, and political reality of the company. The methodology uses two distinct applications of a Design Structure Matrix, and several complimentary approaches to the analysis of the data. The methodology is demonstrated with a world-class commercial high bypass-ratio turbofan engine, the Pratt & Whitney PW4098. This product is a derivative design of an existing configuration, or family of engines. Recommendations based upon the PW4098 application include specific interface management and system integration improvements, a minor organizational re-alignment, stronger discipline management, and clearly defined roles and responsibilities of key players.
by Craig M. Rowles.
S.M.

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Smith, Robert Hanson 1964. "Comparative system architecture for large, government-sponsored space systems." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9757.

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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 1999.
Includes bibliographical references (leaves 108-119).
The fundamental issues in any discussion of a proposed system architecture must involve the relative quality of the architecture when compared to other proposals and the architecture's ability to satisfy the needs and abilities of the customer, the system environment and the system developer. While the latter issue can often be easily addressed through standard system architecture methods, the former comparative issue can often be quite difficult due to some of the uncertainty and ambiguity in the· relative merit of system architecture factors. In large government-funded space system architectures, which often span years of development/production and cost tens of billions of dollars, this difficulty is especially apparent and highlights the need for an effective method for comparative evaluation. This thesis research has developed a unique tool by which comparisons of system architectures ca.n be made. This technique, which is a. fuzzy set extension of the Axiomatic Design method, has the ability to incorporate and capture both technical and non-technical parameters that are vital to the comparison process. This tool is effectively applied to architectural proposals for the human exploration of Mars. As supporting objectives, the research examines the structure of advanced technology developments, explores the affects of the government budgetary process and comments on the government/contractor managerial relationship as they pertain to space system architectures.
by Robert Hanson Smith.
S.M.

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Fiaux, Jocelyne. "Solution NMR with large macromolecular assemblies : the GroE chaperonin system /." Zürich : [s.n.], 2002. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=14616.

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Brändström, Urban. "The Auroral Large Imaging System : design, operation and scientific results." Doctoral thesis, Umeå University, Space Science, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-36.

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The Auroral Large Imaging System (ALIS) was proposed in 1989 by Åke Steen as a joint Scandinavian ground-based nework of automated auroral imaging stations. The primary scientic objective was in the field of auroral physics, but it was soon realised that ALIS could be used in other fields, for example, studies of Polar Stratospheric Clouds (PSC), meteors, as well as other atmospheric phenomena.

This report describes the design, operation and scientic results from a Swedish prototype of ALIS consisting of six unmanned remote-controlled stations located in a grid of about 50 km in northern Sweden. Each station is equipped with a sensitive high-resolution (1024 x 1024 pixels) unintensified monochromatic CCDimager. A six-position filter-wheel for narrow-band interference filters facilitates absolute spectroscopic measurements of, for example, auroral and airglow emissions. Overlapping fields-of-view resulting from the station baseline of about 50 km combined with the station field-of-view of 50° to 60°, enable triangulation as well as tomographic methods to be employed for obtaining altitude information of the observed phenomena.

ALIS was probably one of the first instruments to take advantage of unintensi- fied (i.e. no image-intensifier) scientific-grade CCDs as detectors for spectroscopic imaging studies with multiple stations of faint phenomena such as aurora, airglow, etc. This makes absolute calibration a task that is as important as it is dificult.

Although ALIS was primarily designed for auroral studies, the majority of the scientific results so far have, quite unexpectedly, been obtained from observations of HF pump-enhanced airglow (recently renamed Radio-Induced Aurora). ALIS made the first unambiguous observation of this phenomena at high-latitudes and the first tomography-like inversion of height profiles of the airglow regions. The scientific results so far include tomographic estimates of the auroral electron spectra, coordinated observations with satellite and radar, as well as studies of polar stratospheric clouds. An ALIS imager also participated in a joint project that produced the first ground-based daytime auroral images. Recently ALIS made spectroscopic observations of a Leonid meteor-trail and preliminary analysis indicates the possible detection of water in the Leonid.

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Sada, Fernando Javier. "Aggregate Model of Large Wind Parks for Power System Studies." Thesis, KTH, Elektriska energisystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53747.

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This report describes the need for aggregation of wind farms due to the recent penetration of wind power generation in the power system and the methodology to simplify a distribution network consisting of a number of wind turbines equipped with induction or synchronous generators and MV lines. This methodology leads to an equivalent network which consists of an approximate equivalent wind turbine or groups of wind turbines and an approximate equivalent line or lines. The aim of the methodology is to reduce the complexity of the system and also the simulation time. Simulations are performed using a simulation software package PowerFactory supplied by DIgSilent, which is a tool for short term and long term dynamic analysis. The validation of the methodology and models used are examined by applying different layouts and considerations. The response of both detailed and aggregated models, under the same contingencies are compared. The influence of wind conditions such as wind speed and wind direction, is also considered. The project consists of two main parts. The scope of the first part is to validate an aggregation methodology with DIgSilent PowerFactory Software. The second part aims to verify a wind park aggregation considering the wake effect. In both cases the simulation time improvement is shown.

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Boustedt, Jonas. "Students working with a large software system : Experiences and understandings." Licentiate thesis, Uppsala universitet, Avdelningen för teknisk databehandling, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-85795.

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This monograph describes an empirical study with the overall aim of producing insights about how students experience the subject Computer Science and its learning environments, particularly programming and software engineering. The research takes a start in the students' world, from their perspective, using their stories, and hence, we have chosen a phenomenographic approach for our research. By interpreting the students' descriptions and experiences of various phenomena and situations, it is possible to gain knowledge about which different conceptions students can have and how teaching and the learning environment affect their understanding. In this study, we focus specifically on students' conceptions of aspects of object-oriented programming and their experiences of problem solving situations in connection with object-oriented system development. The questions posed enlighten and focus on the students' conceptions of both tangible and abstract concepts; the study investigates how students experienced a task concerning development in a specific software system, how they conceived the system itself, and how the students describe the system's plugin modules. Academic education in programming deals with abstract concepts, such as interfaces in the programming language Java. Hence, one of the questions in this study is how students describe that specific abstract concept, in a context where they are conducting a realistic software engineering task. The results show that there is a distinct variation of descriptions, spanning from a concrete to-do list, to a more advanced description where the interface plays a crucial role in order to produce dynamic and adaptive systems. The discussion interprets the results and suggests how we can use them in teaching to provide an extended and varied understanding, where the educational goal is to provide for and strengthen the conditions for students to be able to learn how to develop and understand advanced software.

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Li, William W. "LaMASS, a large-motion active suspension system for powered wheelchairs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq24183.pdf.

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Cheng, Antonio S. "A robust distrubuted storage system for large information retrieval applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0005/MQ40934.pdf.

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40

Hammond, Thomas T. "Sampled-data frequency response system identification for large space structures." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182787762.

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41

Petriccione, Gregory James. "Design and integration of a large area warpage measurement system." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/18207.

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42

Monroe, James T. "A large-scale modeling study of the California current system." Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/8607.

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Approved for public release; distribution is unlimited
A high resolution, multi-level, primitive equation ocean model is used to investigate the combined role of wind forcing, thermohaline gradients, and coastline irregularities on the formation of currents, meanders, eddies, and filaments in the California Current System (CCS) from 22.5 deg N to 47.5 deg N. An additional objective is to further characterize the formation of the Davidson Current, seasonal variability off Baja California, and the meandering jet south of Cape Blanco. The model includes a realistic coastline and is forced from rest using climatological winds, temperatures, and salinities. The migration pattern of the North Pacific Subtropical High plays a significant role in the generation and evolution of CCS structures. In particular, variations in wind stress induce flow instabilities which are enhanced by coastline perturbations. An inshore train of cyclonic eddies, combined with a poleward undercurrent of varying seasonal depths, forms a discontinuous countercurrent called the Davidson Current north of Point Conception. Off Baja, the equator-ward surface jet strengthens (weakens) during spring and summer (fall and winter). Model results also substantiate Point Eugenia as a persistent cyclonic eddy generation area. The model equator-ward jet south of Cape Blanco is a relatively continuous feature, meandering offshore and onshore, and divides coastally influenced water from water of offshore origin

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Zhang, Chaoqi. "Mechanically flexible interconnects (MFIs) for large scale heterogeneous system integration." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53637.

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In this research, wafer-level flexible input/output interconnection technologies, Mechanically Flexible Interconnects (MFIs), have been developed. First, Au-NiW MFIs with 65 µm vertical elastic range of motion are designed and fabricated. The gold passivation layer is experimentally verified to not only lower the electrical resistance but also significantly extend the life-time of the MFIs. In addition, a photoresist spray-coating based fabrication process is developed to scale the in-line pitch of MFIs from 150 µm to 50 µm. By adding a contact-tip, Au-NiW MFI could realize a rematable assembly on a substrate with uniform pads and a robust assembly on a substrate with 45 µm surface variation. Last but not least, multi-pitch multi-height MFIs (MPMH MFIs) are formed using double-lithography and double-reflow processes, which can realize an MFI array containing MFIs with various heights and various pitches. Using these advanced MFIs, large scale heterogeneous systems which can provide high performance system-level interconnections are demonstrated. For example, the demonstrated 3D interposer stacking enabled by MPMH MFIs is promising to realize a low profile and cavity-free robust stacking system. Moreover, bridged multiinterposer system is developed to address the reticle and yield limitations of realizing a large scale system using current 2.5D integration technologies. The high-bandwidth interconnection available within interposer can be extended by using a silicon chip to bridge adjacent interposers. MFIs assisted thermal isolation is also developed to alleviate thermal coupling in a high-performance 3D stacking system.

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44

Hussain, Shahbaz. "Finding Correlation and Predicting System Behavior in Large IT Infrastructure." Thesis, Linköpings universitet, Programvara och system, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-112850.

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Modern IT development infrastructure has a large number of components that must be monitored, for instance servers and network components. Various system-metrics (build time, CPU utilization, queries time etc.) are gathered to monitor system performance. In practice, it is extremely difficult for a system administrator to observe a correlation between several systemmetrics and predict a target system-metric based on highly correlated system-metrics without machine learning support. The experiments were performed on development logs at Ericsson. There were many system-metrics available in the system. Our goal is use machine learning techniques to find correlation between buildtime and other system-metrics and predict its trends in the future.

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Harson, Andrew. "A blade angle control system for large variable pitch fans." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334529.

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Hagg, Heather. "Large System Transformation within Healthcare Organizations utilizing Lean Deployment Strategies." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/415.

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"Multiple U.S. healthcare organizations have been recognized as successful in enterprise-level transformation to create healthcare delivery systems that are safe, effective, patient-centered, timely, efficient and equitable. Many of these organizations have specifically cited the development, deployment and integration of enterprise-level deployment of Lean Management Systems as key to their transformational efforts. Given the intense national interest in improving quality, efficiency and efficacy of healthcare delivery systems, a greater understanding of the strategies utilized by these organizations was required in order to provide an understanding of the mechanisms that drive successful, sustained, enterprise-level transformation. We conducted a realist review of large system transformation utilizing enterprise-level Lean Deployment methods within healthcare organizations. Synthesis and analysis of the results from this review indicate that there are five primary strategies associated with successful healthcare-based Lean deployments: Respect for People; Strategic Alignment; Strategic Deployment; Large Scale System Improvement Efforts; and Small-Scale, Local Improvement Efforts. Additional findings from this review indicate that the applications of the specific mechanisms with these strategies are emergent within multiple transitional phases spanning 6-8 years. To supplement the findings from the realist review, a series of dynamic hypotheses and system dynamics model was created in order to explore how the mechanisms and context interact to drive phase transitions within healthcare-based enterprise-level Lean deployments. The results from this model indicate that no steady state initial conditions exist that support sustained enterprise-level transformation and that the emergent nature of these deployments is necessary to overcome constraints related to the organizational capacity and capability. Additionally, we investigate the design and deployment of enterprise-level Lean programs in order to increase rate of success and decrease deployment cycles. "

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47

George, Frederick Douglas. "Usage and motivations of a large electronic bulletin board system." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14836.

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48

Chavez, Tomas, and O. Jud Strock. "How The User Relates to a Large Range Telemetry System." International Foundation for Telemetering, 1992. http://hdl.handle.net/10150/611913.

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International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California
The Telemetry Data Handling System (TDHS) at the Telemetry Data Center in White Sands Missile Range (WSMR), New Mexico, has been in operation since January 1990. It is one of the world's largest integrated range telemetry systems, and certainly the most versatile in weapons support capability. The system supports one of the world's busiest test ranges, serving all U.S. Military Services as well as NASA and others. This paper looks at the White Sands system from the user's view, examining the ways in which it is configured for several weapons tests in a typical day, and the way in which it can run foreground launch support and background pre-launch activities simultaneously. This system has grown in functional capability since its installation, both in hardware and in software. This paper analyzes that growth to see the reasons and methods. Also, near-term additional growth is addressed.

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49

Ke, Chih-Yang, and 柯志陽. "Large Area Ultrasound Positioning System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/00807843330322125469.

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碩士
國立臺灣大學
電機工程學研究所
102
Outdoor positioning systems have been matured for many years. Now days, people enjoy the service of GPS (Global Positioning System) almost everywhere at any time. However, the indoor positioning systems are still lacking. Ultrasonic devices own the advantages of low cost, simple operation etc. Unfortunately, the strength of sound wave decays quickly in the air. To overcome this disadvantage, we propose the direct sequence spread spectrum (DSSS) approach for range detection. The 4KHz rate pseudo random noise (PRN) code of 1023 chips are binary phase modulated to a 40KHz ultrasonic carrier as transmitting signal. At the receiving side, 320KHz sampler is used to collect all needed data for ranging. The complex number demodulation, correlation computation, peak detection, etc. will be applied to determine the travelling time of the signal from the transmitter to the receiver. The above value being multiplied with speed of sound will be the distance. Finally, TDOA (Time Difference of Arrival) model is used to get the position coordinate of the receiver when 4 ranging data are measured from 4 transmitters; respectively. The main contributions of spread spectrum technology are two. The first one is the high processing gain, so that the very weak ultrasonic signal can be detected even its power is less than that of environmental background noise. The second one is the fine ranging resolution, so that the positioning accuracy is improved. The proposed approach is confirmed by the indoor experiment results.

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Lin, Po-hui, and 林柏翬. "Sphere decoding for large MIMO system." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/74626999776617289738.

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碩士
國立臺灣科技大學
電子工程系
101
Since the mobile communications system as widely used today, the wireless communication system of the population is increasing. How to make the most of limited radio spectrum to be used effectively is a very important issue. Multi-Input Multi-Output (MIMO) receiver technology can effectively solve the problem of the shortage spectrum. MIMO system can solve the problem of insufficient bandwidth without increasing the bandwidth and improve spectrum efficiency. In this paper, we propose a novel SD algorithm for the large MIMO system. The proposed SD algorithm combines with the MMSE-SIC SISO detection and SD detection. Using the spirit of ML-post detection processing (ML-PDP).Two steps are in the proposed SD algorithm. First, the MMSE-SIC detection is used to obtain the likelihood ratio of the bits. Using the likelihood ratios, the unreliable bits are found and then detected by SD. Because the number of bits detected by SD is reduced, the overall complexity is also reduced. Simulation result shows the proposed SD significantly improves the complexity of conventional SD.

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Dissertations / Theses on the topic 'Large-System'

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