Dissertations / Theses: 'System leak'

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Chatzigeorgiou, Dimitris M. "A reliable & autonomous robotic in-pipe leak detection system." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100118.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 145-151).
Leaks are the major factor for unaccounted losses in every pipe network around the world (oil, gas or water). In most cases the deleterious effects associated with the occurrence of leaks may present serious economical and health problems. Therefore, leaks must be quickly detected, located and repaired. Unfortunately, most state-of-the-art leak detection systems are of limited applicability, lack in reliability or depend on user experience for data interpretation. In this dissertation we present a new, autonomous, in-pipe, leak sensing system; the "MIT Leak Detector". The proposed system is able to perform autonomous leak detection in pipes and, thus, eliminates the need for user experience. In addition, the sensing methodology under consideration is independent of pipe material and surrounding medium, thus it is widely applicable. As shown in the experimental section of the thesis, the detection principle proves to be very reliable and sensitive to small leaks in pipes. Last but not least, the robotic system is equipped with intelligence in order to use the acquired sensor signals to estimate the leak size and flow rate without user intervention. We start the thesis by describing the fundamental concept behind detection and present the proposed design. The detection principle in based on the presence of a pressure gradient in the neighborhood of any leak in a pressurized pipe. This phenomenon is translated into force measurements via a carefully designed and instrumented mechanical embodiment. In addition, an analytic dynamic model of the robotic detector is derived. Further study and analysis show that the proposed system can sense leaks at any angle around the circumference of the pipe by utilizing two force measurements at specific locations. Finally, a prototype is built and experiments are conducted in controlled laboratory conditions in compressed air pipes.
by Dimitris M. Chatzigeorgiou.
Ph. D.

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Chatzigeorgiou, Dimitris M. "Analysis and design of an in-pipe system for water leak detection." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62529.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 131-133).
Leaks are a major factor for unaccounted water losses in almost every water distribution network. Pipeline leak may result, for example, from bad workmanship or from any destructive cause, due to sudden changes of pressure, corrosion, cracks, defects in pipes or lack of maintenance. The problem of leak becomes even more serious when it is concerned with the vital supply of fresh water to the community. In addition to waste of resources, contaminants may infiltrate into the water supply. The possibility of environmental health disasters due to delay in detection of water pipeline leaks have spurred research into the development of methods for pipeline leak and contamination detection. This thesis is on the analysis and design of a floating mobile sensor for leak detection in water distribution pipes. This work covers the study of two modules, namely a "floating body" along with its "sensing module". The Mobility Module or the floating body was carefully studied and designed using advanced CFD techniques to make the body as non-invasive to the flow as possible and to avoid signal corruption. In addition, experiments were carried out to investigate the effectiveness of using in-pipe measurements for leak detection in plastic pipes. Specifically, acoustic signals due to simulated leaks were measured and studied for designing a detection system to be deployed inside water networks of 100mm pipe size.
by Dimitris M. Chatzigeorgiou.
S.M.

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Mitchell, David. "A long-range spectroscopic methane leak sensor system using a high power raman amplifier." Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=12841.

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Moroze, Noah(Noah F. ). "Kronos : verifying leak-free reset for a system-on-chip with multiple clock domains." Thesis, Massachusetts Institute of Technology, 2021. https://hdl.handle.net/1721.1/130704.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February, 2021
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 97-99).
Notary [3] uses formal verification to prove a hardware-level security property called deterministic start for a simple system-on-chip (SoC). Deterministic start requires that an SoC's state is fully reset by boot code to ensure that secrets cannot leak across reset boundaries. However, Notary's approach has several limitations. Its security property requires that all of the SoC's microarchitectural state can be reset to known values through software, and the property and proof technique apply only to SoCs with a single clock domain. These limitations prevent Notary's approach from being applied to more complex systems. This thesis addresses these limitations through Kronos, a system consisting of a verified SoC that satisfies a new security property called output determinism. Output determinism provides the same security guarantees as Notary without requiring that all of an SoC's state be reset by software. The SoC used in Kronos, called MicroTitan, is based on the open-source OpenTitan [16] and includes multiple clock domains. This thesis evaluates Kronos and demonstrates that existing open-source hardware can be modified to satisfy output determinism with minimal changes, and that the process of proving output determinism reveals hardware issues that violate desired security guarantees.
by Noah Moroze.
M. Eng.
M.Eng. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science

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Vijayaraghavan, Vishnu Karthik. "Methodology to quantify leaks in aerosol sampling system components." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/1195.

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Filter holders and continuous air monitors (CAMs) are used extensively in the nuclear industry. It is important to minimize leakage in these devices and in recognition of this consideration, a limit on leakage for sampling systems is specified in ANSI/HPS N13.1-1999; however the protocol given in the standard is really germane to measurement of significant leakage, e.g., several percent of the sampling flow rate. In the present study, a technique for quantifying leakage was developed and that approach was used to measure the sealing integrity of a CAM and two kinds of filter holders. The methodology involves use of sulfur hexafluoride as a tracer gas with the device being tested operated under dynamic flow conditions. The leak rates in these devices were determined in the pressure range from 2.49 kPa (10 In. H2O) vacuum to 2.49 kPa (10 In. H2O) pressure at a typical flow rate of 56.6 L/min (2 cfm). For the two filter holders, the leak rates were less than 0.007% of the nominal flow rate. The leak rate in the CAM was less than 0.2% of the nominal flow rate. These values are well within the limit prescribed in the ANSI standard, which is 5% of the nominal flow rate. Therefore the limit listed in the ANSI standard should be reconsidered as lower values can be achieved, and the methodology presented herein can be used to quantify lower leakage values in sample collectors and analyzers. A theoretical analysis was also done to determine the nature of flow through the leaks and the amount of flow contribution by the different possible mechanisms of flow through leaks.

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Coimbatore, Subramanian Shankar Ram. "A diagnostic system for air brakes in commercial vehicles." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5857.

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This dissertation deals with the development of a model-based diagnostic system for air brake systems that are widely used in commercial vehicles, such as trucks, tractor-trailers, buses, etc. The performance of these brake systems is sensitive to maintenance and hence they require frequent inspections. Current inspection techniques require an inspector to go underneath a vehicle to check the brake system for possible faults, such as leaks, worn brake pads, out-of-adjustment of push rods, etc. Such inspections are time consuming, labor intensive and difficult to perform on vehicles with a low ground clearance. In this context, the development of an onboard/ handheld diagnostic tool for air brakes would be of significant value. Such a tool would automate the brake inspection process, thereby reducing the inspection time and improving the safety of operation of commercial vehicles. In this dissertation, diagnostic schemes are developed to automatically detect two important and prevalent faults that can occur in air brake systems Ã¢ÂÂ leaks and out-of-adjustment of push rods. These diagnostic schemes are developed based on a nonlinear model for the pneumatic subsystem of the air brake system that correlates the pressure transients in the brake chamber with the supply pressure to the treadle valve and the displacement of the treadle valve plunger. These diagnostic schemes have been corroborated with data obtained from the experimental facility at Texas A&M University and the results are presented. The response of the pneumatic subsystem of the air brake system is such that it can be classified as what is known as a Ã¢ÂÂSequential Hybrid SystemÃ¢ÂÂ. In this dissertation, the term Ã¢ÂÂhybrid systemsÃ¢ÂÂ is used to denote those systems whose mathematical representation involves a finite set of governing ordinary differential equations corresponding to a finite set of modes of operation. The problem of estimating the push rod stroke is posed as a parameter estimation problem and a transition detection problem involving the hybrid model of the pneumatic subsystem of the air brake system. Also, parameter estimation schemes for a class of sequential hybrid systems are developed. The efficacy of these schemes is illustrated with some examples.

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Freas, Rosemarv M. "Analysis of required supporting systems for the Supercritical CO2 power conversion system." Thesis, Cambridge Massachusetts Institute of Technology, 2007. http://hdl.handle.net/10945/2992.

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Recently, attention has been drawn to the viability of using S-CO(2) as a working fluid in modern reactor designs. Near the critical point, CO2 has a rapid rise in density allowing a significant reduction in the compressor work of a closed Brayton Cycle. Therefore, 45% efficiency can be achieved at much more moderate temperatures than is optimal for the helium Brayton cycles. An additional benefit of the S-CO2 system is its universal applicability as an indirect secondary Power Conversion System (PCS) coupled to most GEN-IV concept reactors, as well as fusion reactors. The United States DOE's GNEP is now focusing on the liquid Na cooled primary as an alternative to conventional Rankine steam cycles. This primary would also benefit from being coupled to an S-CO2 PCS. Despite current progress on designing the S-CO2 PCS, little work has focused on the principal supporting systems required. Many of the required auxiliary systems are similar to those used in other nuclear or fossil-fired units; others have specialized requirements when CO2 is used as the working fluid, and are therefore given attention in this thesis. Auxiliary systems analyzed within this thesis are restricted to those specific to using CO2 as the working fluid. Particular systems discussed include Coolant Make-up and Storage, Coolant Purification, and Coolant Leak Detection.
Contract number: N62271-97-G-0026.
US Navy (USN) author

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Kleczyk, Ewa Jadwiga. "Incidence and Costs of Pinhole Leak Corrosion and Corporate Cost of Capital Borrowing." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29901.

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The first part of this doctorate dissertation examines the factors influencing the occurrence and costs of pinhole leak corrosion as well as the household decisions for corrosion prevention and plumbing material selection. Three mail surveys of households were used to elicit the experiences with leaks as well as the optimal corrosion prevention and material choices. Probability modeling (i.e. MNL) and linear regression analysis were used to analyze survey responses. Pinhole leak occurrences were found associated with pipe type installed, property age, pipe failure history, and dwelling distance from a water treatment plant. The number and location of pinhole leaks in the dwelling and the pipe type are associated with the financial costs of pinhole leaks. The corrosion prevention choices as well as the plumbing materials depended on the risk of corrosion and cost associated with each option. Previous experiences with pinhole leak impacted the decision for household choices. Faster responses to pinhole leak outbreaks by utility managers and policymakers in terms of advising homeowners on the best ways of responding to leaks would assist homeowners in reducing costs of pinhole leak repairs and associated damages. The second part of this document deals with the debt financing issues. Debt financing decisions are made simultaneously by lenders and borrowers. Since lenders are unable to observe directly the firms’ investment decisions, the banks offer contracts based up on firms’ observable characteristics (i.e. wealth and size) and the prevailing market conditions. When deciding on the financing decisions, firms also take into account the changes in macroeconomic variables in order to lower the cost of borrowing. As a result, the goal for this article is to examine empirically the hypothesis of the effect of the debt determinant as well as the macroeconomic variables on the debt maturity structure. A reduced form of the simultaneous financing decisions model is estimated by employing several OLS estimation methods. The empirical findings offer strong support for firms with few growth options, large, and of low quality having more long-term debt in their capital structure. There was, however, no clear support for the impact of macroeconomic variables on debt maturity as some variables were not statistically significant.
Ph. D.

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Mounce, Stephen Robert. "A hybrid neural network fuzzy rule-based system applied to leak detection in water pipeline distribution networks." Thesis, University of Bradford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.695062.

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Mirza-Tolouee, Changiz M., and n/a. "Experimental study of zeotropic refrigerant mixture HFC-407C as a replacement for HCFC-22 in refrigeration and air-conditioning systems." Swinburne University of Technology, 2006. http://adt.lib.swin.edu.au./public/adt-VSWT20070416.141307.

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HCFC-22 is the world�s most widely used refrigerant. It serves in both residential and commercial applications, from small window units to large water chillers, and everything in between. Its particular combination of efficiency, capacity and pressure has made it a popular choice for equipment designers. Nevertheless, it does have some ODP, so international law set forth in the Montreal Protocol and its Copenhagen and Vienna amendments have put HCFC-22 on a phase out schedule. In developed countries, production of HCFC-22 will end no later than the year 2030. Zeotropic blend HFC-407C has been established as a drop-in alternative for HCFC-22 in the industry due to their zero Ozone Depletion Potential (ODP) and similarities in thermodynamic properties and performance. However, when a system is charged with a zeotropic mixture, it raises concerns about temperature glide at two-phase state, differential oil solubility and internal composition shift. Not enough research has been done to cover all aspects of alternative refrigerants applications in the systems. This research intended to explore behavior of this alternative refrigerants compare to HCFC-22 and challenges facing the industry in design, operation service and maintenance of these equipments. The purpose of this research is to investigate behavior of R407C refrigerant in chiller systems. This includes performance and efficiency variations when it replaces R22 in an existing system as well as challenges involved maintaining the system charged with R407C. It is a common practice in the industry these days to evacuate and completely recharge when part of the new refrigerant blend was leaked from the system. This has proved to be extremely costly exercise with grave environmental ramifications. This research is intended to address challenges faced in the real world and practical terms. Theoretical and experimental approaches used as a methodology in this work. The system mathematically modeled to predict detailed system performance and effect of the leak at various conditions. To make this feasible and accurate enough, two separate approaches made, first system performance for pure R22 and R407C, and second system subjected to range of leak fractions. The earlier model was relatively straight forward when compared to the latter. Modeling a system charged with R407C ternary mixture and subjected to range of leaks posed enormous challenges. A sophisticated experimental test apparatus was also designed and built. Comprehensive and detailed tests at various conditions were conducted with special attention on instrumental accuracy and correct methodology. The first part has been successfully modeled and predicted all the factors and performance with excellent accuracy when compared to the test results. In these approaches pure refrigerants R22 and R407C were used and simulated the system behavior at range of conditions. However, the second part was the most challenging ever. Comprehensive leak process simulations produced trends of R32/R125/R134a composition change as function of rate of leak. Starting from this point, equations have been created to represent the composition change as function of percentage of the leak. The system thermodynamic cycle was also modeled to calculate capacity, power input and COP at the range of the conditions. Despite many affecting parameters and complexity of the model, the mathematical model successfully predicted the test outcome with a very reasonable accuracy, averaging around 3% with some times reaching to 5 to 6%. On the experimental stage the system charged with the new HFC-407C was deliberately subjected to refrigerant leak at various leak stages. The aim was to objectively determine to what extend the gas leak can be still acceptable without going through the expensive complete gas charge. The effect of leak was tested and verified at 10% steps, from 10% up to 50% mass fraction for the total charge. It has been observed that at the leaks beyond 30%, the adverse effect on the capacity becomes more significant, from 8 to about 15% decrease. While the power input decreased at slower pace, from 3% up to about 8% depending on the test conditions. This translated to COP decrease ranging from 4 to about 7%. This capacity loss and efficiency decrease are significant figures which suggests that the system, here chiller, can not be allowed to degrade the performance to that extend and still continue operating.

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Nelson, Berg Joakim, and Jonathan Lee. "A pre-study on the compressed air system at Ljunghaell AB." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-25648.

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The Swedish industry uses large volumes of compressed air. The compressed air process isenergy intensive and creates large amounts of excess heat. It is therefore important to utilizethe excess heat, optimize the operation of the compressors and to have a regular maintenanceon the system. This thesis is a pre-study to make a compressed air system energy efficient andis done in collaboration with Ljunghäll AB. Ljunghäll AB is one of Northern Europe's leadingdie casting companies and are located in Södra Vi, Sweden. The purpose is to describe andmap the compressed air system in the old part of the facility in Södra Vi. The thesis will alsogive an explanation of how Ljunghäll AB can improve the compressed air system. Providethem suggestions for energy savings and lower the environmental impact of production. Theobjective of the thesis is to create an understanding of how improvements in the compressedair system can be done by studying the operation, compressor, pipe system and leak detecting.The economic aspects of the solutions together with the effect of noise and engine operationof the compressors have not been taken into consideration. To reach improvement measures avisit to the facility in Södra Vi was made, where measuring and mapping was executed andthen compared with earlier studies and literature. The conclusions of the thesis show thatLjunghäll AB has a good operation and control of the compressors, through the variable speeddrive and steering system. It also showed that the choice of the existing compressors are goodfor their compressed air usage. The study also resulted in the following suggestions for theenergy efficiency and lowering of the environmental impact of production at Ljunghäll AB’scompressed air system: Water heat recovery, replacement of old pipes, cover the leakage,regular maintenance of compressors and fittings, training in compressed air for workers,centralized compressor central and sectioning of the pipe system.

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Bektas, Hayrettin Onur. "Developing A Methodology For Finding Network Water Losses Using Information Technologies: A Case Study." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612773/index.pdf.

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This study aims to develop an integrated methodology for finding water leaks in a water distribution network. The integrated methodology is formed from SCADA System, Customer Information System (CIS), and Geographic Information System. The methodology is based on forming district-metered areas (DMA) and sub-DMAs in pressure zones by isolation of the network. Leaking spots in the network are localised by step testing within the DMA. With leak noise loggers leaking spots are localized with an increased accuracy and finally pinpointed by ground microphones. Minimum night flows are observed from the SCADA system before and after the repairs of the leaks to calculate physical water loss percentage in the DMA. Monthly non-revenue water percentage is calculated using the data obtained from SCADA and CIS. With a buffer analysis on the water distribution network data, the benefit of the leak noise loggers is maximized and the working time with the ground microphones are minimized. The methodology is applied in two different DMAs in Antalya water distribution network with different characteristics. In the first DMA, only the developed methodology is applied and a decrease of 19.2% is achieved in physical water losses. In the second DMA, pressure reduction is added to the methodology and a decrease of 4.9% is achieved.

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Casselman, Thomas J. A. (Thomas James Arthur). "Beyond the lean startup : applying the lean startup methodology in established firms." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/105293.

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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, Engineering Systems Division, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 60-62).
The lean startup methodology has been successfully applied to product development at startup companies, however many of its principles may also be of benefit to established firms. The purpose of this research was to explore the benefits of the lean startup methodology in established organizations. An electronic survey was administered to product managers and engineers at 44 established companies from diverse industries as well as posted on relevant online community groups. Follow-up up interviews were conducted with select respondents for further in-depth analysis. A total of 44 individuals completed the survey and 5 follow-up interviews were conducted. Overall, 11 respondents (25%) reported use of the lean startup methodology at established firms. Success with the methodology was reported in 6 cases. A high proportion of respondents (66%) were not familiar with the method; however, did report use of specific principles aligned with the lean startup method. Results also suggested that use of the methodology was more frequent in environments with high uncertainty and in companies less than 20 years old. Interview results corroborated survey findings and highlighted barriers to implementation. The findings of this work suggest that the lean startup methodology may provide benefit to established firms, however the application of this method in this context is in its infancy. Implications for best practice and directions for future research are also discussed.
by Thomas J. A. Casselman.
S.M. in Engineering and Management

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Alharbi, Hossen H. S. M. "Leak detection in long pipelines systems." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/22978/.

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Leakage in any fluid distribution network or conveying systems results in consumption of resources and time, and its impacts affect the on the environment and the profits for any asset owner. Moreover, a sufficient and applicable leak detection system, especially, in the oil/gas industry, comes at a high cost and time consuming, sometimes affects the system's productivity. Because of its simplicity and encouraging results from the theoretical, experimental and real field tests, the water hammer phenomenon promises shows great benefits. This work has tried to utilise the routine transient events, raising the pump flow rate, to detect the leak. Also, it attempted to draw on some successful theoretical techniques, the cross-correlation and its second derivative, to apply on a real field system. To achieve that, some theoretical and experimental stages had to be carried out first. The real system was scaled theoretically to form a laboratory apparatus, so it could be fitted in a Contaminant Ingress into Distribution Systems (CID) laboratory at the University of Sheffield. The leak approach was tested by means of a numerical code for this design before construction of the rig. Then, the experimental rig was completed and the data collected from it. In the real field system, the shortage in the data frequency is an obstacle to applying the approach. The researcher's colleagues tried their best to improve the data acquisition system to meet the requirements. Although the improvement made to the system in terms of the time precision was impressive, the sample frequency increment was under the desirable level. The signal analysis approach was worked as expected theoretically, empirically the results were limited. Some trials were conducted to enhance the signal features. Later, some issues were raised and clarifications were added.

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Hassanzadeh, Rad Marjan. "Lead Time Reduction Case study:BEAB etikett & system AB." Thesis, Högskolan i Borås, Institutionen Ingenjörshögskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18837.

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In today’s competitive business world, companies require small lead times, low costs andhigh customer service levels to survive. Because of this, companies have become morecustomer focused . The result is that companies have been putting in significant effort toreduce their lead times.The purpose of this master thesis was to reduce lead time at BEAB etikett & system AB(BEAB) by focusing both on ordering and production times. In order to achieve this allprocesses from receiving an order to shipment of the order are mapped in a current statemap. Some changes based on the Toyota Production System (TPS) were implemented.The results were then mapped in a future state map.BEAB has more than 30 years experience of producing labels in different sizes andshapes. The products’ range varies from hanger labels on clothing to self adhesive labelsfor pallets. Due to globalization and stiff competition, the 8 days lead time at BEAB hasto be reduced so that they could maintain their customers, and even increase theircustomer base.It was found that the most appropriate mapping method for lead time reduction wasValue Stream Mapping (VSM). From the results achieved by VSM it was obvious thatthe press machines were bottlenecks. In order to increase their capacity, their change overtime should be reduced. Another observation derived from the VSM, was that a neworder passing through the ordering department is an unnecessary step. Some otherrecommended changes based on applying TPS are:• Reduction of work in process inventory (WIP)• Reduction of waiting time between press and converter• Stop the process to build in quality (this sounds awkward)• Collect more information• Implementation of the 5S methodologyBy implementing these changes, the future state map was created and the total lead timewas reduced from 8 days to 6 days. The production lead time reduced from 4.35 days to 4days.
Uppsatsnivå: D

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Gühl, Tomáš. "Vztah ERP systémů a lean principů." Master's thesis, Vysoká škola ekonomická v Praze, 2014. http://www.nusl.cz/ntk/nusl-192450.

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This thesis deals with the relation between ERP systems and lean principles. More specifically, the utility of these principles in conjunction with ERP systems for small and medium-sized companies supplied by Czech companies. The basic building block is then practical experience and interviews with experts. That all from both sides of the business relationship (supplier and client). The work does not only evaluate the relationship of mentioned systems and lean principles, or their usefulness in the Czech environment, but also provides complete material for basic awareness regarding these issues and answers to fundamental questions that I (or interviewed experts) choose like interesting. The thesis ends with finding the truth of the basic thesis and recommendations for possible implementation or integration of ERP systems and lean principles.

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Hou, Billy. "Lean supply chain in pharmaceutical industry : modeling and simulation of a SAP environment." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/76918.

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Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 61-62).
The global pharmaceutical business environment has been rapidly changing and has more competitive. Competition in pharmaceutical industry extended far beyond the traditional battle field, research and development. Bayer AG, a leading pharmaceutical company, decided to evaluate lean management as a tool to improve their competitiveness in the market. This thesis attempts to understand the system impact of the lean management implementation to the Bayer supply chain using modeling and simulation tools. The results of the model will be used to determine the system characteristics of current practice and lean practice. The objective of this thesis is to use the system characteristics generated from the simulation models and provide implementation recommendation to Bayer AG.
by Billy Hou.
S.M.in Engineering and Management

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Fugate, Jeremiah S. "LEAN FIRE MANAGEMENT: A FOCUSED ANALYSIS OF THE INCIDENT COMMAND SYSTEM BASED ON TOYOTA PRODUCTION SYSTEM PRINCIPLES." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/49.

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A primary role of the Incident Command System is to learn from past incidents, as illustrated by its origins in the wildland firefighting community. Successful emergency response operations under the Incident Command System has prompted its nationwide spread, this promulgation critically relies on the system’s capability to stabilize and continuously improve various aspects of emergency response through effective organizational learning. The objective of this study is to evaluate the potential to apply fundamental principles of the Toyota Production System (Lean manufacturing) to improve learning effectiveness within the Incident Command System. An in-depth review of literature and training documents regarding both systems revealed common goals and functional similarities, including the importance of continuous improvement. While these similarities point to the validity of applying Lean principles to the Incident Command System, a focus on the systematic learning function of the Incident Command System culminated in the discovery of gaps in approaches proposed by the Incident Command System framework. As a result, recommendations are made for adjustments in systematic problem solving to adapt Lean principles of root cause analysis and emphasis on standardization of successful countermeasures to benefit the system. Future recommendations are also proposed based on the author’s understanding of the system.

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Rubio, Monroy Mario Alberto. "Lean engineering standard work In the product development process." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106262.

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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, School of Engineering, System Design and Management Program, Engineering and Management Program, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 176-177).
This thesis proposes to use an adapted version of ESW (Engineering Standard Work) to develop an assessment that enables identification of opportunity areas for the implementation of ESW in an existing Product Development Organization, by integrating the consistency and quality of the work performed by the engineers, with the additional benefit of introducing lean engineering standardized processes that will help them to work in a more structured and efficient way. The standardization tools would add value to the organization by guiding the engineers throughout the product development process that are designed to minimize process variation introduced by the engineer and to eliminate unnecessary activities. The group of these standardized processes with the integrated Lean Engineering tools is named as LESW (Lean Engineering Standard Work), these would provide support defining crucial steps within a process or provide guidelines for specific characteristics of the product design using the current best practices to follow to complete their jobs. They would be based on firsthand experience and would be updated and validated regularly to incorporate any new data or technological developments. With LESW implemented, the engineers no longer have to work from memory. The process documentation provides a baseline, a standard, which would be referenced by any engineer whether experienced or not, and since the process is documented then it will also help to improve the learning curve of new hired engineers. A gap analysis is performed in order to understand the organization's current status vs. desired status, and then, based on the findings, a new way of working is proposed with the implementation of the best suitable lean engineering techniques applied to a product development organization, including LESW as part of the improvement. All this is done keeping the main target of making the organization more efficient, the process friendlier to the engineer, having a more stable and reliable process that can be duplicated in the entire organization. The management would also be benefitted, by having a better control of the programs, avoid delays and reduce costs by reducing the amount of errors committed by the engineers.
by Mario Alberto Rubio Monroy.
S.M. in Engineering and Management

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Sondheim, Mike. "Applying Systems Engineering and Lean Healthcare Tactics to the Veterans Health Administration Enrollment System." Digital Commons at Loyola Marymount University and Loyola Law School, 2015. https://digitalcommons.lmu.edu/etd/443.

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The Veterans Health Administration of the United States Department of Veteran Affairs has been reported to have a large backlog of patients waiting for healthcare services. The root cause of the issue has been pinpointed to flaws in the VHA's Healthcare Eligibility Center process and software systems. But moreover, the issues within the VHA stem from a lack of management oversight and lack of ownership of the products and services. It is suggested in the following document that the VHA apply Systems Engineering and Lean Healthcare initiatives in order to: baseline the current process and system, generate new process and system requirements aimed at meeting patient's expectations, and use Measures of Effectiveness to validate that the positive impact of the changes. The goal of this report is to provide solutions for the VHA fix the patient enrollment process and software systems. The VHA already has a group of Systems Engineers (called the Veterans Administration - Center for Applied Systems Engineering) that is currently working to promote Systems and ·Lean Engineering within the VHA, however they are focusing on general training as opposed to fixing the immediate issue presented in this report.

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Choi, Changrak. "Robot design for leak detection in water-pipe systems." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/70434.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 113-116).
Leaks are major problem that occur in the water pipelines all around the world. Several reports indicate loss of around 20 to 30 percent of water in the distribution of water through water pipe systems. Such loss of water represents critical waste of valuable resources, especially in countries such as Saudi Arabia where water is scarce. Moreover, leaks provide pathways for outside contaminants to enter into water pipe system which can deteriorate the quality of water and pose health risks to those drink from it. Considering these negatives, the importance of detecting where the leaks occur within vast network of water pipe system cannot be overemphasized. Further, for accurate and effective detection of the leaks, an in-pipe approach is taken which differs from previous detection methods. This thesis is on the design of mobile robotic platform that carries the necessary sensor and travels inside the water pipe systems. To begin with, experiments were carried out to investigate the suitability of using acoustic sensor to detect the leaks and favorable results were obtained. Then design specification of the mobile robotic platform that will carry the sensor is discussed with brief description of each components of the robot given. As components for the mobile robotic platform, a rigid-flexible robotic joint is developed that enables the robot to travel through bends and turns. Further, a novel braking mechanism using permanent magnet is presented. The mechanism results in a friction controllable leg that can be used to slow down and control the speed of robot in the presence of water flow. Finally, possible candidates for propulsion unit are discussed and evaluated with guidance for future work to be progressed.
by Changrak Choi.
S.M.

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22

Gustavsson, Håkan. "Lean Thinking Applied to System Architecting." Doctoral thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-11717.

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Software intensive systems are an increasing part of new products, which make the business impact significant. This is especially true for the automotive industry where a very large part of new innovations are realized through the use of software. The architecture of the software intensive system will enable value creation when working properly or, in the worst case, prevent value creation. Lean thinking is about focusing on the increase of customer value and on the people who add value. This thesis investigates how system architecting is performed in industry and how it can be improved by the use of Lean thinking. The architecting process does not create immediate value to the end customer, but rather create the architecture on which value in terms of product features and functionality can be developed. A Lean tool used to improve the value creation within a process is Value Stream Mapping (VSM). We present a method based on VSM which is adapted to enable analysis of the architecting process in order to identify improvements. A study of architecting at two companies shows what effect differences such as a strong line organization or a strong project organization has on the architecting process. It also shows what consequence technical choices and business strategy have on the architecting process. In order to improve the understanding of how architecting is performed a study including architects at six different internationally well-known companies have been interviewed. The study presents the practices that are found most successful. The context of the different companies as well as the architecting practices are compared and analyzed. The early design decisions made when developing software-intensive systems are crucial to the outcome of development projects. In order to improve the decision making process a method was developed based on Real Options. The method improves the customer focus of critical design decision by taking the value of flexibility into account. This thesis provides a toolbox of knowledge on how Lean thinking can be applied to system architecting and also presents how architecting is performed in industry today.

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LeBoutillier, Janelle Catherine. "The glutamatergic system and lead toxicity." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ63208.pdf.

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Sarson, Stuart C. "Investigations in the copper-lead system." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239160.

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Arden, John Walter. "Lead in the early solar system." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257664.

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Berholt, Elin, and Josefin Bohman. "Lean inom McDonalds - McDonalds nya system." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-216680.

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Anand, Rahul. "Lean Project Control and Management System." Thesis, Purdue University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10600937.

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Information is power; when we know something, it is hard to ignore. The foundation of this thesis is to create awareness about the inadequacy of the existing project control and management system (PCMS). There is a need for rapid improvements in PCMS, and proposed actual improvements in PCMS are put forward here. Patty and Denton said, “If there is anything to be learned from the history of work-process innovation, it is that any system of principles and methods will experience a life cycle. In other words, as processes mature, innovation is required to facilitate survival, let alone growth in sales of any product or service” (Patty and Denton 2010). The PCMS for capital project delivery in the engineering procurement construction (EPC) industry is in the same situation; it has completed its cycle and is in need of innovation. This thesis describes: “What Is”, the current state of Project Control and Management System (PCMS); “What Should Be”, the practices of PCMS: and “How to Close the Gap”. The advancements in PCMS are based on concepts which are process derived from Lean concepts and principles already applied in other industries such as manufacturing, aerospace, and ship building, where they have exhibited tremendous benefits. A new classification of PCMS is explained based on its characteristics and objectives. Two models are proposed to enhance the PCMS and make it a Lean PCMS. A “Real Time Visual Control Flow System Model” is proposed to enhance the existing flow system beyond advanced work packaging and the last planner system, by incorporating aligned breakdown structure, pull planning and control, real-time control, visual control, critical chain project management, making and keeping commitments. Our “Lean PCMS” model is proposed to enhance the whole system of PCMS and achieve the desired state of excellence for PCMS. The intention of this research is to make the current PCMS a Lean PCMS and to shift the reactive approach of project controls to a more proactive approach. A case study, “How to Close the Gap”, using Kaizen methodology (only the Kaizen appraisal stage, in real settings) in a large EPC (Engineering, Procurement, and Construction) company, is described.

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Makovskij, Vitalij. "Lean productiion system implementation in Lithuanian industrial enterprises." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120801_121710-62758.

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In the final of magistral work I investigate to create model of Lean manufacturing implementation. I am mostly concentrated in studying of reasons Lean manufacturing implementation failure in Lithuanian industry. In the thirst part there is analysis of scientific – methodic literature on theme of Lean manufacturing implementation, lean manufacturing tools, main problems and difficulties implementing Lean manufacturing. In the second part there is information about surveys of trend f Lean manufacturing implementation in Lithuanian industry. Questionnaire has been concluded and sent to industrial companies. Also was made interview in 5 different companies. And for reasons identification of Lean manufacturing implementation failure I performed test in one company, where participate 5 persons. In the third part I performed the Lean manufacturing implementation model suitable for Lithuanian industry. Advantage of new model is that there is a new stage – preparation, implementing Lean manufacturing. This stage is necessary in our industry, because staff is not ready for total changes. I mind that my model would be very helpful for the beginning companies for installment Lean. The final work is consisted of four parts: introduction, analysis of scientific literature, empiric surveys and description of the new created model including the implementation. Conclusions and offers are also given together with list of literature and annexes. Scope of work is - 66 pgs. of text without... [to full text]
Baigiamajame magistro darbe nagrineju Lean gamybos valdymo sistemos diegimas Lietuvos pramonės įmonėse. Labiausiai koncentruotojos ties Lean gamybos valdymo sistemos diegimo Lietuvos pramonės nesėkmės priežasčių nustatymu ir Lean gamybos valdymo sistemos diegimo modelio sukūrimu, kuris atitiktų Lietuvos pramonei. Pirmoje dalyje atlikta mokslinės – mėtodinės literatūros analizę Lean gamybos valdymo sistemos diegimo tema, aprašiau pagrindines sąvokas. Išnagrinejau įvairius Lean gamybos valdymo sistemos diegimo aspektus. Įsisgilinau į Lean gamybos valdymo sistema bei išanalizavau Lean gamybos valdymo sistema ir Lean instrumentų pritaikimas. Antroje dalyje yra pateikiama Lietuvos pramonės įmonių Lean gamybos valdymo sistemos plėtros tendencijų tyrimus. Buvo sudaryta klausimų anketa ir išsiustos į pramonės įmonės. Taip pat atlikta interviu aplkausa ir atliktas testas su personalu. Remiantis gautais rezultatais pateikiami pasiūlymai Lean gamybos valdymo sistemos diegimui Lietuvos pramonės įmonėse. Trečioje dalyje aprašytas mano sukurtas Lean gamybos valdymo sistemos diegimo modelis Lietuvos pramonės įmonėse. Taip pat nubraižytas ir suskirstytas į modelis į diegimo etapus. Kiekviename etape yra įvardijami diegimo žingsniai. Modelio privalumas yra tame, kad jis skirtas Lietuvos pramonės įmonėms. Baigiamaji darba sudaro keturios dalis: įvadas, mokslinės literatūros analizė, empiriniai tyrimai ir sukurto modelio aprašymas. Taip pat pateiktos išvados bei pasiūlymai, literatūros sąrašas... [toliau žr. visą tekstą]

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AlMhana, Abdulrahman. "Lean Supply Chain Systems Engineering." Digital Commons at Loyola Marymount University and Loyola Law School, 2013. https://digitalcommons.lmu.edu/etd/336.

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Mahidhar, Vikram. "Designing the lean enterprise performance measurement system." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33730.

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Thesis (S.M.)--Massachusetts Institute of Technology, Engineering Systems Division, 2005.
Includes bibliographical references (p. 147-151).
The research contained in this thesis explores design attributes of the enterprise performance measurement system required for the transformation to the lean enterprise and its management. Arguments are made from the literature that successful deployment of the lean practices, across three different stages of the evolution of lean thinking, requires a supporting performance measurement system. The increase in scope of lean practices at each stage of the evolution increases the complexity in achieving synchronization across the enterprise subsystems. The research presents various attributes of the performance measurement system required at each stage and further derives the three key attributes for the design of the lean enterprise performance measurement system. These three attributes are: enterprise level stakeholder value measures, the causal relationships across performance measures at each level, and Uniform and consistent set of performance measures. A detailed case study of an aerospace and defense business of a multi-industry corporation which has embarked on a journey towards creating a lean enterprise is presented.
(cont.) It highlights several challenges in the transformation from the perspective of performance measurement. The key challenges identified are: First, disconnect between the performance measurement for the lean practices and regular business practices hinder the adoption of lean practices. This disconnect exists due to the existence of both legacy performance measures and the new measures. Second, lack of understanding of the cause-effect relationship between performance measures across different enterprise levels poses difficulty evaluating the impact of lean related efforts. Third, use of non-uniform performance measures across various enterprise subsystems leads to non-lean behavior. The theory underlying performance measurement is reviewed including the widely-accepted performance measurement frameworks suggested for the design of enterprise performance measurement system. Analysis of these frameworks reveals that none of the existing frameworks completely capture the desired attributes for the lean enterprise performance measurement system.
(cont.) To design the lean enterprise performance measurement system, this research suggests a conceptual design that explicates the use of various tools and techniques to address the critical attributes. To identify stakeholder value measures this design demonstrates the use of stakeholder value analysis. Use of system dynamics modeling and structural equation modeling is suggested to establish, validate and evolve the cause-effect relationships between performance measures. And, to maintain the uniform set of measures the creation of measures dictionary is explained. Further, research is needed to empirically validate the model as a means for successful transformation and management of the lean enterprise.
by Vikram Mahidhar.
S.M.

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Leffingwell, Luke. "Lean Enablers for Terminal Operations." Digital Commons at Loyola Marymount University and Loyola Law School, 2013. https://digitalcommons.lmu.edu/etd/416.

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Kern, Matthias. "Lean-Information-System : problemorientierte Gestaltung von Informationssystemen unter besonderer Berücksichtigung von Lean-Management /." Lohmar ; Köln : Eul, 2003. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=013210866&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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33

Omar, Khaled, and Ervin Salihovic. "Lean production system : Implementering av Lean samt dess hinder utifrån ett organisatoriskt perspektiv." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-21262.

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I denna rapport med titeln Lean production system-Implementering av produktionssystem samt dess hinder utifrån ett organisatoriskt perspektiv, granskas kategorierna organisationsteori och Lean production system inom ramen för rapportens studie av ett fordonstillverkande företag. Specifikt ligger fokus på organisationskulturer, konflikter och motivationsteorier, men även utvecklings- och förbättringsprocesser, olika typer av slöserier som frekvent dyker upp och ledarskap ägnas uppmärksamhet med avseende på att skapa en djupare förståelse för hur en befintlig organisationskultur påverkas vid implementering av Lean production system och hur slöserier kan uppstå. En av rapportens intentioner är att beskriva och analysera varför organisationer som implementerar och genomför Lean production system och integrerar detta i det egna produktionssystemet, kan uppleva svårigheter och medverka till att organisationer inte uppnår sina fulla potentialer. Föreliggande rapport använder som exempel i denna framställning företaget Volvo Cars i Göteborg som kategoriseras som en Lean hybrid. En Lean hybrid är företag som implementerat Lean production system med sitt egna produktionssystem och följer de principer Lean production system förespråkar. En viktig aspekt som underbygger syftet är att kunna beskriva de konsekvenser som sannolikt blir följden då organisationer inte anpassar strukturerna i sina produktionssystem efter vad Lean production system förespråkar om gällande förbättringsarbeten och arbetet mot att eliminera slöserier. Omvänt innebär detta att om befintliga produktionssystemen följer vissa principer och premisser, ska de verktyg och metoder som Lean production system erbjuder, vara giltiga och effektiva i målet att förbättra och förenkla Syftet med rapporten var att undersöka varför organisationer med befintliga produktionssystem stöter på hinder och problem med att implementera och genomföra Lean production system i sina organisationer, samt hur stort inflytande organisationskultur och förhållningssätt har i denna process. Rapportens metodansats utgörs av kvalitativa och kvantitativa metoder med tyngdpunkt på kvalitativ metod. En litteraturstudie har genomförts via de databaser som högskolan erbjuder. Insamling av data har skett genom observation, intervjuer och simuleringar för att få ett helhetsperspektiv på nuläget i Volvo Cars i Göteborg. Rapportens resultat visar att en specifik organisationskultur kan medverka till att produktionsnedsättande faktorer som slöserier, tröghet i information och instruktion flödet, subkulturer, konflikter och bristande motivation skapas eller fortsätter att existera, men pekar också på vikten av att en organisationskulturs policy bör gestaltas på alla nivåer i en organisationsstruk- 2 - tur. Problem och hinder kan således skapas och uppstå när det saknas en gemensam värdegrund för ledarskap, utbildning och kompetensutveckling. En konsekvens av detta är att produktionsnedsättande faktorer tenderar att bäddas in i redan befintliga och standardiserade rutiner, där förbättringsarbeten paradoxalt nog skapar en negativ utveckling av produktionsprocesser och med tiden utvecklas till typ-II slöserier.
In this report entitled Lean production system- Implementation of Lean as well as its obstacles from an organizational perspective, the categories of organization theory and Lean production system are examined in the context of the report's study of a vehicle-making company. Specifically, the focus is on organizational cultures, conflicts and motivational theories, but also development and improvement processes, different types of waste and leadership. Attention is given to creating a deeper understanding of how an existing organizational culture is influenced by implementation of Lean production systems and how wastes can occur. One of the intentions of the report is to describe and analyze why organizations that implement and carry out Lean production systems and integrate this into their own production system can experience difficulties and help organizations not achieve their full potentials. The present report uses, for example, in this study the company Volvo Cars in Gothenburg, categorized as a Lean hybrid. A Lean hybrid is a company that implemented Lean production system with its own production system and adheres to the principles lean pro duction system advocates. An important aspect that underpins the purpose isto be able to describe the consequences that are likely to be followed when organizations do not adapt the structures in their production systems according to the Lean production system and what it advocates on continuous improvement efforts and efforts to eliminate waste. Conversely, this means that if existing production systems following certain principles and premises, the tools and methods provided by the Lean production system should be valid and effective in the goal of improving and simplifying. The purpose of the report was to investigate why organizations with existing production systems encounter obstacles and problems in implementing and carrying through Lean production systems in their organizations, as well as the influence of organizational culture and approaches in this process. The method of assessment of the report consists of qualitative and quantitative methods with a focus on qualitative methodology. A literature study has been conducted through the databases offered by the university. Data collection has been through observation, interviews and simulations to get a full-view perspective at the current moment in Volvo Cars in Gothenburg. The report's results show that a specific organizational culture can contribute to the creation or continuation of production-reducing factors such as waste, inertia in information & instruction flow, subcultures, conflicts and lack of motivation. However, it also emphasizes the importance of organizational culture policy being embodied at all levels in an organizational structure. Problems and obstacles can thus be created and arise when there is no common value base for leadership, education and competence development. One consequence of this is that production-lowering factors tend to be embedded in existing and standardized practices, where improvement efforts paradoxically create a negative development of production processes and eventually develop into Type II wastes.

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Spindler, Jason A. "Lean Initiative in the Program Office (LIPO): Applying Lean Thinking to the Livelink Database System." Digital Commons at Loyola Marymount University and Loyola Law School, 2009. https://digitalcommons.lmu.edu/etd/440.

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Lean Thinking is a method of work organization that promotes the creation of value and elimination of waste. United States Department of Defense (DoD) acquisition organizations currently struggle with many non-Lean processes that inhibit cost-effective, on-time completion of projects. The author hypothesized that by applying Lean Thinking to Satellite Control and Network Systems Group (SCNG) processes, a dedicated project team would enhance unit productivity and reduce costs related to the Livelink file sharing database system. To do this, SCNG members formed a Lean project team, pursued Lean Thinking training, and applied Lean to Livelink processes. This resulted in improvements of 100% - 500% for file manipulation and data sharing processes, which saved the Government up to $8,960 per week. The project also demonstrated that Lean Thinking can successfully be applied to the acquisition program office environment.

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Parsley, David M. II. "REGRESSION ANALYSIS OF FACTORS IMPACTING PROBLEM SOLVING ENGAGEMENT WITHIN LEAN SYSTEMS IMPLEMENTATION." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/112.

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Organizations around the world have attempted to implement the concepts of the Toyota Production System (TPS), commonly referred to as Lean, with limited sustainable success. The central principles of TPS, continuous improvement and respect for people, are grounded in the Japanese values of Monozukuri and Hitozukuri. Monozukuri deals with creating or making a product, while Hitozukuri conveys the idea of developing people through learning. In order for organizations to adopt these values they must have a system that engages employees at all levels in applying problem solving to improve their work. This research uses organizational assessments obtained from a variety of organizations implementing the lean approach using the Monozukuri and Hitozukuri values, referred to as the True Lean System (TLS). This research uses an inductive research approach to identify and analyze factors that impact the use of problem solving within organizations implementing a TLS. First, the qualitative assessment data is studied using textual analysis to identify themes impacting TLS. This analysis identified three topics as the highest weighted themes: number of problem solving methods, standardization, and employee roles. This qualitative data is then transformed using an integrated design model to systematically code the information into quantitative numerical data. Finally, this data was analyzed statistically by logistic regression to identify the factors impacting the use of problem solving within these organizations. The results from the logistic regression suggest that the most successful problem solving organizations have established standards for work and training employees; as well as, a single problem solving method that all employees use when identifying and implementing continuous improvement ideas. Which leads to the conclusion, in order for an organization to sustain the concepts of TPS, there must be a focus on defining clear standardized work, training, and the implementation of a single problem solving method.

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Morgan, Thane (Thane J. ). 1962. "Lean manufacturing techniques applied to software development." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9575.

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Ippolito, Brian J. (Brian James) 1970. "Identifying lean practices for deriving software requirements." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/29884.

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Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, 2000.
Includes bibliographical references (p. 133-134).
Lean principles focus on employing value added activities to reduce product development cycle time, increase quality, and reduce cost. Lean originated in the automotive industry and has since been centered in the manufacturing domain. Lessons learned on implementing Lean initiatives have been captured by the in the Lean Aerospace Initiative (LAI) and incorporated into the Lean Enterprise Model (LEM) (http://lean.mit.edu/public/index.html). To the author's knowledge, this is the first research effort specifically designed to apply the Lean principles and the Lean Enterprise Model to the aerospace software requirement derivation process. Data supporting this research is the result of a comprehensive two-year research effort involving three detailed case studies with 45 case study interviews, 125 stakeholder surveys collected from ten aerospace software upgrades, feedback from numerous aerospace industry practitioners and Massachusetts Institute of technology (MIT) faculty. Ten aerospace software upgrades were analyzed at both an enterprise level and an organizational level to identify the presence of Lean practices. At the enterprise level, metrics typically used to measure enterprise performance (Flow Time, Stakeholder Satisfaction, Quality Yield, and Resource Utilization) were found to be appropriate for the software requirement process but not adequately implemented. An organizational analysis observed five of the twelve Lean practices as effectively implemented and identified opportunities to implement four more Lean practices.
by Brian J. Ippolito.
S.M.

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Schmidt, Marc Anthony 1970. "Application of lean principles to an enterprise value stream : a lean analysis of an automotive fuel system development process." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/88317.

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Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, 2000.
Includes bibliographical references (p. 100-101).
This thesis shows that lean principles that have been successfully applied in manufacturing can also be successfully applied across an entire enterprise. Established lean principles and lessons learned in lean manufacturing environments are applied across an automotive fuel system enterprise. This enterprise includes all major activities used in developing and delivering fuel systems to customers from the initiation of the systems concept to final production manufacturing. The value of the enterprise's product (fuel systems) is specified in terms of enterprise customers. The value stream of the fuel system enterprise is identified and analyzed using process mapping, input/output information flow diagrams, and other techniques. Major issues in terms of waiting time, rework time, and excessive need for validation are identified using these techniques. Countermeasures against these issues are offered to facilitate a transition to a leaner state. The goal is to develop a systemic understanding of the fuel system enterprise such that lean principles and tools can be applied to its processes to improve efficiency, throughput, and value for customers. Recommendations for further study are also listed in an effort to pursue perfection by continuously improving the lean enterprise. Finally, a transition to lean implementation plan is outlined.
by Marc Anthony Schmidt.
S.M.

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Ljungberg, John, and Andreas Westergren. "Development and verification of an internal equalization charge system for lead-acid batteries in hybrid power systems." Thesis, KTH, Maskinkonstruktion (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141683.

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Detta examensarbete är utfört hos Northstar Sitetel Sweden AB. Examensarbetet innehåller en produktutveckling av ny teknologi med intern utjämningsladdning förbatterier i hybrida kraftsystem till radiobasstationer. De befintliga system som användsidag, använder en dieselgenerator för att ladda batterier som sedan förser radiobasstationen med kraft. Dessa system har ofta dålig bränsleeffektivitet på grund av långa utjämningsladdningar med låg last till dieselgeneratorn. Ibland har de även dålig mätnoggrannhet vilket gör att batteri kapacitet och dieselgeneratorer ofta överdimensioneras. Studier har gjorts av olika typer av hybridsystem och även batterier, fokus har varit på en djup analys av bly batterier och hur dessa ska laddas optimalt med speciella typer av utjämningsladdningar. En simulering av tänkt system har gjorts baserat på studierna och ett verkligt system har designats och tillverkats bestående av hårdvara med mikrokontroller, elektronik samt mjukvara med laddnings- och kontrollalgoritmer. Testning med utjämningsladdning av parallellkopplade batterier har utförts. Analys av data från tester har gjorts och jämförts med de system som finns på marknaden, speciellt med hänsyn till ekonomi och driftsfall inom speciella laddningsgrader av batterierna. Resultaten visar att denna nya typ av intern utjämningsladdning fungerar väl och kan spara upp till 13,5 % i diesel förbrukning samt 260 timmars körningstid av dieselgeneratorn per år. Även mätnoggrannheten har förbättrats markant vilket gör att batteriernas kapacitet och dieselgeneratorns storlek kan minskas utan försämrad tillförlitlighet.

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Masai, Pierre. "Modeling the lean organization as a complex system." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAD029/document.

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Dans cette thèse, après avoir expliqué l'historique et les concepts principaux de l’organisation lean dans différents contextes, le monde des systèmes complexes est exploré, puis il est montré pourquoi le lean est lui-même un système complexe. Un modèle novateur du lean est proposé sous forme d'ontologie, le Lean Organization Framework (LOF), qui peut être appliqué à toutes les formes d’organisations. Le LOF est testé avec celles qui ont déjà été explorées, proposant ainsi des pistes d’amélioration (lean pour la fabrication, pour l’IT, pour les soins de santé, pour la fonction publique, pour les organisations non gouvernementales, pour les start-ups et pour l’éducation). Il peut également être appliqué à de nouveaux domaines d’activités avec l’aide d’experts dans ces domaines, une approche montrée avec les exemples nouveaux d’une fondation lean et de l’architecture d’entreprise lean (Lean EA) mais aussi en comparant l’organisation lean au système immunitaire, un exemple bien connu de système complexe. Ensuite, un modèle de processus lean est proposé, présentant les propriétés émergentes d’un système complexe, le hoshin kanri (gestion des objectifs de l’organisation), y compris dans sa dimension culturelle. Les résultats de son expérimentation pratique avec l’application eHoshin sont discutés et un premier prototype en open source est présenté, déjà utilisé à ce jour par une centaine d’organisations dans le monde. Une seconde expérimentation plus robuste dans l’industrie (Toyota, dans plusieurs fonctions et entités juridiques) est exposée. Le modèle théorique est enfin amélioré sur base des résultats obtenus. En annexe, les concepts du lean sont expliqués avec leur application à six domaines de connaissance différents et les programmes de simulations sont listés
In this thesis, after explaining the history and main concepts of the lean organization in various contexts, the world of complex systems is explored, then it is shown why the lean organization is itself a Complex System. A novel model of lean is proposed as an ontology, the Lean Organization Framework (LOF), which can be applied to all forms of organizations. The LOF is tested with those already explored (Lean Manufacturing, Lean IT, Lean Healthcare, Lean Government, Lean NGO, Lean Start-Up, Lean Education) and proposes ways to enhance them. It can also be applied to new domains with the help of subject matter experts, an approach that is checked with the novel cases of a Lean Foundation and Lean Enterprise Architecture (Lean EA), but also with the comparison of the lean organization with the immune system, a well-known Complex System example. Then, a model of lean process presenting the emergent properties of a Complex System is proposed: the hoshin kanri, or management of the organization objectives, including in its cultural dimension. The results of its practical implementation with the eHoshin application are discussed and a first open source prototype already used by around one hundred organizations in the world is explained. A second, more robust implementation in the industry is presented (at Toyota, extended to several departments and legal entities). Finally, the theoretical model is improved based on the experimentation results. In the appendices, the lean concepts are explained together with their application to six domains of knowledge and the simulation programs are listed

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41

Liao, I.-Hsiu. "Designing a lean manufacturing system a case study /." Diss., Online access via UMI:, 2005.

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Abstract:

Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Dept. of Systems Science and Industrial Engineering, 2005.
Includes bibliographical references.

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Phillips, Matthew Joseph. "Digitally-Controlled Deep Brain Stimulation Lead Implant System." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/693.

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Deep brain stimulation, the treatment of disorders by applying electrical stimulation to brain tissue, is a relatively new field of medicine with great potential to provide cures for neurological disorders. It utilizes a system very similar to a cardiac pacemaker and lead to electrically stimulate brain tissue. This electrical stimulation is programmed to disrupt or mask aberrant brain signals while not impeding the normal function of the brain. The advances in implantable pulse generators designed for deep brain stimulation have been remarkable, and the applications for deep brain stimulation continue to grow including multiple sclerosis (Berk, et al. 2002), severe psychiatric disorders (Kopell, Greenberg and Rezai 2004), and depression (Mayberg, et al. 2005). The da Vinci® Surgical System developed by Intuitive Surgical® has shown that providing surgeons with digital control of an advanced robotic surgical assistance device to be highly advantageous, however there has been minimal effort to develop a system that would provide similar advantages to deep brain stimulation surgeons. This thesis is focused on the design and utilization of a digital robotic system that will advance the safety and efficacy of the deep brain stimulation implant surgery. This is accomplished by employing current technology and custom software to control a mechanical system thereby improving relative accuracy during the deep brain stimulation lead implant procedure and providing focalized electrical stimulation. The first is achieved through digital control of motors to drive the implant procedure resulting in lead placement accuracy on a micron level and supported by computation and by FEA analysis. The latter is realized by providing the surgeon with the ability to generate curvilinear lead implant orientations which in turn concentrate electrical stimulation in a small volume of tissue with the goal of minimizing stimulation of healthy tissue and increasing battery life and supported by an electro-thermal FEA analogy.

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Murray, Collin (Collin J. ). "Lean and agile software development : a case study." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43176.

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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 2008.
"February 2008."
Includes bibliographical references (p. 89-90).
This paper looks at agile and lean development transitions for organizations that formerly used the waterfall style of development. There has been lots written about the positive aspects of agile software development and the anticipated benefits are widely touted. Through my research I became aware of significant obstacles that organizations can encounter when adopting an agile development method. The obstacles seem to be more applicable to organizations that use the waterfall development method and are compounded when legacy products exist. The intent of this thesis is to identify positive and challenging aspects for organizations that undertake a transition from waterfall development to agile development.
by Collin Murray.
S.M.

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Douglas, Freddie 1960. "Lean principles implementation in the program preparation phase." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/82689.

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Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, 2002.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (leaves 86-91).
by Freddie Douglas, III.
S.M.

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Baykut, Levent. "Opportunities for Lean Enterprise in Public Regional Transportation." Cleveland State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=csu1280952397.

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Chiluvuri, Nayana Teja. "A Trusted Autonomic Architecture to Safeguard Cyber-Physical Control Leaf Nodes and Protect Process Integrity." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/56572.

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Cyber-physical systems are networked through IT infrastructure and susceptible to malware. Threats targeting process control are much more safety-critical than traditional computing systems since they jeopardize the integrity of physical infrastructure. Existing defence mechanisms address security at the network nodes but do not protect the physical infrastructure if network integrity is compromised. An interface guardian architecture is implemented on cyber-physical control leaf nodes to maintain process integrity by enforcing high-level safety and stability policies. Preemptive detection schemes are implemented to monitor process behavior and anticipate malicious activity before process safety and stability are compromised. Autonomic properties are employed to automatically protect process integrity by initiating switch-over to a verified backup controller. Subsystems adhere to strict trust requirements safeguarding them from adversarial intrusion. The preemptive detection schemes, switch-over logic, backup controller, and process communication are all trusted components that are separated from the untrusted production controller. The proposed architecture is applied to a rotary inverted pendulum experiment and implemented on a Xilinx Zynq-7000 configurable SoC. The leaf node implementation is integrated into a cyber-physical control topology. Simulated attack scenarios show strengthened resilience to both network integrity and reconfiguration attacks. Threats attempting to disrupt process behavior are successfully thwarted by having a backup controller maintain process stability. The system ensures both safety and liveness properties even under adversarial conditions.
Master of Science

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Chaudhari, Gaurav Singh. "Information Network Design for Lean Logistics." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29677.

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Manufacturing supply chains are invariably dynamic and complicated in nature. Hence, steady state models are not sufficient for analyzing and designing supply chains. Models of supply chains must accurately capture their dynamic behavior, which is determined by the structure of the organization, and the policies adopted by management. System dynamics modeling provides a powerful framework for this purpose. The use of system dynamics models in supply chain management has thus far been limited to explaining phenomenon like the bullwhip effect, and for policy development. We provide a structured approach for policy design, which doesnâ t rely on any simulation experiments. Further, we study the impact that information network design has on the response of supply chains. We use a combinatorial approach to develop guidelines for information network design. Further, we examine the possibility of utilizing a PID information feedback structure to enhance the responsiveness of the supply chain. Lastly, we propose a combined feedback feed-forward information structure to enable a supply chain to rapidly respond to disturbances whose effects are known. The goal of this dissertation is to provide a structured approach for the design of information network structure, and operating policy.
Ph. D.

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Schlichting, Christopher Carsten. "Sustaining Lean Improvements." Digital WPI, 2009. https://digitalcommons.wpi.edu/etd-theses/1119.

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"Starting in the 1980s with the first Toyota controlled production plant in the United States (NUMMI), the idea of Lean as derived from the Toyota Production System has become a popular method to improve production processes as well as any other procedure in organizations around the world. Over the last three decades a multitude of literature on Lean implementation and consulting companies offering help with the Lean transformation have emerged. The success rate of real Lean transformations however is often estimated to lie below 10% by experts such as Clifford Ransom or members of the Society of Manufacturing Engineers (SME). This leads to the question of why most companies fail to sustain the Lean improvements that most of them are able to initiate during the early implementation stages. This thesis will therefore investigate the root causes that lead to a time dependent loss of Lean improvements from three different perspectives. One standpoint is given by the TPS beliefs which are united in the House of Lean. The second angle on the topic is drawn from an online search of expert opinions and the final evaluation is taken from analyzing a real case scenario at a plant in Trumbull, CT. After this thorough analysis of possible root causes a set of countermeasures is presented that will support an organization in avoiding the major mistakes of a Lean implementation. The three countermeasures include standardization to build a base for Lean improvements, employee involvement to assure sustainability through conviction and continuous instead of rapid improvement. Every countermeasure will be described theoretically as well as with the help of examples from real life scenarios to enable the reader to apply the suggestions immediately. A final discussion will then examine the improvements that where reached at the production plant in Trumbull, CT and show how the combination of all three countermeasures ensures the sustainability of these improvements."

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Rapberger, Wolfgang. "Lean logistic in a global environment how distance impacts lean inbound systems." Saarbrücken VDM Verlag Dr. Müller, 2007. http://d-nb.info/988719436/04.

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Norlin, Daniel, Andreas Persson, and Mikael Sonesson. "Inför Lean." Thesis, Linnaeus University, School of Computer Science, Physics and Mathematics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-6768.

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Abstract:

Sammanfattning

Bakgrund

Lean är ett arbetssätt och en arbetsfilosofi som härstammar från Henry Fords produktionssystem som först förädlats i Japan och sedan vid MIT i USA för att sedan spridas över världen under 1990-talet. Lean består av ett antal olika verktyg och metoder. Det är däremot viktigt att förstå att vissa av de verktyg och metoder som används inom Lean har funnits långt innan Lean-uttrycket skapades. Med detta i bakhuvudet så förstår man att det inte är ett nytt förbättringskoncept utan bygger på många olika verktyg som är förenade. Svårigheten att tillämpa Lean ligger dock inte i att använda sig av de olika verktygen och metoderna. Utmaningen för den organisation som vill arbeta enligt Lean är att ta till sig den kulturförändring som måste ske, den största och vanligaste barriären till en Lean-implementation är organisationskulturen.

Utifrån den bakgrunden är det först intressant att försöka identifiera faktorer som Lean-användarna anser är viktiga vid ett införande av Lean. När faktorerna är identifierade är det även viktigt att förstå varför dessa faktorer anses viktigt för att kunna lösa problemet och inte ersätta problemet med ett annat.

Syfte och forskningsfrågor

Studiens syfte är att utifrån en empirisk undersökning identifiera och med hjälp av en teoretisk referensram även förklara några av de faktorer som påverkar införandet av Lean. Vår förhoppning är att genom denna studie bidra till ett underlättat införandet av Lean. Våra Forskningsfrågor är:

Vilka framgångsfaktorer kan identifieras i Lean-införandeprocessen?
Varför är dessa framgångsfaktorer viktiga i Lean-införandeprocessen?

Genomförande

De empiriska studierna utgörs av en kvalitativ undersökning på ett fallföretag som genomgår en organisationsförändring mot att tillämpa Lean. Intervjuerna har genomförts på operativ och ledningsnivå på fallföretaget. Resultaten har sedan jämförts med ett teoretiskt ramverk med avsikt att skapa djupare förståelse för de olika identifierade faktorerna.

Resultat och slutsats

Litteraturstudien ger en förståelse för vad en organisationsförändring och Lean-implementation innebär. Då organisationskulturen är en central del i ett Lean-införande behandlas även organisationskultur i ett separat kapitel så som litteratur rörande hur människor påverkar varandra. Vid intervjuerna förklarade respondenterna vad de ansåg att Lean bestod av och hade för påverkan på arbetssituationen och företaget. Intervjuerna sammanställdes sedan i rubriker som motsvarade samtalets ämne.

I slutsatsen presenteras ett antal faktorer som förklaras djupare i analysen. För att använda sig av de faktorer som identifierats är det bra att även förstå vad dessa beror på för att kunna applicera dessa på den situation som avses. Alla implementeringar är unika och därför är det viktigt att förstå vad varje faktor har för orsak.

Nyckelord: Lean, implementering, framgångsfaktorer, organisationskultur, förändring.

Abstract

Background

Lean is a method and a philosophy that originates from Henry Ford’s production system and was first improved in Japan and then further at MIT in the USA and later spread across the world during the 1990s. Lean consists of a set of different tools and methods. However, it is important to understand that some of the tools and methods is older than Lean itself. With this in mind it is clear that Lean is not a new concept but is based upon many different tools and methods that are linked together. The difficulty of applying Lean is however not to use the tools and methods. The challenge for the organisation that wants to work according to Lean is to embrace the cultural change that needs to happen, the big-gest and most common barrier to a Lean-implementation is the organizational culture.

Based on this background it is interesting to try to identify factors that Lean-users consider to be important. Once the factors are identified it is also important to understand why these factors are important in order to solve the problem and not to replace them with another problem.

Objective

The purpose of this study is to identify and with help from a theoretical framework explain some of the factors which affect the implementation of Lean. Our hope is that this study will contribute to a simplified implementation of Lean. Our research questions are:

What success factors can be identified in a Lean-implementation-process?
Why are these key-success-factors in a Lean-implementation-process?

Realization

The empirical study consists of a qualitative study of a case company that has started to implement Lean. The interviews have been conducted in the operational and managerial level in the company. The summarized results have then been compared against a theoretical framework in an effort to create a deeper understanding of the phenomena at hand.

Results and conclusions

The literature framework provides an understanding of what an organization change and Lean implementation means. Because the organizational culture is a central part of a Lean-implementation the study explains organizational culture in a separate chapter as like literature on how people interact. In the interviews, respondents explained what they considered to be Lean and the influence Lean has on their work situation and the company. The interviews were then summarized corresponding to the topics of the discussions.

The conclusion presents a number of factors that is explained more deeply in the analysis. In order to use the factors that are identified, you need to understand the underlying causes. Every implementation is unique and therefore it is important to understand each factors cause.

Keywords: Lean, implementation, success factors, organisational culture, change.

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Dissertations / Theses on the topic 'System leak'

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