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Hyatt, Daniel (Daniel Elliot). "Proposed testing method for foam padding." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69778.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 31).
One very basic necessity for foam padding testing technology is the ability to test two different padding samples and compare the results. The current standard for testing is to use a steel anvil backing for the padding, create an impact and record the parameters of the collision. The standardized method of testing with a steel anvil backing may not truly depict which foam or padding is actually the most protective, and this project aims to demonstrate how using a more humanlike backing produces more accurate test results. The experimentation setup used a projectile shot with a known velocity at various padding samples, where both a steel anvil and urethane foam are used as separate backings for the experiment. The steel anvil represents the current industry testing standard, whereas the urethane foam is meant to physically replicate the characteristics of human flesh. Using a load cell which is calibrated with an oscilloscope, a curve of the force applied over time will be recorded for each test run. From this force curve, the peak force, total impulse, and energy dissipated were calculated for each collision. By comparing these metrics across different foam padding specimens using the two padding backings across different velocities, the effect of varying the padding backing are demonstrated in the experimental results. Although using the steel anvil backing lead to generally similar recommendations for the best padding, it does not capture a lot of the details which are necessary to truly understand how different foam specimens compare with each other. Two main conclusions are drawn regarding the difference between the steel anvil and urethane foam setups: the difference in the shape of the force over time curves and the significance of changing the velocity of the impact. Using the urethane foam backing also established two different regimes which define whether or not the padding user would feel a significant impact. The parameters of these regimes provide the best data for deciding on appropriate foam specimens. The steel anvil backing lacks any capacity to test or predict which impacts are severe enough to cause serious injury.
by Daniel Hyatt.
S.B.
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Turner, Christopher David. "State-based testing : a new method for testing object-oriented programs." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/5087/.
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State-based testing is a new method for testing object-oriented programs. The information stored in the state of an object is of two kinds: control-information and data-storage. The control-information transitions are modelled as a finite state automaton. Every operation of the class under test is considered as a mapping from starting states to a finishing states dependent upon the parameters passed. The possible parameter values are analysed for significant values which combined with the invocation of an operation can be used to represent stimuli applied to an object under test. State-based testing validates the expected transformations that can occur within a class. Classes are modelled using physical values assigned to the attributes of the class. The range of physical values is reduced by the use of a technique based on equivalence partitioning. This approach has a number of advantages over the conceptual modelling of a class, in particular the ease of manipulation of physical values and the independence of each operation from the other operations provided by an object. The technique when used in conjunction with other techniques provides an adequate level of validation for object-oriented programs. A suite of prototype tools that automate the generation of state-based test cases are outlined. These tools are used in four case studies that are presented as an evaluation of the technique. The code coverage achieved with each case study is analysed for the factors that affect the effectiveness of the state-based test suite. Additionally, errors have been seeded into 2 of the classes to determine the effectiveness of the technique for detecting errors on paths that are executed by the test suite. 92.5% of the errors seeded were detected by the state-based test-suite.
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Gustafsson, Kristian. "Improvements For An Embedded Software Testing Method." Thesis, KTH, Maskinkonstruktion (Inst.), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99331.
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Testing is a widespread subject that usually is divided into hardware testing and software testing. The software testing can be done in many different ways and there exist several standards and guidelines for successful testing. This master thesis has investigated the possibilities for improvement of a software test method used by a large Swedish company. The work has been carried out at the Integration and Verification department at the company. An investigation of the undetected defects during the test execution is carried out to explore those characteristics, which are not covered by the current testing method. The purpose with this master thesis is to evaluate the company’s testing method and to give suggestions for possible improvements in the process during the system integration phase of the development process One part of the work includes a survey by interviewing key personnel’s for getting a better insight of the problem, a thorough literature study and attendance at a course providing an overview of the system. The other part of the work was the examination of a database storing all the data related to the faults from different projects. The result from the examination shows that 4.4 percent of all the faults submitted are found after the testing phase, 79.1 percent of these faults are related to the software in the system. Further investigation showed that 51.2 percent of the total number of faults found after the test phase where related to the systems configuration database and the administrator tool for the system. The conclusion to be drawn from these results is that the testing method being used by the company is good. However, there is room for improvement for some parts of the method. Most of the faults discovered after the testing process are faults related to the system configuration database and the administrator tool for the system. The method for testing these two parts of the system should be reviewed and improved.Testning är ett stort ämne som vanligtvis delas in i hårdvaru- och mjukvarutestning. Mjukvaran i ett system kan testats på många olika sätt och det finns idag flera olika standarder och riktlinjer för hur en lyckad testning skall gå till. Detta examensarbete har utrett möjligheterna att förbättra en testmetod för mjukvara som ett stort svenskt företag använder. Arbetet har utförts på Integrations- och verifieringsavdelningen på företaget. De fel som har förblivit oupptäckta efter den ordinarietestningen har blivit undersökta för att se om dessa har något karaktärsdrag som inte stöds utav den aktuella testmetoden. Syftet med detta arbete är att utvärdera företagets testmetod och komma med förslag till förbättringar av systemintegrationsfasen av utvecklingsprocessen. En del av arbetet har innefattar en undersökning där nyckelpersoner har blivit intervjuade för att få djupare insikt av problemet, men även en litteraturstudie har genomförts samt deltagande i en kurs som gav en överblick över hur systemet fungerade. Den andra delen av arbetet var undersökningen utav en databas som innehåller all information som är relaterad till fel från olika projekt. Resultatet från undersökningen visar att 4,4 procent av alla inrapporterade fel är upptäckta efter avslutad testning och att 79,1 procent av dessa fel är relaterade till mjukvaran i systemet. Vidare undersökning visade att 51,2 procent av det totala antalet fel efter avslutad testning var relaterade till systemets konfigurations databas och administrationsverktyget för systemet. Slutsatserna man kan dra utifrån dessa resultat är att företagets testmetod är bra, men det går att förbättra vissa delar av den. De flesta felen som upptäcktes efter testprocessen var relaterade till systemets konfigurations databas samt till systemets administrativa verktyg. Den testmetod som används för att testa dessa två borde ses över och förbättras.
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Joyce, Richard Kirk. "A method of testing two-dimensional airfoils." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23721.
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Lunglhofer, Jon R. (Jon Richard). "Complete safety software testing : a formal method." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/88311.
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Kang, Bu Byoung. "Excitation method for thermosonic non-destructive testing." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/1411.
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Thermosonics is a non-destructive testing method in which cracks in an object are made visible through the local generation of heat caused by friction and/or stress concentration. The heat is generated through the dissipation of mechanical energy at the crack interfaces by vibration. The temperature rise around the area close to the crack is measured by a high-sensitivity infrared imaging camera whose field of view covers a large area. The method therefore covers a large area from a single excitation position so it can provide a rapid and convenient inspection technique for structures with complex geometry and small and closed cracks. An ultrasonic horn, originally designed for welding, has generally been used for thermosonic testing. However, it is diffcult to obtain reproducible and controllable excitation with the existing horn system because of non-linearity in the coupling; surface damage can also be produced by chattering caused by loss of contact between the tip of the horn and the structure. Therefore, the general aim of the study was to develop a reliable and convenient excitation method that should excite sufficient vibration for the detection of the defects of interest at all relevant positions in the structure and must also avoid surface damage. In this thesis, a numerical and experimental study for the development of the ex- citation method for reliable thermosonic testing is presented. Successful excitation methods for the detection of delaminations in composites and cracks in metal struc- tures are described. A simple, small wax-coupled PZT exciter is introduced as a con- venient, reliable thermosonic test system in applications where relatively low strain levels are required for damage detection such as composite plates. A reproducible vibration exciter may be su cient for thermosonic testing in some metal structures such as a thin plates. However, higher strain levels are often required in metal structures, though the required strain level is dependent on the crack size. This level of strain is not easily achieved within the reproducible vibration range because of non-linearity in the contact between the exciter and the structure. Therefore, studies are conducted with an acoustic horn with high power capability to investi- gate the characteristics of the vibration produced in a real structure with complex geometry and to develop a excitation method for achieving reliable excitation in the non-linear vibration range for thermosonic testing. An excitation method for a complicated metallic structure such as a turbine blade is also investigated and the in uence of the clamping method and the excitation signal that is input to the horn on the vibration characteristics generated in the testpiece is presented. As a result, a fast narrow band sweep test with a general purpose amplifier and stud coupling is proposed as an excitation method for thermosonic testing. This method can be ap- plied to different types of turbine blades and also to other components. One typical characteristic of a thermosonic test using non-linear vibration is the lack of repeata- bility in the amplitude and the frequency characteristic of the vibration. Therefore, vibration monitoring is necessary for reliable thermosonic testing and a Heating In- dex(HI) has been proposed as a criterion indicating whether su cient vibration is achieved in a tested structure or not. The HI is calculated from different vibration records measured by different sensors and these results are compared in this thesis. A microphone can provide a cheaper and more convenient non-contacting vibration monitoring device than a laser or strain gauge and the heating index calculated by a microphone signal shows similar characteristics to that calculated from the other sensors.
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Demmer, Rick. "Decontamination method comparison testing using simulated contamination." Thesis, Lancaster University, 2016. http://eprints.lancs.ac.uk/80223/.
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Radiological decontamination of surfaces is challenging. Cleanup tasks are typically visual or even chemically measured, but radioactive contamination is invisible and measured at extremely low levels. Different contamination events have lead to the development of hundreds of decontamination processes. Their selection balances criteria such as cost effectiveness and waste minimization. While testing on the actual system where the contaminations arises (as "field" radioactive specimens) is appropriate, doing so is expensive and time consuming. Simulating contamination with substitute contaminants requires a unique understanding of the system. This provides a less expensive, more controlled and often more informative selection method. However, not all simulation methods are reliable, reproducible, have a useful range nor are relevant to the target activity. To address these needs, a range of simulated contamination systems have been developed: ·SIMCON 1 – to simulate loose contamination on stainless steel; ·SIMCON 2 – to simulate fixed contamination on oxide coated stainless steel; ·A radiological dispersal device (RDD) or so-called “dirty bomb” contaminant to simulate fixed contamination on urban material surfaces. Over 400 individual decontamination tests have been performed with these simulants, using a range of contaminants (Cs, Zr, Am, Sr, Co) and substrates (steel, concrete, marble, limestone, granite). Review and data mining of the results of these tests has allowed for the development of an understanding of the fundamental mechanisms of interaction between contamination and surface and their role in determining decontamination efficiency. Detailed analysis of the SIMCON results demonstrates that the availability of a deliberately designed contamination simulant system allows for the comparative assessment of a wide range of decontamination methods in a common frame of reference on a “level playing field”. Though somewhat intuitively obvious, the SIMCON methods evaluation unambiguously demonstrated that chemically different contaminants may behave quite differently during a decontamination action. The exact nature of this behavior depends upon the nature of applications (loose or fixed) and the decontamination method itself. If a wide range of decontamination methods are deployed on a well-designed contamination simulant, comparison of the results of the decontamination tests may provide insight into the mechanism of contamination e.g. how it is held (loose, fixed etc.), where it is held (on the surface, in a protective oxide layer etc.) and so forth. These conclusions are reinforced by detailed consideration of the urban RDD simulant decontamination data. With respect to the contaminants themselves, it is found that cations that exhibit a pH dependent speciation, such as americium or cobalt, can demonstrate radionuclide / material substrate specific chemistry that results in contaminant precipitation at the substrate surface, especially if the material has an intrinsically alkaline surface pH. For example, in the case of Am and Co, this results in the precipitation of Am and Co oxyhydroxide species at the outer surface of materials such as concrete with consequently high percentage removal efficiencies. For cationic radionuclides such as Cs+ that do not exhibit any nuclide/material surface specific chemistry the principal material property controlling the tenacity of that nuclide during decontamination from urban material substrates is the permeability of that substrate. For substrates of similar permeability, net surface negative charge on the material substrate plays a major role in determining the tenacity of non-reactive cations such as cesium; the larger the net negative charge on the substrate surface, the more tenacious the contamination. Finally, with respect to the decontamination agents themselves, harsh, high concentration chemical agents that utilize multiple decontamination processes (acids, bases, chelants) typically have an effectiveness advantage over more dilute, one component solutions. Strongly acidic solutions achieve the highest overall % removal decontamination results. This is partly because they tend to dissolve small amounts of the substrate surface and liberate imbibed contaminants. Finally, some strippable coating based methods are found to be surprisingly effective; likely because of their chelant/absorbtive character.
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McRae, Lorelie Biggs 1963. "Surimi: The development of a new testing method." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/291467.
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Eight samples of varying qualities and ages of surimi were used in the development of a new method for testing the quality of surimi. The effects of salt, pH, concentration, heating temperatures and times, and cooling times were observed. These results were used in the development of the McRae-Manning Test. By employing this method, it was possible to determine the difference between fresh high quality surimi, fresh low quality surimi, and old surimi. For this test, surimi was mixed at a 15% concentration, heated at 90 C for 20 minutes in plastic syringes, cooled and evaluated. The surimi was evaluated by emptying the samples onto prepared transparent sheets and measuring how far the sample spreads with time. The transparent sheets had circular measurements which indicated the amount of spread. Best results were obtained when the sheets were elevated at one end.
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Isaksson, Tonie. "DEVELOPMENT OF FATIGUE TESTING METHOD OF FORWARDER BUNK." Thesis, Umeå universitet, Institutionen för fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-156793.
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The fatigue phenomena is one of the most common causes of failures in structural mechanics and is due to repeatedly applied loads. Komatsu Forest AB, one of the largest manufacturers of forest machines on planet Earth was in need of a fatigue life test of a forwarder bunk which exposes the bunk in a realistic way. Such a test extends the knowledge of the strength, but also, makes it easier to improve the evolution of the design. To develop this, knowledge about the movements, i.e. the accelerations of the forwarder and its load out in the field were of greatest importance. Therefore, measurements of angles, accelerations and strains were carried out, followed by analysis of correlations in order to know the cause of fatigue. The results showed that lateral acceleration as well as the tilting of the forwarder are responsible of the repetitive strains occurred during runtime. To simulate this in a test, a method which uses two actuators to apply forces supposed to lead to comparable strains of the bunk is developed. The method of equivalent fatigue load is used in order to simplify the more complex real life situation. Despite the complicated movement and forces on the bunks in the field, it seems possible to get an accurate fatigue test with only two actuators. The fatigue testing method showed both good and bad results of the strains at different positions. Some more refinements of the applied force components as well as the positions might be needed before such a test is executed.
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Sun, Xin. "Statistical methods for diagnostic testing: an illustration using a new method for cancer detection." Kansas State University, 2013. http://hdl.handle.net/2097/16679.
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Master of ScienceDepartment of Statistics
Gary Gadbury
This report illustrates how to use two statistic methods to investigate the performance of a new technique to detect breast cancer and lung cancer at early stages. The two methods include logistic regression and classification and regression tree (CART). It is found that the technique is effective in detecting breast cancer and lung cancer, with both sensitivity and specificity close to 0.9. But the ability of this technique to predict the actual stages of cancer is low. The age variable improves the ability of logistic regression in predicting the existence of breast cancer for the samples used in this report. But since the sample sizes are small, it is impossible to conclude that including the age variable helps the prediction of breast cancer. Including the age variable does not improve the ability to predict the existence of lung cancer. If the age variable is excluded, CART and logistic regression give a very close result.
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Kumar, Dharmendra. "A COMPUTATIONALLY EFFICIENT METHOD OF ANALYZING THE PARAMETRIC SUBSTRUCTURES." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275395.
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Stomberg, Christopher. "Specification testing with information matrix equalities /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9975043.
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Tsai, Bor-Yuan. "A hybrid object-oriented class testing method : based on state-based and data-flow testing." Thesis, University of Sunderland, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311294.
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Heath, Douglas Bradley. "A standard method for testing rotary airborne spray devices /." Title page, summary and contents only, 1985. http://web4.library.adelaide.edu.au/theses/09A/09ah437.pdf.
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Lowea, D. "Methods of non-destructive testing." Thesis, Київський національний університет технологій та дизайну, 2019. https://er.knutd.edu.ua/handle/123456789/14600.
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Jansson, Eva, and Seyed Saeid Taghavi. "Examining the quality of extruded plastic with the nondestructive testing method NAW." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2683.
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Defects in a plastic floor material produced in Tarketts factory in Ronneby are causing waste of time and material since it is noticed too late in the production line. The objective of this thesis is to investigate if the nondestructive test method NAW®, which is developed by Acoustic Agree in Ronneby, can be a solution to find the defects at an earlier stage. Nondestructive testing mainly means what the name says; quality tests of a material can be made without causing any damage. One simple example of a nondestructive testing tool is the human eye. By looking at a product defects on the surface can be found. The method used in this thesis, NAW®, is a nonlinear acoustical method. By listening to the material, information about disturbances inside the material can be gathered and interpreted to get a picture of the quality status. Although by listening it does not in this case mean by a human ear but with special equipment since the sound used is high frequent ultrasound. For several material samples, experiments were made both for the references and with introduced defects. It was hard to get definitive results since, for example, even the results for the different reference samples were differing a lot. Nevertheless there are some results pointing in the same direction which means that there is still hope for the possibility to use NAW® as a tool in the production at Tarkett. One important problem in this work is the fact that the defect material is not actually a real defect material but an imitated one with defects made by hand in the experiments. This is a possible error and has to be considered in case of further experiments. Either the imitated defects have to be “improved” or, in the ideal case, real defective material from the factory should be used to get as reliable results as possible.Defekter i golvmaterial i tillverkningen hos Tarkett i Ronneby orsakar slöseri med tid och material eftersom de upptäcks sent i produktionslinjen. Syftet med detta examensarbete är att undersöka om den oförstörande provningsmetoden NAW®, som utvecklats av Acoustic Agree i Ronneby, kan vara en lösning för att hitta defekterna på ett tidigare stadium. Oförstörande provning är helt enkelt materialprovning där föremålet som undersöks inte förstörs. Ett enkelt exempel på verktyg för oförstörande provning är ögat. Genom att undersöka ett föremål med synen kan man enkelt kvalificera ytan. Den metod som används i detta arbete, NAW®, är en olinjär akustisk metod. Genom att lyssna på materialet kan mycket information om störningar inuti materialet samlas ihop och tolkas för att få en bild av kvaliteten. För flera materialbitar har experiment genomförts både för referensmaterial och för material med imiterade defekter. Det var svårt att se entydiga resultat då exempelvis till och med resultaten för referensmaterialet var väldigt olika sinsemellan. Dock pekar vissa av resultaten åt samma håll vilket gör att hoppet lever kvar för att NAW® kan vara ett möjligt verktyg i produktionen hos Tarkett. Ett stort problem i arbetet var frånvaron av trovärdiga defekter. Defekterna tillverkades och introducerades i materialet för hand, och viss tveksamhet finns gällande likheten mellan imiterade och riktiga defekter. Detta ses som en möjlig felkälla och måste tas i beaktan för eventuellt fortsatt arbete. Antingen måste de imiterade defekterna ”förbättras” eller, som vore idealt, så kan riktigt defekt material från tillverkningen användas för att ge så trovärdiga och pålitliga resultat som möjligt.
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Banerjee, Rusha. "Fatigue Analysis of Arteries Using Finite Element Method." Thesis, North Dakota State University, 2012. https://hdl.handle.net/10365/26532.
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In this thesis, the fatigue response of arteries to four specific physiological conditions representative of various morphological changes that artery undergo during its lifetime, was explored. Single layered nonlinear elastic micromechanical model of artery was developed for this purpose.
A comparative study was completed on fatigue response, in the form of available life and shear stress accumulation, between hypertensive and normotensive arteries.
The effects of morphological changes of ageing arteries on the fatigue response of the artery were studied. Change in stiffness, arterial dilation and remodeling were taken into consideration.
The effect of undulation of the artery, due to weakening of arterial walls with age or hypertension, on fatigue response, is the third aspect of this study.
Lastly, the contribution of the surrounding linear elastic tissue material on fatigue response of the artery was investigated to reflect the in-vivo condition of artery where it is always surrounded by different tissues.
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Cho, Uichung. "Novel empirical similarity method for rapid product testing and development /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
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Wang, Yuemiao. "Simulation combined model-based testing method for train control systems." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8323/.
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A Train Control System (TCS) is utilised to guard the operational safety of the trains in railway systems. Therefore, functional testing is applied to verify consistency between the TCS and specification requirements. Traditional functional testing in TCSs is mainly based on manually designed test cases, which is becoming unsuitable for testing increasingly complex TCSs. Therefore, Model-Based Testing (MBT) methods have been introduced into TCS functional testing, to improve the efficiency and coverage of TCS testing, with application difficulties. To overcome the difficulties of applying MBT methods to test TCSs, the author introduces simulation combined MBT which combines an MBT method with simulation. Modelling method and implementation method for the proposed approach were explained in detail. Two case studies were undertaken to explore the effectiveness of the testing platform developed. The testing results obtained prove that the testing platform can be utilised to implement the functional testing of TCSs. To prove that the MBT platform is effective in detecting errors in the SUT, validation and verification was undertaken, which include validation of specification requirements and verification of the MBT platform. The testing performance is proven to be better than existing MBT methods in terms of coverage and efficiency.
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Kalhor, Roozbeh. "Accelerated Testing Method to Estimate the Lifetime of Polyethylene Pipes." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/79944.
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The ability to quickly develop predictions of the time-to-failure under different loading levels allows designers to choose the best polymeric material for a specific application. Additionally, it helps material producers to design, manufacture, test, and modify a polymeric material more rapidly. In the case of polymeric pipes, previous studies have shown that there are two possible time-dependent failure mechanisms corresponding to ductile and brittle failure. The ductile mechanism is evident at shorter times-to-failure and results from the stretching of the amorphous region under loading and the subsequent plastic deformation. Empirical results show that many high-performance polyethylene (PE) materials do not exhibit the brittle failure mechanism. Hence, it is critical to understand the ductile mechanism and find an approach to predict the corresponding times-to-failure using accelerated means. The aim of this study is to develop an innovative rupture lifetime acceleration protocol for PE pipes which is sensitive to the structure, orientation, and morphology changes introduced by changing processing conditions. To accomplish this task, custom fixtures are developed to admit tensile and hoop burst tests on PE pipes. A pressure modified Eyring flow equation is used to predict the rupture lifetime of PE pipes using the measured mechanical properties under axial tensile and hydrostatic pressure loading in different temperatures and strain rates. In total, the experimental method takes approximately one week to be completed and allows the prediction of pipe lifetimes for service lifetime in excess of 50 years.Master of Science
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Yuan, Tang. "Modular multilevel converter : submodule dimensioning, testing method, and topology innovation." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/77862/.
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The modular multilevel converter (MMC) is being developed as a core technology for the next generation of high-power, voltage source converters (VSCs). The focus of this thesis lies in the SM dimensioning, testing method and topology innovation for the MMC. First, the thesis presents a new submodule (SM) capacitor selection method, considering the three main voltage requirements: the maximum capacitor voltage, the voltage ripple and the SM voltage capability. The effect of the arm inductor is included. A quick way to estimate the capacitor ripple current stress is also provided to check the selection. Second, the thesis proposes two model assisted SM testing schemes for the MMC. The prototype SM can be thoroughly tested according to the targeted operating modes without having to build a complete MMC. During the test, the converter arm current can be faithfully achieved, which contains not only the fundamental frequency component, but also dc offset and harmonic circulating current components. One scheme is the uncompensated testing scheme, which uses fewer devices, and has simpler control and faster transient dynamics. The other is the compensated testing scheme, which requires much lower dc supply voltage, smaller coupling inductance, and provides higher current tracking accuracy in steady state. Both testing schemes have been verified through simulation and experiments. Third, the thesis proposes a compact SM topology for the MMC based on stacked switched capacitor (SSC) architecture. Feasibility study shows that the total physical volume of all capacitors in each SM can be reduced by more than 40% without significantly increasing the power loss. Design concept and control principles are presented. Practical considerations for a high-voltage, high-power system are also provided, which are demonstrated through experiments on a scaled down laboratory prototype SM. Finally, this thesis evaluates the offshore 50/3 Hz ac power transmission and the use of back-to-back (B2B) MMC for frequency conversion. The high-level design of a B2B MMC is presented. System performance is briefly evaluated using computer simulation.
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Moreno, Kevin Joel. "Predictive Simulations of the Impedance-Matched Multi-Axis Test Method Using Data-Driven Modeling." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/100147.
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Environmental testing is essential to certify systems to withstand the harsh dynamic loads they may experience in their service environment or during transport. For example, satel- lites are subjected to large vibration and acoustic loads when transported into orbit and need to be certified with tests that are representative of the anticipated loads. However, tra- ditional certification testing specifications can consist of sequential uniaxial vibration tests, which have been found to severely over- and under-test systems needing certification. The recently developed Impedance-Matched Multi-Axis Test (IMMAT) has been shown in the literature to improve upon traditional environmental testing practices through the use of multi-input multi-output testing and impedance matching. Additionally, with the use of numerical models, predictive simulations can be performed to determine optimal testing pa- rameters. Developing an accurate numerical model, however, requires precise knowledge of the system's dynamic characteristics, such as boundary conditions or material properties. These characteristics are not always available and would also require additional testing for verification. Furthermore, some systems may be extremely difficult to model using numerical methods because they contain millions of finite elements requiring impractical times scales to simulate or because they were fabricated before mainstream use of computer aided drafting and finite element analysis but are still in service. An alternative to numerical modeling is data-driven modeling, which does not require knowledge of a system's dynamic characteris- tics. The Continuous Residue Interpolation (CRI) method has been recently developed as
a novel approach for building data-driven models of dynamical systems. CRI builds data- driven models by fitting smooth, continuous basis functions to a subset of frequency response function (FRF) measurements from a dynamical system. The resulting fitted basis functions can be sampled at any geometric location to approximate the expected FRF at that location. The research presented in this thesis explores the use of CRI-derived data-driven models in predictive simulations for the IMMAT performed on a Euler-Bernoulli beam. The results of the simulations reveal that CRI-derived data-driven models of a Euler-Bernoulli beam achieve similar performance when compared to a finite element model and make similar decisions when deciding the excitation locations in an IMMAT.Master of Science
In the field of vibrations testing, environmental tests are used to ensure that critical devices or structures can withstand harsh vibration environments. For example, satellites experience harsh vibrations and damaging acoustics that are transferred from it's rocket transport vehicle. Traditional environmental tests would require that the satellite be placed on a vibration table and sequentially vibrated in multiple orientations for a specified duration and intensity. However, these traditional environmental tests do not always produce vibrations that are representative of the anticipated transport or operational environment. Newly developed methods, such as the Impedance-Matched Multi-Axis Test (IMMAT) methods achieves representative test results by matching the mounting characteristics of the structure during it's transport or operational environment and vibrating the structure in multiple directions simultaneously. An IMMAT can also be optimized by using finite element models (FEM), which approximate the device to be tested with a discrete number of small volumes whose physics are described by fundamental equations of motion. However, an FEM can only be used if it's dynamic characteristics are sufficiently similar to the structure undergoing testing. This can only be achieved with precise knowledge of the dynamical properties of the structure, which is not always available. An alternate approach to an FEM is to use a data-driven model. Because data-driven models are made using data from the system it is supposed to describe, dynamical properties of the device are pre-built in the model and is not necessary to approximate them. Continuous Residue Interpolation (CRI) is a recently developed data-driven modeling scheme that approximates a structure's dynamic properties with smooth, continuous functions updated with measurements of the input-output response dynamics of the device. This thesis presents the performance of data-driven models generated using CRI when used in predictive simulations of an IMMAT. The results show that CRI- derived data-driven models perform similarly to FEMs and make similar predictions for optimal input vibration locations.
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Lutonda, Egide. "Development of Test Method for Evaluation of Interactive Media : A comparison between two different test methods." Thesis, Karlstads universitet, Handelshögskolan (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-84776.
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This study addresses a usability testing method and the development of a new testing procedure that includes eye-tracking. By correcting errors within the system before it reaches the end-user contributes to satisfied customers, high quality, and a useful system. Testing is all-important in identifying errors in the test procedure to be sure to capture issues in the system being tested. The aim of the thesis is to analyze and examine the testing methods used in the company and present how the development of a new testing method should be suitable for the company. The traditional testing method is compared with a new testing method that includes eye-tracking. The empirical material was generated by usability testing. Other methods such as background questionnaire, observation, interview, review thinking-aloud, and pilot test were also used. In the conclusion of the study, it was found that the traditional testing method met the criteria of how a usability test should be conducted. Another conclusion was that the new testing method helps to clearly see and identify usability problems that may be present in a system.Denna studie behandlar en testmetod för användbarhet och vikten av att ta fram en ny utvecklad testmetod med hjälp av eye-tracking. Genom att korrigera fel inom systemet innan det når fram till slutanvändaren bidrar nöjda kunder, hög kvalitet och ett användbart system. Syftet med uppsatsen är att analysera och utreda testmetoder som används i företaget samt kartlägga hur utvecklingen av en ny testmetod ska vara passande till verksamheten. Detta jämför jag med den nuvarande testmetoden med implementering av eye-tracking. Uppsatsens undersökningsfrågor är således: Hur kan företagets nuvarande testmetod förbättras? Hur lätt är det för företaget att använda den nya testmetoden? Är den nya testmetoden mer användbar för företaget jämfört med deras nuvarande metod? Det empiriska materialet har framställts genom användbarhetstester. Även andra metoder, såsom bakgrundsenkät, observation, intervju, retrospektiv granskning och pilottest har använts. I studiens slutsats har det framkommit att den nuvarande testmetoden uppnår kriterier på hur en användbarhetstest ska genomföras. Ytterligare slutsats har varit att den nya testmetoden bidrar med att tydligt se och identifiera användbarhetsproblem som kan finnas i ett system.
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Mann, Timothy Lee 1950. "Critical path tracing as a diagnostic evaluation method for sequential systems." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276675.
Full textAbstract:
Diagnostic tests are designed to detect and isolate faults in sequential systems. The problem is to evaluate the effectiveness of the design. For stuck faults a diagnostic model can be used. A fault simulation strategy is presented for generating this model. First, definitions, for identifying critical inputs are derived. A definition is a statement of the conditions to sensitize an input. Then a fault free simulation is used to generate a critical value array. A critical path is traced through the sensitized inputs marked in the array using a critical value array tracing algorithm that is developed. This algorithm traces a path back in time, as required for a sequential system, to identify detectable faults for the model.
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Amoah-Kusi, Christian. "Constant Interface Temperature Reliability Assessment Method: An Alternative Method for Testing Thermal Interface Material in Products." PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2295.
Full textAbstract:
As electronic packages and their thermal solutions become more complex the reliability margins in the thermal solutions diminish and become less tolerant to errors in reliability predictions. The current method of thermally stress testing thermal solutions can be over or under predicting end of life thermal performance. Benefits of accurate testing and modeling are improved silicon yield in manufacturing, improved performance, lower cost thermal solutions, and shortened test times.
The current method of thermally stress testing is to place the entire unit in an elevated isothermal temperature and periodically measure thermal performance. Isothermally aging is not an accurate representation of how the unit will be used by the customer and does not capture the thermal gradients and mechanical stresses due to different coefficients of thermal expansion of the materials used in the thermal solution.
A new testing system, CITRAM which is an acronym for Constant Interface Temperature Reliability Method, has been developed that uses an electronic test board. The approach captures the thermal and mechanical stresses accurately and improves test time by 20-30% as a result of automation. Through this study a difference in the two methods has been identified and the new CITRAM method should be adopted as current practice.
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Chan, Tony T. T. "Ultrasonic method of non-destructive test in metals effects of grain size on ultrasound wave at various frequencies /." access abstract and table of contents access full-text, 2006. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21456276a.pdf.
Full textAbstract:
Thesis (M.Sc.)--City University of Hong Kong, 2006."Master of Science in Materials Engineering & Nanotechnology dissertation." Title from title screen (viewed on Nov. 21, 2006) Includes bibliographical references.
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NARAYANAN, VINOD A. "A BUILT-IN SELF-TESTING METHOD FOR EMBEDDED MULTIPORT MEMORY ARRAYS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1074216619.
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Li, Xiaosong. "Testing on the Common Mean of Normal Distributions Using Bayesian Method." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1301420382.
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Ramberg, Erik. "Creating an effective quality management method within software development." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-165338.
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This thesis answers how to create an effective quality assurance method within software development, especially games development. The work has mainly consisted of interviews with employees and others within the same business as well as studies of literature. The thesis also describes how the new quality management method got management acceptance, how it was implemented, what happened and recommendations. The work was conducted in 2007 and the result in this report is still, eight years later, used by the company.Denna rapport berättar hur man skapar en effektiv kvalitetssäkringsmetod inom mjukvaruutveckling, särskilt spelutveckling. Arbetet har i huvudsak bestått av intervjuer med företagets anställda såväl som andra inom samma bransch samt litteraturstudier. Rapporten beskriver även hur den nya kvalitetssäkringsmetoden förankrades i organisationen, hur den implementerades, vad som hände sen samt rekommendationer. Arbetet utfördes 2007 och såsom framgår i denna rapport används resultatet, åtta år senare, fortfarande av företaget.
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Nayfeh, Taysir H. "A direct on-line ultrasonic sensing method to determine tool and process conditions during turning operations." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-165721/.
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Skūpas, Bronius. "A Method for Semi-Automatic Evaluation and Testing of Programming Assignments." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130220_160949-60851.
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The thesis investigates the automatic and semi-automatic evaluation of programming assignments in teaching of programming, exams and competitions.
Manual evaluation of programming assignments is still dominant in programming teaching in Lithuania. In some contexts (i.e. programming competitions, basics of programming and algorithms course) there is widely applied automatic and semi-automatic evaluation of programming tasks based on black-box testing approach. However, automatic evaluation based on black-box testing is criticized for its inability to demonstrate the strengths and the weaknesses of the program being evaluated. Automatic evaluation is not capable of identifying the level of achievement in incomplete programs. The thesis addresses the problem of evaluation of practical programming assignments in Information Technology maturity exam (IT VBE). This problem involves requirements to evaluate reliably thousands of programming assignment solutions in a reasonable amount of time. The thesis presents analysis of systems for automatic evaluation of programming tasks and appropriate types of assignments. The analysis led to the improvement of the evaluation method.
The most important result of the research is the proposed way to improve the semi-automatic evaluation and testing method by increasing its interactivity. A semi-automatic assessment system is expanded by adding the components responsible for the modification of submitted programs, monitoring changes in the... [to full text]Disertacijoje nagrinėjamas automatinis ir pusiau automatinis programavimo užduočių vertinimas programavimo mokyme, egzaminuose ir varžybose. Šiuo metu informatikos mokyme Lietuvoje vis dar dominuoja rankinis programavimo užduočių vertinimas. Atskirose švietimo srityse (programavimo varžybos, algoritmavimo kursai) išplito automatinis ir pusiau automatinis programavimo užduočių vertinimas, paremtas juodosios dėžės testavimo principu. Tačiau automatinio vertinimo pagrindu gauti įverčiai kritikuojami kaip neatskleidžiantys visų pateiktos programos privalumų ir trūkumų. Ypatingai dideli vertinimo netikslumai gaunami vertinant nebaigtas programas. Disertacijoje sprendžiama Informacinių technologijų valstybinio brandos egzamino (IT VBE) praktinių programavimo užduočių vertinimo problema – siekiama gauti patikimus įvertinimus dideliam pateiktų programavimo užduočių sprendimų kiekiui per priimtiną laiką. Išanalizuotos automatinės programavimo užduočių vertinimo sistemos bei joms tinkami užduočių tipai atvedė prie idėjos tobulinti vertinimo metodą. Svarbiausias disertacijos rezultatas – pasiūlytas būdas tobulinti pusiau automatinį vertinimo ir testavimo metodą didinant jo interaktyvumą. Tam pusiau automatinė vertinimo sistema turi būti papildoma komponentais, leidžiančiais modifikuoti pateiktą programą, stebėti modifikuotos programos funkcionalumo pokyčius. Pasiūlytas patobulintas vertinimo metodas išbandytas praktiškai, sukurta IT VBE praktinių užduočių vertinimo sistema. Taikant šį... [toliau žr. visą tekstą]
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Polifroni, Mark. "The development and testing of a multi-component emotion induction method." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1141669741.
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Johansson, Olle. "Plugin-based automated testing tool för .NET assemblies : a method proposal." Thesis, University West, Department of Technology, Mathematics and Computer Science, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-561.
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Turner, Travis Henry. "Validation of a new method for neurobehavioral testing of oculomotor function." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3259051.
Full textAbstract:
Thesis (Ph. D.)--University of California, San Diego and San Diego State University, 2007.Title from first page of PDF file (viewed June 11, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 171-178).
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Cluff, C. Brent, Gary L. Amy, Gordon R. Dutt, Charles P. Gerba, Bruce C. Alleman, Susan M. Kutz, Saud A. Amer, and Carl E. Hickman. "Test of Nanofilter Method of Testing Recharged Municipal Effluent: Project Report." University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/306685.
Full textAbstract:
A Joint Effort by The John F. Long Foundation and The University of Arizona / March 1989 / Submitted To: John F. Long Foundation, Inc.Introduction: The nanofilter is a relatively new water treatment option that has been commercially available since 1986. The name nanofilter is used here as a generic name rather than a specific product name. There are at least five companies that make filter elements that can be classified as nanofilters (City of Ft. Myers, 1987). The nanofilter operates on a molecular scale and is related to reverse osmosis. Simply stated, this process treats water by forcing it through a porous membrane. The water molecules are able to pass through the membrane, as well as some of the smaller organic and inorganic molecules in the water. The larger organic and inorganic molecules are removed. The nanofilter will remove most of the dissolved solids (salinity) and hardness plus a large percentage of the dissolved organic matter including trihalomethanes (THM) precursors and essentially all of the bacteria and viruses. THM and TOX precursors are naturally occurring organics (humic and fluvic acids) that will produce THMs and organic halogens (TOX) (both are suspected carcinogens) when disinfectants such as chlorine or chloramines are added to the water. Nanofiltration has a built in safety feature in that the membrane compresses slightly as it ages which produces even better quality of water over time. In contrast activated charcoal has to be continously monitored to make sure its absorption capacity has not been used up, the quality of water deteriates over time. Nanofiltration, sometimes called membrane softening, is designed to be used for water containing 300-1200 ppm salinity. Muncipal effluent in Arizona generally has 600 to 1200 ppm salinity so this process should work well. It is particularly effective in removing dissolved organics, virus, bacteria and parasitic protozoans. The nanofilter is being used in several Florida locations. The City of Fort Myers in Florida is presently constructing the largest of these facilities, a 20 million gallon per day plant (City of Ft Myers, 1987).
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McCalib, David Jr. "Design method of a modular electronic printed circuit board testing system." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85790.
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Thesis: M. Eng. in Manufacturing, Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 52-54).
The failure rate of the printed circuit board electronic testing process is higher than acceptable at a Lenze Americas factory. This thesis will understand the root causes of failure, and use system engineering methods to decide what course of action should be taken. A Tradespace analysis is used to help decompose some of the complexity into a visualization that simplifies the decision process. The Tradespace analysis suggests that more utility can be achieved by upgrading the design of existing test fixtures versus purchasing off of the shelf solutions. The second phase will identify a design concept, offer specific design solutions, and finally a fully designed system that is capable of improving the performance of the test fixtures in electronic board test area by 50%. The system is then upgradable with in-line conveyors to run autonomously decoupling the operator from the process.
by David McCalib, Jr.
M. Eng. in Manufacturing
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Bale, Jefri Semuel. "The damage observation of composite using non destructive testing (NDT) method." Thesis, Paris 10, 2014. http://www.theses.fr/2015PA100067/document.
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L'objectif de ce travail de thèse est d'étudier le comportement de l'endommagement des matériaux composites sous chargement statique et fatigue par contrôle non destructif (C.N.D) thermographie et soutenu par émission acoustique et la tomographie (CT scan). Pour cela, ce unidirectionnels composite à fibres de verre (GFRP) et discontinue composite à fibres de carbone (DCFC) ont été utilisés comme les éprouvettes qui ont fourni par PSA peugeot citröen, France. Une série d'essais mécaniques a été réalisée pour déterminer le comportement de l'endommagement sous chargement statique et fatigue. Pendant tout des essais mécanique, la thermographie a été utilisé pour l'observation en temps réel pour suivre l'évolution des températures sur la surface de l'éprouvette et supporté par émission acoustique dans certaines conditions. Cette étude a utilisé une forme rectangulaire et se compose d'éprouvettes trouées et non trouées au centre de l'éprouvette. La vitesse de déplacement constante est appliquée pour observer l'effet sur le comportement de l'endommagement sous chargement de traction statique. Sous les essais de fatigue, le paramètre constant de la fréquence et de l'amplitude de stress a été étudiée pour chaque niveau de charge pour avoir les propriétés de fatigue et l'évolution de l'endommagement de l'éprouvette. La tomographie a été utilisée pour confirmer l'apparition de l'endommagement et l'etat du matériau après l'essai de fatigue. L'analyse des résultats de l'expérimentation et de l'observation NDT montré le bon accord entre les résultats mechnical et NDT thermographie avec prise en charge par l'observation de l'émission acoustique en détecter l'apparition et la propagation de l'endommagement de GFRP PRV et DCFC sous chargement de statique en traction. Les essais en fatigue montrent que la dissipation thermique est liée à l'évolution de l'endommagement et également thermographie et peut être utilisé avec succès pour déterminer la limite d'endurance (HCFS) et la courbe de Wöhler du matériau composite. Les résultats par CT scan ont mesurée avec succès les endommagements et l'état du matériau après essai de fatigue du matériau compositeThe aim of this study is to investigate the damage behaviour of composite material in static and fatigue condition with non destructive testing (NDT) thermography method and supported by acoustic emission and also computed tomography (CT) scan. Thermography and acoustic emission are used in real-time monitoring techniques during the test. On the other hand, NDT observation of tomography is used for a post-failure analysis. In order to achive this, continuous glass fiber composite (GFRP) and discontinuous carbon fiber composite (DCFC) have been used as the test specimens which supplied by PSA Company, France. A series of mechanical testing was carried out to determine the damage behaviour under static and fatigue loading. During all the mechanical testing, thermography was used in real-time observation to follow the temperature change on specimen surface and supported by acoustic emission in certain condition. This study used rectangular shape and consist of specimen with and without circular notches (hole) at the center. The constant displacement rate is applied to observe the effect on damage behaviour under tensile static loading. Under fatigue testing, the constant parameter of frequency and amplitude of stress was explored for each load level to have the fatigue properties and damage evolution of specimen. The tomography was used to confirm the appearance of damage and material condition after fatigue testing. The analysis from the experiment results and NDT observation shown the good agreement between mechnical results and NDT thermography with supported by acoustic emission observation in detect the appearance and propagation of damage for GFRP and DCFC under static loading. Fatigue testing shows that thermal dissipation is related to the damage evolution and also thermography and can be successfully used to determine high cycle fatigue strength (HCFS) and S-N curve of fiber composite material. From post failure analysis, CT scan analysis successfully measured and evaluated damage and material condition after fatigue test for fiber composite material. v
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ZHOU, GING-XIN, and 周慶馨. "Error-bounding domain testing method." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/51379164365320726332.
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Te-Hsiang, Jen, and 任德祥. "Radio Frequency Transceiver Testing Method." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/01051861344108920717.
Full textAbstract:
碩士國立高雄應用科技大學
電子與資訊工程研究所碩士班
95
As the complexity of integrated Radio frequency circuits has growth, the complexity of testing theme has also growth. For some devices, the largest portion of manufacturing cost is testing. To perform such complex testing, Automated test Equipment (ATE) and test method is used. Another one of the challenges in the RF IC testing is that modern digital communications systems has brought to radio frequency engineering needs for end-to-end performance measurements is EVM (Error Vector Magnitude) and BER (Bit Error Rate) testing. EVM and BER provide a single figure of merit that summarizes a device performance under real life conditions. In the traditional EVM testing it’s only works in the IC design house - LAB solution. Tester is limited in the test instrument performance and EVM result in a degradation of about 5% to 20% EVM error. We Described the EVM theoretical method to calculate the EVM performance on the digital communication system to make it can production in ATE and EVM error between 2%. An example of 802.11b system measurement was described in the paper. BER (Bit Error Rate), which quantifies the reliability of the entire radio system from bit in to bit out, including the electronics, antennas and signal path in between. An example of this is a single RF front-end bluetooth chip was present here and integrate the base band circuit in the probe-card with FPGA circuit. We describe the theoretical method to calculate bit error rate (BER) performance of a GFSK system. The receiver tests consist of a series of bit error rate (BER) tests done at different carrier frequencies and power levels.
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Stripling, Hayes Franklin. "The Method of Manufactured Universes for Testing Uncertainty Quantification Methods." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8986.
Full textAbstract:
The Method of Manufactured Universes is presented as a validation framework for
uncertainty quantification (UQ) methodologies and as a tool for exploring the effects
of statistical and modeling assumptions embedded in these methods. The framework
calls for a manufactured reality from which "experimental" data are created (possibly with experimental error), an imperfect model (with uncertain inputs) from which
simulation results are created (possibly with numerical error), the application of a
system for quantifying uncertainties in model predictions, and an assessment of how
accurately those uncertainties are quantified. The application presented for this research manufactures a particle-transport "universe," models it using diffusion theory
with uncertain material parameters, and applies both Gaussian process and Bayesian
MARS algorithms to make quantitative predictions about new "experiments" within
the manufactured reality. To test further the responses of these UQ methods, we
conduct exercises with "experimental" replicates, "measurement" error, and choices
of physical inputs that reduce the accuracy of the diffusion model's approximation
of our manufactured laws.
Our first application of MMU was rich in areas for exploration and highly informative. In the case of the Gaussian process code, we found that the fundamental
statistical formulation was not appropriate for our functional data, but that the code
allows a knowledgable user to vary parameters within this formulation to tailor its
behavior for a specific problem. The Bayesian MARS formulation was a more natural emulator given our manufactured laws, and we used the MMU framework to develop
further a calibration method and to characterize the diffusion model discrepancy.
Overall, we conclude that an MMU exercise with a properly designed universe (that
is, one that is an adequate representation of some real-world problem) will provide
the modeler with an added understanding of the interaction between a given UQ
method and his/her more complex problem of interest. The modeler can then apply
this added understanding and make more informed predictive statements.
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"Testing and the method of sieves." Sloan School of Management, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/2721.
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Chiu, Chen-Hsing, and 邱振興. "A New Testing Method for LCM." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/95014445623160654421.
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碩士逢甲大學
電子工程所
94
A new system of Failure Analysis for TFT-LCD module is presented. This system is suitable to two package types (TCP and COF) of TFT-LCD source-driver and gate-driver. This system consists of high success rate (~95%) de-capsulate technique, new sockets between device and tester probe, and powerful inspection testing patterns. These new techniques are useful to other FA tools such as internal probing on tester. Besides, these new techniques are also presented which make TFT-LCD driver IC and Timing Controller analysis more effective. For TFT-LCD module analysis with this system, FA success rate is prompt and FA cycle time shorted successfully and effectively.
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Chen, Po-Kai, and 陳柏凱. "An Automated Method for Resource Testing." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/55367115624438864246.
Full textAbstract:
碩士國立中山大學
資訊管理學系研究所
94
This thesis introduces a method that combines automated test data generation techniques with high volume testing and resource monitoring. High volume testing repeats test cases many times, simulating extended execution intervals. These testing techniques have been found useful for uncovering errors resulting from component coordination problems, as well as system resource consumption (e.g. memory leaks) or corruption. Coupling automated test data generation with high volume testing and resource monitoring could make this approach more scalable and effective in the field.
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Tsou, Jui-yin, and 鄒瑞穎. "A new method for testing symmetry." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/94151270981937012082.
Full textAbstract:
碩士淡江大學
數學學系
92
Two of the most popular nonparametric methods for testing symmetry are the sign test ( Hettmansperger,1984 ) and Wilcoxon signed rank test ( Wilcoxon,1945 ). Recently, many scholars have proposed new tests for this problem. For example, McWilliams ( 1990 ) presented a test statistic R* based on a run statistic. Modarres and Gastwirth ( 1996 ) presented a test statistic Mp by using Wilcoxon scores to weight the runs. Chun-ta Li and Wei-hou Cheng ( 1999 ) presented a new test statistic Ck which is very easy to apply. Most of these papers focused on the case of a known center. In this paper, we consider the situation when the center is unknown. The basic idea is to estimate the center by using sample median, and construct a test statistic like the test statistic Ck . We first use Monte Carlo simulation to find the critical point. After some comparisons of power, we found k=6 to be a good choice. Then we compare the power of our test statistic C6* with the test statistic C6 using distributions belonging to the generalized lambda family. We found that our test statistic C6* performs reasonably well.
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Hsu, Kao-Yu, and 許高毓. "Microstructures Stiction Testing Using Light Diffraction Method." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/78142251780044219241.
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Chen, YuChuan, and 陳宥全. "Study of concurrent JAVA program testing method." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/89079863067048450288.
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碩士長庚大學
資訊工程研究所
92
The Java language is a concurrent object-oriented programming language and has been widely used in many application programs. Due to the non-deterministic execution behavior of Java programs, it is not easy to test a concurrent Java program completely. “Two-steps plus bottom-up concurrent Java program testing method”[2] is a structural testing method and can verify all execution behavior of a Java program. However, this method was brute-force approach to generate all concurrent paths of the tested concurrent Java program; hence the number of test cases generated is very huge. The purpose of this research is to find an effective concurrent path generation method so that number of test cases will be reduced. Analysis the execution behavior of concurrent paths, we found that if the expanded paths of two different Thread object’s run() methods of a concurrent path do not access the same shared object, the execution behavior of these two expanded paths are independent, and the execution behavior of two expanded paths will only affect that of the main() method’s con-expanded path of the concurrent path. When a con-expanded path of main() starts two or more Thread object’s run() methods and these run() methods have two or more independent expanded paths, if these independent expanded paths can be started and executed correctly, then all concurrent paths composed of these independent expanded path will be execution correctly too. Based on this concept, a new concurrent path generation method is proposed. An example is used to illustrate the detail of the proposed method. The number of concurrent paths generated by the proposed method is much low than generated by “the Two steps plus bottom-up concurrent Java testing method”.
47
Hsu, Ling-hsin, and 許令信. "An Ingetrated Method for Model-Based Testing." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/68y3wp.
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碩士國立中山大學
資訊管理學系研究所
96
The main goal of testing is to find errors in the System Under Test (SUT). Prior research indicated that Model-Based Testing is indeed good at finding SUT errors, can lead to less time and effort spent on testing if the time needed to write and maintain the model plus the time spent on directing the test generation is less than the cost of manually designing and maintaining a test suite. This study proposed a methodology for Model-Based Testing. In this approach, Sequence Diagrams and Class Diagram are used to determine the testing path and test case and Object Constraint Language is used to specify the business logic constraint. Three real-world cases and a CASE tool are used to test the usability (including the concepts, application, and advantages) of the proposed methodology. With this approach, SUT errors can be found at the systems analysis and design stage and thereby reduce the cost of software testing and enhance the efficiency of system development.
48
Chang, Sheng, and 張琞. "Research of Vapor Chamber Performance Testing Method." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/13127599952926528337.
Full textAbstract:
碩士國立中央大學
機械工程學系
104
For each company have different vapor chamber performance testing method. So they can not compare the vapor chamber performance that made by different company. That was why the market is flooded with cheap-jack vapor chamber. If we can establish the standard vapor chamber testing method. Then we can solve this problem. Accordingly, this research uses two kind of different size vapor chamber(100mmX100mmX3mm and 90mmX90mmX3mm) to do the experimental. And this study uses the water cooling system to test the vapor chamber performance. We design the five cold plates that have different hole size.(no hole, diameter 5mm hole, diameter 10mm hole, 30mmX30mm square hole, 60mmX60mm square hole) then we use these cold plates to test the vapor chamber. In the result show that larger hole size will increase the axial thermal resistance and spreading thermal resistance. When the hole size reach to certain size, the axial thermal resistance will decrease. Because of the larger hole will decrease the heat transfer area. Let the total thermal resistance increase. So the axial thermal resistance will increases. In this research. The diameter 10mm hole is best one to measure the vapor chamber performance.
49
Kuo, Hung-Chun, and 郭宏俊. "Fast method for Wafer Sort Sample Testing." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/00471016038294765462.
Full textAbstract:
碩士國立高雄第一科技大學
電腦與通訊工程所
95
In nowadays vertically linkup and solution integrated semiconductor industry field, any relative process procedure correlates with product itself closely. Wafer sort test is one of the important links to reduce the failure rate in assembly and to improve the product yield. Due to the fact that the increasing cost in wafer sort has a direct connection with test time, how to reduce that has become a valuable topic to study. If there is a way to use sampling wafer sort test instead of 100% testing, that should be able to decrease the overall test time effectively and also lower the cost. In this disquisition offering a method to stack the wafer map and to analyze the reject dice in the specific area, then based on the history of that product yield, to predict the sample test area on that wafer. In the meantime, we also performed variety of different sampling methods to do cross evaluation to estimate the benefit spending and the additional assembly cost. In addition, we evaluate the ability of the different sample sort test and see if the real low yield wafers could be detected or misjudged. Even though this is just sample wafer test, we still expect to effectively monitor the process of the wafer fabrication. According to the simulation result, the best test time is 9.8678% and the extra cost is 5.1306%. In another word, just spending about 10% of the original test time we can get approximate 5% extra cost in return.
50
Li, Shin-Lung, and 李欣隆. "Testing and Applications of Bonding Density Analysis Method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/48557667135628974880.
Full textAbstract:
碩士淡江大學
物理學系碩士班
100
The work of this thesis is consist of testing, reporting and help debugging the preliminary implementation of Bonding Density Analysis Tool code that was developed in our research group. In the Tool, Bonding Density Analysis method is used to analyse wavefunctions of molecules and crystals to get chemical bond characteristics, and show the density subsystems in 3D space. From usual total valence electron distribution, one can decompose it into sigma, pi, delta types bonding, anti-bonding and non-bonding electrons densities. If all added back, they will reproduce the original total electron distribution. The tests be conducted in this thesis include atom-domain partitioning, bond-domain partitioning, we also check atomic orbitals and final bonding density results. We confirm that we could always extract bonding and anti-bonding contribution from total electron density unambiguously. Based on our test results, this Analysis Tool is working, when applied on small molecules it can produce results that is in consistence with chemical intuition. Some problems due to inefficient memory allocation were also found and details forwarded to developers of the Tool. I also found a bug in the code related to the handling of crystal unit cell boundary, now the tracing of the source of error has begun, a fix should be available soon.