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Thèses sur le sujet « Lifetime distributions »

Auteur : Grafiati

Publié le 3 juin 2025

Mis à jour le 31 juillet 2025

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1

PAIXÃO, Ana Carla Percontini da. "New Extended Lifetime Distributions." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/12240.

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Submitted by Etelvina Domingos (etelvina.domingos@ufpe.br) on 2015-03-12T18:21:25Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) TESE Ana Carla Percontini da Paixão.pdf: 2309750 bytes, checksum: 1f4caced5454dee673c1e41705168ad0 (MD5)<br>Made available in DSpace on 2015-03-12T18:21:26Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) TESE Ana Carla Percontini da Paixão.pdf: 2309750 bytes, checksum: 1f4caced5454dee673c1e41705168ad0 (MD5) Previous issue date: 2014<br>Este trabalho está di

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TABLADA, Claudio Javier. "Generalized probability distributions for lifetime applications." Universidade Federal de Pernambuco, 2017. https://repositorio.ufpe.br/handle/123456789/23660.

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Submitted by Rafael Santana (rafael.silvasantana@ufpe.br) on 2018-02-16T19:58:08Z No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Tese_cd.pdf: 1772542 bytes, checksum: 9852fe90d8b009ad3e0db02dbf491d37 (MD5)<br>Made available in DSpace on 2018-02-16T19:58:08Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Tese_cd.pdf: 1772542 bytes, checksum: 9852fe90d8b009ad3e0db02dbf491d37 (MD5) Previous issue date: 2017-01-23<br>CAPES<br>A arte da indução paramétrica a uma distribuição-base é um dos mé

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Gomes, Antonio Eduardo. "Lifetime and disease onset distributions from incomplete observations /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/8972.

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Han, Yi Carpenter Mark. "Location-scale bivariate Weibull distributions for bivariate lifetime modeling." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2006%20Spring/master's/HAN_YI_21.pdf.

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DIAS, Cícero Rafael Barros. "New continuous distributions applied to lifetime data and survival analysis." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/17307.

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Submitted by Isaac Francisco de Souza Dias (isaac.souzadias@ufpe.br) on 2016-07-08T19:03:53Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese_CiceroDias_VersaoCD.pdf: 1665746 bytes, checksum: bf5520194ce2f18a505403954f133c62 (MD5)<br>Made available in DSpace on 2016-07-08T19:03:53Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese_CiceroDias_VersaoCD.pdf: 1665746 bytes, checksum: bf5520194ce2f18a505403954f133c62 (MD5) Previous issue date: 2016-02-23<br>Statistical analysis of lif

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Al-Malki, Saad Jamaan. "Statistical analysis of lifetime data using new modified Weibull distributions." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/statistical-analysis-of-lifetime-data-using-new-modified-weibull-distributions(0c8f3735-cc11-4189-b48e-99514c6110a2).html.

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The Weibull distribution is a popular and widely used distribution in reliability and in lifetime data analysis. Since 1958, the Weibull distribution has been modified by many researchers to allow for non-monotonic hazard functions. Many modifications of the Weibull distribution have achieved the above purpose. On the other hand, the number of parameters has increased, the forms of the survival and hazard functions have become more complicated and the estimation problems have risen. This thesis provides an extensive review of some discrete and continuous versions of the modifications of the We

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Verespej, Hakon Gabriel. "A characterization of node lifetime distributions in the PlanetLab test bed." Diss., [La Jolla] : University of California, San Diego, 2010. http://wwwlib.umi.com/cr/fullcit?p1477943.

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Thesis (M.S.)--University of California, San Diego, 2010.<br>Title from first page of PDF file (viewed July 12, 2010). Available via ProQuest Digital Dissertations. Includes bibliographical references (leaves 54-57).

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Li, Mengying. "New Bivariate Lifetime Distributions Based on Bath-Tub Shaped Failure Rate." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1583.

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A class of lifetime distributions which has received considerable attention in modelling and analysis of lifetime data is the class of lifetime distributions with bath-tub shaped failure rate functions because of their extensive applications. The purpose of this thesis was to introduce a new class of bivariate lifetime distributions with bath-tub shaped failure rates (BTFRFs). In this research, first we reviewed univariate lifetime distributions with bath-tub shaped failure rates, and several multivariate extensions of a univariate failure rate function. Then we introduced a new class of bivar

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GUERRA, Renata Rojas. "Some generalized Burr XII distributions with applications to income and lifetime data." Universidade Federal de Pernambuco, 2017. https://repositorio.ufpe.br/handle/123456789/25301.

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Submitted by Pedro Barros (pedro.silvabarros@ufpe.br) on 2018-07-30T20:16:30Z No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) TESE Renata Rojas Guerra.pdf: 1885947 bytes, checksum: f3735652f8d33d6ded71b89129232867 (MD5)<br>Approved for entry into archive by Alice Araujo (alice.caraujo@ufpe.br) on 2018-07-31T22:07:24Z (GMT) No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) TESE Renata Rojas Guerra.pdf: 1885947 bytes, checksum: f3735652f8d33d6ded71b89129232867 (MD5)<br>Made available in DSpace on 2018-07-31

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Bekker, Leonid. "Association between mean residual life (MRL) and failure rate functions for continuous and discrete lifetime distributions." FIU Digital Commons, 2002. http://digitalcommons.fiu.edu/etd/1479.

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The purpose of this study was to correct some mistakes in the literature and derive a necessary and sufficient condition for the MRL to follow the roller-coaster pattern of the corresponding failure rate function. It was also desired to find the conditions under which the discrete failure rate function has an upside-down bathtub shape if corresponding MRL function has a bathtub shape. The study showed that if discrete MRL has a bathtub shape, then under some conditions the corresponding failure rate function has an upside-down bathtub shape. Also the study corrected some mistakes in proofs of

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Jiang, Siyuan. "Mixed Weibull distributions in reliability engineering: Statistical models for the lifetime of units with multiple modes of failure." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185481.

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The finite mixed Weibull distribution is an appropriate distribution in modeling the lifetime of the units having more than one possible failure cause. Due to the lack of a systematic statistical procedure of fitting the distribution to a data set, it has not been widely used in lifetime data analyses. Many areas on this subject have been studied in this research. The following are the findings and contributions. Through a change of variable, 5 parameters in a two Weibull mixture can be reduced to 3. A parameter'vector (p₁, η, β) defines a family of two-Weibull mixtures which have common chara

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Olteanu, Denisa Anca. "Cumulative Sum Control Charts for Censored Reliability Data." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/26665.

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Companies routinely perform life tests for their products. Typically, these tests involve running a set of products until the units fail. Most often, the data are censored according to different censoring schemes, depending on the particulars of the test. On occasion, tests are stopped at a predetermined time and the units that are yet to fail are suspended. In other instances, the data are collected through periodic inspection and only upper and lower bounds on the lifetimes are recorded. Reliability professionals use a number of non-normal distributions to model the resulting lifetime data w

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潘成達 and Shing-Tat Poon. "Measuring the degree of dependence of lifetimes in some bivariate survival distributions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31977443.

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Poon, Shing-Tat. "Measuring the degree of dependence of lifetimes in some bivariate survival distributions." [Hong Kong] : University of Hong Kong, 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13787421.

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Shek, Yiu-fai, and 石耀輝. "Electric field distribution in metal/semi-insulating GaAs contacts investigated by positron lifetime technique." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31221579.

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Harding, Ann. "Lifetime income distribution and redistribution in Australia : applications of a dynamic cohort microsimulation model." Thesis, London School of Economics and Political Science (University of London), 1991. http://etheses.lse.ac.uk/1164/.

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The first part of the thesis describes the construction of Australia's first dynamic cohort microsimulation model. The model consists of a pseudo-cohort of 4000 males and females, who are aged from birth to death, with the processes of mortality, education, marriage, divorce, fertility, labour force participation, the receipt of earnings and other income, the receipt of social security and education transfers and the payment of income tax being simulated for every individual in the model for every year of life. The second part of the thesis describes some of the results which can be derived fr

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Liu, Xi. "Bayesian Designing and Analysis of Simple Step-Stress Accelerated Life Test with Weibull Lifetime Distribution." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1283365980.

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Phillips, David J. "Transport Imaging of Spatial Distribution of Mobility- Lifetime () Product in Bulk Semiconductors for Nuclear Radiation Detection." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/7401.

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The objective of this research is to advance the development of a micro-analysis technique for characterizing the charge transport properties in bulk semiconductor materials for room temperature nuclear radiation detection. The technique is applied to bulk semi-insulating thallium bromide (TlBr) and cadmium zinc telluride (CZT) and uses a two-dimensional diffusion model and transport imaging to make rapid contact-free measurements of the magnitude and spatial variation in the mobility-lifetime () product at 2 m resolution. The product is a key measure of charge transport, and a uniform product

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Westerlund, Per. "Condition measuring and lifetime modelling of disconnectors, circuit breakers and other electrical power transmission equipment." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214984.

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The supply of electricity is important in modern society, so the outages of the electric grid should be few and short, especially for the transmission grid. A summary of the history of the Swedish electrical system is presented. The objective is to be able to plan the maintenance better by following the condition of the equipment. The risk matrix can be used to choose which component to be maintained. The risk matrix is improved by adding a dimension, the uncertainty of the probability. The risk can be reduced along any dimension: better measurements, preventive maintenance or more redundancy.

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Pumpiched, Patchara. "Sequential estimation of optimal age replacement policies when distribution of lifetimes is phase type." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/24033.

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Dehghan, Mohammad Hossein. "Nonparametric methods for the estimation of the conditional distribution of an interval-censored lifetime given continuous covariates." Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/29471/29471.pdf.

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Hatta, Sharifah Fatmadiana Wan Muhamad. "Probing technique for energy distribution of positive charges in gate dielectrics and its application to lifetime prediction." Thesis, Liverpool John Moores University, 2013. http://researchonline.ljmu.ac.uk/4528/.

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The continuous reduction of the dimensions of CMOS devices has increased the negative bias temperature instability (NBTI) of pMOSFETs to such a level that it is limiting their lifetime. This increase of NBTI is caused mainly by three factors: an increase of nitrogen concentration in gate dielectric, a higher operation electrical field, and a higher temperature. Despite of many years’ research work, there are questions on the correctness of the NBTI lifetime predicted through voltage acceleration and extrapolation. The conventional lifetime prediction technique measures the degradation slowly a

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Kensler, Jennifer Lin Karam. "Analysis of Reliability Experiments with Random Blocks and Subsampling." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28415.

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Reliability experiments provide important information regarding the life of a product, including how various factors may affect product life. Current analyses of reliability data usually assume a completely randomized design. However, reliability experiments frequently contain subsampling which is a restriction on randomization. A typical experiment involves applying treatments to test stands, with several items placed on each test stand. In addition, raw materials used in experiments are often produced in batches. In some cases one batch may not be large enough to provide materials for the en

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Rong, Du. "Wireless Sensor Networks in Smart Cities : The Monitoring of Water Distribution Networks Case." Licentiate thesis, KTH, Reglerteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185453.

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The development of wireless sensor networks (WSNs) is making it possible to monitor our cities. Due to the small size of the sensor nodes, and their capabilities of transmitting data remotely, they can be deployed at locations that are not easy or impossible to access, such as the pipelines of water distribution networks (WDNs), which plays an important role in protecting environment and securing public health. The design of WSNs for WDNs faces major challenges. Generally, WSNs are resource-limited because most of the sensor nodes are battery powered. Thus, their resource allocation has to b

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Mowat, Christopher. "Star formation in the Gould Belt : a submillimetre perspective." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34652.

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This thesis presents my work characterising star formation in Gould Belt molecular clouds using submillimetre observations from SCUBA-2 on the James Clerk Maxwell Telescope (JCMT). I use these observations alongside data from previously published surveys using instruments including the Spitzer Space Telescope. I investigate the effect of including submillimetre data on the numbers, classifications and lifetimes of Young Stellar Objects (YSOs) in Gould Belt molecular clouds, particularly protostars. Following a literature review, I use SCUBA-2 450 and 850 μm observations to characterise star fo

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Freeman, Laura J. "Statistical Methods for Reliability Data from Designed Experiments." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/37729.

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Product reliability is an important characteristic for all manufacturers, engineers and consumers. Industrial statisticians have been planning experiments for years to improve product quality and reliability. However, rarely do experts in the field of reliability have expertise in design of experiments (DOE) and the implications that experimental protocol have on data analysis. Additionally, statisticians who focus on DOE rarely work with reliability data. As a result, analysis methods for lifetime data for experimental designs that are more complex than a completely randomized design are extr

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Dickinson, Rebecca. "Statistical Methods for Improving and Maintaining Product Reliability." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/50516.

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When a reliability experiment is used, practitioners can understand better what lifetimes to expect of a product under different operating conditions and what factors are important to designing reliability into a product. Reliability experiments, however, can be very challenging to analyze because often the reliability or lifetime data tend to follow distinctly non-normal distributions and the experiments typically involve censoring. Time and cost constraints may also lead to reliability experiments with experimental protocols that are not completely randomized. In many industrial experiments,

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Li, Hailong. "Analytical Model for Energy Management in Wireless Sensor Networks." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1367936881.

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Botha, Marthinus Ignatius. "Modelling and simulation framework incorporating redundancy and failure probabilities for evaluation of a modular automated main distribution frame." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/33345.

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Maintaining and operating manual main distribution frames is labour-intensive. As a result, Automated Main Distribution Frames (AMDFs) have been developed to alleviate the task of maintaining subscriber loops. Commercial AMDFs are currently employed in telephone exchanges in some parts of the world. However, the most significant factors limiting their widespread adoption are costeffective scalability and reliability. Therefore, an impelling incentive is provided to create a simulation framework in order to explore typical implementations and scenarios. Such a framework will allow the eva

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Silver, David J. "Occupational exposure to ultrafine particles and polycyclic aromatic hydrocarbons from candle emissions." [Tampa, Fla] : University of South Florida, 2005. http://purl.fcla.edu/usf/dc/et/SFE0001426.

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Eusébio, Frederica Gonçalves. "Validação do processo de confeção e do período de vida útil de camarão cozido num estabelecimento de venda a retalho." Master's thesis, Universidade Técnica de Lisboa. Faculdade de Medicina Veterinária, 2013. http://hdl.handle.net/10400.5/5980.

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Dissertação de Mestrado Integrado em Medicina Veterinária<br>Ao longo dos últimos anos, tem-se verificado um interesse crescente pelos conceitos de Qualidade Alimentar e Segurança Alimentar, os quais se tornam parte integrante do vocabulário e conhecimento do consumidor. Com a alteração dos seus hábitos alimentares, o consumidor passa a procurar os estabelecimentos de venda que garantem a confiança nos seus produtos como resultado da otimização da sua confeção. Surge a vontade de conhecer a origem de cada alimento, tal como o controlo aplicado durante o seu percurso até às áreas de grande con

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Ben, Ammar Amira. "Approche cross-layer pour la minimisation d’énergie dans les réseaux de capteurs sans fil." Thesis, Paris, CNAM, 2018. http://www.theses.fr/2018CNAM1191/document.

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Les réseaux de capteurs sans fil (RCSF) sont des réseaux ad hoc généralement constitués d’entités autonomes miniaturisées appelés noeuds capteurs pouvant communiquer entre eux par liaison radio. Les RCSF ont suscité beaucoup d’engouement dans la recherche scientifique en raison notamment des nouveaux problèmes de routage sous forte contrainte de durée de vie du réseau et de faibles capacités des noeuds.Ce type de réseau diffère des réseaux filaires par ses caractéristiques et limitations qui ont motivé le développement d’une nouvelle approche de conception cross-layer ignorant certains paradig

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Lemonte, Artur Jose. "Estatística gradiente e refinamento de métodos assintóticos no modelo de regressão Birnbaum-Saunders." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-26102010-123617/.

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Rieck & Nedelman (1991) propuseram um modelo de regressão log-linear tendo como base a distribuição Birnbaum-Saunders (Birnbaum & Saunders, 1969a). O modelo proposto pelos autores vem sendo bastante explorado e tem se mostrado uma ótima alternativa a outros modelos propostos na literatura, como por exemplo, os modelos de regressão Weibull, gama e lognormal. No entanto, até o presente momento, não existe nenhum estudo tratando de refinamentos para as estatísticas da razão de verossimilhanças e escore nesta classe de modelos de regressão. Assim, um dos objetivos desta tese é obter um fator de

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Randriatsiferana, Rivo Sitraka A. "Optimisation énergétique des protocoles de communication des réseaux de capteurs sans fil." Thesis, La Réunion, 2014. http://www.theses.fr/2014LARE0019/document.

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Pour augmenter la durée de vie des réseaux de capteurs sans fil, une solution est d'améliorer l'efficacité énergétique des protocoles de communication. Le regroupement des nœuds du réseau de capteurs sans fil en cluster est l'une des meilleures méthodes. Cette thèse présente propose plusieurs améliorations en modifiant les paramètres du protocole de référence LEACH. Pour améliorer la distribution énergétique des "cluster-heads", nous proposons deux protocoles de clustering centralisés k-LEACH et sa version optimisée k-LEACH-VAR. Un algorithme distribué, appelé e-LEACH, est également proposé po

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Benitah, Hervé. "Bivariate lifetime distributions." Thesis, 1994. http://spectrum.library.concordia.ca/6156/1/MM01379.pdf.

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Chuang, Hsiang-yu, and 莊翔宇. "Accelerated Failure Tests of Electro-Explosive Devices Under Weibull Lifetime Distributions." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/00442553921913669891.

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碩士<br>國立中央大學<br>統計研究所<br>99<br>Due to the high reliability and high testing cost of electro-explosive devices, we consider an accelerated failure experiment in which the lifetime following a Weibull distribution with scale parameter being related to the accelerated variable. We use the maximum likelihood and Bayesian approaches to develop statistical inference on the mean-time-to-failure (MTTF) and reliability under normal condition. In the Bayesian approach, we convert the prior information from the success probability to the prior distribution of the underlying parameters and use the mome

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Liu, Chih-Chuan, and 劉智銓. "Investigation of TDDB Lifetime Extraction with Weibull and Log-normal Probability Distributions." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/37043014445063016261.

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碩士<br>明新科技大學<br>電子工程研究所<br>94<br>Device reliability tests are always some of process evaluation tools. Gate oxide reliability test is the most obvious to verify the transistor performance. In the gate oxide lifetime test, the time-dependent dielectric breakdown (TDDB) lifetime test is commonly applied. As the advanced process is developed, the uniformity of gate oxide can not be well controlled at this moment, especially the oxide thickness, Tox<50Å or below. Due to the process variation, the oxide integrity shows the bad performance. While the TDDB test is employed, people can adopt the Weibu

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Maiti, Kousik. "Statistical Inference Based on Progressive type-II Censored Samples from Lifetime Distributions." Thesis, 2022. http://ethesis.nitrkl.ac.in/10352/1/2022_PhD_KMaiti_516MA1007_Statistical.pdf.

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The problems of estimation and prediction for statistical models based on progressively type-II censored sample play a crucial role in various areas of research such as reliability theory, survival analysis and statistics. In this thesis, statistical inferences for five distributions are considered under progressively type-II censored sample. For generalized Rayleigh, gamma-mixed Rayleigh, log-logistic and generalized Fréchet distributions, the estimators have been obtained for the unknown parameters, reliability and hazard rate functions. For the case of exponentiated Gumbel type-II distribut

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HUNG, YANG CHIEN, and 楊健宏. "The Reliability Analysis of Masked Data When Lifetime of Components Follow Gamma Distributions." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/09126836790322590763.

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碩士<br>元智大學<br>工業工程研究所<br>89<br>High quality and multi-functionality products are designed to meet people’s needs recently. High reliability is one index to measure the quality of products. Traditionally, the concept of high reliability is achieved by well-control the manufacturing process and sampling examination. In Contrast to the traditional methods, controlling the quality from the designing stage is more reliable method nowadays. Therefore, determination of design parameters plays an important rule in the system engineering. In other hand, making good estimation of design parameters is ve

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Su, Ying-Yi, and 蘇瓔漪. "Constant Stress Accelerated Life Tests forDestructive Device of Series Components under Weibull Lifetime Distributions." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/05729099042206745015.

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碩士<br>國立中央大學<br>統計研究所<br>100<br>In this thesis, we consider modeling the constant stress accelerated life test of a series system with independent Weibull lifetime components whose scale parameters are log-linear in the levels of the stress variable. We first consider a three-component series system where the system lifetime is collected under Type I censoring but the component that causes the system to fail may or may not be observed. The data are so called masked for the latter case. We then extend the model to the destructive (also called by one-shot) device of series components where each

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Chen, Yi-chun, and 陳奕君. "Accelerated Life Tests of Series System with Masked Data Under Generalized Gamma Lifetime Distributions." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/03699699964021807781.

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碩士<br>國立中央大學<br>統計研究所<br>99<br>In this thesis, we consider masked lifetime data with different distributions under Type-I censoring scheme. For generalized gamma lifetime distribution, we discuss the constant stress accelerated life testing in which the location parameters of the generalized gamma lifetime distributions of the components is of a linear relationship with the stress variables.For exponential lifetime distribution, we discuss the step-stress accelerated life testing in which the mean life time of each component is a log-linear function of the levels of the stress variables. We ut

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Hsu, Tsung-Ming, and 許琮明. "Accelerated Life Tests of a Series System with Masked Interval Data Under Exponential Lifetime Distributions." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/24428434414768060510.

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碩士<br>國立中央大學<br>統計研究所<br>98<br>In this thesis, we consider a system of independent and non-identical components connected in series, each component having a Exponential life time distribution under Type-I group censored. In a series system, the system fails if any of the components fails, and it may only be ascertained that the cause of system failure is due to one of the components in some subset of system components, so called masked data. We discuss the step-stress accelerated life testing in which the mean life time of each component is a log-linear function of the levels of the stress var

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Chan, Hsiang-Hao, and 詹翔豪. "Step-Stress Accelerated Life Tests of Series Systems with Interval Data Under Exponential Lifetime Distributions." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/78997803927014708140.

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碩士<br>國立中央大學<br>統計研究所<br>102<br>High reliability products have longer lifetime under normal environment. Accelerated life tests are usually used to reduce the experiment time. In a series system, the system fails when any of the components fails, while the cause of system failure may not be observed which is known as masked data. In this thesis, we consider the step-stress accelerated life tests for series systems with Type-I censoring, in which the lifetimes of components are exponentially distributed. We not only consider those distributions are independent, but also consider the Marshall-Ol

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Hsu, Tzu-Chun, and 徐子淳. "Comparisons of Individual and Group Replacement Policies for Two-Component Systems with Weibull Lifetime Distributions." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/ns4566.

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碩士<br>國立臺灣科技大學<br>工業管理系<br>104<br>This paper investigates the comparisons of optimal replacement policies for two-component repairable systems with Weibull lifetime distributions and analyzes the influence of the related downtime cost for individual and group replacement policies under series and parallel systems. The system consists of two components by series and parallel. When any component fails in the operation time, the failed component is rectified by a minimal repair. Due to the inevitable deterioration of the component, it may fail more frequently as its age increases. To minimize the

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Khan, Muhammad Shuaib. "Transmuted families of lifetime distributions with mixture and covariates regression modelling to analyse survival data." Thesis, 2017. http://hdl.handle.net/1959.13/1347457.

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Research Doctorate - Doctor of Philosophy (PhD)<br>This thesis develops and presents new families of transmuted lifetime distributions with covariates regression modelling for reliability and life-testing experiments. The main idea of this thesis is the quadratic rank transmutation map (QRTM) technique, used to generate a new flexible family of lifetime distributions. Chapter 1, describes the different generalised families of lifetime distributions used in this thesis. It also outlines the general framework of transmuted distributions, and provides a review of the current literature on related

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Hong, Cheng-Hong, and 洪承弘. "Assessing the lifetime performance indices of products with Gompertz and Burr X distributions under censored samples." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/65805694601733161509.

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碩士<br>淡江大學<br>統計學系碩士班<br>100<br>Process capability indices (PCIs) have been widely used in quality monitoring by many manufacturing industries. Most PCIs assume that quality characteristic has a normal distribution. However, the lifetime of many products frequently possesses non-normal distribution. In practice, the lifetime performance index C_L is utilized to measure lifetime performance for products, where L is the lower specification limit. In lifetime testing experiments, we may not be able to obtain a complete sample due to time limitation or other restrictions. Therefore, censored sampl

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Chang, Chia-hua, and 張家華. "The Reliability Analysis of Step-Stress Accelerated Life Tests Under Generalized Gamma Lifetime Distributions With Type-II Censoring." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/02860347123830041823.

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碩士<br>國立中央大學<br>統計研究所<br>100<br>High reliability products through strictly controlled in the manufacturing process, so their lifetimes are longer under normal environment. Accelerated life test is often useful to observe enough lifetime information of the products. In this thesis, we discuss the step-stress accelerated life testing for the products whose lifetimes are of generalized gamma distribution in which the mean lifetime of each component is a log-linear function of the levels of the stress variables under Type-II censoring scheme with cumulative exposure model. Maximum likelihood estim

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Pan, Pin-Yu, and 潘品豫. "Assessing the lifetime performance indices of products with Burr XII and Gompertz distributions based on the upper record values." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/43445015788703055668.

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碩士<br>淡江大學<br>統計學系碩士班<br>101<br>In recent years, many process capability indices (PCIs) have been widely used in quality monitoring by many manufacturing industries. The better process capability , the higher level of product quality it is, and the conforming rate. The literatures of quality performance mostly assumed the quality characteristics of product with the Normal distribution. In practice, the quality characteristics of product does not necessarily obey the Normal distribution. However, under certain situation, we are only interested in the next occurrence of the life of the product i

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Chen, Yi-Jie, and 陳宜潔. "Statistical inferences for the lifetime performance index of the products with the Rayleigh and Gompertz distributions under progressively type II censored samples." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/22277647994056701621.

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碩士<br>淡江大學<br>統計學系碩士班<br>98<br>In recent years, many process capability indices (PCIs) have been widely used in quality monitoring by many manufacturing industries. Most PCIs assume that the quality characteristic has a normal distribution. However, the lifetime of products frequently possesses an exponential distribution, a Pareto or Weibull distribution etc. In practice, the lifetime performance index is utilized to measure lifetime performance for products with some lifetime distributions, where is the lower specification limit. In lifetime testing experiments, we may not be able to obt

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Chang, I.-Jou, and 張逸柔. "Assessing the lifetime performance indices of products with the Burr XII and Extreme Value distributions based on doubly type II censored samples." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/33518545117871472939.

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碩士<br>淡江大學<br>統計學系碩士班<br>100<br>In recent years, many process capability indices (PCIs) have been widely used in qality monitoring by many manufacturing industries.In practice, the lifetime performance index CL is utilized to measure lifetime performance for products with some lifetime distributions, where L is the lower specification limit. In lifetime testing experiments, we may not be able to obtain a complete sample due to time limitation or other restrictions. Therefore, censored samples arise in practice. This research constructs an unbiased estimator of CL based on the doubly type

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