Bibliografie tematiche / 62D05

Letteratura scientifica selezionata sul tema "62D05"

Autore: Grafiati

Pubblicato: 1 giugno 2024

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Articoli di riviste sul tema "62D05":

Pratesi, M., S. Marchetti, C. Giusti e N. Salvati. "The Use of Spatial Information in Area-level Models: An Evaluation Based on Auxiliary Data Availability". Calcutta Statistical Association Bulletin 75, n. 2 (novembre 2023): 155–72. http://dx.doi.org/10.1177/00080683231198589.

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The small area estimation (SAE) theory is widely used when local or domain-specific reliable estimates based on survey data are needed. Small area model-based estimates use a model that links the response variable to some auxiliary information borrowing strength from the related areas. When geographical information on the areas of interest is available, the specification of a spatial area level model can increase the estimates’ efficiency, depending on available auxiliary data. In this article, we first review the most popular area level spatial models, and we then compare their performance under two alternative scenarios of auxiliary information availability to estimate the average equivalized household income in Italian Local Labour Market Areas (LLMAs) using the EU-SILC (European Union Statistics on Income and Living Conditions) survey data. Our findings suggest that the spatial information can “fill the gap” when the covariates do not have a high predictive power, a crucial result when there is lack of auxiliary data. AMS Subject Classification: 62D05, 62G05, 62H11

Singh, Sarjinder. "Estimation of Variance of Regression Estimator in two Phase Sampling". Calcutta Statistical Association Bulletin 50, n. 1-2 (marzo 2000): 49–64. http://dx.doi.org/10.1177/0008068320000105.

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In the present investigation, an improved strategy in two phase sampling for estimating the variance of the regression estimator has been developed. The proposed technique has been found to be more efficient than the strategy adopted by Hidiroglou and Sarndal (1995, 1998). The proposed strategy here is analogous to the higher order calibration approach proposed by Singh, Horn and Yu (1998). Many new estimators for estimating the variance of regression estimator have been studied theoretically as well as empirically. AMS (2000) Subject Classification: Primary 62D05; Secondary 62F10.

Pal, Sanghamitra. "Extending Takahasi‐Sakasegawa’s Indirect Response Technique to Cover Sensitive Surveys in Unequal Probability Sampling". Calcutta Statistical Association Bulletin 59, n. 3-4 (settembre 2007): 265–76. http://dx.doi.org/10.1177/0008068320070310.

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Abstract: Randomized Response (RR) Technique (RRT), introduced by Warner (1965), is a well‐known way to unbiasedly estimate proportions of people bearing sensitive characteristics. Takahasi and Sakasegawa (1977) narrated a novel procedure avoiding any particular RR device unlike most researchers in this field. Most RRT’s in the literature give estimators for population totals and variance estimators thereof, allowing exclusively simple random sampling with replacement (SRSWR) schemes, including as well the above too. We present formulae applicable to general varying probability sampling, even without replacement applying Takahasi‐ Sakasegawa device. AMS (2000) Subject Classification: 62D05.

Mukherjee, S. P. "Stratified Sampling: Some Associated Problems". Calcutta Statistical Association Bulletin 75, n. 1 (maggio 2023): 48–59. http://dx.doi.org/10.1177/00080683231178454.

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Stratified sampling has been commonly used in many large-scale surveys. The two inter-related problems of determining strata boundaries where strata have to be developed using some variable(s) whose values can be accessed while designing the survey and of allocating the total sample size among the strata have been studied during a long period, initially without involving mathematical programming and subsequently using concurrent developments in constrained optimization methods and algorithms. The present article provides a critique of some of these studies, especially those dealing with multiple stratification variables and multiple parameters to be estimated. AMS Subject Classification: 62D05

Saha, Amitava. "On the Application of the Mirror‐Match Bootstrap in Adaptive Cluster Sampling". Calcutta Statistical Association Bulletin 59, n. 3-4 (settembre 2007): 223–38. http://dx.doi.org/10.1177/0008068320070307.

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Abstract: The confidence intervals (CT’s) conventionally constructed in large‐scale sample surveys assuming asymptotic normality often leads to unsatisfactory results when the population under study is rare or clustered. Adaptive cluster sampling is a promising sampling technique to effectively catch rare, geographically clustered or localized population elements. Christman and Pontius (2000) applied several bootstrap techniques to construct confidence intervals when simple random samples are selected without replacement (SRSWOR) and adaptive cluster sampling is used to sample localized population units. Here we extend Sitter's (1992a, b) ‘mirror‐match’ (MM) bootstrap to a practical survey set‐up using varying selection probability. We also demonstrate using real data from the Indian Economic Census how the extended procedure can be applied to adaptive cluster sampling adopted for estimating simultaneously the numbers of carners engaged in a number of localized unorganized rural industries. AMS (2000) Subject Classification: 62D05.

Patra, Dipika, Sanghamitra Pal e Arijit Chaudhuri. "Respondent-specific randomized response technique to estimate sensitive proportion". Statistics in Transition new series 24, n. 4 (8 settembre 2023): 53–70. http://dx.doi.org/10.59170/stattrans-2023-051.

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In estimating the proportion of people bearing a stigmatizing characteristic in a community of people, randomized response techniques are plentifully available in the literature. They are implemented essentially using boxes of similar cards of two distinguishable types. In this paper, we propose a more general procedure using five different types of cards. A respondent-specific randomized response technique is also proposed, in which respondents are allowed to build up the boxes according to their own choices. An immediate objective for this change is to enhance, sense of protection of privacy of the respondents. But as by-products, higher efficiency in terms of actual coverage percentages of confidence intervals and related features are demonstrated by a simulation study, and superior jeopardy levels against divulgence of personal secrecy are also reported to be achievable. AMS subject classification: 62D05

Koshti, Rohan D., e Kirtee K. Kamalja. "Efficient Estimation of a Scale Parameter of Bivariate Lomax Distribution by Ranked Set Sampling". Calcutta Statistical Association Bulletin 73, n. 1 (11 aprile 2021): 24–44. http://dx.doi.org/10.1177/0008068321992520.

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Ranked set sampling (RSS) is an efficient technique for estimating parameters and is applicable whenever ranking on a set of sampling units can be done easily by a judgment method or based on an auxiliary variable. In this paper, we assume [Formula: see text]to have bivariate Lomax distribution where a study variable [Formula: see text]is difficult and/or expensive to measure and is correlated with an auxiliary variable [Formula: see text] which is readily measurable. The auxiliary variable is used to rank the sampling units. In this article, we propose an estimator for the scale parameter of bivariate Lomax distribution using some of the modified RSS schemes. Efficiency comparison of the proposed estimators is performed numerically as well as graphically. A simulation study is also performed to demonstrate the performance of the proposed estimators. Finally, we implement the results to real-life datasets. AMS classification codes: 62D05, 62F07, 62G30

Li, Fanjie, Xiaopeng Li e Dongyang Shang. "Dynamic Modeling and Vibration Characteristics Analysis of Deep-Groove Ball Bearing, Considering Sliding Effect". Mathematics 9, n. 19 (28 settembre 2021): 2408. http://dx.doi.org/10.3390/math9192408.

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To study the vibration characteristics of deep-groove ball bearing, considering the influence of sliding, the dynamic model of the DGB 6205 system is established in this paper. The DGB 6205 system model includes the movement of the bearing inner ring in the X and Y directions, the rotation of the cage, the rotation movement of each ball, the revolution movement of each ball and the movement along the radial direction of each ball. Based on the system model, the differential equations of motion of the system are established, and the correctness of the model is verified by experiment. The slip characteristics of the DGB 6205 system are studied by numerical simulation. At the same time, the influence of time-varying load on the vibration characteristics of the system is studied. Then, the sensitivity of system parameters is analyzed. The results show that the sliding speed between the ball and the inner raceway is greater than that between the ball and the outer raceway. The radial vibration response of DGB 6205 system under time-varying load is less than that under constant load. The increase of radial clearance will increase the vibration response of DGB 6205 system.

Gopan, Nandu, e Anandu Gopan. "Practice of Electrical Insulation of Lightning Protection Systems in India – Before and After the Publication of the National Building Code of India 2016". Amrit Research Journal 4, n. 2 (15 maggio 2024): 25–32. http://dx.doi.org/10.3126/arj.v4i2.65541.

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Lightning protection system (LPS) as per IS/IEC 62305 is mandatory in India for buildings above 15 meters and for special buildings like educational institutions, and hospitals regardless of their height. External LPS (ELPS) can be of isolated or non-isolated type depending upon the nature of the structure. This paper reviews the installation of ELPS before and after the publication of the National Building Code of India 2016 (NBC). This is limited only to ELPS and Internal Lightning protection system (ILPS) is not considered. The installation has been studied as per IS/IEC 62305 on electrical isolation. The conclusion has been drawn based on the installation and the influence of NBC 2016.

Markowska, Renata, e Zofia Wróbel. "Selected Issues of Safe Operation of the Railway Traffic Control System in the Event of Exposition to Damage Caused by Lightning Discharges". Energies 14, n. 18 (14 settembre 2021): 5808. http://dx.doi.org/10.3390/en14185808.

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Lightning discharge becomes a serious source of interference and damage for electronic and electrical power systems. Safe and reliable operation of railway traffic control systems requires proper protection against the effects of lightning. However, the current standards on lightning protection, PN-EN/EN/IEC 62305, do not cover railway objects. Moreover, there are no other standards or recommendations dedicated to the railway. The paper is an attempt to apply the procedure of lightning risk management according to PN-EN 62305-2 to select the proper protection measures in railway objects. A case study for the signal box with installed relaying and digital stations of the railway traffic control system is analyzed. The analysis comprises calculations based on the current standard PN-EN 62305-2:2012 but including the issues specific to railway traffic control. The risks of lightning losses have been calculated for two cases: without lightning protection measures and with protection measures proposed to decrease the risks below the tolerable values. The results show that a practically effective solution to reduce the risks is applying surge protective devices with proper characteristics. Another way is replacing unshielded incoming lines with shielded ones of given shield bonding way, and supplementing it with surge protective devices when necessary.

Più fonti

Tesi sul tema "62D05":

Karagulyan, Avetik. "Sampling with the Langevin Monte-Carlo". Electronic Thesis or Diss., Institut polytechnique de Paris, 2021. http://www.theses.fr/2021IPPAG002.

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L’échantillonnage des lois aléatoires est un problème de taille en statistique et en machine learning. Les approches générales sur ce sujet sont souvent divisées en deux catégories: fréquentiste vs bayésienne. L’approche fréquentiste corresponds à la minimisation du risque empirique, c’est à dire à l’estimation du maximum vraisemblance qui est un problème d’optimisation, tandis que l’approche bayésienne revient à intégrer la loi postérieure. Cette dernière approche nécessite souvent des méthodes approximatives car l’intégrale n’est généralement pas tractable. Dans ce manuscrit, nous allons étudier la méthode de Langevin, basée sur la discrétisation de l’EDS de Langevin. La première partie de l’introduction pose le cadre mathématique et l’intérêt d’étudier plus avant la question de l'échantillonnage. La suite de l’introduction s’attache à la présentation des méthodes d’échantillonnage.Le premier article concerne les bornes non-asymptotiques sur la convergence en distance de Wasserstein de Langevin Monte-Carlo pour les fonctions de potentiel lisses et fortement convexes. Nous établissons d’abord des bornes explicites pour LMC avec des step-sizes variantes?. Puis nous étudions la convergence pour des fonctions de potentiel avec des gradients stochastiques. Enfin, deux types de discrétisation sont présentés, pour les potentiels plus réguliers.Dans la deuxième article nous abordons le problème d’échantillonnage de loi log-concave (pas fortement) en utilisant LMC, KLMC et KLMC2. Nous proposons une pénalisation quadratique constante de la fonction de potentiel. Puis nous prouvons des bornes non-asymptotiques sur l’erreur de Wasserstein de ces méthodes pour le choix de pénalisation optimale. Enfin, nous soulignons l’importance du choix de l’échelle pour le mesurage des complexités des différentes méthodes.La troisième contribution principales est concentrée sur la convergence de la diffusion de Langevin dans le case log-concave. Une pénalisation variable dans le temps est proposée pour la fonction de potentiel. Nous prouvons des bornes explicites pour cette méthode nommée Penalized Langevin Dynamics. A la fin, le lien entre les algorithmes de Langevin et l’optimisation convexe est établi, ce qui nous permet de prouver des bornes similaires pour le gradient flow
Sampling from probability distributions is a problem of significant importance in Statistics and Machine Learning. The approaches for the latter can be roughly classified into two main categories, that is the frequentist and the Bayesian. The first is the MLE or ERM which boils down to optimization, while the other requires the integration of the posterior distribution. Approximate sampling methods are hence applied to estimate the integral. In this manuscript, we focus mainly on Langevin sampling which is based on discretizations of Langevin SDEs. The first half of the introductory part presents the general mathematical framework of statistics and optimization, while the rest aims at the historical background and mathematical development of sampling algorithms.The first main contribution provides non-asymptotic bounds on convergence LMC in Wasserstein error. We first prove the bounds for LMC with the time-varying step. Then we establish bounds in the case when the gradient is available with a noise. In the end, we study the convergence of two versions of discretization, when the Hessian of the potential is regular.In the second main contribution, we study the sampling from log-concave (non-strongly) distributions using LMC, KLMC, and KLMC with higher-order discretization. We propose a constant square penalty for the potential function. We then prove non-asymptotic bounds in Wasserstein distances and provide the optimal choice of the penalization parameter. In the end, we highlight the importance of scaling the error for different error measures.The third main contribution focuses on the convergence properties of convex Langevin diffusions. We propose to penalize the drift with a linear term that vanishes over time. Explicit bounds on the convergence error in Wasserstein distance are proposed for the PenalizedLangevin Dynamics and Penalized Kinetic Langevin Dynamics. Also, similar bounds are proved for the Gradient Flow of convex functions

Spławski, Piotr. "Japonisme in Polish pictorial arts (1885-1939)". Thesis, University of the Arts London, 2013. http://ualresearchonline.arts.ac.uk/6205/.

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This thesis chronicles the development of Polish Japonisme between 1885 and 1939. It focuses mainly on painting and graphic arts, and selected aspects of photography, design and architecture. Appropriation from Japanese sources triggered the articulation of new visual and conceptual languages which helped forge new art and art educational paradigms that would define the modern age. Starting with Polish fin-de-siècle Japonisme, it examines the role of Western European artistic centres, mainly Paris, in the initial dissemination of Japonisme in Poland, and considers the exceptional case of Julian Fałat, who had first-hand experience of Japan. The second phase of Polish Japonisme (1901-1918) was nourished on local, mostly Cracovian, infrastructure put in place by the ‘godfather’ of Polish Japonisme Feliks Manggha Jasieński. His pro-Japonisme agency is discussed at length. Considerable attention is given to the political incentive provided by the outbreak of the Russo-Japanese war in 1904, which rendered Japan as Poland’s ally against its Russian oppressor. The first two decades of the 20th century are regarded as the ‘Renaissance’ of Japonisme in Poland, and it is this part of the thesis that explores Japanese inspirations as manifested in the genres of portraiture, still life, landscape, representations of flora and fauna, erotic imagery, and caricature. Japonisme in graphic and applied graphic arts, including the poster, is also discussed. The existence of the taste for Japanese art in the West after 1918 is less readily acknowledged than that of the preceding decades. The third phase of Polish Japonisme (1919-1939) helps challenge the tacit conviction that Japanese art stopped functioning as an inspirational force around 1918. This part of the thesis examines the nationalisation of heretofore private resources of Japanese art in Cracow and Warsaw, and the inauguration of official cultural exchange between Poland and Japan. Polish Japonisme within École de Paris, both before 1918 and thereafter, inspired mainly by the painting of Foujita Tsuguharu, is an entirely new contribution to the field. Although Japanese inspirations frequently appeared in Polish painting of the interwar period, it was the graphic arts that became most receptive to the Japanese aesthetic at that time. The thesis includes a case study of Leon Wyczółkowski’s interbellum Japonisme, and interprets it as patriotic transpositions of the work of Hiroshige and the Japanese genre of meisho-e. Japonisme in Polish design and architecture is addressed only in the context of the creation of Polish national style in design (1901-1939). Art schools in Britain and America became important centres for Japonisme at the beginning of the 20th century. The thesis considers the case of Cracow Academy of Fine Arts, which due to radical changes introduced by its new director Julian Fałat, became an important centre for the dissemination of the taste for Japanese art in Poland.

Kao, David. "The vibro-acoustic modelling and analysis of damage mechanisms in paper". Thesis, University of Greenwich, 2006. http://gala.gre.ac.uk/6205/.

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This thesis investigates the use of the acoustic emission (AE) monitoring technique for use in identifying the damage mechanisms present in paper associated with its production process. The microscopic structure of paper consists of a random mesh of paper fibres connected by hydrogen bonds. This implies the existence of the two damage mechanisms of interest, the failure of a fibre/fibre bond and the failure of a fibre. The majority of this work focuses on the development of a novel hybrid mathematical model which couples the mechanics of the mass/spring model to the acoustic wave propagation model for use in generating the acoustic signal emitted by complex structures of paper fibres under strain. A discussion of the coupling method is presented and the model is then analysed using a simple plucked fibre as a test case with a comparison between the numerical and experimental results. The hybrid mathematical model is then used to simulate small fibre networks aimed at providing information on the acoustic response of each damage mechanism. To do this the mass/spring model must successfully simulate the response of the fibre structure when undergoing a fibre/fibre bond failure or a fibre failure. This can be achieved by dynamically manipulating the mass and spring elements of the fibre structure. The simulated AEs from the two damage mechanisms are then analysed using a Continuous Wavelet Transform (CWT) to provide a two dimensional time/frequency representation of the signal. From the CWT certain features of the AEs can be attributed to each damage mechanism and as such a criteria for the time and frequency properties of each damage mechanism can be formulated. This criterion provides the basis for identifying the damage mechanisms present in the experimental data. The final contribution of this thesis is the investigation of training an intelligent classifier which can dynamically identify the AEs from the two damage mechanisms. This is achieved by converting the time and frequency criteria for each damage mechanisms into a set of features for the training of a Self-Organising Map (SOM). The significant step in this analysis is the method for the extraction of the features from the CWT of the AE. This work successfully combines four different scientific areas, paper physics, acoustic emission technology, data analysis and computational modelling to provide an insight into the micro-mechanics of paper. The most significant contribution of this work is the development of the hybrid model which has the ability to generate the acoustic response of a paper fibre structure undergoing two different damage processes. This alone has provided a significant insight into the micro-mechanics of paper to allow for the identification of the two damage mechanisms when the AEs are analysed with the CWT. Other contributions include the method used for the extraction of relevant features from the CWT to enable the training of a SOM for identifying the type of damage mechanism the AE originated from.

Peloso, Pietro. "Possibili soluzioni per garantire qos nelle comunicazioni inter-data centers in ambienti cloud computing". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/6205/.

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Nel presente lavoro, partendo dalla definizione di alcuni punti chiavi del concetto di cloud computing, si è insistito molto sulle problematiche relative alle performance degli ambenti cloud, e alle diverse proposte attualmente presenti sul mercato con i relativi limiti. Dopo averle illustrate in modo dettagliato, le diverse proposte sono state tra loro messe a confronto al fine di evidenziare, per ciascuna di essa, tanto gli aspetti positivi quanto i punti di criticità.

Strusi, Valentina <1985&gt. "Toward a 3D in vitro model based on decellularized thymus to maintain adult thymic ephitelial cells functionality". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6205/.

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During my PhD,I have been develop an innovative technique to reproduce in vitro the 3D thymic microenvironment, to be used for growth and differentiation of thymocytes, and possible transplantation replacement in conditions of depressed thymic immune regulation. The work has been developed in the laboratory of Tissue Engineering at the University Hospital in Basel, Switzerland, under the tutorship of Prof.Ivan Martin. Since a number of studies have suggested that the 3D structure of the thymic microenvironment might play a key role in regulating the survival and functional competence of thymocytes, I’ve focused my effort on the isolation and purification of the extracellular matrix of the mouse thymus. Specifically, based on the assumption that TEC can favour the differentiation of pre-T lymphocytes, I’ve developed a specific decellularization protocol to obtain the intact, DNA-free extracellular matrix of the adult mouse thymus. Two different protocols satisfied the main characteristics of a decellularized matrix, according to qualitative and quantitative assays. In particular, the quantity of DNA was less than 10% in absolute value, no positive staining for cells was found and the 3D structure and composition of the ECM were maintained. In addition, I was able to prove that the decellularized matrixes were not cytotoxic for the cells themselves, and were able to increase expression of MHC II antigens compared to control cells grown in standard conditions. I was able to prove that TECs grow and proliferate up to ten days on top the decellularized matrix. After a complete characterization of the culture system, these innovative natural scaffolds could be used to improve the standard culture conditions of TEC, to study in vitro the action of different factors on their differentiation genes, and to test the ability of TECs to induce in vitro maturation of seeded T lymphocytes.

Laflamme, Patrick. "Superstitious perception in humans and convolutional neural networks". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62605.

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The advent of complex Hierarchical Convolutional Neural Networks (HCNNs) has led to great progress in the field of computer vision, with modern implementations of HCNNs rivalling human performance in object recognition tasks. The design of HCNNs was inspired by current understanding of how the neurons of the human visual system are organized to support object recognition. There are researchers who claim that the computations undertaken by HCNNs are approximating those of the human visual system, because of their high accuracy in predicting the neural activity of regions of the brain involved in object classification (Cichy, Khosla, Pantazis, Torralba, & Oliva, 2016; Khaligh-Razavi & Kriegeskorte, 2014; Yamins et al., 2014). However, there has been little investigation of how HCNNs and humans compare on other tasks that HCNNs have not been trained on. Our study compared the similarity of one HCNN, AlexNet, and humans on a superstitious perception task that involves falsely recognizing a learned object in the absence of strong evidence for its presence. We began by validating a new technique that quantifies human performance on the superstitious perception task. The first phase of the research revealed that human behaviour in the task is dependent on whether participants employed an active or passive task strategy. Next, the responses of our HCNN to the same images were analyzed in a similar manner. The results showed that HCNNs behaved similarly to humans in some ways and differently in others. Specifically, the classification images generated for the HCNN were similar to those derived from human participants, but the HCNN was also more consistent in its responses than humans. A second finding was that the differences in human participants classification images (created by adopting active versus passive strategies) could not be accounted for by simply altering the proportion of false alarm responses in the HCNN. This suggests that HCNNs may be using criteria similar to humans’ perception when evaluating the likelihood of an object being present. The higher similarity between humans and HCNN in the passive condition suggests that the criteria similarities are largest when humans recruit minimal central executive resources in the decision-making process.
Arts, Faculty of
Psychology, Department of
Graduate

Tomm, Brandon M. "Attentional trade-offs under resource scarcity". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62705.

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Resource scarcity poses challenging demands on the cognitive system. Budgeting with limited resources induces an attentional focus on the problem at hand, but it also comes with a cost. Specifically, scarcity causes a failure to notice beneficial information in the environment, or remember to execute actions in the future, that help alleviate the condition of scarcity. This neglect may arise as a result of attentional narrowing. Attentional trade-offs under scarcity can further determine memory encoding. In seven experiments, we demonstrated that participants under scarcity prioritized price information but neglected a useful discount when ordering food from a menu (Experiment 1); they showed better recall for information relevant to the focal task at a subsequent surprise memory test (Experiments 2 and 3); they performed more efficiently on the focal task but neglect a useful cue in the environment that could save them resources (Experiments 4-6); and they failed to remember the previous instructions to execute future actions that could save them resources (Experiment 7). These results collectively demonstrate that scarcity fundamentally shapes the way people process information in the environment, by directing attention to the most urgent task, while inducing a neglect of other information that can be beneficial. The attentional neglect and memory failures may lead to suboptimal behaviors that further aggravate the condition of scarcity. The results provide new insights on the behaviors of the poor, and also important implications for public policy and the design of welfare services and programs for low-income individuals.
Arts, Faculty of
Psychology, Department of
Graduate

Luke, Haliburton. "A clinical C-arm base-tracking system using computer vision for intraoperative guidance". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62905.

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Mobile C-arm X-ray machines are commonly used for imaging during orthopaedic surgeries to visualize internal anatomy during procedures. However, there is evidence indicating that excess operating time and radiation exposure result from the use of scouting images to aid C-arm positioning during surgery. Additionally, C-arms are currently used primarily as a qualitative tool. Several techniques have been proposed to improve positioning, reduce radiation exposure, and increase quantitative utility, but they require accurate C-arm position tracking. There have been attempts by other research groups to develop C-arm tracking systems, but there are currently no solutions suitable for use in an operating room. The objective of this thesis is therefore to present the development and verification of a real-time C-arm base-tracking system called OPTIX (On-board Position Tracking for Intraoperative X-rays). The proposed tracking system uses a single floor-facing camera mounted to the base of a C-arm. A computer vision algorithm was developed that tracks motion relative to the operating room floor. This system is capable of relative motion tracking as well as absolute position recovery for previous positions. The accuracy of the system was evaluated on a real C-arm in a simulated operating room. The experimental results demonstrated that the relative tracking algorithm can measure C-arm translation with errors of less than 0.75% of the total distance travelled, and orientation with errors better than 5% of the cumulative rotation. With the incorporated loop closure step, OPTIX can be used to achieve C-arm repositioning with translation errors of less than 1.10±0.07 mm and rotation errors of less than 0.17 ±0.02°. These results are well within the desired system requirements of 5 mm and 3.1°. The system has shown promising results for use as a C-arm base-tracking system. The system has clinically acceptable accuracies and should lead to a reduced need for scouting images when re-obtaining a previous position. The base-tracking system can be integrated with a C-arm joint tracking system, or implemented on its own for steering guidance. When implemented in an operating room, OPTIX has the potential to lead to a reduction in operating time and harmful radiation exposure to surgical staff.
Applied Science, Faculty of
Graduate

Ntšekhe, Mathe V. K. "Building IKhwezi, a digital platform to capture everyday Indigenous Knowledge for improving educational outcomes in marginalised communities". Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/62505.

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Aptly captured in the name, the broad mandate of Information and Communications Technologies for Development (ICT4D) is to facilitate the use of Information and Communication Technologies (ICTs) in society to support development. Education, as often stated, is the cornerstone for development, imparting knowledge for conceiving and realising development. In this thesis, we explore how everyday Indigenous Knowledge (IK) can be collected digitally, to enhance the educational outcomes of learners from marginalised backgrounds, by stimulating the production of teaching and learning materials that include the local imagery to have resonance with the learners. As part of the exploration, we reviewed a framework known as Technological Pedagogical Content Knowledge (TPACK), which spells out the different kinds of knowledge needed by teachers to teach effectively with ICTs. In this framework, IK is not present explicitly, but through the concept of context(s). Using Afrocentric and Pan-African scholarship, we argue that this logic is linked to colonialism and a critical decolonising pedagogy necessarily demands explication of IK: to make visible the cultures of the learners in the margins (e.g. Black rural learners). On the strength of this argument, we have proposed that TPACK be augumented to become Indigenous Technological Pedagogical Content Knowledge (I-TPACK). Through this augumentation, I-TPACK becomes an Afrocentric framework for a multicultural education in the digital era. The design of the digital platform for capturing IK relevant for formal education, was done in the Siyakhula Living Lab (SLL). The core idea of a Living Lab (LL) is that users must be understood in the context of their lived everyday reality. Further, they must be involved as co-creators in the design and innovation processes. On a methodological level, the LL environment allowed for the fusing together of multiple methods that can help to create a fitting solution. In this thesis, we followed an iterative user-centred methodology rooted in ethnography and phenomenology. Specifically, through long term conversations and interaction with teachers and ethnographic observations, we conceptualized a platform, IKhwezi, that facilitates the collection of context-sensitive content, collaboratively, and with cost and convenience in mind. We implemented this platform using MediaWiki, based on a number of considerations. From the ICT4D disciplinary point of view, a major consideration was being open to the possibility that other forms of innovation—and, not just ‘technovelty’ (i.e. technological/- technical innovation)—can provide a breakthrough or ingenious solution to the problem at hand. In a sense, we were reinforcing the growing sentiment within the discipline that technology is not the goal, but the means to foregrounding the commonality of the human experience in working towards development. Testing confirmed that there is some value in the platform. This is despite the challenges to onboard users, in pursuit of more content that could bolster the value of everyday IK in improving the educational outcomes of all learners.

Massie, Mark (Mark Edward). "A generalized optimization methodology for isotope management". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62705.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2010.
"Research funded by the Department of Energy's Advanced Fuel Cycle Initiative Fellowship"--Abstract. Cataloged from PDF version of thesis.
Includes bibliographical references (p. 91-93).
This research, funded by the Department of Energy's Advanced Fuel Cycle Initiative Fellowship, was focused on developing a new approach to studying the nuclear fuel cycle: instead of using the trial and error approach currently used in actinide management studies in which reactors are designed and then their performance is evaluated, the methodology developed here first identified relevant fuel cycle objectives like minimizing decay heat production in a repository, minimizing Pu-239 content in used fuel, etc. and then used optimization to determine the best way to reach these goals. The first half of this research was devoted to identifying optimal flux spectra for irradiating used nuclear fuel from light water reactors to meet fuel cycle objectives like those mentioned above. This was accomplished by applying the simulated annealing optimization methodology to a simple matrix exponential depletion code written in Fortran using cross sections generated from the SCALE code system. Since flux spectra cannot be shaped arbitrarily, the second half of this research applied the same methodology to material composition of fast reactor target assemblies to find optimal designs for minimizing the integrated decay heat production over various timescales. The neutronics calculations were performed using modules from SCALE and ERANOS, a French fast reactor transport code. The results of this project showed that a thermal flux spectrum is much more effective for transmuting used nuclear fuel. In the spectral optimization study, it was found that a thermal flux spectrum is approximately five times more effective at reducing long-term decay heat production than a fast flux spectrum. This conclusion was reinforced by the results of the target assembly material optimization study, which found that by adding an efficient moderator to a target assembly designed for minor actinide transmutation, the amount of decay heat generated over 10,000 years of cooling can be reduced by over 50% through a single pass in a fast reactor without exceeding standard cladding fluence limits.
by Mark Massie.
S.M.

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Libri sul tema "62D05":

Schindler, Antonín. Navrhování ocelových mostních konstrukcí: Komentář k ČSN 73 6205. Praha: Vydavatelství Úřadu pro normalizaci a měření, 1986.

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Henshaw, Michael L. Protection against lightning: A UK guide to the practical application of BS EN 62305. London: British Standards Institution, 2007.

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United States. National Transportation Safety Board. Derailment of Union Pacific Railroad unit freight train 6205 west near Kelso, California, January 12, 1997. Washington, D.C: National Transportation Safety Board, 1998.

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Miguet, Serge, Annick Montanvert e Stéphane Ubéda, a cura di. Discrete Geometry for Computer Imagery. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-62005-2.

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Huang, Zhisheng, Wouter Beek, Hua Wang, Rui Zhou e Yanchun Zhang, a cura di. Web Information Systems Engineering – WISE 2020. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-62005-9.

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Li, Wuyungerile, e Dalai Tang, a cura di. Mobile Wireless Middleware, Operating Systems and Applications. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-62205-3.

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Fares, Gustavo. Domingo F. Sarmiento’s Argirópolis. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-62305-0.

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Wang, Cao. Structural Reliability and Time-Dependent Reliability. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-62505-4.

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Warnecke-Berger, Hannes, a cura di. Development, Capitalism, and Rent. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-62605-1.

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Bodden, Eric, Mathias Payer e Elias Athanasopoulos, a cura di. Engineering Secure Software and Systems. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62105-0.

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Capitoli di libri sul tema "62D05":

Meppelink, Jan. "Applied Pulse Shapes 0.25/100 According to IEC 62305-1". In The Lightning Rod as a Danger, 169–71. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30434-7_19.

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Meppelink, Jan. "Effect of Site Insulation with Gravel According to IEC 62305-3". In The Lightning Rod as a Danger, 89. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30434-7_8.

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Meppelink, Jan. "Effect of Site Insulation with Asphalt According to IEC 62305-3". In The Lightning Rod as a Danger, 57–87. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30434-7_7.

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Françon, Jean. "On recent trends in discrete geometry in computer science". In Discrete Geometry for Computer Imagery, 1–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-62005-2_1.

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Frey, Pascal J., e Houman Borouchaki. "Finite element meshes by means of voxels". In Discrete Geometry for Computer Imagery, 113–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-62005-2_10.

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Kenmochi, Yukiko, Atsushi Imiya e Norberto F. Ezquerra. "Polyhedra generation from lattice points". In Discrete Geometry for Computer Imagery, 127–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-62005-2_11.

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Françon, Jean, Jean-Maurice Schramm e Mohamed Tajine. "Recognizing arithmetic straight lines and planes". In Discrete Geometry for Computer Imagery, 139–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-62005-2_12.

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Fiorio, Christophe. "A topologically consistent representation for image analysis: The Frontiers Topological Graph". In Discrete Geometry for Computer Imagery, 151–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-62005-2_13.

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Ayala, R., E. Domínguez, A. R. Francés e A. Quintero. "Determining the components of the complement of a Digital (n−1)-manifold in ℤn". In Discrete Geometry for Computer Imagery, 163–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-62005-2_14.

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Ibáñez, Luis, Chafiaâ Hamitouche e Christian Roux. "Determination of discrete sampling grids with optimal topological and spectral properties". In Discrete Geometry for Computer Imagery, 177–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-62005-2_15.

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Atti di convegni sul tema "62D05":

Siow Chun Lim, Chandima Gomes, Mohd Zainal Abidin Ab Kadir e Jasronita Jasni. "Ambiguity of grounding specifications: IEC 62305 revisited". In 2012 International Conference on Lightning Protection (ICLP). IEEE, 2012. http://dx.doi.org/10.1109/iclp.2012.6344293.

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Javor, Vesna. "New functions for representing IEC 62305 standard lightning currents". In 2010 30th International Conference on Lightning Protection (ICLP). IEEE, 2010. http://dx.doi.org/10.1109/iclp.2010.7845806.

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"High Alumina Cement-Silica Fume Mixtures in the Presence of Superplasticizers". In SP-173: Fifth CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete. American Concrete Institute, 1997. http://dx.doi.org/10.14359/6205.

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Rousseau, Alain, e Alexander Kern. "How to deal with environmental risk in IEC 62305-2". In 2014 International Conference on Lightning Protection (ICLP). IEEE, 2014. http://dx.doi.org/10.1109/iclp.2014.6973180.

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Stefanescu, Silviu, e Aurel Botezan. "Overview of the protection lightning standards suite EN/IEC 62305". In 2016 International Conference and Exposition on Electrical and Power Engineering (EPE). IEEE, 2016. http://dx.doi.org/10.1109/icepe.2016.7781391.

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Rousseau, Alain, Celine Sainte-Rose-Fanchine e Mitchell Guthrie. "Application of environmental risk according to IEC 62305-2 Edition 2". In 2015 International Symposium on Lightning Protection (XIII SIPDA). IEEE, 2015. http://dx.doi.org/10.1109/sipda.2015.7339327.

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Liu, Wenjun, e Mehdi Asheghi. "Thermal Conductivity of Ultra Thin Single Crystal Silicon Layers: Part I — Experimental Measurements at Room and Cryogenic Temperatures". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62105.

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Self-heating in deep submicron transistors (e.g., Silicon-on-insulator and strained-Si) and thermal engineering of many nanoscale devices such as nanocalorimeters and high-density thermomechanical data storage are strongly influenced by thermal conduction in ultra-thin silicon layers. The lateral thermal conductivity of single-crystal silicon layers of thicknesses 20 and 100 nm at temperatures between 30 and 300 K was measured using Joule heating and electrical-resistance thermometry in suspended microfabricated structures. In general, a large reduction in thermal conductivity resulting from phonon-boundary scattering, particularly at low temperatures, is observed. Thermal conductivity of the 20 nm thick silicon layer at room temperature is nearly 22 W m−1K−1, compared to the bulk value, 148 W m−1K−1. The predictions of the classical thermal conductivity theory that accounts for the reduced phonon mean free paths based on a solution of the Boltzmann transport equation along a layer agrees well with the experimental results.

Lee, Y. C. E., E. H. K. Fung, J. Q. Zou e H. W. J. Lee. "A Computational Optimal Control Approach to the Design of a Flexible Rotating Beam With Active Constrained Layer Damping". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62205.

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In this paper, a computational approach is adopted to solve the optimal control and optimal parameter selection problems of a rotating flexible beam fully covered with active constrained layer damping (ACLD) treatment. The beam rotates in a vertical plane under the gravitational effect with variable angular velocity and carries an end mass. Tangent coordinate system and the moving coordinate system are used in the system modeling. Due to the highly nonlinear and coupled characteristics of the system, a relative description method is used to represent the motion of the beam and the motion equations are set up by using relative motion variables. Finite element shape functions of a cantilever beam [1] are used as the displacement shape functions in this study. Lagrangian formulation and Raleigh-Ritz approach [2] are employed to derive the governing equations of motion of the nonlinear time-varying system. The problem is posed as a continuous-time optimal control problem. The control function parameters are the control gains. The two system parameters are the thickness of the constraining layer and the viscoelastic material layer. The software package MISER3.2, which is based on the Control Parametrization and the Control Parametrization Enhancing Transform (CPET) techniques is used to solve the combined problems. The optimal solution takes the end deflection, control voltage and the total weight into account. Results show that substantial improvements are obtained with ACLD as compared to the passive constrained layer damping (PCLD) treatment.

Hamada, Hiroyuki, Asami Nakai, Kazuya Eto e Kenichi Sugimoto. "Mechanical Properties of Matrix Hybrid Thick-Composites". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62305.

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For the purpose of more safety boats, the large thickness of outer plates is required to increase flexural stiffness, strength and impact properties. Some problems in mechanical properties are generated by increasing in thickness because the effect of interlaminar shearing of Thick-composites on whole mechanical properties is greater than that of thin-composites. We have investigated the matrix hybrid composite with two kinds of unsaturated polyester, one was hard type resin with low toughness and the other was flexible type resin with low modulus and high toughness. In this study, matrix hybrid composite was focused and applied to Thick-composites. First, the flexural properties were investigated and the micro fracture progress was precisely observed with in-situ observation using replica method. Then, impact properties of the Thick-composites were examined and the availability of matrix hybrid composite was investigated. It was concluded that the matrix hybrid composite achieved high performance in both static and impact load.

Mesquita, Maximilian S., e Marcelo J. S. de Lemos. "Macroscopic Modeling of Turbulent Mass Transport in Heterogeneous Porous Media". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62405.

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In this work, results for a macroscopic mass transport model are presented for a parallel plate channel filled with a fluid saturated heterogeneous porous medium. The numerical methodology herein employed is based on the control volume approach. Turbulence is assumed to exist within the fluid phase. High and low Reynolds k-e models were used to model such non-linear effects. The flow equations at the pore-scale were numerically solved using the SIMPLE method applied to a non-orthogonal boundary-fitted coordinate system. Integrated mass fraction results were compiled leading to correlations for the mass dispersion coefficients in the x and y directions. Application of the macroscopic model using the proposed correlations showed the role of dispersion mechanism in the overall transport in porous media.