1,721,153 research outputs found
Active contour models for knee cartilage and meniscus ultrasound image segmentation / Amir Faisal
Get PDFQuantification of the cartilage degeneration as well as the meniscus degeneration
and displacement requires segmentation of various parts of the knee joints in the twodimensional
ultrasound images in order to provide a direct measurement of the cartilage
thickness and the meniscus area and position, respectively. The goal in the knee cartilage
ultrasound image segmentation is to locate the boundaries of a monotonous hypoechoic
band between hyperechoic lines of the soft tissue-cartilage interface and of the cartilagebone
interface. Hence, the true thickness between the two interfaces can be computed
based on the segmented images. Meanwhile, the goal in segmenting the meniscus ultrasound
image is to locate the femoral condyle, the meniscus, and the tibial plateau simultaneously.
This thesis presents active contour models for knee cartilage and meniscus
ultrasound image segmentation. Cartilage boundary segmentation using locally statistical
level setmethod (LSLSM) and cartilage thickness estimation using the normal distance are
presented. In addition, multiple active contours using scalable local regional information
on expandable kernel (MLREK) have been proposed to capture multiple, separate objects
of the femoral condyle, the meniscus, and the tibial plateau. Segmentation performance
is then validated using Dice coefficient and Hausdorff distance metrics. Segmentation
results of the presented methods are compared to the existing active contour methods in
the attempt of segmenting the knee cartilage andmeniscus in the ultrasound images, which
show an improvement on the segmentation performance offered by the proposed methods.
The choice of various parameters in MLREK in response to the segmentation outcome
is then investigated. A demonstration on how to choose the threshold value to adapt the
kernel size in order to successfully reach the boundary concavity is given. The ability
of multiple contours in preventing merging and overlapping in the shared boundaries of separate regions is shown. A flexibility in setting each contour with different parameter
values for multiple structure segmentation is also illustrated. MLREK has shown to perform
multiple object segmentation all at once in an ultrasound image. Application of the
presented methods to segment a set of the knee cartilage and meniscus ultrasound images
illustrates a good and consistent segmentation performance. The reproducibility of the
ultrasound-based cartilage thicknessmeasurements using intraclass correlation coefficient
and agreement between pairs of the measurements by the normal distance and the manual
measurement using Bland-Altman analysis are determined. The cartilage segmentation
possiblewith LSLSMhas allowed the obtained segmentation results to be used formaking
the cartilage thickness computation. The robustness of themethods described against various
thickness of the cartilage and various shapes and areas of themultiple objects indicates
a potential of the methods to be applied for the assessment of the cartilage degeneration
as well as the meniscus degeneration and displacement. The cartilage degeneration and
the meniscus degeneration and displacement typically seen as changes in the cartilage
thickness and the meniscus area and position can be quantified over time by comparing
the cartilage thickness and the meniscus area and position at a certain time interval
Design and fabrication of exhaust fan cleaner / Wan Amir Faisal Wan Adzmani
Get PDFExhaust fans are used to pull excess moisture and unwanted odours out of a particular room or area. They are commonly found in bathrooms and kitchens, where moisture can build up due to activities such as showering, washing, or cooking. The objective of this project is to build an exhaust fan with its own cleaning mechanism. Cleaning exhaust fan had always been a common thing as it will increase its efficiency when cleaned. The problem arise when the cleaning process occur and a lot of things had to be stop in order for the exhaust fan to be clean. Cleaning the exhaust fan also consume a lot of energy as the process for cleaning it have a lot of steps. The expectation from this project is to lessen the burden of workers with an exhaust fan that can clean itself and the cleaning process of the exhaust fan will not interfere with the workers works
Go No-Go 555-timer / Amir Faisal Khamshah and Mohd. Rozimi Daud
Get PDFWe are pleased to present a project that entitle Go No-Go 555 tester. We feel this project will be successful in introducing student the function of 555 timer and its operation, also the other ic’s which is flip-flop (74107) and NAND gate (7400). With considerable help from students and instructor, we are reconstructed the actual circuit to improve its functions. Our main goal are to increase student understanding of 555 timer tester, especially the components which in this circuit. In this project, we covered all components, discussing their characteristic and how the component operate, also operation of the circuit. We also include file of this circuit, which have drawn in electronic workbench software. So that we can learn all the waves and networking patterns where can be seen in practical work. Some waveforms have discussed in this report and the complete report of 555-timer tester is in report. Hardware, which had done, gives more description about this project. Design circuit on PCB, arranging component. The 555 timers is one of the most useful electronic devices in the market. Sometimes it is impossible to imaging our life without it. Signetics first introduced the 555 timers but today almost every semiconductor firm manufactures it. For this reason it is very cheap and broadly available. Here some peculiar uses of the 555 are going to be presentiment give more information about the circuit characteristic and more specific description
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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