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Porosity estimation by semi-supervised learning with sparsely available labeled samples
Lima, Luiz Alberto,Gö,rnitz, Nico,Varella, Luiz Eduardo,Vellasco, Marley,Mü,ller, Klaus-Robert,Nakajima, Shinichi Elsevier 2017 Computers & geosciences Vol.106 No.-
<P><B>Abstract</B></P> <P>This paper addresses the porosity estimation problem from seismic impedance volumes and porosity samples located in a small group of exploratory wells. Regression methods, trained on the impedance as inputs and the porosity as output labels, generally suffer from extremely expensive (and hence sparsely available) porosity samples. To optimally make use of the valuable porosity data, a semi-supervised machine learning method was proposed, <I>Transductive Conditional Random Field Regression</I> (TCRFR), showing good performance (Görnitz et al., 2017). TCRFR, however, still requires more labeled data than those usually available, which creates a gap when applying the method to the porosity estimation problem in realistic situations. In this paper, we aim to fill this gap by introducing two graph-based preprocessing techniques, which adapt the original TCRFR for extremely weakly supervised scenarios. Our new method outperforms the previous automatic estimation methods on synthetic data and provides a comparable result to the manual labored, time-consuming geostatistics approach on real data, proving its potential as a practical industrial tool.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A porosity estimation method with simultaneous facies classification is proposed. </LI> <LI> The method combines the benefits of ridge regression and conditional random fields. </LI> <LI> Two preprocessing techniques are introduced, inspired from image processing. </LI> </UL> </P>
Luiz Carlos Borges,Marilia Braz Botelho 국립민속박물관 2008 International Journal of Intangible Heritage Vol.3 No.-
The intangible heritage is not easy to present in amuseum exhibition, and this is perhaps especially so inthe case of what the 2003 UNESCO Intangible HeritageConvention terms ‘knowledge and practices concerningnature and the universe’. The Brazilian Federal Museumof Astronomy and Related Sciences (MAST), Rio deJaneiro, initiated an exhibition and educationalprogramme on this theme for International MuseumsWeek in 2004, focusing particularly on four very differentcosmologies (i.e. narratives that attempt to explain theorigin of the Universe): the Biblical story in Genesis, thecontemporary scientific ‘Big Bang’ theory, and thecreation stories of two Brazilian indigenous populations:the Tukano people of the Amazon Region, and the Guaraniof southern Brazil and some neighbouring countries. Theevent, called Myths of Origin - man and hiscomprehension of the Universe and of the planet on whichhe lives, consisted of a conceptual, sensory andeducational experience whose principal objective was tochallenge preconceptions while questioning also thevisitors’ perceptions which arise from an educationalsystem where many of these ideas are taught as absolutetruths. Following Paulo Freire’s theory of learning and anon-restrictive understanding of the sciences, we choseto present the four different narratives on an equal basisand invited the visitor to explore these withoutpreconceptions. The underlying objective was to establisha dialogue among these diverse discourses about thecosmos, which we hoped would encourage visitors to takea critical view of the sciences and the way they areinterpreted in museums.
Luiz O. Oliveira,남영우,Rudolf Jung,Niels C. Nielsen 한국분자세포생물학회 2002 Molecules and cells Vol.13 No.1
A short interdomain sequence between the N- and Cterminal domains of b-conglycinin, the major 7S seed storage protein of soybean, was selected as a target for insertion of amino acid residues specifically cleaved by an asparaginyl endopeptidase that processes 11S globulins into acidic and basic chains. Modified b- conglycinin subunits containing the proteolytic cleavage site self-assembled into trimers in vitro at an efficiency similar to that of the unmodified subunit. In contrast to the absence of cleavage of the unmodified subunits, however, the modified b-conglycinin trimers were processed by purified soybean asparaginyl endopeptidase into two polypeptides, each the size expected for the b-conglycinin N- and C-terminal domains, respectively. The cleavage did not alter the assembly of mutant b-conglycinins and the cleaved mutant trimers remained stable to further proteolytic attack. To examine the possibility of coassembly between the cleaved 11S and 7S subunits, in vitro processed mutant b-conglycinin subunits were mixed with native dissociated 11S globulin preparations. Reassembly at a high ionic condition did not induce the 7S subunits to interact with 11S subunits to form hexameric complexes. Thus, cleavage of 7S globulin subunits into acidic and basic domains may not be sufficient for hexamer as-
Effects of Extrusion Variables on Functional and Nutritional Properties of Extruded Oat Products
Luiz Carlos Gutkoski,Ahmed Atia EI-Dash 한국식품영양과학회 1999 Preventive Nutrition and Food Science Vol.4 No.3
The purpose of this research was to study the effects of initial moisture levels and extrusion temperatures on dietary fiber, nitrogen solubility index, available lysine, and the in vitro protein digestibility of extruded oat products. The dehulled grains were ground in a Brabender Quadrumat Senior mill and the coarse fraction, with higher crude protein, lipids and dietary fiber were conditioned to various moisture levels (15.5~25.5%) and extruded in a Brabender single-screw laboratory extruder. The extrudates showed a higher amount of soluble dietary fiber (8.14%) than in the raw material. However, the extrusion process affected the nutritional value of the protein due to a decrease in available lysine with increased temperature. The in vitro protein digestibility was unaffected by initial moisture levels and the extrusion temperatures examined.
Luiz Paulo Carvalho Rocha,Tânia de Carvalho Rocha,Stephanie de Cássia Carvalho Rocha,Patrícia Valéria Henrique,Flávio Ricardo Manzi,Micena Roberta Miranda Alves e Silva 대한영상치의학회 2020 Imaging Science in Dentistry Vol.50 No.2
Purpose: In this study, we used ultrasonography to monitor the use of hyaluronic acid (HA) as a filler in the face for esthetic reasons. We monitored changes in the filler shape, distribution, and relationship with adjacent anatomical structures over a 180-day period. Materials and Methods: Two patients each received an ultrasound-guided injection of HA, with different products and application sites for each patient. In 1 patient, the injection was administered in the angle of the mandible, while in the other, it was administered in the zygomatic region. The injection sites were monitored via ultrasonography at 24 hours, 30 days, and 180 days, at which times the imaging characteristics of the filler were observed. All injections were performed by the same professional, as were the ultrasound exams, which were conducted using the same equipment. Results: In both cases, the HA fillers were visualized using ultrasound at all time points. Some differences were observed between the cases in the images and the distribution of the pockets of filler. In 1 case, the filler appeared as a dark hypoechoic region with well-defined contours, and the material was observed to have moved posteriorly by the 180-day mark. In the other case, the material appeared hyperechoic relative to the previous case and presented no noticeable changes in its anteroposterior distribution over time. Conclusion: Based on these 2 cases, ultrasonography can be a complementary tool used to monitor facial fillers over the long term, allowing for the dynamic observation of different fillers.
Impact of radiotherapy on mandibular bone: A retrospective study of digital panoramic radiographs
Luiz Felipe Palma,Ricardo Yudi Tateno,Cíntia Maria Remondes,Marcelo Marcucci,Arthur Rodriguez Gonzalez Cortes 대한영상치의학회 2020 Imaging Science in Dentistry Vol.50 No.1
Purpose: The purpose of this study was to investigate the impact of radiotherapy on mandibular bone tissue in head and neck cancer patients through an analysis of pixel intensity and fractal dimension values on digital panoramic radiographs. Materials and Methods: Thirty patients with radiographic records from before and after 3-dimensional (3D) conformational radiotherapy were selected. A single examiner carried out digital analyses of pixel intensity values and fractal dimensions, with the areas of interest unilaterally located in the right angle medullary region of the mandible below the mandibular canal and posterior to the molar region. Results: Statistically significant decreases were observed in the mean pixel intensity (P=0.0368) and fractal dimension (P=0.0495) values after radiotherapy. Conclusion: The results suggest that 3D conformational radiotherapy for head and neck cancer negatively affected the trabecular microarchitecture and mandibular bone mass.