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Marie, Nathalie, Simon Li, Amandine Marrel, Michel Marquès, Sophie Bajard, Annick Tosello, Jorge Perez, et al. "VVUQ of a thermal-hydraulic multi-scale tool on unprotected loss of flow accident in SFR reactor." EPJ Nuclear Sciences & Technologies 7 (2021): 3. http://dx.doi.org/10.1051/epjn/2021002.
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Within the framework of the French 4th-generation Sodium-cooled Fast Reactor safety assessment, methodology on VVUQ (Verification, Validation, Uncertainty Quantification) is conducted to demonstrate that the CEA's thermal-hydraulic Scientific Computation Tools (SCTs) are effective and operational for design and safety studies purposes on this type of reactor. This VVUQ-based qualification is a regulatory requirement from the French Nuclear Safety Authority (NSA). In this paper, the current practice of VVUQ approach application for a SFR accidental transient is described with regard to the NSA requirements. It constitutes the first practical, progressively improvable approach. As the SCT is qualified for a given version on a given scenario, the transient related to a total unprotected station blackout has been selected. As it is a very complex multi-scale transient, the SCT MATHYS (which is a coupling of the CATHARE2 tool at system scale, TrioMC tool at component scale and TrioCFD tool at local scale) is used. This paper presents the preliminary VVUQ application to the qualification of this tool on this selected transient. In addition, this work underlines some feedback on design and R&D aspects that should be addressed in the future to improve the SCT.
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Huyghe, Jordan, Vanessa Vallet, David Lecarpentier, Christelle Reynard-Carette, and Claire Vaglio-Gaudard. "How to obtain an enhanced extended uncertainty associated with decay heat calculations of industrial PWRs using the DARWIN2.3 package." EPJ Nuclear Sciences & Technologies 5 (2019): 8. http://dx.doi.org/10.1051/epjn/2019002.
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Decay heat is a crucial issue for in-core safety after reactor shutdown and the back-end cycle. An accurate computation of its value has been carried out at the CEA within the framework of the DARWIN2.3 package. The DARWIN2.3 package benefits from a Verification, Validation and Uncertainty Quantification (VVUQ) process. The VVUQ ensures that the parameters of interest computed with the DARWIN2.3 package have been validated over measurements and that biases and uncertainties have been quantified for a particular domain. For the parameter “decay heat”, there are few integral experiments available to ensure the experimental validation over the whole range of parameters needed to cover the French reactor infrastructure (fissile content, burnup, fuel, cooling time). The experimental validation currently covers PWR UOX fuels for cooling times only between 45 minutes and 42 days, and between 13 and 23 years. Therefore, the uncertainty quantification step is of paramount importance in order to increase the reliability and accuracy of decay heat calculations. This paper focuses on the strategy that could be used to resolve this issue with the complement and the exploitation of the DARWIN2.3 experimental validation.
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Santiago, Alfonso, Constantine Butakoff, Beatriz Eguzkitza, Richard A. Gray, Karen May-Newman, Pras Pathmanathan, Vi Vu, and Mariano Vázquez. "Design and execution of a verification, validation, and uncertainty quantification plan for a numerical model of left ventricular flow after LVAD implantation." PLOS Computational Biology 18, no. 6 (June 13, 2022): e1010141. http://dx.doi.org/10.1371/journal.pcbi.1010141.
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Background Left ventricular assist devices (LVADs) are implantable pumps that act as a life support therapy for patients with severe heart failure. Despite improving the survival rate, LVAD therapy can carry major complications. Particularly, the flow distortion introduced by the LVAD in the left ventricle (LV) may induce thrombus formation. While previous works have used numerical models to study the impact of multiple variables in the intra-LV stagnation regions, a comprehensive validation analysis has never been executed. The main goal of this work is to present a model of the LV-LVAD system and to design and follow a verification, validation and uncertainty quantification (VVUQ) plan based on the ASME V&V40 and V&V20 standards to ensure credible predictions. Methods The experiment used to validate the simulation is the SDSU cardiac simulator, a bench mock-up of the cardiovascular system that allows mimicking multiple operation conditions for the heart-LVAD system. The numerical model is based on Alya, the BSC’s in-house platform for numerical modelling. Alya solves the Navier-Stokes equation with an Arbitrary Lagrangian-Eulerian (ALE) formulation in a deformable ventricle and includes pressure-driven valves, a 0D Windkessel model for the arterial output and a LVAD boundary condition modeled through a dynamic pressure-flow performance curve. The designed VVUQ plan involves: (a) a risk analysis and the associated credibility goals; (b) a verification stage to ensure correctness in the numerical solution procedure; (c) a sensitivity analysis to quantify the impact of the inputs on the four quantities of interest (QoIs) (average aortic root flow Q A o a v g, maximum aortic root flow Q A o m a x, average LVAD flow Q V A D a v g, and maximum LVAD flow Q V A D m a x); (d) an uncertainty quantification using six validation experiments that include extreme operating conditions. Results Numerical code verification tests ensured correctness of the solution procedure and numerical calculation verification showed a grid convergence index (GCI)95% <3.3%. The total Sobol indices obtained during the sensitivity analysis demonstrated that the ejection fraction, the heart rate, and the pump performance curve coefficients are the most impactful inputs for the analysed QoIs. The Minkowski norm is used as validation metric for the uncertainty quantification. It shows that the midpoint cases have more accurate results when compared to the extreme cases. The total computational cost of the simulations was above 100 [core-years] executed in around three weeks time span in Marenostrum IV supercomputer. Conclusions This work details a novel numerical model for the LV-LVAD system, that is supported by the design and execution of a VVUQ plan created following recognised international standards. We present a methodology demonstrating that stringent VVUQ according to ASME standards is feasible but computationally expensive.
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Tuckett, David. "Towards a more facilitating peer environment." International Journal of Psychoanalysis 82, no. 4 (August 2001): 643–51. http://dx.doi.org/10.1516/wa1v-abcr-4lrg-vvuq.
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Vozdova, Miluse, Svatava Kubickova, Halina Cernohorska, Jan Fröhlich, and Jiri Rubes. "Satellite DNA Sequences in Canidae and Their Chromosome Distribution in Dog and Red Fox." Cytogenetic and Genome Research 150, no. 2 (2016): 118–27. http://dx.doi.org/10.1159/000455081.
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Satellite DNA is a characteristic component of mammalian centromeric heterochromatin, and a comparative analysis of its evolutionary dynamics can be used for phylogenetic studies. We analysed satellite and satellite-like DNA sequences available in NCBI for 4 species of the family Canidae (red fox, Vulpes vulpes, VVU; domestic dog, Canis familiaris, CFA; arctic fox, Vulpes lagopus, VLA; raccoon dog, Nyctereutes procyonoides procyonoides, NPR) by comparative sequence analysis, which revealed 86-90% intraspecies and 76-79% interspecies similarity. Comparative fluorescence in situ hybridisation in the red fox and dog showed signals of the red fox satellite probe in canine and vulpine autosomal centromeres, on VVUY, B chromosomes, and in the distal parts of VVU9q and VVU10p which were shown to contain nucleolus organiser regions. The CFA satellite probe stained autosomal centromeres only in the dog. The CFA satellite-like DNA did not show any significant sequence similarity with the satellite DNA of any species analysed and was localised to the centromeres of 9 canine chromosome pairs. No significant heterochromatin block was detected on the B chromosomes of the red fox. Our results show extensive heterogeneity of satellite sequences among Canidae and prove close evolutionary relationships between the red and arctic fox.
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Steinman, David A., and Francesco Migliavacca. "Editorial: Special Issue on Verification, Validation, and Uncertainty Quantification of Cardiovascular Models: Towards Effective VVUQ for Translating Cardiovascular Modelling to Clinical Utility." Cardiovascular Engineering and Technology 9, no. 4 (November 12, 2018): 539–43. http://dx.doi.org/10.1007/s13239-018-00393-z.
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Galappaththige, Suran, Richard A. Gray, Caroline Mendonca Costa, Steven Niederer, and Pras Pathmanathan. "Credibility assessment of patient-specific computational modeling using patient-specific cardiac modeling as an exemplar." PLOS Computational Biology 18, no. 10 (October 10, 2022): e1010541. http://dx.doi.org/10.1371/journal.pcbi.1010541.
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Reliable and robust simulation of individual patients using patient-specific models (PSMs) is one of the next frontiers for modeling and simulation (M&S) in healthcare. PSMs, which form the basis of digital twins, can be employed as clinical tools to, for example, assess disease state, predict response to therapy, or optimize therapy. They may also be used to construct virtual cohorts of patients, for in silico evaluation of medical product safety and/or performance. Methods and frameworks have recently been proposed for evaluating the credibility of M&S in healthcare applications. However, such efforts have generally been motivated by models of medical devices or generic patient models; how best to evaluate the credibility of PSMs has largely been unexplored. The aim of this paper is to understand and demonstrate the credibility assessment process for PSMs using patient-specific cardiac electrophysiological (EP) modeling as an exemplar. We first review approaches used to generate cardiac PSMs and consider how verification, validation, and uncertainty quantification (VVUQ) apply to cardiac PSMs. Next, we execute two simulation studies using a publicly available virtual cohort of 24 patient-specific ventricular models, the first a multi-patient verification study, the second investigating the impact of uncertainty in personalized and non-personalized inputs in a virtual cohort. We then use the findings from our analyses to identify how important characteristics of PSMs can be considered when assessing credibility with the approach of the ASME V&V40 Standard, accounting for PSM concepts such as inter- and intra-user variability, multi-patient and “every-patient” error estimation, uncertainty quantification in personalized vs non-personalized inputs, clinical validation, and others. The results of this paper will be useful to developers of cardiac and other medical image based PSMs, when assessing PSM credibility.
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Marks, David F. "Construct Validity of the Vividness of Visual Imagery Questionnaire." Perceptual and Motor Skills 69, no. 2 (October 1989): 459–65. http://dx.doi.org/10.2466/pms.1989.69.2.459.
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Chara (1989) recently questioned the construct validity of the Vividness of Visual Imagery Questionnaire (VVIQ) on empirical grounds. Unfortunately, Chara in that paper has erroneously construed construct validity as independent of criterion-related validity. This error is compounded by Chara and Verplanck's 1986 assumption that the VVIQ assesses purely memory imagery. Further problems arise from Chara's 1989 selective reporting of the relevant literature. Comprehensive review of the VVIQ literature in its totality is necessary before conclusions are possible concerning the questionnaire's construct validity.
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Marks, David F. "Bibliography of Research Utilizing the Vividness of Visual Imagery Questionnaire." Perceptual and Motor Skills 69, no. 3-1 (December 1989): 707–18. http://dx.doi.org/10.1177/00315125890693-101.
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The Vividness of Visual Imagery Questionnaire (VVIQ) is receiving increasing use as a self-report measure of mental, visual imagery vividness. This bibliography contains lists of the publications and dissertations which report investigations of experimental, correlational, and factor analytical research. It also includes publications in which research utilizing the VVIQ is reviewed, critiqued, and discussed. The bibliography provides a resource for investigators.
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Runge, Matthew, Valery Bakhilau, Faisa Omer, and Amedeo D’Angiulli. "Trial-by-Trial Vividness Self-Reports Versus VVIQ." Imagination, Cognition and Personality 35, no. 2 (June 17, 2015): 137–65. http://dx.doi.org/10.1177/0276236615587490.
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Smyth, Robert SD, Priti Acharya, and Nigel P. Hunt. "Is visual imagery ability higher for orthodontic students than those in other disciplines? A cross-sectional questionnaire-based study." Journal of Orthodontics 46, no. 3 (May 23, 2019): 205–11. http://dx.doi.org/10.1177/1465312519851216.
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Objective: To investigate the effect visual imagery may have on career choice among current university students across a range of subjects and disciplines. Setting: University College London (UCL), UK. Design: Cross-sectional questionnaire-based study. Participants: The study compared four main groups of UCL students: current students at the Slade School of Fine Art; UCL Eastman Dental Institute; UCL Bartlett School of Architecture; and the Faculty of Laws. Method: A questionnaire based on the Vividness of Visual Imagery Questionnaire (VVIQ) was distributed along with questions regarding demographic information. Results: There were no significant differences between the VVIQ scores across the four included Schools/Faculty: The Slade School of Fine Art; UCL Bartlett School of Architecture; Faculty of Laws; and UCL Eastman Dental Institute, F(3,219) = 2.160, P = 0.094. There were also no significant differences in the scores for the Eastman ( M = 60.21, SD = 13.58) and the three other Schools/Faculty ( M = 62.87, SD = 10.96); t(–1.317) = 221, P = 0.189, and no significant difference in the scores for the Orthodontic students ( M = 60.80, SD = 13.39) and the remaining other included students ( M = 61.44, SD = 9.68); t(–0.232) = 221, P = 0.817. Aphantasia was uncommon in this sample, with a prevalence of 0.9%. A positive correlation was found between age group and total VVIQ score, with older participants scoring higher on the VVIQ. Women were significantly more likely to say that their ability to visualise had affected their career choice than male respondents. Conclusions: There were no significant differences between the VVIQ scores across the four included Schools/Faculty. Visual imagery ability did not differ in dental or orthodontic students in comparison to other student groups. Further work is needed to replicate these findings in more diverse samples.
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Chara, Paul J., and Donald A. Hamm. "An Inquiry into the Construct Validity of the Vividness of Visual Imagery Questionnaire." Perceptual and Motor Skills 69, no. 1 (August 1989): 127–36. http://dx.doi.org/10.2466/pms.1989.69.1.127.
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The construct validity of the Vividness of Visual Imagery Questionnaire (VVIQ) was investigated using a series of visual memory tasks. Subjects were shown a picture after completing the questionnaire. Their ability to recall that picture was probed through a free-recall procedure, drawing, two spatial-recall tasks, and a multiple-choice questionnaire. Scores on the VVIQ were statistically unrelated to performance on any of the memory tasks demonstrating a lack of support for construct validity as a measure of visual memory imagery.
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Campos, Alfredo, Ángeles Amor, and María Ángeles González. "Presentation of Keywords by Means of Interactive Drawings." Spanish Journal of Psychology 5, no. 2 (November 2002): 102–9. http://dx.doi.org/10.1017/s1138741600005874.
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One of the main outstanding problems in keyword mnemotechnics is whether this technique is more effective when the subjects generate their own keywords, or when the keywords are supplied by the experimenter. Both methods have advantages and disadvantages. An alternative method has recently been suggested, in which the keywords are generated by the subjects' peers. In the present study we aimed to investigate whether immediate or delayed recall are affected by keyword generation method (experimenter or peer generation). We also aimed to determine whether the method of keyword generation affects imaging capacity as evaluated by questionnaires or spatial tests. A total of 377 secondary-school students were selected and divided into four groups. All subjects were presented with 30 Latin words. Additionally, the subjects in Group 1 were presented with bizarre images, while the subjects of Group 2 were presented with normal images, in both cases representing the keywords selected by peers as interacting with the Latin words. The subjects in Groups 3 and 4 were likewise presented with normal or bizarre images, respectively, but representing the keywords selected by the experimenters. The subjects' imaging capacity was evaluated by means of the Vividness of Visual Imagery Questionnaire (VVIQ) and the Spatial Test of Primary Mental Abilities (ST-PMA). The results were analysed by multivariate analysis of variance (MANOVA) with three factors (ST-PMA imaging capacity, 2 levels; VVIQ imaging capacity, 2 levels; and mnemotechnic method, 4 levels) and dependent variables immediate recall and delayed recall. All three factors influenced recall. Subsequent univariate analyses of variance indicated that subjects with high ST-PMA score and subjects with high VVIQ score showed better immediate and delayed recall than subjects with low ST-PMA score and subjects with low VVIQ score. Mnemotechnic method (i.e. whether keywords are generated by the experimenter or by peers) significantly affected immediate recall but not delayed recall.
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Fominykh, A. V., N. S. Sergeew, and D. P. Ezdin. "Method of Calculating the Parameters of the Process of Reducing Pressure in a Vacuum-Evaporator." IOP Conference Series: Earth and Environmental Science 988, no. 4 (February 1, 2022): 042083. http://dx.doi.org/10.1088/1755-1315/988/4/042083.
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Abstract In agriculture, the use of humic preparations can increase the productivity, productivity of animals and poultry. The growth rate of consumption of humic preparations in 2021 … 2025 will be from 1 to 5% per year and the market capacity in Russia will be 1500 tons per reptile. Improvement of equipment for the production of humic preparations is urgent. The physical and mechanical properties of the humic suspension have been determined. In the production of humic preparations, medical centrifuges OS-6MC, a flow-through sedimentation centrifuge and a periodic vacuum evaporator (VVU) were used to increase the concentration of humic suspension. In terms of the energy of germination and germination of spring wheat, a rational method for increasing the concentration of humic suspension by evaporation has been substantiated. We have developed and patented a line with VVU to increase the concentration of humic suspension [21]. At the exhibition Golden Autumn - 2020 (Moscow) “For the production of highly efficient agricultural machinery and the introduction of advanced resource-saving technologies”: Kurgan State Agricultural Academy was awarded a bronze medal and a diploma: “For the development of a line for the production of a humic preparation.” When the time for the VVU to enter the operating mode is the sum of the heating time of the installation to the operating temperature and the time for the pressure drop in the installation from atmospheric to working. A method has been developed for calculating the time the vacuum evaporator reaches the operating mode at start-up. The heating time of the VVU with a tank of 50 liters from the initial installation temperature of 10 ° C to the boiler temperature of 85 ° C, and of the humic suspension to 60 ° C will be 30 minutes at a power source of 12 kW, which is confirmed by experiment. A method for calculating the parameters of the process of lowering the pressure in the VVU has been developed. Dependencies are obtained for studying the relationship between the design and technological parameters of the VVU when the pressure is reduced from atmospheric to working. The time of pressure reduction with a volume of 1 m3 of the vacuum system will be 5 … 6 minutes, which is confirmed by experiment.
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Simmering, Dietmar, Solomon Addai, Gunther Geller, and Annette Otte. "A university campus in peri-urban Accra (Ghana) as a haven for dry-forest species." Flora et Vegetatio Sudano-Sambesica 16 (December 1, 2013): 10–21. http://dx.doi.org/10.21248/fvss.16.21.
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Valley View University (VVU) is a private university located within the dry forest zone of the Accra plains; an area strongly affected by urban sprawl. The campus covers approx. 105 ha. Considerable portions of it are yet undeveloped and covered with savannah thickets. In 2002, the university has committed itself to become Africa's first "ecological university". In the context of two projects, substantial improvements have been made in terms of sanitation, water supply, energy-saving buildings and organic agriculture. The further development of the campus was designed in a detailed "ecological masterplan". In this context, we carried out a floristic inventory of the savannah thickets and found more than 100 plant species; the majority of which represent the species pool of the unique mixture of dry forest and savannah thicket species, which is typical for the region. As the remainder of dry forests and savannah thickets in the Accra plains become increasingly threatened by urban sprawl and overgrazing, the VVU administration has agreed to preserve the species-rich thickets. This is a valuable contribution to a more sustainable development of the region.
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Dalbey, John, and Marcia C. Linn. "Cognitive Consequences of Programming: Augmentations to Basic Instruction." Journal of Educational Computing Research 2, no. 1 (February 1986): 75–93. http://dx.doi.org/10.2190/8q3h-cvb1-88br-vv2q.
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A study of junior high students was undertaken to investigate the cognitive outcomes of a first course in computer programming. A model for understanding the learning outcomes is presented, called the chain of cognitive consequences. This model describes the knowledge and skills that potentially can be gained from programming. The model suggests how programming instruction could be augmented so as to focus on higher cognitive skills. An experimental design was implemented which compared two “augmentations” to traditional BASIC instruction. Three important findings were modest achievement scores, large between-site variation, and significant effect of augmentations. The limitations of current instruction for producing cognitive outcomes are discussed, and the instructional implications of this study are presented.
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Chu, Li-Li. "The Effects of Web Page Design Instruction on Computer Self-Efficacy of Preservice Teachers and Correlates." Journal of Educational Computing Research 28, no. 2 (March 2003): 127–42. http://dx.doi.org/10.2190/k79g-2pyy-vvu6-x988.
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This study tested the effects of Web page design instruction on improving computer self-efficacy of preservice teachers. A sample of 206 preservice teachers participated in this research. A pretest-posttest design experiment, including a 14-week instruction of Web page design, was conducted. The instruction of Web page design significantly improved the computer self-efficacy of preservice teachers. Various computer experiences, including weekly computer use, weekly Internet use, the use frequencies of word processing, e-mail, games, and presentation software, were significantly related to computer self-efficacy. The use frequencies of word processing and computer graphic software, weekly computer use, and age were the significant predictors of computer self-efficacy. The preservice teachers owning higher perception of computer self-efficacy revealed more confidence on Web page design self-efficacy. Generally, it is confirmed that most educators believe that increasing the opportunities to learn and use computers may facilitate the confidence and competence of preservice teachers.
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Busch, Tor. "Gender, Group Composition, Cooperation, and Self-Efficacy in Computer Studies." Journal of Educational Computing Research 15, no. 2 (September 1996): 125–35. http://dx.doi.org/10.2190/kqjl-rtw1-vvuy-bhlg.
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This study aimed to investigate whether gender, group composition, or self-efficacy in computing has any impact on cooperation, giving or getting task-related help, and level of activity in student groups. The groups were established during a computer course among 150 college students in business administration. According to our results, students with low self-efficacy in computing, and students in groups with a majority of females, cooperated more than any other categories in their work with computers. Furthermore, students with high self-efficacy in computing, and students with a high degree of previous computer experience, offered more task-related help to other students than did the rest. In terms of gender, the level of activity was evaluated as highest in majority-female or majority-male groups. Moreover, female students had significantly lower self-efficacy in computing, less previous computer experience, and they had received less previous encouragement to work with computers. Finally, female students were receiving more task-related help, while at the same time giving less task-related help than male students.
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Smith, David I., and Kylie M. Scoullar. "How Well Informed are Australian General Practitioners about Adolescent Suicide? Implications for Primary Prevention." International Journal of Psychiatry in Medicine 31, no. 2 (June 2001): 169–82. http://dx.doi.org/10.2190/3nb2-vvuy-p8n3-7xkq.
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Objective: To investigate the extent of knowledge of Australian general practitioners (GPs) in terms of critical information about adolescent suicide. Method: GPs knowledge about adolescent suicide was assessed using the 39-item Adolescent Suicide Behaviour Questionnaire (ASBQ), distributed to all GPs listed on the Medical Practitioners Board register of the Australian state of Victoria. Forty-three percent of GPs ( n = 1694) completed and returned the survey. Results: GPs scored, on average, 71 percent of the questionnaire items correct. The mean level of incorrect and uncertain responses was 14 percent and 15 percent, respectively. However, there were wide differences in the number of correct scores between individual GPs, with some respondents scoring as few as four items correct and others as many as 38 items correct. Analysis of knowledge rates within ABSQ content domains showed that GPs were generally well informed about adolescent suicide in relation to precipitating factors, and less well informed about the remaining content domains. Conclusions: Australian GPs are, in general, moderately well informed, and are in a unique position to identify those at risk and to provide appropriate intervention (or referral). However, there is considerable variability in the accuracy of beliefs about adolescent suicide, with some GPs demonstrating excellent knowledge levels but others holding little accurate information. The extent of this variability in knowledge is a cause for concern. Findings highlight the need for ongoing education of GPs as an essential component of prevention strategies for youth suicide.
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Leonavičius, V. "Mokslo vieta kultūroje." Problemos 30 (October 1, 2014): 130–31. http://dx.doi.org/10.15388/problemos.1983.30.6442.
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1982 m. gruodžio 10 d. įvyko respublikinė konferencija „Metodologiniai pažinimo teorijos klausimai“, kurią organizavo VVU Filosofijos katedra. Konferencijoje daugiausia dėmesio buvo skirta mokslo vietos kultūroje klausimams – mokslo ir kultūros sampratos, mokslo ir religijos santykio, moksliškumo kriterijaus, faktų ir teorijos ryšio ir kitoms aktualioms problemoms. Pranešimus perskaitė R. Plečkaitis, J. Minkevičius, B. Genzelis, L. Karpovas, V. Rubavičius, E. Meškauskas, E. Nekrašas, S. Jankauskas ir kiti.
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Boswell, Donald L. "Rorschach EB as a Predictor of Imaging Style." Perceptual and Motor Skills 68, no. 3 (June 1989): 1001–2. http://dx.doi.org/10.2466/pms.1989.68.3.1001.
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60 university students were administered the Rorschach inkblot test and the Verbalizer-Visualizer Questionnaire (VVQ). No significant linear relationships were found between Rorschach scores involving human movement and color responses ( EB, M, Sum weighted C, and EA) and scores on the questionnaire. Also, no significant nonlinear relationship was found betwee Rorschach EB scores and scores on the questionnaire. Rorschach's hypothesis of a relationship between imagery types and Rorschach EB is brought into question.
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Fernández Rodicio, Clara Isabel. "Influencia de la imagen mental en el aprendizaje." Revista Iberoamericana de Educación 62, no. 1 (May 15, 2013): 1–8. http://dx.doi.org/10.35362/rie621888.
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Resumen
Una de las características principales de la enseñanza basada en competencias es que el alumno se vuelva un aprendiz autónomo. En esta investigación se desea averiguar la influencia de la viveza de imagen en el aprendizaje mediante formación de imágenes y el aprendizaje incidental asociativo con intervalos interpolados. Para ello se mide la viveza de imagen de los sujetos a través del cuestionario VVIQ de Marks. A continuación se confeccionó un cuestionario con una lista de palabras previamente valoradas en cuanto a su evocación de imagen y que se han seleccionado de dicho listado. Los alumnos se dividen en dos grupos y deben formar asociaciones con las palabras estímulo: unos con el aprendizaje mediante formación de imágenes y otros con el aprendizaje incidental asociativo con intervalos interpolados.
Palabras clave
viveza de imagen, aprendizaje asociativo, competencia.
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Auvinen-Lintunen, Laura, Maija Lindgren, Roope Tikkanen, and Tuula Ilonen. "Mental Imagery and Movement Responses to the Rorschach Test Among Young Violent Offenders." Rorschachiana 36, no. 2 (September 2015): 201–20. http://dx.doi.org/10.1027/1192-5604/a000070.
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Abstract. We studied the relationship between the self-reported mental imagery and movement responses in the Rorschach Comprehensive System (CS) in 26 young violent offenders. The modified version of the Vividness of Visual Imagery Questionnaire (VVIQ-method by Marks, 1972 , 1973 ) and the Rorschach CS were used. We found a positive association between the movement responses, especially human movement responses, and the ability to create and to control images. The violent offenders seemed to have an adequate ability to imagine future events and scenarios, but they had deficits in their situation specific mental imagery. The Rorschach Form Quality minus responses showed that the subjects’ ability to use mental imagery was inadequate; it was non-adaptive and the reality orientation vulnerable. We suggest that the causes of decreased imagery vividness and increased need to control mental images are negative emotions and intrusive ideations emerging in intimate relationships.
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Varga S., Katalin, and Katalin Varga. "Visual imaginative synchrony." Magyar Pszichológiai Szemle 67, no. 2 (June 1, 2012): 337–55. http://dx.doi.org/10.1556/mpszle.67.2012.2.5.
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Kutatásunkban az imaginatív tevékenység szinkronizációs folyamatának vizuális modalitását, az interakciós partnerek által átélt Vizuális Imaginatív Szinkront (rövidítve: VIS) vizsgáljuk. A VIS olyan interakciós szinkronjelenség, mely az egymásra hangolódás egy jellegzetes formáját, a képzeleti tevékenység külső megítélő által is azonosítható harmonizációját jelenti. A VIS operacionalizálási folyamata alkalmazható hipnózis és éber helyzetben egyaránt. A Vizuális Imaginatív Szinkron vizsgálatához standardizált eljárás segítségével inger-szavakat nyertünk. Az esetleges szinkronjelenségek megismeréséhez kialakítottuk a rajz és leírás együttesét alkalmazó VIS tesztet, melyet a diádok résztvevői minden egyes, interakciós helyzetenként 5 darab motívum után külön kitöltöttek. A VIS értékeket a diádok VIS tesztjeinek független megítélők hasonlóság alapján történő megítélésével határoztuk meg. A tanulmányban ismertetjük a standardizált keretek között zajló hipnózis és éber vizsgálati helyzetek eredményeit, illetve a VIS kapcsolatát további tesztekkel mért pszichológiai ismérvekkel (Képzeleti Tevékenység Kérdőív (VVIQ), Archaikus Bevonódási Skála (ABS), Phenomenology of Consciousness Inventory (PCI), Diádikus Interakciós Harmónia (DIH), Szemekből Olvasás Teszt (SZOT)). Az eredmények alapján kijelenthetjük, hogy egy új interakciós szinkronjelenséget azonosítottunk, mely megbízhatóan mérhető éber és hipnózis helyzetben egyaránt.
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Knowles, Laurence, Kealan Jones, and Adam Zeman. "#3112 Acquired aphantasia in 88 cases: a preliminary report." Journal of Neurology, Neurosurgery & Psychiatry 92, no. 8 (July 16, 2021): A6.3—A7. http://dx.doi.org/10.1136/jnnp-2021-bnpa.17.
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AimsFor most of us, visual imagery is a fundamental feature of day-to-day subjective experience. It is thought to play multiple cognitive roles.1 However, there is widespread variation in the subjective intensity of visual imagery, ranging from extreme vividness to complete absence. The term aphantasia was coined recently to describe the latter, which is usually lifelong. While rarer, cases of acquired aphantasia can provide mechanistic insight. Isolated cases have long been reported,2 with some attempts at theoretical synthesis.3 4 We give a preliminary description of 88 such cases identified from among ~14,000 people contacting us in the wake of publicity surrounding Aphantasia.MethodsCases were selected from individuals contacting us spontaneously reporting reduced or absent intensity of visual imagery. Contacts were asked to complete two measures of visual imagery, the Vividness of Visual Imagery Questionnaire (VVIQ) and Imagery Questionnaire (IQ).5ResultsCases were divided into those in with a strong probability of a neurological cause (n=39), a psychological cause (n=20) and those about which we cannot yet be confident (n=29). Functional aphantasia appears likely to account for some of the cases in the third category. The commonest precipitating events were head injury (n=19), affective disorder (n=17) and stroke (n=13). Other causes included surgery (postoperative) (n=7), drugs (n=6), infectious or inflammatory disease (n=3), neurodegenerative disease (n=3), and seizure disorders (n=2). For subjects completing the VVIQ (n=29), the mean score was 20.1/80 (range 16-32,) indicating marked reduction of imagery vividness. Localizable lesions were predominantly right sided (n=6) and occurred in posterior cortical areas, particularly occipital and parietal, as well as two cases associated with damage to temporal cortex. Some cases reported other impairments, including impaired memory (n=12), prosopagnosia (n=5) and navigational difficulties (n=2). Of cases who reported on their dreams (n=28), around half had lost visual dreaming, a third had preserved visual dreaming and the remainder had visual dreaming of reduced intensity.ConclusionsTo our knowledge, this is the largest reported case series of acquired loss of visual imagery. Both neurological and psychological disorders can be responsible for acquired aphantasia. Our series includes cases of probable functional aphantasia. Further detailed analysis of these cases is required.References Pearson. Nat. Rev. Neurosci. 2019;20:624634. Zago, et al. Cognit. Neuropsychiatry 2011;16:481504. Farah. Cognition 1984;18:245272. Bartolomeo. Cortex 2002;38:357378. Zeman, et al. Cortex 2020;130:426440.
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Balgiu, Beatrice Adriana, and Victor Adîr. "The associatıon between vividness and verbal and figural creativity." Global Journal of Psychology Research: New Trends and Issues 7, no. 1 (September 25, 2017): 2–7. http://dx.doi.org/10.18844/gjpr.v7i1.2430.
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Abstract
Research on creativity in the technical field considers that one specific skill in the domain is spatial visualization, seeing with the eyes of the mind. One of the essential characteristics of visualization with high value in creativity is vividness. Studies that took into consideration the implication of vividness in creativity show contradictory results. The present article analyses the vividness of visual imagery (using the Vividness of Visual Imagery Questionnaire - VVIQ) in verbal creativity (measured with “Unusual uses” test for creative thinking) and figural creativity (measured with Creative Mental Synthesis Tasks consisting in the mental assemblage of geometric figures). The correlational analysis shows a significant and positive, although moderate, connection between vividness and originality in creative mental synthesis tasks. There were no correlations between vividness and other parameters of verbal and figural creativity. Results make us believe that the role played by vividness in creativity is not as important as claimed by empirical studies or historical evidence provided by individuals who reported on the use of mental imagery in creativity.
Keywords: Vividness, mental imagery, verbal creativity, figural creativity.
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Suweken, Gede, I. Wayan Puja Astawa, and Putu Mirah Purnama Dewi. "Pengaruh Pendekatan Concrete Representational Abstract terhadap Literasi Matematis Ditinjau dari Gaya Kognitif Siswa." Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan 6, no. 3 (March 29, 2021): 402. http://dx.doi.org/10.17977/jptpp.v6i3.14620.
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<p class="Abstrak"><strong>Abstract:</strong> This study aims to examine the effect of applying the Concrete Representational Abstract (CRA) approach to mathematical literacy ability in the one variable linear equations system in terms of students’ cognitive styles. The data methods were test and questionnaire, test of mathematical literacy ability is used to collect students’ mathematical literacy ability and the VVQ questionnaire is used to collect students’ cognitive style. Furthermore, the data were analysed with two-way analysis of variance. The results of the analysis showed that the learning approach and cognitive style simultaneously had influenced the students' mathematical literacy. Mathematical literacy ability of students with verbalizer and visualizer cognitive style who followed learning with CRA learning approach were significantly higher than the mathematical literacy ability of students who followed conventional learning. In term of cognitive style, students with verbalizer cognitive style who followed learning with CRA learning approach had higher mathematical literacy ability than students with cognitive visualizer style who followed conventional learning.</p><strong>Abstrak:</strong> Penelitian ini bertujuan untuk menguji pengaruh metode pendekatan <em>Concrete Representational Abstract</em> (CRA) terhadap kemampuan literasi matematis pada materi persamaan linier satu variable dilihat dari gaya kognitif yang dimiliki oleh siswa. Metode yang dipakai adalah metode tes dan kuisioner, tes kemampuan literasi matematis dipakai untuk mengumpulkan kemampuan literasi siswa, dan kuisioner VVQ digunakan untuk mengumpulkan gaya kognitif siswa. Selain itu, data yang diperoleh dianalisis melalui analisis varian dua jalur. Hasil analisis menunjukkan pendekatan pembelajaran dan gaya kognitif secara simultan berpengaruh terhadap kemampuan literasi matematis siswa. Kemampuan literasi matematis siswa yang menggunakan metode CRA dalam mengikuti kelas lebih tinggi dibandingkan siswa yang belajar konvensional. Dari perspektif gaya kognitif, siswa yang mengadopsi gaya kognitif verbalizer yang mengikuti pembelajaran dengan pendekatan CRA memiliki keterampilan literasi matematika yang lebih tinggi daripada siswa yang memiliki alat visualisasi gaya kognitif yang menggunakan metode pembelajaran konvensional.
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Pérez-Fabello, María José, and Alfredo Campos. "Psychometric properties of the Spanish version of the Exercise Imagery Questionnaire (EIQ)." Cuadernos de Psicología del Deporte 20, no. 3 (July 22, 2020): 41–54. http://dx.doi.org/10.6018/cpd.375771.
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En este studio se evaluaron las propiedades psicométricas de la versión en español del Cuestionario de Imágenes de Ejercicio (EIQ) en un grupo de 166 ( 127 hombres y 39 mujeres ) estudiantes de de primer año de grado en Ciencias de la Actividad Física y del Deporte (Medad = 20.57, SD = 2,24). Los participantes realizaban ejercicio al menos 4 veces por semana. Además administramos la version Española de cuatro cuestionarios de imagen mental: MIQ-R, VMIQ, VVIQ, Gordon Test. Llevamos a cabo dos análisis confirmatorios del EIQ, en primer lugar, un modelo con tres factores (imagen de técnica, energía y apariencia) similar al original, aunque no cumplía los valores recomendados para un buen ajuste. Sin embargo, el ajuste del segundo modelo con dos factores (imagen de técnica y energía) fue bueno (CFI = .97, NNFI = .94, RMSEA = .07, SRMR = .04), con resultados similares a la prueba original. La fiabilidad medida a través del alfa de Cronbach fue acceptable pero la fiabilidad compuesta fue más baja de lo recommendable. La validez convergente y discriminate resultó adecuada. Encontramos una correlación significativa entre el EIQ técnica y el Gordon Test. También se incluyó una tabla de baremación del grupo estudiantes of Physical Activity and Sports Sciences. Los resultados se discutieron, y se observó que la version Española del EIQ es una prueba válida y útil para explorar, especialmente, dos tipos de imagen: técnica y energía. In this study, the psychometric properties of the Spanish version of the Exercise Imagery Questionnaire (EIQ) were evaluated in a sample of 166 first-year undergraduates of a Bachelor’s degree in Physical Activity and Sports Sciences, 127 men, and 39 woman; Mage = 20.57, SD = 2.24. Participants exercised at least 4 times a week. Moreover, the Spanish versions of four mental imagery questionnaires were administered: MIQ-R , VMIQ, VVIQ, and Gordon Test. Two confirmatory factor analyses of the EIQ were performed. First, a three-factor model (technique, energy, and appearance imagery) the same as the original model, failed to obtain the recommended values for a good fit. However, the second model adjusted to two factors (technique and energy imagery) was good (CFI = .97, NNFI = .94, RMSEA = .07, SRMR = .04) with results similar to the original test. Reliability was acceptable as measured by the Cronbach’s alpha, but composite reliability was lower than recommended. However, convergent and discriminant validity was inadequate. There was a significant correlation between the EIQ and the Gordon Test. Furthermore, Tables have been included as an aid the elucidation of the results of the sample of undergraduates on the Bachelor’s degree in Physical Activity and Sports Sciences. The results are discussed, and substantiated the Spanish version of the EIQ was a valid and useful test for exploring two types of imagery in particular: technique and energy. Neste estudo avaliamos as propriedades psicométricas da versão em espanhol do Exercise Image Questionnaire (EIQ). Participaram 166 (127 homens e 39 mulheres) alunos do primeiro ano de uma licenciatura em Atividade Física e Ciências do Desporto (Midade = 20.57, SD = 2,24). Os participantes exercitaram-se pelo menos 4 vezes por semana. Além disso, administramos a versão em espanhol de quatro questionários de imagem mental: MIQ-R, VMIQ, VVIQ, Gordon Test. Foram realizadas duas análises confirmatórias do EIQ, primeiro um modelo com três fatores (imagem técnica, energia e aparência), exatamente como o original, embora não se atendesse aos valores recomendados para um bom ajuste. No entanto, o ajuste do segundo modelo com dois fatores (técnica e imagem energética) foi bom (CFI = .97, NNFI = .94, RMSEA = .07, SRMR = .04) com resultados semelhantes ao teste original. A confiabilidade medida através do alfa de Cronbach foi aceitável, mas a confiabilidade composta foi menor que o recomendado. A validade convergente e discriminada foi adequada. Houve uma correlação significativa entre o EIQtécnica e o teste de Gordon. Também foi incluída uma tabela de escala do grupo de estudantes de Atividade Física e Ciências do Desporto. Os resultados foram discutidos, e observou-se que o EIQ é um teste válido e útil para explorar, principalmente, dois tipos de imagem: técnica e energia.
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Chumairoh, Luluk, Ana Rahmawati, and Tafsillatul Mufida Asriningsih. "Analisis Pengajuan Soal Matematika Siswa Ditinjau dari Gaya Kognitif Visualizer dan Verbalizer." JRPM (Jurnal Review Pembelajaran Matematika) 7, no. 1 (June 30, 2022): 102–12. http://dx.doi.org/10.15642/jrpm.2022.7.1.102-112.
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Problem posing in this research asks students to make questions. One of the internal factors that affect the ability of students in posing problems was student cognitive style. The purpose of this study, describe the student's mathematical problem posing in terms of the visualizer and verbalizer cognitive styles. This type of research was qualitative research. Research instruments were the VVQ (Visualizer and Verbalizer Questionnaire) test, problem-posing test, and interview guidelines. The results of this study were that the visualizer subject posed more problems from visual information than verbal information, all the problems made were categorized as assignment propositions, and only contained one semantic relation. Meanwhile, the verbalizer subject makes the number of questions the same between verbal and visual information, the problems made were categorized as assignment propositions and categorized as conditional propositions, and all problems contain only one semantic relation.
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Szczerbal, I., J. Nowacka-Woszuk, M. Racka, J. Klukowska-Roetzler, C. Schelling, G. Dolf, and M. Switonski. "Cytogenetic mapping and STR polymorphism of two candidate genes (<i>DRD2</i> and <i>HTR1D</i>) for behaviour traits in four canids (short communication)." Archives Animal Breeding 50, no. 4 (October 10, 2007): 412–17. http://dx.doi.org/10.5194/aab-50-412-2007.
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Abstract. The dopamine D2 receptor (DRD2) and serotonin receptors 1D (HTR1D) are candidate genes for behavioural traits. In the present study, we show chromosomal location and polymorphism of these genes in four species from the family Canidae: dog (CFA), red fox (VVU), arctic fox (ALA) and the Chinese raccoon dog (NPP). Using fluorescence in situ hybridisation (FISH) the DRD2 gene was localized in the following chromosomes: CFA5q12-13, VVU12q21, ALA10q14 and NPP3q14 and the HTR1D gene was mapped to: CFA2q25, VVU2q22, ALA8q25 and NPP10q25. A microsatellite marker (TG)n in intron 3 of the DRD2 gene and (CA)n motif located in a 3’-flanking region of the HTR1D gene were polymorphic in all studied species. The obtained results can be helpful in further studies on effects of polymorphisms of these genes on behaviour traits in canids.
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Ilma, Rosidatul, A. Saepul Hamdani, and Siti Lailiyah. "Profil Berpikir Analitis Masalah Aljabar Siswa Ditinjau dari Gaya Kognitif Visualizer dan Verbalizer." Jurnal Review Pembelajaran Matematika 2, no. 1 (June 16, 2017): 1–14. http://dx.doi.org/10.15642/jrpm.2017.2.1.1-14.
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This research aimed to describe the profile of the visualizer and verbalizer students to think analytically in solving mathematical problems. The subjects were 3 visualizer students and 3 verbalizer students obtained by VVQ questionnaire. The research data are the form of analytical thinking tests and interviews were then analyzed based on the indicators of analytical thinking in solving mathematical problems based on the stage Polya. The results obtained by the visualizer students mention known and asked by picture, modelize problem by picture, use any different strategies, and conclude by picture. In other hand, verbalizer students mention known and asked by words, modelize problem by word (symbol or alphabet), use same strategy, and conclude by words. In the final result, there is no difference ability between the visualizer and verbalizer students' cognitive style to think analytically in solving the problem because both are quite good.
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Jelinek, Lena, Sarah Randjbar, Michael Kellner, Angnes Untiedt, Jana Volkert, Christoph Muhtz, and Steffen Moritz. "Intrusive Memories and Modality-Specific Mental Imagery in Posttraumatic Stress Disorder." Zeitschrift für Psychologie / Journal of Psychology 218, no. 2 (January 2010): 64–70. http://dx.doi.org/10.1027/0044-3409/a000013.
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Posttraumatic stress disorder (PTSD) is characterized by vivid intrusive memories of the trauma. Among these, visual sensations of the trauma are most commonly reported. However, intrusions may involve other senses as well (e.g., acoustic, olfactory, or bodily sensations). It has been proposed that enhanced mental imagery may predispose individuals with traumatic experiences to intrusions and ultimately to PTSD. A total of 58 victims of interpersonal violence with current (n = 20), past (n = 19), and no lifetime PTSD (n = 19) as well as non-traumatized controls (n = 23) were assessed with the Vividness of Visual Imagery Questionnaire (VVIQ) and a modality-specific imagery questionnaire. Moreover, the sensory quality of the traumatic intrusions was assessed in traumatized participants. Participants with recovered PTSD displayed less overall mental imagery than the other three groups who were indistinguishable. No relation was found between the modality-specific mental imagery and the sensory quality of the intrusions. The impact of mental imagery on intrusive memories in PTSD is complex. Less mental imagery appears beneficial in the recovery process, but does not prevent the development of intrusive symptoms in the first place. Further investigation of perceptual and memory vividness as well imagery control (i.e., to sustain, modify, or terminate an image) also including trauma-related material may be important for trauma-specific interventions.
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Fatri, Fergi Faranijza, Maison Maison, and Syaiful Syaiful. "Kemampuan Representasi Matematis Siswa Kelas VIII SMP Ditinjau dari Gaya Kognitif Visualizer dan Verbalizer." Jurnal Didaktik Matematika 6, no. 2 (October 6, 2019): 98–111. http://dx.doi.org/10.24815/jdm.v6i2.14179.
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Mathematical representation skill is students' ability to express mathematical ideas (such as problems, statements, and definitions) in various ways to solve problems through multiple representations, such as images, words, tables, and symbols mathematics. Students are struggling in representing mathematical ideas. It hampers them in determining the solution of mathematical problems. They are careless in reading the word problems, lacking problem analysis, less thorough, and struggling to connect concepts. The subjects of this study were in two students from one of the junior high school in Jambi. The instruments used for this research were VVQ, Mathematical Representation Ability Test and interviews. This study used a descriptive qualitative method. The results showed that the representation abilities of students with visualizer and verbalizer style were quite good. However, each subject had a different way of solving problems. Visualizers were more interested in questions with image information in solving the problem. Verbalizer tended to prefer information with detailed wording.
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Amilia, Nabilla Dihni, and Endah Budi Rahaju. "Kemampuan Berpikir Analitis Siswa SMA Pada Pemecahan Masalah Matematika Ditinjau Dari Gaya Kognitif Visualizer dan Verbalizer." MATHEdunesa 11, no. 2 (May 10, 2022): 404–18. http://dx.doi.org/10.26740/mathedunesa.v11n2.p404-418.
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Abstrak
Penelitian ini bertujuan untuk mendeskripsikan kemampuan berpikir analitis siswa SMA pada pemecahan masalah matematika ditinjau dari gaya kognitif visualizer dan verbalizer, sehingga jenis penelitian yang digunakan adalah deskriptif kualitatif. Instrumen dalam penelitian ini yaitu angket (Visualizer and Verbalizer Questionnaire (VVQ)), tes kemampuan matematika, tes berpikir analitis, dan pedoman wawancara. Subjeknya adalah satu siswa bergaya kognitif visualizer dan satu siswa bergaya kognitif verbalizer. Tehnik pengumpulan data yang digunakan adalah tes kemampuan matematika, tes berpikir analitis, dan wawancara. Data yang terkumpul selanjutnya dianalisis dengan metode reduksi data, penyajian data, dan kesimpulan. Hasil penelitian menunjukkan bahwa siswa visualizer dan verbalizer pada tahap memahami masalah melakukan aktivitas kognitif berupa membedakan dan mengorganisasi, pada tahap membuat dan melaksanakan rencana, kedua siswa melakukan aktivitas kognitif berupa mengorganisasi dan memberikan atribut, langkah penyelesaian yang dilakukan kedua siswa sesuai dengan rencana yang disusun, siswa visualizer mengilustrasikan ide penyelesaian dengan panah dan menulisnya secara ringkas, siswa verbalizer menuliskan ide tersebut secara terstruktur dan jelas, pada tahap melihat kembali, siswa visualizer melakukan aktivitas kognitif berupa mengorganisasi dan memberikan atribut, sedangkan siswa verbalizer melakukan aktivitas kognitif berupa memberikan atribut.
Kata kunci: Kemampuan, berpikir analitis, pemecahan masalah, visualizer dan verbalizer
Abstract
This study aims to describe the analytical thinking skills of high school students in solving mathematical problems in terms of visualizer and verbalizer cognitive styles, so the type of research used is descriptive qualitative. Instruments in this research are questionnaire (Visualizer and Verbalizer Questionnaire (VVQ)), mathematical ability test, analytical thinking test, and interview guide. The subject is one student with cognitive visualizer style and one student with cognitive verbalizer style. The data collection techniques used were mathematical ability tests, analytical thinking tests, and interviews. The collected data was analyzed with data reduction, data presentation, and conclusion. The results showed visualizer and verbalizer students at the stage of understanding the problem perform cognitive activities namely distinguishing and organizing, at the stage of making and implementing plans, both students perform cognitive activities namely organizing and assigning attributes, the completion steps were perform by both students according to the plans drawn up, students visualizer illustrates the idea of completion with arrows and writes it briefly, verbalizer students write down the idea in a structured and clear manner, at the stage of looking back, visualizer students perform cognitive activities namely organizing and assigning attributes, while verbalizer students perform cognitive activities namely of giving attributes.
Keywords: Ability, analytical thinking, problem-solving, visualizer and verbalizer
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Varga S., Katalin, and Katalin Varga. "The concept of Visual Imaginative Synchron and the preliminary results in its operalization." Magyar Pszichológiai Szemle 64, no. 2 (June 1, 2009): 359–84. http://dx.doi.org/10.1556/mpszle.64.2009.2.4.
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Kutatásunkban az imaginatív tevékenység szinkronizációs folyamatának vizuális modalitását, az interakciós partnerek által átélt Vizuális Imaginatív Szinkront (rövidítve: VIS ) vizsgáljuk. A VIS olyan interakciós szinkronjelenség, mely az egymásra hangolódás egy jellegzetes formáját, a képzeleti tevékenység külső megítélő által is azonosítható harmonizációját jelenti. A VIS operacionalizálási folyamata alkalmazható hipnózis és éber szituációkban egyaránt. A Vizuális Imaginatív Szinkron vizsgálatához standardizált eljárás segítségével eltérő dimenziók mentén közepesen szóró verbális motívumokat nyertünk. Az átélt képek közötti esetleges szinkronjelenségek megismeréséhez kialakítottuk a rajz és leírás együttesét alkalmazó VIS tesztet. A standardizált keretek között zajló, egy-másfél órát igénybe vevő éber vizsgálatok során öt vizsgálati motívum kapcsán töltötték ki az interakciós felek a VIS tesztet, illetve a következőket: Képzeleti Tevékenység Kérdőív (VVIQ), Archaikus Bevonódási Skála (ABS), Phenomenology of Consciousness Inventory (PCI), Diádikus Interakciós Harmónia Kérdőív (DIH), Szemekből Olvasás Teszt (SZOT). A diádok ( n = 48) VIS tesztjeinek hasonlóság alapján történő megítélésében optimális operacionalizálási eljárásnak a csoportos megítélés bizonyult, ahol minden egyes megítéltetési helyzetről három független megítélő alkotott véleményt, egy helyszínen, egymás választását nem ismerve. A megítélők saját preferenciájuk, személyiségük, beállítódásuk alapján döntöttek. A magas VIS-diád pontszámokat három új független megítélővel retesztben újramértük. A diádok 22,92%-nál találtunk reliábilisan megítélhető szinkront. A validitás vizsgálatok a VIS-nek a PCI Pozitív Érzelmek Alskálájával és a DIH Összhang Alskálájával való összefüggésére utalnak éber interakció esetén. Eredményeink alapján kijelenthetjük, hogy a VIS standardizált éber vizsgálati helyzetben külső megítélők által megbízhatóan azonosítható.
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Lee, Sukwon, Bum Kwon, Jiming Yang, Byung Lee, and Sung-Hee Kim. "The Correlation between Users’ Cognitive Characteristics and Visualization Literacy." Applied Sciences 9, no. 3 (January 31, 2019): 488. http://dx.doi.org/10.3390/app9030488.
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One of the ultimate goals of studies on visualization literacy is to improve users’ visualization literacy through education and training. Even though users’ cognitive characteristics may significantly affect learning and responding processes in general, studies have addressed the relationships between users’ cognitive characteristics and visualization literacy. As a first step toward discovering the relationships, we conducted an empirical study to investigate the correlation between cognitive characteristics and visualization literacy. Our first study focuses on testing the correlation between visualization and three cognitive characteristics: numeracy, need for cognition, and visualizer-verbalizer style. In this study, we measured 178 participants’ visualization literacy and the level of the three cognitive characteristics using the Visualization Literacy Assessment Test (VLAT), the Decision Research Numeracy Test (DRNT), the Need for Cognition Scale (NCS), and the Verbalizer-Visualizer Questionnaire (VVQ) through a crowdsourcing experiment. Our test results confirmed that a correlation exists between visualization literacy and both numeracy and need for cognition. Based on our test results, we discuss the implications for education to enhance visualization literacy and future studies to investigate on related user characteristics.
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Samuel, Ameyaw, Afua Frempong-Kore, and Bitherman Benedicta Krampah Akoto. "An Albatross On the Neck: Social Media Use and Its Effects on Students’ Academic Performance in Ghana: A Comparative Study." International Journal of Library and Information Science studies 8, no. 2 (February 15, 2022): 35–52. http://dx.doi.org/10.37745/ijliss.15/vol8n23552.
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This study aimed to examine social media usage and its effects on students' academic performance. The study adopted a survey design approach. The population for this study consisted of undergraduate students from two universities, thus, one private university (Valley View University – VVU) in Techiman in the Bono Region and one public university (Ghana Communications Technology University) in Takoradi, in the Western Region. The study used 5% of the population to arrive at a sample size of 381. The stratified and simple random sampling techniques were applied to select the students. A well–structured questionnaire was used as a data collection instrument. The study established that social media had negatively affected their English writing skills, which is detrimental to their academic performance. The results showed that most students visited social media platforms daily and spent more time on these platforms. The study identified challenges like; lack of personal security and privacy, poor internet services, unreliable power, the cost of internet connectivity, and many others. The study made recommendations to the management of both universities to organise workshops and seminars and educate students on the dangers of excessive use of social media platforms.
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Yi, Huiming, Xinwu Cui, Baohuan Cai, Liru Qiu, Pengfei Song, and Wei Zhang. "A quantitative grading system of vesicoureteral reflux by contrastenhanced voiding urosonography." Medical Ultrasonography 22, no. 3 (September 5, 2020): 287. http://dx.doi.org/10.11152/mu-2311.
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Aims: Contrast-enhanced voiding urosonography (ceVUS) is a well-established imaging modality for the diagnosis of vesicoureteral reflux (VUR). However, discrepancies of grading diagnosis of VUR exist due to the qualitative grading criteria currently used in clinics. This study aimed to evaluate numerical markers for a quantitative VUR grading system.Material and methods: CeVUS images of grade II-VVUR were analysed. A quantitative indicator, i.e. sectional area ratio (SAR), on the imaging section with maximum cross-section area and the presence of kidney hilum was calculated to distinguish different grades of VUR. The diagnostic performance of SAR was evaluated using receiver operating characteristic curve (ROC) analysis, and the maximum Youden Index was used to determine the optimal cut-off values.Results: A total of 63 patients with 126 PelviUreteral Units were enrolled. The SAR value increased significantly along with the increase of VUR grade. SAR had an excellent diagnostic performance in grading VUR. For differentiating VUR of grade II vs III, III vs IV and IV vs V, the area under the ROC curve values of SAR were 0.967, 0.943 and 0.865, respectively, while the optimal SAR cut-off values were 14.3%, 34.9% and 51.0%, respectively. The quantitative grading system based on the optimal SAR cut-off values showed excellent consistency with the qualitative grading system of VUR currently used in clinic.Conclusions: The numerical indicator SAR calculated from ceVUS may be used to establish a quantitative VUR grading system with excellent diagnostic performance and can potentially serve as a reliable tool for the evaluation and follow-up of VUR.
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Faradillah, Ayu, and Annisa Maulida. "Students' creative thinking ability assisted augmented reality based on visualizer-verbalizer cognitive style." Jurnal Elemen 8, no. 2 (July 1, 2022): 659–74. http://dx.doi.org/10.29408/jel.v8i2.5693.
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Creativity is the highest order of thinking, which leads students to generate new ways to find a solution to many unpredictable problems in the future. Although there are many studies on creative thinking ability, no research focused on augmented reality and visualizer-verbalizer cognitive style in creative thinking ability. This study aims to describe creative thinking ability assisted with augmented reality view from visualizer-verbalizer cognitive style. This study used a qualitative descriptive approach. The subjects of this study were selected four students' 52 from the 10th grade. The process of selecting this subject was analyzed by the Rasch Model analysis using Winsteps software version 3.73. The data were collected using Visualizer-Verbalizer Questionnaire (VVQ), a creative thinking ability test assisted with augmented reality and interview. The final scale from the visualizer scale has a Cronbach alpha value of 0.67, while the verbalizer scale has a Cronbach alpha value of 0.66. The results show that the visualizer students meet all the indicators of creative thinking ability: fluency, flexibility, originality, and elaboration. While the verbalizer students only meet fluency indicators or fluency and originality indicators in creative thinking ability. Therefore, based on this research analysis, teachers can pay more attention to the students' cognitive style in creative thinking ability.
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Menni, Younes, A. Chamkha, Chafika Zidani, and Boumédiène Benyoucef. "Baffle orientation and geometry effects on turbulent heat transfer of a constant property incompressible fluid flow inside a rectangular channel." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 6 (May 29, 2019): 3027–52. http://dx.doi.org/10.1108/hff-12-2018-0718.
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Purpose A computational fluid dynamics (CFD) analysis has been carried out on the aerodynamic and thermal behavior of an incompressible Newtonian fluid having a constant property and flowing turbulently through a two-dimensional horizontal high-performance heat transfer channel with a rectangular cross section. The top surface of the channel was kept at a constant temperature, while it was made sure to maintain the adiabatic condition of the bottom surface. Two obstacles, with different shapes, i.e. flat rectangular and V-shaped, were inserted into the channel; they were fixed to the top and bottom surfaces of the channel in a periodically staggered manner to force vortices to improve the mixing and consequently the heat transfer. The first fin-type obstacle is placed on the heated top channel surface, and the second baffle-type one is placed on the insulated bottom surface. Five different obstacle situations were considered in this study, which are referred as cases FF (flat fin and flat baffle), FVD (flat fin and V-downstream baffle), FVU (flat fin and V-upstream baffle), VVD (V-downstream fin and V-downstream baffle) and VVU (V-Upstream fin and V-upstream baffle). Design/methodology/approach The flow model is governed by Reynolds-averaged Navier–Stokes equations with the k-epsilon turbulence model and the energy equation. These governing equations are discretized by the finite volume method, in two dimensions, using the commercial CFD software FLUENT software with the Semi Implicit Method for Pressure Linked Equations (SIMPLE) algorithm for handling the pressure-velocity coupling. Air is the test fluid with the flow rate in terms of Reynolds numbers ranging from 12,000 to 32,000. Findings Important deformations and large recirculation regions were observed in the flow field. A vortex causes a rotary motion inside the flow field, which enhances the mixing by bringing the packets of fluid from the near-wall region of the channel to the bulk and the other way around. The largest value of the axial variations of the Nusselt number and skin friction coefficient is found in the region facing the baffle, while the smallest value is in the region near the fin, for all cases. The thermal enhancement factor (TEF) was also introduced and discussed to assess the performance of the channel for various obstacle situations. It is found that the TEF values are 1.273-1.368, 1.377-1.573, 1.444-1.833, 1.398-1.565 and 1.348-1.592 for FF, FVD, FVU, VVD and VVU respectively, depending on the Re values. In all cases, the TEF was found to be much larger than unity; its maximum value was around 1.833 for FVU at the highest Reynolds number. Therefore, the FVU may be considered as the best geometrical configuration when using the obstacles to improve the heat transfer efficiency inside the channel. Originality/value This study can be a real application in the field of shell-and-tube heat exchangers and flat plate solar air collectors.
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Ameyaw, Samuel. "Distance Education Students’ Perception of Online Learning during Covid-19 Era: A Study of Selected Campuses and Learning Centres of Valley View University." University of Dar es Salaam Library Journal 17, no. 2 (January 18, 2023): 115–30. http://dx.doi.org/10.4314/udslj.v17i2.8.
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The aim of this study is to determine distance education students’ perceptions of online learning during the COVID-19 era. The descriptive design was employed to examine students' views on online learning. The population of the study was 876 students from all the campuses and learning centres of Valley View University (VVU) across the country. The Yamane (1967) sample size calculation formula was used to sample the respondents. The questionnaire was the only data collection instrument used in this study. The researcher sent copies of the questionnaire to the participants via Google forms. The IBM- Statistical Product and Service Solutions (IBM-SPSS) was used for the analysis. The study found that the perceptions of the majority of the students toward online learning were negative. The results revealed that smartphones were ranked first with a value of (RII = 0.659) as the devices used by students during online learning classes. The findings indicated that students found it difficult to access internet services when they were at home, with a value of (RII= 0.644). The study concluded that these findings have the potential to assist University Management in addressing all issues confronting distance learning students. It is suggested that the University's Administration should work with the various telecommunication networks to provide distance learning students with free internet data while they are at home to enable them to fully participate in online learning classes.
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Stojković, Anja, Aleksandra Kostić, and Monika Gluvačević. "POVEZANOST FENOMENA AFANTAZIJA SA PREFERENCIJOM KA ODREĐENIM FILMSKIM ŽANROVIMA." ГОДИШЊАК ЗА ПСИХОЛОГИЈУ 17, no. 1 (December 28, 2020): 71–85. http://dx.doi.org/10.46630/gpsi.17.2020.05.
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Aphantasia is a recently identified condition which is defined as the inability to create mental imagery. This study aimed to examine whether the level of mental imagery of respondents can be predicted based on the preference of the movie genre and to explore whether there are statistically significant differences between respondents who prefer different movie genres in terms of aphantasia. The sample consisted of 925 respondents (M= 187, F= 738). Age range in the sample was from 18 to 85 (M = 31.13; SD = 10.93). The aphantasia was operationalized through VVIQ (Vividness of Visual Imagery Questionnaire), the Instrument for Measuring Favorite Movie Genres, made for the purpose of this research was also used. Data processing was performed on the overall score of aphantasia, as well as on separate scales of open and closed eyes, and after that on a subsample of men and women, but the results were not statistically significant in any case. Both aphantasia scales of open (α = 0.874) and closed eyes (α = 0.936) show high internal consistency reliability. The results show that the phenomenon of aphantasia cannot be predicted based on the preferences of movie genres (F(6, 918) = 0.91, p = .489, R2 = .006), as well as that there are no statistically significant differences in aphantasia between respondents who prefer different film genres (F (5/919) = 0.16, p = .976). By the method of multiple linear regression of the opposite direction, we obtained that aphantasia can statistically significantly predict only the preferences of the Comedy genre (F(2, 922) = 4.67, p =.010; R2 = .010) with β = -.12; p = .003. Since different results are obtained in the reverse order, based on aphantasia we can predict preferences for movie genres to a certain extent, which could speak in favor of previously done researches that claimed aphantasia is congenital.
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Олейник, А. С., Т. А. Якунина, Э. И. Тагирова, А. В. Зыкова, and Л. А. Щербаева. "Analysis of external factors affecting the cybersecurity of a higher military educational institution." Management of Education, no. 5(51) (June 30, 2022): 221–30. http://dx.doi.org/10.25726/c8003-8216-5580-l.
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Сейчас в России наблюдается активное внедрение ИКТ в образовательно-научную деятельность высших учебных заведений, в том числе и военных вузов (ВВУЗ). Соответственно, внедрение ИКТ в НЕМ является предпосылкой для большого потенциала изменений консервативных подходов относительно ежедневного обучения военнослужащих, что обусловлено его доступностью, мобильностью и эффективностью. В частности, 27 июня 2017 года состоялась кибератака с использованием вредоносного программного обеспечения Petya, что повлекло нарушение функционирования государственных предприятий, учреждений, банков и медиа. Аналогично ухудшила состояние кибербезопасности в государстве – пандемия COVID-19. Так, вузы вынуждены были перейти на дистанционное обучение. С одной стороны, это ускорило внедрение ИКТ, а с другой – повысило угрозы в отношении кибератак со стороны злоумышленников, что опубликовано в соответствующих исследованиях ученых. Обусловлено это неготовностью и отсутствием в вузах практики по обеспечению кибербезопасности образовательно-научной деятельности в условиях удаленной работы. Now in Russia there is an active introduction of ICT in the educational and scientific activities of higher educational institutions, including military universities (VVUZ). Accordingly, the introduction of ICT in IT is a prerequisite for a large potential for changes in conservative approaches regarding the daily training of military personnel, which is due to its accessibility, mobility and efficiency. In particular, on June 27, 2017, a cyberattack using malicious Petya software took place, which caused disruption of the functioning of state-owned enterprises, institutions, banks and media. Similarly, the COVID–19 pandemic worsened the state of cybersecurity in the state. Thus, universities were forced to switch to distance learning. On the one hand, this accelerated the introduction of ICT, and on the other hand, increased the threat of cyber attacks from intruders, which is published in relevant research by scientists. This is due to the unavailability and lack of practice in universities to ensure the cybersecurity of educational and scientific activities in the conditions of remote work.
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Aprilianda, Nikmatus Savira, and Susanah Susanah. "PROFILE OF STUDENTS’ MATHEMATICAL CONNECTION ABILITY IN SOLVING MATHEMATICS PROBLEMS BASED ON VISUALIZER AND VERBALIZER COGNITIVE STYLE." MATHEdunesa 11, no. 2 (March 21, 2022): 328–40. http://dx.doi.org/10.26740/mathedunesa.v11n2.p328-340.
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Mathematical connection ability is the ability of students to connect mathematical ideas and concepts in a structured way to solve various problems both inside and outside mathematics. Mathematical connection ability plays an important role in the process of solving mathematical problems. Cognitive style is one of the factors that effect mathematical connection abilities. This research is a qualitative descriptive study that aims to describe the students' mathematical connection skills with visualizer and verbalizer cognitive styles in solving mathematics problems. The research subjects consisted of two grade IX students who each had visualizer and verbalizer cognitive styles. The instrument used was the researcher herself, VVQ (visualizer verbalizer questionnaire), a mathematical connection ability test, and interview guidelines. In this study, the material of plane area and Pythagorean theorem are used for test mathematical connection skills. The results obtained are students with visualizer cognitive style get a good category for their mathematical connection ability in solving mathematics problems because they meet seven good indicators and one sufficient indicator from the mathematical connection ability in solving problems indicator, while students with verbalizer cognitive style get sufficient categories because they meet three good indicators, four sufficient indicators, and one less indicator from mathematical connection ability in solving problems indicator. Therefore, teachers are expected to be able to train students with questions in the context of everyday life that have a higher level of mathematical connection so that they can improve their connection skills and also train with variety exercices presentation so student with each cognitive style can be trained to understand a given problem.
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Bobrova, R. Yu. "Justification of military professional competences required by graduate officers." Professional education in the modern world 12, no. 1 (April 30, 2022): 125–33. http://dx.doi.org/10.20913/2618-7515-2022-1-15.
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Introduction. The current international geopolitical situation and modern technical level of weapons, military and special equipment of the Armed Forces of the Russian Federation place high demands on gr aduates of higher military educational institutions (vvuz), on which the defense capability of our Motherland, the strength and power of its army directly depends. Therefore, the training of officers is one of the most important priority areas of military construction of the Russian army. An important role in this matter belongs to the military professional training of young officers, the readiness of graduates of higher education institutions for future service in the military, military administration bodies, educational and research organizations, the formation of their responsible and interested attitude to their work. The successful solution of the problem of military vocational training of graduates of higher education institutions is possible with the help of a competent approach set out in the Federal State Educational Standards of Higher Professional Education of the third generation (FGOS)Problem statement. The main objective of this work is to substantiate the military-professional competencies received by cadets during their studies at higher education institutions.Methodology of the study. In the course of this study, methods of analysis and synthesis were used, a set of measures was carried out, including collection, comparison, generalization, ranking, formulation, targeting.Results. Based on the results of the work carried out, the most important military professional competencies of future officers were substantiated. Graduates of higher military education institutions should be able to conduct combat training classes with subordinates; organize the daily service activities of subordinates; ensure the safety of military service of subordinates; ensure the strengthening of military discipline in a subordinate military unit.Conclusions. The article considers and substantiates the definitions of “competence” and “competency”, “professional competence of military personnel”, which most accurately correspond to the modern educational paradigm that is based on personality-oriented learning and competence-based approach, currently implemented in the Russian education system. The conclusions are formulated based on the results of consideration and analysis of these terms. In addition, based on the analysis and synthesis of the content of the current FGOS for higher professional education and the requirements for the training of specialists of the Military Training and Scientific Center of the Air Force “Professor N. E. Zhukovsky and Yu. A. Gagarin Air Force Academy”, as well as relying on the results of an expert survey of corresponding relevant categories of the permanent staff of the Air Force and representatives military units, a number of relevant military-professional competencies were substantiated, which it is advisable to form among officers-graduates of the higher military educational institution. The results obtained in the work can be applied not only in higher military education institutions, but also in edu cational institutions of other departments.
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Pankevich, Yaroslav, and Vyacheslav Afonin. "IMPROVEMENT PROGRAM PHYSICAL TRAINING OF STUDENTS ENGINEERING DEPARTMENTS." Sports Bulletin of the Dnieper 1 (2020): 381–91. http://dx.doi.org/10.32540/2071-1476-2019-1-381.
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One of the important branches of the Armed Forces of Ukraine is the engineering troops, the units of which are always present in the organization and conduct of combat operations. The servicemen of these units do a great job of fortifying combat positions, building barriers and obstacles, masking and covering military positions with mine explosive devices, arranging water crossings, helping in organizing shelters for manpower and equipment. The theory and especially the practice of military engineers show the need to improve not only theoretical knowledge, skills and practical skills, but also to have a high level of development of general and special physical qualities. Among the many studies of physical fitness of cadets of different military specialties, there is a lack of studies of engineering cadets. The research carried out earlier concerned mainly the operator specialties of the engineering troops. Military mechanical engineers and command personnel have not been investigated at all. The purpose and objectives of the research are aimed at finding ways to improve the level of physical and psychophysiological readiness of cadets of the Higher Educational Institutions of Higher Education - future specialists of the engineering profile and determining the influence of the author's program of physical training on their professional readiness. The research methods used included theoretical methods (analysis and generalization of literary sources), pedagogical (observation, testing, experiment), methods of mathematical statistics for processing experimental data and assessing reliability. During the academic year, 60 cadets of the National Academy of Ground Forces (mechanical engineers and commander engineers) took part in the study, divided into experimental and control groups by the method of paired comparisons. The experimental group performed a specially developed physical training program with the inclusion of applied exercises. As a result of one-year training following the results of control tests, cadets of the experimental group have significantly better indicators of psychophysiological, physical (especially strength) and professional training than cadets of the control group at the level of p <0.05. Conclusions. It has been determined that for mechanical engineers and commanders for their professional activities, good strength training is important. Sense of temporal, power and spatial parameters in all subjects is approximately at the same level. EG cadets significantly improved the results of physical and psychophysiological fitness. It was found that the existing program of physical training at VVUZ does not sufficiently contribute to the high-quality special training of engineering cadets. The proposed content of exercises and the scheme of distribution of loads for a week and a month can be used to develop programs for special physical training for specific engineering specialties. Key words: military engineers, special physical training, temporary, power, spatial sense.
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Nguyen, Xuan Tong, Thi Thu Huong Tran, Thi Thuy Duong, Huong Mai, Trong Khang Duong, Cong Luc Huynh, Thi Loan Pham, and Thi Phuong Quynh Le. "Bioaccumulation of organochlorine pesticides (OCPs) in molluscs and fish at the Sai Gon - Dong Nai estuary." Journal of Vietnamese Environment 9, no. 5 (August 9, 2018): 248–54. http://dx.doi.org/10.13141/jve.vol9.no5.pp248-254.
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The aim of this study is to assess the biological accumulation of pesticide residues in aquatic organisms in Sai Gon - Dong Nai (SG-DN) estuary. Fish and mollusks were collected directly at the Soai Rap and Long Tau estuary of the SG-DN river system, washed and separated for taking the tissue. The organochlorine compounds from the tissue were then extracted and analyzed by gas chromatography system. The results showed that, the concentration of OCPs in Tegillarca granosa, Meretrix lyrata, Margaritifera auricularia and Bostrychus sinensis varied from 6.4 to 59.9 μg/kg, 7.2 to 322 μg/kg, 4.5 to 62.1 μg/kg and 2.9 to 114.3 μg/kg fresh weight, respectively. In general, molluscs species that accumulate more heptachlor, aldrin, endrin or dieldrin tend to accumulate less DDT (dichlorodiphenyltrichloroethane). Endosulfan was the most commonly found in three bivalve mollusks while DDTs (1.5–75.2 μg/kg, averaging 8.7 μg/kg weight) was the most popular OCPs in the fish (Bostrychus sinensis) samples. In DDT group, the p,p’-DDT metabolite accounted for the largest percentage, reaching 50% of total DDTs. In HCH (Hexachlorocyclohexane) group, β-HCH isomer was predominant in almost samples.
Mgr đích ccc nghiên cch này là đánh giá tích lũy sinh hhn ccn thuu trr sâu trong các sinh vvn ssnh dưưh nưưh ttư khu vvu ccu sông Sài Gòn - ĐĐn Nai (SG-DN). Cá và nhuyyu thh đưưy llư trry tiiy iicửa sông Soài RRà và Lòng Tàu thuu hh thhu sông SG-DN, đư-D rư- ss-D và tách llc phhh mô thht. Các hhc chh clo hho cơ sau đó đưưđ tách chii và phân tích bbch hh thhh ssh ký khí. Kết quả nghiên cứu cho thấy, dư lượng OCPs tích tụ trong sò điệp (Tegillarca granosa), ngao (Meretrix lyrata), trai nước ngọt (Margaritifera auricularia) và cá bớp (Bostrychus sinensis) dao động tương ứng từ 6,4 đến 59,9 μg/kg, 7,2 đến 322 μg/kg, 4,5 đến 62,1 μg/kg và 2,9 đến 114,3 μg/kg trọng lượng tươi. Nhìn chung, loài nhuyễn thể nào tích lũy nhiều heptachlor, aldrin, endrin hoăc dieldrin có xu hướng tích lũy ít DDT (Dichlorodiphenyltrichloroethane). Endosunfan là nhóm thuốc được tìm thấy nhiều nhất trong các loài nhuyễn thể nghiên cứu. Ngược lại, nhóm DDT lại phổ biến ở cá Bostrychus sinensis (1,5–75,2 μg/kg, trung bình 8,7 μg/kg trọng lượng). Dạng p.p’-DDT trong nhóm DDT chiếm tỷ lệ cao nhất, tới 50% DDT tổng. Trong khi đó, đồng dạng β-HCH của nhóm HCH (Hexachlorocyclohexane) chiếm đa số trong hầu hết các mẫu.
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Schroeder, Benjamin B., Kenneth T. Hu, Joshua G. Mullins, and Justin G. Winokur. "Summary of the 2014 Sandia Verification and Validation Challenge Workshop." Journal of Verification, Validation and Uncertainty Quantification 1, no. 1 (February 19, 2016). http://dx.doi.org/10.1115/1.4032563.
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A discussion of the five responses to the 2014 Sandia Verification and Validation (V&V) Challenge Problem, presented within this special issue, is provided hereafter. Overviews of the challenge problem workshop, workshop participants, and the problem statement are also included. Brief summations of teams' responses to the challenge problem are provided. Issues that arose throughout the responses that are deemed applicable to the general verification, validation, and uncertainty quantification (VVUQ) community are the main focal point of this paper. The discussion is oriented and organized into big picture comparison of data and model usage, VVUQ activities, and differentiating conceptual themes behind the teams' VVUQ strategies. Significant differences are noted in the teams' approaches toward all VVUQ activities, and those deemed most relevant are discussed. Beyond the specific details of VVUQ implementations, thematic concepts are found to create differences among the approaches; some of the major themes are discussed. Finally, an encapsulation of the key contributions, the lessons learned, and advice for the future are presented.
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Nagaraja, Srinidhi, Galyna Loughran, Anup Gandhi, Jason Inzana, Andrew P. Baumann, Kumar Kartikeya, and Marc Horner. "Verification, Validation, and Uncertainty Quantification of Spinal Rod Computational Models Under Three-Point Bending." Journal of Verification, Validation and Uncertainty Quantification 5, no. 1 (March 1, 2020). http://dx.doi.org/10.1115/1.4046329.
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Abstract Verification, validation, and uncertainty quantification (VVUQ) can increase confidence in computational models by providing evidence that a model accurately represents the intended reality of interest. However, there are currently few examples demonstrating the application of VVUQ best practices for medical devices. Therefore, the objectives of this study were to understand the reproducibility and repeatability of experimental testing and finite element analysis (FEA), perform VVUQ activities that guide the development and refinement of a finite element model, and document best practices for future research. This study focused on experiments and simulations of three-point bend testing, which is a fundamental element of a hierarchical validation study of medical devices (e.g., spinal rod-screw systems). Experimental three-point bend testing was performed at two laboratories using medical-grade titanium (Ti-6Al-4V) spinal rods. FEA replicating the experimental test was performed by four independent institutions. Validation activities included comparing differences in mechanical properties between FEA and experimental results, where less than 10% difference was observed for all quantities of interest. Computational model uncertainties due to modeling assumptions and model input parameters were estimated using the sensitivity coefficient method. An importance factor analysis showed that rod diameter was the parameter driving uncertainty in the initial elastic region, while the material model is the primary contributor beyond this point. These results provide a proof of concept in the use of VVUQ for the use of FEA for medical device applications.
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Luk, O. O., J. Lakhlili, O. Hoenen, U. von Toussaint, B. D. Scott, and D. P. Coster. "Towards validated multiscale simulations for fusion." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 379, no. 2197 (March 29, 2021). http://dx.doi.org/10.1098/rsta.2020.0074.
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Harnessing energy produced by thermonuclear fusion reactions has the potential to provide a clean and inexpensive source of energy to Earth. However, throughout the past seven decades, physicists learned that creating our very own fusion energy source is very difficult to achieve. We constructed a component-based, multiscale fusion workflow to model fusion plasma inside the core of a tokamak device. To ensure the simulation results agree with experimental values, the model needs to undergo the process of verification, validation and uncertainty quantification (VVUQ). This paper will go over the VVUQ work carried out in the multiscale fusion workflow (MFW), with the help of the EasyVVUQ software library developed by the VECMA project. In particular, similarity of distributions from simulation and experiment is explored as a validation metric. Such initial validation measures provide insights into the accuracy of the simulation results. This article is part of the theme issue ‘Reliability and reproducibility in computational science: implementing verification, validation and uncertainty quantification in silico ’.