Recognizing and Drawing IC-planar Graphs

IC-planar graphs are those graphs that admit a drawing where no two crossed edges share an end-vertex and each edge is crossed at most once. They are a proper subfamily of the 1-planar graphs. Given an embedded IC-planar graph $G$ with $n$ vertices, we present an $O(n)$-time algorithm that computes a straight-line drawing of $G$ in quadratic area, and an $O(n^3)$-time algorithm that computes a straight-line drawing of $G$ with right-angle crossings in exponential area. Both these area requirements are worst-case optimal. We also show that it is NP-complete to test IC-planarity both in the general case and in the case in which a rotation system is fixed for the input graph. Furthermore, we describe a polynomial-time algorithm to test whether a set of matching edges can be added to a triangulated planar graph such that the resulting graph is IC-planar

Assessing Creativity: A Test for Drawing Production using Digital Art Tools The concept, application and assessment of digital art teaching as a means of enhancing creative proficiency

This paper describes the Test for Creative Thinking - Drawing Production (TCT-DP), including its design, concept and mode of assessment, and the practical consequences of its application in a specific context. The test was used to evaluate the performance of groups of students as part of a case study exploring the use of digital art tools for drawing in a junior school. The students used specific digital art software via both computers and tablets, and also drew manually using a variety of devices. TCP-DP evaluates drawing production by means of a set of 14 criteria. At the same time, this study used the Technology Acceptance Model (TAM) theory to assess the ease of use and usefulness of the digital tools. The test was trialled with students aged 9-10 years in different ability groups. There were no significant differences in performance between male and female participants. Details of various related studies, together with data concerning the reliability and validity of the TCT-DP test, are also provided. The study finds that motivation is an important factor in improving young people’s artistic ability

Attribution styles as correlates of technical drawing task-persistence and technical college students’ performance

Technical drawing is a means of communicating between the designer and the manufacturers to bring ideas into reality by means of drafting. This study investigated attribution styles as collates of students’ technical drawing task-persistence and academic performance using correlational research design. The population for this study consisted of 864 students of year II and the sample study comprised of 150 (93 males and 57 females) randomly selected from six technical colleges in Edo State, Nigeria. Three instruments, Academic Performance Attribution Style Questionnaire (APASQ), Technical Drawing Taskpersistent Rating Scale (TDTPRS); and Technical Drawing Performance Test (TDPT) were developed and used for data collection. Cronbach Alpha reliability method was used to determine the reliability of the instruments and the results were obtained: SAASQ = .87; TDTPRS=.79; AND TDAT = .85. The findings of the study revealed that the technical drawing task-persistence of students was positively correlated by functional attribution style; and was negatively correlated by dysfunctional attribution style; functional attribution style positively correlated academic performance of students. Based on the findings of the study, it was recommended among others that technical drawing teachers should model and teach the students the right attribution style that will enhance their learning of technical drawing

Warm Deep Drawing of Aluminium Sheet

Aluminium sheet drawing processes can be improved by manipulating local flow behaviour\ud by means of elevated temperatures and temperature gradients in the tooling. Forming tests\ud showed that a substantial improvement is possible not only for 5xxx but also for 6xxx series\ud alloys. Finite element method simulations can be a powerful tool for the design of warm\ud forming processes and tooling. Their accuracy will depend on the availability of materials\ud models that are capable of describing the influence of temperature and strain rate on the flow\ud stresses. Two models, an adapted Nadai power law and a dislocation based Bergström type\ud model, are compared by means of simulations of a cup drawing process. Experimental\ud drawing test data are used to validate the modelling approaches, whereas the model parameters\ud follow from tensile tests

Hypotheses testing on infinite random graphs

Drawing on some recent results that provide the formalism necessary to definite stationarity for infinite random graphs, this paper initiates the study of statistical and learning questions pertaining to these objects. Specifically, a criterion for the existence of a consistent test for complex hypotheses is presented, generalizing the corresponding results on time series. As an application, it is shown how one can test that a tree has the Markov property, or, more generally, to estimate its memory

LOX/GOX mechanical impact tester assessment

The performances of three existing high pressure oxygen mechanical impact test systems were tested at two different test sites. The systems from one test site were fabricated from the same design drawing, whereas the system tested at the other site was of different design. Energy delivered to the test sample for each test system was evaluated and compared. Results were compared to the reaction rates obtained

How does a bicycle work? A new instrument to assess mechanical reasoning in school aged children

This study demonstrated that a brief interview can reveal the mechanical reasoning that could not be assessed via the Bicycle Drawing Test. This study, conducted on 190 children (6 to 11 years old), shows that mechanical reasoning improves with age. It shows correlations with spatial reasoning and motor control, and with visual reasonin

Clock face drawing test performance in children with ADHD

 Introduction: The utility and discriminatory pattern of the clock face drawing test in ADHD is unclear. This study therefore compared Clock Face Drawing test performance in children with ADHD and controls.   Material & methods: 95 children with ADHD and 191 school children were matched for gender ratio and age. ADHD symptoms severities were assessed using DSM-IV ADHD checklist and their intellectual functioning was assessed. The participants completed three clock-drawing tasks, and the following four functions were assessed: Contour score, Numbers score, Hands setting score, and Center score    Results: All the subscales scores of the three clock drawing tests of the ADHD group were lower than that of the control group. In ADHD children, inattention and hyperactivity/impulsivity scores were not related with free drawn clock test scores. When pre-drawn contour test was performed, inattentiveness score was statistically associated with Number score. None of the other variables of age, gender, intellectual functioning, and hand use preference were associated with Numbers score. In pre-drawn clock, no association of ADHD symptoms with any CDT subscales was significant. In addition, more errors are observed with free drawn clock and Pre-drawn contour than pre-drawn clock.    Conclusion: Putting Numbers and Hands setting are more sensitive measures to screen ADHD than Contour and Center drawing. Test performance, except Hands setting, may have already reached a developmental plateau. It is probable that Hand setting deficit in children with ADHD may not decrease from age 8 to 14 years. Performance of children with ADHD is associated with the complexity of CDT

Assessing Creativity: A Test for Drawing Production using Digital Art Tools

This paper describes the Test for Creative Thinking - Drawing Production (TCT-DP), including its design, concept and mode of assessment, and the practical consequences of its application in a specific context. The test was used to evaluate the performance of groups of students as part of a case study exploring the use of digital art tools for drawing in a junior school. The students used specific digital art software via both computers and tablets, and also drew manually using a variety of devices. TCP-DP evaluates drawing production by means of a set of 14 criteria. At the same time, this study used the Technology Acceptance Model (TAM) theory to assess the ease of use and usefulness of the digital tools. The test was trialled with students aged 9-10 years in different ability groups. There were no significant differences in performance between male and female participants. Details of various related studies, together with data concerning the reliability and validity of the TCT-DP test, are also provided. The study finds that motivation is an important factor in improving young people’s artistic ability