1,720,974 research outputs found
ZigBee performance in 400 kv air insulated power substation
No full textAn experimental assessment of the impact of the electromagnetic environment of a 400 kV substation on the performance of ZigBee equipment is described. The experimental assessment includes a pragmatic field trial and a laboratory test. The laboratory test, in which all external noise and interference are excluded, is used as a control. A simple set of metrics are used to compare the performance of ZigBee equipment deployed in the substation with that deployed in a controlled laboratory environment. The results based on more than 1.6 Gbit of transmitted data show no significant adverse impact of the substation electromagnetic environment on the performance of ZigBee equipment
Effects of Online MCQ Tests on Student Learning
No full textGetting students to understand the concepts of a technically sound subject - Business Data Communication and Networks, done by non-technical (i.e. business) students was the challenge. A set of Multiple Choice Questions (MCQ), around 40 to 50 of them per chapter were posted on the subject Blackboard as online MCQ tests that the students could take at their own pace, after a chapter is finished. They were encouraged to do it as a part of their learning exercise though no marks were given for it. Once they complete the test, they could see the answers and the mistakes they made, through immediate feedbacks. There were eight students who participated. The MCQ sets were posted online in two sessions. In session 1, MCQs for the first four chapters were posted. Later, their understanding of concepts was checked through a mid-semester test, covering these four chapters. In the second session, MCQs for the next seven chapters were posted and their understanding was tested through a final examination, covering these seven chapters. The output graphs of the assessment scores show generally, that the students who did the MCQ tests well, performed well in mid-semester test and final exam too. Those who did badly comparatively in MCQs, fared poorly in mid-semester test and final exam as well. Some exceptions were there, where some student(s) who did a bit of hard work through MCQs, did not perform that well (but not very badly too) in the test or exam. A regression analysis is done between MCQ test results and the mid-semester test and final exam. Quantitative and qualitative analyses done on a brief survey conducted with the students confirmed the effects of the observed learning process, through the use of online MCQs. This could very well be extended to large classes
Innovative Techniques in Instruction Technology, E-learning, E-assessment, and Education
Full text linkUma Balaji is a contributing author, Demonstrations of Transmission Line Effects.
Book description:
Innovative Techniques in Instruction Technology, E-Learning, E-Assessment and Education is a collection of world-class paper articles addressing the following topics:
E-Learning including development of courses and systems for technical and liberal studies programs; online laboratories; intelligent testing using fuzzy logic; evaluation of on line courses in comparison to traditional courses; mediation in virtual environments; and methods for speaker verification.
Instruction Technology including internet textbooks; pedagogy-oriented markup languages; graphic design possibilities; open source classroom management software; automatic email response systems; tablet-pcs; personalization using web mining technology; intelligent digital chalkboards; virtual room concepts for cooperative scientific work; and network technologies, management, and architecture.
Science and Engineering Research Assessment Methods including assessment of K-12 and university level programs; adaptive assessments; auto assessments; assessment of virtual environments and e-learning.
Engineering and Technical Education including cap stone and case study course design; virtual laboratories; bioinformatics; robotics; metallurgy; building information modeling; statistical mechanics; thermodynamics; information technology; occupational stress and stress prevention; web enhanced courses; and promoting engineering careers.
Pedagogy including benchmarking; group-learning; active learning; teaching of multiple subjects together; ontology; and knowledge representation.
Issues in K-12 Education including 3D virtual learning environment for children; e-learning tools for children; game playing and systems thinking; and tools to learn how to write foreign languages.https://digitalcommons.fairfield.edu/engineering-books/1034/thumbnail.jp
Perspectives on critical thinking through online discussion forums in engineering mathematics
No full textFailure of a Rigidly Framed Concrete Parking Structure Due to Thermally Induced Earth Pressure
Full text linkAn instrumentation program was undertaken to monitor the movements of a multi-story underground parking-structure exhibiting signs of large deformation and severe structural distress including the failure of a column. The structure is a four-story reinforced concrete building with a rectangular footprint measuring 52.42 m by 71.32 m. The building’s structural system consists of reinforced concrete waffle slabs supported by rectangular reinforced-concrete columns. The instrumentation plan included the installation of eight vibrating-wire displacement transducers to monitor displacements, and twenty-four electrolytic tiltmeters to monitor inclinations. The instrument data was recorded hourly and read via a remote site modem connected to a datalogger for three years. Measurements indicate that earth pressure against rigidly framed structures, subject to wide temperature variations, is largely dependent on seasonal variation of temperature and the structural stiffness of the building. A summary of the instrumentation program and a brief interpretation of typical measurements are presented, along with a discussion of lessons learned and recommendations for similar projects
Selection of mill cutter and cutting parameters through an expert system
No full textThis paper discusses the selection of tools in milling operations. An expert system hinged on numerical methods has been developed to carry out this research. The knowledge base is given by limitations in process variables, which let us define the allowable cutting parameter space. The mentioned process variables cause instabilities due to tool-work-piece interaction, knowing as chatter vibration, and the power available in the spindle motor. Then, a tool cost model is contrived. It is used to choose the suitable cutting tool, among a known set of candidate available cutters. Once the cutting tool is selected, the cutting parameters are calculated. For this purpose, other two cost functions are designed, which are depended on the time and frequency domains response properties. An example is presented to illustrate the method
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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