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Journal articles on the topic 'Video- based tests'
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Pardo-Ballester, Cristina. "El uso del vídeo en tests de comprensión oral por internet." Journal of New Approaches in Educational Research 5, no. 2 (July 15, 2016): 91–98. http://dx.doi.org/10.7821/naer.2016.7.170.
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<p class="AbstractText">With sophisticated multimedia technology, there is a renewed interest in the relationship between visual and auditory channels in assessing listening comprehension (LC). Research on the use of visuals in assessing listening has emerged with inconclusive results. Some learners perform better on tests which include visual input (Wagner, 2007) while others have found no difference in the performance of participants on the two test formats (Batty, 2015). These mixed results make it necessary to examine the role of using audio and video in LC as measured by L2 listening tests. The current study examined the effects of two different types of listening support on L2 learners’ comprehension: (a) visual aid in a video with input modified with redundancy and (b) no visuals (audio-only input) with input modified with redundancy. The participants of this study included 246 Spanish students enrolled in two different intermediate Spanish courses at a large Midwestern university who participated in four listening tasks either with video or with audio. Findings of whether the video serves as a listening support device and whether the course formats differ on intermediate-level Spanish learners’ comprehension will be shared as well as participants’ preferences with respect to listening support.</p>
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Liu, Bo, Jiandong Liu, Shuhong Wang, Ming Zhong, Bo Li, and Yujie Liu. "HEVC Video Encryption Algorithm Based on Integer Dynamic Coupling Tent Mapping." Journal of Advanced Computational Intelligence and Intelligent Informatics 24, no. 3 (May 20, 2020): 335–45. http://dx.doi.org/10.20965/jaciii.2020.p0335.
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A selective encryption algorithm is proposed to improve the efficiency of high efficiency video coding (HEVC) video encryption and ensure the security of HEVC videos. The algorithm adopts the integer dynamic coupling tent mapping optimization model as the pseudo-random sequence generator, and multi-core parallelization is used as the sequence generation mechanism. The binstrings during the process of context adaptive binary arithmetic coding are selected for encryption, which conforms to the features of invariable binstream and compatible format in terms of video encryption. Performance tests for six types of standard videos with different resolutions were performed. The results indicated that the encryption algorithm has a large key space and benefits from a high encryption effect.
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Wali, Ibtissem, Amina Kessentini, Mohamed Ali Ben Ayed, and Nouri Masmoudi. "DSP TMS320C6678 Based SHVC Encoder Implementation and its Optimization." International Journal of Recent Technology and Engineering (IJRTE) 10, no. 5 (January 30, 2022): 24–31. http://dx.doi.org/10.35940/ijrte.e6656.0110522.
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The programmable processors newest technologies, as for example the multicore Digital Signal Processors (DSP), offer a promising solution for overcoming the complexity of the real time video encoding application. In this paper, the SHVC video encoder was effectively implemented just on a single core among the eight cores of TMS320C6678 DSP for a Common Intermediate Format (CIF)input video sequence resolution(352x288). Performance optimization of the SHVC encoder had reached up 41% compared to its reference software enabling a real-time implementation of the SHVC encoder for CIF input videos sequence resolution. The proposed SHVC implementation was carried out on different quantization parameters (QP). Several experimental tests had proved our performance achievement for real-time encoding on TMS320C6678.
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Lesnov, Roman Olegovich. "Content-Rich Versus Content-Deficient Video-Based Visuals in L2 Academic Listening Tests." International Journal of Computer-Assisted Language Learning and Teaching 8, no. 1 (January 2018): 15–30. http://dx.doi.org/10.4018/ijcallt.2018010102.
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This article compares second language test-takers' performance on an academic listening test in an audio-only mode versus an audio-video mode. A new method of classifying video-based visuals was developed and piloted, which used L2 expert opinions to place the video on a continuum from being content-deficient (not helpful for answering comprehension items) to content-rich (very helpful for answering comprehension items). The video for one testlet contained only the speaker's non-verbal cues and was found to be content-deficient. The other video contained non-verbal cues overlapping with PowerPoint text and was deemed content-rich. Seventy-three ESL learners participated in the study. The video type classification method was shown to be reliable and practical. The results of the Rasch analysis showed no significant impact of condition, either the content-deficient or the content-rich, either at the testlet level or at the item level. Possible reasons and implications of these findings are discussed.
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Munro Cullum, C., L. S. Hynan, M. Grosch, M. Parikh, and M. F. Weiner. "Teleneuropsychology: Evidence for Video Teleconference-Based Neuropsychological Assessment." Journal of the International Neuropsychological Society 20, no. 10 (October 24, 2014): 1028–33. http://dx.doi.org/10.1017/s1355617714000873.
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AbstractThe use of videoconference technology to deliver health care diagnostics and treatment continues to grow at a rapid pace. Telepsychiatry and telepsychology applications are well-accepted by patients and providers, and both diagnostic and treatment outcomes have generally been similar to traditional face-to-face interactions. Preliminary applications of videoconference-based neuropsychological assessment (teleneuropsychology) have yielded promising results in the feasibility and reliability of several standard tests, although large-scale studies are lacking. This investigation was conducted to determine the reliability of video teleconference (VTC) - based neuropsychological assessment using a brief battery of standard neuropsychological tests commonly used in the evaluation of known or suspected dementia. Tests included the Mini-Mental State Examination (MMSE), Hopkins Verbal Learning Test-Revised, Digit Span forward and backward, short form Boston Naming Test, Letter and Category Fluency, and Clock Drawing. Tests were administered via VTC and in-person to subjects, counterbalanced using alternate test forms and standard instructions. Two hundred two adult subjects were tested in both rural and urban settings, including 83 with cognitive impairment and 119 healthy controls. We found highly similar results across VTC and in-person conditions, with significant intraclass correlations (mean=.74; range: 0.55–0.91) between test scores. Findings remained consistent in subjects with or without cognitive impairment and in persons with MMSE scores as low as 15. VTC-based neuropsychological testing is a valid and reliable alternative to traditional face-to-face assessment using selected measures. More VTC-based studies using additional tests in different populations are needed to fully explore the utility of this new testing medium. (JINS, 2014, 20, 1–6)
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Sellberg, Charlott. "Pedagogical dilemmas in dynamic assessment situations: perspectives on video data from simulator-based competence tests." WMU Journal of Maritime Affairs 19, no. 4 (June 30, 2020): 493–508. http://dx.doi.org/10.1007/s13437-020-00210-2.
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AbstractThis study investigates navigation instructors’ explanations of dynamic assessment practices during simulator-based competency tests, adopting a video-stimulated recall method. Episodes of authentic video materials from simulator-based competency tests are selected and subjected to interaction analysis. In the next step, the episodes are used for conducting stimulated recall interviews with navigation instructors (n = 11) in two focus groups. The results reveal the dynamic nature of assessing competence as well as how instructors participating in focus groups identified and critically discussed a variety of pedagogical dilemmas related to these dynamics. These are related to aspects that relate to what constitutes a valid exam question, how to assess students’ responses, and consistency and fairness of competence tests. In particular, the results indicate the complexity of conducting valid and reliable assessments of knowledge-in-action in situ as well as how thoughtful scenario designs could reduce inconsistencies and unequal treatment of students. The results also highlight how a repeated and collaborative viewing of videos was helpful for instructors to identify potential problems in the dynamic assessment situations they viewed. The implications of the results highlight the need for conducting high-stake assessments for maritime certificates based only on observable behavior and video records of competence tests rather than during ongoing simulator tests. Lastly, the need for continuous and structured pedagogical development of instructors is identified in order to support their complex work of training and assessing competence.
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Kalakoti, Gowrisankar, and Prabakaran G. "Key-Frame Detection and Video Retrieval Based on DC Coefficient-Based Cosine Orthogonality and Multivariate Statistical Tests." Traitement du Signal 37, no. 5 (November 25, 2020): 773–84. http://dx.doi.org/10.18280/ts.370509.
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This paper presents a method, which is developed based on the Discrete Cosine (DC) coefficient and multivariate parametric statistical tests, such as tests for equality of mean vectors and the covariance matrices. Background scenes and forefront objects are separated from the key-frame, and the salient features, such as colour and Gabor texture, are extracted from the background and forefront components. The extracted features are formulated as a feature vector. The feature vector is compared to that of the feature vector database, based on the statistical tests. First, the feature vectors are compared with respect to covariance. If the feature vector of the key-frame and the feature vector of the feature vector database pass the test, then the test for equality of mean vector is performed; otherwise, the testing process is stopped. If the feature vectors pass both tests, then it is inferred that the query key-frame represents the target video in the video database. Otherwise, it is concluded that the query key-frame not representing the video; and the proposed system takes the next feature vector for matching. The proposed method results in an average retrieval rate of 97.232%, 96.540%, and 96.641% for CC_WEB, UCF101, and our newly constructed database, respectively. Further, the mAP scores computed for each video datasets, which resulted in 0.807, 0.812, and 0.814 for CC_WEB, UCF101, and our newly constructed database, respectively. The output results obtained by the proposed method are comparable to the existing methods.
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Murphy, Louise, Stephen Moore, Joan Swan, Davida Hehir, and John Ryan. "Examining the impact of video-based outpatient education on patient demand for a rheumatology CNS service." British Journal of Nursing 30, no. 18 (October 14, 2021): 1056–64. http://dx.doi.org/10.12968/bjon.2021.30.18.1056.
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Background: Patient demand for education and access to the clinical nurse specialists (CNSs) during the rheumatology clinic at one hospital in Ireland was increasing. Alternative methods of providing patient education had to be examined. Aims: To explore the efficacy of video-based outpatient education, and its impact on demand for the CNSs. Methods: A video was produced to play in a rheumatology outpatient department. A representative sample of 240 patients (120 non-exposed and 120 exposed to the video) attending the clinic was selected to complete a questionnaire exploring the effect of the video. Data were analysed using chi-square tests with Yates' continuity correction. Findings: Demand for the CNSs was six times higher in the non-exposed group compared with the exposed group (non-exposed: 25%, exposed: 4.8%) (χ2=15.7, P=0.00007), representing a significant decrease in resource demand. Conclusion: High-quality educational videos on view in the rheumatology outpatient department provide patients with information sufficient to meet their educational needs, thus releasing CNS resources.
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Murphy, Louise, Stephen Moore, Joan Swan, Davida Hehir, and John Ryan. "Examining the impact of video-based outpatient education on patient demand for a rheumatology CNS service." British Journal of Nursing 30, no. 18 (October 14, 2021): 1056–64. http://dx.doi.org/10.12968/bjon.2021.30.18.1056.
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Background: Patient demand for education and access to the clinical nurse specialists (CNSs) during the rheumatology clinic at one hospital in Ireland was increasing. Alternative methods of providing patient education had to be examined. Aims: To explore the efficacy of video-based outpatient education, and its impact on demand for the CNSs. Methods: A video was produced to play in a rheumatology outpatient department. A representative sample of 240 patients (120 non-exposed and 120 exposed to the video) attending the clinic was selected to complete a questionnaire exploring the effect of the video. Data were analysed using chi-square tests with Yates' continuity correction. Findings: Demand for the CNSs was six times higher in the non-exposed group compared with the exposed group (non-exposed: 25%, exposed: 4.8%) (χ2=15.7, P=0.00007), representing a significant decrease in resource demand. Conclusion: High-quality educational videos on view in the rheumatology outpatient department provide patients with information sufficient to meet their educational needs, thus releasing CNS resources.
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Si, Zhan Jun, Fei Yuan, and Yong Guang Zhao. "Design of Android-Based YUV Video Player." Applied Mechanics and Materials 731 (January 2015): 248–52. http://dx.doi.org/10.4028/www.scientific.net/amm.731.248.
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This article elaborates the color space and sampling format of the YUV. By calling SDL, a YUV video player is designed based on Android. The research uses two video testing sequences provided by VQEG. The player is debugged on a Sony Tablet which has the Android OS. Having done some tests, the result shows that the sequences run smoothly via this app. At the end of the article, some future implication of the YUV player has been discussed and the study also serves as a basis for the development of android-based video quality assessment platform.
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Hamood, Laith Abdulhussien, and Mahmood Khalel Ibrahem. "Video Encryption Based on Chaotic System and Stream Cipher." Iraqi Journal of Information & Communications Technology 1, no. 2 (July 27, 2018): 33–40. http://dx.doi.org/10.31987/ijict.1.2.19.
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the huge development and use of digital multimedia (video, image) over computer networks has led to increase the need for securing of these digital data. Video encryption is widely used as a method for providing security for digital video. In this paper video encryption method is developed using chaotic system for key generator and stream cipher, it uses chaotic map as one-time key generator which produce key used for encryption process. Chaotic systems have been successfully used for multimedia encryption. Chaotic cryptography have good characteristic such as pseudo-randomness, and sensitivity to initial conditions. Video encryption method have successfully designed and implemented, the tests and analysis results have showed the succeed of the encryption method in term of speed and security.
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Menggo, Sebastianus, Agnetis Basir, and Yustus Sentus Halum. "Video-Based Tasks in Strengthening Speaking Skills of EFL College Students." Indonesian Journal of EFL and Linguistics 7, no. 2 (November 25, 2022): 279. http://dx.doi.org/10.21462/ijefl.v7i2.510.
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All teachers, including speaking instructors, should be able to select the proper interactive media for students' speaking practice. Video-assisted learning tasks in the speaking class have not been explored extensively, despite the reality that video-based tasks are an appropriate choice for students to enhance their speaking ability. This study sought to examine the Effect of video-based tasks on students' speaking skills. In this study, a quasi-experimental design was employed, and the speaking scoring rubric served as the research instrument. Both the experimental group and the control group were comprised of participants. Researchers gave pre-and post-tests to identify the impact of the video-based tasks technique on students' speaking skills. Using a simple random sampling technique, 56 students from the English study program in the first grade at Universitas Katolik Indonesia Santu Paulus Ruteng comprised the research sample; then, the data were analyzed by using a t-test with the assistance of the SPSS 24.0 program. The data analysis of the average student score in the experimental and control groups revealed that the experimental group's average score (80,29) was higher than the control group's average score (67,57). This result demonstrates the significant effects of video-based tasks in teaching speaking. The researchers concluded that video-based tasks were helpful for teaching speaking skills. Moreover, video-based tasks significantly impact students' ICT skills, learning independence, and self-evaluation development. The logical implication of this study's findings is that EFL teachers should use videos to teach English, particularly speaking skills, because it has been demonstrated to have a favorable effect on the respondents' speaking ability.
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Singh, Raahat Devender, and Naveen Aggarwal. "Optical Flow and Prediction Residual Based Hybrid Forensic System for Inter-Frame Tampering Detection." Journal of Circuits, Systems and Computers 26, no. 07 (March 17, 2017): 1750107. http://dx.doi.org/10.1142/s0218126617501079.
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In the wake of widespread proliferation of inexpensive and easy-to-use digital content editing software, digital videos have lost the idealized reputation they once held as universal, objective and infallible evidence of occurrence of events. The pliability of digital content and its innate vulnerability to unobtrusive alterations causes us to become skeptical of its validity. However, in spite of the fact that digital videos may not always present a truthful picture of reality, their usefulness in today’s world is incontrovertible. Therefore, the need to verify the integrity and authenticity of the contents of a digital video becomes paramount, especially in critical scenarios such as defense planning and legal trials where reliance on untrustworthy evidence could have grievous ramifications. Inter-frame tampering, which involves insertion/removal/replication of sets of frames into/from/within a video sequence, is among the most un-convoluted and elusive video forgeries. In this paper, we propose a potent hybrid forensic system that detects inter-frame forgeries in compressed videos. The system encompasses two forensic techniques. The first is a novel optical flow analysis based frame-insertion and removal detection procedure, where we focus on the brightness gradient component of optical flow and detect irregularities caused therein by post-production frame-tampering. The second component is a prediction residual examination based scheme that expedites detection and localization of replicated frames in video sequences. Subjective and quantitative results of comprehensive tests on an elaborate dataset under diverse experimental set-ups substantiate the effectuality and robustness of the proposed system.
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Xu, Yan, Chunlai Li, Shijie Liu, Guoliang Tang, Jianan Xie, and Jianyu Wang. "A Snapshot Imaging Spectrometer Based on Uniformly Distributed-Slit Array (UDA)." Sensors 22, no. 9 (April 21, 2022): 3206. http://dx.doi.org/10.3390/s22093206.
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Herein, we propose a system for a snapshot video hyperspectral imaging method based on a uniformly distributed-slit array (UDA) coding plate that not only effectively improves the scanning speed of spectrometers but also achieves a high spectral fidelity of snapshot videos. A mathematical model and optical link simulation of the new system are established. The analysis results show that the proposed method can more efficiently collect information and restore the spectral data cube, and the spectral smile of the system is less than 4.86 μm. The results of the spectral performance and external imaging tests of the system show that the system has the ability to collect spatial spectrum video information with a frame rate of 10 Hz and identify dynamic targets, laying a foundation for the design of a system with a higher frame rate and resolution.
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Telaumbanua, Luckyani Gulo, Noveri Amal Jaya Harefa, and Imansudi Zega. "Development of Indonesian Language Learning Videos Based on a Scientific Approach to Poetry Materials." Edumaspul: Jurnal Pendidikan 6, no. 2 (October 1, 2022): 2121–28. http://dx.doi.org/10.33487/edumaspul.v6i2.4521.
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The purpose of this research is to develop an Indonesian language learning video based on a scientific approach that is feasible, practical and effective. This type of research is development research using the ADDIE model consisting of analysis, design, development, implementation, and evaluation. The types of data obtained in this study are quantitative and qualitative data. The research instruments used in this development research are validation sheets, practicality questionnaires for learning videos, and learning outcomes tests for assessing the effectiveness of learning videos. The research results show that learning videos developed based on the Scientific approach are feasible, practical, and effective to use to meet the research's expectations or objectives. Thus, the researchers suggest, namely: 1) Indonesian language education subject teachers at SMA Negeri 1 Gunungsitoli can use this learning video as one of the learning media to improve the quality of learning and as a learning strategy. 2) make the results of this research as additional knowledge in utilizing IT. Further researchers should use this researcher as additional insight in carrying out research.
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Zhang, Ruiling, and Shengwu Xiong. "A Novel Mobile Video Community Discovery Scheme Using Ontology-Based Semantical Interest Capture." Mobile Information Systems 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/5279425.
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Leveraging network virtualization technologies, the community-based video systems rely on the measurement of common interests to define and steady relationship between community members, which promotes video sharing performance and improves scalability community structure. In this paper, we propose a novel mobile Video Community discovery scheme using ontology-based semantical interest capture (VCOSI). An ontology-based semantical extension approach is proposed, which describes video content and measures video similarity according to video key word selection methods. In order to reduce the calculation load of video similarity, VCOSI designs a prefix-filtering-based estimation algorithm to decrease energy consumption of mobile nodes. VCOSI further proposes a member relationship estimate method to construct scalable and resilient node communities, which promotes video sharing capacity of video systems with the flexible and economic community maintenance. Extensive tests show how VCOSI obtains better performance results in comparison with other state-of-the-art solutions.
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Kirn, Borut. "Exploring the optimal duration of video recording in a post-discharge eLearning platform for cardiac patients." F1000Research 8 (May 21, 2019): 705. http://dx.doi.org/10.12688/f1000research.19087.1.
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Background: On a post-discharge eLearning platform for patients with coronary artery disease, videos are used as the main educational media. Medical content takes a long time to be thoroughly explained, frequently exceeding the viewer’s attention span. To find the optimal duration for such an educational video, we studied the retention of video watching. Methods: In this study, 135 (88% male; age 62±9 years) patients with coronary artery disease actively used eLearning platform which included 60 video recordings with duration ranging from 21 sec to 303 sec. The videos were divided into two groups based on their duration (short < 100 sec and long > 100 sec). From the platform usage metadata, an average video retention rate was obtained as a ratio of video viewing time and total video duration for videos watched six times or more. Independent t-tests for mean values and f-test for variance were used to compare the groups. Results: In total, 35 (18 short and 17 long) videos were included in the study and were viewed (mean ± SD) 22 ± 11 times. The mean duration of short videos was: 80 sec ± 14 sec and of long videos it was: 160 sec ± 51 sec. The retention rate in the short and long group was 0.99 ± 0.05 and 0.94 ± 0.19 respectively. Average values were not significantly different (P = 0.33), but variances were (P < 0.05). Conclusions: This study shows that the effective attention span for a video recording of this kind, based on an eLearning set-up and local population, is up to 100 sec. Videos shorter than 100sec are mostly watched fully without a break. In contrast, longer videos are often rewound, and parts watched again or not watched to the full length at all.
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Dewi Jumaheni, I. Gusti Ayu Irma, Ni Wayan Rati, and I. Komang Sudarma. "Understanding Plant Reproductive System through Animated Videos with Project-Based Learning Activities." Jurnal Ilmiah Sekolah Dasar 5, no. 2 (July 1, 2021): 202. http://dx.doi.org/10.23887/jisd.v5i2.36040.
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This research was conducted based on the lack of learning media that can be used through online and offline learning in the Covid-19 pandemic situation, limiting face-to-face learning. The main purpose of this study was to determine the development process and the validity of project-based learning-oriented animation videos on the theme of saving living things, especially on the topic of plant reproduction. The development of this animated video media used the ADDIE development model. The research subjects for developing project-based learning-oriented animation videos were two content experts, two learning design experts, two learning media experts, individual trials, and small group trials. The method of data collection was in the form of a questionnaire. The results of data analysis showed that the average score of material experts was 4.79 with very good qualifications, design experts 4.65 with very good qualifications, media experts at 4.62 with very good qualifications, individual tests of 4.8 with very good qualifications, and a small group test of 4.74 with very good qualifications. Thus, the overall validity of Project-Based Learning-oriented animation video media was in the range of 4.01 < X 5.01 with "very good" qualifications. So, Project-Based Learning-oriented animated video media on the theme of Save Living Creatures was feasible to use in learning.
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Balshine-Earn, Sigal, and Arnon Lotem. "Individual Recognition in a Cooperatively Breeding Cichlid: Evidence from Video Playback Experiments." Behaviour 135, no. 3 (1998): 369–86. http://dx.doi.org/10.1163/156853998793066221.
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AbstractMost theories of social behaviour and cooperation assume that animals can recognise other individuals, but this is rarefy tested. Using Neolamprologus brichardi, a cooperatively breeding cichlid fish, we monitored behavioural responses to (1) real fish versus video images of fish; (2) mate versus neighbour and (3) video images of mate versus video image of neighbour. All tests were controlled for size and sex. Fish reacted appropriately to the playbacks, although responses to videos were not as strong as to real fish. Both males and females fought against the images of stranger and neighbour fish and they courted images of mates. These results confirm that the cooperatively breeding fish, Neolamprologus brichardi, recognises individuals based on vision and that video playbacks contain sufficient information to facilitate recognition.
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Alomar, Abdulaziz Z. "Undergraduate Medical Students’ Perceptions of an Online Audio-Visual-Based Module for Teaching Musculoskeletal Physical Examination Skills." Journal of Medical Education and Curricular Development 9 (January 2022): 238212052210787. http://dx.doi.org/10.1177/23821205221078794.
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Introduction Video-based learning has gained prominence in medical education and, more recently, in musculoskeletal teaching. This study investigated medical students’ perceptions of the effectiveness of online video-based learning for musculoskeletal physical examination skills. Methods For one academic year, undergraduate medical students were instructed online through video-based learning before bedside teaching about the physical examination of knee and shoulder joints. At the end of the course, the students participated in a survey to assess their perceptions of the online video-based learning module using a pre-validated questionnaire. The questionnaire consisted of closed-ended and open-ended questions. The closed-ended question responses were assessed using a Likert scale; the open-ended responses were analyzed qualitatively. Results In total, 242 out of 310 students who participated in the online video-based learning responded to the survey. Most students found the teaching approach to be satisfactory and preferable to traditional teaching methods. However, they also felt that these modules could not replace hands-on practice. The most helpful aspects of the training modules were a better understanding of the specific tests, technique, and sequence of administering the physical examination. Perceived limitations included the inadequately addressed theoretical basis of the physical examination and the special tests, the need for more time to explain clinical anatomy, and the practical implications of the positive special tests. Conclusion Undergraduate medical students perceive VBL as helpful for MPES learning. The positive aspects of the VBL approach in teaching MPES are that it is comprehensive, easily accessible, offers standardized teaching, save times, and it includes demonstrations of special tests, examination techniques, and the sequence and organization of the clinical examination. The main perceived limitations were lack of content regarding clinical reasoning and the anatomical basis of the clinical tests.
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Sadry, Sanaz, and Ece Buyukbasaran. "Content analysis and reliability of YouTube™ videos on clear aligner." APOS Trends in Orthodontics 11 (October 5, 2021): 209–17. http://dx.doi.org/10.25259/apos_46_2021.
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Objectives: The aim of the present study is to evaluate the accuracy and reliability of the information provided in the videos about the clear aligner on the Youtube video platform, an internet information source. Materials and Methods: A video search was performed on the Youtube video platform using three keywords determined with the Google Trends application. After the videos were ranked based on their view counts, a total of 75 videos were analyzed, 47 being the first for each term. After applying the exclusion criteria (repetitive content, no audio content or title information, irrelevant to the topic, only promotional content, duration over 15 min, and addressing other orthodontic treatments), the remaining 47 videos were evaluated. Regarding the videos, the following parameters were recorded: View count, number of likes, number of dislikes, number of comments, video duration, and days since the uploaded date. A scoring system consisting of seven parameters was used to classify the video content quality as low and high. The video information and quality index were utilized to evaluate the quality of the videos universally. Statistical analyses were performed with Stata/IC computer program using Shapiro–Wilks, Kruskall–Wallis, Mann–Whitney U, and linear regression (Backward method) tests. Statistical significance value was set at P < 0.05. Results: Evaluation of the videos based on their upload source revealed that 27 videos were downloaded from individuals, ten videos from doctors and ten videos from commercial sources, and the number of subscribers to these sources varied significantly (P < 0.05). Evaluation of the videos based on the information provided, revealed that 32 videos had poor quality, ten videos had moderate quality and five videos had good quality information content, and the video durations varied significantly (P < 0.05). It was seen that of the 75 videos viewed, only 10 (13.3%) provided information of moderate-good quality. The number of likes was found to be the parameter that significantly affects the view count (P < 0.05). Conclusion: YouTube videos prove insufficient as a source of information on orthodontic treatment with clear aligner. Health-care professionals should be aware of online platforms to ensure that patients can access accurate information.
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Sadry, Sanaz, and Ece Buyukbasaran. "Content analysis and reliability of YouTube™ videos on clear aligner." APOS Trends in Orthodontics 11 (October 5, 2021): 209–17. http://dx.doi.org/10.25259/apos_46_2021.
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Objectives: The aim of the present study is to evaluate the accuracy and reliability of the information provided in the videos about the clear aligner on the Youtube video platform, an internet information source. Materials and Methods: A video search was performed on the Youtube video platform using three keywords determined with the Google Trends application. After the videos were ranked based on their view counts, a total of 75 videos were analyzed, 47 being the first for each term. After applying the exclusion criteria (repetitive content, no audio content or title information, irrelevant to the topic, only promotional content, duration over 15 min, and addressing other orthodontic treatments), the remaining 47 videos were evaluated. Regarding the videos, the following parameters were recorded: View count, number of likes, number of dislikes, number of comments, video duration, and days since the uploaded date. A scoring system consisting of seven parameters was used to classify the video content quality as low and high. The video information and quality index were utilized to evaluate the quality of the videos universally. Statistical analyses were performed with Stata/IC computer program using Shapiro–Wilks, Kruskall–Wallis, Mann–Whitney U, and linear regression (Backward method) tests. Statistical significance value was set at P < 0.05. Results: Evaluation of the videos based on their upload source revealed that 27 videos were downloaded from individuals, ten videos from doctors and ten videos from commercial sources, and the number of subscribers to these sources varied significantly (P < 0.05). Evaluation of the videos based on the information provided, revealed that 32 videos had poor quality, ten videos had moderate quality and five videos had good quality information content, and the video durations varied significantly (P < 0.05). It was seen that of the 75 videos viewed, only 10 (13.3%) provided information of moderate-good quality. The number of likes was found to be the parameter that significantly affects the view count (P < 0.05). Conclusion: YouTube videos prove insufficient as a source of information on orthodontic treatment with clear aligner. Health-care professionals should be aware of online platforms to ensure that patients can access accurate information.
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Lee, Hyeonju, Donghyun Woo, and Sunjin Yu. "Virtual Reality Metaverse System Supplementing Remote Education Methods: Based on Aircraft Maintenance Simulation." Applied Sciences 12, no. 5 (March 4, 2022): 2667. http://dx.doi.org/10.3390/app12052667.
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Due to the COVID-19 pandemic, there has been a shift from in-person to remote education, with most students taking classes via video meetings. This change inhibits active class participation from students. In particular, video education has limitations in replacing practical classes, which require both theoretical and empirical knowledge. In this study, we propose a system that incorporates virtual reality and metaverse methods into the classroom to compensate for the shortcomings of the existing remote models of practical education. Based on the proposed system, we developed an aircraft maintenance simulation and conducted an experiment comparing our system to a video training method. To measure educational effectiveness, knowledge acquisition, and retention tests were conducted and presence was investigated via survey responses. The results of the experiment show that the group using the proposed system scored higher than the video training group on both knowledge tests. As the responses given to the presence questionnaire confirmed a sense of spatial presence felt by the participants, the usability of the proposed system was judged to be appropriate.
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Jiang, Xiantao, Tian Song, Daqi Zhu, Takafumi Katayama, and Lu Wang. "Quality-Oriented Perceptual HEVC Based on the Spatiotemporal Saliency Detection Model." Entropy 21, no. 2 (February 11, 2019): 165. http://dx.doi.org/10.3390/e21020165.
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Perceptual video coding (PVC) can provide a lower bitrate with the same visual quality compared with traditional H.265/high efficiency video coding (HEVC). In this work, a novel H.265/HEVC-compliant PVC framework is proposed based on the video saliency model. Firstly, both an effective and efficient spatiotemporal saliency model is used to generate a video saliency map. Secondly, a perceptual coding scheme is developed based on the saliency map. A saliency-based quantization control algorithm is proposed to reduce the bitrate. Finally, the simulation results demonstrate that the proposed perceptual coding scheme shows its superiority in objective and subjective tests, achieving up to a 9.46% bitrate reduction with negligible subjective and objective quality loss. The advantage of the proposed method is the high quality adapted for a high-definition video application.
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Putri, Evi Jovita, Gilang Ilham Agustinus, and Intan Kusuma Wardhani. "USAGE OF YOU TUBE- BASED VIDEOS IN LEARNING DAILY ENGLISH CONVERSATION FOR CHILDREN AT ASRAMA YATIM MIZAN AMANAH, SALIHARA, PASAR MINGGU, SOUTH JAKARTA." Pujangga 6, no. 1 (July 1, 2020): 48. http://dx.doi.org/10.47313/pujangga.v6i1.852.
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ABSTRACT This research aims to analyze the effectiveness of YouTube-based videos as a media in learning daily English conversation for children and to identify factors affecting learning daily English conversation for children by using YouTube-based videos as a media. To obtain the aims, this research uses six children whose ages vary from ten to twelve years old lived in Asrama Yatim Mizan Amanah located at Jalan Salihara, Pasar Minggu, South Jakarta as the source of data. Descriptive qualitative method is applied as the research design. In collecting data, the researchers gather the result of learning activities in pre-tests, treatments, and post-tests. Meanwhile, in analyzing the data, the researchers compare the children’s pre-test score with their post-test score to see the development of learning which show their competence before and after being treated. in this case, the research is focused on two topics, Greeting and Introduction in English. The children are introduced some expressions of greeting and introduction in English children by using YouTube-based videos, then some roleplays or conversation containing expressions of greeting and introduction are shown to the children by watching together YouTube-based videos. The last, the children are asked to recognize and practice the expression of greeting and introduction in English. The result shows that the usage of YouTube based video as a media in learning daily English conversation for children is considered effective. Four out of six children are able to memorize new expressions of both greeting and introduction in English, whereas the two other children remains stagnant after learning using YouTube based videos. It is found that there are factors that affect learning English for children by using this media, they are; personality, motivation and attitude, intelligent, learners’ belief, and personality. The most influential factors affecting learning are motivation and attitude. The successful children have these factors stronger rather than the stagnant children. Based on the result, the effectiveness in learning English using YouTube-based videos will be stronger if it is supported by an interactive and conducive learning atmosphere. The learning atmosphere should be considered to achieve a stronger speaking English proficiency. Key words: YouTube based-videos, language learning, daily English conversation ABSTRAK Penelitian ini ditujukan untuk menganalisis keefektifan penggunaan video berbasis YouTube sebagai media dalam belajar percakapan bahasa Inggris sehari-hari pada anak-anak dan untuk mengidentifikasi faktor yang mempengaruhi pembelajaran percakapan bahasa Inggris sehari-hari pada anak-anak yang menggunakan video berbasis YouTube. Untuk mencapai tujuan tersebut, penelitian ini menjadikan enam orang anak berumur sepuluh hingga dua belas tahun yang tinggal di Asrama Yatim Mizan Amanah Jalan Salihara, Pasar Minggu, Jakarta Selatan sebagai sumber data. Penelitian ini menggunakan metode descriptive qualitative. Disini, proses pengumpulan data meliputi pengumpulan hasil pre-tests, treatment, dan post-test. Sementara itu, proses analisis data dilakukan dengan cara membandingkan skor pre-test dengan skor post-test pembelajar untuk melihat perkembangan pembelajaran yang menunjukkan perkembangan anak-anak sebelum dan sesudah pembelajaran. Penelitian difokuskan pada dua topik pembelajaran yaitu sapaan dan perkenalan bahasa Inggris. Dalam hal ini anak-anak diajak mengenal ekspresi sapaan dan perkenalan dalam Bahasa Inggris melalui video yang ada pada YouTube. Kemudian menonton beberapa simulasi dari perilaku menyapa dan berkenalan dalam Bahasa Inggris juga melalui video You-Tube. Pada tahap terakhir, para pembelajar ini diminta untuk berlatih mengingat dan mempraktekkan ungkapan sapaan dan perkenalan dalam Bahasa Inggris Hasil penelitian menunjukkan bahwa penggunaan video berbasis YouTube sebagai media belajar percakapan bahasa Inggris sehari-hari adalah efektif. Empat dari 6 anak mampu mengingat kosakata sapaan dan perkenalan yang baru secara signifikan setelah belajar menggunakan media video berbasis You Tube, meskipun ada 2 anak yang tidak mengalami peningkatan. Ada beberapa faktor yang memengaruhi pembelajaran pada anak-anak tersebut diantaranya kepribadian, motivasi dan sikap, kecerdasan, dan keyakinan. Faktor yang paling berpengaruh pada pembelajaran adalah motivasi dan sikap. Anak-anak yang mengalami peningkatan belajar yang pesat memiliki faktor motivasi dan sikap yang lebih kuat dibanding anak-anak yang tidak mengalami peningkatan. Berdasarkan hasil tersebut, keefektifan dalam belajar percakapan Bahasa Inggris sehari-hari menggunakan video YouTube menjadi lebih besar jika didukung oleh atmosfer belajar yang interaktif dan kondusif. Hal ini mesti diperhatikan guna mencapai kemampuan Bahasa Inggris lisan yang lebih baik. Kata Kunci: Video YouTube, Pembelajaran Bahasa, Percakapan dasar dalam Bahasa Inggris.
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Ockey, Gary J. "Construct implications of including still image or video in computer-based listening tests." Language Testing 24, no. 4 (October 2007): 517–37. http://dx.doi.org/10.1177/0265532207080771.
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Lin, Lu-Fang. "The Impact of Video-based Materials on Chinese-Speaking Learners’ English Text Comprehension." English Language Teaching 9, no. 10 (August 16, 2016): 1. http://dx.doi.org/10.5539/elt.v9n10p1.
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<p>This study investigated whether video-based materials can facilitate second language learners’ text comprehension at the levels of macrostructure and microstructure. Three classes inclusive of 98 Chinese-speaking university students joined this study. The three classes were randomly assigned to three treatment groups: on-screen text (T Group), concurrent narration with on-screen text (NT Group), and video with concurrent narration and on-screen text (VNT Group). The data were collected through the macrostructure and microstructure reading comprehension pre- and post-tests and the immediate test. The statistic results of the immediate test and the post-tests showed that the VNT group performed significantly better on the macrostructure comprehension than the T and NT groups. Armed with the perspectives of multiliteracies and the significant results, the study makes instructional recommendations to integrate video in second-language reading comprehension instruction.</p>
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Zhong, Lujie, Shijie Jia, and Mu Wang. "A Novel Contribution-Aware Neighbor-Assist Video Delivery Solution over Mobile Content-Centric Networks." Mobile Information Systems 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/5352165.
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In this paper, we propose a novel contribution-aware neighbor-assist video delivery solution over mobile content-centric network (CNVD). CNVD allows the nodes to build and maintain neighbor relationship with other nodes to share cached video resources and achieve unicast-based video lookup. CNVD constructs an estimation model of contribution of neighbor nodes by investigation of lookup delay, number of cached videos, lookup success rate, and geographical distance. CNVD designs the estimation methods of interest level and lookup capacity of nodes for video content, which enables the nodes to decide whether to build neighbor relationship with other nodes. A maintenance method of neighbor relationship between nodes is proposed, which enables the nodes to update valid time of neighbor relationship in terms of contribution of neighbor nodes and decide whether to remove neighbor relationship in terms of the current valid time of neighbor relationship. Further, CNVD designs a contribution-based video lookup algorithm, which reduces lookup delay and improves lookup success rate. Extensive tests show how CNVD achieves much better performance results in comparison with other state-of-the-art solutions.
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Naifah, Naifah, Fikrotul Khusnia, and Rosidi Rosidi. "Taṭwīr Wasīlat Vīdiyū al-Rusūm al-Mutaḥarrikah li-Tarqiyat Injāz Taʿlīm al-Mufradāt ladá at-Ṭullāb fī al-Madrasah al-Ibtidā’īyah." LISANIA: Journal of Arabic Education and Literature 6, no. 2 (December 21, 2022): 213–34. http://dx.doi.org/10.18326/lisania.v6i2.213-234.
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This research aimed to develop animation videos to assimilate Arabic vocabulary learning in the Islamic Elementary School 56 Nahdlatul Ulama Krajankulon, Kaliwungu, Kendal using the ADDIE model of Research and Development (RD), consisting of: Need Analysis, Design, Development, Implementation, and Evaluation. The results were based on five stages: First, a needs analysis of Arabic language education based on student questionnaires showed that 63% of the 28 students who filled out the questionnaires met the need criteria. Second, designing products by preparing competency maps, material maps, and manuscripts. Third, the creation of animated video media and expert validation tests, where media experts achieved a 90% achievement level and material experts received an 85% realization level. Fourth, an application of the animation video product to 28 students of class 5A. As for the application of the video animation product, a pretest, a product trial, a dimensional test, and an attractiveness test were done. The video animation product got a score of 85% with very attractive criteria. Fifth, a video evaluation was conducted, and it was found to improve vocabulary learning performance.
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Andriani, Khantika, Subiki Subiki, and Bambang Supriadi. "PENGARUH MODEL PROBLEM BASED LEARNING (PBL) DISERTAI VIDEO BERBASIS KONTEKSTUAL TERHADAP HASIL BELAJAR DAN KETERAMPILAN PROSES SAINS DALAM PEMBELAJARAN FISIKA DI SMA." JURNAL PEMBELAJARAN FISIKA 10, no. 1 (March 31, 2021): 36. http://dx.doi.org/10.19184/jpf.v10i1.19687.
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This research aims: (1) to examine the influence of problem based learning models along with contextual-based videos on the learning outcomes of students in physics learning in sma (2) examining the influence of problem based learning models along with contextual-based videos on the science process skills of students in high school learning. The research model used is true experiment with posttest only control design research design. The research samples used are class X IPA 2 (experiment class) and X IPA 1 (control class) of Tamanan State High School. Data obtained include posttest results and science process skills scores. The data is analyzed with statistics consisting of homogeneity tests, normality tests, and independent sample t-test tests. From an independent sample t-test analysis obtained significantly (sig2-tailed) by 0,000 (0.000 ≤ 0.05), it can be concluded Ho was rejected and Ha accepted that there was a difference in the learning outcomes of the experiment class students better than the control class. This can be seen from the average posttest score of the experiment class of 72.48 while the average posttest value of the control class is 48.87. Based on the results of analysis of science process skills students through two experiments obtained scores in a row of 76.61 and 77.42 in the excellent category. Thus the problem based learning model accompanied by contextual-based video affects the learning outcomes and science process skills of students in high school.
Keywords: Problem Based Learning, Contextual Video, Physics Learning
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Liu, Gang, Guo Zheng Yan, Bing Quan Zhu, and Fei Xu. "Design and Experiment of Video Capsule Endoscopy Based on Sleep Mode." Applied Mechanics and Materials 347-350 (August 2013): 942–46. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.942.
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In view of the contradiction between real-time image acquisition and energy restriction in capsule endoscopy design at present, a video capsule endoscopy system based on sleep mode was designed in compromised method. Hardware and software parts inside the system were designed and studied to realize segmented real-time function of the video capsule endoscopy in the way of dormancy and power outages. So the work time of the video capsule endoscopy would be extended. A prototype was developed which total size was just Φ12mmx25mm, so that it was easy to be swallowed. In the vitro test, the video capsule endoscopy system could work over 9h in one second dormancy mode. The video capsule endoscopy prototype could interval real-time acquire the pig intestine internal image clearly in pig intestine experiment instead of human intestine. Tests and experiments show that these scheme and designs were feasible.
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YANG, FUZHENG, and SHUAI WAN. "SPATIAL-TEMPORAL VIDEO QUALITY ASSESSMENT BASED ON TWO-LEVEL TEMPORAL POOLING." International Journal of Image and Graphics 11, no. 02 (April 2011): 235–49. http://dx.doi.org/10.1142/s021946781100407x.
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In this paper, a video quality assessment method based on two-level temporal pooling is proposed. By dividing a video sequence into groups of frames (GOFs) with variable lengths, a short-term temporal pooling is performed first at the eye fixation level to obtain the GOF quality. The determination of the GOF size is based on empirical observations from subjective tests that evaluate the duration of successive frames based on which steady quality judgment can be made by the human visual system. The video quality is further obtained by a second level of long-term temporal pooling using the GOF quality. The impact of strong impairment in part of the video on the cognitive system is incorporated in the proposed method for video quality assessment. Extensive experimental results have demonstrated the effectiveness of the proposed method for spatial-temporal distortion evaluation considering both regular and irregular frame loss.
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Jansen, Tom, Martin Gathen, Amadeo Touet, Hans Goost, Dieter Christian Wirtz, Christof Burger, Robert Pflugmacher, Kristian Welle, and Koroush Kabir. "Spine Examination during COVID-19 Pandemic via Video Consultation." Zeitschrift für Orthopädie und Unfallchirurgie 159, no. 02 (February 2, 2021): 193–201. http://dx.doi.org/10.1055/a-1283-7160.
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Abstract Introduction During the current COVID-19 pandemic video consultations are increasingly common in order to minimize the risk of infection for staff and patients. The aim of this study was to evaluate the feasibility of a spine examination via video. Methods A total of 43 patients were recruited. Each participant underwent a video-based (VB) and a conventional face-to-face (FTF) spine examination. Pain intensity, active range of motion, inspection, a neurophysiologic basic exam and provocations tests were evaluated using video-based and face-to-face methods. Results The intra-rater reliability (IRR) was measured between both examinations. Good to very good IRR values were obtained in inspection (Kappa between 0,752 und 0,944), active range of motion and basic neurophysiological examination (Kappa between 0,659 und 0,969). Only moderate matches were found in specific provocation tests (Kappa between 0,407 und 0,938). A video-based spine examination is a reliable tool for measuring pain intensity, active range of motion and a basic neurophysiologic exam. Conclusion A basic spine examination during a video consultation is possible. A good agreement of the test results between video-based and face-to-face examination could be found.
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Amaliah, Nur Utami, I. Wayan Darmadi, and Sahrul Saehana. "Analysis of Students’ Understanding of Motion Concept with Video based Learning Assisted by Tracker Software." Berkala Ilmiah Pendidikan Fisika 8, no. 2 (June 30, 2020): 126. http://dx.doi.org/10.20527/bipf.v8i2.8369.
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This study aims to determine and analyze students' understanding of the motion concept taught with video-based learning assisted by Tracker Software. The subjects of this descriptive qualitative research were 30 students from 10th grade at SMA Negeri 5 Palu. The instruments in this study were multiple-choice tests and interviewed guide. Multiple-choice tests are used with reasons and are equipped with a Specific Response Index (CRI). It was given before and after video-based learning assisted by Tracker Software applied. To add the information about students' understanding, the interview with a few respondents was done. Respondents were selected based on subjects' written test results in the high, medium, and low categories. They also were interviewed related to their conception and certainty of their answers. In learning by using video-assisted by tracker software, the student also employed the worksheet in experimenting. The results showed that a conceptual understanding of student motion on the initial test could be categorized as low. After using video media that is assisted by Tracker Software, students' conceptual understanding increases. Thus, the teacher can use video media and software to teach physics concepts that can be directly observed and displayed using mathematical and graphical representations.
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Blomqvist, Minna T., Pekka Luhtanen, Lauri Laakso, and Esko Keskinen. "Validation of a Video-Based Game-Understanding Test Procedure in Badminton." Journal of Teaching in Physical Education 19, no. 3 (April 2000): 325–37. http://dx.doi.org/10.1123/jtpe.19.3.325.
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The purpose of this study is to report on the development and validation of a game-understanding test procedure in badminton. A basic video-based test was constructed, and primary school children (ages 9–10 and 11–12 years, N = 120) served as participants. An advanced test was designed to detect differences between national level junior badminton players (11–14 years, n = 19) and primary and secondary school children (11–14 years, n = 45). The video-based tests consisted of 15 to 19 different sequences that were simulations of actual offensive and defensive game situations. In every sequence, players were to solve tactical problems by selecting appropriate solutions and arguments for their decisions. Validity and reliability of the tests were examined through these groups, and the findings suggest that the test procedure developed provides a valid and reliable method for assessing game understanding in badminton.
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Hou, Jong-Uk. "MPEG and DA-AD Resilient DCT-Based Video Watermarking Using Adaptive Frame Selection." Electronics 10, no. 20 (October 11, 2021): 2467. http://dx.doi.org/10.3390/electronics10202467.
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We present a robust video watermarking scheme and report the detailed robustness of the video watermarking assessed based on standard criteria obtained from Information Hiding and its Criteria (IHC) Committee. Using discrete cosine transform domain spread-spectrum watermarking, our system achieves robustness under various non-hostile video processing techniques, including MPEG compression and digital/analog–analog/digital (DA-AD) conversion. The proposed system ensures that a 16-bit embedded sequence can be extracted through adaptive frame selection in any 15-s interval, even with a long video clip. To evaluate the performance of the proposed watermarking scheme, we conducted robustness tests under a DA-AD conversion environment, based on the MPEG-4 part 10 (H.264) codec. The experiment results obtained indicate that, in addition to being robust against non-hostile video processes, the proposed method achieves invisibility. The assessment of the developed watermarking scheme also satisfies the third edition of the IHC video watermarking evaluation criteria.
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Gaurav Melkani and Dr. Sunil Maggu. "Image-Based Face Detection and Recognition." International Journal for Modern Trends in Science and Technology 6, no. 12 (January 1, 2021): 466–70. http://dx.doi.org/10.46501/ijmtst061290.
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Face recognition from image or video is a popular topic in biometrics research. Many public places usually have surveillance cameras for video capture and these cameras have their significant value for security purpose. It is widely acknowledgedthatthefacerecognitionhaveplayedanimportant role in surveillance system as it doesn’t need the object’s cooperation. The actual advantages of face based identification over other biometrics are uniqueness and acceptance. As human face is a dynamic object having high degree of variability in its appearance, that makes face detection a difficult problem in computer vision. In this field, accuracy and speed of identification is a mainissue. The goal of this paper is to evaluate various face detection and recognition methods, provide complete solution for image based face detection and recognition with higher accuracy, better response rate as an initial step for video surveillance. Solution is proposed based on performed tests on various face rich databases in terms of subjects, pose, emotions, race andlight.
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Wei, Bi Gui, Qing Chang, Cai Yun Yan, and Guo Zhen Zhang. "Recognition System for Digital Meter Dynamic Display from Video Based on MATLAB." Advanced Materials Research 347-353 (October 2011): 2183–86. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.2183.
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According to the feature of numeral image of electronic balance photographed by CCD, MATLAB, especially its video image toolbox, was used to achieve the manual character region location, automatical character segmentation and automatical digit recognition of the digit image in video signals. The method is able to recognize the values in the video signals with more than 97% correctness in multiple sampling tests. However, there were also some abnormal data caused by LED light retention in the dynamic display process and recorded by high frame rate video. The problem was solved by replacing the points outside the range with neighborhood median. This method is simple, highly adaptable and reliable, thus facilitate the research on filter media surface wettability and provide a set of reference for solution this kind of research.
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Manuaba, Gede Ngurah Griantara, and DB KT NGR Semara Putra. "Learning Video Based on Contextual Approach Science Content of Grade V Elementary School." Indonesian Journal Of Educational Research and Review 4, no. 2 (October 31, 2021): 178. http://dx.doi.org/10.23887/ijerr.v4i2.39432.
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The lack of use of video media in the learning process causes students to have difficulties in learning. This research aims to develop audiovisual learning media tailored to the needs of today's learning. The test subjects in this study consisted of several experts and students. The experts consist of learning content experts, learning design experts and learning media experts and involve grade V students to conduct individual trials and small group trials. This development research uses ADDIE development model (analyze, design, development, implementation, evaluation) as systematic steps in the product development process. The data collection method in this study consists of observations, questionnaires and interviews. The data analysis techniques used are quantitative and qualitative descriptive data analysis techniques. Based on the results of product trials, the instructional video was declared feasible by the test subjects, namely learning content experts, learning design experts, learning media experts and students. The results of the evaluation of the learning content expert obtained a percentage (95.83%) with very good qualification, the results of the learning design expert's assessment obtained a percentage (94.23%) with very good qualification, the results of the learning media expert's assessment obtained a percentage (85.00%) with good qualifications and the results of student assessments through individual tests obtained a percentage (94.00%) with very good qualification, and the results of student assessments through small group tests obtained a percentage (95.83%). Based on the results of the product trial, it is concluded that the developed learning videos in very good qualifications and suitable for use in the learning process.
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Wu, Dong Mei, and Xin Zhou. "Extracting Foreground Based on Codebook for Early Forest Smoke Video." Advanced Materials Research 1044-1045 (October 2014): 1149–52. http://dx.doi.org/10.4028/www.scientific.net/amr.1044-1045.1149.
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Shaking leaves has been the biggest interference for early forest smoke video detection. Moving average method, Gaussian mixture method and its improved methods are often used to update background, but the performance is not good through background subtraction. Codebook algorithm is applied to extract foreground for early forest smoke detection, quantization techniques are used to obtain background model from time series, then getting foreground image through background subtraction. Through multiple video tests, the experimental results that the filtering performance, anti-noise performance and accuracy are better than other methods above.
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Anam, Amirul, Widya Wati, and Nur Asiah. "Pengembangan Video Pembelajaran Fisika Channel Youtube Berbantu Aplikasi Powtoon pada Materi Suhu dan Kalor." U-Teach: Journal Education of Young Physics Teacher 1, no. 1 (July 5, 2020): 19–28. http://dx.doi.org/10.30599/uteach.v1i1.19.
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This research aims to produce physics learning videos on the YouTube channel assisted by Powtoon application on temperature and heat subject that meets valid criteria. To make learning interesting, learning videos need to be developed, one of the interesting learning videos is the Physics Learning Video on the YouTube Channel assisted by the Powtoon application. The research method used in this research is Research and Development with the Borg and Gall model. Based on the results of the research, the validity score of the Learning Video assisted by the Powtoon application based on expert judgment is in very valid criteria, with the percentage of validation from media experts is 84%, from material experts 92%, and IT experts 89%. Teachers and students responded positively to the attractiveness of Learning Videos assisted by the Powtoon application as a learning media, with the percentage of teacher response scores reaching 85%, small group tests 79%, and field test results 82%. Development of Learning Videos assisted by the Powtoon application is very valid and gets positive responses to be used as learning media.
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Zheng, Jingjing, Shuhua Teng, Peirong Li, Wei Ou, Donghao Zhou, and Jun Ye. "A Novel Video Copyright Protection Scheme Based on Blockchain and Double Watermarking." Security and Communication Networks 2021 (December 13, 2021): 1–16. http://dx.doi.org/10.1155/2021/6493306.
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With the continuous development of multimedia, more and more digital works such as videos are spread, stored, and used in the network. In recent years, digital copyright infringement disputes have occurred frequently. The traditional copyright protection system has some problems, such as difficulty confirming copyright, monitoring infringement, and obtaining evidence for rights protection. To this end, we have designed and implemented a novel video copyright protection scheme based on the blockchain and double watermarking technology. We use the image correlation coefficient method to extract video keyframes. And we combine with Contourlet Transform domain, QR decomposition, and SIFT algorithm to improve the robustness of watermark against geometric attacks on the premise of invisibility. After that, we use Arnold Transformation (Cat Map) based on the Maximum Entropy Threshold Segmentation to encrypt the robust watermark and strengthen the security. Moreover, based on the characteristics of the fragile watermarking, we accurately locate the attacked video’s tamper position and complete the integrity authentication of the watermarked video. In addition, the hash digest of the video watermark and the user ID of the copyright owner is signed by SM2 and uploaded to the blockchain. The user can register the copyright after passing the identity authentication. We conduct tests and security analysis on the blockchain performance of the system, the performance of the commercial cryptography algorithm, and the security of the watermarking system. The experimental results show that the blockchain used in this system conforms to the industry standard, the performance of SM2 and SM3 is better than ECC-256 and SHA-256, and the system security is well guaranteed.
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Singla, Ashutosh, Stephan Fremerey, Frank Hofmeyer, Werner Robitza, and Alexander Raake. "Quality Assessment Protocols for Omnidirectional Video Quality Evaluation." Electronic Imaging 2020, no. 11 (January 26, 2020): 69–1. http://dx.doi.org/10.2352/issn.2470-1173.2020.11.hvei-069.
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In recent years, with the introduction of powerful HMDs such as Oculus Rift, HTC Vive Pro, the QoE that can be achieved with VR/360° videos has increased substantially. Unfortunately, no standardized guidelines, methodologies and protocols exist for conducting and evaluating the quality of 360° videos in tests with human test subjects. In this paper, we present a set of test protocols for the evaluation of quality of 360° videos using HMDs. To this aim, we review the state-of-the-art with respect to the assessment of 360° videos summarizes their results. Also, we summarize the methodological approaches and results taken for different subjective experiments at our lab under different contextual conditions. In the first two experiments 1a and 1b, the performance of two different subjective test methods, Double-Stimulus Impairment Scale (DSIS) and Modified Absolute Category Rating (M-ACR) was compared under different contextual conditions. In experiment 2, the performance of three different subjective test methods, DSIS, M-ACR and Absolute Category Rating (ACR) was compared this time without varying the contextual conditions. Building on the reliability and general applicability of the procedure across different tests, a methodological framework for 360° video quality assessment is presented in this paper. Besides video or media quality judgments, the procedure comprises the assessment of presence and simulator sickness, for which different methods were compared. Further, the accompanying head-rotation data can be used to analyze both content- and quality-related behavioural viewing aspects. Based on the results, the implications of different contextual settings are discussed.
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Lievens, Filip, and Paul R. Sackett. "Video-based versus written situational judgment tests: A comparison in terms of predictive validity." Journal of Applied Psychology 91, no. 5 (September 2006): 1181–88. http://dx.doi.org/10.1037/0021-9010.91.5.1181.
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Jia, Shijie, Ruiling Zhang, Shengli Jiang, and Mingchuan Zhang. "A Novel Video Sharing Solution Based on Demand-Aware Resource Caching Optimization in Wireless Mobile Networks." Mobile Information Systems 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/3725898.
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The video services in wireless mobile networks attract massive mobile video users, which triggers the demand for huge network traffic. In order to reduce network load and ensure user quality of experience (QoE), the MP2P-based video systems need to implement high-efficiency management and scheduling of video resources to optimize distribution and promote sharing with offloading traffic in underlaying networks. The traditional solutions do not efficiently address the problems caused by demand variation and node mobility for distribution optimization and resource sharing, so that promotion of video sharing performance in wireless mobile networks for user QoE and reduction of network load still is a significant challenge. This paper proposes a novel video sharing solution based on Demand-aware Resource Caching Optimization in wireless mobile networks (VDRCO). VDRCO models the process of video dissemination in overlay networks in terms of the epidemic model and discusses the main influence factors for video dissemination. By estimation for user demand and video distribution variation, VDRCO makes use of clustering nodes with similar video demand and movement behaviors to achieve distribution optimization and efficient video sharing. Extensive tests show how VDRCO achieves much better performance results in comparison with a state-of-the-art solution.
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Anwar, Zakiyah, Muhammad Syahrul Kahar, Rais Dera Pua Rawi, NurJannah Nurjannah, Hermanto Suaib, and Febrianti Rosalina. "Development of Interactive Video Based Powerpoint Media In Mathematics Learning." Journal of Educational Science and Technology (EST) 6, no. 2 (June 10, 2020): 167. http://dx.doi.org/10.26858/est.v6i2.13179.
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This study aims to determine the effectiveness and practicality of interactive video-based PowerPoint media implemented in learning. This research and development phase refers to the Research and Development (R&D) method. The assessment instruments consist of: (1) Validity instruments in the form of validity assessment instruments based on interactive video PowerPoint media; (2). Practicality instruments in the form of questionnaires for teacher and student responses to interactive video-based PowerPoint media; and (3) Effectiveness instruments in the form of observations of learning outcomes and student learning outcomes. Based on data analysis, obtained an average level of media validity of 3.99 and included in the valid criteria. Also, the practicality test results are seen from the teacher's response to learning by 4.4 and the response of students by 3.46 with practical criteria. This is supported by the results of students' learning tests on the use of interactive video-based PowerPoint media with an average score of students learning outcomes of 70.29. Therefore, it can be concluded that the interactive video-based PowerPoint media developed is effective and practical in the implementation of learning. On the other hand, the development of this media focuses on the concept of integrated learning video learning using PowerPoint and concentrates on interactive learning.
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Yu Narkevich, M., O. S. Logunova, P. I. Kalandarov, R. T. Gazieva, G. M. Aralov, G. V. Tokmazov, P. Yu Romanov, and S. Khushiev. "Results of experimental tests of building samples." IOP Conference Series: Earth and Environmental Science 939, no. 1 (December 1, 2021): 012031. http://dx.doi.org/10.1088/1755-1315/939/1/012031.
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Abstract The purpose of the experimental study presented in the work is to generate new knowledge about the quality of concrete samples in a new information field that consolidates information about the results of full-scale tests and video streams that were obtained during active laboratory experiments-studies. When conducting experimental studies, the traditional technology of testing concrete samples for central compression was used. This was accompanied by continuous monitoring and the formation of a video stream for each sample. A distinctive feature of the study is the formation of an information field of experiments, which contains three levels: the level of initial data, the level of analysis of initial data and the level of generation of new knowledge. The level of analysis of the source data using the video stream allows you to obtain information at the end of the experiment that cannot be recorded in real time. For the samples under study, time intervals with different rates of defect development were obtained. The results obtained made it possible to identify new possibilities for the formation of the information field during traditional experimental studies of the quality of concrete images and, based on the information obtained, to identify patterns of development of surface continuity disorders in dynamics. New opportunities for the formation of the information field allow in real time to obtain and process information on the state of concrete and reinforced concrete structures of construction projects by quality indicators and, on the basis of the data obtained, predicting the risk of accidents, including at hazardous production facilities.
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Anggraeni, Sri, Allya Restu Pribadi, Muhammad Ghiyats Al-Kadzim, Nathania Juniar Harefa, Raisya Hizkiya Syabina, Gabriela Chelvina Santiuly Girsang, and Asep Bayu Dani Nandiyanto. "Video-Based Teaching on Electrolysis Using Simple Copper Media to Vocational School Students." Journal of Engineering Education Transformations 35, S1 (January 1, 2022): 124–30. http://dx.doi.org/10.16920/jeet/2022/v35is2/22122.
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Abstract: The purpose of this study was to present learning the concept of electrolysis using simple copper media to vocational high school students in grade 3. This research was conducted by making a sample of well water with CuCl₂ solution which has a concentration of 1g / L and voltage variation (1.5; 3; 4.5; 6,0; 7.5; and 9,0 V). The test was carried out by electrolysis and water quality tests consisting of solute level testing, water pH test, and water temperature test. This research was also conducted by providing pre-test questions, learning videos, and post-tests. The results showed that the most effective electrolysis method occurred in variations with a voltage of 9V. This is indicated by the value of the decrease in concentration and the increase in mass of solutes after electrolysis. Meanwhile, the test results of vocational high school students show that video-based teaching can improve students 'understanding, as indicated by the students' post-test scores that are higher than the pretest scores. This research is expected to assist in the selection of instructional media for students and to find out which electrolysis method is effective for reducing Cu levels. Keywords: CuCl₂, electrolysis, learning media, simple copper.
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Lane, D., S. Hill, J. Huntingford, P. Lafuente, R. Wall, and K. Jones. "Effectiveness of slow motion video compared to real time video in improving the accuracy and consistency of subjective gait analysis in dogs." Open Veterinary Journal 5, no. 2 (2015): 158. http://dx.doi.org/10.5455/ovj.2015.v5.i2.p158.
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Objective measures of canine gait quality via force plates, pressure mats or kinematic analysis are considered superior to subjective gait assessment (SGA). Despite research demonstrating that SGA does not accurately detect subtle lameness, it remains the most commonly performed diagnostic test for detecting lameness in dogs. This is largely because the financial, temporal and spatial requirements for existing objective gait analysis equipment makes this technology impractical for use in general practice. The utility of slow motion video as a potential tool to augment SGA is currently untested. To evaluate a more accessible way to overcome the limitations of SGA, a slow motion video study was undertaken. Three experienced veterinarians reviewed video footage of 30 dogs, 15 with a diagnosis of primary limb lameness based on history and physical examination, and 15 with no indication of limb lameness based on history and physical examination. Four different videos were made for each dog, demonstrating each dog walking and trotting in real time, and then again walking and trotting in 50% slow motion. For each video, the veterinary raters assessed both the degree of lameness, and which limb(s) they felt represented the source of the lameness. Spearmans rho, Cramers V, and t-tests were performed to determine if slow motion video increased either the accuracy or consistency of raters SGA relative to real time video. Raters demonstrated no significant increase in consistency or accuracy in their SGA of slow motion video relative to real time video. Based on these findings, slow motion video does not increase the consistency or accuracy of SGA values. Further research is required to determine if slow motion video will benefit SGA in other ways.
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Gupta, Amar, Michael Nissan, Hani Rayess, Giancarlo F. Zuliani, and Michael Carron. "YouTube and Rhinoplasty: An Analysis of the Videos Available Online." American Journal of Cosmetic Surgery 34, no. 4 (April 19, 2017): 179–82. http://dx.doi.org/10.1177/0748806817704761.
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The objective of this study was to examine YouTube videos related to rhinoplasty created by both physicians and nonphysicians in order to determine the content of the videos, the selected topics of discussion, and other important parameters. A cross-sectional analysis was performed. YouTube videos that resulted when the search term “rhinoplasty” was entered were identified during the first 15 days of October 2014. The search was carried out daily during this time, and the first 20 unchanged videos were included in this analysis. Authorship, length of video, objective, total views, and type of video were recorded. Ten videos (50%) were physician based, 8 were patient based (40%), and 2 (10%) were television programs. Ten videos (50%) were longer than 10 minutes and 8 (40%) had greater than 100 000 views. The majority of videos (85%) aimed to provide didactic information on the rhinoplasty operation or intended to provide a perspective on the operation from an actual patient. Mann-Whitney U tests and Kruskal-Wallis tests were used to compare physician-based Web sites against those with other authorship with threshold of significance < .05 with no significant difference found between the groups. Videos submitted by practicing physicians were inherently different than those submitted by patients. While videos submitted by physicians concentrated primarily on the actual operation, videos submitted by patients were focused mainly on what they experienced during their procedure. The lack of safeguards on the quality or accuracy of videos posted on the popular Web site YouTube may lead to a possibility for misinformation to the consumer. It would likely be prudent for specialty bodies and organizations to submit high-quality videos to provide the best and most up-to-date information possible.