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With the rapid development of mobile Internet technology, mobile network data traffic presents an explosive growth trend. Especially, the proportion of mobile video business has become a large proportion in mobile Internet business. Mobile video business is considered as a typical business in the 5G network, such as in online education. The growth of video traffic poses a great challenge to mobile network. In order to provide users with better quality of experience (QoE), it requires mobile network to provide higher data transmission rate and lower network delay. This paper adopts a combined optimization to minimize total cost and maximize QoE simultaneously. The optimization problem is solved by ant colony algorithm. The effectiveness is verified on experiment.


2021 ◽  
Author(s):  
◽  
James McVay

<p>Robots to assist in USAR (urban search and rescue) situations have been employed since 2001. Such robots are designed to provide video and sensor feedback to evaluate hazardous environments before human taskforces are sent in. This minimises the risks human personnel are exposed to, while increasing the effectiveness of USAR operations. However, the typically high cost of such robots and the reliance on trained operators puts them out of reach of most USAR teams. In New Zealand, there are no nationally available robots suitable for USAR purposes. This thesis explores the development of new affordable devices that can be deployed for USAR operations, known as LittleBots. Three LittleBot variants are developed. Differing primarily in their locomotive capability, two mobile variants provide tether-less video reconnaissance and selectable gas level readings. The third, stationary variant, may be reconfigured with up to four selectable sensors, and is targeted at providing ongoing environmental monitoring at a disaster site. With all variants costing less than USD $155 in components, LittleBots are sufficiently low cost to be considered disposable, greatly increasing the likelihood they will be employed en masse. The stationary Sentry variant demonstrates a minimum runtime of over 60 hours, while the mobile variants provision up to 6 hours of mobile video reconnaissance. For independent deployment of LittleBots, a compatible Controller device is developed. Through user testing, the Controller device demonstrates easy and intuitive use, with no training required.</p>


2021 ◽  
Author(s):  
◽  
James McVay

<p>Robots to assist in USAR (urban search and rescue) situations have been employed since 2001. Such robots are designed to provide video and sensor feedback to evaluate hazardous environments before human taskforces are sent in. This minimises the risks human personnel are exposed to, while increasing the effectiveness of USAR operations. However, the typically high cost of such robots and the reliance on trained operators puts them out of reach of most USAR teams. In New Zealand, there are no nationally available robots suitable for USAR purposes. This thesis explores the development of new affordable devices that can be deployed for USAR operations, known as LittleBots. Three LittleBot variants are developed. Differing primarily in their locomotive capability, two mobile variants provide tether-less video reconnaissance and selectable gas level readings. The third, stationary variant, may be reconfigured with up to four selectable sensors, and is targeted at providing ongoing environmental monitoring at a disaster site. With all variants costing less than USD $155 in components, LittleBots are sufficiently low cost to be considered disposable, greatly increasing the likelihood they will be employed en masse. The stationary Sentry variant demonstrates a minimum runtime of over 60 hours, while the mobile variants provision up to 6 hours of mobile video reconnaissance. For independent deployment of LittleBots, a compatible Controller device is developed. Through user testing, the Controller device demonstrates easy and intuitive use, with no training required.</p>


Author(s):  
A.V. Novikov ◽  
K.V. Panevnikov ◽  
I.V. Pisarev

The paper reviews the use of mobile video monitoring equipment in coal mines. The most common option is the use of stationary video cameras with real-time video streaming to the mine dispatcher's control monitor via cables. Despite all the benefits of the information obtained, this method has certain limitations due to the specific features of the mine atmosphere, i.e. high humidity and dust levels, as well as the impossibility to organize video monitoring over the entire length of the mine workings. Therefore, mobile video monitoring equipment, both portable and vehicle-based, is efficient supplement to the stationary video cameras. The portable devices include smart phones and the battery-powered head lights with an integrated video camera, which have recently become very popular. In both cases, an important consideration, in addition to the actual video capturing, is the issue of transmitting video data to the top level, i.e. to the mine dispatcher's control panel. The following options are possible: connection to the mine wireless network hotspots via radio channel, reading the information in the lamp rooms when leaving the mine and real-time broadcasting from the mine to the top level. The assumption is made that in order to implement the fastest (and the most efficient) way that works without delays between capturing and transmitting of video data to the daylight surface, such as the latter of the options above, a communications infrastructure based on wireless and cable networks needs to be deployed in the mine workings. The required infrastructure is present in a number of systems designed to locate miners inside the mine workings as part of a multifunctional security system, which enables continuous radio communication of individual devices with infrastructure nodes and, therefore, real-time video data transmission.


2021 ◽  
Author(s):  
Kazuaki Tanaka ◽  
Reo Mayuzumi ◽  
Tomomi Takahashi ◽  
Sho Takaki ◽  
Natsuki Oka
Keyword(s):  

PLoS Medicine ◽  
2021 ◽  
Vol 18 (9) ◽  
pp. e1003744
Author(s):  
Maya Adam ◽  
Jamie Johnston ◽  
Nophiwe Job ◽  
Mithilesh Dronavalli ◽  
Ingrid Le Roux ◽  
...  

Background In South Africa, breastfeeding promotion is a national health priority. Regular perinatal home visits by community health workers (CHWs) have helped promote exclusive breastfeeding (EBF) in underresourced settings. Innovative, digital approaches including mobile video content have also shown promise, especially as access to mobile technology increases among CHWs. We measured the effects of an animated, mobile video series, the Philani MObile Video Intervention for Exclusive breastfeeding (MOVIE), delivered by a cadre of CHWs (“mentor mothers”). Methods and findings We conducted a stratified, cluster-randomized controlled trial from November 2018 to March 2020 in Khayelitsha, South Africa. The trial was conducted in collaboration with the Philani Maternal Child Health and Nutrition Trust, a nongovernmental community health organization. We quantified the effect of the MOVIE intervention on EBF at 1 and 5 months (primary outcomes), and on other infant feeding practices and maternal knowledge (secondary outcomes). We randomized 1,502 pregnant women in 84 clusters 1:1 to 2 study arms. Participants’ median age was 26 years, 36.9% had completed secondary school, and 18.3% were employed. Mentor mothers in the video intervention arm provided standard-of-care counseling plus the MOVIE intervention; mentor mothers in the control arm provided standard of care only. Within the causal impact evaluation, we nested a mixed-methods performance evaluation measuring mentor mothers’ time use and eliciting their subjective experiences through in-depth interviews. At both points of follow-up, we observed no statistically significant differences between the video intervention and the control arm with regard to EBF rates and other infant feeding practices [EBF in the last 24 hours at 1 month: RR 0.93 (95% CI 0.86 to 1.01, P = 0.091); EBF in the last 24 hours at 5 months: RR 0.90 (95% CI 0.77 to 1.04, P = 0.152)]. We observed a small, but significant improvement in maternal knowledge at the 1-month follow-up, but not at the 5-month follow-up. The interpretation of the results from this causal impact evaluation changes when we consider the results of the nested mixed-methods performance evaluation. The mean time spent per home visit was similar across study arms, but the intervention group spent approximately 40% of their visit time viewing videos. The absence of difference in effects on primary and secondary endpoints implies that, for the same time investment, the video intervention was as effective as face-to-face counseling with a mentor mother. The videos were also highly valued by mentor mothers and participants. Study limitations include a high loss to follow-up at 5 months after premature termination of the trial due to the COVID-19 pandemic and changes in mentor mother service demarcations. Conclusions This trial measured the effect of a video-based, mobile health (mHealth) intervention, delivered by CHWs during home visits in an underresourced setting. The videos replaced about two-fifths of CHWs’ direct engagement time with participants in the intervention arm. The similar outcomes in the 2 study arms thus suggest that the videos were as effective as face-to-face counselling, when CHWs used them to replace a portion of that counselling. Where CHWs are scarce, mHealth video interventions could be a feasible and practical solution, supporting the delivery and scaling of community health promotion services. Trial registration The study and its outcomes were registered at clinicaltrials.gov (#NCT03688217) on September 27, 2018.


Electronics ◽  
2021 ◽  
Vol 10 (18) ◽  
pp. 2217
Author(s):  
Yingwen Chen ◽  
Hujie Yu ◽  
Bowen Hu ◽  
Zhimin Duan ◽  
Guangtao Xue

Mobile users’ demands to delay-sensitive video streaming media put forward new requirements for mobile networks, such as architecture optimization. Edge caching as a new paradigm is proposed to enhance the quality of service (QoS) for mobile users at the network edge. Due to the limited coverage of edge cache nodes, the frequent handoffs between base stations would aggravate network traffic overhead, resulting in a bad experience of high latency and service interruption when mobile users browse videos. This paper first proposes a three-layer mobile edge network architecture and applied edge caching to video streams to build an efficient caching system. Given the user’s mobility and low latency of mobile video streaming, we propose an edge caching strategy based on user speed and content popularity. Horizontally, the user’s speed affects the spanning area and the buffer size of the cache on edge; vertically, content popularity determines the priority of cached videos. Experimental results demonstrate that our caching strategy outperforms other schemes in terms of the average delay and the cache hit ratio in mobile video streaming scenes compared with the other three classic caching methods.


2021 ◽  
Vol 11 (3) ◽  
pp. 518-527
Author(s):  
Jireh Phuah Rong Yao ◽  
Viswanath Sundar ◽  
Vinodhkumar Ramalingam

INTRODUCTION: Mobile video gaming among university students has increased rapidly, more than before the COVID-19 pandemic. This is very concerning as this could spark various problems, such as musculoskeletal pain and gaming disorders. OBJECTIVES:  The present study is to identify the predictors of mobile video gaming on musculoskeletal pain among university students in Selangor, Malaysia. PARTICIPANTS AND METHODS: This study was conducted online using a self-reported online questionnaire via Google Form and sent to university students in Selangor, Malaysia. Participants' gaming addiction was measured using the Ten Item Internet Gaming Disorder Test (IGDT-10) questionnaire, and the prevalence of musculoskeletal pain was assessed by the Modified Nordic Musculoskeletal Questionnaire (MNMQ). The data was analyzed using SPSS version 25. A descriptive and binomial linear regression test was used to predict the variables. The statistical significance was set at p < 0.05, and odds ratios were calculated with confidence intervals of 95%. RESULTS: The prevalence of Internet Gaming Disorder among university students in Selangor, Malaysia is 1.8% (n=3). The neck region (74.2%) was the most commonly reported body region with musculoskeletal pain, followed by the shoulder region (60.7 %), lower back region (55.8 %), and upper back region (50.9 %). The body position was the only predictor of mobile video gaming with musculoskeletal pain (p = 0.002) in the lower back region. CONCLUSION: According to the findings of this study, the prevalence of Internet Gaming Disorder (IGD) among university students was low and not addicted to gaming in the Covid-19 lockdown. We also found that participants who sat while playing mobile video games were more likely to develop low back pain. However, one of the limiting factors could be prolonged sitting in virtual classes during the lockdown, which causes low back pain.


2021 ◽  
Vol 1992 (2) ◽  
pp. 022114
Author(s):  
Yunhui Gao ◽  
Xiangfeng Suo ◽  
Yan Li

Author(s):  
Tran Thi Thien Trang ◽  
Nguyen Thi Phuong Hong

The purpose of this paper was to investigate whether mobile video recording task-based approach helps non-English majored students enhance their speaking skills. Forty students were selected and assigned to two groups: experimental group and control group. Mobile video recording was presented to experimental students while no training was given to students in the control group in the same task-based approach. The data was assessed to find out whether there were significant differences in terms of fluency, grammar, vocabulary and pronunciation. A questionnaire and a semi-structured interview were also implemented to explore students’ attitudes on the treatment. The study’s results revealed that students in the group treated with mobile video recording task-based approach significantly outperformed those in the control group. Furthermore, the results of the questionnaire and semi-structured interview revealed that the experimental students had positive attitudes towards using mobile video recording to practice speaking English. The study’s findings have led to several ideas and recommendations for the teachers, the students as well as the teaching and learning speaking in Vietnam.


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