In this manuscript, we describe the soft- and hardware architecture as well as the implementation of a modern Internet of Medical Things (IoMT) system for sensor-assisted telepsychotherapy. It ...enables telepsychotherapy sessions in which the patient exercises therapy-relevant behaviors in their home environment under the remote supervision of the therapist. Wearable sensor information (electrocardiogram (ECG), movement sensors, and eye tracking) is streamed in real time to the therapist to deliver objective information about specific behavior-triggering situations and the stress level of the patients. We describe the IT infrastructure of the system which uses open standards such as WebRTC and OpenID Connect (OIDC). We also describe the system's security concept, its container-based deployment, and demonstrate performance analyses. The system is used in the ongoing study SSTeP-KiZ (smart sensor technology in telepsychotherapy for children and adolescents with obsessive-compulsive disorder) and shows sufficient technical performance.
Assume-guarantee reasoning is indeed an effective compositional verification technique that can help mitigate the state explosion problem in model checking. However, the biggest challenge of applying ...assume-guarantee reasoning is how to best decompose a system. This paper presents a novel compositional verification frame based on geodesic distance. The proposed algorithm introduces novel techniques to decompose system components into groups. The algorithm's effectiveness and efficiency are evaluated through a comparative analysis with four state-of-the-art methods commonly used in the field. The results of the comparison consistently demonstrate that the proposed algorithm outperforms the state-of-the-art methods. This implies that the new algorithm exhibits superior performance in terms of decomposition quality and verification efficiency.
While physical exercise is known to help prevent falls in the elderly, bad weather and long distance between the home and place of exercise represent substantial deterrents for the elderly to join or ...continue attending exercise programs outside their residence. Conventional modalities for home exercise can be helpful but do not offer direct and prompt feedback to the participant, which minimizes the benefit.
We aimed to develop an elderly-friendly telepresence exercise platform and to evaluate the effects of a 12-week telepresence exercise program on fall-related risk factors in community-dwelling elderly women with a high risk of falling.
In total, 34 women aged 68-91 years with Fall Risk Assessment scores >14 and no medical contraindication to physical training-based therapy were recruited in person from a senior citizen center. The telepresence exercise platform included a 15-inch tablet computer, custom-made peer-to-peer video conferencing server system, and broadband Internet connectivity. The Web-based program included supervised resistance exercises performed using elastic resistance bands and balance exercise for 20-40 minutes a day, three times a week, for 12 weeks. During the telepresence exercise session, each participant in the intervention group was supervised remotely by a specialized instructor who provided feedback in real time. The women in the control group maintained their lifestyle without any intervention. Fall-related physical factors (body composition and physical function parameters) and psychological factors (Korean Falls Efficacy Scale score, Fear of Falling Questionnaire score) before and after the 12-week interventional period were examined in person by an exercise specialist blinded to the group allocation scheme.
Of the 30 women enrolled, 23 completed the study. Compared to women in the control group (n=13), those in the intervention group (n=10) showed significant improvements on the scores for the chair stand test (95% confidence interval -10.45 to -5.94, P<.001), Berg Balance Scale (95% confidence interval -2.31 to -0.28, P=.02), and Fear of Falling Questionnaire (95% confidence interval 0.69-3.5, P=.01).
The telepresence exercise program had positive effects on fall-related risk factors in community-dwelling elderly women with a high risk of falling. Elderly-friendly telepresence technology for home-based exercises can serve as an effective intervention to improve fall-related physical and psychological factors.
Clinical Research Information Service KCT0002710; https://cris.nih.go.kr/cris/en/search/ search_result_st01.jsp?seq=11246 (Archived by WebCite at http://www.webcitation.org/6zdSUEsmb).
Web Real-Time Communication (WebRTC) combines a set of standards and technologies to enable high-quality audio, video, and auxiliary data exchange in web browsers and mobile applications. It enables ...peer-to-peer multimedia sessions over IP networks without the need for additional plugins. The Opus codec, which is deployed as the default audio codec for speech and music streaming in WebRTC, supports a wide range of bitrates. This range of bitrates covers narrowband, wideband, and super-wideband up to fullband bandwidths. Users of IP-based telephony always demand high-quality audio. In addition to users’ expectation, their emotional state, content type, and many other psychological factors; network quality of service; and distortions introduced at the end terminals could determine their quality of experience. To measure the quality experienced by the end user for voice transmission service, the E-model standardized in the ITU-T Rec. G.107 (a narrowband version), ITU-T Rec. G.107.1 (a wideband version), and the most recent ITU-T Rec. G.107.2 extension for the super-wideband E-model can be used. In this work, we present a quality of experience model built on the E-model to measure the impact of coding and packet loss to assess the quality perceived by the end user in WebRTC speech applications. Based on the computed Mean Opinion Score, a real-time adaptive codec parameter switching mechanism is used to switch to the most optimum codec bitrate under the present network conditions. We present the evaluation results to show the effectiveness of the proposed approach when compared with the default codec configuration in WebRTC.
This paper presents an Edge-centric architecture along with a novel communication topology for a practical robotic telepresence solution. The system has been experimented in real-life. The subjective ...user experience is quantified through a simple yet effective technique. The efficacy of the protocol is also proven through experiments in practical deployment.
To provide remote assistance to people more efficiently, an augmented reality (AR)-based method for remote real-time assistance for collaboration is proposed. This paper aims to reduce communication ...barriers and enhance the three-dimensional (3D) feel of immersive interactions. First, a multiplayer real-time video communication framework with WebRTC is built, which enables remote experts to observe a first-hand view of an operator’s site. Second, a shared cross-platform virtual whiteboard based on Canvas, WebSocket and Node.js is developed that enables remote experts to provide visual assistance, such as drawings or text, and adjust the position of the whiteboard for seamless integration with video. Last, the virtual assistance information provided by the remote experts is displayed on the screen of AR holographic glasses to enhance the assistance capability of the platform and enable an expert to explain to an operator how to correctly perform tasks. A hybrid tracking and registration technique based on natural features and gyroscopes is adopted to estimate the operator’s posture in real time to enable the virtual assistance information to be perfectly integrated with the real world at all times. An experimental analysis shows that this system is both practicable and stable and has broad application prospects in many fields.
Improved Jitter Buffer Management for WebRTC Cinar, Yusuf; Pocta, Peter; Chambers, Desmond ...
ACM transactions on multimedia computing communications and applications,
04/2021, Letnik:
17, Številka:
1
Journal Article
Recenzirano
This work studies the jitter buffer management algorithm for Voice over IP in WebRTC. In particular, it details the core concepts of WebRTC’s jitter buffer management. Furthermore, it investigates ...how jitter buffer management algorithm behaves under network conditions with packet bursts. It also proposes an approach, different from the default WebRTC algorithm, to avoid distortions that occur under such network conditions. Under packet bursts, when the packet buffer becomes full, the WebRTC jitter buffer algorithm may discard all the packets in the buffer to make room for incoming packets. The proposed approach offers a novel strategy to minimize the number of packets discarded in the presence of packet bursts. Therefore, voice quality as perceived by the user is improved. ITU-T Rec. P.863, which also confirms the improvement, is employed to objectively evaluate the listening quality.
The release of new head-mounted displays (HMDs) are expected to drive higher demand for eXtended Reality (XR) services. In preparation for the demand, H.266 Versatile Video Coding (VVC) was proposed ...to effectively support highly immersive videos. In this paper, the H.266/VVC standard is introduced, protocols for real-time video streaming are surveyed. Finally, the test environment and energy modeling of the immersive video streaming on smartphones are presented.
WebRTC comprises a set of technologies and standards that provide real-time communication with web browsers, simplifying the embedding of voice and video communication in web applications and mobile ...devices. The perceived quality of WebRTC communication can be measured using quality of experience (QoE) indicators. QoE is defined as the degree of delight or annoyance of the user with an application or service. This paper is focused on the QoE assessment of WebRTC-based applications and its contribution is threefold. First, an analysis of how WebRTC topologies affect the quality perceived by users is provided. Second, a group of Key Performance Indicators for estimating the QoE of WebRTC users is proposed. Finally, a systematic survey of the literature on QoE assessment in the WebRTC arena is presented.
PDF
