2014, Vol.9, No.2

Journal of Knowledge Information Technology and Systems 2023 KCI Impact Factor : 0.89

pISSN : 1975-7700 / eISSN : 2734-0570
https://journal.kci.go.kr/kkits

It should be considered effective quality measurement scheme to stably provide various realtime TV services such as IPTV, WebTV, SmartTV over IP-based networks which provide best-effort services. In this study we have presented No-Reference S/W tools in order to objectively measure video quality of realtime TV services using the network-related QoS metrics and user-related QoE metrics. We have compared with commercially available measuring instruments to verify validity of our objective quality assessment scheme using the network-related QoS metrics. Also We have compared with subjective quality assessment by expert group to verify validity of our objective quality assessment scheme using the user-related QoE metrics.

This study developed an adaptive e-learning system that could provide effective instruction methods. The proposed adaptive e-learning system classified learning content into the conceptional content, principal content, and procedural content; and, by providing an appropriate conceptual model, inquiry model, and cognitive-apprehensive model, developed an effective instructional method. The proposed adaptive e-learning system was applied to college students and the learning effects were analyzed. The learners were divided into an experimental group and comparative group for an analysis of the learning effects. An independent t-test was performed for the experimental research. The results indicate that the proposed adaptive e-learning system produced highly improved learning achievement. In addition, the proposed adaptive e-learning system resulted in positive effects in both male and female learner groups.

In this paper, the motion-haptic feedback system is presented in order to provide the same sensation to players as if they enjoys a real ski on ski slope. For maximizing immersive sensation, player’s motion is measured by two inertia measurement units (IMUs) and the measured motion is used for natural interaction with virtual environment. To simulate the behavior of player’s ski plates, three timing belts and five DC motors are incorporated into the proposed system. The three-timing belts and three-DC motors are also used in order to provide horizontal acceleration to players. Furthermore, two additional DC motors are applied to the proposed system for creating forward-backward acceleration. Therefore, the players can sense realistic motion-haptic feedback as if they enjoy real ski on ski slope.