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Go to Section. Home Operations Research Vol. Cynthia Barnhart. Ellis L. George L. Martin W. Pamela H. Published Online: 1 Jun Previous Back to Top. Figures References Related Information Cited By A decomposed branch-and-price procedure for integrating demand planning in personnel staffing problems. Scheduling with uncertain processing times in mixed-criticality systems. Vehicle scheduling problem with loss in bus ridership. ADMM-based problem decomposition scheme for vehicle routing problem with time windows. The re-planning and scheduling of surgical cases in the operating room department after block release time with resource rescheduling.
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Solving large-scale fixed cost integer linear programming models for grid-based location problems with heuristic techniques. Timetabling and assignment problems in railway planning and integer multicommodity flow. An exact solution approach for the order batching problem. They watched a short part of 3D version of Avatar trailer which general features are shown in Table 1.
Video Avrg. Despite of using IEEE At first many WiFi networks were accessible in the department laboratory where our experiment was carried out and other WiFi networks used same channels for carrying which is shown in Figure 2 and Table 2. This throughput also prevented to get convenient vision quality during the watching. In first case mean value of result scores was 4. Scores were always recorded by the test persons for 5 important viewpoints mentioned above.
Other subjective tests with distorted 3D video contents were carried out on these two PCs in same time and each of them was connected to different AP in the way mentioned above. We can say even based on reference tests that 3D content delivery though the WiFi network is more sensitive and less effective comparing results with first or second investigation results where we could carry out measurements on 4 PCs with mean value of QoE 4.
Participants perceived quality of 3D presentation also by quality of stereo shooting like depth of scenes. For this reason we did not disturb 3D video transport by jitter increase or jitter increase combined with bandwidth limitation but only with bandwidth limitation. We counted weighted averages by formula 3 based on gathered scores and weights. Summary of results are shown in Table 3.
Therefore bandwidth was set to 5, 4. Figure 3 QoE degradation based on bandwidth limitation Appropriate mathematical descriptions were calculated by the Wolfram Alpha application. Applying the method of least squares we got solutions: 3. We can recognize from Figure 3 that 3D film delivering through The middle line shows combined results of these two channels information when started mean weighted QoE was only 3. This was caused by the highest motion level scenes when the data sequences stuck shown in Figure 4 but these critical situations soon were persisted.
Figure 5 in middle shows line of weighted averages of all results 3. The buffered playing time increase also could help to raise resistivity against QoS degradation  but we did not change this value. Video contents were transported in unicast mode based on TCP protocol and were played on two PCs in the same time.
The relationship between QoE and QoS was shown based on gathered data for 3D stereoscopic multimedia content but the good quality guarantee is more complex in case of WiFi network. QoE is influenced by nature of wireless technology like bandwidth limitation or channel interferences and by QoS level in transport network as well. Gathered data show that people who had watched 3D movie before this experiment 32 from 36 participants were more critical to any quality differences. We can emphasize that for good QoE of 3D stereoscopic contents delivery through WiFi network the demanded bandwidth should be provided.
Our results also show that quality of 3D presentation is also strongly influenced by quality of stereo shooting and 3D production. Researchers working in vision and graphics are attempting to develop new techniques and technologies to overcome the current limitations in 3D stereoscopic presentation. Primary importance of QoE investigation in wireless transport network environment is came to the front due to the worldwide growing of video-streams presentation on smart but small mobile devices.
Therefore future work will address investigation of gathered information from experiments carried out with smart mobile devices on client sides and all research works results in the subject: investigation of QoE — QoS relationship for 3D stereoscopic videos delivery can be used in future research work. The goal is mathematical modeling of functional relationship between QoE and QoS metrics which is needed for optimal solution of 3D stereoscopic video contents delivery with appropriate display quality.
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