Yu Guan

Peking University | PKU · Institute of Computer Science & Technology

The ultra-high-definition 16K Virtual Reality (VR) video is coming to ages with more ”real” virtual experience and less cybersickness. However, the huge bitrate and decoding overhead would overwhelm today’s network and mobile hardware. The widely-known Field-of-View (FoV) adaptation streaming method still has severe bitrate wastes and decoding over...

With the deployment of video streaming in 4G/5G mobile network, Content Delivery Networks (CDN) are extending to the network edge to provide end-users better Quality of Experience (QoE). However, small cache size and irregular request patterns make it a great challenge for edge caching in video content distribution. Most of the existing cache polic...

Streaming 360{\deg} videos requires more bandwidth than non-360{\deg} videos. This is because current solutions assume that users perceive the quality of 360{\deg} videos in the same way they perceive the quality of non-360{\deg} videos. This means the bandwidth demand must be proportional to the size of the user's field of view. However, we found...

In the last decades, network caches (Content Distribution Network, CDN) have been widely deployed in video delivery system. As cache has been pushed to network edge as far as possible, small cache size and irregular request pattern make it a great challenge for edge cache to catch popular video contents. Although we can apply cache admission polici...

Streaming 360° videos requires more bandwidth than non-360° videos. This is because current solutions assume that users perceive the quality of 360° videos in the same way they perceive the quality of non-360° videos. This means the bandwidth demand must be proportional to the size of the user's field of view. However, we found several quality-dete...

Server assignment is an essential part in Content Delivery Network (CDN), responsible for choosing a surrogate server to provide the best Quality of Service (QoS) for clients and balancing the server load. But it faces two critical challenges in practical: 1) the constraint of DNS schedule granularity makes it difficult to distribute client demands...

Minimizing total link cost in Information-Centric Network (ICN) by optimizing content placement is challenging in both effectiveness and practicality. To attain better performance, upstream link cost caused by a cache miss should be considered in addition to content popularity. To make it more practicable, a content placement strategy is supposed t...

This paper presents the design of Directed-Propagation Link-State Routing Protocol (DPLSR), which tries to address the issue of prefix flooding storm in NDN Link-state Routing Protocol. Since the number of data object is several order of magnitude of that of routers, legacy Link State Advertisements (LSAs) flooding model is no more appropriate in N...

Due to all kinds of need of customers and the complicated transmitting environment of digital image and video resources, numerous practical applications emerge, e.g. Image in painting, interpolation, super-resolution and the removal of salt and pepper noise. One thing these cases all have in common is that there are plenty of missing pixels randoml...