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Documents authored by Feng, Xin

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Feng, Xin

Document
DOI: 10.4230/LIPIcs.GISCIENCE.2018.12
Heterogeneous Skeleton for Summarizing Continuously Distributed Demand in a Region

Authors: Alan T. Murray, Xin Feng, and Ali Shokoufandeh

Published in: LIPIcs, Volume 114, 10th International Conference on Geographic Information Science (GIScience 2018)

Abstract
There has long been interest in the skeleton of a spatial object in GIScience. The reasons for this are many, as it has proven to be an extremely useful summary and explanatory representation of complex objects. While much research has focused on issues of computational complexity and efficiency in extracting the skeletal and medial axis representations as well as interpreting the final product, little attention has been paid to fundamental assumptions about the underlying object. This paper discusses the implied assumption of homogeneity associated with methods for deriving a skeleton. Further, it is demonstrated that addressing heterogeneity complicates both the interpretation and identification of a meaningful skeleton. The heterogeneous skeleton is introduced and formalized, along with a method for its identification. Application results are presented to illustrate the heterogeneous skeleton and provides comparative contrast to homogeneity assumptions.
Cite as

Alan T. Murray, Xin Feng, and Ali Shokoufandeh. Heterogeneous Skeleton for Summarizing Continuously Distributed Demand in a Region. In 10th International Conference on Geographic Information Science (GIScience 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 114, pp. 12:1-12:11, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{murray_et_al:LIPIcs.GISCIENCE.2018.12,
  author =	{Murray, Alan T. and Feng, Xin and Shokoufandeh, Ali},
  title =	{{Heterogeneous Skeleton for Summarizing Continuously Distributed Demand in a Region}},
  booktitle =	{10th International Conference on Geographic Information Science (GIScience 2018)},
  pages =	{12:1--12:11},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-083-5},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{114},
  editor =	{Winter, Stephan and Griffin, Amy and Sester, Monika},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.GISCIENCE.2018.12},
  URN =		{urn:nbn:de:0030-drops-93400},
  doi =		{10.4230/LIPIcs.GISCIENCE.2018.12},
  annote =	{Keywords: Medial axis, Object center, Geographical summary, Spatial analytics}
}

Xin, Yufeng

Document
DOI: 10.4230/LIPIcs.ECRTS.2017.25
A Linux Real-Time Packet Scheduler for Reliable Static SDN Routing

Authors: Tao Qian, Frank Mueller, and Yufeng Xin

Published in: LIPIcs, Volume 76, 29th Euromicro Conference on Real-Time Systems (ECRTS 2017)

Abstract
In a distributed computing environment, guaranteeing the hard deadline for real-time messages is essential to ensure schedulability of real-time tasks. Since capabilities of the shared resources for transmission are limited, e.g., the buffer size is limited on network devices, it becomes a challenge to design an effective and feasible resource sharing policy based on both the demand of real-time packet transmissions and the limitation of resource capabilities. We address this challenge in two cooperative mechanisms. First, we design a static routing algorithm to find forwarding paths for packets to guarantee their hard deadlines. The routing algorithm employs a validation-based backtracking procedure capable of deriving the demand of a set of real-time packets on each shared network device, and it checks whether this demand can be met on the device. Second, we design a packet scheduler that runs on network devices to transmit messages according to our routing requirements. We implement these mechanisms on virtual software-defined network (SDN) switches and evaluate them on real hardware in a local cluster to demonstrate the feasibility and effectiveness of our routing algorithm and packet scheduler.
Cite as

Tao Qian, Frank Mueller, and Yufeng Xin. A Linux Real-Time Packet Scheduler for Reliable Static SDN Routing. In 29th Euromicro Conference on Real-Time Systems (ECRTS 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 76, pp. 25:1-25:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{qian_et_al:LIPIcs.ECRTS.2017.25,
  author =	{Qian, Tao and Mueller, Frank and Xin, Yufeng},
  title =	{{A Linux Real-Time Packet Scheduler for Reliable Static SDN Routing}},
  booktitle =	{29th Euromicro Conference on Real-Time Systems (ECRTS 2017)},
  pages =	{25:1--25:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-037-8},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{76},
  editor =	{Bertogna, Marko},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2017.25},
  URN =		{urn:nbn:de:0030-drops-71707},
  doi =		{10.4230/LIPIcs.ECRTS.2017.25},
  annote =	{Keywords: Real-time Networks, Packet Scheduling, Deadline Guarantee}
}
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