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—Over years, virtual backbone has attracted lots of attentions as a promising approach to deal with the broadcasting storm problem in wireless networks. One popular way to construct a quality virtual backbone is to solve the minimum connected dominating set problem. However, a virtual backbone computed in this way is not resilient against topology change… (More)

—A Virtual Backbone (VB) of a wireless network is a subset of nodes such that only VB nodes are responsible for routing-related tasks. Since a smaller VB causes less overhead, size is the primary quality factor of VB. Frequently, Unit Disk Graphs (UDGs) are used to model 2D homogeneous wireless networks, and the problem of finding minimum VBs in the… (More)

—In this paper, we study the problem of constructing quality fault-tolerant Connected Dominating Sets (CDSs) in homogeneous wireless networks, which can be defined as minimum k-Connected m-Dominating Set ((k, m)-CDS) problem in Unit Disk Graphs (UDGs). We found that every existing approximation algorithm for this problem is incomplete for k ≥ 3 in a sense… (More)

Previously, we proposed Minimum Average Routing Path Clustering Problem (MARP-CP) in multi-hop USNs. The goal of this problem is to find a clustering of a USN so that the average clustering-based routing path from a node to it nearest underwater sink is minimized. We relaxed MARPCP to a special case of Minimum Weight Dominating Set Problem (MWDSP), namely… (More)

The multiple UnderWater Sink (UW-Sink) architecture is introduced to resolve the scal-ability problem in USNs. To maximize the benefit of this architecture, the UW-Sinks should be located carefully. Previously, we proposed Minimum d-Hop UW-Sink Placement Problem (MdHUWSPP) for time-sensitive applications, whose objective is minimizing the number of UW-Sinks… (More)

—This paper considers the problem of computing the optimal trajectories of multiple mobile elements (e.g. robots, vehicles, etc.) to minimize data collection latency in wireless sensor networks (WSNs). By relying on slightly different assumption , we define two interesting problems, the k-traveling salesperson problem with neighborhood (k-TSPN) and the… (More)

- Wei Wang, Donghyun Kim, Min Kyung An, Wei Gao, Xianyue Li, Zhao Zhang +1 other
- IEEE/ACM Trans. Netw.
- 2013

In this paper, we study the problem of computing quality fault-tolerant virtual backbone in homogeneous wireless network, which is defined as the <i>k</i>-connected <i>m</i>-dominating set problem in a unit disk graph. This problem is NP-hard, and thus many efforts have been made to find a constant factor approximation algorithm for it, but never succeeded… (More)

In this paper, we introduce a new clustering problem in underwater sensor networks, namely minimum average routing path clustering problem (MARPCP). To deal with the high complexity of MARPCP, we relax it to a special case of minimum weight dominating set problem (MWDSP). We show an existing algorithm for MWDSP can produce an approximate solution for… (More)

- Donghyun Kim, Wei Wang, Nassim Sohaee, Changcun Ma, Weili Wu, Wonjun Lee +1 other
- IEEE/ACM Trans. Netw.
- 2011

In this paper, we propose a new multiple-sink positioning problem in wireless sensor networks to best support real-time applications. We formally define this problem as the <i>k</i>-Sink Placement Problem (<i>k</i>-SPP) and prove that it is APX-complete. We show that an existing approximation algorithm for the well-known -center problem is a constant factor… (More)

—This paper investigates the problem of computing the optimal trajectories of multiple data MULEs (e.g. robots, vehicles, etc.) to minimize data collection latency in wireless sensor networks. By relying on slightly different assumption, we define two interesting problems, the k-traveling salesperson problem with neighborhood (k-TSPN) and the k-rooted path… (More)