Mo Li

University of California, Los Angeles, Business, Department Member

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Underground structure monitoring with wireless sensor networks

Environment monitoring in coal mines is an important application of wireless sensor networks (WSN... more Environment monitoring in coal mines is an important application of wireless sensor networks (WSNs) that has commercial potential. We discuss the design of a Structure-Aware Self-Adaptive WSN system, SASA. By regulating the mesh sensor network deployment and formulating a collaborative mechanism based on a regular beacon strategy, SASA is able to rapidly detect structure variations caused by underground collapses. A prototype is deployed with 27 Mica2 motes. We present our implementation experiences as well as the experimental results. To better evaluate the scalability and reliability of SASA, we also conduct a largescale trace-driven simulation based on real data collected from the experiments.

format_quoteOver 50% of coal mine fatalities in the U.S. are due to structural collapses, making rapid detection essential for safety.format_quote

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Underground coal mine monitoring with wireless sensor networks

ACM Transactions on Sensor Networks, 2009

Environment monitoring in coal mines is an important application of wireless sensor networks (WSN... more Environment monitoring in coal mines is an important application of wireless sensor networks (WSNs) that has commercial potential. We discuss the design of a Structure-Aware Self-Adaptive WSN system, SASA. By regulating the mesh sensor network deployment and formulating a collaborative mechanism based on a regular beacon strategy, SASA is able to rapidly detect structure variations caused by underground collapses. We further develop a sound and robust mechanism for efficiently handling queries under instable circumstances. A prototype is deployed with 27 mica2 motes in a real coal mine. We present our implementation experiences as well as the experimental results. To better evaluate the scalability and reliability of SASA, we also conduct a large-scale trace-driven simulation based on real data collected from the experiments.

format_quoteCollapses accounted for over 50% of 480 annual coal mine fatalities in the U.S. over the past decade, emphasizing the need for rapid detection.format_quote

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Sea Depth Measurement with Restricted Floating Sensors

Sea depth monitoring is a critical task to ensure the safe operation of harbors. Traditional sche... more

Rendered path: range-free localization in anisotropic sensor networks with holes

IEEE/ACM Transactions on Networking, 2007

Sensor positioning is a crucial part of many location-dependent applications that utilize wireles... more Sensor positioning is a crucial part of many location-dependent applications that utilize wireless sensor networks (WSNs). Current localization approaches can be divided into two groups: range-based and range-free. Due to the high costs and critical assumptions, the range-based schemes are often impractical for WSNs. The existing range-free schemes, on the other hand, suffer from poor accuracy and low scalability. Without the help of a large number of uniformly deployed seed nodes, those schemes fail in anisotropic WSNs with possible holes. To address this issue, we propose the Rendered Path (REP) protocol. To the best of our knowledge, REP is the only range-free protocol for locating sensors with constant number of seeds in anisotropic sensor networks.

format_quoteREP addresses anisotropic network challenges where traditional methods fail, improving accuracy by correlating node-to-node distances despite path curvature.format_quote

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Iso-Map: Energy-Efficient Contour Mapping in Wireless Sensor Networks

Contour mapping is a crucial part of many wireless sensor network applications. Many efforts have... more Contour mapping is a crucial part of many wireless sensor network applications. Many efforts have been made to avoid collecting data from all the sensors in the network and producing maps at the sink, which is proven to be inefficient. The existing approaches (often aggregation based), however, suffer from heavy transmission traffic and incur large computational overheads on each sensor node. We propose Iso-Map, an energy-efficient protocol for contour mapping, which builds contour maps based solely on the reports collected from intelligently selected "isoline nodes" in wireless sensor networks. Iso-Map achieves high-quality contour mapping while significantly reducing the generated traffic from O(n) to O( n ), where n is the total number of sensor nodes in the field. The per-node computation overhead is also restrained as a constant. We conduct comprehensive trace-driven simulations to verify this protocol, and demonstrate that Iso-Map outperforms the previous approaches in the sense that it produces contour maps of high fidelity with significantly reduced energy cost.

format_quoteIso-Map intelligently selects specific nodes to report data, reducing computational overhead while maintaining contour map accuracy.format_quote

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A Survey on Topology issues in Wireless Sensor Network

Topology issues have received more and more attentions in Wireless Sensor Networks (WSN). While W... more Topology issues have received more and more attentions in Wireless Sensor Networks (WSN). While WSN applications are normally optimized by the given underlying network topology, another trend is to optimize WSN by means of topology control. A number of approaches have been invested in this area, such as topology directed routing, cooperating schemes, sensor coverage based topology control and network connectivity based topology control. Most of the schemes have proven to be able to provide a better network monitoring and communication performance with prolonged system lifetime. In this survey paper, we provide a full view of the studies in this area. By summarizing previous achievements and analyzing existed problems, we also point out possible research directions for future work .

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