Song Han

Song Han
University of Connecticut | UConn · Department of Computer Science and Engineering

Ph.D.

About

157
Publications
45,677
Reads
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3,805
Citations
Introduction
Dr. Song Han's research interests include industrial IoT, cyber-physical systems and wireless powered communication. He has published over 120 scholarly works, including the Outstanding Paper Award in RTSS 2019, the Best Paper Award in ICII 2018, the Best Paper Award in RTSS 2013, the Best Paper Award Nomination in EMSOFT 2018 and the Best Paper Award Nomination in RTAS 2011. Dr. Han’s research is supported by NSF, NASA, US DOT, Emerson, TI, Microsoft Research, and UConn and UConn Health.
Additional affiliations
January 2006 - December 2012
University of Texas at Austin
January 2003 - December 2006
City University of Hong Kong

Publications

Publications (157)
Preprint
Full-text available
Applying high-speed real-time wireless technologies in industrial applications has the great potential to reduce the deployment and maintenance costs compared to their wired counterparts. Wireless technologies enhance the mobility and reduce the communication jitter and delay for mobile industrial equipment, such as mobile collaborative robots. Unf...
Preprint
Full-text available
Communication cost is the main bottleneck for the design of effective distributed learning algorithms. Recently, event-triggered techniques have been proposed to reduce the exchanged information among compute nodes and thus alleviate the communication cost. However, most existing event-triggered approaches only consider heuristic event-triggered th...
Preprint
Real-time end-to-end task scheduling in networked control systems (NCSs) requires the joint consideration of both network and computing resources to guarantee the desired quality of service (QoS). This paper introduces a new model for composite resource scheduling (CRS) in real-time networked control systems, which considers a strict execution orde...
Article
Full-text available
We consider the problem of resource provisioning for real-time cyber-physical applications in an open system environment where there does not exist a global resource scheduler that has complete knowledge of the real-time performance requirements of each individual application that shares the resources with the other applications. Regularity-based R...
Article
In this paper, we study the problem of fast constructions of source-wise round-trip spanners in weighted directed graphs. For a source vertex set S⊆V in a graph G(V,E), an S-sourcewise round-trip spanner of G of stretch k is a subgraph H of G such that for every pair of vertices u,v∈S×V, their round-trip distance in H is at most k times of their ro...
Conference Paper
The Routing Protocol for Low Power and Lossy Networks (RPL) was designed to meet the routing requirements of resource-constrained wireless networks to support different topologies as well as various Quality of Services (QoS). In RPL, nodes carefully select the best routes toward the root and avoid routing loops according to their locations in the n...
Article
In this paper, we present an advanced coherent receiver for the IEEE 802.15.4 offset-quadrature-phase-shift-keying (OQPSK) physical layer and provide an open-source implementation in the GNU Radio framework. Simulation and field test results show that the proposed receiver achieves about 11 dB power gain over an existing GNU Radio receiver, which t...
Chapter
This chapter gives an overview on various dynamic resource management frameworks for handling network dynamics in real-time wireless networks (RTWNs). The designs of these frameworks were driven by the specific objectives of achieving real-time and reliable data delivery in RTWNs with diversified constraints on network resource, device computation...
Conference Paper
RPL, the IPv6 Routing Protocol for Low-Power and Lossy Networks (LLNs), is widely used in resource-constrained wireless sensor networks. RPL is, however, vulnerable to internal routing attacks where compromised nodes may seek to exploit the vulnerability of the Rank value that represents the node's position relative to the root in the RPL graph. Th...
Article
The ever-growing threats of security and privacy loss from unauthorized access to mobile devices have led to the development of various biometric authentication methods for easier and safer data access. Gait-based authentication is a popular biometric authentication as it utilizes the unique patterns of human locomotion and it requires little coope...
Preprint
In this paper, we study the problem of efficiently constructing source-wise round-trip spanners in weighted directed graphs. For a source vertex set $S\subseteq V$ in a digraph $G(V,E)$, an $S$-source-wise round-trip spanner of $G$ of stretch $k$ is a subgraph $H$ of $G$ such that for every $u\in S,v\in V$, the round-trip distance between $u$ and $...
Conference Paper
Full-text available
Many emerging Industrial Internet of Things (IIoT) applications involve the use of mobile devices, such as sensors and robots in industrial automation scenarios. Movement of mobile sensor nodes causes intermittent connectivity which in turn deteriorates the network performance in terms of packet loss and delay. The Routing Protocol for Low Power an...
Article
Along with the rapid growth of Industrial Internet-of-Things (IIoT) applications and their penetration into many industry sectors, real-time wireless networks (RTWNs) have been playing a more critical role in providing real-time, reliable and secure communication services for such applications. A key challenge in RTWN management is how to ensure re...
Article
This paper explores how to optimize the freshness of real-time data for energy harvesting (EH) based networked embedded systems (NESs) with energy constraints. We introduce the concept of Age of Information (AoI) to quantitatively measure the data freshness and present a comprehensive analysis on the average AoI of the real-time data with stochasti...
Conference Paper
Full-text available
Blockchain is a distributed and decentralized ledger for recording transactions. It is maintained and shared among the participating nodes by utilizing cryptographic primitives. A consensus protocol ensures that all nodes agree on a unique order in which records are appended. However, current blockchain solutions are facing scalability issues. Many...
Preprint
The fast developing Industrial Internet of Things (IIoT) technologies provide a promising opportunity to build large-scale systems to connect numerous heterogeneous devices into the Internet. Most existing IIoT infrastructures are based on a centralized architecture, which is easier for management but cannot effectively support immutable and verifi...
Article
Energy harvesters are becoming increasingly popular as power sources for IoT edge devices. However, one of the intrinsic problems of energy harvester is that harvesting power is often weak and frequently interrupted. Therefore, energy harvesting powered edge devices have to work intermittently. To maintain execution progress, execution states need...
Article
We consider the problem of clustering graph nodes over large-scale dynamic graphs, such as citation networks, images and web networks, when graph updates such as node/edge insertions/deletions are observed distributively. We propose communication-efficient algorithms for two well-established communication models namely the message passing and the b...
Conference Paper
This paper explores how to optimize the freshness of real-time data in energy harvesting based networked embedded systems. We introduce the concept of Age of Information (AoI) to quantitatively measure the data freshness and present a comprehensive analysis on the average AoI of the real-time data with stochastic update arrival and energy replenish...
Article
Graph sparsification has been used to improve the computational cost of learning over graphs, e.g., Laplacian-regularized estimation, graph semisupervised learning (SSL) and spectral clustering (SC). However, when graphs vary over time, repeated sparsification requires polynomial order computational cost per update. We propose a new type of graph s...
Article
Full-text available
The adoption of real-time wireless technologies within the ever-growing field of networked industrial control systems is continuously gaining popularity. Widespread sensing and actuation devices based on high-throughput wireless standards allow for an increased system mobility and lower configuration and maintenance costs. The IEEE 802.11 standard,...
Article
Full-text available
This paper presents a methodology to design and utilize a supervisory controller for networked power converters in residential applications. Wireless networks have been interfaced to multiple power factor correction (PFC) converters which are proposed to support reactive power. Unregulated reactive power support from PFC converters could cause reac...
Article
Applying wireless technologies in cyber-physical systems (CPSs) has received significant attention in recent years. In our previous work, a high-speed and flexible real-time wireless communication protocol called RT-WiFi was designed to support a wide range of CPSs, and we presented an implementation with a single access point (AP). To serve the CP...
Preprint
Full-text available
Along with the rapid growth of Industrial Internet-of-Things (IIoT) applications and their penetration into many industry sectors, real-time wireless networks (RTWNs) have been playing a more critical role in providing real-time, reliable and secure communication services for such applications. A key challenge in RTWN management is how to ensure re...
Preprint
We consider the problem of clustering graph nodes over large-scale dynamic graphs, such as citation networks, images and web networks, when graph updates such as node/edge insertions/deletions are observed distributively. We propose communication-efficient algorithms for two well-established communication models namely the message passing and the b...
Article
Full-text available
Real-time wireless networks (RTWNs) are fundamental to many Internet-of-Things (IoT) applications. RTWNs typically apply time-division multiple access (TDMA)-based media access control mechanisms and often demand deterministic end-to-end packet delivery to meet the given quality of service (QoS) requirements. Packet scheduling in an RTWN thus plays...
Article
Full-text available
With the ever-growing interests in applying wireless technologies for networked embedded systems to serve as the communication fabric, many real-time wireless technologies have been recently developed to support time-critical sensing and control applications. We proposed in previous work the RT-WiFi protocol that provides real-time high-speed predi...
Article
Maintaining the temporal validity of real-time data in cyber-physical systems is of critical importance to ensure the correct decision making and appropriate system operation. Most existing work on real-time data retrieval assume that the real-time data under study are always available for retrieval. This assumption, however does not hold in many r...
Article
Maintaining the temporal validity of real-time data in Cyber-Physical Systems (CPS) is of critical importance to ensure correct decision making and appropriate system operation. Most existing work on real-time data retrieval assumes that the real-time data under study are always available, and the developed scheduling algorithms mainly focus on mak...
Article
Full-text available
Internet of Things (IoT) is an emerging domain that promises ubiquitous connection to the Internet, turning common objects into connected devices. The IoT paradigm is changing the way people interact with things around them. It paves the way to creating pervasively connected infrastructures to support innovative services and promises better flexibi...
Article
The world is experiencing an unprecedented, enduring, and pervasive aging process. With more people who need walking assistance, the demand for lower-extremity gait rehabilitation has increased rapidly over the years. The current clinical gait rehabilitative training requires heavy involvement of both medical doctors and physical therapists and thu...
Article
Full-text available
The papers in this special section examine the deploying of industrial wireless sensor networks as it applies to the industrial Internet of Things. Industrial networks connect sensors and actuators in various industrial facilities, such as oil and gas production facilities, paper plants, car manufactories, and underground mines. Industrial Internet...
Article
Full-text available
In most process control systems nowadays, process measurements are periodically collected and archived in historians. Analytics applications process the data, and provide results offline or in a time period that is considerably slow in comparison to the performance of the manufacturing process. Along with the proliferation of Internet-of-Things (Io...
Conference Paper
6TiSCH network architecture has recently been introduced to combine the high reliability and low-power consumption of the TSCH (Time-Slotted Channel Hopping) mode of IEEE 802.15.4e MAC with the ease of integration offered by the IP-enabled upper layer protocols. 6TiSCH network uses RPL (Routing Protocol for Low Power and Lossy Networks) as its rout...
Article
Networked Microgrids (NMGs) offer a new, more resilient alternative to traditional individual Microgrids (MGs). Even though networking existing microgrids presents clear advantages, the scalable and resilient communication and control infrastructure necessary for supporting this innovation does not yet exist. This paper addresses this challenge by...
Article
The world is experiencing an unprecedented, enduring, and pervasive aging process. With more people who need walking assistance, the demand for gait rehabilitation has increased rapidly over the years. Effective gait rehabilitation requires a comprehensive gait analysis, in which gait phase detection plays an important role. Although many specializ...
Article
Unknown time delay poses a significant challenge to the design of networked motion control systems. Moreover, modeling uncertainties, mechanical disturbance, and sensor noise coexist with time delay in such systems, which makes the controller synthesis even more challenging. It has been proven effective to model the time delay as fictitious disturb...
Article
Full-text available
In this paper, by applying motion detection and machine learning technologies, we have designed and developed an activity tracking and monitoring system, called SmartMind, to help Alzheimer’s Disease (AD) patients to live independently within their living rooms while providing emergency assistances and supports when necessary. Allowing AD patients...