Jun Liu

Jun Liu
Jilin University | JUT · Department of Business Administration

About

54
Publications
6,303
Reads
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857
Citations
Citations since 2016
35 Research Items
672 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140

Publications

Publications (54)
Article
Full-text available
With the increasing demand for underwater resource exploration, three-dimensional (3D) reconstruction technology is important for searching for lost underwater civilizations, underwater shipwrecks, or seabed structures. However, faced with the limitations of underwater unmanned systems in terms of energy, bandwidth, and transmission delay, 3D recon...
Article
Performing effective medium access control (MAC) encounters great challenges for mobile underwater acoustic networks (UANs), because it suffers from low signal-to-noise ratio, Doppler shift, large communication latency, and so on. Multi-carrier code-division multiple access (MC-COMA) is a promising modulation technique appropriate for solving the a...
Article
Digital Subtraction Angiography (DSA) has become an essential method in diagnosing and detecting vascular bleeding points. According to the frame number sequence, doctors subjectively analyze gray-black DSA data to diagnose vascular bleeding points. This study carried out parametric color imaging processing on the original two-dimensional DSA image...
Article
Providing qualified and sustainable communications is one of the key challenges for the Internet of Underwater Things (IoUTs) facing constrained energy supplements, non-stationary environments, and severe communication interference. Owing to spatial separation, several nodes can (and are often required to) make transmissions simultaneously to maxim...
Article
Underwater Acoustic Sensor Networks (UASNs) have been widely applied in marine monitoring, military reconnaissance, hydrology surveys, etc. Their location information is an important apriori knowledge when they are carried out underwater. However, the complex underwater environments impose great challenges on location acquisition, especially for Au...
Article
Full-text available
At present, the key to underwater sensor network (UWSN) research is to provide personalized network support for many underwater applications. In order to achieve this goal, people need a general UWSN. Most of the current UWSN architecture is based on the traditional network, which are limited to a single hardware platform and software platform. Fac...
Article
Full-text available
In the mammalian brain, alternative pre-mRNA splicing is a fundamental mechanism that modifies neuronal function dynamically where secretion of different splice variants regulates neurogenesis, development, pathfinding, maintenance, migration, and synaptogenesis. Sequence-specific RNA-Binding Protein CPEB3 has distinctive isoform-distinct biochemic...
Article
Full-text available
With the cost reduction of underwater sensor network nodes and the increasing demand for underwater detection and monitoring, near-land areas, shallow water areas, lakes and rivers have gradually tended to densely arranged sensor nodes. In order to achieve real-time monitoring, most nodes now have visual sensors instead of acoustic sensors to colle...
Article
Low-cost, long-endurance navigation is a crucial universal supporting technology for long-range underwater vehicles while entering, exploring, and developing the deep sea. To overcome the limitations of existing navigation systems (e.g., high cost and unsuitability for long-endurance operation), this study proposes a cooperative navigation system b...
Article
Full-text available
Underwater acoustic and optical data fusion has been developed in recent decades. Matching of underwater acoustic and optical images is a fundamental and critical problem in underwater exploration because it usually acts as the key step in many applications, such as target detection, ocean observation, and joint positioning. In this study, a method...
Article
Full-text available
The emerging Internet of Underwater Things (IoUT) and deep learning technologies are combined to provide a novel, intelligent, and efficient data processing and analyzing schema, which facilitates the sensing and computing abilities for the smart ocean. The underwater acoustic (UWA) communication network is an essential part of IoUT. The thermoclin...
Article
For an Autonomous Underwater Vehicle (AUV), navigation is a key functionality. Dead-Reckoning (DR) navigation is an important class among all the AUV navigation methods. In DR, the measurement errors of inertial sensors (such as gyroscopes and accelerometers) lead to accumulated errors with time, which affect navigation accuracy significantly. Espe...
Article
As one of the most promising networks, the spaceair-ground-aqua integrated network (SAGAIN) has the characteristics of wide coverage and large information capacity, which can meet various requests from users in different domains. With the rapid growth of data and information generated by the Internet of Things (IoT), SAGAIN has received much attent...
Article
Full-text available
Deployment of surface-level gateways holds potential as an effective method to alleviate high-propagation delays and high-error probability in an underwater wireless sensor network (UWSN). This promise comes from reducing distances to underwater nodes and using radio waves to forward information to a control station. In an UWSN, a dynamic energy ef...
Conference Paper
we propose a method of Cloud-Ocean Computing to push the intelligent processing of the data to the front end. Ocean Computing and Cloud Computing work together, Ocean Computing is an important support for Cloud Computing. For Ocean Computing, we put forward two ways. The first way is to take a compressed sensing method which extracts valuable infor...
Conference Paper
Underwater acoustic WiFi (UWA-WiFi) network is similar to the traditional terrestrial WiFi network, which provides wireless access services for underwater nodes (e.g., marine engineering equipment, underwater vehicles, divers, sensors, and so on). MAC protocol design is an essential issue for UWA-WiFi network. Due to the natures of low available ba...
Conference Paper
This paper carries out a refinement on the basis of existing data sets, whose level of granularity is not available for some experimental analysis such as thermocline research. The thermocline is sensitive to thermohaline data granularity for sudden sea temperature changes. We reined the data with the KNN regression method and managed to choose the...
Conference Paper
In this paper, we present a light-weight protocol stack architecture for UWASN called SO-Link. It is an education-friendly framework of UWASN protocol stack. It will help the beginners to acquaint with the underwater acoustic communication, and to understand the main principles of UWASN. We also provide clear and usable interfaces for UWASN protoco...
Conference Paper
Existing ocean visualization studies are usually conducted independently using either sonar or optical imaging. However, they have shortcomings in different engineering applications. Acoustic imaging is not comprehensive enough to show the details of the target, and the perspective of optical imaging is not extensive enough. Combining the advantage...
Article
Full-text available
A reliable energy-efficient routing protocol plays a key role in underwater data transmission. In the face of acoustic communication challenges in underwater wireless sensor networks (UWSNs), including long propagation delay, topology change, limited energy, and communication voids, we propose RECRP, a Reliable Energy-efficient Cross-layer Routing...
Article
Full-text available
Changes in ocean temperature over time have important implications for marine ecosystems and global climate change. Marine temperature changes with time and has the features of closeness, period, and trend. This paper analyzes the temporal dependence of marine temperature variation at multiple depths and proposes a new ocean-temperature time-series...
Article
Autonomous underwater vehicles (AUVs) form mobile underwater networks to conduct underwater surveying missions cooperatively. Due to the severe turbulence caused by water currents, individual AUV has to adjust its heading constantly to ensure reaching destination. The coordinated AUV network increases the size of the surveying area, but leads to bi...
Conference Paper
the accuracy of the Autonomous Underwater Vehicles (AUVs) navigation system determines whether they can safely operate and return. Traditional Dead-reckoning (DR) relies on the inertial sensors such as gyroscope and accelerometer. A major challenge for DR navigation is from measurement error of the inertial sensors (gyroscope, accelerometer, etc.),...
Conference Paper
The Earth is a water planet. The ocean is used for nature resource exploitation, fishery, etc., and it also plays critical roles in global climate regulation and transportation. Consequently, it is extremely important to keep track of its condition. And thus ocean observation systems have received increasing attentions.
Conference Paper
This paper presents a simulator for swarm operations designed to verify algorithms for a swarm of autonomous underwater robots (AUVs), specifically for constructing an underwater communication network with AUVs carrying acoustic communication devices. This simulator consists of three nodes: a virtual vehicle node (VV), a virtual environment node (V...
Article
A wireless oceanographic system is an underwater wireless-networked sensing system for oceanographic data collection, remote monitoring, and control. It represents a cutting-edge technology that could eliminate the need of long and expensive subsea cables while featuring real-time acquisition, flexible, and convenient deployment. Mainly powered by...
Conference Paper
Autonomous Underwater Vehicles (AUV) maintain their location information during navigation in order to reach a pre-determined destination. Most of previous underwater localization approaches assume that all AUVs are within one hop, which severely restricts the scale of the AUVs. In this paper, we localize AUVs in a multihop Mobile Underwater Wirele...
Article
Full-text available
Energy efficiency and mobility robustness are two of the main performance metrics to be addressed when designing any rout-ing protocol for underwater sensor network (UWSN). Energy efficiency leads to a prolonged network life time, while mobility robustness ensures high and stable delivery ratio. Most of the routing strategies designed for UWSN requ...
Article
Time synchronization and localization are basic services in a sensor network system. Although they often depend on each other, they are usually tackled independently. In this work, we investigate the time synchronization and localization problems in underwater sensor networks, where more challenges are introduced because of the unique characteristi...
Article
Recent technology advancements have enabled autonomous underwater vehicles to play a more significant role in sea exploration. The vehicles' mobility gives them advantages in many applications. It however poses new challenges that are often much less significant for fixed stations. Self localization is one such problem. This paper introduces a new...
Conference Paper
Swarms of autonomous underwater vehicles (AUVs) forming mobile underwater networks often operate in moving currents, which introduce severe turbulence that interferes with coordinated and stealthy navigation of fleet. Therefore, individual AUV must adjust their heading whenever needed to ensure it can reach a pre-determined destination. To achieve...
Article
Time synchronization plays a critical role in distributed network systems. In this paper, we investigate the time synchronization problem in the context of underwater sensor networks (UWSNs). Although many time-synchronization protocols have been proposed for terrestrial wireless sensor networks, none of them can be directly applied to UWSNs. This...
Article
In underwater acoustic sensor network, deploying multiple surface-level radio capable gateways is an efficient way to alleviate the burdens of high propagation delay and high error probability during transmission. However, the locations of gateways need to be carefully selected to maximize the benefit in a cost-effective way. In this paper, we pres...
Conference Paper
The performance of Underwater Sensor Networks (UWSNs) can be severely affected by the dynamics of underwater environment. A surface sink is usually deployed at a pre-specified location to maximize one or more performance metrics. However, when the network is dynamic, a redeployment of surface sink should be considered to reduce the effect of mobili...
Article
Full-text available
The performance of underwater sensor networks (UWSNs) is greatly limited by the low bandwidth and high propagation delay of acoustic communications. Deploying multiple surface-level radio-capable gateways can enhance UWSN performance metrics, reducing end-to-end delays and distributing traffic loads for energy reduction. In this paper, we study the...
Conference Paper
High-speed rail (HSR) holds promise as an investment to modernize our country's transportation infrastructure and serve as a driver for our national economy. The five-hundred billion dollar price tag necessitates thorough analysis and planning upfront to ensure long-term success, including a well formulated vulnerability analysis to identify an opt...
Conference Paper
Ensuring transportation network security is one of the most daunting challenges confronting homeland security agencies today. Significant research has been dedicated to model and analyze the vulnerability of transportation systems, yet notably fewer studies propose specific strategies for deploying defensive technologies to safeguard these systems....
Conference Paper
In underwater wireless sensor networks (UWSNs), one efficient way to alleviate the burdens of high propagation delay and high error probability during transmission is to deploy surface-level gateways, which utilize radio waves to forward information to a control station. Usually, deployment of the gateways is considered as an optimization problem w...
Conference Paper
Time synchronization and localization are basic services in a sensor network system. Although they often depend on each other, they are usually tackled independently. In this work, we investigate time synchronization and localization problems in underwater sensor networks. We propose a joint solution for localization and time synchronization, in wh...
Conference Paper
Time synchronization plays a critical role in distributed network systems. In this paper, we investigate the time synchronization problem in the context of underwater sensor networks (UWSNs). We propose a pairwise, cross-layer, time synchronization scheme for mobile underwater sensor networks, called TSMU. Facilitated by the Kalman Filter, the prop...
Conference Paper
In this paper, we present a networked acoustic modem system (NAMS) by integrating a high-speed OFDM modem and a comprehensive underwater network protocol stack for underwater applications. This integrated system allows different underwater network protocols to run on top of the OFDM modem platform and can provide high-speed, reliable and efficient...
Conference Paper
Full-text available
In recent years, new challenges and emerging applications have inspired increasing research interests in the area of underwater networks. However, field experiments are expensive and not all the research work can be evaluated in real world scenarios in a timely fashion. This motivates our interest on developing an affordable, accessible and user fr...
Conference Paper
Full-text available
Time synchronization is a critical service for distributed network systems. In this work, we investigate this problem in the context of underwater sensor networks (UWSNs). Although there are many time synchronization protocols proposed for terrestrial wireless sensor networks, none of them could be directly applied to UWSNs. This is because most of...
Article
In this paper, we present a networked acoustic modem system (NAMS) by integrating a high-speed OFDM modem and a comprehensive underwater network protocol stack for underwater applications. This integrated system allows different underwater network protocols to run on top of the OFDM modem platform and can provide high-speed, reliable and efficient...

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