A5015852316- Underwater Vehicles and Communication Systems
- Robotics and Sensor-Based Localization
- Indoor and Outdoor Localization Technologies
- Geophysical and Geoelectrical Methods
- Maritime Navigation and Safety
- Vibration and Dynamic Analysis
- Geophysical Methods and Applications
- Tunneling and Rock Mechanics
- Advanced machining processes and optimization
- Fault Detection and Control Systems
- Non-Destructive Testing Techniques
- Mechanical Failure Analysis and Simulation
- Drilling and Well Engineering
- Advanced Surface Polishing Techniques
- Robotic Path Planning Algorithms
- Distributed Sensor Networks and Detection Algorithms
- Geotechnical Engineering and Underground Structures
- Advanced Optical Sensing Technologies
- Image Processing Techniques and Applications
- Maritime Security and History
- Optical Wireless Communication Technologies
- Advanced Neural Network Applications
- Robotics and Automated Systems
- Mechanical stress and fatigue analysis
- Advanced Vision and Imaging
Korea Advanced Institute of Science and Technology
2013-2017
Among various sensors used to recognize obstacles in marine environments, vision are the most basic. Vision significantly affected by surrounding environment and cannot distant objects. However, despite these drawbacks, they can detect objects that radars nearby regions. They also small such as boats not equipped with an automatic identification system (AIS) or buoys. Thus, radar be a complementary manner. This paper proposes sensor-based model, called Skip-ENet, for recognizing real time....
This paper proposes a novel artificial intelligence vision-based monitoring system (AVMS) for ship berthing. To dock ship, it is necessary to accurately estimate the relative distance between quay wall and ship. However, maneuvering large ships near port complicated difficult procedure. Thus, tugboats push at berth under supervision of pilot, who receives information from berthing aid (BAS). The conventional BAS based on laser sensors, which most widely used approach, high-priced limited by...
Underground localization is considered a key technology for controlling underground equipment, such as directional drilling equipment. However, most sensors vision sensors, range and wireless cannot be utilized in an environment. Moreover, vibration by the drill bit distortion of geomagnetic field surrounding material adversely affect performance. To accurately estimate pose drilling, resilient method using concurrent normalized cross correlation (CNCC) magnetic vector proposed this paper....
With the development of unconventional gas, technology directional drilling has become more advanced. Underground localization is key technique for real-time path following and system control. However, there are problems such as vibration, disconnection with external infrastructure, magnetic field distortion. Conventional methods cannot solve these in real time or various environments. In this paper, a novel underground algorithm using re-measurement sequence pose graph SLAM (simultaneous...
As the conventional resource drains, importance of unconventional grows. A directional drilling system and a hydraulic fracturing method are required to gain resources. Nowadays, key technology is rotary steerable (RSS). Among several types RSS developed so far, ‘point-the-bit’ ‘push-the-bit’ most commonly used ones. In this paper, we introduce methods propose new hybrid-type system. This mechanism improves steering angle by taking advantages both types. Its control should be synchronized...
As the importance of unconventional resource grows, demand for directional drilling technology is increasing. One key technologies a rotary steerable system (RSS). Among several types RSS developed so far, `point-the-bit' and `push-the-bit' are most commonly used ones. In this paper, new using hybrid 4-pad introduced. This mechanism improves steering angle by taking advantages both types. We describe detailed structure kinematics system.
In this paper we present a method for solving an indoor relocation problem using ambient magnetic fields and radio sources. Specifically, exploit the field anomalies noisy ranges in environments. A robot with two magnetometers one active range sensor first explores unknown environment based on SLAM technique, gathering its path some useful multisensory observations. The gathered data is used to train multilayer perceptron either batch or stochastically. trained model then directly obtain...
Recently, shale gas has become an important energy source. Directional drilling is imperative technology when it comes to excavating because exists in underground horizontally spaced areas. A rotary steerable system (RSS) enables the effective directional drilling. In general, there are two types of RSS, point-the-bit and push-the-bit. this paper, a new hybrid type RSS proposed. The advantages both We expect that proposed can increase build-rate. effectiveness mechanism discussed by...
Underground localization is widely used for the directional drilling due to advances in unconventional resources. To mitigate accumulated errors, a novel underground algorithm using re-measurement of magnetic field and graph SLAM (simultaneous mapping) was proposed. However, since penetration length device very long, real-time not assured huge number nodes. reduce computation time, an method optimization augmented by pruning proposed this paper. The can remove nodes constraints that have low...