Results 31 to 40 of about 618,605 (167)

Look-Ahead Distance of a fiber probe used to assist neurosurgery: Phantom and Monte Carlo study

Optics Express, 2003
A short-separation, optical reflectance probe has been developed to assist the neurosurgeon in functional neurosurgery for accurate localization of the surgical target. Because of the scattering nature of tissue, the optical probe has a "Look Ahead Distance" (LAD), at which the measured optical reflectance starts to "see" or "sense" the underlying ...
Zhiyu, Qian, Sundar, Victor, Yueqing, Gu, Cole, Giller, Hanli, Liu   +4 more
openaire   +2 more sources

Optimization and Analysis of Sensitive Areas for Look-Ahead Electromagnetic Logging-While-Drilling Based on Geometric Factors

Energies
Look-ahead electromagnetic (EM) logging-while-drilling (LWD) plays an indispensable role in the prediction of deep and ultra-deep reservoirs. Traditional electromagnetic logging-while-drilling (EMLWD) and ultra-deep EMLWD technologies exhibit certain ...
Guoyu Li, Zhenguan Wu, Xiaoqiao Liao, Xizhou Yue, Xiang Zhang, Tianlin Liu, Yunxin Zeng   +6 more
doaj   +1 more source

Look-ahead strategies for dynamic pickup and delivery problems [PDF]

, 2010
In this paper we consider a dynamic full truckload pickup and delivery problem with time-windows. Jobs arrive over time and are offered in a second-price auction. Individual vehicles bid on these jobs and maintain a schedule of the jobs they have won. We
Heijden, Matthieu van der, Mes, Martijn, Schuur, Peter   +2 more
core   +3 more sources

Research on Path Tracking Technology for Tracked Unmanned Vehicles Based on DDPG-PP

Machines
Realizing path tracking is crucial for improving the accuracy and efficiency of unmanned vehicle operations. In this paper, a path tracking hierarchical control method based on DDPG-PP is proposed to improve the path tracking accuracy of tracked unmanned
Yongjuan Zhao, Chaozhe Guo, Jiangyong Mi, Lijin Wang, Haidi Wang, Hailong Zhang   +5 more
doaj   +1 more source

Multistep Prediction Analysis of Pure Pursuit Method for Automated Guided Vehicles in Aircraft Industry

Actuators
The pure pursuit (PP) method has been widely employed in automated guided vehicles (AGVs) to address path tracking challenges. However, the traditional pure pursuit method exhibits certain limitations in tracking performance.
Biling Wang, Gaojian Fan, Xinming Zhang, Liangjie Gao, Xiaobo Wang, Weijie Fu   +5 more
doaj   +1 more source

Path Tracking Control of Agricultural Automatic Navigation Vehicles Based on an Improved Sparrow Search-Pure Pursuit Algorithm

Agriculture
A pure pursuit method based on an improved sparrow search algorithm is proposed to address low path-tracking accuracy of intelligent agricultural machinery in complex farmland environments.
Junhao Wen, Liwen Yao, Jiawei Zhou, Zidong Yang, Lijun Xu, Lijian Yao   +5 more
doaj   +1 more source

Agricultural Machinery Path Tracking with Varying Curvatures Based on an Improved Pure-Pursuit Method

Agriculture
The current research on path tracking primarily focuses on improving control algorithms, such as adaptive and predictive models, to enhance tracking accuracy and stability.
Jiawei Zhou, Junhao Wen, Liwen Yao, Zidong Yang, Lijun Xu, Lijian Yao   +5 more
doaj   +1 more source

Optimal Path Tracking Control of Autonomous Vehicle: Adaptive Full-State Linear Quadratic Gaussian (LQG) Control

IEEE Access, 2019
In practice, many autonomous vehicle developers put a tremendous amount of time and efforts in tuning and calibrating the path tracking controllers in order to achieve robust tracking performance and smooth steering actions over a wide range of vehicle ...
Kibeom Lee, Seungmin Jeon, Heegwon Kim, Dongsuk Kum   +3 more
doaj   +1 more source

MKtree: generation and simulations [PDF]

, 2002
The problem to represent very complex systems has been studied by several authors, obtaining solutions based on different data structures. In this paper, a K dimensional tree (Multirresolution Kdtree, MKtree) is introduced.
Brunet Crosa, Pere, Franquesa Niubó, Marta   +1 more
core   +1 more source

Optimization of the Pure Pursuit algorithm based on real-time error

Alexandria Engineering Journal
To address the issues of vehicle overshoot on high-curvature paths (with a curvature radius less than 15 m) and the poor tracking performance on continuous turning paths in the traditional Pure Pursuit (PP) algorithm, this paper proposes an optimized ...
Fengyun Cao, Dengtao Wu, Yuxin Wu
doaj   +1 more source