24 research outputs found
Balanced Order Batching with Task-Oriented Graph Clustering
Balanced order batching problem (BOBP) arises from the process of warehouse
picking in Cainiao, the largest logistics platform in China. Batching orders
together in the picking process to form a single picking route, reduces travel
distance. The reason for its importance is that order picking is a labor
intensive process and, by using good batching methods, substantial savings can
be obtained. The BOBP is a NP-hard combinational optimization problem and
designing a good problem-specific heuristic under the quasi-real-time system
response requirement is non-trivial. In this paper, rather than designing
heuristics, we propose an end-to-end learning and optimization framework named
Balanced Task-orientated Graph Clustering Network (BTOGCN) to solve the BOBP by
reducing it to balanced graph clustering optimization problem. In BTOGCN, a
task-oriented estimator network is introduced to guide the type-aware
heterogeneous graph clustering networks to find a better clustering result
related to the BOBP objective. Through comprehensive experiments on
single-graph and multi-graphs, we show: 1) our balanced task-oriented graph
clustering network can directly utilize the guidance of target signal and
outperforms the two-stage deep embedding and deep clustering method; 2) our
method obtains an average 4.57m and 0.13m picking distance ("m" is the
abbreviation of the meter (the SI base unit of length)) reduction than the
expert-designed algorithm on single and multi-graph set and has a good
generalization ability to apply in practical scenario.Comment: 10 pages, 6 figure
CapsuleBot: A Novel Compact Hybrid Aerial-Ground Robot with Two Actuated-wheel-rotors
This paper presents the design, modeling, and experimental validation of
CapsuleBot, a compact hybrid aerial-ground vehicle designed for long-term
covert reconnaissance. CapsuleBot combines the manoeuvrability of bicopter in
the air with the energy efficiency and noise reduction of ground vehicles on
the ground. To accomplish this, a structure named actuated-wheel-rotor has been
designed, utilizing a sole motor for both the unilateral rotor tilting in the
bicopter configuration and the wheel movement in ground mode. CapsuleBot comes
equipped with two of these structures, enabling it to attain hybrid
aerial-ground propulsion with just four motors. Importantly, the decoupling of
motion modes is achieved without the need for additional drivers, enhancing the
versatility and robustness of the system. Furthermore, we have designed the
full dynamics and control for aerial and ground locomotion based on the
bicopter model and the two-wheeled self-balancing vehicle model. The
performance of CapsuleBot has been validated through experiments. The results
demonstrate that CapsuleBot produces 40.53% less noise in ground mode and
consumes 99.35% less energy, highlighting its potential for long-term covert
reconnaissance applications.Comment: 7 pages, 10 figures, submitted to 2024 IEEE International Conference
on Robotics and Automation (ICRA). This work has been submitted to the IEEE
for possible publication. Copyright may be transferred without notice, after
which this version may no longer be accessibl
Build and control a novel hybrid flying-moving robot
In this dissertation, the dynamic model and control of DoubleBee, a novel hybrid flying-moving vehicle consisting of two propellers mounted on tilting servo motors and two motor-driven wheels, are presented. DoubleBee exploits the high energy efficiency of a bicopter configuration in aerial mode, and enjoys the low power consumption of a two-wheel self-balancing robot on the ground. Furthermore, the propeller thrusts act as additional control inputs on the ground, enabling a novel decoupled control scheme where the attitude of the robot is controlled using thrusts and the translational motion is realized using wheels. A prototype of DoubleBee is constructed using commercially available components. The power efficiency and the control performance of the robot are verified through comprehensive experiments. Challenging tasks in indoor and outdoor environments demonstrate the capability of DoubleBee to traverse unstructured environments, fly over and move under barriers, and climb steep and rough terrains.Master of Science (Computer Control and Automation
Method of Association Rules Mining and Its Application in Analysis of Seawater Samples
This paper aims to set up new rules for processing seawater quality monitoring data collected by photoelectric sensor network, and mine out the useful information contained in the data. For this purpose, the immune algorithm was introduced to the classical genetic algorithm, the fitness function was designed, and the crossover and mutation probabilities were adjusted, thus creating the adaptive immune genetic algorithm (IIGA). The new algorithm was described in details and applied in an actual case. Through the comparison between the IIGA, IGA and apriori algorithms, the author concluded that the IIGA not only shortened the mining time, but also ensured the operation accuracy. The research findings are of great importance to the association rules mining in various fields.</span