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ANN-based Tilt Angle Prediction for Improved UAV Autonomous Flight |
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Saewoong Min, Minjae Kang, Eunji Kim, Chulwoo Rhim(KAIST, Korea) |
| This study aims to develop an ANN-based model to predict the tilt angle of UAVs considering wind speed. Safe and efficient operation of self-driving UAVs is crucial for various applications. The proposed model achieves high prediction accuracy (R2 values of 0.8592, 0.8722, and 0.9678) by using data from current and past states to predict future states and ensure stable UAV control. Integrating additional data sources like gyro sensors, temperature, barometric pressure, and images could further enhance tilt angle predictions and self-flying control accuracy. The model has potential for diverse UAV applications and aids decision-making in autonomous flight. |
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CUSUM (Cumulative Sum) Based High-Vacuum Data Drift Detection Reduces XPS Equipment Maintenance Time |
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Suhyoung Ha(Sungkyunkwan University, Samsung Electronics, Korea), JaeWook Jeon(Sungkyunkwan University, Korea) |
| In semiconductor manufacturing processes, maintaining an ultra-high vacuum environment is crucial for stable operation of X-ray source used in XPS (X-ray Photoelectron Spectroscopy) measurements.
This paper proposes a method to proactively prevent malfunctions by employing the CUSUM (Cumulative Sum) algorithm. By leveraging data analysis techniques, our method enhances the effectiveness of equipment maintenance, facilitating timely interventions and minimizing the risk of unplanned downtime.
This improves overall process efficiency and productivity and leads to economic benefits. |
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Practical stability of a class of switched nonlinear positive systems |
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Yue Dong, Yazhou Tian(University of Jinan, China) |
| The practical stability problem of a type of switched nonlinear positive systems (SNPSs) with external disturbance under average dwell time (ADT) switching signal is addressed in this thesis. The adequate conditions for the practical stability of each solution of the system are obtained. In contrast to other papers, external disturbance which is bounded is taken into account in this paper and the result incorporates the previous conclusions. Moreover, compared to other papers the nonlinear functions are restricted to a sector field. Eventually, a numerical instance is adduced to prove the validity of the conclusion. |
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Analysis of the effect of the passive speed booster for a higher actuation speed |
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Jin-Gyu Lee(Sungkyunkwan University, Korea), Hugo Rodrigue(Sungkyunkwan university, Korea) |
| In this paper, the passive speed booster for faster vacuum-based bellow actuators is introduced. Although vacuum-based actuators can generate large forces by scaling their dimensions, the actuation speed of those actuators is generally slow as they cannot utilize large pressure differences and undergo large volume changes. The analytical model and experiment results show that the passive speed booster can enhance the actuation speed, especially when the payload is heavy, which indicates that this new element can be useful when the actuator is under intense workload. |
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A Reference Shaping Filter Design Method for Discrete-Time Sliding Mode Control With Decoupled Disturbance Compensator to Inhibit Overshoot |
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Dae-young Yang, Tae-Ho Oh, Young-Seok Kim(Seoul National University, Korea), Sang-Hoon Lee(RS Automation, Korea), Dong-Il Dan Cho(Seoul National University, Korea) |
| The discrete-time sliding mode control (DSMC) is a highly utilized method in industrial systems. The DSMC with decoupled disturbance compensator (DDC) method is one of the robust control methods with high tracking performance and fast responses. However, the input reference to the output transfer function of the DSMC has a transfer function zero, causing an unwanted overshoot and degrading the performance of the controller. Thus, this overshoot characteristic can be problematic in some systems that have stringent no-overshoot specifications. In this paper, a reference shaping filter design method is proposed that inhibits any overshoot in the response of the DSMC with DDC. |
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A new methods for periodic coupled operator equations under submatrix constraints |
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Wenling Wang, Caiqin Song(University of Jinan, China) |
| In the present work, a new iterative algorithm (CGLS) is proposed to solve the constraint solutions of period-coupled operator equations. The constraint solution here we are dealing with is the Hamiltonian solution. When the equations of the studied period-coupled operators are consistent, it is proved that for given any initial complex matrices, the constrained solutions can converge to exact solutions. Otherwise, when the studied period-coupled operators are inconsistent, the minimum norm constraint solutions can also be calculated by selecting any initial matrices. Finally, some numerical examples are given to illustrate the effectiveness and superiority of the new methods. |
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