Task scheduling algorithms are key to research and practice in parallel testing techniques, especially in control system applications. The complexity of control system testing requires higher scheduling efficiency. Ho...
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Greenhouse agriculture has emerged as a critical component in addressing global food security challenges, experiencing rapid growth and technological integration in recent years. This paper presents GreenSight, an IoT...
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ISBN:
(纸本)9798350348798;9798350348804
Greenhouse agriculture has emerged as a critical component in addressing global food security challenges, experiencing rapid growth and technological integration in recent years. This paper presents GreenSight, an IoT-based automated greenhouse monitoring system designed to optimize plant growth conditions while enhancing operational efficiency. Leveraging advanced technologies such as the NodeMCU ESP8266 microcontroller and DHT22 sensor, GreenSight facilitates real-time environmental monitoring and control within the greenhouse environment. The system incorporates actuators including SG90 servo motors, 9V DC motors, and mist atomizers to regulate atmospheric conditions tailored to diverse plant species' requirements. Additionally, a user-friendly Android application enables remote access and configuration. Ten (10) experts specializing in information technology and computer engineering assessed the prototype using ISO 9126 evaluation criteria. The Likert Scale was employed for interpretation. According to the evaluation, the project attained an overall mean of 3.32, indicating that it satisfies requirements concerning functionality, reliability, efficiency, usability, maintainability, and portability.
With the advanced development and maturing of small satellite technologies, there is a high commercial demand for low-cost small satellites with fast delivery for a multitude of applications. This paper presents a har...
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ISBN:
(纸本)9781665490320
With the advanced development and maturing of small satellite technologies, there is a high commercial demand for low-cost small satellites with fast delivery for a multitude of applications. This paper presents a hardware-in-the-loop system for testing the satellite's attitude determination and control system and the Agile framework from software engineering practices to guide resource-effective end-to-end development processes, while maintaining a comprehensive system validation. Experimental results for design verification of satellite's Attitude Determination and control Systems (ADCS) using our ongoing concurrent multiple satellite programs are presented.
Wireless sensor networks (WSNs) have a broad range of applications, and time synchronization is essential to ensure their correct operation. In this paper, a clock skew estimation scheme is presented for timestamp-fre...
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ISBN:
(纸本)9798350329285
Wireless sensor networks (WSNs) have a broad range of applications, and time synchronization is essential to ensure their correct operation. In this paper, a clock skew estimation scheme is presented for timestamp-free synchronization, which greatly simplifies computation while economizing energy consumption. Considering that no single delay model can fit all cases in WSNs, a robust estimator with low complexity based on this scheme is developed that can estimate clock skew accurately without prior statistical characteristics of delays. Simulation results demonstrate the effectiveness of the proposed scheme.
Direct Energy Deposition (DED) additive manufacturing is well suited to fabricating large thin-walled metal structures such as rocket nozzles but suffers from layer-to-layer defect propagation. Propagating defects may...
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Energy integration from diverse and variable sources is needed to improve energy access, reliability, and sustain ability, respectively. Fluctuations and seasonal variations of wind and solar energy need to be well ma...
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In this paper, a predictor-based sliding mode control law is proposed for discrete-time systems with input delays to reject unknown disturbances. First, a disturbance observer is built to estimate the unkown disturban...
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ISBN:
(纸本)9798350373707;9798350373691
In this paper, a predictor-based sliding mode control law is proposed for discrete-time systems with input delays to reject unknown disturbances. First, a disturbance observer is built to estimate the unkown disturbance signal, and the boundedness of estimation error of disturbance observer is obtained. Next, a predictor is designed to transform the system with input delay to a system without time delay, solving the delay compensation problem of discrete-time systems with input delays. Finally, a new predictor-based sliding mode control law is proposed to construct the sliding surface by using the predictors and the unknown disturbance signal. The unknown disturbance signal is estimated by the designed observer. It is noted that the sliding surface is constructed by utilizing the predictor, rather than by using system state. A numerical example is given to show the effectiveness of this predictor-based sliding mode control law.
Electric and hybrid-electric aircraft can help our society transition towards more sustainable aviation and lower greenhouse gas (GHG) emissions. This paper finds the speed that minimizes the direct operating cost (DO...
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The cost of power converters plays a crucial role in designing high-voltage off-board electric vehicle (EV) chargers. A multilevel topology, especially, dual active bridge (DAB) converter is utilized in a fast EV char...
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When energy storage is limited, energy efficiency is crucial for hybrid and electric vehicles (EVs). The induction motor's high stability, low cost, and little loss structure boost its efficiency. Furthermore, eve...
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