Publications

In the evolving landscape of the Internet of Things (IoT), Mobile Wireless Sensor Networks (MWSN) play a pivotal role, particularly in dynamic environments requiring mobile sensing capabilities. A primary challenge in MWSNs is achieving accurate node positioning with minimal energy consumption, as these networks often consist of battery-powered, mobile sensors where energy replenishment is difficult. This paper addresses the critical problem of energy-efficient node localization in MWSNs. We propose a novel positioning approach leveraging Cooperative Virtual Array (CVA) technology, which strategically utilizes the mobility of nodes to enhance positioning accuracy while conservatively using energy resources. The methodology revolves around optimizing the number of transceiver nodes, considering factors such as node moving speed, total energy consumption, and positioning errors. Central to our approach is the Signal Arrival and Interaction (SAI) algorithm, an innovative technique devised for efficient and precise mobile node localization, replacing traditional Time of Arrival (ToA) methods. Our simulations, conducted under various scenarios, demonstrate the significant advantages of the CVA-based positioning algorithm. Results show a marked reduction in energy consumption and robust performance in mobile node scenarios. Key findings include substantial improvements in localization accuracy and energy efficiency, highlighting the potential of our approach in enhancing the operational sustainability of MWSNs. The implications of this research are far-reaching for IoT applications, particularly those involving mobile sensors, such as in smart cities, industrial monitoring, and disaster management. By introducing a novel, energy-efficient positioning method, our work contributes to the advancement of MWSN technology, offering a sustainable solution to the challenge of mobile node localization.

Computer vision is a new approach to navigation aiding that assists visually impaired people to travel independently. A deep learning-based solution implemented on a portable device that uses a monocular camera to capture public objects could be a low-cost and handy navigation aid. By recognizing public objects in the street and estimating their distance from the user, visually impaired people are able to avoid obstacles in the outdoor environment and walk safely. In this paper, we created a dataset of public objects in an uncontrolled environment for navigation aiding. The dataset contains three classes of objects which commonly exist on pavements in the city. It was verified that the dataset was of high quality for object detection and distance estimation, and was ultimately utilized as a navigation aid solution.

Prognostics of the health degradation of lithium-ion batteries plays a crucial role in the electrification of transportation systems. Data-driven approaches have been widely adopted for battery health forecasting, but the need for labeled data and the domain-specific nature of the prediction model limit the deployment of these approaches in real-world applications. In this study, we unlock the potential of large language models as a generalized approach for lithium-ion battery state-of-health forecasting. We demonstrate the feasibility of applying large language models in a few-shot and zero-shot learning setups, where the model is capable of forecasting the battery health degradation given proper guided prompts without the need for fine-tuning. Extensive experiments are conducted to evaluate the prediction performance with various usage setups considered. The results indicate that both few-shot and zero-shot learning setups yield satisfactory performance with the lowest root-mean-square error of [Formula: see text] achieved. In addition, this research examines various future operational conditions provided in the prompt and their impact on the prediction performance. The findings of this study provide insights into the potential of large language models as a generalized approach for lithium-ion battery health prognostics.