Simon Wong

Hong Kong University of Science and Technology | UST

BLE beacon networks are widely adopted for IoT and smart city applications, but they are susceptible to security threats, including piggybacking and spoofing attacks. These attacks can infringe on or even jeopardize the profitability of network owners. To address this issue, BLE beacon packets are often encrypted or updated periodically, which requ...

To address the short-lived battery lifetime of Bluetooth low energy (BLE) beacons, researchers proposed solar-powered designs, equipped with rechargeable energy storage such as a supercapacitor. However, accurately monitoring the energy status - an essential step for device maintenance - has shown to be a major concern. Existing energy status monit...

Greenhouse farming is a trending practice to secure food production in desert environments. Such a practice often requires sensing systems to monitor the greenhouse microclimate. However, traditional monitoring systems are often limited by their feature size, energy consumption, and maintenance cost. To address these issues, this article introduces...

Twitter is a social media platform bridging most countries and allows real-time news discovery. Since the tweets on Twitter are usually short and express public feelings, thus provide a source for opinion mining and sentiment analysis for global events. This paper proposed an effective solution, in providing a sentiment on tweets related to the FIF...

Sentiment analysis is a well-known natural language processing task that involves identifying the emotional tone or polarity of a given piece of text. With the growth of social media and other online platforms, sentiment analysis has become increasingly crucial for businesses and organizations seeking to monitor and comprehend customer feedback as...

With growing demands for IoT applications, BLE beacon networks are rapidly being adopted. Periodic battery replacement operations and onsite maintenance are required to ensure continuous and reliable service. These operations are labour-intensive and resource-exhaustive. Therefore, Bluetooth gateways/mobile devices are often employed to monitor/col...

Contact tracing with mobile applications is an attractive approach for many governments and industry initiatives to address the Covid-19 pandemic. However, many approaches today have severe privacy and security issues, and many of them also fail to offer a sustainable contact tracing infrastructure due to the demanding energy consumption. This work...

Contact tracing is the techno-choice of reference to address the COVID-19 pandemic. Many of the current approaches have severe privacy and security issues and fail to offer a sustainable contact tracing infrastructure. We address these issues introducing an innovative, privacy-preserving, sustainable, and experimentally tested architecture that lev...

One key feature of Bluetooth low energy (BLE) beacons is the received signal strength, which can be used to estimate the distance between any Bluetooth-compatible receiver (e.g., smartphone, tablet, etc.) and fixed deployed beacon. Although received signal strength (RSS) can be measured easily with commonly available smart devices, the measurements...

Bluetooth Low Energy (BLE) beacon networks are a popular infrastructure for IoT and smart city applications due to their scalability and affordability, as well as the proliferation of Bluetooth-enabled devices. However, BLE beacon networks suffer from short battery lifetime, inducing additional maintenance costs. Previous works have tackled this pr...