Explanipedia

Optimization of Smartphone-Based Strain Measurement Algorithm Utilizing Arc-Support Line Segments Open

Qiwen Cui, Chun Bao Gou, Songwu Lu, Botao Xie · 2025

Smartphone-based strain monitoring of structural components is an emerging approach to structural health monitoring. However, the existing techniques suffer from limited accuracy and poor cross-device adaptability. This study aims to optim…

Direct Reasoning Optimization: LLMs Can Reward And Refine Their Own Reasoning for Open-Ended Tasks Open

Yifei Xu, Tusher Chakraborty, Srinagesh Sharma, Leonardo Silva Nunes, Emre Kıcıman , et al. · 2025

Recent advances in Large Language Models (LLMs) have showcased impressive reasoning abilities in structured tasks like mathematics and programming, largely driven by Reinforcement Learning with Verifiable Rewards (RLVR), which uses outcome…

RLTHF: Targeted Human Feedback for LLM Alignment Open

Yifei Xu, Tusher Chakraborty, Emre Kıcıman, Bibek Aryal, E. Rodrigues , et al. · 2025

Fine-tuning large language models (LLMs) to align with user preferences is challenging due to the high cost of quality human annotations in Reinforcement Learning from Human Feedback (RLHF) and the generalizability limitations of AI Feedba…

CloudEval-YAML: A Practical Benchmark for Cloud Configuration Generation Open

Yifei Xu, Yuning Chen, Xumiao Zhang, Xianshang Lin, Pan Hu , et al. · 2023

Among the thriving ecosystem of cloud computing and the proliferation of Large Language Model (LLM)-based code generation tools, there is a lack of benchmarking for code generation in cloud-native applications. In response to this need, we…

Sign-to-911: Emergency Call Service for Sign Language Users with Assistive AR Glasses Open

Yunqi Guo, Jinghao Zhao, Boyan Ding, C. Tan, W. Ling , et al. · 2023

Sign-to-911 offers a compact mobile system solution to fast and runtime American Sign Language (ASL) and English translations. It is designated as 911 call services for ASL users with hearing disabilities upon emergencies. It enables bidir…

CA++: Enhancing Carrier Aggregation Beyond 5G Open

Qianru Li, Zhehui Zhang, Yanbing Liu, Zhaowei Tan, Chunyi Peng , et al. · 2023

Carrier aggregation (CA) is an important component technology in 5G and beyond. It aggregates multiple spectrum fragments to serve a mobile device. However, the current CA suffers under both high mobility and increased spectrum space. The …

Dependent Misconfigurations in 5G/4.5G Radio Resource Control Open

Zhehui Zhang, Yanbing Liu, Qianru Li, Zizheng Liu, Chunyi Peng , et al. · 2023

In this paper, we study an important, yet unexplored problem of configuration dependencies in 5G/4.5G radio resource control (RRC). Different from the previous studies in 3G/4G networks, 5G/4.5G allows more than one cells to serve a mobile…

SEED Open

Jinghao Zhao, Zhaowei Tan, Yifei Xu, Zhehui Zhang, Songwu Lu · 2022

Failures in 5G mobile networks are becoming the norm with the ongoing global rollout. If left unattended, they affect mobile user experiences and the proper functioning of applications. In this work, we describe SEED, which offers a novel …

Breaking Cellular IoT with Forged Data-plane Signaling: Attacks and Countermeasure Open

Zhaowei Tan, Boyan Ding, Jinghao Zhao, Yunqi Guo, Songwu Lu · 2022

We devise new attacks exploiting the unprotected data-plane signaling in cellular IoT networks (a.k.a. both NB-IoT and Cat-M). We show that, despite the deployed security mechanisms on both control-plane signaling and data-plane packet for…

On Key Reinstallation Attacks over 4G LTE Control-Plane: Feasibility and Negative Impact Open

Muhammad Taqi Raza, Yunqi Guo, Songwu Lu, Fatima M. Anwar · 2021

research-article Open Access Share on On Key Reinstallation Attacks over 4G LTE Control-Plane: Feasibility and Negative Impact Authors: Muhammad Taqi Raza The University of Arizona, United States of America The University of Arizona, Unite…

Data-plane signaling in cellular IoT Open

Zhaowei Tan, Boyan Ding, Jinghao Zhao, Yunqi Guo, Songwu Lu · 2021

In this paper, we devise new attacks exploiting the unprotected data-plane signaling in cellular IoT networks (aka both NB-IoT and Cat-M). We show that, despite the deployed security mechanisms on both control-plane signaling and data-plan…

SecureSIM Open

Jinghao Zhao, Boyan Ding, Yunqi Guo, Zhaowei Tan, Songwu Lu · 2021

The SIM/eSIM card stores critical information for a mobile user to access the 4G/5G network. In this work, we uncover three vulnerabilities of the current SIM practice. We show that the PIN-based access control may expose the in-SIM data t…

Experience Open

Yuanjie Li, Chunyi Peng, Zhehui Zhang, Zhaowei Tan, Haotian Deng , et al. · 2021

This paper reports our five-year lessons of developing and using MobileInsight, an open-source community tool to enable software-defined full-stack, runtime mobile network analytics inside our phones. We present how MobileInsight evolves f…

Resolving Policy Conflicts in Multi-Carrier Cellular Access Open

Zengwen Yuan, Qianru Li, Yuanjie Li, Songwu Lu, Chunyi Peng , et al. · 2018

Multi-carrier cellular access dynamically selects a preferred wireless carrier by leveraging the availability and diversity of multiple carrier networks at a location. It offers an alternative to the dominant single-carrier paradigm, and s…

Supporting Mobile VR in LTE Networks Open

Zhaowei Tan, Yuanjie Li, Qianru Li, Zhehui Zhang, Zhehan Li , et al. · 2018

In recent years, we have witnessed a boom in virtual reality (VR). 21 million wearable VR headsets are projected to be shipped in 2017, resulting in $4.9 billion revenue [3]. Among all the options, the mobile VR empowered by phones is most…

Supporting Mobile VR in LTE Networks Open

Zhaowei Tan, Yuanjie Li, Qianru Li, Zhehui Zhang, Zhehan Li , et al. · 2018

In recent years, we have witnessed a boom in virtual reality (VR). 21 million wearable VR headsets are projected to be shipped in 2017, resulting in $4.9 billion revenue [3]. Among all the options, the mobile VR empowered by phones is most…

Special focus on machine-type communications Open

Xiaofeng Tao, Ping Zhang, Victor C. M. Leung, Songwu Lu, Yu Chen · 2017

A First Look at Unstable Mobility Management in Cellular Networks Open

Yuanjie Li, Jiaqi Xu, Chunyi Peng, Songwu Lu · 2016

Mobility management is a prominent feature in cellular networks. In this paper, we examine the (in)stability of mobility management. We disclose that handoff may never converge in some real-world cases. We focus on persistent handoff oscil…

New Threats to SMS-Assisted Mobile Internet Services from 4G LTE Networks. Open

Guan-Hua Tu, Yuanjie Li, Chunyi Peng, Chi-Yu Li, Muhammad Taqi Raza , et al. · 2015

New Threats to SMS-Assisted Mobile Internet Services from 4G LTE: Lessons Learnt from Distributed Mobile-Initiated Attacks towards Facebook and Other Services Open

Guan-Hua Tu, Yuanjie Li, Chunyi Peng, Chi-Yu Li, Muhammad Taqi Raza , et al. · 2015

Mobile Internet is becoming the norm. With more personalized mobile devices in hand, many services choose to offer alternative, usually more convenient, approaches to authenticating and delivering the content between mobile users and servi…

iCellular: Define Your Own Cellular Network Access on Commodity Smartphones Open

Yuanjie Li, Haotian Deng, Chunyi Peng, Guan-Hua Tu, Jiayao Li , et al. · 2015

Leveraging multi-carrier access offers a promising approach to boosting access quality in mobile networks. However, our experiments show that the potential benefits are hard to fulfill due to fundamental limitations in the network-controll…

Songwu Lu YOU? Author Swipe