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🔍 omar ramirez 📂 Engineering 📄 Preprint
Showing 50 results for "omar ramirez" in Engineering · Preprint
Engineering Preprint PDF DOI

Topology Estimation for Open Multi-Agent Systems

Nana Wang, Pelin Sekercioglu, Dimos V. Dimarogonas · 2026

We address the problem of interaction topology identification in open multi-agent systems (OMAS) with dynamic node sets and fast switching interactions. In such systems, new agents join and interactio…

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Engineering Preprint PDF DOI

Audio-Cogito: Towards Deep Audio Reasoning in Large Audio Language Models

Longhao Li, Hongjie Chen, Zehan Li, Qihan Hu, Jian Kang, Jie Li, Lei Xie, Yongxiang Li · 2026

Recent advances in reasoning models have driven significant progress in text and multimodal domains, yet audio reasoning remains relatively limited. Only a few Large Audio Language Models (LALMs) inco…

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Engineering Preprint PDF DOI

Single-Waveguide Multiple-Pinching-Antenna Systems: OMA versus NOMA

Yanyu Cheng, Hao Li, Zhen Wang, Zhiguo Ding · 2026

This paper investigates the performance of a pinching-antenna (PA) system with a signal waveguide and multiple pinching antennas to serve users distributed across multiple rooms. The performance of th…

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Engineering Preprint PDF DOI

MGMAR: Metal-Guided Metal Artifact Reduction for X-ray Computed Tomography

Hyoung Suk Park, Kiwan Jeon · 2026

An X-ray computed tomography (CT), metal artifact reduction (MAR) remains a major challenge because metallic implants violate standard CT forward-model assumptions, producing severe streaking and shad…

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Engineering Preprint PDF DOI

Stability of Open Multi-agent Systems over Dynamic Signed Digraphs

Pelin Sekercioglu, Angela Fontan, Dimos V. Dimarogonas · 2026

We address the synchronization problem in open multi-agent systems (OMAS) containing both cooperative and antagonistic interactions. In these systems, agents can join or leave the network over time, a…

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Engineering Preprint PDF DOI

Fast Multirate Encoding for 360{\deg} Video in OMAF Streaming Workflows

Amritha Premkumar, Christian Herglotz · 2026

Preparing high-quality 360-degree video for HTTP Adaptive Streaming requires encoding each sequence into multiple representations spanning different resolutions and quantization parameters (QPs). For …

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Engineering Preprint PDF DOI

Consensus tracking of perturbed open multi-agent systems with repelling antagonistic interactions

Mengqi Xue, Yuchao Xiong, Yue Song · 2025

An open multi-agent system (OMAS) comprises migrating agents which produce a flexible network structure that is naturally switching and size-varying. Meanwhile, agent migrations also make an OMAS more…

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Engineering Preprint PDF DOI

Wind Speed Weibull Model Identification in Oman, and Computed Normalized Annual Energy Production (NAEP) From Wind Turbines Based on Data From Weather Stations

Osama A. Marzouk · 2025

Using observation records of wind speeds from weather stations in the Sultanate of Oman between 2000 and 2023, we compute estimators of the two Weibull distribution parameters (namely, the Weibull dis…

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Engineering Preprint PDF DOI

Chlorophyll-a Mapping and Prediction in the Mar Menor Lagoon Using C2RCC-Processed Sentinel 2 Imagery

Antonio Martinez-Ibarra, Aurora Gonzalez-Vidal, Adrian Canovas-Rodriguez, Antonio F. Skarmeta · 2025

The Mar Menor, Europe's largest hypersaline coastal lagoon, located in southeastern Spain, has undergone severe eutrophication crises, with devastating impacts on biodiversity and water quality. Monit…

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Engineering Preprint PDF DOI

AQA-TTRL: Self-Adaptation in Audio Question Answering with Test-Time Reinforcement Learning

Haoyu Zhang, Jiaxian Guo, Yusuke Iwasawa, Yutaka Matsuo · 2025

Large Audio Language Models (LALMs) demonstrate impressive general audio understanding, but once deployed, they are static and fail to improve with new real-world audio data. As traditional supervised…

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Engineering Preprint PDF DOI

Measuring Audio's Impact on Correctness: Audio-Contribution-Aware Post-Training of Large Audio Language Models

Haolin He, Xingjian Du, Renhe Sun, Zheqi Dai, Yujia Xiao, Mingru Yang, Jiayi Zhou, Xiquan Li, Zhengxi Liu, Zining Liang, Chunyat Wu, Qianhua He, Tan Lee, Xie Chen, Wei-Long Zheng, Weiqiang Wang, Mark Plumbley, Jian Liu, Qiuqiang Kong · 2025

Large Audio Language Models (LALMs) represent an important frontier in multimodal AI, addressing diverse audio tasks. Recently, post-training of LALMs has received increasing attention due to signific…

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Engineering Preprint PDF DOI

Multi-cluster distributed optimization in open multi-agent systems over directed graphs with acknowledgement messages

Evagoras Makridis, Gabriele Oliva, Themistoklis Charalambous · 2025

In this paper, we tackle the problem of distributed optimization over directed networks in open multi-agent systems (OMAS), where agents may dynamically join or leave, causing persistent changes in ne…

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Engineering Preprint PDF DOI

Analysis of Transferability Estimation Metrics for Surgical Phase Recognition

Prabhant Singh, Yiping Li, Yasmina Al Khalil · 2025

Fine-tuning pre-trained models has become a cornerstone of modern machine learning, allowing practitioners to achieve high performance with limited labeled data. In surgical video analysis, where expe…

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Engineering Preprint PDF DOI

VMRA-MaR: An Asymmetry-Aware Temporal Framework for Longitudinal Breast Cancer Risk Prediction

Zijun Sun, Solveig Thrun, Michael Kampffmeyer · 2025

Breast cancer remains a leading cause of mortality worldwide and is typically detected via screening programs where healthy people are invited in regular intervals. Automated risk prediction approache…

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Engineering Preprint PDF DOI

Pinching-Antenna Systems (PASS) Meet Multiple Access: NOMA or OMA?

Qiao Ren, Xidong Mu, Siyu Lin, Yuanwei Liu · 2025

A fundamental two-user PASS-based communication system is considered under three MA schemes, namely non-orthogonal multiple access (NOMA), frequency division multiple access (FDMA), and time division …

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Engineering Preprint PDF DOI

Omni-R1: Do You Really Need Audio to Fine-Tune Your Audio LLM?

Andrew Rouditchenko, Saurabhchand Bhati, Edson Araujo, Samuel Thomas, Hilde Kuehne, Rogerio Feris, James Glass · 2025

We propose Omni-R1 which fine-tunes a recent multi-modal LLM, Qwen2.5-Omni, on an audio question answering dataset with the reinforcement learning method GRPO. This leads to new State-of-the-Art perfo…

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Engineering Preprint PDF DOI

Proposed 2MW Wind Turbine for Use in the Governorate of Dhofar at the Sultanate of Oman

Osama Ahmed Marzouk, Omar Rashid Hamdan Al Badi, Maadh Hamed Salman Al Rashdi, Hamed Mohammed Eid Al Balushi · 2025

In this work, we propose a preliminary design of a horizontal-axis wind turbine (HAWT) as a candidate for the Dhofar Wind Farm project, in the southern Omani Governorate "Dhofar", at the southwest par…

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Engineering Preprint PDF DOI

BMAR: Barometric and Motion-based Alignment and Refinement for Offline Signal Synchronization across Devices

Manuel Meier, Christian Holz · 2025

A requirement of cross-modal signal processing is accurate signal alignment. Though simple on a single device, accurate signal synchronization becomes challenging as soon as multiple devices are invol…

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Engineering Preprint PDF DOI

MAR-DTN: Metal Artifact Reduction using Domain Transformation Network for Radiotherapy Planning

Belen Serrano-Anton, Mubashara Rehman, Niki Martinel, Michele Avanzo, Riccardo Spizzo, Giuseppe Fanetti, Alberto P. Munuzuri, Christian Micheloni · 2024

For the planning of radiotherapy treatments for head and neck cancers, Computed Tomography (CT) scans of the patients are typically employed. However, in patients with head and neck cancer, the qualit…

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Engineering Preprint PDF DOI

Average Consensus over Directed Networks in Open Multi-Agent Systems with Acknowledgement Feedback

Evagoras Makridis, Andreas Grammenos, Gabriele Oliva, Evangelia Kalyvianaki, Christoforos N. Hadjicostis, Themistoklis Charalambous · 2024

In this paper, we address the distributed average consensus problem over directed networks in open multi-agent systems (OMAS), where the stability of the network is disrupted by frequent agent arrival…

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