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Manifold-Aware Diffusion-Augmented Contrastive Learning for Noise-Robust Biosignal Representation

arXiv.org Artificial Intelligence

Learning robust representations for physiological time-series signals continues to pose a substantial challenge in developing efficient few-shot learning applications. This difficulty is largely due to the complex pathological variations in biosignals. In this context, this paper introduces a manifold-aware Diffusion-Augmented Contrastive Learning (DACL) framework, which efficiently leverages the generative structure of latent diffusion models with the discriminative power of supervised contrastive learning. The proposed framework operates within a contextualized scattering latent space derived from Scattering Transformer (ST) features. Within a contrastive learning framework, we employ a forward diffusion process in the scattering latent space as a structured manifold-aware feature augmentation technique. We assessed the proposed framework using the PhysioNet 2017 ECG benchmark dataset. The proposed method achieved a competitive AUROC of 0.9741 in the task of detecting atrial fibrillation from a single-lead ECG signal. The proposed framework achieved performance on par with relevant state-of-the-art related works. In-depth evaluation findings suggest that early-stage diffusion serves as an ideal "local manifold explorer," producing embeddings with greater precision than typical augmentation methods while preserving inference efficiency.


Real-Time Obstacle Avoidance for a Mobile Robot Using CNN-Based Sensor Fusion

arXiv.org Artificial Intelligence

Obstacle avoidance is a critical component of the navigation stack required for mobile robots to operate effectively in complex and unknown environments. In this research, three end-to-end Convolutional Neural Networks (CNNs) were trained and evaluated offline and deployed on a differential-drive mobile robot for real-time obstacle avoidance to generate low-level steering commands from synchronized color and depth images acquired by an Intel RealSense D415 RGB-D camera in diverse environments. Offline evaluation showed that the NetConEmb model achieved the best performance with a notably low MedAE of $0.58 \times 10^{-3}$ rad/s. In comparison, the lighter NetEmb architecture, which reduces the number of trainable parameters by approximately 25\% and converges faster, produced comparable results with an RMSE of $21.68 \times 10^{-3}$ rad/s, close to the $21.42 \times 10^{-3}$ rad/s obtained by NetConEmb. Real-time navigation further confirmed NetConEmb's robustness, achieving a 100\% success rate in both known and unknown environments, while NetEmb and NetGated succeeded only in navigating the known environment.


Top global arms producers' revenues surge as major wars rage: SIPRI report

Al Jazeera

Can Pakistan join the Gaza stabilisation force? Revenues from sales of weapons and military services by the 100 largest global arms-producing companies reached a record $679bn in 2024, according to new data released by the Stockholm International Peace Research Institute (SIPRI). The Gaza and Ukraine wars, as well as global and regional geopolitical tensions and ever-higher military expenditures, increased revenues generated by the companies from sales of military goods and services to customers domestic and abroad by 5.9 percent compared to the year before, the organisation said in a report published on Monday. Lockheed Martin, Northrop Grumman and General Dynamics led the pack in the US, where the combined arms revenues of arms companies in the top 100 grew by 3.8 percent in 2024 to reach $334bn, with 30 out of the 39 US companies in the ranking increasing their revenues. However, SIPRI said widespread delays and budget overruns continue to plague key projects such as the F-35 fighter jet, the Columbia and Virginia-class submarines, and the Sentinel intercontinental ballistic missile.


Polls open in Honduras presidential election marked by fraud accusations

Al Jazeera

Hondurans are heading to the polls to elect a new president in a tightly contested race that is taking place amid concerns over voter fraud in the impoverished Central American country. Polls opened on Sunday at 7am local time (13:00 GMT) for 10 hours of voting, with the first results expected late Sunday night. The elections, in which the 128 members of Congress, hundreds of mayors, and thousands of other public officials will also be chosen, are taking place in a highly polarised climate, with the three top candidates accusing each other of plotting fraud. Moncada has suggested that she will not recognise the official results. Incumbent President Xiomara Castro of the LIBRE party is limited by law to one term in office.


Russia-Ukraine war: List of key events, day 1,375

Al Jazeera

What is in the 28-point US plan for Ukraine? 'Ukraine is running out of men, money and time' Can the US get all sides to end the war? Why is Europe opposing Trump's peace plan? Here's where things stand on Sunday, November 30. A Russian drone attack killed one person and wounded 11, including a child, on the outskirts of the Ukrainian capital, Kyiv, regional Governor Mykola Kalashnyk said on Sunday.


It's time to lock in and let your winter arc begin

BBC News

It's time to lock in and let your winter arc begin Have you ever locked in? No, not finding yourself locked in a lift or a bathroom. We're talking about locking IN - the phrase you might have seen on social media or heard people saying lately. To lock in is to focus; to endure short-term pain for long-term gain - whether that be building your body or your business. Do it today - not tomorrow.


More than 70,000 killed in Gaza since Israel offensive began, Hamas-run health ministry says

BBC News

More than 70,000 Palestinians have been killed as a result of Israel's military campaign in Gaza, according to the territory's Hamas-run health ministry. The death toll has continued to rise since a ceasefire took effect on 10 October, with Israel carrying out air strikes for what it says are violations of the truce - while bodies continue to be recovered from under the rubble. Among those reportedly killed in an Israeli drone strike on Saturday were two young brothers, Fadi and Juma Abu Assi, whose family said they had been gathering firewood when they were killed. The Israel Defense Forces (IDF) told the BBC they had struck two suspects who had crossed the so-called yellow line. The line marks where the Israeli military agreed to withdraw to under a ceasefire brokered by the United States more than seven weeks ago.


Is tracking your adult children OK or should parents learn to let go?

BBC News

Is tracking your adult children OK or should parents learn to let go? Is it caring or overbearing? Many parents are turning to their phones to keep tabs on their adult children - but is this OK (if they agree to it) or is it a sign of mums and dads struggling to let go? Dad-of-two Steven Medway, 53, has his whole family set up on a tracking app and couldn't understand why it was such a divisive subject among fellow parents. He said it became particularly useful when his daughter Martha moved 100 miles away from home for university.


Russian strikes on Kyiv kill three as Ukraine envoys travel to US for talks

Al Jazeera

What is in the 28-point US plan for Ukraine? 'Ukraine is running out of men, money and time' Can the US get all sides to end the war? Why is Europe opposing Trump's peace plan? Russian drone and missile strikes in and around Ukraine's capital, Kyiv, have killed at least three people and wounded dozens of others, officials said, as Ukrainian representatives travelled to the United States for talks on a renewed push to end the war. "Russia shot dozens of cruise and ballistic missiles and over 500 drones at ordinary homes, the energy grid, and critical infrastructure," Foreign Minister Andrii Sybiha wrote on X on Saturday.


Budget 2025: What's the best and worst that could happen for Labour?

BBC News

Budget 2025: What's the best and worst that could happen for Labour? Any big red box moment is risky. Now the chancellor's big choices are out there, what's the best-case scenario for Reeves and Starmer, and what's the worst that could happen next? On the positive side of the ledger, Labour MPs have gone off to their constituencies in a better mood this week. That is in large part down to the chancellor's decision to scrap the limit on bigger families getting some extra benefits.