Tootfinder

MRGSEM-Sum: An Unsupervised Multi-document Summarization Framework based on Multi-Relational Graphs and Structural Entropy Minimization
Yongbing Zhang, Fang Nan, Shengxiang Gao, Yuxin Huang, Kaiwen Tan, Zhengtao Yu
https://arxiv.org/abs/2507.23400

MRGSEM-Sum: An Unsupervised Multi-document Summarization Framework based on Multi-Relational Graphs and Structural Entropy Minimization
The core challenge faced by multi-document summarization is the complexity of relationships among documents and the presence of information redundancy. Graph clustering is an effective paradigm for addressing this issue, as it models the complex relationships among documents using graph structures and reduces information redundancy through clustering, achieving significant research progress. However, existing methods often only consider single-relational graphs and require a predefined number o…

End-to-End Large Portfolio Optimization for Variance Minimization with Neural Networks through Covariance Cleaning
Christian Bongiorno, Efstratios Manolakis, Rosario Nunzio Mantegna
https://arxiv.org/abs/2507.01918

End-to-End Large Portfolio Optimization for Variance Minimization with Neural Networks through Covariance Cleaning
We develop a rotation-invariant neural network that provides the global minimum-variance portfolio by jointly learning how to lag-transform historical returns and how to regularise both the eigenvalues and the marginal volatilities of large equity covariance matrices. This explicit mathematical mapping offers clear interpretability of each module's role, so the model cannot be regarded as a pure black-box. The architecture mirrors the analytical form of the global minimum-variance solution yet …

When are exact categories co-exact?
James Richard Andrew Gray
https://arxiv.org/abs/2506.23413 https://arxiv.org/pdf/2506.23413

When are exact categories co-exact?
We show that opposite category of a cocomplete pretopos is ideally exact and arithmetical. We do this by showing that there are conditions common to additive and lextensive categories which, in the exact context, imply that: pushouts of monomorphisms along arbitrary morphisms exist and are pullbacks; monomorphisms are stable under pushout; co-reflexive-relations are co-effective-equivalence-relations; and coprotomodularity holds.

Tactile-Guided Robotic Ultrasound: Mapping Preplanned Scan Paths for Intercostal Imaging
Yifan Zhang, Dianye Huang, Nassir Navab, Zhongliang Jiang
https://arxiv.org/abs/2507.20282

Tactile-Guided Robotic Ultrasound: Mapping Preplanned Scan Paths for Intercostal Imaging
Medical ultrasound (US) imaging is widely used in clinical examinations due to its portability, real-time capability, and radiation-free nature. To address inter- and intra-operator variability, robotic ultrasound systems have gained increasing attention. However, their application in challenging intercostal imaging remains limited due to the lack of an effective scan path generation method within the constrained acoustic window. To overcome this challenge, we explore the potential of tactile c…

On the efficiency roll-off in Perovskite Light Emitting Diodes
Pradeep R Nair, Advaith Kiran Marathi
https://arxiv.org/abs/2507.22741 https://arxiv.org/pdf…

On the efficiency roll-off in Perovskite Light Emitting Diodes
Here, we report a comprehensive modeling framework to unravel the efficiency roll-off in Perovskite light emitting diodes (PeLEDs). Our model self-consistently accounts for a positive feedback mechanism which involves diverse phenomena like temperature-dependent carrier recombination, space charge effects, Joule heating, and thermal transport. Model predictions compare well with experimental results such as dark current-voltage characteristics and efficiency as well as radiance roll-off under h…

ProMemAssist: Exploring Timely Proactive Assistance Through Working Memory Modeling in Multi-Modal Wearable Devices
Kevin Pu, Ting Zhang, Naveen Sendhilnathan, Sebastian Freitag, Raj Sodhi, Tanya Jonker
https://arxiv.org/abs/2507.21378

ProMemAssist: Exploring Timely Proactive Assistance Through Working Memory Modeling in Multi-Modal Wearable Devices
Wearable AI systems aim to provide timely assistance in daily life, but existing approaches often rely on user initiation or predefined task knowledge, neglecting users' current mental states. We introduce ProMemAssist, a smart glasses system that models a user's working memory (WM) in real-time using multi-modal sensor signals. Grounded in cognitive theories of WM, our system represents perceived information as memory items and episodes with encoding mechanisms, such as displacement and interf…

Bridging the gap: consistent modeling of protoplanetary disk heating and gap formation by planet-induced spiral shocks
Satoshi Okuzumi, Takayuki Muto, Ryosuke T. Tominaga, Shizu Shimizu
https://arxiv.org/abs/2507.18283

Bridging the gap: consistent modeling of protoplanetary disk heating and gap formation by planet-induced spiral shocks
A giant planet embedded in a protoplanetary disk excites spiral density waves, which steepen into shocks as they propagate away from the planet. These shocks lead to secular disk heating and gap opening, both of which can have important implications for the evolution of solids near the planet. To date, these two effects have largely been modeled independently. In this study, we present a self-consistent model that unifies these processes by linking shock heating and angular momentum deposition …

Secular Resonances in Planet-Hosting Binary Stars. II. Application to Terrestrial Planet Formation
Nader Haghighipour, Michael Andrews
https://arxiv.org/abs/2507.17098 https://

Secular Resonances in Planet-Hosting Binary Stars. II. Application to Terrestrial Planet Formation
Continuing our study of the effects of secular resonances on the formation of terrestrial planets in moderately close binary stars, we present here the results of an extensive numerical simulations of the formation of these objects. Considering a binary with two giant planets and a protoplanetary disk around its primary star, we have simulated the late stage of terrestrial planet formation for different types of the secondary, and different orbital elements of the binary and giant planets. Resu…

Terrestrial Planet Formation from Two Source Reservoirs
David Nesvorny, Alessandro Morbidelli, William F. Bottke, Rogerio Deienno, Max Goldberg
https://arxiv.org/abs/2507.14814

Terrestrial Planet Formation from Two Source Reservoirs
This work describes new dynamical simulations of terrestrial planet formation. The simulations started at the protoplanetary disk stage, when planetesimals formed and accreted into protoplanets, and continued past the late stage of giant impacts. We explored the effect of different parameters, such as the initial radial distribution of planetesimals and Type-I migration of protoplanets, on the final results. In each case, a thousand simulations were completed to characterize the stochastic natu…

Planet formation in chemically diverse and evolving discs -- I. Composition of planetary building blocks
E. Pacetti, E. Schisano, D. Turrini, C. P. Dullemond, S. Molinari, C. Walsh, S. Fonte, U. Lebreuilly, R. S. Klessen, P. Hennebelle, S. L. Ivanovski, R. Politi, D. Polychroni, P. Simonetti, L. Testi
https://arxiv.org/abs/2506.…

Planet formation in chemically diverse and evolving discs -- I. Composition of planetary building blocks
Protoplanetary discs are dynamic environments where the interplay between chemical processes and mass transport shapes the composition of gas and dust available for planet formation. We investigate the combined effects of volatile chemistry - including both gas-phase and surface reactions - viscous gas evolution, and radial dust drift on the composition of planetary building blocks. We explore scenarios of chemical inheritance and reset under varying ionisation conditions and for various dust g…