17 APR 2025
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۲۹-۲۸ فروردین ۱۴۰۴ (۱۷-۱۸ آوریل ۲۰۲۵)

17 APR 2025
14:00 - 16:00

We address Krasner's problem (1956) for Polish ultrametric spaces and provide a (hopefully) satisfactory solution. In particular, we discuss a correspondence between the isometry groups of Polish ultrametric spaces belonging to some natural subclasses and various collections of generalized wreath products proposed in the literature. This is joint work with R. Camerlo and A. Marcone.

Zoom room information:
https://us06web.zoom.us/j/81916335336?pwd=5zQT4lutMiBoY5Xp1pkFGtbqiaGozg.1
Meeting ID: 819 1633 5336
Passcode: 559618
Venue: Niavaran, Lecture Hall 1

16 APR 2025
14:00 - 15:00

In this work, we present two machine learning-based approaches for predicting drug-disease and drug-target interactions, with a strong emphasis on the role of meaningful feature selection. While deep learning models have shown great potential in biomedical domains, their complexity often comes at the cost of interpretability a crucial factor in clinical and pharmacological applications. Our research demonstrates that when biologically relevant and informative features are carefully engineered, classical machine learning models can achieve competitive performance while offering greater transparency. By leveraging domain knowledge to extract features such as molecular fingerprints, gene expression profiles, and structural similarities, we were able to construct models that are not only efficient but also interpretable and easier to validate by domain experts. The results highlight that thoughtful feature design can significantly influence model selection, performance, and trustworthiness, paving the way for more responsible and explainable AI solutions in drug discovery and repositioning.

This Seminar is free, hybrid, and open to the public.

16 APR 2025
09:00 - 16:00

Perceptual decision making: A neurobiological introduction - Workshop

16 APR 2025
18:00 - 19:30

Date and time,


6-7:30pm, Wednesday 27 Farvardin 1404 (16 April 2025).


Venue: Online



Link

https://www.skyroom.online/ch/schoolofphysics/colloquium



Abstract


The purpose of this survey is to take a snapshot of the attitudes of physicists working on some of the most pressing questions in modern physics, which may be useful to sociologists and historians of science. For this study, a total of 85 completed surveys were returned out of 151 registered participants of the ``Black holes Inside and out'' conference, held in Copenhagen in 2024. The survey asked questions about some of the most contentious issues in fundamental physics, including the nature of black holes and dark energy. A number of surprising results were found. For example, some of the leading frameworks, such as the cosmological constant, cosmic inflation, or string theory - while most popular - gain less than the majority of votes from the participants. The only statement that gains majority approval (by 68% of participants) was that the Big Bang meant “the universe evolved from a hot dense state”, not “an absolute beginning time”. These results provide reasons for caution in describing ideas as consensus in the scientific community when a more nuanced view may be justified.

16 APR 2025
14:00 - 15:00

Digital signature schemes play a vital role in ensuring secure communication, authentication, and data integrity across numerous applications, including secure email, financial transactions, and blockchain systems. However, classical schemes like RSA and ECDSA are vulnerable to quantum attacks, prompting a global shift toward post-quantum cryptographic alternatives. As part of this transition, NIST has already standardized three post-quantum cryptographic schemes: (i) ML-KEM (FIPS 203) for key encapsulation, based on CRYSTALS-Kyber; (ii) ML-DSA (FIPS 204) for digital signatures, derived from CRYSTALS-Dilithium; and (iii) SLH-DSA (FIPS 205), a stateless hash-based signature scheme based on $ m SPHINCS^+$. Hash-based digital signature schemes are particularly important because their security is based on the properties of cryptographic hash functions, rather than number-theoretic problems, offering a more robust foundation for post-quantum security.
An important type of digital signature schemes is Group Signature Schemes which enable members of a group to sign messages anonymously on behalf of the group while a designated authority is able to reveal the signer?s identity when necessary hence it ensures accountability. Such functionality is critical in privacy-preserving applications like direct anonymous attestations and reputation systems. Fully dynamic GSSs are especially valuable as they allow users to join or be revoked without requiring system-wide updates?an essential property for real-world scenarios.
In this talk, after introducing digital signatures and their everyday applications, I will review several hash-based group signature scheme proposals, including G-Merkle, DGM, DGMT, and SPHINX-in-the-Head, highlighting their limitations in terms of scalability and efficiency. I will then present DGSP, our newly proposed scalable and efficient fully dynamic group signature scheme, and compare it with existing post-quantum alternatives to demonstrate its advantages.
Zoom room information:
https://us06web.zoom.us/j/84906984159?pwd=BCWaIbXBuku3A5I84zNg9mHFxVZjXD.1
Meeting ID: 849 0698 4159
Passcode: 362880
Venue: Niavaran, Lecture Hall 1

16 APR 2025
17:30 - 19:00


Venue: Online

16 APR 2025
12:30 - 13:30

Abstract:

The Nobel Prize in Physics 2024 was awarded jointly to John J. Hopfield and Geoffrey Hinton "for foundational discoveries and inventions that enable machine learning with artificial neural networks".

Poster:
https://particles.ipm.ir/docs/poster-DrRouhani.pdf

Indico Link:
https://indico.hep.ipm.ir/e/sh.rouhani

Meeting Place:
Seminar Room, School of Particles and Accelerators, IPM

Link to Join Virtually:
https://www.skyroom.online/ch/ipm-particles/special-seminar