Korea Advanced Institute of Science and Technology

The structural origin of irreversible transitions in biological networks

Cellular processes often exhibit irreversible state transitions even after external signals responsible for a transition are withdrawn. Long-standing questions remain: Where does such irreversibility originate from and can it be reversed? Although positive-feedback circuits among...

On the Order of Intersecting Hypergraphs

Abstract. Determining the maximum number of edges in an intersecting hypergraph on a fixed ground set under additional constraints is one of the central topics in extremal combinatorics. In contrast, there are few results on analogous problems concerning the maximum order of such...

Polar-Twisted Electron-Transport Layer Simultaneously Breaks Efficiency-Flexibility-Cost Limits in Organic Solar Cells

Abstract Perylene diimide (PDI)-based electron-transport layers (ETLs) are fundamental in governing charge extraction, interfacial recombination, and the operational longevity of organic solar cells (OSCs), yet their molecular design still lacks transferable principles. Here we p...

Meniscus‐Guided Soft‐Lithographic Assembly of Grid‐Type Molecular Martensite Films for Single‐Crystal‐Like Actuation

ABSTRACT Dynamic molecular martensites exhibit large, reversible deformations and high force densities. However, device integration has been limited by the brittleness and poor formability of single crystals. Here, we report a thin‐film route that translates molecular cooperativi...

Three-DimensionalVisualization of Conductive Filamentsin TiO2 via Conductive Atomic Force Microscopy Tomography

Abstract Direct three-dimensional visualization of conductive filaments (CFs) in valence change memory is essential for resolving whether their spatial evolution is governed by stochastic defect generation or by electrode geometry. Here, we apply conductive atomic force microscop...

Data-driven personalization of just-in-time adaptive mental health intervention via two-stage reinforcement learning approach

Most digital mental health interventions still deliver uniform content, without accounting for how a user’s fluctuating psychological state interacts with their stable individual characteristics. We propose a two-stage offline reinforcement learning (RL) framework, trained on dat...

Diffusion-weighted chemical exchange saturation transfer MRI in the human brain at 7T

Metabolite diffusion provides information on unique intracellular environments that are not captured by water diffusion. Conventional diffusion-weighted magnetic resonance spectroscopy (DW-MRS) is a useful tool for probing metabolite diffusion, but lacks spatial information. In t...

Chirality-Matched Cyclopropenimine–Thiourea Organocatalysis for Regiocontrolled Ring-Opening Polymerization of Methyl Glycolide

Abstract Poly(lactic-co-glycolic acid) (PLGA) is widely used in biomedical applications owing to its high biodegradability and biocompatibility. Although the ring-opening polymerization (ROP) of methyl glycolide (MeG) offers a route to synthesizing alternating PLGA, the comparabl...

Hierarchical DefectEngineering for Spectral PhononControl in Monolayer MoS2

Abstract Two-dimensional (2D) transition-metal dichalcogenides are attractive for nanoelectronics and energy harvesting, where thermal transport critically impacts device reliability, performance, and energy efficiency. Here, we establish hierarchical defect engineering in monola...

Uncertainty-Aware Adaptive Edge Blocking in Heterophilic Graph Neural Networks

Graph Neural Networks (GNNs) deliver strong performance through message passing (MP), yet they can become fragile when graphs contain many heterophilic links or when edge types are predicted incorrectly. Earlier analyses suggest that signed message propagation can reduce over-smo...

On-Orbit Servicing-Integrated Maintenance Strategy for a Satellite Constellation

This paper proposes a maintenance strategy for a satellite constellation that utilizes on-orbit servicing (OOS). Under this strategy, the constellation operator addresses satellite failures in two ways: by deploying new satellites and by recovering failed satellites through OOS....

Secure Multi-party Matrix Invertibility Testing over Small Finite Fields

Abstract removed due to JATS parsing error

Linker Symmetry Lowering as a Strategy to Tune Electronic Properties in Two‐Dimensional Conductive MOFs

ABSTRACT Two‐dimensional conductive metal–organic frameworks (2D cMOFs) have largely relied on highly symmetric linkers that give rise to symmetry‐protected electronic degeneracies. Although such symmetry usually promotes extended conjugation and often leads to high electrical co...

A machine learning framework for predicting and modulating condition-dependent protein phase separation

Protein phase separation is a fundamental process in organizing membraneless organelles and is implicated in pathological conditions. Importantly, this process is dynamic and depends on conditions such as concentration, temperature, and solvent composition. However, current machi...