Agency for Defense Development

A Multi‐Objective Optimization and Decision‐Making Framework for Safety‐Critical Ground Vehicle Endurance Tests

ABSTRACT Accelerated endurance testing for safety‐critical ground vehicles requires reproducing field‐induced fatigue within limited time while maintaining stable and reliable evaluation conditions. However, conventional procedures rely on empirical rules or component‐level metri...

Fusion of CNN and swin transformer for robust lung sound classification

Abstract Automatic lung sound classification plays a pivotal role in the diagnosis of chronic respiratory diseases, enabling early screening and informed clinical decisions. However, evaluating model performance on imbalanced datasets, such as the ICBHI 2017, remains challenging....

An IMM Extension of RBPMF for Terrain-Referenced Navigation Under Radar Return Ambiguity

Terrain-referenced navigation (TRN) relies on nonlinear terrain matching, which can produce multimodal position uncertainty that should be retained during estimation. Accuracy can deteriorate when the relative probabilities of ground and canopy returns vary over time because a fi...

Interface-driven boost in the performance and stability of protonic ceramic electrochemical cells

Abstract Interfacial resistance remains a key challenge in developing high-performance and durable protonic ceramic electrochemical cells (PCECs), especially at low temperatures. Here, we present a systematic interface engineering strategy that quantitatively correlates interfaci...

Branch-type dynamic vibration absorbers for enhanced and frequency-robust vibration suppression

Minimizing vibration transmission from mounted machinery remains an important challenge in vibration engineering. Although isolation mounts reduce vibration transmission, residual vibrations can remain significant when excitation forces are large. Moreover, practical machines suc...

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....