Suyoung Choi

Energy-Efficient Dynamic Retransmission Timeouts with Enhanced Stability for Constrained Application Protocol-Based Internet of Things Networks via Edge Intelligence-Assisted Cross-Layer Congestion Control

Suyoung Choi

The co-existence of event-driven critical traffic and time-driven periodic traffic inevitably exacerbates cross-layer network congestion in resource-constrained edge environments. Although hybrid protocol architectures integrating the Constrained Application Protocol (CoAP) at the edge and Quick UDP Internet Connections (QUIC) in the core network …

kr (code pays fourni par la source)

Silicon photonic MEMS platform-based air-coupled optomechanical ultrasound receiver at 2.8 MHz with an ultra-compact active acoustic sensing area

Sangwoo Nam, Jae Hyeon Kim, YOUNGJAE PARK, Dong Choi et autres

High-resolution non-contact non-destructive evaluation (NDE) utilizing MHz-range ultrasound in air-coupled environments faces two significant challenges: severe signal attenuation and reduced sensitivity due to transducer miniaturization. Optical ultrasound sensors have emerged as promising candidates to overcome these limitations; however, widespread adoption remains challenging. …

kr (code pays fourni par la source)

Energy-Efficient Dynamic RTO with Enhanced Stability for CoAP-Based IoT Networks

Suyoung Choi

The Constrained Application Protocol (CoAP) is widely adopted to ensure end-to-end reliability in resource-constrained Artificial Intelligence of Things (AIoT) and Wireless Sensor Networks (WSNs). However, CoAP's default retransmission timeout (RTO) mechanism lacks algorithmic responsiveness under volatile channel conditions, and state-of-the-art benchmarks like …

kr (code pays fourni par la source)

3D real-time ultrasound/photoacoustic anatomical/functional imaging platform for hemodynamic response assessment: a feasibility study

Suyoung Choi, Sangwoo Nam, Nizar Guezzi, Myeongchan Kim et autres

The hemodynamic response is a critical physiological indicator for assessing cardiopulmonary function and monitoring therapeutic efficacy in various diseases. Photoacoustic imaging (PAI), which combines the strengths of ultrasound and optical imaging, has emerged as a prominent noninvasive, non-ionizing modality for monitoring and …

kr (code pays fourni par la source)

Learning-Based Design of Mismatched Filters via Unsupervised Deep Optimization for Coded Excitation Ultrasound

Nizar Guezzi, Dong-Kyu Jung, Hyojin Seong, Sangwoo Nam et autres

Coded excitation is widely used in ultrasound imaging to improve the signal-to-noise ratio (SNR), and, in particular, Barker-code-based pulse compression offers both high axial resolution and SNR gain. However, matched filtering yields elevated sidelobes that can degrade image quality, motivating the use …

kr (code pays fourni par la source)

Reference Free Platform Adaptive Locomotion for Quadrupedal Robots using a Dynamics Conditioned Policy

David Rytz, Suyoung Choi, Wanming Yu, Wolfgang Merkt et autres

This article presents Platform Adaptive Locomotion (PAL), a unified control method for quadrupedal robots with different morphologies and dynamics. We leverage deep reinforcement learning to train a single locomotion policy on procedurally generated robots. The policy maps proprioceptive robot state information and …

us, ca (code pays fourni par la source)

Real toric manifolds associated with chordal nestohedra

Suyoung Choi, Younghan Yoon

Toric wedge induction and toric lifting property for piecewise linear spheres with few vertices

Suyoung Choi, Hyeontae Jang, Mathieu Vallée

Abstract Let be an ‐dimensional piecewise linear sphere on , where . There are a canonical action of ‐dimensional torus on the moment‐angle complex , and a canonical action of on the real moment‐angle complex , where is the additive group with …

kr, fr (code pays fourni par la source)

Reference Free Platform Adaptive Locomotion for Quadrupedal Robots using a Dynamics Conditioned Policy

David Rytz, Suyoung Choi, Wanming Yu, Wolfgang Merkt et autres

This article presents Platform Adaptive Locomotion (PAL), a unified control method for quadrupedal robots with different morphologies and dynamics. We leverage deep reinforcement learning to train a single locomotion policy on procedurally generated robots. The policy maps proprioceptive robot state information and …

us, ca (code pays fourni par la source)

Legged Robot State Estimation with Invariant Extended Kalman Filter Using Neural Measurement Network

Donghoon Youm, Hyunsik Oh, Suyoung Choi, Hyeongjun Kim et autres

This paper introduces a novel proprioceptive state estimator for legged robots that combines model-based filters with deep neural networks. In environments where vision systems are not reliable, proprioceptive state estimators become indispensable. Traditionally, proprioceptive state estimators are based on model-based approaches, which …

kr (code pays fourni par la source)

Strong cohomological rigidity of Bott manifolds

Suyoung Choi, Taekgyu Hwang, Hyeontae Jang

We show that two Bott manifolds are diffeomorphic if and only if their integral cohomology rings are isomorphic as graded rings. In fact, we prove that any graded cohomology ring isomorphism between two Bott manifolds is induced by a diffeomorphism.

kr (code pays fourni par la source)

Complete non-singular toric varieties with Picard number 4

Suyoung Choi, Hyeontae Jang, Mathieu Vallée

We classify all complete non-singular toric varieties with Picard number four via a combinatorial framework based on fanlike simplicial spheres and characteristic maps. This classification yields $59$ fanlike seeds with Picard number four, along with all toric manifolds supported by them. As …

kr, be (code pays fourni par la source)