University of Electro-Communications

Modelling Terahertz Wave Generation in InAs Quantum-Dot Containing GaAs-Based Photoconductive Antenna

InAs quantum-dot-containing GaAs-based photoconductive antenna (PCA) devices are promising for terahertz (THz) generation under below-bandgap excitation by ultrafast laser pulses. This paper describes the results of rate equation analyses of these devices by assuming the two-step...

Statistical properties of internal modulation in pulsating aurora

Abstract. We statistically investigated the occurrence characteristics of internal modulation (IM), a rapid intensity modulation of a few hertz embedded in pulsating aurora (PsA), using high-speed ground-based optical data obtained with qCMOS cameras. For datasets acquired at Kir...

Seismo-ripples

Earthquake prediction has long been considered one of the greatest challenges in the global scientific community due to the complex and uncertain nature of seismogenic processes, along with the prevailing consensus that earthquakes are inherently unpredictable. Here, we present a...

A Low-Power PicoRV32-Based SoC with an Integrated Hardware Accelerator for Real-Time ECG R-Peak Anomaly Detection in 180-nm CMOS

Continuous electrocardiogram (ECG) monitoring in wearable biomedical devices requires processing architectures that balance computational simplicity with hardware efficiency. This paper presents a compact, silicon-proven System-on-Chip (SoC) integrating a PicoRV32 (RV32I) RISC-V...

Atomic-Scale Insights into Termination-Dependent Interfacial Electronic Properties and Charge Transfer at MAPbI3/Rare-Earth Oxide (CeO2, La2O3) Heterojunctions

This study combines first-principles calculations with experimental investigations to elucidate the interfacial mechanisms of heterojunctions formed between MAPbI3 and rare-earth oxides (CeO2 and La2O3). For the MAPbI3/CeO2 and MAPbI3/La2O3 systems, four interfacial configuration...

Spinal interneuronal populations encode static hindlimb posture in the cat

Proprioceptive signals from primary afferents often correlate with single-joint states (but can also reflect multi-joint configuration), whereas neuronal populations in the cerebral cortex represent limb endpoint postures. Where and how this transformation emerges along the somat...

Energy offsets between the Er 3+ 4 f -states and the GaAs energy levels important for photon ratchet intermediate-band solar cells

The lifetime of the carriers present in the intermediate bands is short, and thus an additional band at slightly lower energies is introduced in photon ratchet intermediate-band solar cells to reduce the impact of the intermediate-band lifetime. This so-called ratchet band should...

Robotic 3-DoF rotation of oocytes driven by acoustic microstreaming

The rotational operation of oocytes plays a critical role in embryo engineering, particularly in assisted reproductive technology, cloning, and gene research. The conventional manual method relies heavily on operator experience and repetitive trial-and-error processes, while exis...

Computer-Assisted Workflow for DNA Origami-Engineered Triangular Nanopores

Abstract Synthetic nanopores engineered by DNA origami provide a highly biocompatible and structurally programmable platform for elucidating the transmembrane mechanisms of functional macromolecules. However, engineering large DNA nanopores exceeding 30 nm in width remains a sign...

Autoparallelity of quantum statistical manifolds in light of quantum estimation theory

In this paper we study the autoparallelity w.r.t. the e-connection for an information-geometric structure called the SLD structure, which consists of a Riemannian metric and mutually dual e- and m-connections, induced on the manifold of strictly positive density operators. Unlike...

Computed Tomography Reconstruction Algorithm Using Markov Random Field Model

X-ray computed tomography (CT) reveals the materials’ internal structures non-destructively from a tilt series of projected images. Filtered back projection (FBP) is a widely-adopted reconstruction algorithm in CT owing to its small computational cost. Under low-dose or sparse-vi...

Commodity WiFi Can Capture Your Respiration Even the Motion Interference Exists

As one widely used wireless technique, WiFi has the potential to perform non-contact monitoring of respiration. While pioneering works have demonstrated promising performance, they inevitably ignore the impact of pervasive motion interference caused by non-target body areas or ne...

Pinwheel Scheduling with Real Periods

For a sequence of tasks, each with a positive integer period, the pinwheel scheduling problem involves finding a valid schedule in the sense that the schedule performs one task per day and each task is performed at least once every consecutive days of its period. It had been conj...

Isotropic-carrier-transport perovskite single crystal enables high-photoresponsivity solar-blind photodetectors for selective flame monitoring

Low-dimensional halide perovskites are promising candidates for solar-blind ultraviolet photodetectors. However, simultaneously achieving high photoresponsivity and low dark current remains challenging, due to the restricted transport and collection of photogenerated carriers cau...

Solvent-Dependent Role of SnF2 in DMSO-Free Tin Halide Perovskite Solar Cells

Abstract SnF2 is widely used as an additive to suppress Sn2+ oxidation in tin perovskite solar cells (Sn-PVK-PVs). However, its effect differed between the two processing routes examined here. In this study, we evaluated the influence of SnF2 addition on dimethyl sulfoxide (DMSO)...

Advanced Multimodal X-ray Visualization Techniques for Unraveling Catalytic Performance and Degradation Mechanisms of Metal Nanoparticles in Fuel Cells

Abstract This Account highlights the transformative advances enabled by the world-first BL36XU beamline dedicated to in situ and operando characterization of metal nanoparticles and adsorbed species in polymer electrolyte fuel cells (PEFCs). While PEFCs hold great promise for sus...

Membership categorization in children’s pretend play

Abstract Drawing on data from 24 hours of video-recorded interaction of two bilingual (Korean, English) children aged between three and five, we use multimodal conversation analysis and membership categorization analysis to show how pretend membership categories are invoked and m...