J. Lim

ORCID: 0000-0002-5535-0417
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About
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Research Areas
  • Stellar, planetary, and galactic studies
  • Astronomy and Astrophysical Research
  • Astro and Planetary Science
  • Pulsars and Gravitational Waves Research
  • Tactile and Sensory Interactions
  • Advanced Sensor and Energy Harvesting Materials
  • Gamma-ray bursts and supernovae
  • Solar and Space Plasma Dynamics
  • Astronomical Observations and Instrumentation
  • Interactive and Immersive Displays
  • Galaxies: Formation, Evolution, Phenomena
  • Astrophysics and Star Formation Studies
  • Emotion and Mood Recognition
  • Radio Astronomy Observations and Technology
  • Context-Aware Activity Recognition Systems
  • Particle Accelerators and Free-Electron Lasers
  • Gaze Tracking and Assistive Technology
  • Electrowetting and Microfluidic Technologies
  • Digital Mental Health Interventions
  • Dielectric materials and actuators
  • Astrophysical Phenomena and Observations
  • Graphene and Nanomaterials Applications
  • Astrophysics and Cosmic Phenomena
  • Advanced Materials and Mechanics
  • Gait Recognition and Analysis

Electronics and Telecommunications Research Institute
2011-2024

University of Hong Kong
2021-2023

Daejeon University
2021

Kyung Hee University
2011

Institute of Astronomy and Astrophysics, Academia Sinica
2005-2008

Kwangshin University
1997

Macquarie University
1987-1992

We report the results of a high-frequency survey designed to detect young, distant and short-period pulsars. The Parkes 64-m radio telescope was used at central observing frequency 1500 MHz an area 800 square degrees in region |$270^{\circ} \leq l\leq 20^{\circ} ,|b|\leq 4^{\circ} .$| To ensure that system retained good sensitivity periods less than 10 ms, we sampling intervals 0.3 1.2 ms. detected total 100 pulsars, 46 which were previously unknown. newly discovered pulsars range between 47...

10.1093/mnras/255.3.401 article EN Monthly Notices of the Royal Astronomical Society 1992-04-01

This paper reports soft actuator based tactile stimulation interfaces applicable to wearable devices. The is prepared by multi-layered accumulation of thin electro-active polymer (EAP) films. designed produce electrically-induced convex protrusive deformation, which can be dynamically programmable for wide range stimuli. maximum vertical protrusion <inline-formula> <tex-math notation="LaTeX">${{650}}\,\mu {\mathrm{m}}$</tex-math></inline-formula> and the output force up 255 mN. actuators are...

10.1109/toh.2018.2805901 article EN IEEE Transactions on Haptics 2018-01-01

We report on new nearby L and late-M dwarfs (dphot≤ 30 pc) discovered in our search for ultracool (I–J≥ 3.0, later than M8.0) at low Galactic latitude (|b| < 15°) over 4800 deg2 the Deep Near Infrared Survey of Southern Sky (DENIS) data base. used (≥ M8.0), T with accurate trigonometric parallaxes to calibrate MJ versus I–J colour–luminosity relation. The resulting photometric distances have standard errors ∼15 per cent, which we select candidates dphot≤ pc. measured proper motions from...

10.1111/j.1365-2966.2007.12564.x article EN Monthly Notices of the Royal Astronomical Society 2008-01-09

We propose and demonstrate an all-solid-state tunable binary phase Fresnel lens with electrically controllable focal length. The is composed of a zone plate, circular acrylic frame, dielectric elastomer (DE) actuator which made thin DE layer two compliant electrodes using silver nanowires. Under electric potential, the produces in-plane deformation in radial direction that can compress zones. electrically-induced compresses zones to be contracted as high 9.1% changes length, getting shorter...

10.1364/oe.25.023801 article EN cc-by Optics Express 2017-09-19

To understand the multilateral characteristics of human behavior and physiological markers related to physical, emotional, environmental states, extensive lifelog data collection in a real-world environment is essential. Here, we propose method using multimodal mobile sensing present long-term dataset from 22 subjects 616 days experimental sessions. The contains over 10 000 hours data, including physiological, such as photoplethysmography, electrodermal activity, skin temperature addition...

10.4218/etrij.2020-0446 article EN ETRI Journal 2021-12-08

Speech emotion recognition (SER) is a natural method of recognizing individual emotions in everyday life. To distribute SER models to real-world applications, some key challenges must be overcome, such as the lack datasets tagged with labels and weak generalization model for an unseen target domain. This study proposes multi-path group-loss-based network (MPGLN) support multi-domain adaptation. The proposed includes bidirectional long short-term memory-based temporal feature generator...

10.3390/s21051579 article EN cc-by Sensors 2021-02-24

We demonstrate a polymer-based active-lens module allowing dynamic focus controllable optical system with wide tunable range. The is composed of parallelized two active-lenses convex and concave shaped hemispherical lens structure, respectively. Under operation input voltage signals, each produces translational movement bi-directionally responding to hybrid driving force that combination an electro-active response thin dielectric elastomer membrane electro-static attraction force. Since the...

10.1063/1.4964426 article EN Applied Physics Letters 2016-10-03

The J-PAS survey will observe ~1/3 of the northern sky with a set 56 narrow-band filters using dedicated 2.55 m JST telescope at Javalambre Astrophysical Observatory. Prior to installation main camera, in order demonstrate scientific potential J-PAS, two small surveys were performed single-CCD Pathfinder camera: miniJPAS (~1 deg2 along Extended Groth Strip), and J-NEP (~0.3 around JWST North Ecliptic Pole Time Domain Field), including all as well u, g, r, i. is ~0.5-1.0 magnitudes deeper...

10.1051/0004-6361/202244759 article EN cc-by Astronomy and Astrophysics 2023-01-28

We report our discovery of a nearby wide binary system, LP 714-37 AB. Phan-Bao et al. identified as mid-M dwarf during cross-identification the NLTT and DENIS catalogues. Our CCD images resolve system into with projected angular separation 1.8´´, or 33 AU, low-resolution optical spectra give spectral types M5.5 (LP 714-37A) M7.5 714-37B). This makes AB one very few widely separated (separation >30 AU) low-mass systems known in field, we discuss it context multiplicity properties stars brown dwarfs.

10.1051/0004-6361:200500149 article EN Astronomy and Astrophysics 2005-07-29

The primary research objective of this study is to develop an algorithm pipeline for recognizing human locomotion activities using multimodal sensor data from smartphones, while minimizing prediction errors due differences between individuals. provided the 2023 SHL recognition challenge comprises three types motion and two radio data. Our team, ‘HELP,’ presents approach that aligns all derive a form vector composed 106 features, then blends predictions multiple learning models which are...

10.1145/3594739.3610753 article EN 2023-10-07

view Abstract Citations (39) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Radio Source around eta Carinae White, S. M. ; Duncan, R. A. Lim, J. Nelson, G. Drake, Kundu, We present high spatial resolution radio observations of the peculiar southern star Eta Carinae, made with Australian Telescope. images, at 8 and 9 GHz a 1.0 arcsec show source dimension 10 total flux 0.7 Jy dominated by strong central peak. emission is unpolarized offers...

10.1086/174327 article EN The Astrophysical Journal 1994-07-01

view Abstract Citations (33) References (71) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radio Constraints on Coronal Models for dMe Stars White, S. M. ; Lim, J. Kundu, R. data are used to test coronal models stars. Specifically, we show that photospheric magnetic field observations imply the low corona of a star should be saturated by fields with an average strength in excess 1 kG. In such hot component detected X-ray (temperature order 2 x 107 K) would...

10.1086/173727 article EN The Astrophysical Journal 1994-02-01

This paper proposes a new interactive interface TAXEL, which aims at developing reconfigurable self-morphing visio-haptic interface. We first present the overall architecture and concept of visuo-haptic Key hardware components are developed tested, including three tactile actuators using piezoelectric active linear actuator, passive MR fluid thin film-type respectively, flexible visual display based on light-waveguide technology. Using components, platform that includes 8×16 array is...

10.1109/whc.2011.5945458 article EN 2011-06-01

Modified poly(ethylene terephthalate) (MPET) samples of both powder and fiber types, which contain sodium 5-sulfodimethyl isophthalate as the third comonomer component, were explored an adsorbent for elimination heavy metal ions, e.g., Cr3+, Pb2+, Cd2+, in wastewater. The ions preferentially adsorbed on finer particles at a lower temperature pH 4 exothermically chemisorbed onto MPETs via ionic interaction. It was also found that among Cr3+ is most adsorbed, followed by Pb2+ Cd2+ adsorption...

10.1002/(sici)1097-4628(19970207)63:6<773::aid-app9>3.0.co;2-k article EN Journal of Applied Polymer Science 1997-02-07

Reversible stress-whitening in a nanocomposite film spontaneously formed from photocurable PDMS solution enables reliable and real-time monitoring of human motion the form wearable interface.

10.1039/d1tc00256b article EN Journal of Materials Chemistry C 2021-01-01

10.1109/ictc62082.2024.10827005 article EN 2022 13th International Conference on Information and Communication Technology Convergence (ICTC) 2024-10-16

Abstract This study investigated whether hydroxyapatite (HAp)-mineralized graphene (GR) film could support osteogenic differentiation of human adipose-derived, stromal cell (hASCs) in vitro. GR was produced by a chemical vapor deposition (CVD) method and the physical characteristics film, which functionalized with HAp mineralization following ultraviolet-ozone (GR_UVO) treatment, were subsequently validated. Results scanning electron microscopy, x-ray photoelectron spectroscopy Raman showed...

10.1088/2053-1583/abe924 article EN 2D Materials 2021-02-23

In 2024, we will hold a research paper competition (the third Human Understanding AI Paper Challenge) for the and development of artificial intelligence technologies to understand human daily life. This document introduces datasets that be provided participants in competition, summarizes issues consider data processing learning model development.

10.48550/arxiv.2403.16509 preprint EN arXiv (Cornell University) 2024-03-25

Observations of the quasars 0606-795 and 0637-752 as tail Comet Wilson swept across them on May 1 2, 1987, showed a three-fold increase in scintillation index over that nearby compact radio sources outside tail. Two regimes have been identified: (1) small-scale turbulence 10-40 km develops near tail-axis; (2) large-scale 90-350 is present off-axis transition region between plasma solar wind. At distance 0�12 AU downstream from nucleus r.m.s. electron-density variation these turbules 4-8 cm-3...

10.1071/ph900801 article EN Australian Journal of Physics 1990-01-01
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