Hojun Choi

ORCID: 0000-0002-4178-1427
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About
Contact & Profiles
Research Areas
  • Animal Genetics and Reproduction
  • Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
  • CRISPR and Genetic Engineering
  • Congenital heart defects research
  • Topic Modeling
  • Teleoperation and Haptic Systems
  • Advanced Battery Technologies Research
  • Photovoltaic System Optimization Techniques
  • AI in Service Interactions
  • Wireless Power Transfer Systems
  • Magnetic Properties of Alloys
  • UAV Applications and Optimization
  • Robot Manipulation and Learning
  • Ergonomics and Musculoskeletal Disorders
  • Virtual Reality Applications and Impacts
  • Genomics and Chromatin Dynamics
  • solar cell performance optimization
  • Diverse Topics in Contemporary Research
  • Electrostatic Discharge in Electronics
  • Epigenetics and DNA Methylation
  • Energy Harvesting in Wireless Networks
  • Synthesis and properties of polymers
  • Consumer Perception and Purchasing Behavior
  • Simulation and Modeling Applications
  • Nutrition, Health and Food Behavior

University of Nebraska–Lincoln
2025

Hanyang University
2022-2024

Seoul National University
2022-2023

Nagoya University
2023

Sungkyunkwan University
2023

Pohang University of Science and Technology
2020

Advanced Institute of Convergence Technology
2006

Avian germ cells can be distinguished by certain characteristics during development. On the basis of these characteristics, used for germline transmission. However, dynamic transcriptional landscape avian development is unknown. Here, we a novel germ-cell-tracing method to monitor and isolate chicken at different stages We targeted deleted in azoospermia like (DAZL) gene, germ-cell-specific marker, integrate green fluorescent protein (GFP) reporter gene without affecting endogenous DAZL...

10.1016/j.csbj.2022.03.040 article EN cc-by-nc-nd Computational and Structural Biotechnology Journal 2022-01-01

Although birds have been used historically as a model animal for immunological research, resulting in remarkable achievements, immune cell development themselves has yet to be fully elucidated. In this study, we firstly generated an immunodeficient chicken using CRISPR/Cas9-mediated recombination activating gene 1 ( RAG1 ) knockout, investigate avian-specific development. Unlike previously reported immunoglobulin (Ig) heavy chain knockout chickens, the proportion and of B cells both +/- -/-...

10.3389/fimmu.2022.892476 article EN cc-by Frontiers in Immunology 2022-08-11

Abstract The spectral clustering algorithm (SCA) is developed for endpoint detection (EPD) of Si 3 N 4 plasma etching using optical emission spectroscopy (OES). OES signals are collected in real‐time and filtered discrete wavelet transform (DWT). SCA 3648 full‐spectrum wavelengths with DWT filtering improves signal‐to‐noise ratio (SNR) by 2.78 times compared to single‐wavelength related 2 molecule 1.0% relative area etching. reactants products selected enhance the SNR SCA. 87 3.57...

10.1002/ppap.202200238 article EN Plasma Processes and Polymers 2023-03-22

Germ cell mitotic arrest is conserved in many vertebrates, including birds, although the time of entry or exit into quiescence phase differs. Mitotic essential for normal differentiation male germ cells spermatogonia and accompanies epigenetic reprogramming meiosis inhibition from embryonic development to post-hatch. However, was not well studied chickens because difficulty obtaining pure relevant developmental stage.We performed single-cell RNA sequencing investigate transcriptional...

10.1186/s40104-022-00712-4 article EN cc-by Journal of Animal Science and Biotechnology/Journal of animal science and biotechnology 2022-06-06

This study investigated the effect of synthesis time and composition on magnetic properties FeCo nanoparticles. Fe75Co25, Fe66Co34, Fe52Co48 nanoparticles were synthesized by polyol method. The saturation magnetization Fe75 Co25, was 178 emu/g, 191 emu/g 197 respectively. coercivity 113 Oe, 131 Oe 89.2 also varied (2 h 3 h) to determine optimal time. for 2 h, 243 202 46 111 highest lowest obtained using a h. Based these results, it confirmed that had among all compositions tested,

10.1166/jnn.2018.15477 article EN Journal of Nanoscience and Nanotechnology 2018-06-29

Mitotic arrest is necessary for the embryonic development of germ cells, and thus, it important to understand signaling pathways that regulate mitotic arrest. Here, we investigated pathway dynamics male chicken cells during by single-cell transcriptome analysis using germ-cell tracing models. We identified change at transcriptional level after sex determination. found several components BMP, Notch, JAK-STAT were downregulated mitotic-arrest stage reactivated 1 week hatching when all are...

10.1002/2211-5463.13600 article EN cc-by FEBS Open Bio 2023-03-24

In this study, a new robot motion teaching method is proposed for dynamic robotic tasks. the framework, path geometry definition and timeparametrization process are separated. For definition, waypoint-based used to secure accuracy safety, teaching-by-teleoperation extract intuitive human easily. The direct dynamics transfer algorithm developed project into pre-defined according normalized arc-length of two different paths. overall procedure empirically validated with 6 DoF collaborative...

10.1109/ur49135.2020.9144982 article EN 2020-06-01

In this study, we synthesized conductive polymer, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) having high concentration, proper viscosity, and electrical conductivity of 500 S/cm for fluorine-free binder lithium ion batteries (LIBs) without agents such as super-P, carbon nanotube, graphene. Only one water-based polymer could act both a agent high-nickel cathode, NCM811. The aqueous is environment-friendly processable fabrication cathode. However, in an environment,...

10.1149/ma2024-02197mtgabs article EN Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) 2024-11-22

Measuring a ship's draft is critical task that enhances the efficiency of bulk cargo transportation and prevents accidents such as vessel damage due to exceeding maximum depth. Traditional measurement methods require workers approach exterior ship for measurement, posing risks caused by marine environmental factors like waves wind. To address these issues, this paper proposes an automatic framework utilizing drones. The proposed estimates drone's position transform images into undistorted...

10.30693/smj.2024.13.12.90 article EN Korean Institute of Smart Media 2024-12-31

In this article, a semantic web implementation method was proposed through the development of agent performing ontology-based intelligence search in mobile environments. The service Fox provides based that has been improved from existing keyword search. we focused on SWRL backward chaining inference engine and comprising with cube user interface, which is friendly relatively easy abstraction query.

10.1109/mdm.2006.92 article EN 2006-01-01

10.5220/0011724500003417 article EN cc-by-nc-nd Proceedings of the 17th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications 2023-01-01

Given a pretrained encoder-based language model, how can we accurately compress it without retraining? Retraining-free structured pruning algorithms are crucial in model compression due to their significantly reduced cost and capability prune large models. However, existing retraining-free encounter severe accuracy degradation, as they fail handle errors, especially at high rates. In this paper, propose K-prune (Knowledge-preserving pruning), an accurate algorithm for focuses on preserving...

10.48550/arxiv.2308.03449 preprint EN other-oa arXiv (Cornell University) 2023-01-01

The advent of large language models (LLMs) has opened up new opportunities in the field mobile task automation. Their superior understanding and reasoning capabilities allow users to automate complex repetitive tasks. However, due inherent unreliability high operational cost LLMs, their practical applicability is quite limited. To address these issues, this paper introduces MobileGPT, an innovative LLM-based automator equipped with a human-like app memory. MobileGPT emulates cognitive...

10.48550/arxiv.2312.03003 preprint EN cc-by arXiv (Cornell University) 2023-01-01

Users have reported that their drones unexpectedly shutoff even when they show more than 10% remaining battery capacity. We discovered the causes of these unexpected shutoffs to be significant thermal degradation a cell caused by coupling between and cells. This large voltage drop for affected drone heat dissipation, which leads low supply shutoffs. paper describes design implementation battery-aware power management framework designed specifically drones. Our provides an accurate...

10.1145/3489517.3530622 article EN Proceedings of the 59th ACM/IEEE Design Automation Conference 2022-07-10
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