Nam Chul Kim

ORCID: 0000-0003-1332-3071
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About
Contact & Profiles
Research Areas
  • Image Retrieval and Classification Techniques
  • Advanced Image and Video Retrieval Techniques
  • Amyotrophic Lateral Sclerosis Research
  • Image and Signal Denoising Methods
  • Medical Image Segmentation Techniques
  • Advanced Vision and Imaging
  • Advanced Image Fusion Techniques
  • Advanced Data Compression Techniques
  • Advanced Image Processing Techniques
  • RNA Research and Splicing
  • Face and Expression Recognition
  • Genetic Neurodegenerative Diseases
  • Mitochondrial Function and Pathology
  • Genetics, Aging, and Longevity in Model Organisms
  • Image Enhancement Techniques
  • Image Processing Techniques and Applications
  • Handwritten Text Recognition Techniques
  • Neurobiology and Insect Physiology Research
  • Image and Video Stabilization
  • CRISPR and Genetic Engineering
  • Engineering Technology and Methodologies
  • Face recognition and analysis
  • 3D IC and TSV technologies
  • Hereditary Neurological Disorders
  • Cholinesterase and Neurodegenerative Diseases

St. Jude Children's Research Hospital
2013-2024

University of Minnesota, Duluth
2019-2024

University of Minnesota
2024

University of Minnesota System
2024

Kyungpook National University
2005-2023

Institute of Molecular and Cell Biology
2016

Kyung Hee University
2013-2014

University of Alabama at Birmingham
2007-2012

In this paper, we propose a content-based image retrieval method based on an efficient combination of multiresolution color and texture features. As its features, autocorrelo- grams the hue saturation component images in HSV space are used. BDIP BVLC moments value adopted. The features extracted wavelet domain combined. dimension combined feature vector is determined at point where accuracy becomes saturated. Experimental results show that proposed yields higher than some conventional...

10.1109/tmm.2008.2001357 article EN IEEE Transactions on Multimedia 2008-10-01

We propose two new texture features, block difference of inverse probabilities (BDIP) and variation local correlation coefficients (BVLC), for content-based image retrieval (CBIR) then present an method based on the combination BDIP BVLC moments. uses in blocks to measure image's brightness variations well. smoothness Experimental results show that presented yields about 12% better performance precision versus recall 0.13 average normalized modified rank (ANMRR) than using wavelet

10.1109/tcsvt.2003.816507 article EN IEEE Transactions on Circuits and Systems for Video Technology 2003-09-01

Neuronal function depends on the retrograde relay of growth and survival signals from synaptic terminal, where neuron interacts with its targets, to nucleus, gene transcription is regulated. Activation Bone Morphogenetic Protein (BMP) pathway at Drosophila larval neuromuscular junction results in nuclear accumulation phosphorylated form factor Mad motoneuron nucleus. This turn regulates genes that control growth. How BMP signaling terminal relayed cell body nucleus regulate unknown. We show...

10.1242/jcs.094292 article EN Journal of Cell Science 2012-01-01

In this paper, we propose a color image enhancement based on the single-scale retinex (SSR) with just noticeable difference (JND)-based nonlinear filter. proposed method, an input RGB is transformed into HSV image. Under assumption of white-light illumination, S and V component images are enhanced. image, illumination first estimated using JND-based The output then obtained by subtracting some portion log signal from histogram modeling next applied to enhanced in proportion ratio Finally...

10.1109/iscas.2007.378664 article EN 2022 IEEE International Symposium on Circuits and Systems (ISCAS) 2007-05-01

Abstract Color, texture, and shape act as important information for images in human recognition. For content‐based image retrieval, many studies have combined color, features to improve the retrieval performance. However, there not been powerful methods combining all features. This study proposes a method that uses local global of shape. The color are extracted from autocorrelogram; texture magnitude complete binary pattern Gabor correlation revealing characteristics; singular value...

10.4218/etrij.2022-0071 article EN publisher-specific-oa ETRI Journal 2023-01-16

We propose a simple yet efficient method which reduces the blocking artifact in block-coded images by using wavelet transform. An image is considered as set of one-dimensional signals, and so all processing including transform are one-dimensionally executed. The reduction operation applied to only neighborhood each block boundary at first second scales. key idea behind remove component reveals stepwise discontinuities boundaries. Each classified into one shade region, smooth edge step...

10.1109/76.678618 article EN IEEE Transactions on Circuits and Systems for Video Technology 1998-06-01

In this paper, we present an improved image formation model and propose a color enhancement using single-scale retinex based on the model. presented model, input is represented as product of global illumination, local reflectance. proposed enhancement, RGB converted into HSV image. Under assumption white-light H S component images remain they are only V enhanced image, illumination estimated by applying linear LPF with wide support region JND (just noticeable difference)-based nonlinear...

10.5281/zenodo.41073 article EN European Signal Processing Conference 2008-08-25

Refinement of neural circuits during development requires formation and elimination synaptic connections, a process governed by activity-dependent mechanisms developmental genetic programs. Bone Morphogenetic Protein (BMP) retrograde signaling through the type II receptor Wishful thinking (Wit) is essential for growth functional Drosophila larval neuromuscular junction. However, little known about genes that are regulated pathway to effect proper transmission. We have identified...

10.1002/dneu.22021 article EN Developmental Neurobiology 2012-04-03

Adult-onset inherited myopathies with similar pathological features, including hereditary inclusion body myopathy (hIBM) and limb-girdle muscular dystrophy (LGMD), are a genetically heterogeneous group of muscle diseases. It is unclear whether these initiated by mutations in distinct classes genes etiologically related. Here, we exploit genetic model system to establish mechanistic link between diseases caused two genes, hnRNPA2B1 DNAJB6. Hrb98DE mrj the Drosophila melanogaster homologs...

10.1093/hmg/ddv627 article EN Human Molecular Genetics 2016-01-06

10.1016/j.patrec.2018.05.010 article EN Pattern Recognition Letters 2018-05-22

Mutations in coiled-coil-helix-coiled-coil-helix domain containing 10 (CHCHD10) can cause amyotrophic lateral sclerosis and frontotemporal dementia (ALS-FTD). However, the underlying mechanisms are unclear. Here, we generate CHCH10S59L-mutant Drosophila melanogaster HeLa cell lines to model CHCHD10-associated ALS-FTD. The CHCHD10S59L mutation results toxicity several tissues mitochondrial defects. independently affects TDP-43 PINK1 pathways. expression increases insolubility translocation....

10.1038/s41467-021-22145-9 article EN cc-by Nature Communications 2021-03-26

Abstract Bone Morphogenetic Protein (BMP) signaling mediated by the receptor Wishful thinking (Wit) is essential for nervous system development in Drosophila . Mutants lacking wit function show defects neuromuscular junction and function, specification of neurosecretory phenotypes, eclosion behavior that result lethality. The ligand Glass bottom boat, ortholog mammalian BMP‐7, which acts as a retrograde signal through Wit receptor. In order to identify transcriptional targets BMP pathway...

10.1002/dvdy.22368 article EN Developmental Dynamics 2010-07-22

Gallbladder carcinoma (GBCA) is one of the most aggressive malignancies. It usually diagnosed at an advanced stage, and prognosis remains poor despite advances in imaging techniques surgical treatment. Overexpression multidrug resistance-associated proteins (MRPs) tumor cells a major cause intrinsic resistance phenotype. Despite documented importance MRP expression many carcinomas, prognostic significance MRP2 primary GBCA not known. Immunostaining for was performed on tissue samples...

10.1155/2013/527534 article EN cc-by BioMed Research International 2013-01-01

In this paper, a Wiener filtering method in wavelet domain is proposed for restoring an image corrupted by additive white noise. The utilizes the multiscale characteristics of transform and local statistics each subband. size filter window estimating subband varies with scale. every pixel are estimated using only pixels which have similar statistical property. Experimental results show that has better performance over conventional Lee fixed size.

10.1109/tencon.1997.647250 article EN 2002-11-23
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