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Chang-Gun Lee

Seoul National University · 情報科学

研究室紹介

Professor Chang-Gun Lee's research lab specializes in real-time systems and embedded systems, with a strong focus on scheduling theory, cache-related preemption analysis, and system predictability in safety-critical environments. The lab develops advanced techniques for bounding preemption delays in multitasking systems, particularly in the context of instruction caching and fixed-priority scheduling, to enhance timing predictability in real-time applications. Additionally, the lab explores dynamic QoS adaptation, radar scheduling, and system utilization optimization in complex embedded systems. Beyond computing systems, the lab also engages in biomedical research, particularly on osteoblast regulation and anti-osteoporotic compounds such as morroniside.

real-time systemscache preemption analysisscheduling theoryembedded systemsosteoporosis

Research Overview

Papers
206
Total Citations
3,359
Papers (5y)
71
Primary Field
情報科学

Research Output Trend

Figures are computed from collected data and may differ slightly.

Publications per year (5y)
71total
2021
2022
2023
2024
2025
Citations per year (5y)
322total
20212022202320242025

Selected Papers

15
1
Article|288 citations·2009
A study on the tribological characteristics of graphite nano lubricants
Chang-Gun Lee, Yujin Hwang, Youngmin Choi, Jae-Keun Lee, Cheol Choi, Je-Myung Oh
SJR Q2International Journal of Precision Engineering and Manufacturing
Mechanical EngineeringEngineering
2
Article|270 citations·1998
Analysis of cache-related preemption delay in fixed-priority preemptive scheduling
Chang-Gun Lee, Hoosun Hahn, Yang-Min Seo, Sang Lyul Min, Rhan Ha, Seongsoo Hong, Chang Yun Park, Minsuk Lee, Chong Sang Kim
SJR Q1IEEE Transactions on Computers

We propose a technique for analyzing cache-related preemption delays of tasks that cause unpredictable variation in task execution time in the context of fixed-priority preemptive scheduling. The proposed technique consists of two steps. The first step performs a per-task analysis to estimate cache-related preemption cost for each execution point in a given task. The second step computes the worst case response time of each task that includes the cache-related preemption delay using a response t

Hardware and ArchitectureComputer Science
3
Article|88 citations·2001
Bounding cache-related preemption delay for real-time systems
Chang-Gun Lee, Kwangpo Lee, Joosun Hahn, Yang-Min Seo, Sang Lyul Min, Rhan Ha, Seongsoo Hong, Chang Yun Park, Minsuk Lee, Chong Sang Kim
SJR Q1IEEE Transactions on Software Engineering

Cache memory is used in almost all computer systems today to bridge the ever increasing speed gap between the processor and main memory. However, its use in multitasking computer systems introduces additional preemption delay due to the reloading of memory blocks that are replaced during preemption. This cache-related preemption delay poses a serious problem in realtime computing systems where predictability is of utmost importance. We propose an enhanced technique for analyzing and thus boundin

Hardware and ArchitectureComputer Science
4
Article|62 citations·2022
Bacteroides fragilis Toxin Induces Intestinal Epithelial Cell Secretion of Interleukin-8 by the E-Cadherin/β-Catenin/NF-κB Dependent Pathway
Chang-Gun Lee, Soonjae Hwang, Sun-Yeong Gwon, Chanoh Park, Minjeong Jo, Ju-Eun Hong, Ki‐Jong Rhee
SJR Q1BiomedicinesOA

toxin (BFT), which can induce ectodomain cleavage of E-cadherin and IL-8 secretion through the β-catenin, NF-κB, and MAPK pathways in intestinal epithelial cells. However, it is still unclear whether E-cadherin cleavage is required for BFT induced IL-8 secretion and the relative contribution of these signaling pathways to IL-8 secretion. Using siRNA knockdown and CRISPR knockout studies, we found that E-cadherin cleavage is required for BFT mediated IL-8 secretion. In addition, genetic ablation

Infectious DiseasesMedicine
5
Article|31 citations·2004
Enhanced utilization bounds for QoS management
Chang-Gun Lee, Lui Sha, A. Peddi
SJR Q1IEEE Transactions on Computers

In many practical real-time applications, there is a given set of task frequencies (i.e., inverse of task periods) corresponding to predetermined QoS options that the applications can choose. For example, in audio applications, the typical choices of playback frequencies are for CD quality, radio quality, and phone quality. Similar configurations can be found in streaming video and in control applications. In such systems, applications dynamically arrive requesting one of the periods provided by

Hardware and ArchitectureComputer Science
6
Article|29 citations·2004
Radar dwell scheduling considering physical characteristics of phased array antenna
Chang-Gun Lee, Phil-Su Kang, Chi‐Sheng Shih, Lui Sha

This paper proposes novel techniques for scheduling radar dwells in phased array radar systems. In order to handle complex physical characteristics such as dwell interleaving, transmitting duty cycle constraint, and energy constraint, we propose a notion of schedulability envelope. The schedulability envelope designed offline hides the details of complex radar dwell scheduling and provides a simple measure for the schedulability check. Using the schedulability envelope, the proposed technique ca

Hardware and ArchitectureComputer Science
7
Article|24 citations·2021
Anti-Osteoporotic Effect of Morroniside on Osteoblast and Osteoclast Differentiation In Vitro and Ovariectomized Mice In Vivo
Chang-Gun Lee, Jeonghyun Kim, Seung Hee Yun, Seokjin Hwang, Hyoju Jeon, Eunkuk Park, Seon‐Yong Jeong
SJR Q1International Journal of Molecular SciencesOA

Bone remodeling is a continuous process of bone synthesis and destruction that is regulated by osteoblasts and osteoclasts. Here, we investigated the anti-osteoporotic effects of morroniside in mouse preosteoblast MC3T3-E1 cells and mouse primary cultured osteoblasts and osteoclasts in vitro and ovariectomy (OVX)-induced mouse osteoporosis in vivo. Morroniside treatment enhanced alkaline phosphatase activity and positively stained cells via upregulation of osteoblastogenesis-associated genes in

Molecular BiologyBiochemistry, Genetics and Molecular Biology
8
Article|20 citations·2004
Online QoS Optimization Using Service Classes in Surveillance Radar Systems
Chang-Gun Lee, Chi‐Sheng Shih, Lui Sha
SJR Q2Real-Time Systems
Hardware and ArchitectureComputer Science
9
Article|16 citations·2009
우리나라 지역의 총요소생산성과 결정요인 분석 : DEA와 2SLS를 이용하여
이창근, 김의준, 최명섭

본 연구의 목적은 우리나라 지역의 총요소생산성 결정요인을 분석하는 데 있다. 우리나라 지역을 3대 광역경제권으로 설정하였으며, 자료포락분석(DEA: Data Envelopment Analysis)을 통해 외환위기 이후 1998~2005년 동안의 총요소생산성을 구하였다. 지역내총생산의 증가율은 총요소생산성에 양의 관계를 보여 Verdoon의 법칙이 성립하였다. 수강권의 경우 R&D 요소가 총요소생산성을 견인하였으며, 중서부권에서는 인적자본이 보다 중요하였다. 집적경제변수인 산업다양성지수는 동부권을 제외한 나머지 권역에서 총요소생산성에 긍정적 영향을 끼쳐 향후 우리경제에서 산업구조의 변화 등 지역의 질적인 측면은 더욱 고려될 필요가 있었다.

10
Article|14 citations·2022
Pulsed Electromagnetic Field (PEMF) Treatment Reduces Lipopolysaccharide-Induced Septic Shock in Mice
Chang-Gun Lee, Chanoh Park, Soonjae Hwang, Ju-Eun Hong, Minjeong Jo, Minseob Eom, Yong‐Heum Lee, Ki‐Jong Rhee
SJR Q1International Journal of Molecular SciencesOA

Despite advances in medicine, mortality due to sepsis has not decreased. Pulsed electromagnetic field (PEMF) therapy is emerging as an alternative treatment in many inflammation-related diseases. However, there are few studies on the application of PEMF therapy to sepsis. In the current study, we examined the effect of PEMF therapy on a mouse model of lipopolysaccharide (LPS)-induced septic shock. Mice injected with LPS and treated with PEMF showed higher survival rates compared with the LPS gro

PhysiologyMedicine
11
Article|13 citations·2018
Histological Evaluation of Bioresorbable Threads in Rats
Chang-Gun Lee, Jaeyun Jung, Samnoh Hwang, Chan Oh Park, Soonjae Hwang, Minjeong Jo, Min Hi Sin, Hyun Ho Kim, Ki‐Jong Rhee
Korean Journal of Clinical Laboratory ScienceOA

Chang Gun Lee, Jaeyun Jung, Samnoh Hwang, Chan Oh Park, Soonjae Hwang, Minjeong Jo, Min Hi Sin, Hyun Ho Kim, and Ki-Jong Rhee. Korean J Clin Lab Sci. 2018;50:217-24. https://doi.org/10.15324/kjcls.2018.50.3.217

Immunology and AllergyMedicine
12
Article|13 citations·2011
범죄발생률과 경기변동 간의 비대칭 구조와 영향요인 분석
이창근, 김의준

본 연구의 목적은 범죄발생과 실업 등 경제적 상황의 시계열적 분포 사이에서 범죄발생률이 경기침체기와 경기회복기에 어떻게 다르게 나타나는지를 분석하는데 있다. 경기회복 내지 경기침체 등 경제적 여건 변화에 따라 과연 범죄행위는 범죄유형별로 어떻게 비대칭적으로 반응하는지를 살펴보기 위해 비대칭 함수를 구성하였다. 실업률을 경제변수로 하여 분석하였을 때 사기범죄발생률의 경우 경기침체기의 증가율이 경기회복기의 증가율을 상회하였다. 강도범죄발생률의 경우에도 경기침체기에 관련 범죄가 오히려 증가하는 것으로 나타났다. 하지만, 5대 강력범죄발생률의 경우 경기회복기의 계수값이 약 2.187 높아 경기회복기에 관련 범죄가 증가하였고 통계적으로도 비대칭 구조가 유의하였다. 경제관련 범죄들은 구직의 기회보다는 소득 수준과 보다 밀접한 관련이 있는 것으로 확인되었다. 범죄유형별 검거율은 범죄발생에 있어서 억제력으로 작용하였다. 궁극적으로 범죄유형별로, 경제활동 제공기회의 여부와 안정적 소득의 지속 여부에

13
Article|12 citations·2022
Effects of Loganin on Bone Formation and Resorption In Vitro and In Vivo
Chang-Gun Lee, Do-Wan Kim, Jeonghyun Kim, Laxmi Prasad Uprety, Kang-Il Oh, Shivani Singh, Jisu Yoo, Hyun‐Seok Jin, Tae Hyun Choi, Eunkuk Park, Seon‐Yong Jeong
SJR Q1International Journal of Molecular SciencesOA

Osteoporosis is a disease caused by impaired bone remodeling that is especially prevalent in elderly and postmenopausal women. Although numerous chemical agents have been developed to prevent osteoporosis, arguments remain regarding their side effects. Here, we demonstrated the effects of loganin, a single bioactive compound isolated from Cornus officinalis, on osteoblast and osteoclast differentiation in vitro and on ovariectomy (OVX)-induced osteoporosis in mice in vivo. Loganin treatment incr

Molecular BiologyBiochemistry, Genetics and Molecular Biology
14
Article|11 citations·2017
Data on the anti-tumor effects of Selaginella tamariscina extract and amentoflavone combined with doxorubicin in mice
Chang-Gun Lee, Eun Ha Lee, Cheol-Ho Pan, Kyungsu Kang, Ki-Jong Rhee
SJR Q3Data in BriefOA

Here, we report animal experimental data associated with the article entitled "AKR1B10-inhibitory <i>Selaginella tamariscina</i> extract and amentoflavone decrease the growth of A549 human lung cancer cells in vitro and in vivo" (Jung et al., 2017) [1]. We tested the synergistic anti-tumor effects of <i>Selaginella tamariscina</i> extract and amentoflavone combined with doxorubicin hydrochloride in a nude mouse xenograft model of A549 human lung cancer cells. In our experiment, <i>Selaginella ta

Molecular BiologyBiochemistry, Genetics and Molecular Biology
15
Article|11 citations·2013
지방재정지출의 지역별 효과 분석
이창근
한국지방재정논집

본 연구의 목적은 시·군·구 단위의 지역 차원에서 지방재정지출이 지역경제에 미치는 영향을 분석하는 것이다. 분석시기는 2008~2011년까지이며, 먼저 기능별 지방재정지출의 결정요인을 분석한 결과, 1인당 투자적 지출과 1인당 소비적 지출 모두에 통계적으로 유의한 영향을 끼치는 결정요인은 지역의 인구구조 변수, 비도시화비율로 나타났다. 이러한 결과를 바탕으로 우리나라 228개 시·군·구 지역을 총 8개 지역으로 분류하였고, 이를 다시 고령화 지역과 비도시화 지역으로 재분류하였다. 지역별로 기능별 지방재정지출과 지역경제성장과의 관계 분석결과, 외부요인에 의한 경제위기 상황이나 경기침체 시기에 경기부양을 위한 적극적인 재정조기집행 효과가 모든 지역에서 동일하게 긍정적으로 나타난다고 판단하기 어렵다. 또한, 모든 종류의 기능별 지방재정지출 증대 모두 지역경제성장에 정(+)의 효과를 가져온다고 볼 수 없다. 고령화 지역이나 비도시 지역에서 가장 중요한 것은 중앙정부 주도에 의하기보다 지역별

Research Areas

Hardware and ArchitectureMolecular BiologyComputer Networks and CommunicationsEpidemiologyElectrical and Electronic EngineeringArtificial Intelligence

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