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Jihun Kang(Jihun Kang),Taeyun Kim(Taeyun Kim),Kyung-Do Han(Kyung-Do Han),Jin-Hyung Jung(Jin-Hyung Jung),Su-Min Jeong(Su-Min Jeong),Yo Hwan Yeo(Yo Hwan Yeo),Kyuwon Jung(Kyuwon Jung),Hyun Lee(Hyun Lee) 한국역학회 2023 Epidemiology and Health Vol.45 No.-
OBJECTIVES: We examined the associations of socioeconomic factors, health behaviors, and comorbidities with early-onset lung cancer. METHODS: The study included 6,794,287 individuals aged 20-39 years who participated in a Korean national health check-up program from 2009 to 2012. During the follow-up period, 4,684 participants developed lung cancer. Multivariable Cox regression analysis was used to estimate the independent associations of potential risk factors with incident lung cancer. RESULTS: Older age (multivariable hazard ratio [mHR], 1.13; 95% confidence interval [CI], 1.12 to 1.14) and female sex (mHR, 1.62; 95% CI, 1.49 to 1.75) were associated with increased lung cancer risk. Current smoking was also associated with elevated risk (<10 pack-years: mHR, 1.12; 95% CI, 1.01 to 1.24; ≥10 pack-years: mHR, 1.30; 95% CI, 1.18 to 1.45), but past smoking was not. Although mild alcohol consumption (<10 g/day) was associated with lower lung cancer risk (mHR, 0.92; 95% CI, 0.86 to 0.99), heavier alcohol consumption (≥10 g/day) was not. Higher income (highest vs. lowest quartile: mHR, 0.86; 95% CI, 0.78 to 0.94), physical activity for at least 1,500 metabolic equivalent of task-min/wk (vs. non-exercisers: mHR, 0.83; 95% CI, 0.69 to 0.99) and obesity (vs. normal weight: mHR, 0.89; 95% CI, 0.83 to 0.96) were associated with lower lung cancer risk, whereas metabolic syndrome was associated with increased risk (mHR, 1.13; 95% CI, 1.03 to 1.24). CONCLUSIONS: In young adults, age, female sex, smoking, and metabolic syndrome were risk factors for early-onset lung cancer, while high income, physical activity, and obesity displayed protective effects.
Jihun Kang,Eun-Hye Kang,윤영식,지승묵,윤인식,여종석 한국현미경학회 2020 Applied microscopy Vol.50 No.1
The biocompatible polyurethane acrylate (PUA) nanopillars were fabricated by soft lithography using three different sizes of nanobeads (350, 500, and 1000 nm), and the human adipose-derived stem cells (hASCs) were cultured on the nanopillars. The hASCs and their various behaviors, such as cytoplasmic projections, migration, and morphology, were observed by high resolution images using a scanning electron microscope (SEM). With the accurate analysis by SEM for the controlled sizes of nanopillars, the deflections are observed at pillars fabricated with 350- and 500-nm nanobeads. These high-resolution images could offer crucial information to elucidate the complicated correlations between nanopillars and the cells, such as morphology and cytoplasmic projections.
Jihun Kang,Young-Shik Yun,Eun-Hye Kang,In-Sik Yun,Jong-Souk Yeo 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
Cellular traction forces (CTFs) are essential factors for various cell behaviors. However, previous studies have not completely identified the relationships between cellular traction forces and cell behaviors. Herein, human adipose-derived stem cells (hASCs) were cultured on polyurethane (PUA) nanopillars, and their interactions were observed with a scanning electron microscopy. With the analyses, the individual force of spring-like actomyosin was characterized by calculating CTFs on each nanopillar. Then, the relationships between the forces of actomyosin and cellular behaviors were proposed.
Kang, Jihun,Yu, Heonchang The Korean Institute of Communications and Informa 2018 Journal of communications and networks Vol.20 No.3
As the size of data increases and computation becomes complicated in fog computing environments, the need for high-performance computation is increasing. One of the most popular ways to improve the performance of a virtual machine (VM) is to allocate a graphic processing unit (GPU) to the VM for supporting general purpose computing on graphic processing unit (GPGPU) operations. The direct pass-through, often used for GPUs in VMs, is popular in the cloud because VMs can use the full functionality of the GPU and experience virtually no performance degradation owing to virtualization. Direct pass-through is very useful for improving the performance of VMs. However, since the GPU usage time is not considered in the VM scheduler that operates based on the central processing unit (CPU) usage time of the VM, the VM performing the GPGPU operation degrades the performance of other VMs. In this paper, we analyze the effect of the VM performing the GPGPU operation (GPGPU-intensive VM) on other VMs through experiments. Then, we propose a method to mitigate the performance degradation of other VMs by dynamically allocating the resource usage time of the VM and preventing the priority preemption of the GPGPU-intensive VM.
판누스 형성이 인공심장판막 및 주변 혈류에 미치는 영향
강지훈(Jihun Kang),김두현(Doohyeon Kim),이영진(Youngjin Lee),하호진(Hojin Ha) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Pannus formation is an important cause of complications after prosthetic heart valve replacement. The pannus formation interferes with the mechanical valve function and causes hemodynamic changes. It can disturb transvalvular blood flow and lead to valve dysfunction or stenosis that may require repeated heart surgery. The purpose of this study is to examine the effects of pannus formation and the characteristics of hemodynamic indices around the mechanical valve using a particle image velocimetry (PIV).
Gate-All-Around FET Inner Spacer 두께에 따른 Parasitic Capacitance 모델링
강지훈(Jihun Kang),김현곤(Hyeongon Kim),박하민(Hamin Park) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
According to the scaling of transistors, the impact of parasitic capacitance is continuously increasing. In the case of gate-all-around FET (GAAFET), various parasitic capacitance elements exist due to its complex three-dimensional structure. In this paper, we conducted modeling of extension capacitance (Cext) in GAAFET based on different inner spacer thickness (TIS). We extracted Cext of GAAFET using TCAD simulation and carried out Cext modeling using elliptical coordinates to the Cartesian system. To establish the model, we divided the distribution of electric fields composing Cext into three regions and ensured consistency between the models of changes in these three regions with TIS and TCAD simulation results. Finally, we analyzed the trend of C<SUB>ext</SUB> changes based on the TIS using the model.