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광열치료의 열 투여량에 따른 세포 자멸사에 대한 수치적 연구
김무중(Moojoong Kim),김관택(Gwantaek Kim),김동혁(Donghyuk Kim),이희진(Heejin Kim),유재석(Jaisuk Yoo),김동권(Dong-Kwon Kim),김현정(Hyun Jung Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Photothermal therapy(PTT) is a therapy for selective ablation of the tumor by using a photothermal effect. However, in spite of using the photothermal effect, which is one of the fields of heat transfer, the research on heat transfer for photothermal therapy is insufficient. In photothermal therapy, GNPs (gold nanoparticles) are used as a photothermal enhancer to selective ablation of tumor. At this time, since the photothermal effect are different depending on the characteristics of the GNPs, and thermal and optical conditions of NIR laser, it is important to find an optimal condition suitable for selective ablation for effective photothermal therapy. In previous photothermal therapy studies, the temperature distribution in tumor tissues has been studied qualitatively. However, the correlation between the death of tumor tissue and thermal and optical conditions of NIR laser has not been quantitatively studied in terms of heat transfer. Therefore, in this study, the conditions (e.g. intensity, beam radius) of the lasers satisfying the apoptosis temperature (43℃ ~ 50℃ , which can effectively ablate tumors) were obtained for various sizes of tumor (width: 2mm ~ 10mm, depth: 0.5mm ~ 4.5mm) using numerical analysis. And quantitative analysis of the apoptosis rate of tumor tissue according to the thermal and optical conditions of photothermal therapy was performed.
원자력발전소 안전성 평가 향상을 위한 물 자연대류 검증 실험
김동혁(Donghyuk Kim),류나영(Nayoung Ryu),김만배(Man-Bae Kim),박창용(Chang-Yong Park),김정우(Jungwoo Kim) 한국가시화정보학회 2016 한국가시화정보학회지 Vol.14 No.3
The objective of the present study is to perform experiments for water filled cavity heated and cooled from the side at Ra=8.5×108. This experiment can provide validation database of the standard k-ε turbulence model for single-phase turbulent natural convection which has been regarded as one of the important phenomena in nuclear safety. For the natural convection inside a cavity, temperature and velocity were obtained by thermometry and PIV (Particle Image Velocimetry) methods. These results would be used for validation of standard k-ε turbulence model.
Offset-tuned Bilateral-side Inductively Coupled RF Coils for Preclinical MRI at 15.2 T
Soobum Kim,Han-Joong Kim,Phil Heo,Donghyuk Kim,Won Beom Jung,Kyoung-Nam Kim 한국자기학회 2020 Journal of Magnetics Vol.25 No.2
A small coverage of magnetic flux density (B₁) and its inhomogeneity are intrinsic problems of conventional surface coils. Therefore, offset-tuned bilateral-side inductively coupled radiofrequency (RF) coils have been specifically designed to overcome these problems. Herein, we proposed bilateral-sided wireless coils for improving the B1-field uniformity by simultaneously adding a supplemental secondary coil (s-coil) to the primary coil (pcoil) in the orthogonal direction. The offset-tuned frequency of the s-coil was evaluated and compared from 0 to +60 MHz with a +10 MHz interval at the Larmor frequency of the p-coil. Using mathematical EM modeling, we optimized the +60-MHz offset-tuned s-coil at 15.2 T. Thus, a combined coil configuration with p-coil of 655 MHz and two s-coils of 710 MHz was obtained. This combined coil configuration can overcome the B₁-field inhomogeneity of p-coils in 15.2 T small animal magnetic resonance scanner and can be extended to overcome the volume coil array inhomogeneity.
( Il Jin Kim ),( Donghyuk Kim ),( Byungkyu Ahn ),( Hyung Jae Lee ),( Hak Joo Kim ),( Wonho Kim ) 한국고무학회 2021 엘라스토머 및 콤포지트 Vol.56 No.1
There is an increasing demand for the rolling resistance reduction in truck bus radial (TBR) tires in the tire industry. In TBR tires, natural rubber is used as a base polymer to prevent wear and satisfy required physical properties (cut and chip). A binary filler system (silica and carbon black) is used to balance the durability of the tire and rolling resistance performance. In this study, natural rubber (NR) compounds applied with a binary filler system were manufactured at different cure temperatures for vulcanizate structure analysis. The vulcanizate structures were categorized into carbon black bound rubber, silica silane rubber network, and chemical crosslink density by sulfur. Regardless of the cure temperature, the crosslink density per unit content of carbon black had a greater effect on the properties than silica due to affinity with NR. The relationship analysis between the mechanical, viscoelastic properties with vulcanizate structure could be a guideline for manufacturing practical TBR compounds.