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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.
이중구조를 이용한 역방향 광열편향법의 수치해석 유효성에 대한 연구
김관택(Gwan-taek Kim),김무중(Moojoong Kim),이희진(Heejin Lee),김현정(Hyunjung Kim),유재석(Jaisuk Yoo) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Among the non-contact thermal property measurement techniques, a method utilizing the photothermal effect has been verified for their reliability by many researchers. Among them, the photothermal displacement method, the photothermal deflection method, and the photothermal deflection dollinear method are the most recently proposed thermal property measurement techniques. However, the thermal properties measurement technique previously discussed has various limitations for the measurement, depending on the characteristics of the materials such as absorption and transparency. Therefore, a universal thermal property measurement technique is needed. In this paper, we build a numerical model for reverse photothermal deflection method. In order to validate the numerical model, the grid dependence was verified and the optimum number of grids was obtained. From the comparison of the analytical analysis and the numerical results shows about 0.1% difference each other.
금속-수지 이중층 구조에서의 광열편향법을 이용한 금속 두께측정에 대한 수치해석적 연구
이희진(Heejin Lee),김무중(Moojoong Kim),김관택(Gwan-taek Kim),유재석(Jaisuk Yoo),김현정(Hyunjung Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In this study, the thickness for first layer of metal-resin double layer materials is measured using photothermal deflection method. While the modulated pump beam is irradiating on material, the periodic temperature distribution changes occur in the material due to photothermal effect. The periodic temperature distribution depends on the effective thermal diffusion coefficient in the range of thermal wave influence inside the material. According to the thickness for first layer, the effective thermal diffusion coefficient will be changed, which results in phase change of probe beam. Based on these phenomena, the profiles of phase change according to the various thickness for first layer for five-step of frequency were obtained using numerical analysis. Also, numerical results were non-dimensionalized. It can be identified that the phase profiles have the same tendency regardless of frequency changes if the dimensional parameter is identical. As a result, the thickness for first layer can be determined by the frequency of pump beam and the phase delay of probe beam.