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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.
SVC 기법을 활용한 정성적인 가정용 에어컨 고장상황 판단에 관한 연구
김동혁(Donghyuk Kim),강석경(Suk Kyung Kang),유재석(Jai Suk Yoo),김동권(Dong-Kwon Kim),윤백(Baek Youn),주영주(Youngju Joo),황준(Jun Hwang),서형준(Hyeongjoon Seo) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
여름철의 기온이 꾸준히 상승함에 따라 에어컨의 사용량도 증가하고 있다. 또한 에어컨의 사용량이 증가함에 따라 고장상황도 자주 발생하게 된다. 수리를 위해 가장 먼저 수행되어야 할 것은 고장의 원인에 대하여 파악하는 것이다. 현재 사용자들은 에어컨이 가동될 때 고장의 정도를 알지 못하고 치명적인 결함이 발생한 후에 고장상황을 인지할 수 있다. 그리고 또한 고장의 원인은 직접 알지 못한다. 따라서 고장의 원인을 판단해야 하기 때문에 수리에 소요되는 시간이 증가하게 된다. 이로 인해 사용자가 수리에 소모되는 시간동안 에어컨을 사용하지 못함으로 인하여 불편함을 느끼게 되고 이를 해결해야 할 필요가 있다. 이 문제의 개선을 위하여 본 연구에서는 머신러닝 기법중 SVC 기법을 통하여 고장 상황에 대한 정보를 정성적으로 파악하였다. 그리고 고장상황에 대한 정보를 파악함으로써 사용자의 쾌적성과 에너지 효율 향상을 추구하고자 한다.
다양한 가열조건에 따른 광열 효과를 이용한 편평세포암 사멸에 관한 수치적 연구
김동혁(Donghyuk Kim),김현정(Hyunjung Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Recently, photothermal therapy has attracted attention as an alternative treatment to conventional surgical techniques because it does not bleed out, and patients quickly recover after treatment compared to incisional surgery. Photothermal therapy is a treatment technique that induces tumor death by increasing the temperature using the photothermal effect, which converts light energy into thermal energy. This study conducted a numerical analysis based on heat transfer to induce apoptosis temperature of tumor tissue for various heating conditions in photothermal therapy. Numerical analysis using the Monte Carlo method was performed on multi-layered skin structure containing squamous cell carcinoma. Through the effective apoptosis retention ratio, numerical analysis results show the quantitative correlation for various variables. This study showed an optimal condition for maximizing apoptosis within tumor tissue while minimizing thermal damage to surrounding tissues under various heating conditions.
문명화 사명과 선교에 대한 영국인 관리들의 태도 : 19세기 중엽 인도 마드라스 관구를 중심으로
김동혁(Donghyuk Kim) 한국서양사연구회 2012 서양사연구 Vol.0 No.46
This article is to study newly the relationship between the civilization and the Christianity that British officials in Madras Presidency India attempted to spread among Indian People in the middle of the 19th century. To date, the British officials ruled colonial India have been regarded as an unique group pursued to spread civilization in India with neutral attitude. Previous studies claimed British officials and missionaries only had common interest in modernization of India as such they did not pay much attention to the religious attitude of government officials. However, those officials were not a simple group with neutral attitude. This article claims that the dual attitude of officials toward Christian mission caused opposition from Indian elite group as well as subsequent instability of the colonial empire. To support this argument, in this article an emphasis is placed on the attitude change of British officials and response of Indian elites of pre & post Indian uprising in 1857. The British were shocked at the Indian revolt, thus the policy of the government was requested to be changed. However, the officials of Madras Presidency did not change even after the Uprising in 1857. That was because the Madras Presidency in the southern region could maintain stability contrary to the Northern area that was swept by the shock of the Indian uprising. Above all, those high ranking officials in the Madras Presidency believed that the active missionary activities in this region as well as the existence of relatively higher number of Indian converts contributed to the stability of empire. Therefore, the Madras officials pursued reform persistently against the home government. After all, the civilizing mission and religious fervor of the British officials brought about tensions with Indian elites who governed Indian society, and those were expressed in the Tinnevelly and the Travancore disturbances. The grievance of Indian elites was revealed by the Madras Native Association. Madras Native Association sent a petition to the home government, in which they criticized unfair behaviors of British officials and requested immediate correction with regard to the oppression on traditional culture and the problem of educational policy. Superficially, the petition of Madras Native Association seemed not to be accepted, but in reality the changed circumstance was being accepted. Unlike to be known previously, many colonial officials believed Christianization of India was their mission, and their pro-missionary attitude served as a decisive factor that threatened the stability of Empire. It goes without saying that the officials endeavored to observe neutrality in public as government administrators, and their efforts were expressed in the name of civilizing and reform. Nevertheless, Indian elites misconstrued reforms as a strategy to christianize Indians due to officials' private support for missionaries. Finally, to analyze and understand the dual attitude of colonial officials will not only provide help in figuring out the relationship between civilizing mission of government officials and missionaries but also be useful to comprehend interrelationship between the British Empire and Christianity.
김동혁(Donghyuk Kim),이정환(Junghwan Lee),윤성의(Sung-Eui Yoon) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1
모션 플래닝 분야에서 실시간으로 주변을 감지하고 움직이는 로봇의 경우 변화하는 장애물들에 대한 동적인 감지 및 분석과 제한된 경로 계산 시간 등의 제약이 따른다. 특히 무인 자동차와 같이 제어의 제약을 고려한 충돌이 없는 유효 경로 생성은 그 자체 만으로도 중요한 이슈이다. 본 연구에서는 샘플링 기반의 알고리즘인 RRT<SUP>*</SUP> 를 이용한 무인 자동차의 경로 생성기법에 대한 연구와 실시간 경로 생성을 위해 고려되는 부가적인 요소들의 유기적인 결합에 대해 소개한다. In motion planning field, it is necessary for the mobile robots which have ability to recognize the surrounding environments and move by itself, to detect, analyze the obstacles and compute feasible trajectory in real time. Especially, in case of car-like robots which have control constraints, it is challenging to only generate a feasible trajectory in a limited time. In this paper, we extend sampling based algorithm RRT<SUP>*</SUP> for autonomous vehicle with control constraints to takes advantage of dubins path, and its simplicity for easing trajectory calculation. In addition, we show some simple collision detection technique from dubins path.