Inverse design of the absorbing layer for detection enhancement in near-infrared range

Heo, Namjoon,Lee, Jaeyeol,Shin, Hyundo,Yoo, Jeonghoon,Kim, Daekeun The Optical Society 2013 Optics express Vol.21 No.20

Dielectric structure design for microwave cloaking considering material properties

Heo, Namjoon,Yoo, Jeonghoon American Institute of Physics 2016 JOURNAL OF APPLIED PHYSICS - Vol.119 No.1

핀틀을 적용한 듀얼 벨 노즐의 유동 특성

김정훈(Jeonghoon Kim),허준영(Junyoung Heo),하동성(Dongsung Ha) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5

핀틀을 적용한 듀얼 벨 노즐의 유동해석을 통해 유동 특성을 조사하였다. 동일한 조건의 핀틀-벨 노즐과 추력계수 및 추력을 비교하였고, 핀틀 스트로크에 따른 차이를 조사하였다. 스트로크 0 mm에서는 듀얼 벨 노즐의 추력이 벨 노즐보다 약 13.18% 높았고, 핀틀이 후진했을 때는 벨 노즐과 유사하였다. 스트로크에 따른 팽창비 변화는 박리와 천이를 통해 고도 보정을 수행하는 듀얼 벨 노즐에게 더 유리한 것으로 판단된다. Flow characteristics of dual bell nozzle with pintle were investigated. Thrust and thrust coefficient were compared with the pintle-bell nozzle of the same condition, and difference according to the pintle stroke was investigated. At stroke 0 mm, the thrust of the dual bell nozzle was about 13.18% higher than the bell nozzle, and when the pintle was backward, it was similar to the bell nozzle. The change in expansion ratio with stroke was considered to be more advantageous for a dual bell nozzle that performs altitude compensation through separation and transition.

Activation of zero-error classical capacity in low-dimensional quantum systems

Park, Jeonghoon,Heo, Jun American Physical Society 2018 Physical review. A Vol.97 No.6

Air Quality, Biomarker Levels, and Health Effects on Staff in Korean Restaurants and Pubs Before and After a Smoking Ban

Kim, Jeonghoon,Kwon, Ho-Jang,Lee, Kiyoung,Lee, Do-Hoon,Paek, Yujin,Kim, Sung-Soo,Hong, Soyoung,Lim, Wanryung,Heo, Jae-Hyeok,Kim, Kyoosang Oxford University Press 2015 NICOTINE & TOBACCO RESEARCH Vol.17 No.11

<P><B>Introduction:</B></P><P>The Korean government implemented a smoking ban at square floor area of ≥150 m<SUP>2</SUP>, rather than <150 m<SUP>2</SUP>, restaurants and pubs from July 2013. This study examined the effects of the smoking regulations in restaurants and pubs in terms of the air quality, biomarker levels and health effects on staff.</P><P><B>Methods:</B></P><P>Particulate matter smaller than 2.5 µm (PM<SUB>2.5</SUB>) was measured in 146 facilities before and 1 month after the ban. The urinary cotinine and 4-(methylnitrosamino)-1-(3-pyridyl)-1- butanol (NNAL) levels were measured in 101 staff members at 77 facilities before and 1 month after the ban. We also measured self-reported respiratory and sensory symptoms on both phases.</P><P><B>Results:</B></P><P>Of the 146 facilities, 121 facilities were included in the PM<SUB>2.5</SUB> analysis. In ≥150 m<SUP>2</SUP> pubs, the indoor PM<SUB>2.5</SUB> concentration was significantly reduced after the ban (<I>p</I> < .05). While the urinary cotinine concentrations of the staff in all facilities were not changed after the ban, the total NNAL concentrations of the staff in ≥150 m<SUP>2</SUP> pubs were significantly reduced after the ban (<I>p</I> < .05). The health effects on staff show that only sensory symptoms significantly improved in ≥150 m<SUP>2</SUP> facilities after the ban (<I>p</I> < .05).</P><P><B>Conclusions:</B></P><P>The smoking ban significantly reduced the levels of PM<SUB>2.5</SUB> and total NNAL concentrations in ≥150 m<SUP>2</SUP> pubs and improved sensory health among staff in ≥150 m<SUP>2</SUP> facilities. The results of this study can be useful in supporting an expansion of the smoking ban in all indoor places, including <150 m<SUP>2</SUP> restaurants and pubs.</P>

효과적인 암 치료 : TRAIL에 유도된 세포사멸의 효과

김영호,허정훈 고신대학교 의과대학 2010 고신대학교 의과대학 학술지 Vol.25 No.1

TRAIL (TNF-a Related Apoptosis-Inducing Ligand) is a promising anticancer agent. In fact, it induces apoptosis in cancer cells but not in most normal cells. Nevertheless, certain cancer cells are resistant to TRAIL-induced apoptosis and this could limit TRAIL’s efficiency in cancer therapy. To overcome TRAIL resistance, a combination of TRAIL with chemotherapy could be used in cancer treatment. This review describes that TRAIL-resistant tumors can be re-sensitized to TRAIL by a combination of TRAIL with chemotherapeutics. In addition, it has been shown that chemotherapeutic drugs have also been shown to enhance the induction of apoptosis by TRAIL or agonistic antibodies or overcome cell resistance to TRAIL or agonistic antibodies. Therefore, death receptors, particularly TRAIL death receptors, have emerged as an important cancer therapeutic target. This review suggests novel strategies for TRAIL resistance cancer treatment as the effective cancer therapy of TRAIL induced apoptosis in cancer cells.

적외선 피탐지를 위한 페이즈 필드법 기반의 적외선 반사층 설계

허남준,유정훈,Heo, Namjoon,Yoo, Jeonghoon 한국전산구조공학회 2015 한국전산구조공학회논문집 Vol.28 No.1

본 연구에서는 페이즈 필드법을 기반으로 하는 위상 최적설계 방법을 통하여 적외선 스텔스 효과를 위한 적외선 반사층의 설계를 진행하였다. 이를 위하여 수직으로 입사하는 적외선 파를 반사층에서 반사되어 원하는 방향으로 전파되도록 모델링을 하였다. 전파 방향에 측정 영역을 설정하여 해당 영역에서의 목적함수 값을 최대화하도록 설계가 진행되었으며, 이때 목적함수는 전자기파의 에너지 흐름을 나타내는 포인팅 벡터(Poynting vector)로 설정하였다. 페이즈 필드법 기반의 방법에서의 여러 파라미터 값들을 변경해 가며 설계 결과를 도출하였고, 목적함수 값을 최대화하는 모델을 최적 모델로 선정하였다. 선정된 최적 모델에서 gray scale을 cut-off 방법으로 제거한 경우 더 좋은 결과를 얻을 수 있었다. 또한 중적외선 영역에서의 효과를 고려하기 위하여 입사되는 파장을 바꿔가며 얻은 해석결과를 검토하였다. 본 연구의 유한요소해석 및 최적화 과정은 상용 프로그램인 COMSOL과 Matlab을 연동하여 수행하였다. In this paper, infrared reflector design targeting infrared stealth effect is presented using structural optimization based on the phase field method. The analysis model was determined to accomplish the design that an incident infrared wave was reflected to a desired direction. The design process was to maximize the objective value at the measuring domain located in a target region and the design objective was set to the Poynting vector value which represents the energy flux. Optimization results were obtained according to the variation of some parameter values related to the phase field method. The model with a maximum objective value was selected as the final optimal model. The optimal model was modified to eliminate the gray scale using the cut-off method and it confirmed improved performance. In addition, to check the desired effect in the middle wave infrared range(MWIR), the analysis was performed by changing the input wavelength. The finite element analysis and optimization process were performed by using the commercial package COMSOL combined with the Matlab programming.

페이즈 필드법을 이용한 박막형 태양전지의 광포획층 설계

허남준(Namjoon Heo),유정훈(Jeonghoon Yoo) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.9

본 연구는 페이즈 필드법 기반으로 하는 위상최적화를 이용하여 박막형 태양 전지의 광포획 구조의 반사층 설계를 목표를 하였다. 이를 위하여 입사된 빛이 설계영역인 반사층에서 반사되어 원하는 방향으로 진행하도록 하고자 하였다. 또한 같은 방법을 근적외선 영역의 반사판의 설계에 적용한 적외선 피탐지 구조의 개념 설계를 수행하였으며, 페이즈 필드법 기반의 결과와 밀도법 기반의 결과를 비교하였다. 목적함수는 에너지의 흐름을 나타내는 포인팅 벡터값의 최대화로 설정하였고, 반사된 빛의 방향을 조절하기 위하여 지정된 측정영역에서 값을 측정하였다. 본 연구의 유한요소해석 및 최적화 과정은 상용 프로그램인 COMSOL과 Matlab 프로그램을 이용하여 수행되었다. This study focused on the design of the reflecting layer of a light trapping system fora thin film solar cell using topology optimization based on the phase field method. Therefore, incident light was caused to propagate in the desired direction by reflecting it from this layer, which is the design domain. The same method was applied to the conceptual design of an infrared stealth structure in near infrared range. The results using the phase field method were compared with those using the density method. The design objective was to maximize the Poynting vector value representing the energy flux, which was measured in a measuring domain to control the reflected wave direction. A finite element analysis and optimization process were performed using the commercial package COMSOL combined with the MATLAB programming.

양자 선형 시스템 알고리즘에서 Read-Out 문제 연구

박정훈(Park Jeonghoon),허준(Heo Jun) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6

이 논문은 양자 선형 시스템 알고리즘에서 read-out 문제를 다룬다. 양자 선형 시스템 알고리즘은 방정식의 해를 양자 상태로 계산해서 각 항의 정보는 알 수 없다. 이 연구에서는 해의 각 항이 복소평면 위에서 방사형으로 분포되어 있을 때, 각각을 구분하는 방법을 제안한다. 이를 위해 주어진 방정식을 적절히 변형하고, 양자 선형 시스템 알고리즘 및 양자 진폭 추정 알고리즘을 적용하는 기법을 소개한다.

페이즈 필드법을 이용한 박막형 태양 전지의 광포획층 설계

허남준(Namjoon Heo),유정훈(Jeonghoon Yoo) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.4-2