Sol-gel 법을 이용한 내오염 반사방지 코팅막 제조

김정엽,이지선,황종희,임태영,이미재,현승균,김진호,Kim, Jung-Yup,Lee, Ji-Sun,Hwang, Jonghee,Lim, Tae-Young,Lee, Mi-Jai,Hyun, Soong-Keun,Kim, Jin-Ho 한국재료학회 2014 한국재료학회지 Vol.24 No.12

Anti-reflection coating films have used to increase the transmittance of displays and enhance the efficiency of solar cells. Hydrophobic anti-reflection coating films were fabricated on a glass substrate by sol-gel method. To fabricate an anti-reflection film with a high transmittance, poly ethylene glycol (PEG) was added to tetraethyl orthosilicate (TEOS) solution. The content of PEG was changed from 1 to 4 wt% in order to control the morphology, thickness, and refractive index of the $SiO_2$ thin films. The reflectance and transmittance of both sides of the coated thin film fabricated with PEG 4 wt% solution were 0.3% and 99.4% at 500 nm wavelength. The refractive index and thickness of the thin film were n = 1.29 and d = 105 nm. Fluoro alkyl silane (FAS) was used for hydrophobic treatment on the surface of the anti-reflection thin film. The contact angle was increased from $13.2^{\circ}$ to $113.7^{\circ}$ after hydrophobic treatment.

도로터널 화재발생시 연기유동에 관한 축소모형실험 연구

김정엽,신현준,강세구,안경철,Kim, Jung-Yup,Shin, Hyun-Joon,Kang, Se-Gu,Ahn, Kyung-Chul 한국터널지하공간학회 2004 터널기술 Vol.6 No.2

도로터널내 화재가 발생한 경우 자연환기와 종류식 환기시스템에서의 연기유동에 대한 연구가 수행되었다. Froude Scaling에 기초한 1/18 축적의 축소모형실험장치가 제작되었으며, 화원으로는 연료심지를 이용한 14.55kW 규모의 연소기가 사용되었다. 화원으로부터 등비간격으로 터널천정부근과 수직방향의 온도분포가 측정되었으며, 연소가스의 농도가 피난대피구 입구에서 측정되었다. 연구결과로서 자연환기시스템에서 비상대피구가 225m 간격으로 설치되어 있을 경우 비상대피구 구간의 연기확산시간은 256초가 되며, 20MW의 화재강도에 대해 화염역류를 완전히 방지하기 위해서는 터널풍속을 2.8m/s로 형성해 주어야 한다. In this study, smoke movement in tunnel fire with natural and longitudinal ventilation systems has been investigated. Reduced-scale experiments were carried out under the Froude scaling using 14.55kW fire source with a wick and experimental data is obtained with 1/18 model tunnel test. Temperature profiles were measured under the ceiling and vertical direction along the center of the tunnel and poisonous gas was measured at emergency exit point. The results show that refuge time for 225m intervals of emergency exit in case of natural ventilation systems is 256 seconds and critical velocity for sufficient back-layer prevention is 2.8m/s for fire strength of 20MW.

터널에서 차량의 운행에 의해 생성되는 비정상 유동에 대한 실험적 연구

김정엽,신현준,Kim, Jung-Yup,Shin, Hyun-Joon 한국터널지하공간학회 2009 한국터널지하공간학회논문집 Vol.11 No.4

도로터널내 열유동장의 형성은 여러 가지 요인의 영향을 받는다. 즉 차량의 이동에 의한 피스톤 효과, 환기설비의 환기력, 자연풍 영향, 화재시 부력 등에 따라 도로터널내 기류가 형성된다. 차량의 이동에 의한 피스톤 효과는 도로터널내 기류생성의 일차적인 요인이며, 화재시 연기의 초기 거동에 영향을 줄 수 있다. 본 연구에서는 도로터널내 차량의 이동에 의해 생성되는 비정상 기류를 분석하기 위해서 단순한 형태의 터널과 차량에 대한 축소모형실험장치를 제작하고 실험을 수행하였다. 기본형, 전두부 사변형, 후두부 계단형의 3가지 형태로 차량의 형상을 변화시켜가며 차량운행에 따라 형성되는 터널내 압력과 기류속도를 측정하였다. 실험결과 터털내 생성되는 압력과 속도의 크기는 "기본형>후두부 계단형>전두부 사변형"의 순서로 증가하였다. 실험결과는 향후 3차원 수치해석 결과와의 비교, 검토를 통해서 수치해석 기술의 보완 및 신뢰성 확보를 위한 기초자료로 활용될 수 있다. The thermo-flow field in road tunnel is influenced by some facts such as piston effect of vehicle's move, operation of ventilation facilities, natural wind and buoyancy effect of fire plume. Among those, piston effect is one of primary causes for formation of air flow in road tunnel and has an effect on initial direction of smoke flow in tunnel fire. In this study to analyze the unsteady flow in the tunnel caused by the run of vehicle, the experimental study of vehicle-induced unsteady flow on a reduced-scale model tunnel is presented. While the three types of vehicle shape such as basic type of rectangular shape, diamond-head type and stair-tail type are changed, the pressure and air velocity variations with time are measured. The rising ratio of pressure and velocity are in order of "basic type of rectangular shape > stair-tail type > diamond-head type". The experimental results would be good data for development of a numerical method on the vehicle-induced unsteady tunnel flow.

지하철 정거장에서의 열차진입시 열차풍 해석

김정엽(Jung-Yup Kim),신현준(Hyun-Joon Shin),조정식(Chung-sik Cho) 대한설비공학회 2001 대한설비공학회 학술발표대회논문집 Vol.2001 No.-

인간형 로봇 플랫폼 KHR-2 의 설계 및 하드웨어 집성

김정엽(Jung-Yup Kim),박일우(Ill-Woo Park),오준호(Jun-Ho Oh) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11

In this paper, we present the mechanical, electrical system design and system integration of controllers including sensory devices of the humanoid, KHR-2 (KAIST Humanoid Robot ? 2). We have developed KHR-2 since 2003. Total number of DOF of KHR-2 is 41. Each arm including a hand has 11 DOF and each leg has 6 DOF. Head and trunk also has 6 DOF and 1 DOF respectively. In head, two CCD cameras are used for eye. To control all axes efficiently, distributed control architecture is used to reduce computation burden of main controller and to expand devices easily. So we developed the sub-controller as a servo motor controller and a sensor interfacing devices using microprocessor. The main controller attached its back communicates with sub-controllers in real-time by CAN (Controller Area Network) protocol. We used Windows XP as its OS (Operation System) for fast development of main control program and easy extension of peripheral devices. And RTX HAL extension commercial software is used to realize the real-time control in Windows XP environment.

기계식 균형 장치가 적용된 전동 휠체어의 개발

김정엽(Jung-Yup Kim) 한국생산제조학회 2013 한국생산제조시스템학회 학술발표대회 논문집 Vol.2013 No.4

보충량과 누설량을 고려한 급기가압 제연시스템의 네트워크 모델 수치해석 연구

김정엽(Jung-Yup Kim),신현준(Hyun-Joon Shin) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6

The fact that the smoke hinders evacuation and fire-fighting activities as well as becomes the major cause of life casualty emphasizes the importance of smoke control system. As one of the fire safety standards designed to secure the smoke safety, NFSC501A(Design Guide for Smoke Control System of Special Evacuation Stairwell and Lobby) has been proposed, preventing smoke from penetrating into the smoke-free escape route by raising the pressure of the smoke control zone higher than fire area. For model building of 20 stories, pressurization system was designed according to standard and pressure field of compartments in whole building induced by pressurization system was analyzed using the network model.

유압식 이족 휴머노이드 로봇의 경사면 보행 연구

김정엽(Jung-Yup Kim) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.3

This paper describes a biped walking algorithm for a hydraulic humanoid robot on inclined floors. To realize stable and robust biped walking, the walking algorithm was divided into five control strategies. The first is a joint position control strategy. This strategy is for tracking desired joint position trajectories with a gain switching. The second is a multi-model based ZMP (Zero Moment Point) control strategy for dynamic balance. The third is a walking pattern flow control strategy for smooth transition from step to step. The fourth is an ankle compliance control, which increases the dynamic stability at the moment of floor contact. The last is an upright pose control strategy for robust walking on an inclined floor. All strategies are based on simple pendulum models and include practical sensory feedback in order to implement the strategies on a physical robot. Finally, the performance of the control strategies are evaluated and verified through dynamic simulations of a hydraulic humanoid on level and inclined floors.

건축물 계단에서의 연돌효과 저감방안에 대한 3차원 수치해석 연구

김정엽(Jung-Yup Kim),김지석(Ji-Seok Kim) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.3

Stack effect on high-rise building have negative effect on living environment, energy and life-safety aspect. Thus, it’s necessary to find the measure to reduce the stack effect. As a result of field test on a 31-story building, a circulating type stack effect reduction technology was developed, which supplies air in the low stairs and discharges air in the high stairs. To evaluate the performance of this circulating type stack effect reduction technology on building stairs, a 3D numerical analysis was carried out by using Momentum Loss Model for analyzing leakage flow between compartments in a building. Consequently, numerical analysis proved that the stack effect on building stairs was reduced by a circulating type stack effect reduction technology.

건축물 구획실간 틈새에서의 누설유동에 대한 수치모델 연구

김정엽(Jung-Yup Kim),김지석(Ji-Seok Kim) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.10

1D-numerical analysis of the network algorithm with the orifice equation for the relationship between pressure difference and flowrate has been mostly used to analyse leakage flow at the gap. In this study, a 3D-numerical method applying momentum loss model to the gap region in the computational domain is represented to reflect effectively the effect of leakage flow by determining the proportion of pressure difference to air passage velocity. While the 3D-numerical method is verified through the computation of the two compartments model, the numerical analysis of the stack effect in a building stairway is performed. As the temperature of air outside drops, the pressure in the upper stairway and leakage flowrate through the gap in the door rise. The change of gap area does not have an effect on pressure in the stairway for the analysis conditions.