http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
자유공간 기법을 적응한 마이크로파 대역 전파흡수재의 유전 특성 분석
배근식 한국군사과학기술학회 2003 한국군사과학기술학회지 Vol.6 No.2
For measurements and analysis of dielectric characteristics of planar slabs of microwave absorbing materials, I have applied a free-space method in the frequency range of 8~14 GHz. The measurement system for free-space method consists of transmit and receive antennas, mode transitions, precision coaxal cables, the network analyzer, and a computer Special Spot-focused horn lens antenna was used to eliminate diffraction effects. Diffraction effects at the edges of the sample are minimized by satisfying the condition for minimum transverse dimension of the plate and the beamwidth of the antennas at the focus. The time-domain gating feature of the network analyzer and the thru, reflect, and line(TRL) calibration technique were used to eliminate the effects of undesirable multiple reflections. The complex coefficients of reflection and transmission, $S_{11}$ and $S_{21}$, of planar samples were measured for standard materials such as Teflon, Rexolite$\textregistered$ 2200. The results were compared with existing measurement method. And I applied a free-space method for measurement to measure dielectric constants of some electromagnetic absorbing materials. Dielectric properties for the same samples were also measured with a 7mm coxial transmission line method for purposes of comparison with the free-space method.
디젤엔진 연소실 벽면에서의 정상 및 비정상 열전달 해석
박정규,배근식 건국대학교 산업기술연구원 1999 건국기술연구논문지 Vol.24 No.-
A global, systems-level model which characterizes the thermal behavior of internal combustion engines is described in this paper. Based on resistor-capacitor thermal networks, either steady-state or transient thermal simulations can be performed. A diesel engine cycle simulation is used to determine the in-cylinder gas temperature and convection coefficients. Overall system predictions are validated with data from a single cylinder DI diesel engine. It has been shown that the model is a powerful tool in predicting steady-state heat rejection and component temperature as well as transient component temperature.
배근식(K.S.Bae),박정규(J.K.Park),유천(C.Yoo) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
A mathmatical model is developed to study the transient behavior of a four-stroke, single cyliner and multi cylinder, DI diesel engine during cranking and starting. The model consists of physically-based first-order nonlinear differential equations and some algebraic equations describing engine dynamics, battery discharge and starter motor dynamics. The model simulates the full thermodynamic cycle of the cngine and includes detailed sub-models for intake and exhaust gas flow processes, autoignition combustion, heat transfer, mechanical friction, blowby, and engine dynamics. It can serve as a tool for computer-aided control systeme design to improve vehicle performance.<br/>
디젤 엔진 저온 시동 시스템 최적화를 위한 엔진 시동 과정의 동적 모델링 및 시뮬레이션
박정규(Jungkyu Park),배근식(Keunsik Bae),유천(Chen Yoo) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.1
To optimize the cold start process of a 4-stroke, 8 cylinder Diesel engine, a dynamic simulation model from cranking to idle speed is developed. Physically-based first order nonlinear differential equations and some algebraic equations describing engine dynamics and starter motor dynamics are used to model the performance of starting process which is very complex. These equations are solved using numerical schemes(Petzold-Gear BDF method) to describe the starting process of diesel engine and to study the effects of starting parameters. The validity of this model is examined by start test. This model can be served as a tool for computer aided control systems design to improve cold start performance.
앞먹임 Image-Based Visual Servoing을 이용한 함상 자동 착륙
조강익(Gangik Cho),최준원(Joonwon Choi),배근식(Geunsik Bae),오현동(Hyondong Oh) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.6
무인비행이동체 (UAVs)의 자율 임무 수행에 있어 자동 착륙은 필수적이다. 특히 함상과 같이 좁고 빠르게 이동하는 목표물에 착륙하기 위해서는 일반적으로 UAV에 사용되는 Global positioning system (GPS)와 같은 정밀도가 낮은 센서를 이용하는 것은 불가능하다. 본 연구에서는 GPS의 낮은 정밀도를 보완하기 위해 영상을 이용한 방법 중 하나인 Image-based visual servoing (IBVS)를 이용한 자동 착륙 방법을 소개한다. 또, 빠르게 전진하는 배의 속도를 보정하기 위해 배에 부착된 GPS를 이용하여 배의 속도를 추정하고 이를 더해주는 앞먹임 IBVS를 소개한다. Autonomous landing are essential for autonomous missions of unmanned aerial vehicles (UAVs). In particular, in order to land on a small and moving fast target such as a ship, it is impossible to use a low-precision sensor such as Global Positioning System (GPS), which is generally used in UAVs. In this study, an autonomous landing method using Image-based visual servoing (IBVS), which is one of the visual control methods to replace GPS with low precision, is introduced. In addition, in order to compensate the velocity of a fast moving forward ship, feed-forward IBVS, which estimates the velocity of the ship using GPS attached on the ship and adds the its velocity as feed-forward term to control scheme is introduced.