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차량 충돌 방지용 24㎓ 레이더 주파수대의 근거리 전파손실특성
하덕호(Deock-Ho Ha),류지열(Jee-Youl Ryu),김성운(Sung-Un Kim),최연욱(Yeon-Wook Choi) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.8
In this paper, we describe the short range propagation loss characteristic of 24㎓ frequency band used for automotive collision avoidance radar (ACAR). To investigate the radio propagation characteristic of ACAR signals, we used 24㎓ UMCW (Un-Modulated Continuous Wave) signals using by several polarized antenna combinations. To detect the accurate message data for safety guiding ACAR, we analyze and investigate the optimum receiving condition from the short range UMCW signal of the 24㎓ frequency. From the measurement analysis, it can be clearly seen that the short range UMCW signal can be encountered to multipath interference due to scattering rays from the ground plane and adjacent moving obstacles. In addition, it was also found that the received signal strength of circularly co-polarized antenna shows the most strong envelopes and best fading reduction effect.
김용표,윤동한,최운하,Kim Yong-Pyo,Yoon Dong-Han,Choi Un-Ha 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.8
In this paper, It is purposed to Develope Development of Home Automation Remote Control System using W Color touch LCD(liquid crystal display). This control remotely with remote control innovative and ergonomic design, right combination of LCD and hard buttons and its industry leading technology puts your customers at the cutting-edge of home entertainment. Remote Control for casual users is programmed automatically programmed with multiple free step macros and IR commands. Radio Frequency (RF) operation provides 50-100 inch range though walls and doors. Editor includes a vast library of IR codes for hundreds of brands and models of A/V components. This database is constantly growing with the inclusion of new devices every month. Keep your software up to date by using the Live Update feature. Rather than un-installing and re-installing the software, you download updates to the software from the internet. 본 논문은 TFT 칼라 터치 LCD(liquid crystal display)를 사용한 홈 자동화 원격 제어 시스템 개발을 제안한다. 이 혁신적이고 인간공학적인 디자인, LCD와 하드웨어 버튼의 올바른 조합을 가지고 원격 제어하며 또한 이것의 산업 선도적 기술을 홈 엔터테인먼트의 최첨단 부분을 수요자에게 공급한다. 일시적 사용자를 위한 원격제어는 다양하고 자유로운 매크로와 적외선 명령어를 가지고 자동적으로 프로그래밍 되어졌다. 라디오 주파수 명령은 50-100인치 정도의 벽 및 문을 통하여 조작되어진다. 편집기는 수많은 브랜드의 AV 관련 제품들에 대한 IR 코드에 맞게 방대한 라이브러리를 포함한다. 이 데이터베이스는 매달 새 장치 포함하여 지속적으로 추가된다. 라이브 업 데이트를 지원함으로 최신 버젼의 소프트웨어를 유지할 수 있다. 소프트웨어 제거 및 설치하는 것을 대신하여 인터넷에서 소프트웨어를 다운로드 및 업 데이트를 할 수 있다.
A CURVILINEAR EXTENSION OF IVERSEN-TSUJI'S THEOREM FOR SIMPLY CONNECTED DOMAIN
Choi, Un Haing 亞州大學校 1978 論文集 Vol.2 No.-
Let D be a simply connected domain with at least two boundary points in the complex plane, and t a boundary point of D. For a meromorphic function f(z) in D, lim sup│f(z)│as z→t is given in terms of accessible boundary points and prime ends. This gives a curvilinear extension of Iversen-Tsuji's Theorem for a simply connected domain.
On Ideals of The Topological Semifield R?
Choi, Un-Haing,Kook, Seun-Kil 弘益大學校 1981 弘大論叢 Vol.13 No.-
M. Antonovski, V. Boltyanski등에 의하여 1960년에 도입된 Topological Semifield중의 한 특별한 경우인 R의 Tichonov Product R??? 상의 ideal의 성질에 관하여 논한다.
AN APPLICATION OF THE EXTENDED IVERSEN-TSUJI THEOREM
Choi, Un-Haing Korean Society of Mathematical Education 1996 純粹 및 應用數學 Vol.3 No.2
An Application of the Extended Iversen-Tsuji Theorem As an immediate consequence of the extended Iversen-Tsuji Theorem. We have presented a result on the boundary behavior of analytic functions on a simply connected domain. It is shown that F. Bagemihl's result for the case of capacity 0 can be obtained as a special case of $\frac{1}{2}$-dimensional Hausdorff measure zero.
On a New Boundary Cluster Ste and Its Application
Choi, Un-Haing 弘益大學校 1984 弘大論叢 Vol.16 No.2
K. Noshiro의 Boundary Cluster Set의 Prime end를 이용해서 얻은 일반형을 이용하여 Meromorphic Function의 Exceptional Value와 Asymptotic Value에 관한 성질을 고찰한다.
Choi, Hae Young,Mudhana, Gopinath,Park, Kwan Seob,Paek, Un-Chul,Lee, Byeong Ha The Optical Society 2010 Optics express Vol.18 No.1
<P>We propose and demonstrate a cross-talk free simultaneous measurement system for temperature and external refractive index (ERI) implemented by dual-cavity Fabry-Perot (FP) fiber interferometer. The sensing probe consists of two cascaded FP cavities formed with a short piece of multimode fiber (MMF) and a micro-air-gap made of hollow core fiber (HOF). The fabricated sensor head was ultra-compact; the total length of the sensing part was less than 600 mum. Since the reflection spectrum of the composite FP structures is given by the superposition of each cavity spectrum, the spectrum measured in the wavelength domain was analyzed in the Fourier or spatial frequency domain. The experimental results showed that temperature could be determined independently from the spatial frequency shift without being affected by the ERI, while the ERI could be also measured solely by monitoring the intensity variation in the spatial frequency spectrum. The ERI and the temperature sensitivities were approximately 16 dB/RIU for the 1.33-1.45 index range, and 8.9 nm/ degrees C at low temperature and 14.6 nm/ degrees C at high temperature, respectively. In addition, it is also demonstrated that the proposed dual-cavity FP sensor has potential for compensating any power fluctuation that might happen in the input light source.</P>
On Asymptotic Values of Meromorphic Functions
Choi, Un-Haing 弘益大學校 1983 弘大論叢 Vol.15 No.2
Universal Covering Surface의 方法을 利用하여 適切한 條件을 만족하는 α가 ζ??의 근방에서 有理型函數 f(z)의 除外値이면, α는 ζ??에서 f(z)의 漸近値이거나, ζ??로 수렴하는 ??D상의 點의 數列 ζ??이 存在하여 각 ζ??에서 α가 f(z)의 漸近値가 됨을 증명한다.