The Error Performance Analysis for FH / MFSK of Mobile Robot`s Wireless Communication

Jeung Uk Ha,Byung Su Kim,Eung Hyuk Lee,Gyu Shik Che,Won Seok Chang,Seung Hong Hong 대한전자공학회 1995 JTC-CSCC : Joint Technical Conference on Circuits Vol.- No.-

An integrated packaging antenna-diplexer module for cellular/SDMB bands with LTCC technology

Ha, Jeung Uk,Chang, Kihun,Yoon, Young Joong Wiley Subscription Services, Inc., A Wiley Company 2009 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.51 No.4

<P>This article presents an integrated packaging antenna-diplexer module for wireless communication system in the cellular and satellite digital multimedia broadcasting (SDMB) band. Multilayer low temperature cofired ceramic (LTCC) technology with integration capability was used in design and fabrication of the proposed module. To achieve a compact integration, an inverted-F antenna (IFA) with a meander line and a diplexer composed of low-pass filter (LPF) and high-pass filter (HPF) was embedded. The proposed module with dimension of 27.5 × 12.0 × 2.2 mm<SUP>3</SUP> operates over a range from 813 to 902 MHz for the cellular band and from 2586 to 2655 MHz for the SDMB band. An isolation level below −25 dB was obtained at each band. The measured gains of the fabricated module are −1.96 and −5.43 dBi, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1039–1043, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24244</P>

GSM 휴대폰 TDMA 잡음 전달 특성 분석을 통한 통화 품질 개선에 관한 연구

하정욱(Jeung-Uk Ha),오태훈(Tae-Hoon Oh),강진석(Jin-Seok Kang),윤영중(Young-Joong Yoon) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.4

본 논문에서는 GSM(Global System for Mobile communication) 휴대폰에서 TDMA(Time Division Multiple Access)잡음의 원인 및 TDMA 잡음원의 판별 방법에 대해서 기술한다. TDMA 잡음의 원인은 RF(Radio Frequency)에너지 결합과 버스트 리플(Burst ripple)에 의한 저주파 에너지 결합으로 구성된다. TDMA 잡음원의 판별 방법을 출력(TDMA 잡음 측정)과 시스템(오디오 경로)의 주파수 응답을 통해 제안한다. 특히 RF 에너지 결합에 대해 삽입 손실(S21) 분석 방법과 개선 방법을 제안한다. RF 에너지 결합을 줄이기 위해 커패시터(40 pF)가 해결법이고, 결과적으로 TDMA 잡음이 10 ㏈가 줄어들었다. In this paper, we describe the cause of TDMA noise and distinction method of TDMA noise source in a GSM mobile phone. The causes of TDMA noise are composed of RF(Radio Frequency) energy coupling and low frequency energy coupling by burst ripple. We propose the distinction method of TDMA noise source from output(TDMA noise measurement) and frequency response of a system(audio path). Especially we propose a method of insertion loss(S21) analysis and the improvement method for RF energy coupling. Capacitor(40 pF) is a solution to reduce RF energy coupling and therefore TDMA noise was reduced by 10 ㏈.

원자력 발전소 환경에서의 이동 로보트 무선 통신 기법

하정욱(Jeung-Uk Ha),문철홍(Cheol-Hong Moon),장원석(Won-Seok Chang),홍승홍(Seung-Hong Hong) 대한전자공학회 1995 대한전자공학회 학술대회 Vol.1995 No.6

Effect of interferon-γ on the fusion of mononuclear osteoclasts into bone-resorbing osteoclasts

( Jeung Woo Kim ),( Myeung Su Lee ),( Chang Hoon Lee ),( Ha Young Kim ),( Soo Uk Chae ),( Han Bok Kwak ),( Jae Min Oh ) 생화학분자생물학회 2012 BMB Reports Vol.45 No.5

Osteoclasts are multinucleated cells that are formed by the fusion of pre-fusion osteoclasts (pOCs). The fusion of pOCs is known to be important for osteoclastic bone resorption. Here, we examined the effect of IFN-γ on the fusion of pOCs. IFN-γ greatly increased the fusion of pOCs in a dose-dependent manner. Furthermore, IFN-γ induced pOC fusion even in hydroxyapatite- coated plates used as a substitute for bone. The resorption area of pOCs stimulated with IFN-γ was significantly higher than that of the control cells. IFN-γ induced the expression of dendritic cell-specific transmembrane protein (DC-STAMP), which is responsible for the fusion of pOCs. IFN-γ enhanced DC-STAMP expression in a dose-dependent manner. The mRNA expression of c-Fos and nuclear factor of activated T cells (NFAT) c1 was enhanced in the pOCs treated with IFN-γ. Taken together, these results provide a new insight into the novel role of IFN-γ on the fusion of pOCs. [BMB reports 2012; 45(5): 281-286]

A Study on the electrical characteristics of a short-channel GaAs MESFET using a new linearly-graded depletion edge approximation

Park,Jeung-Uk,Suh,Chung-Ha Research Institute for Science & Technology HONG- 1999 Hongik Journal of Science and Technology Vol.3 No.-

In this paper, the current-voltage electrical characteristics of an n-type short-channel GaAs MESFET device has been analyzed by solving the two dimensional Poisson's equation, where the linearly-graded depletion edge approximation was employed in the depletion region. In this model, the expressions for the threshold voltage, the source and the drain ohmic resistance, and the drain current were derived. As a result, the Early effect in the current-voltage characteristic curve which is the typical characteristic of a short-channel device was shown and the ohmic voltage drop by source and drain contact resistances could be explained. In addition, this model could analyze both the short-channel device and the long-channel device in a unified manner.

19세기 아트 포스터에 나타난 동양회화의 영향

강민정 ( Kang Min Jeung ),하종욱 ( Ha Jong Uk ),김주형 ( Kim Joo Hyung ) 한국디자인트렌드학회 2013 한국디자인포럼 Vol.40 No.-

19세기의 아트 포스터는 산업화에 따른 새로운 조형양식의 필요성이 대두되던 시대적 배경을 바탕으로 발달하였다. 대량 커뮤니케이션 수단에 대한 요구와 석판인쇄의 발달은 아트 포스터 디자인이 활성화될 수 있는 계기를 마련해주었다. 특히 산업화 과정에서 생성된 예술과 디자인의 영역에 관한 문제에 있어 화폭을 거리로 이동시켜 예술이 대중이 쉽게 접할 수 있는 디자인의 영역으로 이동해가는 다리 역할을 했다. 따라서 아트 포스터는 현대적 의미의 디자인이 형성되는 초기의 모습을 단면적으로 보여준다. 아트 포스터는 당시의 예술과 디자인의 양식적 특성을 고스란히 지니고 있다. 회화와 디자인 영역은 근대성에 대한 문제 해결을 위해 역사주의적 사고에서 벗어나 새로운 조형 방식을 갈구하고 있었으며, 그 해결책의 하나로 동양의 조형방식을 적극 수용했다. `시누아즈리(Chinoiserie)`에서부터 `자포니즘(Japonism)`에 이르기까지 동양의 회화는 근대 회화와 디자인의 조형 방식에 큰 영향을 미쳤으며, 아트 포스터에도 이러한 특성이 여실히 드러난다. 동양의 회화는 서양의 표현방법과는 다르게 선, 여백과 생략, 평면적 특성이 두드러지며 이러한 조형방식은 동양의 전통사상인 불교, 도교, 유교의 미적 개념에서 비롯된 것이다. 본 연구는 이러한 동양회회의 특성을 기준으로 19세기 아트 포스터 대표 작가들의 작품을 분석하였다. 그 결과 19세기 아트 포스터에서 동양회화의 특성인 선, 여백과 생략, 평면적 특성의 영향을 발견할 수 있었다. 이처럼 디자인의 형성에 있어 동양의 영향은 단순한 유행이 아닌 새로운 조형 방식에 영향을 준 문화 요소인 것이다. The art posters of the 19th century were developed based on the background of the times when the necessities of new formative styles were rising in accordance with industrialization. The demand for massive communication and the development of lithography provided a chance in which design of art posters could be vitalized. Especially when a canvas was moved to the street in regard of design and art formed in the process of industrialization, the art became a design area that could be easily accessed by the public. Therefore art posters directly show the initial period when design of the modern meaning was formed. Art posters keep the stylistic characteristics of art and design of those days in full. The area of paintings and design was longing for new formative methods to solve problems related to modernity as getting out of thinking based on historicism, and the Oriental formative method was actively accepted as one of those solutions. From `Chinoiserie` to `Japonism`, Oriental paintings had huge influence on modern paintings and formative methods of design, which is also fully shown in art posters. Contrary to the Western expression methods, the Oriental paintings show noticeable characteristics like lines, empty space, omission and flat surface. Such formative methods are originated from aesthetic concepts of Buddhism, Taoism and Confucianism which are the Oriental traditional thoughts. This study analyzed the 19th century works of Art poster artists based on the characteristics of these Oriental painting. As a result, it can be found in the 19th century works of Art poster that there are the effects of the line, empty space, omissions, flat surface characteristics in Oriental paintings. Like this, the influence of the Orient is not just a simple trend, but a cultural element that has influence on new formative methods in the aspect of formation of design.

LTCC 공법을 사용한 Cellular/SDMB 안테나-다이플렉서 모듈

하정욱,장기훈,윤영중,Ha, Jeung-Uk,Chang, Ki-Hun,Yoon, Young-Joong 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.7

본 논문은 Cellular 대역과 SDMB(Satellite Digital Multimedia Broadcasting) 대역에서 동작하는 무선 통신 시스템을 위한 송수신 전치단의 소형 안테나-다이플렉서 모듈을 설계하고 구현하는 방법을 제안한다. 제안된 모듈은 이중 공진 안테나와 다이플렉서로 구성되고, 저 손실과 소형화를 동시에 달성하기 위해 다층의 LTCC(Low Temperature Co-fired Ceramic) 기술을 이용하여 제작되었다. 이중 공진 안테나는 소형화를 위해 미앤더 라인을 사용하였고, 임피던스 매칭을 쉽게 이루기 위해 IFA(Inverted-F Antenna) 구조를 응용하여 설계하였으며, 간단한 구조를 지니면서 사양을 만족하는 이득과 대역폭을 갖는다. 다이플렉서는 저역 통과 필터 및 고역 통과 필터를 결합하여 설계되었고, 이들 사이의 상호 간섭을 줄임으로써 높은 격리도를 얻을 수 있었다. 제작된 모듈의 크기는 $27.5{\times}12.0{\times}2.2mm$이고, $813{\sim}902MHz,\;2,586{\sim}2,655MHz$의 동작 주파수 대역과 -1.96 dBi(cellular band), -5.43 dBi(SDMB band)의 이득이 측정되었다. 주파수 응답 특성과 방사 특성이 분석되었다. This paper presents an integrated packaging antenna-diplexer module for wireless communication systems in the Cellular and SDMB band. The design and the realization of the proposed one are experimentally analyzed and discussed. It consists of a dual-resonance antenna and a diplexer with a multi-layer LTCC(${\varepsilon}_r=7.8,\;tan\;{\delta}=0.0043$) technology with integration capability and low loss. The dual-resonance antenna of the proposed module has the meander line structure for size reduction and has the shorting structure of an inverted F antenna to achieve good impedance matching. The diplexer of the proposed module was designed with the combination of low pass filter(LPF) and high pass filter(HPF). Decreasing the mutual interference between them provides a high isolation characteristic. The proposed antenna-diplexer module with dimensions of $27.5{\times}12.0{\times}2.2mm$ operates within a range from 813 MHz to 902 MHz for the cellular band and from 2,586 MHz to 2,655 MHz for the SDMB band. And the measured gain of the fabricated module is -1.96 dBi for Cellular band and -5.43 dBi for SDMB band. The parameters for the antenna-diplexer module are investigated and the several performances are discussed.

LETTER TO THE EDITOR : Metastatic sarcomatoid carcinoma presenting as a pedunculated mass on the floor of the mouth

( Ki Bum Won ),( Jun Hwa Song ),( Jeung Woo Lee ),( Won Chul Ha ),( Keon Uk Park ) 대한내과학회 2015 The Korean Journal of Internal Medicine Vol.30 No.4

보존적 요법으로 치유된 자궁경관 임신 2예

김흥로,김평국,하병욱,김태균,곽정상,곽태로 침례병원 1998 浸禮病院學術誌 Vol.14 No.-