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조성식(Sung-sik Jo),주양로(Yang-ro Ju),임태균(Tae-Kyun Lim),장은실(Eun-sil Jang),김훈(Hun Kim),김갑기,Hang-Man Han 한국항해항만학회 2010 한국항해항만학회 학술대회논문집 Vol.2010 No.춘계
본 논문에서는 선박내 무선통신용 장비로 활용 가능한 대역인 TRS(Trunked Radio System), WLAN(Wireless LAN), DMB(Digital Multimedia Broadcasting) 삼중대역을 위한 평면 모노폴 소형 마이크로스트립 안테나를 설계하였다. 설계되어진 안테나는 접지면과 패치면을 동일면상에 위치시키는 CPW(Co-planar Waveguide)급전 구조를 이용하여 크기를 소형화하였다. 제안된 안테나는 유전율이 4.4, 두께 1.5mm, 탄젠트 손실이 0.04인 FR-4 기판을 이용하였으며, 삼중대역에서 2이하의 정재파비를 만족하고 -10dB이하의 만족할 만한 입력대비 반사손실을 얻었다. In this paper, the tri-band planar monopole microstrip antenna which stimulaneously meets the three bands such as TRS, WLAN and DMB is designed. The designed antenna size was smaller using CPW-fed structure that shows a ground-plane and a patch-plane are existed at one layer. The proposed antenna is designed on FR-4 substrate with a relative dielectric constant 4.3, thickness of 1.5mm tangent loss 0.04. The designed antenna shows that VSWR is below 2 and has good return loss below -10dB over the three bandwidths.
조성식(Sung-sik Jo),임태균(Tae-kyun Lim),박정아(Jung-ah Park),김갑기(Kab-ki Kim) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
본 논문에서는 연방 통신위원회의 UWB(Ultra-wideband)주파수 대역(3.1~10.6[㎓])을 만족하는 새로운 디스크 모노폴 안테나를 설계하였다. 제안된 안테나는 광대역화를 위해 원형 패치 안에 직사각형 슬롯을 삽입하였으며, 부분 접지기법을 이용하여 후면 방사에 대한 간섭을 줄였다. 제안된 안테나는 유전율이 4.4, 두께가 2㎜인 FR-4 기판으로 설계하였으며, UWB 전대역에서 2이하의 VSWR을 만족하였고 -10㏈ 이하의 양호한 반사 손실을 나타내었다. In this paper, a novel Disc monopole antenna is designed satisfying UWB(Ultra-wideband) frequency bandwidth(3.1~10.6[㎓]) of FCC(Federal Communication Commission). The proposed antenna of UWB application consists of putting circular patch on a FR-4 substrate with digging rectangular slot on circular patch and obtained to decrease the back radiation by a partial ground plane for extending bandwidth. The proposed antenna is designed on FR-4 substrate with a relative dielectric constant 4.4 and thickness of 2㎜. The designed antenna shows that VSWR is below 2 and has good return loss below -10㏈ over the bandwidth.
민정상(Jung Sang Min),조성식(Sung Sik Jo),이봉근(Bong Geun Lee),명노해(Rohae Myung),이덕희(Duck Hee Lee) 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.5
This study was conducted to show the occurrence of negative transfer through various keypad systems on mobile phones when a user switches to a new system. This negative transfer applied to the text-based entry systems of mobile phones. Therefore, we verified the negative transfer in a text entry system while considering the characteristics of three types of keypad that are used in the Korean mobile phone market. The transfer of learning also verified amount of though compare and analysis of GOMS production system. Also, the result of the analysis about the amount of memory that is needed for all spellings in each interface is in this context. The form of memory and the most general interface are shown from results. Hence, this study helps to put forward a theoretical background to support the proof definite phenomenon of transfer through GOMS model and develop a very compatible interface.
김훈(Hun Kim),조성식(Sung-sik Jo),임태균(Tai-gyun Lim),장은실(Eun-sil Jang),박세필(Sei-fil Park),김갑기(Kab-ki Kim) 한국정보기술학회 2010 Proceedings of KIIT Conference Vol.2010 No.-
본 논문에서는 FCC(연방 통신위원회)에서 지정한 UWB(Ultra-wideband) 주파수 대역(3.1~10.6㎓)을 만족하는 UWB 원형 슬롯 패지 안테나를 설계하였다. 제안된 안테나는 광대역화를 위해 원형 패치 안에 반원형 슬롯을 삽입하였으며, 후면 방사에 대한 간섭을 줄이기 위해 부분접지를 이용하였다. 유전율은 4.4, 두께가 2㎜, 손실이 없는 FR-4 기판으로 설계하였다. 시뮬레이션 결과 -10㏈이하에서 양호한 반사손실을 가졌고, UWB 전대역에서 VSWR 2이하를 만족하였다. In this paper a circular slot patch antenna is designed satisfying UWB(Ultra-wideband) frequency(3.1~10.6) in FCC(Federal Communication). The proposed antenna inserted semi-circular slot for wide-band and obtained to decrease the back radiation by a partial ground plane for extending bandwidth. The substrate is desinged on loss-free FR-4 with relative dielectric constant 4.4 and thickness 2㎜. Simulations show that has good retuen loss below -10 ㏈ over the bandwidth and has good VSWR(2:1).
도시철도 역무실 통합 안전관리시스템 디스플레이의 Ecological Interface Design Prototype 개발
이봉근(Bong Geun Lee),백지승(Ji Seung Back),조성식(Sung Sik Jo),명노해(Rohae Myung),이덕희(Duck Hee Lee) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.4
Current subway station's office employee must perform safety management tasks by monitoring the various safety management systems. But these monitoring systems are limited in effective situational awareness and response to a state of emergency immediately. It is necessary to develop an integrated safety management system display. In this study, we developed subway station safety management system's (CCTV, fire detection & alarm system, screen door control equipment) integrated prototype display with ecological interface design framework and evaluated prototype display interface's usability with GOMS model. The result was that the ecological interface's performance was better than existing safety management system's interface.
도시철도 역무실 통합 안전관리시스템 디스플레이의 Ecological Interface Design Prototype 개발 (pp.202-206)
이봉근(Bong Geun Lee),백지승(Ji Seung Back),조성식(Sung Sik Jo),명노해(Rohae Myung),이덕희(Duck Hee Lee) 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.5
Current subway station's office employee must perform safety management tasks by monitoring the various safety management systems. But these monitoring systems are limited in effective situational awareness and response to a state of emergency immediately. It is necessary to develop an integrated safety management system display. In this study, we developed subway station safety management system’s (CCTV, fire detection & alarm system, screen door control equipment) integrated prototype display with ecological interface design framework and evaluated prototype display interface’s usability with GOMS model. The result was that the ecological interface’s performance was better than existing safety management system’s interface.