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이중 커플드 라인을 이용한 이중 대역 적층형 미앤더 라인 안테나
정진우,서인종,이현진,임영석,Jung, Jin-Woo,Seo, In-Jong,Lee, Hyeon-Jin,Lim, Yeong-Seog 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.10
This paper presents the design simulation, implementation, and measurement of a miniaturized DCS, PCS / Satellite DMB dual-band stacked chip antenna with double coupled line for mobile communication terminals. A stacked meander is realized by using a via hole with height of 0.8 mm and a diameter of 0.35 mm to connect upper- and lower-layer meander sections for a reduction of the dimensions of the antenna. In addition the stacked meander chip antenna is extended by a double coupled-line to achieve two different radiation modes. A ratio of the first frequency and second frequency vary with the geometrical parameter of coupled lines. The fabricated antenna used FR-4 substrate with relative permittivity of 4.2. And its dimensions are $15.2{\times}7{\times}0.8mm^3$. The measured impedance bandwidth(VSRW<2) are 244 and 120 MHz at the operating frequency, respectively. 본 논문은 이동 통신 단말기에 사용되는 DCS, PCS / 위성 DMB 이중 대역에서 동작하는 이중 커플드 라인을 이용한 적층형 미앤더 칩 안테나의 설계 및 제작 측정에 관한 논문이다. 안테나의 면적을 줄이기 위한 적층형 미앤더 구조를 구현하기 위해 유전체의 윗면과 아랫면에 인쇄되어 있는 미앤더 부분을 직경 0.35 mm 그리고 높이 0.8 mm인 비아를 사용하였다. 그리고 이중 대역 동작을 위해 적층형 미앤더 구조에 이중 커플드 라인을 연결하였다. 이중 대역 동작 주파수 간 비는 커플드 라인의 구조 변수에 의해 변화된다. 제작된 안테나는 유전율이 4.2인 FR-4 기판을 사용하였고 면적은 $15.2{\times}7{\times}0.8mm^3$이다. 측정된 대역폭(VSWR<2)은 DCS, PCS 대역에서 244 MHz이고 위성 BMB 대역에서 120 MHz이다.
약선 요리의 맛과 조리방법이 고객 애호도에 미치는 영향
정진우,박봉규,Jung Jin-Woo,Park Bong-Gyu 동아시아식생활학회 2005 동아시아식생활학회지 Vol.15 No.3
This study was conducted to investigate the effect of taste and cooking method of medicinal cuisine on the customer loyalty. Self-administered questionnaires were collected from 214 customers visiting a restaurant specialized in temple cuisine in Yangsan city, Kyungnam province. Statistical data analysis was completed using SPSS program. Female respondents preferred garnish and bright color, and males preferred flavor and chewing taste as a taste of medicinal cuisine. The older respondents preferred flavor and chewing taste more than younger ones. Among cooking methods of medicinal cuisine, females preferred steaming and older respondents preferred boiling and cooking in casserole. From the regression analysis, the customer loyalty was singnificantly affected by sauce, delicious looking color, flavor, aroma, and chewy texture among taste factors and by boiling and cooking in casserole among cooking methods.
부산어묵의 품질과 브랜드가 소비자 기호도 만족에 미치는 영향
정진우,Jung, Jin-Woo 동아시아식생활학회 2007 동아시아식생활학회지 Vol.17 No.1
This study determine the influence of the quality and brand factor of fish paste on the customer preferences with the aim of promoting marine products in the Busan region and especially of expandong the base of the fish paste market. A sample survey was conducted to analyze the customers among Busan citizens who purchase fish paste. The result showed that the quality and brand factor of fish paste have a significantly positive (+) influence on the customers' preferences.
한우 체외수정란 생산을 위한 ${\alpha}$-Tocopherol 첨가와 동결 효과
정진우,손준규,최창용,서상원,최진석,조인철,한상현,강태영,강민수,김덕임,김현종,조상래,Jung, Jin-Woo,Son, Jun-Kyu,Choe, Chang-Yong,Suh, Sang-Won,Choi, Jin-Seok,Cho, In-Cheol,Han, Sang-Hyun,Kang, Tae-Young,Kang, Min-Soo,Kim, Duck-Im,Kim, Hy 한국동물번식학회 2011 Reproductive & developmental biology Vol.35 No.3
본 연구는 한우의 체외수정란 생산에서 체외성숙, 체외 배양시 배양액에 항산화제인 ${\alpha}$-Tocopherol의 첨가 농도에 따른 대조구와 처리구 난포란의 발달과 배반포 발생율 및 초자화 동결 후 생존성에 미치는 영향을 구명하고자 실험을 실시하였다. ${\alpha}$-Tocopherol 첨가 농도에 따른 분할율에서는 7~10월까지 비교한 결과, ${\alpha}$-tocopherol 200 ${\mu}M$ 첨가된 처리구가 대조구 및 타 처리구보다 높은 경향을 보였으나, 유의적 차이는 없었다. 배반포 발생율에서는 8~10월에서 ${\alpha}$-tocopherol 200 ${\mu}M$ 첨가된 처리구 $38.60{\pm}7.12%$가 대조구 및 타 처리구들보다 유의적으로 높게 (p<0.05) 나타났다. 초자화 동결 전 후의 총세포수는 ${\alpha}$-tocopherol 200 ${\mu}M$ 처리구에서 $115.80{\pm}6.61$개, $106.33{\pm}3.50$개로서, 다른 대조구 및 타 처리구보다 높은 세포수를 보였다. 월별에 따른 수정란의 배반포 발생율 및 동결 전후의 총세포수에서는 7~8월이 9~10월보다 유의적으로 높게 (p<0.05) 나타났다. The aim of this study was to evaluate the effect of ${\alpha}$-tocopherol on blastocysts development and subsequent cryosurvival of the vitrification. The ${\alpha}$-tocopherol(0, 100, 200, 400 ${\mu}M$) was added in to culture medium for the bovine embryos. The blasocysts from the ${\alpha}$-tocopherol and untreated control groups were then frozen-thawed, and their cryosurvival was assessed by in vitro culture for 48 h. There were no differences in the overall cleavage rate($56.14{\pm}4.66$, $58.18{\pm}4.70$, $62.97{\pm}6.86$ and $51.17{\pm}7.28$) among four treatment groups. However, in blastocyst development and total cell number were significantly higher in ${\alpha}$-tocopherol 200 ${\mu}M$ ($38.60{\pm}7.12$; $106.33{\pm}3.50$) to culture medium than other treatment groups($29.30{\pm}5.24$, $31.60{\pm}7.12$ and $26.37{\pm}4.18$; $101.36{\pm}5.12$, $97.27{\pm}2.87$, and $91.23{\pm}7.52$ respectively). Before and after vitrification, the total cell number and blastocyst development of embryo were significantly higher in July to August than September to October. In conclusion, addition of ${\alpha}$-tocopherol 200 ${\mu}M$ to in vitro bovine embryo culture medium was beneficial for improving embryo quality by decreasing the embryo damage blsstocysts cell number and improving the tolerance of the embryos to cryopreservation.
낮은 순방향 전압 강하와 높은 래치-업 특성을 갖는 이중-에미터 구조의 LIGBT에 관한 분석
정진우,이병석,박상조,구용서,Jung, Jin-Woo,Lee, Byung-Seok,Park, San-Cho,Koo, Yong-Seo 한국전기전자학회 2011 전기전자학회논문지 Vol.15 No.2
본 논문에서는 기존 LIGBT의 컬렉터와 에미터 사이에 추가적으로 에미터를 형성한 이중-에미터 구조의 LIGBT를 제안한다. 이중-에미터 LIGBT 구조는 추가된 에미터에 의해 향상된 래치-업 전류밀도, 순방향 전압강하와 빠른 턴-온 시간을 갖는다. 시뮬레이션 결과 이중-에미터 LIGBT 구조는 기존 LIGBT 구조보다 향상된 순방향 전압강하(1.05V), 높은 래치-업 전류($2.5{\times}10^3\;A/{\mu}m^2$), 빠른 턴-온 시간(7.4us)을 가짐을 확인 한다. In this paper, we present a novel Lateral Insulated-Gate Bipolar Transistor(LIGBT) structure. The proposed structure has extra emitter between emitter and collector of the conventional structure. The added emitter can significantly improve latch-up current densities, forward voltage drop (Vce,sat) and turn-off characteristics. From the simulation results, the proposed LIGBT has the lower forward voltage drop(1.05V), the higher latch-up current densities($2.5{\times}10^3\;A/{\mu}m^2$), and the shorter turn-off time(7.4us) than those of the conventional LIGBT.
정진우(Jin-Woo Jung),박성일(Sung-Il Park) 한국전자통신학회 2021 한국전자통신학회 논문지 Vol.16 No.3
능동위상배열안테나는 적절한 급전신호 가중치 선택에 따라 대국을 향해 주 빔을 조향할 수 있을 뿐만 아니라 간섭원 방향으로 패턴 널을 형성할 수 있다. 주 빔의 조향을 위한 급전신호 가중치는 방사소자의 위치를 기반으로 쉽게 산출할 수 있다. 그리고 패턴 널 형성을 위한 급전신호 가중치 또한 적절한 요구 방사패턴 설정과 WLSM(Weighted Least Squares Method)을 이용하면 산출할 수 있다. 그러나 일반적인 무선 통신망 환경에서 간섭원의 위치는 미인지 상황에 있다. 따라서 적응형 패턴 널 형성 기법이 필요하다. 본 논문에서는 요구 방사특성 설정에 따른 패턴 널 형성이 가능함을 확인하고, 이를 기반으로 관측 영역 기준 이진탐색 알고리즘을 이용하여 간섭원 적응형 패턴 널 형성 기법에 관하여 연구하였다. 제시된 기법을 기반으로 모의실험을 수행한 결과, 효율적으로 간섭 적응형 패턴 널 형성이 가능함을 확인하였다. An active phased array antennas can not only electrically steer the beam by controlling the weighting of the excitation signal, but can also form a pattern null in the direction of the interference source. The weight of the excitation signal to steer the main beam can be easily calculated based on the position of the radiating element. In addition, the weight of the excited signal for pattern null formation can also be calculated by setting the required radiation pattern and using WLSM(Weighted Least Squares Method). However, in a general wireless communication network environment, the location of the interference source is unknown. Therefore, an adaptive pattern null synthesis is needed. In this paper, it was confirmed that pattern null synthesis according to the required radiation characteristic was possible. And based on this, adaptive pattern null synthesis into the direction of an interference source was studied using a binary search algorithm based on observation area. As a result of conducting a simulation based on the presented technique, it was confirmed that adaptive pattern null forming into the direction of an interference is possible in efficient way.
공간자료를 활용한 멸종위기종 저어새(Platalea minor)의 적합 번식지 분석 연구
정진우 ( Jung Jin-woo ),김선령 ( Kim Sunryoung ),윤영준 ( Yoon Young-jun ),도재화 ( Tho Jae-hwa ),한영덕 ( Han Yeong-deok ),장래하 ( Jang Rae-ha ) 한국환경복원기술학회 2023 한국환경복원기술학회지 Vol.26 No.6
This study analyzed potential breeding sites for black-faced spoonbills on 70 non-breeding, uninhabited islands in Incheon, Korea, in order to suggest potential breeding sites for black-faced spoonbills, whose breeding population has recently been increasing. By comparing the environmental characteristics of breeding and non-breeding areas identified through a literature search, we developed a discriminant to identify potential breeding areas for black-faced spoonbills. Among a total of eight environmental variables(Island area, distance from land, distance to mudflat, distance to rice field, distance to sea route, depth of water, mudflat area, rice field area), the variables that influenced the selection of breeding sites for black-faced spoonbills were average water depth, tidal flat area, and paddy field area. As a result of discriminant analysis of breeding islands using these variables, the accuracy was found to be quite high at 80%. As a result of applying the developed discriminant to non-breeding islands located in the Incheon region, a total of 9 islands(Yongrando, Goseokdo, Beolyeom, Joreumseom, Goeriseom, Hambakdo, Moido, Bigajido, Ahyeom) were identified as potential breeding grounds for spoonbills. The research results can be used as basic data for future management of black-faced spoonbill breeding sites and selection of alternative habitats.