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상향링크의 프레임 크기와 경쟁슬롯에 따른 BWA 프로토콜의 성능평가
오성민,김재현,Oh Sung-Min,Kim Jae-Hyun 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.11B
DOCSIS and IEEE 802.16 define the usage and element of a MAP which is uplink control message. Standards does not include the details of MAP size and the number of contention slots affecting the performance of MAC protocols for DOCSIS and IEEE 802.16. In this paper, we analyzed the performance of throughput and access delay according to the MAP size and contention slot size. Based on the analytical results, we found the optimal MAP size and the number of contention slots. We found that the protocol shows best performance when the MAP size is 2msec and the number of contention slots is 8. The simulation results can apply to the network system parameters. The simulator can be used to optimize the system parameters in cable network, BWA and WiBro. DOCSIS와 IEEE 802.16 MAC 프로토콜의 MAP 메시지는 CM의 상향 채널 데이터 전송 영역을 할당하므로 프로토콜 성능에 영향을 미치게 된다. 하지만 MAP의 구성요소와 용도에 대한 정의만 표준안에 언급이 되어있고, MAP 메시지의 크기나 MAP 메시지 내의 경쟁슬롯의 수에 대한 정의는 언급되어 있지 않다. 본 논문에서는 MAP의 크기와 경쟁슬롯의 수에 따른 프로토콜의 성능을 분석하곤 분석 결과를 바탕으로 최적의 MAP 크기와 경쟁슬롯의 수를 구하였다. 실험 결과로 MAP의 크기는 2msec이고 경쟁슬롯의 수는 8개일 때 최적의 프로토콜 성능을 보임을 알 수 있었다. 본 연구의 결과는 네트워크 시스템 파라미터로 사용할 수 있으며 실험에 사용하였던 시뮬레이터는 케이블 네트워크, BWA 및 WiBro 시스템 파라미터의 최적화에 사용할 수 있다.
오성민 ( Sung-min Oh ),최지완 ( Jee-wan Choi ),박광현 ( Gwang-hyeon Park ),남하석 ( Ha-seok Nam ),이연수 ( Yeon-su Lee ),박성찬 ( Seong-chan Park ),한민우 ( Min-u Han ) 국군의무사령부 2019 대한군진의학학술지 Vol.50 No.1
Aedes albopictus(Skuse) is known as the major vector of human arboviruses that can transmit approximately 22 virus belonging to Togaviridae, Flaviviridae, Bunyaviridae families. Recently, Aedes albopictus has been suggested to be involved in the transmission of Zika virus in several countries, including Southeast Asia. In this study, Among the military units stationed in Incheon, two coastal units were selected and three inland units were selected, we used BG sentinel trap to collection mosquitoes from May to October. We have collected mosquitoes at intervals of 2 weeks and the total population of mosquito is 15,959. From among these 11,406 mosquitoes were Ae. albopictus, this accounted for 71.5% of the total mosquitoes which has greatly exceeded the national average of 23.8%. After we collected mosquitoes, we move immediately to the laboratory, classified mosquitoes and tested the pathogen in the way(1 pool contains maximum 50 mosquitoes) of a standard inspection method(Real-time PCR) by Korea Centers for Disease Control and Prevention. Although a total of 257 pools from the collected Ae. albopictus was performed. Flavivirus including Zika virus was not detected during study period. According to the study, white-rooted mosquitoes living in military areas have not yet been contaminated with pathogens such as Zikavirus.
오성민 ( Sung-min Oh ),한민수 ( Min-su Han ),권영민 ( Yeong-min Kwon ),박원서 ( Won-seo Park ),김준현 ( Jun-hyeon Kim ),신현승 ( Hyeon-seung Shin ),하상윤 ( Sang-yun Ha ),정해도 ( Hae-do Jung ) 국군의무사령부 2018 대한군진의학학술지 Vol.49 No.1
Objectives : Aedes albopictus(Skuse) is known as the major vector of human arboviruses that can transmit approximately 22 virus belonging to Togaviridae, Flaviviridae, Bunyaviridae families. Recently, Aedes albopictus has been suggested to be involved in the transmission of Zika virus in several countries, including Southeast Asia. Methods : In this study, Among the military units stationed in Incheon, two coastal units were selected and two inland units were selected, we used BG sentinel trap to collection mosquitoes from June to September. Results : We have collected mosquitoes at intervals of 2 weeks and the total population of mosquito is 7,917. From among these 1,617 mosquitoes were Ae. albopictus, this accounted for 20.4% of the total mosquitoes which has greatly exceeded the national average of 23.8%. In addition, We have collected 5,460 Cx. pipiens(69.0%), 225 Anopheles spp.(2.8%), 497 Och. koreicus(6.3%), 92 Ar. subalbatus(1.2%), 20 Ae. vexans(0.3%), 2 Cx. bitaeniorhynchus, 2 Cx. orientalis, 2 Cx. tritaeniorhynchus. After we collected mosquitoes, we move immediately to the laboratory, classified mosquitoes and tested the pathogen in the way(1 pool contains maximum 50 mosquitoes) of a standard inspection method(Real-time PCR) by Korea centers for disease control and prevention. Although a total of 50 pools from the collected Ae. albopictus was performed. Flavivirus including Zika virus was not detected during study period. Moreover, malaria inspection of Anopheles spp. 30 pools were tested and that were all negative. Conclusions : According to the study, white-rooted mosquitoes living in military areas have not yet been contaminated with pathogens such as Zikavirus, Dengue fever and yellow fever, but the high habitat density indicates that there is a risk of rapid spread if these kind of diseases are infulx from abroad. Therefore, by establishing a system to monitor mosquitoes in the military, we can use it to prepare for the outbreak of foreign infectious diseases and to improve the health of soldiers and prevent the national infectious disease.
질화갈륨 소자를 이용한 DPD용 고집적 팔렛트형 고출력증폭기 모듈 설계
오성민(Oh, Seong-Min),임종식(Lim Jong-Sik) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.5
본 논문에서는 고출력 및 고효율 특성을 지니는 질화갈륨(gallium nitride, GaN) 고출력 트랜지스터 소자를 이용하여 WiMAX 및 LTE(long term evolution) 시스템에 사용 가능한 60watt급 고출력증폭기 모듈을 팔렛트(palette) 타입으로 개발한 결과에 대하여 기술한다. 높은 이득을 얻기 위한 라인업(lineup) 구성을 위해 저전력이면서 고이득을 지니는 전치증폭단, 8watt급의 GaN 구동증폭단, 그리고 30watt급 GaN 소자 2개를 도허티(doherty) 구조로 구성한 60watt 고출력증폭단을 사용하였으며, 이로부터 2.5~2.68GHz에서 61.4dB의 이득과 ±0.075dB의 우수한 이득 평탄도를 얻었다. 특히 구동단과 고출력증폭단은 고효율 및 고출력 특성의 GaN 소자를 사용하였고, 또한 추가적인 효율 개선 을 위해 도허티 구조를 적용함으로써 보다 높은 효율을 가지도록 하였다. 현재 전 세계적으로 널리 사용되고 있는 WiMAX 신호를 사용하여 제작된 팔렛트 타입의 증폭기 모듈의 성능을 측정하였는데, RRH(remote radio head) 타입 으로 구성된 사용 예에서 WiMAX 변조 신호 10watt 출력 기준으로 약 37~38%의 효율을 나타내었다. 제작된 증폭기 모듈을 디지털 전치왜곡기(digital predistorter, DPD)와 연동하여 시험한 결과 WiMAX 변조 신호 10watt 출력에서 ACLR은 46dBc 이상의 특성을 지닌다. This paper describes the design of a palette-type 60watt high power amplifier module using gallium nitride(GaN) devices with high power and efficiency performances for WiMAX and LTE systems. The line-up for the high gain amplifier module consists of the pre-amplifier stage with low power and high gain, 8watt GaN driving amplifier stage, and 60watt GaN high power amplifier stage of Doherty structure with two 30watt GaN devices. The obtained gain is 61.4dB with an excellent gain flatness of ±0.075dB over 2.5~2.68GHz. GaN devices and the Doherty structure are adopted for the improvement of high efficiency and output power. The measurement for the fabricated high power amplifier module of palette type is performed using the widely known WiMAX signal all over the world. In the example of RRH(remote radio head) application of the fabricated amplifier module, the measured efficiency is 37~38% with the 10watts of modulated output power. It is shown that when the fabricated amplifier module is activated with a digital predistorter(DPD), the measured ACLR is better than 46dBc under the 10watts of modulated output power.
다층기판으로 구현된 마이크로스트립 선로와 결합접지구조의 초고주파 특성 및 등가회로 모델링
오성민(Oh, Seong-Min),구재진(Koo, Jae-Jin),박천선(Park, Chun-Sun),황문수(Hwang, Mun-Su),임종식(Lim Jong-Sik),안달(Ahn Dal) 한국산학기술학회 2006 한국산학기술학회논문지 Vol.7 No.6
본 논문은 다층기판으로 구현된 마이크로스트립 전송선로와 여기에 결합된 결합전지구조의 초고주파 특성 및 모델링에 대하여 기술하고 있다. 단층 마이크로스트립 전송선로와 결함접지구조를 지닌 기본형 구조에, 제 2의 유전체 층을 결함접지구조가 있는 바닥 접지면 아래에 적층하여 다층기판 속의 결함접지구조를 형성하였다. 그리고 제 2의 유전체 층의 유전율과 두께를 서로 달리해 가면서 초고주파 전송특성을 보고 추가된 유전체 층에 의한 등가회로의 변화를 등가회로 모델링을 통하여 분석하였다. 본 논문에서 제안된 방법에 따르면 적층된 제 2의 유전체 층에 의한 등가회로의 변화를 따로 확인할 수 있어서 추후 초고주파 회로에 유익하게 응용될 수 있다. In this paper, the transmission characteristics and equivalent circuit model of microstrip transmission line having defected ground structure (DGS) in multilayer substrates are described for high frequency region. In order to perform the study, the second dielectric layer is attached additionally onto the bottom(ground) plane of the basic DGS microstrip line consisted of the microstrip line and DGS. The dielectric constant and thickness of the second dielectric layer are adjusted to get various transmission characteristics and model parameters, and to analysis the effect of the second dielectric layer ultimately. According to this paper, the effect and equivalent circuits due to the attached dielectric substrate are verified separately, and this is expected to be applied to high frequency circuit design in the future.