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미래 IEEE 802.11 LRLP 통신을 위한 효율적인 다중 사용자 자원할당 기법
안우진 ( Woo Jin Ahn ),김용호 ( Ronny Yongho Kim ) 한국항행학회 2016 韓國航行學會論文誌 Vol.20 No.3
무선랜의 가능한 미래 통신 표준으로 진행 중인 IEEE 802.11 LRLP는 사물 인터넷 (IoT) 네트워크 표준을 목표로, 드론을 포함한 사물 통신 단말들의 장거리 (long range) 통신과 저전력 동작 (low power)을 지원한다. 본 논문에서는 IEEE 802.11 LRLP 환경에서 다수의 단말들의 다중 사용자 상향 통신을 위한 자원 할당 기법을 제안한다. IEEE 802.11ax의 OFDMA 임의 접근 (random access)에 기반한 제안하는 기법에서는, AP (access point)가 성공적으로 전송받은 데이터의 크기를 기반으로 다음 차수의 임의 접근 유도를 위한 자원의 크기를 적응적으로 결정하여, 접속 단말이 최적의 크기의 자원을 선택하여 접속할 수 있도록 한다. 본 논문의 시뮬레이션 결과에 따르면 제안하는 기법은 종래의 임의 접근 기반 통신 기술의 시스템 처리율(throughput)을 크게 향상시키는 것으로 나타났다. As a possible standardization of wireless local area network (WLAN), IEEE 802.11 LRLP is under discussion in order to support long range and low power (LRLP) communication for internet of things (IoT) including drones and many other IoT devices. In this paper, an efficient adaptive resource unit allocation scheme for uplink multiuser transmission in IEEE 802.11 LRLP networks is proposed. In the proposed scheme, which adopts OFDMA random access based transmission scheme of IEEE 802.11ax, in order to enhance the efficiency of the slotted OFDMA random access, access point (AP) traces the history of the sizes of successfully transmitted uplink data, and adjusts the sizes of resource units for the next uplink multiuser transmission adaptively. Our simulation results corroborate that the proposed scheme significantly improves the system throughput.
현대미술관에서 신체이동에 의한 공간시퀀스구조에 관한 연구
안우진(Ahn.Woo-Jin),고성룡(Koh.Seong-Lyong) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The purpose of this study is to analyze the structure of the space sequences in the Contemporary art museums according to the experience of the human body. the space sequence emphasizing the visual experience, and the complex sequence of the space of the human body and views. The results of the analysis are following. (l)The sequence of space emphasizing the experience of the human body represented in the art museum composed organic space. The sequence of space is not perceived by the range of views available. (2)The sequence of space emphasizing the visual experience emphasize the form of space and area, because the order of art museum is composed of a geometrical form. (3)The complex sequence of the space of the human body and views is realized in the art museum as the fused the environment and spaces of building, thus a building and its surrounding environment are emphasized in the course of approach.<br/> <br/> <br/> <br/> <br/>
비행체 무선 센서망을 위한 무선랜 OFDMA 임의접근 기반 통신
안우진 ( Woo Jin Ahn ),김용호 ( Ronny Yongho Kim ) 한국항행학회 2016 韓國航行學會論文誌 Vol.20 No.3
본 논문에서는 IEEE 802.11ax에서 제안하는 임의 접근 기술을 이용한 무선랜 기반 센서 네트워크의 접속 기법을 제안한다. 제안하는 기법은 상향 데이터를 가지고 있는 예비 접속 단말들에 대하여 접속, 대기, 포기의 세 구간으로 나누어진 정수 단위의OFDMA BackOFF counter (OBO)를 임의로 선택하게 하여 센서 단말의 실질적인 접속을 제어할 수 있다. 제안하는 기법은 비행기등과 같이 다수의 센서와 연결이 필요한 센서 네트워크에 효과적으로 사용할 수 있다. 제안하는 방법을 사용하면, 기체내의 센서들은 본 논문에서 제안한 차등 OBO 매개변수를 사용한 접속 방법에 따라 접속을 시도하여 접속 용량을 초과하는 수의 단말을 효과적으로 제어할 수 있다. 또한 본 논문은 제안하는 기법에서 최적의 효율을 얻기 위한 관련 파라미터들에 대한 수학적 분석을 함께 제공한다. 본 논문의 분석 결과에 따르면 제안하는 기법을 통해 다수의 센서들의 접속이 최적의 효율에 가깝게 관리되었다. In this paper a novel access scheme for uplink multiuser transmission based on IEEE 802.11ax random access in in-aircraft wireless sensor networks is proposed. The proposed scheme provides an efficient access control mechanism with three divisions of OFDMA backoff counter (OBO): access, deferring, dropping, which controls the number of potential uplink transmission stations. The proposed scheme can be used efficiently in in-aircraft wireless sensor network where a large number of sensors need to be supported. By using the proposed scheme, since in-aircraft sensors attempt channel access using the proposed differentiated OBO parameters, the number of stations exceeds the access capacity can be efficiently controlled. This paper also provides the mathematical analysis of the proposed scheme, regarding the optimal parameters. According to the performance analysis, the proposed scheme is able to efficiently control the access behavior of wireless sensors in the network.
바이오센서 기반 특징 추출 기법 및 감정 인식 모델 개발
조예리(Ye Ri Cho),배동성(Dong Sung Pae),이윤규(Yun Kyu Lee),안우진(Ahn Woo Jin),임묘택(Myo Taeg Lim),강태구(Tae Koo Kang) 대한전기학회 2018 전기학회논문지 Vol.67 No.11
The technology of emotion recognition is necessary for human computer interaction communication. There are many cases where one cannot communicate without considering one"s emotion. As such, emotional recognition technology is an essential element in the field of communication. n this regard, it is highly utilized in various fields. Various bio-sensor sensors are used for human emotional recognition and can be used to measure emotions. This paper proposes a system for recognizing human emotions using two physiological sensors. For emotional classification, two-dimensional Russell"s emotional model was used, and a method of classification based on personality was proposed by extracting sensor-specific characteristics. In addition, the emotional model was divided into four emotions using the Support Vector Machine classification algorithm. Finally, the proposed emotional recognition system was evaluated through a practical experiment.
한국우주전파관측망(KVN)을 위한 시각 시스템 구축과 성능측정
오세진,제도흥,이창훈,노덕규,정현수,변도영,김광동,김효령,정구영,안우진,황정욱,Oh, Se-Jin,Je, Do-Heung,Lee, Chang-Hoon,Roh, Duk-Gyoo,Chung, Hyun-Soo,Byun, Do-Young,Kim, Kwang-Dong,Kim, Hyo-Ryung,Jung, Gu-Young,Ahn, Woo-Jin,Hwang, Jeong 한국천문학회 2007 天文學論叢 Vol.22 No.4
In this paper, we describe the proposed KVN (Korean VLBI Network) clock system in order to make the observation of the VLBI effectively. In general, the GPS system is widely used for the time information in the single dish observation. In the case of VLBI observation, a very high precise frequency standard is needed to perform the observation in accordance with the observation frequency using the radio telescope with over 100km distance. The objective of the high precise clock system is to insert the time-tagging information to the observed data and to synchronize it with the same clock in overall equipments which used in station. The AHM (Active Hydrogen Maser) and clock system are basically used as a frequency standard equipments at VLBI station. This system is also adopted in KVN. The proposed KVN clock system at each station consists of the AHM, GPS time comparator, standard clock system, time distributor, and frequency standard distributor. The basic experiments were performed to check the AHM system specification and to verify the effectiveness of implemented KVN clock system. In this paper, we briefly introduce the KVN clock system configuration and experimental results.