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FM 대역 수동형 레이더에서의 오토인코더 기반 거리-도플러 맵 내의 잡음 제거 기법
박도현(Do-Hyun Park),박지훈(Ji Hun Park),김형남(Hyoung-Nam Kim) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
FM 라디오 기반 수동형 레이더 시스템은 상용 FM 라디오 신호를 이용하여 표적을 탐지하는 레이더 시스템으로서, FM 라디오 송신소로부터 직접 경로로 수신되는 기준 신호와 표적으로부터 반사되어 수신되는 표적 신호가 포함된 감시 신호를 수신하여 표적 탐지를 수행한다. 하지만, 수신된 감시 신호에 표적 신호 이외의 클러터 신호 및 잡음으로 인해 표적 탐지 결과 이외의 오탐지 결과가 형성될 수 있고 이는 레이더 시스템의 표적 탐지 성능을 저하시킨다. 본 논문에서는 FM 대역 수동형 레이더에서의 표적 탐지성능을 향상시키기 위한 합성곱 신경망 기반 잡음 제거 오토인코더를 제안하고, 모의실험을 통해 잡음 제거가 가능함을 확인한다.
SOA와 클라우드 컴퓨팅의 상호관계 분석을 통한 단계별 상호협력 방안
김형도(Hyoung Do Kim),김종우(Jong Woo Kim),윤정희(Jung-Hee Yun),권병훈(Byung Hun Kwon) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.4
Cloud computing provides services to multiple consumers with highly extensible resources based on Internet technologies. As the cloud computing rapidly emerges, various issues related with existing service-oriented architecture(SOA) have also been confusingly raised. For example, issues such as encompassing of cloud computing by SOA and substitution of SOA by cloud computing demonstrates potential confusion between the two. This chaos stems from the fact that the two have very similar objectives and/or effects, that both of them are oriented toward services, and that there are diverse definitions on them. This paper arranges and analyzes the various issues about the mutual relationship of SOA and cloud computing for validation and presents step-by-step cooperation ways helpful for both of them.
저피탐 레이터 신호의 LSTM 기반 polyphase 변조 그룹 분류 기법
박도현(Do-Hyun Park),박지훈(Ji-Hun Park),김형남(Hyoung-Nam Kim) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
전자전 지원은 상대방이 방사하는 통신 및 레이더 신호를 수집하여 이로부터 정보를 획득하는 활동이다. 상대방의 레이더 신호를 수집하고 이로부터 레이더 변조 방식을 인식하는 것은 전자전 지원에서 필수적이다. 그러나 저피탐 능력 강화를 위해 다양한 변조 방식이 활용되고 있고, 특히 polyphase 변조 레이더 신호들은 서로 간 특징의 유사성 때문에 이들의 변조 인식에 어려움이 있다. 본 논문에서는 이러한 polyphase 변조 인식의 어려움을 개선하기 위해 순환 신경망 구조 중 하나인 LSTM을 기반으로 하는 변조 그룹 분류 기법을 제안하고 모의실험을 통해 성능을 확인한다.
대기부유분진중의 다환방향족탄화수소의 농도와 변이원성과의 상관관계에 관한 연구
김도형,손동헌,허문녕 중앙대학교 약학연구소 1990 약학 논총 Vol.4 No.-
The total suspended particulate(T.S.P.) were collected on quartz fiber from Mar., 1988 to Feb., 1989 at Chung Ang University using Andersen high-volume air sampler, polynuclear aromatic hydrocarbon(PAH) concentrations in these particulates were analyzed by high performance liquid chromatograph. And the clastogenic effects of airborne particle extracts were examined by the bone marrow micronucleus test. 1) The annual arithmetic mean concentration of T.S.P.(1988.3∼1989.2) was 93.19㎍ / ㎥. 2) The concentration of T.S.P. was low in fall and summer, high in winter and spring. 3) The annual arithmetic mean concentration of polynuclear aromatic hydrocarbon(PAH) were ; benzo(a)pyrene 1.14 ng / ㎥, benzo(ghi)perylene 1.27 ng / ㎥, benzo(k)fluoranthene 0.54 ng / ㎥. And the cytogenic effects, in vivo, of the standard benzo(a)pyrene and were studied adult male mice by the micronucleus test. 4) The lowest effective dose was 25 mg / kg with standard benzo(a)pyrene and had a dose-response between 25 and 200 mg / kg body weight. 5) In the micronucleus test, the mutagenicity by the organic matter extracted(tar) had a clastogenic effect with dose-response between 30, 60, 120 and 300 mg / kg body weight by the intraperitoneal injection and, in the seasonal variation, frequency of micronucleated polychromatic erythrocyte(MNPCE) was high in winter, low in summer. 6) The relationship between frequency of MNPCE and P.A.H. concentration (Benzo(a)pyrene, Benzo(ghi)perylene, Benzo(k)fluorantehne.) in T.S.P. was high.
제지폐수열 회수로부터 에너지 절감 및 온실가스 감축에 관한 실증연구
김도훈 ( Do Hun Kim ),강성효 ( Sung Hyo Kang ),김찬호 ( Chan Ho Kim ),이헌영 ( Heon Young Lee ),조일형 ( Il Hyoung Cho ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.1
Papermaking wastewater contains significant quantities of thermal energy. Consequently, heat recovery in papermaking wastewater can provide paper process with an additional source of renewable energy as steam. Wastewater heat recovery system is achieved by taking wasted energy in wastewater through specially designed shell & tube heat exchangers with a multi pre-filtration system (the so-called ENSAVER system). The feasibility study presented in terms of applications and performance assessments including temperature difference by heat transfer & exchange, energy saving, environmental and economic aspects. The temperature difference between the inlet and outlet wastewater was 6.73±1.83℃, while the temperature difference between the inlet and outlet clean water was 8.68±2.52℃. The temperature and heat efficiencies were 68.6±16.8% and 86±2.1%, respectively. Especially, the obtained heat efficiency was high compared to commercial heat recovery system in which the heat efficiency of < 60% was achieved in industrial wastewater. It was shown that the proposed heat recovery system reduced natural gas costs by 400±112 million won/y and greenhouse gas emissions by 1,069±299 t/y of CO<sub>2</sub>. It could be sure to provide energy saving by employing a wastewater heat recovery system (ENSAVER). Using simulations with a regression model, a quantitative relationship between various variables (X<sub>1</sub>: Inflow rate (m<sup>3</sup>/h) in wastewater, X<sub>2</sub>: Inlet wastewater temperature (℃), X3: Outlet wastewater temperature (℃), X4: Inlet clean temperature (℃), and X5: Outlet clean water temperature (℃) and response Y (Reducing the amount of CO<sub>2</sub> GHG emission (tCO<sub>2</sub>/y)) was established. It is observed that there are tendencies in the linear regression fit, and the model explains the experimental range studied adequately. The fitted regression equation showed a good fit (R<sup>2</sup>=99.56%) of the model.