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이기훈,유현일,최한길,Lee, Ki-Hun,Yoo, Hyun-Il,Choi, Han-Gil 한국조류학회(藻類) 2007 ALGAE Vol.22 No.3
Marine algal flora and community structure of medicinal seaweeds were examined at Kkotji of Taean Peninsula, Korea from May 2005 to January 2006. Seventy-nine seaweeds including 42 medicinal algae and one marine plant were identified. Sargassum thunbergii was the representative alga occurred at all seasons and shore levels. The dominant medicinal seaweeds were perennial S. thunbergii, Neorhodomela aculeata, and Corallina pilulifera, and ephemeral Monostroma grevillei, Porphyra yezoensis, and Ulva pertusa. Their vertical distribution were N. aculeata ? P. yezoensis, M. grevillei, and U. pertusa ? C. pilulifera from high to low intertidal zone. The average biomass of medicinal seaweeds varied from 34.17 g m?2 in spring to 56.41 g m?2 in summer. At Kkotji shore, the opportunistic species (Enteromorpha, Ulva, and Cladophora) and turf-forming algae (Caulacanthus okamurae and Gelidium divaricatum) were easily observed. Such fast growing ESG II (ecological state group) was 87.50% and slow growing perennial algae, ESG I was only 12.15%. Also, diversity index (H’) and dominance index (DI) indicate that the seaweed community of Kkotji is unstable. Therefore, Kkotji rocky shore should be more protected from human activities such as turbulence and eutrophication in order to maintain species diversity and abundance of medicinal seaweeds.
이기훈(Lee Ki-Hun),이근호(Lee Geun-Ho),배인호(Bae In-Ho),정태형(Chong Tae-Hyung) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
The hypoid gear has advantage for the high reduction ratio and compactness. But, geometry design and strength evaluation of the hypoid gear are complex and difficult. This paper proposes the development of the design programs to satisfying the geometry and strength of a hypoid gear through optimization technique using the genetic algorithm. The genetic algorithm is designed to optimize a method for minimizing volume. The existing design of hypoid gear in the forklift truck axle is compared with the results of developed optimum design program.
하이브리드 수신 기법 기반 상향링크 간헐적 NOMA 시스템의 성능 분석
이기훈(Ki-Hun Lee),정방철(Bang Chul Jung) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
본 논문에서는 각각 단일 안테나를 갖는 두 단말이 다중 안테나를 갖는 하나의 액세스 포인트로 신호를 전송하는 상향링크 간헐적 비직교 다중 접속(bursty non-orthogonal multiple access: B-NOMA) 시스템을 고려한다. 각 단말은 서로 독립적인 확률에 따라 간헐적으로 신호를 전송하고 액세스 포인트는 이 같은 B-NOMA 네트워크를 위해 기존에 제안된 두 단계 구조의 하이브리드 수신 기법에 따라 송신된 신호를 검파한다. 이때, 각 단말의 신호 대 잡음비(signal-to-noise ratio: SNR) 대비 비트 오류율(bit-error-rate: BER) 성능을 수학적으로 분석한다.