http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
협대역 재밍환경에서 재밍된 파일럿 제거 방법을 이용한 OFDM시스템의 채널추정에 관한 연구
한명수,류탁기,김지형,곽경철,한승엽,홍대식,Han, Myeong-Su,Yu, Tak-Ki,Kim, Ji-Hyung,Kwak, Kyung-Chul,Han, Seung-Youp,Hong, Dae-Sik 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.2C
In Orthogonal Frequency Division Multiplexing (OFDM) systems, Narrow-Band Jamming (NBJ) over pilot tones used for channel estimation degrades the system performance. In this paper, we propose a new jammed pilot detection and elimination algorithm to overcome this problem. Moreover, the average Mean-Squared Error (MSE) on one OFDM symbol both under jammed and removed pilot subcarrier is analyzed. And then, the Symbol Error Rate (SER) performance of the channel estimation scheme using the proposed algorithm is evaluated by simulation. We can confirm that the channel estimator with the proposed algorithm improves the channel estimation performance at a high jamming power. OFDM(Orthogonal Frequency Division Multiplexing) 시스템에서 채널추정을 위해 사용되는 파일럿에 발생하는 협대역 재밍은 시스템 성능에 나쁜 영향을 준다. 본 논문에서는 이 문제를 해결하기 위해 재밍된 파일럿을 검출하여 제거할 수 있는 방법을 제안한다. 또한, 한 개의 OFDM 심볼에서 재밍된 파일럿과 제거된 파일럿으로 인해 발생하는 평균 제곱 오류(Mean Squared Error, MSE)를 분석한다. 그리고, 실험을 통해 제안된 알고리즘을 사용한 채널추정 구조의 심볼 오류율(Symbol Error Rate, SER) 성능을 평가한다. 제안된 방법은 재밍 전력이 높은 환경에서 채널추정 성능을 향상시킬 수 있음을 확인하였다.
L-lysine에 의한 Microcystis sp.의 선택적 성장억제
한명수 ( Han Myeong Su ),최영길 ( Choe Yeong Gil ),송석환 ( Song Seog Hwan ),신규철 ( Sin Gyu Cheol ) 한국환경생물학회 2003 환경생물 : 환경생물학회지 Vol.21 No.2
본 연구는 L-lysine(l-2, 6-Diaminohexanoic acid)의 영향을 받은 남조류와 남조류에 영향을 주는 L-lysine의 농도를 파악 하고자 20종의 Microcystis sp.를 실험에 사용하였다. 남조류의 생장 억제 능력은 double-layered agar method와 microplate method를 이용하여 측정하였다. L-lysine의 농도를 100㎍ ml^(-1)~300㎍ ml^(1) 이상에서 처리한 경우 Microcystis ichthyoblabe NIER-10021 외 7종 Microcystis sp.에서 투명대가 형성되었다. Microplate method에서는 Microcystis viridis NIER-10020외 7종의 Microcystis sp. 에서는 10~500㎍ ml^(-1)의 농도에서 생장억제 및 lysis를 나타내었다. 그리고 Microcystis viridis NIER-10020 외 3종은 10㎍ ml^(-1)이하의 낮은 농도에서도 생장억제 및 분해를 나타내는 높은 활성을 보였다. Various physico-chemical and biological methods have been used to remove cyanobacteria which causes blooms and releases toxin. The purpose of the following experiment is aimed finding out which cyanohacteria are affected by L-lysine and what concentration of L-iysine inhibits cyauobacteria. The 20 samples of Microcystis sp. have been tested. To prove the growth inhibition on Microcystis sp., double-layered agar method and microplate method have been used. When the Concentration of L- lysine is as heavy as 100 ㎍ ml^(-1)-300 ㎍ ml^(-1) some Microcystis sp. have made halo zone. Some Microcystis sp. have shown so high activity as to he inhibited in their growth by the L-lysiue of concentration 10 ㎍ ml^(-1) with microplate method. These activities are various in accordance with every species. In additions, the microplate method has been proven to he an easy way which examine the lytic activity on the species of algae.
Anabaena cylindrical 분해세균 AK-07의 동정과 분해 관련 효소활성 조사
김정동 ( Kim Jeong Dong ),한명수 ( Han Myeong Su ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.2
To investigate bacteria with algal lytic activities against Anabaena cylindrica when water blooming occurs and to study enzyme profiles of alga-lytic bacteria, various bacterial strains were isolated from surface waters and sediments in eurtophic lakes or reservoirs in Korea. A bacterial strain AK-07 was characterized and identified as Acinetobacter johnsonii based on its 16S rDNA base sequence. When AK-07 was co-cultivated with A. cylindrica, bacterial cells propagated to 8×10^8 cfu ml^-1 and lyses algal cells. However, culture filtrates of AK-07 did not exhibit algal lytic activities. That suggesting the enzymes on the surfaces of the bacterium might be effective algal lytic agents to cause lyses of cells. Acinetobacter johnsonii Ak-07 exhibited high degradation activities against A. cylindrica, and formed alginase, caseinase, lipase, fucodian hydrolase, and laminarinase. Moreover, glycosidases for example β-galatosidase, β-glucosidase, β-glucosaminidase, and β-xylosidase, which hydrolyzed β-O-glycosidic bonds, were found in cell-free extracts of A. johnsonii AK-07. Other glycosidase such as α-galactosidases, α-N-Ac-galctosidases, α-mannosidases, and α-L-fucosidases, which cleavage α-O-glycosidic bonds are not detected. In the results, enzyme systems of A. johnsonii AK-07 were very complex to degrade cell walls of cyanobacteria. The polysaccharides or peptidoglycans of A. cylindrica may be hydrolyzed and metabolized to a range of easily utilizable monosaccharides or other low molecular weight organic substances by strain AK-07 of A. johnsonii.
북한강 수계 조류대발생 원인종 남조 Anabaena의 분자계통학적 검토
이준 ( Zhun Li ),한명수 ( Myung Soo Han ),황수옥 ( Su Ok Hwang ),변명섭 ( Myeong Seop Byeon ),황순진 ( Soon Jin Hwang ),김백호 ( Baik Ho Kim ) 한국하천호수학회 2013 생태와 환경 Vol.46 No.2
Between May and August 2012, a massive cyanobacterial bloom with Anabaena has been occurred throughout the North Han River. Sampling was conducted at one station on each lake, L. Uham, L. Cheongpyung, and L. Paldang, where occurred a dense bloom, in 13 July. According to the microscopic examination, the blooms was dominated by one specific filamentous cyanobacterium Anabaena and other phytoplankton. Morphologically, previous literature proven that this Anabaena species is A. crassa (Lemmermann) Komark.-Legn. & Cronberg. However, identification of species in a mixed population is complicated due to limited morphological differences. Therefore, with live sample including trichome, akinete and heterocyst, the sequences of 16S rRNA gene of Anabaena isolates were cloned and analyzed, and three 16S rRNA gene sequences of 1188~1520 bp in length were obtained. It was shown from the homologous analysis results that the obtained 16S rRNA sequences were highly homologous to the relevant sequences of A. crassa in GenBank. The 16S rRNA sequences of 63 species were retrieved from GenBank, and the phylogenetic tree was constructed by using these sequences.
비냉각 열 영상 시트템용 BSCT $320{\times}240$ IR-FPA의 구현
강대석,신경욱,박재우,윤동한,송성해,한명수,Kang, Dae-Seok,Shin, Gyeong-Uk,Park, Jae-U,Yoon, Dong-Han,Song, Seong-Hae,Han, Myeong-Su 대한전자공학회 2002 電子工學會論文誌-SD (Semiconductor and devices) Vol.39 No.11
BSCT 320${\times}$240 IRFPA detector module is implemented, which is a key component in uncooled thermal imaging systems. The detector module consists of two parts, infrared sensitive pixel array and read-out integrated circuit(ROIC). The BSCT 320${\times}$240 pixels are made by laser scribe process and 10-${\mu}m$ micro-bump to satisfy 50-${\mu}m$ pitch and 95-% fill-factor. The ROIC has been designed to electrically address the pixels sequentailly and to improve signal-to-noise ratio with single transistor amplifier, HPF, tunable LPF and clamp circuit. The fabricated hybrid chip of detector and ROIC has been mounted on the TEC built-in ceramic package for more stable operation and tested for lots of electrical and optical properties. The IRFA sample has shown successful properties and met with good results of fill-factor, detectivity and responsivity. 적외선 열 영상 system에서 가장 핵심이 되는 BSCT 320X240 IRFPA를 구현하였다. 검출기 module은 두 개의 부분, 즉 적외선 감지 pixel의 array와 감지된 신호를 읽어내는 ROIC로 구성된다. 50-${\mu}m$의 pitch와 95-%의 fill-factor를 만족하도록, laser scriber공정과 10-${\mu}m$ 크기의 ball을 갖는 micro bump공정을 적용하였다. ROIC는 선택된 신호를 읽어서 순차적으로 출력하게 설계되었으며, 단일 transistor amplifier, HPF, tunable LPF 그리고 clamp circuit를 삽입하여 SNR이 개선되도록 설계하였다. Detector와 ROIC의 결합으로 제작된 hybrid chip은 좀더 안정한 동작을 하도록 TEC가 내장된 ceramic package에 탑재하였다. 제작된 IRFPA sample은 원하는 특성을 만족하였으며, 특히 fill-factor, 탐지도, 반응도면에서 설계의 목표에 잘 근사함을 알 수 있었다.
몇가지 영양염 결핍이 팔당댐의 식물플랑크톤군집에 미치는 영향
김백호 ( Kim Baeg Ho ),최지영 ( Choe Ji Yeong ),황순진 ( Hwang Sun Jin ),한명수 ( Han Myeong Su ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.1
To understand the efect of nutrient deficiency i\on the plankton community in three station with different water qualties in Pal`tang Reservoir, Korea, phytoplanktons (>10㎛) were cultured in nutrient enrichment Qllen`s medoa (AM) and nutrient-deficient Allen`s media. A distinct shift in the species composition and biomass of phytoplankton (as chlorophyll-a) showed in all treatments. in particular, it was very interesting that the new development of cyanobacterium Microcystis aeruginosa occured by the Fe-deficient AM. Except for Si, a community growth (as chlorophyll-a) was inhibited in all nutrient deficient treatments. Species diversity after nutrient deficiency was changed to below 2.0; slightly increased in N and P-deficiency, while decreased in Si and Fe, respectively. As suggested, dominance was entirely opposite to deversity. Therefore , the nutrient dsficient effectively induced the succession of species and biomass, phytoplankton community, suggesting a possibility as a reliable tool to control the algal bloom in eutrophic lakes and reservoirs.