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실시간 무선 센서 네트워크에서 IEEE 802.15.4 클러스터트리 기반의 토폴로지 최적화에 관한 연구
박명곤(Myung-Gon Park),김강욱(Kang-Wook Kim),이창건(Chang-Gun Lee) 한국정보과학회 2010 한국정보과학회 학술발표논문집 Vol.37 No.1D
IEEE 802.15.4 무선 센서 네트워크는 표적 추적, 재난 관리 등의 실시간 시스템 구축을 위한 기술로써 그 수요가 증가하고 있다. 전체 네트워크의 수명을 최대화하기 위해서 네트워크 토폴로지, 각 노드의 Beacon Interval(BI)과 Superframe Duration(SD), 그리고 송신 출력을 고려해야한다. 본 논문에서는 클러스터 트리 기반의 IEEE 802.15.4 무선 센서 네트워크에서 실시간성 데이터의 종단간 데드라인을 결정적으로 보장하고 각 노드의 전력 소모량을 줄여 전체 네트워크의 수명을 최대화하기 위해 고려해야할 파라미터를 소개하고 이에 대해 논의한다.
5종 생약(진피, 청피, 귤핵, 지실, 지각)의 Flavanone Glycoside 함량분석과 Peroxynitrite 소거효과
누그로호 아궁,진성은,최재수,박명곤,박희준 한국생약학회 2009 생약학회지 Vol.40 No.4
Overproduction of peroxynitrite (ONOO - ) causes a variety of disease such as atherosclerosis, hypercholesterolemia, diabetes mellitus or obesity. Peroxynitrite scavenging activities and HPLC analysis on the five Oriental medicinal drugs belong - ing to the genus Citrus, Aurantium or Poncirus (Rutaceae family) and HPLC analysis were taken to evaluate flavanone glycosides with peroxynitrite scavenging activity. The IC50s of the five crude drugs were shown as follows: Aurantii nobilis Pericarpium (Jinpi, 18.3 µg/ml), Citrii unshiu Pericarpium (Chungpi, 7.50 µg/ml), Citrii unshiu Semen (Gyulhaek, >50.0 µg/ ml), Aurantii Fructus (Jigak, 18.3 µg/ml), and Poncirii Fructus (Jisil, >50.0 µg/ml) where Korean crude drug’s names are noted in the parenthesis. Peroxynitrite scavenging effect of flavanones or their glycosides usually contained in Citrus species were observed as follows: hesperetin (1.89 µg/ml), naringenin (7.77 µg/ml), hesperidin (8.44 µg/ml), poncirin (>50.0 µg/ml)and ponciretin(>50.0 µg/ml). The activities of naringin and poncirin with α-L-rhamnopyranosyl(1→2)-β-D-glucopyranosyl moiety were weak. HPLC analytical data revealed that Jinpi (the peels of mature fruits of Citrus unshiu) and Chungpi (the peels of immature fruits of C. unshiu) had high quantities of hesperidin as the value of 142.1±0.21 and 104.51±1.10 mg/g dried weight, respectively. Poncirin was clearly detected in only Jisil and naringenin and naringin were not observed on the HPLC chromatogram of the five crude drugs.
조민선,이수출,권용목,황병욱,임은지,박명곤,정석용,이중범,김재창 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Gamma-alumina (γ-Al<sub>2</sub>O<sub>3</sub>) is used as a support or an additive material to design a potassium-based solid sorbent for CO<sub>2</sub> capture from flue gas. However, the potassium-based γ-Al<sub>2</sub>O<sub>3</sub> sorbent was deactivated due to the by-product like KAl(CO<sub>3</sub>)(OH)2 which was formed by reaction of K<sub>2</sub>CO<sub>3</sub> with γ-Al<sub>2</sub>O<sub>3</sub> during CO<sub>2</sub> sorption. To overcome this problem, novel potassium-based solid sorbents were prepared by impregnation of various support materials with 30 wt.% K<sub>2</sub>CO<sub>3</sub>. In this study, CO<sub>2</sub> sorption and regeneration properties of the potassium-based sorbents were investigated in a fixed bed reactor at low temperature range between 60℃ and 200℃. And the structure changes of the potassiumbased sorbents were investigated by power X-ray diffraction. In particular, the CO<sub>2</sub> capture capacity of a KSnI30 sorbent, which was prepared by impregnation of SnO<sub>2</sub> with K<sub>2</sub>CO<sub>3</sub>, was 83.2 mg CO<sub>2</sub>/g sorbent and was maintained without deactivation during multiple cycles. These results were due to the formation of KHCO<sub>3</sub>, which could be easily converted to K<sub>2</sub>CO<sub>3</sub> even at 200℃, without by-products, which is formed by reaction of active material, K<sub>2</sub>CO<sub>3</sub>, with a support or an additive material during CO<sub>2</sub> sorption. From these results, we conclude that SnO<sub>2</sub> can be used as a support or an additive material instead of γ-Al<sub>2</sub>O<sub>3</sub> to design the regenerable potassium-based sorbent for CO<sub>2</sub> capture at low temperatures.