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ATM-PON 시스템의 상향 매채접속제어 프로토콜 성능분석
박구현,손윤수 弘益大學校 科學基術硏究所 1999 科學技術硏究論文集 Vol.10 No.2
ATM-PON(Asynchronous Transfer Mode-Passive Optical Networks) System is an alternative of the near future optical access network. Since it has the tree topology composed of passive splitters, downstream traffic is broadcasted and upstream traffic is transmitted by medium access control(MAC). Hence upstream MAC protocol has an effect on system performance. In this study we analyzed Global-FIFO and BPP(Belt Permit Programming) protocols by simulation. We also proposed a revised Global-FIFO improving the CDV(Cell Delay Variation) problem, which is a weak point of Global-FIFO. The simulation results shows that the proposed method is better than the original one in transfer delay as well as CDV.
Lpophilicity vs. Antitumor Activity of Carboxylatoplatinum(lV) Complexes
송리타,김관묵,손윤수,Song, Ri Ta,Kim, Gwan Muk,Son, Yun Su Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.10
Acylation of an intermediate tetrahydroxoplatinum(IV) complex, $[Pt(OH)_4(dach)]$ (dach = $trans-(\pm)-12-di-aminocyclohexane)$, with one or two kinds of carboxylic anhydrides in stepwise manner afforded various car-boxylatoplatinum(IV) complexes, $[Pt(O_2CR)\chi(OR’)4-\chi(dach)]$ (R = $(CH_2)_3CH_3$ or $C(CH_3)_3$, R’ = H or $OCCH_3$, and $\chi$ = 1-4) with a wide range of lipophilicity. The title complexes were subjected to bioassay using the murine leukemia L1210 cell line, and in particular, their in vivo oral antitumor activity was attempted to correlate with their lipophilicity and water solubility. The most orally active complex exhibited intermediate lipophilicity and water solubility, but it has been found that an exact relationship between the lipophilicity and oral anticancer activity could not be established, since the lipophilicity of the complexes is not the sole parameter to determine the oral activity. One of the important intermediate complexes partially substituted was subjected to X-ray anal-ysis for positit of the substituted group: $[Pt(OPiv)_3(OH)(dach)]$ crystallizes in the tetragonal sys-tem, space group $P42_1c$ with a = 21.161(3) $\AA$, b = 21.161(6) $\AA$, c = 12.816(3) $\AA$, $\alpha=\beta=$ r $=90^{\circ}$, V = 5739(2) $\AA^3$ and Z = 8.
2단계 연속배양과 분해세균에 의한 2,4,6-trinitrotoluene (TNT)의 제거
김현영,강양미,손윤수,송흥규 강원대학교 기초과학연구소 2000 기초과학연구 Vol.11 No.-
Degradation of 2,4,6-trinitrotoluene (TNT) by a white rot fungus lrpex lacteus and activated sludge was investigated in two step bench-scale continuous stirred tank reactors. Inoculum for the first reactor was I. lacteus which already showed a high degradation activity for TNT, and activated sludge from a sewage treatment plant was used as an inoculum for the second reactor. The two-step continuous culture experiment was conducted for 150 days using synthetic feed containing different levels of TNT (10 to 300 mg/L) at room temperature. When a hydraulic retention time of 36 h was maintained, the highest TNT removal rates were 1.66 mg/L/h in first reactor and 0.82 mg/L/h in second reactor during the period of 71~100 days from the start-up. These results indicate the application potential of two-step continuous reactor system for treatment of TNT-containing wastewater. Several TNT-degrading bacteria were isolated from the second reactor, and their biodegradation capabilities were examined. TNT was completely disappeared within 6 hours of further incubation when 100 mg/L of TNT was added into 1-day pregrown C1 bacterial culture. However, this bacterium was unable to use TNT as a sole source of carcon. TNT degration might be accomplished by a cometabolic process using glucose as a growth substrate.
최칠남,윤석진,김일두,김성평,손윤수,Chil Nam Choe,Suk Jin Yuon,Il Du Kim,Sung Pyung Kim,Youn Soo Sohn 대한화학회 1989 대한화학회지 Vol.33 No.5
란탄나이드 3가 (Pr(III)와 Yb(III))와 2,2,6,6-tetramethyl-3,5-heptanedione(dipivaloylmethane) 착물들의 전기화학적 거동을 DC와 DP 그리고 CV 방법으로 조사하였다. 란탄나이드 3가 착물들 중 Pr(III)의 환원은 Ag-AgCl 전극으로 Epc = -0.13 V와 -0.80 V 그리고 Yb(III)는 -0.02 Ⅴ로 1전자이동에 의한 것임을 알았고, 1차 화학평형반응이 가역과 비가역으로 진행되는 ErCr전극과정임을 DP와 CV로부터 알았다. 평형상수 lnK는 여러 용매들로부터 얻었고, 이들 상수는 용매의 유전상수가 감소함에 따라 증가됨을 알았다. 이들 반응에서 lnK는 여러 용매에 대한 ln(1/D)을 도시하면 좋은 직선관계에 있었고, 이 때 란탄나이드의 거동은 원자번호가 증가함에 따라서 lnK가 감소하였다. The chemical behavior of trivalent lanthanide (Pr(III) and Yb(III)) and 2, 2, 6, 6-tetramethyl-3, 5-heptanedione(dipivaloylmethane) complexes was investigated by the use of direct current, differential pulse polarography and cyclic voltammetry. In this study, it was founded that the reduction of trivalent lanthanide complexes was observed by one electron transfer process at Epc = -0. 13 V and -0.80 V of Pr(III), and -0.02 V of Yb(III) vs. Ag-AgCl electrode. Also, it was founded that the treatment of DP and CV to the case of a first-order chemical equilibrium reaction preceding a reversible and irreversible one electron transfer reaction, (a >0. 5) the socalled ErCr electrode process. The equilibrium constant (lnK) obtained, of various solvents, these constant were founded to be increases with decreasing dielectric constant of the solvents. Plots of lnK for these reaction against ln(l/D) for the solvents was fairly straight lines, and the behavior of the heavier lanthanides was decreased equilibrium constant with increasing atomic number.