http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유기 붕소 화합물의 아민화 반응을 이용한 Aminophosphonic Acid의 새로운 합성방법
김상범,조경연,홍석인,Kim, Sang Beom,Jo, Gyeong Yeon,Hong, Seok In 대한화학회 1994 대한화학회지 Vol.38 No.9
인을 포함한 유기 붕소 화합물의 아민화 반응을 이용하여 aminophosphonic acids를 합성하는 새로운 방법이 연구되었다. Diethyl 2-methyl-2-propenyl-phosphonate, diethyl 3-butenylphosphonate를 보란으로 수소화 붕소화시킨 뒤 이들을 hydroxylamine-O-sulfonic acid로 아민화시켜 각각 diethyl 3-aminopropylphosphonate, diethyl 3-amino-2-methyl-2-propylphosphonate 및 diethyl 4-aminobutylphosphonate를 합성하였으며, 이를 가수분해하여 해당하는 aminophosphonic acid들을 얻었다. New synthetic method of aminophosphonic acids by the amination of organoboranes containing phosphorus was developed. Thus, the hydroboration of diethyl 2-propenylphosphonate, diethyl 2-methyl-2-propenyl-phosphonate, diethyl 3-butenylphosphonate with borane-THF, followed by amination of the resulting organoboranes with hydroxylamine-O-sulfonic acid gave diethyl 3-aminopropylphosphonate, diethyl 3-amino-2-methyl-2-propylphosphonate and diethyl 4-aminobutylphosphonate, respectively. 3-Aminopropylphosphonic acid and 4-aminobutylphosphonic, acid were obtained by the hydrolysis of the corresponding esters, respectively.
154 kV 복도체 가공송전선로에서 전자력에 의한 소도체간 접촉
김상범,노희원,김영홍,고광만,박종혁,김상수,Kim, Sang-Beom,Noh, Hee-Won,Kim, Young-Hong,Ko, Kwang-Man,Park, Jong-Hyuk,Kim, Sang-Soo 한국전력공사 2016 KEPCO Journal on electric power and energy Vol.2 No.3
국내 154 kV 복도체 가공송전선로를 대상으로 전자력에 의한 소도체간 접촉현상을 실증적으로 재현하고 대처 방안을 제시하였다. 도체에 흐르는 전류의 크기가 클수록, 스페이서의 간격이 클수록 소도체간에 작용하는 전자력은 크게 측정되었다. 스페이서 간격이 68 m일 경우 전류 크기가 2,000 A 일 때부터 소도체는 불안정한 상태가 되어 소도체간 간격이 변화하는 횡방향 진동이 시작되었다. 스페이서 간격이 136 m일 경우 전류 크기가 증가할수록 소도체간 간격은 좁아지다가 2,250 A 일 때 두 소도체는 완전히 접촉하였다. 스페이서 간격에 따른 전자력의 크기를 도식화하고 안전한 스페이서 간격을 제시하였다. 시험선로와 실선로 간에는 접촉현상이 발생하는 조건이 상이한 것으로 나타났으며, 이는 송전선로 가선 과정에서 도체에 가해진 여러 형태의 잔류 응력, 바람 조건 등의 차이 때문으로 판단되었다. Kissing of sub-conductors due to magnetic forces has been investigated in a 154 kV bundled overhead transmission line. With increasing ampacity of the conductors and enlarging the distance between spacers, lager magnetic force was measured. When the phase ampacity was 2,000 amps and the distance between two adjacent spacers was 68 m, for instance, the conductors became unstable and vibrated with a frequency of several herts. Furthermore, when the ampacity was 2,250 amps and the distance between spacers was 136 m, the two sub-conductors were contacted. Analysing the magnetic forces with distance of spacers, the safe distance of spacers to avoid contact of sub-conductors was presented. The change of the safe distance is discussed due to various parameters, such as residual stresses and wind pressures, in the real transmission lines.
안지오제닌을 이용한 Xanthomonas celebensis 5S rRNA의 고차원 구조 분석
김상범,조봉래,임자혜,장수익,박인원,Kim, Sang Beom,Jo, Bong Rae,Im, Ja Hye,Jang, Su Ik,Park, In Won 대한화학회 1994 대한화학회지 Vol.38 No.10
우유에서 추출한 안지오제닌을 사용하여 Xanthomonas celebensis 5S rRNA의 고차원 구조를 조사하였다. 안지오제닌은 5S rRNA의 단일가닥 부분에 있는 피리미딘 염기들의 먼 쪽으로 있는 3' P-O 에스테르 결합들만을 절단하였다. pH 7.0이고 10 mM의 $Mg^{2+}$이 있을 때 안지오제닌은 5S rRNA의 d 고리에서만 작용하였지만 $Mg^{2+}$이 없을 때는 e 고리를 제외한 모든 고리들(a, b, c, d 고리들)에서 작용하였다. $Mg^{2+}$이 없을 때 $U_{74}$-$G_{75}$와 $U_{77}$-$A_{78}$, $U_{103}$-$A_{104}$ 결합들이 pH 7.0과 pH 3.5에서 모두 안지오제닌의 작용에 매우 민감하였다. 한편 pH 3.5이고 $Mg^{2+}$이 없을 때 안지오제닌이 a 고리의 $C_{17}$-$G_{18}$과 b고리의 $U_{55}$-$G_{56}$ 결합들을 강하게 절단하였다. 이러한 결과들에서 우리는 다음과 같이 결론을 내릴 수 있다. 첫째, 안지오제닌을 5S rRNA의 삼차구조 분석에서의 탐침의 하나로 사용할 수 있음을 알았다. 둘째, 5S rRNA의 d고리의 구조는 $Mg^{2+}$과 $H^+$농도에 따라 변하기 쉽다는 것을 알았다. Higher order structure of 5S rRNA isolated from Xanthomonas celebensis was examined using angiogenic extracted from milk. Angiogenin cleaved exclusively 3' P-O bonds on the far sides of pyrimidines in the single-stranded sequences of 5S rRNA. Whereas angiogenin acted only on the loop d of 5S rRNA at pH 7.0 in the presence of 10 mM $Mg^{2+}$, it acted on all the loops (a, b, c and d) except loop e in the absence of $Mg^{2+}$. In the absence of $Mg^{2+}$, bonds $U_{74}$-$G_{75}$, $U_{77}$-$A_{78}$ and $U_{103}$-$A_{104}$ were highly susceptible to the action of angiogenin both at pH 7.0 and at pH 3.5. On the other hand, at pH 3.5 in the absence of $Mg^{2+}$ angiogenin strongly cleaved the bond $C_{17}$-$G_{18}$ of loop a and the bond $U_{55}$-$G_{56}$ of loop b. The results lead us to the following conclusion. First, angiogenin can be used as one of the probes for the tertiary structure analysis of 5S rRNA. Second, the structure of loop d of 5S rRNA is variable depending on the concentrations of $Mg^{2+}$ and $H^{1+}$.
김상범,정기택,조수헌,복진영,이종률,Kim Sang-Beom,Jeong Kee-Taeg,Cho Soo-Heon,Bock Jin-Young,Lee Joung-Ryoul 한국연초학회 2006 한국연초학회지 Vol.28 No.1
To get the informations of burley leaf, the chemical constituents, quality indices, leaf color and the effects of climatic factors on the physicochemical properties of leaf produced from 2000 to 2004 crop years at 6 growing areas were analysed. The average leaf chemical contents for 5 years were as follows ; nicotine 2.87%, total nitrogen 4.55%, and chlorine 0.57%. The nicotine content was low while total nitrogen was slightly high as compared with recommended contents(nicotine ; $3.0{\sim}3.5%$, total nitrogen; $4.0{\sim}4.5%$). The variations of physicochemical properties among crop years were high while those of growing areas were relatively low. The nicotine contents of upper leaves were positively correlated to the sunshine hours in June and negatively correlated to the rainfalls in June and July according to crop years. However the total nitrogen content of upper leaves were positively correlated to the rainfalls in July according to growing areas. The tan-tended colored leaves were produced under the high air temperature, drought and long sunshine weather condition while the buff-tended colored leaves were produced under the contra교 condition according to crop years. It is considered that the increasing of nicotine content of Lugs may be available to decrease the nitrogen number(nitrogen/nicotine ratio) of leaf tobacco.
김상범,정기택,조수헌,복진영,이종률,Kim Sang-Beom,Jeong Kee-Taeg,Cho Soo-Heon,Bock Jin-Young,Lee Joung-Ryoul 한국연초학회 2006 한국연초학회지 Vol.28 No.1
To get the information of flue-cured leaf, the chemical constituents, quality indices, leaf color and the effects of climatic factors on the physicochemical properties of leaf produced from 2000 to 2004 crop years at 6 growing areas were analysed. The average leaf chemical contents for 5 years were as follows ; nicotine 2.22%, total sugar 28.0%, total nitrogen 1.89%, ether extracts 6.37% and chlorine 0.38%. The nicotine and total nitrogen contents were low while the total sugar were high as compared with KT&G recommended contents(nicotine ; $2.5{\sim}3.0%$, total nitrogen; $2.0{\sim}2.5%$, total sugar ; below 25.0%). The variations of physicochemical properties among crop years were high while those of growing areas relatively low. The nicotine content of leaf was negatively correlated to the rainfalls in June and July sugar content was negatively correlated to the average air temperature in June and July according to crop years. The orange colored leaves were produced under the drought and long sunshine weather condition while the lemon colored leaves were produced under the contrary condition according to crop years. Blending the different crop year's leaves in the proper way may be beneficial to produce of uniform and consistent cigarettes. It is considered that the increasing of nitrogen fertilizer or improving of nitrogen uptake may be available to increase the nicotine and nitrogen and decrease the total sugar contents of flue-cured leaf tobacco.