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장기호 ( Ki Ho Jang ),하병조 ( Byung Jo Ha ) 대한미용학회 2010 대한미용학회지 Vol.6 No.2
High concentration of azelaic acid which is non-soluble to water, oil and ethanol was studied. The cosolvents were used to raise aqueous solution concentration and solubilizing agents were used to prevent from recrystallizing. And the neutralizers were used to raise stability of aqueous solution neutralized as rate of equivalent. Polysorbate 80, polysorbate 60, and lysolecithin were used for solubilizing agents and triethanolamine, arginine, and sodium hydroxide were used for neutralizer. The compositions of azelaic acid were 16% for azelaic acid, 12% for lysolecithin, 37% for propylene glycol, 35% for water, respectively. The solubility of azelaic acid to water was increased to 16% from 0.2%. And its solubility was increased 11% from 0.2% when propylene glycol as cosolvent was used and surfactant was not. Also, solubility for azelaic acid salts were increased in 35% and 30%, respectively when triethanolamine and arginine as rate of equivalent of azelaic acid were used to control pH. The solubilities of surfactant, cosolvent and neutralizer which affected product stability were as follows; in case of the surfactants 25% for lysolecithin, 24% for polysorbate 80 and 23% for polysorbate 60. In case of cosolvents, 12% for propylene glycol, 14% for polyethylene glycol, 2% for glycerine and 0.2% for sorbitol. In case of the neutralizers, the solubilities of azelaic acid increased with sodium hydroxide, arginine and triethanolamine in sequence.
새로운 질소-산소계 여러 자리 리간드의 합성 및 전이금속(Ⅱ)이온 착물의 안정도상수
김선덕,장기호,김준광,Kim, Sun Deuk,Jang, Ki Ho,Kim, Jun Kwang 대한화학회 1998 대한화학회지 Vol.42 No.5
Multidentate N,O-containing ligands, such as N,N'-bis(2-hydroxybenzyl)-ethylenediamine(BHED), N,N'-bis(2-hydroxybenzyl)-propylenediamine(BHPD), N,N'-bis(2-hydroxybenzyl)-diethylenetriamine(BHDT), N,N'-bis(2-hydroxybenzyl)-triethylenetriamine(BHTT) and N,N'-bis(2-hydroxybenzyl)-tetraethylenepentaamine (BHTP) were synthesized by reduction of the imine group of Bis(salicylidene)-ethylendiamine(BSED), Bis (salicylidene)-propylenediamine(BSPD), Bis(salicylidene)-diethylentriamine(BSDT), Bis(salicylidene)-triethylenetetraamine(BSTT) and Bis(salicylidene)-tetraethylenepentaamine(BSTP). Proton dissociation constants of the ligands and stability constants of transition metal(Ⅱ) ion complexes with BHED, BHPD, BHDT, BHTT, and BHTP were determined by potentiometic titration. The sequence of stability constants $(logK_{ML})$ of complex increases as BHED<BHPD<BHDT<BHTT<BHTP as the number of donor atom increases. The order of stability constant for the transition metal ions is CO(Ⅱ)<Ni(Ⅱ)<Cu(Ⅱ)> Zn(Ⅱ) which follows the Irving-Williams series. 여러자리 산소-질소계 리간드들은 시프염기 리간드인 Bis(salicylidene)-ethylendiamine(BSED), Bis(salicylidene)-propylenediamine(BSPD), Bis(salicylidene)-diethylenetriamine(BSDT), Bis(salicylidene)-triethylenetetraamine(BSTT) 및 Bis(salicylidene)-tetraethylenepentaamine(BSTP)의 이민기를 수소환원장치에서 백금촉매를 이용하여 네자리 리간드인 N,N'-bis(2-hydroxybenzyl)-ethylenediamine(BHED)과 N,N'-bis(2-hydroxybenzyl)-propylenediamine(BHPD), 다섯자리 N,N'-bis(2-hydroxybenzyl)-diethylenetriamine(BHDT), 여섯자리 N,N'-bis(2-hydroxybenzyl)-triethylenetriamine(BHTT), 일곱자리 N,N'-bis(2-hydroxybenzyl)-tetraethylenepentaamine(BHTP) 리간드들을 합성하였다. 리간드들의 양성자 해리상수와 전이금속(Ⅱ)과 착물의 안정도상수는 전위차 적정법으로 측정하였다. 리간드별 전이금속(Ⅱ)이온에 대한 착물 안정도상수값$(logK_{ML})$의 크기는 BHED<BHPD<BHDT<BHTT<BHTP순서로 주개 원자수에 따라 증가하였다. 전이금속(Ⅱ) 이온들 사이의 착물 안정도 상수값의 크기는 코발트(Ⅱ)<니켈(Ⅱ)<구리(Ⅱ)>아연(Ⅱ)의 순서로 이 결과는 Irving-Williams 서열과 잘 일치하여 증가하였다.
구리(Ⅱ)-아민류 착물에 의한 l-ascorbic acid의 산화반응속도와 메카니즘
김선덕,박정은,장기호,신한철,김창수,Kim, Sun-Deuk,Park, Jung-Eun,Jang, Ki-Ho,Shin, Han-Chul,Kim, Chang-Su 대한화학회 1995 대한화학회지 Vol.39 No.1
구리(II)-아민류 착물에 의한 l-ascorbic acid의 산화반응속도를 pH 4.6에서 Onishi 방법으로 측정하였다. 이 반응의 메커니즘은 l-ascorbic acid가 구리(II) 착물에 배위된 다음 속도결정단계에서, 전자이동이 일어나는 내부권 메커니즘에 따라 반응이 진행됨을 알았다. The rates for the oxidation reaction of l-ascorbic acid by Cu(Ⅱ)-polyamine complexes were measured by Onish's method at the pH 4.6. The oxidation process of l-ascorbic acid is proposed to occur by the inner-sphere mechanism that involves the formation of a Cu(Ⅱ)-ascorbic acid complex and electron transfer at the rate-determining step.
미지의 붐 진동을 위한 퍼지 제어기를 사용한 탐사 로봇의 위치 제어
이승철(Seung-Chul Lee),한병조(Byung-Jo Han),박기광(Ki-Kwang Park),장기호(Gi-Ho Jang),양해원(Hai-Won Yang) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
This paper proposed a robust controller in order to handle the boom vibration of inspection robot. While a inspection robot moves on boom with vibration by weight occurs. Therefore, Boom as structure like cantilever beam appears vibration by weight of inspection robot. The Z axis of inspection robot operates with Sliding structure. inspection robot is used "Fuzzy Controller" for position control with Z axis. The developed robot system is composed of the specially designed car for inspection robot. The proposed Fuzzy Controllers are used to track position reference signal of Z axis. A Experiment verify that the proposed Fuzzy Controller design method can achieve favorable control performance with regard to external disturbance.