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나윤철,JongKi Hong,Kang-Jin Kim* 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.4
This study examined the thermal reactions of 2,4-dibromophenol (diBP), 2,6-diBP and 2,4,6-triBP. The products obtained under pyrolytic conditions were analyzed by gas chromatography/mass spectrometry (GC/MS). 2,7-dibromodibenzo-p-dioxin (diBDD) was the major compound produced from the thermal reaction of 2,4-diBP. In addition, monoBDD and triBDDs were obtained through a process of debromination and bromination, respectively. The pyrolysis of 2,6-diBP and 2,4,6-triBP produced two major brominated dioxin isomers through direct condensation and a Smiles rearrangement. The two ortho-Brs in 2,6-diBP and 2,4,6-triBP mainly led to the production of dioxins, whereas in addition to 2,7-diBDD, 2,4-diBP produced two furans as minor products, 2,8-dibromodibenzofuran (diBDF) and 2,4,8-triBDF, through the intermediate dihydroxybiphenyl (DOHB). The maximum yield of the major dioxins was obtained at 400 oC, and decomposition by debromination at 500 oC resulted in less substituted bromodioxins.
나윤철,신춘호,임진익 한국공업화학회 2001 응용화학 Vol.5 No.2
We had been made silicon-based leaving agent of paper from 3-aminopropyltriethoxysilane and trichlorophenylsilane in the solvent of toluene that has been used catalyst reaction by dibutyltindilaulate. And also, the heated polymer stabilized about -50∼250℃ and the insulated polymer resisted upto 7000vo1t/min. New silicon-based leaving agent of paper determined to do 12% on the basis of elastic limit.
Error Analysis of Underwater Vehicle under Influence of Disturbance and Time Delay
나윤철(Yun Cheol Na),이정규(Jeong Kyu Lee),권순홍(Sun Hong Kwon),이만형(Man Hyung Lee) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
The disturbance and time delay can often cause a significant error in the estimation of trajectory of a underwater vehicle. The time delay considered in this study is due to the delayed rudder response to the rudder input from the guidance control part, The simulation tests are performed on maneuver with constant rudder angle, zigzag maneuver, dive-climb maneuver, and corridor pattern maneuver. The results are compared with those of without delay cases.