통신해양기상위성 1호기의 영상오차보상(IMC) 알고리즘 설계

정택서,박상영,오종현,이운섭,주광혁,박영웅,양군호 한국항공우주학회 2005 한국항공우주학회 학술발표회 논문집 Vol.- No.-

통신해상기상위성-1호의 궤도특성 및 궤도오차에 의한 INR 시스템의 영상오차 분석

정택서,오종현,노경민,박상영,주광혁,박영웅,양군호 한국우주과학회 2005 한국우주과학회보 Vol.14 No.1

통신해양기상위성 1호기의 영상위치유지를 위한 영상오차보상(IMC) 알고리즘 설계

정택서,박상영,이운섭,주광혁,양군호 한국우주과학회 2006 Journal of Astronomy and Space Sciences Vol.23 No.1

기능성 막 제조를 위한 DPPC 지질막과 탄수화물 혼합막에 관한 연구

정택서,이재성,이기창,홍장후 ( Teak Suh Jeong,Jae Seong Rhee,Ki Chang Lee,Jang Hoo Hong ) 한국공업화학회 1996 공업화학 Vol.7 No.2

막의 기능설계를 하기 위하여 DPPC(dipalmitoylphosphatidylcholine)인 지질로 제조한 liposome과 DPPC와 DTAB(dodecyltrimethylammonium bromide)를 혼합하여 liposome을 제조하여 그 구조변화를 조사하였다. 막 구조의 변화는 CF(carboxylfluorescein)를 이용하여 DPPC의 상전이 온도(t_c=41℃) 이상과 이하에서 측정하여 평가하였다. DPPC liposome에 함유된 CF의 유출에 의한 형광강도는 45℃에서 증가되었지만 20℃에서는 그 변화는 관측되지 않았다. 동등한 조건에서 DPPC/DTAB liposome에서 CF 유출에 의한 형광강도의 변화는 DPPC liposome에 비하여 큰 것이 관측되었다. 이 결과는 DPPC/DTAB liposome이 불규칙한 배열을 하고 있다는 것을 시사한다. 한편 Ca^(2+) 존재하에서 DPPC liposome과 DTAB/DPPC liposome에서 Quin 2의 형광강도는 45℃에서 현저히 증가되었지만 20℃에서는 거의 변화하지 않았다. 그리고 형광강도의 변화는 DPPC/DTAB liposome보다 DPPC liposome 쪽이 더 크게 나타났다. 이것은 DPPC/DTAB liposome의 구조가 DPPC liposome보다 더 안정하다는 것을 의미한다. 또한 형광물질인 ANS를 이용하여 막 표면의 양상을 조사한 결과 DPPC liposome과 DPPC/DTAB liposome에서 ANS의 형광강도는 45℃와 20℃에서 다른 양상을 보였다. 이 양상은 상전이 온도의 이상과 이하에서 DPPC liposome과 DPPC/DTAB liposome의 막유동성을 의미하고 그 변화랑은 DPPC liposome이 DPPC/DTAB liposome보다 더 컸다. 또한 DSC에 의해 측정된 상전이 온도는 DPPC liposome의 경우 41℃이었으며 DPPC/DTAB liposome의 경우에는 32℃이었다. 이상의 결과로 DPPC/DTAB liposome의 분자배열 상태가 불규칙한 것을 의미한다. 그러므로 DPPC/DTAB liposome은 불규칙하게 배열되어 있지만 안정된 구조를 갖고 있다고 생각된다. In this article, we investigate into the structural changes of liposome to design its functional membranes by the synthesis of two types of liposomes, DPPC liposome and DTAB of hydrocarbon substance/DPPC liposome. The changes of membrane structures are evaluated by the CF fluorescent intensity measured above and below the phase transition temperature of the membrane, t_c=41℃. CF fluorescent intensities are enhanced by the CF leakage from DPPC liposome at 45℃, while no changes are observed at 20℃. Under the same conditions, it is observed that the intensity enhanced by CF leakage from DPPC/DTAB liposome is larger than that of DPPC liposome alone, which suggests that DPPC/DTAB liposome has irregular arrangement. Under the presence of Ca^(2+), Quin 2 fluorescent intensity in either DPPC liposome or DPPC/DTAB liposome is significantly increasing at 45℃, while almost none of the changes are observed at 20℃. The fluorescent intensity of DPPC liposome turns out to be larger than that of DPPC/DTAB liposome, which suggests that the DPPC/DTAB liposome is structurally more stable than the DPPC liposome. Additionally, when the analysis is done to observe changes in the shapes of membrane surfaces with ANS fluorescent, ANS fluorescent under DPPC or DPPC/DTAB liposome shows each of different appearances at 45℃ and 20℃ respectively. This result indicates that its respective membrane fluidity is changing above and below of the designated temperatures in phase transition. As to the magnitude of change of its membrane fluidity, DPPC liposome is much larger than DPPC/DTAB liposome. As far as the temperatures in phase transition measured by DSC are concerned, it is 41℃ and 32℃ for DPPC and DPPC/DTAB liposome respectively, which suggests that DPPC/DTAB liposome has an irregular molecular arrangement in its structure. That is, it is summed up that DPPC/DTAB turns out to be structurally stable, even so, its structure is irregularly arranged.

Cinnamanilide유도체의 가수분해 메카니즘과 반응속도론적 연구

홍장후,강경묵,정택서 서울産業大學校 1990 논문집 Vol.31 No.1

The rate constants of the hydrolysis of cinnamanilide derivatives were determined by UV in H₂SO₄(5-20N), NaOH(5-11N) at 50-110℃ and a rate equation could be applied over a strong acid and strong base were obtained. Final product of the hydrolysis was a cinnamic acid. The ρvalues obtained from the slope of linear plots of log ?? vs. Hammett σconstants were silghtly negatives. Substituents on cinnamanilide showed a relatively small effect, with hydrolysis facilitated be electron donating group. Activation energy (Ea) was also calulated for the hydrolysis of the cinnamanilide. From this reaction rate equation, substituent effect and experimental of rate constants, that the hydrolysis of cinnamanilide was initiated by the netural molecule of H₂O which do not dissociate at strong acid, and proceeded by the hydroxide ion at strong base.

ZSM-5제올라이트 합성에 관한 연구

홍장후,정택서,강경묵,김운겸 서울産業大學校 1998 논문집 Vol.47 No.1

A pentasil zeolite. ZSM-5 was succesfully synthesized at low temperature and atmospheric pressure. The experinments were carried out in four different methods 1, 2 and 3 depending on the concentrations of water, organic template. TPABr (tetrapropy-lammonium bromide) and the presence or absence of seed, the overall molar composition used in this study was 7.83 Na₂O-0.25 Al₂O₃-100SiO₂-xTPABr-yH₂o where x is 1 and 3 mol, and y is 3000mol, 3500mol, and 4000mol. 2³factorial experiments were performed with the results of kinetics studies Na₂O, TPABr and H₂O as main factors, The result showed that the concentration of H₂O is the most important.

PS 판용 Naphthoquinone-(1,2)- diazide-5-sulfonic acid esters의 합성 및 응용

홍장후,정택서,김운겸 서울産業大學校 1999 논문집 Vol.50 No.2

본 연구는 Sodium-2-diazo-napthoquinone-5-sulfonate를 chlorination하여 2-diazo-naphthoquinone-5-sulfonylchloride(NQD-Cl)를 합성하였으며 합성된 NQD-Cl을 여러 종류의 hydroxybenzophenone 유도체와 esterification하여 hydroxy group이 2-diazo-napthoquinone-5-sulfonyl(NQD) group으로 치환된 여러 종류의 naphthoquinone-(1,2)-diazide-5-sulfonic acid esters(NQD-ester)를 합성하였다. NQD-ester의 용해도를 증가시키기 위해 methoxy group이 도입된 유도체와 이와 비교를 위해 hydroxy group만을 가지는 benzophenone 유도체를 사용하여 비교 검토하였다. 합성된 각각의 NQD-ester의 용해특성을 조사하였으며, novolac수지와 formulation하여 감광액을 제조하였다. 제조된 감광액을 알루미늄판에 도포, 건조하여 PS판을 제조하고 감광특성과 광퇴색도와 화상형성에 적합한 노광시간을 조사하였으며, 상대감도를 gray scale(GS)법으로 조사하였다. 치환된 NQD group의 수에 따라 GS법에 의한 상대감도가 다르게 나타나는 것을 알 수 있었다. Methoxy group이 도입된 NQD-ester는 좋은 용해특성을 보여주었으며 시판되는 PS판과 동일한 노광조건에서 비교해 본 결과 보다 우수한 감도를 보였다. 2-Diazo-l-naphthoquinone-5-sulfonyl chloride(NQD-Cl) was synthesized from Sodium-2-diazo-napthoquinone-5-sulfonate by chlorination. Synthesized NQD-Cl was esterified with hydroxybenzophenones to give several naphthoquinone-(1,2)-diazide-5-sulfonic acid esters(NQD-esters). We are investigated comparing benzophenone derivatives with methoxy group and benzophenone derivatives with hydroxy group. Solubility of each NQD-esters was studied and each of NQD-esters was formulated w novolac base resin and PS plates were manufactured. Photosensitivity, bleachability, compatible exposed time and relative sensitivity were determined by UV spectro photometry, imaged by UV lithographic techniques and grey scale method. According to the number of substituted NQD group, it showed that relative sensitivity was different from grey scale. NQD-esters with methoxy group were shown a good solubility and higher sensitivity than commercial PS ones.

Cu/ZSM-5촉매에 대한 NO 및 NH₃TPD 연구

홍장후,정택서,김운겸 서울産業大學校 1996 논문집 Vol.44 No.1

The effect of catalyst acidity and of its absorption property on the catalytic have examined for caption exchanged ZSM-5. Adsorption property of the NH₃and NO over HZSM-5 and Cu/ZSM-5 catalyst was investigated by NH₃,NO TPD. Also, room temperature adsorption and temperature-programmed desorption(TPD) of NO over a Cu/ZSM-5 catalyst active for NO decomposition were investigated. Even at 25℃ N₂O and N₂ were observed as reaction products during NO adsorption but they ceaced when NO adsorption was completed. During NO TPD N₂O , NO and O₂ desorptionpr peaks were observed. A oxygen desorption peak was detected at Ca360 ℃. No decompositive was detected without copper present. NO TPD was also collected over reduced and oxidized catalysts.

Phenyl-2-Thiophenoxy Ethyl Sulfone 유도체의 합성에 관한 연구

강경묵,정택서,홍장후 서울産業大學校 1994 논문집 Vol.39 No.1

Synthesis of phenyl-2-thiophenoxy ethyl sulfone derivatives by nucleophilic addition between phenyl vinyl sulfone and p-substitute thiophenol were investigated to find out more simple and efficient method of synthesis. phenyl vinyl sulfone used as an intermediate was synthesized from thiopheol. the effect of reaction condition such as reaction time, reaction temperature, and types of catalysts on the yield of products were discussed. the molecular structure of synthesized compounds was confirmed by using infrared spectrophotometer and nuclear magnetic resonance spectrometer, and their physical properties were also examined. it was found that optimum reaction time was one hour. maximum yields were obtained when tertamine was used as catalysts at 25℃.

궤도오차에 의한 통신해양기상위성 1호의 INR 지향점 변화

오종현,정택서,노경민,박상영,주광혁,박영웅,양군호 한국항공우주학회 2004 한국항공우주학회 학술발표회 논문집 Vol.- No.-