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저유전물질로의 응용을 휘한 규칙성 메조포러스 실리카 박막에의 HMDS 처리
하태정,최선규,유병곤,박영호,Ha, Tae-Jung,Choi, Sun-Gyu,Yu, Byoung-Gon,Park, Hyung-Ho 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.1
In order to reduce signal delay in ULSI, an intermetal material of low dielectric constant is required. Ordered mesoporous silica film is proper to intermetal dielectric due to its low dielectric constant and superior mechanical properties. The ordered mesoporous silica film prepared by TEOS (tetraethoxysilane) / MTES (methyltriethoxysilane) mixed silica precursor and Brij-76 surfactant was surface-modified by HMDS (hexamethyldisilazane) treatment to reduce its dielectric constant. HMDS can substitute $-Si(CH_3)_3$ groups for -OH groups on the surface of silica wall. In order to modify interior silica wall, HMDS was treated by two different processes except the conventional spin coating. One process is that film is dipped and stirred in HMDS/n-hexane solution, and the other process is that film is exposed to evaporated HMDS. Through the investigation with different HMDS treatment, it was concluded that surface modification in evaporated HMDS was more effective to modify interior silica wall of nano-sized pores.
하태정,이병원,이종록,이준,황선우,조동령,남상해,양민석,이경동,Ha, Tae-Joung,Lee, Byong-Won,Lee, Jong-Rok,Lee, Jun,Hwang, Sun-Woo,Cho, Dong-Young,Nam, Sang-Hae,Yang, Min-Suk,Lee, Kyung-Dong 한국응용생명화학회 2003 한국농화학회지 Vol.46 No.1
쑥갓(Chrysanthemum coronarium L.) 잎으로부터 생리활성 성분을 가진 3풀의 화합물을 분리하여 다양한 spectral data를 종합한 결과, 화합물 1, 2, 3은 terpenoid의 일종인 monoterpene lactone, sesequiterpene lactone과 sterol 화합물인 것으로 밝혀졌으며, 이들은 각각 dihydrotulipinolide, loliolide, $5{\alpha},8{\alpha}-peroxyergosterol$로 동정되었다. 이 화합물들은 쑥갓에서 처음으로 분리-보고되는 화합물이다. 분리된 화합물들의 세포독성을 측정한 결과, 화합물 3은 3종의 인체암 세포주에 대하여 비교적 강한 활성을 나타내었다. Three terpenoids were isolated from the leaves of Chrysanthemum coronarium L. by silica gel chromatography and recrystalization. The structure of compounds 1, 2, and 3, using various spectroscopic data, were identified as to be terpenoid derivatives of dihydrotulipinolide, loliolide, and $5{\alpha},8{\alpha}-peroxyergosterol$, respectively. The presence of these 3 is the first time reported in this plant. The cytotoxic activity of $5{\alpha},8{\alpha}-peroxyergosterol$ showed strong activities against human cancer cell lines such as A549, PC-3, and HCT 116.
하태정,박형호,Ha, Tae-Jung,Park, Hyung-Ho 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.8
Ordered mesoporous oxide films have been focused because of their low density, high interior specific surface area, and high thermal insulation. Specially, the ordered mesoporous oxide films prepared by self-assembly has many advantages due to easy process and high reproducibility. In this work, ordered mesoporous $SiO_2$, $Al_2O_3$, and $TiO_2$ films were synthesized by control of composition and processing parameter. Also, their structural, thermal, and mechanical properties were characterized variously. In conclusion, ordered mesoporous oxides will be one of core materials in new technology due to their excellent and unique properties.
하태정,Ha, Tae-Jeong 한국광산업진흥회 2002 광산업정보 Vol.10 No.-
인터넷 트래픽의 폭증, 네트워크서비스사업자(NSP)간 경쟁심화, 광기술의 발전 등에 따른 광네트워크화의 급속한 진전은 관련 기업들의 체계적인 준비와 대응을 요구하고 있다.
쑥갓의 꽃에서 분리한 sesquiterpene lactones의 항균활성
하태정,한효심,장기창,장대식,조동령,양민석,이경동,Ha, Tae-Jung,Han, Hyo-Shim,Jang, Ki-Chang,Jang, Dae-Sik,Cho, Dong-Young,Yang, Min-Suk,Lee, Kyung-Dong 한국응용생명화학회 2003 한국농화학회지 Vol.46 No.3
Thirteen sesquiterpene lactones isolated from the flower of Chrysanthemum coronarium L., which has been widely cultivated in Korea as a vegetable for a long time, were investigated their antimicrobial activities against eight bacteria and five phytopathogenic fungi. The antimicrobial activities of dihydrochrysanolide (6) and 1-epi-dihydrochrysanolide (7) showed strong activities against all the bacteria such as Bacillus subtilis, Bacillus cereus, Staphylococcus aureus and Vibrio parahaemolyticus. Especially, Staphylococcus aureus was investigated that have very strong antibacterial activity to $1.56\;{\mu}g{\cdot}disc^{-1}$, respectively. Also, most of sesquiterpene lactones, which have ${\alpha}-methylene-{\gamma}-butyrolactone$ group, were exhibited strong activity to Gram(+) bacteria than Gram(-) bacteria. In the antifungal test, Rhizoctonia solani and Phytophthora capsici known as phytopathogenic fungi have exhibited all extensive activity about compounds that have ${\alpha}-methylene-{\gamma}-butyrolactone$ group. 쑥갓(Chrysanthemum coronapium L.)의 꽃에서 분리한 13개의 sesequiterpene lactone들에 대한 생리활성 실험의 일환으로, 세균 8종과 곰팡이 5종을 이용하여 항미생물 활성을 검토하였다. 그 결과, 항세균 실험에서 Gram 양성균인 Bacillus subtilis, Bacillus cereus, Staphylococcus aureus 균들과 Gram 음성균인 Vibrio parahaemolyticus균이 쑥갓에서 분리된 13종의 화합물들에 대하여 광범위한 활성을 나타내었으며, 이들 중에 dihydrochrysanolide 유도체가 Staphylococcus aureus균에서 $3.1\;{\mu}g{\cdot}disc^{-1}$이하의 강한 항세균 활성을 보였다. 항진균 실험에서는 ${\alpha}-methylene-{\gamma}-butyrolactone$ group을 가진 화합물들이 Rhizoctonia solani와 Phytophthora capsici에 대해 강한 항진균 활성이 조사되었다.
하태정,Ha, Tae-Jeong 한국광산업진흥회 2001 광산업정보 Vol.6 No.-
닷컴기업들의 몰락, 이동 통신 분야의 투자지연,경기 하락 등에서 촉발된 통신기기 산업의 침체는 3세대 서비스 상용화에 의한 신규 투자수요 발생과 통신기기 회사들의 강도 높은 구조 조정에 의한 공급 과잉 문제가 해소된 이우에야 회복이 가능할 것으로 보인다.
지칭개(Hemisteptia lyrata) 꽃의 성분연구(I)
하태정,이경동,이종록,이준,박기훈,양민석,Ha, Tae-Joung,Lee, Kyung-Dong,Lee, Jong-Rok,Lee, Jun,Park, Ki-Hun,Yang, Min-Suk 한국생약학회 2001 생약학회지 Vol.32 No.3
The leaves and flowers of Hemisteptia lyrata Bunge (Compositae) have been used for cure sour throat and treat tumors in traditional chinese medicine. As a result of the chemical investigation, two compounds were isolated from the $CHCl_3$ extract of the flowers of H. lyrata. On the basis of spectroscopic experiments, their structures were identified as 8-hydroxy-3-keto-10(14)-guaien-12,6-oxide (Isoamberboin) and 3,8-dihydroxy-4(15),10(14),11(13)-guaiatrien-12,6-oxide (8-Hydroxyzaluzanin C). They were first isolated from the genus Hemisteptia.