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Song, Hoon Sub,Kwon, Soon Jin,Epling, William S.,Croiset, Eric,Nam, Sung Chan,Yi, Kwang Bok The Korean Society of Clean Technology 2014 청정기술 Vol.20 No.2
합성가스를 생산하기 위한 부분산화, 이산화탄소 리포밍, 메탄에 의한 산화$CO_2$ 리포밍 공정들은 니켈 하이드로탈사이트($Ni_{0.5}Ca_{2.5}Al$) 촉매를 이용하여 수행되었고 안정한 이중층 구조를 형성시키기 위한 금속지지체(Mg, Ca)의 영향에 대해서도 다양한 연구가 진행되었다. 지지체전구물질(Mg, Ca)에 따라 메탄 리포밍의 안정성은 활성니켈이온과 지지체금속이온 사이의 결합강도차이에 의해 영향을 받는다. Ni-Mg-Al 구성체는 가장 안정한 하이드로탈사이트 이중층 구조이지만 Ni-Ca-Al 구성체는 그렇지 않다. 이산화탄소 리포밍 장기테스트에서 Ni-Mg-Al 촉매는 약 100시간 동안 80%의 효율을 유지하면서 탁월한 안정성을 보였지만 Ni-Ca-Al 촉매는 반응초기에 불활성화됨을 확인할 수 있었다. 활성금속 Ni과 지지체 Mg-Al 사이의 결합강도를 확인하기 위해 승온 환원(temperature-programmed reduction, TPR) 분석을 시행하였다. 이를 통해 Ni-Mg-Al 촉매가 Ni-Ca-Al 촉매보다 Ni의 환원온도가 더 높음을 확인할 수 있었다. $Ni_{0.5}Ca_{2.5}Al$ 촉매는 가장 높은 초기반응성을 보였지만 코크형성으로 인해 반응성이 빠르게 감소하였다. 결론적으로 $Ni_{0.5}Ca_{2.5}Al$ 촉매가 코크형성에 대한 강한 저항성을 갖고 있기 때문에 다른 촉매들보다 높은 반응성과 안정성을 갖는 것으로 보여진다. Partial oxidation, $CO_2$ reforming and the oxidative $CO_2$ reforming of $CH_4$ to produce synthesis gas over supported Ni hydrotalcite-type ($Ni_{0.5}Ca_{2.5}Al$ catalyst) catalysts were carried out and the effects of metal supports (i.e.; Mg and Ca) on the formation of a stable double-layer structure on the catalysts were evaluated. The $CH_4$ reforming stability was determined to be affected by the differences in the interaction strength between the active Ni ions and support metal ions. Only a Ni-Mg-Al composition produced a highly stable hydrotalcite-type double-layered structure; while the Ni-Ca-Al-type composition did not. Such structure provides excellent stability for the catalyst (-80% efficiency) as confirmed by the long-term $CO_2$ reforming test (-100 h), while the Ni-Ca-Al catalyst exhibited deactivation phases starting at the beginning of the reaction. The interaction strength between the active metal (Ni) and the supporting components (Mg and Al) was determined by temperature-programed reduction (TPR) analyses. The affinity was also confirmed by the TPR temperature because the Ni-Mg-Al catalyst required a higher temperature to reduce the Ni relative to the Ni-Ca-Al catalyst. The highest initial activity for synthesis gas production was observed for the $Ni_{0.5}Ca_{2.5}Al$ catalyst; however, this activity decreased quickly due to coke formation. The $Ni_{0.5}Ca_{2.5}Al$ catalyst exhibited a high reactivity and was more stable than the other catalysts because it had a higher resistance to coke formation.
국내 우주 중점기술 개발 동향 (Ⅱ) - 스페이스파이오니어사업 중심으로
송복섭(Song, Bok-sub),석병석(Suk, Byong-suk),박신무(Park, Shin-mu),심영주(Shim, young-joo),용상순(Yong, Sang-soon),유명종(Yu, Myoung-jong) 한국항공우주연구원 2023 항공우주산업기술동향 Vol.21 No.2
스페이스파이오니어사업(′21∼′30)은 국가 우주전략기술을 자립화하고 원천기술을 확보하고 국가 우주기술 역량향상 및 우주산업 생태계 선순환 기반을 마련한다는 목표로 추진되고 있다. 2021년부터 2030년까지 약 10년간 발사체(3), 위성본체(7), 위성탑재체(6) 분야의 총 16개 우주중점기술을 선정하고 개발하여, 사업 목표인 세부과제 연구개발성과물의 각 연계대상 체계(다목적/차세대/정지궤도 위성 및 소형발사체 등) 연계하고자 한다. 2023년 9월 발사체 3개, 위성본체 7개, 위성탑재체 4개 과제로 14개 과제가 진행 중으로 본 논문에서는 스페이스파이오니어사업에서 진행 중인 우주중점기술 개발 현황에 대해 기술하고자 한다. Space Pioneer Program(′21∼′30) began at March 2021 in order to develop space key technology. The program was specially designed not only try to develop space key technology successfully but also to apply each results to actual domestic space projects. Currently total 14 projects are working now and they are consist of 3 projects for launch vehicle, 7 projects for satellite BUS and 4 projects for satellite payload. The most satellite projects try to overcome or substitute export control issue. And most launch vehicle projects try to develop key technology essential to small launch vehicle. This paper introduces the development status and technical performance of each projects.
Yoo, Bo-Im,Ahan, Kwang Bok,Kang, Min Hee,Moon, Dong-Cheul,Kwon, Oh-Seung,Lee, Hong Sub,Ryu, Jung Su,Kim, Tae Yong,Song, Sukgil,Chung, Youn Bok Pharmaceutical Society of Japan 2005 Biological & pharmaceutical bulletin Vol.28 No.4
<P>We investigated the pharmacokinetic characteristics of 11-hydroxyaclacinomycin X (ID-6105), a novel anthracycline, after intravenous (i.v.) bolus administration in rats and beagle dogs. We developed an HPLC-based method to analyze ID-6105 levels in plasma, bile, urine, feces, and tissue homogenates and validated the method in a pharmacokinetic study. The plasma concentration of ID-6105 decreased to below the quantifiable limit (0.02 μg/ml) at 4 and 8 h after i.v. administration in rats at doses of 2 and 10 mg/kg, respectively (<I>t</I><SUB>1/2,α</SUB> and <I>t</I><SUB>1/2,β</SUB> of 0.78 and 17.8 min at a dose of 2 mg/kg, 0.91 and 176 min at a dose of 10 mg/kg, respectively). The <I>AUC</I> increased with nonlinear pharmacokinetics following the dosage increase from 2 to 10 mg/kg in rats, while the pharmacokinetics were not significantly altered in beagle dogs following a dosage increase from 0.5 to 2.5 mg/kg. Of the various tissues tested, ID-6105 was mainly distributed in the lung, spleen, kidney, adrenal gland, and liver after i.v. bolus administration. ID-6105 levels in the lung or kidney 2 h after i.v. bolus administration were comparable to the initial plasma concentration. However, the ID-6105 concentrations in various tissues 48 h after i.v. bolus administration became too small to measure. The cumulative amounts of ID-6105 found in the bile 48 h after the administration of 2 and 10 mg/kg were calculated to be 26.7 and 18.5% of the initial dose, respectively. The corresponding values in the urine 72 h after i.v. administration were 4.33 and 3.07% of the initial dose, suggesting that ID-6105 is mostly excreted in the bile. In conclusion, our observations indicate that ID-6105 was rapidly cleared from the blood and transferred to tissues such as the lung, spleen, kidney, and liver 2 h after i.v. bolus administration. Moreover, the majority of ID-6105 appears to be excreted in the bile by 24 h after i.v. bolus administration.</P>
사람 태아간의 산호성 과립백혈구형성에서 산호성 과립형성에 대한 미세구조 연구
송재섭,김경용,이원복,김동창 중앙대학교 의과대학 의과학연구소 1992 中央醫大誌 Vol.17 No.4
The developmental processes of eosinophilic granule formation were ultrastructural investigation of eosinophilic granulopoiesis in 15 cases of human fetal livers from 8 to 34 weeks of gestation. 1) Numerous vesicles, microgranules and small agranular and granular vacuoles were distributed around the distended Golgi apparatus in myeloblast and eosinophilic promyelocyte. 2) Granular matrix of vacuoles contained small granular vacuoles, serveral vesicles and mutilamellar structures. The granular substance exhibited higher electron density than that of cystic rough endoplasmic reticulum(RER) and was similar partly to that of immature eosinophilic granules. 3) Distended cystic RER was fused to produce matrix of maturing granules with granular vacuoles and immature eosinophilic granules. 4) Immature eosinophilic granule which began to be produced in eosinophilic promyelocyte, had myelin sheath-like structure and debris of vesicles and granular vacuoles and those disappeared immediately. The charicteristic crystalloid inclusions began to develop in immature eosinophilic granule of myelocyte. In summary, it is suggested that vesicles and granular vacuoles as well as RER in the myelocyte and promyelcyte are participating in the formation of immature eosinophilic granules which become mature with the appearance of charicteristic crystalloid inclusion
Hyo Sub Jun,In Bok Chang,JunHyong Ahn,Joon Ho Song 대한뇌혈관외과학회 2016 Journal of Cerebrovascular and Endovascular Neuros Vol.18 No.4
Cases of spontaneous regression of cerebral aneurysm remnant after incomplete surgical clipping have been rarely reported. This paper reports the regression of an aneurysm remnant after incomplete surgical clipping during postsurgical follow-up. A 50-year-old male presented with subarachnoid hemorrhage because of rupture of an anterior communicating artery aneurysm. An emergency clipping of the aneurysm was performed. A cerebral angiography, which was performed two weeks postoperatively, revealed an aneurysm remnant. The patient refused additional treatment and was discharged without apparent neurological deficit. One-year follow up cerebral angiography demonstrated a partially regressed aneurysm remnant.