초임계 이산화탄소를 이용하는 친환경 공정에 의한 다공성 고분자의 제조

강세란,홍성수,이민규,이석희,천재기,주창식 한국환경과학회 2004 한국환경과학회지 Vol.13 No.3

An experimental study on the preparation of monolithic porous polymers by environmentally friend process in supercritical carbon dioxide has been carried out. Polymerization mixture composed of a cross-linking monomer, initiator and functional co-polymer was charged in the reactor with sapphire window. After the system was purged with a flow of CO₂ for 15 min, the reactor was pressurized with liquid CO₂ up to 100 bars. The reactor was isolated from and placed back to the system via quick connector for shaking until the mixture had become fully homogeneous. The reactor was then heated and pressurized to the required reaction conditions and left overnight. After cooling and CO₂ evacuation, the polymer was removed from the reactor as dry, white, continuous monoliths. The effect of experimental conditions on the physical properties of porous polymer was systematically examined, and it was found that monomer content had a major effect on the physical properties of the polymers.

선박용 폐 FRP 수지의 재활용 공정 개발

강세란,김영우,황덕기,김시영,이민규,주창식 한국환경과학회 2003 한국환경과학회지 Vol.12 No.6

A recycling process for the waste FRP from boats was developed. The recycling process is composed of decomposition of waste FRP with propylene glycol and synthesis of recycled unsaturated polyester resin from the decomposed liquid material. Prior to the decomposition, waste FRP was cut into 2cm × 5cm segments and mechanical impact was applied by press roller to give gaps between cumulated laminates. Propylene glycol effectively decomposed the waste FRP segments and glass fibers were easily separated from decomposed liquid material. Recycled unsaturated polyester resin could be made from the decomposed liquid material by reaction with maleic anhydride and phthalic anhydride.

광중합 시 수종의 심미적 수복재와 이장재의 사용에 따른 치수내 온도변화

장혜란,이형일,이광원,이세준 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.5

Polymerization of light-activated restorations results in temperature increase caused by both the exothermic reaction process and the energy absorbed during irradiation. Within composite resin, temperature increases up to 20℃ or more during polymerization. But, insulation of hard tissue of tooth lowers this temperature increase in pulp. However, many clinicians are concerned about intrapulpal temperature injury. The purpose of this study was to evaluate temperature changes in the pulp according to various restorative materials and bases during curing procedure. Caries and restoration-free mandibular molars extracted within three months were prepared Class I cavity of 3×6mm with high speed handpiece fissure bur. 1mm depth of dentin was evaluated with micrometer in mesial and distal pulp horns. Pulp chambers were filled with 37.0 ±0.1℃ water to CEJ. Chromium-alumina thermocouple was placed in pulp horn below restorative materials for evaluating of temperature changes. This thermocouple was connected to temperature-recording device(Multifunction analyzer MX, 6.000, JAPAN). Temperature changes was evaluated from initial 37.0℃ after temperature changes to 37.0℃. Tip of curing unit was placed in the center of prepared cavity separated 1mm from restorative materials. Curing time was 40s. The restorative materials were used with Z 100, Fuji II LC, Compoglass flow and bases were used with Vitrebond. Dycal. Resrorative materials were placed in 2mm. The depth of bases were formed in 1mm and in this upper portion, resin of 2mm depth was placed. This procedure was performed 10 times. The results were as follows : 1.All the groups showed that the temperature in pulp increased as curing time inceased 2.The temperature increase of glass ionomer was significantly higher than that of Resin and Compomer during curing procedure (P<0.05). 3.The temperature increase In glass ionomer base was significantly higher than that of Calcium hydroxide base during Resin curing procedure (P<0.05).

공공도서관 유아열람실의 실내공간특성에 관한 연구

전세란;심재희;황연숙 한양대학교 2008 韓國 生活 科學 硏究 Vol.28 No.1

Reading plays a large part in emotional and intellecutal growth of children. For that reason, infants' reading rooms have emphasized the cultural and educational function for the children recently. This research analyzed spatial arrangement features and interior design of infants' reading rooms in five public libraries through case studies. The results are as follows: First, infants' reading rooms are consists of data storing area, office area, reading area and convenience area. Second, infants' reading rooms generally have bookcases around the walls and the reading space, tables, and stools in the middle. Third, reading rooms lack elements that could make them fun and interesting to children. In conclusion, infants' reading rooms in public libraries, should consider the furniture arrangements, interior designs.

The effects of antibiotics on the reproductive physiology targeting ovaries in the Asian tiger mosquito, Aedes albopictus

Ha Young‐Ran,Jeong Se‐Jin,Jang Chang‐Won,Chang Kyu‐Sik,Kim Hyun‐Woo,Cho Shin‐Hyoung,Lee Hee‐Il 한국곤충학회 2021 Entomological Research Vol.51 No.2

Mosquitoes have adapted to various environmental conditions. Symbionts with mosquitoes impact this adaptation in different environments. In the field, mosquitoes could get exposed to antibiotics during their developmental period, which could reduce or eliminate their symbiotic microbes. However, the side effects of the antibiotics on the ovary and reproductive physiology of the Asian tiger mosquito, Aedes albopictus remains unknown. In this study, we investigated the effects of tetracycline and combinations of rifampicin and tetracycline at environmentally acceptable levels on the reproductive physiology of ovaries in Ae. albopictus. Rifampicin and tetracycline in combination reduced the hatching rate and fertility of Ae. albopictus compared to the untreated control group. These antibiotics induced histopathological damage and reactive oxygen species production in the ovaries. The combination of antibiotics decreased the expression of surface protein of Wolbachia (WSP) in Ae. albopictus. Additionally, the expression of Toll like receptor 2 (TLR2) and Myd88 were triggered by the combinations. The findings demonstrate the detrimental effects of antibiotics, particularly combinations of rifampicin and tetracycline, on the reproductive capacity of Ae. albopictus females.

제강슬래그를 이용한 선행재하 공법에 관한 연구

이계학,오세란 호남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.8 No.-

Pre-Loading공법의 재하재로서 제강슬래그의 활용방안을 모색하기 위해, 건설현장에 적용하여 다음과 같은 결과를 얻었다. 제강슬래그가 일반토사보다 단위중량이 크기 때문에 재하고를 줄일 수 있어서 공사비의 절감효과가 있으며, 제강슬래그를 사용함으로써 무분별한 토취장 개발에 따른 환경파괴를 최소화 할 수 있다. 제강슬래그의 전단저항각이 크기 때문에 지지력이 좋아서 우천시에도 작업이 가능하므로 공기를 단축할 수 있다. 제강슬래그를 Pre-Load 재로서 사용할 경우 단면의 설계방법으로 ①제강슬래그만을 사용하여 Pre-Load 단면설계, ②Scale의 유입을 차단하는 토사층을 Pre-Load 단면의 일부로 설계,③Membrace층에 의한 scale 차단, ④수평배수재층을 입도조정한 제강슬래그로 설계하는 방법을 제안하였다. Steel making slag as pre-load material was applied to a construction job-site and its application was examined. The result are as follows : Construction cost is decreased because the unit weight of steel making slag is higher than that of soil and the hight of pre-load meterial is reduced. And environmental damages caused by developing borrow-pits could be minimized by utilization of steel making slag. Construction period can be shortened because pre-loading could be continued in spite of raining by virtue of increased bearing capacity of slag whose internal friction angle is bigger than that of soil. In utilization of steel making slag as a pre-load material, four methods for section design are proposed ①use of steel making slag, ②way of a earth layer which inflow scale is intercepted if portion, ③method of scale is intercepted with membrane layer, ④use of steel making for horizontal drain.

인삼의 polyacetylene 성분 PQ-6의 분리

류재하,장세란 숙명여자대학교 약학연구소 1998 약학논문집-숙명여자대학교 Vol.15 No.-

C-17 polyacetylene compound was isolated from the roots of Panax ginseng. Its structure was determined by 'H-NMR, ^(13)C-NMR and 'H-'H COSY spectra as PQ-6 (C_(19)H_(26)O_(4); 8- acetoxy-9,10-epoxy-heptadeca-l-ene-4, 6-diyne-3-ol). This compound was previously reported from Panax quinquefolium, but purified from Panax ginseng firstly at this time. PQ-6 from ginseng showed the strong inhibitory activity of nitric oxide synthesis in LPS-activated macrophages. The IC_(50) value of this activity was 1.5㎛.

도로 노면의 형상과 강우의 임계 지속시간을 고려한 적정 우수 유출량 산정 및 영향분석

이종태,김영란,김갑수,윤세의,박영민 대한상하수도학회 2003 상하수도학회지 Vol.17 No.2

When calculating the storm runoff from road surface, it is recommendable to introduce the critical duration of rainfall by means of the RUNOFF (SWMM) model, or the Rational method with the travel time values of the kinematic wave' or Kerby's equation modified by multiplying the correction factor of 2.3 or 1.1, respectively. But the travel time of 5-10 minutes suggested in the Guide Manual for Sewer Design is too long to use for calculating road surface runoff. The peak runoff rate increases as the road sectional slope increases, whereas it shows the opposite results for an increase in the longitudinal slope. Also, the effects of the width and length of the road on the surface runoff rates increases greatly, as their values increase.

국산·수입산 동부를 이용한 모시잎송편의 영양성분비교

김영섭,김소민,오지연,황진봉,이기택,신정아,김상천,김세나,김행란,황영,최용민 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.2

보리순의 영양성분 조성

서혜지,최용민,김상천,이준수,이기택,정명근,천지연,황진봉,남진식,서우덕,황영,김행란,김세나 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.2