광도와 온도가 가시광선 중합형 치과용 레진의 중합에 주는 영향

이종근,최주열,임범순,신현철 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4

본 연구에서는 2종의 다이메타크릴레이트 치과용 레진 (urethane dimethacylate, UDMA와 bisphenol A glycerolate dimethacylate, Bis-GMA)이 광중합 반응하는 과정에서 변화되는 물성을 동역학분석법 (dynamic mechanical analysis, DMA)으로 관찰하였다. 광중합에 사용한 가시광선 (λ=400-500 nm)의 광도는 20 mW/㎠에서 70, 120, 300 및 600 mW/㎠로 변화시켜 그에 따른 저장탄성율 (storage modulus, G')과 손실탄성율 (loss modulus, G")의 변화를 측정하였고, 측정온도도 25 ℃에서 37, 50 및 60 ℃로 변화시켜 온도가 중합과정에 주는 영향을 관찰하였다. 광조사 시간은 모든 시편에 대하여 측정 시작 직후 30초로 일정하게 하였다. 각 조건에서 측정한 G' 과 tan δ (=G"/G') 결과를 이용하여 겔화 (gelation)와 유리화 (vitrification) 전이시점 (transition point)을 결정하였으며, 이를 이용하여 TTIT (Time-Temperature-Intensity-Transformation) 중합 도표를 작성하였다. 이 중합도표를 보면 광도 변화가 온도 변화보다 중합반응에 더 민감하게 영향을 주었으며, 특히 광도는 겔화보다 유리화에 훨씬 크게 영향을 주는 것을 알 수 있었다.

암세포주에 대한 우황 50% MeOH 엑스와 함암제의 병용효과

殷載淳,康城溶,韓宗鉉 又石大學校 1994 論文集 Vol.16 No.-

The studies were conducted to investigate the combined effects of 50% MeOH extract of Be-zoar Bovis(MEB) and several anti-tumor drugs. The effects of MEB and several anti-tumor druge on the proliferation of HaLa, Hep G2, SNU-1, MOLT-4 and S 180 cells estimated by MTT colorimetric assays. MEB inhibited the proliferation of HeLa, Hep G2, SNU-1, MOLT-4 and S 180 cell. The inhibitory action of mitomycin C(MMC), cisplatin(CPT) or 5-fluorouracil(5-FU) on the proliferation of HeLa cell was increased by the combined of MEB and their drugs, and the inhibitory action of MMC or CPT on the proliferation of Hep G2 and S 180 cell was increased by the treatment of MEB and their drugs. MEB inhibited the proliferation of Balb/c 3T3 and Tlymphocyte at 10^-4g/ml. The 50% inhibitory concentration of MMC, CPT and 5-FU on T lymphocyte were 0.75, 0.57 and 28.35㎍/ml repectively. The inhibitory activity of MMC, CPT or 5-FU treated group, respectively, on the proliferation of T lymphocyte was increased by the combined treatment MEB and their drugs. MEB increased the number of leukocyte at 5th day. In the groups of the combined treatment of MMC and MEB, the number of leukocytes and the weight of thymus were increased significantly than MMC treated group. MEB increased the number of total peritoneal cells and inbibited the exudation of evans blue into peritoneum. In conclusion, this paper suggest that MEB inhibits the proliferation of HeLa, Hep G2, SNU-1, MOLT-4 and S 180 cells, and the combined treatment of anti-tumor drugs and MEB increase the inhibitory activity of their drugs on several tumor cells. MEB has the possibility of decreasing the side effect of anti-tumor drugs such as leukopenia and immunsuppression.

부산시 공동주택 폐기물의 발생특성 및 비용분석

정대순,이종현,박태주 부산대학교 환경문제연구소 1999 環境硏究報 Vol.17 No.1

This study was conducted to evaluate the solid waste characteristics and collection and transportation cost in apartment buildings in Pusan city. Eight apartments at six districts were selected as survey area for this study and sample waste generated from apartment buildings were collected three times. Solid waste generation rate of apartment building was 0.68 ~0.81 kg/capita · day which is lower than average generation rate in Pusan city and the whole country. Composition of apartment buildings wastes were papers 20.9%, foods; 48.8%, plastics; 5.0%, miscellaneous organic solids; 9.9%, respectively. Incombustible materials such as, glass and ceramics, metals and ashs were found in the range of 0.7% to 20.7% of the solids. Collection and transportation cost per kg of refuge were varied in the range of 60.3~76.9 won. Crew size, container location. type of truck, collection route and travel time were significant factors in determining the cost of waste collection.

김천산 자두의 성분과 그 특성

김순희,강병태,박동철,윤옥현,이재우,한만덕,최종동 동아시아식생활학회 2000 동아시아식생활학회지 Vol.10 No.1

Physicochemical properties and chemical compositions of two plums (Oishiwase, Formosa) produced in Kimcheon area were investigated. Chemical compositions of two plum cultivars were similar except nitrogen free extract(NFE). NFE value of Formosa was higher than Oishiwase. Alcohol insoluble substance content, total soluble pectin, total sugar content and total organic acid content of Oishiwase were 2.08%. 14,16%, 5.07% and 949.16mg%, respectively. In case of Formosa cultivar, those were 50%, 15.42%, 5.91% and 985.91mg%, respectively. Fructose content among free sugars of two plum cultivars range from 3.97~3.45% and the other were glucose, sucrose and inositol, 1.83~1.53%, 0.08~0.05% and 0,04~0.039%, respectively. Malic acid content was 35~373mg% and others were levulinic acid, lactic acid, citric acid, succinic acid and fumaric acid in the decreasing order.

센서를 위한 SOI MOSFET

양천순,이종현 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1

Recently the single crystalline silicon-on-insulator(SOI) structures have attracted a special interest for its perfect isolation. Oxidation of porous silicon is one of the very good prospects in the field of integrated circuits and solid-state transducers. Selective porous silicon layer(PSL) was formed in the n^(+) region of an n/n^(+)/n silicon structure using the FIPOS(full isolation by porous oxidized silicon) technique. And MOS devices were fabricated on insulated single crystal silicon islands. SOI structures are fabricated at room temperature by anodic oxidation of PSL. At the end step of IC fabrication process, device isolation by the SOI structures will be achieved by these new techniques here proposed.

고등학교 계열별 학업 성취도에 관한 연구

강현중,박종순 瑞逸大學 1999 論文集 Vol.17 No.-

근래들어 2년제 대학(전문대학)의 입학에 실업계 출신 학생들의 정원 비율이 높아지고 있다. 특별전형의 방법이 다양해지고 정원도 늘면서 전체 입학생 중 실업계 고교 출신자들의 비율이 늘고 있는 것이다. 전문대학이 중견 전문기술인의 양성을 목표로 하고 있기 때문에 이는 바람직한 방향으로 볼 수도 있으나 다른 한편으로 실업계 출신 학생들의 학업 성취도가 일반계 고교 출신 학생들보다 낮다고 생각하며 우려하는 시각이 있는 것도 사실이다. 이러한 관점에서 실제로 실업계 고교 출신 학생들과 일반계 고교 출신 학생들의 학업 성취도에 차이가 있는 지를 알아보기 위해 본교의 재학생을 대상으로 간단한 실험적 분석을 하였다.

수소손상 검출과 평가기술

원순호,현양기,이종오,조경식,이재도 한국비파괴검사학회 2002 한국비파괴검사학회지 Vol.22 No.1

산업현장에서 수소는 설비를 손상시킬 수 있는 주원인 중의 하나이며, 종종 설비를 파괴시키는 사고를 발생시킨다. 수소손상에 의한 결정립계의 공동 또는 미세균열은 강재의 파괴인성과 강도를 떨어뜨리는 원인이 되고, 따라서 과거 제한적인 방법으로 수소손상을 평가하기 위한 시도가 수행되었다. 본 연구에서는 초음파를 적용하여 수소손상을 검출하고 평가하기 위한 연구를 수행하였다. 미세조직시험에 의해 확인된 시험편을 이용하여 초음파의 속도와 감쇠계수를 구한 결과, 수소손상에 의해서 초음파 속도는 감소하고 감쇠는 현저하게 증가하는 것으로 나타났다. 이러한 결과를 바탕으로 수소손상을 검출하기 위한 신뢰성 있는 평가법을 제시하였다. The presence of hydrogen in industrial plants is a source of damage. Hydrogen attack is one such form of degradation and often causing large tube ruptures that necessitate an immediate shutdown. Hydrogen attack may reduce the fracture toughness as well as the strength of steels. This reduction is caused partially by the presence of cavities and microcracks at the grain boundaries. In the past several techniques have been used with limited results. This paper describes the application of an ultrasonic velocity and attenuation in hydrogen damage. Ultrasonic tests showed a decrease in wave velocity and an increase in attenuation. Such results demonstrate the potential for ultrasonic nondestructive testing to quantify damage. Based on this study, reliable recommendation is suggested to detect hydrogen attack.

임신 종결 후 발생한 자궁 동정맥 누공에서 자궁동맥색전술로 치료한 1예

김종민,이해혁,김태희,남계현,심일구,이권해,김형문,이임순,장종호 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Arteriovenous fistula of uterus is rarely reported disease. This vascular malformation is very dangerous condition because Dilatation & curettage can cause massive uterine bleeding without accurate diagnosis. The diagnosis is made by angiography, gray scale ultrasonography, color and duplex doppler ultrasonography, computed tomography, and magnetic resonance imaging is helpful. Especially color and duplex doppler ultrasonography is allows convincing detection and diagnosis of arteriovenous fistula. Recently transcatheter uterine artery embolization is treatment of choice. We have experienced a case of arteriovenous fistula of uterus. Which is presented with a brief review of literature.

核家族과 直系家族 主婦의 憂鬱性向 比較硏究

최승순,김현우,김정근 大韓神經精神醫學會 1987 신경정신의학 Vol.26 No.4

Korea has changed from an agricultural to an industrial society, and with this change have come many others. Among them the family style is being changed from the stem family to the nuclear. Housewife many manifest a variety of psychiatric problems, including depression which was used as an index of a psychopathology of the housewives in this study, stemming from the mother-in-law/daughter-in-law conflict. Author investigated whether mother-in-law/daughter-in-law conflict presents or ??t, using Zung's SDS-score of the housewife by the family style. The results are as follows; 1) There was no significant difference in the depressive trait of the housewives by the family style without thinking of the other variables affecting depression & subject population's characteristics. 2) Occupation, disease, economic status change state after marriage , mother-in-law's satisfaction degree with daughter-in-law,relationship between mother-in-law and husband, maturity of husband present economic status, mother-in-law's educational backgroun were the significant variables affecting the depressive trait of house-wife. 3) There was no association between the family style and the variable affecting the depressive trait of housewife. 4) The SDS-score of stem family's housewife was higher than the nuclear when correcting the economic status, which suggests mother-in-law/ daughter-in-law conflict present in the general population.

심실중격결손증-치험 1예-

조광현,우종수,황윤호,이양행,박철호,김종성,김철호,이경순,조영일,박태인 인제대학교 1985 仁濟醫學 Vol.6 No.4

A successful treatment of infants and children with congenital heart defects depends upon several factors: diagnosis must be accurate, the operative technique, including techniques of perfusion and myocardial preservation, must be suited to the needs of patients and intensive cares, including accurate anesthesia, must be applied through all stages of investigation and treatment, i.e. before, during and after the operation. Recently we performed a open heart surgery successfully for a six-years old girl who had suffered from frequent upper respiratory tract infection and mild to moderate exertional dyspnea with congenital heart defects (ventricular septal defect, Kirklin type II, with patent foramen ovale). The operation and postoperative course were very smooth. And now we report this with review of literatures.