• Composites Research
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• 제30권6호
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• pp.350-355
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• 2017

Phenylcyclohexyl (PCH) mesogen을 diglycidyl terephthalate의 2,5 위치에 치환시킨 새로운 액정성 에폭시 수지를 설계하였다. 이 물질의 액정성은 DSC(differential scanning calorimetry)와 POM(polarized optical microscopy)으로 분석하였다. 모든 액정성 에폭시 유도체는 가열 및 냉각 시에 모두 smectic상을 나타내는 enantiotropic한 성질을 나타내었다. 액정성 에폭시의 공융 혼합물을 통하여 액정 온도구간을 확장시켰다. 경화된 신규 액정성 에폭시는 $0.4W{\cdot}m^{-1}{\cdot}K^{-1}$의 높은 열전도도를 나타냈다. 높은 열전도도를 갖는 신규 액정성 에폭시는 전자 및 디스플레이용 복합소재로 이용될 것으로 기대된다.

• Archives of Plastic Surgery
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• 제36권1호
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• pp.113-117
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• 2009

Purpose: Although Hydrofluoric acid(HF) is not a strong acid when compared to other hydrogen halides, it is a feared corrosive and is particularly dangerous at higher concentrations. HF burns are characterized by symptoms, often delayed and localized with diluted HF solutions, to include erythema, edema and severe pain. Pain, a well known symptom following exposure to calcium binding. And, EMLA$^{(R)}$ cream is a topical formulation based upon the eutectic mixture of lidocaine and prilocaine and is used in clinical settings to provide pain relief undergoing superficial surgical procedures. The aim of this study is to evaluate effects of EMLA$^{(R)}$ cream, pain - control dressing on the treatment for HF injury wound. Methods: From June 2007 to June 2008, this study was carried out with 10 patients who had HF partial thickness burns. We were applied topically EMLA$^{(R)}$ cream to injured wound with vaseline gauze and 10% calcium gluconate wet gauze dressings. As a principle, in the emergency treatment, partial or complete removal of the bullae along with copious washing with normal saline was done, depending on the degree of HF invasion of the distal digital extremities. The effect of dressing was investigated by visual analogue pain scale. Results: We therefore reviewed 10 cases of HF - induced pain and pain relief treatment principle. The 10 cases who came to the hospital nearly immediately after the injury healed completely without sequelae and EMLA$^{(R)}$ related complications. Conclusion: Proper initial treatment of HF burns are important, if not promptly recognized and properly treated, for produce serious injury. Topical EMLA$^{(R)}$ cream remain a powerful, new advancement for minimizing HF - related pain during dressing procedures. When used appropriately, topical EMLA$^{(R)}$ cream can provide a safe and effective alternative to other forms of HF - pain control treatment.

• 대한기계학회논문집B
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• 제34권12호
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• pp.1093-1099
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• 2010

초고온원자로(VHTR) 설계에 있어 중간열수송루프(IHTL) 및 중간열교환기(IHX) 설계는 고온의 운전조건($950^{\circ}C$ 이상)으로 인하여 공학적으로 어려운 과제 중 하나로 알려져있다. 본 연구에서는 LiF, NaF 및 KF(46.5:11.5:42.0 mole %)의 공융혼합물인 Flinak molten salt 를 IHTL 의 열수송매체로 고려하였다. Flinak molten salt 의 세관에서의 열수력 특성을 평가하기 위하여 직경이 1.4 mm 인 원형관을 이용하여 고온의 가스와 Flinak 을 열교환할 수 있는 이중관식 열교환기를 구성하여 실험하였다. 실험 결과 층류유동에서 측정된 Flinak 의 마찰계수는 이론식인 64/Re 에 근접하였고 Nusselt 수는 일반적으로 3.66 에서 4.36 범위에 들었다.

• Journal of Yeungnam Medical Science
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• 제11권2호
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• pp.270-276
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• 1994

최근 소아과 영역에서 통증 완화를 위해 사용되기 시작한 통증 완화용 연고 제재인 EMLA를 영아의 예방 접종시에 사용함으로써 영아의 통증 완화 효과를 알아 보기 위해 영남대학교 의과대학 부속병원 육아 상담실에서 DPT 예방 접종을 시행한 2개월에서 8개월 사이의 영아 80명을 대상으로 하여 통증 완화용 연고제를 사용한 40례(남아 25례, 여아 15례)와 사용하지 않은 40례(남아 21례, 여아 19례)로 나누어 비교 관찰하였다. 통증에 대한 반응을 McGrath's face scale과 Oucher pain scale, MBPS로 비교 관찰하였으며, 접종후 울음 시작 시간, 첫 울음 지속 시간, 총 울음지속 시간 등을 비교하여 다음과 같은 결과를 얻었다. 1) 대상 환아의 성별이나 연령의 분포상의 차이가 보이지 않았다.(EMLA 사용군의 평균 연령 : $4.0{\pm}0.2$개월, 대조군 : $4.5{\pm}0.8$개월) 2) 통증의 정도는 McGrath's face scale(p<0.05), Oucher pain scale(p<0.05), MBPS(p<0.01)을 이용하여 측정한 결과 EMLA 사용군에서 대조군에 비해 유의한 통증의 감소를 볼 수 있었다. 3) 주사후 첫 울음 시작 시간의 경우 EMLA 사용군에서도 $2.1{\pm}1.3$초, 대조군에서도 $2.0{\pm}0.9$초를 보여 차이가 없었으나, 평균 첫 울음 지속 시간의 경우 EMLA 사용군에서는 $6.9{\pm}4.0$초 대조군에서는 $14.2{\pm}9.2$초를 보여 현저한 감소를 보였다.(p<0.05) 평균 총 울음 지속시간의 경우도 EMLA 사용군에서 $9.8{\pm}6.0$초, 대조군에서 $21.9{\pm}12.8$초로 EMLA 사용군에서 현저한 울음 시간의 감소를 보였다.(p<0.05) 4) 부작용으로는 일시적 발작이 5례에서만 관찰되었다. 국소마취 연고를 영아에 대한 예방접종시에 사용함으로써 부작용 없이 통증이 완화되는 것을 관찰하였다. 그러나 EMLA 연고로 통증이 완화될 뿐 완전히 없어지는 것이 아니고, 연고 제재의 효과발현을 위하여 1시간 동안 부착하여야 하는 불편과 연고의 비용이 고가인 점 등의 문제점이 있어 예방접종시에 일상적으로 사용하기에는 아직 현실적으로 부적당하다고 생각되었다.

• Archives of Plastic Surgery
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• 제42권1호
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• pp.28-33
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• 2015

Background Topical anesthetics, such as eutectic mixture of local anesthetics (EMLA) cream, can be applied to reduce pain before minor procedure. This trial evaluated EMLA as pretreatment for facial lacerations and compared pain, discomfort and overall satisfaction. Methods This trial included consecutive emergency department patients ${\geq}16years$ of age who presented with simple facial lacerations. At triage, lacerations were allotted to either the routine processing group or EMLA pretreatment group according to date of admission. Initially, the emergency department doctors inspected each laceration, which were dressed with saline-soaked gauze. In the pretreatment group, EMLA cream was applied during wound inspection. The plastic surgeon then completed primary closure following the local injection of an anesthetic. After the procedure, all patients were given a questionnaire assessing pain using the 10-point visual analog scale (VAS) ("no pain" to "worst pain"). All questionnaires were collected by the emergency department nurse before discharge. Results Fifty patients were included in the routine processing group, and fifty patients were included in the EMLA pretreatment group. Median age was 39.9 years, 66% were male, and the average laceration was 2.67 cm in length. The EMLA pretreatment group reported lower pain scores in comparison with the routine processing group (2.4 vs. 4.5 on VAS, P<0.05), and lower discomfort scores during the procedure (2.0 vs. 3.3, P=0.60). Overall satisfaction was significantly higher in the EMLA pretreatment group (7.8 vs. 6.1, P<0.05). Conclusions Pretreating facial lacerations with EMLA topical cream aids patients by reducing pain and further enhancing overall satisfaction during laceration treatment.

• Journal of Pharmaceutical Investigation
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• 제6권3호
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• pp.58-69
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• 1976

It is well established that dissolution is freruently the rate limiting step in the gastrointestinal absorpton of a drug from a solid dosage from. The relationship between the dissolution rate and absorption is particularly distinct when considering drugs of low solubility. Consequently, numerous attempts have been made to modify the dissolution characteristics of poorly water soluble drugs. Since dissolution rate is directly proportional to surface area, one may increase the rate by decreasing the particle size of the drug. Levy has considered a number of methods by which a drug may be presented to the GI fludids in finely divided from. The direct method is the utilization of microcrystalline or micronized particles. A second method involves the administration of solutions from which, upon dilution with gastric fluids, the dissolved drug will precipitate in the form of very fine particles. A more unique way of obtaining microcrystalline dispersions of a drug has been ercently suggested by Sekiguchi et al. They have first proposed the formation of a eutectic mixture of a poorly water soruble drug with a physiologically inert, easily soluble carrier. When such systems are exposed to water or GI fluids, the soluble carrier will dissolve rapidly and the finely dispersed drug particles will then be released. It has been suggested by Shefter and Higuchi that the formation of crystalline solvate could be a powerful tool in affecting rapid disslution of highly insoluble substances. Goldberg et al. have noted that the formation of solid solution could reduce the particle size to a minimum and increase the dissolution rate as well as the solubility of the durgs. It has also been shown that the rates of solution of drugs were appreciably increased by coprectipitating the drug with soluble polymers. The increase was found to be sensitive to the method of preparation, the molecular weight of polymer and the particular ratio of drugs to polymer. Although several investigations have demontrated that the solubility and/or dissolution rates of drugs can be increased in this manner, little information is available in the literature related to the in vivo absorption pattern of drugs orally administered as PVP coprecipitates. Recently, however, it was demonstrated that both the rate and extent of absorption of the insoluble drug could be markedly enhanced when orally administered to rats in the form of a coprecipitate with PVP. The purpose of the present investigation was to ascertain the general appility of soluble polymer coprectation technique as a method for enhancing the in vitro dissolution rate of hydrophobic indomethacin. To accomplish this aim, the dissolution characteristics of pure indomethacin, indomethcin-polymer physical mixtures and indomethacin-polymer coprecipitates were quantitatively studied by comparing their relative dissolution rates. The solubility and dissolution behavior of these systems were also examined.