• 대기
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• 제17권3호
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• pp.291-298
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• 2007

The precipitable water vapors (PWVs) obtained from Global Positioning System (GPS) and Microwave Radiometer (MWR) measurements have been compared for validation of precision of the GPS PWV at Daegwallyoung station for 21 days from Sep. 30 to Oct. 20, 2006. The GPS PWV is estimated using the delay of GPS signals due to the water vapor in the atmosphere with a local mean temperature equation, called HP model, and the MWR PWV by the combinational radiance observation of two channels (23.8 and 31.4 GHz). During the co-observation period, the MWR and GPS PWV show a similar trend, and the bias between the PWVs is 1.7 mm on average. When the bias is removed, the PWV of GPS gives good agreement with that of MWR, having about 1 mm for both the standard deviation and RMS error between the GPS and MWR PWV.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.820_821
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• 2009

전력기기는 일반적으로 상용주파수인 60 Hz의 교류 전원하에서 운용된다. 따라서 고온초전도체를 전력기기에 응용하는데 있어 교류전류나 교류자장에 의한 교류손실 발생 문제는 전력기기의 경제적 운용과 관련하여 중요하게 부각되어 왔다. 또한 고온초전도체에서 발생하는 교류손실은 에너지의 열적 변환으로 인한 냉동부하 문제와도 관련되어 있기 때문에 전력기기의 안정적인 운용을 위해서도 반드시 연구되어야 할 부분이다. 특히 변압기와 같이 유도형 권선이 필요한 전력기기의 경우에는 무유도 권선 형태가 적용되는 다른 전력기기에 비해 교류 손실의 크기가 매우 크기 때문에 이를 줄이기 위한 방안에 대한 연구가 다각도로 이루어지고 있다. 본 연구에서는 임계전류와 인덕턴스의 크기는 동일하지만 권선 형태를 다르게 할 수 있는 유도형 솔레노이드 코일을 제작하였다. 그리고 제작된 솔레노이드 코일의 병렬연결 구조를 달리하여 각각의 구조에 대한 교류손실의 차이를 측정하고 분석하였다. 그리하여 측정된 결과를 토대로 고온초전도 선재를 이용한 솔레노이드 코일에서 교류손실을 줄이기 위한 구조적 방안을 제시하고자 한다.

• Applied Biological Chemistry
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• 제39권1호
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• pp.67-69
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• 1996

채취시기(採取時期)에 따른 수세미오이(Luffa cylindrica L.) 수액(樹液)의 몇가지 물리적 특성(特性)과 무기성분 함량(含量)을 조사하였다. 온실(溫室)(green house)과 노지(露地)(open culturing)에서 재배한 수세미오이의 줄기로 부터 수액(樹液)을 시기별로 채취(採取)하여 분석(分析)한 결과 명도(L), 적도(a), 황색도(b), pH 및 탁도는 시료간에 별 차이가 없었다. pH는 전체적으로 약알칼리성을 나타내었고 재배기간이 경과함에 따라 약간씩 감소(減少)하는 경향(傾向)이었다. 무기성분은 총 8개 항목을 조사한 결과(結果) K, Ca, Mg이 주요성분(主要成分)이었으며, Na, Zn, Fe는 미량(微量)함유되어 있었다. Cu는 노지재배에서는 검출(檢出)되지 않았으며 Mn은 모든 시료에서 검출되지 않았다.

• 대한약리학회지
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• 제19권2호
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• pp.9-16
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• 1983

현재 사용되고 있는 강심제로는 디지탈리스 배당체가 유일한 약물이지란 그 안전역이 대단히 좁아서 보다 안전한 강심제의 개발이 요구되고 있다. 최근 강심작용이 현저할 뿐 아니라 안전역이 비교적 넓을 것으로 인정되는 higenamine이 개발되어 그 작용기전을 밝히려는 시도가 많이 있었다. 본 연구에서는 higenamine의 강심작용 기전을 규명하기 위한 연구의 일환으로 수축빈도-수축력 상관관계(interval-strength relationship)에 있어서 1) Rested-state수축력 2) Positive inotropic effect of activation(PIEA) 3) Negative inotropic effect of activation(NIEA)에 대한 higenamine의 영향을 $Ca^{++}$및 epinephrine과 비교 분석하였다. 실험결과 칼슘은 PIEA를 증가시키기 보다는 오히려 NIEA의 소멸을 촉진함으로써 강심작용을 나타내며 epinephrine 및 higenamine은 PIEA를 증가시키고 NIEA에는 거의 영향을 미치지 않았다.

• Clinical and Experimental Reproductive Medicine
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• 제20권2호
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• pp.177-181
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• 1993

Endometriosis involving sites outside the pelvic cavity is a relatively uncommon occurrence and its frequency is cited as being less than one percent of all occurences of endometriosis. Sites previously reported in literature have described involvement of the extraperitoneal portion of the round ligament, the rectosigmoid, the appendix, and the ileum. Other more distal sites reported to have been found to have endometriosis lesions include the inguinal ligaments, the umbilicus, abdominal incisional wounds, thoracic lesions involving the pleura or diaphragm which may result in catamenial pneumothorax, the kidneys, and vulvar episiotomy wounds. Endometriosis have even been reported to occur in males. In this presentation, three cases of endometriosis, two involving the vulvar area and one involving a Pfannenstiel incision wound, is presented with a review of the pertinent literature in order to discuss its etiology, pathology, diagnosis and treatment.

• 한국환경과학회지
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• 제22권3호
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• pp.319-329
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• 2013

In this study, the cause of rapid intensity change of typhoon Nakri(0208) in view of point of a trough-typhoon interaction using diagnostic methods was examined based on 6-hourly GDAPS data from 10 to 13 July, 2002. At 0000 UTC 13 July, high PV(Potential Vorticity) region moved southeastward, reaching to the western edge of the Korean peninsula and near typhoon center at surface and there shows an increasing value of EFC(Eddy Momentum Flux Convergence). Also, as the trough and typhoon approach one another at the same time, the vertical shear(850-200 hPa) increases to more than 15 m/s. Thus, it might be concluded that the trough-typhoon interaction made intensified significantly, providing the fact that typhoon Nakri(0208) underwent substantial weakening while moving northward to around Jeju island.

• 한국인터넷방송통신학회논문지
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• 제10권4호
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• pp.41-48
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• 2010

전기적 위험요소인 아크고장, 과전류, 누설전류, 온도 등을 마이크로콘트롤러를 이용하여 실시간 감시할 수 있는 복합형 AFCI(Arc Fault Circuit Interrupter, 아크고장 차단기)를 설계 구현하며, 지그비(ZigBee)기반 네트워크를 구성함으로써 아크고장에 의한 전기화재의 위험성을 예측할 수 있는 시스템을 제안한다. 복합형 아크고장 차단기는 미국의 AFCI의 인증 규격인 UL1699의 시험 조건과 KS C 규격에서 요구하는 배선용차단기와 누전차단기의 규격을 만족시키며, 검출된 전기적 위험신호들을 분류하고 전송할 수 있는 복합형 AFCI를 네트워크의 종단에 설치하고, 화재의 위험요소들의 발생 상황을 분석함으로써, 화재 위험성을 방지하기 위한 예측 시스템의 구현에 관한 연구이다.

• 대한치과마취과학회지
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• 제2권2호
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• pp.114-117
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• 2002

Special anesthetic considerations were required for children with acute or chronic liver disease. We experienced a case of dental treatment to control infection under general anesthesia in the 2-year-old girl with liver failure. She was also scheduled for liver tansplantation. Her preanesthetic results of liver function test, electrolytes, and coagulation panel were unstable and out of normal ranges. Uneventful anesthetic induction using isoflurane and atracurium and nasotracheal intubation were carried out. General anesthesia was maintained with isoflurane for 2 hours. Oozing from multiple extraction sites was sustained, so the transfusion of platelet concentration 1 units, fresh frozen plasma 1 unit, and packed red blood cell 1 unit was done. She was recovered without complication but was transferred to pediatric intensive care unit for wound care with her endotracheal tube kept. She was transferred to a ward without noticeable complications next day. So we report this successful case of anesthetic management for dental treatment in a child with liver failure.

• Elastomers and Composites
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• 제31권2호
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• pp.104-110
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• 1996

The polyurethane was synthesized by the reaction of polycaprolactone diol(Mw 2000), 4,4'-diphenylmethane diisocyanate and 1,4-butanediol as the chain extender. Also, the modified polyurethane polymers based on liquid polybutadiene as a part of soft segment and dimethylolpropionic acid as a chain extender, giving polyurethane with various polarity, were synthesized. The thermal, mechanical, adhesion properties and water contact angles of the polyurethanes were examined. From the result of the water contact angle, the polarity of the acid modified PU containing 6% acid content was unchanged but mechanical and adhesion properties were improved. The water contact angles on polybutadiene modified PU films were increased with increasing polybutadiene content. The mechanical properties of the polybutadiene modified PU were higher than that of acid modified PU. However, the mechanical properties were reduced as polybutadiene content increased. The result is presumably due to phase separation between hard segment and soft segment. The peel strength of the polyurethane introduced with 5wt% polybutadiene was improved about 150% than that of unmodified PU. The same as the mechanical properties, the more polybutadiene was introduced, the lower peel strength was obtained.

• 한국전문물리치료학회지
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• 제9권3호
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• pp.101-111
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• 2002

The purpose of this study was to determine EMG biofeedback training effect on the muscle activities in 3 unilateral facial palsy patients along with multiple baseline design across subjects. The auditory feedback about facial muscles (orbicularis oris, orbicularis oculi, frontalis) was provided with each patient during facial exercise training. Electromyographic (EMG) activity during maximal voluntary contraction and maximal compound muscle action potential (CMAP) amplitude elected by supramaximal electrical stimulation on facial nerve of facial muscles were measured pre- and post- EMG biofeedback training to evaluate motor learning. EMG activity during maximal voluntary contraction was increased after EMG biofeedback training and CMAP amplitude elected by supramaximal electrical stimulation was not changed in all subjects. The results indicate that EMG biofeedback training is useful method to improve motor learning of facial excercise training in unilateral facial palsy patients.