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고속회전 하는 정밀부품을 위한 연질/경질 코팅의 트라이볼로지적 특성에 관한 연구
오진규,정구현,김대은,유제환,김형재 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
Recently, rotating elements which use mechanical and electrical systems have been utilized for high speed and accuracy to increase the performance. The most important thing to get a more reliable system is to understand the friction, wear and characteristics which has an effect on various coated surfaces. In this study, the tribological characteristics of various soft/hard materials were investigated by using a custom-built pin-on-reciprocator tester. From the experimental results, it was found that the friction coefficients of the soft material coated surfaces were lower under various normal loads due to thier self-lubricating ability and material transfer to the counter surface.
오후진,이유심 공주대학교 과학교육연구소 2002 과학교육연구 Vol.33 No.-
본 연구는 수학에 흥미가 적거나 소극적인 태도를 가진 학생에게 동기유발 학습자료를 적용한 결과 문제 해결능력이 개선될 수 있는지에 대해 연구했다. 이 자료의 적용으로 학생은 더 많은 흥미와 적극적인 태도, 그리고 수학과 학력이 보다 나아짐을 보였다. 본 연구의 결론은 다음과 같다. 1. 잘 개발된 동기유발 학습자료를 수업에 활용함에 따라 수업시간이 보다 활발해졌다. 2. 생동감 있는 수업 분위기가 조성되어 자신감, 흥미, 태도 면에서 긍정적인 변화를 가져왔고, 게다가 수학의 중요성도 인식하게 되었다. 3. 적극적인 학습의욕을 가지게 되어 학습 집중력이 강화되었으며, 수학과 학력을 신장시킬 수 있었다. The purpose of this study is to investigate the results from applying stimulative teaching materials to the class which consists of the students who have little interest or negative attitude in mathematics so that they can improve their problem-solving ability. With the application of these materials, students have showed more interest, positive attitude and better achievement in mathematics. The conclusions from the results of the study are as follows. 1. Students took part in the activities more in the class where interesting and well-developed teaching materials were used. 2. Students got changed positively with the live class atmosphere in the aspects of confidence, interest, and attitude and recognized the importance of mathematics as well. 3. Students began to be more active and highly motivated in the class, which got to be intensive gradually and led them to the improvement in mathematics.
8.3% Carbamide Peroxide 함유 펜 형 자가미백제인 BIancTis Forte의 색조개선 및 안전성에 관한 임상연구
이진경,민선홍,홍성태,오소람,정신혜,황영혜,유성엽,배광식,백승호,이우철,손원준,금기연 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.2
This clinical study evaluated the whitening effect and safety of polymer based-pen type BlancTis Forte(NIBEC) containing 8.3% carbamide peroxide. Twenty volunteers used the BlancTis Forte whitening agent for 2 hours twice a day for 4 weeks As a control. Whitening Effect Pen (LG) containing 3% hydrogen peroxide was used by 20 volunteers using the same protocol. The change in shade (ΔE^(*) color difference) was measured using Shadepilot™ (DeguDent) before, during and after bleaching (2 weeks, 4 weeks and postbleaching 4 weeks). A clinical examination for any side effects (tooth hypersensitivity or soft tissue complications) was also performed at each check-up. The following results were obtained. 1 Both the experimental and control groups displayed a noticeable change in shade (ΔE) of over 2 No significant differences were found between the two group (p>0.05) implying that the two agents have a similar whitening effect. 2 The whitening effect was mainly due to changes in a and b values rather than in L value (brightness). The experimental group showed a significantly higher change in b value thus yellow shade than the control(p < 0.05) 3 None of the participants complained of tooth hypersensitivity or soft tissue complications confirming the safety of both whitening agents 8.3%의 carbamide peroxide를 함유한 펜형 코팅용 미백제인 BlancTis Forte (NIBEC, Seosul & JinCheon)를 실험군으로, 3% hydrogen peroxide를 함유한글 Whitening Effect Pen (LG. Seoul) 제재를 대조군으로 각각 피험자 20명에게 2시간씩 1일 2회 제조사의 지시대로 치아표면에 4주간 적용하도록 지시하고 색조개선 효능과 안전성을 평가하였다. 미백 효과는 미백 전 및 미백 2주, 4주 및 미백 종료 4주 후에 Shadopilot™을 이용하여 색 변화를 측정하였고, 매 내원시기마다 모든 환자는 치수생활력 검사와 치주 및 치태 검사를 통해 부작용 여부 (치아과민증 및 구감 내 연조직의 부작용)를 기록한 후 다음과 같은 결과를 얻었다. 1.실험군 및 대조군의 색 변화량 (ΔE)은 2이상으로 인지할 수 있는 색 변화를 보였으며, 두 제품 간에는 통계적으로 유의한 차이를 보이지 않아 (p > 0.05) 유사한 미백효능을 나타냄을 알 수 있었다. 2,미백효과는 명도의 개선보다는 주로 a. b값의 변화에 의한 것으로 특히 실험군에서 b값의 변화, 즉 황색조의 개선효과가 대조군에 비해 유의성 있게 높은 것으로 나타났다 (p <0.05). 3.치아나 치은의 과민증이나 이상증상을 호소하는 피험자는 없어 두 제품 모두 안전성을 확인할 수 있었다.
다량의 균일한 액적 제조를 위한 분리막 기반 미세유체 소자 시스템
장문배, 유진오, 염경호 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2
In this study, we designed the microfluidic device system based on the separation membrane for generating monodisperse emulsion droplets with diameters ranging from hundreds of nanometers to several micrometers. To generate fine droplets, T-junction and flow-focusing geometry are integrated into the microfluidic channel. Also put the membrane into the microfluidic device to make droplets effectively. PDMS devices can be easily, quickly, and inexpensively fabricated with superb resolution. However, PDMS devices are swelled other organic solvent. So we could produce droplets using fluorocarbon oil. The droplet size was controlled by adjusting the flow ratio between continuous phase flow and dispersed phase flow and also membrane pore size
合成甘味料中溶性삭카린의 銀滴定法에 依한 定量法에 關한 硏究
韓世鎬,吳有珍,李琅鎬 忠南大學校 1962 論文集 Vol.2 No.-
1. KP 및 USP 法에서 얻어지는 含量%가 97.90%인데 比하여 本方法에서는 99.65%이라는 實驗結果를 얻을 수 있었다. 2. 本方法에서 使用되는 試藥및 標準液은 普遍的으로 흔히 使用되는 것들로서 쉽게 市中에서 入手할 수 있는 것들이다. 3. 本方法은 그操作法에있어 KP 및 USP의 方法보다 簡便하며 또한 迅速하여 많은 時間을 短縮시켜주고 있다. In present, the assay of soluble saccharin was titrated with NaOH solution into the Extracts after extract of saccharin by Organic solvents. But in this method adopt a new, was precipitated as Ag-salt with AgNO_3 in weak acid quantitatively. Ⅰ. It can quantify exactly without any disturbance, It control to the suitable acid, such as Dulcin or other mixtures in Synthetic sweeting Materials. Ⅱ. It has a highly accuracy and quantify the saccharin till 99.9% Ⅲ. It showed marked a simply and rapidly than the method of KP. USP. JP etc. in tasts and processes.
宋東勳,裵振勝,鄭燦赫,吳世德,李基源,劉忠烈,河載承,李光培,金玄郁 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-
With rapid growth of the internet, need for the mobile communication networks is increasing. In this paper, we implement and test Mobile IP Protocol in Embedded System. Our Mobile IP-based testbed consisted of two sub-networks and each sub-network was configured to operate independently through use of router. To satisfy integrated wired/wireless network model established on the testbed design and show generality of the testbed, we implemented mobile nodes, home agent, foreign agent and router on the basis of Linux operating system. As the results of the evaluation, we confirmed that mobile nodes operated properly according to Mobile IP Protocol.
이지은,장혜경,오지영,유윤경,김현지,임숙인,연숙희,강진숙,최귀령 한국병원약사회 2003 병원약사회지 Vol.20 No.1
In an aging society, there is an increasing possibility of the duplication of the drugs given to patients because they take many kinds of drugs. Among the prescriptions given to the patients who was treated at multiple ambulatory clinics in St. Mary's hospital for one month of September, 2002, in which drugs that has identical or similar effects are prescribed, we analysed and evaluated them by patients' characteristics, kinds of medication, severity of side effects on a case by case basis. More, we assessed the potential additional costs. As a result of this study, the duplication rate turned out to be 6.69% and it was shown that the proportion of the elderly patients over 60 was high. The gastro-intestinal medications took up a large part and most of the cases showed that the danger caused by double taking of medicine was slight, but there were some examples in which the serious side effects were predicted. Expected additional costs were the average 11.349 won and it ranges from the minimum of 56 won to the maximum of 135,720 won. In conclusion, the management of drug histories of the patients who need the plural treatments is very important and the necessity of the individual and professional guidance of taking medicines for the elderly patients is emerged, too.