• 대한소아치과학회지
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• 제43권1호
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• pp.17-26
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• 2016

러버댐 방습은 환자와 술자를 보호하고 양질의 치료 결과를 얻기 위해 소아, 청소년 환자 치료 시 매우 유용하게 사용되고 있는 술식으로 다양한 장점을 가지고 있으나, 일부 환자들은 이에 불편감을 호소하기도 한다. 본 연구는 러버댐 방습에 대한 환자 및 보호자들의 선호도와 그에 미칠 수 있는 요인들에 대해 알아보기 위하여 계획되었다. 비진정치료 하에 ${\bigcirc}{\bigcirc}$대학교 치과병원 소아치과, 보존과, 일차외래에 내원하여 러버댐을 착용하에 치료를 받은 4-18세 환자들을 대상으로 작성된 설문지를 전자 차트 기록을 통하여 취합하였다. 환아들은 러버댐 방습에 대해 긍정적으로 생각하는 경향을 보였고, 치과 치료에 대해 긍정적으로 생각하는 그룹이 러버댐 방습에 대해서도 더 긍정적으로 생각하는 것으로 나타났다. 치료 시간이 짧은 그룹, 러버댐 방습에 대한 지식 및 경험이 있는 그룹에서 러버댐 방습에 대한 태도가 더 긍정적인 것으로 나타났으며(p < 0.05), 성별, 나이, 치료 내용, 마취 여부, 치료 부위, 술자 요인에 대해서는 유의한 차이가 관찰되지 않았다(p > 0.05).

• 대한치과의사협회지
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• 제53권11호
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• pp.795-803
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• 2015

A questionnaire-based survey was done to evaluate the patients' perception on the use of Rubber Dam (RD) for the tooth isolation during dental treatment. Total 106 questionnaire were gathered and the data were analyzed according to the patients' gender, age, previous experience of RD. The 96% of total patients reported no experience of RD in their previous treatment. The first advantage of RD was selected as the protection of irrigant and medication into the oral cavity and the disadvantage was selected as saliva gathering during treatment. 98% of patients want to use RD for the next treatment and 99% remarked that the RD is essential for the dental treatment. Based on the surveyed data, majority of the patients highly satisfied with the RD use and they want to use RD and may consider the use of RD for the selection of dental clinic.

• 도시과학
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• 제10권1호
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• pp.39-48
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• 2021

In this study, to evaluate the characteristics of the pollution in the major inflow tributaries and major environmental facilities in the watershed of Ara waterway, An inflow flow rate measurement and water quality analysis were conducted during dry and rainy seasons. In addition, the flow rate measurement, water quality analysis, and pollutant load at each monitoring point were compared and evaluated. Influx of BOD5, T-P and T-N into the tributaries of the ARA waterway watershed, excluding the Gulpo river watershed, during dry season were only 0.007%, 0.005% and 0.004% respectively of the incoming loads in the entire ARA waterway basin. In addition, it was confirmed that the discharge pollutant loads during rainfall event was about 440 times more for BOD5, about 545 times on T-P, and about 23 times on T-N in comparison to the pollutant loads during the dry days. When the Gulhyeon rubber dam was deflated, the discharged pollutant load during a rainfall was higher than the estimated load at the G7 monitoring point because the deposited pollutants from the upstream riverbed flowed down. Therefore, during a rainy season, it is necessary to manage the influx of high-load water pollutants from the overflow and deflation of the Gulhyun rubber dam as well as to find a strategy to reduce the pollutant loads in the Gulpo river watershed.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(1)
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• pp.493-493
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• 2005

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2003년도 학술발표회논문집(2)
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• pp.799-802
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• 2003

• 한국관개배수논문집
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• 제6권1호
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• pp.74-80
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• 1999

• Elastomers and Composites
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• 제37권3호
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• pp.183-191
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• 2002

우수한 신장성과 탄성복원 능력으로 여러 산업분야에 방진, 제진, 충격흡수 및 완충재료로 널리 사용되고 있는 고무재료에 대하여 주파수, 변형률 진폭 및 온도변화가 동특성에 미치는 영향을 실험을 통하여 검토하였다. 동특성 시험은 5종류의 경도에 대하여 인장.압축시험과 전단시험용의 천연고무 시험 편으로 비 공진법으로 수행하였다. 시험결과, 경도가 높을수록 동적 특성 값들이 크게 나타났으며 저장탄성계수와 손실계수는 주파수가 증가할수록 서서히 증가하였으며 변형률 진폭이 커질수록 감소하였다. 또한, 온도 특성을 $-50^{\circ}C$ 영역에서 저장탄성계수가 급격히 상승하며 손실계수가 최대로 나타나는 전이역임을 알 수 있었다.

• Elastomers and Composites
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• 제53권4호
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• pp.202-206
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• 2018

Five solution styrene butadiene rubber/neodymium butadiene rubber (SSBR/NdBR) composites were manufactured using different ratios of SSBR and NdBR. In this study, the composites were reinforced with NdBR and silica to confirm the physical properties of SSBR used for treads of automobile tires and the dispersibility with silica. The morphologies of the rubber composites were observed using field-emission scanning electron microscopy (FE-SEM). The crosslinking behaviors of the composites were tested using a rubber process analyzer (RPA), and the abrasion resistances were tested using a National Bureau of Standards (NBS) abrasion tester. The hardness values, tensile strengths, and cold resistances of the composites were also tested according to ASTM standards. Increased NdBR content yielded composites with excellent crosslinking properties, abrasion resistances, hardnesses, tensile strengths, and cold resistances. The crosslinking point increased due to the double bond in NdBR, thereby increasing the degree of crosslinking in the composites. The NdBR-reinforced composites exhibited excellent abrasion resistances, which is explained as follows. In SSBR, a breakage is permanent because a resonance structure between styrene and SSBR forms when the molecular backbone is broken during the abrasion process. However, NdBR forms an additional crosslink due to the breakdown of the molecular backbone and high reactivity of the radicals produced. In addition, the low glass transition temperature (Tg) of NdBR provided the rubber composites with excellent cold resistances.

• 대한소아치과학회지
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• 제40권2호
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• pp.98-105
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• 2013

질 높은 치료를 제공하고 안전한 치료환경을 만들기 위한 러버댐 사용의 중요성은 소아치과에서 더욱 강조된다. 한편 잘못된 클램프의 장착으로 발생하는 통증과 불완전한 방습은 협조도를 떨어뜨리고 진정 치료 중 방해가 되기도 한다. 본 연구에서는 혼합치열기 아동 110명의 경석고 모형을 통해 제2유구치의 치경부 근원심 폭경을 측정하고 이를 #203/204, #10/11, #205 클램프(Dentech, Japan)의 근원심 폭경과 비교하여 다음과 같은 결과를 얻었다. 제2유구치의 치경부 근원심 폭경은 하악이 상악보다 크고, 협측이 설측 보다 컸다. 모든 위치의 계측값이 클램프 폭경과 비교 시 통계적으로 유의한 차이가 있었으나, 그 차이값이 상악 제2유구치에서는 작은 반면 하악 제2유구치에서는 1 mm에 가까운 것으로 나타났다. 상악 제2유구치는 #203/204 및 #10/11 클램프와 비교적 잘 맞는 반면 하악 제2유구치를 위해서는 보다 적절한 크기의 클램프가 필요할 것으로 보인다.

• Elastomers and Composites
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• 제51권2호
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• pp.93-98
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• 2016

The composites of EVA/EPDM including aluminum trioxide (ATH) as a fire retardant were manufactured for the purpose of improving low temperature property and flame resistance in the rubbery materials. The ratio of EVA to EPDM didn't affect the flame resistance of the rubber composites. The addition of ATH resulted in increase of the flame resistance. In the evaluation of the cold resistance, the increasing EPDM content showed enhancement of cold resistance in the composites due to increasing low Tg EPDM. It was found out that tensile strengths of the composites showed a maximum value at 100 phr of ATH by reinforcing effect, but a minimum value at 200 phr of ATH owing to slippage between the flame retardant by the external stress. In the measurement of solvent resistance in tetrahydrofuran, the increasing ATH content yielded enhancement of solvent resistance by reducing swelling of the composite, and increasing EPDM content also resulted from increase of the solvent resistance by reduction of polarizability as well as increase of crosslink in the composites.