http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
소음 수응 한계를 고려한 저주파 소음평가에 대한 실험적 연구
홍승기(Hong, Seung-Ki),김재환(Kim, Jae-Hwan),김규태(Kim, Kyu-Tae),이수갑(Lee, Soo-Gab) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.8
A laboratory study on low frequency noise assessment has been carried out to evaluate the relevance of the weighting curve. Especially, the A-weighting curve which is used in most noise assessments has been evaluated using the acceptability limit in this study. The acceptability limit is one of the indicators in which the subjective responses were well-reflected. For the measurement of the acceptability limit, pure tone stimuli were used in the frequency range between 20 and 200 Hz. The measurement was proceeded in the anechoic chamber to minimize the background noise level. A total of 29 test subjects, who were aged between 19 to 33 years, participated in this study. They had been exposed to various stimuli for about 1 hour by supra-aural earphone. The measurement consisted of two listening sessions: hearing threshold and the acceptability limit session. The results showed that the tendency of the acceptability limit curve was approximately equal to C-weighting curve which had been found to be superior to A-weighting curve in assessment of low frequencies.
태권도 활동 참가 동기에 따른 수련 만족도가 자아존중감, 신체적 자기효능감에 미치는 영향
홍이수(Hong Lee-Soo),김성수(Kim Sung-Su) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.4
The purpose of this study is to empirically inquire into the effect of training satisfaction by Taekwondo participation motivation on self-esteem and physical self-efficacy, and understand factors influencing training satisfaction to give valuable information in having more healthy sports activities and school life, and thus furnish basic data for more in-depth understanding of children`s psychology. A survey was made on 313 persons of 11 to 13 year-old elementary school students participating in Taekwondo training at the Taekwondo studio in its jurisdiction located at Incheon and Bucheon. The result of this study is as follows. It showed that for elementary school students' Taekwondo training, the higher intellectual and cognitive motivation, the more training satisfaction is improved, which the improved training satisfaction acts to raise self-esteem and physical self-efficacy. The rise of self-esteem through this was also significant in improving physical self-efficacy. Consequently, for their Taekwondo training, the higher intellectual motivation of knowledge and curiosity about Taekwondo and cognitive motivation of physical improvement and skill acquisition than social motivation of new friends' or friend's recommendation, the more satisfaction with Taekwondo training is improved, serving as a good momentum that improves self-esteem and physical self-efficacy.
사용 후 터치스크린 패널의 투명전극용 ITO의 폐기방법별 물질 전과정평가
이수선 ( Soo Sun Lee ),이나리 ( Na Ri Lee ),김경일 ( Kyeong Il Kim ),안중우 ( Joong Woo Ahn ),홍태환 ( Tae Whan Hong ) 한국전과정평가학회 2012 한국전과정평가학회지 Vol.13 No.1
In this research, Material Life Cycle Assessment(MLCA) has been carried out to evaluate the environmental impacts about disposal of ITO(Indium Tin Oxide). ITO is often used for touch and flat screen of phone, PC, computer because of its electrical conductivity and optical transparency which it can be deposited as a thin film. Indium is one of the rare earth and used to ITO material. When demand of the ITO increases, shortage of indium have concerned. This is not only resources insufficient problem it is also environmental problem. Because ITO which did not recycle and landfill or incineration cloud be cause a environmental pollution. According to waste treatment method, disposal about 1kg of ITO was used as the reference flow. There are difficulties for data collection about emissions from waste treatment in LCA. So there is a need to focusing landfill, incineration process for ITO. From this study, it is found out that landfill of ITO has the highest environmental impacts except GWP. But incineration is also high environment impact value by a little gap.
철근부식, 겹침이음 및 축하중의 영향을 고려한 원형 전단 교각의 내진성능실험
이수형 ( Soo-hyung Lee ),이승건 ( Seung-geon Lee ),이혜린 ( Hyerin Lee ),홍기증 ( Kee-jeung Hong ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 논문집 Vol.25 No.6
노화된 교각의 횡철근, 주철근, 겹침이음의 철근부식은 교각의 내진성능에 직접적인 영향을 끼친다. 횡철근 및 주철근의 철근부식은 교각의 전단강도 및 휨강도를 각각 직접적으로 감소시킨다. 겹침이음에 철근부식이 생긴다면, 특히 내진설계되지 않은 기존 노후 교각의 휨강도 및 휨연성을 상당히 감소시킨다. 더불어, 교각에 작용하는 축하중이 증가하면 교각의 전단강도가 증가하게 된다. 이러한 영향들을 고려하여, 본 연구에서는 노화를 고려한 합리적인 내진성능평가를 위해, 앞서 언급한 철근부식, 겹침이음, 축하중이 형상비 2이하인 교각의 전단거동과 휨거동에 어떠한 영향을 미치는지 실험을 통해 확인한다. 철근부식으로 인해 전단파괴가 일어날 것으로 예상되는 교각에서 오히려 휨파괴가 발생하는 것을 확인한다. 이러한 파괴모드와 그 원인을 분석하고 내진보강 시 필요한 고려사항을 제시하였다. The corroded pier that has corrosion of the tranverse steel, main steel and lapsplice directly affects the seismic performance. The corrosion of the tranvese and main steel directly reduce the shear strength and bendig strength. If steel corrosion occurs in lap splice, the flexural strength and flexibility of existing corroded pier that are not seismic design are significantly reduced. In addition, as the axial force acting on the pier increase the shear strength. Considering these effects. In this stuydy, we cosidered steel corrosion, lap splice and axial force, for a reasonable evaluation of seismic-performance. It is confirmed that flexular failure occurs at pies where shear failure is expected to occur due to corrosion of reinforcement. These failure modes and their reason are analyzed, and necessary considerations are presented for seismic reinforcement.
물질전과정평가(MLCA)를 통한 투명전극 ITO (Indium Tin Oxide)의 환경성 평가
이수선(Soo-Sun Lee),이나리(Na-Ri Lee),김경일(Kyeong-Il Kim),홍태환(Tae-Whan Hong) 한국청정기술학회 2012 청정기술 Vol.18 No.1
본 연구에서는 휴대용 기기의 터치스크린에 사용된 ITO (Indium Tin Oxide) 투명전극의 재활용에 대한 환경성 평가를 실시 하였다. ITO 전극의 경우 도전성과 함께 투명성을 가지는 재료로서 터치 패널이나 LCD (Liquid Crystal Display), ELD (Emitting Light Device), PDP (Plasma Display Panel) 등 각종 디스플레이 장치의 제조를 위한 투명전극으로 수요가 증가하는 추세이다. 특히 인듐과 같은 희소금속을 함유하고 있기 때문에 국가 전략적으로 반드시 재활용되어야 한다. 또한 매립이나 폐기시 발생하는 환경오염 및 인간에게 미치는 영향도 고려해야 한다. 이에 대해 Material Life Cycle Assessment (MLCA)를 이용하여 ITO를 재활용과 매립의 두 가지 처리방법에 따른 환경부하를 정량적으로 분석하고자 한다. 또한 이산화탄소 배출과 투입된 에너지량도 계산하였다. 재활용은 폐 디스플레이에 포함된 ITO의 10, 20, 30%를 회수했을 때를 기준으로 한다. In this study, we executed an environmental impact assessment about recycling of ITO (Indium Tin Oxide), used for touch panel. ITO is mainly used to make transparent conductive coatings for touch and flat screen LCD (Liquid Crystal Display), ELD (Emitting Light Device), PDP (Plasma Display Panel). This demand is increasing little by little. but form current status, ITO is discarded than recycling. It is important to recycling ITO for national strategies about resource conservation, and reduce environmental burden. Also Landfill or incineration of ITO cloud be harmful to the human health in the long-term. Material Life Cycle Assessment method (MLCA) was conducted for comparison landfill and recycling of ITO. MLCA would provide more information for environmental issues and potential environmental impacts of ITO. The study includes two scenarios, the basic scenario is recycling of ITO (10, 20, 30%) and the other scenario is landfill of ITO. In addition, amount of carbon dioxide and energy were calculated.
하천수에서 LC-ESI-MS/MS에 의한 극미량 농약류 및 합성원료의 동시분석법
홍선화,이준배,이수형,조영환,신호상,Hong, Seon-Haw,Lee, Jun-Bae,Lee, Soo-Hyung,Cho, Young-Hwan,Shin, Ho-Sang 대한화학회 2015 대한화학회지 Vol.59 No.3
하천수 중에 7가지의 농약류(2,4-dichlorophenoxyacetic acid, 메소밀, 알디캅, MCPA, molinate, 카바릴, 카보퓨란)와 2가지의 합성원료(quinoline, 비스페놀-A)를 액체크로마토그래피 전자분무 이온화 질량분석법(liquid chromatography-electrospray ionization-tandem mass spectrometry, LC-ESI-MS/MS)을 사용하여 분석하였다. 분석물질들은 고체상 추출법(solid-phase extraction, SPE)을 사용하여 추출하였다. 용리액은 질소가스로 농축하였다. 잔여물에 30% 메탄올 수용액 100 μL를 재 용해시켜 0.2 μm PTFE 실린지 필터로 거른 후 그 일부를 LC-ESI-MS/MS에 직접 주입하여 분석하였다. 확립된 조건에서 검정곡선은 0.997 이상의 상관계수를 갖는 직선성을 보였다. 정량한계는 0.002~0.011 μg/L 이었고, 정밀도는 16.4% 이하였다. 또한 정확도는 84~107%의 범위를 보였고, 회수율은 56.2~98.6% 값을 나타내었다. 본 연구에서 개발한 분석법을 실제 하천수 분석에 적용하였다. A liquid chromatography-electrospray ionization-tandem mass spectrometry method (LC-ESI-MS/MS) was used for determining seven pesticides (2,4-dichlorophenoxyacetic acid, methomyl, aldicarb, 2-methyl- 4-chlorophenoxy- acetic acid, molinate, carbaryl and carbofuran) and two synthetic materials (quinoline and bisphenol-A) in surface water. The analytes were extracted using solid-phase extraction (SPE). The eluate was concentrated by nitrogen gas. 100 microliters of 30% (v/v) methanol aqueous solution were used to dissolve the residue and an aliquot of the reconstituted solution was directly injected into LC-ESI-MS/MS after the filtration using 0.2 μm polytetrafluoroethylene (PTFE) syringe filter. Under the established condition, the calibration curves of the analytes were linear with correlation coefficients of above 0.997. The quantification limit was 0.002~0.011 μg/L and the relative standard deviations were less than 16.4%. In addition, accuracy was in the range of 84~107% and the recoveries were values between 56.2 and 98.6%. In this study, the developed method was applied to the analysis of real surface water samples.