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'스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.
Objectives: The purpose of this study was to assess the correlation relationship between personal exposure and urinary hippuric acid in biological monitoring for airborne toluene in an industrial complex and in general environments. Methods: Personal exposure to toluene and its metabolite, hippuric acid, in urine were simultaneously measured in occupational environments area near an industrial complex and in general environments. The study subjects were divided into three types: 137 workers who use organic solvents in the workplace, 210 residents living near a dyeing industrial complex, and 379 residents living in general environments. The toluene exposures of workers and residents were measured by a passive sampler for four days. The urine of participants was sampled when the passive samplers of personal exposure were collected. Results: The toluene and hippuric acid concentrations of workers were the highest, followed by the concentrations of residents living near a dyeing industrial complex and residents living in general environments. The coefficient of correlation between the concentrations of toluene and hippuric acid among workers was 0.749 (p<0.01) in the workplace. On the contrary, correlations between the concentrations of toluene and hippuric acid among residents living near a dyeing industrial complex and residents living in general environments were all not significant. The relationship between the concentrations of hippuric acid and toluene in three types could be described by the exponential growth model. Conclusions: This study analyzed the relationships between toluene exposure and the concentrations of hippuric acid in urine in high, middle, and low exposure environments, and could be described by the exponential growth model.
허정 ( Heo Jung ),최영태 ( Choe Young Tae ),김동준 ( Kim Dong Jun ),류현수 ( Ryu Hyeon Su ),박진현 ( Park Jin Hyeon ),김은채 ( Kim Eun Chae ),조만수 ( Cho Man Su ),양원호 ( Yang Won Ho ) 대구가톨릭대학교 자연과학연구소 2019 자연과학연구논문집 Vol.17 No.1
Students spend most of their day indoors, especially in school, which makes it easy to be affected by the quality of indoor air at schools. For this reason, indoor air quality in schools is very important. Recently, schools have expanded the installation of air purifiers to help these students take care of their health. The purpose of this study is to evaluate the efficiency of indoor air control according to the type of air purifier. In this study, PM10, CO2, TVOCs, TAB, HCHO, and NO2 were measured indoors and outdoors for each day of operation of air purification systems and for each of the nine schools. The study found that air purifier showed high control effect in the order of complex, floor top, ceiling, air purifier type, air conditioner type, and air-conditioner filter type. The control effect on particulate air pollutants (PM10, TAB) was higher than that of gas-phase air pollutants.
'스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.
Objectives: The purpose of this study was to investigate the factors affecting the use of oral hygiene products in infants. Methods: From October 2015 to December 2015, astructured questionnaire survey was conducted for infants and parents about the infants’ oral hygiene product use from 0 to 4 years of age in Seoul and other metropolitan areas. Results: The use of oral tissues for infants and children was more frequent in infants, with less than four uses of oral tissues per 10 infants. The overall amount of toothpaste usage among infants was lower than those of infants whose parents are high school or college graduates. The number of oral tissues used per infant per week was less among infants who sucked less than 4 times per 10 infants. The frequency of use of infant mouthwash per week in every 10 infants was less than those who swallow mouthwash less than once. The number of mouth rinses after the use of oral tissues for infants was high in boys, and the number of infants who sucked oral tissues was less than 4 times when used 10 times. The number of mouth rinses after the use of toothpaste was less for infants with college–graduate parents. The factors affecting the number of mouth rinsings after using oral tissues for infants were gender and sucking frequency. Conclusions: In this study, the oral hygiene products for infants were found to differ and affect the usage, the frequency of use, and the number of mouth rinses according to the general characteristics of infants and parents and the use of oral hygiene products.
최민지 ( Min-ji Choi ),박지영 ( Ji-young Park ),임미영 ( Mi-young Lim ),솨이지엔페이 ( Jianfei Shuai ),허정 ( Jung Heo ),정다영 ( Da-young Jung ),류현수 ( Hyeon-su Ryu ),오나래 ( Na-rae Oh ),김순신 ( Sun-shin Kim ),양원호 ( Won-ho Y 한국치위생학회(구 한국치위생교육학회) 2017 한국치위생학회지 Vol.17 No.1
Objectives: This study was conducted to suggest the necessity of education about toothpaste usage to infants, preschoolers, and their parents. Also, another purpose is to provide basic data that is necessary for oral health education about accurate cognition and usage of toothpaste. Methods: From October to December 2015, we conducted a survey on parents of 0~4 years old infants and preschoolers about toothpaste usage based on the data of a questionnaire with a total of 505 subjects. The survey questions were composed of general characteristics of infants, preschoolers and their parents, and toothpaste usage. Results: Usage frequency of toothpaste for infants and preschoolers increased with age (p<0.001), and infants and preschoolers in homes with monthly income under 4 million won showed high frequency of toothpaste usage (p<0.001). Toothpaste mouth rinsing of infants and preschoolers increased with age (p<0.001), while on the other hand, toothpaste swallowing decreased (p<0.001). Conclusions: In this study, it was shown that the factors that effect toothpaste usage in infants and preschoolers were age and average monthly income of the family. This suggests the necessity of oral health education to parents about usage of toothpaste in infants and preschoolers.