• 한국지반환경공학회 논문집
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• 제14권6호
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• pp.13-19
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• 2013

본 연구에서는 액상화 평가 대상지반을 선정하여 미국, 일본 등 액상화 발생지역에 적용한 사례가 있는 에너지를 기반으로 하는 Arias intensity 액상화 평가법을 적용하고, 적용성을 검토하기 위하여 기존의 원위치시험을 통한 액상화 간편예측법을 수행하여 평가결과를 비교하였다. 대상지반에 대한 액상화 평가결과, Hachinohe 지진과 Ofunato 지진의 실지진기록을 이용한 Arias Intensity 안전율은 간편예측 안전율과 유사하게 산정되었으며, 설계응답스펙트럼으로부터 작성된 인공지진의 경우 Arias Intensity 안전율은 간편예측 안전율과 비교하여 다소 차이가 나타났다. 액상화를 발생시키는 전단응력비와 발생강도는 응력과 에너지라는 서로 다른 개념으로 산정되지만, 간편예측법의 전단저항응력비와 Arias Intensity의 저항강도는 실지진에 따른 액상화 발생지역을 대상으로 한 표준관입시험 등 경험적 도표를 사용한다는 점에서 Hachinohe 지진과 Ofunato 지진의 경우 Arias Intensity 평가법과 응력개념의 간편예측법 사이에 비슷한 결과가 나타난 것으로 판단된다. 따라서, 에너지를 기반으로 하는 Arias Intensity 액상화 평가법은 응력개념의 간편예측법에서 고려하지 않은 실지진 기록에 대한 가속도, 지속시간, 진폭 등의 지진특성으로 야기되는 지반의 동적변화를 표현할 수 있음을 확인할 수 있었다.

• 한국지반공학회논문집
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• 제25권2호
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• pp.55-66
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• 2009

경상북도 포항시 동해면 석리지역의 국도변에 위치한 이암으로 구성된 사면에서 실제로 발생한 사면붕괴 사례를 중심으로 이암사면의 강우유형에 따른 침투해석을 시행하여 강우가 사면에 미치는 안정성 분석에 대한 연구를 수행하였다. 이를 위하여 붕괴가 발생한 사면을 대상으로 정밀지표조사, 지구물리탐사 및 시추조사를 수행한 후 상세 지층상태를 분석하고, 붕괴 활동면이 위치하는 구간에 대하여 slaking/swelling시험을 통해 내구성이 저하되는 것을 파악하고, 현장투수시험을 통해 토층별 투수성을 파악하였다. 또한 한계평형해석 프로그램인 Talren 97을 이용하여 역해석에 의한 강도정수의 변화분석 및 Slope/W 프로그램을 이용하여 호우시 침투거동과 강우량에 따른 사면내 수압의 변화에 의한 불안정하게 되는 과정을 분석하였다. 실제 붕괴이력을 갖는 사면을 대상으로 지형적인 조건과 서로 상이한 강우조건을 적용하여 사면의 지질구조대 발달 및 사면표면의 상태에 따른 강우침투로 인한 지하수의 상승과 강우지속시간에 따른 침투해석을 통해 사면의 안정성을 분석하였다.

• 대한인간공학회지
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• 제19권2호
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• pp.15-31
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• 2000

The aim was to evaluate the prevailing ergonomic and psychosocial conditions regarding low back injury in an automobile assembly system. This study consisted of two parts. In the first part of the study, analytic biomechanical model and NIOSH guidelines were applied to evaluate risk levels of low back injury for automobile assembly jobs. Total of 246 workers were analysed. There were 20 jobs having greater back compressive forces than 300kg at L5/S1. Also, there were 44 jobs over Action Limit with respect to 1981 NIOSH guidelines. This might in part be explained by the ergonomic conditions of the company analysed generally being good, with a relatively low duration of 'combined' extreme work posture. The relationship between psychosocial factors and low back injury was examined in the second part of the study. It has recently been recognized that overall reaction to working conditions was influenced by a range of factors, some of which were physical and some psychosocial. The psychosocial environment surrounding the work place may contribute to the perception of risk and eventual ill-health. A battery of questionnaires concerning the psychosocial stress based on PWI(Psychosocial Well-being Index) and musculoskeletal pain symptoms at low back was completed by 246 workers at the same plant. Results showed that 207 out 246 workers experienced the symptoms and 27 workers were diagnosed as patients. Two groups(low stressed, high stressed) based on PWI score had no significant relationships with both symptoms and results of diagnosis. However, sensitivities for symptoms and diagnosis by PWI were 91.3% and 92.6% respectively. Finally, relationships between physical work load and psychosocial stress were analysed. Specifically, some postural factors {vertical deviation angle of forearm, horizontal deviation angle of upperarm, vertical deviation angle of thigh, etc) were highly correlated with psychosocial stress. The results illustrated that PWI scores were associated with some physical workloads. However, psychosocial stress levels couldn't be well related with the pain symptom as well as the actual incidence of low back injury since pain or discomfort regarding low back injury were more complex than that of other musculoskeletal disorders.

• 한국지역사회생활과학회지
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• 제28권3호
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• pp.461-479
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• 2017

This study was to investigate the appearance orientation and body shape management of adolescents in Daejeon. A survey was performed from December 16th~28th 2015 and 355 respondents were collected for analysis. 45.9% of the subjects were middle school students, whereas 54.1% of them were high school ones. The female and high school students tended to show higher ratings in lookism tendency and interests in beauty care, whereas male and middle school students tended to show higher ratings in physical satisfaction than the others. More than 40% of the respondents perceived them fatter than the standard weight, in particular, girls and the ones with opposite-sex friend perceived them fatter than their actual conditions. On body shape satisfaction, female and high school students indicated lower satisfaction. For body shape management, 75% of the female and 40% of the male students had tried weight control. The frequency and the duration time of exercise had higher for boys than girls, and the ones with opposite-sex friend than without. For methods of weight control, girls were more likely to do diet control, whereas boys were more committed to exercise. In general, students with high appearance orientation tended to control taking snacks and fast food or did diet control for body shape management. Conclusively, continued interest and guidance, not only at home but also in school, is required for students so that they can do proper body shape management to fulfill their appearance orientation and they will improve academic performance by gaining confidence through their appearance satisfaction.

• 한국인터넷방송통신학회논문지
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• 제15권1호
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• pp.291-298
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• 2015

직접 실물을 보고 검토한 후 구매하려고 하는 소비자의 특성으로 인해 온라인으로 아동가구를 판매하는 것은 쉽지 않은 일이다. 본 논문에서는 아동가구시장의 온라인 쇼핑몰의 발전 방안을 마련하기 위해, 구매 전 소비자의 의향을 설문으로 확보한 후, 실제 판매데이터와 비교 분석하여, 소비자의 의향과 실제 판매된 자료와 어떤 차이점이 있는지를 분석하였다. 아동가구 온라인 쇼핑몰 서버의 데이터를 이용하여 사이트 방문횟수, 페이지 접속수, 페이지 체류시간, 쇼핑몰내 접속자 이동경로를 분석하였고, 또한 온라인의 어떤 광고를 통하여 고객이 유입되는지 분석하였다. 분석결과 온라인으로 아동가구를 구매하는 소비자들의 디자인, 가격할인, 브랜드 인지도, 실용성에 대한 요구를 파악할 수 있었다. 아동가구 온라인 쇼핑몰 경쟁력 강화를 위해 온라인상의 가구 체험강화, 제품의 차별화전략, 고정고객의 확보의 필요성을 제시하였다.

• 한국가스학회지
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• 제22권3호
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• pp.53-64
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• 2018

천연가스는 폭발성 유체로 고압의 매설 배관 파손시 심각한 인적/물적 손해를 야기할 수 있으며, 최근에도 실제 매설 배관의 파손으로 상당한 인명피해가 발생한 사례가 보고되고 있다. 국내의 경우, 급속한 성장 및 보급에도 불구하고 천연가스 배관의 운영 길이와 운영기간이 짧아 가스배관의 사고원인 등에 대한 유효한 사고데이터의 확립이 부족한 실정이다. 국내에서 사고 사례에 대한 데이터베이스를 체계적으로 구축하기 위하여 국내보다 천연가스 배관의 운용 역사가 길고, 긴 배관망을 갖고 있는 해외 주요국에서 발생한 최근의 천연가스 배관관련 사고의 원인과 빈도를 분석하는 것이 필요하다. 따라서 본 연구에서는 해외 주요국에서 가스배관의 사고원인별 발생 빈도의 추이를 파악한 후 이를 비교 분석하여 국내 고압가스 운송 배관망의 안정성 확보의 토대를 구축하고자 하였다.

• 한국환경보건학회지
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• 제36권2호
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• pp.95-107
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• 2010

Hand-washing is one of the major factors in personal hygiene and public health. This study was undertaken to investigate the hygienic behavior of food-service employees, focusing on awareness of hand washing, hand washing practices, and the load of index microorganisms (aerobic plate count, total and fecal coliforms, Escherichia coli, and Staphylococcus aureus) on the hands of food-service employees. A questionnaire survey completed by direct interview, direct observation of restrooms by the researcher and trained observers, and microbiological examination according to the Food Code of Korea were carried out. In the survey, a positive attitude toward hand washing compliance was reported; however, improper hand washing and poor hand hygiene of the food-service employees were seen under direct observation. Significant differences (p<0.05) were found between the questionnaire survey and the direct observations in hand washing compliance after using the toilet, duration of hand washing, use of hand washing agents, use of hand washing tools, washing of different parts of the hands, hand-drying method, temperature of water, and method of turning off the water. Samples taken from employees' hands before washing showed higher levels of bacteria than those taken during work and/or after washing (p<0.05). Poor hand washing practices were indicated by the positive results for total and fecal coliforms, E. coli, and S. aureus on the hands of some food-service employees. This study showed that there is a marked difference between the food-service employees' awareness of hand-washing and their actual hand-washing practices. The poor hand hygiene of and improper hand washing by the food-service employees should be addressed for improved food safety.

• 한국건설관리학회논문집
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• 제5권6호
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• pp.235-244
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• 2004

도심지의 대형 공사를 그것도 짧은 공기 내에 수행함에 있어 가장 중요한 과제로 부각되는 것은 건설 주요 자원의 효율적인 관리이다. 즉 자재, 인원, 장비 등의 적기적소 조달이 주요 관리 항목이 되고 있다. 또한, 자원의 적기적소 조달을 위한 생산 단계별 생산주체간의 효율적인 정보의 교환은 성공적인 공사 수행에 절대적인 영향을 끼치게 된다. 따라서 이러한 정보를 효율적으로 관리하여 주요 자원을 조달, 운반, 양중, 적치, 설치 각 단계별로 관리할 수 있도록 하는 주요 자원 관리 시스템의 개발이 필수적이다 본 연구에서는 자동차 제조 산업 등 타 산업분야에서 성공적으로 사용된 적시생산의 기본적인 원리와 정보전달기법, 즉 간판시스템의 기본개념을 응용하여 건설프로젝트 자원정보관리시스템을 개발하였다. 또한, 이 시스템을 콘크리트 타설 공사에 적용하였다. 현장의 콘크리트 공사 흐름을 분석한 후, 가치흐름맵핑(VSM)을 통해 정보관리 개선 후 개선모델(FSM)을 제시하고, 이를 실제 초고층주상복합 건물현장의 자원정보관리에 적용하였다. 또한 현장 적용 시 도출된 적용성 등 문제점을 보완하여, 시스템의 추후 사용성을 제고하였다.

• 한국치위생학회지
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• 제6권1호
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• pp.63-77
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• 2006

The purpose of this study was to prepare a student and education guideline by examining the college life satisfaction of students studying dental hygiene. Subjects were students going to dental hygiene-related department of three colleges in the Gwangju and Jeonnam areas. College life and life satisfaction was examined at general characteristics. The following results were obtained. 1. Subjects included 35.7% of 1st grade, 33.4% of 2nd grade, and 30.9% of 3rd grade. In the health state, average accounted for the highest percent(76.9%); in the student's associates, a little for the highest percent(76.8%); and in the participation in clubs, no participation for the highest percent(77.1%). 2. For motives to select the dental hygiene, good employment after graduation accounted for the highest percent(61.0%). The highest desired employer was a dental clinic(33.5%), and the highest desired duration was a whole life(61.0%). 3. According to the grade, satisfaction was significantly different in social recognition, major in education, professor, facilities, professor-student, career, and college development(pE0.05). 4. According to the school record, satisfaction was significantly different in social recognition, major in education, professor, professor-student, career, college development, and general life(pE0.01). 5. According to the student's associates, satisfaction was significantly different in social recognition, major in education, professor-student, and general life(pE0.01). 6. According to the participation in clubs, satisfaction was significantly different in professor, facilities, college development, and religious life(pE0.05). In conclusion, as students were in the lower grade, made good school record, had happier associates, and participated in clubs more actively, their satisfaction at college life became higher. Accordingly, professors and school authorities should strive to examine students' actual problem and discuss and resolve them in order to help their effective school life.

• 한국치위생학회지
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• 제8권1호
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• pp.59-71
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• 2008

This study was conducted to provide basic data required for the development of dental hygiene project for babies by investigating the relationship between mothers' dental hygiene activities and their socio-economic characteristics and the dental hygiene activities of babies. The survey was carried out with questionnaire to 306 babies of ages from 4 to 7 years and their mothers, from January 5 to January 25, 2007, in 4 kindergartens in Masan, Korea. The collected data was processed with SPSS v.12.0 for frequency analysis and ${\chi}^2$-test per item, to obtain following conclusions. 1. The frequency of toothbrushing of children is two times, accounted for 52.3%, they brush the teeth by them, and accounted for 52.3%, Fluorine toothpaste 68.3%. 2. The frequency of meal of children is 3 times, accounted for 93.5%, they ingestcariogenic snack 1 time, accounted for 45.4%, and they ingest protective and detergent snackfrom dental caries 2 times, accounted for accounted for 45.1%. 3. The shorter the period of mothers' duration of visit to dentists, the more experiences of fluorine coating and help from parent in toothbrushing had the children (pE.01, pE.05). 4. Children of housewife mothers received help from parent in toothbrushing and take teeth care and clean snack more than those of working mothers (pE.05, pE.01). 5. The children of working mothers had fluorine coating more than those of housewife mothers (pE.05). The fluorine coating, toothbrusing, protection and eating green food of babies show significant differences according to the frequency of mothers' visit to dentists and occupation.