• Geomechanics and Engineering
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• 제14권5호
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• pp.407-419
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• 2018

In order to investigate flow characteristics after water inrush from the working face in process of karst tunnel construction, numerical calculation for two class case studies of water inrush is carried out by using the FLUENT software on the background of Qiyueshan tunnel. For each class water inrush from the tunnel face, five cases under different water-inrush velocity are simulated and researched. Three probing lines are selected respectively in the left tunnel, cross passage, right tunnel and in the height direction of the tunnel centerline. The variation characteristics of velocity and pressure on each probing line under the five water-inrush velocities are analyzed. As for the selected four groups probing lines in the tunnels, the change rules of velocity and pressure on each group probing lines under the same water-inrush velocity are discussed. Finally, the water flow characteristics after inrush from the tunnel face are summarized by comparing the case studies. The results indicate that: (1) The velocity and pressure change greatly at the intersection area of the cross passage and the tunnels. (2) The velocity nearby the tunnel side wall is the minimum, while it is the maximum in the middle position. (3) The pressure value of every cross section in the tunnels is basically fixed. (4) As water-inrush velocity increases, the flow velocity and pressure in the tunnels also increase. The former is approximately proportional to their respective water-inrush velocity, while the latter is not. The research results provide a theoretical basis for making scientific and rational escape routes.

• 전력전자학회논문지
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• 제10권5호
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• pp.481-487
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• 2005

제안한 유도가열 시스템은 증류탑 장치에 사용되는 특수충진체에 의한 열교환기술과 IH(Induction-Heating)전자유도가열용의 특수한 고주파 전력회로 기술을 응용한 차세대 가열방식이다. 특히 일체의 연소과정이 없다는 점에서 작업환경의 개선이 가능하며 본 기술은 IGBT대응의 고주파 인버터를 사용하여 상용교류로부터 수[kHz]의 고주파 교류를 발생시킬 수 있다. 본 논문에서는 절연체 용기 내에 특수 스텐레스 발열체부하를 수납하여 용기 외부의 고주파 공진형 인버터 접속의 워킹코일로부터 비접촉 상태로 전자유도 와전류를 구조체에 흘림으로서 발열하게 되는 새로운 유체가열방식을 제안한다. 그리고 5[kW]급 풀-브릿지 공진형 인버터 시스템과 공진부하의 동작해석, 특성분석 및 본 시스템을 이용한 고효율 스팀 발생장치의 개발과 시스템의 응용에 대해 논하였다.

• Journal of Preventive Medicine and Public Health
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• 제42권5호
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• pp.323-330
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• 2009

Objectives : The aim of this study was to investigate whether working married women in different occupational classes affected diverse health outcomes. Methods : We used data for married women aged 25-59 (N=2,273) from the 2005 National Health and Nutritional Examination Survey. Outcome measures included physical/mental and subjective/objective indicators (selfrated poor health, chronic diseases, depression, and suicidal ideation from reported results; metabolic syndrome dyslipidemia from health examination results). Agestandardized prevalence and logistic regression were employed to assess health status according to three types working groups (housewives, married women in manual jobs, married women in non-manual jobs). Sociodemographic factors (age, numbers of children under 7, education, household income) and health behaviors (health examination, sleep, rest, exercise, smoking, drinking) and a psychological factor (stress) were considered as covariates. Results : Non-manual married female workers in Korea showed better health status in all five health outcomes than housewives. The positive health effect for the non-manual group persisted in absolute (age-adjusted prevalence) and relative (odds ratio) measures, but multivariate analyses showed an insignificant association of the non-manual group with dyslipidemia. Manual female workers showed significantly higher age-adjusted prevalence of almost all health outcomes than housewives except chronic disease, but the associations disappeared after further adjustment for covariates regarding sleep, rest, and stress. Conclusions : Our results suggest that examining the health impact of work on married women requires the consideration of occupational class.

• 한국실내디자인학회논문집
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• 제26권6호
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• pp.135-144
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• 2017

In addition to the well-known 'Frankfurt Kitchen', Austrian female architect Margarette $Sch{\ddot{u}}tte-Lihotzky^{\prime}s$ architectural achievements include a study on the housing for working class, contribution to the resident participation movement, the planning of multi-family housing complexes, rational floor plan design, and the design and study of interior spaces. The purpose of this study is to investigate how she, who played intermediate roles between an architect and a social reformer, reflected social issues and the demands of living on the housing plans in the Red Wien era and to discuss diverse issues of modern residential planning furthermore. In this study, first, the housing situation in Vienna immediately after World War I was grasped and the architectural and housing discourses at that time were examined. Thereafter, cases of $Sch{\ddot{u}}tte-Lihotzky^{\prime}s$ works were investigated and analyzed. In the period of transition to modern times, the concepts of residential planning of $Sch{\ddot{u}}tte-Lihotzky$, who began as a social democratic architect, often showed transitional tendencies in private and public functions of housing, spatial distribution for the daily life, and functions of modern family and home. However, thereafter, the paradigm of the rationalism-functionalism was already sprouting from her architectural and residential plans. In conclusion, it can be said that the works of $Sch{\ddot{u}}tte-Lihotzky$ has realized the social responsibility of residential planning and become a cornerstone of the later modern housing.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.137-140
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• 2018

최근 맞벌이 가구의 수가 늘어나고 출산율도 함께 저하되면서 집에 홀로 방치되는 초등학교 학생이 전체 초등학생의 3분의 1이 넘는다고 한다. 전국 초등학교에서는 방과 후 돌봄 교실이란 정책을 시행하고 있지만 그것마저도 교실의 수를 정부에서 줄이고 있는 상황이다. 이처럼 보호자들은 아이들의 집에 혼자 두는 것을 피할 수 없고 방치 된 아이들의 하루를 궁금해 할 수밖에 없는 현실이다. 이런 보호자들과 초등학교 고학년 학생들을 위해 자기 일과를 스스로 계획하고 실천 할 수 있는 서비스를 제안하고자 한다. 이 서비스로 인해 아이는 자기조절학습능력을 키울 수 있고 보호자들은 홀로 집에 방치되어 있는 아이가 스스로 어떤 계획을 세우고 실천하고 있는지 앱을 통해 피드백을 받아 안심할 수 있다.

• Journal of Korean Dental Science
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• 제5권1호
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• pp.29-36
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• 2012

Purpose: To investigate the effects of anterior guidance (AG) change on the working (WCP) and non-working condylar paths (NWCP), and lower incisor path (LIP) using a splint with flat (FAG) or steep AG (SAG). Materials and Methods: The samples consisted of six young adult women (mean age=$23.5{\pm}3.3$ years). Inclusion criteria were skeletal Class I and normodivergent pattern, normal overbite/overjet, minimal slide from retruded cuspal position to intercuspal position, no temporomandibular disorder signs and symptoms, mutually protected occlusion, and minimal tooth wear. After the values of natural AG (NAG) were obtained as a reference for each patient, two types of splints ($15^{\circ}$ flatter and steeper than NAG) were made. After insertion of the splints with FAG or SAG, the WCP, NWCP, and LIP were recorded five times for each patient using an ultrasonic AQR (SAM, Munich, Germany) and statistical analysis was subsequently performed. Result: NAG exhibited postero-superior movement in the WCP and did not show a noticeable immediate side shift (ISS) or difference between the eccentric (EP) and returning paths (RP) in the NWCP. FAG was associated with an irregular and excessive WCP, an increase in ISS, and a difference between EP and RP in the NWCP. SAG showed minimal WCP movement and a decrease in the extent of difference between EP and RP in the NWCP. LIP showed significant differences in EP and in RP (P<0.001, all; FAG

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제23권4호
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• pp.1043-1058
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• 2009

대학수학을 수강하는 2007학년도 2학기 충주대학교 1학년 학생 100명에게 개인별로(부록2)에서 세 문항, 그룹별(2명)로 (부록3)에서 두 문항씩 학기 초에 프로젝트를 부여하고 결과를 알아보고 분석하여 다음 프로젝트 과제 수행에 활용 자료로 삼도록 하였다. 프로젝트 수행을 통해서 학생들은 수학에 대한 사고 능력과 글쓰기 능력이 향상되었고 그룹 활동을 통해 협동심과 상호 협조적인 관계의 유지의 중요성을 깨달았으며, 이런 기회를 갖게 된 것을 대학생활의 보람으로 느끼게 되었다. 특히, 효과적인 그룹 프로젝트를 통한 수업이 되려면 1) 수강 학생 수는 20인 이내가 좋고, 2) 그룹 프로젝트는 2명에게 부여하는 것이 바람직하고, 3) 교수는 학생의 수준에 맞는 문제를 교재 이외에서 선정하고, 4) 문제는 흥미 있고, 긍정적이며, 도전적이어야 하며, 5) 각 그룹에게 한 문제만 주어져야 하고, 6) 그룹들은 충분한 참고자료를 준비해야 하며, 7) 그룹의 각 구성원은 수학과 협력학습의 필요성과 중요성을 인식해야 하고, 8) 학생들은 수학을 즐거운 마음으로 다루어야 하며, 9) 실생활에서 수학이 중요함을 일깨워 주고, 10) 프로젝트 수행에 적절한 기간이 2달은 되어야 한다.

• 문화기술의 융합
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• 제10권2호
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• pp.209-214
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• 2024

본 연구는 19세기의 맨체스터의 노동 계층의 생활 공간 구조를 분석하려는 시도이다. 맨체스터에는 대표적인 노동 계층이 집단 거주하는 구역이 있었다. 엘리자베스 개스켈의 『메리바튼』은 노동자 계층의 비좁고 비위생적인 거주 여건을 묘사함으로써 그들의 비참한 생활환경을 드러낸다. 영국의 산업지대에서의 노동 계층의 생활을 분석한 엥겔스의 『영국 노동계층의 상태』는 특히 맨체스터를 주로 분석한다. 획일적으로 형성된 노동계층의 거주 구역은 부르주아의 거주 지역과는 분리되어 있었다. 도심의 상업 지구를 둘러싼 열악한 구시가지에 노동자 거주지역이 있었고, 그 주변에 중산층 거주 지역이 있었으며, 외곽에는 상류층의 주거지가 있었다. 분리와 차별로 특징지어지는 산업도시로서의 맨체스터의 형성을 추동한 것은 지배이데올로기이다.

• 한국생활과학회지
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• 제12권3호
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• pp.303-319
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• 2003

This study was designed to examine the extent of job-related stress and job satisfaction and factors affecting job satisfaction of educare center teachers. Special attention was given to the differences due to the various organizational types of educare centers. Two hundred and twenty two public and private educare center teachers of C city were drawn as samples of this study. Self-administered questionnaire method containing items (m job-related stress, Job satisfaction and socio-demographic background was employed and the data were analyzed with SPSSWlN using descriptive statistics, factor analysis and regression analysis. Findings suggested that the major job-related stresses were related to work experiences, working hours, and the number of on-the-job training opportunities. Work place characteristics such as the total number of children in the class, working hours and wage also affected the level of Job satisfaction. Additionally significant statistical differences were found on the job-related stress and the job satisfaction between teachers in public and private educare centers. In the question of the effect of job-related stress on the job satisfaction, job-related stress explained 12% of work-satisfaction, 33% of satisfaction related to the current working place. Accordingly it was possible to draw a conclusion that educare center teachers' job-related stresses. were not ascribed by personal characteristics but by work-related factors such a, poor administrative support low wage and the overwhelming task related stressors The main stressor of job satisfaction was poor administrative support. Differences on job-related stress and job satisfaction_between among teachers of public and private unit were distinctive throughout the study. These results, implicate that workshops are recommended to help diminish the job-related stress among educare center teachers. It is imperative that enhanced work benefits and improved working environment will in turn enhance the quality of services in educare centers.

• Journal of Advanced Marine Engineering and Technology
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• 제36권8호
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• pp.1030-1035
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• 2012

본 연구에서는 OTEC에 적용가능한 구심터빈을 대상으로 암모니아를 적용하여 8kW급 구심터빈의 설계 및 CFD 해석을 수행하였다. 구심터빈은 스크롤 케이싱, 18개의 베인노즐, 13개의 로터 블레이드로 구성된다. 질량유량과 입구온도는 0.5kg/s와 $25^{\circ}C$이며, 가변회전수 12,000~36,000 rpm 범위내에서 9가지 조건에 대해 해석을 수행하였다. 회전수 변화에 따른 해석결과, 설계회전수 24,000 rpm에서 최대효율점을 보였으며, 이때 최고효율은 88.66 %, 출력은 8.52kW이다. 향후, 팽창비가 1.4~1.5 정도의 범위를 갖도록 최적설계 과정을 통한 연구가 필요하다. 본 연구를 통해 분석된 해석결과는 다양한 작동유체 조건에서 목표출력에 해당하는 구심터빈의 최적 설계파라미터 구성을 위한 설계자료로 유용하게 활용될 것으로 기대한다.