• 제목/요약/키워드: self-media

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Micro/Nanotribology and Its Applications

  • Bhushan, Bharat
    • Tribology and Lubricants
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    • 제11권5호
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    • pp.128-135
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    • 1995
  • Atomic force microscopy/friction force microscopy (AFM/FFM) techniques are increasingly used for tribological studies of engineering surfaces at scales, ranging from atomic and molecular to microscales. These techniques have been used to study surface roughness, adhesion, friction, scratching/wear, indentation, detection of material transfer, and boundary lubrication and for nanofabrication/nanomachining purposes. Micro/nanotribological studies of single-crystal silicon, natural diamond, magnetic media (magnetic tapes and disks) and magnetic heads have been conducted. Commonly measured roughness parameters are found to be scale dependent, requiring the need of scale-independent fractal parameters to characterize surface roughness. Measurements of atomic-scale friction of a freshly-cleaved highly-oriented pyrolytic graphite exhibited the same periodicity as that of corresponding topography. However, the peaks in friction and those in corresponding topography were displaced relative to each other. Variations in atomic-scale friction and the observed displacement has been explained by the variations in interatomic forces in the normal and lateral directions. Local variation in microscale friction is found to correspond to the local slope suggesting that a ratchet mechanism is responsible for this variation. Directionality in the friction is observed on both micro- and macro scales which results from the surface preparation and anisotropy in surface roughness. Microscale friction is generally found to be smaller than the macrofriction as there is less ploughing contribution in microscale measurements. Microscale friction is load dependent and friction values increase with an increase in the normal load approaching to the macrofriction at contact stresses higher than the hardness of the softer material. Wear rate for single-crystal silicon is approximately constant for various loads and test durations. However, for magnetic disks with a multilayered thin-film structure, the wear of the diamond like carbon overcoat is catastrophic. Breakdown of thin films can be detected with AFM. Evolution of the wear has also been studied using AFM. Wear is found to be initiated at nono scratches. AFM has been modified to obtain load-displacement curves and for nanoindentation hardness measurements with depth of indentation as low as 1 mm. Scratching and indentation on nanoscales are the powerful ways to screen for adhesion and resistance to deformation of ultrathin fdms. Detection of material transfer on a nanoscale is possible with AFM. Boundary lubrication studies and measurement of lubricant-film thichness with a lateral resolution on a nanoscale have been conducted using AFM. Self-assembled monolyers and chemically-bonded lubricant films with a mobile fraction are superior in wear resistance. Finally, AFM has also shown to be useful for nanofabrication/nanomachining. Friction and wear on micro-and nanoscales have been found to be generally smaller compared to that at macroscales. Therefore, micro/nanotribological studies may help def'me the regimes for ultra-low friction and near zero wear.

호스피스 사이버상담 프로그램 운영에 대한 소고 (Operating Report of a Hospice Cyber Counselling Program)

  • 유지수;이윤정;강세원
    • Journal of Hospice and Palliative Care
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    • 제9권1호
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    • pp.30-34
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    • 2006
  • 목적: 본 연구는 말기 질환자 및 가족들의 삶의 질 증진 차원에서 호스피스 사이버 상담을 위한 인력 훈련 및 홍보 시행을 통하여 호스피스 사이버 상담 프로그램을 운영하여 보고자 한다. 방법: 본 연구는 호스피스 사이버 상담 제공을 위한 상담 인력 훈련, 홍보 전략 구축, 운영 및 효과 평가의 절차로 진행하였다. 결과: 2004년 10월부터 2005년 7월까지 약 9개월 동안 사이버 호스피스 홈페이지를 방문하여 회원가입을 한 대상자는 총 72명으로 20대가 17명(23.6%), 30대가 12명(16.7%), 40대가 17명(23.6%), 50대 이상이 13명(18%)를 차지하였다. 진단명 별로는 암과 관련된 질환이 90%를 차지하였으며, 상담 내용과 상담신청자와의 관계는 가족이 90%를 차지하였으며, 10%만 본인이었다. 회원 중 30명이 온라인 상담을 이용하였으며 상담 건수는 35건이었다. 상담 건수 및 상담 이용 회원수는 적었으나, 상담 이용 후 지속적인 상담원과의 연계 및 사이트 활용의 경향을 보였다. 결론: 말기 질환자 및 가족들의 삶의 질 증진, 호스피스 사업 활성화의 기초 활동으로써 호스피스에 대한사이버 상담 프로그램을 실질적으로 운영하였다. 호스피스 사이버 상담의 활성화를 위해 대중 매체 및 언론을 통한 호스피스 사업에 대한 기본적인 홍보들이 지속적으로 이루어져야 하며, 의료진을 대상으로 한 호스피스에 대한 교육도 계속되어야 할 필요가 있다.

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생체모방 기반 융합 학습 모델을 적용한 '골격근의 구조와 수축'에 대한 디지털 교재 개발 (Development of a Digital Textbook on 'Structure and Contraction Mechanism of Skeletal Muscle' with the Learning Model for Biomimicry-Based Convergence)

  • 김수연;권용주
    • 과학교육연구지
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    • 제42권2호
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    • pp.95-105
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    • 2018
  • 이 연구의 목적은 생체 모방 기반 융합 학습 모델을 이용하여 골격근의 구조 및 수축 메커니즘에 대한 디지털 교과서를 개발하는 것이다. 골격근의 구조 및 수축 메커니즘 단원은 고등학교 생명과학I에 포함된 내용이다. 융합 학습 모델은 3D 모델링 및 프린팅을 포함하는 3단계의 생체 모방 기반 융합 학습(Exploration-Design-Implementation)으로 설계되었다. 개발된 디지털 교재는 8차시로 구성되어 있는데, 골격근 탐색, 스케치 앱과 3D 모델링을 이용한 골격근 모방 창의적 설계 2개 차시, 3D 프린팅을 이용하여 설계안의 융합적 구현, 근수축의 탐색, 스케치 앱과 3D 모델링을 이용한 근수축 모방 창의적 설계 2개 차시, 3D 프린팅을 이용하여 설계안의 융합적 구현 등으로 구성되었다. 각 차시는 대화 형 및 모바일 학습을 위해 갤러리 위젯, 미디어 위젯, 프레젠테이션 위젯, 스케치 위젯, 클라우드, 설문 위젯 및 평가 위젯의 컨텐츠를 포함하고 있다. 개발 된 디지털 교과서를 고등학생 20 명에게 투입한 결과 학생들의 생명과학 학습에 효과가 긍정적인 것으로 나타났다. 또한 이 연구에서 개발된 생체 모방 기반 융합 학습 디지털 교재는 학생들의 창의적 설계 및 구현 능력의 향상에서 효과적인 학습자료로 평가되었다. 이러한 결과를 볼 때 디지털 교재는 학생들의 흥미와 생명과학에 대한 자기주도적 학습에 유용한 자료임을 보여주었다.

고등학교 남녀 학생의 수학 능력에 대한 담론 연구 (A Study on the Discourses Related to Mathematical Aptitude in High School Students)

  • 권오남;박경미;임형;허라금
    • 대한수학교육학회지:수학교육학연구
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    • 제9권1호
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    • pp.351-367
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    • 1999
  • This study aims to study the discourses influencing high school students' concept and attitude toward mathematics, and to examine how gender differences concerning mathematical aptitude are created. This study is based on the results of previous two studies which suggested that mathematical competence differs not only according to gender, region and school year, but also even within the same gender. For this study, 12 students ranking in the top 10% at two co-ed high schools were interviewed to find out 1) what discourses are related to gender and mathematics, 2) in what way these discourses are formulated and gain currency, and 3) how they have affected students in general. Common notions concerning mathematics may be summed up as follows: 1) Most of the students believe that gender difference in mathematical aptitude results because biologically men tend to be strong in mathematics and analytical skills while women tend to have better linguistic ability. This concept can help male students' studying to have a greater learning toward mathematics. 2) A large number of the students believe that male students' studying method is based on comprehension whereas female students' method is based on retention, and hence the former group tends to be better at applying their learning than the latter group. This notion seres to encourage male students and discourage female students from tackling difficult mathematical problems. 3) Many students believe that, although female students may surpass their male counterparts in middle school or the first year of high school, they will eventually fall behind by the 3rd year. Despite research which shows that these common beliefs are not grounded in scientific proof, high-school girls, who may be strong in mathematics, lose self-confidence and feel a sense of crisis. The mechanisms which produce and reinforce such concepts as those mentioned above can be summarized as follows: 1) Regarding the choice of majors and future career paths, parents show different attitudes toward sons and daughters, and this tends to influence high-school girls and hinders them from entering mathematics-related fields. 2) Teachers with value systems based on stereo-typed gender roles affect students a great deal, and give different advice according to gender of their students, for selecting their major fields - for instance, whether to study the natural sciences as opposed to humanities. 3) This study indicates that peer-group behavior, of either support or exclusion, also reinforces the process of internalizing notions of gender difference related to mathematical aptitude. 4) The gender-based notion that men are naturally more inclined to have better mathematical ability has caused male students to choose the natural science subjects and female students to turn to the humanities. The discourses discussed above, propagated in schools and homes, and in the mass media, are continually reinforced along with general gender inequalities in the society at large.

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구립 공공도서관에 대한 지역주민의 인식 및 요구에 관한 연구 - 마포 구립도서관 이용자를 대상으로 - (Citizens' Needs and Perceptions of their Municipal Public Library Services)

  • 김선애;권나현
    • 한국문헌정보학회지
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    • 제54권2호
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    • pp.29-52
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    • 2020
  • 본 연구는 사회적 환경변화를 고려하면서 다양한 이용자들의 욕구를 충족시킬 수 있는 공공도서관 서비스체계를 구축하기 위해 서울시 마포구의 공공도서관 서비스체계를 점검하고, 공공도서관 이용자들의 인식과 요구를 분석하였다. 이를 위하여, 마포구의 공공도서관 이용자 800명과 비이용자 300명을 대상으로 독서경험, 도서관 이용 경험, 도서관에 대한 인식, 도서관서비스, 프로그램 및 도서관정책 등에 관한 지역주민의 요구를 조사하였다. 분석결과, 마포구민의 53.7%는 전체 공공도서관 중 2개관 이하를 이용해봤고, 주이용도서관을 선택하는 기준은 접근성이 63.9%였다. 그리고 전체 이용자의 53.8%만이 프로그램 참여경험이 있었다. 또한, 주민들은 도서관은 지역사회에 필요하며, 아이들을 위한 필수기관이라는데 강한 동의를 나타냈다. 도서관정책에 관한 요구사항은 장서의 양적 확대 및 콘텐츠의 다양화에 대한 요구가 가장 컸고, 도서관시설 등 환경개선 및 도서관 확충에 대한 요구도 많았다. 공공도서관이 지역사회 공동체의 중심공간의 역할을 충실히 수행하기 위해서는 접근이 편리한 생활권 중심에 설립되는 것이 중요하고, 장서의 확대, 주제 및 매체의 다양성 확충과 더불어 노후화된 도서관시설을 개선하여 쾌적하고 혁신적인 공간으로 개선하는 등의 노력이 필요하다.

외국어 원문 및 영문 초록

  • 한국환경교육학회
    • 한국환경교육학회지:환경교육
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    • 제4권1호
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    • pp.89-211
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    • 1993
  • The Korean government embarked upon ambitious economic development plans in the 1960's the goals of development policy at that time were the elimination of absolute poverty and the alleviation of unemployment. With scant natural resources, the government had to push for industrialization based upon borrowed foreign raw materials with surplus local labor. Preoccupation with the economic goals of industrialization and export expansion left little room for considering environmental protection. It is evident that Korea's exported industrialization strategy of the past three decades has been a success in terms of income, production, and other macroeconomic indicators, but it cannot be denied that a host of undesirable side-effects have been created. These include environmental problems. congestion in several large cities, poor wealth distribution, and regional disparities. The environmental problems were recognized even in the early stage of development, but preoccupation with the pending economic goals of industrialization and export expansion left little room for considering environment protection. The perceived and actual seriousness of the problems, however, has reached such a level that further negligence may imperil political stability and developmental problems facing the world arise from a world economic order characterized by ever expanding consumption and production, which exhausts and contaminates natural resources and creates and perpetuates gross inequalities between and within nations. It will be necessary to develop new culture and ethical values, transform economic structures, and reorient, our lifestyles. Changing lifestyles can not be promoted by government policy initiative alone but through self=generated educational efforts and mutual training by people themselves. The citizens group for environment (NGOs) should assume these educational and training responsibilities starting from grass-root level of people. It must be reawakened to the reality that the environmental preservation for better quality of life is based on the development of human relationships, creativity, spirituality, reverance for the natural world and celebration of life, and is not dependent upon increased consumption of non-basic material goods. To carry on such environment education social movements and NGOs should (1) provides educational methodologies, which focus on values clarification and moving beyond clarification and moving beyond blame to constructive action. (2) provide training for leaders of business and industry, government, union and others on consumption and production. (3) initiate and support the training and work of environmental counselor who encourage responsible consumption. (4) cooperative with media to initiate and strengthen educational programs on the social environmental programs on the social environmental impacts of consumption and production and to build awareness of consumer responsibility and potential. Economic and social development can be compatible with environment protection : both can be achieved simultaneously. Effective environmental management depends on the various factors : political will, institutional arrangements, appropriate legislation, and availability of the requistite financial and technological resources, which is possible with a strong public awareness of the importance of environmental preservation.

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고등학생들의 음란 영상매체 접촉 실태 (A Study on the Current Status of High School Students' Exposure to Pornographic Materials)

  • 김한숙
    • 한국보건간호학회지
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    • 제16권1호
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    • pp.45-63
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    • 2002
  • The purpose of this study is to understand the current status of high school students' exposure to pornographic materials as well as to provide basic data to develop sex education programs. This study was conducted through a self-administered questionnaire survey of 774 students of six high schools in Seoul, three boys' and three girls' respectively, from August 22 to August 25, 2000. This study shows that high school students' exposure to pornographic materials such as CD-ROMs, internet, video tapes and adult movies has become very serious. The results of this study are as follows. 1. Among the students surveyed, $23.5\%$ of them currently has opposite-sex friends, while $42.2\%$ used to have and $34.2\%$ has never had opposite-sex friends. 2. $55.3\%$ of the students pick up their sexual knowledge from their friends, followed by mass media $(47.5\%),\;school (21.1\%),\;adult\; magazines (17.1\%)\;, internet (14.1\%)$, pornography visual $materials (11.5\%),\; sexual\; books (3.6\%)$ and pornography printed $materials (2.4\%).$ 3. Regarding the frequency of sexual education taken in school, $54.2\%$ of the students answered 'often', while $37.6\%$ answered 'almost none', 'several times' $(4.4\%)$, 'never' $(2.9\%)$ and 'frequently' $(0.9\%)$, respectively. Regarding sexual education at home, $42.2\%$ answered 'almost none', followed by 'never' $(36.3\%)$, 'often' $(16.3\%)$, 'several times' $(3.3\%)$ and 'frequently' $(1.8\%)$, respectively. 4. $68.2\%$ of the students have been exposed to adult movies, followed by pornography videos $(60.1\%)$, internet chatting $(50.2\%)$ and pornography computer diskettes $(38.0\%)$. 5. The degree of exposure to pornographic materials of boy students is much higher than that of girl students. 6. It appears that there is an interrelation between the kind of schools and the degree of the students' exposure to pornographic materials. 7. The higher the students' grade is. the more they have been exposed to pornographic materials. 8. It shows that there is an interrelation between the students' academic performance and the degree of their exposure to pornographic materials. 9. There is also an interrelation between the amount of students' pocket money and the degree of their exposure to pornographic materials. 10. There is an interrelation between the degree of their adaptation to school life and the degree of their exposure to pornographic materials. 11. It appears that there is an interrelation between their parents' relations with them and the degree of the students' exposure to pornographic materials. 12. There is a significant difference in the degree of their exposure to pornographic materials in accordance with their residential area. 13. There is also a significant difference in the degree of their exposure to pornographic materials in accordance with the average income of their families. 14. There is also a significant difference in the degree of their exposure to pornographic materials in accordance with the mean sexual education at home.

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유암환자의 제 특징 및 유암에 관한 태도와 그 인식도 (Characteristics of Breast Cancer Patients, their Understandings and Attitude towards the Disease)

  • 노유자
    • 대한간호학회지
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    • 제7권1호
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    • pp.30-38
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    • 1977
  • Breast cancer is one of the most feared health problems in women ; Recent studies revealed that it had come up to be the second most in this country and high prevalent disease in the western countries among breast disease in women. However, early detection of the cancer mass is known to be easier than in many other malignancies. This study was performed to investigate the various characteristics of patients of breast cancer ; by the structural variables, menstrual, marital, and child bearing, and also their understandings and attitude towards the disease. A hundred any in- and out- patients of 51. Mary's Hospital and National Atomic Institute, Seoul were sampled. Data were gathered through direct interview by the researcher from February 1976 to January 1977 and the clinical records were used as references. Results are as follows ; 1. Breast cancer revealed to be most prevalent in the forties ; average age of 45.2 years. 2. The average age of menarche revealed to be 15.4 years ; the largest group were the 16-20 years (N=75, 68.2%). In 55 cases (50%) menstruation were normal, 38 (34.5%) postmenopausal and only in 17 (15.5%), menstruation revealed irregularity. 3. The average marital age revealed to be 22.3 years ; the largest group were 21-25 group (N=43, 39.1%). The average duration of marital life revealed to be 24.7 years ; 11-20 years group were the largest (M=34, 30.9%). 4. Most of the patients revealed to have pregnancy experiences(N=100, 90.9%) ; the average rate of experience were 5, 3 times the largest group were 3.4 times group(N= 32, 29.1%). 54 patients (49.1%) revealed to have had abortion experience ; the average were 3.4 times. 5. The largest group(N=77, 70%) had been breast feeding : followed by mixed feeding (N=12, 10.9%) and artificial feeding(N=10, 9.1%). 6. Personal health history revealed that in 20 patients (18.2%) revealed to have the past history of Purulent mastitis, 5 patients(4.5%) of breast cancer and 3 patients(2.7%) of uttering cancer family history. 7. In the one half (N=56, 50.9%, they had some information about breast cancer :27 (24.5%) by mass media, 12 (10.9%) through personal contacts and 17 (15.5%) were not able to classify the source of information. 8. In 55 cases (50%) the canoe, mass were discovered incidentally, in 39 cases (35.5%) by manual detection by self, in 10 cases (9%) by others and in 6 cases(5.5%) by observing subjective symptoms. 9. The average duration lapsed between the discovery of cancer mass and the visit to the hospital revealed to be 9.4 month. Chief reason for the delay revealed to be the non-chaplaincy due to the absence of pain(N=50, 45.5 %) followed by the administration of herb and commercial medication (N=19, 17.3%). 10. The left side breast was more affected than the right side breast, represent by 60 cases in the left and 39 cases in the right. The most frequent site of the breast cancer was the upper- outer quadrant in 53 cases (47.7%), and followed by the center in 20 cases(18 %), and the upper inner quadrant, in 19 cases (17.1%). There was / cases of bilateral carcinoma. The most prominent symptom was painless mass.

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어린이의 치아 외상에 대한 전라북도 초등학교 교사들의 인식도 조사 (A SURVEY ON THE KNOWLEDGE AND AWARENESS OF TRAUMATIC DENTAL INJURIES IN A GROUP OF JEON-BUK PROVINCE ELEMENTARY SCHOOL TEACHERS)

  • 이제우;이광희;라지영;안소연;김윤희
    • 대한소아치과학회지
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    • 제39권2호
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    • pp.120-128
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    • 2012
  • 본 연구는 전라북도 지역 초등학교 교사에게 적합한 치아외상 교육내용 및 효과적인 전달 방법이 마련될 수 있도록 치아외상에 대한 지식수준을 파악하고 기존 연구에서 자세히 다루지 않았던 교육현황을 조사하는 데 그 목적이 있다. 전북지역 초등학교 교사 231명에게서 설문지를 통하여 자료를 수집하였으며 설문 문항은 응답자의 일반 사항, 치아외상 교육현황 및 태도, 사례를 통한 지식수준, 치아 보관 매체에 대한 질문으로 구성하였다. 조사 결과 치아외상 대처방법에 교육을 받은 교사는 15.2%에 불과하였고, 교사들을 대상으로 치아외상 대처방법에 대한 교육이 필요한지에 대한 질문에서는 97%가 필요하다고 대답하여 교사 스스로도 치아외상 교육의 필요성에 대해 공감하고 있었으며 교육 방식으로는 전문가에 의한 직접 교육을 선호하였다. 사례를 통한 평가에서는 문항 간에 다소 차이는 있었으나 응급상황시 적절히 대처하기에는 지식수준이 대체로 불충분한 것으로 나타났다. 따라서 향후 전라북도 초등교사들에게 적합한 교육방식과 교육내용을 객관적으로 분석하는 연구 및 교사들에게 알맞은 교육 프로그램의 개발 등이 필요하리라 사료된다.

울산지역 중학교 여학생의 비만실태에 관한 연구 (Obesity among Secondary School Girls in Ulsan Area)

  • 김혜경
    • 동아시아식생활학회지
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    • 제6권1호
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    • pp.33-39
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    • 1996
  • 울산시의 여중생을 대상으로 비만 실태와 이에 영향을 미친다고 생각되는 일반환경요인, 식 습관과 식품섭취빈도, 영양지식 등을 조사한 결과는 다음과 같다. 1. 조사대상자의 평균 연령은 13.7세(12-15세)이고, 평균 신장과 체중은 각각 155.0cm, 46.6kg을 나타냈으며, BMI에 의한 비만율은 4.5%이었고 평균 BMI는 19.3을 나타냈다. 가족 수는 4-5명이 가장 많았고, 아버지와 어머니의 연령은 40-49세가 대부분을 차지하였고 거주형태는 아파트(52.8%)가 가장 많았다. 부모의 학력은 모두 고졸이 많았으며 월수입은 81-120만원(43.6%)이 가장 많았다. 2. 식 습관 조사에서는 부모의 편식율은 15.2%로 낮으나 조사대상자의 편식율은 48.1%로 높게 나타났다. 부모의 가려서 먹지 않는 편식식품은 돼지고기, 나물류, 복숭아로 나타났고, 조사대상자 자신의 편식식품은 양파, 육류, 생선, 계란, 버섯, 김치, 콩 등 종류가 다양하였다. 운동을 규칙적으로 하는 경우는 42.0%이었으며, 종류로는 가볍게 할 수 있는 줄넘기(32.5%), 배드민턴(16.7%), 달리기(11.5%) 등이 있었으며, 구기종목인 농구, 배구, 피구는 학교 체육수업 중에 하는 것으로 보인다. 그밖에 훌라후프, 수영, 테니스, 자전거, 걷기 등을 하는 것으로 나타났다. 3. 식품섭취 빈도점수는 평균 36.6점(10-61점)이 나왔고 상대적으로 BMI 21이상군에서 유의적으로 더 높게 나왔다(p<0.05). 간식으로 섭취하는 음식의 종류에서는 우유가 82.2%로 가장 높게 나타났고, 다음은 과자류, 아이스크림, 빵, 라면, 떡볶이, 요플레 순으로 나타났다. 4. 비만과 관련된 일반적인 영양지식은 10문항의 조사결과 10점 만점에 평균 6.5점(2-9점)으로 대체로 높게 나타났는데 이는 대중매체와 신문, 잡지류를 통한 지식의 정보가 많기 때문으로 생각된다 비만 정도에 따라서는 유의적인 차이를 보이지 않았다. 5. 비만 정도와 상호간의 관계를 보면 BMI 수치가 높을수록 비만인 형제수가 많았으며, 자신의 비만 자각도도 높았다. 편식율은 비만 정도가 낮을수록 높았으며, 식품섭취 빈도 점수는 비만군에서 높았으나, 저녁식사 후 간식섭취는 BMI가 높은 군에서 하지 않는 비율이 더 높았는데 이것은 감수성이 예민한 여학생들이 자신의 외모에 대한 의식적인 노력으로 보인다. 이상과 같은 결과를 종합해 볼 때 중학교 여학생들은 학교수업을 중심으로 비교적 규칙적인 생활을 하고 따로 운동을 할 시간이 많지 않은 것으로 나타났다. 비만과 관련하여서는 유전적인 요인도 중요하지만 식습관 개선과 식품이 적절한 선택 등을 강조하여 연령과 생활환경에 맞는 영양교육이 필요하다고 본다.

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