• 한국환경과학회지
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• 제25권4호
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• pp.505-516
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• 2016

With the development of nanotechnology, nanomaterials are used in various fields. Therefore, the interest regarding the safety of nanomaterial use is increasing and much effort is diverted toward establishment of exposure assessment and management methods. Occupational exposure limits (OELs) are effectively used to protect the health of workers in various industrial workplaces. This study aimed to propose an OEL for domestic multi-walled carbon nanotubes (MWCNTs) based on animal inhalation toxicity test. Basic procedure for development of OELs was examined. For OEL estimation, epidemiological study and quantitative risk assessment are generally performed based on toxicity data. In addition, inhalation toxicity data-based no observed adverse effect level (NOAEL) and benchmark dose (BMD) are estimated to obtain the OEL. Three different estimation processes (NEDO in Japan, NIOSH in USA, and Baytubes in Germany) of OELs for carbon nanotubes (CNTs) were intensively reviewed. From the rat inhalation toxicity test for MWCNTs manufactured in Korea, a NOAEL of $0.98mg/m^3$ was derived. Using the simple equation for estimation of OEL suggested by NEDO, the OEL of $142{\mu}g/m^3$ was estimated for the MWCNT manufacturing workplace. Here, we used test rat and Korean human data and adopted 36 as an uncertainty factor. The OEL for MWCNT estimated in this work is higher than those ($2-80{\mu}g/m^3$) suggested by previous investigators. It may be greatly caused by different physicochemical properties of MWCNT and their dispersion method and test rat data. For setting of regulatory OELs in CNT workplaces, further epidemiological studies in addition to animal studies are needed. More advanced technical methods such as CNT dispersion in air and liquid should be also developed.

• 한국조리학회지
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• 제22권7호
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• pp.203-221
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• 2016

본 연구는 커피전문점의 서비스스케이프가 고객의 지각된 가치와 브랜드 태도에 미치는 영향을 살펴보고 최근 포화상태에 직면해 있는 커피전문점의 질적인 향상과 효과적인 마케팅 전략의 시사점을 제공하고자 하였다. 그 결과를 요약하면 다음과 같다. 첫째, 커피전문점 이용행동 특성을 분석한 결과, 커피전문점 이용 시 지출비용은 21,000~30,000원(43.9%)이, 커피전문점 방문빈도는 1주에 2~3회 정도(25.1%)가, 브랜드 커피전문점을 이용하는 가장 큰 동기(이유)는 커피 메뉴의 맛(39.7%)이, 커피전문점 이용 시 동반자는 친구(53.5%)가, 커피전문점 이용정보는 지인 또는 주위 권유(29.3%)가 가장 높게 나타났다. 둘째, 심미성, 좌석의 안락성, 청결성, 대기환경, 접근성 등의 서비스스케이프가 높을수록 지각된 가치가 높게 나타났으며, 특히 커피전문점 실내장식의 매력성, 바닥과 벽의 색상의 어울림, 데코레이션의 우수성, 건물 외관의 매력성 등의 심미성을 높이는 것이 지각 가치를 높이는 데 가장 큰 영향력을 미치는 것으로 나타났다. 셋째, 심미성, 청결성, 대기환경, 접근성 등의 서비스스케이프가 높을수록 브랜드 태도가 높게 나타났다. 넷째, 고객의 지각된 가치가 높을수록 브랜드 태도가 높아지는 것으로 나타났다. 본 연구를 통해 커피전문점의 실내장식과 아늑한 분위기가 방문 고객에게 무형적인 서비스로써 긍정적인 가치와 우호적인 반응을 일으킬 수 있으며, 고객의 감각을 배려한 인테리어 컨셉과 시각적 효과를 보이는 것이 브랜드 태도에 긍정적인 영향을 줌으로 이러한 심미적 환경을 잘 개발할 필요가 있다고 사료된다. 또한, 커피전문점을 방문하는 고객들이 기본적으로 사용할 수 있는 각종 시설에 대한 청결 유지와 고객의 이동 방향을 고려한 매장관리 및 고객 편의를 증대를 위한 해당 브랜드의 이미지를 강조한 표지판과 안내, 주차시설 및 부대시설의 개선 및 관리로 청결성과 접근성을 확보하는 것이 고객의 지각된 가치와 브랜드 태도를 높일 수 있는 방안이라 사료된다.

• Child Health Nursing Research
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• 제20권4호
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• pp.247-254
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• 2014

목적 본 연구의 목적은 산전 임부를 대상으로 태아애착, 태교실천, 피로 및 사회적 지지 정도를 확인하고 태아애착에의 영향 요인을 파악하는 데 있다. 방법 대상자는 월평균 분만 100건 이상의 여성전문병원에 산전관리를 위해 외래를 방문한 임부 중 임신합병증을 동반하지 않은 건강한 임부 211명이다. 일반적 특성에 따른 태아애착의 차이를 비교하였으며 태아 애착을 평가하기 위한 Maternal-Fetal Attachment Scale, 태교실천은 Mun과 Choi (2002)의 도구, 피로를 측정하기 위해 Milligan 등(1997)이 개발한 Fatigue Symptom Checklist 및 Curry 등(1994)의 사회적지지 측정도구를 사용하였다. 수집된 자료는 SPSS WIN 18.0 프로그램을 이용하여 기술통계, t-test, ANOVA, Pearson's correlation coefficients, Stepwise multiple regression analysis를 이용하여 분석하였다. 결과 임부의 태아애착 정도는 $93.74{\pm}13.69$점(점수범위 25-125점)이었으며 산과력, 모유수유 경험 및 태교 경험에 따라 유의한 차이를 보였으며, 초임부, 모유수유 경험이 없는 경우, 태교 경험이 있는 경우 태아애착 정도가 유의하게 더 높았다. 임부의 태아애착은 태교실천(r=.71, p < .001), 피로(r=.15, p =.032), 사회적 지지(r=.38, p <.001)와 정적 상관관계에 있었고 태교 실천 정도는 사회적 지지 정도와 유의한 정적 상관관계를 보였다(r=.40, p <.001). 임부의 태아애착에 영향을 미치는 요인으로는 태교실천(${\beta}=.67$), 피로(${\beta}=.21$), 사회적 지지(${\beta}=.13$) 순으로 나타났으며 설명력은 55.2%였다. 결론 임부의 태아애착 증진을 위해 태교실천 및 태교실천 프로그램 효과를 입증하는 하나의 근거자료로 활용될 수 있을 것이며 임부의 피로를 단순히 임신증상으로 인식하는 수준에서 벗어나 이를 태교실천을 통해 중재하는 것이 필요할 것이다. 또한 사회적 지지를 통해 태교실천을 더욱 더 잘 실천함으로 태아애착이 증진될 수 있을 것이다.

• 지역사회간호학회지
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• 제18권1호
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• pp.165-176
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• 2007

Purpose: The purpose of this study was to investigate the needs of home care nursing services in relation to the patients in hospital. Method: Subjects were 129 patients who admitted hospital and were selected through convenience sampling. Data were collected using the Home Health Care Need Assessment Questionnaire constructed by the Korea Health Industry Development Institute. Data were analyzed using SAS 8.12 program by applying percentage. Results: 1. According to the diagnosis of the subjects, the majority had cancer (25.0%), followed by musculoskeletal disease (15,6%), neuro/cerebral vascular disease (14.1%), digestive (10.9%) and respiratory disease (10.9%). 2. With regard to fundamental nursing service, subjects wanted to receive home care services for the following reasons: Problem identification and diagnosis (77.5%), vital sign check (49.6%); and intake and output measure (20.9%). 3. With regard to clinical laboratory tests, 62.8% wanted to receive blood tests, and followed by urine tests 26.4%, and wound drainage 26.4%. 4. With regard to medication and treatment service, 40.3% of the subjects wanted to receive intravenous fluid therapy, 26.4% intravenous antibiotics, and 26.4% the monitoring of fluid therapy. 5. With regard to therapeutic nursing service, 33.3% wanted to receive wound care, 26.4% ROM exercise, and 27.9% foley catheter change and care. 6. With regard to educational needs, 42.6% wanted education on infection monitoring, 41.4% on medication, and 34.9% on diet. 7. With regard to counseling needs, 65.9% wanted to receive telephone counseling about patient condition, 52.7% counseling about re-admission and 51.9% direct counseling about patient condition. In the group of injury and toxicity, and cardiovascular/circulatory diseases, 100% wanted telephone and direct counseling about the patient condition. Conclusion: Therefore, in order to improve the quality of hospital based home health care services, various factors that affect to the need of home health care should be analyzed and specified nursing care should be looked into.

• 콘크리트학회논문집
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• 제21권4호
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• pp.431-439
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• 2009

이 연구는 순환골재 콘크리트의 활용성 증대 및 규준 정립에 관한 연구의 일환으로, 순환굵은골재 및 순환 잔골재 치환율에 따른 실규모 철근콘크리트 보의 휨거동 특성을 실험적으로 수행하고자 실험체를 총 7개로 제작하여 최종파괴시까지 변위제어 방식에 의해 4점 가력하였다. 흡수율 3.0%, 절건밀도 2.49 g/cm3의 순환굵은골재를 치환한 실 험체를 천연골재 실험체와 비교한 결과, 초기강성은 동등하였으며 순환굵은골재를 고품질과 저품질로 구분하여 혼합굵 은골재를 치환한 실물모형 보 부재의 휨성능 또한 현행 설계기준에서 규정하는 휨내력을 만족하는 것으로 나타났다. 순 환잔골재를 100% 치환한 실험체에서도 천연골재 실험체와 유사한 거동을 나타냈으며, 모든 실험체의 실험값은 KCI 설 계기준식과 비교한 결과 기준값을 안전측으로 평가하고 있어 순환골재를 사용한 휨부재 설계에 적용 가능할 것으로 판 단된다. 따라서 순환골재 콘크리트의 활용성 증대라는 측면에서 순환골재 콘크리트로 제작된 RC 부재는 구조용 휨 부 재로의 적용이 가능한 것으로 판단된다.

• 초등상담연구
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• 제5권1호
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• pp.43-63
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• 2006

This study aims at examining effects of study skills training on elementary school children's self-directed learning ability. To achieve this goal, the following hypotheses were built. Hypothesis 1. There are significant differences in self-directed learning ability between experimental and control groups. Hypothesis 2. There are significant differences in study skills by self-directed learning ability in the experimental group. To test these hypotheses, two classes in the fourth grade were selected from S Elementary School in the city of Busan for experimental and control groups, each of which consisted of 23 children: seven for the advanced group, eight for the intermediate group, and eight for the lower group according to self-directed learning ability. The experimental group participated in twenty sessions of study skills training while the control group went through no treatment. The study skills training program was the reconstruction to meet the requirements of this study in reference to domestic study skills training programs on the basis of the Study Skills Training Program for Elementary School Children in the Higher Grades developed by Byeon and others (2001), The effects of the program was tested by using the Study Skills Test for Elementary School Children in the Higher Grades developed by the educational institute of Busan National University (Bye on et al., 1999) and Lee's (1998) translation of the Self-Directed Learning Preparation Test by Guglielmino (1977) for elementary school children. To analyze the effects of the program, the SPSSWIN (10.0) program was used to carry out ANCOVA on results of pretest and post-test for experimental and control groups, along with repetitive one-way ANOVA to examine differences in results of pretest, post-test, and further test and an individual comparative test (Scheffe) to see differences in means of the three tests. This study obtained the following results. First, there were significant differences in marks for self-directed learning ability between the experimental group participating in study skills training and the control group and the effect was shown to last. Second, in terms of three levels of self-directed learning ability, there was no significant difference between advanced and intermediate groups in the effects on study skills but there were significant differences in the lower group. The results demonstrated that study skills training had a significant effect on their self-directed learning ability. and the study skills training program had a meaningful effect on the lower group.

• 한국정보시스템학회지:정보시스템연구
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• 제26권4호
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• pp.247-284
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• 2017

Purpose The first purpose of this study is to investigate factors that are likely to influence user's intention to adopt third-party mobile payment platform. A comprehensive study about mobile payment services have used various variables to explain user's use intention based on the theory of reasoned action (TRA) or the theory of planned behavior (TPB). Variables such as simplicity, security, costs, relative advantage, individual mobility, subjective norm, trust, satisfaction, attitude towards use, perceived usefulness, perceived ease of use and so on. Among these factors, we expect to find out the most influential factors effecting user's use intention of the third-party mobile payment services. Second, we also examine whether the most influential factors have the same influence to different third-party mobile payment services by conducting comparative study of Alipay and WeChat Pay. Design/methodology/approach Empirical data for this study were collected from Chinese who has the experience using or have used Alipay or WeChat Pay. Participants needed to be familiar with Alipay or WeChat Pay because such users may be more aware of both the advantages and disadvantages of Alipay and WeChat Pay. We conduct a pilot test using Smart PLS 2.0, which includes 50 Alipay users and 82 WeChat Pay users. The result indicates that all the measurement fit for the context. And then 980 questionnaires were mainly sent out to the college students and the e-mails users randomly. To encourage participation, we give the participants a small gift as a present. Finally, we received a total of 683 replied. Data from respondents who gave incomplete or invalid answers were excluded to assure the validity of the constructs. 79 questionnaires were rejected, finally the valid data are 604 (with 372 Alipay users and 232 WeChat Pay users). Findings The results suggest that users' intention is determined by their trust on third-party mobile payment service and perceived usefulness of use. Comparative study results also indicated that the factors have different influence on Alipay group and WeChat Pay group, which offers a new aspect for academic field, and provides useful information to mobile payment service providers in China.

• Journal of Acupuncture Research
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• 제23권1호
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• pp.1-14
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• 2006

Background : Recently, so many people are suffered from the allergic or auto-immune disease, and the representative disease is just Allergic Asthma. It is because human immune function has been decreased. Many treatments were done to treat this disease, and many methods were studied to increase immune function and to suppress the asthma. But, the effect of asthma-suppression and improvement of immune response of EH-HA(Ephedrae Herba Herbal Acupuncture) has not been studied in detail. To study the effects of EH-HA, we injected EH-HA at Joksamni(ST36) of C57BL/6 mice. Objectives : The purpose of this study is to investigate the effect of asthma-suppression and improvement of immune response of EH-HA(Ephedrae Herba Herbal Acupuncture). EH-HA was done at Joksamni(ST36) of the mice with ovalbumin-induced asthma. Methods : C57BL/6 mice were sensitized and challenged with OVA(ovalbumin) for 12 weeks. Two experimental groups were treated with different concentrations(1%, 0.1%) of EH-HA at Joksamni(ST36) for the later 8 weeks(3times/week). Results : 1. The lung weight of the group treated with EH-HA decreased significantly compared with that of control group. 2. The total cells in lung, total leukocytes and eosinophils in BALF of the group treated with EH-HA decreased significantly compared with those of control group. 3. Eosinophils in BALF of the group treated with EH-HA in photomicrographs decreased significantly compared with those of control group. 4. The concentrations of IL-13, IgE, IL-4 in serum and IL-4 in BALF of the group treated with EH-HA decreased significantly compared with those of control group. 5. The numbers of $Gr-1^+/CD11b^+\;cells,\;CD3e^-/CCR3^+\;cells,\;CD4^+\;cells,\;CD8^+\;cells,\;CD3e^+/CD69^+\;cells\;and\;IgE^+/B220^+\;cells$ in lung of the group treated with EH-HA decreased significantly compared with those of control group. 6. In RT-PCR, the mRNA expression of IL-4, IL-5 and IL-13 in the group treated with EH-HA decreased compared with those of control group. Conclusion : These results suggested that EH-HA at Joksamni(ST36) in C57BL/6mice may be effective to OVA-induced asthma of C57BL/6 mice.

• 대한치과교정학회지
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• 제25권3호
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• pp.263-271
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• 1995

Canine retraction spring과 같은 looped wire에서, 각 변환요소에 따라 변하는 탄성 정도를 알아보기 위하여, wire의 재료, 굵기, loop에 소요된 길이, loop의 모양, gabling의 여부 등 5가지의 변환요소를 설정하여, 각 wire activation시의 탄성을 range, force, stiffness등의 면에서 알아보고자 하였다. wire의 재료적인 면에서 Hi-T (Unitek Co.)와 blue Elgiloy (Rocky Mountain Orthodontics)를 선택하였으며, 굵기로는 .016"$\;\times\;$.022" 와 .018"$\;\times\;$.025"를 선택하였다. loop 자체에 소요된 wire 길이를 15mm와 20mm의 두가지로, loop의 모양을 vertical open loop과 vertical closed loop의 두가지로, gabling의 양을 $0\circ$와 $30\circ$의 두가지로 하여 각각 제작하였다. 따라서 wire의 재료와 굵기, loop의 길이와 모양, gabling의 5가지 변환요소에 따라 32개군으로 구분되었으며, 각 군의 시료수는 8개씩으로, 총 256개의 시료를 대상으로 하였다. Instron(4202, Instron Co, USA)을 사용하여 각 시료의 하중변형 곡선을 얻었으며 elastic limit에서의 하중과 변형을 계측하고, 그때의 stiffness(force/range)를 산출하여, ANOVA 등의 통계처리로 32개군 간의 상관성을 조사하였다. 그 결과 wire의 재료, 굵기, loop의 길이, 모양, gabling모두가 looped wire의 하중 변형도에 유의한 영향을 미치는 것을 관찰할 수 있었으며, 탄성범위에서의 force는 Hi-T, .016"$\;\times\;$.022", loop 길이 20mm, open loop, non-gable군에서 가장 적었으며, blue Elgiloy, .018"$\;\times\;$.025", loop 길이 15mm, closed loop, non-gable군에서 가장 컸다. 탄성범위에서의 range는 Hi-T, .018"$\;\times\;$.025", loop길이 15mm, open loop, non-gable군이 가장 적었으며, Hi-T, .016"$\;\times\;$.022", loop길이 20mm, closed loop, gable군에서 가장 컸다. 또한 Looped wire의 탄성에 가장 큰 영향을 미치는 변환요소는 loop의 모양과 길이였으며, gabling의 영향이 가장 적었다.

• 건축역사연구
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• 제12권1호
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• pp.25-41
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• 2003

This paper is a study of Le Corbusier's trace regulateur of the 1920s, particularly its role in the design of the Villas La Roche-Jeanneret and Stein-de Monzie. It proceeds on the basis of the following three themes: first, the relation between the regulating line and the dom-ino frame; second, its status as a proportional device based not on a module system but one that defines relations; third, its function as an essential practical device in the design process. In the Villa La Roche-Jeanneret, the embedded horizontal planes of the dom-ino frame were constant, but the vortical lines of the columns were altered according to the changes in plan. Initially, a left-hand bay window formed a symmetry with the right-hand bay window, the only constant in the design process. With subsequent changes, mullion sections of the horizontal window and roof elements came to provide the reference points for the regulating line. Eventually, a regulating line different from the one that controlled the bay window and the elongated volume came to control the entrance hall of Villa La Roche, resulting in three different kinds of regulating lines in the final version. In contrast to the Villa La Roche-Jeanneret, a singular and consistent regulation line was anticipated in the earliest design stages of the Villa Stein-de Monzie. The repetition of its A:B grid and the standard $2.5m{\times}1.0m$ sliding window determined the proportions of both its plan and elevation, and thus the regulating line became 'automatic,' losing its viability as a practical tool. Though the regulating titles of the La Roche-Jeanneret look as if they were an afterthought, drawn after the design was complete, they were most active, requiring tenacity and discipline in their application. On the other hand, the seemingly 'redundant' regulating line of the Villa Stein-de Monzie gains its raison d'etre from the dom-ino frame. Its cantilevers and uninterrupted horizontal window could be used in decisive fashion because of the guarantee that the correct proportion would always be maintained. Thus we discover that Le Corbusier's discipline of the 1920s had a certain spectrum of flexibility. His 'parti' ranged from the extremely loose and malleable grid of the Villa La Roche-Jeanneret to the fixed grid of the Villa Stein-de Monzie. In different ways, these projects retain the tension between the dom-ino frame and the regulating line. For Le Corbusier, as much as the grid was an object with fixed attributes, it was also an active medium manipulated by the will of the architect.