• 한국치위생학회지
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• 제18권3호
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• pp.311-321
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• 2018

Objectives: The purpose of this study was to provide basic data on the current status and ways to improve the dental hygiene society by investigating working conditions, working experience, dental institution types among some dental hygienists, and ways to improve the dental hygiene society. Methods: This study conducted an online survey to 450 graduates of the department of dental hygiene in colleges in Gyeonggi, Jeolla and Gangwon Provinces. This study got some help in securing the list of graduates from the heads of the departments. SPSS WIN 23.0 was used to analyze the data. Results: To questions on what is the most important thing in considering to apply for jobs, the highest proportion (39.1%) of respondents designated employee welfare, followed by improvement of clinical dental hygiene (34.0%), of welfare related contents (26.0%), and salary (19.5%). In the relationship between employee welfare and dental institution type and between employee welfare and work experience, employee welfare tend to rise with the increase of work years. In the relationship between the director and staff members, it was found that as work years accumulate, the relationship tends to decrease. The dental clinic with no more than five staff members showed the best relationship between the leader and co-workers, while employee welfare was the highest in the other types of clinics, and the differences were statistically significant. Conclusions: Dental hygienists need to make various efforts to improve their statuses as professionals. In order to secure a part of professionalism, it is necessary for them to make more efforts to realize the health-care professionals being promoted by the Dental Hygienists Association of Korea.

• 센서학회지
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• 제8권1호
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• pp.24-31
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• 1999

감도가 우수하고 동작온도가 낮으며 반응속도가 빠른 암모니아 가스 센서를 제작하기 위해 ZnO에 촉매불순물 $MoO_3$의 첨가비와 박막 성장분위기 가스를 변화시키면서 RF 마그네트론 스펏터링 방법으로 박막을 성장하였다. 전기적 안정성을 향상시키기 위해 성장된 박막들을 aging 하여 센서를 제작한 후 암모니아 가스의 검지 특성을 조사하였다. 촉매불순물을 첨가하거나 산소분위기에서 성장된 박막의 경우 감도가 향상되었으며, 이는 표면 캐리어 농도와 전자이동도의 증가를 나타냈다. ZnO에 $MoO_3$를 무게비로 0.875 wt.% 첨가한 박막으로 제작한 센서가 160 ppm의 암모니아 가스 농도와 $300^{\circ}C$의 동작온도에서 70정도의 최대감도를 보였다. 산소분위기에서 $330^{\circ}C$로 72시간 동안 aging한 박막으로 만든 센서는 감도가 57정도로 감소하였으나, 센서의 동작온도가 $250^{\circ}C$로 낮아졌고, 선형성이 좋았으며 더 안정된 특성을 나타냈다.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2009년도 춘계학술대회
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• pp.79-91
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• 2009

The government separated and established the industrial safety and health law from the Labor Standard law since 1981 to promote the labor's working environment and to improve the conditions of laborers. The government made a lot of effort to discharge the industrial safety and health law by continuous revision of the law thereafter. it is, however, difficult to establish clear-cut lines of authority and responsibility due to the fact that the substantial application of the industrial safety and health law is adapted by enterprise's autonomous management. There are frequent industrial disasters on the small and medium enterprises which have financial difficulty and it means this causes much more social cost. Finally, for the improvement of laborer's safety, health and working environment in the small and medium enterprises we need to raise the effectiveness of the industrial safety and health law through enhancing a government-office's administration and surveillance with the changing mind of a business proprietor. On this paper, we research on the actual condition of the administration, inspection and regulation of safety and health by means of the industrial safety and health law. Thereafter we analyze how much the Korea Occupational Safety & Health Agency and vicarious businesses of safety & health management help. we used the survey method to gather data from 380 laborers directly and analysed the data by SPSS v17.0.

• 한국산학기술학회논문지
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• 제14권4호
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• pp.1755-1764
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• 2013

본 연구는 노인요양시설에 근무하는 간호사와 요양보호사의 직무관련 소진에 영향을 미치는 요인을 확인하기 위한 서술조사연구이다. 연구의 대상은 서울과 경기지역 소재 5개소 노인요양시설의 간호사 77명과 요양보호사 111명으로 구조화된 설문지를 이용하여 자료를 수집하였다. 수집된 자료는 IBM SPSS Statistics 19.0의 독립표본 t-test, Pearson's correlation coefficients, and multiple stepwise regression으로 분석하였다. 간호사의 직무관련 소진은 직무만족(r=.333, p=.003), 스트레스(r=.484, p<.001)와 양의 상관관계가 있었으며, 요양보호사의 직무관련 소진은 스트레스(r=.458, p<.001)와 양의 상관관계가 있는 것으로 나타났다. 간호사의 직무관련 소진에 영향을 미치는 요인은 대인관계 스트레스였으며 이는 간호사의 직무관련 소진의 27.0%를 설명하고 있었다. 요양보호사의 경우는 직무관련 스트레스로 나타났으며 이는 요양보호사의 직무관련 소진의 21.2%를 설명하고 있었다. 이와 같은 연구결과를 바탕으로 근무환경의 개선과 체계적인 스트레스 관리 프로그램의 개발이 이루어져야 할 것이다.

• 한국철도학회논문집
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• 제16권3호
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• pp.233-239
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• 2013

본 논문에서는 개인은 물론 조직에 치명적인 해악을 초래하고 엄청난 경쟁력 상실을 가져오는 도시철도기관사의 스트레스를 알아보고 기관사의 직무 스트레스에 대처하는 방안들을 모색하였다. 도시철도기관사의 직무스트레스로 인하여 발생되는 여러 스트레스에 미치는 악영향의 요인을 최소한 줄이기 위해서는 첫째, 전문성 제고를 위한 교육훈련 확대 및 사고발생시 기관사에 대한 보호조치로 시설개선이 필요하다. 둘째, 정신적 보상이나 조직시스템 등이 직무스트레스를 유발하므로 경영자의 리더십 교육과 같은 전형적인 조직차원의 접근이 근본적인 문제를 해결할 수 있을 것이다. 셋째, 개인적 차원에서의 규칙적인 운동, 금주 등의 바른 생활습관으로 직무스트레스를 낮춘다. 넷째, 과도한 성과 지향과 불공정한 평가를 피하고 기관사의 심리상태를 이해함으로써 근무환경을 개선하고, 근무시간을 조정하는 등의 조직적 차원에서의 복합적인 건강증진 및 관리프로그램 등 제도적 장치를 마련하는 것이 필요하다.

• 한국ITS학회 논문지
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• 제18권2호
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• pp.1-11
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• 2019

대량수송이 가능한 대중교통 수단의 경우 사고 발생 시 대형인명피해가 우려되며, 이로 인해 다량의 사회적 경제적 손실이 발생할 가능성이 크다. 특히, 최근 들어 버스 운전자의 피로 및 부주의 등으로 인한 중 대형 버스사고가 잇따라 발생하며 버스사고 및 운전자의 근무환경에 대한 사회적 관심이 나날이 증가하고 있다. 이에 본 연구에서는 버스운전자의 근로 환경(업종별 근로 형태별)에 따른 근로여건 및 사고 특성을 비교 분석하고자 한다. 이를 위하여 국내 271개 버스회사에 대한 2017년 1월~12월까지의 운행기록계 자료 및 업체 정보(업종구분, 근로형태)를 수집하였으며, 이를 통계적 방법론을 활용하여 분석하였다. 그 결과 버스운전자의 근로조건에 따른 사고빈도 및 운행환경의 차이가 통계적으로 유의미한 것으로 나타났다. 특히, 격일제 근무 형태를 따르는 시내버스(특광역시 제외)에서 교통사고가 비교적 빈번히 발생함을 확인할 수 있었다. 본 연구의 결과가 향후 노선버스 사고 감소를 위한 근무여건 개선의 기초자료로 활용될 수 있기를 기대한다.

• 국제학술발표논문집
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• The 4th International Conference on Construction Engineering and Project Management Organized by the University of New South Wales
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• pp.335-339
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• 2011

The unique characteristics of the construction industry - such as the fragmentation of its processes, varied scope of works and diversity of its participants - are contributory factors to poor project performance. Several issues are unresolved due to the lack of a comprehensive technique to measure project outcomes including: inefficient decision making, insufficient communication, uncertain site conditions, a continuously changing environment, inharmonious working relationships, mismatched objectives within the project team and a blame culture. One approach to overcoming these problems appears to be to measure performance by gauging contractor satisfaction (Co-S) levels, but this has not been widely investigated as yet. Additionally, the key Co-S dimensions at the project level are still not fully identified. This paper concerns a study of satisfaction dimensions, primarily by a postal questionnaire survey of construction contractors registered by the Malaysian Construction Industry Development Board (CIDB). Eight satisfaction dimensions are identified that are significantly and substantially relate to these contractors - comprising: project cost performance, schedule performance, product performance, design satisfaction, site safety, project profitability, business performance and relationships between participants. -Each of these dimensions is accorded different priority levels of satisfaction by different contractors. The output of this study will be useful in raising the awareness and understanding of project teams regarding contractors' needs, mutual objectives and open communication to help to deliver a successful project.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.356-356
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• 2007

Plasma immersion ion beam deposition (PIIBD) technique is a cost-effective process for the deposition of diamond like carbon thin film, the possible solid lubricant on large surface and a complex shape. We used PIIB process for the preparation of DLC thin film on $Al_2O_3$ with deposition conditions of deposition temperature range $200^{\circ}C$, working gas pressure of 1.310-1Pa. DLC thin films were coated by $C_2H_2$ ion beam deposition on $Al_2O_3$ after the ion bombardment of SiH4 as the bonding layer. Energetic bombardment of $C_2H_2$ ions during the DLC deposition to ceramic materials generated mixed layers at the DLC-Si interface which enhanced the interface to be highly bonded. Wear test showed that the low coefficient of friction of around 0.05 with normal load 2.9N and proved the advantage of the low energy ion bombardment in PIIBD process which improved the tribological properties of DLC thin film coated alumina ceramic. Furthermore, PIIBD was recognized as a useful surface modification technique for the deposition of DLC thin film on the irregular shape components, such as molds, and for the improvement of wear and adhesion problems of the DLC thin film, high temperature solid lubricant.

• 한국기계가공학회지
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• 제15권1호
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• pp.136-144
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• 2016

The air-conditioning industry is closely related to types of lifestyles, climate, and products. With the improvement of national income, the pursuit of pleasant living and working environments, and South Korea's four seasons and distinct climatic conditions, demand for air conditioning has increased. In addition, the industry is becoming increasingly precise and cooperative, and the increase in the domestic production of sophisticated air conditioning and continued growth of future industrial cooperation are expected to rapidly rise. Accordingly, the study of air piping systems can improve the productivity and quality of products and cost savings and can achieve vibration reduction. Additionally, using a heat treatment furnace for copper tube annealing treatment reduces the risk of using an oxy-acetylene torch.

• International Journal of Air-Conditioning and Refrigeration
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• 제7권
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• pp.55-68
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• 1999

In this study, computer simulation programs were developed for single-stage, two-stage, and three-stage condensation heat pumps and their performance with CFC11, HCFC123, HCFC141b was examined under the same external conditions. The results showed that the coefficient of performance(COP) of an optimized 'non-split type' three-stage condensation heat pump is 25-42% higher than that of a conventional single-stage heat pump. The increase in COP, however, differed among the fluids tested. The improvement in COP is largely due to the decrease in average LMTDs in condensers, which results in the decrease in thermodynamic irreversibility in heat exchange process. For the three-stage heat pump, the highest COP is achieved when the total condenser area is evenly distributed among the three condensers. For the two-stage heat pump, however, the optimum distribution of the total condenser area varies with an individual working fluid. For the three-stage system, 'splitting the condenser cooling water'for the use of intermediate and high pressure subcoolers helps increase the COP further. When the individual cooling water entering the intermediate and high pressure subcoolers is roughly 10% of the total condenser cooling water, the maximum COP is achieved showing roughly an 11% increase in COP as compared to that of the 'non-split type' heat pump.