• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.376-379
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• 2004

The purpose of this work is to develop an effective active control system for combustion instabilities of premixed combustors. For the first step, the natural modes of combustion oscillation were investigated for a methane-air premixed combustor and the controls by secondary fuel injection were examined. The main premixed flame is stabilized by a swirler with orifices for secondary injection installed on the central hub. For sensing purposes, a pressure transducer and a chemiluminescence sensor were placed on the appropriate positions. The acoustic characteristics and the source of the oscillation were analyzed by those signals. To test the controllability, two methods of actuations by secondary fuel injection were examined. One is the open loop control and the other is the closed loop control. The comparison of the reduction levels of p $_{rms}$ shows that the closed loop control with a phase-shift injection performs best in this condition.ition.n.

• 보건교육건강증진학회지
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• 제22권3호
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• pp.13-28
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• 2005

Objectives: The purpose of this paper is to describe the role for public education in mental health promotion, prevention of mental illness and treatment of mental disorders in Canada. Results: A brief history of the changing nature of the way we treat mental disorders in Canada argues for an increasingly critical role for public education. Furthermore, the new understanding of the role of social determinants in prevention of mental illness again necessitates a vital role for public education as the shift in focus moves from exclusively individual-focused health care treatments to creating supportive environments. The roles for mental health public education then become: advocacy for the social determinants of health approach, better understanding of the nature of mental health problems, useful information for self-management, and more knowledge about appropriate treatments. A brief discussion of the structure of the response in Canada provides an overview of national and provincial responsibilities in mental health care with a case study highlighting one community's response to addressing mental disorders. Conclusion : Finally, challenges regarding the most effective educators and the issue of professional expertise embedded in the status quo are discussed.

• 한국병원경영학회지
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• 제4권2호
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• pp.1-20
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• 1999

Objectives: Quality of Working Life(QWL) is a set of employee's physical, mental conditions which are perceived at their work. Most employees and managers are concerned about the quality of working life as a strategy for improving organizational effectiveness. The purpose of this study is to investigate the relationship between QWL and organizational effectiveness of employees at the general hospital. Methods : Data were collected by self-administered questionnaires at the general hospital in Kyunggi-Do. Survey was conducted to 675 workers. QWL was measured by using 5 items from the scale developed by Walton(1973). Organizational effectiveness was measured by measuring organizational commitment, intention of job-shift, and job satisfaction. Results: The recognitions to each component of QWL were significantly different by socio-demographic characteristics such as sex, age, education levels and working duration. Also, QWL were significantly different by types of organizational culture. Multiple regression analysis and multiple logistic regression analysis were applied to find the relationship of QWL and organizational effectiveness. As a result, job-pride, compensation, working condition, human relationship and development showed significant relationship with organizational effectiveness. Conclusions: These results show that QWL is significantly related to organizational effectiveness. So we expect that this result will be used as basic informations for management and motivation of employees at the general hospital.

• Journal of Korean Biological Nursing Science
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• 제17권1호
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• pp.19-27
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• 2015

Purpose: The aim of this study was to identify the effect of video programs of cardiopulmonary cerebral resuscitation (CPCR) education of cardiopulmonary cerebral resuscitation of nurses. Methods: The subjects of the study were 64 nurses working in a university hospital. Nurse's CPCR performance have been measured four times (pre-test, post-test at immediately, 3 months and 6 months after intervention). Data were collected from February to August 2013. Results: There were significant differences in knowledge, attitude, self-efficacy, and performance between groups by measure time. And there were significant interactions in knowledge, self-efficacy, and performance between groups, within groups, except for the attitude. The video programs of CPCR interventions appear to be effective in the improvement of knowledge, self-efficacy, and performance, as compared to the control group. Conclusion: The video programs of CPCR education was an effective intervention to improve and retain the level of knowledge, attitude, self-efficacy and performance. And the video program of CPCR education have an advantage of self-learning effect for nurses with shift work. Therefore video programs of CPCR education will be utilized for continuing nurse's education.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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• pp.281-284
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• 2006

ASCE-ACI Committee 426 and 445, on Shear and Torsion, well noted in their report that recent research work regarding shear and torsion had been devoted primarily to members. But it was not logical approach of PSC members applied by axial force based on the shear deformation in web element. And it was not included that the effect of axial is to shift the shear strain(or crack width) in the web element versus the applied shear curve up or down by the amount by which the biaxial tension-compression state varies. The shear strength also increases or decreases, so that the change in shear strain at service load due to the presence of axial load is to some extent changed. Generally, in corresponding beams the shear strain at service load is less in the beam subject to axial compression and greater in the beam subject to axial tension, than in the beam without axial load. In particular, however, no research were available on the shear deformation in shear of PSC members with web reinforcement, subject to axial force in addition to shear and bending. Therefore, this study was basically performed to develop the program for the calculation of the shear deformation based on the shear effect of axial force in prestressed concrete members.

• 한국산학기술학회논문지
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• 제17권1호
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• pp.209-218
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• 2016

본 연구는 일 대학병원 임상간호사의 건강관리 경험의 본질을 이해하기 위해 2015년 10월 4일부터 10월 30일까지 S시에 소재한 일 대학병원 간호사 9명의 참여로 그들의 경험의 의미와 실체를 파악하기 위하여 Colaizzi(1978)가 제시한 현상학적 연구 방법을 적용하여 자료를 분석하였다. 연구 결과로는 참여자의 건강관리 경험이 '신체건강관리에 대한 양가감정', '신체운동에 대한 부담감', '교대근무로 인한 어려움', '스트레스 관리' '자신의 재발견'의 5개의 범주와 이들 범주에 포함된 14개 주제모음 및 42개 주제로 확인할 수 있었다.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제1권3호
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• pp.119-124
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• 2012

스마트 유틸리티 네트워크는 기존의 AMR, 스마트 그리드, 스마트 워터 그리드 등의 다양한 에너지 관련 서비스를 통합할 수 있는 에너지망 인프라로서 기존 사용자 중심의 통신망으로부터 기기 중심의 통신망으로의 새로운 패러다임 전환을 가능케 하고 있다. 이러한 스마트 유틸리티 네트워크는 관련 응용분야의 제약 조건과 요구사항에 있어 센서 네트워크와 많은 유사성을 가진다. 그리하여, 스마트 유틸리티 네트워크를 위한 새로운 네트워크 프로토콜을 개발하기 위해서는 기존의 관련 연구에 대한 철저한 분석이 선행되어야 한다. 따라서 본 논문에서는 스마트 유틸리티 네트워크의 서비스 요구사항과 설계 고려사항을 분석하고 기존의 저 전력 프로토콜과 데이터 수집기법 그리고 In-network 저장기법에 대한 분석을 통해 스마트 유틸리티 네트워크를 위한 새로운 네트워크 프로토콜의 설계 가이드라인을 제시한다.

• International Journal of Automotive Technology
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• 제7권3호
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• pp.345-351
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• 2006

Software-In-the-Loop Simulation(SILS) and Rapid Control Prototyping(RCP) are proposed as an integrated development environment to support the development process from system design to implementation. SILS is an environment used to simulate control systems with temporal behavior. RCP offers seamless phase shift from design to implementation based on automatic code generation. There are several toolsets that support control system design and analysis. A few of these tools generate the control software automatically. However, most of these design toolsets do not cover temporal behavior which appears after implementation. In earlier toolsets, the design and the implementation of a control system are considered as two separate processes which mean the conventional development process is not connected strictly. SILS/RCP environments work under an identical platform and use the same representation for system modeling. An integrated SILS/RCP environment makes it possible to design controllers under conditions similar to real execution during off-line simulation and to realize controllers in the early design phase. SILS/RCP environments integrate the design and implementation phases which reduce the time-to-market and provide greater performance-assured design. The establishment of SILS/RCP and the practical design approaches are presented.

• Safety and Health at Work
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• 제8권4호
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• pp.402-406
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• 2017

Transit workers constitute a blue-collar occupational group that have elevated smoking rates relative to other sectors of employed adults in the United States. This study analyzed cross-sectional tobacco survey data from 935 workers (60% African American; 37% female) employed at an urban public transit agency in California. Prevalence of current and former smoking was 20.3% and 20.6%, respectively. Younger workers were less likely than older workers to be current or former smokers. Having a complete home smoking ban was associated with decreased likelihood of being a smoker [odds ratio (OR) = 0.04, 95% confidence interval (CI) = 0.01-0.17], as were neutral views about whether it is easy for a smoker to take a smoking break during their shift (OR = 0.50, 95% CI 0.28-0.88). Current smoking among the sample is > 50% higher than the adult statewide prevalence. Potential points of intervention identified in this study include perceived ease of worksite smoking breaks and establishing home smoking bans. Tailored cessation efforts focusing on older transit workers more likely to smoke are needed to reduce tobacco-related disparities in this workforce.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2009년도 제38회 동계학술대회 초록집
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• pp.339-339
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• 2010

The metallic nanoparticles (Pt, Au, Ag. Cu, etc.) supported on ceria-titania mixed oxide exhibit a high catalytic activity for the water gas shift reaction ($H_2O\;+\;CO\;{\leftrightarrow}\;H_2\;+\;CO_2$) and the CO oxidation ($O_2\;+\;2CO\;{\leftrightarrow}\;2CO_2$). It has been speculated that the high catalytic activity is related to the easy exchange of the oxidation states of ceria ($Ce^{3+}$ and $Ce^{4+}$) on titania, but very little is known about the ceria titanium interaction, the growth mode of metal on ceria titania complex, and the reaction mechanism. In this work, the growth of $CeO_x$ and Au/$CeO_x$ on rutile $TiO_2$(110) have been investigated by Scanning Tunneling Microscopy (STM), Photoelectron Spectroscopy (PES), and DFT calculation. In the $CeO_x/TiO_2$(110) systems, the titania substrate imposes on the ceria nanoparticles non-typical coordination modes, favoring a $Ce^{3+}$ oxidation state and enhancing their chemical activity. The deposition of metal on a $CeO_x/TiO_2$(110) substrate generates much smaller nanoparticles with an extremely high activity. We proposed a mechanism that there is a strong coupling of the chemical properties of the admetal and the mixed-metal oxide: The adsorption and dissociation of water probably take place on the oxide, CO adsorbs on the admetal nanoparticles, and all subsequent reaction steps occur at the oxide-admetal interface.