• 한국태양에너지학회 논문집
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• 제39권3호
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• pp.19-27
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• 2019

In commercial areas, outdoor units are typically installed close to one another in the narrow space between buildings due to insufficient regulations. This makes it difficult to ventilate the discharge airflow, which may lead to deterioration of the performance of outdoor units. This study conducted CFD simulation to analyze the thermal environment according to the installation distance of the outdoor unit. The outdoor unit was installed in the space between buildings, and the thermal environment was analyzed by changing installation distance and wind speed. The performance of the outdoor unit was evaluated by measuring the on-coil temperature. The results show that the closer the distance between outdoor units, the higher the condenser on-coil temperature. Also, the on-coil temperature appeared to rise dramatically at lower wind speed.

• 한국환경생태학회지
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• 제22권4호
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• pp.443-452
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• 2008

경상북도 낙동강 상류부의 삼림 및 관목식물군락에 대해 식물사회학적 조사를 하였다. 그 결과 3군강에 속하는 10군락단위와 상급단위 미결정 4군락단위를 식별하였다: A-1 단풍나무-너도밤나무군강군, 물푸레나무-느릅나무군목, 미정의 군단: 1) 들메나무군락: 느티나무군목(가칭), 느티나무군단(가칭): 2) 느티나무군락, A-2 나도버들군강, 버드나무군목, 버드나무군단: 3)버드나무-왕버들군집, 4) 버드나무군집, 5) 시무나무군집, 6) 갯버들군집, 7) 눈갯버들군집, 8) 선버들군집, A-3 찔레꽃군강, 마-칡군목, 쥐다래-왕머루군단: 9)국수나무군락, 10)구기자나무군락, A-4 상급단위 미결정의 군락: 11) 누리장나무군락, 12) 가죽나무군락, 13) 아까시나무군락, 14) 족제비싸리군락. 본 연구에서 식별된 군락단위는 cluster분석의 결과와 아주 잘 일치하였다. 다변량 분석에 있어서 주성분분석의 결과는 이보다 덜 일치하였으나 인위적 영향에 따라 집합의 정도를 나타내는 것으로 해석되었다. 이들 삼림 및 관목의 식생단위는 일본의 것과 공통성이 높은 초본군락과는 달리, 군집레벨에서 한국에 고유한 다섯 개의 식생단위를 포함하였다. 이상의 군락생태학적 연구를 바탕으로 각 군락과 환경과의 관계, 자연보호 등에 관해 논하였다.

• 가정간호학회지
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• 제27권3호
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• pp.250-258
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• 2020

Purpose: This study aimed to investigate the relationship between nursing work environment, patient safety culture, and patient safety nursing activities in hemodialysis units at primary care centers. Methods: In this cross-sectional descriptive study, 116 nurses working in hemodialysis units at 22 primary care centers were enrolled as participants. They were selected them by the convenience sampling method. Data were collected using structured questionnaires that included questions on general characteristics, nursing work environment, patient safety culture, and patient safety nursing activities. Results: The nursing work environment was relatively good; however, the patient safety culture and patient safety nursing activities were poor. A positive correlation was found between nursing work environment, patient safety culture, and patient safety nursing activities. Factors that affect patient safety culture were rated high in the order of nursing work environment and patient safety nursing activities, and factors affecting patient safety nursing activities were rated high in the order of patient safety culture and age. Conclusion: This study showed that the development of tailored patient safety training for nurses in hemodialysis units working in primary care and administrative support from those institutions are needed. In particular, strategies accounting for nurses' characteristics such as age are required to strengthen patient safety nursing activities.

• 설비공학논문집
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• 제17권8호
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• pp.704-713
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• 2005

The purpose of this study is to suggest the concept of an integrated unit and to develop integrated units considering the layout of luminaires and diffusers in workspace. An integrated unit can be defined as a planning unit which satisfies the environment comfort criteria of workspace. Integrating process of each unit was proposed by considering the current workspace planning process. Luminaire and diffuser types are classified by surveying the workspace of the domestic and foreign office buildings. Several lighting units and air-conditioning units were developed by visual and thermal simulation, and integrated units for various architectural module which satisfies the visual and thermal comfort criteria were drawn from those units.

• Advances in environmental research
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• 제9권4호
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• pp.233-249
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• 2020

To date, there is no central wastewater (WW) treatment plant in Erbil city, Kurdistan region, Iraq. Therefore, raw WW disposes to the environment and sometimes it used directly for irrigation in some areas of Erbil city. Disposal of the untreated WW to the natural environment and using for irrigation it causes problems for the people and the environment. The aims of the current work were to study the characteristics, design of primary and different secondary treatment units and reusing of produced WW. Raw WW samples from Ashty city-Erbil city were collected and analyzed for twenty three quality parameters such as Total Suspended Solids (TSS), total dissolved solids, total volatile and non-volatile solids, total acidity, total alkalinity, total hardness, five-day Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), biodegradability ratio (BOD5/COD), turbidity, etc. Results revealed that some parameters such as BOD5 and TSS were exceeded the standards for disposal of WW. Design and calculations for primary and secondary treatment (biological treatment) processes were presented. Primary treatment units such as screening, grit chamber, and flow equalization tank were designed and detailed calculation were illustrated. While, Conventional Activated Sludge (CAS), Sequencing Batch Reactor (SBR) and Moving Bed Biofilm Reactors (MBBR) were applied for the biological treatment of WW. Results revealed that MBBR was the best and economic technique for the biological treatment of WW. Treated WW is suitable for reusing and there is no restriction on use for irrigation of green areas inside Ashty city campus.

• KIEAE Journal
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• 제10권4호
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• pp.81-86
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• 2010

The main sources of the new house syndrome(sometimes it called sick building syndrome) are a concentration of formaldehyde (HCHO) and a concentration of total volatile organic compounds(TVOC). I had field measurements of indoor air quality in the apartment unit at medium-size cities(Y city, C city). I measured indoor air temperature, HCHO concentration in 16 units, TVOC concentration in 6 units and air tightness in 7 units. And I measured outdoor air quality, HCHO concentration and TVOC concentration. Mean concentration of HCHO was $357{\mu}g/m^3$(2006 standard=$120{\mu}g/m^3$), mean concentration of TVOC was $3,092{\mu}g/m^3$ and mean effective air leakage area was 193 cm2. There was a close relation between the indoor air temperature and HCHO concentration, between the indoor air temperature and TVOC concentration. Air tightness also had relation.

• 간호행정학회지
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• 제18권4호
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• pp.414-423
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• 2012

Purpose: The purpose of this study was to investigate the impact of the unit-level nurse practice environment on nurse turnover intention in the small and medium sized hospitals. Methods: A cross-sectional study was conducted using a questionnaire survey with 308 nurses in 38 nursing units of 6 small and medium sized hospitals, having over 200 beds and under 300 beds and located in B metropolitan city. Data were collected from July 20 to August 10, 2011. Data were analyzed using hierarchical multiple regression. Results: The mean turnover intention in nurses of small and medium sized hospitals was $3.52{\pm}0.53$. Factors affecting turnover intention in the nurses included age, work unit, monthly income, number of night-duties, work hours per day and unit-level nurse practice environment. The unit-level nurse practice environment accounted for 15% of turnover intention when other variables were controlled. Conclusion: The results of the study indicate that nurse turnover intention is associated with the nurse practice environment at the unit level. Small and medium sized hospitals can improve nurse retention and lower turnover intention by changing the nurse practice environment of unit, such as creating better support services and nurse participation in hospital affairs.

• 한국컴퓨터그래픽스학회논문지
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• 제16권3호
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• pp.11-19
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• 2010

본 논문에서는 가상환경에서 실세계 물체들의 사실적 시뮬레이션과 표현에 필요한 물체의 물리적 속성 정의를 위해서 물리 단위를 도입하는 방법을 설명한다. 표준화된 물리 단위 규격의 정의를 위하여 물리 단위는 SI 단위계(International System of Units)를 기본으로 하고 가상세계 데이터의 표준화된 규격을 위하여 웹3D 표준인 X3D(Extensible 3D)를 기반으로 하여 물리 단위 명세를 정의한다. 물리 단위를 X3D 규격 안에서 정의하는 과정에서 물리 단위의 적용을 받은 물체가 X3D 장면 안에서 사실적인 변화로 표현되기 위해서는 X3D 전체 스키마에 합당하게 정의되어야 한다. 실세계 물리 단위를 X3D 스키마에 확장하여 정의하고, 확장된 X3D 규격으로 구현된 브라우저에서 물리 단위를 포함하는 물체가 물리 단위 개념이 없었던 기존 X3D 물체가 어떻게 다른가를 물리 단위 예제를 이용하여 비교 분석한다.

• 한국환경과학회지
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• 제11권7호
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• pp.611-620
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• 2002

The purpose of this study was to analyze the elementary school teachers＇perception toward the environment-related subjects in science education and to investigate their instructional methods in delivering the subjects in the classroom. The participants of this study were 300 elementary school teachers sampled from elementary schools in Kyung Nam Province. The findings of this study were as follows; First, more than half of the teachers surveyed showed that the environment-related units and contents in the science textbook were insufficient to the existing issues. Second, the large portion of teachers responded that the teaching materials in the textbook were insufficient to deliver the contents. Third, the largest portion of respondents replied that their preferred instructional method was a teacher-directed instruction followed by a case study approach. Fourth, in terms of the effectiveness of environmental education, both male and female teachers showed negative responses. Furthermore, male teachers were more negative than female teachers. Fifth, total means of their preference of the environment-related units was 3.13. The unit for sixth graders titled｀Environmental Pollution and Protecting Nature＇showed the highest preference, whereas the unit for fifth graders titled｀Structure and Functions of Plants＇showed the lowest preference. Sixth, there was no statistically significance in gender and their working areas. Seventh, there was statistically significant differences between male and female teachers in terms of teaching experience. In detail, the teachers with 5 to 9 teaching experience showed the lowest scores, while the teacher with more than 15 years teaching experience showed the highest scores in their perception of the units. Eighth, there was a significant difference between two groups in terms of their educational background. For example, two-year college graduates showed higher preference than four-year college graduates.

• Child Health Nursing Research
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• 제25권4호
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• pp.377-387
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• 2019

Purpose: The purpose of this study was to examine the correlation between a flexible parental visiting environment and parental stress in neonatal intensive care units (NICUs). Methods: The study participants included 60 parents of premature infants in NICUs. Structured questionnaires and interviews, as well as observations by researchers using a caregiving behavior checklist, were used to measure the flexibility of the parental visiting environment and parents' stress levels. Quantitative and qualitative data were collected concurrently and were initially analyzed as separate data sets. Data collection extended from March 11, 2018 to June 30. 2018 and the data were analyzed using descriptive statistics, the independent t-test, one-way analysis of variance, and Pearson correlation coefficients. Results: There was a negative correlation (r=-.30, p=.021) between parental stress and the total number of visits in 7 days. We also found that the average duration of each visit and the number of caregiving behaviors performed by parents were positively correlated (r=.73, p<.001). Conclusion: When designing a flexible visiting environment for parents, parents should be encouraged to visit their babies. By doing so, stress can be reduced both for babies and for parents. Therefore, it is suggested that the related polices and regulations in South Korea should be changed to provide more a flexible visiting environment to promote better parent-child attachment and family adjustment.