• 설비공학논문집
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• 제12권7호
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• pp.659-666
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• 2000

Heat transfer characteristics of a heat exchanger for low temperature waste heat recovery using oscillating capillary tube heat pipe were evaluated against the charge ratio variation of working fluid and various working fluids. R-l42b, R-22 and R-290 were used as working fluids. The heat exchanger was composed of heat pipe with capillary tube bundles, having a 2.6mm in outer diameter, 1.4mm in inner diameter with 101m long, and 40 turns. Charge ratio of working fluid was 40% and 50%. Water was used as secondary fluid. Inlet temperature and mass velocity for each secondary fluid were 297 K, 280 K and9~27 kg /$m^2s$,, respectively. From experimental results, it was found that heat transfer performance of R-22 was higher than those of R-l42b and R-290 and it was proportional to Figure of merit for thermosyphons. As a result, it was thought that R-22 was the most suitable working fluid of waste heat recovery for low temperature waste heat recovery.

• Journal of Advanced Marine Engineering and Technology
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• 제22권6호
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• pp.792-799
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• 1998

Further improvement of existing $H_{2}O/LiBr$ absorption refrigeration machine is absolutely neces-sary to promote the utilization of gas-cooling system Among various methods to improve the per-formance of the absorption refrigeration machine this research has focused on the use of a new working fluid that has better properties than the existing $H_{2}O/LiBr$ working fluid. In the series of the research, $H_{2}O/LiBr+HO{(CH_{2})}_{3}OH$ system was selected as the most promisable candidate. The absorption refrigeration machine is water-cooled double-effect, $H_{2}O/LiBr+HO{(CH_{2})}_{3}OH$ sys-tem with series flow type. In this study we found out the characteristic of new working solution through the cycle simulation and compared the result with that of LiBr solution to evaluate. Theoptimum designs and operating conditions were determined based on the operating constraints and the coefficient of performance. Results demonstrate that new working fluid subsrantially increases COP by as much as 10% and has a wider working range with 8% higher crystallization limits compared to the conventional $H_{2}O/LiBr$.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제30권2호
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• pp.66-73
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• 2019

Objectives: This study aimed to investigate the trajectory of change of diverse attention and working memory in Koreans from 4 to 40 years of age. Methods: The data of 912 subjects from 4 to 15 years of age obtained from a previous standardization study of the computerized comprehensive attention test were merged with the newly obtained data of 150 subjects aged 16 to 40 years from this study. We evaluated the various kinds of attention, in which each subtest had five indicators. Working memory, with parameters such as number of correct responses and span, was also measured. Results: Our findings indicated that attention developed as age increased, and it decreased or was maintained after a certain age. Selective and sustained attention developed rapidly in children and adolescents, until mid-teens or 20 s when it ceased development. Divided attention, however, developed up to approximately age 20. In addition, working memory developed until mid-teens or 20 s. Conclusion: We presented the standardized data on diverse kinds of attention and working memory in children, adolescents, and adults in Korea. We could recognize any patterns of change in attention and working memory with increasing age.

• The Journal of Asian Finance, Economics and Business
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• 제8권7호
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• pp.275-283
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• 2021

Globalization has greatly contributed to an increased need for improvement of human capital, and particularly in the development of the real estate and construction sector. Since the political and economic reforms in 1986, Vietnam has experienced a strong economic performance. The real estate and construction sector is one of the fastest growing industries in Vietnam, accounting for approximately 7.6% of GDP in Vietnam. The aim of this study is to identify critical factors influencing the satisfaction of employees to their working place. The sample data collected was from 265 employees, managers and staff in real estate and construction companies in Vietnam. After revising the missing data, and the errors, 240 valid respondents are selected. In addition, the analysis also employs SPSS software by discussing descriptive statistics, Cronbach's alpha test, exploratory factor analysis (EFA), and regression analysis. Our empirical findings show that a company offering greater wages can positively affect the satisfaction of employees to their working place in the real estate and construction sector. In addition, a firm with a superior working relationship and working environment has a positive and statistically significant impact on the satisfaction of employees to their working place.

• 대한공업교육학회지
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• 제42권2호
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• pp.1-19
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• 2017

이 연구의 목적은 중등단계 공업계열 직업계고 교사의 직무 수행 시간 현황과 적정 직무 수행 시간을 분석하는 것이다. 아울러 중등단계 공업계열 직업계고 전문교과 교사와 보통교과 교사의 직무 수행 시간 현황 및 적정 직무 수행 시간을 함께 분석하고자 한다. 중등단계 공업계열 직업계고 교사의 직무 수행 시간을 분석하기 위하여, 중등단계 직업계고 교사 대상으로 구명된 직무를 바탕으로 조사 도구를 개발하였으며, 조사 도구는 설문지를 사용하였다. 본 연구의 결과는 다음과 같다. 첫째, 중등단계 공업계열 직업계고 교사가 인식하는 직무 수행 전체 시간은 2,787.8분이고, 적정 직무 수행 전체 시간은 2,934.7분이며, 직무 수행 시간과 적정 직무 수행 시간 간의 차이는 146.9분으로 나타났다. 직무 영역별 직무 수행 시간은 수업 운영, 교과외 학생지도, 교무 행정 업무, 수업 준비 및 계획 영역 등의 순으로 많게 나타났고, 적정 직무 수행 시간은 수업 운영, 수업 준비 및 계획, 교과외 학생지도, 교무 행정 업무 영역 등의 순으로 많게 나타났다. 직무 수행 시간에 비해서 적정 직무 수행 시간이 적은 직무 영역은 수업 운영, 교과외 학생지도, 교무 행정 업무영역이고, 이외 직무 영역에서는 직무 수행 시간이 더 필요한 것으로 나타났다. 둘째, 중등단계 공업계열 직업계고 교사의 교과(전문교과/보통교과)별 직무 수행시간은 전문교과 교사 2,888.3분, 보통교과 교사 2,536.1분으로 나타났고, 적정 직무수행 시간은 전문교과 교사 3,021.8분, 보통교과 교사 2,716.8분으로 나타났다. 중등단계 직업계고 교사가 인식하는 직무 수행 시간과 적정 직무 수행 시간 간의 차이는 전문교과 교사 133.5분, 보통교과 교사 180.7분으로 나타났다.

• 한국방사선학회논문지
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• 제12권6호
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• pp.727-735
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• 2018

본 연구는 경남지역에 근무하는 방사선사를 대상으로 병원감염관리에 대한 특성과 인지도 및 수행도를 분석하여 병원근무 시 감염관리에 대한 올바른 인식과 수행 능력을 향상하고, 병원감염관리의 개선 및 방사선사의 감염관리 교육을 위한 기초자료를 얻고자 실시하였다. 연구에 사용한 도구는 설문지로 2018년 04월01일부터 04월30일까지 경남에 소재하는 의료기관에 근무하는 방사선사를 대상으로 설문지 총400부를 배부하여 연구에 적합한 320부를 SPSS 18.0 통계 프로그램을 이용하여 분석하였다. 병원감염관리에 대한 요인으로는 병원감염에 관한 특성 5문항과 병원감염관리에 대한 인지도와 수행도로 손위생관리, 개인위생 및 의복관리, 의료기구 및 소모품관리, 청소 및 폐기물관리, 검사실 및 환경관리 등, 총60문항으로 분석하였다. 인구사회학적특성으로 성별, 결혼, 연령, 학력, 근무기관, 근무경력, 근무부서를 기준으로 기술통계, t-test, ANOVA, 상관관계 및 회귀분석을 하였다. 병원감염관리에 대한 인지도는 $4.19{\pm}.60$점으로 높게 나타났으며, 수행도에서도 $4.22{\pm}.52$점으로 높게 나타나 병원감염관리에 대한 인지도와 수행도에서 경남지역 방사선사들의 병원감염관리 수준은 높은 것으로 분석되었다. 병원감염관리에 대한 방사선사의 인지도 및 수행도는 유의한 상관관계가 있는 것으로 나타났으며, 인지요인이 수행도에 미치는 영향에 대한 다중회귀분석에서는 66.1%의 설명력과 함께 유의한 양의 영향력을 미치고 있음을 알 수 있었다. 의료기관 다양한 부서에서 근무하는 방사선사의 병원감염관리에 대한 인식을 높이기 위해서는 지속적인 감염관리교육과 더불어 병원업무 환경개선을 통한 수행능력을 향상시켜야 하며, 병원감염관리 및 예방교육에 적극적으로 참여하여 병원감염관리 업무에 대한 전문성 확보와 함께 중추적인 역할을 수행하여야 할 것으로 판단된다.

• 산경연구논집
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• 제11권10호
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• pp.27-38
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• 2020

Purpose: The public sectors including government and public organizations have put an efforts to improve the quality of people's lives by providing enhanced services. The purpose of this paper is to investigate the factors that affect job attitude, job satisfaction, and job performance in the public sector, that are rarely examined by previous studies. Research Design, data, and methodology: The following research questions have been proposed: i) how do payroll system, personnel management system, cooperative working environment, and self-efficacy affect job attitude?; and ii) how does job attitude affect job satisfaction and performance? This paper used a survey through an online platform and collected data randomly from five classified public institutions. This study applied regression analysis and ANOVA. Results: This study found that cooperative working environment and self-efficacy had significant impacts on job attitude, while payroll system and personnel management system did not affect job attitude. Overall job attitude affected both job satisfaction and performance. Conclusions: The results provide policy implications to the public sector which factors should be considered to improve job attitude, job satisfaction, and job performance. The results also provide managerial implications how such efforts ultimately improve service quality to the citizens.

• 한국직업건강간호학회지
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• 제10권1호
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• pp.5-23
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• 2001

The purpose of this study was to analyse the level of recognition and performance of clinical nurses about the prevention of nosocomial infection. Subjects of the study were 425 nurses working at two university hospitals. Self report questionnaires were used to measure the level of recognition and performance about the prevention of nosocomial infection. These instruments had five dimensions of the management of nosocomial infection : hand washing, fluid therapy, foley catheterization, respiratory tract, and aseptic articles. Reliability coefficients of these instruments were found Cronbach's ${\alpha}=.94-.95$. Data were collected from August 1 to August 15, 2000. The results of the study were as follows : 1) The mean score of the recognition scores about the management of nosocomial infection was 3.89. 2) The mean score of the performance about the management of nosocomial infection was 3.42. 3) The mean score of the recognition about the management of nosocomial infection was significantly higher than the performance score(t=25.72. p<.001). 4) There was significant difference in the score of the recognition about managment in nosocomial infection according to nurses working unit(p<.001).

• 한국전자통신학회논문지
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• 제8권11호
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• pp.1771-1776
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• 2013

본 연구는 대학교 태권도 선수들을 대상으로 정적 스트레칭과 PNF 스트레칭이 선수들의 유연성 향상과 순발력에 미치는 영향을 알아보기 위하여 슬관절의 관절가동범위를 평가하고, 점프수행능력을 평가하여 기능적 수행능력에 미치는 영향을 알아보고자 하였다. 그 결과 정적 스트레칭과 PNF 스트레칭 그룹 모두 관절가동범위와 점프수행능력에 유의한 향상을 보였고, 두 그룹간의 비교에서는 점프수행능력에서만 유의한 차이를 보였다.

• The Journal of Asian Finance, Economics and Business
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• 제9권9호
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• pp.115-120
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• 2022

This research aims to investigate the antecedents of career growth and its impact on employee performance. The research design is quantitative with a causal method. The sample used is 242 respondents working in different hospitals in Banten Province and were selected through the snowball sampling technique. The analytical method used to examine the research model is PLS-SEM. The analysis result shows that work environment and training have an impact on increasing career development and hospital employee performance. Career development can also directly be an antecedent in improving the performance of hospital employees, but only has a moderate effect in mediating the influence of work environment and training on the employees' performance in the hospital. Based on these findings, hospital management in Banten Province must create and maintain a comfortable working environment for employees, offer training specific to each employee's line of work to help them improve their abilities, and create a system for career planning that takes into account each employee's potential.