• 한국응급구조학회지
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• 제8권1호
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• pp.5-17
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• 2004

A descriptive-correlational study was conducted to examine the job satisfaction and organizational commitment of emergency medical technicians(EMTs) and to identify the relationship between job satisfaction and organizational commitment. Subjects of this study werw 85 EMTs who passed first grade qualification examination and work at hospitals or fire stations in Gwangju and Chonnam province. Data were collected using a structured questionnaire by a postal survey from Sept. 10 to Oct. 20, 2003. For data analysis, descriptive statistics, ANOVA. t-test, and Pearson Correlation were used. The mean score of subjects' job satisfaction was 3.04 and the mean score of organizational commitment was 3.33. There was no significant differences on job satisfaction and organizational commitment by general characteristics of subjects. Job satisfaction was significantly differed by their careers as a EMT, current working place, and types of duty. Organizational commitment was significantly differed by their current working place, types of duty, and level of mean allowance. There was statistically significant positive correlation between job satisfaction and organizational commitment. These findings provide implications to improve job satisfaction and organizational commitment for EMTs. Further studies are recommended.

• 한국태양에너지학회 논문집
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• 제27권2호
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• pp.61-69
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• 2007

The final energy consumption in the building sector in Korea represents almost 20% of the total energy consumption. Besides, Space heating and hot water generation in Korea are based on fossil fuels, with a serious environmental impact. Despite the popularity of simple solar domestic hot water systems, active solar space heating remains, for various reasons, marginal. And thus, the aim of this paper is to demonstrate potentialities of solar assisted space heating systems, both technically and economically. From this study found that the solar heating system with CPC solar collectors integrated the roof of a single-story residential building shares $50{\sim}55%$ of the annual heating load.

• 설비공학논문집
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• 제17권2호
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• pp.173-182
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• 2005

The Performance of U-tube ground heat exchanger for geothermal heat Pump systems depends on the thermal properties of the soil, as well as grout or backfill materials in the borehole. In-situ tests provide a means of estimating some of these properties. In this study, in-situ thermal response tests were completed on two vertical boreholes, 130 m deep with 62 mm diameter high density polyethylene U-tubes. The tests were conducted by adding a monitored amount of heat to water over a $17\~18$ hour period for each vertical boreholes. By monitoring the water temperatures entering and exiting the loop and heat load, overall thermal conductivity values of grout/soil formation were determined. Two parameter estimation models for evaluation of thermal response test data were compared when applied on the same temperature response data. One model is based on line-source theory and the other is a numerical one-dimensional finite difference model. The average thermal conductivity deviation between measured data and these models is of the magnitude $1\%$ to $5\%$.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.42-47
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• 2008

This paper reports the system performance of a hybrid plant, which combines a renewable energy plant of GSHP(Ground Source Heat Pump) with a conventional plant (screw water chiller). To find out operational cost and operating characteristics, the performance of the hybrid system was measured in a building located in Jeju island. Based on the measured data, the operating characteristics were analyzed and the operational cost was estimated by using payment table, which was provided by the Korea Electric Power Cooperation. Operating methods to save energy were recommended.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 동계학술발표대회 논문집
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• pp.493-498
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• 2008

Particles or deposit formed by corrosion of the pipe material bring about bad influences on the heating systems with inconvenience, energy loss and so on. In order to obtain the non-corrosive environments, the circulation hot water should properly be treated in several ways to satisfy one or more conditions of the followings: suitable pH-level, low hardness, low oxygen content, low conductivity, low level of chlorides and sulphur compounds and low level of solid particles. This experimental study was carried out to develope the new guidelines on the optimal water quality and directions for water quality management in heating systems. As results, it was recommended that the heating water be maintained pH-level not less than 8, hardness contents as $CaCO_3$ no more than 50 mg/L, turbidity no more than 10 NTU and T-Fe contents 1 mg/L below.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2007년도 동계학술발표대회 논문집
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• pp.352-357
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• 2007

The objective of this study is to find the optimal set-point of a hybrid Plant, which is combined by renewable energy plant of the GSHP(Ground Source Heat Pump) and the conventional plant(chiller, boiler). The work presented in this study was carried out by using the EnergyPlus(Version 2.0). In order to validate the simulation model, field data were measured from a building. The GSHP was used as a base plant and the conventional plant as the assistant plant. Various temperatures were controlled (zone summer set-point, zone winter set-point, chilled water temperature, hot water temperature) to find the optimal set-point temperature of the system. The influence of the various set-points were analyzed seasonally.

• 설비공학논문집
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• 제18권3호
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• pp.279-286
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• 2006

The present study concerns the annual performance evaluation of a hybrid-renewable energy system with geothermal and solar heat sources for hot water, heating and cooling of the residential buildings. The hybrid energy system consists of ground source heat pump of 2 RT for cooling, solar collectors of $4.8m^2$, storage tank of 250 liters and gas fired backup boiler of 11.6 kW. The averaged coefficients of performance of geothermal heat pump system during cooling and heating seasons are measured as 4.1 and 3.5, respectively. Also solar fraction for hot water is measured as 35 percent. Overall, the results shows that the hybrid-renewable energy system satisfactorily operated under all climatic conditions.

• 한국응급구조학회지
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• 제18권3호
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• pp.19-35
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• 2014

Purpose: This study aimed to improve the quality of prehospital emergency care for elderly patients by determining current prehospital care status based on run sheets and level of knowledge, and prehospital care confidence toward the elderly through questionnaires answered by 119 emergency medical technicians (EMTs). Methods: This study was conducted with 4,946 elderly patients who were transferred to the hospital by 119 ambulances in D city from March 1, 2013 to February 28, 2014. This study was a descriptive study of 119 run sheets. The questionnaire was completed by 160 EMTs working in D city. All data were analyzed by using SPSS 21.0. Results: 74.2% was due to disease among the 4,946 elderly patients who were transferred by 119 ambulances, and a rest was due to injury. The mean knowledge score of the 119 EMTs regarding elderly patients was low. Their confidence on prehospital care of the elderly patients statistically significantly differed according to career at hospital and education. Conclusion: Theoretical knowledge, education on prehospital care of the elderly, and repeated technical prehospital care education and training accompanied by feedback assessment by 119 EMTs are needed.

• 한국화재소방학회논문지
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• 제24권1호
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• pp.64-71
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• 2010

이 연구를 위해 2009년 1월1일부터 2009년 2월 8일 까지 일개 종합병원에 119구급대로 내원한 모든 환자의 구급활동일지 255부를 조사하였다. 구급활동일지의 전체 기재율 62.1%, 가장 높은 항목은 환자 인수자에 대한 기록으로 100.0%, 가장 낮은 항목은 의사지도에 관한 항목으로 0.4%로 나타나 기대치에 미치지 못한 것으로 조사되었다. 효율적인 응급의료 정보전달매체로서의 119구급활동일지의 기재율을 높이기 위해서는 전문 인력의 확충과 의료진의 적극적인 관심 및 피드백, 구급활동일지의 항목 배열의 규칙성, 기록의 중요성에 대한 지속적인 교육이 필요할 것으로 사료된다.

• 한국응급구조학회지
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• 제19권3호
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• pp.69-85
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• 2015

Purpose: This study aimed to investigate the prevalence of musculoskeletal symptoms (MSSs) and their correlation with subjective health condition (SHC) among emergency medical technicians (EMTs). Methods: A self-reported questionnaire was disseminated to EMTs (N=257) at emergency medical institutions and fire stations. Results: The prevalence of MSSs was very high in the studied EMTs: 88.3% reported having MSSs. The most commonly affected site was the lower back (73.9%) followed by the neck (56.8%) and the shoulder (55.6%). MSSs were more common in women than in men, and its frequency increased with age. MSSs in the neck and shoulder were more increased in EMTs with < 1 year of service. MSSs in the hand / wrist / finger or leg / foot were significantly increased in EMTs of emergency medical institutions than those of fire stations. Job satisfaction was significantly lower in those with MSSs of the lower back. The subjective heath condition was decreased with age, marriage, or smoking. There was significant corelation between MSSs and SHC. Conclusion: This study suggests that MSSs are a reasonably common problem for EMTs, and that solutions need to be imposed such as some actual tasks or items related to work postures, work control, and work organization.