• 한국지열·수열에너지학회논문집
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• 제11권4호
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• pp.7-13
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• 2015

The efficiency, reliability and performance of any heat pump unit can only be ascertained after it has been tested and rated. For this reason, specific facilities, equiped with testing plants are built. Heat pump calorimeter is the facilities used by most of these testing facilities in their rating and certification process. The ultimate function of calorimeters is to, control and maintain the constant standard test conditions (indoor/outdoor entering temperatures and flow rate etc) during testing period. In this study, the test standards of heat pump unit and the structure of the calorimeter are surveyed. In addition, this study analyzes the total energy consumption of a water to water heat pump calorimeter. Heat pump calorimeter consumed much energy to excute the heat pump tests. The energy consumption of the calorimeter was higher than the heat pump unit, and it was increased as the heat pump unit capacity decreased.

• 임상간호연구
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• 제20권2호
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• pp.162-176
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• 2014

Purpose: The purpose of this study was to perform an operating room nursing activities analysis and estimate nursing intensity of each nursing activity based on the Relative Value Scale (RVS). Methods: The methodology for this study of RVS was based on the work of Hsiao et al. The first stage was to identify nursing activities and the second to measure intensity of nursing activities including technical skill, mental effort, and stress. Results: Calculation of the RVS for 99 nursing practices showed a score range from 300.00 to 1337.78. CS operation assistant, OS operation assistant, and obtaining certification had high nursing intensity. Surgical hand washing, putting on surgical gowns, surgical gloves and surgical caps and mask had low nursing intensity. Conclusion: The activities of operating room are not compensated separately but reimbursement is usually included in physician fees. In the future, an estimation of nursing cost should show the nursing contribution rate to total operation revenue.

• 환경영향평가
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• 제14권3호
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• pp.109-115
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• 2005

This study was conducted to evaluate the efficiency of indoor air cleaners and to inform how to select them correctly to the users. The efficiencies of removing suspended bacteria per hour were $64.3{\pm}13.1%$ for filter, wet, and complex type, respectively, which showed the complex type was the most efficient. The removal efficiencies of formaldehyde (HCHO) after two hours operation of air cleaners showed 88.3% and 81.1% for filter and wet type, respectively. The efficiency of complex type, with removal rate of 55.5~58.4%, was decreased after 30 minutes operation. Therefore, it is recommended to perform over 60 minutes when doing air cleaner certification test for HCHO removal efficiency. Generally, air cleaners having low wind volume showed higher efficiency. All tested air cleaners had no potential for removing of volatile organic compounds (VOCs), which is toxic substances, and it is desirable to develop a device which can control these substances. The results also confirmed that there was no ozone production from all tested air cleaners. And it is recommended to ventilate for 20 minutes every four hours to maintain 50% ventilation status.

• Elastomers and Composites
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• 제56권3호
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• pp.124-135
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• 2021

Evaluating service lives of rubber materials at certain temperatures requires a destructive method (typically using elongation at break). In this study, a non-destructive method based on hardness change rate was proposed for evaluating the service life of chloroprene rubber (CR). Compared to the destructive method, this non-destructive method ensures homogeneity of CR specimens and requires a small number of samples. Thermal accelerated degradation test was conducted on the CR specimens at 55, 70, 85, 100, and 125℃, and the tensile strength, elongation at break, and hardness were measured. The results of the experiment were compared to those of the accelerated life evaluation method proposed in this study. Comparing the analyzed lives in the high temperature region (70, 85, 100, and 125℃), the difference between the service lives for the destructive method (using the elongation at break) and non-destructive method (using the hardness) was approximately 0.1 year. Therefore, it was confirmed that the proposed non-destructive evaluation method based on hardness changes can evaluate the actual life of CR under thermally accelerated degradation conditions.

• 한국태양에너지학회 논문집
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• 제39권5호
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• pp.29-40
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• 2019

In response to the rapid climate change, in order to save energy in the field of buildings, the country is planning not only zero energy buildings but also zero energy cities. In the Urban Development Project, the Energy Use Plan Report is prepared and submitted by predicting the amount of energy demand at the planning stage. However, due to the activation of zero-energy buildings and the increase in the supply of new and renewable energy facilities, the energy consumption behavior of buildings in the city is changing from the previous ones. In this study, to estimate urban energy demand of Zero Energy City, building energy demand forecasts based on "Passive plans for use of energy based primary energy consumption", "Actual building energy usage data from Korea Appraisal Board" and "data from Certification of Building Energy Efficiency Rating" as well as demand forecast according to existing "Consultation about Energy Use Plan Code" were calculated and then applied to Multifunctional Administrative City 5-1 zone to compare urban total energy demand forecasts.

• 항공우주산업기술동향
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• 제7권2호
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• pp.106-114
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• 2009

그 동안 항공부품시장은 높은 신뢰성과 안전성을 요구하는 항공산업의 특성로 인해 OEM(Original Equipment Manufacturer) 부품이 주도하여 왔다. 그러나 제조기술의 발전, 경기침체, 유가상승 및 아시아-태평양 신흥 시장의 부각 등의 환경적 변화로 인해, 최근, 항공시장에서의 PMA 부품에 대한 관심이 지속적으로 증대되고 있다. 실제로 2006년 이후 FAA PMA 승인부품은 매년 40,000 개씩 증가하고 있으며, PMA 부품 보급률(아시아-태평양 시장)은 2007년 2.5%에서 2017년 8%까지 증대될 것으로 예상되고 있다. 따라서, 본 논문에서는 항공부품 승인제도에 대한 이해를 도모하고, 새로운 PMA 시장을 살펴보기 위해 FAA PMA/EASA EPA의 절차상 요건과 PMA 부품시장 현황을 소개하였다.

• 한국지열·수열에너지학회논문집
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• 제14권4호
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• pp.35-42
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• 2018

Among the various ground source heat pump systems, vertical-type heat pump systems have been distributed greatly. Most of the vertical-type ground source heat pump systems have been designed based on the Korean Ministry of Knowledge Economy Announcement in Korea. In this study, the design process of the vertical-type ground source heat pump system in the announcement was analyzed, and the effects of the design parameters on the ground loop heat exchanger were investigated. Borehole thermal conductivity was the highest dominant design parameter for ground loop heat exchangers. The borehole thermal conductivity was changed according to the pipe and grout thermal conductivity. For optimal design of the ground heat pump system, it is highly recommended that the design process in the announcement will be revised to adopt the various tubes and grout which have higher thermal conductivity. In addition, the certification standard for heat pump unit should be revised to develop the heat pump with a small flow rate.

• 한국항공우주학회지
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• 제38권10호
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• pp.1026-1030
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• 2010

본 논문에서는 KSLV-II의 로켓엔진에 사용될 BLDC 모터로 구동되는 극저온 추력제어 밸브의 개발 과정 및 결과를 소개하였다. 개발된 추력제어밸브는 90K의 극저온, 113.2bar의 고압 환경에서 액체산소의 유량을 BLDC 모터로 작동되는 밸브 구동기를 통해 조절할 수 있다. 추력제어밸브는 모든 개발 인증시험을 통과하였으므로 향후 일부 하드웨어 수정 후, 엔진 연소시험에 적용이 가능하다.

• KIEAE Journal
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• 제10권1호
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• pp.91-96
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• 2010

Incheon Free Economic Zone's Songdo Area is a newly constructed city built on land reclaimed from the seaside and the surrounding area. Yeongjong Area is made after Land reclamation between Yeongjong Island and Yongyou Island began in November 1992. The first phase linking these islands to create the Incheon International Airport (phase 1) and the Airport Town Square community was finished in March 2001. However, if we take a look at the overall status of the project as it is carried on at present, it is hard to deny that the project is trapped inside the same legal restrictions as are all other existing cities, which permits Songdo Area and Yeongjong Area to meet only very minimum standards. This study intends to analyze and assess the Incheon Free Economic Zone's Songdo Area and Yeongjong Area of environmentally friendly construction and to rate its current development status, exposing any problems and offering alternative solutions. In this paper, the current state of constructions in Songdo Area and Yeongjong Area were reviewed. Then a quantitative analysis and assessment for the Songdo Area and Yeongjong Area constructions of apartments, complex buildings, office buildings, school facilities, store and hotel facilities were conducted by using green building certification criteria. Finally the synthetic results of environmental performance evaluation for Incheon Free Economic Zone's Songdo Area and Yeongjong Area constructions and follow-up suggestions were described.

• 한국항공운항학회지
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• 제32권1호
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• pp.10-18
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• 2024

Domestic aviation law stipulates methods and matters for safe and efficient navigation in accordance with the International Civil Aviation Convention. Following the International Civil Aviation Convention is very important for aviation safety because it not only presents domestic standards but also ensures that the safety standards presented by ICAO are implemented. If the above criteria are not met, it is a very important regulation as well as domestic legal effect as other member countries can be directly or indirectly affected by intensive monitoring by ICAO even without direct legal sanctions. Domestic aviation safety management conducts safety management evaluation according to USOAP and is considered to have the highest implementation rate among countries that have received USOAP so far. In this paper, we would like to ways to improve by comparing and analyzing how domestic aircraft reflect the contents of Annex 1 based on ICAO Annex 1: Personnel Licensing among the annexes of the ICAO.