• Journal of Trauma and Injury
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• 제24권1호
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• pp.25-30
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• 2011

Purpose: Major trauma patients should be transferred to a definitive care facility as early as possible because prompt management will prevent death. This study was designed to discover the obstacles leading to delayed transfers under the current emergency medical system in Korea and whether there are any negative outcomes associated with conducting procedures at primary care hospitals prior to transferring patients to higher levels of care. Methods: The medical records of major trauma patients with an Injury Severity Score above 15 within the past year were reviewed. Patients were divided three groups as follows: (A) came directly to our emergency center, (B) were transferred without CT or MRI scan at the primary care hospital and (C) transferred with CT or MRI scans. The transfer time of each group were compared and analyzed statistically. Additionally, the number and type of imaging performed at the primary care hospital were analyzed. Results: All qualified patients (n=276) were enrolled in this study: 121 patients in group A; 104 in group B; 51 in group C. There was a statistically significant difference in the transfer time between the three groups (p-value<0.001), and 79 (28.6%) were transferred to an emergency medical center within one hour. In group C, CT or MRI scans were performed an average of 1.86 times at the primary care hospital, and the median transfer time was 4 hours 5 minutes. Conclusion: Only 28.6% of the cases in the study arrived within the golden hour at a definitive care facility. Such delays are in part the result of prolonged times at the primary care hospital for radiologic examinations, such as CT or MRI scans. Major multiple trauma patients should be transferred to a definitive care facility directly or as soon as the primary survey and the resuscitation of Advanced Trauma Life Support guideline are completed at the primary care hospital.

• 한국환경과학회지
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• 제9권5호
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• pp.389-392
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• 2000

In this study a packed tower was selected for the treatment apparatus of $NH_3$ gas produced in industry. Formerly latticework packing has been used in preventive facility of treatment of $NH_3$ gas. However recently metallic Ralu-Pack 250YC. structured packing is usually being used in petrochemical production plant. This study is for the application the packing to the $NH_3$ gas treatment in wet scrubbing process. In Air/water system hydraulic pressure drop dependent of specific liquid load and gas capacity factor was continuous and parallel from graph. The tower height can be determuined by the number of transfer unit and the height of transfer unit influenced on liquid distribution.

• Nuclear Engineering and Technology
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• 제48권4호
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• pp.906-914
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• 2016

We investigated the heat load imposed on the lower head of a reactor vessel by the natural convection of the oxide pool in a severe accident. Mass transfer experiments using a $CuSO_4-H_2SO_4$ electroplating system were performed based on the analogy between heat and mass transfer. The $Ra^{\prime}_H$ of $10^{14}$ order was achieved with a facility height of only 0.1 m. Three different volumetric heat sources were compared; two had identical configurations to those previously reported, and the other was designed by the authors. The measured Nu's of the lower head were about 30% lower than those previously reported. The measured angular heat flux ratios were similar to those reported in existing studies except for the peaks appearing near the top. The volumetric heat sources did not affect the Nu of the lower head but affected the Nu of the top plate by obstructing the rising flow from the bottom.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.59-60
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• 2015

무선전력전송은 각종 전자기기에 필요한 전력을 전선 없이 무선으로 공급하는 기술이다. 무선전력전송 기술은 자기 코일을 이용하는 근거리 무선전력전송 기술과 안테나를 이용하는 원거리 무선전력전송 기술로 구분된다. 본 연구에서는 시설물 관리용 전원공급 문제를 해결하기 위한 방안으로 UWB를 활용하여 초정밀 측위가 가능한 RTLS 태그와 무선 충전부를 설계하였다. 무선 충전 패드는 자기 공진 방식을 이용하여 4개의 기기를 충전할 수 있는 기능을 제공한다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.1067-1072
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• 2009

In vapor compression systems which use refrigerant as a working fluid, the oil is commonly used for compressor lubrication. Since the presence of lubrication oil can change the characteristics properties of refrigerant, the oil affects the heat transfer performance of heat exchanger to a large extent. In this paper, we focus on the effect of PVE oil experimentally on heat transfer performance of the fin-tube heat exchangers which use R410A as a refrigerant. To evaluate the heat transfer performance, the refrigerant to air type test facility chamber has been used. Fin-tube heat exchanger with grooved has been tested while according to the oil mass fraction variation from nearly zero to 1.7 wt%. It was found that the low level of oil mass fraction has an obvious effect on heat transfer performance, while the high level seems no significant influence. The influence of the oil mass fraction to heat transfer performance, however, is different between evaporation and condensation.

• 한국지리정보학회지
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• 제11권3호
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• pp.127-135
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• 2008

여러 교통수단이 만나는 교통 결절점에서 이용자의 수단간 환승의 편의를 도모하는 환승시설은 명확한 합리적 기준과 원칙에 의해 설계되어야하나 우리나라의 경우 주로 설계가의 주관과 외관에 치중되어 효율적이고 기능적이지 못한 경우가 많다. 본 연구의 주목적은 환승시설의 운영효율성과 서비스 질을 제고하기 위한 기본적 설계원칙의 제시와 이에 기초한 환승시설 설계과정 소개에 있다. 이를 위해 설계과정에 기초한 고려사항과 필요자료를 검토하고 이를 기초로 GIS를 활용한 교통DB를 구축하였다. 구축된 교통DB는 설계과정에 요구되는 항목 뿐 아니라 시설 관리에도 적용될 수 있는 포괄적인 내용을 포함한다. 본 연구에서 제시된 원칙을 부산역 설계안에 적용하여 문제점을 파악하고 제시된 원칙에 기초하여 개선안을 제시하였다.

• 한국재난정보학회 논문집
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• 제11권1호
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• pp.89-96
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• 2015

선하역사 내부에 발생하는 소음을 저감하기 위해서는 진동의 감소가 필요하며, 보다 효과적인 진동 저감 대책 수립을 위해서는 궤도-접속교량-구조물의 상호작용 특성을 감안하여 열차 운행으로 발생하는 진동이 전달되는 경로 및 특성에 대한 명확한 이해가 필요하다. 이 논문에서는 국내 선하역사 현황을 구조적으로 분류하고 대표 선하역사에 대한 진동 측정을 통하여 역사에 발생하는 진동의 전달 특성을 분석하였다. 주파수응답을 통한 분석 결과 궤도의 진동이 역사로 전달되면서 고주파 성분이 큰 감소를 나타냈으며, 일부 역사에서 저주파 대역 내 증폭 구간이 발견되었다. 플로팅궤도가 적용되거나 TPS 구조의 역사는 궤도로부터 전달되는 진동이 비교적 큰 감소를 나타냈다.

• 한국산학기술학회논문지
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• 제16권4호
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• pp.2911-2916
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• 2015

선하역사는 구조물 상부에 열차가 운행하는 구조로서 타 역사 구조물에 비하여 역사 내의 소음 진동에 취약한 구조이다. 선하역사의 진동 특성을 보다 정확히 파악하기 위해서는 접속교량에서 전달되는 진동에 대한 분석이 필요하다. 이 논문에서는 실험 및 해석을 통하여 접속교량에서 선하역사로 전달되는 진동의 특성을 분석하였다. 대상 구조물은 경춘선 금곡역으로 ABAQUS 3차원 수치해석 모델을 이용하여 해석을 수행하였다. 받침 변화에 따른 접속교량과 역사의 전달 특성 변화를 분석하기 위하여, 철도교량에 적용되어온 다양한 받침의 역학적 성질을 고려하여 해석을 수행하였다. 현장 진동 계측은 열차진행 방향에 따라 접속 교량 및 역사 구조물에 대하여 가속도계를 이용하여 수행하였다.

• Journal of Biosystems Engineering
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• 제35권6호
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• pp.393-400
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• 2010

Uniform and rapid pre-drying of mandarin is important to improve the storage quality. The aim of this study was to suggest the basic design of forced ventilated pre-drying facility for mandarin by thermal flow analysis using computational fluid dynamics software (FLUENT 6.2). Developed CFD simulation model was verified by comparison with experimental data. Airflows and temperature distributions in the five conceptional designs including existing ordinary temperature storage rooms were analyzed and appropriate basic design was determined. Analysis of the effect of arrangement of windows and exhaust fans on thermal flow in facility was carried out for more detailed design. The results of this investigation showed that the predicted airflow velocity by CFD simulation showed a good agreement with the measured value and optimum design condition for simulated forced ventilated pre-drying facility of mandarin has two exhaust fans and two windows on both sidewalls and cover on loaded mandarin.

• Nuclear Engineering and Technology
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• 제53권9호
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• pp.2909-2917
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• 2021

Following the launch of Rare Isotope Science Project in December 2011, a heavy ion accelerator complex in South Korea, named RAON, has since been designed. It includes a muon facility for muon spin rotation, relaxation, and resonance. The facility will be provided with 600 MeV and 100 kW (one-fourth of the maximum power) proton beam. In this study, the graphite target in RAON was designed to have a rotating disk shape and was cooled by radiative heat transfer. This cool-down process has the following advantages: a low-temperature gradient in the target and the absence of a liquid coolant cooling system. Monte Carlo simulations and ANSYS calculations were performed to optimize the target system in a thermally stable condition when the 100 kW proton beam collided with the target. A comparison between the simulation and experimental data was also included in the design process to obtain reliable results. The final design of the target system will be completed within 2020, and its manufacturing is in progress. The manufactured target system will be installed at the RAON in the Sindong area near Daejeon-city in 2021 to carry out verification experiments.