• 한국의료질향상학회지
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• 제28권2호
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• pp.39-49
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• 2022

Purpose:The infection and isolation program used at a university hospital in A city was assessed and improved to provide medical staff with easy-to-understand information on isolation precautions and infectious diseases. Methods: Based on the results of the root cause analysis, the infection and isolation alarm computer program was improved. Subsequently, a survey was conducted with infection control leaders and unit managers (n=98) within the department to evaluate the degree of improvement. Results: The isolation registration and release procedures were simplified and unified to prevent confusion among the relevant departments. Additionally, the screen composition was improved so that various information related to infection can be easily accessed. After improvement in the program, the rate of isolation registration (53.0% to 100.0%, p<.001) and user satisfaction (67.6% to 92.2%) improved. Conclusion: This study will help improve the program so that other medical institutions can comply with the isolation precautions in accordance with the type of infections.

• 한국정보통신학회논문지
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• 제13권1호
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• pp.17-22
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• 2009

TDD 시스템에서는 스위치나 써큘레이터를 이용해서 송수신 경로를 구분한다. 송수신 경로의 격리도가 낮은 경우 송신신호는 수신기에 간섭원으로 작용하며, 수신기의 성능을 악화시킨다. 본 논문에서는 TDD 시스템에서 송신 경로와 수신 경로 사이에 높은 격리도를 갖는 방법을 제안한다. 또한 논문에서 제안한 격리도 향상 방법의 타당성을 검증하기 위해서 제안한 격리도 향상 모듈을 제작하였고, 제작된 격리도 향상 모듈의 특성을 시험하였다. 특성 시험 결과 제작된 격리도 향상 모듈은 30MHz 대역폭에서 44.8dB 이상의 격리도 향상이 있음을 확인하였다.

• 소음진동
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• 제9권3호
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• pp.477-484
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• 1999

This study aims to present proper thickness of resilient mount and pattern of chips for the improvement of impact sound isolation. To achieve this aim, field tests were performed to evaluate the performance of impact sound isolation of pilot samples using waste tire chips against light and heavy-weight impacter, which samples were installed over concrete slabs of an apartment housing. In this study, the experiments were performed by the impact sound level of floors in KS F 2810 "Method for field measurement of floor impact level". As results, a flooring structure using waste tire chips as a resilient mount, with no relation to chip's types, has enhanced performance by 1~2 degree in light impact sound isolation, while it has improvement in heavy impact sound isolation. And fiber-type chips have better performance than granule-type ones when they overlaid concrete slab with 15~20 mm of thickness. For the improvement of impact sound isolation, it is recommended that insulating materials should be applied at joints between floating floors and walls, or floating floors and a doorframes, and also waterproof papers should be used for the effective thickness of resilient mount.ent mount.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 추계학술대회논문집
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• pp.269-274
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• 2004

The aims of this study were to Investigate the floor impact noise isolation performance of floating floor with isolation materials and propose the improvement direction of floor impact noise measurement method and evaluation classes using impact ball. Reduction of light-weight impact sound pressure level can be achieved by the finishing materials, such as vinyl finishing material and wooden flooring with isolation materials. Floor impact noise Isolation material which satisfy the properties of the floor impact noise isolation materials cause resonance in the low frequency band and worsen heavy-weight impact sound pressure level. Heavy-weight impact sound level can be reduced by using noise reduction flooring, ceiling and increase of slab thickness. Strong impact force in low frequency bang below 63Hz of bang machine is not similar to human impact source and causes some problem in evaluating heavy-weight impact noise but heavy-weight impact noise measurement and evolution using impact ball which is very similar to human impact is more reliable than bang machine. Correction value on the background noise and sensitivity of residents should be considered on the floor impact noise evaluation classes.

• 한국전자파학회논문지
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• 제29권10호
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• pp.739-744
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• 2018

본 논문에서는 비발디 안테나 소자 간 격리도 향상을 위해, 메타구조 기반 흡수체의 한 종류인 double split ring resonator(DSRR)를 제안하였다. Unitcell 모의실험을 통하여 흡수체로 동작하는 DSRR을 설계하였으며, DSRR을 통한 격리도 향상을 확인하기 위하여 $1{\times}2$ 비발디 안테나에 적용하였다. 제안된 DSRR의 unitcell 크기는 $5mm{\times}5mm{\times}1.52mm$이며, 총 6개의 unitcell이 사용되었다. 제안된 DSRR의 성능 검증을 위하여 DSRR 적용 유무에 따른 $1{\times}2$ 비발디 안테나를 제작 및 측정하였으며, 측정 결과 DSRR이 적용된 비발디 안테나는 DSRR이 적용되지 않은 비발디 안테나에 비해 20 dB의 격리도 향상을 보였다.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2003년도 춘계 학술발표회논문집
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• pp.93-100
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• 2003

Seismic isolation systems can improve the seismic safety of nuclear power plants by decreasing seismic force transmitted to structures and equipment. This study evaluates the effectiveness of equipment seismic isolation systems by the comparison of core damage frequencies in non-isolated and isolated cases. It can be found that the seismic isolation systems increase seismic capacity of nuclear equipment and decrease core damage frequencies significantly. The effect of equipment isolation is more significant in the PGA range of 0.3g to 0.5g.

• 한국전자파학회논문지
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• 제27권3호
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• pp.229-238
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• 2016

본 논문에서는 배열안테나의 성능개선의 한 방법으로 표면파제어를 통한 격리도 개선에 관한 연구를 진행하였다. 배열의 소자 간 격리도 개선을 위해 Perfect Magnetic Conductor(PMC)와 SOFT-표면을 도입하였으며, 접지면의 중앙부에 이들을 삽입하여 모의실험을 진행함으로써 격리도 변화와 성능개선 유무를 알아보았다. 모의실험 결과, E-plane 배열에서 PMC와 SOFT-표면 모두 최대 40 dB 이상의 격리도 향상과 더불어 최대 2.2 dBi 정도의 이득 개선을 확인하였으며, H-plane 배열의 경우, 표면파 전파를 통한 상호결합보다 공기 중의 field를 통한 상호결합이 보다 크게 작용하는 것을 확인하였다. 이 연구는 향후 소형 배열안테나 개발 및 배열안테나의 성능개선 등에 유용하게 사용될 것이다.

• 한국전자파학회논문지
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• 제26권1호
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• pp.24-29
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• 2015

본 논문에서는 고투자율 자성기판을 이용한 광대역 안테나 격리도 특성 개선방법을 제안하였다. 제안된 안테나는 평판형 모노폴 안테나의 근접 자계 분석을 바탕으로 고투자율 자성기판을 안테나에 삽입한 형상이며, 동작주파수에서의 안테나 성능을 유지하고, 차단 주파수에서의 간섭을 최소화하여 근접한 안테나와의 격리도 특성을 개선한다. 격리도 개선을 확인하기 위해 동작주파수 2 GHz인 기준 모노폴 안테나를 설정하여 제안된 안테나와 기준 안테나의 $S_{21}$을 자성기판 삽입 전후로 측정하였다. 그 결과, 기존 안테나의 동작 성능은 유지하며, 2 GHz 이상의 차단 주파수에서 $S_{21}$이 5~10 dB 이상 개선되었으며, 고투자율 자성기판을 이용하여 안테나의 격리도 특성 개선이 가능함을 확인하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제27권3호
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• pp.39-49
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• 2021

Purpose: The negative pressure isolation ward is a key facility in preparedness and response to infectious diseases. For the sustainable operation of the facility, appropriate facility improvement is required. The experience of medical staff responding to infectious diseases in the COVID-19 pandemic provides effective informations for facility planning. Methods: The post occupancy evaluation (POE) was conducted by interviewing medical staff who is working on Nationally designated negative pressure isolation ward in general hospital. Floor plan analysis was conducted before field surveys for identifying facility characteristic and spatial composition. After that, field surveys were conducted at 3 hospitals, and interviews and fieldwork were conducted together. Results: It is necessary to increase the standard size of ward area from 15m² to 20m². The size of the doffing room has to be planned for accommodation of two or more people. Equipment storage, clean storage and waste storage also should be properly planned. There were almost no problems with the circulation in the ward. There was not enough space for medical staff. Implications: For a sustainable and safe negative pressure isolation ward planning, it is necessary to exploit learning from the medical staffs who have many experiences of coping with infectious diseases.

• KIEAE Journal
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• 제12권1호
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• pp.73-81
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• 2012

Floor impact sound has been most annoying for years among the noises which are produced in apartment. This study aims to analyze the improvement of floor impact sound by comparing the results of the test which was carried out for the wall slab type apartment and moment frame apartment, and also for the effect of advanced vibration isolation layer. Moment frame structure that main structure consists of column and slab has shown better performance for the heavyweight impact sound comparing with wall slab type structure which is general type in Korea. Stiffness of floor system was raised by reinforcing the stiffness of vibration isolation layer, and it was analyzed how much the floor impact sound performance was improved. The result showed that the reinforced floor had better performance than the existing floor system that uses lightweight porous concrete as vibration isolation material. In addition, a system used wire mesh in mortar showed improvement of floor impact sound than a system without wire mesh, and better performance for the frequency bands lower than 160 Hz which causes floor impact problem in wall slab type apartment.