• 한국도로학회논문집
• /
• 제19권5호
• /
• pp.163-171
• /
• 2017

PURPOSES : Traffic safety facilities are used to prevent traffic accidents before they occur by providing drivers with information on traffic situations and the geometric design of roads. However, some facilities not defined in guidelines do not meet installation criteria, yet are being installed and used in order to increase efficiency in traffic flow and prevent traffic accidents in a specific expressway zone. In this study, we have evaluated the effect of delineation system which are not defined in the guideline criteria. METHODS : Different virtual scenarios were created for roads using expressway median barrier chevron signs, with a driving simulator used to evaluate the installation and operational effect of such signs. Ten experiments were performed with left- and right-curved roads at curve radius intervals of 500 m, from 500 m to 2,500 m. RESULTS : For sections with a curve radius of more than 1,500 m, drivers had a clear tendency toward stable driving regardless of delineation system. When a chevron sign is installed on a protection fence in the road curving left, an expanded installation is recommended up to the section with a curve radius of 1,000 m. According to the analysis results for the RHB (Relative High Beta spectrum), driving concentration also improved up to a curve radius of 1,000 m. CONCLUSIONS :The experiment result indicates the extent of biasing within a lane and the manipulation amount of steering handle, were analyzed and found to be affected by curve radius and road alignment regardless of delineation system.

• 대한토목학회논문집
• /
• 제35권3호
• /
• pp.639-645
• /
• 2015

최근 지상역 승강장에서 승객의 안전 확보, 지상역 조건과 열차 차종 자동 인식에 따른 상하 개폐 기능이 탑재된 Rope 스크린도어의 실용화 기술에 대한 연구개발이 수행되고 있다. 현재 대구도시철도 2호선 문양역에 2013년 3월부터 시범설치 운영 중에 있으나, 앞으로 개선된 RPSD에 대하여 고속철도 역사를 대상으로 각 철도운영기관의 니즈에 부합하고, 철도 승강장 안전시설로써 역사에 적합한 시범사업 대상지를 선정할 필요성이 있다. 따라서 본 연구에서는 AHP를 이용하여 각 KTX역의 위험도 분석과 시설관리 및 운영기관의 사업추진의지 등 정책적 분석기준에 따라 RPSD 설치 대상지 우선순위를 분석하였다. 또한 AHP를 적용함에 있어 사례 분석할 KTX역과 같이 평가대상이 많을 경우 쌍대비교에 의한 우선순위 평가가 불가능하기 때문에, 상위 평가항목에 대해서는 상대평가에 의해 가중치를 구하고, 각각의 하위 목적요소에는 평점에 의한 절대평가법을 조합하여 우선순위를 산정하였다.

• 한국재난정보학회 논문집
• /
• 제15권4호
• /
• pp.540-547
• /
• 2019

연구목적: 본 연구는 건설에 따른 하자보수 소송이 빈번히 발생하고 있는 공동주택 방화문 성능에 대한 문제점과 기능개선의 우선순위를 도출하는 것을 목적으로 한다. 연구방법: 연구를 위하여 방화문의 설계 및 시공 관련 전문가를 대상으로 설문조사를 시행하고 그 결과를 계층적분석기법(AHP)를 이용하여 분석하였다. 연구결과: 분석결과 2계층에서는 '방화구획 설치기준 강화' 28%, '설계기술 강화' 19.5%,'시공기술 강화' 19.3% 의 순이었으며, 3계층에서는 '바닥면적별 설치기준 강화' 11.8%, '내화구조 기준강화' 9.9%의 순으로 개선에 대한 우선순위로 분석되었다. 결론: 본 연구를 통해 화재시 거주자들의 생명과 직결되는 방화문의 안전성능에 대한 문제점을 인식하고 전문가들이 생각하는 기술적, 정책적 개선사항을 고려한 제도적 개선방안이 마련되어야 할 것이다.

• 대한토목학회논문집
• /
• 제39권1호
• /
• pp.73-80
• /
• 2019

교통안전과 효율적인 교통관리의 도로교통정책이 간선도로 등 일정규모 이상의 도로에서 주로 이루어지고 있어 상대적으로 생활도로의 안전성은 열악한 상황이다. 특히, 보행자의 안전이 주가 되어야 할 주거지역의 생활권 도로까지 차량이 우선시 되는 경우가 발생하는 등 상대적으로 생활도로에 대한 개선은 이루지 못한 실정이다. 이에 본 연구는 생활도로 내 교차로 알림이 설치기준을 제시하기 위하여 광주광역시를 중심으로 현장조사를 실시하였고, 생활도로내 교차로에 영향을 미치는 영향인자와의 관계를 다중회귀분석을 통한 예측모형으로 도출하였다. 나아가 생활도로내 사고예측 모형을 통한 실측값을 제시 한 후 교차로 알림이가 설치된 지점의 값과 비교 검증하여 생활도로내 교차로 알림이 설치기준을 제시하였다. 이를 통해 생활도로 내 잦은 교통사고를 예방하고 생활도로를 이용하는 이용자들의 편의성 및 안전을 고려한 교차로 알림이 설치가 이루어 질 수 있을 것으로 기대된다.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2011년도 춘계학술대회 논문집
• /
• pp.821-826
• /
• 2011

A basic concept for selection criteria of measuring places of RVI CVAP is to determine measuring places and sensors based on the results of the hydraulic and structural analysis for RVI CVAP in APR1400. In addition, there is the important selection criteria to determine measuring places for measurement of RVI CVAP ; the first is to choose measuring places according to U.S. NRC R.G. 1.20, the second is to select measuring places by RVI design review, the third is to option on the basis of measurement results of SYSTEM 80, the forth is to decide using review results on a design change of a reactor and the last is to determine using the review on the possibility of installation/removal of sensors and structures for the measurement. We developed selection criteria of measuring places for RVI CVAP in APR1400 and this will be directly applied to the measurement program for RVI CVAP.

• 대한방사선기술학회지:방사선기술과학
• /
• 제45권2호
• /
• pp.127-134
• /
• 2022

In order to overcome the image quality limitations of the conventional C-arm, a flat panel detector (FPD) is used to enhance spatial resolution, detective quantum efficiency, frame rate, and dynamic range. Three-dimensional (3D) visualized information can be obtained from C-arm computed tomography (CT) equipped with an FPD, which can reduce patient discomfort and provide various medical information to health care providers by conducting procedures in the interventional procedure room without moving the patient to the CT scan room. Unlike a conventional C-arm device, a C-arm CT requires different basic safety and essential performance evaluation criteria; therefore, in this study, basic safety and essential performance evaluation criteria to protect patients, medical staff, and radiologists were derived based on International Electrotechnical Commission (IEC) standards, the Ministry of Food and Drug Safety (MFDS) standards in Korea, and the rules on the installation and operation of special medical equipment in Korea. As a result of the study, six basic safety evaluation criteria related to electrical and mechanical radiation safety (leakage current, collision protection, emergency stopping device, overheating, recovery management, and ingress of water or particulate matter into medical electrical (ME) equipment and ME systems: footswitches) and 14 essential performance evaluation criteria (accuracy of tube voltage, accuracy of tube current, accuracy of loading time, accuracy of current time product, reproducibility of radiation output, linearity and consistency in radiography, half layer value in X-ray equipment, focal size and collimator, relationship between X-ray field and image reception area, consistency of light irradiation versus X-ray irradiation, performance of the mechanical device, focal spot to skin distance accuracy, image quality evaluation, and technical characteristic of cone-beam computed tomography) were selected for a total of 20 criteria.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
• /
• 제26권2호
• /
• pp.31-38
• /
• 2020

Purpose: The ramp is an important facility for the barrier free access and vertical circulation of users of various buildings, including users of walker, wheelchair users, stroller users, and baggage carriers. The installation standards for ramps in Korea have various problems during construction and BF certification. It is necessary to improve the criteria for ensuring practical mobility and safety. Method: Korean standard, International Standard(ISO 21542, 2011), German Standard(DIN 18040-1, 2010), Austrian Standard(OENORM B 1600, 2017), Swiss Standard(Norm SIA 500, 2009), Canadian Standard(Building Standards Guide, 2017), American Standard(ADA Standards, 2010) were investigated and analyzed. A comprehensive improvement of the ramp installation standards is proposed. Results: The ramp is a necessary facility for the barrier free access and vertical circulation of the disabled. It shall be installed with comprehensive consideration of the appropriate slope of the ramp, the distance of the continuous slope, the handle and upstand for pedestrian safety. In order to improve convenience, setting the proper slope and limiting the length of the slope are very important, and improvements are required to the levels presented by international and foreign standards. The unclear standards of Korean law and BF certification standards should be clearly improved so as not to be misinterpreted in construction and Barrier Free Certification. Implication: International and foreign standards should be reviewed to ensure practical mobility and safety. And comprehensive improvement measures should be presented through continuous research.

• 상하수도학회지
• /
• 제29권6호
• /
• pp.659-666
• /
• 2015

In this study, Hazen-Williams C value of pipes in wide waterworks system was estimated and statistically analyzed. Hazen-Williams C value of water pipe was predicted after 20 years of service period. From the results, it was found that C value of water pipe for treated water maintained higher value of 110 after 20 years of installation. Furthermore, it was found that velocity coefficients of steel pipe for less than and more than 20 years of installation were 117.7 and 109.3, respectively. C value of ductile iron pipe for less than and more than 20 years of installation were 118.1 and 114.2, respectively. In this study, it was also found that small value of C is used in the design of water pipe system. Therefore, excessively bigger size of pipe can be determined in the design of water pipe system. From the results of present study, optimum value of C can be used to avoid the oversized design of water pipe system.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제43권4호
• /
• pp.214-220
• /
• 2017

Maxillary sinus lift for dental implant installation is a well-known and versatile technique; new techniques are presented based on the physiology of intrasinus bone repair. The aim of this review was to determine the status of graftless maxillary sinus lift and analyze its foundations and results. A search was conducted of the literature between 1995 and 2015 in the Medline, ScienceDirect, and SciELO databases using the keywords "maxillary sinus lift," "blood clot," "graftless maxillary sinus augmentation," and "dental implant placement." Ten articles were selected for our analysis of this technique and its results. Despite the limited information, cases that were followed for at least six months and up to four years had a 90% success rate. Published techniques included a lateral window, elevation of the sinus membrane, drilling and dental implant installation, descent of the membrane with variations in the installation of the lateral wall access and suturing. The physiology behind this new bone formation response and the results of the present research were also discussed. We concluded that this is a promising and viable technique under certain inclusion criteria.

• 조명전기설비학회논문지
• /
• 제23권9호
• /
• pp.62-66
• /
• 2009

3개의 자속에 대한 유도전동기의 입력을 계산한 후 3점을 2차 보간하여 2차 함수를 만들고, 입력이 최소가 되는 새로운 자속을 구한 후, 이 자속을 이용하여 다시 2차 보간하여 입력이 최소가 되는 자속을 구하는데, 새로운 점을 사용한 2차 보간을 수렴조건을 만족할 때까지 반복해서 입력이 최소가 되는 자속을 구하는 방법을 제안한다. 시뮬레이션 결과 최대효율제어를 위한 자속으로 신속한 수렴이 가능함을 보인다.