• Wind and Structures
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• 제14권1호
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• pp.71-80
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• 2011

This study presents a decision making process for installation of wind barrier which is used to reduce the wind speed applied to running vehicles on expressway. To determine whether it is needed to install wind barrier or not, cost and benefit from wind barrier are calculated during lifetime. In obtaining car accidental risk, probabilistic distribution of wind speed, daily traffic volume, mixture ratio in the volume, and duration time for wind speed range are considered. It is recommended to install wind barrier if benefit from the barrier installation exceed construction cost. In the numerical examples, case studies were shown for risk and benefit calculation and main risky regions on Korean highway were all evaluated to identify the number of installation sites.

• 한국자동차공학회논문집
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• 제24권2호
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• pp.191-197
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• 2016

RCAR low speed impact test estimates repair cost of the impacted vehicle. In this study, for a mid-size vehicle front body model, structural performance for RCAR low speed impact were analyzed with changing the bumper stay shape and size. First, for improving the impact load transfer mechanism to side member the stay rear section shape at connecting area with side member was modified and the stay outer was redesigned to be normal to the barrier. Next, the investigation on stay thickness effect was carried out and the performances of several models with different forming shape were compared. The final design showed 13mm decrease in the maximum barrier intrusion distance and greatly reduced side member deformation. Additional analyses explained the validity of the final design.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제50권6호
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• pp.263-272
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• 2001

The paper presents the design of a segmented type synchronous reluctance motor(SynRM) to increase its torque and power factor. The main feature of a segmented type synchronous reluctance motor is the flux barrier. Thus, the design process to find optimum value of various geometric parameters including flux barrier will be explained. Optimum value of each parameter is found where the d, q inductance difference and saliency ratio are maximized because these inductance characteristics are related to torque and power factor. Finite Element Analysis will be used to simulate motor characteristics. Analysis results of redesigned SynRM show higher saliency ratio over 10 and improved value of maximum power factor.

• 한국전기전자재료학회논문지
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• 제24권1호
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• pp.57-63
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• 2011

Dielectric Barrier Discharge (DBD) reactor with sinsodual AC type of power supply is very widely adopted for its compact size and effective discharging mechanism to generate high density of ozone radicals. However, at the aspect of design on power supply, its optimal switching conditions and topology is achieved by empirical test. Therefore, throughout this paper, it is proposed a design method of DBD power supply to guarantee a maximum ozone yield rate in accordance with DBD reactor modification and impedance variation when rapid gas discharging in the DBD reactor is proceeded.

• 조명전기설비학회논문지
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• 제23권11호
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• pp.28-33
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• 2009

Average torque of PMa-SynRM(Permanent Magnet-assisted Synchronous Reluctance Motor) is changed by magnet form inserted to the barrier. Because the magnet structure inserted to the barrier influences to the magnet-torque and reluctance torque. Therefore, this paper present a suitable permanent magnet form design for maximum torque when the magnet quantites are always fixed. And each motor characteristic such as average torque, torque ripple, cogging torque and back-EMF are analyzed by FEM(Finite Element Method) for optimal design.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.815-816
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• 2006

This paper proposes a novel design method for flux barrier which built in q-axis in rotor of IPM type BLDC motor. It aims to reduce the motor vibration with reduced cogging torque and lessened torque ripple by the sinusoidal waveform distribution of flux generated in the permanent magnet, which results from designed flux barriers. Design of flux barrier optimized using the Taguchi methods that considered multiple quality characteristics, such as cogging torque, average torque and efficiency are considered. The result of proposed method is compared and verified with 2D finite element method (FEM).

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제10권2호
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• pp.125-133
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• 2004

Safety, accessibility and distinguishment as the concept of architectural planning and design are demanded in staircases due to increase of the old aged people and disabled people's enlarged social participation. In this research is tried to provide the importance of vertical walking function at the design for the staircases. For this reason, structural elements of the staircases are studied in the ergonomic aspect for barrier-free environment and a comparative study is made on the regulations of the staircases in the inside and outside of the country in disabled & aged people's view. Based on this study, the quality of the staircases in public facilities and Apartments is analyzed. As the result, it has been proved that the vertical walking function of the staircases is the most fundamental characteristic of the staircases design before everything else.

• 전기학회논문지
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• 제63권1호
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• pp.48-53
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• 2014

Generally, the usage motor in the vehicle is exposed to highly ambient temperature and large vibration according to repeatedly starting and stopping during very short time. So, in this paper, the rotor shape design was performed to improve demagnetization endurance by considering starting current of Brushless DC Motor (BLDCM) through Finite Element Method(FEM). As a result, the end of Permanent Magnet (PM) in the basic model was occurring a partial irreversible demagnetization by starting current. To solve this problem, the installing flux barrier was limited to flux line on the core. Accordingly, demagnetization endurance and operating characteristics were improved.

• 교육녹색환경연구
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• 제16권3호
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• pp.9-17
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• 2017

본 연구는 단설유치원 교직원과 교육청의 시설담당공무원을 대상으로 장애물 없는 생활환경 인지도와 유치원의 장애물 없는 생활환경 구축을 위해 강화 또는 완화해야 할 편의시설을 조사하였다. 또한 장애물 없는 생활환경 조성을 위해 기설 단설유치원의 개선 편의시설에 대해서 조사하여 개선방안을 도출하였다. 첫째, 제도적 측면에서 우리나라 현행 "장애인 노인 임산부 등의 편의증진 보장에 관한 법률 시행규칙"을 개정하여 유치원의 의무 권장 설치대상 편의시설과 그에 따른 장애물 없는 생활환경 인증기준을 변경할 필요가 있다. 둘째, 시설 환경적 측면에서 기설 유치원에 장애물 없는 생활환경 인증 제도를 적용하기 위해서는 지형 또는 건물 구조상 개선이 어려운 항목은 배점을 낮게 조정하여 기설 유치원이 장애물 없는 생활환경 인증을 받을 수 있도록 활성화할 필요가 있다. 셋째, 사회 인식적 측면에서 장애물 없는 생활환경에 대한 인지도가 아직도 높지 않은 것으로 나타났다. 교육청 및 인증기관을 중심으로 장애물 없는 생활환경 인증제도에 대한 홍보와 교육을 강화하여야 한다. 기존유치원과 신설유치원의 장애물 없는 생활 환경 조성 방향의 핵심은 보호능력과 안전의식이 부족한 유아의 특성을 감안하는 것이다. 모든 출입구의 높이 차이를 제거하고 자동문을 설치하여 편리성과 안정성을 높이고, 위생시설은 유아가 사용하기 편리하도록 적절한 높이와 공간 확보가 필수적이다. 최근 유아기 공동체 활동이 강화됨에 따라 강당이나 도서관의 각종 편의시설 확충과 피난안전시설도 강화되어야 한다. 본 연구는 사회적 약자인 유아들의 교육 생활 공간인 단설유치원을 대상으로 장애물 없는 생활환경 조성 방안을 연구하였다는 점에서 의의가 있다. 따라서 향후 본 연구를 토대로 기설 유치원에 적합한 장애물 없는 생활환경 인증지표에 대한 개선 연구가 시도된다면 유치원의 장애물 없는 생활환경 변화를 촉진할 수 있는 계기가 될 것으로 기대한다.

• 한국실내디자인학회논문집
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• 제26권3호
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• pp.13-24
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• 2017

Promoting barrier-free living environments is necessary in residential facilities on which senior citizens rely most of their lives. Safety of elder people can be reassured by a certification system based on the existing barrier-free certification program in public facilities. The range of certification does not cover all living area, but is limited to the bathroom, which is a sanitary space. Given the nature of BIM modeling, an existing multi-family building was selected and modeled, as the certification process requires all the necessary information and various viewport. BIM modeling of the bathroom was conducted in accordance with the requirements of the certification for barrier-free living environment. The results suggested that there is a need for a removal of thresholds, larger doors, better selection of finishing materials, sufficient room for a wheelchair, larger space next to the toilet, and the availability of an emergency bell and grab bars. Such information supports the potentials of BIM modeling, and it is expected that an automated certification system would be established in the foreseeable future.