• Journal of Korean Dental Science
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• 제5권1호
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• pp.7-12
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• 2012

Purpose: To examine the antibacterial effectiveness of silver nanoparticles (SNP) mixed with commercial orthodontic adhesives. Materials and Methods: SNP was prepared by dissolving silver perchlorate in an organic solvent and reducing it with ultraviolet radiation. SNP was then mixed with four commercial orthodontic adhesives (Light Bond, Blugloo, Transbond XT, and Fuji Ortho LC) (0.05 wt %), which were then formed into disc-shape specimens ($8.0mm{\times}3.0mm$). Commercial orthodontic adhesives containing no SNP were used as the control groups. Specimens of the four experimental and four control groups were incubated with streptococcus mutans and the medium turbidity was assessed at 3, 6, 9, 12, and 24 hours after incubation. The agar diffusion test was also performed to examine the growth inhibition zone of these groups. The data were statistically analyzed using a Wilcoxon rank sum test and t-test with a Bonferroni's correction (P<0.05). Result: The SNP containing groups had a superior antibacterial effect compared to the control groups. In the agar diffusion test, the control groups without SNP did not produce an inhibition zone, whereas the SNP containing groups showed inhibition zone of 10~13 mm. Conclusion: The incorporation of SNP into orthodontic adhesives can inhibit cariogenic bacterial growth.

• 융복합기술연구소 논문집
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• 제3권1호
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• pp.19-23
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• 2013

This study is concerned with air-conditioning system in use of thermoelectric device. It is introduced that the well designed structures for better cooling & heating performance with high efficiency. And also it is performed that the system performance test of four types trial products for the use of hybrid commercial vehicle. System performance is affected by many component parts, especially heat sink design & power control method. It is applied that dual extrusive fin tube with buffer zone for the effective radiating of circulating liquid in tube. And also it is applied that power supply method with constant-current system. It is attained that system cooling capacity is 1.2kW, COP is 0.95.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.518-523
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• 1995

To improve the set comfort of commercial vehicles in various road conditions, it is necessary to design a seat shock absorber which can avoid the vibration zone imposing the discomfort feeling and fatigue on drivers. Through the vibration and dynamic analysis, a shock absorber that has 4 steps of damping ability is developed. Dynamic characteristics analysis of the seat damper is performed considering each valve and oil path for the design purpose.

• 전기학회논문지
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• 제62권2호
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• pp.184-189
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• 2013

Compared to a multiphase SRM, a single-phase SRM has some advantages, such as lower number of switches and power converter size, which leads to gradually increasing in the household appliances and industrial applications. But the torque dead zone is existed in the single-phase SRM which decreases the starting capability of the motor and increases the torque ripple. In order to solve the aforementioned problems, a single-phase hybrid SRM with commercial ferrite permanent magnet is proposed in this paper. Basic design principle for the proposed structure is described. To verify the proposed structure, FEM is employed to get the characteristics of the proposed structure. Based on the analysis, a prototype is designed and manufactured. And, the experimental system is also constructed. The validity of the proposed structure is verified by the experimental results.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.84-85
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• 2021

The fire that broke out in a residential and commercial complex in Ulsan in October 2020 was large, but no deaths occurred. For this reason, there was a difference from the previous cases, so it was analyzed through field survey. The fire was expanded to the entire building by aluminum composite panels constructed by external heat method and SMC panels in evacuation safety zones, and fire was expanded to nearby mart due to wind on the day of the fire, and there were many evacuation spaces such as 15th, 28th, and rooftop heliports.

• 한국지리정보학회지
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• 제9권1호
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• pp.149-157
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• 2006

본 연구는 부산시의 GIS 데이타베이스를 활용하여 먼저, 입지포텐셜 분석을 위한 지표를 설정하여 각 지표별 Rank-Map을 작성하였다. 다음으로 각 상업 업무시설이 입지할 가능성을 예측할 수 있는 입지 포텐셜 ($P_i$)을 분석하여 제안하였다. Rank 1, 2로 분류되는 존의 건물용도 현황을 보면, 상업시설 용도가 차지하는 비율이 높음을 알 수 있었다. Rank 4~7까지의 존은 환경보전적 차원에서 비 상업계 용도지역이 지정되고 관리될 필요가 있다고 사료된다. 또한, 본 연구에서 제안한 입지 포텐셜은 용도지역 지정시 상업계 용도지역 지정의 기초자료로서 활용할 수 있다고 사료되어진다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1330-1333
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• 2004

The methodology for modeling building energy consumption is well established for energy saving calculation in the temperate zone both for performance-based energy retrofitting contracts and measurement and verification (M&V) projects. Mostly, statistical regression models based on utility bills and outdoor dry-bulb temperature have been applied to baseline monthly and annual whole building energy use. This paper presents the application of neural networks (NN) to model landlord energy consumption of commercial buildings in Singapore. Firstly, a brief background information on NN and its application on the building energy research is provided. Secondly, five commercial buildings with various characteristics were selected for case studies. Monthly mean outdoor dry-bulb temperature ($T_0$), Relative Humidity (RH) and Global Solar Radiation (GSR) are used as network inputs and the landlord monthly energy consumption of the same period is the output. Up to three years monthly data are taken as training data. A forecast has been made for another year for all the five buildings. The performance of the NN analysis was evaluated using coefficient of variance (CV). The results show that NNs is powerful at predicting annual landlord energy consumption with high accuracy.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.369-372
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• 2007

about commercial business of car black box, mirror vision for car black box deal with analysis of Existing Car Black boxes in market to provide the objective information associated with surrounding scene of car instead of witness, we experimented on suitable structure of all direction to cover surrounding of car considering dead zone where can't see at short distance and realized simple structure of gathering scene using mirror and lens and by saving the number of camera and MUX of pre-circut

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2001년도 제33회 춘계학술대회 개최
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• pp.243-247
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• 2001

As a means to reduce stiction in the landing zone padded sliders can be used. In this work the performance of padded slider was investigated using a commercial spin stand. The friction and acoustic emission signals were measured during the experiment. It is shown that padded slider show superior friction and AE characteristics. However, the wear properties of the pads should be further Improved.

• 한국도로학회논문집
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• 제13권1호
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• pp.119-127
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• 2011

본 연구는 생활도로 속도관리 방안으로 선진국에서 추진되고 있는 Zone 30 제도를 우리나라의 도로 및 교통여건에 맞게 도입하고, 시범운영을 통해 시행의 효과를 분석하는 동시에 시행상의 문제점을 분석하여 향후 제도 확산을 사전에 대비하고자 하였다. 시범운영지역으로 선정된 곳은 경찰청 T/F에서 현장 조사 및 전문가 의견을 수렴하여 상가 밀집지역 주변도로 중 편도 2차로 이내의 도로이며, 보행자 통행량이 많고 보행자 사고율 또는 위험성이 높은 경기 고양시 일산구 장항2동 (면적 $0.65km^2$)이다. 우선 Zone 30 제도 검토 측면에서 생활도로와 생활도로구역의 용어를 정의하고, 생활도로 유형화 및 운영방안을 수립하였으며, 시범사업은 대상지에 대한 정밀 조사를 통해 문제점 및 개선점을 도출하고, 그에 따른 시설개선도면을 작성하여 해당 지자체와 협의하여 시설을 설치완료하였다. 시설 설치 전과 후로 나누어 효과분석을 수행한 결과 차량 속도는 시행전에 비해 가로별로 5~15km/h 감소하였으며, 교통사고의 경우도 시행전 25건에서 시행후 19건으로 24%가 감소한 것으로 나타났다. 또한 속도관리 사업의 시행과정이 빠르고 시설비용이 저렴해 전국적인 확산시행이 유리하여 보행자사고 감소에 실질적 기여가 가능한 것으로 나타났다. 시범사업 연구결과를 토대로 생활도로구역 속도관리 사업추진 방안 등을 제시하였다.