본 연구는 강박스교의 기본계획 단계부터 실시설계 단계까지를 범위로 하여, Building Information Modeling (BIM)을 위한 데이터 모델인 Industry Foundation Classes (IFC)를 통해 구성요소의 의미정보를 생성할 수 있는 방안을 제시하였다. IFC기반의 의미정보 생성에 필요한 항목을 정의하기 위해 강박스교 구성요소의 설계 단계별 분류를 수행하였고, 이를 구성요소의 기능에 따른 물리적 표현요소와 위상에 따른 공간적 표현요소로 구분하여 IFC 프레임워크 내의 사용자 정의 속성집합을 활용하여 IFC에서 지원하지 않는 추가적인 항목을 생성하였다. 추가적으로 생성한 사용자 정의 속성의 유효성을 검토하기 위해 BIM 소프트웨어와 본 연구에서 개발한 강박스교 구성요소 의미정보 입력 인터페이스를 통해 IFC기반의 강박스교의 정보모델을 생성하였고, 이를 기반으로 하여 의미정보 질의를 통한 구성요소의 식별이 가능함을 확인하였다. 또한 IFC기반 강박스교 정보모델을 통해 구성부재의 수량 및 물량 산출을 수행하고, 설계도서를 통해 산출한 수량 및 물량 산출 결과 값과의 비교를 통해 본 연구에서 제안한 방법이 실제 업무에서도 활용할 수 있음을 확인하였다. This study ranges from planning phase to the detailed design phase of steel box girder bridge and proposes ways to generate semantic information of components through Industry Foundation Classes (IFC), a data model for Building Information Modeling (BIM). The classification of components of steel box girder bridge was performed to define information items required for identifying semantic information based on IFC, and spatial information items based on topology and physical information items based on functions of components were classified to create additional properties that does not support IFC by applying user-defined property set within the IFC framework. Steel box girder bridge information model based on IFC was implemented through BIM software and semantic information input interface, which was developed in this study to examine the effectiveness of the additionally created user-defined property. Furthermore, the quantity take-off of components was performed through information model of steel box girder bridge, and the applicability of the proposed method was tested by comparing the quantity take-off based on design document with the result.
Wind turbine system is converting wind energy into electric energy. In nature, torque of the blade is nonlinear function. To get a high quality electric power, system needs control of blade angle. The control of a blade is divided into a stall regulation type and a pitch control type. Pitch control type is more expensive and complicated, but it can make torque of the blade in accordance with variable wind. This paper shows 2㎿ pitch control system’s hardware and electric part.
본 연구에서는 신규 리어 시트 백 프레임 모델이 기존 리어 시트 백 프레임 모델 대비 동등 수준의 러기지 리텐션 시험의 충돌 변위를 제공하도록 적정한 브라켓 구조를 확보하고자 하였다. 시트 연결부인 하단 부시 힌지부 브라켓에 플랜지와 폼을 추가하고 두께를 기존 모델과 같은 2.3t에서 2.9t로 바꿔 기존 모델과 비교하였다. 이를 위해 시트 백 프레임의 슬레드 시험이 고려된 러기지 리텐션 시험의 유한요소 해석을 수행하였다. 그 결과 시트 백 및 헤드 레스트에서의 충돌 변위는 안전 기준에 부합되나 기존 모델 대비 대략 6.7% 차이를 보였다. 추가로 신규 모델의 러기지 리텐션 시뮬레이션의 적합성을 검증하기 위해 해당 시제품을 제작 후 수행된 러기지 리텐션 시험 결과로부터 시뮬레이션의 최대오차는 시트 백 위치에서 약 20.6%의 수준임을 확인하였다.
We propose a Semantic Social Networking Service (SSNS) using Smart TV to provide an enhanced object-centered social communication during watching TV. In the proposed semantic social communication service, it supports not only 1 to N interaction but also provides N to N interactions. Additionally, real-time social survey system supports the viewers to participate in a survey by synchronizing with broadcasting TV program. To ensure safe message sharing, a symmetric key based cryptography algorithm is employed to decrypt incoming and encrypt outgoing messages among participants.
As the vehicle technology grows rapidly in these days, the factors of practicable tests are increasing. However, it can be exposed to critical conditions to perform field tests with unverified implementations, since when error occurs while driving, directly leads to an unpredictable accident. For this reason, there are various simulators in the market to ensure the safety and provide various kinds of results, yet they are only targeting high value industries with their remarkable expense, which makes private enterprises challenging to purchase. Therefore, in this paper, autonomous vehicle simulation software based on an open-source project is proposed to provide an extensible platform with public license to perform tests in the virtual world.
The objective of this study was to improve the reliability of the endurance test for the powertrain system of military tracked vehicles. The measurement system that measures the driving duty applied to the powertrain system caused by mobility on roads consists of eight analog channels and two pulse channels, including the propeller shaft output torques for the left and right sides. The data obtained from this measurement system can be used to introduce a new technology that produces the output torque of a torque converter and that can be applied to analyze the revolution counting for the endurance and road mobility in the front unit and represent the relative fatigue damages analysis technique and its results according to the driven roads through a cumulative fatigue method.
Numerical analysis has been carried out to investigate thermal characteristics for hydraulic system. Overall performance of hydraulic system is largely influenced by oil flow field with heat transfer. Especially thermal characteristics for operating conditions with high oil temperature caused by heavy load and continuous operation are dominant. Oil temperature variation with time in the system is predicted for various flow conditions. Local fluid flow fields at the pipelines, valves, and oil pump in the hydraulic system are considered with thermodynamic and transport properties such as density and viscosity. These results in the study can be applied to the optimal design of hydraulic system.
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