• 자동차안전학회지
• /
• 제15권1호
• /
• pp.7-15
• /
• 2023

The purpose of this study is to predict the dynamic behavior of clamshell hood system on the harsh road driving condition, and secure the safety and durability performance of the system. The equation of motion of hood system is derived and the numerical analysis is implemented to obtain the lateral movement of the hood system. Also, the actual Belgian road test results are correlated to the predicted ones, and confirm the reliability of the system. Then, the parameter study is conducted to figure out the sensitive factors to affect the dynamic behavior, and the engineering design guide to make the system robust to confine the minimum friction force generated from hood latch and maximum hood weight is suggested from this research.

• 한국소프트웨어감정평가학회 논문지
• /
• 제17권2호
• /
• pp.117-124
• /
• 2021

가축의 행동 분석은 가축 건강관리와 농업 생산성 증대에 큰 영향을 미치는 요소이다. 그러나 가축의 행동 분석을 위해 도입되는 대부분의 디지털 기기들은 원시 데이터를 제공하지 않으며 분석 결과 또한 제한적으로 제공한다. 이러한 폐쇄적인 시스템은 첨단 IT 기술의 도입에 필수불가결한 데이터 통합과 빅데이터 구축을 더욱 어렵게 한다. 이에 저비용으로 손쉽게 사용할 수 있는 농장 규모의 데이터 수집 장치 보급이 필요하다. 본 연구는 가축의 행동 분석을 위한 데이터 수집 시스템을 제시한다. 이 시스템은 무선으로 동작하는 다수의 초소형 컴퓨팅 유닛으로 구성되어 있으며 이를 통해 가축의 체온과 가속도 데이터, 위치 정보, 축사 환경 데이터를 수집한다. 또한 본 연구에서는 수집된 가속도 데이터를 바탕으로 가축의 행동을 추정하는 알고리즘을 제시한다. 실험을 위해 경기도 이천의 한우 농가에 시스템을 구축하고 20두의 한우에 대해 데이터를 수집하였으며 이를 토대로 실증 및 분석 결과를 제시하였다.

• International Journal of Advanced Culture Technology
• /
• 제10권3호
• /
• pp.313-324
• /
• 2022

This study aims to quantitatively understand the influence of changes in functional cosmetics purchasing sentiment on purchasing behavior and purchase satisfaction after the COVID-19 pandemic and present empirical analysis results regarding the rapidly changing cosmetics consumption market. This study empirically analyzed the structural relationship between non-face-to-face service purchase behavior, functional cosmetics purchase behavior, and functional cosmetics purchase satisfaction to predict purchase behavior of functional cosmetics by psychological characteristics after COVID-19. The collected data were analyzed using SPSS 22.0 (Statistical Package for Social Science) program and Amos 21.0, and correlation analysis was performed to understand the relationship between consumers' purchasing behaviors of functional cosmetics according to their perception of risk of COVID-19 carried out.Summarizing the results of this study, it was found that the higher the anxiety after the corona outbreak, the higher the non-face-to-face service purchase behavior and the functional cosmetics purchase behavior. It was found that purchase satisfaction increased when purchasing behavior of functional cosmetics increased, but purchase satisfaction decreased as anxiety increased after the outbreak of Corona.In this study, a sample of 1452 people were used as research data, and the theoretical implications for the development of functional cosmetics were presented by confirming the effect of changes in non-face-to-face service purchase behavior according to psychological characteristics after Corona 19 on consumer satisfaction.

• Earthquakes and Structures
• /
• 제16권1호
• /
• pp.83-96
• /
• 2019

The seismic behavior of PRC coupling beam-hybrid coupled shear wall system is analyzed by using the finite element software ABAQUS. The stress distribution of steel plate, reinforcing bar in coupling beam, reinforcing bar in slab and concrete is investigated. Meanwhile, the plastic hinges developing law of this hybrid coupled shear wall system is also studied. Further, the effect of coupling ratio, section dimensions of coupling beam, aspect ratio of single shear wall, total height of structure and the role of slab on the seismic behavior of the new structural system. A fitting formula of plate characteristic values for PRC coupling beams based on different displacement requirements is proposed through the experimental date regression analysis of PRC coupling beams at home and abroad. The seismic behavior control method for PRC coupling beam-hybrid coupled shear wall system is proposed based on the continuous connection method and through controlling the coupling ratio, the roof displacement, story drift angle of hybrid coupled shear wall system, displacement ductility of coupling beam.

• Architectural research
• /
• 제9권1호
• /
• pp.39-45
• /
• 2007

The static behavior of continuous system is described by the elastic curve method or is approximately analyzed by a finite element method to be modeled as a discrete system. If a continuous system is constrained by linear constraints which restrict its static behavior, its behavior can be approximately described by the finite element method. It is not easy to describe the constrained behavior by continuous coordinate system. Starting from the generalized inverse method provided by Eun, Lee and Chung, this study is to expand the equation to the continuous systems, to perform the structural analysis of the beam under a uniform loading with interior spring supports, and to investigate the validity of the proposed method through applications.

• Journal of Mechanical Science and Technology
• /
• 제20권7호
• /
• pp.941-949
• /
• 2006

Nonlinear behavior analysis was used to verify whether a one-way clutch is effective for reducing the torsional vibration of a paired spur gear system under periodic excitation. The dynamic responses were studied over a wide frequency range by speed sweeping to check the nonlinear behavior using numerical integration. The gear system with a one-way clutch showed typical nonlinear behavior. The oscillating component of the dynamic transmission error was reduced over the entire frequency range compared to a system without a one-way clutch. The one-way clutch also eliminated unsteady continuous jump phenomena over multiple solution bands, and prevented double-side contact, even with very small backlash. Installing a one-way clutch on both sides of the gear system was more effective at mitigating the negative effects of external periodic excitation and various parameter changes than a conventional gear system without a one-way clutch.

• 산업경영시스템학회지
• /
• 제13권22호
• /
• pp.71-78
• /
• 1990

Some problems to assess the safety of automated man-machine system are studied in many ways. The difficulty occurred in this system is the vagueness of human behavior. Fuzzy set theory is used to assess the human behavior in safety analysis. The unsafe behavior listed top 10 in accident statistics would be explained as the factors of human vagueness. Three cases are considered, which consist of man-machine system as man-man, man-machine, machine-machine types. For the design of safe task, using characteristics of work performance, each motion cycle time is required to know the rate of learning. Approach of human behavior to the standard motion means more safe motion. It is important to design the works as to minimize the time performance to the standard motion's, which utilize the control of risk potential with easy. In that process, use of fuzzy set theory is appropriate to analyze the human behavior to identify its vagueness.

• Computers and Concrete
• /
• 제6권3호
• /
• pp.187-202
• /
• 2009

This paper focuses on the flexural behavior of RC beams externally strengthened with Carbon Fiber Reinforced Polymers (CFRP) fabric. A non-linear finite element (FE) analysis strategy is proposed to support the beam flexural behavior experimental analysis. A development system (QUEBRA2D/FEMOOP programs) has been used to accomplish the numerical simulation. Appropriate constitutive models for concrete, rebars, CFRP and bond-slip interfaces have been implemented and adjusted to represent the composite system behavior. Interface and truss finite elements have been implemented (discrete and embedded approaches) for the numerical representation of rebars, interfaces and composites.

• 스마트미디어저널
• /
• 제8권4호
• /
• pp.85-90
• /
• 2019

초광대역 레이더는 수 GHz대의 주파수 대역을 사용하는 고속무선통신 기술로 실내 무선 측위기술로 각광받고 있다. 한편, 박물관 및 전시회 등의 기관에서는 방문객 실시간 위치뿐만 아니라, 관람자의 이동경로 및 체류시간 정보 또한 관람 행태 분석을 위해 필요로 한다. 본 논문에서는 초광대역 레이더를 이용한 실시간 위치 추적 기술을 통해 박물관 방문객의 관람 행태를 분석하는 시스템을 구축 사례를 소개한다. 개발 시스템을 국립중앙박물관 신라관에 설치하여, 22개의 상용 초광대역 레이더로 부터 실시간 측위 정보 수신하고, 이를 통해 관람자 조건별 이동경로 및 전시 대상별 체류시간을 분석할 수 있는 환경을 구축하였다.

• 한국자동차공학회논문집
• /
• 제1권2호
• /
• pp.42-48
• /
• 1993

In this paper, dynamic collapse behavior of the rectangular tube under impact loading is anlayzed using nonlinear finite element method of shell element. In case of shell element formulation using corotational element coordinates system, dynamic collapse behavior is analyzed without initial imperfection, and with initial imperfection. This paper reveals that the collapse of a rectangular tue without initial imperfection is caused by an error of transformation of the corotational coordinates system.