• Journal of the Korean Society for Precision Engineering
• /
• v.16 no.2 s.95
• /
• pp.95-103
• /
• 1999

수중운동체가 수중에서 진행할 때 외부 파도에 의한 불확실한 부하 저항을 받으므로 이에 대응하는 핀(조타) 구동부의 제어 문제를 고려한다. 본 논문에서 제시하는 제어기는 본체로부터의 지정 각도를 부여 받으면 이에 부응하여 핀의 각도와 각속도를 이용하여 제어기의 알고리즘을 구축하여 지정된 경로를 추적하게 한다. 또한 핀의 각속도 정보의 이용이 부득이 어려운 상황에 대처하기 위하여 핀의 각도만을 이용한 출력제어기나 추정기를 설계하여 주위 환경의 불확실성을 극복할 수 있는 제어기를 제안한다. DC서보 모터로 구성괸 핀 구동부에 대해 실제 데이터를 사용하여 제안된 제어기의 성능을 시뮬레이션을 통하여 검증한다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2023.11a
• /
• pp.1171-1172
• /
• 2023

자율주행 기술에서 스테레오 비전과 End-to-End Driving은 많이 사용되는 기술이며 본 연구에서는 이를 신호등 인식과 주행에 적용하였다. 신호등 인식은 좌우 카메라로부터 적색 원을 인식한 후 스테레오 비전을 통해 신호등과의 거리를 추정한다. 주행 시스템은 End-to-End Learning 기반으로 이루어지며, 출력값인 가변저항을 조향각으로 변환하여 제어할 수 있다. 또한 감마 보정을 통한 데이터 증강을 통해 빛에 대해 민감하지 않게 모델을 학습하였다. 추후 신호등 인식 시 HSV 필터가 빛에 민감한 점과 주행 시 가변저항 값이 일정하지 않은 점이 해결된다면 더욱 안정적인 시스템을 구축할 수 있을 것으로 기대된다.

• Journal of the Korean Wood Science and Technology
• /
• v.39 no.1
• /
• pp.8-14
• /
• 2011

Japanese larch glulam was used as structural members to develop a modern engineered wood jointing system using traditional post and beam structure. For the connections comprised of traditional joining and drift-pins, structural members are processed at a pre-cut factory. As a basic study to examine and increase the whole shear performance of portal frame, pin withdrawal test and moment resistance tests were conducted on each connection. The post and beam members with specified connectors showed good bearing performance in the wood members' joining system, column-base and beam-end. Moment rigidity was a bit better in a joint with higher slenderness ratio of drift-pin, but moment resistance performances, yield moment and maximum moment, were excellent in smaller one.

• Journal of the Microelectronics and Packaging Society
• /
• v.15 no.4
• /
• pp.9-15
• /
• 2008

Microstructure and contact resistance of the Au-Sn solder joints were characterized after flip-chip bonding of the Au/Sn bumps processed by successive electrodeposition of Au and Sn. Microstructure of the Au-Sn solder joints, formed by flip-chip bonding at $285^{\circ}C$ for 30 sec, was composed of the $Au_5Sn$+AuSn lamellar structure. The interlamellar spacing of the $Au_5Sn$+AuSn structure increased by reflowing at $310^{\circ}C$ for 3 min after flip-chip bonding. While the Au-Sn solder joints formed by flip-chip bonding at $285^{\circ}C$ for 30 sec exhibited an average contact resistance of 15.6 $m{\Omega}$/bump, the Au-Sn solder joints reflowed at $310^{\circ}C$ for 3 min after flip-chip bonding possessed an average contact resistance of 15.0 $m{\Omega}$/bump.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.35 no.12
• /
• pp.1627-1633
• /
• 2011

Injection molds are generally fabricated by assembling a number of plates in which the core and cavity components are assembled. This assembled structure has a number of contact interfaces where the heat transfer characteristics are affected by thermal contact resistance. In previous studies, numerical approaches were investigated to predict the effect of thermal contact resistance on the temperature distribution of injection molds. In this study, thermal-fluid coupled numerical analyses are performed to take into account the thermal contact effect on the numerical evaluation of the mold filling characteristics. Comparisons with experimental results show that the proposed coupled analysis provides more reliable results than the conventional analyses in predicting the mold filling characteristics by taking into account the effect of thermal contact resistance inside the injection mold assembly.

• Journal of Digital Convergence
• /
• v.16 no.1
• /
• pp.103-116
• /
• 2018

In this study, we investigated the influence of smart factory's implementing energy management system on innovation resistance and work performance. We surveyed and analyzed 211 employees of system construction companies in the metropolitan area. In order to increase the introduction performance through diffusion of the energy management system, it is found that it is important to support the organizational-level management strategy to reduce the user's resistance to innovation. In conclusion, this study has implications for positively leading to the efficiency and management performance of the manufacturing process of the manufacturing enterprises, and it is necessary to follow - up studies considering the characteristics of the energy management system and the expansion of the research scope in the future.

• The Journal of the Korea Contents Association
• /
• v.21 no.10
• /
• pp.409-421
• /
• 2021

The purpose of this study is to verify the effects of innovative technology characteristics of beauty care remote-manufacturing system on resistance and acceptance intentions to innovative technology in the era of the Fourth Industrial Revolution. A survey of 567 female consumers in their 20s and older was conducted. The collected survey data were analyzed for hypotheses verification through structural equation model analysis. First, the perceived usefulness and perceived ease to use of beauty care remote-manufacturing systems have negative effects on resistance to innovative technology. Second, resistance to beauty care remote-manufacturing systems has been shown to negatively affect acceptance intention. Third, perceived risk to beauty care remote-manufacturing systems have been shown to negatively affect acceptance intention. Through this study, it can be found that the significance of this study in that it derived factors that affect consumer' resistance and acceptance of innovative technologies and presented new trends and directions of the cosmetics manufacturing industry.

• Journal of the Microelectronics and Packaging Society
• /
• v.30 no.2
• /
• pp.60-64
• /
• 2023

In this study, the electrical contact resistance characteristics between graphene and metals, which is one of important factors for the performance of graphene-based devices, were compared. High-quality graphene was synthesized by chemical vapor deposition (CVD) method, and Al, Cu, Ni, and Ti as electrode materials were deposited on the graphene surface with equal thickness of 50 nm. The contact resistances of graphene transferred to SiO₂/Si substrates and metals were measured by the transfer length method (TLM), and the average contact resistances of Al, Cu, Ni, and Ti were found to be 345 Ω, 553 Ω, 110 Ω, and 174 Ω, respectively. It was found that Ni and Ti, which form chemical bonds with graphene, have relatively lower contact resistances compared to Al and Cu, which have physical adsorption properties. The results of this study on the electrical properties between graphene and metals are expected to contribute to the realization of high-performance graphene-based devices including electronics, optoelectronic devices, and sensors by forming low contact resistance with electrodes.

• Proceedings of the Korea Society for Industrial Systems Conference
• /
• 1997.11a
• /
• pp.259-287
• /
• 1997

오늘날 기업들은 정보기술의 빠른 발전에도 불구하고 관련 비용의 감소 대신 오히려 증가를 경험하고 있으며, 수용과 사용보다 정보시스템 오용과 거부가 더 흔하게 발생한다는 파라독스에 직면하고 있다. 이 때문에 정보시스템의 평가를 위한 많은 성공척도들이 학계 및 실무에서 제안되어 왔다. 그러나 기존의 성공척도들은 사용자 내면의 부정적 심리를 정확히 반영하지 못한다는 문제점을 지니고 있다. 따라서 본 연구에서는 기존의 성공척도와 상호보완적으로 쓰일 수 있는 새로운 성공척도로서 사용자 저항이라는 개념을 제시한다. 본 연구는 사용자 저항의 개념을 제시하고 저항의 영향요인들을 검증하며, 사용자 만족도 및 시스템 사용도와의 관련성을 확인하는데 목적을 두었다. 실증분석 결과 사용자 저항은 적극적 저항과 소극적 저항이라 부를 수 있는 두 차원으로 구성되었으며, 지각된 복잡성, 지각된 위험성, 지각된 유용성, 컴퓨터에 대한 자기효력이 정보시스템에 대한 사용자의 저항에 영향을 미치는 요인으로 나타났다. 그리고 저항의 영향요인과 시스템 사용도 및 사용자 만족도의 영향요인들은 일부 다른 것으로 확인되었다.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.13 no.6
• /
• pp.1301-1309
• /
• 1989

본 연구의 목적은 Lumley의 저항감소 모델을 사용하여 여러 부하도하에서 부유유동의 유동 특성을 관찰하는 것으로, 특히 저항감소가 일어날 때와 일어나지 않을 때의 유동특성을 알아 보고자 한다.