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김봉수(Bongsoo Kim),김정엽(Jeongyeop Kim) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In the case of futuristic utility vehicles such as PBV, we are trying to implement various steering modes because there Subscriptsare situations where we have to travel in narrow spaces in the city. Therefore, it is necessary to make the rear steering system configuration different from the existing ones so that the tire can rotate as much as the steering angle of the front wheel at the same time as the steering angle of the front wheel is widened. In the case of the rear wheel, a steering angle of up to 10deg was realized in the currently mass-produced vehicle, but the minimum turning radius could not be greatly reduced. Therefore, if the same steering angle of 35deg as the front wheel can be implemented, the rotation center of the vehicles the Ackerman angle can be moved, and it is expected that the turning radius can be greatly reduced and various steering modes can be created.
Steer by Wire 시스템의 효율적 활용을 위한 최적화 구성 방안 연구
김봉수(Bongsoo Kim),김정엽(Jeongyeop Kim) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
The SBW system is a new technology related to steering and is expected to play an important role in changing the structure of future mobility. However, if a product that utilizes the current EPS system structure is applied, consumers will have to pay about 2.5 times more than before. The innovativeness must be evaluated by consumers through independent structure application and individual control of the front and rear wheel steering devices. The market will respond positively only if the technology that differentiates it from existing EPS is highlighted. The automobile market is still leveling up from machines driven by humans to machines driven by software. There is a price defense line that can be purchased in the market to overcome the current structures limitations, and we are still in the stage of breaking down that defense line only with luxury value. In order to move from automobiles to mobility, the perception must change from the concept of driving as a means of transportation to convenience and comfortable driving. Technological features that consumers can understand about new technologies should have an impact on improving the above awareness. Therefore, while adopting a structure specialized for SBW, it is necessary to jump up the function and expand the market through cost reduction.
박상준(Sangjun Park),오세욱(Sewook Oh),김정엽(Jeongyeop Kim) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
This study is about the steering system reverse input prevention concept that will be used in future mobility. Future steering systems are expanding the development of SBW-type steering devices without mechanical connections, and such systems generate reverse inputs regardless of the drivers will. An apparatus for limiting such an inverse input has various system structures. Based on this study, it will be the best choice to construct a system that controls reverse input using gear efficiency, solenoids, clutches, etc.
Steer-by-Wire용 반력 장치 컨셉에 관한 연구
박상준(Sangjun Park),정재우(Jaewoo Jung),김정엽(Jeongyeop Kim) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
This study is about the decelerator concept of SFA among Steer by Wire (StBW) technology, which is a core technology of future autonomous driving. Many companies are researching autonomous driving technology, but there are many problems. It will take a lot of time for full autonomous driving to be released. SFA is essential before fully autonomous driving that does not require a steering wheel. There are four commonly used decelerators. We present appropriate properties for package size, motor output, friction, and torque flux for each concept to be used as an SFA in near-future mobility. Research on this will be the most basic consideration when choosing SFA in the near future StBW technology.
미래 모빌리티에서 독립조향(Wheel Independent Steering)에 대한 연구
박상준(Sangjun Park),정재우(Jaewoo Jung),김정엽(Jeongyeop Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
This study is about the concept and mounting location of a four-wheel independent steering system (4Ws) in future mobility. The necessity and market trends of 4WS in the growing pbv market were studied. Currently, 4ws products are not being produced, but many companies are researching and developing them. Independent steering (4WS) can use a special mode different from 4wheel steering (RWS). The special driving modes of independent steering in Pbv have special value in the urban mobility industry. We presented the chassis structure and specifications suitable for 4ws and obtained 12 4WS concepts that fit each requirement. In the future, in PBV using autonomous driving, an independent steering system for vehicle operation plan and driving mode will be developed. It is expected to be commercialized in the near future and occupy an important part of future mobility steering devices.
김세오,김정엽,현기오 영산대학교 2006 영산논총 Vol.16 No.-
Watermarking is embedding a digital signal called as watermark into images to insist the ownership. The comparison is studied in this paper for the conventional methods of MPEG video watermarking and we discuss the enhancement of that improvement plan. Watermarking methods for the I-frame that doesn't have motion vector are using DCT-based spread spectrum and DWT-based RSA(Rivest, Shamir, Aldeman) public key of the coded target. Then, Watermarking methods for the P and B-frame that have motion vector are using DWT and HVS(Human Visual System) and motion vector. These paper show that the conventional methods have a distortion, blocking effect and robustness problem. We suggest the combination of RSA public key encryption and DWT-based video watermarking algorithm.