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윤희선,정진헌,Yoon, Heesun,Chung, Jeanhun 한국인터넷방송통신학회 2022 한국인터넷방송통신학회 논문지 Vol.22 No.5
With the rapid development of information technology, Metaverse and Non-Fungible Token (hereinafter referred to as NFT) technology will not only create new supply and demand markets for digital art creators, but also for existing art writers. As interest in and trading of virtual assets and coins increases, so does the demand for digital art trading in the NFT market. This study examines the theoretical content of NFTs, blockchains, and Metaverse, and analyzes various expressions of NFT art that are currently popular. As the case study, 100 projects were selected and analyzed in the overall OpenSea ranking, which included 2D graphics, 3D graphics and motion graphics works. Then, from the perspective of creators, the graphic styles of NFT digital art are divided into 4 types: 2D graphics, 3D graphics, 2D dynamic graphics, 3D dynamic graphics, and analyzed and studied. It is hoped that in the future, this study can suggest the direction of creating graphic styles to digital art NFT creators.
모바일 로봇 네비게이션을 위한 Lock-in Amplifier 방식의 레이저 거리 측정기
윤희선(Heesun Yoon),박기환(Kyihwan Park) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Map building is the most important thing for the mobile robots navigation. It requires specific vision system such as CCD camera, range finding system, and many other things. Laser range finder has highly collimated beams can be obtained easily, thus achieving lateral resolution, and short wavelengths involved cause the light to be backscattered, rather than reflected by the target. For the signal processing, the Lock-in amplifier system is addressed in this paper. We used a diffused reflected beam to detect phase shift in this system. But this beam is minuteness signal so it can be easily buried in nose. Lock-in amplifier is used to measure the amplitude and phase of signals which are buried in noise.
Seongrae Lim(임성래),Heesun Yoon(윤희선),Gahee Kim(김가희),Byunghwan Um(엄병환) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
Nowadays, the need for alternative energy source has grown due to global climate issues. Among various renewable energy sources, biomass-especially herbaceous biomass is considered to be a reasonable solution for domestic situation. In this work, Korean native kenaf was treated with hydrothermal carbonization (HTC) to produce solid biofuel called hydrochar. To acquire enhanced property of hydrochar, HTC was performed under different solid-liquid ratio, temperature and time. Elemental, physical and chemical properties of hydrochar samples were analyzed for in-depth comparison of its fuel characteristics. By searching optimal of key parameter of producing kenaf hydrochar through current study, further utilization of domestic biomass fuel might be available.