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Seungho Park,Yoojin Lee 한국디자인학회 2010 한국디자인학회 학술발표대회 논문집 Vol.2010 No.10
Development of digital technology has served as the foundation for the development of interfaces of numerous instruments working in daily life of people. Interface can be defined as a communication channel among people and system, and a successfully designed interface promotes the convenience and efficiency of instrument use by users. To design successful interface, understanding of the elements of circumstances is essential. This study has the purpose to propose new interface for elevator. As concentration of population in the city intensifies, the residential area of people continues to extend vertically, and in the midst of such extension lies elevator. Being a infrastructural system that enables urbanization, elevator requires interface that promotes user convenience, facilitates new experiences and extends market through differentiation. This study extended the range of provided information by providing information on real time operation status like stopping reservation status, the number of persons that can board, and door opening status etc. In addition, the study extract system problems and deduce improvement plan by releasing the system in public in actual space beyond the level of virtual research.
Molecular Dynamics Simulation for Size-Dependent Properties and Various Nanoscale Phenomena
Seungho Park,Joon Sik Lee,Young Ki Choi,Sung San Cho,Jung Soo Kim 한국정밀공학회 2004 International Journal of Precision Engineering and Vol.5 No.4
Stimulated by novel phenomena observed in molecular aggregates, recent developments in engineering fields of microscopic scales are creating tremendous opportunities for future nanotechnology-based applications. Investigation in the field involves sub-nanosecond or sub-micrometer interactions between extremely small systems, but researches to date in these physical extremes have been quite limited. Here, we shed light on some of nanoscale phenomena using molecular dynamics simulation: visualization of various phenomena of nanoscales and exploration of size-dependent mechanical properties.
Seungho Park 대한설비공학회 2002 International Journal Of Air-Conditioning and Refr Vol.10 No.1
Effects of temperature coefficients for dielectric constants on transient reflectances and thermal responses have been investigated for a metal(gold) thin-film during ultrashort pulse laser heating. Heating processes are simulated using the conventional conduction model(parabolic one-step, POS), the parabolic two-step model(PTS), the hyperbolic two-step model (HTS). Results from the HTS model are very similar to those from the PTS model, since the laser heating time in this study is considerably greater than the electron relaxation time. PTS and HTS models, however, result in completely different temperature profiles from those obtained by the POS model due to slow electron-lattice interactions compared to laser pulse duration. Transient reflectances are directly estimated from the linear relationship between electron temperature and complex dielectric constants, while conventional approaches assume that the change in reflectances is proportional to that in temperature. Reflectances at the front surface vary considerably for various dielectric constants, while those at the rear surface remain unchanged relatively.
Park, Kwi Woo,Chae, Jeong Geun,Song, Se Phil,Son, Seok Bo,Choi, Seungho,Park, Chansik The Institute of Positioning 2017 Journal of Positioning, Navigation, and Timing Vol.6 No.1
In this study, to design a multi-GNSS receiver using single RF front-end, the receiving performances for various frequency plans were evaluated. For the fair evaluation and comparison of different frequency plans, the same signal needs to be received at the same time. For this purpose, two synchronized RF front-ends were configured using USRP X310, and PC-based software was implemented so that the quality of the digital IF signal received at each front-end could be evaluated. The software consisted of USRP control, signal reception, signal acquisition, signal tracking, and C/N0 estimation function. Using the implemented software and USRP-based hardware, the signal receiving performances for various frequency plans, such as the signal attenuation status, overlapping of different systems, and the use of imaginary or real signal, were evaluated based on the C/N0 value. The results of the receiving performance measurement for the various frequency plans suggested in this study would be useful reference data for the design of a multi-GNSS receiver in the future.
Cantilever Dynamic Vibration Absorber for Reducing Optical Disk Drive Vibration
Seungho Lim,Kyungtae Kim,Ungrae Cho,No-Cheol Park,Young-Pil Park,Kyoung-Su Park,Wook-Young Soh IEEE 2009 IEEE transactions on magnetics Vol.45 No.5
<P>This research explores the design of a dynamic vibration absorber (DVA) using a cantilever beam with tip mass. Compared to a conventional DVA using a rubber bobbin, the proposed DVA isolates vibrations more effectively due to the low damping properties of its structure, which are the principal reason for its excellent anti-vibration performance near the anti-resonance frequency. This low damping decreases the harmonic response at the rotational frequency of the disk. To design the proposed DVA, the dynamic characteristics of the optical disk drive were represented with lumped parameter and finite element models. The dimensions of the beam were tuned to reduce the vibration in multiple axes based on this model. Tolerance analysis were performed so the drive would be robust against normal dimension variance due to the manufacturing process, and the variation in the dynamic characteristics with respect to the pickup position was investigated. The anti-vibration performance of the DVA was also measured experimentally.</P>