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문영광(Youngkwang Moon),문혁균(Hyeokgyun Moon),장준혁(Junhyuck Chang),이정헌(Jung Heon Lee),이진기(Jinkee Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Paper-based detection devices are mostly detection devices made based on hydrophilic cellulose or nitrocellulose fibers. A typical example is a lateral flow strip. Due to the disadvantage that the commercialized paper-based detection device has a low detection limit, a PCR (polymerase chain reaction) process that replicates and amplifies the nucleic acid is essential when the amount of nucleic acid is small in the sample. By solving the low detection limit, which is a problem with existing paper-based detection devices, we wanted to fabricate a detection device that can perform on-site diagnosis quickly without the PCR process. A hydrophobic fiber pattern was made in paper in a very simple way, and the detection limit was dramatically improved by concentrating a fluorescent molecular beacon in the pattern, thereby producing a paper-based detection device that can omit the PCR process.
문한빛,나원상,정영광 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.6
A practical homing guidance scheme is newly proposed in order to meet the impact angle and terminal acceleration constraints, simultaneously. Provided that the homing guidance loop is modeled as a linear time-varying differential equation by approximating the missile dynamics as a first-order system, its closed-form solution is expressed as a linear combination of hypergeometric functions. It implies that the instability of the homing guidance loop is mainly due to the missile dynamic lags and, furthermore, the non-diverging homing trajectory could be obtained by introducing the additional biased acceleration command as a rational function of time-to-go. These inspirational observations motivate us to formulate an impact angle control problem as designing an appropriate biased term which generates a non-diverging time-to-go polynomial homing trajectory for given terminal constraints. The resultant guidance command has a similar form used in conventional guidance laws but its feedback gains vary with time-to-go. This similarity means that, during the flight, the proposed guidance law adaptively embraces existing guidance laws derived by intentionally ignoring the effect of missile dynamic lags. Through the numerical simulations, the performance of the proposed guidance scheme is evaluated.