Sungkyunkwan University · Biochemistry, Genetics and Molecular Biology
Professor Jinsung Park's research lab specializes in interdisciplinary studies at the intersection of nanoscale characterization, molecular interactions, and nonlinear dynamics. The lab focuses on developing advanced scanning probe microscopy techniques—particularly Kelvin probe force microscopy (KPFM)—to investigate surface potential and electronic properties at the single-molecule and nanomaterial level. Key research directions include the detection of biomolecular interactions with high sensitivity, the analysis of charge states in doped nanomaterials such as polyaniline, and the experimental observation of complex spatiotemporal patterns in reaction-diffusion systems, including spiral waves mediated by line defects. The lab also contributes to theoretical mathematical physics, particularly in spectral invariants and adiabatic limits of differential operators.
Figures are computed from collected data and may differ slightly.
This paper presents the design and analysis of low flicker-noise RF mixers in a 0.18-mum CMOS process for C-band direct-conversion receivers. The low flicker-noise mixers are implemented by incorporating a double-balanced Gilbert-type configuration, the RF leakageless current bleeding technique, and the resonating technique for the tail capacitance. First, a double-balanced Gilbert-type mixer using the current bleeding technique has been fabricated and measured for lowering flicker corner freque
We report the scanning probe microscope (SPM)-based single-molecule recognition of biomolecular interactions between protein kinase and small ligands (i.e., ATP and Imatinib). In general, it is difficult to sense and detect the small ligands bound to protein kinase (at single-molecule resolution) using a conventional atomic force microscope (AFM) due to the limited resolution of conventional AFM for detecting the miniscule changes in molecular size driven by ligand binding. In this study, we hav
Recent numerical simulations on two-dimensional model reaction-diffusion systems have revealed unusual spiral waves with complex oscillations and turbulent patterns, both mediated by ``line defects.'' Here we report the observation of such patterns in a laboratory experiment for the first time; complex spiral waves with period-2 and period-3 and turbulent patterns filled with a tangle of line defects are observed and their spatiotemporal dynamics are elucidated by line defects. Since line defect
The instability of a period-1 spiral wave resulting in a period-2 spiral wave with a line defect is investigated for the first time in a laboratory system. At the very onset the transition proceeds by an emergence of a spiraling line defect, "breathing" intermittently while retaining its symmetry of a period-1 spiral wave. With a further change in a control parameter, the line defect undergoes a meandering transition producing a compound tip trajectory, following a dynamic shape transition. The
The work function of polyaniline nanoparticles in the emeraldine base state was determined by Kelvin probe force microscopy to be ~270 meV higher than that of similar nanoparticles in the emeraldine salt state. Normal tapping mode atomic force microscopy could not be used to distinguish between the particles due to their similar morphologies and sizes. Moreover, other potential measurement systems, such as using zeta potentials, were not suitable for the measurement of surface charges of doped n
ABSTRACT We discuss the decomposition of the ζ-determinant of the square of the Dirac operator into the contributions coming from the different parts of the manifold. The result was announced in the Note Ref. [16]. The proof sketched in the Note was based on results of Brüning and Lesch (see Ref. [4]). In the meantime we have found another proof, more direct and elementary, and closer to the spirit of the original papers which initiated the study of the adiabatic decomposition of the spectral in
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