Byung Jun Yoon

Abstract A boundary element method is developed to compute the electrostatic potential inside and around molecules in an electrolyte solution. A set of boundary integral equations are derived based on the integral formulations of the Poisson equation and the linearized Poisson‐Boltzmann equation. The boundary integral equations are then solved numerically after discretizing the molecular surface into a number of flat triangular elements. The method is applied to a spherical molecule for which an

Protein-surface interactions play a central part in many situations both in vivo and ex vivo, but it is not yet possible to predict the extent of interaction quantitatively as a function of protein structure and surface and solution properties. A method for doing so is presented for systems dominated by electrostatic interactions, based on a continuum model of the electrostatic potential in and around a protein molecule near a charged surface in an electrolyte solution. The governing equations a

AIM: The aim was to determine the efficacy of probiotics in restoring bowel function following ileostomy reversal in patients with rectal cancer. METHOD: This was a pilot, randomized, double-blind, placebo-controlled trial. The probiotic used in this study, Lactobacillus plantarum CJLP243, was derived from kimchi. Patients were randomly allocated to a probiotic or placebo group and medication was taken once daily from preoperative day 1 to day 21. Primary outcomes were the Memorial Sloan Ketteri

In this paper, we developed a versatile ionic field effect transistor (IFET) which has an ambipolar function for manipulating molecules regardless of their polarity and can be operated at a wide range of electrolytic concentrations (10(-5) M-1 M). The IFET has circular nanochannels radially covered by gate electrodes, called "all-around-gate", with an aluminum oxide (Al2O3) oxide layer of a near-zero surface charge. Experimental and numerical validations were conducted for characterizing the IFE

As an example of the free radical polymerization reactor we have conducted a theoretical study of the high pressure polyethylene tubular reactor with cooling from the jacket. The plug flow model including the axial dispersion is considered with as well as without the steady state assumption for the active intermediates. We observe that the axial dispersion has negligible effect on the reactor performance and that the steady slate assumption is quite reasonable. The performance of the reactor is

In this technical note, we report an experimental investigation of radial electroosmotic flow (EOF) as an effective means for controlling particle-deposition pattern inside an evaporating droplet, which has a potential application to biochemistry and analytical chemistry especially for sample preparation steps. Using the microelectrode, which consists of the circular electrode around the rim of droplet and the point electrode at the center of the droplet, we generate the radial electric field at

A simple, direct method is presented for the calculation of mobility functions for the translational and rotational velocities and stresslets of two equal-sized spheres in unbounded low-Reynolds-number flow when the ambient velocity field is a superposition of a uniform stream, a vorticity and a rate-of-strain field. Our numerical procedure furnishes accurate values for touching spheres and coefficients for the near-field asymptotic expansions. The singular behaviour of the mobility functions is

A two-dimensional (2D) nonisothermal monolith reactor model based upon intrinsic detailed reaction kinetics has been developed to simulate the performance of a commercial modern three-way catalytic converter. The model directly employed the reliable kinetic parameters estimated from the detailed reaction kinetics determined over the powder-type three-way catalysts (TWCs). The TWC activity of the monolith reactor containing each Pd and Pt/Rh/Ce catalyst with respect to the catalyst mileages, 4k m

A boundary element method is developed for computing the effective conductivity of a composite material containing periodic arrays of particles of arbitrary shape. Utilizing the periodic nature of the problem, steady conduction through a unit cell is analyzed by solving the integral representation of the Laplace equation. The accuracy of the method is validated by comparing the numerical results with analytic solutions for periodic arrays of spherical and spheroidal particles, in particular at h