Showing papers by "Simon S. Park published in 2015"
TL;DR: From a series of proof-of-concept and clinical experiments, the developed PAFI biosensing system provided robust signal production and enhancement, as well as an excellent selectivity and sensitivity for influenza viruses.
85 citations
TL;DR: In this study, IA-CNTs were utilized to detect humidity, and it was established that the humidity detection mechanism had D2O-sensing capabilities.
Abstract: Functionalized carbon nanotubes (f-CNTs), particularly CNTs decorated with nanoparticles (NPs), are of great interest because of their synergic effects, such as surface-enhanced Raman scattering, plasmonic resonance energy transfer, magnetoplasmonic, magnetoelectric, and magnetooptical effects. In general, research has focused on a single type of NP, such as a metal or metal oxide, that has been modified on a CNT surface. In this study, however, a new strategy is introduced for the decoration of two different NP types on CNTs. In order to improve the functionality of modified CNTs, we successfully prepared binary NP-decorated CNTs, namely, iron oxide/gold (Au) NP-decorated CNTs (IA-CNTs), which were created through two simple reactions in deionized water, without high temperature, high pressure, or harsh reducing agents. The physicochemical properties of IA-CNTs were characterized by ultraviolet/visible spectroscopy, Fourier transform infrared spectroscopy, a superconducting quantum interference device, s...
46 citations
TL;DR: In this article, the authors investigated the feasibility of shifting the natural frequency of a cantilever boring bar based on semi-active fluid control, where the mass at the end of a boring bar was modulated to tune its natural frequency by adjusting the level of fluid in a reservoir.
16 citations
TL;DR: In this paper, the effect of asymmetrically shaped dimpled surfaces on an aluminum workpiece was investigated using the inclined micro-flat end milling process, and the results demonstrated a sliding direction dependent response, in terms of measured friction coefficients.
16 citations
TL;DR: In this article, carbon nanotube (CNT) nanocomposites with a polystyrene thermoplastic matrix were injection molded and the high shear stress exerted during the injection process partially enabled the alignment of the CNTs in the flow direction.
Abstract: Carbon nanotube (CNT) nanocomposites with a polystyrene thermoplastic matrix were injection molded and the high shear stress exerted during the injection process partially enabled the alignment of the CNTs in the flow direction. Nanocomposites with different CNT loadings and degrees of alignment were produced, and their thermal conductivities were measured based on ASTM D5470. The results were compared with compression molded samples featuring random alignments of CNTs. The results showed that the injection molded samples possessed anisotropic thermal conductivities, due to the partial alignment of the CNTs in the flow direction. The effective medium approach was used to analytically estimate the thermal conductivity of the molded samples. Good agreement was observed between the experimental and analytically simulated results in lower CNT concentrations (less than 5 wt% of CNT). Using transmission electron microscopy pictures taken of the nanocomposites, the alignment of CNTs in the thermoplastic matrix were modeled; and their thermal conductivities were simulated using the finite element method. Good agreement was observed between the experiments and simulated results. POLYM. ENG. SCI., 55:753–762, 2015. © 2014 Society of Plastics Engineers
14 citations
TL;DR: In this paper, a chaotic mixing system was developed and optimized in order to overcome challenges associated with mixing polymers with high aspect ratio nano-particulates, and two cylindrical rotors were used to uniformly mix multi-walled carbon nanotubes (MWCNTs) with a thermoplastic.
Abstract: A chaotic mixer is developed and optimized in order to overcome challenges associated with mixing polymers with high aspect ratio nano-particulates. The chaotic mixing system utilizes two cylindrical rotors to uniformly mix multi-walled carbon nanotubes (MWCNTs) with a thermoplastic. Results of the electrical conductivity and electromagnetic interference (EMI) shielding effectiveness of the chaotic mixed nanocomposites were higher than ones mixed via a commercial HAAKE mixer. MWCNTs’ length was investigated and it was observed that the MWCNTs in chaotic mixed nanocomposites are longer compared to HAAKE mixer. To investigate the effects of MWCNTs’ length on the electrical properties, a 3D electrical model based on random walk method was developed and examined. Obtained results suggest that the chaotic mixer has a higher potential for mixing nano particulates into thermoplastics without breaking the nanotubes and improved electrical properties, compared to other types of melt mixing techniques.
14 citations
TL;DR: In this article, a method for the identification of multiple joints in structures using the inverse receptance coupling method is proposed, which enables the determination of the joint properties by finding the differences between the measured receptances of the assembled structures and the simulated receptances obtained from rigidly coupled substructures.
Abstract: A lot of effort has been put into accurately modelling virtual prototypes prior to physical building of structures, in order to minimize cost and time while improving performance. However, there are often significant discrepancies between the dynamics of virtual prototypes and actual physical structures, which are mainly caused by improper joint dynamics modelling and assumptions. To overcome these challenges, we propose a method for the identification of multiple joints in structures using the inverse receptance coupling method. This method enables the determination of the joint properties by finding the differences between the measured receptances of the assembled structures and the simulated receptances obtained from rigidly coupled substructures. The receptances are obtained either through the finite element model or experimental modal measurements. The only measurements required in the proposed identification method are measurements on the translational degrees of freedom of the substructures and ass...
13 citations
01 Jan 2015
TL;DR: This article proposes a novel cuff-based microactuator for automatic blood extraction using Shape Memory Alloy (SMA) technology to provide an actuator solution for an electronic mosquito-like device, e-Mosquito, which enhances blood glucose measurement to off the potential to significantly improve both the quality of life for diabetic patients and their disease management.
Abstract: This article proposes a novel cuff-based microactuator for automatic blood extraction using Shape Memory Alloy (SMA) technology. It aims to provide an actuator solution for an electronic mosquito-like device, e-Mosquito, which enhances blood glucose measurement to off the potential to significantly improve both the quality of life for diabetic patients and their disease management. Fabrication and assembly methods of the microactuator prototype are discussed. The 6-mm thick microactuator prototype underwent mechanical tests in a laboratory environment to characterize its penetration force and depth, which are the major factors facilitating skin penetration and blood extraction. Testing results demonstrated that this actuator can produce a maximum penetration force of 160gf and a maximum displacement depth of 2.45mm, which both exceed the minimum force and depth requirements for blood capillary-reaching skin penetration in humans. Five actuator prototypes were assembled and integrated to a cuff wrist strap. A pilot human study was performed to test the blood extraction capabilities of the device. All five actuators successfully penetrated the skin and drew whole blood samples appearing on the skin surface of the subject.
11 citations
TL;DR: In this paper, a flexible transparent conductive electrode architecture based on solution-processed silver nanowire percolation metal grids (AgNW MGs) is reported, which is stably fabricated by a well-established wet coating method and subsequent selective chemical etching of the AgNWs.
Abstract: This work reports a new flexible transparent conductive electrode architecture based on solution-processed silver nanowire percolation metal grids (AgNW MGs). The AgNW MGs are stably fabricated by a well-established wet coating method and subsequent selective chemical etching of the AgNWs. The fabricated AgNW MGs exhibit good optoelectronic performance with sheet resistances of 9.9 Ω sq−1 and 14.7 Ω sq−1 at transmittances of 84.7% and 88.7%, respectively. The integration of percolated NW networks into the micro-grid structures also enables reproducible fabrication and controllable and reversible performance. The electrical robustness is greatly improved by incorporating a conductive polymer over-coating.
9 citations
TL;DR: In this paper, the authors presented a novel concept of three dimensional measurements using a rotating wire as a probe and acoustic emission (AE) for contact sensing, and a controller algorithm has been developed for automated scanning within a machine tool.
7 citations
Patent•
14 Oct 2015
TL;DR: In this paper, the authors present a sensing device and a fusing method, capable of fusing sensing signals using a fusion algorithm, which includes a sensor unit consisting of multiple integrated micro-electromechanical system (MEMS) sensors arranged at predetermined intervals, a partial filter, an overall filter, and a fusion processing unit.
Abstract: The present invention relates to a sensing device and a fusing method, capable of fusing sensing signals using a fusion algorithm. A sensing device according to an embodiment of the present invention includes a sensor unit multiple integrated micro-electromechanical system (MEMS) sensors arranged at predetermined intervals, a partial filter, an overall filter, and a fusion processing unit capable of fusing at least one sensing signals obtained by at least one MEMS sensor among the multiple integrated MEMS sensors.