Jihun Kim

Thermal properties and nonisothermal crystallization kinetics of polyolefin nanocomposites (high-density polyethylene/multiwalled carbon nanotubes) were characterized by differential scanning calorimetry and thermogravimetric analysis. In situ metallocence polymerization was used to prepare nanocomposites of multiwalled carbon nanotubes (MWCNTs) and high-density polyethylene (HDPE). This polymerization method consists of attaching a metallocene catalyst complex onto the surface of the MWCNTs fol

In situ metallocence polymerization was used to prepare nanocomposites of multiwalled carbon nanotubes (MWCNT) and high density polyethylene (HDPE). This polymerization method consists of attaching a metallocene catalyst complex onto the surface of MWCNT followed by surface-initiated polymerization to generate polymer brushes on the surface. All the procedures of polymerization made progress with one-pot process. The morphological observation of nanocomposites using scanning electron microscopy

We report the first experimental demonstration of a three-terminal nanoelectromechanical field effect transistor (NEMFET) with measurable subthreshold slope as small as 6 mV/dec at room temperature and a switching voltage window of under 2 V. The device operates by modulating drain current through a suspended nanowire channel via an insulated gate electrode, thus eliminating the need for a conducting moving electrode, and yields devices that reliably switch on/off for up to 130 cycles. Radio-fre

A new benchmark for DSSC performances is set using a novel dye and fabricating a very efficient resonant light-scattering device with a high photocurrent and good stability.

This study presents a new mobile robot with passively articulated driving tracks for high terrainability (TA) and maneuverability (MA) on unstructured, rough terrain. The mobile robot consists of four driving tracks, two rocker links, and four pitch-roll two-degrees-offreedom (2-DOF) passive joints. For performance evaluation, the proposed mechanism was compared with several existing mechanisms, including four tracked mechanisms and three wheel linkage-type mechanisms. Dynamic simulations of ref

Two novel electron-donor molecules based on donor−π-conjugated linker–acceptor structure with compact packing and intramolecular charge-transfer characteristics were synthesized for the preparation of efficient organic solar cells. The donor molecules featuring an electron-rich triphenyl amine as the electron-donor unit, dicyanovinylene as the acceptor unit, and π-conjugated linkers of thienothiophene, thiophene, and thiazole units were synthesized. The π-conjugated linkers were carefully design

To effectively attenuate unrecognized and/or unwanted exposures to high‐energy γ‐rays which leads to occupational hazards when accumulated in a wide range of industries, nonleaded metal (bismuth(Bi)‐tin(Sn))/polymer and tungsten (W) composites are prepared and tested. A eutectic alloy, BiSn, with a low melting temperature of 139 °C, is applied for the first time to prepare a γ‐ray shielding material. Compounding of the BiSn alloy/polymer is conducted in a twin screw mixer/extruder by exploiting

Background: Whether depression before diagnosis of dyslipidemia is associated with higher cardiovascular disease (CVD) risk among newly diagnosed dyslipidemia patients is yet unclear. Methods: The study population consisted of 72,235 newly diagnosed dyslipidemia patients during 2003 to 2012 from the National Health Insurance Service–Health Screening Cohort of South Korea. Newly diagnosed dyslipidemia patients were then detected for pre-existing depression within 3 years before dyslipidemia diagn

Efficient vacuum‐deposited tandem organic photovoltaic cells (TOPVs) composed of pristine fullerenes as the acceptors and two complementary absorbing donors, 2‐((2‐(5‐(4‐(diphenylamino)phenyl)thieno[3,2‐b]thiophen‐2‐yl)thiazol‐5‐yl)methylene)malononitrile for the visible absorption and 2‐((7‐(5‐(dip‐tolylamino)thiophen‐2‐yl)benzo[c]‐[1,2,5]thiadiazol‐4‐yl)methylene)malononitrile for the near‐infrared absorption, are reported. Two subcells are connected by the interconnection unit (ICU) composed

Metal-free organic dyes comprising donor, electron-conducting, and acceptor moieties with anchoring groups were synthesized for the sensitization of hierarchically structured TiO₂ (HS-TiO₂) nanoaggregates of TiO₂ electrode.

Objective: To evaluate the temporal evolution and diagnostic values of the diffusion tensor imaging (DTI) and the high b value diffusion weighted imaging (DWI) in the early permanent and transient cerebral ischemia. Materials and Methods: For permanent or 30-minute transient-ischemia induced 30 rats, DTI and DWIs at both high b (b = 3000 s/mm2) and standard b value (b = 1000 s/mm2) were obtained at the following conditions: at 15, 30, 45, 60 minutes after the occlusion of what for hyperacute per

In order to protect from the unrecognized exposures to high-energy γ-rays, Yongsok Seo, and co-workers, article number 1901448, prepared nonleaded metal (BiSn)/polymer and tungsten (W) composites. A multi-layer (BiSn / polymer)/W laminate can offer a sufficient thickness with flexibility and an effective shielding against γ-rays to be used for protective clothing or equipment.

A Q-band pHEMT image-rejection low-noise amplifier (IRLNA)is presented using inter-stage tunable resonators. Theinter-stage L-C resonators can maximize an image rejection byfunctioning as inter-stage matching circuits at an operatingfrequency (FOP) and short circuits at an image frequency (FIM). In addition, it also brings more wideband image rejection thanconventional notch filters. Moreover, tunable varactors in L-Cresonators not only compensate for the mismatch of an imagefrequency induced by

This work provides a comprehensive analytical analysis of one‐selector‐one‐resistor (1S1R) crossbar array (CBA) device for hardware neural network (HNN) applications. Simplified analytical device models are prepared from a particular 1S1R device to validate the analysis. The read margin (RM) analysis results show that the V /3 voltage scheme and reduced selector leakage are necessary to maximize the RM and maximum operable size N of the CBA, where N indicates the number of wires (word line or bi