Search

Recently, logistics platforms that facilitate interaction and the exchange and transaction of information have quickly emerged in the Korean domestic market. In order to further advance the development of logistics platforms into green logistics platforms in which participation in the early stages is not active, appropriate checks and balances are needed so that service providers, users, and platform operators can grow together in green logistics platforms. The purpose of this study is to empirically verify the factors affecting participants’ intentions to use green logistics platforms. Out of the 230 questionnaires distributed from 25 June to 11 July 2019, 14 were excluded from analyses due to unsatisfactory responses, while 216 responses were used for statistical processing. The structural equation model (SEM) was used to test hypotheses in this research. The results showed that the network effect and security factors influenced perceived usefulness, and trust did not affect perceived usefulness. Perceived usefulness also significantly influenced the intention to use green logistics platforms. The results of this study present strategies and directions for the future development of green logistics platforms.

The micro-gas sensor based on carbon nanotubes (CNTs) was fabricated and its gas sensing characteristics on nitrogen dioxide () have been investigated. The sensor consists of a heater, an insulating layer, a pair of contact electrodes, and CNT-sensing film on a micromachined diaphragm. The heater plays a role in the temperature change to modify sensor operation. Gas sensor responses of CNT-film to at room temperature are reported. The sensor exhibits a reversible response with a time constant of a few minutes at thermal treatment temperature of .

This paper presents heating process for obtaining standing carbon nanotube emitters to improve field‐emission properties from the screen‐printed multiwalled carbon nanotube (MWCNT) films. In an atmosphere with optimum combination of nitrogen and air for heat treatment of CNT films, the CNT emitters can be made to protrude from the surface. This allows for high emission current and the formation of very uniform emission sites without special surface treatment. The morphological change of the CNT film by this technique has eliminated additional processing steps, such as surface treatment which may result in secondary contamination and damage to the film. Despite its simplicity the process provides high reproducibility in emission current density which makes the films suitable for practical applications.

The effect of improvement on the surface morphology of screen‐printed carbon nanotube (CNT) films was studied by using the optically clear poly‐dimethylsiloxane (PDMS) elastomer for surface treatment. After the PDMS activation treatment was applied to the diode‐type CNT cathode, the entangled carbon nanotube (CNT) bundles were broken up into individual free standing nanotubes to remarkably improve the field‐emission characteristics over the as‐deposited CNT film. Also, the cathode film morphology of a top gated triode‐type structure can be treated by using the proposed surface treatment technique, which is a low‐cost process, simple process. The relative uniform emission image showed high brightness with a high anode current. This result shows the possibility of using this technique for surface treatment of large‐size field emission displays (FEDs) in the future.

By applying a critical field treatment instead of the conventional surface treatments such as soft rubber roller, ion beam irradiation, adhesive taping, and laser irradiation, electron emission properties of screen‐printed carbon nanotubes (CNTs) were enhanced and investigated based on the emission current‐voltage characteristics through scanning electron microscopy. After nanotube emitters were activated at the applied electric‐field of 2.5 V/um, the electron emission current density with good uniform emission sites reached the value of 2.13 mA/cm2, which is 400 times higher than that of the untreated sample, and the turn‐on voltage decreased markedly from 700 to 460 V. In addition, enhancement of the alignment of CNTs to the vertical direction was observed.

Diluted magnetic semiconductor (DMS) materials, which can utilize both the spin and charge properties of carriers, have attracted attention because the combination of two degrees of freedom holds promise for potential applications in spintronic devices [1, 2]. Among the various DMS materials, Ga1−x Mnx As and In1−x Mnx As DMS thin films grown on GaAs substrates have been the most extensively studied [3–6]. However, until now, the highest ferromagnetic transition temperature (Tc) obtained from III–V Ga1−x Mnx As DMS thin films has been 110 K [7]; thus, various studies on increasing the Tc of DMS materials have driven considerable efforts with the aim of realizing spintronic devices operating at higher temperature. Among several candidate DMS materials with a high Tc, (Zn1−x Cox )O DMSs are of current interest because they are theoretically expected to have high Tc values, as a consequence of the large energy gap and effective mass of (Zn1−x Cox )O [8, 9]. Since there are inherent problems due to possible existence of excess Co and CoO, the direct formation of (Zn1−x Cox )O films is very difficult. Thus, an alternative growth method of the (Zn1−x Cox )O films necessary for improving the crystallinity of films, and the improvement of the crystallinity of the films is very important in enhancing the value of Tc. Even though few works concerning the formation and the magnetic properties of the (Zn1−x Cox )O films on sapphire substrates were performed [10, 11], studies on the formation and the magnetic properties of the (Zn1−x Cox )O films on Si substrates have not been performed yet. Since Si substrates with large areas and good qualities are relatively cheap and extensively available in comparison with sapphires, Si technologies offer the potential applications for fabricating spintronic devices. This letter reports the effects of thermal annealing on the structural and optical properties of ZnO–Co digital alloys grown on p-Si (100) substrates by using the radio-frequency magnetron sputtering method. X-ray diffraction (XRD) measurement were performed to investigate the crystallization of the as-grown and the annealed ZnO–Co digital alloys, and superconducting quantum interference device (SQUID)

Objectives To investigate the expression and distribution of glycoprotein 340 (gp340), a secretory glycoprotein, in normal human sinus mucosa and inflammatory sinus mucosa and evaluate the possible effects of gp340 on the development of chronic sinusitis. Glycoprotein 340 was identified as a key element in the innate host defense mechanism on many mucosal surfaces and is directly involved in defense functions aimed at clearing gram-positive and gram-negative bacteria. Design Prospective study. Setting Tertiary academic institution. Patients Normal sinus mucosa was obtained from the ethmoid sinus mucosa of 8 patients with blowout fractures undergoing endoscopic reduction. Inflammatory sinus mucosa was taken from 25 patients with chronic polypoid sinusitis during endoscopic sinus surgery. Intervention Semiquantitative reverse transcription–polymerase chain reaction (RT-PCR), immunohistochemical analysis, and Western blotting were performed. Main Outcome Measures The expression level and distributional pattern of gp340 in normal and inflammatory sinus mucosa were analyzed. Results Transcripts of the gp340 gene were detected in all human sinus tissues analyzed by RT-PCR. Immunohistochemical analysis revealed that gp340 is mainly localized in submucosal gland of both normal and inflammatory sinus mucosa. Semiquantitative RT-PCR and Western blot analysis showed the increased expression levels of gp340 in the inflammatory sinus mucosa compared with the normal sinus mucosa. Conclusion These results suggest that gp340 may play a constitutive role in nasal defense and may be up-regulated in response to inflammation, participating in antimicrobial defense in chronic sinusitis.

not Available.