Hemodynamics in a three-dimensional printed aortic model: a comparison of four-dimensional phase-contrast magnetic resonance and image-based computational fluid dynamics

Magnetic Resonance Materials in Physics, Biology and Medicine - This study aims to compare an electrocardiogram (ECG)-gated four-dimensional (4D) phase-contrast (PC) magnetic resonance imaging...     

Public trust in a mobile device and service policy in South Korea: The Mobile Device Distribution Improvement Act

South Korea has the highest expenditure on telecommunications among OECD countries, drawing national attention to the issue of reducing high prices. In response, the Korean government enacted the Mobile Device Distribution Improvement (MDDI) Act to eliminate information asymmetry by limiting mobile carriers’ mobile handset subsidies to consumers. This study examined factors affecting public trust in the MDDI based by analyzing responses to a questionnaire survey using the ordered probit model. The results show that the knowledge, expectations, and perceived effects of the MDDI have a meaningful effect on public trust in the policy. The results of this study confirm that it is essential for governments to promote their policies by continuously educating the public, especially in this case because the policy has a direct effect on telecommunications expenditures.     

Solution phase synthesis of amyloid-cleaving catalysts, two [1,3,5]triazine based compounds

Solution phase synthetic method for amyloid-cleaving catalysts was developed, which bears triazine core, scaffold with bulky and that have various solubility properties; Co(III) complex of cyclen (1,4,7,10-tetraazacyclododecane) for catalytic group, and two imaging agents for binding group. This synthetic method was identified by H-NMR, C-NMR for intermediates and MS for the last products. The yields by this method surpassed solid phase synthesis and took much lower labor, expense, and time. The products which were synthesized by solution phase synthetic method showed good catalytic activities.     

Study on hydrogenated silicon nitride for application of high efficiency crystalline silicon solar cells

The hydrogenated silicon nitride films (SiN_x:H) deposited by plasma enhanced chemical vapor deposition (PECVD) technique is commonly used as an antireflection coating as well as surface passivating layer of crystalline silicon solar cells. The refractive indices of SiN_x:H films could be changed by varying the growth gas ratio R(=NH₃/SiH₄+NH₃) and annealing temperature. For optimum SiN_x:H film, the optical and chemical characterization tools by varying the film deposition and annealing condition were employed in this study. Metal-insulator-semiconductor (MIS) devices were fabricated using SiN_x:H as an insulator layer and they were subjected to capacitance-voltage (C-V) and current-voltage (I-V) measurements for electrical characterization. The effect of rapid thermal annealing (RTA) on the surface passivation as well as antireflection properties of the SiN_x:H films deposited at various process conditions were also investigated for the fabrication of low cost and high efficiency silicon solar cells.     

High-resolution, resistless patterning of indium-tin-oxide thin films using excimer laser projection annealing process

High-resolution, large-area patterning of indium-tin-oxide (ITO) thin film was demonstrated using an excimer laser projection crystallization process. After amorphous ITO (a-ITO) was deposited on a glass substrate, the a-ITO was selectively crystallized using an excimer laser scanning projection exposure system. Following the selective crystallization, the substrate was dipped in an etchant for an optimized time, resulting in formation of high-resolution patterns of polycrystalline ITO (p-ITO) on the substrate because the a-ITO has higher etch rate than the p-ITO. The p-ITO patterns were clean and sharp, and the pattern quality was suitable for production applications in the microelectronics industry.     

Tiling integral floating display system with optimized viewing window

A tiling integral floating display system is proposed using the optimization of viewing window. The integral floating display, which is a combination of an integral imaging system and a floating lens, has many advantages, but it is hard to realize a large system due to the cost and difficulties in making the large floating device. In this paper, the stackable integral floating display is proposed by modifying the size of the viewing window to be the same as that of the display device, which can be a solution for the large scale autostereoscopic three-dimensional display system.     

Structure-Controlled Carbon Hosts for Dendrite-Free Aqueous Zinc Batteries

The surging demand for environmental-friendly and safe electrochemical energy storage systems has driven the development of aqueous zinc (Zn)-ion batteries (ZIBs). However, metallic Zn anodes suffer from severe dendrite growth and large volume change, resulting in a limited lifetime for aqueous ZIB applications. Here, it is shown that 3D mesoporous carbon (MC) with controlled carbon and defect configurations can function as a highly reversible and dendrite-free Zn host, enabling the stable operation of aqueous ZIBs. The MC host has a structure-controlled architecture that contains optimal sp²-carbon and defect sites, which results in an improved initial nucleation energy barrier and promotes uniform Zn deposition. As a consequence, the MC host shows outstanding Zn plating/stripping performance over 1000 cycles at 2 mA cm⁻² and over 250 cycles at 6 mA cm⁻² in asymmetric cells. Density functional theory calculations further reveal the role of the defective sp²-carbon surface in Zn adsorption energy. Moreover, a full cell based on Zn@MC900 anode and V₂O₅ cathode exhibits remarkable rate performance and cycling stability over 3500 cycles. These results establish a structure-mechanism-performance relationship of the carbon host as a highly reversible Zn anode for the reliable operation of ZIBs.