Ji-Ho Lee

This paper presents our extensive investigation of the security aspects of control plane procedures based on dynamic testing of the control components in operational Long Term Evolution (LTE) networks. For dynamic testing in LTE networks, we implemented a semi-automated testing tool, named LTEFuzz, by using open-source LTE software over which the user has full control. We systematically generated test cases by defining three basic security properties by closely analyzing the standards. Based on

This study evaluated the fracture resistance, biaxial flexural strength (BFS), and dynamic mechanical analysis (DMA) of three-dimensional (3D) printing resins for the esthetic restoration of primary molars. Two 3D printing resins, Graphy (GP) and NextDent (NXT), and a prefabricated zirconia crown, NuSmile (NS), were tested. GP and NXT samples were 3D printed using the workflow recommended by each manufacturer. Data were collected and statistically analyzed. As a result of the fracture resistance

The low mechanical properties and printing speed of fused filament fabrication (FFF) have remained important barriers to their widespread adoption in the industry. This study focused on the proposal of a layer stacking scheme that increases mechanical properties and reduces printing time through a continuously varied Infill Pattern (ConVIP). The ConVIP method showed a 15.2% and 40% increases in ultimate tensile strength, and elongation at break, compared to the conventional infill pattern within

This study investigates the mechanical and viscoelastic properties of TC-85, a biocompatible material specifically designed for orthodontic applications, with a focus on how temperature variations influence its mechanical and viscoelastic properties and their relevance to clinical outcomes. Using a Digital Light Processing (DLP) 3D printer, the photosensitive resin TC-85 is printed, and extensive thermo-mechanical testing is conducted, which includes evaluations of tensile modulus, stress relaxa

This article presents an energy-harvesting (EH) interface chip system for triboelectric nanogenerators (TENGs). Despite TENG’s numerous advantages, its high open-circuit voltage and large parasitic capacitance ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$C_{T}$ </tex-math></inline-formula> ) give a considerable burden to design TENG-EH integrated circuits (ICs). In this work, a scalable multi-chip-stacked

Increasing power density—delivering more power in a smaller footprint—stands as a pervasive trend across multiple markets, including the sector for buck DC-DC converters. One of the cardinal challenges in achieving optimized power density is navigating the intrinsic trade-off between an inductor’s volume and its parasitic DC resistance (DCR); miniaturizing the inductor invariably leads to elevated DCR. To enhance efficiency even when using compact inductors, many hybrid buck converter topologies

Among the various 3D printing methods, direct ink writing (DIW) through extrusion directly affects the microstructure and properties of materials. However, use of nanoparticles at high concentrations is restricted due to difficulties in sufficient dispersion and the deteriorated physical properties of nanocomposites. Thus, although there are many studies on filler alignment with high-viscosity materials with a weight fraction higher than 20 wt %, not much research has been done with low-viscosit

This paper presents an OLED/μLED display driver IC with cascaded loading-free capacitive interpolation (LFCI) DAC and a high-slew buffer amplifier. The 12-bit color-depth is realized by a combination of 7-bit R-DAC and proposed 5-bit LFCI DAC while occupying only 295×17μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , which is ×2 reduction compared to the state-of-the-art. In-pixel MSB-conversion is also presented to reduce chip size furt

In this paper, we investigate the system outage performance of full-duplex (FD) two-way relay networks where all nodes are equipped with FD multiple-input multiple-output (MIMO) capability and two sources exchange information via decode-and-forward (DF) relay protocol in two consecutive time slots. In order to completely separate the desired signal and interference, we consider a finite size of buffer at the relay. We propose zero-forcing based beamforming schemes for two different cases of the

3DPA technology enables precise modifications in the shape and inner thickness at specific dental sites, including the creation of ridges in targeted areas, of aligners. These alterations enhance the biomechanical capability of aligners to exert selective forces necessary for desired tooth movement while reducing the number of attachments, thereby demonstrating the clinical potential of 3D-printed aligners in orthodontic treatment.

Abstract We consider infinitely wide multi-layer perceptrons (MLPs) which are limits of standard deep feed-forward neural networks. We assume that, for each layer, the weights of an MLP are initialized with independent and identically distributed (i.i.d.) samples from either a light-tailed (finite-variance) or a heavy-tailed distribution in the domain of attraction of a symmetric $\alpha$ -stable distribution, where $\alpha\in(0,2]$ may depend on the layer. For the bias terms of the layer, we as