김혁 교수

A new device incorporating RF treatment before HA filler injection may represent a biocompatible and long-lasting advance in skin rejuvenation.

BACKGROUND: Both the i-gel™ (i-gel) and LMA Supreme™ (Supreme) are new single-use second generation supraglottic airway devices available in pediatric sizes. This study was designed to investigate the i-gel in comparison with the Supreme in children undergoing general anesthesia. METHODS: One hundred children with American Society of Anesthesiologists physical status I or II undergoing general anesthesia were randomly assigned to either the i-gel or the Supreme group (50 children in each group).

BACKGROUND: Facial aging is the result of intrinsic and extrinsic factors that lead to gradual reduction of dermal extracellular components and skin elasticity and wrinkle formation. A novel stent-shaped biodegradable and biocompatible scaffold device braided with absorbable polydioxanone (PDO) multifilaments was recently marketed for tissue suturing and augmentation. OBJECTIVE: To explore tissue regeneration profiles following implantation of the stent-shaped hollow scaffold in rats and mini-pi

In this paper, we are interested in left invariant flat affine structures on Lie groups. These structures has been studied by many authors in different contexts. One of the fundamental questions is the existence of complete affine structures for solvable Lie groups G, raised by Minor [15]. But recently Benoist answered negatively even for the nilpotent case [1]. Also moduli space of such structures for lower dimensional cases has been studied by several authors, sometimes with compatible metrics

The success rate of FNI increased as the number of FNI performed by residents increased despite the nasal bleeding.

For a $d$-dimensional cell complex $\Gamma$ with $\tilde{H}_{i}(\Gamma)=0$ for $-1\leq i < d$, an $i$-dimensional tree is a non-empty collection $B$ of $i$-dimensional cells in $\Gamma$ such that $\tilde{H}_{i}(B\cup \Gamma^{(i-1)})=0$ and $w(B):= |\tilde{H}_{i-1}(B\cup \Gamma^{(i-1)})|$ is finite, where $\Gamma^{(i)}$ is the $i$-skeleton of $\Gamma$. The $i$-th tree-number is defined $k_{i}:=\sum_{B}w(B)^{2}$, where the sum is over all $i$-dimensional trees. In this paper, we will show that

In this paper, we study the developing maps of the Lie groups with left-invariant affinely flat structures. We make some bacis observations on the nature of the developing images and show that the developing map for an incomplete affine structure splits as a product of a covering map of codimension 1 and a diffeomorphism of dimension 1.

BACKGROUND: Although dental sedation helps control anxiety and pain, side effects and serious complications related to sedation are gradually increasing. Due to the introduction of new drugs and sedation methods, insurance rates, legal regulations, drugs, and methods used for dental sedation are inevitably changed. In the Republic of Korea, National Health Insurance is applied to all citizens, and this study investigated changes in the use of sedatives using this big data. METHODS: This study us

It is known that a knot complement (minus two points) decomposes into ideal octahedra with respect to a given knot diagram. In this paper, we study the Ptolemy variety for such an octahedral decomposition in perspective of Thurston’s gluing equation variety. More precisely, we compute explicit Ptolemy coordinates in terms of segment and region variables, the coordinates of the gluing equation variety motivated from the volume conjecture. As a consequence, we present an explicit formula for compu

<div class="htmlview paragraph">The objective of this study is to develop a neuro controlled active suspension for the ride quality improvement. The performance index of the optimal control is represented as the frequency-shaped using Parseval's theorem. The incorporation of frequency-dependent weighting matrices allow one to emphasize the specific variables related to the vibrations of the specific bands of frequencies. Once the active control law is obtained, we use the artificial neural

Which simply connected Lie group admits a complete left-invariant affine structure, or equivalently which Lie groups acts simply transitively on R('n) as affine transformations, is an important open question in the study of affine manifolds. We study some basic properties of such Lie groups through the left-symmetric product on its Lie algebra defined by the connection. The classification problem of such structures is known for dimensions less than 4. The case of dimension 4 when the group is ni