이정욱 교수

Metal complexation-based gelation imparts load-bearing hydrogels with striking properties like reversibility, self-healing, and mechanical tunability. Using a bio-inspired metal–catechol complex, these properties have been introduced to a variety of polymer hydrogels, except hyaluronic acid, which is widely used in biological applications. In this research, we developed two different hyaluronic acid (HA) hydrogels by regulating the gelation kinetics of Fe 3+ and a catechol cross-linker, includin

This article describes a simple method for the generation of multicomponent gradient surfaces on self-assembled monolayers (SAMs) on gold in a precise and predictable manner, by harnessing a chemical reaction on the monolayer, and their applications. A quinone derivative on a monolayer was converted to an amine through spontaneous intramolecular cyclization following first-order reaction kinetics. An amine gradient on the surface on a scale of centimeters was realized by modulating the exposure

With the increasing number of social media users in recent years, news in various fields, such as politics, economics, and so on, can be easily accessed by users. However, most news spread through social networks including Twitter, Facebook, and Instagram has unknown sources, thus having a significant impact on news consumers. Fake news on COVID-19, which is affecting the global population, is propagating quickly and causes social disorder. Thus, a lot of research is being conducted on the detec

Thiol-containing (bio)molecules, such as cysteine (Cys), homocysteine (Hcy), and glutathione (GSH), are recognized to be physiologically important and known to be involved in many diseases, such as leucocyte loss, psoriasis, liver damage, and cancer, depending on changes in the cellular level. 1 Particularly, GSH, which exists in high abundance in biological systems, plays key roles in a variety of biological processes including maintenance of intracellular redox activities and cellular homeosta

본 논문에서는 유색잡음에 의해 오염된 음성신호의 음성향상 알고리즘을 제안한다. 유색잡음과 음성신호가 서로 상관이 없을 경우 유색잡음은 백색화 변환을 통해 무색잡음으로 변환된다. 이 변환된 신호를 음성신호 향상을 위한 일반화된 부공간 접근법에 적용한다. 전처리 과정에서의 백색화 변환으로 발생되는 음성 스펙트럼 왜곡은 제안한 알고리즘의 후처리를 통해 역 백색화하여 복구한다. 제안한 알고리즘의 성능을 컴퓨터 시뮬레이션으로 확인하였다. 사용한 유색잡음은 자동차 잡음과 멀티 토커 배블 잡음이다. AURORA 및 TIMIT 데이터 베이스에서 취득한 데이터로 실험했을 때 제안하는 방법이 신호대잡음비 및 스펙트럼 왜곡 측면에서 기존 접근법보다 개선됨을 확인하였다. In this paper, we proposed an algorithm for speech enhancement of speeches corrupted by colored noise. When there is no correlation

Infectious disease outbreaks present ongoing and substantial challenges to health systems at local, national, and global levels, testing their preparedness, response capabilities, and resilience. This study aimed to identify and analyze critical health system-level factors that influence infection outbreaks, focusing on the experience of the COVID-19 pandemic in Korea. Conducted as a secondary data analysis, this study utilized national datasets from Korea. Given the inherent spatial dependencie

본 연구는 제6기, 7기, 8기 국민건강영양조사 자료를 활용하여 40세 이상 65세 이하의 중년 1인 가구원 742명을 대상으로 사회인구학적, 건강상태 및 건강형태 특성에 따른 자살 생각의 영향요인을 분석하고자 시도되었다. 자료분석은 IBM SPSS 25 프로그램을 활용하여 복합표본설계를 적용하여 빈도분석, 교차분석, 로지스틱 회귀분석을 시행하였다. 연구결과, 중년 1인 가구원의 자살 생각률은 11.4% 였으며, 자살 생각의 영향요인은 소득수준, 경제활동, 스트레스, 우울감, 정신건강문제 상담여부인 것으로 확인되었다. 소득수준이 ‘상’ 경우에 비해 ‘하’인 경우가 15.187배, 경제활동을 하지 않는 경우에 비해 하는 경우가 .205배, 스트레스를 덜 받는 경우에 비해 많이 받는 경우가 4.240배, 우울감을 느끼는 경우가 느끼지 않는 경우에 비해 9.906배, 정신건강문제로 상담을 받은 경우가 받지 않은 경우에 비해 4.916배 자살생각이 높은 것으로 나타난 연구결과는 중년 1인

In this study, we developed an automatic veneer sorting system controlled by nonlinear friction and nonlinear stiffness. With these nonlinear characteristics. it was difficult to analysis and to control the system in the fast. However it is necessary to consider nonlinear characteristics to satisfy accurate and rapid control demand in these days. We used not only nonlinear friction but also nonlinear stiffness and combined both to control the system. An experimental device was designed with 4 AC

This paper examines the activities of the traditional performing arts group “Nondureongbatdureong” in the Gongju region, focusing on the reenactment nature of village pungmul music and the changing paths of its transmission within the cultural heritage of the region. In pre-modern society, pungmul was transmitted primarily through specialized performing groups and villages known as “Durepungjang.” However, with the dissolution of Dure, village pungmul-gut gradually lost its transmission power. P