한동헌 교수

Real-time in situ spectroelectrochemical studies have been carried out in N,N'-dimethyl formamide containing lithium trifluoromethane sulfonate as an electrolyte and the results are reported. The results indicate that the primary reduction product of the cyclic form of sulfur, S-8c(2-), undergoes an equilibrium reaction to its linear chain counterpart, S-81(2-), which then dissociates into various products. These two dianions and S-3(-.) were produced along with a minor product, S-4(2-)

Electrical and morphological properties of poly(3,4-ethylenedioxythiophene) (PEDOT) thin films electrodeposited on gold-on-silicon electrodes by galvanostatic, potentiostatic, and potentiodynamic methods have been determined using current sensing atomic force microscopic experiments. Surface morphologies and vertical conductivities of PEDOT films were affected by the experimental parameters including the preparation method, the current density, the potential, and the potentiodynamic cyclic numbe

The conductivities of electrochemically prepared polyaniline (PAn) films have been determined using an atomic force microscopic tip with a conducting probe after the films were doped/dedoped at various potentials. The results indicate that the PAn films are rather inhomogeneous, even though the film is doped or dedoped until no further anodic or cathodic currents flow. This inhomogeneity was shown to be present even in the PAn nanostructures. The conductivities of the film ranged as widely as by

Currently, a few of studies revealed that there is an association between mastication and cognitive impairment. There is no study of Korean adult representative samples in relation to mastication and cognitive decline. This study was to investigate the relationship between mastication and mild cognitive impairment in Korean adults.A population-based cross-sectional study was conducted in which a total of 7029 subjects (2987 men and 4042 women) over 45 years old were surveyed from the Korea Longi

Dental sealants and composite filling materials containing bisphenol-A (BPA) derivatives are increasingly used in children. The aim of this study was to evaluate the association between salivary BPA and the number of tooth surfaces filled with dental sealant, and to determine a cutoff BPA level. Salivary BPA concentration and the number of tooth surfaces filled with dental sealant/resin were determined in 124 age and gender matched children: 62 controls had no dental sealant/resin on their tooth

The results suggest that smoking has a significant impact on the periodontal health of Korean adults, but the combined effect of smoking and diabetes had no significant impact.

We found improvement in oral health and the quality of life in HNC patients with comprehensive oral care intervention by dental professionals. Communicating and cooperating between the healthcare and dental professionals is needed to raise the quality of health care services for HNC patients receiving radiotherapy.

Risk factors such as smoking and sugar intake threaten the health of human being at an individual national level as well as at a global level. The globalization affect health indirectly through macro and micro-level factors. This study aimed to identify the global trend of dental caries according to countries national income level, and to examine the role of globalization, health services, obesity, and sugar consumption on dental caries. Data for 160 countries were collected for the time period

Zinc telluride films were prepared electrochemically on gold electrodes via a two-step method. The tellurium(0) was first deposited on the gold electrode by potentiostatically reducing tellurium(IV) dissolved in an acidic solution. The zinc telluride film was then prepared by potentiostatic or potentiodynamic reduction of the tellurium film thus deposited in the presence of zinc sulfate. The film deposition was supported by the frequency decreases recorded during the deposition of tellurium and

Findings of this cross-sectional study suggest that shift work may be associated with periodontitis. Shift workers aged ≥45 years and irregular shift workers aged ≥45 years were risk groups for periodontitis.

Tooth-brushing is one of the most important health behaviors to teach children considering potentially serious ramifications of poor dental health. However, children's tooth-brushing behavior is affected by various developmental factors. The aim of this cross-sectional study was to investigate factors related to the tooth-brushing behavior of children adopting the Theory of Planned Behavior. A preliminary elicitation study with 33 primary school students identified underlying beliefs related to

Objective: The extent to which periodontitis is attributable to smoking in Korea has been examined rarely. The aims of this study are to investigate the association between smoking and periodontitis and to estimate the public health impact of smoking on periodontitis in Korea. Methods: The Korean National Oral Health Survey 2006 collected nationally representative oral epidemiologic data for the Korean population. Examiners measured periodontal health status using the community periodontal index

A growing body of literature suggests that oral health can influence cognitive function during aging. However, it is currently unclear whether reduced masticatory efficiency influences cognitive impairment in longitudinal studies.This study sought to investigate the effects of reduced chewing ability on the incidence of cognitive impairment using national representative data from 10 years of follow-up in Korea. Among the 10,254 people recruited in 2006 (1st wave), 7568 with normal cognitive func