김대식 교수

The prevalence of mood disorders, anxiety disorders, sleep disorders, and all psychiatric disorders for workers in the healthcare industry was higher than that of other Korean workers. The strikingly high prevalence of sleep disorders could be related to the frequent night-shifts in these professions. The high prevalence of mental health problems among workers in healthcare industry is alarming and requires prompt action to protect the health of the "protectors."

Doping and alloying are fundamental strategies to improve the thermoelectric performance of bare materials. However, identifying outstanding elements and compositions for the development of high-performance thermoelectric materials is challenging. In this study, we present a data-driven approach to improve the thermoelectric performance of SnSe compounds with various doping. Based on the newly generated experimental and computational dataset, we built highly accurate predictive models of thermoe

Long working hours are significantly associated with the risks of CHD and stroke, estimated by Jee's health risk-appraisal model. This study suggests the need for proper management of working hours to reduce CHD risk and stroke risk in the Korean population.

A high proportion of computer use at work may be associated with depressive and anxiety disorder. This finding suggests the necessity of a work guideline to help the workers suffering from high computer use at work.

Abstract Thermoelectric materials can generate electric power from dissipating heat without releasing any undesirable chemicals. They thus can increase global energy efficiency and reduce the use of fossil fuels that are a major resource for generating electric energy, thereby concurrently addressing energy and environmental crises seriously threatening humanity. Increasing a thermoelectric figure of merit, ZT, of materials has been a prime goal in thermoelectrics because an efficiency of thermo

OBJECTIVE: To evaluate the association between long working hours and risk of coronary heart disease (CHD) estimated by Framingham risk score (FRS) in Korean adults. METHODS: This study evaluated adult participants in Korean National Health and Nutrition Examination Survey IV (2007-2009). After inclusion and exclusion criteria were applied, the final sample size for this study model was 8,350. Subjects were asked about working hours and health status. Participants also completed physical examina

We report on terahertz electromagnetic field transmission through metallic slot antennas supported on various dielectric substrates. The substrate effect strongly modifies the transmission resonance compared to the free-standing case, while the resonance can be determined systematically by introducing an effective refractive index. The relative contribution of the substrate index to the effective index has been measured for various substrates, and shows a good agreement with theoretical calculat

The results demonstrated that increased risk of CVD was associated with long working hours, especially in women and wageworkers.

We observed the high- and low-frequency E$_2$ optical phonon modes of wurtzite ZnO. Their dephasing times of 1.75 ps, 29.2 ps were obtained at room temperature. We tested polarization dependence of the coherent phonon excitation and the behavior is fully consistent with the selection of the Impulsive Stimulated Raman Scattering(ISRS), identifying the generation mechanism. Also, we studied the relations between the optical phonon intensity and the pulse width of the transform-limited pump pulse.

Fluorescent Au nanocrystals (AuNCs)-silica hybrid nanocomposite (FLASH) was synthesized by co-condensation of surface-modified AuNCs. Present FLASH nanocomposite exhibited four times the enhanced photoluminescence and photocatalytic activity compared to single nanocrystals. On the basis of these enhanced optical features, we successfully demonstrated in vitro fluorescence bioimaging of introduced FLASH to human cervical cancer cell line (HeLa). Beyond the confirmation of photocatalytic activity

본고는 조선후기 대표적 지방교육 진흥책으로 간주되는 귀록 조현명의 교육 개혁안의 구체적 내용을 검토하고 그것이 갖는 특징을 고찰하는 것을 목적으로 한다. 조현명은 무신란 이후 영남인들의 민심을 순화할 필요 속에서 낙육재를 개수하고 권학절목의 시행을 추진하였다. 그는 이 권학절목에서 읍의 교육을 담당하는 도훈장과 면을 담당하는 면훈장을 지정하여 이들에게 각각 거재 유생과 각면학도의 교육을 맡겼다. 이들 도훈장과 면훈장은 향교나 서원에 소속된 직책이 아니어서 권학절목의 원안을 그대로 시행하는 데 많은 어려움을 겪었고, 거재유생의 강학처로 지정했던 향교 역시 거재유생들을 수용하는 것이 용이하지 않았다. 이에 조현명을 보좌한 도훈장들은 서원을 거재 유생의 강학공간으로 활용할 것을 제안하였고 서원은 향교와 함께 거재유생의 강학처로 활용되었다. 조현명의 개혁안은 기존의 향교와 서원의 인적교육적 기반의 바탕 위에 도훈장과 면훈장이라는 교회직을 설정하여 지방교육을 개혁하려고 한 시도로 평가할 수

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