Sungkyunkwan University

About: Sungkyunkwan University is a education organization based out in Seoul, South Korea. It is known for research contribution in the topics: Graphene & Thin film. The organization has 28229 authors who have published 56428 publications receiving 1352733 citations. The organization is also known as: 성균관대학교.

Monitoring Multiwalled Carbon Nanotube Exposure in Carbon Nanotube Research Facility

Abstract: With the increased production and widespread use of multiwalled carbon nanotubes (MWCNTs), human and environmental exposure to MWCNTs is inevitably increasing. Therefore, this study monitored the possible exposure to MWCNT release in a carbon nanotube research laboratory. To estimate the potential exposure of researchers and evaluate the improvement of the workplace environment after the implementation of protective control measures, personal and area monitoring were conducted in an MWCNT research facility where the researchers handled unrefined materials. The number, composition, and aspect ratio of MWCNTs were measured using scanning transmission electron microscopy with an energy-dispersive x-ray analyzer. The gravimetric concentrations of total dust before any control measures ranged from 0.21 to 0.43 mg/m(3), then decreased to a nondetectable level after implementing the control measures. The number of MWCNTs in the samples obtained from the MWCNT blending laboratory ranged from 172.9 to 193.6 MWCNTs/cc before the control measures, and decreased to 0.018-0.05 MWCNTs/cc after the protective improvements. The real-time monitoring of aerosol particles provided a signature of the MWCNTs released from the blending equipment in laboratory C. In particular, the number size response of an aerodynamic particle sizer with a relatively high concentration in the range of 2 to 3 microm in aerodynamic diameter revealed the evidence of MWCNT exposure. The black carbon mass concentration also increased significantly during the MWCNT release process. Therefore, the present study suggests that the conventional industrial hygiene measures can significantly reduce exposure to airborne MWCNTs and other particulate materials in a nano research facility.

Transforming the Developmental Welfare State in East Asia

Abstract: This article attempts to explain changes and continuity in the developmental welfare states in Korea and Taiwan within the East Asian context. It first elaborates two strands of welfare developmentalism (selective vs. inclusive), and establishes that the welfare state in both countries fell into the selective category of developmental welfare states before the Asian economic crisis of 1997. The key principles of the selective strand of welfare developmentalism are productivism, selective social investment and authoritarianism; inclusive welfare development is based on productivism, universal social investment and democratic governance. The article then argues that the policy reform toward an inclusive welfare state in Korea and Taiwan was triggered by the need for structural reform in the economy. The need for economic reform, together with democratization, created institutional space in policy-making for advocacy coalitions, which made successful advances towards greater social rights. Finally, the article argues that the experiences of Korea and Taiwan counter the neo-liberal assertion that the role of social policy in economic development is minor, and emphasizes that the idea of an inclusive developmental welfare state should be explored in the wider context of economic and social development.

Search for new physics in the multijet and missing transverse momentum final state in proton-proton collisions at √s=8 Tev

Abstract: A search for new physics is performed in multijet events with large missing transverse momentum produced in proton-proton collisions at sqrt(s)=8 TeV using a data sample corresponding to an integrated luminosity of 19.5 inverse femtobarns collected with the CMS detector at the LHC. The data sample is divided into three jet multiplicity categories (3-5, 6-7, and 8 or more jets), and studied further in bins of two variables: the scalar sum of jet transverse momenta and the missing transverse momentum. The observed numbers of events in various categories are consistent with backgrounds expected from standard model processes. Exclusion limits are presented for several simplified supersymmetric models of squark or gluino pair production.