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Conflict, International Response, and Forced Migration in Sub-Saharan Africa, 1980-2007
송영훈 한국국제정치학회 2012 The Korean Journal of International Studies Vol.10 No.1
This study investigates the effect of conflicts and international humanitarian response on decisions of forcibly displaced people, including refugees and internally displaced persons (IDPs), about where to relocate in sub-Saharan countries between 1980 and 2007. Although light has been shed on the plight of displaced people in studies on forced migration and international relations, no clear-cut answer exists as to what condition some displaced people relocate themselves within their country of origin while others seek refuge abroad. I argue that displaced people respond to violent conflict by making decisions, within their constrained freedom of choice, about where they go based on the expected levels of threat and humanitarian assistance and protection. The results of fractional logit analyses show that humanitarian operations where the United Nations High Commissioner for Refugees (UNHCR) is involved in a country of origin reduce the proportion of refugees fleeing from the country, while they are not statistically significant in terms of the proportion of refugees residing in a country of asylum. This mixed finding is closely related to the fact that sub-Saharan countries recently have securitized refugees such that these countries are reluctant to receive refugees, producing a lot more IDPs than refugees.
평판형 유전체 장벽 방전 반응기에서 Acetonitrile의 분해 특성
송영훈,김관태,류삼곤,이해완 한국군사과학기술학회 2002 한국군사과학기술학회지 Vol.5 No.3
A combined process of non-thermal plasma and catalytic techniques has been investigated to treat toxic gas compounds in air. The treated gas in the present study is $CH_3$CN that has been known to be a simulant of toxic chemical agent. A planar type dielectric barrier discharge(DBD) reactor has been used to generate non-thermal plasma that produces various chemically active species, O, N, OH, $O_3$, ion, electrons, etc. Several different types of adsorbents and catalysts, which are MS 5A, MS 13X, Pt/alumina, are packed into the plasma reactor, and have been tested to save power consumption and to treat by-products. Various aspects of the present techniques, which are decomposition efficiencies along with the power consumption, by-product analysis, reaction pathways modified by the adsorbents and catalysts, have been discussed in the present study.
Evaluation of Mechanical and Thermal Properties of Hydroxyapatite-levan Composite Bone Graft
송영훈,주계일,서정현 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.2
Biodegradable materials have been received great attention as bone graft substitutes for bone regeneration and tissue engineering. However, their low mechanical property remains a major challenge for the use in loadbearing applications. Here, we developed mechanically reinforced composite scaffold containing adhesive levan as a binder for sintered hydroxyapatite (sHAp) and then examined the mechanical and thermal properties of the composite scaffold. We found that sHAp-levan composite scaffold exhibited remarkably enhanced mechanical strength, which is similar to that of polymethyl methacrylate (PMMA) bone cement. This composite scaffold can be utilized as a promising bone graft for bone regeneration and tissue engineering.