Choi v. Kim

USDC for the District of New Jerse

Young-Eun Choi, piano

Joseph HaydnWolfgang Amadeus MozartLudwig van BeethovenJohannes Brahm

Vortices around Dragonfly Wings

Dragonfly beats its wings independently, resulting in its superior maneuverability. Depending on the magnitude of phase difference between the fore- and hind-wings of dragonfly, the vortical structures and their interaction with wings become significantly changed, and so does the aerodynamic performance. In this study, we consider hovering flights of modelled dragonfly with three different phase differences (phi=-90, 90, 180 degrees). The three-dimensional wing shape is based on that of Aeschna juncea (Norberg, 1972), and the Reynolds number is 1,000 based on the maximum translational velocity and mean chord length. The numerical method is based on an immersed boundary method (Kim et al., 2001). In counter-stroke (phi=180 degree), the wing-tip vortices from both wings are connected in the wake, generating an entangled wing-tip vortex (e-WTV). A strong downward motion induced by this vortex decreases the lift force in the following downstroke (Kweon and Choi, 2008). When the fore-wing leads the hind-wing (phi=90 degree), the hind-wing is submerged in the vortices generated by the fore-wing and suffers from their induced downwash flow throughout the downstroke, resulting in a significant reduction of lift force. On the other hand, when the hind-wing leads the fore-wing (phi=-90 degree), the e-WTV is found only near the start of hind-wing upstroke. In the following downstroke of hind-wing, most of the e-WTV disappears and the hind-wing is little affected by this vortex, which produces relatively large lift force.Comment: Gallery of Fluid Motio

Book review: Russia’s Long Twentieth Century. Voices, Memories, Contested Perspectives

Book review "Chatterjee, Choi, Kirschenbaum, Lisa A. & Field, Deborah A., Russia’s Long Twentieth Century. Voices, Memories, Contested Perspectives. Abingdon & New York, NY: Routledge, 2016

CH 500 Turning Points in Church History

Noll, Mark A. Turning Points: Decisive Moments in the History of Christianity, 2nd ed. Grand Rapids: Baker Academic Books, 2000. Olson, Roger E. The Story of Christian Theology: Twenty Centuries of Tradition & Reform. Downers Grove, IL: InterVarsity Press, 1999. Selected primary source and additional readings cited under each lesson (see the Course and Reading Schedule) are available in electronic and/or library reserves (Intra\School of Theology\Lecture Power Points\Choi, Meesaeng\CH500).https://place.asburyseminary.edu/syllabi/2556/thumbnail.jp

CH 500 Turning Points in Church History

Noll, Mark A. Turning Points: Decisive Moments in the History of Christianity, 2nd ed. Grand Rapids: Baker Academic Books, 2000. Olson, Roger E. The Story of Christian Theology: Twenty Centuries of Tradition & Reform. Downers Grove, IL: InterVarsity Press, 1999 Selected primary source and additional readings cited under each lesson (see the Course and Reading Schedule) are available in electronic and/or library reserves (Intra\School of Theology\Lecture Power Points\Choi, Meesaeng\CH500).https://place.asburyseminary.edu/syllabi/3057/thumbnail.jp