첫수 융합포럼 개최 안내
The First Wednesday Multidisciplinary Forum
수리과학과, 해양및시스템공학전공에서 공동으로 주관하는 2014년 9월 첫수 융합포럼에 여러분을 초대합니다.
“Department of Mathematical Sciences” and “Div. of Ocean Systems Engineering” would like to invite you "The First Wednesday Multidisciplinary Forum” as follows.
❏ 일시 : 2014. 9. 3(수) 정오 12시
Date : September 3(Wed.), 2014, 12:00 at noon
❏ 장소 : 창의학습관 (Bldg #E11) 201호
Venue : Room #201, Creative Learning Bldg. (#E11)
❏ 연사 : 임미경 교수 (수리과학과), 김성용 교수 (해양시스템공학전공)
Speakers : Prof. Lim, Mikyoung (Dept. of Mathematical Sciences)
Prof. Kim, Sung Yong (Div.of Ocean Systems Engineering)
❏ Topic &Abstract:
▶Topic : Inverse problems and invisibility cloaking (Speaker: Prof. Lim, Mikyoung)
abstract: The aim of the invisibility cloaking is to hide an object from observation, and it has been actively studied since last decade. We first consider the inverse problem of identifying the material properties from boundary measurements. For the conductivity equation, this is known as the Calderon problem: “Is it possible to determine the electrical conductivity inside a region from the boundary voltage and current measurements?” The uniqueness for the Calderon problem holds when the conductivity is restricted to be isotropic, where the material properties are independent of direction. For the anisotropic case, the uniqueness fails to hold since it is possible to make, using a change of coordinates, two different anisotropic conductivity profiles that give the same boundary data. We will see how to make “Harry Potter’s invisibility cloak” using a singular change of coordinates that blows up a point to the region being cloaked. In addition, the regularization or the approximation of singular cloaking will be explained. Finally, I will provide a method of constructing very effective near-cloaking structures in order to achieve enhanced near-invisibility.
▶Topic : Inverse methods meet oceanography: Wind-current transfer function analysis (Speaker: Prof. Kim, Sung Yong)
abstract : This talk covers an aspect of inverse methods in oceanography. The statistical analysis using the transfer function (or impulse response function or Green's function) has a long history in the form of data analysis and signal processing in oceanographic and engineering communities. The impulse response function characterizes the whole system by generating a unique response to a given impulse. Thus, the observed relationship between forcing and response allows us to identify the system. For instance, the oceanic system forced by wind stress (forcing) generates currents (response) and their statistical characterization describes the wind-current system. On the contrary, the primitive equations governing the flow also describe the system with the interlocked dynamical components. As a similar example, the momentum equations in a rotating frame of reference well represent the linear relationship between wind stress and currents as their primary relationship. These two approaches using transfer functions and governing equations delineate the system in a different way.
❏ 간단한 점심식사를 준비할 예정입니다.
Refreshments will be served for free.
❏ 관련문의 / Inquiry
수 리 과 학 과 박이화 / Ext. 2702, firstname.lastname@example.org
해양시스템공학전공 이창훈 / Ext. 1502, email@example.com
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