Central Asia's Maritime Dimension? The Historical Position and Role of the Aral-Caspian Basin in the Modern Shaping of the Region

Bruno De Cordier 한국외국어대학교(글로벌캠퍼스) 러시아연구소 2019 REGION Vol.8 No.2

Central Asia is hardly associated with the sea and with maritime issues, even though its physical geography contains two major maritime surfaces, namely the Caspian Sea and the Aral Sea. This article looks into the position and role of these water surfaces and their respective littorals in the region’s integration and social transformation in the tsarist empire. It explores whether they were part of a maritime consciousness and the notion of overseas vis-à-vis Central Asia, before looking into a number of developments and shifts, the outcomes or at least traces of which are still prevalent and visible today. More concretely, these include: the patterns of maritime accessibility over the Caspian and Aral Seas that came into being and functioned; the existence of seashore-shaped cultures and livelihoods; and the establishment of new territorialities which served as spaces for double-edged economic modernization, blueprints of modern national individualities, and a peculiar pattern of urban development.

자기폐색 물체의 2D 커브로부터의 3D 모델링

코디에 프레데릭(Frederic Cordier),서혜원(Hyewon Seo),조영상(Young-Sang Cho) 한국정보과학회 2006 정보과학회논문지 : 소프트웨어 및 응용 Vol.33 No.9

본 논문은 2차원 평면상의 그림으로부터 3차원 물체를 복원하는 방법을 제시한다. 사용자가 입력하는 2차원 평면 그림은 3차원 물체의 윤곽선을 그린 것으로, 자신의 일부분이나 다른 물체에 의해 가려진 부분이 있는 윤곽선도 허용하는 것이 특징이다. 따라서, 복원된 3차원 물체 역시 자신의 일부, 혹은 다른 물체에 의해 가려진 부분이 존재할 수 있다. 본 논문에서 제안하는 방법은 2차원 윤곽선 분석, 3차원 골격 계산, 그리고 3차원 물체 복원의 세가지 단계로 구성된다. 본 논문의 주된 기여는 기여는 자신이나 다른 물체에 의해 가려진 2차원 윤곽선으로부터 3차원 골격을 계산하는 방법이며, 이를 위하여 일련의 최적화 문제를 정의하고 해결하였다. 최적화 문제는 골격의 생성, 물체의 충돌 제한, 그리고 C1 연속성 유지를 위하여 사용된다. 결과적으로, 제안된 방법은 기존의 실루엣 기반의 스케칭 인터페이스를 사용한 3차원 물체 모델링에 대하여, 상호 폐색 (가림/가려짐) 이 존재하는 형태에서도 허용되도록 확장하였다. In this paper, we propose a method for reconstructing a 3D object (or a set of objects) from a 2D drawing provided by a designer. The input 2D drawing consists of a set of contours that may partially overlap each other or be self-overlapping. Accordingly, the resulting 3D object(s) may occlude each other or be self-occluding. The proposed method is composed of three major steps: 2D contour analysis, 3D skeleton computation, and 3D object construction. Our main contribution is to compute the 3D skeleton from the self-intersecting 2D counterpart. We formulate the 3D skeleton construction problem as a sequence of optimization problems, to shape the skeleton and place it in the 3D space while satisfying C1-continuity and intersection-free conditions. Our method is mainly for a silhouette-based sketching interface for the design of 3D objects including self-intersecting objects.

A breast modeler based on analysis of breast scans

Seo, Hyewon,Cordier, Frederic,Hong, Kyunghi John Wiley Sons, Ltd. 2007 Computer Animation and Virtual Worlds (Print) Vol.18 No.2

<P>The advent of 3D scanning technology has allowed effective measurement and analysis of breast size and shape, attracting interests by plastic surgeons, brassier designers, etc. Much work remains, however, before 3D scanning systems can be successfully used in automated analysis and synthesis of the breast—filtering noise, filling holes, and, in case a statistical analysis is desired, finding correspondence among each scan data. Moreover, analysis of a sagged breast is difficult to obtain, due to occlusions. In this paper, we address the problems and specific issues of using 3D scan data for the analysis and synthesis of breast models. The goal of our work is to build a breast modeler which can help both surgeons and garment designers in analyzing breast volume and surface measurements. Given enough samples of scanned breasts, our modeler can generate highly realistic breast shape, with some expected and consistent variability. Copyright © 2007 John Wiley & Sons, Ltd.</P>

Constrained Texture Mapping using Image Warping

Seo, H.,Cordier, F. Blackwell Publishing Ltd 2010 Computer Graphics Forum Vol.29 No.1

<P>Abstract</P><P><I>We introduce in this paper a new method for smooth foldover-free warping of images. It allows users to specify the constraints in two different ways: positional constraints to constrain the position of points in the image and gradient constraints to constrain the orientation and scaling of some parts of the image. We then show how our method is used for texture mapping with hard constraints. We start with an unconstrained planar embedding of the target mesh calculated with conventional methods. In order to obtain a mapping that satisfies the user-defined constraints, we use our warping method to align the features of the texture image with those of the unconstrained embedding. Compared to previous work, our method generates a smoother texture mapping and offers higher level of control for defining the constraints.</I></P>

A Smoke Visualization Model for Capturing Surface-Like Features

Park, Jinho,Seol, Yeongho,Cordier, Frederic,Noh, Junyong Blackwell Publishing Ltd 2010 Computer Graphics Forum Vol.29 No.8

<P>Abstract</P><P><I>Incense, candle smoke and cigarette smoke often exhibit smoke flows with a surface-like appearance. Although delving into well-known computational fluid dynamics may provide a solution to create such an appearance, we propose a much efficient alternative that combines a low-resolution fluid simulation with explicit geometry provided by NURBS surfaces. Among a wide spectrum of fluid simulation, our algorithm specifically tailors to reproduce the semi-transparent surface look and motion of the smoke. The main idea is that we follow the traces called streaklines created by the advected particles from a simulation and reconstruct NURBS surfaces passing through them. Then, we render the surfaces by applying an opacity map to each surface, where the opacity map is created by utilizing the smoke density and the characteristics of the surface contour. Augmenting the results from low-resolution simulations such a way requires a low computational cost and memory usage by design.</I></P>

규칙성을 가진 벡터 텍스처 합성에 관한 연구

서재우(JaeWoo Seo),프레데릭 코디어(Frederic Cordier) 한국HCI학회 2007 한국HCI학회 학술대회 Vol.2007 No.2

벡터장 기반 변형기술을 이용한 이미지 와핑 방법 : 텍스쳐 매핑에의 응용을 중심으로

서혜원(Hyewon Seo),코디에 프레데릭(Frederic Cordier) 한국정보과학회 2009 정보과학회논문지 : 시스템 및 이론 Vol.36 No.5

본 논문은 Von Funck 외가 제안한 벡터장 기반 변형기술에 기반한 새로운 텍스쳐 이미지의 와핑 방법을 제안한다. 사용자는 텍스쳐 이미지와 텍스쳐매핑이 될 3차원 물체 표면에 두 가지 방법으로 제한조건을 지정할 수 있다: 위치 제한조건은 이미지 상의 특징점의 위치를 특정위치 (물체 표면의 대응하는 특징점 위치)로 제한하는 데 사용하며, 그라디언트 제한조건을 사용하려는 특징점 이미지의 일부분에 대한 방향과 스케일에 대해 제어가 가능하다. 이러한 제한조건으로부터 그에 대응하는 C1 연속인 속도벡터장을 이미지 공간 상에 구축하고, 구축된 벡터장을 따라 텍스쳐 이미지 상의 모든 픽셀들을 이동시킨 결과로써 최종 텍스쳐 이미지를 획득한다. 본 연구에서 구현한 텍스쳐 매핑 애플리케이션에서는 우선 대상 3차원 메쉬를 최소제곱 등각매핑(Least Squares Conformal Mapping) 방법을 사용하여 2차원 평면에 임베딩시킨다. 다음으로, 제안하는 이미지 와핑 방법을 적용하여 텍스쳐 이미지 상의 특징점이 임베딩된 메쉬의 대응하는 특징점과 일치되도록 하여 최종 텍스쳐맵을 획득한다. 이와 같은 벡터장기반 방법을 통해 기존의 텍스쳐매핑 방법보다 더욱 부드러운 이미지 와핑결과를 얻을 수 있었으며, 왜곡이 많이 생기는 요구조건을 만족하면서도 자기 오버랩이 생기지 않는 좋은 성질을 보임을 확인하였다. We introduce in this paper a new method for smooth foldover-free warping of images, based on the vector field deformation technique proposed by Von Funck et al. It allows users to specify the constraints in two different ways: positional constraints to constrain the position of a point in the image and gradient constraints to constrain the orientation and scaling of some parts of the image. From the user-specified constraints, it computes in the image domain a C1-continuous velocity vector field, along which each pixel progressively moves from its original position to the target. The target positions of the pixels are obtained by solving a set of partial derivative equations with the 4th order Runge-Kutta method. We show how our method can be useful for texture mapping with hard constraints. We start with an unconstrained planar embedding of a target mesh using a previously known method (Least Squares Conformal Map). Then, in order to obtain a texture map that satisfies the given constraints, we use the proposed warping method to align the features of the texture image with those on the unconstrained embedding. Compared to previous work, our method generates a smoother texture mapping, offers higher level of control for defining the constraints, and is simpler to implement.

매개변수로 제어가능한 운전자의 안전벨트 뻗침 모션 생성

서혜원(Hyewon Seo),코디에프레데릭(Frederic Cordier),최우진(Woo-Jin Choi),최형연(Hyung-Yun Choi) (사)한국CDE학회 2011 한국CDE학회 논문집 Vol.16 No.4

In this paper we present our work on the parameterized construction of virtual drivers" reach motion to seat belt, by using motion capture data. A user can generate a new reach motion by controlling a number of parameters. We approach the problem by using multiple sets of example reach motions and learning the relation between the labeling parameters and the motion data. The work is composed of three tasks. First, we construct a motion database using multiple sets of labeled motion clips obtained by using a motion capture device. This involves removing the redundancy of each motion clip by using PCA (Principal Component Analysis), and establishing temporal correspondence among different motion clips by automatic segmentation and piecewise time warping of each clip. Next, we compute motion blending functions by learning the relation between labeling parameters (age, hip base point (HBP), and height) and the motion parameters as represented by a set of PC coefficients. During runtime, on-line motion synthesis is accomplished by evaluating the motion blending function from the user-supplied control parameters.

Trap states analysis in AlGaN/AlN/GaN and InAlN/AlN/GaN high electron mobility transistors

S. Latrach,E. Frayssinet,N. Defrance,S. Chenot,Y. Cordier,C. Gaquiere,H. Maaref 한국물리학회 2017 Current Applied Physics Vol.17 No.12

The paper deals with trap effects in InAlN/AlN/GaN and AlGaN/AlN/GaN high electron mobility transistor structures using frequency dependent conductance and High-Low frequency capacitance analysis. We performed a comparative study on electrical characteristics of electron devices. Capacitance-voltage characteristics revealed hysteresis with a voltage shift that was attributed to the accumulation of charges at the InAlN/AlN and AlGaN/AlN heterointerfaces. Using a simple extraction method, a rather low density of trapped charges is evaluated. On the other hand, bias and frequency dependent measurements are carried out in the vicinity of threshold voltage to determine the interface trap density Dit, trap time constant tit and trap state energy position ET. It is found that device with InAlN barrier exhibits high trap state densities in the range of 1012 -1014 cm2eV1, approximately one order of magnitude larger than with AlGaN barrier.

Measurement of the In-MediumK0Inclusive Cross Section inπ−-Induced Reactions at1.15 GeV/c

Benabderrahmane, M. L.,Herrmann, N.,Wiś,niewski, K.,Kecskemeti, J.,Andronic, A.,Barret, V.,Basrak, Z.,Bastid, N.,Buehler, P.,Cargnelli, M.,Č,aplar, R.,Cordier, E.,Deppner, I.,Crochet, P.,Dup American Physical Society 2009 Physical Review Letters Vol.102 No.18

<P>The K0 meson production by pi(-) mesons of 1.15 GeV/c momentum on C, Al, Cu, Sn, and Pb nuclear targets was measured with the FOPI spectrometer at the Schwer-Ionen-Synchrotron accelerator of GSI. Inclusive production cross sections and the momentum distributions of K0 mesons are compared to scaled elementary production cross sections and to predictions of theoretical models describing the in-medium production of kaons. The data represent a new reference for those models, which are widely used for interpretation of the strangeness production in heavy-ion collisions. The presented results demonstrate the sensitivity of the kaon production to the reaction amplitudes inside nuclei and point to the existence of a repulsive KN potential of 20+/-5 MeV at normal nuclear matter density.</P>