• 제목/요약/키워드: Control the Sphere

검색결과 136건 처리시간 0.037초

Trivariate B-spline Approximation of Spherical Solid Objects

  • Kim, Junho;Yoon, Seung-Hyun;Lee, Yunjin
    • Journal of Information Processing Systems
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    • 제10권1호
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    • pp.23-35
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    • 2014
  • Recently, novel application areas in digital geometry processing, such as simulation, dynamics, and medical surgery simulations, have necessitated the representation of not only the surface data but also the interior volume data of a given 3D object. In this paper, we present an efficient framework for the shape approximations of spherical solid objects based on trivariate B-splines. To do this, we first constructed a smooth correspondence between a given object and a unit solid cube by computing their harmonic mapping. We set the unit solid cube as a rectilinear parametric domain for trivariate B-splines and utilized the mapping to approximate the given object with B-splines in a coarse-to-fine manner. Specifically, our framework provides user-controllability of shape approximations, based on the control of the boundary condition of the harmonic parameterization and the level of B-spline fitting. Experimental results showed that our method is efficient enough to compute trivariate B-splines for several models, each of whose topology is identical to a solid sphere.

NC 공정기계에서 온더머신 오차측정 및 보상 (On the machine error measurement and compensation)

  • 신동수;정성종
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
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    • pp.1096-1101
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    • 1992
  • In order tominimize fixing error of workpieces, circle, prismatic, sphere, cylindrical and sculptures types. Modification Rule by Indexing Table and Modification Rule by NC Program are developed for machining centers by using touch trigger probes. The Modification Rule by Indexing Table meas the alignment of workpiece to NC program through degree of freedoms of indexing table. The Modification Rule by NC Program is the alognment of NC program to workpiece ste-tp condition via the generation of NC progarm. A postprocessing module is alos developed for generating NC-part program(User Macro) to compensate for machining errors in end milling and boring processes. Developed method are verified by experiments.

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텍스쳐 매핑과 파티클 시스템을 이용한 눈 내리는 전경의 애니메이션 (Animation of Snowy Scenery Using Texture Mapping and Particle Systems)

  • 이상락
    • 한국게임학회 논문지
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    • 제3권1호
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    • pp.3-9
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    • 2003
  • 본 논문에서는 텍스쳐 매핑과 파티클 시스템을 이용하여, 눈 내리는 장면의 애니매이션을 OpenGL로 구현하는 두가지 방법을 제시하고 이들의 실행 결과를 비교 분석하였다. 하나는 glPointSize()함수를 사용하는 것이고 또 다른 하나는 glutSolidSphere()함수를 사용하는 것이다. 실행 결과 전자가 후자보다 실행 결과가 빨라서 속도가 느린 PC나 내리는 눈의 개체 수가 많은 경우에 사용하기에 더 적절한 방법이라 생각된다. 또 전자의 방법을 이용한 구현 과정에서 눈의 모앙과 눈의 색깔의 제어가 서로 상충되는 사실을 발견하고 이미지를 조작하여 그것을 해결하는 방법을 제시한다.

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An Efficient Collision Queries in Parallel Close Proximity Situations

  • Kim, Dae-Hyun;Choi, Han-Soo;Kim, Yeong-Dong
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2005년도 ICCAS
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    • pp.2402-2406
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    • 2005
  • A collision query determines the intersection between given objects, and is used in computer-aided design and manufacturing, animation and simulation systems, and physically-based modeling. Bounding volume hierarchies are one of the simplest and most widely used data structures for performing collision detection on complex models. In this paper, we present hierarchy of oriented rounded bounding volume for fast proximity queries. Designing hierarchies of new bounding volumes, we use to combine multiple bounding volume types in a single hierarchy. The new bounding volume corresponds to geometric shape composed of a core primitive shape grown outward by some offset such as the Minkowski sum of rectangular box and a sphere shape. In the experiment of parallel close proximity, a number of benchmarks to measure the performance of the new bounding box and compare to that of other bounding volumes.

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뇌졸중환자의 희망 (The Hope of the Stroke Patients)

  • 김이순
    • 대한간호학회지
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    • 제27권1호
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    • pp.212-227
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    • 1997
  • Cerebrovascular diseases in Korea is an important health problem since mortality and mobidity have been increased rapidly. It marked the 2nd cause of specific death rates in 1993. The stroke causes physical function disorder due to hemiparalysis and emotional disorder, and stroke patients experience helplessness, powerlessness. sense of alienation and loss of hope. These feelings make the rehabilitation difficult because they lose the will of life. The subjects of the study were seven citizens who live in Pusan, are over 50 years old and belong to low income-level. The data were collected from Jan. to Sep. 1995. The researcher as a caregiver and volunteer made confidence of them and asked for their agreement on the purpose of the study. The subjects expressed their experience as openheartedly as possible. The analysis of the data was made through the phenomenological analytic method suggested by Giorgi, which is as follows ; as an unit of description which include the subject' expressions and the researcher's observation, it is examined the theme that express the hope experience with the subject's language(underlining), and the focal meanings are identified. The focal meaning is the crystalization of the theme, which is written in the language of the researcher. After intergrating the focal meaning and make the situated structural description as the meaning of the hope experience identified on each subject's point. After intergrating the situated structural description and make the general structural description as the meaning of the hope experience identified on total subject's point then the systemizing of the structure of the hope experienced phenomena and the flowing of the conciousness was researched. The conclusions of this study was as follows : The ten sources of hope which the subjects experienced were sorted as under 〈mutual relations to others : spouse, children, relatives, fellow believer. health professioner. associate patient group〉, 〈spiritual dependence〉. 〈recovery of physical function〉. 〈rumination of the past life〉, 〈expectation of the future〉. 〈economic power〉, 〈belief〉, 〈ability〉. 〈spontaneous participation〉 and 〈recovery of roles〉. Their hope was spoken out by the following two kinds of linguistics. First. the hope was expressed in the affirmative expression as follows : 〈 to be dependable〉, 〈to make efforts〉, 〈to keep under control〉, 〈to desire〉, 〈to be pleasant〉, 〈to be peaceful〉, 〈to be grateful〉, 〈to give help〉, 〈self-confidence. Courage〉, 〈to be happy〉, 〈to satisfy oneself〉, 〈to share with others〉, 〈to understand〉 and 〈to be affected, be impressed〉 Second, the hope was expressed in the negative on pression as under : 〈to be distressed〉, 〈to be uneasy〉, 〈to be sorry, be unsatisfied〉 〈despair〉, 〈to abandon〉, 〈to be fearful〉, 〈to suffer〉, 〈to bear a burden〉 〈to be confused〉, 〈to be solitary〉, 〈chest trouble〉, 〈to feel heavy〉 〈grief〉, 〈to be daunted〉, 〈to get angry〉, 〈to be uncomfortable〉, 〈to have something regretable〉 and 〈to feel guilty〉. And their hope was expressed by the following four behavioral expressions : 〈physical sphere〉, 〈psychological sphere〉, 〈social support sphere〉 and 〈spiritual sphere〉. The reaction patterns of their hope experience appeared in the following 4 coping method : 〈conquest type〉, 〈dependence type〉, 〈adaptation type〉 and 〈fate type〉. Finally, in the hope structure the sense of certainty don't always coexict with the sense of uncertainty, When the stroke patients try to search for the best quality of life, the senses of certainty and uncertainty make a continual cyclic system in the hope structure.

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소셜 미디어 관련 온라인 선거 공론장 규제체계 비교연구 (A Comparative Study on the Regulation System of Public Sphere in the Social Media Space During the Election Campaign)

  • 이동훈;류정호;정수영
    • 한국언론정보학보
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    • 제55권
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    • pp.74-99
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    • 2011
  • 본 논문은 소셜 미디어 중심의 인터넷 선거 공론장의 정치적 영향력을 긍정적으로 활성화하는 방안으로서 제도적 개선에 초점을 두고 이를 위한 방향성을 모색하는 데 목적을 두었다. 구체적으로는 현재의 선거 커뮤니케이션이 후보자 및 주류 미디어 중심으로 구조화됨으로써 실질적으로는 중심이 되어야 할 유권자가 소외된 상황이라는 문제의식에서 출발했다. 이를 위해 선거 공론장의 활성화를 위한 이론적 개념으로서 논쟁성과 개방성 측면에서 접근했으며, 우리나라를 포함해 영국, 미국, 일본 등 주요 국가의 소셜 미디어 관련 온라인 선거 공론장 규제법률에 대한 사례분석과 국내 관련 선거법률의 개정방향에 대한 전문가 심층설문조사를 실시했다. 결과를 보면, 사례분석에서는 국가들을 자유지향형, 제한적 자유지향형, 질서지향형 모델로 나눌 수 있었으며, 자유지향형에는 미국과 영국, 제한적 자유지향형에는 우리나라, 질서지향형 모델에는 일본이 해당됐다. 해외 사례분석을 토대로 국내 선거법 제59조, 제93조, 제82조의4, 제251조 등 소셜 미디어 관련 선거 공론장의 규제법률 개선방향을 묻는 심층설문을 실시했다. 결과에서는 선거법에서 소셜 미디어 선거 공론장의 활성화에 제한요인으로 지적되는 조항들에 대한 적극적인 개정의견이 많았다. 관련 전문가들은 모두 개정의 필요성과 소셜 미디어 등 온라인 선거 공론장의 변화를 수용하는 방향으로 개정할 것에 대해 동의했다. 구체적으로는 온라인 선거 공론장에서 선거운동기간 제한이 폐지되어야 하며, 소셜 미디어 등 대안적 선거 커뮤니케이션 채널이 다양해진 상황에서 지나친 후보자 보호주의적 관점의 법조항도 개선될 필요가 있다고 답했다. 선거법 제82조의4, 제251조 등의 후보자 보호 관련 조항들은 과거 조직 선거 및 매스 미디어 선거 패러다임에서는 적합했으나 선거 커뮤니케이션 채널이 다양화, 수평화, 분산화된 현 시점에서는 적합하지 않은 부분이 있다. 따라서 부작용이 최소화하는 방향에서 현행 선거 커뮤니케이션 환경의 변화를 수용하는 방향으로 조정될 필요가 있다.

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Compact AUV platform system designed for the experiment of underwater multi-agent development

  • Watanabe, Keisuke
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2005년도 ICCAS
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    • pp.2036-2041
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    • 2005
  • The underwater multi-agent technology has many potential for the various activities related to ocean development/conservation in the near future. For example, in such fields as water pollution investigation, aquaculture control, or coral reef research, we feel a growing need for a system that realizes underwater continuous monitoring in the wide rang e. In this case, the target monitoring area will be sliced planar hierarchically toward the depth as monitoring layers, and many AUVs arranged on each layer track the given trajectory and gather various environmental information continuously, with communicating each other in the layer or with other layers. To realize those systems we need to develop AUV multi-agent technologies. So we are now building basic systems for basin experiment for the development of AUV multi-agent behavior. We must experience many situations and problems to be solved for the development of its elemental technologies by using real systems as well as our computer simulations. In this paper we introduce our concept of the experiment in the near future and the hardware/software design of our two types of handy AUVs and ultrasound ranging/communication system for that experiment. One AUV is designed using a 17inches-diameter glass sphere with DOS/V and RT-Linux based subsystems, which is intended to use not only in the basin but also in the calm real sea. The other AUV is designed for the basin experiment using a 7inches-diameter acrylic sphere with low-cost embedded system with SH-2 based subsystems. The basin experiment to verify the basic AUV facilities and ultrasound ranging for position detection was carried out.

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전구체 비율에 따른 실리카-폴리메틸실세스퀴옥세인(PMSQ) 복합분체의 형태 제어 (Shape Control of Silica-Polymethylsilsesquioxane (PMSQ) Composites by Varying Ratios of Precursors)

  • 최이건;최종민;김효중
    • 대한화장품학회지
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    • 제45권4호
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    • pp.409-414
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    • 2019
  • 실리카와 폴리메틸실세스퀴옥세인(polymethylsilsesquioxane, PMSQ)은 화장품 원료로 널리 쓰이는 실리콘 분체이다. 본 연구팀은 각각 실리카와 PMSQ의 전구체로서 테트라에톡시실란(tetraethyoxysilane, TEOS)과 메틸트라이메톡시실란(methyltrimethoxysilane, MTMS)을 사용하여 졸-겔 법(sol-gel method)을 통해 실리카-PMSQ 복합분체를 합성하였다. 또한, 합성에 사용된 실란 단량체인 TEOS와 MTMS의 단순한 비율 조절만으로 복합분체의 형태 제어에 성공하였다. 실리카-PMSQ 복합분체는 구형, 라즈베리형, 도넛형, 총 3가지 형태를 띠었고, 공통적으로 사용감이 부드럽고 수분산에 용이하며 소프트 포커스 효과를 나타내었다. 복합분체의 형태에 따라서 사용감과 밀착력, 소프트 포커스 효과의 강도에 차이가 있었다. 라즈베리형 복합분체는 가장 강한 소프트 포커스 효과를 보였고, 도넛형 복합분체는 가장 강한 밀착력을 보였으며, 구형 복합분체는 가장 부드러운 사용감을 보였다. 본 연구 결과를 바탕으로, 실리카-PMSQ 복합분체를 원하는 형태로 간편하게 합성할 수 있을 것이다. 더 나아가, 목적에 맞는 복합분체를 선택하여 화장품에 적용할 수 있을 것이다.

Fast Computation of the Visibility Region Using the Spherical Projection Method

  • Chu, Gil-Whoan;Chung, Myung-Jin
    • Transactions on Control, Automation and Systems Engineering
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    • 제4권1호
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    • pp.92-99
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    • 2002
  • To obtain visual information of a target object, a camera should be placed within the visibility region. As the visibility region is dependent on the relative position of the target object and the surrounding object, the position change of the surrounding object during a task requires recalculation of the visibility region. For a fast computation of the visibility region so as to modify the camera position to be located within the visibility region, we propose a spherical projection method. After being projected onto the sphere the visibility region is represented in $\theta$-$\psi$ spaces of the spherical coordinates. The reduction of calculation space enables a fast modification of the camera location according to the motion of the surrounding objects so that the continuous observation of the target object during the task is possible.

실내 Design 에 있어서 빛의 조절과 연출기법에 관한 연구 -자연광 유입을 중심으로 (A Stud on control and representation skill of lighting- The main purpose is the inflowing of natural lighting-)

  • 김중근
    • 한국실내디자인학회논문집
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    • 제1호
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    • pp.72-75
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    • 1992
  • Lighting made interior space visible and to recognize space itself. Sp9ace and form are established not themselves , but lighting. and dextrous treatment of natural light accomplished poeteic space. Inflowing of lighting in interior space is main factor to decide space character and image . That was recognized in interior space through many centries. At this point, this study was described for that present inflowing of lighting adapting space character and right method in lighting program. The present study is to present the planning method of the most appropriate and the most rational natural lighting in planing for lighting. Under this premise the followings are made ; I. An introduction , the purpose, the sphere, and the method of this study are stated. II, The present writer studied the general characteristics of natural lighting. III. this author studied the factor of decision on control and representation skill of lighting along the following. IV. Analyzing interior space in which the natural lighting is introduced through some literature and case studies. Physics, psychology, structure, equipment, material. V. The last, the author rearranged the results of this study.

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