• Title/Summary/Keyword: space technology

Search Result 9,593, Processing Time 0.035 seconds

A Hierarchical Autonomous System Based Topology Control Algorithm in Space Information Network

  • Zhang, Wei;Zhang, Gengxin;Gou, Liang;Kong, Bo;Bian, Dongming
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.9 no.9
    • /
    • pp.3572-3593
    • /
    • 2015
  • This article investigates the topology control problem in the space information network (SIN) using a hierarchical autonomous system (AS) approach. We propose an AS network topology control (AS-TC) algorithm to minimize the time delay in the SIN. Compared with most existing approaches for SIN where either the purely centralized or the purely distributed control method is adopted, the proposed algorithm is a hybrid control method. In order to reduce the cost of control, the control message exchange is constrained among neighboring sub-AS networks. We prove that the proposed algorithm achieve logical k-connectivity on the condition that the original physical topology is k-connectivity. Simulation results validate the theoretic analysis and effectiveness of the AS-TC algorithm.

A Study on the Plan of Activation of Library by Utilizing the Virtual Reality and Augmented Reality

  • Noh, Younghee;Shin, Youngji
    • International Journal of Knowledge Content Development & Technology
    • /
    • v.12 no.1
    • /
    • pp.85-104
    • /
    • 2022
  • In this study, in line with the era of the fourth industrial revolution, general concepts, technologies, trends, and examples of virtual reality and augmented reality were examined, and based on this, a plan that could be applied to libraries in the future was proposed. As a result of the study, first, it is necessary to construct a smart space as an experiential play space that can satisfy cultural desires transcending time and space by providing immersive contents using 4th technology such as VR and AR. Second, it is necessary to expand experiential cultural support services through VR, AR and MR. Third, to develop educational contents based on augmented reality technology. In order to apply and activate virtual reality and augmented reality in libraries in the future, based on a survey of librarians and users of public libraries, a survey on the application status, satisfaction, and demand of current public libraries should be conducted.

Example of Legislation on the Space Relations of Every Countries in the World and Main Contents of the Space Exploration Promotion Act and Future Task in Korea (세계 각국의 우주관계 입법례와 우리나라 우주 개발진흥법의 주요내용 및 앞으로의 과제)

  • Kim, Doo-Hwan
    • The Korean Journal of Air & Space Law and Policy
    • /
    • v.20 no.1
    • /
    • pp.9-43
    • /
    • 2005
  • The Korean government established her first "National Space Program" in 1996, and revised it in 2000 and 2005. As embedded in the National Space Program, Korea aims to become one of the world's top countries in space technology by 2010. All of 13 satellites are planned to be put into orbit as schematized, which include 7 multi-purpose satellites, 4 science satellites and 2 geostationary orbit satellites. The Space Center in Korea is to be built at Woinara-Do, Bongrae-Myon, Koheung-Goon, Junlanam Province on the southern coast of the Korean peninsular. The first phase of the construction of the space center will be finished by 2007 for launch of KSLV-l. This will make Korea be the 13th advanced country in space development having a launching site in the world. The "Space Center" will serve as the infrastructure for the development of space technology and related technology, and plan to launch a low earth orbit satellite in 2007. A second science satellite made in Korea will be launched from the space center by 2007. From 2010, the center will be operated on a commercial basis operating launch facilities for low-to mid-altitude orbit satellites. Since the 'Aircraft Industry Promotion Act' was replaced by the 'Aerospace Industry Development Promotion Acf of 1987, this Act had been amended seven times from 1991 year to 2004. Most of developed countries has been enacted the space law including the public or private items such as an (1)DSA, (2)Russia, (3)the United Kingdom, (4)Germany, (5)France, (6)Canada, (7)Japan, (8)Sweden, (9)Australia, (10)Brazil, (11)Norway, (12)South Africa, (13)Argentina, (14)Chile, (15)Ukrainian etc. As the new Space Exploration Promotion Act was passed by the resolution of the Korean Congress on May 3, 2005, so the Korean government has made the public proclamation the abovementioned Act on May 31, this year. This Act takes effect on December 1, 2005 after elapsing six months from the date of promulgation. The main contents of Space Exploration Promotion Act of 2005 is as the following (1)establishing a basic plan for promoting space exploration, (2)establishment and function of national space committee, (3)procedure and management of domestic and international registration of space objects, (4)licensing of launch by space launch vehicles, (5)lability for damages caused by space accidents and liability insurance, (6) organizing and composition of the space accident investigation committee, (7)Support of non-governmental space exploration project, (8)Requesting Support and Cooperation of Space Exploration, (9)Rescue of Astronauts and Restitution of Space Objects, etc.. In oder to carry out successfully the medium and long basic plan for promoting space exploration and to develope space industry in Korea, I think that it is necessary for us to enlarge and to reorganize the function and manpower of the Space Technology Development Division of the Ministry of Science & Technology and the Korea Aerospace Research Institute. Korea has been carrying out its space program step by step according to the National Space Program. Korea also will continually strengthen the exchange and cooperation with all the countries in the world under the principle of equality, friendship relations and mutual benefits. Together with all other peoples around the globe, Korea will make due contribution towards the peaceful utilization of space resources and promotion of human progress and prosperity.

  • PDF

Public's Recognition of the Space Object's Re-entry Situations and the National Space Disaster Management Policy (우리나라 국민의 우주위험인식 수준과 국가 재난정책)

  • Kim, Syeun;Cho, Sungki;Hong, Jeongyoo
    • Journal of the Korean Society of Safety
    • /
    • v.31 no.6
    • /
    • pp.84-92
    • /
    • 2016
  • Since the mankind started its space mission, the number of artificial space objects has been increasing exponentially. It contains not just the space machines which are in use but the machines which are out of order. Meantime, those dead machines are being a serious danger, a real threat to human's lives and property because of it could re-enter into the earth's atmosphere and fall to the ground causing mega-disaster. As the number of space activities gets growing so far, the re-entry of the space objects will be a lot more happened in the future. Therefore, not just natural space object like asteroids but the artificial space object like artificial satellite and space station can cause the disaster by falling to the ground. To protect our nation and our property, the government has set up the space disaster management center in Korea astronomy and Space science Institute. In this study, we surveyed public's recognition of the space object's re-entry situation and analyzed it to contribute building national space disaster management policy.

CONVEXITY OF DISTANCE FUNCTION BETWEEN GEODESICS

  • Kim, In-Su;Kim, Yong-Il;Lee, Doo-Hann
    • Honam Mathematical Journal
    • /
    • v.30 no.2
    • /
    • pp.335-341
    • /
    • 2008
  • In this paper, we use the convexity of distance function between geodesics in a singular Hadamard space to generalize Hadamard-Cartan theorem for 2-dimensional metric spaces. We also determine a neighborhood of a closed geodesic where no other closed geodesic exists in a complete space of nonpositive curvature.

SEMIALGEBRAIC G CW COMPLEX STRUCTURE OF SEMIALGEBRAIC G SPACES

  • Park, Dae-Heui;Suh, Dong-Youp
    • Journal of the Korean Mathematical Society
    • /
    • v.35 no.2
    • /
    • pp.371-386
    • /
    • 1998
  • Let G be a compact Lie group and M a semialgebraic G space in some orthogonal representation space of G. We prove that if G is finite then M has an equivariant semialgebraic triangulation. Moreover this triangulation is unique. When G is not finite we show that M has a semialgebraic G CW complex structure, and this structure is unique. As a consequence compact semialgebraic G space has an equivariant simple homotopy type.

  • PDF

Construction of E-CALLISTO in KASI

  • Roh, H.S.;Cho, K.S.;Bong, S.C.;Monstein, Christian;Benz, Arnold O.;Moon, Y.J.;Kim, Sung-Soo S.
    • The Bulletin of The Korean Astronomical Society
    • /
    • v.32 no.2
    • /
    • pp.67.1-67.1
    • /
    • 2007
  • PDF

The first results of E-CALLISTO in Korea

  • Roh, Hee-Seon;Cho, K.S.;Bong, S.C.;Monstein, Christian;Benz, Arnold O.;Moon, Y.J.;S. Kim, Sung-Soo
    • The Bulletin of The Korean Astronomical Society
    • /
    • v.33 no.1
    • /
    • pp.42.2-42.2
    • /
    • 2008
  • PDF