• Journal of Aerospace System Engineering
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• v.17 no.4
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• pp.58-66
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• 2023

The latest global issues are the Space economy and low-orbit Space communication. 3GPP announced Release 17 standardization in June 2022, and in this regard, the United States prepared a strategy to enhance the competitiveness of the low-orbit 5G-NTN Space industry, and create an ecosystem at the national level in March 2023. Global smartphone semiconductor manufacturers have announced the development and verification results of standard-based chip technology, and satellite communication operators are launching low-orbit 5G-NTN Space communication services and rate products through convergence between terrestrial communication networks. This study diagnoses the current status of Korea's low-orbit 5G-NTN space communication ecosystem. We present our ecosystem creation strategy in terms of fair competition in the market, the service legal system, and the national R&D governance system.

• Bulletin of the Korean Space Science Society
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• 2006.04a
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• pp.105-106
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• 2006

• Journal of information and communication convergence engineering
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• v.4 no.2
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• pp.62-66
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• 2006

The objective of this thesis is to measure the limit of the real space where wireless Local Area Network (LAN) is used, and to apply this result as reference to set up a real Wireless LAN environment. The organized circumference was composed of Wireless LAN based on IEEE 802.11b of the American standard, and the examination is carried out on the campus. On the real condition of office environment and open space, the ratio of available distance to a signal at each distance was measured and this result was studied as data to embody wireless LAN on the campus. The measurement under an indoor environment was executed under circumstance having two walls and open space, however, was executed respectively under three circumstances: Where no obstacle, where one wall exists, and where two or more walls exist.

• Bulletin of the Korean Space Science Society
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• 2006.10a
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• pp.169-169
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• 2006

• Korean Institute of Interior Design Journal
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• v.13 no.6
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• pp.175-183
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• 2004

As the information-oriented society makes progress, the role of Image has much influence on human being in space as a medium for information delivery and a means of artistic communication. These influences are appeared as expressional characteristics of the image such as the reproducibility of reality and unreality in the real world, the synchrony of expression of time, visual formality, a sign and the transmission of moaning. For these, the investigator examined the meaning of image in aspace, taking into consideration of the interrelationship of image, space, and human being. As study findings show, the expressional characteristics of image in space have such visual effects as a space in which pictorial formality and object exists, in which the mutual understanding of communication exists, and that realizes immaterial membrane in the aspect of time and space, according to the electronic light, color, and formation of the image media. In addition, it become clear that the characteristic could be staged on various circumstances by constructing the relationship between an object and a point of time interactively with bidirectional communication through combining technology and art. This suggests that the image develops as the form of sensory communication via interacting of space and human being.

• Bulletin of the Korean Space Science Society
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• 2004.10b
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• pp.55-55
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• 2004

• Bulletin of the Korean Space Science Society
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• 2004.10b
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• pp.58-58
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• 2004

• Journal of the Korean housing association
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• v.26 no.3
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• pp.25-32
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• 2015

Apartment complex has become the major residental type of the urban structure. apartment complex has started to equip various subsidiary welfare facilities recently. environmental planning for play space has especially been important due to the growing attention over children's emotional development. In this study, arrangement types for play spaces in apartments to invigorate communication had been analyzed focusing on physical environment. based on previous studies, the arrangement of subsidiary welfare facilities can be categorized into dispersal type, concentrative type, affiliated type, and affiliated concentration type, and the elements to invigorate communication consist of circulative elements which contain location of play space and affiliated facility, visual elements which contain visual openness, and social elements which draw arrangement types of benches. the result of the analysis devide the arrangement type into concentrative type, affiliated type, and affiliated concentration type. referring to the location of play space, the first, if it is situated outside of apartment complex, theme-centered play space can be equipped to invigorate communication, the second, if it is situated in the center of the complex or outside of the apartment complex, low fence can be applied for free sight, and the last, straight type of bench arrangement should be used in big scale play space, aspectant type and gazebo type of the arrangement can be situated only outside of complex. This research could serve as a baseline of physical environment analysis to invigorate communication for play space in apartment complex.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.66 no.1
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• pp.48-52
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• 2017

This paper proposes a hybrid algorithm of space-time block coding and space-frequency block coding using alternate time switch. The traditional alternate time-switched space-time or space-frequency block coding technique for orthogonal frequency division multiplexing system does not provide a good performance with a variety of communication environments. This hybrid algorithm has searched good performance ranges in various environments in view points of mobile speed and doppler frequency. In this paper, we investigate better performance ranges for two algorithms, suggest a hybrid algorithm for dynamically changing communication environments, propose a structure for transmitter and receiver, and show that its performance is better than the traditional algorithm by simulations.

• Electronics and Telecommunications Trends
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• v.38 no.2
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• pp.85-95
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• 2023

Space optical communication technology capable of large-capacity, high-speed, and low-latency communication can reduce the size, weight, and power consumption of radio frequency communications in existing satellite systems, thereby reducing launch costs, accommodating additional science instruments, and extending lifetime. Despite the high technical difficulty, various projects are being carried out in advanced countries regarding space technology for use in national security and defense, earth observation, and space communications. We review the advantages, key components, and development trends of space optical communication technology, which is attracting attention in applications such as satellite communications, intersatellite linking, and deep space communications.