• Journal of the Institute of Convergence Signal Processing
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• v.19 no.4
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• pp.153-161
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• 2018

This paper describes the performance improvement of Software (SW) digital filter using GPU (Graphical Processing Unit). The previous developed SW digital filter has a problem that it operates on a CPU (Central Processing Unit) basis and has a slow speed. The GPU was introduced to filter the data of the EAVN (East Asian VLBI Network) observation to improve the operation speed and to process data with other stations through filtering, respectively. In order to enhance the computational speed of the SW digital filter, NVIDIA Titan V GPU board with built-in Tensor Core is used. The processing speed of about 0.78 (1Gbps, 16MHz BW, 16-IF) and 1.1 (2Gbps, 32MHz BW, 16-IF) times for the observing time was achieved by filtering the 95 second observation data of 2 Gbps (512 MHz BW, 1-IF), respectively. In addition, 2Gbps data is digitally filtered for the 1 and 2Gbps simultaneously observed with KVN (Korean VLBI Network), and compared with the 1Gbps, we obtained similar values such as cross power spectrum, phase, and SNR (Signal to Noise Ratio). As a result, the effectiveness of developed SW digital filter using GPU in this research was confirmed for utilizing the data processing and analysis. In the future, it is expected that the observation data will be able to be filtered in real time when the distributed processing optimization of source code for using multiple GPU boards.

• Journal of Institute of Control, Robotics and Systems
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• v.13 no.4
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• pp.365-370
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• 2007

This paper studies an automation problem of a heating, a ventilating, and an air conditioning (HVAC) for the development of smart space. The HVAC system is described by the fuzzy system for the stability analysis and the controller design. The linear matrix inequalities (LMIs) conditions are derived for the stabilization problem of the closed-loop system under the analog control. Also, it is required to digitally redesign the pre-designed the analog HVAC control system in order to accomplish the remote control via web. It is shown the this digital redesign problem can be converted to the convex optimization problem with the LMI constraints. An example is provided to show the effectiveness of the proposed method.

• Journal of the Korean Institute of Intelligent Systems
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• v.15 no.1
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• pp.36-41
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• 2005

The smart space is composed of the wire and/or wireless network, multi-sensor-based environment, and many various controllers. For the smart space, this paper presents a new design method of multirate digital decentralized controller using the digital redesign technique. In specific, the proposed method is based on the delta-operator and the multirate sampling and takes the form of the LMIs. To shows the feasibility of the suggested method, the computer simulations for HVAC system are provided.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.9
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• pp.909-917
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• 1992

This paper proposes the realization of state-space digital filters with minimum output error variance. The algorithm is transforms of controllability and observability gramian in linear time invariant systems by weighted function and can improve performance of the digital filters by reducing the put error variance for state space coeffient variation. A numerical example shows that algorithm structure has much lower output error variance than that of other four structures(canonical, parallel, statistical sensitivity, balanced).

• Archives of design research
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• v.18 no.1 s.59
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• pp.115-124
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• 2005

Fast developing digital technology is Having an enormous societal influence, creating a porous new world without boundaries. This phenomenon applies to a whole range of fields, including culture, politics and even our daily lives. Urban Street cannot be excluded from this world-transforming change. Digital technology is changing the physical structure, growing patterns, function and role of the Urban Street. As a result, Urban Street should now be freeing themselves from the old-world functionalism, which has been pursued uniformly under the names of rationality and efficiency. We have, then, to think about the culture of the Digital Urban Street,'that is, the digital life style, which is tangibly generated in the concrete city space, and which must be prepared for further digitalization. This paper argues that the street must be understood as a communications centre, because digital technology has created a new communications style. Also, this paper focuses on how the physical environment of Urban Street will evolve with regard to both function and appearance. In conclusion, studying the ubiquitous space, it also looks at how existing urban planning and space design should lead to the further development of Urban Street using digital technology, as well as to the role this technology will have in the future.

• Proceedings of the Korea Society of Design Studies Conference
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• 2002.05b
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• pp.192-193
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• 2002

• Magazine of korean Tunnelling and Underground Space Association
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• v.25 no.3
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• pp.73-97
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• 2023

• Magazine of korean Tunnelling and Underground Space Association
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• v.21 no.4
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• pp.73-79
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• 2019

• Korean Institute of Interior Design Journal
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• v.20 no.5
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• pp.114-124
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• 2011

The development in modern world media made information expansion and conversion much easier. These changes in media environment required a lot of companies to quickly respond to the overall environment and come up with new appropriate marketing strategies. Companies use experiential exhibition halls to enhance their images. The goal of the research is to set the basis for digital signage exhibition production characteristics as a spatial mechanism by presenting the need to use the digital signage as a tool. Digital signage expands senses and connects internal and external space. There are many types of digital signage (display, projection, special media, etc) and they are informative, aesthetic, inductive, and amusing. For research methods, Korean companies' exhibition halls sample analysis and surveys were executed to analyze the awareness, expression characteristics, effects, and usage status of digital signage. In conclusion, corporate exhibition halls should: 1. be an interesting and comfortable space that can be used as a communication tool between the company and consumers 2. increase corporate potentials and faith by expanding human senses and inducing new experiences 3. continue to capture the interest of spectators through diversity.

• Journal of The Korean Digital Architecture Interior Association
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• v.11 no.1
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• pp.73-81
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• 2011

The purpose of this research is to analyze the emotional characteristics of community space with recently constructed apartment complexes. The designated subjects of this research are located in Dongtan the first New Town, with 500 to 1000 households and constructed as single buildings for community space are 14 apartment. The results are as follows: 1)The space for day care planned for children's emotional comfort and stability measured by symbolizing image of nature. Also, allowing children to recognize their own space by decorating the walls with the works of themselves and their friends was shown to break down extraneous feelings against other spaces, and allow intimacy for spaces. 2)The space for the aged was shown to give a secure and friendly feeling by considering the psychological and physical traits of the elderly. It can replenish the depressed bodies of aged people with vigor and stimulate their emotion. 3)The space for indoor exercise utilized various visual facilities, such as graphics and images, to bring out specific areas and create affiliation in stimulating the emotion of residents.