• The Journal of Society for e-Business Studies
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• v.5 no.1
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• pp.55-73
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• 2000

Recently; EC(Electronic Commerce) is increasing with high speed based on the expansion of Internet. EC which is done on the cyber space through Internet has strong point like independence from time and space. On the contrary, it also has weak point like security problem because anybody can access easily to the system due to open network attribute of Internet. Therefore, we need the solutions that protect the security problem for safe and useful EC activity. One of these solutions is the implementation of strong cipher algorithm. NC(Nonpolynomial Complete) cipher algorithm proposed in this paper is good for the security and it overcome the limit of current 64bits cipher algorithm using 128bits key length for input, output and encryption key, Moreover, it is designed for the increase of calculation complexity and probability calculation by adapting more complex design for subkey generation regarded as one of important element effected to encryption. The result of simulation by the comparison with other cipher algorithm for capacity evaluation of proposed NC cipher algorithm is that the speed of encryption and decryption is 7.63 Mbps per block and the speed of subkey generation is 2,42 μ sec per block. So, prosed NC cipher algorithm is regarded as proper level for encryption. Furthermore, speed of subkey generation shows that NC cipher algorithm has the probability used to MAC(Message Authentication Code) and block implementation of Hash function.

• Proceedings of the Korea Contents Association Conference
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• 2005.11a
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• pp.428-432
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• 2005

This paper has studied the concept and technical factors of e-Learning system to which we intend to apply domestic biodiversity information. This article describes how we analyzed and designed the e-learning system to serve biodiversity information as e-Learning contents. It would be useful for the public and students if this information are organized and provided as e-learning contents especially in our country which has well-established network infrastructure considering the limited land space. It is expected that the establishment of e-Learning system based on this proposed design will help students and public to access and team biodiversity on cyber space.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2008.04a
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• pp.349-353
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• 2008

With the development of the internet and the spread of 'digital home', the communities in cyber space have been especially revitalized since the information-oriented society. Apartment houses provided networks that are well equipped with internet websites, which build up the houses as a virtual space unit. This study attempted to conducted the questionnaire research for apartment occupants in order to investigate their recognition of and participation in the virtual community and demand for the classified contents The results are as follows. 1) First of all, some easy-access programs are necessary to be groped while aggressive promotional strategies for virtual community that create interests of residents are required to make progress to increase the participation for virtual community 2) 'Gender', 'the form of ownership' and 'level of using the Internet' show significant differences in the case of 'needs in the like-minded people's association', the participation of residents that is induced by both online and offline can cause positive effects on community activity 3) Needs in community enrichment are generally high so that various contents development related to those are necessary. 4) Effects of virtual community on the residential community are on the whole affirmative.

• Journal of the Society of Disaster Information
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• v.11 no.4
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• pp.581-588
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• 2015

This study was conducted by utilizing simulation (FDS6) the fire characteristics of the flammable substances such as cable compartment of a small space in the EPS room type. In the partitioned space of a room EPS supply of oxygen does not facilitate the combustion of the upward-sloping curve, as in a standard fire curve is not observed. Simulation results in a situation where ventilation is limited to the heat release rate and smoke emission characteristics of the fire showed a complex and unstable form a repeating rise and fall. Fire time was longer than the fire load. Change in the smoke emission than the heat release rate is slow, but changes of the overall surface was found to exhibit affinity.

• Korean Institute of Interior Design Journal
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• v.15 no.4 s.57
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• pp.46-54
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• 2006

The present study examined Marcos Novak, a digital architect who has researched digital architecture and produced related works since the early 1990s. Starting from digital ideas originating from science and mathematics, he pursued 'trans architecture' based on the concept of 'architecture beyond the boundary of architecture' and 'architecture as invisible foundation.' His concept of 'trans architecture' is considered an important viewpoint in expressing the architecture of a diversified and hybridized age like today. The objective of this study was to understand the concepts of Allobio and Eversion, which are important digital terms forming the background of Novak's trans architecture, and to analyze architecture philosophy and architecture design concepts observed in his works through Novak's digital terminology centering on the concept of trans architecture pursued by him. Through this, we purposed to analyze the concept of architectural space, methods of form creation and the characteristics of trans architecture space, which were unique to Novak, the leader of digital architecture, and ultimately to provide basic materials on Novak. Novak's trans architecture represents digital architecture in the contemporary diversified and hybridized age, and his works involve various different digital elements and ideas, scientific paradigms, mathematic algorithms, 4 dimensional geometry, etc. In this sense, he is regarded as a prominent leading advocate of digital architecture.

• International Journal of Computer Science & Network Security
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• v.21 no.11
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• pp.135-142
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• 2021

The article reveals the essence of cybercrime, approaches to understanding this concept, classification of cybercrime, and other illegal acts in this area. The concept of cybercrime has multi-discourse nature and a certain legal uncertainty. Cybercrimes, their forms and types are analyzed in the economic context. The research vocabulary of the economic industry is defined. The scope and content of concepts denoted by the terms of the sphere covered by cybercrime are studied, and its types and forms are analyzed. The article studies problems, achievements, and prospects of resisting and combating cybercrime during the development of the civil information society and Ukraine's entry into the global information space. The study focuses on the economic motivation of most cybercrimes since some material benefit from the fact of cyber offenses is assumed directly or indirectly.

• Journal of the Korean association of regional geographers
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• v.20 no.4
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• pp.409-424
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• 2014

This study has analyzed the situation and space structure of Chungcheong Region using the variables of land prices. The total amount of land prices of Chungcheon Region was 950 trillion KRW as of December 2013, showing that it has increased by 6.46 times compared to 147 trillion KRW of 1980, which was the time of initial analysis. As a result of analyzing the dynamic changes in the region based on the land prices from 1980 through 2013, there were significant changes in the space structures only in the 1980s. The analysis of centrality based on the land prices of Chungcheong Region has shown that the center of Chungcheong Region was to the northeast of Sejong City in the 1980s and moved to the right with the rise in the land prices of Daejeon Region. The standard deviation of distance showed concentration around Daejeon entering the 1990s from the 1980s, and almost no concentration has been found after that.

• The Journal of the Korea Contents Association
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• v.12 no.6
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• pp.21-31
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• 2012

The virtual reality consists of a virtual space constructed similar to the reality and agents residing in it. Our virtual space refers to an orderly space that is governed by such physical properties as mass, gravity, friction, and associated rules on top of the usual visual rendering. To construct this virtual world we are to develop virtual agents behaving like humans and the environment surrounding them. In order to improve the existing reactive agents designed to act to their designers' dictation in predetermined space or memory into autonomous agents, we need diverse kinds of knowledge among others related to the spaces for the agents to act in. Our design and implementation focuses on the spatial knowledge among those diverse aspects of knowledge required. The developed knowledge representation scheme is used on a basis for realistic and efficient physical cyber-environment, and as the knowledge structure to simulate the virtual agents' knowledges on spaces.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.5
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• pp.11-22
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• 2010

Recently, Fan and Dai introduced a Shifted Polynomial Basis and construct a non-pipeline bit-parallel multiplier for $F_{2^n}$. As the name implies, the SPB is obtained by multiplying the polynomial basis 1, ${\alpha}$, ${\cdots}$, ${\alpha}^{n-1}$ by ${\alpha}^{-\upsilon}$. Therefore, it is easy to transform the elements PB and SPB representations. After, based on the Modified Shifted Polynomial Basis(MSPB), SPB bit-parallel Mastrovito type I and type II multipliers for all irreducible trinomials are presented. In this paper, we present a bit-parallel architecture to multiply in SPB. This multiplier have a space complexity efficient than all previously presented architecture when n ${\neq}$ 2k. The proposed multiplier has more efficient space complexity than the best-result when 1 ${\leq}$ k ${\leq}$ (n+1)/3. Also, when (n+2)/3 ${\leq}$ k < n/2 the proposed multiplier has more efficient space complexity than the best-result except for some cases.

• Journal of Environmental Impact Assessment
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• v.31 no.6
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• pp.438-448
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• 2022

This study is to improve the quantitative estimation index of biotop area ratio, which is an environmental planning index and environmental ecological planning technique, as a planning means that can induce the improvement of ecological soundness in the spatial planning stage. It is intended to identify the relative importance of space types and calculation indicators currently in operation, and to find alternatives through opinion analysis on improvement of space types and weights. As the method of this study, AHP analysis was performed to evaluate the relative importance of spatial types for in-depth analysis of spatial types and calculation indicators. In order to secure the reliability and objectivity of the study, 50 experts participated. Through this study, it can be linked with the improvement of technologies and construction methods, maintenance efficiency, economic feasibility, and construction technology, which are developed through analysis on the limitations and improvements by type of biotop area ratio. And it is expected to contribute to the improvement of the urban environment and vitalization of the biotop area ratio through the application of the biotop area ratio.