• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.8
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• pp.3568-3584
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• 2016

In mobile opportunistic networks (MONs), human-carried mobile devices such as PDAs and smartphones, with the capability of short range wireless communications, could form various intermittent contacts due to the mobility of humans, and then could use the contact opportunity to communicate with each other. The dynamic changes of the network topology are closely related to the human mobility patterns. In this paper, we propose a social motivation-aware mobility model for MONs, which explains the basic laws of human mobility from the psychological point of view. We analyze and model social motivations of human mobility mainly in terms of expectancy value theory and affiliation motivation. Furthermore, we introduce a new concept of geographic functional cells, which not only incorporates the influence of geographical constraints on human mobility but also simplifies the complicated configuration of simulation areas. Lastly, we validate our model by simulating three real scenarios and comparing it with reality traces and other synthetic traces. The simulation results show that our model has a better match in the performance evaluation when applying social-based forwarding protocols like BUBBULE.

• Journal of the Korean Institute of Educational Facilities
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• v.23 no.2
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• pp.19-29
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• 2016

In the context of lifelong education program for an aging society and information age, elementary school facilities are expected to accommodate various people in diverse age group and diverse physical abilities. Introduction of the 'Universal Design' concept seems inevitable in school environment in terms of public infra structure for community. However, in architectural point of view, unlike foreign examples, simply applied barrier-free and safety standards of domestic guidelines based on dimensional data does not function enough to achieve universal design in authentic manner. This study is focused on this issue and suggests the direction of improvement for architectural design guidelines. Through the comparative analysis of foreign and domestic design guidelines, two principles of universal design-'Flexibility in Use', 'Perceptile Information'- are found to be lacking in the domestic design guidelines for elementary school facilities. It is expected for government authority to develop more concrete guidelines to achieve universal design for school as a basic public space in the community.

• Journal of Satellite, Information and Communications
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• v.9 no.3
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• pp.59-63
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• 2014

This paper describes the basic principles of 3D broadcast system and proposes new 3D broadcast technology that reduces the amount of data by applying CS(Compressed Sensing). Differences between Sampling theory and the CS technology concept were described. Recently proposed CS algorithm AMP(Approximate Message Passing) and CoSaMP(Compressive Sampling Matched Pursuit) were described. This paper compared an accuracy between two algorithms and a calculation time that image data compressed and restored by these algorithms. As result determines a low complexity algorithm for 3D broadcast system.

• Journal of the Korean Society of Clothing and Textiles
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• v.42 no.5
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• pp.753-768
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• 2018

This study reveals the aesthetic characteristics and formative characteristics of the converged images of romantic sportism by analyzing how sportism fashion and romantic images fuse together. As for research methods, this study examines the aesthetic and formative characteristics of sportism fashion and the aesthetic and formative characteristics of romantic styles after grasping the basic concept and background based on a literature study of romantic and sportism fashion. As for an empirical study, the styles of sportism fashion pictures of romantic images collected from 2010 S/S to 2016 S/S from www.vogue.com were analyzed. The study results showed that there are 4 aesthetic characteristics of romantic sportism in modern fashion that included 'non-oriented form visibility', 'non-boundary sensibility', 'multi-sense blend', and 'non-formal mixed usage'. The formative characteristics based on these aesthetic characteristics are also derived in accordance with design factors as well as analyzed through representative pictures.

• Journal of the Korean Society of Earth Science Education
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• v.8 no.3
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• pp.267-280
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• 2015

The purpose of this study is to identify the conceptions of middle school students and teachers about Visible-Light, Ultra-Violet(UV) and Infrared-Ray(IR). We administered questionnaire 3 teacher and 102 students(48 people of middle school 2nd students and 54 people of middle school 3rd students) who learned by 3 teachers in seoul. From the analysis, it was found that many students and teachers didn't understand the basic principle of UV and IR. Significant number of students belive that it is possible to see objects the absence of visible light. Most students belive that they can see objects in the presence of UV light alone. They think that "Light" is single concept. Teachers were generally more aware of the origin and explanation of UV. But teachers expressed some uncertainties. They tend to think negative effect for UV.

• Journal of the Korean Society of Propulsion Engineers
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• v.11 no.1
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• pp.57-63
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• 2007

The oxidizer-rich preburner is applied to the high efficiency closed cycle rocket propulsion system. This system is generally operated on oxidizer-fuel mixture ratio over than 50. The spray quality and mixing performance are very important for stable combustion of this preburner. This paper presents basic design concept and spray characteristic of the oxidizer-rich preburner injector and this result could be applied to the development of the oxidizer rich preburner system.

• Journal of East-West Nursing Research
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• v.7 no.1
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• pp.48-60
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• 2002

This study was conducted to understand and analyze experience of learning process support toward mothers of children who suffer from Cerebral Palsy, to generalize and structurize the meaning of practical learning process support, and to use the study results as basic materials for development of support model. Study subjects were 12 mothers who have Cerebral Palsy children attending an ordinary school and a school for handicapped children. Data were collected from November 10, 1999 to December 29, 2000 and from January 20 to March, 2001, for 2 months. Data were collected from un-structural and open questions. And the collected data were analyzed with the phenomenological analysis method proposed by van Kaam(1969). Study results obtained from this report were as follows; As for original materials about learning process support experience of cerebral palsy children's mothers, 48 technical expressions were derived from 97 pieces of original materials, they were categorized into 10 common elements. Those common elements were , , , , , , , , , . Based on the above results, it is suggested that the concept of learning process support toward children suffering from Cerebral Palsy should be structureized, and proper models should be developed.