• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.12
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• pp.3708-3714
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• 2009

Recently, most of information services are provided by the computer network, since the technology of computer communication is developing rapidly, and the worth of information over the network is also increasing with expensive cost. But various attacks to quietly intercept the informations is invoked with the technology of communication developed, and then most of the financial agency currently have used OTP, which is generated by a token at a number whenever a user authenticates to a server, rather than general static password for some services. A 2-factor OTP generating method using the OTP token is mostly used by the financial agency. However, the method is vulnerable to real attacks and therefore the OTP token could be robbed and disappeared. In this paper, we propose a 3-factor OTP way using HMAC to conquer the problems and analyze the security of the proposed scheme.

• Cross-Cultural Studies
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• v.26
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• pp.297-319
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• 2012

We all know how beautiful our wild and it's importance to our living planet Earth. But did you realise the speed at which man himself is damaging it's unique natural habitat. We are well on our way to destroy our forests, plants, wetlands. We are polluting our oceans and seas. This way, we're driving numerous animal species, plant species and many others into extinction. Everyone should be aware of the importance of our natural environment. We live in the period of echocide. Why we need nature to survive and how we can deal with the environmental problems we face. This paper has the purpose to reform city's environment. Because, Metropolis and megalopolis are the principal cause of environmental disruption. To reform the city is needed to consider digital technology in our age. In the face of economic and cultural globalization, many have argued that we live an increasingly placeless world. However, as a growing number of cities participate and compete in key marketplaces of advanced capitalism, the spectacle of the city is more than ever a significant medium of communication in its own right. In doing so, this work is focused specifically on the dimension of city's media environment. To that end, the paper examined U-City and U-Eco city. In this study, we will introduce the study on model of U-Eco City as one way for the eco-freindly future city.

• Journal of the Korea Society for Simulation
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• v.19 no.2
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• pp.137-145
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• 2010

This study presents an RTS(Real-time Traffic System) based on an LBS(Location Based Service) using 5.8~5.9GHz RSU(Road Side Unit). The proposed LBI(Location based Broadcast system on ITS) is a local information-based service supported by RSU for drivers, which has a feature of convergence between T-DMB system and ITS-based RTS. The convergence of local broadcasting station and ITS is realized by two-way communication and supports LBS(Location Based Service) by identifying of vehicle's location using RSU. Real-time information delivery and various services could be provided by information exchanges between LMM and local broadcasting stations. Furthermore, conventional technical limitations have been solved mutually such as transmission area limitation in RTS and one-way communication problem in T-DMB. This support real-time two-way communication to each driver. Therefore, it can be expected that traffic dispersion effects and services expansion for drivers by RTS and LBI. Finally, it is proposed to built and implement test-bed around institute.

• Journal of Korean language education
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• v.25 no.1
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• pp.203-234
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• 2014

This paper demonstrates how to incorporate the teaching of communication strategies into a large class of English-speaking learners of the Korean language. The method proposed here was developed to overcome the difficulty of conducting language activities involving communicative interactions amongst students and also between teacher and students in a large classroom. As a way of compensating the minimal opportunities for interactions in the classroom, students are given the task of expressing in Korean the English translations of authentic Korean comics via Twitter, which was later replaced with the feedback feature on Moodle, and then their Korean expressions are collected and projected onto a big screen. These collected expressions by students naturally differ from one another, helping students to realize that it is possible for them to express the same message or meaning in many different ways. The results of two separately conducted questionnaires show that this method is an effective way of providing students with significantly increased chances of producing 'comprehensible output' that requires them to think of how to communicate with their limited knowledge of the Korean language. Many students also commented that the teachers' feedback on errors provides them with the opportunity to learn about common errors as well as their own errors.

• Fire Science and Engineering
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• v.27 no.1
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• pp.60-65
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• 2013

From an accident at 2:00 a.m. in November 2nd, 2012 that one fire-fighter died while suppressing the E land World Inc. Fire in Bupyeong-Gu, Incheon, we concluded the problem and the improvement method of using the wireless communication (the two-way radio) that the fire safety officer and the safety crew use when identifying the safety of the fire scene. And after the investigation, we could find that the communication between the fire safety officer and the safety crew was difficult in the scene of the fire by voice because of much noise, so they could rely solely on the wireless communication. Therefore, we investigated the wireless communication and its frequency now used in Incheon Fire Safety Devision. Also, we compared with those of the military and the police. As a result, by making use of the wireless communication and its frequency currently possessed in Incheon Fire Safety Division, we found that the fire safety officer and the safety crew rescuing people at the risk of their own life in the various fire scene can communicate effectively.

• The Journal of the Acoustical Society of Korea
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• v.16 no.2E
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• pp.14-20
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• 1997

The future teleconferencing systems will need an appropriate system which controls properly the acoustic echo for the convenient communication. The conventional acoustic echo cancellation algorithms involve large adaptive filters identifying the impulse response of the echo path. The use of adaptive IIR filters appears to be a reasonable way to reduce computational complexity. Effective cancellation of acoustic echo presented in teleconferencing system requires that adaptive filters have a rapid convergence speed. One of the main problems of acoustic echo cancellation techniques is that the convergence properties degrade for an highly correlated signal input such as speech signals. By the way, the introduction of linear prediction filers onto the structure of the acoustic echo cancellation represents one approach to decorrelate the speech signal. And variable step-size LMS algorithm improves the convergence speed through a little increasing of computational complexity. In this paper, we applied these two methods to the acoustic echo canceller(AEC) and showed that these methods have better performances than the conventional AEC.

• Journal of Science of Art and Design
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• v.2
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• pp.90-127
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• 2000

The Paper aims to survey and analyze the meaning 'Absence of body' from clothes as non-verbal communication medium. Two types of absence of body from clothes are clothes as object because of removing body, and flattened colthes to deny the body form. In results of analysis, 1)the confrontation of male/female was represented by positive/negative, active/passive, present/absent. 2) male/female means social/private, body/clothing, relevant/irrelevant, subjective/additive. 3) one/numbers, simple/various, limited/free present the various way of waering. 4) tradition/contemporary is expressed by materials 5) enlarged clothes expresses the cynical attitude about body 6) inside/outside , one dress/layered dress suggest new concept to wear against traditional way of wearing.

• Journal of Korea Society of Industrial Information Systems
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• v.15 no.4
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• pp.1-5
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• 2010

To operate safely VANET applications, authenticaton is necessary to identify val d participants and prevent malicious parties from modifying messages. This paper proposes an efficient authentication protocol for the vehicle registration in VANET environment. The topology of VANET changes rapidly due to high-speed movement of vehicles, thus it is need to reduce the computational burden of the authentication protocol. Therefore, this protocol uses only one-way hash functions and EOR operations to register vehicles.

• Journal of Korean Academy of Nursing Administration
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• v.21 no.4
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• pp.426-434
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• 2015

Purpose: The purpose of this study was to identify the relationship among the factors of self-awareness, other-awareness and communication ability, and how they relate to communication ability in nursing students. Methods: For data collection 237 nursing students completed self-report questionnaires. Data were analyzed using independent t-test, one-way ANOVA, Pearson correlation coefficients, and stepwise multiple regression. Results: Self-awareness, other- awareness and communication ability of the participants showed moderate levels of self-awareness, other-awareness, and communication ability. There were significant positive correlations between self-awareness and communication ability (r=.59, p<.001). and between other-awareness and communication ability (r=.22, p=.001). Social anxiety, private self-awareness, and internal other-awareness were significant factors, which explained about 37% of the variance in communication ability. Conclusion: These findings suggest that a systematic and effective curriculum focused on self-awareness and other-awareness should be developed for nursing students in order to promote their communication ability.

• Korean Journal of Human Ecology
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• v.14 no.6
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• pp.925-936
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• 2005

The purpose of this study was to investigate the levels of the adolescents' self-concept, communication, and conflict with parents, and to examine relationship between adolescents' conflict and their communication. This study also investigated the effect of the conflict and the communication on their self-concept. 179 second graders of 3 middle schools and 182 6th graders of 2 elementary schools of East Jeonnam were selected as the subjects. The questionnaires for the communication and the conflict between the adolescents and the parents and the self-concept inventory were used. The data were analyzed by regression analysis, t-test, paired-t-test, one way ANOVA and Duncan analysis. First, mother was better than father in the communication with the adolescent. The conflicts with the parents were as shown below in order; the homework, school record, sibling relationship, playing computer games, etc.. The adolescents' self-concept was above the median. Second, the adolescents' conflicts and communications with parents were negatively correlated. Third, there was a difference in the adolescents' self-concept according to the conflict with the parents. Fourth, the adolescents' self-identity was influenced by the communication with the parents. Their self-acceptance was highly influenced by the conflict and the communication with the parents. Their self-behavior was influenced by the communication with the parents.