• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.4
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• pp.733-738
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• 2005

The distress communication system in the maritime mobile service had almost depended on the wireless telephony or telegraphy technique. The GMDSS (Global Maritime Distress and Safety System) which was introduced in 1992 brought a lot of changes in the maritime distress communication service such as the automatic transmission of distress signals and implementation of global search and rescue networks. However, there are some deficiencies in the GMDSS distress communication system such as a lack of compatibility in the maritime distress communication between CMDSS ships and Non-GMDSS ships, increasing deceptive or false distress alerts generated by GMDSS installations, lack of understanding about the CMDSS installations for the operators. In this paper, the problems of distress communication system in the maritime mobile service are analyzed and the methods to solve or minimize these problems are suggested.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.910-913
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• 2007

Information society, introduced by the rapid progress of computer technology and communication technology, has brought us the comfort and prosperity on every aspect of human life. However, the adverse and harmful effects of it, including the ethics problems, turn out to be serious. Concerning these problems, purpose of this study is set to investigate the actual state of ethics awareness on information and communication, since ethics awareness is required more urgently than ever in this era of technology. While adolescents, who will lead the future society, comprise the majority of internet usage population in our nation, they are exposed to the harmful and risky contents in the periods during which their world view would be established. Furthermore, the problems emerging in the progress towards information-oriented society are jeopardizing the dignity and inherent value of human being, therefore causing the serious moral chaos and social problems. In this paper, the awareness level of middle school students in Gwangju City has been investigated especially in the aspect of information and communication. Based on the results, it is revealed that the efforts of government, social organization, students' parents as well as the education circles are essential. Also the proposal for improvement on the awareness level has been presented.

• Korean journal of communication and information
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• v.21
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• pp.35-62
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• 2003

This study is conducted to achieve following two purposes. First, this study investigates domestic conditions and problems of data broadcasting industry. Second, this study suggests the improving way of the legal and administrative systems in order to promote domestic data broadcasting industry. Survey was conducted with 16 companies and a few business men for gaining data of general condition and analyzing problems about domestic data broadcasting industry. The results are as follow: first, domestic industry was suffering from the lack of man power, finance, and the delay of data broadcasting service schedule. Second, respondents argued there was no the legal basis and the systematic regulation under the current digital broadcasting policy of government. To resolve those problems, this paper proposed the making laws preparing for the fusion service of communication and broadcasting, systematic assistance of government, the way of technology development and technical standardization, and the way of constructing infrastructure and cultivating man power.

• Journal of Elementary Mathematics Education in Korea
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• v.10 no.1
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• pp.43-66
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• 2006

This study was proposed to analyze mathematical communication activity and mathematical attitudes while students were solving project problem and to consider how the conclusions effects mathematics education. This study analyzed through qualitative research method. The questions for this study are following. First, how does the process of the mathematical communication activity proceed during solving project problem in a small group? Second, what reactions can be shown on mathematical attitudes during solving project problem in a small group? Four project problems sampled from pilot study in order to examine these questions were applied on two small groups consisting of four 5th grade students It was recorded while each group was finding out the solution of the given problems. Afterward, consequences were analyzed according to each question after all contents were noted. Consequently, conclusions can be derived as follows. First, it was shown that each student used different elements of contents in mathematical communication activity. Second, during mathematical communication activity, most students preferred common languages to mathematical ones. Third, it was found that each student has their own mathematical attitude. Fourth, Students were more interested in the game project problem and the practical using project problem than others.

• Journal of the Institute of Convergence Signal Processing
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• v.9 no.1
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• pp.82-88
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• 2008

In this paper, Runge-Kutta (RK)-Butcher algorithm is proposed to study the periodic and oscillatory problems. Simulation results obtained using RK-Butcher algorithms and the classical fourth order Runge-Kutta (RK(4)) methods are compared with the exact solutions of a few periodic and oscillatory problems to confirm the performance of the proposed algorithm. The simulation results from RK-Butcher algorithms are always found to be very close to the exact solutions of these problems. Further, it is found that the RK-Butcher algorithm is superior when compared to RK(4) methods in terms of accuracy. The RK-Butcher algorithm can be easily implemented in a programming language and a more accurate solution may be obtained for any length of time. RK-Butcher algorithm is applicable as a good numerical algorithm for studying the problems of orbit and two body as it gives the nearly identical solutions.

• Archives of design research
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• v.14
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• pp.297-318
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• 1996

In a specialized modern society and/or visual communication technique seems to be preferable to the traditional one-way communication technique which resorts to reading materials. P.R materials currently produced by various levels of Korean government administrative bodies seem to outdated and inefficient both in their contents and in graphic technique employed. In this paper we argue that the problems of the communication technique used by Korean government result mainly from the ambiguous nature of the message of P.R materials and the inability to differentiate the contents of P.R materials according to the target audience. We recommend various changes to the current government communication program and emphasize the importance of graphic communication technique for the production of more effective and professional communication materials

• International Journal of Contents
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• v.10 no.2
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• pp.9-17
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• 2014

Since vehicles' trajectories are so complex and dense traffic changes in nature frequently, the VANET (Vehicles Ad-hoc Network), using Omni-directional Antenna, has many channel collisions (or overlapping) on Data Link phrases (MAC layers). It is not easy to keep a good seamless communication status for VANET because of its unpredictable network environment. Among VANET research, Directional Antenna have been proposed as one of the most common systematical solutions to reduce (or to mitigate) this miss-communication problems by narrowing communicational ranges and making use of its customized error-detection process. However, even though Directional Antennas help VANET keep good seamless communication, many VANET researchers have reported that Directional VANET still has miss-communicational problems - this has lead to problems like 'Directional Hidden Terminal Problem', 'Deafness', 'Un-accuracy Lobe Scopes' and 'High Deployment Cost' being reported in various papers. To establish well-organized design assessments for a good Directional VANET MAC protocol to overcome these problems, we rearranged and grouped current Directional VANET' qualitative criteria from several current survey papers using these categories- 'Directional Discovery', 'Directional Forwarding' and 'Directional Handover'. In addition, based on the results of the following analysis, we show the essential design concerns that need to be looked at in order to develop a well-designed Directional-VANET MAC protocol.

• Korean Journal of Child Studies
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• v.32 no.4
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• pp.99-113
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• 2011

This study examined natural groupings of mother-adolescents in terms of the sub-factors of problems in family communication. The natural groupings were as follows; the placating type, the blaming type, the super-reasonable type, and the inattention type. In addition, this paper also examined individual differences in trait anger and anger coping strategies patterns by clusters of sub-factors of problem in family communication. The subjects of this study consisted of 406 adolescents. Data were analyzed by means of cluster analysis and one-way ANOVA. The results from cluster analysis with the adolescent sample suggested the presence of four clusters ('placating-suppression', 'mixing up-confusion', 'authoritarian-hostility', 'consistent-repression'). Additionally, these four groups were found to be related to trait anger and anger coping strategies (anger-suppress, anger-out, anger-control).

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2017.11a
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• pp.254-255
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• 2017

As the number of ships and goods shipped by marine transportation increases, almost all shipping companies adopted foreign crews in order to overcome lack of seafarers and be competitive for manning cost. Thus, these days it is inevitable to work with foreign crews aboard ships, but there occur many marine accidents due to language barriers and communication problems under multicultural and multilingual shipboard environments. In order to resolve troubles resulting from different languages, reduce miscommunication risks, and make working on ships safe and efficient, this study recognized the current status of ships with mixed crews, analyzed marine accidents caused by communication problems not only in Korea but also in other countries using analytical methodologies. Additionally, existing hazards affecting miscommunication were identified and risk of miscommunication was quantitatively evaluated while offering suggestions and future forecasts. Consequently, in this study we suggested that fundamental dialogues are to be necessarily educated on the ships with foreign crews so as to reduce the language barrier and risk of miscommunication. Furthermore, a standard maritime Korean language program and manual targeting Korean coastal vessels would be developed in the next step.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.11
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• pp.2043-2047
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• 2010

This study is to solve problems of depletion of RF bandwidth frequency, confusion possibility, security that current wireless communications system have and is to confirm possibility of applying next generation network. To solve problems of current wireless communications system, visible light communications system for power line communications using ATmega16 Microcontroller is was realized and receiver property was analyzed. PLC exclusive chip APLC-485MA, Microcontroller ATmega16, 5pi bulb type LED and high flux LED, visible light receiving sensor LLS08-A1 were used for transmitter and receiver. Performance was analyzed by designed program and an oscilloscope. It was showed average 20% improved receiver rate rather than bulb type LED in the case of high flux LED through voltage change rate on communication distance and LED type of distance between 10 to 50 cm. The blue LED showed the best performance among measured LED types with above 10% of voltage decreasing rate. But As it gradually becomes more distant, the precise date was difficult to obtain due to weak light. To overcome these sort of problems, specific values such as changing conditions and efficiency value relevant to light emitting parts and visible light receiving sensor should be calculated and continuous study and improvements should also be accomplished for the better communications condition.