• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.19 no.5
• /
• pp.1189-1198
• /
• 2015

Recently, with rapid development of digital broadcasting technology, high-definition video service increased interest and demand. supplied mobile and image device support that improve 4~16 time existing Full HD. Such as high-definition contents supply, proposed compression for high-efficiency video codec (HEVC). Therefore, watermarking technology is necessary applying HEVC for protecting ownership and intellectual property. In this paper, analysis of prediction mode in intra frame and study feasibility of watermarking in re-encoding based HEVC. Proposed detect un-changed blocks in intra frame, using the result of analysis prediction mode.

• Journal of Advanced Navigation Technology
• /
• v.4 no.1
• /
• pp.23-35
• /
• 2000

In this paper, the design for a PCS base station antenna which is using broadband method by a stacked structure has been studied. The sensitive parameters, such as the parasitic elements, the height of air layer between the upper and lower patch, and the variation of feed point, of the microstrip antenna that has stacked structure in a characteristics variation situation are classified and the characteristics has been investigated through the simulations. A designed antenna has following characters. Impedance bandwidth is Z57.5MHz(VSWR${\leq}$2), horizontal beamwidth is $64.1^{\circ}$, and gain is 14.7dBi. Therefore, it is confirmed the characteristics is good. In this paper, through the designing of a stacked microstrip antenna, we has investigated the availability for Korea PCS base station antenna.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.31 no.12B
• /
• pp.1058-1067
• /
• 2006

In this paper, we propose a inband/outband broadcast method for hidden incumbent system detection of medium access control layer for wireless regional area network systems using cognitive radio technology. Through some extra channels that are not currently used, a short message is broadcasted. The message allows CPE detecting an appearance of incumbent system to send sensing report to CR BS. For the hidden incumbent system report message, the BS needs a process or method for allocation of upstream resource to CPEs. And transmitting multiple out-band signals has a possibility to collide with out-band signals of other co-located WRAN BSs. To avoid out-band signal collision, BSs randomly select it out-band signal broadcasting time within the pre-defined explicit out-band signaling, period. And fractional Bandwidth Usage allows WRAN BSs to efficiently use bandwidth.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2011.05a
• /
• pp.497-498
• /
• 2011

In 21 century, we use a variety of new wireless technologies focuses on broadcasting and Communications. Because of widely spread wireless-service, demand a lot of frequency. It requires various wireless access technologies. Especially UWB, SER, Millimeter Wave etc. Among them, UWB can use wide Frequency band, because it is different from Non-traditional approach which Frequency Band Using the exclusive rights granted by. Furthermore, it does not cause interference to other existing frequency, therefore this technology is attracting attention. In this paper, describe study on a UWB technology, design about useable antenna for UWB communication.

• Korean journal of communication and information
• /
• v.26
• /
• pp.105-134
• /
• 2004

This longitudinal study examines changing factors readers of online newspaper on 1999 and 2004. In terms of Users and Gratification approach, this survey explore changing what is motives of online newspaper readers, using and satisfying of online news during five years. The factor analysis of Online newspaper's reading motive statements yielded three interpretable factors: 'informativeness-convenience', 'inter-activity', 'entertainment'. First, 'informativeness-convenience' on 2004 was lower than '99 in online newspaper reading motives and satisfying, but factor of 'interactivity' and 'entertainment' measured thar 2004 was higher than '99 in chat of online newspaper. A level of reading online newspaper on 2004 is lower than '99, 'people' and 'opinion' is highest reading online newspaper item. Bur that of '99 is 'top news' and 'political news'. 'Top news', 'economics' and 'infor-mation/science' is highest satisfying level of online news item on '99, but that of order changed into 'people'. 'opinion' and 'broadcasting/enter-tainments' on 2004. In conclusion, this study shows online newspaper readers perceived interactive service and entertainment factor.

• Journal of Ocean Engineering and Technology
• /
• v.23 no.5
• /
• pp.25-31
• /
• 2009

The most important component of wind turbine is rotor blades. The developing method of wind turbine was focused on design of rotor blade. By the way, the design of a rotating body is more decisive process in order to adjust the performance of wind turbine. For instance, the design allows the designer to specify the wind characteristics derived by topographical map. The iterative solver is then used to adjust one of the selected inputs so that the desired rotating performance which is directly related to power generating capacity and efficiency is achieved. Furthermore, in order to save the money for manufacturing the rotor blades and to decrease the maintenance fee of wind power generation plant, while decelerating the cut-in speed of rotor. Therefore, the design and manufacturing of rotating body is understood as a substantial technology of wind power generation plant development. The aiming of this study is building-up the profitable approach to designing of rotating body as a system for the wind power generation plant. The process was conducted in two steps. Firstly, general designing and it’s serial testing of rotating body for voltage measurement. Secondly, the serial test results above were examined with the CFD code. Then, the analysis is made on the basis of amount of electricity generated by rotor-blades and of cut-in speed of generator.

• 전자공학회논문지 IE
• /
• v.47 no.4
• /
• pp.59-67
• /
• 2010

The purpose of the present study is to examine prediction of academic self-efficacy, perceived usefulness and ease of use on flow and academic achievement in community college education. For this study, D Community college in Korea was chosen and two survey were conducted. The subject were 114 engineering students who enrolled in the spring semester of 2010. The result of this study through multiple regression analysis indicated that academic self-efficacy predicted significantly on flow. But perceived usefulness and ease of use didn't predicted significantly on flow. Also, academic self-efficacy, perceived usefulness predicted significantly on academic achievement. But ease of use didn't predicted significantly on academic achievement. The result of this study suggested that academic self-efficacy, perceived usefulness should be considered for improving flow and academic achievement in community college education.

• Journal of Broadcast Engineering
• /
• v.17 no.5
• /
• pp.817-826
• /
• 2012

This paper presents a robust viewpoint estimation algorithm for Moving Parallax Barrier mobile 3D display in sudden illumination changes. We analyze the previous viewpoint estimation algorithm that consists of the Viola-Jones face detector and the feature tracking by the Optical-Flow. The sudden changes in illumination decreases the performance of the Optical-flow feature tracker. In order to solve the problem, we define a novel performance measure for the Optical-Flow tracker. The overall performance can be increased by the selective adoption of the Viola-Jones detector and the Optical-flow tracker depending on the performance measure. Various experimental results show the effectiveness of the proposed method.

• Journal of Broadcast Engineering
• /
• v.16 no.2
• /
• pp.360-371
• /
• 2011

T-DMB hybrid data service provides advanced data services while maintaining backward compatibility with legacy T-DMB receivers by using hybrid BIFS technology enabling distributed delivery of scene description information and object description information. This paper presents the hybrid service authoring framework implementing hybrid BIFS technology for creating contents for distributed delivery, and the results of experiments by using it. Hybrid service authoring framework is comprised of service creation system, service management system, and contents offering system. It enables the creation of combined hybrid data service and the splitting of the contents into two parts for ecah delivery network, data for broadcasting network and the data for mobile network. It also enables the managements of the contents. The feasibility of advanced data services while maintaining backward compatibility with the legacy T-DMB receiver has been proved by the contents created by using the hybrid authoring framework presented in this paper.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.22 no.6
• /
• pp.829-834
• /
• 2018

As the IT technology is progressing, the big data becomes more important and is exploited on the various industry. The R is the language and the environment analyzing the big data. The university which is the highest level of the academic organization keeps opening and maintaining the departments anticipating the needs of the progressing trends. As analyzing the names of the departments opened at the universities, it is possible to find out the requirements and the needs of the recent trends. In this paper, we analyze the names of the departments presented at the 4 year universities using the R. To do this, we collect the names of the departments and measure the frequency of the names in order to know the department of major frequently presented at the universities.