• Proceedings of the IEEK Conference
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• 2002.07a
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• pp.552-555
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• 2002

Wideband CDMA is one of the radio access technologies for the third generation in which voice is the basic service. There has been lot of research work in order to find out the suitable transmission scheme to meet the requirement of accommodating variable type of services in Wideband-CDMA. This paper studies the behavior of different services using different transmission schemes in Wideband CDU and compares their performance in terms of BER. Different transmission schemes are found to be suitable for different services. Transmission schemes used are- fixed processing gain scheme also called as variable bandwidth scheme, single code transmission and multicode transmission. It is found that fixed processing gain scheme is suitable fur high data rates. Single code transmission is suitable fer low data rates where as multicode transmission is suitable for low and medium data rates.

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.1103-1106
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• 1999

Telegram is an indispensible information & telecommunication system to our daily life. VTS(Voice Telegram System) under intensive research is intended to enhance exchanging capability of information & telecommunication by adding voice media to existing telegram system. Overall configuration and necessary core technologies of the system were investigated for its development. Among those many technologies in need, the technology of compressing and recording data is most critical to the development of cheap hardware. This is so called vocoder algorithm and is the core technology of voice information system. So, here, vocoder algorithm now being studied will be introduced.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.9 no.5
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• pp.1825-1839
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• 2015

The final draft of the latest video coding standard, High Efficiency Video Coding (HEVC), was approved in January 2013. The coding efficiency of HEVC surpasses its predecessor, H.264/MPEG-4 Advanced Video Coding (AVC), by using only half of the bitrate to encode the same sequence with similar quality. However, the complexity of HEVC is sharply increased compared to H.264/AVC. In this paper, a method is proposed to decrease the complexity of intra coding in HEVC. Early pruning and an early splitting strategy are applied to the quadtree structure of coding tree units (CTU) and residual quadtree (RQT). According to our experiment, when our method is applied to sequences from Class A to Class E, the coding time is decreased by 44% at the cost of a 1.08% Bjontegaard delta rate (BD-rate) increase on average.

• Journal of Korea Technology Innovation Society
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• v.5 no.1
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• pp.26-43
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• 2002

Korean government has been putting efforts to promote development of technologies by government sponsored labs and to transfer, diffuse, and commercialize these technologies in private sector since mid 1980s. In spite of these efforts, utilization of government-sponsored technology remains in the very low level. According to the survey conducted by Korea Intellectual and Patent Office (1999), the ratio of unused industrial property rights including patents was above 70% of total industrial property rights. Survey on the information and telecommunication industry done by the Institute of Information Technology Assessment (IITA) in 1999 shows that the utilization ratio of government-sponsored technologies is about 55.8%. This is especially true where government is not the primary or end-user of technologies. The purposes of this paper are to (1) identify a process model of technology commercialization, (2) develop the related variables of each step in the six-step continuous process model of government-sponsored technology commercialization, (3) empirically investigate the data gathered through questionnaire survey, and (4) suggest policy alternatives for promoting technology commercialization in Information and Telecommunication industries.

• Proceedings of the IEEK Conference
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• 2002.07a
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• pp.14-17
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• 2002

A configuration for radio-over-fiber transmission, with remote LO delivery from the central office, and a simple, cost-effective, base station solution is proposed. It is shown that using practically available components, and even with a fiber dispersion of 17 ㎰/nm/km, it is possible to transmit, without repeaters, bit rates of up to 622 Mbit/s for about 20 km at a bit-error rate of 10$\^$-9/, with 0㏈m laser power and a modest optical gain of 6㏈. By increasing the optical gain to 25 ㏈, the link length can be increased to ∼80 km.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.602-605
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• 2006

Recently, under recognition that ubiquitous computing is core paradigm to build up a state of new knowledge information and to strengthen the competitiveness of domestic information industry, governments, enterprises, and institutes in United States, Europe, and Japan devote all their energies to develop technologies concerned. In Korea, the government presents ubiquitous technologies as a main part of the next generation growth industry, and also other governmental agencies and enterprises concentrate their energies on early fruition of ubiquitous society. Accordingly, as a foundation research to apply ubiquitous environment which emerged as a next generation high-end telecommunication technology effectively to construction field, this paper will discuss about element technologies to realize changing aspects of construction process under ubiquitous environment and information services by stages.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.426-429
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• 2001

The customer cabling telecommunication facilities assume an important role in the telecommunication networks. The present technologies for domestic customer cabling facilities are established with the multimedia environment reflected, but are insufficient for accommodation of multimedia services of the ultra high-speed information and communication networks. In the present paper, the status of international and domestic standardization are reviewed and the operational environment of customer premise telecommunication facilities are investigated and analyzed in order to enhance customer cabling facilities in Korea. The problems with the operational environment are analyzed, and how to improve customer cabling telecommunication facilities is suggested based on the above.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.1684-1688
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• 2005

In this paper, authentication technologies for X-ray inspection images in container merchandises are introduced and a method of authentication for X-ray inspection images is proposed. Until now, X-ray images of container merchandises have been managed without any authentication of inspection results and environments, it means that there was no any action for protection of illegal copy and counterfeiting of X-ray images from inspection results. Here, authentication identifies that who did inspect container X-ray images and, whether the container X-ray images were counterfeited or not. Our proposed algorithm indicates to put important information about X-ray inspection results on an X-ray image without affecting quality of the original image. Therefore, this paper will be useful in determining an appropriate technology and system specification for authentication of X-ray inspection images. As a result of experiment, we find that the information can be embedded to X-ray image without large degradation of image quality. Our proposed algorithm has high detection ratio by Quality 20 of JPEG attack.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.9 no.3
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• pp.92-101
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• 2010

Energy efficiency and safe mobility are the two key constituents of the future automobile. The technologies that enable these features are now heavily dependent upon information and communication technology rather than traditional auto-mechanical technology. This paper presents an exploratory project 'Smart&Green Vehicle Project' at Western Michigan University which is to improve the geographical location accuracy of vehicles and to study various applications of making such location data available. Global Positioning System (GPS), Inertial Navigation System (INS), Vehicular Ad-hoc Network (VANET) technology, and data fusion among these technologies are investigated. Testing and evaluation is done on systems which will gather vehicular positioning data during GPS signal loss. Vehicles in urban settings do not acquire accurate positioning data from GPS alone; therefore there is a need for exploration into technology that can assist GPS in urban settings. The goal of this project is to improve the accuracy of positioning data during a loss of GPS signal. Controlled experiments are performed to gather data which aided in assessing the feasibility of these technologies for use in vehicular platforms.

• Journal of Korea Spatial Information System Society
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• v.8 no.3
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• pp.65-75
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• 2006

Recently, the technologies related with location-based services have been a promising and vigorously researched area in mobile telecommunication industry. LBS have obtained increasingly high attention particularly in domestic area, due to increases in various LBS services supplied by mobile telecommunication companies. LBS technologies are classified by sub-technology such as location determination technology, LBS platform technology, and LBS application services technology. In this paper, I have examined the trend of LBS technologies by analyzing the issued or published patents from 1991 to 2005. The analyzed results are very useful for avoiding overlapping efforts in developing the LBS related technologies, and searching the direction of development of technologies which are different from previous ones.