• The Journal of the Korea institute of electronic communication sciences
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• v.4 no.1
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• pp.25-32
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• 2009

The advancements in the infusion of broadcasting and communication and the radio frequency identification technology have made the next generation mobile communication service technology be recognized as an important technology in many different fields and demanded systems of practical service using the technology. Designed in the study was a multimedia platform that would increase the utilization efficiency of limited frequency resources, which made an important part of the next generation mobile communication technology using the radio frequency identification technology, search for vacant frequencies not generating interfering signals to the old frequency users, and consider the growth of infused and complex services. In order to implement the platform, the investigator applied STI as a research model to maximize the functions of a service system and improve reliability. And also suggested IDMA of information required for platform building to maximize the functions of a service system.

• Journal of Convergence for Information Technology
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• v.8 no.5
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• pp.153-158
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• 2018

In this paper, we have studied a dimming level control method to satisfy both lighting and communication performance in visible light communication system. In the case of the most commonly used OOK and RZ-OOK modulation schemes, continuous Burst Zero Duration will seriously degrade the lighting function. This causes not only the illumination but also the performance of the entire system to deteriorate. Through this study, we analyzed the dimming level characteristics of the existing system and proposed the Illegal Pulse Insertion (IPI) algorithm as a technique to increase the dimming level. Through this, it is possible to effectively control the dimming level and improve the QoS of both lighting and communication by resolving the flicker phenomenon and dimming level reduction in the existing modulation and demodulation system.

• 한국정보통신설비학회:학술대회논문집
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• 2003.08a
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• pp.303-306
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• 2003

최근 정보통신시장이 성숙기에 도달함에 따라, 기존 통신을 기반으로 한 타 분야와의 통합 또는 융합에 대한 관심이 매우 높다. 그 중 유무선 통합은 종래에는 분리된 영역이라고 여겨왔던 유선과 무선 영역이 서로 부분적으로 또는 단계적으로 연결, 공유 또는 통합되는 현상이다. 본 논문에서는 유무선 통합 서비스에 대한 개념과 국내외의 유무선 통합 서비스 현황을 살펴보고 향후 발전방향을 논한다.

• Information and Communications Magazine
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• v.28 no.12
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• pp.9-15
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• 2011

스마트폰의 폭발적인 확산으로 무선인터넷서비스 사용 환경이 보다 편리해지고, 소비자의 니즈는 환경변화에 따라 복합적으로 진화하게 되었다. 이러한 다변화된 니즈에 부합하기 위하여 기존의 통신사업자와 3rd Party에서 다양한 신규 모바일 서비스가 등장, 발전하고 있다. 이러한 소비자 니즈의 변화 및 신규 서비스의 등장으로 통신사업자는 기존 통신망에서 새로운 망으로의 진화를 추진하고 있다. 현재 등장한 다양한 기술 및 서비스가 향후 모바일 환경에서는 여러 가지 서비스가 융합되어 진화될 것으로 예상된다. 이에 모바일 환경에서의 서비스의 현황 및 과제를 제시하고 향후 진화방향을 전망해보고자 한다.

• The Journal of the Convergence on Culture Technology
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• v.3 no.2
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• pp.55-59
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• 2017

We are confirmed to the transfer degree of physical signal with the communication code on the wireless communication system. The physical transfer system was consisted of such as ECG, PPG and Bluetooth part that received signal. Communication method was take the international standard level of IEEE802.15.1 forms, the frequency transition was needed the bandwidth of communication for transfer signal with the band-communication method. The program was expressed to receive with wireless communication condition that was consisted of such as the serial chart, processing and app inventor. Their signal was identified to transfer certainly the corrected signal. Therefore, signal processing for coding by the real-time graphing and using processing by a standard capacity of serial-chart graphing that will be possible to progress the improvement effectiveness of wireless communication system.

• Journal of the Korea Convergence Society
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• v.10 no.11
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• pp.9-14
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• 2019

In modern society drones are actively utilized in the fields of security, defense, agriculture, communication and so on. Smart technology and artificial intelligence software have been developed with convergence, and the field of use is expected to expand further. On the point of the excellent performance of drones one of the essential technologies is the wireless communication that make the ground facility receive the video streaming obtained by the drones in the air. In the research the concept of communication region is proposed to cover the both the low altitude region for Wi-Fi communication and the high altitude region for LTE communication for the sake of video transmission. Also the hybrid communication structure is designed along the proposed concept and the proposed system is implemented as a communication system in the small size which can be mounted in a small size of drone. It is confirmed that the proposed system contains the effectiveness by showing the ability to successfully transmit HD video streaming in the range of 500 meters and the transfer time between two different communication systems is measured in 200msec by the experiments.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.332-333
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• 2022

Recently, SpaceX, private enterprise dealing in space development company, has reported a plan for launching of 42,000 low earth orbit satellites until 2031 through Starlink Business, and launched 900 satellites until now. Concretely, it plans tp operate Ku/Ka band satellite, and launch 7,518 of V band satellites for broadband communication. Therefore, we can utilize wireless communication in an ocean, and various solutions through the low earth orbit satellites. This paper deals in a realization of wireless control system employing FPGA (Field Programmable Gate Array) for vessel applications.

• Information and Communications Magazine
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• v.29 no.8
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• pp.42-49
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• 2012

본고에서는 B4G (Beyond 4G) 시스템의 기술 동향과 B4G 시스템을 위한 다양한 주파수 활용 기술에 대해 알아본다. B4G 시스템은 4G 통신 시스템 뿐만 아니라 기존 3G 이동통신망 또는 무선랜 시스템 등이 융합되어 다양한 서비스를 제공할 수 있을 것으로 기대된다. 또한 셀룰러망 기반의 새로운 M2M (Machine - to - Machine) 프로토콜의 등장으로 단말 간 직접통신 기술이 새로운 화두로 자리 잡고 있다. 이러한 B4G 시스템을 위해서는 효율적인 무선자원 활용이 가능한 주파수 활용 기술이 필수적인 핵심 요소이다. 따라서 본고에서는 향후 도래할 B4G 시스템의 요소 기술들을 소개하고, 이를 위한 핵심적인 주파수 활용 기술에 대해 알아보고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.3B
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• pp.398-407
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• 2010

Due to increase of user requirement for various traffics and the advance of network technology, each distinct network has converge into FMC(Fixed Mobile Convergence) networks. However, we need to research the performance analysis of VoIP(Voice over Internet Protocol) in the FMC network to provide QoE for the voice user of FMC network. Therefore, this paper introduces the scenario which is the situation of voice quality degradation when a user uses VoIP to communicate with other users in the FMC network. Especially, this paper presents scenario in terms of the component of the network and finds the improvement point of voice quality. In the simulation results, three improvement points of voice quality are found as following: voice quality degradation by packet loss in the physical layer of the HSDPA network, by utilizing GGSN without QoS parameter mapping mechanism which is gateway between 3GPP and IP backbone, and by using non-QoS AP in the WLAN network.

• Annual Conference of KIPS
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• 2011.11a
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• pp.834-837
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• 2011

AMI 시스템은 정보통신 기술과 전력망의 융합으로 탄생한 새로운 형태의 차세대 전력망인 스마트그리드의 핵심기술 중 하나이다. AMI 시스템의 부하 제어 및 수요 측정, 미터링, 과금 등을 위한 다양한 유 무선 통신기술(ZigBee, PLC, Binary CDMA 등)을 적용함에 있어 기존에 제시된 AMI 네트워크 보안 위협에 따른 취약점은 스마트그리드 전체 네트워크의 보안사고를 유발할 수 있다. 본 논문은 AMI 시스템 상에서 ZigBee, Binary CDMA와 같은 무선 네트워크의 적용으로 인한 보안특성을 분석하고 보안 요구사항에 대한 대응방안을 제시한다.