Korea Communications Agency

Naju, South Korea

Korea Communications Agency

Naju, South Korea
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Choi J.,Dankook University | Jung B.,Dankook University | Choi Y.,Dankook University | Son S.,Korea Communications Agency
Mobile Information Systems | Year: 2017

Employing multicore in mobile computing such as smartphone and IoT (Internet of Things) device is a double-edged sword. It provides ample computing capabilities required in recent intelligent mobile services including voice recognition, image processing, big data analysis, and deep learning. However, it requires a great deal of power consumption, which causes creating a thermal hot spot and putting pressure on the energy resource in a mobile device. In this paper, we propose a novel framework that integrates two well-known low-power techniques, DPM (Dynamic Power Management) and DVFS (Dynamic Voltage and Frequency Scaling) for energy efficiency in multicore mobile systems. The key feature of the proposed framework is adaptability. By monitoring the online resource usage such as CPU utilization and power consumption, the framework can orchestrate diverse DPM and DVFS policies according to workload characteristics. Real implementation based experiments using three mobile devices have shown that it can reduce the power consumption ranging from 22% to 79%, while affecting negligibly the performance of workloads. © 2017 Jongmoo Choi et al.

Kim B.C.,ETRI | Kim W.-K.,Korea Communications Agency | Lee G.-T.,Korea Communications Agency | Choi H.-D.,ETRI | And 2 more authors.
Bioelectromagnetics | Year: 2014

This paper presents the results of measurements from simultaneous human exposure to various radiofrequency (RF) signals at densely populated areas. Measurements were performed at 1260 positions across Korea to determine exposure compliance to electromagnetic fields for the general public. The measured exposure levels were very low compared with the international exposure guidelines and Korean human protection notice. The highest total exposure ratio was 5.1×10-3 (approximately 7.1% of guideline limits). © 2014 Wiley Periodicals, Inc.

Lee S.,Korea Communications Agency | Kim K.,Korea Communications Agency | Jang W.,Korea Communications Agency | Le A.N.,Hanoi University
International Conference on Ubiquitous and Future Networks, ICUFN | Year: 2013

Recently, M2M (Machine-to-Machine) is a emerging technology to enhance the telecommunication market for the future. So, many global Standardization bodies (including ITU-T, ETSI, oneM2M) are actively promoting to work for making the global standards. And some of them have been worked architecture, use case and requirements for M2M service from a few years ago. However, they have some obstacles since M 2M h as a l ot o f stakeholders and is relate to a variety of industry fields such as smart home, telematics, healthcare, smart grid etc. Hence, starting to 2013, oneM2M begins in earnest to work for fundamental technical specification and ToR (Terms of Reference). Therefore, this paper proposes a service-adaptive functional architecture for M2M service from a global standardization (oneM2M) perspective. A service-adaptive functional architecture is composed of device domain, network domain and service domain to easily provide the related standards. © 2013 IEEE.

Bayarmagnai E.,i2max | Lee S.-H.,Korea Communications Agency | Kim D.-H.,Jeju National University
Lecture Notes in Electrical Engineering | Year: 2012

Electric vehicles are fueled by a battery charger that transfers electricity provided by electric utilities into the vehicle battery to recharge it. This paper proposes architecture for remote monitoring of electric vehicle based on M2M(Machine to Machine) in mobile platform. This architecture is composed of mobile terminal and electric vehicles. Mobile terminal includes monitoring module, buffer, communication module, etc. And electric vehicle includes monitoring agent, logical object, memory, etc. This architecture provides a variety of the real-time sensing data such as velocity, acceleration, temperature and energy in vehicles. We design the remote monitoring system in mobile platform and electric vehicles. © 2012 Springer Science+Business Media.

Lee S.-Y.,Yonsei University | Lee S.-Y.,Korea Communications Agency | Lee S.-W.,Yonsei University
Computers in Human Behavior | Year: 2015

As people increasingly access movies, user-created content, and linear television programs through the Internet, scholars are paying attention to the effect of online video services on various media markets, including the broadcasting market. Focusing on South Korea, this study examines how changes in the time spent on online video services affect the time spent on other media: terrestrial TV, pay TV, terrestrial DMB, radio, SNSs, games, newspapers, and books. This study also examines how this time displacement effect of online videos on other media differs across various video content categories. The results show that an increase in the time spent on online video services reduces the time spent on cable TV and games. Among the online video content categories, broadcast network programs and cable network programs reduced the time spent on cable TV, and movies reduced the time spent on games. Moreover, the amount of time spent viewing online videos reduced the time spent on non-media activities but increased sleeping time. © 2015 Published by Elsevier Ltd.

Moon Y.,Jeju National University | Kim D.,Korea Communications Agency | Jang W.,Korea Communications Agency | Lee S.,Korea Communications Agency
Communications in Computer and Information Science | Year: 2012

Recently, products are appeared with functional components for smart home by supporting the efficient information providing service and a variety of remote controlling electric products through smart information devices such as smart phone. Thus, this paper proposes the architecture and service scenario for remote control and information provision service of home appliance using M2M(Machine-to-Machine)-based remote control function. Also, this paper implements Open API(Application Program Interface) to support the remote control home appliance service using WCF(Windows Communication Foundation) technology of .NET. © 2012 Springer-Verlag.

Yoon H.,Korea Communications Agency | Hwang J.,University of Management and Economics | Weiss M.B.H.,University of Pittsburgh
Computer Networks | Year: 2012

Because of increasing spectrum demand, the value of the spectrum resource has been increasing, and efficiency of spectrum usage has been an important issue in the wireless industry. Therefore, there have recently been many studies of changing the spectrum management framework based on market mechanisms. This research analyses three different mechanisms as alternative secondary trading frameworks: a brokerage mechanism, auction and direct trading, and suggests an optimal framework for secondary-use trading based on in-depth simulations that consider different attributes according to their technical characteristics and market changes. Based on the analysis, this study investigates economic values and competition environments of each alternative for secondary trading mechanisms. © 2011 Elsevier B.V. All rights reserved.

Youn M.,Yonsei University | Kim S.G.,Korea University | Jeon H.E.,Korea Communications Agency | Lee J.,Yonsei University
IEICE Transactions on Communications | Year: 2012

Topology control is one of the key issues in wireless networks. In this letter, we propose a simple topology control algorithm based on Connected Dominant Set (CDS) theory. The proposed algorithm uses less memory and less overhead cost than other existing schemes, and is therefore appropriate for implementation in wireless sensor networks. We will prove that the algorithm can form a CDS and guarantee network connectivity. The performance of our algorithm is demonstrated by simulation results. Copyright © 2012 The Institute of Electronics, Information and Communication Engineers.

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