• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.3
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• pp.919-940
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• 2012

Video on Demand (VOD) is a multimedia service which allows a remote user to select and then view video at his convenience at any time he wants, which makes the VOD become an important technology for many applications. Numerous periodic VOD broadcasting protocols have been proposed to support a large number of receivers. Broadcasting is an efficient transmission scheme to provide on-demand service for very popular movies. This paper proposes a new broadcasting scheme called Popularity Cushion Staggered Broadcasting (PCSB). The proposed scheme improves the Periodic Broadcasting (PB) protocols in the latest mobile VOD system, which is called MobiVoD system. It also, reduces the maximum waiting time of the mobile node, by partitioning the $1^{st}$ segment of the whole video and storing it in the Local Media Forwarder (LMF) exactly in the Pool of RAM (PoR), and then transmitting them when the mobile nodes miss the $1^{st}$ broadcasted segment. The results show that the PCSB is more efficient and better than the all types of broadcasting and caching techniques in the MobiVoD system. Furthermore, these results exhibits that system performance is stable under high dynamics of the system and the viewer's waiting time are less than the previous system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.3
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• pp.1061-1072
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• 2013

In order to improve executive ability in response to need of job ability in cultural content industry and in connection with industrial scene, it is required to develop curriculum for department of broadcasting, entertainment and acting First of all, environmental analysis of cultural content industry, survey on industry demand, survey on demand by enrolled students and graduated students, survey on demand by local community were made and conducted to draw job competency for acting art. In addition, the existing curriculum was analyzed through evaluation by field experts, enrolled students, and graduated students. Based on the analysis results, major curriculum was developed for department of broadcasting, entertainment and acting. Such curriculum development enables providing acting education that focuses on core competency to maximize education effect and cultivating actor who is suitable for the age of multimedia based on local infrastructure. Moreover, the curriculum development helps cultivating versatile actor, rather than famous actor.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.2
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• pp.151-156
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• 2015

As the proliferation of smart phone, almost every user has one's own smart phone, and the user could get the global position and location based services using GPS system outdoors. But indoor positioning system using GPS does not work, and it could not detect global position using TDOA local positioning system. In this paper, a new indoor global positioning system for smart phone employing GPS receiver and electronic compass device is proposed with the TDOA local positioning system using acoustic signal, and the performance and the experimental result are described.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.6
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• pp.319-324
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• 2011

This study aims to investigate statistical variations and relationships of blood pressure (BP), phtotplethysmography (PPG) and cardiovascular parameters on changes in local skin surface temperature (SST) during gradual cooling and heating. Results showed that local SST changes affected the Finometer BP, the PPG waveforms and total peripheral resistance, but not oscillometric BP, heart rate, stroke volume and cardiac output. Therefore, in order to reduce for the errors, temperatures should be controlled or compensated when components of the PPG waveform are used to evaluate cardiovascular status in temperature variation environments.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.07a
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• pp.49-50
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• 2015

본 논문에서는 2009년도에 설치 운영중인 중앙재난상황실의 DMB(Digital Multimedia Broadcasting) 재난경보방송시스템을 이용하여 국지적 재난방송으로 활용하기 위한 연구로 광역단위의 재난방송이 아닌 지자체 중심의 국지적 재난방송이 가능하도록 활용방안에 대해서 연구하였다. 게릴라성 폭우등 지구 환경의 변화로 인하여 국지적 재난이 빈번히 발생하고 있는 상황에서 국지적 재난 상황을 일반 국민에게 신속히 상황 전파하고 대피 방법등 지역 맞춤형 재난방송을 전달함으로 재난에 대한 국민의 신뢰도를 높힐 수 있는 방안을 연구하였다.

• Journal of the Korean Data and Information Science Society
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• v.21 no.5
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• pp.983-997
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• 2010

This study is to explore the relationship between trust in local administrative organization and organizational performance. Local administrative organizations provide the citizens with administrative services. Heightening the organizational performance contributes the citizens' happiness and the stream of times through organizations' change. To provide high quality of administrative service to citizens, trust in organizations is more important than any other capital. The improvement of organizational performance needs through this social capital. Factors about trust variables and organizational performance variables are extracted through the theoretical discussions. To do the research, public servants in 7 local administrative organizations of Gangwondo were asked to do the survey about how trust in organizations affects organizationa performances. The results explain that trust variables are related to organizational performance, and the local administrative organization which is high in trust is high in organizational performance. Trust in local administrative organizations improves the organizational performance internally and the organization will obtain trust from the citizens externally.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.891-894
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• 2004

This paper proposes an improved image segmentation algorithm by the watershed algorithm based on the local adaptive threshold on local minima search and the fixing threshold on label allocation. The previous watershed algorithm generates the problem of over-segmentation. The over-segmentation makes the boundary in the inaccuracy region by occurring around the object. In order to solve those problems we quantize the input color image by the vector quantization, remove noise and find the gradient image. We sorted local minima applying the local adaptive threshold on local minima search of the input color image. The simulation results show that the proposed algorithm controls over-segmentation and makes the fine boundary around segmented region applying the fixing threshold based on sorted local minima on label allocation.

• ETRI Journal
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• v.30 no.2
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• pp.341-343
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• 2008

This letter presents an angular minimum spanning tree (AMST) algorithm for topology control in multi-hop wireless ad hoc networks. The AMST algorithm builds up an MST for every angular sector of a given degree around each node to determine optimal transmission power for connecting to its neighbors. We demonstrate that AMST preserves both local and network-wide connectivity. It also improves robustness to link failure and mitigates transmission power waste.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.1346-1349
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• 2002

This paper presents the design and implementation of 16-QAM modem that can be applied to fixed broadband wireless access systenm. It is implemented in the hardware prototype that consist of FPGA(Field Programmable Gate Array) for digital signal processing and analog front end module for analog signal processing. We provide 20.48Mbps data rate using implemented modem and test the modem in KOREA 26㎓ broadband wireless local loop system including IFU(Intermediate Frequency Unit) and RFU(Radio Frequency Unit) via air interface.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.6
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• pp.21-28
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• 2008

In this paper, we proposed an algorithm that reduces call setup time between the IP PBXs installed in the main office and several branch offices. In the IP PBXs installed in branch offices, we prepare some internal memory spaces, and they keep the frequently used extension numbers and the corresponding IP PBX's addresses. In order to call an extension number registered to the other remote IP PBX from an extension number registered to the local IP PBX, the local PBX searches for the destined extension from its internal memory first. If the extension is found, then the local PBX uses its corresponding IP PBX address stored along with the extension, instead of making a query to the main office's IP PBX. By this technique, we could shorten the average call setup time and verified it by an experiment.