• Korean Journal of Pharmacognosy
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• v.31 no.3
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• pp.288-294
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• 2000

The Korean crude drug 'Suk Wi' has been used as the folk remedy for diuretic and gonorrhea. The botanical origin of the crude drug has never been studied pharmacognostically. To clarify the botanical origin of Suk Wi, studied on the morphological and anatomical characteristics of Pyrrosia species growing wild in Korea i.e., P. linearifolia, P. lingua, P. petiolosa, P. tricuspis and Suk Wi from Korea on Korean market. As a result, it was made clear that Suk Wi from Korea was derived from Pyrrosia lingua and P. petiolosa.

• Information and Communications Magazine
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• v.23 no.4
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• pp.23-34
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• 2006

WiBro 서비스는 휴대형 단말기를 통해 실외에서도 정지 및 이동중에도 고속도로 인터넷에서 접속하여 필요한 정보나 멀티미디어 컨텐츠를 이용할 수 있게 하는 통신 서비스이다. WiBro 유무선통합커뮤니케이션 서비스는 WiBro 뿐만 아니라 유선 초고속 인터넷, 무선랜 등 통합 환경에서 메신저, 영상대화, MMS, e-메일 등 다양한 커뮤니케이션 서비스를 제공하는 서비스로 언제 어디서나 사용자가 상대방과 연결될 수 있는 유비쿼터스 커뮤니케이션을 제공한다. 다양한 단말, 장비기기들 및 사업자간의 상호 운용이 가능하도록 IMS(IP Multimedia Subsystem) 아키텍처를 기반으로 SIP 표준 프로토콜을 사용하여 구축되었으며 IP 커뮤니케이션을 중심으로 다양한 응용서비스 연동 및 제공이 가능하다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.5B
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• pp.334-343
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• 2008

In this work we propose a universal pricing machine, which incorporates a universal pricing framework for the future IEEE802.16 WiMAX service with multiple classes of service. A multimedia service is provided by a QoS provisioning scheme in the WiMAX network and universal pricing means that it can compute the price for any type of service in a unified framework. In the proposed pricing framework we incorporate multiple types of services such as the real time and nonreal time services that are supposed to be provided in the WiMAX network. To that purpose, let us first carry out an analysis on the current pricing scheme of Korean WiMAX service which incorporates only the data size. From that analysis we propose a new pricing scheme for the future WiMAX service that provides different service classes in the network. Via numerical experiment, we verify the implication of the work.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.47-48
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• 2012

스마트폰 보급과 Wi-Fi 기술의 대중화로 다양한 서비스가 가능해졌지만 현재까지도 Wi-Fi 이용을 위해서는 많은 소요시간과 사용자의 개입이 필요하다. 본 논문에서는 Wi-Fi 이용에 필요한 과정과 각 과정의 소요시간을 측정/분석하고, NFC기술을 이용하여 사용자의 불필요한 개입 없이도 신속하게 Wi-Fi 접속을 가능하게 하는 기법을 제안한다.

• Korean System Dynamics Review
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• v.12 no.2
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• pp.37-67
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• 2011

This study first attempted to point out fundamental reasons behind the failure to have WiBro services off the saddle, investigating the previous studies, and second to screen the WiBro promotion policies after reviewing the major steps conducted thus far by the government. In order to put the screened policies in order by the importance, an AHP analysis was conducted targeting WiBro professionals in various fields such as government offices, universities, research institutes, and industry. One step further, causal loop diagramming on the system dynamics methodology was conducted to examine the dynamic structure of the WiBro market in holistic standpoint of view. Finally, a simulation model was developed based on the causal loop diagrams and the results of the AHP analysis in order to examine how various policy scenarios influence the growth of the WiBro market over time, and to compare the mix of policy options. Finally, the study attempted to draw some implications for WiBro vitalization.

• Journal of Digital Convergence
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• v.10 no.4
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• pp.257-263
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• 2012

Smart phones become popular all over the world recently. At the same time, demand of various additional services, such as SNS by utilizing low-cost reliable Wi-Fi network and position information, is expected to keep growing. In this paper, Implementation of SNS based on an Open Wi-Fi & Position Information was proposed. This service is achieved by constructing an Open Wi-Fi network based on a built AP access information database. And in order to provide durable connection in mobile environment, RSS detect AP switching module and mobile IP are utilized in the proposed service. Furthermore, with the utilization of GPS information of AP, AP providers could delivery various information such as advertisements, promotion events. In addition, it is possible for AP users to communicate with each other, thus a position information based SNS was also proposed in this paper.

• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.256-259
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• 2007

Multicast and Broadcast Service (MBS) provides flexible and efficient transmission of the same information to multiple users using shared radio resources on WiBro network. The advantage of this service is to achieve the most efficient use of radio and network resources as well as to lessen sender's processing load when sending the same information to multiple users. Though radio resources are saved since a multicast or broadcast transport connection is associated with a service flow, it is hard to change MBS service channel dynamically. In this paper, we propose a Radio Resource Management System (RRMS) for supporting dynamic scheduling of MBS service channels. Results show that our proposed scheme using Radio Resource Allocation Table (RRAT) can efficiently support MBS services by providing dynamic schedule for MBS service channels.

• Disaster Prevention Review
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• v.14 no.4
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• pp.122-123
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• 2012

• The Korean Publising Journal, Monthly
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• s.317
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• pp.23-24
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• 2002

• Journal of the Korean Mathematical Society
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• v.22 no.2
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• pp.199-210
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• 1985