• Electronics and Telecommunications Trends
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• v.22 no.2 s.104
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• pp.79-91
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• 2007

현대는 정보통신의 발전으로 산업은 물론이고, 정치.사회.문화의 모든 측면에서 변화가 빨라 미래를 내다보고 대비하지 않으면 살아남을 수 없는 상황이고, 정보통신의비전을 미래 사회 예측을 통해 도출하는 것은 의미가 크다. 또한 유무선 통신.방송 통합 인프라 환경은 전 세계가 네트워크로 연결되는 정보통신의 본질적 특성과 맞물려 영역간 새로운 접합점을 만들어 내고, 다양한 서비스와 기기 간의 원활한 소통을 위한 표준의 중요성을 증대시키고 있다. 특히 1994년 WTO 체제의 출범을 계기로 글로벌경쟁시대가 본격 개막됨에 따라 국가 간 FTA 협정 체결로 국가 간 무관세화 등 경제의 블록화가 급진전되고 있고, 국제표준은 세계시장 선점을 위한 전략적 도구로 부상하고있다. 따라서 21세기 지식정보사회에서 우리나라가 정보화를 조기에 실현하여 지식정보강국으로 도약하고, 세계 정보통신 시장에서 주도적인 위치를 확보하기 위해서는 미래사회 및 사용자의 요구를 기반으로 정보통신시장을 주도할 미래 핵심 기술에 대한국제 표준화를 추진할 수 있는 정보통신 표준화 전략의 수립 및 체계적인 추진이 필요하다. 본 논문에서는 미래 정보통신 동향 및 표준화 환경과 국내외 미래 연구 동향을 분석함으로써 향후 바람직한 표준화 추진 전략을 모색하여 국내 기술의 국제 표준화에 도움을 주려고 한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.2
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• pp.493-500
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• 2010

XML Web Service is a new distributed computing paradigm for combining all computer systems through the on-line standardized open network, so it is expected that companies can get the results of increasing profits and reducing costs through this. Especially XML Web Service is essential in mobile environment. In this paper, a new XML Web Service is proposed and it is based on WIPI-based XML standard technology and mobile web service standard. The proposed XML Web Service embodied XML Parser which can be used in WIPI environment and made HTTP communication. In addition, as an example of the practical application, it was applied to an inventory Management, Book Store using JAVA language for WIPI.

• Proceedings of the KAIS Fall Conference
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• 2004.11a
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• pp.218-221
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• 2004

차세대 인터넷은 'Internet is Life'를 그 모토로 하고 있으며 인터넷의 Cyber Space를 실생활과 연결시켜 일상생활 속에서 인터넷이 구현되는 생활속의 인터넷 구현을 그 목표로 하고 있다. 차세대 인터넷은 사용자에게 언제, 어디서나 고품질 멀티미디어 서비스를 유무선 관계없이 안전하게 초고속으로 제공하는 방향으로 발전될 것으로 전망되고 있는데 이 과정에서 대용량의 데이터를 안정적으로 전송할 수 있는 백본망 기술이 절실히 요구되고 있다. 인터넷 백본망 구현 기술로 1990년대 후반에는 IPoA나 IPoS 기술이 주로 사용되었으나 2000년대에 들어서는 IPoW 기술이 많이 사용되고 있는 추세이며 2002년 이후로는 DWDM 방식이 IP를 전송하는 백본망 기술로 많이 활용되고 있다. 향후 이러한 백본망기술의 발전은 메트로망, 가입자 망 기술과 통합되어 초고속 네트워크 구축의 핵심 기능을 제공할 것으로 예상된다. 본 논문에서는 이러한 백본망 기술의 현황 및 앞으로의 발전 방향에 대해 살펴보고자하며 이를 통하여 차세대 인터넷의 로드맵을 개략적으로 그려보고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.6B
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• pp.573-587
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• 2003

Due to the growth of mobile communication and the popularization of Internet, it is expected that wired and wireless communication network of the next generation will be integrated and flourished with IP-based. There have been a great deal of research efforts to provide mobile IP service onthe existing lower layer. The location update and the paging scheme is one of the most challenging technical issues for this topic. In this thesis, a paging method based on the distance-based location update scheme is proposed for IP network to support mobility in layer 3. The proposed scheme is implemented and verified with the OPNET.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.205-206
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• 2015

스마트폰이 유선전화의 단말기가 되면 스마트폰의 전화번호부를 유선통화에도 사용할 수 있게 되어 유선전화의 사용량이 늘어나고, 이를 통해 사용자는 통신요금이 낮아지는 혜택을 누리며 유선 사업자는 수익 증대를 기대할 수 있다. 그러나 이동통신용 단말기로 제작된 스마트폰을 유선전화의 단말기로 이용하는 데는 i) 사용자 편의성 증대를 위한 스마트폰 등록 절차의 간소화, ii) 저전력 상태와 WiFi 비활성화 상태에서 전화수신 안정화, iii) 무선데이터 전송시간 변이에 의한 음성품질 저하 회피 등 다양한 기술적 문제들이 존재한다. 본 논문에서는 이와 같은 문제들에 대한 해결 방안을 제시하고 이를 반영한 실험용 시스템의 구현 결과를 보여준다. 실험용 시스템은 사설교환기 기능을 내장한 WiFi-AP, 안정적인 전화수신 알림을 위한 PUSH broker, VoIP 어플리케이션이 설치된 스마트폰으로 구성된다. 실험용 시스템은 PSTN 망과 VoIP 망에 연동하여 스마트폰으로 안정적인 통화품질을 제공할 수 있음을 보였다.

• Journal of the Korea Society of Computer and Information
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• v.17 no.2
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• pp.95-103
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• 2012

In this paper, we propose an efficient mobile P2P streaming architecture to minimize playback jitters in P2P overlay networks based on wired/wireless networks even though mobile peers experience the handover. In this architecture, mobile peers receive data in a push manner to maximize the data receiving speed before and after the handover. In addition, they can maintain the buffering above a specific level through handover prediction and re-selection of neighbor peers. By simulation experiments, we show that our proposed architecture can improve the performance significantly when the handover occurs compared to the existing mesh structure.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.400-402
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• 2019

The electric point machine, which is used for the control of the turnout used to change the track of the train, is very important in the railway system. Various wired and wireless real-time monitoring systems are used to check the status of the point machine, but there is a possibility of malfunction due to sensor or network error. In this paper, a redundant monitoring system was designed that incorporates the point machine monitoring system and the CCTV camera control system to double check the operation of the point machine. In the point machine monitoring system, the operating state of the railway converter is monitored, alarmed and transmitted over the network. The CCTV camera control system, which received this information, was required to record the status of the turnout and the point machine in question and send it to the administrator. The manager of the railway line can check the conversion status of the railway through the monitoring screen for the railway line switcher first, and then confirm the switching status directly through the CCTV camera image, thereby improving the reliability of the point machine operation. It will also enable the safe and efficient operation of personnel for management. It is expected to contribute to preventing a derailment caused by a malfunction of the point machine.

• Journal of KIISE:Computer Systems and Theory
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• v.33 no.6
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• pp.326-336
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• 2006

Due to the evolution of wired and wireless communication technologies and the Internet, multimedia services such as Internet broadcast and VOD have been prevalent recently. RTP is designed to be suitable for transmission of real-time multimedia data on the Internet by IETF While a variety of applications have utilized different RTPs implemented as a library, embeddedRTP is RTP-based kernel-level protocol that resolved performance issues of this kind of RTPs. This paper proposes the ExtendedERTP protocol based on existing embeddedRTP. This new protocol resolves a couple of issues such as packet processing overhead and buffer requirement and combines its APIs with BSD socket APIs which have been widely utilized in network applications. This paper demonstrates that this integration makes it possible to transmit real-time multimedia data through the accustomed interface of BSD socket APIs with nominal extra overhead. This paper also proposes a scheme for improving packet processing time by 15$\sim$20% and another scheme for reducing memory requirement for packet processing to about 3.5%, comparing with those of embeddedRTP.

• Journal of The Korean Society of Integrative Medicine
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• v.1 no.1
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• pp.61-68
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• 2013

Purpose : The purpose of this study is to evaluate the stability and balance of the body, mobility complex exercise group and a student group for FMS tests to compare the differences between the two groups to identify its purpose. Method : The subjects of this study FMS measuring D University Physical Therapy, a student enrolled patients (7:7), and 7 patients total of 14 patients was conducted, compound exercise group weekly stretching 10 minutes, the 24 members who have run a complex exercise, 10 minutes of cool down stretching, 20-minute aerobic exercise were included in the study. Result : The results of this study, according to 1) Deep squat, Inline lunge, Trunk Stability Push-up there was significant difference(p<0.05), compound exercise group came out significantly higher. 2) Hurdle Step, Shoulder Mobility Reaching, Active Straight-leg Raise, Rotary stability in measured target these women flexibility because the test items that did not show a significant difference(p>0.05), the two groups averaged compared to the other items were higher. Complex exercise group, a statistically significant difference was overall average. Conclusion : FMS can not be resolved because of a compensatory mechanism to identify disparities and unbalanced movement patterns can help. Therefore, if the FMS and other tests conducted by splicing, will be utilized more profitably, and you will be able to suggest ways that can have a positive impact injury prevention is added to the side to expand the scope of the physical therapist.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.695-698
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• 2007

The control of electrical appliances residing in the home network can be accomplished via Internet with the UPnP expansion without modifying an existing UPnP. In this paper, we propose the Internet Gateway that consists of an UPnP IGD(Internet Gateway Device) DCP(Device Control Protocol) and an UPnP Bridge as a system to control electrical appliances of home network. UPnP IGD DCP is to enable the configurable initiation and sharing of Internet connections as well as assuring advanced connection-management features and management of host configuration service. It also supports transparent Internet access by non-UPnP-certified devices. UPnP Bridge searches for local home network devices by sending control messages, while control point of UPnP Bridge looks up devices of interest on the Internet, subsequently furnishing the inter-networking controlling among devices which belong to different home network systems. With our approach, devices on one home network can control home electrical appliances on the other hone network via Internet through IGD DCP with control commands of UPnP.