• Journal of the Institute of Electronics Engineers of Korea TC
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• v.48 no.7
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• pp.35-40
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• 2011

In u-TSN environment, the communication between vehicle terminal and roadside equipment is very important to support prompt service and to secure road traffic information in real-time upon organizing traffic system. This study suggested V2I or I2V communication service scenario for performance test on vehicle communication system as well as V2V inter-vehicle communication service scenario for emergency information transmission which requires rapidity and accuracy. After implementing real inter-vehicle communication system, we performed vehicle communication experiment following suggested communication service scenario to test the performance. Consequently, we could draw out the optimal transmission mode setup condition, and the result can be applied to the development of stable and efficient u-TSN vehicle communication system.

• Journal of the Korean Society for information Management
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• v.22 no.1 s.55
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• pp.5-20
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• 2005

This study aims at the fundamental factors needed to make the policy for internet reference service of public records were presented, considering the methods for improvement of internet reference service of national assembly records. For this purpose, reference service theory of recorded informations and examples of foreign congress reference services were analyzed. From the result of analysis, three tasks were proposed as an improvement plan for internet reference services of national assembly records: establishment of access policy, improvement of reference service programs, and activation of communication with users.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.01a
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• pp.67-70
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• 2015

특정 인터넷 서비스는 그 성격에 따라 제한된 위치에서만 서비스를 제공하도록 설계한다. 이러한 시스템 구조에서 사용자의 위치정보는 서비스 접근을 통제하는 과정에서 핵심적으로 사용되며 LSB(Location Based Service), WPS(Wifi Positioning System)와 같은 기술로 제안되었다. 그러나 기존 인증 기법은 대상이 일정하지 않은 불특정 다수의 사용자가 접근하기에 적합하지 않고, 서비스 공급자의 무선 AP를 이용하기 때문에 과도한 서버 부하에 취약하다. 따라서 본 논문에서는 이러한 문제를 해결하기 위해서 Beacon을 이용한 위치기반 인증 시스템을 제안한다. Beacon이란 Bluetooth 기술을 기반으로 근거리 무선 통신 기기이다. 사용자가 서비스 접근 권한을 획득하기 위해 인증 서버에서 요구하는 인증 코드는 BLE(Bluetooth Low Energy)를 사용하는 Beacon이 브로드캐스팅한다. 즉, 사용자는 Beacon이 BLE로 브로드캐스팅한 데이터를 수신할 수 있는 물리적인 범위까지 접근해야 인증 절차를 수행할 수 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.4
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• pp.61-72
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• 2018

The purpose of this study is to analyze the impact of quality and satisfaction of mobile telecommunication service on the quality data sharing for mobile telecommunication service. Based on the theory of reasoned action(TRA), we proposed a research model that (1) service qualities significantly influence the service satisfaction and the attitude towards information sharing, (2) the attitude towards information sharing mediates between service satisfaction and the intention of information sharing, and (3) the intention of information sharing is affected by the service satisfaction and the attitude towards information sharing. Empirical analysis of mobile service users showed that the data quality of mobile communication services had a greater impact on satisfaction than voice quality. The service satisfaction had a positive effect on attitude towards information sharing and the intention of information sharing. Also, the attitude towards information sharing had a positive impact on the intention of information sharing. Based on this empirical study, we proposed a crowdsourcing as an alternative when quality data of mobile telecommunication service should be collected to improve telecommunication policy because by using collective intelligence of the crowdsourcing the government can gather more accurate and diverse data on mobile telecommunication service.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.2 s.332
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• pp.1-8
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• 2005

We have implemented a Jini-Agent system which enables resource-limited mobile devices to utilize the Jini connection service. The Jini-Agent system supports Jini connection technologies to mobile devices without additional client program installation in it. It also supports a dynamic service list which helps the mobile devices to search and to utilize the services through web browser in real time. A couple of examples such as a file search service and a print service with mobile devices have been demonstrated by using the Jini-Agent system.

• International Journal of Internet, Broadcasting and Communication
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• v.14 no.4
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• pp.104-120
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• 2022

In severe disaster situations, Emergency alert provide information for people to survive. However, the only device that can receive the Cell Broadcasting Service (CBS) of the Korean Public Alert System (KPAS), the Public Warning System (PWS), is Smart Phone and Receiving the disaster information is very limited. Therefore, this paper proposes a solution to the problem. First, we discover problems through the analysis of KPAS, and second, we propose Smart Watch and Navigation as devices to receive Emergency alert. The devices can receive disaster information through Bluetooth communication from Smart Phone and provide content such as disaster-related images and videos. Based on the proposed items, the application was developed, and as a result of the test, Smart Phone provided more disaster information like images and videos than current emergency alert, and the method of notification of emergency alert was varied. And Smart Watch and Navigation received disaster information successfully through Smart Phone, which also provided various disaster information like images and videos. The developed application has expanded functionally than the existing emergency alert and can benefit many people in emergency situations.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.1105-1108
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• 2005

Media service model is divided into 3 models that are Client Pull, Server Push, and IPP(Interleaving Pull & Push) model. In most single VOD(Video On Demand) environment, Client Pull model was sufficient to play the movie Because most media contents has a low bitrate and resolution. But according to an increment of the demand of the high definition media, Client Pull model is not sufficient. Parallel VOD environment is made of several of VOD servers and provides the parallel media stream simultaneously for one client. We compared and analyzed the performance of service models with respect to network delay and data size in buffer in the single and parallel VOD environment and we found that IPP service model keeps the least network delay and stable client buffer state in the parallel VOD environment.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.4 no.5
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• pp.709-735
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• 2010

The reciprocal virtue of peer-to-peer networking has stimulated an explosion of peer population and service capacity, ensuring rapid content distribution in peer-to-peer networks. Critical issues such as peer churn, free riding, and skewed workload significantly affect performance results such as service agility, fairness, and resource utilization. To resolve these problems systematically, this study proposes a peer assignment scheme that supports fair peer-to-peer file sharing applications. The proposed scheme exploits the peer duality of both server-oriented peer capacity and client-oriented peer contribution. Accordingly, the system server can prioritize download requests and appropriately assign server peers to uploading file objects. Several functional extensions, including peer substitution and elimination, bandwidth adjustment, and distributed modification, help cope with subtle situations of service starvation and download blocking, and hence make the system design robust and amenable. Simulation results show this design is examined under both centralized and distributed peer-to-peer environments. Performance results confirm that the proposed mechanisms are simple but effective in maintaining service agility and fairness, without loss of overall service capacity in peer-to-peer files sharing systems.

• 한국디지털정책학회:학술대회논문집
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• 2004.11a
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• pp.203-210
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• 2004

In this paper, the conceptualization and the measurement of service quality and the relationships among service quality, consumer satisfaction, value, and post behavior (post behavior and recommendations to others) are investigated. The results suggest that service quality is an antecedent of consumer satisfaction and that consumer satisfaction exerts a strong influence on payment value and post behavior.

• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.99-103
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• 2008

Recently, the mRFID which combines RFID system a mobile uses infra of mobile communication and it provides object information service with the form which is various. Currently, many object information service system exists. But such system object information is by a service box and becomes the inclusion in specific territory and connection it does from different territory, there is a difficult problem point. It secured the weak point of object information service system of existing from the dissertation which it sees and the object information service system which is suitable in application development of the mRFID it embodied.