• Smart Media Journal
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• v.6 no.3
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• pp.83-88
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• 2017

The data analysis system using Big-data is worthy to be used in various fields such as politics, traffic, natural disaster, shopping, customer management, medical care, and weather information. Particularly, the analysis of the momentum of an individual using an acceleration signal collected from a wearable device has already been widely used. However, since the data used in such a system stores only the data necessary for measuring the individual activity, it does not provide various analysis results other than the exercise amount of the individual. In this paper, I propose a system that analyzes collective behavior pattern and activity based on the acceleration signal that can be collected from personal smartphones for 24 hours a day and stored in big data. I also propose a system that sends acceleration signals and receives analysis results using standard messaging to use on various smart devices.

• Journal of Digital Convergence
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• v.10 no.6
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• pp.259-267
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• 2012

Internet telephony is an Internet service which supports voice telephone using VoIP technology on the IP-based Internet. It has some advantages in that voice telephone services can be accompanied with multimedia services such as video communication and messaging services. Recently, the introduction of smart phones has led to a growth in social networking services and thus, the research and development of Internet telephony has been actively progressed and has the potential to become a replacement for the telephone service that is currently being used. In this paper we designed and implemented an Internet telephony network system which is developed by using Asterisk and open source softwares. It is developed on the linux system and has some features such as VoIP telephony service between SIP phones, voice mail, and call recording. It also supports web-based functions such as SIP users and server system management that is implemented by Apache web server and PHP programs. Afterwards, this system will be applied as VoIP network base technology for small sized companies and organizations. It will paly a role for encouraging companies to use open source softwares.

• Journal of Digital Convergence
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• v.9 no.5
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• pp.225-233
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• 2011

Internet telephony is an Internet service which supports voice telephone using VoIP technology on the IP-based Internet. It has some advantages in that voice telephone services can be accompanied with multimedia services such as video communication and messaging services. Recently, the introduction of smart phones has led to a growth in social networking services and thus, the research and development of Internet telephony has been actively progressed and has the potential to become a replacement for the telephone service that is currently being used. In this paper we designed and implemented a recording system which records voice data of SIP-based Internet telephone's voice calls. It is developed on the linux system and has some features such as audio mixing of two in/out voice channels, live packet sniffing, and the ability to transfer mixed audio files to the log file server. These functions are implemented using various open source softwares. Afterwards, this VoIP recording system will be applied as a base technology to advanced services like a VoIP-based call center system.

• Journal of the Korea Society for Simulation
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• v.16 no.4
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• pp.33-41
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• 2007

Service-Oriented Architecture(SOA) define the interaction method between two computing entities that one entity performs a unit task instead of another entity. This, unit task, is called "Service" and interaction of these services should have independency and loosely coupled task. The effect of SOA's main functions such as loosely coupled task and independent interoperability with influence the possibility of flexible message communication between different way and different users. In this article, we analyzed the performance about system stabilization between general web service and SOA based application that implemented through WCF based messaging framework using .NET Framework and integrated data presentation method. As the result of test, we confirmed that SOA environment using WCF have more advantages.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.9
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• pp.1065-1070
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• 2015

The era of IoT in which all objects are intelligent and are connected to the Internet has been started. In order to establish and activate an IoT eco system, open services platform is very important. In this paper, we developed a gateway that utilize the Raspberry Pi which is open source hardware for IoT open service platform. The gateway supports a variety of wireless interface and equipped with MQTT, a standard messaging protocol for IoT. To confirm main function of developed gateway, we built a IoT test bed and verified normal operation of our gateway.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.12
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• pp.2321-2328
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• 2006

Today, SIP standard (The signalling protocol for the Internet phone service) raises to be the standard technique because the expandability is high and complexity is low. It is widely investigated and actively advocated to use Si81a1 ring protocol for SIP in VoIP service. SIP service can be applied even outside the Internet phone service; instance messaging and various multimedia technology are just an example. This paper proposed an embodiment proxy server for rambling support to use JAIN SIP API. It provides standard interface for testing the Proxy server for SIP and embodiment of user agent that transfer instant massaging and voice communication.

• Proceedings of the Korea Contents Association Conference
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• 2004.11a
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• pp.240-243
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• 2004

Recently, in the global and digital business environment, we are in need of a single window through which we can exchange market information, make a contract, exchange foreign currency, clear customs and settle accounts. The "e-Trade platform" provides all the stakeholders in international trading circles with these series of trading processes by use of any available information technologies in an effective and seamless manner. The platform collectively includes e-trade infrastructures(e-trade documents repository, e-trade messaging system, e-trade standard documents repository) enabling small and medium sized companies as well as large enterprises to interface with government organizations and global trading institutions. The IT levels of the trading companies are significantly important in terms of benefiting the quality services from the e-trade platform.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.5
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• pp.1163-1172
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• 2015

In this paper, an MQTT based protocol is designed and implemented for control, management and monitoring of HVAC in a cloud platform in real time. The MQTT protocol is a two-way messaging protocol, and has the generality, flexibility, light weighted, quickness with reliability and security. In the implemented system, performance and reliability of the communication protocol is considered for data acquisition and control between the CCU and the cloud server. Control and monitoring for the cloud server is performed in real time in conjunction with CCU and the MQTT server.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.799-802
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• 2011

최근 RFID (Radio Frequency Identification) 기술은 다양한 분야에서 관심을 받고 사용되고 있으며 RFID와 모바일을 접목시켜 현대사회의 의사소통을 해결 하는데 많이 적용되고 있다. 학교에서는 학생과 교수간의 원활한 소통을 위하여 주기적인 상담이나 인터넷 상담과 같은 다양한 방법들을 사용하고 있다. 그러나 교수와 학생이 각자의 바쁜 일정에서 빈 시간을 내어 매번 약속을 해서 만난다는 것은 번거로운 일일 수 있다. 그러므로 교수와 학생간 좀 더 쉽게 소통 할 수 있도록 도와주는 시스템이 필요하다. 이를 위해 RFID와 안드로이드 기반 스마트폰을 이용하여 교수/학생 파워 메시징 시스템을 구축하였으며, 본 논문에서는 그 내용에 대해 기술한다. 이 시스템에서 학생은 RFID 태그가 부착된 학생증을 교수 방 앞에 설치된 RFID 리더기에 인식시키고, 그 순간 교수가 남긴 메시지를 확인할 수 있다. 또한 교수와의 상담시간을 예약 할 수 있으며, 본인의 메시지도 남길 수 있다. 교수는 자신의 일정을 관리 할 수 있고, 스마트폰을 통해 학생이 다녀간 방문 기록, 예약 정보, 학생이 남긴 메시지를 실시간 확인 할 수 있다. 이 시스템을 구축함으로써 교수와 학생의 소통 기회는 증가할 것이고, 또한 교수는 원격으로 학생과 지속적인 의사소통 기회를 가짐으로써 보다 효율적으로 학생을 관리할 수 있게 된다.

• The Transactions of the Korea Information Processing Society
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• v.6 no.8
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• pp.2133-2144
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• 1999

IMT-2000 system is expected to start its service at the beginning of 2000 on the purpose of providing with the highest qualitative service through one mobile terminal. In this paper, we investigate some of the important issues which need to be addresses in designing an authentication protocol for IMT-2000. Also proposed is an authentication protocol which addresses the above issues, and we design a correct and efficient authentication protocol to establish secure communication channel. Our protocol provides an authentication of the communication entities, location privacy, and secure messaging as well as global roaming service.