• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.759-762
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• 2012

This paper is for EPC(Evolved Packet Core) network to share the load balance by IMSI(International Mobile Subscriber Identity) prefix in MME(Mobility Management Entity). For the telecommunication, it needs to choose the anchoring gateway to use the specific gateway to avoid the traffic load to support the efficient telecommunication service. We propose the way to choose the effective gateway to avoid the traffic load in order for good qualify service. We compare the load between the gateways which are the general gateway and the specific gateway used by proposed concept.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.2
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• pp.191-204
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• 2003

In the home gateway environment, several characteristics for the user authentication mechanism should be reflected separately from the existing distributed service environment. First, the platform of a home gateway is a component based system that its services are installed dynamically. Second, the convenience that user can use several services by authentication of once should be offered. Finally, the system resources of a home gateway are restricted. However, a user authentication mechanism that reflected these characteristics is not shown at the user admin service specification of the OSGi service platform.(OSGi is the representative standardization organization of hone gateway.) Also, there is no existing authentication protocol that satisfies these qualities at the same time. In this paper, we propose a new user authentication mechanism considering those characteristics for the home gateway environment. We also design and implement an independent authentication service bundle based on the OSGi service platform so that it can perform user authentication operations for each bundle service. We supplement and extend the Kerberos Protocol that can apply.

• Journal of Internet Computing and Services
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• v.15 no.1
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• pp.135-142
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• 2014

In this paper, we present integrated SNS Gateway as way to reduce mobile SNS traffic. Integrated SNS gateway's role is communication broker that located between mobile clients and SNS server. In Integrated SNS gateway, web service adapter communicates with SNS Server. Experiment was performed in aspects of contents RTT and network traffic. We evaluate and propose performances of integrated SNS gateway using gateway.

• Journal of the Korean Society for Library and Information Science
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• v.55 no.1
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• pp.439-467
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• 2021

While the body of cases on startup has grown substantially, there has been a lack of a one-stop gateway of entrepreneurship. The study attempts to build a subject gateway for startup information services based on case studies, users' needs analysis, and literature reviews. The results show that users have difficulty in selecting useful information since the excess of information and the search for the desired information as it is scattered across a wide range of sources. The study designed a subject gateway by a navigation system that enables flexible browsing within the entire gateway through the ontology modeling. The study also presented an example of startup records to display how startup information can be explored. This study is expected to contribute to the understanding of the current status related to business startup services. The business startup digital gateways based on empirical data analysis will contribute to extending library service for startup.

• Journal of the Korea Society of Computer and Information
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• v.10 no.6 s.38
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• pp.355-364
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• 2005

Ubiquitous environment can be supported by various service on networked appliance, sensors and devices. In home network and telematics, open service gateway is widely used for ubiquitous environment and Present environment for service installation, deployment and execution. Service gateway is a middle layer which is located between service and various devices in ubiquitous environment and offers a unique opportunity for pervasive computing as a potential framework for achieving interoperability between various sensors, home appliances. and networked devices. In ubiquitous environments, these services must support the mobility among service gateway because users and devices has a mobility characteristic. However the OSGi framework supports only a remote installation of a bundle, which is a unit that installs and deploys services. This paper develops a system that can manage bundles for supporting this dynamic bundle's mobility between service gateway. This system we are proposing implements a bundle form which can perform in an OSGi framework as well as manage the mobile services. As a result, mobility in a ubiquitous computing environment will be supported more efficiently.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10b
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• pp.586-588
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• 2004

가정 내의 가전기기들이 디지털화되고 있고, 이것들을 네트워크로 연결하여 원격지에서 제어하는 스마트 홈 관련 기술들이 현실화되고 있다. 이러한 환경에서의 컴퓨팅을 위해서는 응용 프로그램간의 호환성 뿐 아니라 데이터의 호환성, 그리고 이종의 프로토콜간의 연동이 필수적이다 따라서 이를 위한 소프트웨어가 바로 스마트 홈 미들웨어이다. OSGi(Open Service Gateway Initiative)(8)는 장비 연결 및 제어로 얻을 수 있는 유효한 서비스나 여러 미들웨어들 간의 통합을 위한 제반 환경 제공을 목표로 하는 비 표준화 단체로써 OSGi 프레임워크 환경에서 서비스들은 서비스 게이트웨이와 서비스 번들의 life-cycle을 따라 동적으로 전개된다. 본 저자들은 SMF(Service Management framework)(9)를 사용하여 OSGi를 기반으로 한 Smart Home Service Bundle에 관해서 연구하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.226-228
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• 2002

이동통신망이 발달하면서 기존의 인프라를 생성하였던 ATM망을 음성서비스에 활용하기 위한 Voice over ATM기술이 많은 발전을 하고 있다. 본 논문에서는 ATM 망에서 Low-bit-rate voice 트래픽을 처리하기 위해 1020개의 커넥션을 지원하는 AAL2 Voice gateway를 구현하였다. 본 논문에서 구현된 AAL2 Voice gateway는 ITU-T Recommendations 1.363.2와 1.366.2에 근거하여 설계하였다. 또한, SSCS(Service Specific Convergence Sublayer)와 CPS(Common Part Sublayer) 부계층을 모두 하드웨어로 구현하였다. 본 AAL2 Voice gateway는 VHDL로 구현되었으며, 이동통신망과 VoDSL의 Voice gateway에서 그 효용 가치가 높을 것으로 사료된다.

• Journal of KIISE:Computer Systems and Theory
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• v.31 no.1_2
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• pp.27-40
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• 2004

The OSGi service platform has several characteristics as in the followings. First, the service is deployed in the form of self-installable component called service bundle. Second, the service is dynamic according to its life-cycle and has interactions with other services. Third, the system resources of a home gateway are restricted. Due to these characteristics of a home gateway, there are a lot of rooms for malicious services can be Installed, and further, the nature of service can be changed. It is possible for those service bundles to influence badly on service gateways and users. However, there is no service bundle authentication mechanism considering those characteristics for the home gateway In this paper, we propose a service bundle authentication mechanism considering those characteristics for the home gateway environment. We design the mechanism for sharing a key which transports a service bundle safely in bootstrapping step that recognize and initialize equipments. And we propose the service bundle authentication mechanism based on MAC that use a shared secret created in bootstrapping step. Also we verify the safety of key sharing mechanism and service bundle authentication mechanism using a BAN Logic. This service bundle authentication mechanism Is more efficient than PKI-based service bundle authentication mechanism or RSH protocol in the service platform which has restricted resources such as storage spaces and operations.

• IEMEK Journal of Embedded Systems and Applications
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• v.2 no.1
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• pp.17-23
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• 2007

The home network has been revitalized due to the emergence of the high-speed broadband network and explosive increases of the home network services. Especially multicast based high-definition (HD) IPTV service is on high demand from both Internet service provider (ISP) and users. In order to provide high quality HD IPTV service without packet loss and delay, the ISP utilizes various network QoS mechanisms. Due to the misleading fact, that the home gateway is considered as an end terminal in terms of the ISP's viewpoint, the ISPs can not guarantee the end-to-end QoS within the scope of the current home network architecture. Therefore, an independent QoS guaranteed mechanism should be considered within the home network domain. As the home gateway manages both private home and public access network within the home network, we propose and implement a novel QoS mechanism for the multicast based HD IPTV service over the home gateway. In order to provide QoS guaranteed HD IPTV service, the proposed mechanism classifies the packets, manages home network bandwidth resources, and executes call admission control using the channel join message. Also, we utilize layer 2 multicast packet forwarding scheme to improve the overall performance of the home network services. Through the experiments of implementing the multicast based HD IPTV services, we will verify the efficiency of the proposed mechanism.

• IEIE Transactions on Smart Processing and Computing
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• v.3 no.5
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• pp.325-330
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• 2014

The era of convergence is being applied to all areas of Information and Communication Technology (ICT). The convergence of broadcasting service and communication service almost occurs on smart devices including smartphone. The smart hybrid Digital Multimedia Broadcasting (DMB) is a typical example of the convergence of broadcasting and wireless communication service. The hybrid mobile broadcasting service can support seamless video, 3D, high quality, and additional data services based on network connection between the broadcasting and wireless network. The gateway and terminal (including apps on the smartphone) take the role of the main components on the hybrid service. This paper presents the service concept, main components structure, the implementation of gateway and terminals, and field test to the urban areas for the mobile hybrid system.