• Proceedings of the Korea Information Processing Society Conference
• /
• 2007.11a
• /
• pp.1262-1265
• /
• 2007

인터넷 및 디바이스의 발달과 유비쿼터스 환경이 도래함에 따라 모바일 디바이스를 이용하여 서비스를 제공받고자 하는 수요는 급속도로 증가하고 있다. 유비쿼터스 환경에서 모바일 디바이스가 이기종 네트워크로 이동하여 언제, 어디서, 누구에게나 끊김없는 서비스를 제공하기 위해서는 이기종 네트워크간의 통신 및 디바이스간의 데이터 통신이 가능해야 한다. 그러나 동종 네트워크에서의 보안 기술 및 통신 기술로는 이기종 네트워크에 적용했을 때 확장성 및 안전성에 많은 문제가 따른다. 따라서 이기종 네트워크 로밍 환경에서 안전하고 효율적인 인증 메커니즘을 제안하였다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2007.11a
• /
• pp.391-394
• /
• 2007

상위(HOST)시스템은 TCP/IP 환경이 적용 되어야 하며, 하위(P/C)시스템은 BSC프로토콜을 그대로 사용가능 해야 한다. G/W시스템은 이 두가지 NETWORK환경을 모두 지원 해야 한다. LAN카드는 TCP/IP프로토콜을 지원할 것이며 BSC카드는 모뎀을 통해서 BSC 프로토콜을 지원할 것이다. 시스템은 산업용 PC보다 성능이 뛰어난 Unix시스템을 사용할것이다. G/W시스템의 역할은 각기 형태가 다른 전문을 재편성 하는 기능을 추가한다. 상위(HOST)시스템으로 부터 받는 지시 데이터의 SIZE를 하위(P/C)시스템에서 적용 가능한 수준으로 재조정 되어야 한다. 반대로 하위(P/C)시스템에서 송신되는 전문 형태를 상위(HOST)시스템에 맞게 재조정 되어야 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2009.05a
• /
• pp.76-79
• /
• 2009

Recently there has been much effort, in both academia and industry, to integrate a plethora of wireless technologies in order to provide seamless connection to mobile users. To support seamless connection on terminal needs fast handover function and location management function. Especially, Performing fast handover has to interact with function of datalink layer and mobility based IP. In this paper, we propose a handover decision mechanism using MIH( Media Independent Handover) in hybrid networks to reduce the delay of transmission for data.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2013.11a
• /
• pp.329-332
• /
• 2013

본 논문에서는 매크로기지국과 펨토기지국의 간섭을 회피하는 방법인 자원대체 간섭회피기법을 제안한다. 이 기법은 펨토셀 영역의 여유로운 자원을 할당받은 후에, 이기종망 간의 발생할 수 있는 충돌을 미리 검사하고 충돌이 예상되면 충돌가능자원을 회피하고 여유로운 자원으로 대체하여 통신을 한다. 본 기법을 적용하면 하향링크 및 상향링크에서 이기종망 간의 직교주파수를 적용하면서 발생할 수 있는 지연을 최소화 할 수가 있으며, 이기종망 간에서 주파수를 분할하여 통신을 하는 SFR 기법과 비교하여, 자원의 효율성을 높일 수가 있다.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.22 no.3
• /
• pp.369-381
• /
• 2019

As tactical networks are gradually shifting toward IP-based flexible operation for diversified battlefield services, QoS(Quality-of-Service) coordination for service differentiation becomes essential to overcome the heterogeneous and scarce networking resources limitations. QoS coordination for tactical network traffic should be able to monitor and react the dynamic changes in underlying network topology and service priorities. In this paper, by adopting the emerging cloud-native service mesh concept into tactical network context, we study the feasibility of intelligent QoS coordination by employing tactical service mesh(TSM) as an additional layer to support enhanced traffic quality monitoring and control. The additional TSM layer can leverage distributed service-mesh proxies at tactical mesh WAN(Wide Area Network) nodes so that service-aware differentiated QoS coordination can be effectively designed and integrated with TSM-assisted traffic monitoring and control. Also, by validating the feasibility of TSM layer for QoS coordination with miniaturized experimental setup, we show the potential of the proposed approach with several approximated battlefield traffics over a simulated TSM-enabled tactical network.

• Journal of Broadcast Engineering
• /
• v.25 no.4
• /
• pp.560-568
• /
• 2020

In recent years, as network technology develops, the usage of streaming services by users is increasing. However, the complexity of streaming services is also increasing due to various terminal environments. Even when streaming the same content, it is necessary to re-encode the content according to the type of service. In order to solve the complexity and latency of the streaming service, Moving Picture Experts Group (MPEG) has standardized the Common Media Application Format (CMAF). In addition, as content transmission using a communication network becomes possible, the Republic of Korea's Ultra High Definition (UHD) broadcasting standard has been enacted as a hybrid standard using a broadcasting network and a communication network. The hybrid service enables various services such as transmitting additional information of contents or providing user-customized contents through a communication network. The Republic of Korea's UHD transmission standard utilizes MPEG Media Transport (MMT), and Mobile MMT is an extension of MMT to provide mobile network-specific functions. This paper proposes a method of inserting CMAF contents suitable for various streaming services using signaling messages of MMT and Mobile MMT. In addition, this paper proposes a model for content insertion system in heterogeneous network environment using broadcasting and communication networks, and verifies the validity of the proposed technology by checking the result of content insertion.

• Journal of Intelligence and Information Systems
• /
• v.14 no.4
• /
• pp.19-30
• /
• 2008

Semantic heterogeneity should be overcome to support automated information sharing process between information systems in ontology-based distributed environments. To do so, traditional approaches have been based on explicit mapping between ontologies from human experts of the domain. However, the manual tasks are very expensive, so that it is difficult to obtain ontology mappings between all possible pairs of information systems. Thereby, in this paper, we propose a system to make the existing mapping information sharable and exchangeable. It means that the proposed system can collect the existing mapping information and aggregate them. Consequently, we can estimate the ontology mappings in an indirect manner. In particular, this paper focuses on query propagation on the distributed networks. Once we have the indirect mapping between systems, the queries can be efficiently transformed to automatically exchange knowledge between heterogeneous information systems.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.25 no.8A
• /
• pp.1085-1095
• /
• 2000

In this paper, we have defined the rules and the algorithm for diagnosis and recovery of routing configuration fault on a system. By using them, we have implemented the Java-based system that can manage routing configuration fault automatically. To manage routing configuration fault, the production rule for network configuration management, the production rule for routing configuration fault diagnosis, and the production rule for routing configuration fault recovery have been proposed. Rule-based routing configuration fault management system has been implemented on the basis of backward chaining algorithm and applied for meta rules for the purpose of interconnecting the production rules. We have derived the experimental result from transition process of the rules, the Blackboard, the goals based on scenarios. Through the implementation of dynamically applicable system in heterogeneous and rapidly changing network environments, we have proposed the methodology for network configuration fault management. Also, we expect that network configuration manager can reduce time and cost wasted for routing configuration fault management.

• KIPS Transactions on Software and Data Engineering
• /
• v.5 no.5
• /
• pp.221-230
• /
• 2016

With emerging the Internet of Things (IoT) paradigm, the sensor network and sensor platform technologies have been changed according to exploding amount of sensors. Sensor Registry System (SRS) as a sensor platform is a system that registers and manages sensor metadata for consistent semantic interpretation in heterogeneous sensor networks. However, the SRS is unsuitable for the IoT environment. Therefore, this paper proposes sensor registry data model to register and manager sensor information in the IoT environment. We analyze Semantic Sensor Network Ontology (SSNO) for improving the existed SRS, and design metamodel based on the analysis result. We also build tables in a relational database using the designed metamodel, then implement SRS as a web application. This paper applies the SSNO and sensor ontology examples with translating into the proposed model in order to verify the suitability of the proposed sensor registry data model. As the evaluation result, the proposed model shows abundant expression of semantics by comparison with existed models.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.24 no.6B
• /
• pp.1113-1122
• /
• 1999

In this paper, we propose MSS(Multicast Synchronization Server) and QCS(QoS Conversion Server) models that can support IP multicast and QoS(Quality of Service) over the ATM network more efficiently. In the MSS model, it is possible to establish shortcut VCs(Virtual Circuits) among all hosts in the ATM network and to transfer multicast data at high speed. Also the MSS model is more scalable, because the number of inter-cluster VCs needed in the MSS model is less than that of EARTH. In the QCS model, ATM switch is modified to support one QoS service and best effort service through the one point-to-multipoint VC at the same time so required network resources are reduced, and dedicated server is used for QoS conversion to accept heterogeneous receivers more efficiently. In this Paper, the proposed MSS model and QCS model have solved both efficiency problem and scalability problem. It is proved through the comparison of the VCs required in each model.